Background: A large-scale meta-analysis of a series of European genome-wide association studies revealed 71 susceptibility loci for Crohn's disease (CD). However, it is not clear whether these susceptibility loci are also shared with Japanese populations.
Methods: We genotyped 71 single-nucleotide polymorphisms (SNPs) comprising 1311 CD cases and 6585 controls of Japanese descent, and their associations with CD were evaluated using the Cochran–Armitage trend test. In addition, genotype–phenotype analyses were conducted on the SNPs showing associations with Japanese CD based on the Montreal classification.
Results: Twenty-seven SNPs showed at least nominal association (P < 0.05) and 11 of them remained significant even after Bonferroni correction (P < 0.0007). Despite high statistical power, we could not find any association in 17 loci. Moreover, SNPs in 9 loci were rare or absent in the Japanese population. Genetic variations involved in the innate immune system (NOD2, ATG16L1, and IRGM) showed no association with CD susceptibility in the Japanese population. Genotype–phenotype analyses showed that rs3810936, a marker of TNFSF15, correlated with severe CD phenotypes.
Conclusions: Our study suggests that there is a differential genetic background of CD susceptibility between Japanese and European populations.
Article first published online 6 February 2013
*Laboratory for Genotyping Development, Center for Genomic Medicine, RIKEN Yokohama Institute, Yokohama, Japan
†Department of Medicine and Department of Clinical Science,
‡Department of Environmental Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
§Department of Gastroenterology, Fukuoka University Chikushi Hospital, Fukuoka, Japan
‖Department of Medicine, Division of Gastroenterology, Social Insurance Chuo General Hospital, Tokyo, Japan
¶Department of Gastroenterology, Sapporo-Kosei General Hospital, Sapporo, Japan
**Human Genome Center, Institute of Medical Science, the University of Tokyo, Tokyo, Japan.
Reprints: Michiaki Kubo, MD, PhD, Laboratory for Genotyping Development, Center for Genomic Medicine, RIKEN Yokohama Institute, 1-7-22, Suehiro-cho, Tsurumi, Yokohama, Kanagawa 230-0045, Japan (e-mail: email@example.com).
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The authors have no conflicts of interest to disclose.
This work was conducted as a part of the BioBank Japan Project and supported by a Grant-in-Aid for Young Scientists (A) (22689025) from the Ministry of Education, Culture, Sports, Sciences and Technology of the Japanese government.
Received July 26, 2012
Accepted August 04, 2012