Integration of human pancreatic islet genomic data refines regulatory mechanisms at type 2 diabetes susceptibility loci

Matthias Thurner, Martijn van de Bunt, Jason M. Torres, Anubha Mahajan, Vibe Nylander, Amanda J. Bennett, Kyle J. Gaulton, Amy Barrett, Carla Burrows, Christopher G. Bell, Robert Lowe, Stephan Beck, Vardhman K. Rakyan, Anna L. Gloyn, Mark I. McCarthy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

Human genetic studies have emphasised the dominant contribution of pancreatic islet dysfunction to development of Type 2 Diabetes (T2D). However, limited annotation of the islet epigenome has constrained efforts to define the molecular mechanisms mediating the, largely regulatory, signals revealed by Genome-Wide Association Studies (GWAS). We characterised patterns of chromatin accessibility (ATAC-seq, n = 17) and DNA methylation (whole-genome bisulphite sequencing, n = 10) in human islets, generating high-resolution chromatin state maps through integration with established ChIP-seq marks. We found enrichment of GWAS signals for T2D and fasting glucose was concentrated in subsets of islet enhancers characterised by open chromatin and hypomethylation, with the former annotation predominant. At several loci (including CDC123, ADCY5, KLHDC5) the combination of fine-mapping genetic data and chromatin state enrichment maps, supplemented by allelic imbalance in chromatin accessibility pinpointed likely causal variants. The combination of increasingly-precise genetic and islet epigenomic information accelerates definition of causal mechanisms implicated in T2D pathogenesis.

Original languageEnglish
Article numbere31977
JournaleLife
Volume7
DOIs
Publication statusPublished - 7 Feb 2018

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