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

Research output: Contribution to journalArticlepeer-review

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

Original languageEnglish
Article numbere31977
JournaleLife
Volume7
DOIs
Accepted/In press6 Feb 2018
Published7 Feb 2018

King's Authors

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.

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