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Impact of Genes and the Environment on the Pathogenesis and Disease Course of Inflammatory Bowel Disease

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Abstract

Crohn’s disease and ulcerative colitis constitute two major subgroups of inflammatory bowel diseases (IBD), a group of complex polygenic diseases characterized by chronic and progressive inflammation in the gastrointestinal tract. In recent years, methodological advances in genetic analysis have greatly expanded our understanding of the genetic background of IBD. So far, more than 240 genetic risk loci have been identified for IBD. However, these risk alleles explain less than 30% of the susceptibility to disease development, suggesting that environmental factors contribute considerably. The increasing occurrence of IBD in Eastern countries following their ‘westernization’, as well as the increased risk of disease among those who migrate to high-incidence regions, also suggest that the environment is key in the pathogenesis of IBD. In this review, we summarize the current evidence on the role of genetic and environmental factors in the susceptibility to, and disease course of, IBD, and we suggest how these findings might be applied to clinical practice.

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  1. Gastro Unit, Hvidovre University Hospital, Kettegaard Alle 30, 2650, Hvidovre, Denmark

    Mirabella Zhao & Johan Burisch

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Zhao, M., Burisch, J. Impact of Genes and the Environment on the Pathogenesis and Disease Course of Inflammatory Bowel Disease. Dig Dis Sci 64, 1759–1769 (2019). https://doi.org/10.1007/s10620-019-05648-w

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