• Amit K Maiti, Xana Kim-Howard, Parvathi Viswanathan, Laura Guillén, Xiaoxia Qian, Adriana Rojas-Villarraga, Celi Sun, Carlos Cañas, Gabriel J Tobón, Koichi Matsuda, Nan Shen, Alejandra C Cherñavsky, Juan-Manuel Anaya, and Swapan K Nath.
• Genetic Epidemiology Unit, Arthritis and Immunology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA.
• Rheumatology (Oxford). 2010 Jul 1; 49 (7): 1239-44.

ObjectivesRecently, a non-synonymous (Gly307Ser) variant, rs763361, in the CD226 gene was shown to be associated with multiple autoimmune diseases (ADs) in European Caucasian populations. However, shared autoimmunity with CD226 has not been evaluated in non-European populations. The aim of the present study is to assess the association of this single nucleotide polymorphism (SNP) with ADs in non-European populations.MethodsTo replicate this association in non-European populations, we evaluated case-control association between rs763361 and coeliac disease (CED) samples from Argentina; SLE, RA, type-1 diabetes (T1D) and primary SS (pSS) from Colombia; and SLE samples from China and Japan. We genotyped rs763361 and evaluated its genetic association with multiple ADs, using chi(2)-test. For each association, odds ratio (OR) and 95% CI were calculated.ResultsWe show that rs763361 is significantly associated with Argentinean CED (P = 0.0009, OR = 1.60). We also observed a trend of possible association with Chinese SLE (P = 0.01, OR = 1.19), RA (P = 0.047, OR = 1.25), SLE (P = 0.0899, OR = 1.24) and pSS (P = 0.09, OR = 1.33) in Colombians. Meta-analyses for SLE (using our three populations) and T1D (our population and three published populations) yielded significant association with rs763361, P = 0.009 (OR = 1.16) and P = 1.1.46 x 10(-9) (OR = 1.14), respectively.ConclusionsOur results demonstrate that the coding variant rs763361 in CD226 gene is associated with multiple ADs in non-European populations.

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