Independent and population-specific association of risk variants at the IRGM locus with Crohn's disease.

Human Molecular Genetics
Natalie J PrescottChristopher G Mathew

Abstract

DNA polymorphisms in a region on chromosome 5q33.1 which contains two genes, immunity related GTPase related family, M (IRGM) and zinc finger protein 300 (ZNF300), are associated with Crohn's disease (CD). The deleted allele of a 20 kb copy number variation (CNV) upstream of IRGM was recently shown to be in strong linkage disequilibrium (LD) with the CD-associated single nucleotide polymorphisms and is itself associated with CD (P < 0.01). The deletion was correlated with increased or reduced expression of IRGM in transformed cells in a cell line-dependent manner, and has been proposed as a likely causal variant. We report here that small insertion/deletion polymorphisms in the promoter and 5' untranslated region of IRGM are, together with the CNV, strongly associated with CD (P = 1.37 x 10(-5) to 1.40 x 10(-9)), and that the CNV and the 5'-untranslated region variant -308(GTTT)(5) contribute independently to CD susceptibility (P = 2.6 x 10(-7) and P = 2 x 10(-5), respectively). We also show that the CD risk haplotype is associated with a significant decrease in IRGM expression (P < 10(-12)) in untransformed lymphocytes from CD patients. Further analysis of these variants in a Japanese CD case-control sample and of IRGM express...Continue Reading

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Datasets Mentioned

BETA
NA18555

Methods Mentioned

BETA
GTPase
genotyping
PCR
electrophoresis
FCS
chip

Software Mentioned

GeneCodes
Haploview
Sequencher
Sequence Scanner
UNPHASED
R

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