Integrative epigenome-wide analysis demonstrates that DNA methylation may mediate genetic risk in inflammatory bowel disease

N. T. Ventham, Nicholas A. Kennedy, A. T. Adams, R. Kalla, Simon Heath, K. R. O'Leary, H. Drummond, David C. Wilson, I. G. Gut, E. R. Nimmo, Jack Satsangi, Gordan Lauc, Harry Campbell, Dermot P B McGovern, Vito Annese, Vlatka Zoldoš, Iain K. Permberton, Manfred Wuhrer, Daniel Kolarich, Daryl L. FernandesEvropi Theorodorou, Victoria Merrick, Daniel I. Spencer, Richard A. Gardner, Ray Doran, Archana Shubhakar, Ray Boyapati, Igor Rudan, Paolo Lionetti, Irena Trbojević Akmačić, Jasminka Krištić, Frano Vučković, Jerko Štambuk, Mislav Novokmet, Maja Pučić-Baković, Olga Gornik, Angelo Andriulli, Laura Cantoro, Giancarlo Sturniolo, Gionata Fiorino, Natalia Manetti, Anna Latiano, Anna Kohn, Renata D'Incà, Silvio Danese, Ian D. Arnott, Colin L. Noble, Charlie W. Lees, Alan G. Shand, Gwo Tzer Ho, IBD BIOM consortium, IBD CHARACTER consortium

Research output: Contribution to journalArticlepeer-review

Abstract

Epigenetic alterations may provide important insights into gene-environment interaction in inflammatory bowel disease (IBD). Here we observe epigenome-wide DNA methylation differences in 240 newly-diagnosed IBD cases and 190 controls. These include 439 differentially methylated positions (DMPs) and 5 differentially methylated regions (DMRs), which we study in detail using whole genome bisulphite sequencing. We replicate the top DMP (RPS6KA2) and DMRs (VMP1, ITGB2 and TXK) in an independent cohort. Using paired genetic and epigenetic data, we delineate methylation quantitative trait loci; VMP1/microRNA-21 methylation associates with two polymorphisms in linkage disequilibrium with a known IBD susceptibility variant. Separated cell data shows that IBD-associated hypermethylation within the TXK promoter region negatively correlates with gene expression in whole-blood and CD8+ T cells, but not other cell types. Thus, site-specific DNA methylation changes in IBD relate to underlying genotype and associate with cell-specific alteration in gene expression.

Original languageEnglish
Article number13507
JournalNature Communications
Volume7
DOIs
Publication statusPublished - Nov 25 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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