LEVELS OF BLyS/APRIL HETEROTRIMERS IN SERUM AND USE IN DIAGNOSTIC METHODS

Abstract

vides a method of measuring the levels of BLyS/APRIL heterotrimers (HT) in a biological sample, in a preferred embodiment, in serum. The diagnostic assays are useful in predicting an individual's likelihood of developing or currently suffering from an autoimmune disease, such as SLE and for methods for treating an individual clinically diagnosed with an autoimmune disease. This diagnostic test serves to predict a patient's likelihood to respond to a specific drug treatment, in particular treatment with HT antagonists, either singly or in combination with other immune suppressive drugs.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001]This application claims the benefit of U.S. Provisional Application No. 61/049,706, filed May 1, 2008 which are herein incorporated by reference in its entirety.

REFERENCE TO A SEQUENCE LISTING SUBMITTED AS A TEXT FILE VIA EFS-WEB

[0002]The official copy of the sequence listing is submitted concurrently with the specification as a text file via EFS-Web, in compliance with the American Standard Code for Information Interchange (ASCII), with a file name of 371297SEQLIST.txt, a creation date of Apr. 13, 2009, and a size of 68 KB. The sequence listing filed via EFS-Web is part of the specification and is hereby incorporated in its entirety by reference herein.

BACKGROUND OF THE INVENTION

[0003]Cellular interactions which occur during an immune response are regulated by members of several families of cell surface receptors, including the tumor necrosis factor receptor (TNFR) family. The TNFR family consists of a number of integral membrane glycoprotein receptors many of which, in conjunction with their respective ligands, regulate interactions between different hematopoietic cell lineages (Smith et al., The TNF Receptor Superfamily of Cellular and Viral Proteins: Activation Costimulation and Death, 76:959-62, 1994; Cosman, Stem Cells 12:440-55, 1994). Three receptor members of this family are (1) BCMA, B Cell Maturation Antigen (Gras et al., Int. Immunol. 17:1093-106, 1995 and Hatzoglou et al., J. Immunol., 165: 1322-30, 2000); (2) TACI, transmembrane activator and CAML-interactor (von Bulow and Bram, Science 228:138-41, 1997 and WIPO Publication WO 98/39361)) and (3) BAFF-R, also known as BLyS/BLyS receptor 3 (BR3), (Thompson et al., Science, 293: 2108-11, 2001). These receptors are known to bind one or both TNF ligands--B Lymphocyte stimulator (BLyS also known as BLyS, TALL-1, ztnf4 and THANK) (see, e.g., Shu et al., J. Leukoc. Biol. 65: 680-683 (1999)) and a proliferation-inducing ligand (APRIL) (see, e.g., Hahne et al., J. Exp. Med. 188: 1185-1190 (1998)). Specifically, TACI and BCMA are known to bind both BLyS and APRIL and BAFF-R binds only BLyS.

[0004]A number of BLyS and/or APRIL antagonists have been developed in order to block the binding of the ligands to the receptor members of the family, in order to block results of this binding which include but should not be limited to B cell co-stimulation, plasmablast and plasma cell survival, Ig class switching, enhanced B-cell antigen presenting cell function, survival of malignant B cells, development of B-1 cell function, B cell development beyond the T-1 stage, and complete germinal centre formation. Some of these molecules can also bind to and block the effect of APRIL on B cells and other components of the immune system (Dillon et al. (2006) Nat. Rev. Drug Dis. 5, 235-246). Molecules that have been developed to affect B cell function by interfering with BLyS and/or APRIL binding include BLyS antibodies such as Lymphostat-B (Belimumab) (Baker et al, (2003) Arthritis Rheum, 48, 3253-3265 and WO 02/02641); receptor-extracellular domain/Fc domain fusions proteins such as TACI-Ig, including one particular embodiment, atacicept (U.S. Patent Application No. 20060034852), BAFF-R-Fc (WO 05/0000351), and BCMA-Ig or other fusion proteins utilizing receptor extracellular domains. A further class of BLyS and/or APRIL antagonists include other molecules relying on BLyS binding ability to block binding to its receptors such as AMG 623, receptor antibodies, and other molecules disclosed in WO 03/035846 and WO 02/16312.

[0005]One understudied aspect of this ligand/receptor family is the fact that these ligands appear to exist in vivo not only as homotrimers (which would be expected for TNF family ligands), but also as BLyS/APRIL heterotrimers (HT) of uncharacterized stoichiometry.

[0006]Using an extremely small and heterogenous sample set (i.e., 15 patients with 6 different autoimmune disease diagnosies between them), the existence of elevated HT in sera as compared to healthy controls was reported by Roschke et al. (J. Immunol. 169:4314-4321, 2002). However, there has been no association of the presence of elevated HT with any particular autoimmune disease, an analysis necessary to apply such findings to specific disease treatment methods nor has this finding been presented beyond anecdotally, i.e., with statistical significance.

[0007]Thus, there remains a need in the art for investigation into the biological activity of HT and the development of an assay to compare the levels of native HT to those of homotrimeric BLyS and APRIL in autoimmune patients. Furthermore, this assay allows identification of expression patterns of HT so that statistical associations with autoimmune disease can be identified, such as systemic lupus erythematosus (SLE). Such information is important for identifying individuals who have a propensity toward developing such autoimmune diseases, are in an active disease state, and for identifying those that will respond favorably to BLyS and/or APRIL antagonist treatment of these diseases. The present invention addresses this need by providing HT levels associated with autoimmune diseases and providing diagnostic tests determining the presence of this expression pattern, namely increased HT levels in serum for those suffering from autoimmune disease such as SLE as compared to levels seen in healthy controls.

SUMMARY OF THE INVENTION

[0008]The present invention provides a method of screening for levels of HT in serum and in other biological samples. As it has been shown that elevated levels of HT are significantly associated with autoimmune disease, such as RA, this measurement is useful as a diagnostic assay. Such diagnostic assays are useful in predicting an individual's likelihood of having a condition associated with autoimmune activity, such as SLE. The invention further provides methods for determining an appropriate treatment for an individual with an autoimmune disease, such as SLE.

[0009]Detection of high levels of HT in the serum of patients exhibiting autoimmune activity, such as SLE, allows selection of a treatment plan that is most likely to be effective in treating the condition. These treatment plans generally involve the use of BLyS and/or APRIL antagonists, either singly or in combination with another pharmaceutical such as an immune suppressive drug (like MMF or Cellcept®) or a CD 20 antagonist (like Rituxan®)

[0010]Thus, the invention further provides methods for treating an individual newly clinically diagnosed with an autoimmune condition, generally comprising detecting high levels of HT in the serum, as compared to levels seen in the serum of healthy controls, and selecting a treatment plan that is most effective for individuals clinically diagnosed with an autoimmune disease. Detection of high levels of HT in the serum also allows one to predict a patient's likelihood to respond to a specific drug treatment, particularly BLyS and/or APRIL antagonists. Thus, the invention further provides methods of predicting a patient's likelihood to respond to BLyS and/or APRIL antagonists (either singly or in combination with other drugs) during treatment for an autoimmune condition, such as SLE.

[0011]Very specifically, the present invention describes a method of detecting increased HT levels in the serum of an individual comprising measuring a first level of HT protein levels in a biological sample and comparing that level to a second level of HT protein levels present in a biological sample of a healthy individual and determining the first level is increased as compared to the second level, wherein said increased HT protein levels is associated with an autoimmune disease. The autoimmune disease in the present invention can be selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis. In particular, the autoimmune disease is SLE.

[0012]The present invention also describes a method of treating an individual clinically diagnosed with an autoimmune disease, comprising analyzing a biological sample from an individual clinically diagnosed with autoimmune disease for the presence or absence of elevated HT levels in serum, wherein the presence of elevated HT levels is associated with the clinical diagnosis of autoimmune disease; and selecting a treatment plan that is most effective for individuals clinically diagnosed as having a condition associated with an increased HT levels. The treatment plan can involve administration of a BLyS antagonist. And, in a preferred embodiment said BLyS antagonist can also be an APRIL antagonist. In particular, the treatment plan should involve the administration of a HT antagonist. For this method the autoimmune disease can be selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis. In particular, the autoimmune disease is SLE.

[0013]Furthermore, the present invention describes methods for predicting a patient's likelihood to respond to a drug treatment for an autoimmune disease, comprising determining the level of HT levels in the serum, wherein the presence of elevated HT levels is predictive of the patient's likelihood to respond to a drug treatment for the condition. The autoimmune disease can be selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis. In particular, the autoimmune disease is SLE. Additionally, the present invention method can include a drug treatment involves administration of a HT antagonist, which can also be a BLyS and/or APRIL antagonist.

[0014]The present invention also encompasses an in vitro method of detecting increased HT levels in the serum of an individual, comprising measuring the level of HT levels in a test biological sample from the individual; comparing that level to the level of HT levels in a biological sample from a healthy control; and determining whether the level of HT levels in the test biological sample is increased as compared to the level in the control sample; wherein said increased HT levels is associated with an autoimmune disease. The autoimmune disease in this method can be selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis. In particular, the autoimmune disease is SLE.

[0015]In a further embodiment, the present invention includes an in vitro method of selecting a treatment plan that is most effective for treating an individual clinically diagnosed with an autoimmune disease, comprising analyzing in vitro a biological sample from an individual clinically diagnosed with autoimmune disease for the presence or absence of elevated HT levels in their serum, wherein the presence of elevated HT levels is associated with the clinical diagnosis of autoimmune disease. For this method, the treatment plan can involves the use of a HT antagonist and the HT antagonist can also be a BLyS and/or APRIL antagonist. The autoimmune disease can be selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis. In particular, the autoimmune disease is SLE.

[0016]In a still further embodiment, the present invention includes an in vitro method for predicting a patient's likelihood to respond to a drug treatment for an autoimmune disease, comprising determining the level of HT levels in a sample from the patient; wherein the presence of elevated HT levels is predictive of the patient's likelihood to respond to a drug treatment for the condition. The autoimmune disease can be selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis. In particular, the autoimmune disease is SLE. The drug treatment of the present invention can comprise a HT antagonist and said HT antagonist can also be a BLyS and/or APRIL antagonist.

[0017]Finally, the present invention contemplates a BLys antagonist for use in the treatment of an autoimmune disease in a patient, wherein said patient has elevated levels of HT levels in the serum. The antagonist can also be a receptor-extracellular domain/Fc domain fusion protein selected from TACI-Ig and BCMA-Ig. In particular, the receptor-extracellular domain/Fc domain fusion protein can be TACI-Ig, such as atacicept.

[0018]These and other aspects of the invention will become apparent to those persons skilled the art upon reading the details of the invention as more fully described below.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019]FIG. 1. is a scatter graph of the heterotrimer levels for a cohort of patients diagnosed with SLE or RA as well as healthy controls.

[0020]FIG. 2 expresses the data of FIG. 1 showing average heterotrimer levels.

[0021]FIG. 3 graphs the heterotrimer levels of a second cohort of SLE patients.

BRIEF DESCRIPTION OF THE INVENTION

[0022]The present invention provides a method for screening HT levels in biological samples, such as serum and the use of this information for predicting the presence of autoimmune disease and predicting the likelihood that a patient would respond to HT antagonist treatment. The invention is based on the finding that the levels of HT levels in the serum of autoimmune patients is statistically elevated. HT antagonists (which may also be BLyS and/or APRIL antagonists) selectively neutralize the production of autoimmune immunoglobulin and other tissue destructive cytokines by the immune cells, such as B cells, of said patients. This observation allows development of diagnostic assays to detect the presence of increased HT levels where these higher levels are associated with autoimmune disease, such as SLE, and also may predict the likelihood that an individual will successfully respond to treatment methods that neutralize the action of reactive immune cells, such as B cells, i.e., HT antagonists (BLyS and/or APRIL antagonists).

[0023]Before the present invention is described, it is to be understood that this invention is not limited to particular embodiments described, as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting, since the scope of the present invention will be limited only by the appended claims.

[0024]Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods and materials are now described. All publications mentioned herein are incorporated herein by reference to disclose and describe the methods and/or materials in connection with which the publications are cited.

[0025]It must be noted that as used herein and in the appended claims, the singular forms "a", "and", and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a polymorphism includes a plurality of such polymorphisms, reference to "a nucleic acid molecule" includes a plurality of such nucleic acid molecules, and reference to "the method" includes reference to one or more methods, method steps, and equivalents thereof known to those skilled in the art, and so forth.

[0026]The publications discussed herein are provided solely for their disclosure prior to the filing date of the present application. Nothing herein is to be construed as an admission that the present invention is not entitled to antedate such publication by virtue of prior invention. Further, the dates of publication provided may be different from the actual publication dates which may need to be independently confirmed.

DEFINITIONS

[0027]The term heterotrimer (HT), as used herein encompasses multimers of three ligand subunits, where each ligand subunit is either BLyS or APRIL and at least one subunit is BLyS and at least one subunit is APRIL. Thus, "HT" includes those molecules that are 2 BLyS and one APRIL, as well as those that are 2 APRIL and one BLyS.

[0028]The term "polymorphism", as used herein, refers to a difference in the nucleotide or amino acid sequence of a given region as compared to a nucleotide or amino acid sequence in a homologous-region of another individual, in particular, a difference in the nucleotide of amino acid sequence of a given region which differs between individuals of the same species. A polymorphism is generally defined in relation to a reference sequence. Polymorphisms include single nucleotide differences, differences in sequence of more than one nucleotide, and single or multiple nucleotide insertions, inversions and deletions; as well as single amino acid differences, differences in sequence of more than one amino acid, and single or multiple amino acid insertions, inversions, and deletions.

[0029]The terms "polynucleotide" and "nucleic acid molecule" are used interchangeably herein to refer to polymeric forms of nucleotides of any length. The polynucleotides may contain deoxyribonucleotides, ribonucleotides, and/or their analogs. Nucleotides may have any three-dimensional structure, and may perform any function, known or unknown. The term "polynucleotide" includes single-, double-stranded and triple helical molecules. "Oligonucleotide" generally refers to polynucleotides of between about 5 and about 100 nucleotides of single- or double-stranded DNA. However, for the purposes of this disclosure, there is no upper limit to the length of an oligonucleotide. Oligonucleotides are also known as oligomers or oligos and may be isolated from genes, or chemically synthesized by methods known in the art.

[0030]The following are non-limiting embodiments of polynucleotides: a gene or gene fragment, exons, introns, mRNA, tRNA, rRNA, ribozymes, cDNA, recombinant polynucleotides, branched polynucleotides, plasmids, vectors, isolated DNA of any sequence, isolated RNA of any sequence, nucleic acid probes, and primers. A nucleic acid molecule may also comprise modified nucleic acid molecules, such as methylated nucleic acid molecules and nucleic acid molecule analogs. Analogs of purines and pyrimidines are known in the art. Nucleic acids may be naturally occurring, e.g. DNA or RNA, or may be synthetic analogs, as known in the art. Such analogs may be preferred for use as probes because of superior stability under assay conditions. Modifications in the native structure, including alterations in the backbone, sugars or heterocyclic bases, have been shown to increase intracellular stability and binding affinity. Among useful changes in the backbone chemistry are phosphorothioates; phosphorodithioates, where both of the non-bridging oxygens are substituted with sulfur; phosphoroamidites; alkyl phosphotriesters and boranophosphates. Achiral phosphate derivatives include 3'-O'-5'-S-phosphorothioate, 3'-S-5'-O-phosphorothioate, 3'-CH2-5'-O-phosphonate and 3'-NH-5'-O-phosphoroamidate. Peptide nucleic acids replace the entire ribose phosphodiester backbone with a peptide linkage.

[0031]Sugar modifications are also used to enhance stability and affinity. The α-anomer of deoxyribose may be used, where the base is inverted with respect to the natural β-anomer. The 2'-OH of the ribose sugar may be altered to form 2'-O-methyl or 2'-O-allyl sugars, which provides resistance to degradation without comprising affinity.

[0032]Modification of the heterocyclic bases must maintain proper base pairing. Some useful substitutions include deoxyuridine for deoxythymidine; 5-methyl-2'-deoxycytidine and 5-bromo-2'-deoxycytidine for deoxycytidine. 5-propynyl-2'-deoxyuridine and 5-propynyl-2'-deoxycytidine have been shown to increase affinity and biological activity when substituted for deoxythymidine and deoxycytidine, respectively.

[0033]The terms "polypeptide" and "protein", used interchangebly herein, refer to a polymeric form of amino acids of any length, which can include coded and non-coded amino acids, chemically or biochemically modified or derivatized amino acids, and polypeptides having modified peptide backbones. The term includes fusion proteins, including, but not limited to, fusion proteins with a heterologous amino acid sequence, fusions with heterologous and homologous leader sequences, with or without N-terminal methionine residues; immunologically tagged proteins; and the like.

[0034]In the broadest sense, as used herein, the terms "autoimmune disease," refer to a disease wherein a patient's immune system is producing an unwanted immune response to one or more of their own proteins. Representative examples of autoimmune diseases include rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis.

[0035]A "substantially isolated" or "isolated" polynucleotide is one that is substantially free of the sequences with which it is associated in nature. By substantially free is meant at least 50%, preferably at least 70%, more preferably at least 80%, and even more preferably at least 90% free of the materials with which it is associated in nature. As used herein, an "isolated" polynucleotide also refers to recombinant polynucleotides, which, by virtue of origin or manipulation: (1) are not associated with all or a portion of a polynucleotide with which it is associated in nature, (2) are linked to a polynucleotide other than that to which it is linked in nature, or (3) does not occur in nature.

[0036]Hybridization reactions can be performed under conditions of different "stringency". Conditions that increase stringency of a hybridization reaction of widely known and published in the art. See, for example, Sambrook et al. (1989). Examples of relevant conditions include (in order of increasing stringency): incubation temperatures of 25° C., 37° C., 50° C. and 68° C.; buffer concentrations of 10×SSC, 6×SSC, 1×SSC, 0.1×SSC (where SSC is 0.15 M NaCl and 15 mM citrate buffer) and their equivalents using other buffer systems; formamide concentrations of 0%, 25%, 50%, and 75%; incubation times from 5 minutes to 24 hours; 1, 2, or more washing steps; wash incubation times of 1, 2, or 15 minutes; and wash solutions of 6×SSC, 1×SSC, 0.1×SSC, or deionized water. Examples of stringent conditions are hybridization and washing at 50° C. or higher and in 0.1×SSC (9 mM NaCl/0.9 mM sodium citrate).

[0037]"T_m" is the temperature in degrees Celsius at which 50% of a polynucleotide duplex made of complementary strands hydrogen bonded in anti-parallel direction by Watson-Crick base pairing dissociates into single strands under conditions of the experiment. T_m may be predicted according to a standard formula, such as: where [X.sup.+] is the cation concentration (usually sodium ion, Na.sup.+) in mol/L; (% G/C) is the number of G and C residues as a percentage of total residues in the duplex; (% F) is the percent formamide in solution (wt/vol); and L is the number of nucleotides in each strand of the duplex.

[0038]Stringent conditions for both DNA/DNA and DNA/RNA hybridization are as described by Sambrook et al. Molecular Cloning, A Laboratory Manual, 2nd Ed., Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y., 1989, herein incorporated by reference. For example, see page 7.52 of Sambrook et al.

[0039]The term "host cell" includes an individual cell or cell culture which can be or has been a recipient of any recombinant vector(s) or isolated polynucleotide of the invention. Host cells include progeny of a single host cell, and the progeny may not necessarily be completely identical (in morphology or in total DNA complement) to the original parent cell due to natural, accidental, or deliberate mutation and/or change. A host cell includes cells tranfected or infected in vivo or in vitro with a recombinant vector or a polynucleotide of the invention. A host cell which comprises a recombinant vector of the invention is a "recombinant host cell".

[0040]The term "binds specifically," in the context of antibody binding, refers to high avidity and/or high affinity binding of an antibody to a specific polypeptide i.e., epitope of a polymorphic APRIL or BLyS polypeptide. Antibody binding to an epitope on a specific APRIL or BLyS polypeptide is preferably stronger than binding of the same antibody to any other epitope, particularly those which may be present in molecules in association with, or in the same sample, as the specific polypeptide of interest, e.g., binds more strongly to a specific APRIL or BLyS epitope than to a different APRIL or BLyS epitope so that by adjusting binding conditions the antibody binds almost exclusively to the specific APRIL or BLyS epitope and not to any other APRIL or BLyS epitope. Antibodies which bind specifically to a polypeptide of interest may be capable of binding other polypeptides at a weak, yet detectable, level (e.g., 10% or less of the binding shown to the polypeptide of interest). Such weak binding, or background binding, is readily discernible from the specific antibody binding to the compound or polypeptide of interest, e.g. by use of appropriate controls. In general, antibodies of the invention which bind to a specific APRIL or BLyS polypeptide with a binding affinity of 10⁷ mole/l or more, preferably 10⁸ mole/l or more are said to bind specifically to the specific APRIL or BLyS polypeptide. In general, an antibody with a binding affinity of 10⁶ mole/liters or less is not useful in that it will not bind an antigen at a detectable level using conventional methodology currently used.

[0041]The term "monoclonal antibody" as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical except for possible naturally occurring mutations that can be present in minor amounts.

[0042]Monoclonal antibodies are highly specific, being directed against a single antigenic site. Furthermore, in contrast to conventional (polyclonal) antibody preparations which typically include different antibodies directed against different determinants (epitopes), each monoclonal antibody is directed against a single determinant on the antigen. In addition to their specificity, the monoclonal antibodies are advantageous in that they are synthesized by the hybridoma culture, uncontaminated by other immunoglobulins. The modifier "monoclonal" indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method. For example, the monoclonal antibodies to be used in accordance with the present invention may be made by the hybridoma method first described by Kohler et al., Nature, 256: 495 (1975), or may be made by recombinant DNA methods (see, e.g., U.S. Pat. No. 4,816,567). The "monoclonal antibodies" may also be isolated from phage antibody libraries using the techniques described in Clackson et al., Nature, 352: 624-628 (1991) and Marks et al., J. Mol. Biol., 222: 581-597 (1991), for example.

[0043]The monoclonal antibodies herein specifically include "chimeric" antibodies (immunoglobulins) in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain (s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (U.S. Pat. No. 4,816,567; Morrison et al., Proc. Natl. Acad. Sci. USA, 81: 6851-6855 (1984)). Methods of making chimeric antibodies are known in the art.

[0044]"Humanized" forms of non-human (e.g., murine) antibodies are chimeric immunoglobulins, immunoglobulin chains or fragments thereof (such as Fv, Fab, Fab', F (ab') 2 or other antigen-binding subsequences of antibodies) which contain minimal sequence derived from non-human immunoglobulin.

[0045]For the most part, humanized antibodies are human immunoglobulins (recipient antibody) in which residues from a complementarity-determining region (CDR) of the recipient are replaced by residues from a CDR of a non-human species (donor antibody) such as mouse, rat or rabbit having the desired specificity, affinity, and capacity. In some instances, Fv framework region (FR) residues of the human immunoglobulin are replaced by corresponding non-human residues. Furthermore, humanized antibodies may comprise residues which are found neither in the recipient antibody nor in the imported CDR or framework sequences. These modifications are made to further refine and maximize antibody performance. In general, the humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the hypervariable loops correspond to those of a non-human immunoglobulin and all or substantially all of the FR regions are those of a human immunoglobulin sequence although the FR regions may include one or more amino acid substitutions that improve binding affinity. The number of these amino acid substitutions in the FR are typically no more than 6 in the H chain, and in the L chain, no more than 3. The humanized antibody optimally also will comprise at least a portion of an immunoglobulin constant region (Fc), typically that of a human immunoglobulin. For further details, see Jones et al., Nature, 321: 522-525 (1986); Reichmann et al., Nature, 332: 323-329 (1988); and Presta, Curr. Op. Struct. Biol., 2: 593-596 (1992). The humanized antibody includes a PRIMATIZED antibody wherein the antigen-binding region of the antibody is derived from an antibody produced by, e.g., immunizing macaque monkeys with the antigen of interest. Methods of making humanized antibodies are known in the art.

[0046]Human antibodies can also be produced using various techniques known in the art, including phage-display libraries. Hoogenboom and Winter, J. Mol. Biol., 227: 381 (1991); Marks et al., J. Mol. Biol., 222: 581 (1991). The techniques of Cole et al. and Boerner et al. are also available for the preparation of human monoclonal antibodies. Cole et al., Monoclonal Antibodies and Cancer Therapy, Alan R. Liss, p. 77 (1985); Boerner et al., J. Immunol., 147(1): 86-95 (1991).

[0047]"Functional fragments" of the binding antibodies of the invention are those fragments that retain binding to BLyS, TACI, BAFF-R, or BCMA with substantially the same affinity as the intact full chain molecule from which they are derived and may be able to deplete B cells as measured by in vitro or in vivo assays such as those described herein.

[0048]Antibody "effector functions" refer to those biological activities attributable to the Fc region (a native sequence Fc region or amino acid sequence variant Fc region) of an antibody, and vary with the antibody isotype. Examples of antibody effector functions include: Clq binding and complement dependent cytotoxicity; Fc receptor binding; antibody-dependent cell-mediated cytotoxicity (ADCC); phagocytosis; down regulation of cell surface receptors (e.g. B cell receptor); and B cell activation.

[0049]"Antibody-dependent cell-mediated cytotoxicity" or "ADCC" refers to a form of cytotoxicity in which secreted Ig bound onto Fc receptors (FcRs) present on certain cytotoxic cells (e.g. Natural Killer (NK) cells, neutrophils, and macrophages) enable these cytotoxic effector cells to bind specifically to an antigen-bearing-target cell and subsequently kill the-target cell with cytotoxins. The antibodies-"arm" the cytotoxic cells and are absolutely required for such killing. The primary cells for mediating ADCC, NK cells, express FcyRIII only, whereas monocytes express FcyRI, FcyRII and FcyRIII. FcR expression on hematopoietic cells is summarized in Table 3 on page 464 of Ravetch and Kinet, Ann. Rev. Immunol 9: 457-92 (1991). To assess ADCC activity of a molecule of interest, an in vitro ADCC assay, such as that described in U.S. Pat. No. 5,500,362 or 5,821,337 may be performed. Useful effector cells for such assays include peripheral blood mononuclear cells (PBMC) and Natural Killer (NK) cells. Alternatively, or additionally, ADCC activity of the molecule of interest may be assessed in vivo, e.g., in a animal model such as that disclosed in Clynes et al. PNAS (USA) 95: 652-656 (1998).

[0050]"Complement dependent cytotoxicity" or "CDC" refers to the lysis of a target cell in the presence of complement. Activation of the classical complement pathway is initiated by the binding of the first component of the complement system (Clq) to antibodies (of the appropriate subclass) which are bound to their cognate antigen. To assess complement activation, a CDC assay, e.g. as described in Gazzano-Santoro et al., J. Immunol. Methods 202: 163 (1996), may be performed.

[0051]An "isolated" antibody is one which has been identified and separated and/or recovered from a component of its natural environment. Contaminant components of its natural environment are materials which would interfere with diagnostic or therapeutic uses for the antibody, and may include enzymes, hormones, and other proteinaceous or nonproteinaceous solutes. In preferred embodiments, the antibody will be purified (1) to greater than 95% by weight of antibody as determined by the Lowry method, and most preferably more than 99% by weight, (2) to a degree sufficient to obtain at least 15 residues of N-terminal or internal amino acid sequence by use of a spinning cup sequenator, or (3) to homogeneity by SDS-PAGE under reducing or nonreducing conditions using Coomassie blue or, preferably, silver stain.

[0052]Isolated antibody includes the antibody in situ within recombinant cells since at least one component of the antibody's natural environment will not be present. Ordinarily, however, isolated antibody will be prepared by at least one purification step.

[0053]The terms "detectably labeled antibody" refers to an antibody (or antibody fragment which retains binding specificity for a APRIL polypeptide or epitope), having an attached detectable label. The detectable label is normally attached by-chemical conjugation, but where the label is a polypeptide, it could alternatively be attached by genetic engineering techniques. Methods for production of detectably labeled proteins are well known in the art. Detectable labels may be selected from a variety of such labels known in the art, including, but not limited to, radioisotopes, fluorophores, paramagnetic labels, enzymes (e.g., horseradish peroxidase), or other moieties or compounds which either emit a detectable signal (e.g., radioactivity, fluorescence, color) or emit a detectable signal after exposure of the label to its substrate. Various detectable label/substrate pairs (e.g., horseradish peroxidase/diaminobenzidine, avidin/streptavidin, luciferase/luciferin)), methods for labeling antibodies, and methods for using labeled antibodies are well known in the art (see, for example, Harlow and Lane, eds. (Antibodies: A Laboratory Manual (1988) Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y.)).

[0054]A "biological sample" encompasses a variety of sample types obtained from an individual and can be used in a diagnostic or monitoring assay. The definition encompasses blood and other liquid samples of biological origin, solid tissue samples such as a biopsy specimen or tissue cultures or cells derived there from and the progeny thereof. The definition also includes samples that have been manipulated in any way after their procurement, such as by treatment with reagents, solubilization, or enrichment for certain components, such as polynucleotides. The term "biological sample" encompasses a clinical sample, and also includes cells in culture, cell supernatants, cell lysates, serum, plasma, biological fluid, and tissue samples.

[0055]As used herein, the terms "treatment", "treating", and the like, refer to obtaining a desired pharmacologic and/or physiologic effect. The effect may be prophylactic in terms of completely or partially preventing a disease or symptom thereof and/or may be therapeutic in terms of a partial or complete cure for a disease and/or adverse affect attributable to the disease. "Treatment", as used herein, covers any treatment of a disease in a mammal, particularly in a human, and includes: (a) preventing the disease from occurring in a subject which may be predisposed to the disease but has not yet been diagnosed as having it; (b) inhibiting the disease, i.e., arresting its development; and (c) relieving the disease, i.e., causing regression of the disease.

[0056]"Immunosuppressive drugs" are any molecules that interfere with the immune system and blunt its response to foreign or self antigens. Cyclophosphamide (CYC) and mycophenolate mofetil (MMF) are two such kinds of molecules. This term is intended to encompass any drug or molecule useful as a therapeutic agent in downregulating the immune system.

[0057]A "fusion protein" and a "fusion polypeptide" refer to a polypeptide having two portions covalently linked together, where each of the portions is a polypeptide having a different property. The property may be a biological property, such as activity in vitro or in vivo. The property may also be a simple chemical or physical property, such as binding to a target molecule, catalysis of a reaction, etc. The two portions may be linked directly by a single peptide bond or through a peptide linker containing one or more amino acid residues. Generally, the two portions and the linker will be in reading frame with each other.

[0058]A "conjugate" refers to any hybrid molecule, including fusion proteins and as well as molecules that contain both amino acid or protein portions and non-protein portions. Conjugates may be synthesized by a variety of techniques known in the art including, for example, recombinant DNA techniques, solid phase synthesis, solution phase synthesis, organic chemical synthetic techniques or a combination of these techniques. The choice of synthesis will depend upon the particular molecule to be generated. For example, a hybrid molecule not entirely "protein" in nature may be synthesized by a combination of recombinant techniques and solution phase techniques.

[0059]As used herein, the term "Fc-fusion protein" designates antibody-like molecules which combine the binding specificity of a heterologous protein with the effector functions of immunoglobulin constant domains. Structurally, the Fc-fusion proteins comprise a fusion of an amino acid sequence with the desired binding specificity which is other than the antigen recognition and binding site of an antibody (i.e., is "heterologous"), and an immunoglobulin constant domain sequence. The Fc-fusion protein molecule typically includes a contiguous amino acid sequence comprising at least the binding site of a receptor or a ligand. The immunoglobulin constant domain sequence in the Fc-fusion protein can be obtained from any immunoglobulin, such as IgG-1, IgG-2, IgG-3, or IgG-4 subtypes, IgA (including IgA-1 and IgA-2), IgE, IgD or IgM. For example, useful Fc-fusion proteins according to this invention are polypeptides that comprise the BLyS binding portions of a BLyS receptor without the transmembrane or cytoplasmic sequences of the BLyS receptor. In one embodiment, the extracellular domain of BAFF-R, TACI or BCMA is fused to a constant domain of an immunoglobulin sequence.

[0060]The terms "individual," "subject," and "patient," used interchangeably herein, refer to a mammal, including, but not limited to, murines, simians, humans, mammalian farm animals, mammalian sport animals, and mammalian pets.

[0061]The term "mammal" refers to any animal classified as a mammal, including humans, domestic and farm animals, and zoo, sports, or pet animals, such as dogs, horses, cats, cows, etc. Preferably, the mammal herein is human.

[0062]Detection of HT (APRIL and BLyS Polypeptides)

[0063]The present invention provides for detection of HT polypeptides through the separate measurement of APRIL and BLyS polypeptides. The term "APRIL polypeptide" encompasses an amino acid sequence encoded by an open reading frame (ORF) of a known APRIL polynucleotide (such as those publicly available, GenBank Accession number AF046888), including the full-length native polypeptide and fragments thereof, particularly biologically active fragments and/or fragments corresponding to functional domains, e.g. a region or domain having biological activity, etc.; antigenic fragments thereof, and including fusions of the subject polypeptides to other proteins or parts thereof. The amino acid sequences of APRIL polypeptides have been disclosed. (See e.g. Hahne et al., J. Exp. Med. 188: 1185-90, 1998). The APRIL polypeptides of the invention can be isolated from a variety of sources, such as from human tissue types or from another source, or prepared by recombinant and/or synthetic methods. A polymorphism in an APRIL polypeptide is generally defined relative to a reference sequence.

[0064]The term "BLyS polypeptide" encompasses an amino acid sequence encoded by an open reading frame (ORF) of a known BLyS polynucleotide (such as those publicly available through GenBank or its complement: Accession No. NM 052945 (human BLyS mRNA) or its human variants Accession Nos. 003808, 172087, 172088 or Accession No. 033622 (mouse BLyS mRNA)), including the full-length native polypeptide and fragments thereof, particularly biologically active fragments and/or fragments corresponding to functional domains, e.g. a region or domain having biological activity, etc.; antigenic fragments thereof, and including fusions of the subject polypeptides to other proteins or parts thereof. The amino acid sequences of BLyS polypeptides have been disclosed. (See e.g. Moore et al. Science 285: 260-3, 1999). The BLyS polypeptides of the invention can be isolated from a variety of sources, such as from human tissue types or from another source, or prepared by recombinant and/or synthetic methods. A polymorphism in a BLyS polypeptide is generally defined relative to a reference sequence.

[0065]As used herein, "polymorphic APRIL polypeptide" refers to an amino acid sequence of a recombinant or non-recombinant polypeptide having an amino acid sequence of i) a native polymorphic APRIL polypeptide, ii) a fragment of a polymorphic APRIL polypeptide, iii) polypeptide analogs of a polymorphic APRIL polypeptide, iv) variants of a polymorphic APRIL polypeptide; v) an immunologically active fragment of a polymorphic APRIL polypeptide; and vi) fusion proteins comprising a polymorphic APRIL polypeptide. Polymorphic APRIL polypeptides of the invention can be obtained from a biological sample, or from any source whether natural, synthetic, semi-synthetic or recombinant.

[0066]As used herein, "polymorphic BLyS polypeptide" refers to an amino acid sequence of a recombinant or non-recombinant polypeptide having an amino acid sequence of i) a native polymorphic BLyS polypeptide, ii) a fragment of a polymorphic BLyS polypeptide, iii) polypeptide analogs of a polymorphic BLyS polypeptide, iv) variants of a polymorphic BLyS polypeptide; v) an immunologically active fragment of a polymorphic BLyS polypeptide; and vi) fusion proteins comprising a polymorphic BLyS polypeptide. Polymorphic BLyS polypeptides of the invention can be obtained from a biological sample, or from any source whether natural, synthetic, semi-synthetic or recombinant.

[0067]The term "BLyS polypeptide" or "APRIL polypeptide" encompasses a polypeptide comprising from at least about 5 amino acids, at least about 10 amino acids, at least about 15 amino acids, at least about 25 amino acids, at least about 50 amino acids, at least about 75 amino acids, at least about 100 amino acids, at least about 200 amino acids, at least about 300 amino acids, at least about 400 amino acids, or up to the entire polypeptide of a polymorphic APRIL or BLyS polypeptide. In some embodiments, a polymorphic APRIL or BLyS polypeptide exhibits biological activity, e.g., the polypeptide causes proliferation of B-cells and production of immunoglobulin in an in vitro assay. Other assays for APRIL or BLyS biological activity are known in the art and can be used to determine whether a polymorphic APRIL or BLyS polypeptide exhibits biological activity and, if desired, to quantitate APRIL or BLyS biological activity. APRIL or BLyS biological assays are described in various publications, e.g. Moore et al., supra.

[0068]APRIL polypeptides can be obtained by any known method, or a combination of such methods, including isolation from natural sources; production by chemical synthesis; and production by standard recombinant techniques. APRIL polypeptides can be isolated from a biological source, using affinity chromatography, e.g., using antibodies specific for a APRIL polypeptide are immobilized on a solid support. The polypeptides may be expressed in prokaryotes or eukaryotes in accordance with conventional ways, depending upon the purpose for expression. For large scale production of the protein, a unicellular organism, such as E. coli, B. subtilis, S. cerevisiae, insect cells in combination with baculovirus vectors, or cells of a higher organism such as vertebrates, particularly mammals, e.g. COS 7 cells, CHO cells, HEK293 cells, and the like, may be used as the expression host cells. In some situations, it is desirable to express the gene in eukaryotic cells, where the protein will benefit from native folding and post-translational modifications. The polypeptide can then be isolated from cell culture supernatant or from cell lysates using affinity chromatography methods or anion exchange/size exclusion chromatography methods, as described above.

[0069]With the availability of the protein or fragments thereof in large amounts, by employing an expression host, the protein may be isolated and purified in accordance with conventional ways. A lysate may be prepared of the expression host and the lysate purified using HPLC, exclusion chromatography, gel electrophoresis, affinity chromatography, or other purification technique. The isolated proteins can be used to produce antibodies, which are in turn, used to detect the presence of that protein using standard assay systems, e.g., ELISA or FACS analysis.

[0070]Preparation of APRIL and BLyS Polypeptides

[0071]In addition to the plurality of uses described in greater detail in following sections, the APRIL nucleic acid compositions are used in the preparation of all or a portion of the APRIL polypeptides, as described above. The polynucleotides (including cDNA or the full-length gene) are used to express a partial or complete gene product. Constructs comprising the subject polynucleotides can be generated synthetically. Alternatively, single-step assembly of a gene and entire plasmid from large numbers of oligodeoxyribonucleotides is described by, e.g., Stemmer et al., Gene (Amsterdam) (1995) 164(1):49-53. In this method, assembly PCR (the synthesis of long DNA sequences from large numbers of oligodeoxyribonucleotides (oligos)) is described. The method is derived from DNA shuffling (Stemmer, Nature (1994) 370:389-391), and does not rely on DNA ligase, but instead relies on DNA polymerase to build increasingly longer DNA fragments during the assembly process. Appropriate polynucleotide constructs are purified using standard recombinant DNA techniques as described in, for example, Sambrook et al., Molecular Cloning: A Laboratory Manual, 2nd Ed., (1989) Cold Spring Harbor Press, Cold Spring Harbor, N.Y., and under current regulations described in United States Dept. of HHS, National Institute of Health (NIH) Guidelines for Recombinant DNA Research.

[0072]In particular it may be necessary to provide engineered means of trimerizing the APRIL protein or the BLyS protein in order to be able to produce sufficient amounts of active protein to produce effective antibodies. Examples of trimerizing polypeptides such as the ZymoZipper sequence are disclosed in U.S. patent application Ser. No. 11/530,672 and the references discussed therein. These types of trimerizing polypeptides are also useful for producing APRIL/BLyS HT standard protein for use in the assay (see Example 1).

[0073]Polynucleotide molecules comprising a polynucleotide sequence provided herein are propagated by placing the molecule in a vector. Viral and non-viral vectors are used, including plasmids. The choice of plasmid will depend on the type of cell in which propagation is desired and the purpose of propagation. Certain vectors are useful for amplifying and making large amounts of the desired DNA sequence. Other vectors are suitable for expression in cells in culture. Still other vectors are suitable for transfer and expression in cells in a whole animal or person. The choice of appropriate vector is well within the skill of the art. Many such vectors are available commercially. The partial or full-length polynucleotide is inserted into a vector typically by means of DNA ligase attachment to a cleaved restriction enzyme site in the vector. Alternatively, the desired nucleotide sequence can be inserted by homologous recombination in vivo. Typically this is accomplished by attaching regions of homology to the vector on the flanks of the desired nucleotide sequence. Regions of homology are added by ligation of oligonucleotides, or by polymerase chain reaction using primers comprising both the region of homology and a portion of the desired nucleotide sequence, for example.

[0074]For expression, an expression cassette or system may be employed. The gene product encoded by a polynucleotide of the invention is expressed in any convenient expression system, including, for example, bacterial, yeast, insect, amphibian and mammalian systems. Suitable vectors and host cells are described in U.S. Pat. No. 5,654,173. In the expression vector, a APRIL polypeptide-encoding polynucleotide is linked to a regulatory sequence as appropriate to obtain the desired expression properties. These-can include promoters (attached either at the 5' end of the sense strand or at the 3' end of the antisense strand), enhancers, terminators, operators, repressors, and inducers. The promoters can be regulated or constitutive. In some situations it may be desirable to use conditionally active promoters, such as tissue-specific or developmental stage-specific promoters. These are linked to the desired nucleotide sequence using the techniques described above for linkage to vectors. Any techniques known in the art can be used. In other words, the expression vector will provide a transcriptional and translational initiation region, which may be inducible or constitutive, where the coding region is operably linked under the transcriptional control of the transcriptional initiation region, and a transcriptional and translational termination region. These control regions may be native to the APRIL gene, or may be derived from exogenous sources.

[0075]Expression vectors generally have convenient restriction sites located near the promoter sequence to provide for the insertion of nucleic acid sequences encoding heterologous proteins. A selectable marker operative in the expression host may be present. Expression vectors may be used for the production of fusion proteins, where the exogenous fusion peptide provides additional functionality, i.e. increased protein synthesis, stability, reactivity with defined antisera, an enzyme marker, e.g. β-galactosidase, etc.

[0076]Expression cassettes may be prepared comprising a transcription initiation region, the gene or fragment thereof, and a transcriptional termination region. Of particular interest is the use of sequences that allow for the expression of functional epitopes or domains, usually at least about 8 amino acids in length, more usually at least about 15 amino acids in length, to about 25 amino acids, and up to the complete open reading frame of the gene. After introduction of the DNA, the cells containing the construct may be selected by means of a selectable marker, the cells expanded and then used for expression.

[0077]APRIL polypeptides may be expressed in prokaryotes or eukaryotes in accordance with conventional ways, depending upon the purpose for expression. For large scale production of the protein, a unicellular organism, such as E. coli, B. subtilis, S. cerevisiae, insect cells in combination with baculovirus vectors, or cells of a higher organism such as vertebrates, particularly mammals, e.g. COS 7 cells, HEK 293, CHO, Xenopus Oocytes, etc., may be used as the expression host cells. In some situations, it is desirable to express a polymorphic APRIL nucleic acid molecule in eukaryotic cells, where the polymorphic APRIL protein will benefit from native folding and post-translational modifications. Small peptides can also be synthesized in the laboratory. Polypeptides that are subsets of the complete APRIL sequence may be used to identify and investigate parts of the protein important for function.

[0078]Specific expression systems of interest include bacterial, yeast, insect cell and mammalian cell derived expression systems. Representative systems from each of these categories is are provided below:

[0079]Bacteria. Expression systems in bacteria include those described in Chang et al., Nature (1978) 275:615; Goeddel et al., Nature (1979) 281:544; Goeddel et al., Nucleic Acids Res. (1980) 8:4057; EP 0 036, 776; U.S. Pat. No. 4,551,433; DeBoer et al., Proc. Natl. Acad. Sci. (USA) (1983) 80:21-25; and Siebenlist et al., Cell (1980) 20:269.

[0080]Yeast. Expression systems in yeast include those described in Hinnen et al., Proc. Natl. Acad. Sci. (USA) (1978) 75:1929; Ito et al., J. Bacteriol. (1983) 153:163; Kurtz et al., Mol. Cell. Biol. (1986) 6:142; Kunze et al., J. Basic Microbiol. (1985) 25:141; Gleeson et al., J. Gen. Microbiol. (1986) 132:3459; Roggenkamp et al., Mol. Gen. Genet. (1986) 202:302; Das et al., J. Bacteriol. (1984) 158:1165; De Louvencourt et al., J. Bacteriol. (1983) 154:737; Van den Berg et al., Bio/Technology (1990) 8:135; Kunze et al., J. Basic Microbiol. (1985) 25:141; Cregg et al., Mol. Cell. Biol. (1985) 5:3376; U.S. Pat. Nos. 4,837,148 and 4,929,555; Beach and Nurse, Nature (1981) 300:706; Davidow et al., Curr. Genet. (1985) 10:380; Gaillardin et al., Curr. Genet. (1985) 10:49; Ballance et al., Biochem. Biophys. Res. Commun. (1983) 112:284-289; Tilburn et al., Gene (1983) 26:205-221; Yelton et al., Proc. Natl. Acad. Sci. (USA) (1984) 81:1470-1474; Kelly and Hynes, EMBO J. (1985) 4:475-479; EP 0 244,234; and WO 91/00357.

[0081]Insect Cells. Expression of heterologous genes in insects is accomplished as described in U.S. Pat. No. 4,745,051; Friesen et al., "The Regulation of Baculovirus Gene Expression", in: The Molecular Biology Of Baculoviruses (1986) (W. Doerfler, ed.); EP 0 127,839; EP 0 155,476; and Vlak et al., J. Gen. Virol. (1988) 69:765-776; Miller et al., Ann. Rev. Microbiol. (1988) 42:177; Carbonell et al., Gene (1988) 73:409; Maeda et al., Nature (1985) 315:592-594; Lebacq-Verheyden et al., Mol. Cell. Biol. (1988) 8:3129; Smith et al., Proc. Natl. Acad. Sci. (USA) (1985) 82:8844; Miyajima et al., Gene (1987) 58:273; and Martin et al., DNA (1988) 7:99. Numerous baculoviral strains and variants and corresponding permissive insect host cells from hosts are described in Luckow et al., Bio/Technology (1988) 6:47-55, Miller et al., Generic Engineering (1986) 8:277-279, and Maeda et al., Nature (1985) 315:592-594.

[0082]Mammalian Cells. Mammalian expression is accomplished as described in Dijkema et al., EMBO J. (1985) 4:761, Gorman et al., Proc. Natl. Acad. Sci. (USA) (1982) 79:6777, Boshart et al., Cell (1985) 41:521 and U.S. Pat. No. 4,399,216. Other features of mammalian expression are facilitated as described in Ham and Wallace, Meth. Enz. (1979) 58:44, Barnes and Sato, Anal. Biochem. (1980) 102:255, U.S. Pat. Nos. 4,767,704, 4,657,866, 4,927,762, 4,560,655, WO 90/103430, WO 87/00195, and U.S. Pat. No. RE 30,985.

[0083]When any of the above host cells, or other appropriate host cells or organisms, are used to replicate and/or express the polynucleotides or nucleic acids of the invention, the resulting replicated nucleic acid, RNA, expressed protein or polypeptide, is within the scope of the invention as a product of the host cell or organism. The product is recovered by any appropriate means known in the art.

[0084]Once the gene corresponding to a selected polynucleotide is identified, its expression can be regulated-in the cell to which the gene is native. For example, an endogenous gene of a cell can be regulated by an exogenous regulatory sequence inserted into the genome of the cell at location sufficient to at least enhance expressed of the gene in the cell. The regulatory sequence may be designed to integrate into the genome via homologous recombination, as disclosed in U.S. Pat. Nos. 5,641,670 and 5,733,761, the disclosures of which are herein incorporated by reference, or may be designed to integrate into the genome via non-homologous recombination, as described in WO 99/15650, the disclosure of which is herein incorporated by reference. As such, also encompassed in the subject invention is the production of APRIL proteins without manipulation of the encoding nucleic acid itself, but instead through integration of a regulatory sequence into the genome of cell that already includes a gene encoding the desired protein, as described in the above incorporated patent documents.

[0085]Preparation of Antibodies Specific for APRIL and BLyS Polypeptides

[0086]The invention further can encompass the use of antibodies, particularly isolated antibodies, that are specific for APRIL and BLyS polypeptides. The antibodies of the invention are useful in a variety of diagnostic assays, as described in further detail below. For example, the antibodies can be used to detect and/or measure the levels of HT in a biological sample.

[0087]Isolated APRIL and BLyS polypeptides of the invention are useful for the production of antibodies, where short fragments provide for antibodies specific for the particular polypeptide, and larger fragments or the entire protein allow for the production of antibodies over the surface of the polypeptide. Accordingly, the methods of the present invention can utilize isolated antibodies which specifically bind a APRIL polypeptide, or antigenic fragment thereof. Antibodies may be raised to the wild-type or variant forms. Antibodies may be raised to isolated peptides corresponding to these domains, or to the native protein. Antibodies may be raised to polypeptides and/or peptide fragments of APRIL from any mammalian species. As one non-limiting example, an enzyme-linked immunosorbent assay (ELISA) can be used to determine the specificity of a given monoclonal antibody for a APRIL or BLyS polypeptide.

[0088]The APRIL and BLyS polypeptides are useful for the production of antibodies, where short fragments provide for antibodies specific for the particular polypeptide, and larger fragments or the entire protein allow for the production of antibodies over the surface of the polypeptide. As used herein, the term "antibodies" includes antibodies of any isotype, fragments of antibodies which retain specific binding to antigen, including, but not limited to, Fab, Fv, scFv, and Fd fragments, fusion proteins comprising such antibody fragments, detectably labeled antibodies, and chimeric antibodies. "Antibody specificity", in the context of antibody-antigen interactions, is a term well understood in the art, and indicates that a given antibody binds to a given antigen, wherein the binding can be inhibited by that antigen or an epitope thereof which is recognized by the antibody, and does not substantially bind to unrelated antigens. Methods of determining specific antibody binding are well known to those skilled in the art, and can be used to determine the specificity of antibodies for an APRIL or BLyS polypeptide.

[0089]Antibodies are prepared in accordance with conventional ways, where the expressed is polypeptide or protein is used as an immunogen, by itself or conjugated to known immunogenic carriers, e.g. KLH, pre-S HBsAg, other viral or eukaryotic proteins, or the like. Various adjuvants may be employed, with a series of injections, as appropriate. For monoclonal antibodies, after one or more booster injections, the spleen is isolated, the lymphocytes immortalized by cell fusion, and then screened for high affinity antibody binding. The immortalized cells, i.e. hybridomas, producing the desired antibodies may then be expanded. For further description, see Monoclonal Antibodies: A Laboratory Manual, Harlow and Lane eds., Cold Spring Harbor Laboratories, Cold Spring Harbor, N.Y., 1988. If desired, the mRNA encoding the heavy and light chains may be isolated and mutagenized by cloning in E. coli, and the heavy and light chains mixed to further enhance the affinity of the antibody. Alternatives to in vivo immunization as a method of raising antibodies include binding to phage display libraries, usually in conjunction with in vitro affinity maturation.

[0090]Antibodies may be attached, directly or indirectly (e.g., via a linker molecule) to a solid support for use in a diagnostic assay to determine and/or measure the presence of HT in a biological sample. Attachment is generally covalent, although it need not be. Solid supports include, but are not limited to, beads (e.g., polystyrene beads, magnetic beads, and the like); plastic surfaces (e.g., polystyrene or polycarbonate multi-well plates typically used in an ELISA or radioimmunoassay (RIA), and the like); sheets, e.g., nylon, nitrocellulose, and the like; and chips, e.g., SiO₂ chips such as those used in microarrays. Accordingly, the invention further provides assay devices comprising antibodies attached to a solid support.

[0091]A single antibody or a battery of different antibodies can then be used to create an assay device. Such an assay device can be prepared using conventional technology known to those skilled in the art. The antibody can be purified and isolated using known techniques and bound to a support surface using known procedures. The resulting surface having antibody bound thereon can be used to assay a test sample, e.g., a biological sample, in vitro to determine if the sample contains one or more types of HT molecules. For example, antibodies which bind only to a specific HT epitope can be attached to the surface of a material. Alternatively, a plurality of specific antibodies, which may be arranged in an array, wherein antibodies specific for two or more different HT epitopes are attached to the solid support, can be used. A test sample is brought into contact with the antibodies bound to the surface of material. Specific binding can be detected using any known method. If specific binding is not detected, it can be deduced that the sample does not contain the specific HT epitope. As one non-limiting example of how specific binding can be detected, once the test sample has been contacted with the antibodies bound to the solid support, a second, detectably-labeled antibody can be added, which recognizes a HT epitope distinct from the epitope recognized by the solid support-bound antibody.

[0092]A variety of other reagents may be included in the assays to detect HT polypeptides described herein. These include reagents such as salts, neutral proteins, e.g. albumin, detergents, etc., that are used to facilitate optimal protein-protein binding, and/or reduce non-specific or background interactions. Reagents that improve the efficiency of the assay, such as protease inhibitors, anti-microbial agents, etc. may be used. The components are added in any order that provides for the requisite binding. Incubations are performed at any suitable temperature, typically between 4° C. and 40° C. Incubation periods are selected for optimum activity, but may also be optimized to facilitate rapid high-throughput screening. Typically between 0.1 and 1 hours will be sufficient.

[0093]Bispecific antibodies are antibodies that have binding specificities for at least two different epitopes. Exemplary bispecific antibodies may bind to two different epitopes of the B cell surface marker. Other such antibodies may bind a first B cell marker and further bind a second B cell surface marker. Alternatively, an anti-B cell marker binding arm may be combined with an arm which binds to a triggering molecule on a leukocyte such as a T-cell receptor molecule (e.g. CD2 or CD3), or Fc receptors for IgG (FcyR), such as FcyRI (CD64), FcyRII (CD32) and FcyRIII (CD16) so as to focus cellular defense mechanisms to the B cell. Bispecific antibodies may also be used to localize cytotoxic agents to the B cell. These antibodies possess a B cell marker-binding arm and an arm which binds the cytotoxic agent (e.g. saporin, anti-interferon-, vinca alkaloid, ricin A chain, methotrexate or radioactive isotope hapten).

[0094]Bispecific antibodies can be prepared as full length antibodies or antibody fragments (e.g. F (ab') 2 bispecific antibodies). Methods for making bispecific antibodies are known in the art. Traditional production of full length bispecific antibodies is based on the coexpression of two immunoglobulin heavy chain-light chain pairs, where the two chains have different specificities (Millstein et al, Nature, 305: 537-539 (1983)).

[0095]Because of the random assortment of immunoglobulin heavy and light chains, these hybridomas (quadromas) produce a potential mixture of 10 different antibody molecules, of which only one has the correct bispecific structure. Purification of the correct molecule, which is usually done by affinity chromatography steps, is rather cumbersome, and the product yields are low. Similar procedures are disclosed in WO93/08829, and in Traunecker et al., EMBO J., 10: 3655-3659 (1991).

[0096]According to a different approach, antibody variable domains with the desired binding specificities (antibody-antigen combining sites) are fused to immunoglobulin constant domain sequences. The fusion preferably is with an immunoglobulin heavy chain constant domain, comprising at least part of the hinge, CH2, and CH3 regions. It is preferred to have the first heavy-chain constant region (CH1) containing the site necessary for light chain binding, present in at least one of the fusions. DNAs-encoding the immunoglobulin heavy chain fusions and, if desired, the immunoglobulin light chain, are inserted into separate expression vectors, and are co-transfected into a suitable host organism. This provides for great flexibility in adjusting the mutual proportions of the three polypeptide fragments in embodiments when unequal ratios of the three polypeptide chains used in the construction provide the optimum yields. It is, however, possible to insert the coding sequences for two or all three polypeptide chains in one expression vector when the expression of at least two polypeptide chains in equal ratios results in high yields or when the ratios are of no particular significance.

[0097]In a preferred embodiment of this approach, the bispecific antibodies are composed of a hybrid immunoglobulin heavy chain with a first binding specificity in one arm, and a hybrid immunoglobulin heavy chain-light chain pair (providing a second binding specificity) in the other arm. It was found that this asymmetric structure facilitates the separation of the desired bispecific compound from unwanted immunoglobulin chain combinations, as the presence of an immunoglobulin light chain in only one half of the bispecific molecule provides for a facile way of separation. This approach is disclosed in WO 94/04690. For further details of generating bispecific antibodies see, for example, Suresh et al., Methods in Enzymology, 121: 210 (1986). According to another approach described in U.S. Pat. No. 5,731,168, the interface between a pair of antibody molecules can be engineered to maximize the percentage of heterodimers which are recovered from recombinant cell culture. The preferred interface comprises at least a part of the CH3 domain of an antibody constant domain. In this method, one or more small amino acid side chains from the interface of the first antibody molecule are replaced with larger side chains (e.g. tyrosine or tryptophan). Compensatory "cavities" of identical or similar size to the large side chain (s) are created on the interface of the second antibody molecule by replacing large amino acid side chains with smaller ones (e.g. alanine or threonine). This provides a mechanism for increasing the yield of the heterodimer over other unwanted end-products such as homodimers.

[0098]Bispecific antibodies include cross-linked or "heteroconjugate" antibodies. For example, one of the antibodies in the heteroconjugate can be coupled to avidin, the other to biotin. Such antibodies have, for example, been proposed to target immune system cells to unwanted cells (U.S. Pat. No. 4,676,980), and for treatment of HIV infection (WO 91/00360, WO 92/200373, and EP 03089). Heteroconjugate antibodies may be made using any convenient cross-linking methods. Suitable cross-linking agents are well known in the art, and are disclosed in U.S. Pat. No. 4,676,980, along with a number of cross-linking techniques.

[0099]Techniques for generating bispecific antibodies from antibody fragments have also been described in the literature. For example, bispecific antibodies can be prepared using chemical linkage. Brennan et al, Science, 229: 81 (1985) describe a procedure wherein intact antibodies are proteolytically cleaved to generate F (ab') 2 fragments. These fragments are reduced in the presence of the dithiol complexing agent sodium arsenite to stabilize vicinal dithiols and prevent intermolecular disulfide formation. The Fab' fragments generated are then converted to thionitrobenzoate (TNB) derivatives. One of the Fab'-TNB derivatives is then reconverted to the Fab'-thiol by reduction with mercaptoethylamine and is mixed with an equimolar amount of the other Fab'-TNB derivative to form the bispecific antibody. The bispecific antibodies produced can be used as agents for the selective immobilization of enzymes.

[0100]Recent progress has facilitated the direct recovery of Fab'-SH fragments from E. coli, which can be chemically coupled to form bispecific antibodies. Shalaby et al., J. Exp. Med., 175: 217-225 (1992) describe the production of a fully humanized bispecific antibody F (ab') 2 molecule. Each Fab' fragment was separately secreted from E. coli and subjected to directed chemical coupling in vitro to form the bispecific antibody. The bispecific antibody thus formed was able to bind to cells overexpressing the ErbB2 receptor and normal human T cells, as well as trigger the lytic activity of human cytotoxic lymphocytes against human breast tumor targets.

[0101]Various techniques for making and isolating bispecific antibody fragments directly from recombinant cell culture have also been described. For example, bispecific antibodies have been produced using leucine zippers. Kostelny et al., J. Immunol., 148 (5): 1547-1553 (1992). The leucine zipper peptides from the Fos and Jun proteins were linked to the Fab portions of two different antibodies by gene fusion.

[0102]The antibody homodimers were reduced at the hinge region to form monomers and then re-oxidized to form the antibody heterodimers. This method can also be utilized for the production of antibody homodimers.

[0103]The "diabody" technology described by Hollinger et al, Proc. Natl. Acad. Sci. USA, 90: 6444-6448 (1993) has provided an alternative mechanism for making bispecific antibody fragments. The fragments comprise a heavy-chain variable domain (VH) connected to a light-chain variable domain (VL) by a linker which is too short to allow pairing between the two domains on the same chain. Accordingly, the VH and VL domains of one fragment are forced to pair with the complementary VL and VH domains of another fragment, thereby forming two antigen-binding sites. Another strategy for making bispecific antibody fragments by the use of single-chain Fv (sFv) dimers has also been reported. See Gruber et al., J. Immunology, 152: 5368 (1994). Antibodies with more than two valencies are also contemplated. For example, trispecific antibodies can be prepared. Tutt et al., J. Immunol. 147: 60 (1991).

[0104]Diagnostic Assays

[0105]The invention further provides methods for detecting the presence of and/or a level of HT mRNA in a biological sample; and methods for detecting the presence of and/or a level of HT polypeptide in a biological sample.

[0106]A particularly preferred embodiment involves the serial detection of each individual subunits in the sample in such a way that only HT molecules will be detected. This is done using a procedure which is an adaptation of how a standard ELISA works. In particular, an antibody to either APRIL or BLyS is immobilized (e.g., attached to a bead) and the sample is contacted to this antibody. Those molecules comprising the subunit for which the antibody is specific for will bind, while those homotrimers which do not include that subunit will be washed away. The bound molecules will then be put in contact with an detectable (labeled) antibody to the second subunit (e.g., biotinylated) and those molecules that were first captured that also include the second subunit (i.e., those molecules that are HT) will be detected. More specifically, if the first antibody is against APRIL, all homotrimeric BLyS molecules will be washed away in the first step. When these molecules are contacted with the second antibody that is specific for BLyS, all homotrimeric APRIL molecules will not bind and will be washed away. Thus, the remaining signal will be representative of the HT molecules (those comprising both BLyS and APRIL) in the sample. The known standard 2 APRIL/one BLyS HT molecule is used to construct a standard concentration curve, and the experimental signal obtained is compared to this standard curve to produce an estimated of the HT concentration in the biological sample.

[0107]In other embodiments, a method is provide for detecting a level of HT mRNA in a biological sample derived from an individual, comprising analyzing a polynucleotide sample from an individual for the level of HT polypeptide-encoding mRNA. The level of HT mRNA may be associated with autoimmune disease.

[0108]In still other embodiments, a method is provided for detecting the presence of and/or the level of a HT polypeptide in a biological sample.

[0109]A number of methods are available for determining the expression level of a HT nucleic acid molecule, e.g., a HT mRNA, or HT polypeptide in a particular sample. Diagnosis may be performed by a number of methods to determine the absence or presence or altered amounts of normal or abnormal HT mRNA in a patient sample. For example, detection may utilize staining of cells or histological sections with labeled antibodies, performed in accordance with conventional methods. Cells are permeabilized to stain cytoplasmic molecules. The antibodies of interest are added to the cell sample, and incubated for a period of time sufficient to allow binding to the epitope, usually at least about 10 minutes. The antibody may be labeled with radioisotopes, enzymes, fluorescers, chemiluminescers, or other labels for direct detection. Alternatively, a second stage antibody or reagent is used to amplify the signal. Such reagents are well known in the art. For example, the primary antibody may be conjugated to biotin, with horseradish peroxidase-conjugated avidin added as a second stage reagent. Alternatively, the secondary antibody conjugated to a fluorescent compound, e.g. fluorescein, rhodamine, Texas red, etc. Final detection uses a substrate that undergoes a color change in the presence of the peroxidase. The absence or presence of antibody binding may be determined by various methods, including flow cytometry of dissociated cells, microscopy, radiography, scintillation counting, etc. The presence and/or the level of a HT polypeptide may also be detected and/or quantitated in any way known to one of ordinary skill.

[0110]In addition, a test can include measurements of the expression of HT mRNA. Biochemical studies may be performed to determine whether a sequence polymorphism in a HT coding region or control regions is associated with disease. Disease associated polymorphisms may include deletion or truncation of the gene, mutations that alter expression level, that affect the activity of the protein, etc.

[0111]Changes in the promoter or enhancer sequence that may affect expression levels of HT can be compared to expression levels of the normal allele by various methods known in the art. Methods for determining promoter or enhancer strength include quantitation of the expressed natural protein; insertion of the variant control element into a vector with a reporter gene such as β-galactosidase, luciferase, chloramphenicol acetyltransferase, etc. that provides for convenient quantitation; and the like.

[0112]Diagnostic methods of the subject invention in which the level of HT levels is of interest will typically involve comparison of the HT nucleic acid or protein abundance of a sample of interest with that of a control value to determine any relative differences, where the difference may be measured qualitatively and/or quantitatively, which differences are then related to the presence or absence of an abnormal HT levels. A variety of different methods for determine the nucleic acid abundance in a sample are known to those of skill in the art, where particular methods of interest include those described in: Pietu et al., Genome Res. (June 1996) δ: 492-503; Zhao et al., Gene (Apr. 24, 1995) 156: 207-213; Soares, Curr. Opin. Biotechnol. (October 1997) δ: 542-546; Raval, J. Pharmacol Toxicol Methods (November 1994) 32: 125-127; Chalifour et al., Anal. Biochem (Feb. 1, 1994) 216: 299-304; Stolz & Tuan, Mol. Biotechnol. (December 19960 6: 225-230; Hong et al., Bioscience Reports (1982) 2: 907; and McGraw, Anal. Biochem. (1984) 143: 298. Also of interest are the methods disclosed in WO 97/27317, the disclosure of which is herein incorporated by reference.

[0113]By a gene whose expression level is "correlated with" or "associated with" a particular physiologic state, it is intended a gene whose expression shows a statistically significant correlation with the physiologic state. The strength of the correlation between the expression level of a differentially expressed gene and the presence or absence of a particular physiologic state may be determined by a statistical test of significance. Methods for determining the strength of a correlation between the expression level of a differentially-expressed gene and a particular physiologic state by assigning a statistical score to the correlation are reviewed in Holloway et al. (2002) Nature Genetics Suppl. 32:481-89, Churchill (2002) Nature Genetics Suppl. 32:490-95, Quackenbush (2002) Nature Genetics Suppl. 32: 496-501; Slonim (2002) Nature Genetics Suppl. 32:502-08; and Chuaqui et al. (2002) Nature Genetics Suppl. 32:509-514; each of which is herein incorporated by reference in its entirety. The statistical scores may be used to select the genes whose expression levels have the greatest correlation with a particular physiologic state in order to increase the diagnostic or prognostic accuracy of the methods of the invention.

[0114]Additional tests that have been associated with autoimmune disease severity or progression can be combined with the HT test described above to render a full diagnosis or outlook result.

[0115]For example, the American College of Rheumatology has developed 11 criteria to diagnose SLE, which span the clinical spectrum of SLE in aspects of skin, systemic, and laboratory tests. These criteria include malar rash, discoid rash, sensitivity to sun light, oral ulcers, arthritis, serositis, kidney and central nervous system inflammation, blood alterations, and the presence of antinuclear antibodies. A patient must meet four of these criteria in order to be classified as a SLE patient. (Tan et al. (1982) Arthritis Rheumatol. 25: 1271-1277). SLE is usually confirmed by tests including, but not limited to, blood tests to detect anti-nuclear antibodies; blood and urine tests to assess kidney function; complement tests to detect the presence of low levels of complement that are often associated with SLE; a sedimentation rate (ESR) or C-reactive protein (CRP) to measure inflammation levels; X-rays to assess lung damage and EKGs to assess heart damage.

[0116]Monitoring Effects of Drug Treatment

[0117]Monitoring the influence of agents (e.g., drugs, compounds) on the levels of HT protein (e.g., modulation of transcriptional activation) can be applied not only in basic drug screening, but also in clinical trials. For example, the effectiveness of an agent determined by a screening assay as described herein to decrease HT protein levels, can be monitored in clinical trials of subjects exhibiting decreased HT gene expression or protein levels. In such clinical trials, the expression or activity of a HT gene, and preferably, other genes that have been implicated in, for example, a disorder associated with levels of HT protein can be used as a "read out" or markers of the phenotype of a particular cell, in the present case, B cells.

[0118]In some embodiments, the present invention provides a method for monitoring the effectiveness of treatment of a subject with an agent (e.g., an agonist, antagonist, peptidomimetic, protein, peptide, nucleic acid, small molecule, or other drug) comprising the steps of (i) obtaining a pre-administration sample from a subject prior to administration of the agent; (ii) detecting the level of expression of a HT protein or mRNA, in the pre-administration sample; (iii) obtaining one or more post-administration samples from the subject, (iv) detecting the level of expression or activity of the HT protein or mRNA in the post-administration samples; (v) comparing the level of expression or activity of the HT protein or mRNA in the pre-administration sample with the HT protein or mRNA in the post administration sample or samples; and (vi) altering the administration of the agent to the subject accordingly. According to such an embodiment, HT expression or activity may be used as an indicator of the effectiveness of an agent, even in the absence of an observable phenotypic response.

[0119]The basal expression level of HT in different tissue may be determined by analysis of tissue samples from individuals typed for the presence or absence of a specific polymorphism. Any convenient method may be use, e.g. ELISA, RIA, etc. for protein quantitation, northern blot or other hybridization analysis, quantitative RT-PCR, etc. for mRNA quantitation. The tissue specific expression is correlated with the genotype.

[0120]The alteration of HT expression in response to a modifier is determined by administering or combining the candidate modifier with an expression system, e.g. animal, cell, in vitro transcription assay, etc. The effect of the modifier on HT transcription and/or steady state mRNA levels is determined. As with the basal expression levels, tissue specific interactions are of interest. Correlations are made between the ability of an expression modifier to affect HT levels, and the presence of the provided polymorphisms. A panel of different modifiers, cell types, etc. may be screened in order to determine the effect under a number of different conditions.

[0121]Treatment Methods

[0122]The present invention provides a method of treating an individual clinically diagnosed with a condition associated with increased HT levels in serum. The methods generally comprises analyzing a biological sample to measure HT levels and comparing such levels to those present in healthy controls. A treatment plan that is most effective for individuals clinically diagnosed as having a condition associated with increased HT levels, such as autoimmune disease, is then selected and the patient is then treated accordingly. Thus, the invention further provides a method for predicting a patient's likelihood to respond to a drug treatment for a condition associated with increased HT levels, comprising determining a patient's expression of a HT gene, wherein the presence of a increased HT levels associated with an autoimmune condition, such as SLE, and is predictive of the patient's likelihood to respond to a drug treatment for the condition.

[0123]Thus, another aspect of the invention provides methods for tailoring an individual's therapeutic treatment with HT expression according to that individual's drug response. Pharmacogenomics allows a clinician or physician to target prophylactic or therapeutic treatments to patients who will most benefit from the treatment and to avoid treatment of patients who will experience toxic drug-related side effects.

[0124]Autoimmune Diseases

[0125]The following is a non-limiting list of the possible autoimmune diseases that treatment thereof could be aided by the use of the HT measuring assay presently disclosed. B-cell regulated autoimmune diseases include arthritis (rheumatoid arthritis, juvenile rheumatoid arthritis, osteoarthritis, psoriatic arthritis), psoriasis, dermatitis including atopic dermatitis; chronic autoimmune urticaria, polymyositis/dermatomyositis, toxic epidermal necrolysis, systemic scleroderma and sclerosis, responses associated with inflammatory bowel disease (IBD) (Crohn's disease, ulcerative colitis), respiratory distress syndrome, adult respiratory distress syndrome (ARDS), meningitis, allergic rhinitis, encephalitis, uveitis, colitis, glomerulonephritis, allergic conditions, eczema, asthma, conditions involving infiltration of T cells and chronic inflammatory responses, atherosclerosis, autoimmune myocarditis, leukocyte adhesion deficiency, systemic lupus erythematosus (SLE), lupus (including nephritis, non-renal, discoid, alopecia), juvenile onset diabetes, multiple sclerosis, allergic encephalomyelitis, immune responses associated with acute and delayed hypersensitivity mediated by cytokines and T-lymphocytes, tuberculosis, sarcoidosis, granulomatosis including Wegener's granulomatosis, agranulocytosis, vasculitis (including ANCA), aplastic anemia, Coombs positive anemia, Diamond Blackfan anemia, immune hemolytic anemia including autoimmune hemolytic anemia (AIHA), pernicious anemia, pure red cell aplasia (PRCA), Factor VIII deficiency, hemophilia A, autoimmune neutropenia, pancytopenia, leukopenia, diseases involving leukocyte diapedesis, CNS inflammatory disorders, multiple organ injury syndrome, myasthenia gravis, antigen-antibody complex mediated diseases, anti-glomerular basement membrane disease, anti-phospholipid antibody syndrome, allergic neuritis, Bechet disease, Castleman's syndrome, Goodpasture's Syndrome, Lambert-Eaton Myasthenic Syndrome, Reynaud's syndrome, Sjorgen's syndrome, Stevens-Johnson syndrome, solid organ transplant rejection (including pretreatment for high panel reactive antibody titers, IgA deposit in tissues, etc), graft versus host disease (GVHD), pemphigoid bullous, pemphigus (all including vulgaris, foliaceus), autoimmune polyendocrinopathies, Reiter's disease, stiff-man syndrome, giant cell arteritis, immune complex nephritis, IgA nephropathy, IgM polyneuropathies or IgM mediated neuropathy, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, autoimmune disease of the testis and ovary including autoimune orchitis and oophoritis, primary hypothyroidism; autoimmune endocrine diseases including autoimmune thyroiditis, chronic thyroiditis (Hashimoto's Thyroiditis), subacute thyroiditis, idiopathic hypothyroidism, Addison's disease, Grave's disease, autoimmune polyglandular syndromes (or polyglandular endocrinopathy syndromes), Type I diabetes also referred to as insulin-dependent diabetes mellitus (IDDM) and Sheehan's syndrome; autoimmune hepatitis, Lymphoid interstitial pneumonitis (HIV), bronchiolitis obliterans (non-transplant) vs NSIP, Guillain-Barre'Syndrome, Large Vessel Vasculitis (including Polymyalgia Rheumatica and Giant Cell (Takayasu's) Arteritis), Medium Vessel Vasculitis (including Kawasaki's Disease and Polyarteritis Nodosa), ankylosing spondylitis, Berger's Disease (IgA nephropathy), Rapidly Progressive Glomerulonephritis, Primary biliary cirrhosis, Celiac sprue (gluten enteropathy), Cryoglobulinemia, ALS, and coronary artery disease.

[0126]BLyS and/or APRIL Antagonists

[0127]If high levels of HT in a patient suffering from an autoimmune disease are seen, this suggests the likelihood that the patient will response favorably to inhibition of BLyS and/or APRIL. Thus, the present invention also comprises BLyS and/or APRIL antagonists that are used for the treatment of autoimmune diseases wherein the patient has elevated levels of HT. The following are representative examples of BLyS and/or APRIL antagonists that could be utilized to treat such patients. For the purposes of functioning as a BLyS and/or APRIL antagonist, the extracellular domain of any of the TNFR family receptors is a polypeptide essentially free of the transmembrane or cytoplasmic domains that generally retains the ability to bind BLyS. Specifically, the extracellular domain of TACI can comprise amino acids 1 to 154 of the TACI polypeptide sequence (SEQ ID NO: 2). Additionally, the ECD can be fragments or variants of this sequence, such as ECD forms of TACI as described in von Bulow et al., supra, WO 98/39361, WO 00/40716, WO 01/85782, WO 01/87979, and WO 01/81417. In particular, these ECD forms can comprise amino acids 1-106 of SEQ ID NO:2, amino acids 1-142 of SEQ ID NO:2, amino acids 30-154 of SEQ ID NO:2, amino acids 30-106 of SEQ ID NO:2, amino acids 30-110 of SEQ ID NO:2, amino acids 30-119 of SEQ ID NO:2, amino acids 1-166 of SEQ ID NO:2, amino acids 1-165 of SEQ ID NO:2, amino acids 1-114 of SEQ ID NO: 2, amino acids 1-119 of SEQ ID NO:2, amino acids 1-120 of SEQ ID NO:2, and amino acids 1-126 of SEQ ID NO:2. In addition, the TACI ECD can comprise those molecules having only one cysteine rich domain

[0128]ECD forms of BAFF-R include those comprising amino acids 1-71 of the BAFF-R polypeptide sequence (SEQ ID NO: 4). Additionally, the ECD can be fragments or variants of this sequence such as ECD forms of BAFF-R as described in WO 02/24909, WO 03/14294, and WO 02/38766. In particular, these ECD forms can comprise amino acids 1-77 of SEQ ID NO: 4, amino acids 7-77 of SEQ ID NO:4, amino acids 1-69 of SEQ ID NO:4, amino acids 7-69 of SEQ ID NO:4, amino acids 2-62 of SEQ ID NO:4, amino acids 2-71 of SEQ ID NO:4, amino acids 1-61 of SEQ ID NO:4 and amino acids 2-63 of SEQ ID NO:4, amino acids 1-45 of SEQ ID NO:4, amino acids 1-39 of SEQ ID NO:4, amino acids 7-39 of SEQ ID NO:4, amino acids 1-17 of SEQ ID NO:4, amino acids 39-64 of SEQ ID NO:4, amino acids 19-35 of SEQ ID NO:4, and amino acids 17-42 of SEQ ID NO:4. In addition, the BAFF-R ECD can comprise those molecules having a cysteine rich domain.

[0129]ECD forms of BCMA include those comprising amino acids 1-48 of the BCMA polypeptide sequence (SEQ ID NO: 6). Additionally, the ECD can be fragments or variants of this sequence, such as ECD forms of BCMA as described in WO 00/40716 and WO 05/075511. In particular, these ECD forms can comprise amino acids 1-150 of SEQ ID NO:6, amino acids 1-48 of SEQ ID NO:6, amino acids 1-41 of SEQ ID NO:6, amino acids 8-41 of SEQ ID NO:6, amino acids 8-37 of SEQ ID NO:6, amino acids 8-88 of SEQ ID NO:6, amino acids 41-88 of SEQ ID NO:6, amino acids 1-54 of SEQ ID NO:6, amino acids 4-55 of SEQ ID NO:6, amino acids 4-51 of SEQ ID NO:6, and amino acids 21-53 of SEQ ID NO:6. In addition, the BCMA ECD can comprise those molecules having only a partial cysteine rich domain.

[0130]In a further embodiment, the BLyS binding region of a BLyS receptor (e.g., an extracellular domain or fragment thereof of BAFF-R, BCMA or TACI) can be fused to an Fc portion of an immunoglobulin molecule to facilitate its solubility in vivo. According to one embodiment, the BLyS and/or APRIL antagonist binds to a BLyS polypeptide with a binding affinity of 100 nM or less. According to another embodiment, the BLyS and/or APRIL antagonist binds to a BLyS polypeptide with a binding affinity of 10 nM or less. According to yet another embodiment, the BLyS and/or APRIL antagonist binds to a BLyS polypeptide with a binding affinity of 1 nM or less.

[0131]In another example, BLyS and/or APRIL antagonists include BLyS binding polypeptides that are not native sequences or variants thereof. Some examples of such polypeptides are those having the sequence of Formula I, Formula II, Formula III as described in WO 05/000351. In particular, some binding polypeptides include ECFDLLVRAWVPCSVLK (SEQ ID NO:13), ECFDLLVRHWVPCGLLR (SEQ ID NO:14), ECFDLLVRRWVPCEMLG (SEQ ID NO:15), ECFDLLVRSWVPCHMLR (SEQ ID NO:16), ECFDLLVRHWVACGLLR (SEQ ID NO:17), or sequences listed in FIG. 32 of WO 05/000351.

[0132]Alternatively, the BLyS and/or APRIL antagonist can bind an extracellular domain of native sequence TACI, BAFF-R, or BCMA at its BLyS binding region to partially or fully block, inhibit or neutralize BLyS binding in vitro, in situ, or in vivo. For example, such indirect antagonist is a TACI antibody that binds in a region of TACI such that the binding of BLyS is sterically hindered. For example, binding at amino acids 72-109 or a neighboring region is believed to block BLyS binding. It could also be advantageous to block APRIL binding to this molecule, which is believed to occur in the region of amino acids 82-222. Another BLyS and/or APRIL antagonist is a BAFF-R antibody that binds in a region of BAFF-R such that binding of human BAFF-R to BLyS is sterically hindered. For example, binding at amino acids 23-38 or amino acids 17-42 or a neighboring region is believed to block BLyS binding. Finally, a further indirect antagonist would be a APRIL antibody that binds in a region of APRIL such that the binding of BLyS is sterically hindered. For example, binding at amino acids 5-43 or a neighboring region is believed to block BLyS (or APRIL) binding.

[0133]In some embodiments, a BLyS and/or APRIL antagonist according to this invention includes BLyS antibodies. The term "antibody" when referring to is used in the broadest sense and specifically covers, for example, monoclonal antibodies, polyclonal antibodies, antibodies with polyepitopic specificity, single chain antibodies, and fragments of antibodies. According to some embodiments, a polypeptide of this invention is fused into an antibody framework, for example, in the variable region or in a CDR such that the antibody can bind to and inhibit BLyS binding to TACI, BAFF-R, or BCMA or inhibits BLyS signaling. The antibodies comprising a polypeptide of this invention can be chimeric, humanized, or human. The antibodies comprising a polypeptide of this invention can be an antibody fragment. Alternatively, an antibody of this invention can be produced by immunizing an animal with a polypeptide of this invention. Thus, an antibody directed against a polypeptide of this invention is contemplated.

[0134]In particular, antibodies specific for BLyS that bind within a region of human BLyS (SEQ ID NO: 8) comprising residues 162-275 and/or a neighboring amino acid of amino acids selected from the group consisting of 162, 163, 206, 211, 231, 233, 264 and 265 of human BLyS are contemplated. The binding of the antibodies are such that the antibody sterically hinders BLyS binding to one or more of its receptors. Such antibodies are described in WO 02/02641 and WO 03/055979. A particularly preferred antibody is the one described as Lymphostat-B (Baker et al. (2003) Arthritis Rheum, 48, 3253-3265).

[0135]Other Immunosuppressive Drugs

[0136]The present method contemplates the use of other immunosuppressive drugs either singly or in combination with a BLyS and/or APRIL inhibitor. These other drugs include, but are not limited to, immunosuppressive agents such as calcineurin inhibitors (e.g., cyclosporin A or FK506), steroids (e.g., methyl prednisone or prednisone), or immunosuppressive agents that arrest the growth of immune cells (e.g., rapamycin), anti-CD40 pathway inhibitors (e.g., anti-CD40 antibodies, anti-CD40 ligand antibodies and small molecule inhibitors of the CD40 pathway), transplant salvage pathway inhibitors (e.g., mycophenolate mofetil (MMF)), IL-2 receptor antagonists (e.g., Zeonpax© from Hoffmann-1 a Roche Inc., and Simulet from Novartis, Inc.), or analogs thereof, cyclophosphamide, thalidomide, azathioprine, monoclonal antibodies (e.g., Daclizumab (anti-interleukin (IL)-2), Infliximab (anti-tumor necrosis factor), MEDI-205 (anti-CD2), abx-cbl (anti-CD147)), and polyclonal antibodies (e.g., ATG (anti-thymocyte globulin)).

[0137]Pharmaceutical Formulations

[0138]Therapeutic formulations of the BLyS and/or APRIL antagonists such as BLyS-binding antibodies used in accordance with the present invention are prepared for storage by mixing an antibody having the desired degree of purity with optional pharmaceutically acceptable carriers, excipients or stabilizers (Remitgtorz's Pharmaceutical Science 16th edition, Osol, A. Ed. (1980)), in the form of lyophilized formulations or aqueous solutions. Acceptable carriers, excipients, or stabilizers are nontoxic to recipients at the dosages and concentrations employed, and include buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid and methionine; preservatives (such as octadecyldimethylbenzyl ammonium chloride; hexamethonium chloride; benzalkonium chloride, benzethonium chloride; phenol, butyl or benzyl alcohol; alkyl parabens such as methyl or propyl paraben; catechol; resorcinol; cyclohexanol; 3-pentanol; and m-cresol); low molecular weight (less than about 10 residues) polypeptides; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as olyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, histidine, arginine, or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugars such as sucrose, mannitol, trehalose or sorbitol; salt-forming counter-ions such as sodium; metal complexes (e.g. Zn-protein complexes); and/or non-ionic surfactants such as TWEEN, PLURONICS® or polyethylene glycol (PEG)).

[0139]The formulation herein may also contain more than one active compound as necessary for the particular indication being treated, preferably those with complementary activities that do not adversely affect each other. For example, it may be desirable to further provide a cytotoxic agent, chemotherapeutic agent, cytokine or immunosuppressive agent (e.g. one which acts on T cells, such as cyclosporin or an antibody that binds T cells, e.g. one which binds LFA-1). The effective amount of such other agents depends on the amount of antibody present in the formulation, the type of disease or disorder or treatment, and other factors discussed above. These are generally used in the same dosages and with administration routes as described herein or about from 1 to 99% of the heretofore employed dosages.

[0140]The active ingredients may also be entrapped in microcapsules prepared, for example, by coacervation techniques or by interfacial polymerization, for example, hydroxymethylcellulose or gelatin-microcapsules and poly-(methylmethacylate) microcapsules, respectively, in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nano-particles and nanocapsules) or in macroemulsions. Such techniques are disclosed in Remington's Pharmaceutical Sciences 16th edition, Osol, A. Ed. (1980).

[0141]Sustained-release preparations may be prepared. Suitable examples of sustained-release preparations include semi-permeable matrices of solid hydrophobic polymers containing the antagonist, which matrices are in the form of shaped articles, e.g. films, or microcapsules. Examples of sustained-release matrices include polyesters, hydrogels (for example, poly (2-hydroxyethyl-methacrylate), or poly (vinylalcohol)), polylactides (U.S. Pat. No. 3,773,919), copolymers of L-glutamic acid and.ethyl-L-glutamate, non-degradable ethylene-vinyl acetate, degradable lactic acid-glycolic acid copolymers such as the LUPRON DEPOT (injectable microspheres composed of lactic acid-glycolic acid copolymer and leuprolide acetate), and poly-D-(-)-3-hydroxybutyric acid.

[0142]The formulations to be used for in vivo administration must be sterile. This is readily accomplished by filtration through sterile filtration membranes.

EXPERIMENTAL

[0143]The following examples are put forth so as to provide those of ordinary skill in the art with a complete disclosure and description of how to make and use the present invention, and are not intended to limit the scope of what the inventors regard as their invention nor are they intended to represent that the experiments below are all or the only experiments performed.

[0144]Efforts have been made to ensure accuracy with respect to numbers used (e.g. amounts, temperature, etc.) but some experimental errors and deviations should be accounted for. Unless indicated otherwise, parts are parts by weight, molecular weight is weight average molecular weight, temperature is in degrees Celsius, and pressure is at or near atmospheric.

Example 1

Assay to Measure HT Levels

[0145]Reagents: Anti-APRIL antibody conjugated to bead (ex. ZGEN anti-APRIL antibody E9617 (clone 319.6.8.5) conjugated to BioRad xMap bead 106 (Hercules, Calif.)) [0146]Anti-BLyS antibody biotinylated (ZGEN anti-BLyS antibody E4731 (clone 258.2.1.9.1.3) biotinylated) [0147]Streptavidin-PE (Jackson ImmunoResearch. Labs, Inc (West Grove, Pa.) #016-110-084) [0148]Multiscreen plates (Millipore (Billerica, Mass.), MABVN1250) ELISA B (ELISA C+1% BSA+NaAz) [0149]APRIL/BLyS Heterotrimer LOT A1642F Standard (25 ng/mL), QC1 (7.5 ng/mL), and QC2 (500 pg/mL) (2 APRIL subunits, one BLyS) [0150]Samples [0151]Human AB Serum (prescreened for low BLyS and APRIL content) [0152]Shaker [0153]1) Bring all reagents to room temperature [0154]2) Block plate: add 100 uL of ELISA B to all wells, shake for 10', vacuum. [0155]3) Vortex beads 30'', sonicate beads 30'' [0156]a. Determine volume of beads to add: 5K beads/well in 25 uL/well ELISA B [0157]b. For one full plate 2.5 mL+5E5 beads [0158]4) Add 25 uL bead mixture per well to all wells. [0159]5) Dilute standards: Dilute A1642F standard (25 ng/mL) in ELISA B, 1:3 six times for an 7 point dilution series: 25000, 8333, 2778, 926, 309, 103, and 34 pg/mL. [0160]6) Add 25 uL 25000 pg/mL standard to A1, 8333 pg/mL standard to B1, etc. [0161]7) Add 25 uL QC1 to A2, add 25 uL QC2 to B2. [0162]8) Add 25 uL serum to all standard, background, and QC wells. [0163]9) Add 25 uL ELISA B to all sample wells and the background well. [0164]10) Add 25 uL serum sample to each sample well *, **. [0165]11) Seal plate and cover in foil. Place on shaker at 600 RPM for 60' at RT. [0166]12) Vacuum. Wash plate with 2×100 uL ELISA B. [0167]13) Add 25 uL/well of 1 ug/mL antibody E4731-biotin. [0168]14) Seal plate and cover in foil. Place on shaker at 600 RPM for 60' [0169]15) Without washing or vacuuming add 25 uL/well 1:100 SA-PE in ELISA B. [0170]16) Seal plate and cover in foil. Place on shaker at 600 RPM for 30' [0171]17) Vacuum. Wash plate with 2×100 uL ELISA B. [0172]18) Add 110 uL ELISA B per well. Mix at 600 RPM for 5' [0173]19) Run on Luminex 100.

TABLE-US-00001 [0173]Plate Map 1 2 3 4 5 6 7 8 9 10 11 12 A 25000 QC1 S2 S4 S6 S8 S10 S12 S14 S16 S18 S20 B 8333 QC2 1:4 1:4 1:4 1:4 1:4 1:4 1:4 1:4 1:4 1:4 C 2778 1:8 1:8 1:8 1:8 1:8 1:8 1:8 1:8 1:8 1:8 D 926 1:16 1:16 1:16 1:16 1:16 1:16 1:16 1:16 1:16 1:16 E 309 S1 S3 S5 S7 S9 S11 S13 S15 S17 S19 S21 F 103 1:4 1:4 1:4 1:4 1:4 1:4 1:4 1:4 1:4 1:4 1:4 G 34 1:8 1:8 1:8 1:8 1:8 1:8 1:8 1:8 1:8 1:8 1:8 H B 1:16 1:16 1:16 1:16 1:16 1:16 1:16 1:16 1:16 1:16 1:16

It is very important to run samples neat and at the following dilutions: 1:4, 1:8, and 1:16. This is necessary to allow native HT complexes to dissociate, and this is not a serum effect.

[0174]Serum concentration must be kept constant throughout the dilution series by diluting samples with the serum standard. Having less than 25 uL serum in each well can cause those wells to exhibit erroneous values.

TABLE-US-00002 Example of assay performance: Heterotrimer pg/mL Statistics Expected Observed % CV Relative Error Standards 25000 27062 2.0% -8.2% 8333 8039 0.4% 3.5% 2778 2931 3.0% -5.5% 926 874 3.6% 5.6% 309 316 1.4% -2.5% 103 110 13.0% -7.2% 34 32 13.9% 7.3% QC1 7500 7259 12.3% 3.2% QC2 500 455 5.5% 8.9%

[0175]Acceptable values for the standard and quality controls are +/-25% of expected values. The assay LOD is expected to be 100 pg/mL with samples run neat (100% serum). The assay may run accurately down to 34 pg/mL.

[0176]The standard used in this assay is a HT containing 2 APRIL subunits and 1 BLyS subunit. The absolute values of native HT will be different if this molecule is relatively uncommon in patient serum, however, at this time there is evidence that there is any bias for any particular trimeric combination.

Example 2

Measurement of HT in Patient and Healthy Control Sera

[0177]ZymoZipper N-terminal trimerization domain enabled production of recombinant BLyS/APRIL heterotrimers (rHT), which were used as a standard to develop a bead-based immunoassay to quantitate native HT in human serum as described in Example 1. This assay, along with BLyS- and APRIL-specific ELISAs were used to measure these 3 ligands in sera from healthy controls (HC; n=79) and from systemic lupus erythematosus (SLE; n=30) and rheumatoid arthritis (RA; n=29) patients (see FIGS. 1 and 2). Biological activity of rHT was compared with that of rBLyS and rAPRIL in a 4-hr signaling assay using TACI-transfected Jurkat cells with a NFκB/luciferase reporter gene, and in a 4-day primary human B cell proliferation assay.

[0178]Significantly more SLE patients than HC had detectable HT in serum (70% vs. 14%, p<0.0001, Fisher's exact test), and 24% of RA patients had detectable HT. In this cohort, mean serum HT levels were 177 pg/mL (SLE), 64 pg/mL (RA), and 66 pg/mL (HC). In the TACI-Jurkat assay (see Example 4), rHT signaling is similar to that of BLyS or APRIL. In the B cell assay (see Example 3), rHT are less potent inducers than the homotrimeric ligands (EC50 values: 0.02 nM for BLyS, 0.17 nM for APRIL and 4.06 nM for HT). This likely reflects the predominant expression of BAFF-R, to which our rHT bind poorly, on circulating B cells. Atacicept and BCMA-Ig neutralize the activity of all 3 ligands in these assays, while BAFFR-Ig exhibits little to no inhibition of rHT activity. Our data confirm that native HT are elevated in autoimmune patients, and demonstrate that rHT are biologically active. Whether native HT have a biological role distinct from their homotrimeric counterparts remains to be determined. Atacicept inhibits the bioactivity of all 3 ligand forms, which may prove important in the clinical treatment of autoimmune disease.

[0179]In a second set of SLE patients, including 72 SLE patients and 42 healthy controls. BLyS and APRIL levels were determined by ELISA. HT levels were measured in 36 patients and 25 controls using a luminex-based assay. HT were detected in more patients than controls (72% vs. 32% χ²=0.0019).

Example 3

B-Cell Proliferation Assay

[0180]A vial containing 1×108 frozen, apheresed peripheral blood mononuclear cells (PBMCs) was quickly thawed in 370 C water bath and resuspended in 25 ml B cell medium (RPMI-1640 Medium, 10% heat inactivated fetal bovine serum, 5% L-glutamine, 5% Pen/Strep) in a 50 ml tube. Cells were tested for viability using Trypan Blue (GIBCO BRL, Gaithersburg, Md.). CD 19+B cells were then isolated by positive selection using anti-CD 19 coated microbeads (Miltenyi Biotech). Coated cells were then isolated on a MACS LS column (Miltenyi Biotech) The B cells were resuspended at a final concentration of 1.6×10 cells/ml in B cell medium and plated at 100 μl/well in a 96 well U bottom plate (Falcon, VWR, Seattle, Wash.). HT and homotrimeric ligands were prepared and were added to the cells in 3 fold dilutions from 1000 ng/ml to 0 ng/ml. Final volume was 200 μl/well.

[0181]The cells were then incubated at 370 C in a humidified incubator for 72 hours. Sixteen hours prior to harvesting, 1 μCi 3H thymidine was added to all wells. The cells were harvested into a 96 well filter plate (UniFilter GF/C, Packard, Meriden, Conn.) where they were harvested using a cell harvester (Packard) and collected according to manufacturer's instructions. The plates were dried at 55° C. for 20-30 minutes and the bottom of the wells were sealed with an opaque plate sealer. To each well was added 0.25 ml of scintillation fluid (Microscint-O, Packard) and the plate was read using a TopCount Microplate Scintillation Counter (Packard).

Example 4

TACI Tranfected Jurkat Cell Bioassay

[0182]The TACI in vitro bioassay uses a Jurkat cell line (human acute T cell lymphocyte, KZ142, clone #24) that has been transfected with two plasmids. First, the cell line was transfected with a plasmid containing a luciferase reporter gene under control of the NF-κβ/AP-1 promoter and a neomycin-resistance gene. An appropriate clone was chosen after G418 selection. This cell line was then transfected with a plasmid containing the full length TACI cDNA under control of the CMV promoter (TACI/pZP7P) and a puromycin-resistant gene. Clones were selected with puromycin and then an appropriate cell line chosen for the assay by assessing for TACI expression by flow cytometry using TACI monoclonal antibodies.

[0183]The assay is based on recording the readout of the luciferase gene expression that is triggered by the binding of the test ligand (HT or homotrimeric BLyS or homotrimeric APRIL) to cell surface TACI produced by from the TACI cDNA.

[0184]The transfected Jurkat cells were propagated in RPMI 1640 media without phenol red (Rosewell Park Memorial Institute, Buffalo, N.Y.) with 10% FBS added. Puromycin was added at 2 μg/ml as a selective reagent for the transfection. Sodium pyruvate and L-glutamine were also added to the media at 1% volume. Steady-Glo Luciferase Assay System (Promega, Madison, Wis. #E2510) substrate and assay buffer were used according to manufacturer's instructions.

[0185]The assay was performed by resuspending transfected Jurkat cells in media to 1.6×106 cell/ml. Cells are plated on a white assay plate with 50μ\per well. Samples of ZZ-APRIL were brought to appropriate dilution and placed into a 96 well plate. Dilutions were added to the cells, at 50μλ per well. The plate was included 4 hrs in a 37° incubator. During incubation, the Steady-GLO buffer and substrate was equilibrated to room temperature. After the 4 hr. incubation, the plate was allowed to cool at room temperature for 5 minutes. Assay buffer and substrate were mixed together and added at 100 μl per well. The plates were vortexed at low setting for 1 minute to mix, then incubated at room temperature for 10 minutes. The plate was then read on a luminometer with 5 second integration.

Sequence CWU 1

2611377DNAhomo sapiensCDS(14)...(892) 1agcatcctga gta atg agt ggc ctg ggc cgg agc agg cga ggt ggc cgg 49Met Ser Gly Leu Gly Arg Ser Arg Arg Gly Gly Arg1 5 10agc cgt gtg gac cag gag gag cgc ttt cca cag ggc ctg tgg acg ggg 97Ser Arg Val Asp Gln Glu Glu Arg Phe Pro Gln Gly Leu Trp Thr Gly 15 20 25gtg gct atg aga tcc tgc ccc gaa gag cag tac tgg gat cct ctg ctg 145Val Ala Met Arg Ser Cys Pro Glu Glu Gln Tyr Trp Asp Pro Leu Leu 30 35 40ggt acc tgc atg tcc tgc aaa acc att tgc aac cat cag agc cag cgc 193Gly Thr Cys Met Ser Cys Lys Thr Ile Cys Asn His Gln Ser Gln Arg45 50 55 60acc tgt gca gcc ttc tgc agg tca ctc agc tgc cgc aag gag caa ggc 241Thr Cys Ala Ala Phe Cys Arg Ser Leu Ser Cys Arg Lys Glu Gln Gly 65 70 75aag ttc tat gac cat ctc ctg agg gac tgc atc agc tgt gcc tcc atc 289Lys Phe Tyr Asp His Leu Leu Arg Asp Cys Ile Ser Cys Ala Ser Ile 80 85 90tgt gga cag cac cct aag caa tgt gca tac ttc tgt gag aac aag ctc 337Cys Gly Gln His Pro Lys Gln Cys Ala Tyr Phe Cys Glu Asn Lys Leu 95 100 105agg agc cca gtg aac ctt cca cca gag ctc agg aga cag cgg agt gga 385Arg Ser Pro Val Asn Leu Pro Pro Glu Leu Arg Arg Gln Arg Ser Gly 110 115 120gaa gtt gaa aac aat tca gac aac tcg gga agg tac caa gga ttg gag 433Glu Val Glu Asn Asn Ser Asp Asn Ser Gly Arg Tyr Gln Gly Leu Glu125 130 135 140cac aga ggc tca gaa gca agt cca gct ctc ccg ggg ctg aag ctg agt 481His Arg Gly Ser Glu Ala Ser Pro Ala Leu Pro Gly Leu Lys Leu Ser 145 150 155gca gat cag gtg gcc ctg gtc tac agc acg ctg ggg ctc tgc ctg tgt 529Ala Asp Gln Val Ala Leu Val Tyr Ser Thr Leu Gly Leu Cys Leu Cys 160 165 170gcc gtc ctc tgc tgc ttc ctg gtg gcg gtg gcc tgc ttc ctc aag aag 577Ala Val Leu Cys Cys Phe Leu Val Ala Val Ala Cys Phe Leu Lys Lys 175 180 185agg ggg gat ccc tgc tcc tgc cag ccc cgc tca agg ccc cgt caa agt 625Arg Gly Asp Pro Cys Ser Cys Gln Pro Arg Ser Arg Pro Arg Gln Ser 190 195 200ccg gcc aag tct tcc cag gat cac gcg atg gaa gcc ggc agc cct gtg 673Pro Ala Lys Ser Ser Gln Asp His Ala Met Glu Ala Gly Ser Pro Val205 210 215 220agc aca tcc ccc gag cca gtg gag acc tgc agc ttc tgc ttc cct gag 721Ser Thr Ser Pro Glu Pro Val Glu Thr Cys Ser Phe Cys Phe Pro Glu 225 230 235tgc agg gcg ccc acg cag gag agc gca gtc acg cct ggg acc ccc gac 769Cys Arg Ala Pro Thr Gln Glu Ser Ala Val Thr Pro Gly Thr Pro Asp 240 245 250ccc act tgt gct gga agg tgg ggg tgc cac acc agg acc aca gtc ctg 817Pro Thr Cys Ala Gly Arg Trp Gly Cys His Thr Arg Thr Thr Val Leu 255 260 265cag cct tgc cca cac atc cca gac agt ggc ctt ggc att gtg tgt gtg 865Gln Pro Cys Pro His Ile Pro Asp Ser Gly Leu Gly Ile Val Cys Val 270 275 280cct gcc cag gag ggg ggc cca ggt gca taaatggggg tcagggaggg 912Pro Ala Gln Glu Gly Gly Pro Gly Ala285 290aaaggaggag ggagagagat ggagaggagg ggagagagaa agagaggtgg ggagagggga 972gagagatatg aggagagaga gacagaggag gcagaaaggg agagaaacag aggagacaga 1032gagggagaga gagacagagg gagagagaga cagaggggaa gagaggcaga gagggaaaga 1092ggcagagaag gaaagagaca ggcagagaag gagagaggca gagagggaga gaggcagaga 1152gggagagagg cagagagaca gagagggaga gagggacaga gagagataga gcaggaggtc 1212ggggcactct gagtcccagt tcccagtgca gctgtaggtc gtcatcacct aaccacacgt 1272gcaataaagt cctcgtgcct gctgctcaca gcccccgaga gcccctcctc ctggagaata 1332aaacctttgg cagctgccct tcctcaaaaa aaaaaaaaaa aaaaa 13772293PRThomo sapiens 2Met Ser Gly Leu Gly Arg Ser Arg Arg Gly Gly Arg Ser Arg Val Asp1 5 10 15Gln Glu Glu Arg Phe Pro Gln Gly Leu Trp Thr Gly Val Ala Met Arg 20 25 30Ser Cys Pro Glu Glu Gln Tyr Trp Asp Pro Leu Leu Gly Thr Cys Met 35 40 45Ser Cys Lys Thr Ile Cys Asn His Gln Ser Gln Arg Thr Cys Ala Ala 50 55 60Phe Cys Arg Ser Leu Ser Cys Arg Lys Glu Gln Gly Lys Phe Tyr Asp65 70 75 80His Leu Leu Arg Asp Cys Ile Ser Cys Ala Ser Ile Cys Gly Gln His 85 90 95Pro Lys Gln Cys Ala Tyr Phe Cys Glu Asn Lys Leu Arg Ser Pro Val 100 105 110Asn Leu Pro Pro Glu Leu Arg Arg Gln Arg Ser Gly Glu Val Glu Asn 115 120 125Asn Ser Asp Asn Ser Gly Arg Tyr Gln Gly Leu Glu His Arg Gly Ser 130 135 140Glu Ala Ser Pro Ala Leu Pro Gly Leu Lys Leu Ser Ala Asp Gln Val145 150 155 160Ala Leu Val Tyr Ser Thr Leu Gly Leu Cys Leu Cys Ala Val Leu Cys 165 170 175Cys Phe Leu Val Ala Val Ala Cys Phe Leu Lys Lys Arg Gly Asp Pro 180 185 190Cys Ser Cys Gln Pro Arg Ser Arg Pro Arg Gln Ser Pro Ala Lys Ser 195 200 205Ser Gln Asp His Ala Met Glu Ala Gly Ser Pro Val Ser Thr Ser Pro 210 215 220Glu Pro Val Glu Thr Cys Ser Phe Cys Phe Pro Glu Cys Arg Ala Pro225 230 235 240Thr Gln Glu Ser Ala Val Thr Pro Gly Thr Pro Asp Pro Thr Cys Ala 245 250 255Gly Arg Trp Gly Cys His Thr Arg Thr Thr Val Leu Gln Pro Cys Pro 260 265 270His Ile Pro Asp Ser Gly Leu Gly Ile Val Cys Val Pro Ala Gln Glu 275 280 285Gly Gly Pro Gly Ala 2903586DNAhomo sapiensCDS(27)...(578) 3gcagcttgtg cggcggcgtc ggcacc atg agg cga ggg ccc cgg agc ctg cgg 53Met Arg Arg Gly Pro Arg Ser Leu Arg1 5ggc agg gac gcg cca gcc ccc acg ccc tgc gtc ccg gcc gag tgc ttc 101Gly Arg Asp Ala Pro Ala Pro Thr Pro Cys Val Pro Ala Glu Cys Phe10 15 20 25gac ctg ctg gtc cgc cac tgc gtg gcc tgc ggg ctc ctg cgc acg ccg 149Asp Leu Leu Val Arg His Cys Val Ala Cys Gly Leu Leu Arg Thr Pro 30 35 40cgg ccg aaa ccg gcc ggg gcc agc agc cct gcg ccc agg acg gcg ctg 197Arg Pro Lys Pro Ala Gly Ala Ser Ser Pro Ala Pro Arg Thr Ala Leu 45 50 55cag ccg cag gag tcg gtg ggc gcg ggg gcc ggc gag gcg gcg ctg ccc 245Gln Pro Gln Glu Ser Val Gly Ala Gly Ala Gly Glu Ala Ala Leu Pro 60 65 70ctg ccc ggg ctg ctc ttt ggc gcc ccc gcg ctg ctg ggc ctg gca ctg 293Leu Pro Gly Leu Leu Phe Gly Ala Pro Ala Leu Leu Gly Leu Ala Leu 75 80 85gtc ctg gcg ctg gtc ctg gtg ggt ctg gtg agc tgg agg cgg cga cag 341Val Leu Ala Leu Val Leu Val Gly Leu Val Ser Trp Arg Arg Arg Gln90 95 100 105cgg cgg ctt cgc ggc gcg tcc tcc gca gag gcc ccc gac gga gac aag 389Arg Arg Leu Arg Gly Ala Ser Ser Ala Glu Ala Pro Asp Gly Asp Lys 110 115 120gac gcc cca gag ccc ctg gac aag gtc atc att ctg tct ccg gga atc 437Asp Ala Pro Glu Pro Leu Asp Lys Val Ile Ile Leu Ser Pro Gly Ile 125 130 135tct gat gcc aca gct cct gcc tgg cct cct cct ggg gaa gac cca gga 485Ser Asp Ala Thr Ala Pro Ala Trp Pro Pro Pro Gly Glu Asp Pro Gly 140 145 150acc acc cca cct ggc cac agt gtc cct gtg cca gcc aca gag ctg ggc 533Thr Thr Pro Pro Gly His Ser Val Pro Val Pro Ala Thr Glu Leu Gly 155 160 165tcc act gaa ctg gtg acc acc aag acg gcc ggc cct gag caa caa 578Ser Thr Glu Leu Val Thr Thr Lys Thr Ala Gly Pro Glu Gln Gln170 175 180tagcaggg 5864184PRThomo sapiens 4Met Arg Arg Gly Pro Arg Ser Leu Arg Gly Arg Asp Ala Pro Ala Pro1 5 10 15Thr Pro Cys Val Pro Ala Glu Cys Phe Asp Leu Leu Val Arg His Cys 20 25 30Val Ala Cys Gly Leu Leu Arg Thr Pro Arg Pro Lys Pro Ala Gly Ala 35 40 45Ser Ser Pro Ala Pro Arg Thr Ala Leu Gln Pro Gln Glu Ser Val Gly 50 55 60Ala Gly Ala Gly Glu Ala Ala Leu Pro Leu Pro Gly Leu Leu Phe Gly65 70 75 80Ala Pro Ala Leu Leu Gly Leu Ala Leu Val Leu Ala Leu Val Leu Val 85 90 95 Gly Leu Val Ser Trp Arg Arg Arg Gln Arg Arg Leu Arg Gly Ala Ser 100 105 110Ser Ala Glu Ala Pro Asp Gly Asp Lys Asp Ala Pro Glu Pro Leu Asp 115 120 125Lys Val Ile Ile Leu Ser Pro Gly Ile Ser Asp Ala Thr Ala Pro Ala 130 135 140Trp Pro Pro Pro Gly Glu Asp Pro Gly Thr Thr Pro Pro Gly His Ser145 150 155 160Val Pro Val Pro Ala Thr Glu Leu Gly Ser Thr Glu Leu Val Thr Thr 165 170 175 Lys Thr Ala Gly Pro Glu Gln Gln 1805995DNAhomo sapiensCDS(219)...(770) 5aagactcaaa cttagaaact tgaattagat gtggtattca aatccttacg tgccgcgaag 60acacagacag cccccgtaag aacccacgaa gcaggcgaag ttcattgttc tcaacattct 120agctgctctt gctgcatttg ctctggaatt cttgtagaga tattacttgt ccttccaggc 180tgttctttct gtagctccct tgttttcttt ttgtgatc atg ttg cag atg gct ggg 236Met Leu Gln Met Ala Gly1 5cag tgc tcc caa aat gaa tat ttt gac agt ttg ttg cat gct tgc ata 284Gln Cys Ser Gln Asn Glu Tyr Phe Asp Ser Leu Leu His Ala Cys Ile 10 15 20cct tgt caa ctt cga tgt tct tct aat act cct cct cta aca tgt cag 332Pro Cys Gln Leu Arg Cys Ser Ser Asn Thr Pro Pro Leu Thr Cys Gln 25 30 35cgt tat tgt aat gca agt gtg acc aat tca gtg aaa gga acg aat gcg 380Arg Tyr Cys Asn Ala Ser Val Thr Asn Ser Val Lys Gly Thr Asn Ala 40 45 50att ctc tgg acc tgt ttg gga ctg agc tta ata att tct ttg gca gtt 428Ile Leu Trp Thr Cys Leu Gly Leu Ser Leu Ile Ile Ser Leu Ala Val55 60 65 70ttc gtg cta atg ttt ttg cta agg aag ata agc tct gaa cca tta aag 476Phe Val Leu Met Phe Leu Leu Arg Lys Ile Ser Ser Glu Pro Leu Lys 75 80 85gac gag ttt aaa aac aca gga tca ggt ctc ctg ggc atg gct aac att 524Asp Glu Phe Lys Asn Thr Gly Ser Gly Leu Leu Gly Met Ala Asn Ile 90 95 100gac ctg gaa aag agc agg act ggt gat gaa att att ctt ccg aga ggc 572Asp Leu Glu Lys Ser Arg Thr Gly Asp Glu Ile Ile Leu Pro Arg Gly 105 110 115ctc gag tac acg gtg gaa gaa tgc acc tgt gaa gac tgc atc aag agc 620Leu Glu Tyr Thr Val Glu Glu Cys Thr Cys Glu Asp Cys Ile Lys Ser 120 125 130aaa ccg aag gtc gac tct gac cat tgc ttt cca ctc cca gct atg gag 668Lys Pro Lys Val Asp Ser Asp His Cys Phe Pro Leu Pro Ala Met Glu135 140 145 150gaa ggc gca acc att ctt gtc acc acg aaa acg aat gac tat tgc aag 716Glu Gly Ala Thr Ile Leu Val Thr Thr Lys Thr Asn Asp Tyr Cys Lys 155 160 165 agc ctg cca gct gct ttg agt gct acg gag ata gag aaa tca att tct 764Ser Leu Pro Ala Ala Leu Ser Ala Thr Glu Ile Glu Lys Ser Ile Ser 170 175 180gct agg taattaacca tttcgactcg agcagtgcca ctttaaaaat cttttgtcag 820Ala Argaatagatgat gtgtcagatc tctttaggat gactgtattt ttcagttgcc gatacagctt 880tttgtcctct aactgtggaa actctttatg ttagatatat ttctctaggt tactgttggg 940agcttaatgg tagaaacttc cttggtttca tgattaaagt cttttttttt cctga 9956184PRThomo sapiens 6Met Leu Gln Met Ala Gly Gln Cys Ser Gln Asn Glu Tyr Phe Asp Ser1 5 10 15Leu Leu His Ala Cys Ile Pro Cys Gln Leu Arg Cys Ser Ser Asn Thr 20 25 30Pro Pro Leu Thr Cys Gln Arg Tyr Cys Asn Ala Ser Val Thr Asn Ser 35 40 45Val Lys Gly Thr Asn Ala Ile Leu Trp Thr Cys Leu Gly Leu Ser Leu 50 55 60Ile Ile Ser Leu Ala Val Phe Val Leu Met Phe Leu Leu Arg Lys Ile65 70 75 80Ser Ser Glu Pro Leu Lys Asp Glu Phe Lys Asn Thr Gly Ser Gly Leu 85 90 95Leu Gly Met Ala Asn Ile Asp Leu Glu Lys Ser Arg Thr Gly Asp Glu 100 105 110Ile Ile Leu Pro Arg Gly Leu Glu Tyr Thr Val Glu Glu Cys Thr Cys 115 120 125Glu Asp Cys Ile Lys Ser Lys Pro Lys Val Asp Ser Asp His Cys Phe 130 135 140Pro Leu Pro Ala Met Glu Glu Gly Ala Thr Ile Leu Val Thr Thr Lys145 150 155 160Thr Asn Asp Tyr Cys Lys Ser Leu Pro Ala Ala Leu Ser Ala Thr Glu 165 170 175Ile Glu Lys Ser Ile Ser Ala Arg 18071149DNAhomo sapiensCDS(173)...(1023) 7gaattcggca cgaggcagaa aggagaaaat tcaggataac tctcctgagg ggtgagccaa 60gccctgccat gtagtgcacg caggacatca acaaacacag ataacaggaa atgatccatt 120ccctgtggtc acttattcta aaggccccaa ccttcaaagt tcaagtagtg at atg gat 178Met Asp1gac tcc aca gaa agg gag cag tca cgc ctt act tct tgc ctt aag aaa 226Asp Ser Thr Glu Arg Glu Gln Ser Arg Leu Thr Ser Cys Leu Lys Lys 5 10 15aga gaa gaa atg aaa ctg aag gag tgt gtt tcc atc ctc cca cgg aag 274Arg Glu Glu Met Lys Leu Lys Glu Cys Val Ser Ile Leu Pro Arg Lys 20 25 30gaa agc ccc tct gtc cga tcc tcc aaa gac gga aag ctg ctg gct gca 322Glu Ser Pro Ser Val Arg Ser Ser Lys Asp Gly Lys Leu Leu Ala Ala35 40 45 50acc ttg ctg ctg gca ctg ctg tct tgc tgc ctc acg gtg gtg tct ttc 370Thr Leu Leu Leu Ala Leu Leu Ser Cys Cys Leu Thr Val Val Ser Phe 55 60 65tac cag gtg gcc gcc ctg caa ggg gac ctg gcc agc ctc cgg gca gag 418Tyr Gln Val Ala Ala Leu Gln Gly Asp Leu Ala Ser Leu Arg Ala Glu 70 75 80ctg cag ggc cac cac gcg gag aag ctg cca gca gga gca gga gcc ccc 466Leu Gln Gly His His Ala Glu Lys Leu Pro Ala Gly Ala Gly Ala Pro 85 90 95aag gcc ggc ctg gag gaa gct cca gct gtc acc gcg gga ctg aaa atc 514Lys Ala Gly Leu Glu Glu Ala Pro Ala Val Thr Ala Gly Leu Lys Ile 100 105 110ttt gaa cca cca gct cca gga gaa ggc aac tcc agt cag aac agc aga 562Phe Glu Pro Pro Ala Pro Gly Glu Gly Asn Ser Ser Gln Asn Ser Arg115 120 125 130aat aag cgt gcc gtt cag ggt cca gaa gaa aca gtc act caa gac tgc 610Asn Lys Arg Ala Val Gln Gly Pro Glu Glu Thr Val Thr Gln Asp Cys 135 140 145ttg caa ctg att gca gac agt gaa aca cca act ata caa aaa gga tct 658Leu Gln Leu Ile Ala Asp Ser Glu Thr Pro Thr Ile Gln Lys Gly Ser 150 155 160tac aca ttt gtt cca tgg ctt ctc agc ttt aaa agg gga agt gcc cta 706Tyr Thr Phe Val Pro Trp Leu Leu Ser Phe Lys Arg Gly Ser Ala Leu 165 170 175gaa gaa aaa gag aat aaa ata ttg gtc aaa gaa act ggt tac ttt ttt 754Glu Glu Lys Glu Asn Lys Ile Leu Val Lys Glu Thr Gly Tyr Phe Phe 180 185 190ata tat ggt cag gtt tta tat act gat aag acc tac gcc atg gga cat 802Ile Tyr Gly Gln Val Leu Tyr Thr Asp Lys Thr Tyr Ala Met Gly His195 200 205 210cta att cag agg aag aag gtc cat gtc ttt ggg gat gaa ttg agt ctg 850Leu Ile Gln Arg Lys Lys Val His Val Phe Gly Asp Glu Leu Ser Leu 215 220 225gtg act ttg ttt cga tgt att caa aat atg cct gaa aca cta ccc aat 898Val Thr Leu Phe Arg Cys Ile Gln Asn Met Pro Glu Thr Leu Pro Asn 230 235 240aat tcc tgc tat tca gct ggc att gca aaa ctg gaa gaa gga gat gaa 946Asn Ser Cys Tyr Ser Ala Gly Ile Ala Lys Leu Glu Glu Gly Asp Glu 245 250 255ctc caa ctt gca ata cca aga gaa aat gca caa ata tca ctg gat gga 994Leu Gln Leu Ala Ile Pro Arg Glu Asn Ala Gln Ile Ser Leu Asp Gly 260 265 270gat gtc aca ttt ttt ggt gca ttg aaa ct gctgtgacct acttacacca 1043Asp Val Thr Phe Phe Gly Ala Leu Lys275 280tgtctgtagc tattttcctc cctttctctg tacctctaag aagaaagaat ctaactgaaa 1103ataccaaaaa aaaaaaaaaa aaaaaaaaaa ccctcgagcg gccgcc 11498283PRThomo sapiens 8Met Asp Asp Ser Thr Glu Arg Glu Gln Ser Arg Leu Thr Ser Cys Leu1 5 10 15Lys Lys Arg Glu Glu Met Lys Leu Lys Glu Cys Val Ser Ile Leu Pro 20 25 30Arg Lys Glu Ser Pro Ser Val Arg Ser Ser Lys Asp Gly Lys Leu Leu 35 40 45Ala Ala Thr Leu Leu Leu Ala

Leu Leu Ser Cys Cys Leu Thr Val Val 50 55 60Ser Phe Tyr Gln Val Ala Ala Leu Gln Gly Asp Leu Ala Ser Leu Arg65 70 75 80Ala Glu Leu Gln Gly His His Ala Glu Lys Leu Pro Ala Gly Ala Gly 85 90 95Ala Pro Lys Ala Gly Leu Glu Glu Ala Pro Ala Val Thr Ala Gly Leu 100 105 110Lys Ile Phe Glu Pro Pro Ala Pro Gly Glu Gly Asn Ser Ser Gln Asn 115 120 125Ser Arg Asn Lys Arg Ala Val Gln Gly Pro Glu Glu Thr Val Thr Gln 130 135 140Asp Cys Leu Gln Leu Ile Ala Asp Ser Glu Thr Pro Thr Ile Gln Lys145 150 155 160Gly Ser Tyr Thr Phe Val Pro Trp Leu Leu Ser Phe Lys Arg Gly Ser 165 170 175Ala Leu Glu Glu Lys Glu Asn Lys Ile Leu Val Lys Glu Thr Gly Tyr 180 185 190Phe Phe Ile Tyr Gly Gln Val Leu Tyr Thr Asp Lys Thr Tyr Ala Met 195 200 205Gly His Leu Ile Gln Arg Lys Lys Val His Val Phe Gly Asp Glu Leu 210 215 220Ser Leu Val Thr Leu Phe Arg Cys Ile Gln Asn Met Pro Glu Thr Leu225 230 235 240Pro Asn Asn Ser Cys Tyr Ser Ala Gly Ile Ala Lys Leu Glu Glu Gly 245 250 255Asp Glu Leu Gln Leu Ala Ile Pro Arg Glu Asn Ala Gln Ile Ser Leu 260 265 270Asp Gly Asp Val Thr Phe Phe Gly Ala Leu Lys 275 2809185PRThomo sapiens 9Met Arg Arg Gly Pro Arg Ser Leu Arg Gly Arg Asp Ala Pro Ala Pro1 5 10 15Thr Pro Cys Val Pro Ala Glu Cys Phe Asp Leu Leu Val Arg His Cys 20 25 30Val Ala Cys Gly Leu Leu Arg Thr Pro Arg Pro Lys Pro Ala Gly Ala 35 40 45Ala Ser Ser Pro Ala Pro Arg Thr Ala Leu Gln Pro Gln Glu Ser Val 50 55 60Gly Ala Gly Ala Gly Glu Ala Ala Leu Pro Leu Pro Gly Leu Leu Phe65 70 75 80Gly Ala Pro Ala Leu Leu Gly Leu Ala Leu Val Leu Ala Leu Val Leu 85 90 95Val Gly Leu Val Ser Trp Arg Arg Arg Gln Arg Arg Leu Arg Gly Ala 100 105 110Ser Ser Ala Glu Ala Pro Asp Gly Asp Lys Asp Ala Pro Glu Pro Leu 115 120 125Asp Lys Val Ile Ile Leu Ser Pro Gly Ile Ser Asp Ala Thr Ala Pro 130 135 140Ala Trp Pro Pro Pro Gly Glu Asp Pro Gly Thr Thr Pro Pro Gly His145 150 155 160Ser Val Pro Val Pro Ala Thr Glu Leu Gly Ser Thr Glu Leu Val Thr 165 170 175Thr Lys Thr Ala Gly Pro Glu Gln Gln 180 18510247PRThomo sapiens 10Met Ser Gly Leu Gly Arg Ser Arg Arg Gly Gly Arg Ser Arg Val Asp1 5 10 15Gln Glu Glu Arg Trp Ser Leu Ser Cys Arg Lys Glu Gln Gly Lys Phe 20 25 30Tyr Asp His Leu Leu Arg Asp Cys Ile Ser Cys Ala Ser Ile Cys Gly 35 40 45Gln His Pro Lys Gln Cys Ala Tyr Phe Cys Glu Asn Lys Leu Arg Ser 50 55 60Pro Val Asn Leu Pro Pro Glu Leu Arg Arg Gln Arg Ser Gly Glu Val65 70 75 80Glu Asn Asn Ser Asp Asn Ser Gly Arg Tyr Gln Gly Leu Glu His Arg 85 90 95Gly Ser Glu Ala Ser Pro Ala Leu Pro Gly Leu Lys Leu Ser Ala Asp 100 105 110Gln Val Ala Leu Val Tyr Ser Thr Leu Gly Leu Cys Leu Cys Ala Val 115 120 125Leu Cys Cys Phe Leu Val Ala Val Ala Cys Phe Leu Lys Lys Arg Gly 130 135 140Asp Pro Cys Ser Cys Gln Pro Arg Ser Arg Pro Arg Gln Ser Pro Ala145 150 155 160Lys Ser Ser Gln Asp His Ala Met Glu Ala Gly Ser Pro Val Ser Thr 165 170 175Ser Pro Glu Pro Val Glu Thr Cys Ser Phe Cys Phe Pro Glu Cys Arg 180 185 190Ala Pro Thr Gln Glu Ser Ala Val Thr Pro Gly Thr Pro Asp Pro Thr 195 200 205Cys Ala Gly Arg Trp Gly Cys His Thr Arg Thr Thr Val Leu Gln Pro 210 215 220Cys Pro His Ile Pro Asp Ser Gly Leu Gly Ile Val Cys Val Pro Ala225 230 235 240Gln Glu Gly Gly Pro Gly Ala 2451117PRTArtificial SequenceBLyS binding polypeptide 11Glu Cys Phe Asp Leu Leu Val Arg Ala Trp Val Pro Cys Ser Val Leu1 5 10 15Lys1217PRTArtificial SequenceBLyS binding polypeptide 12Glu Cys Phe Asp Leu Leu Val Arg Ala Trp Val Pro Cys Ser Val Leu1 5 10 15Lys1317PRTArtificial SequenceBLyS binding polypeptide 13Glu Cys Phe Asp Leu Leu Val Arg Arg Trp Val Pro Cys Glu Met Leu1 5 10 15Gly1417PRTArtificial SequenceBLyS binding polypeptide 14Glu Cys Phe Asp Leu Leu Val Arg Ser Trp Val Pro Cys His Met Leu1 5 10 15Arg1517PRTArtificial SequenceBLyS binding polypeptide 15Glu Cys Phe Asp Leu Leu Val Arg His Trp Val Ala Cys Gly Leu Leu1 5 10 15Arg161214DNAArtificial SequenceTACI-Fc fusion protein 16tattaggccg gccacc atg gat gca atg aag aga ggg ctc tgc tgt gtg ctg 52Met Asp Ala Met Lys Arg Gly Leu Cys Cys Val Leu1 5 10ctg ctg tgt ggc gcc gtc ttc gtt tcg ctc agc cag gaa atc cat gcc 100Leu Leu Cys Gly Ala Val Phe Val Ser Leu Ser Gln Glu Ile His Ala 15 20 25gag ttg aga cgc ttc cgt aga gct atg aga tcc tgc ccc gaa gag cag 148Glu Leu Arg Arg Phe Arg Arg Ala Met Arg Ser Cys Pro Glu Glu Gln 30 35 40tac tgg gat cct ctg ctg ggt acc tgc atg tcc tgc aaa acc att tgc 196Tyr Trp Asp Pro Leu Leu Gly Thr Cys Met Ser Cys Lys Thr Ile Cys45 50 55 60aac cat cag agc cag cgc acc tgt gca gcc ttc tgc agg tca ctc agc 244Asn His Gln Ser Gln Arg Thr Cys Ala Ala Phe Cys Arg Ser Leu Ser 65 70 75tgc cgc aag gag caa ggc aag ttc tat gac cat ctc ctg agg gac tgc 292Cys Arg Lys Glu Gln Gly Lys Phe Tyr Asp His Leu Leu Arg Asp Cys 80 85 90atc agc tgt gcc tcc atc tgt gga cag cac cct aag caa tgt gca tac 340Ile Ser Cys Ala Ser Ile Cys Gly Gln His Pro Lys Gln Cys Ala Tyr 95 100 105ttc tgt gag aac aag ctc agg agc cca gtg aac ctt cca cca gag ctc 388Phe Cys Glu Asn Lys Leu Arg Ser Pro Val Asn Leu Pro Pro Glu Leu 110 115 120agg aga cag cgg agt gga gaa gtt gaa aac aat tca gac aac tcg gga 436Arg Arg Gln Arg Ser Gly Glu Val Glu Asn Asn Ser Asp Asn Ser Gly125 130 135 140agg tac caa gga ttg gag cac aga ggc tca gaa gca agt cca gct ctc 484Arg Tyr Gln Gly Leu Glu His Arg Gly Ser Glu Ala Ser Pro Ala Leu 145 150 155cca ggt ctc aag gag ccc aaa tct tca gac aaa act cac aca tgc cca 532Pro Gly Leu Lys Glu Pro Lys Ser Ser Asp Lys Thr His Thr Cys Pro 160 165 170ccg tgc cca gca cct gaa gcc gag ggg gca ccg tca gtc ttc ctc ttc 580Pro Cys Pro Ala Pro Glu Ala Glu Gly Ala Pro Ser Val Phe Leu Phe 175 180 185ccc cca aaa ccc aag gac acc ctc atg atc tcc cgg acc cct gag gtc 628Pro Pro Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val 190 195 200aca tgc gtg gtg gtg gac gtg agc cac gaa gac cct gag gtc aag ttc 676Thr Cys Val Val Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe205 210 215 220aac tgg tac gtg gac ggc gtg gag gtg cat aat gcc aag aca aag ccg 724Asn Trp Tyr Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro 225 230 235cgg gag gag cag tac aac agc acg tac cgt gtg gtc agc gtc ctc acc 772Arg Glu Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr 240 245 250gtc ctg cac cag gac tgg ctg aat ggc aag gag tac aag tgc aag gtc 820Val Leu His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val 255 260 265tcc aac aaa gcc ctc cca tcc tcc atc gag aaa acc atc tcc aaa gcc 868Ser Asn Lys Ala Leu Pro Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala 270 275 280aaa ggg cag ccc cga gaa cca cag gtg tac acc ctg ccc cca tcc cgg 916Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg285 290 295 300gat gag ctg acc aag aac cag gtc agc ctg acc tgc ctg gtc aaa ggc 964Asp Glu Leu Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly 305 310 315ttc tat ccc agc gac atc gcc gtg gag tgg gag agc aat ggg cag ccg 1012Phe Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro 320 325 330gag aac aac tac aag acc acg cct ccc gtg ctg gac tcc gac ggc tcc 1060Glu Asn Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser 335 340 345ttc ttc ctc tac agc aag ctc acc gtg gac aag agc agg tgg cag cag 1108Phe Phe Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln 350 355 360ggg aac gtc ttc tca tgc tcc gtg atg cat gag gct ctg cac aac cac 1156Gly Asn Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His365 370 375 380tac acg cag aag agc ctc tcc ctg tct ccg ggt aaa taatctagag 1202Tyr Thr Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 385 390gcgcgccaat ta 121417392PRTArtificial SequenceTACI-Fc fusion protein 17Met Asp Ala Met Lys Arg Gly Leu Cys Cys Val Leu Leu Leu Cys Gly1 5 10 15Ala Val Phe Val Ser Leu Ser Gln Glu Ile His Ala Glu Leu Arg Arg 20 25 30Phe Arg Arg Ala Met Arg Ser Cys Pro Glu Glu Gln Tyr Trp Asp Pro 35 40 45Leu Leu Gly Thr Cys Met Ser Cys Lys Thr Ile Cys Asn His Gln Ser 50 55 60Gln Arg Thr Cys Ala Ala Phe Cys Arg Ser Leu Ser Cys Arg Lys Glu65 70 75 80Gln Gly Lys Phe Tyr Asp His Leu Leu Arg Asp Cys Ile Ser Cys Ala 85 90 95Ser Ile Cys Gly Gln His Pro Lys Gln Cys Ala Tyr Phe Cys Glu Asn 100 105 110Lys Leu Arg Ser Pro Val Asn Leu Pro Pro Glu Leu Arg Arg Gln Arg 115 120 125Ser Gly Glu Val Glu Asn Asn Ser Asp Asn Ser Gly Arg Tyr Gln Gly 130 135 140Leu Glu His Arg Gly Ser Glu Ala Ser Pro Ala Leu Pro Gly Leu Lys145 150 155 160Glu Pro Lys Ser Ser Asp Lys Thr His Thr Cys Pro Pro Cys Pro Ala 165 170 175Pro Glu Ala Glu Gly Ala Pro Ser Val Phe Leu Phe Pro Pro Lys Pro 180 185 190Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val 195 200 205Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val 210 215 220Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln225 230 235 240Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln 245 250 255Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala 260 265 270Leu Pro Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro 275 280 285Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Asp Glu Leu Thr 290 295 300Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser305 310 315 320Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr 325 330 335Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr 340 345 350Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe 355 360 365Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys 370 375 380Ser Leu Ser Leu Ser Pro Gly Lys385 390181070DNAArtificial SequenceTACI-Fc fusion protein 18tattaggccg gccacc atg gat gca atg aag aga ggg ctc tgc tgt gtg ctg 52Met Asp Ala Met Lys Arg Gly Leu Cys Cys Val Leu1 5 10ctg ctg tgt ggc gcc gtc ttc gtt tcg ctc agc cag gaa atc cat gcc 100Leu Leu Cys Gly Ala Val Phe Val Ser Leu Ser Gln Glu Ile His Ala 15 20 25gag ttg aga cgc ttc cgt aga gct atg aga tcc tgc ccc gaa gag cag 148Glu Leu Arg Arg Phe Arg Arg Ala Met Arg Ser Cys Pro Glu Glu Gln 30 35 40 tac tgg gat cct ctg ctg ggt acc tgc atg tcc tgc aaa acc att tgc 196Tyr Trp Asp Pro Leu Leu Gly Thr Cys Met Ser Cys Lys Thr Ile Cys45 50 55 60aac cat cag agc cag cgc acc tgt gca gcc ttc tgc agg tca ctc agc 244Asn His Gln Ser Gln Arg Thr Cys Ala Ala Phe Cys Arg Ser Leu Ser 65 70 75tgc cgc aag gag caa ggc aag ttc tat gac cat ctc ctg agg gac tgc 292Cys Arg Lys Glu Gln Gly Lys Phe Tyr Asp His Leu Leu Arg Asp Cys 80 85 90atc agc tgt gcc tcc atc tgt gga cag cac cct aag caa tgt gca tac 340Ile Ser Cys Ala Ser Ile Cys Gly Gln His Pro Lys Gln Cys Ala Tyr 95 100 105ttc tgt gag aac gag ccc aaa tct tca gac aaa act cac aca tgc cca 388Phe Cys Glu Asn Glu Pro Lys Ser Ser Asp Lys Thr His Thr Cys Pro 110 115 120ccg tgc cca gca cct gaa gcc gag ggg gca ccg tca gtc ttc ctc ttc 436Pro Cys Pro Ala Pro Glu Ala Glu Gly Ala Pro Ser Val Phe Leu Phe125 130 135 140ccc cca aaa ccc aag gac acc ctc atg atc tcc cgg acc cct gag gtc 484Pro Pro Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val 145 150 155aca tgc gtg gtg gtg gac gtg agc cac gaa gac cct gag gtc aag ttc 532Thr Cys Val Val Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe 160 165 170aac tgg tac gtg gac ggc gtg gag gtg cat aat gcc aag aca aag ccg 580Asn Trp Tyr Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro 175 180 185cgg gag gag cag tac aac agc acg tac cgt gtg gtc agc gtc ctc acc 628Arg Glu Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr 190 195 200gtc ctg cac cag gac tgg ctg aat ggc aag gag tac aag tgc aag gtc 676Val Leu His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val205 210 215 220tcc aac aaa gcc ctc cca tcc tcc atc gag aaa acc atc tcc aaa gcc 724Ser Asn Lys Ala Leu Pro Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala 225 230 235aaa ggg cag ccc cga gaa cca cag gtg tac acc ctg ccc cca tcc cgg 772Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg 240 245 250gat gag ctg acc aag aac cag gtc agc ctg acc tgc ctg gtc aaa ggc 820Asp Glu Leu Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly 255 260 265ttc tat ccc agc gac atc gcc gtg gag tgg gag agc aat ggg cag ccg 868Phe Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro 270 275 280gag aac aac tac aag acc acg cct ccc gtg ctg gac tcc gac ggc tcc 916Glu Asn Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser285 290 295 300ttc ttc ctc tac agc aag ctc acc gtg gac aag agc agg tgg cag cag 964Phe Phe Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln 305 310 315ggg aac gtc ttc tca tgc tcc gtg atg cat gag gct ctg cac aac cac 1012Gly Asn Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His 320 325 330tac acg cag aag agc ctc tcc ctg tct ccg ggt aaa taatctagag 1058Tyr Thr Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 335 340gcgcgccaat ta 1070 19344PRTArtificial SequenceTACI-Fc fusion protein 19Met Asp Ala Met Lys Arg Gly Leu Cys Cys Val Leu Leu Leu Cys Gly1 5 10 15Ala Val Phe Val Ser Leu Ser Gln Glu Ile His Ala Glu Leu Arg Arg 20 25 30Phe Arg Arg Ala Met Arg Ser Cys Pro Glu Glu Gln Tyr Trp Asp Pro 35 40 45Leu Leu Gly Thr Cys Met Ser Cys Lys Thr Ile Cys Asn His

Gln Ser 50 55 60Gln Arg Thr Cys Ala Ala Phe Cys Arg Ser Leu Ser Cys Arg Lys Glu65 70 75 80Gln Gly Lys Phe Tyr Asp His Leu Leu Arg Asp Cys Ile Ser Cys Ala 85 90 95Ser Ile Cys Gly Gln His Pro Lys Gln Cys Ala Tyr Phe Cys Glu Asn 100 105 110Glu Pro Lys Ser Ser Asp Lys Thr His Thr Cys Pro Pro Cys Pro Ala 115 120 125Pro Glu Ala Glu Gly Ala Pro Ser Val Phe Leu Phe Pro Pro Lys Pro 130 135 140Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val145 150 155 160Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val 165 170 175Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln 180 185 190Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln 195 200 205Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala 210 215 220Leu Pro Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro225 230 235 240Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Asp Glu Leu Thr 245 250 255Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser 260 265 270Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr 275 280 285Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr 290 295 300Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe305 310 315 320Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys 325 330 335Ser Leu Ser Leu Ser Pro Gly Lys 340201082DNAArtificial SequenceTACI-Fc fusion protein 20tattaggccg gccacc atg gat gca atg aag aga ggg ctc tgc tgt gtg ctg 52Met Asp Ala Met Lys Arg Gly Leu Cys Cys Val Leu1 5 10ctg ctg tgt ggc gcc gtc ttc gtt tcg ctc agc cag gaa atc cat gcc 100Leu Leu Cys Gly Ala Val Phe Val Ser Leu Ser Gln Glu Ile His Ala 15 20 25gag ttg aga cgc ttc cgt aga gct atg aga tcc tgc ccc gaa gag cag 148Glu Leu Arg Arg Phe Arg Arg Ala Met Arg Ser Cys Pro Glu Glu Gln 30 35 40tac tgg gat cct ctg ctg ggt acc tgc atg tcc tgc aaa acc att tgc 196Tyr Trp Asp Pro Leu Leu Gly Thr Cys Met Ser Cys Lys Thr Ile Cys45 50 55 60aac cat cag agc cag cgc acc tgt gca gcc ttc tgc agg tca ctc agc 244Asn His Gln Ser Gln Arg Thr Cys Ala Ala Phe Cys Arg Ser Leu Ser 65 70 75tgc cgc aag gag caa ggc aag ttc tat gac cat ctc ctg agg gac tgc 292Cys Arg Lys Glu Gln Gly Lys Phe Tyr Asp His Leu Leu Arg Asp Cys 80 85 90atc agc tgt gcc tcc atc tgt gga cag cac cct aag caa tgt gca tac 340Ile Ser Cys Ala Ser Ile Cys Gly Gln His Pro Lys Gln Cys Ala Tyr 95 100 105ttc tgt gag aac aag ctc agg agc gag ccc aaa tct tca gac aaa act 388Phe Cys Glu Asn Lys Leu Arg Ser Glu Pro Lys Ser Ser Asp Lys Thr 110 115 120cac aca tgc cca ccg tgc cca gca cct gaa gcc gag ggg gca ccg tca 436His Thr Cys Pro Pro Cys Pro Ala Pro Glu Ala Glu Gly Ala Pro Ser125 130 135 140gtc ttc ctc ttc ccc cca aaa ccc aag gac acc ctc atg atc tcc cgg 484Val Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met Ile Ser Arg 145 150 155acc cct gag gtc aca tgc gtg gtg gtg gac gtg agc cac gaa gac cct 532Thr Pro Glu Val Thr Cys Val Val Val Asp Val Ser His Glu Asp Pro 160 165 170gag gtc aag ttc aac tgg tac gtg gac ggc gtg gag gtg cat aat gcc 580Glu Val Lys Phe Asn Trp Tyr Val Asp Gly Val Glu Val His Asn Ala 175 180 185aag aca aag ccg cgg gag gag cag tac aac agc acg tac cgt gtg gtc 628Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val 190 195 200agc gtc ctc acc gtc ctg cac cag gac tgg ctg aat ggc aag gag tac 676Ser Val Leu Thr Val Leu His Gln Asp Trp Leu Asn Gly Lys Glu Tyr205 210 215 220aag tgc aag gtc tcc aac aaa gcc ctc cca tcc tcc atc gag aaa acc 724Lys Cys Lys Val Ser Asn Lys Ala Leu Pro Ser Ser Ile Glu Lys Thr 225 230 235atc tcc aaa gcc aaa ggg cag ccc cga gaa cca cag gtg tac acc ctg 772Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu 240 245 250ccc cca tcc cgg gat gag ctg acc aag aac cag gtc agc ctg acc tgc 820Pro Pro Ser Arg Asp Glu Leu Thr Lys Asn Gln Val Ser Leu Thr Cys 255 260 265ctg gtc aaa ggc ttc tat ccc agc gac atc gcc gtg gag tgg gag agc 868Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser 270 275 280aat ggg cag ccg gag aac aac tac aag acc acg cct ccc gtg ctg gac 916Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp285 290 295 300tcc gac ggc tcc ttc ttc ctc tac agc aag ctc acc gtg gac aag agc 964Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser 305 310 315agg tgg cag cag ggg aac gtc ttc tca tgc tcc gtg atg cat gag gct 1012Arg Trp Gln Gln Gly Asn Val Phe Ser Cys Ser Val Met His Glu Ala 320 325 330ctg cac aac cac tac acg cag aag agc ctc tcc ctg tct ccg ggt aaa 1060Leu His Asn His Tyr Thr Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 335 340 345taatctagag gcgcgccaat ta 1082 21348PRTArtificial SequenceTACI-Fc fusion protein 21Met Asp Ala Met Lys Arg Gly Leu Cys Cys Val Leu Leu Leu Cys Gly1 5 10 15Ala Val Phe Val Ser Leu Ser Gln Glu Ile His Ala Glu Leu Arg Arg 20 25 30Phe Arg Arg Ala Met Arg Ser Cys Pro Glu Glu Gln Tyr Trp Asp Pro 35 40 45Leu Leu Gly Thr Cys Met Ser Cys Lys Thr Ile Cys Asn His Gln Ser 50 55 60Gln Arg Thr Cys Ala Ala Phe Cys Arg Ser Leu Ser Cys Arg Lys Glu65 70 75 80Gln Gly Lys Phe Tyr Asp His Leu Leu Arg Asp Cys Ile Ser Cys Ala 85 90 95Ser Ile Cys Gly Gln His Pro Lys Gln Cys Ala Tyr Phe Cys Glu Asn 100 105 110Lys Leu Arg Ser Glu Pro Lys Ser Ser Asp Lys Thr His Thr Cys Pro 115 120 125Pro Cys Pro Ala Pro Glu Ala Glu Gly Ala Pro Ser Val Phe Leu Phe 130 135 140Pro Pro Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val145 150 155 160Thr Cys Val Val Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe 165 170 175Asn Trp Tyr Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro 180 185 190Arg Glu Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr 195 200 205Val Leu His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val 210 215 220Ser Asn Lys Ala Leu Pro Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala225 230 235 240Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg 245 250 255Asp Glu Leu Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly 260 265 270Phe Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro 275 280 285Glu Asn Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser 290 295 300Phe Phe Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln305 310 315 320Gly Asn Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His 325 330 335Tyr Thr Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 340 345221109DNAArtificial SequenceTACI-Fc fusion protein 22tattaggccg gccacc atg gat gca atg aag aga ggg ctc tgc tgt gtg ctg 52Met Asp Ala Met Lys Arg Gly Leu Cys Cys Val Leu1 5 10ctg ctg tgt ggc gcc gtc ttc gtt tcg ctc agc cag gaa atc cat gcc 100Leu Leu Cys Gly Ala Val Phe Val Ser Leu Ser Gln Glu Ile His Ala 15 20 25gag ttg aga cgc ttc cgt aga gct atg aga tcc tgc ccc gaa gag cag 148Glu Leu Arg Arg Phe Arg Arg Ala Met Arg Ser Cys Pro Glu Glu Gln 30 35 40tac tgg gat cct ctg ctg ggt acc tgc atg tcc tgc aaa acc att tgc 196Tyr Trp Asp Pro Leu Leu Gly Thr Cys Met Ser Cys Lys Thr Ile Cys45 50 55 60aac cat cag agc cag cgc acc tgt gca gcc ttc tgc agg tca ctc agc 244Asn His Gln Ser Gln Arg Thr Cys Ala Ala Phe Cys Arg Ser Leu Ser 65 70 75tgc cgc aag gag caa ggc aag ttc tat gac cat ctc ctg agg gac tgc 292Cys Arg Lys Glu Gln Gly Lys Phe Tyr Asp His Leu Leu Arg Asp Cys 80 85 90atc agc tgt gcc tcc atc tgt gga cag cac cct aag caa tgt gca tac 340Ile Ser Cys Ala Ser Ile Cys Gly Gln His Pro Lys Gln Cys Ala Tyr 95 100 105ttc tgt gag aac aag ctc agg agc cca gtg aac ctt cca cca gag ctc 388Phe Cys Glu Asn Lys Leu Arg Ser Pro Val Asn Leu Pro Pro Glu Leu 110 115 120agg gag ccc aaa tct tca gac aaa act cac aca tgc cca ccg tgc cca 436Arg Glu Pro Lys Ser Ser Asp Lys Thr His Thr Cys Pro Pro Cys Pro125 130 135 140gca cct gaa gcc gag ggg gca ccg tca gtc ttc ctc ttc ccc cca aaa 484Ala Pro Glu Ala Glu Gly Ala Pro Ser Val Phe Leu Phe Pro Pro Lys 145 150 155ccc aag gac acc ctc atg atc tcc cgg acc cct gag gtc aca tgc gtg 532Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val 160 165 170gtg gtg gac gtg agc cac gaa gac cct gag gtc aag ttc aac tgg tac 580Val Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr 175 180 185gtg gac ggc gtg gag gtg cat aat gcc aag aca aag ccg cgg gag gag 628Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu 190 195 200cag tac aac agc acg tac cgt gtg gtc agc gtc ctc acc gtc ctg cac 676Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His205 210 215 220cag gac tgg ctg aat ggc aag gag tac aag tgc aag gtc tcc aac aaa 724Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys 225 230 235gcc ctc cca tcc tcc atc gag aaa acc atc tcc aaa gcc aaa ggg cag 772Ala Leu Pro Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln 240 245 250ccc cga gaa cca cag gtg tac acc ctg ccc cca tcc cgg gat gag ctg 820Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Asp Glu Leu 255 260 265acc aag aac cag gtc agc ctg acc tgc ctg gtc aaa ggc ttc tat ccc 868Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro 270 275 280agc gac atc gcc gtg gag tgg gag agc aat ggg cag ccg gag aac aac 916Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn285 290 295 300tac aag acc acg cct ccc gtg ctg gac tcc gac ggc tcc ttc ttc ctc 964Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu 305 310 315tac agc aag ctc acc gtg gac aag agc agg tgg cag cag ggg aac gtc 1012Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val 320 325 330ttc tca tgc tcc gtg atg cat gag gct ctg cac aac cac tac acg cag 1060Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln 335 340 345aag agc ctc tcc ctg tct ccg ggt aaa taa tctagaggcg cgccaatta 1109Lys Ser Leu Ser Leu Ser Pro Gly Lys * 350 35523357PRTArtificial SequenceTACI-Fc fusion protein 23Met Asp Ala Met Lys Arg Gly Leu Cys Cys Val Leu Leu Leu Cys Gly1 5 10 15Ala Val Phe Val Ser Leu Ser Gln Glu Ile His Ala Glu Leu Arg Arg 20 25 30Phe Arg Arg Ala Met Arg Ser Cys Pro Glu Glu Gln Tyr Trp Asp Pro 35 40 45Leu Leu Gly Thr Cys Met Ser Cys Lys Thr Ile Cys Asn His Gln Ser 50 55 60Gln Arg Thr Cys Ala Ala Phe Cys Arg Ser Leu Ser Cys Arg Lys Glu65 70 75 80Gln Gly Lys Phe Tyr Asp His Leu Leu Arg Asp Cys Ile Ser Cys Ala 85 90 95Ser Ile Cys Gly Gln His Pro Lys Gln Cys Ala Tyr Phe Cys Glu Asn 100 105 110Lys Leu Arg Ser Pro Val Asn Leu Pro Pro Glu Leu Arg Glu Pro Lys 115 120 125Ser Ser Asp Lys Thr His Thr Cys Pro Pro Cys Pro Ala Pro Glu Ala 130 135 140Glu Gly Ala Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr145 150 155 160Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp Val 165 170 175Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly Val 180 185 190Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn Ser 195 200 205Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp Leu 210 215 220Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro Ser225 230 235 240Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu Pro 245 250 255Gln Val Tyr Thr Leu Pro Pro Ser Arg Asp Glu Leu Thr Lys Asn Gln 260 265 270Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile Ala 275 280 285Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr Thr 290 295 300Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys Leu305 310 315 320Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys Ser 325 330 335Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu Ser 340 345 350Leu Ser Pro Gly Lys 35524311PRTArtificial SequenceBAFF-R-Fc fusion protein 24Met Ser Ala Leu Leu Ile Leu Ala Leu Val Gly Ala Ala Val Ala Ser1 5 10 15Thr Arg Arg Gly Pro Arg Ser Leu Arg Gly Arg Asp Ala Pro Ala Pro 20 25 30Thr Pro Cys Val Pro Ala Glu Cys Phe Asp Leu Leu Val Arg His Cys 35 40 45Val Ala Cys Gly Leu Leu Arg Thr Pro Arg Pro Lys Pro Ala Gly Ala 50 55 60Ser Ser Pro Ala Pro Arg Thr Ala Leu Gln Pro Gln Glu Ser Gln Val65 70 75 80Thr Asp Lys Ala Ala His Tyr Thr Leu Cys Pro Pro Cys Pro Ala Pro 85 90 95Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys 100 105 110Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val 115 120 125Ala Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp 130 135 140Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr145 150 155 160Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp 165 170 175Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu 180 185 190Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg 195 200 205Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys 210 215 220Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp225 230 235 240Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 245 250 255Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 260 265 270Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 275 280 285Cys Ser Val Met His Glu Ala Leu His Asn His Tyr

Thr Gln Lys Ser 290 295 300Leu Ser Leu Ser Pro Gly Lys305 310251348DNAhomo sapiensCDS(282)...(1034) 25ggtacgaggc ttcctagagg gactggaacc taattctcct gaggctgagg gagggtggag 60ggtctcaagg caacgctggc cccacgacgg agtgccagga gcactaacag tacccttagc 120ttgctttcct cctccctcct ttttattttc aagttccttt ttatttctcc ttgcgtaaca 180accttcttcc cttctgcacc actgcccgta cccttacccg ccccgccacc tccttgctac 240cccactcttg aaaccacagc tgttggcagg gtccccagct c atg cca gcc tca tct 296Met Pro Ala Ser Ser1 5cct ttc ttg cta gcc ccc aaa ggg cct cca ggc aac atg ggg ggc cca 344Pro Phe Leu Leu Ala Pro Lys Gly Pro Pro Gly Asn Met Gly Gly Pro 10 15 20gtc aga gag ccg gca ctc tca gtt gcc ctc tgg ttg agt tgg ggg gca 392Val Arg Glu Pro Ala Leu Ser Val Ala Leu Trp Leu Ser Trp Gly Ala 25 30 35gct ctg ggg gcc gtg gct tgt gcc atg gct ctg ctg acc caa caa aca 440Ala Leu Gly Ala Val Ala Cys Ala Met Ala Leu Leu Thr Gln Gln Thr 40 45 50gag ctg cag agc ctc agg aga gag gtg agc cgg ctg cag ggg aca gga 488Glu Leu Gln Ser Leu Arg Arg Glu Val Ser Arg Leu Gln Gly Thr Gly 55 60 65ggc ccc tcc cag aat ggg gaa ggg tat ccc tgg cag agt ctc ccg gag 536Gly Pro Ser Gln Asn Gly Glu Gly Tyr Pro Trp Gln Ser Leu Pro Glu70 75 80 85cag agt tcc gat gcc ctg gaa gcc tgg gag aat ggg gag aga tcc cgg 584Gln Ser Ser Asp Ala Leu Glu Ala Trp Glu Asn Gly Glu Arg Ser Arg 90 95 100aaa agg aga gca gtg ctc acc caa aaa cag aag aag cag cac tct gtc 632Lys Arg Arg Ala Val Leu Thr Gln Lys Gln Lys Lys Gln His Ser Val 105 110 115ctg cac ctg gtt ccc att aac gcc acc tcc aag gat gac tcc gat gtg 680Leu His Leu Val Pro Ile Asn Ala Thr Ser Lys Asp Asp Ser Asp Val 120 125 130aca gag gtg atg tgg caa cca gct ctt agg cgt ggg aga ggc cta cag 728Thr Glu Val Met Trp Gln Pro Ala Leu Arg Arg Gly Arg Gly Leu Gln 135 140 145gcc caa gga tat ggt gtc cga atc cag gat gct gga gtt tat ctg ctg 776Ala Gln Gly Tyr Gly Val Arg Ile Gln Asp Ala Gly Val Tyr Leu Leu150 155 160 165tat agc cag gtc ctg ttt caa gac gtg act ttc acc atg ggt cag gtg 824Tyr Ser Gln Val Leu Phe Gln Asp Val Thr Phe Thr Met Gly Gln Val 170 175 180gtg tct cga gaa ggc caa gga agg cag gag act cta ttc cga tgt ata 872Val Ser Arg Glu Gly Gln Gly Arg Gln Glu Thr Leu Phe Arg Cys Ile 185 190 195aga agt atg ccc tcc cac ccg gac cgg gcc tac aac agc tgc tat agc 920Arg Ser Met Pro Ser His Pro Asp Arg Ala Tyr Asn Ser Cys Tyr Ser 200 205 210 gca ggt gtc ttc cat tta cac caa ggg gat att ctg agt gtc ata att 968Ala Gly Val Phe His Leu His Gln Gly Asp Ile Leu Ser Val Ile Ile 215 220 225ccc cgg gca agg gcg aaa ctt aac ctc tct cca cat gga acc ttc ctg 1016Pro Arg Ala Arg Ala Lys Leu Asn Leu Ser Pro His Gly Thr Phe Leu230 235 240 245ggg ttt gtg aaa ctg tga ttgtgttata aaaagtggct cccagcttgg 1064Gly Phe Val Lys Leu * 250aagaccaggg tgggtacata ctggagacag ccaagagctg agtatataaa ggagagggaa 1124tgtgcaggaa cagaggcatc ttcctgggtt tggctccccg ttcctcactt ttcccttttc 1184attcccaccc cctagacttt gattttacgg atatcttgct tctgttcccc atggagctcc 1244gaattcttgc gtgtgtgtag atgaggggcg ggggacgggc gccaggcatt gttcagacct 1304ggtcggggcc cactggaagc atccagaaca gcaccaccat ctta 134826250PRThomo sapiens 26Met Pro Ala Ser Ser Pro Phe Leu Leu Ala Pro Lys Gly Pro Pro Gly1 5 10 15Asn Met Gly Gly Pro Val Arg Glu Pro Ala Leu Ser Val Ala Leu Trp 20 25 30Leu Ser Trp Gly Ala Ala Leu Gly Ala Val Ala Cys Ala Met Ala Leu 35 40 45Leu Thr Gln Gln Thr Glu Leu Gln Ser Leu Arg Arg Glu Val Ser Arg 50 55 60Leu Gln Gly Thr Gly Gly Pro Ser Gln Asn Gly Glu Gly Tyr Pro Trp65 70 75 80Gln Ser Leu Pro Glu Gln Ser Ser Asp Ala Leu Glu Ala Trp Glu Asn 85 90 95Gly Glu Arg Ser Arg Lys Arg Arg Ala Val Leu Thr Gln Lys Gln Lys 100 105 110Lys Gln His Ser Val Leu His Leu Val Pro Ile Asn Ala Thr Ser Lys 115 120 125Asp Asp Ser Asp Val Thr Glu Val Met Trp Gln Pro Ala Leu Arg Arg 130 135 140Gly Arg Gly Leu Gln Ala Gln Gly Tyr Gly Val Arg Ile Gln Asp Ala145 150 155 160Gly Val Tyr Leu Leu Tyr Ser Gln Val Leu Phe Gln Asp Val Thr Phe 165 170 175Thr Met Gly Gln Val Val Ser Arg Glu Gly Gln Gly Arg Gln Glu Thr 180 185 190Leu Phe Arg Cys Ile Arg Ser Met Pro Ser His Pro Asp Arg Ala Tyr 195 200 205Asn Ser Cys Tyr Ser Ala Gly Val Phe His Leu His Gln Gly Asp Ile 210 215 220Leu Ser Val Ile Ile Pro Arg Ala Arg Ala Lys Leu Asn Leu Ser Pro225 230 235 240His Gly Thr Phe Leu Gly Phe Val Lys Leu 245 250

Claims

1. A method of detecting increased BLyS/APRIL heterotrimer (HT) levels of an individual comprising:(a) measuring a first level of HT in a biological sample and(b) comparing that level to a second level of HT in a biological sample of a healthy individual and(c) determining the first level is increased as compared to the second level, wherein said increased HT levels is associated with an autoimmune disease.

2. The method of claim 1, wherein the autoimmune disease is selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis.

3. The method of claim 1 wherein said autoimmune disease is SLE.

4. The method of claim 3 wherein measuring utilizes a luminex immunoassay.

5. A method of treating an individual clinically diagnosed with an autoimmune disease, comprising:analyzing a biological sample from an individual clinically diagnosed with autoimmune disease for the presence or absence of elevated BLyS/APRIL heterotrimer (HT) levels, wherein the presence of elevated APRIL protein levels is associated with the clinical diagnosis of autoimmune disease; andselecting a treatment plan that is most effective for individuals clinically diagnosed as having a condition associated with increased HT levels.

6. The method of claim 5 wherein said treatment plan involves administration of an HT antagonist.

7. The method of claim 5 wherein said HT antagonist is also a BLyS antagonist.

8. The method of claim 5 wherein said HT antagonist is also an APRIL antagonist.

9. The method of claim 5, wherein the autoimmune disease is selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis.

10. The method of claim 5 wherein said autoimmune disease is SLE.

11. The method of claim 5 wherein said analysis is with a luminex immunoassay.

12. A method for predicting a patient's likelihood to respond to a drug treatment for an autoimmune disease, comprising determining the BLyS/APRIL heterotrimer (HT) levels in a biological sample, wherein the presence of elevated HT levels is predictive of the patient's likelihood to respond to a drug treatment for the condition.

13. The method of claim 12 wherein the autoimmune disease is selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis.

14. The method of claim 12 wherein said autoimmune disease is RA.

15. The method of claim 12 wherein said determination is done using a luminex immunoassay.

16. The method of claim 12 wherein said drug treatment involves administration of an HT antagonist.

17. The method of claim 16 wherein said HT antagonist is also a BLyS antagonist.

18. The method of claim 16 wherein said HT antagonist is also an APRIL antagonist.

19. An in vitro method of detecting increased BLyS/APRIL heterotrimer (HT) levels in the serum of an individual, comprising:(a) measuring the level of HT in a test biological sample from the individual;(b) comparing that level to the level of HT in a sample from a healthy control; and(c) determining whether the level of HT in the test biological sample is increased as compared to the level in the control sample;wherein said increased HT levels is associated with an autoimmune disease.

20. The method of claim 19, wherein the autoimmune disease is selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis.

21. The method of claim 19 wherein said autoimmune disease is SLE.

22. An in vitro method of selecting a treatment plan that is most effective for treating an individual clinically diagnosed with an autoimmune disease, comprising:analyzing in vitro a biological sample from an individual clinically diagnosed with autoimmune disease for the presence or absence of elevated BLyS/APRIL heterotrimer (HT) levels in serum, wherein the presence of elevated HT levels is associated with the clinical diagnosis of autoimmune disease.

23. The method of claim 22 wherein said treatment plan involves the use of a HT antagonist.

24. The method of claim 23 wherein said HT antagonist is also a BLyS antagonist.

25. The method of claim 25 wherein said HT antagonist is also an APRIL antagonist.

26. The method of claim 22, wherein the autoimmune disease is selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis.

27. The method of claim 23 wherein said autoimmune disease is RA.

28. The method of claim 20 wherein said individual is newly diagnosed with RA.

29. An in vitro method for predicting a patient's likelihood to respond to a drug treatment for an autoimmune disease, comprising determining the level of BLyS/APRIL heterotrimer (HT) levels in a sample from the patient; wherein the presence of elevated HT levels is predictive of the patient's likelihood to respond to a drug treatment for the condition.

30. The method of claim 29 wherein the autoimmune disease is selected from the group consisting of rheumatoid arthritis, juvenile rheumatoid arthritis, systemic lupus erythematosus (SLE), lupus nephritis (LN), Wegener's disease, inflammatory bowel disease, idiopathic thrombocytopenic purpura (ITP), thrombotic throbocytopenic purpura (TTP), autoimmune thrombocytopenia, multiple sclerosis, psoriasis, IgA nephropathy, IgM polyneuropathies, myasthenia gravis, vasculitis, diabetes mellitus, Reynaud's syndrome, Sjorgen's syndrome and glomerulonephritis.

31. The method of claim 29 wherein said autoimmune disease is SLE.

32. The method of claim 29 wherein said determination is done utilizing a luminex immunoassay.

33. The method of claim 29 wherein said drug treatment comprises a HT antagonist.

34. The method of claim 30 wherein said HT antagonist is also a BLyS antagonist.

35. The method of claim 30 wherein said HT antagonist is also an APRIL antagonist.

36. A HT antagonist for use in the treatment of an autoimmune disease in a patient, wherein said patient has elevated levels of BLyS/APRIL heterotrimer (HT) levels in serum.

37. The antagonist of claim 36 wherein the autoimmune disease is SLE.

38. The antagonist of claim 36 wherein said HT antagonist is also a BLyS antagonist.

39. The antagonist of claim 36 wherein said HT antagonist is also an APRIL antagonist.

40. The antagonist of claim 36 wherein said antagonist is a receptor-extracellular domain/Fc domain fusion protein selected from the group consisting of TACI-Ig and BCMA-Ig.

41. The antagonist of claim 40 wherein said receptor-extracellular domain/Fc domain fusion protein is TACI-Ig.

42. The antagonist of claim 41 wherein said TACI-Ig is atacicept.

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