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Characteristics of Japanese inflammatory bowel disease susceptibility loci

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Abstract

Background

There are substantial differences in inflammatory bowel disease (IBD) genetics depending on the populations examined. We aimed to identify Japanese population-specific or true culprit susceptibility genes through a meta-analysis of past genetic studies of Japanese IBD.

Methods

For this study, we reviewed 2,703 articles. The review process consisted of three screening stages: we initially searched for relevant studies and then relevant single nucleotide polymorphisms (SNPs). Finally, we adjusted them for the meta-analysis. To maximize our chances of analysis, we introduced proxy SNPs during the first stage. To minimize publication bias, no significant SNPs and solitary SNPs without pairs were combined to be reconsidered during the third stage. Additionally, two SNPs were newly genotyped. Finally, we conducted a meta-analysis of 37 published studies in 50 SNPs located at 22 loci corresponding to the total number of 4,853 Crohn’s disease (CD), 5,612 ulcerative colitis (UC) patients, and 14,239 healthy controls.

Results

We confirmed that the NKX23 polymorphism is associated with common susceptibility to IBD and that HLA-DRB1*0450 alleles increase susceptibility to CD but reduce risk for UC while HLA-DRB1*1502 alleles increase susceptibility to UC but reduce CD risk. Moreover, we found individual disease risk loci: TNFSF15 and TNFα to CD and HLA-B*5201, and NFKBIL1 to UC. The genetic risk of HLA was substantially high (odds ratios ranged from 1.54 to 2.69) while that of common susceptibility loci to IBD was modest (odds ratio ranged from 1.13 to 1.24).

Conclusions

Results indicate that Japanese IBD susceptibility loci identified by the meta-analysis are closely associated with the HLA regions.

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Acknowledgments

This work was supported in part by Health and Labor Sciences Research Grants for Research on Intractable Diseases from the Ministry of Health, Labor and Welfare of Japan (Y.A.). We are very grateful to Dr. Y Numata, Dr. H Nasuno, and Dr. Y Ishimine, residents of the First Department of Internal Medicine, for their resource collection.

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The authors declare that they have no conflict of interest.

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Arimura, Y., Isshiki, H., Onodera, K. et al. Characteristics of Japanese inflammatory bowel disease susceptibility loci. J Gastroenterol 49, 1217–1230 (2014). https://doi.org/10.1007/s00535-013-0866-2

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