Genetic Studies of Ankylosing Spondylitis in Koreans Confirm Associations with ERAP1 and 2p15 Reported in White Patients

Objective. Investigators from the Australo-Anglo-American Spondyloarthritis Consortium have reported additional genes associated with ankylosing spondylitis (AS) susceptibility including IL1R2, ANTXR2, and gene deserts at 2p15 and 21q22. We evaluated these new candidate genes in a large cohort of Korean patients with AS. Methods. A group of 1164 patients with AS and 752 healthy controls were enrolled for our study. Eight single-nucleotide polymorphisms (SNP) were analyzed to define genetic association with AS by MassARRAY system. Results. Significant positive associations of AS with endoplasmic reticulum aminopeptidase 1 SNP, rs27037 (p = 1.31 x 10(-4)), and rs27434 (p = 4.59 x 10(-6)), were observed. The rs10865331 of gene desert at 2p15 also showed a significant association with AS (p = 4.63 x 10(-5)). Conclusion. This is the first confirmation in a nonwhite population that genetic polymorphisms of rs27037, rs27434, and rs10865331 are associated with AS, implicating common pathogenetic mechanisms in Korean and white patients with AS. (First Release Nov 1 2010; J Rheumatol 2011; 38:322-4; doi:10.3899/jrheum.100652)