You Y, Wang Z, Deng GH, Liu Y, Hao F. Detection and functional evaluation of -262A/T and -188A/G polymorphisms of SLAM gene in patients with systemic lupus erythematosus.
J Rheumatol 2010;
37:2268-72. [PMID:
20810499 DOI:
10.3899/jrheum.091390]
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Abstract
OBJECTIVE
Signaling lymphocytic activation molecule (SLAM) has been related to the pathology of systemic lupus erythematosus (SLE) through regulation of T cell-dependent humoral immune responses. We investigated the functional associations of the -262A/T and -188A/G polymorphisms of SLAM in Chinese patients with SLE.
METHODS
Genotyping of -262A/T (rs2295614) and -188A/G (rs2295613) in SLAM was carried out in 248 cases and 278 controls. Promoter activities of haplotypes on the SLAM gene were evaluated with the dual-luciferase reporter system. The mRNA expressions of SLAM on peripheral blood mononuclear cells (PBMC) of SLE patients with different genotypes were determined by real-time polymerase chain reaction.
RESULTS
Frequencies of -262A allele and -188G allele were significantly higher in SLE patients than in controls. Haplotype analysis and multifactorial logistic regression analysis showed that individuals with the AG/AG haplotype had increased susceptibility to SLE (p = 0.002, OR 1.478, 95% CI 1.152-1.897). In response to PHA stimulation, the SLAM mRNA expression on PBMC of SLE patients was significantly higher in -262A-188G haplotype homozygotes compared with -262A-188G heterozygotes and individuals with other genotypes.
CONCLUSION
Our findings suggest that -262A-188G haplotype in the SLAM gene promoter contributes to the risk of SLE by increasing the expression of SLAM.
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