The contribution of NOD2 gene mutations to the risk and site of disease in inflammatory bowel disease

Gastroenterology
Andrew P CuthbertChristopher G Mathew

Abstract

Mutations in the NOD2 gene are strongly associated with susceptibility to Crohn's disease (CD). We analyzed a large cohort of European patients with inflammatory bowel disease to determine which mutations confer susceptibility, the degree of risk conferred, their prevalence in familial and sporadic forms of the disease, and whether they are associated with site of disease. Individuals were genotyped for 4 NOD2 mutations: P268S, R702W, G908R, and 3020insC. Allelic transmission distortion to 531 CD- and 337 ulcerative colitis-affected offspring was assessed by the transmission disequilibrium test. Association was also tested in an independent cohort of 995 patients with inflammatory bowel disease and 290 controls. Cases were stratified by disease site and compared across NOD2 genotypes. R702W, G908R, and 3020insC were strongly associated with CD but not with ulcerative colitis. Linkage disequilibrium was observed between P268S and the other mutations, forming 3 independent disease haplotypes. Genotype relative risks were 3.0 for mutation heterozygotes and 23.4 for homozygotes or compound heterozygotes. The frequency of NOD2 mutations was higher in cases from families affected only with CD and was significantly increased in ileal-...Continue Reading

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