No Association of Eight TNFAIP3 Single Nucleotide Variants to Rheumatoid Arthritis in Native Mexicans

Rheumatoid arthritis (RA) is a chronic inflammatory disease of autoimmune origin associated with many genetic traits, including genes related to the control of inflammation. The A20 protein, encoded by the TNFAIP3 gene, is a negative regulator of NF-kB-mediated inflammation. Several single nucleotide variants (SNVs) of TNFAIP3 are associated with susceptibility to RA in different ethnic groups, but not in Chileans, the only Latin Americans studied thus far. Objective. To examine the association of eight TNFAIP3 SNVs, four of them not previously studied, with RA in Mexican patients. Materials . We studied 471 RA patients (ACR-EULAR 2010) and eight TNFAIP3 SNVs: including, rs10499194C/T, rs6920220G/A and rs2230926T/G, which are associated with RA in European and Asian patients, in addition to rs373421182G/C, rs139054966T/G, rs5029924C/T, rs59693083A/G and rs61593413T/A, not previously examined in RA. All SNVs were evaluated by means of an allelic discrimination assay and TaqMan probes. Results. The allelic and genotypic frequencies of all SNVs examined were similar between cases and controls, and none of them was associated with RA under the allelic, codominant, dominant, and recessive models was observed. Conclusion. Our data indicate that the TNFAIP3 SNVs evaluated herein are not risk factors for RA in Mexican subjects.