Integration of human pancreatic islet genomic data refines regulatory mechanisms at Type 2 Diabetes susceptibility loci

Study ID Alternative Stable ID Type
EGAS00001002592 Other

Study Description

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 ... (Show More)

Study Datasets 3 datasets.

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Dataset ID Description Technology Samples
DNA from 10 human pancreatic islet samples was processed for Whole-genome Bisulphite Sequencing. The resulting libraries were sequenced on an Illumina Hiseq 2000 to generate 100bp paired-end read data. The resulting fastq.gz and mapped bam files were deposited.
Illumina HiSeq 2000 10
18 human pancreatic islet preparations derived from 17 donors were processed for ATAC-seq. The data was generated on an Illumina Hiseq 2500 sequencing machine to generate 50bp paired end read data. The resulting fastq.gz and mapped bam files were deposited.
Illumina HiSeq 2500 18
HumanMethylation450K 41

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