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Deletion polymorphism upstream of IRGM associated with altered IRGM expression and Crohn's disease
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2008 (English)In: Nature Genetics, ISSN 1061-4036, E-ISSN 1546-1718, Vol. 40, no 9, 1107-1112 p.Article in journal (Refereed) Published
Abstract [en]

Following recent success in genome-wide association studies, a critical focus of human genetics is to understand how genetic variation at implicated loci influences cellular and disease processes. Crohn's disease (CD) is associated with SNPs around IRGM, but coding-sequence variation has been excluded as a source of this association. We identified a common, 20-kb deletion polymorphism, immediately upstream of IRGM and in perfect linkage disequilibrium (r2 = 1.0) with the most strongly CD-associated SNP, that causes IRGM to segregate in the population with two distinct upstream sequences. The deletion (CD risk) and reference (CD protective) haplotypes of IRGM showed distinct expression patterns. Manipulation of IRGM expression levels modulated cellular autophagy of internalized bacteria, a process implicated in CD. These results suggest that the CD association at IRGM arises from an alteration in IRGM regulation that affects the efficacy of autophagy and identify a common deletion polymorphism as a likely causal variant.

Place, publisher, year, edition, pages
2008. Vol. 40, no 9, 1107-1112 p.
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Medical and Health Sciences
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URN: urn:nbn:se:uu:diva-100863DOI: 10.1038/ng.215ISI: 000258761200025PubMedID: 19165925OAI: oai:DiVA.org:uu-100863DiVA: diva2:211140
Available from: 2009-04-08 Created: 2009-04-08 Last updated: 2017-12-13Bibliographically approved

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