TRAF1 and rheumatoid arthritis: Interestingly, Potter and colleagues [48], who studied 23 haplotype-tagging SNPs from the 6 TRAF genes, including three from TRAF1, in a UK case-control study (351 RA cases / 368 controls) failed to see association with both a Group1 (rs1468671) and a Group2 (rs4836834) SNP.