Association of ultraviolet radiation resistance-associated gene polymorphisms with rheumatoid arthritis.

The ultraviolet radiation resistance-associated gene (UVRAG) protein binds to the Beclin 1/PI3-kinase III complex and promotes autophagy. Autophagy may be upregulated by endoplasmic reticulum (ER) stress. Persistent and excessive ER stress may alter synovial fibroblast apoptosis and this alteration may affect the pathogenesis of rheumatoid arthritis (RA). In this study, we investigated whether UVRAG genetic polymorphisms are associated with RA. To determine the association between UVRAG polymorphisms and RA, we genotyped five UVRAG single-nucleotide polymorphisms (SNPs; rs7111334, intron C/T; rs7933235, intron A/G; rs1380075, intron T/A; rs1458836, near the 5' gene terminal G/A; and rs636420, exon 15 C/T) using a direct sequencing method in 243 RA patients and 417 control subjects. Among these, one SNP (rs7111334) exhibited significant genotypic/allelic differences between RA patients and the control group. Therefore, this study suggested a possible association between UVRAG polymorphisms and RA susceptibility.