Genetic Polymorphism (rs329498) in the Pellino-1 Gene as Possible Predisposal Factor for Systemic Lupus Erythematosus in a Chinese Population

OBJECTIVE: The purpose of this study was to analyze the association of two single nucleotide polymorphisms (SNPs) in Peli-1 gene with systemic lupus erythematosus (SLE) in a Chinese population. METHODS: We conducted a case-control study and a total of 738 SLE patients and 827 healthy controls were finally recruited. Peli-1 rs329498 and rs10496105 polymorphisms were specified from genomic DNA using TaqMan genotyping assay on Fluidigm 192.24 system. RESULTS: Allele contrast showed the minor allele C was associated with decreased risk for SLE when compared with the A allele (OR = 0.851, 95% CI = 0.737-0.983, p = 0.028). Significant difference was observed in genotype distribution of rs329498 polymorphism between lupus nephritis (LN) patients and non-LN patients (χ(2) = 8.18, p = 0.017). Furthermore, we also found a decreased frequency of the minor allele C in LN patients (29.2%) than in non-LN patients (37.7%) (χ(2) = 8.67, p = 0.003). Moreover, a significant difference was also detected under a dominant model with regard to the distribution of genotype frequencies between LN patients and non-LN patients (CC + AC vs. AA: OR = 0.632, 95% CI = 0.451-0.884, p = 0.007). Clinical features analysis showed a significant difference in the distribution of genotypic frequencies between patients with malar rash and patients without this feature (χ(2) = 6.63, p = 0.036). Unfortunately, we failed to find any significant results between Peli-1 gene rs10496105 and SLE susceptibility. CONCLUSIONS: Our observations suggested that Peli-1 gene polymorphism rs329498 might contribute to SLE susceptibility in Chinese Han Population. Likewise, the rs329498 SNP was also associated with the clinical features LN and malar rash in SLE patients.