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pubmed-article:19602000pubmed:abstractTextCytotoxic T lymphocyte-associated antigen-4 is a cell-surface molecule providing a negative signal for T cell activation. CTLA-4 gene polymorphisms are known to be related with genetic susceptibility to various autoimmune diseases, including systemic lupus erythematosus (SLE). However, the effects of this polymorphism on clinical features of SLE have not been defined. We analysed the CTLA-4 gene +49 A/G polymorphisms in patients with SLE by using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and investigated the effect of polymorphisms on clinical outcomes. Blood was collected from 47 unrelated Turkish SLE patients, all fulfilling the American College of Rheumatology criteria for SLE, and 100 ethnically matched healthy volunteers. The AA genotype was a predominant genotype in the Turkish population and genotype frequencies of CTLA-4 AA were significantly higher in SLE patients (70%) than healthy controls (47%) (P = 0.015). There was a statistically significant difference in the AA genotype [odds ratio (OR): 2.66, confidence interval (CI) 95%: 1.27-5.56, P = 0.014] distribution among patients and controls. There was also an increase in A allele frequency in SLE and controls, but the difference was not statistically significant (81% vs. 70%, P = 0.068, OR = 1.8, CI 95%: 0.99-3.28). Interestingly, mean age and mean age of onset disease was higher in AA homozygote SLE patients compared to non-AA (39.2 +/- 11.5 vs. 31.6 +/- 10.6, P = 0.044; 32.38 vs. 24.31, P = 0.046, respectively). There was no association between genotype and the other clinical features of SLE. Our results suggested that CTLA-4 +49 AA genotype might be a risk factor for the development of SLE in Turkish population and G allele might be involved in early development of SLE. No association with clinical features was found for polymorphism of the promoter region in CTLA-4 +49.lld:pubmed
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pubmed-article:19602000pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:19602000pubmed:articleTitleCTLA-4 gene polymorphism of exon 1(+49 A/G) in Turkish systemic lupus erythematosus patients.lld:pubmed
pubmed-article:19602000pubmed:affiliationAkdeniz University Teknocity, Kampus Antalya, Turkey.lld:pubmed
pubmed-article:19602000pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19602000pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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