Association of IRF5 gene polymorphisms with rheumatoid arthritis in a Tunisian population
2008
Objective: A strong genetic association of rheumatoid arthritis (RA) with the interferon regulatory factor 5 (IRF5) gene has been described previously in a Swedish population, although this result was not confirmed in a French population. We undertook an association study between IRF5 and the RA phenotype, as well as a study with serological markers of RA, in a Tunisian population.Methods: A single‐nucleotide polymorphism (SNP; rs2004640) was genotyped using a Taqman 5′ allelic discrimination assay on an ABI 7500 real‐time polymerase chain reaction (PCR) instrument in 140 RA patients and 185 controls. Rheumatoid factor (RF) and anti‐citrullinated protein/peptide antibodies (ACPA) were determined by enzyme‐linked immunosorbent assay (ELISA). Association was assessed based on the χ2 test and odds ratios (ORs) with 95% confidence intervals (CIs).Results: The frequency of the TT genotype of the IRF5 SNP rs2004640 differed significantly between patients and controls (p = 0.01). This difference was greater when...
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