Association of Gene Polymorphisms in CXC Chemokine Receptor 5 with Rheumatoid Arthritis Susceptibility.

Rheumatoid arthritis (RA) is caused by complicated interactions between genes and the environment. CXC chemokine receptor 5 (CXCR5) is required for B and T follicular helper cell migration and humoral immunity generation. Therefore, this study aimed to assess whether polymorphisms of the CXCR5 gene are implicated in RA development and progression. This case-control study enrolled 285 RA patients and 291 healthy controls. The polymerase chain reaction-ligase detection reaction method was used to genotype rs630923, rs497916, rs3922, and rs676925 in the CXCR5 gene. Epidemiological, clinical, and laboratory data were collected retrospectively. The rs630923 A allele was associated with a higher risk of RA (AOR [adjusted odds ratio]=2.00, 95% confidence interval [CI] =1.14-3.53). However, in the RA group, the frequency of the rs497916 T allele was lower (AOR=0.69, 95% CI=0.51-0.93). Regarding rs3922, AG+GG genotype carriers were at a significantly lower risk for RA than AA genotype carriers (AOR=0.70, 95% CI=0.49-0.99). In the RA group, we found that the different genotypes were significantly associated with specific laboratory values, including rheumatoid factor, total bilirubin, total cholesterol, low-density lipoprotein cholesterol, and alkaline phosphatase. This is the first report indicating that CXCR5 polymorphisms were associated with RA susceptibility. These findings lead to a rising possibility of identifying RA-susceptible individuals based on genetic markers.