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To explore the potential genetic association of CTLA-4 Exon1 +49A/G and 3'UTR (AT)(n) to susceptibility to systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), and overlapping (OP) autoimmunity; affected with more than one autoimmune disease. Expression of two major CTLA-4 isoforms; full length (mCTLA-4) and soluble (sCTLA-4) were explored in all subjects. A total of 680-age/gender/ethnically matched Kuwaitis were recruited and polymerase chain reaction (PCR)-fragment analysis was employed for genotyping both markers. mCTLA-4 and sCTLA-4 mRNA expression were analyzed using quantitative real time-PCR. The enzyme-linked immunosorbent assay (ELISA) was used to screen sCTLA-4 in all subjects' sera.

Overexpression and Secretion of the Soluble CTLA-4 Splice Variant in Various Autoimmune Diseases and in Cases with Overlapping Autoimmunity