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Diabetologia
Published in: Diabetologia 7/2018

Open Access 01-07-2018 | Article

Patterns of differential gene expression in a cellular model of human islet development, and relationship to type 2 diabetes predisposition

Authors: Marta Perez-Alcantara, Christian Honoré, Agata Wesolowska-Andersen, Anna L. Gloyn, Mark I. McCarthy, Mattias Hansson, Nicola L. Beer, Martijn van de Bunt

Published in: Diabetologia | Issue 7/2018

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Abstract

Aims/hypothesis

Most type 2 diabetes-associated genetic variants identified via genome-wide association studies (GWASs) appear to act via the pancreatic islet. Observed defects in insulin secretion could result from an impact of these variants on islet development and/or the function of mature islets. Most functional studies have focused on the latter, given limitations regarding access to human fetal islet tissue. Capitalising upon advances in in vitro differentiation, we characterised the transcriptomes of human induced pluripotent stem cell (iPSC) lines differentiated along the pancreatic endocrine lineage, and explored the contribution of altered islet development to the pathogenesis of type 2 diabetes.

Methods

We performed whole-transcriptome RNA sequencing of human iPSC lines from three independent donors, at baseline and at seven subsequent stages during in vitro islet differentiation. Differentially expressed genes (q < 0.01, log2 fold change [FC] > 1) were assigned to the stages at which they were most markedly upregulated. We used these data to characterise upstream transcription factors directing different stages of development, and to explore the relationship between RNA expression profiles and genes mapping to type 2 diabetes GWAS signals.

Results

We identified 9409 differentially expressed genes across all stages, including many known markers of islet development. Integration of differential expression data with information on transcription factor motifs highlighted the potential contribution of REST to islet development. Over 70% of genes mapping within type 2 diabetes-associated credible intervals showed peak differential expression during islet development, and type 2 diabetes GWAS loci of largest effect (including TCF7L2; log2FC = 1.2; q = 8.5 × 10−10) were notably enriched in genes differentially expressed at the posterior foregut stage (q = 0.002), as calculated by gene set enrichment analyses. In a complementary analysis of enrichment, genes differentially expressed in the final, beta-like cell stage of in vitro differentiation were significantly enriched (hypergeometric test, permuted p value <0.05) for genes within the credible intervals of type 2 diabetes GWAS loci.

Conclusions/interpretation

The present study characterises RNA expression profiles during human islet differentiation, identifies potential transcriptional regulators of the differentiation process, and suggests that the inherited predisposition to type 2 diabetes is partly mediated through modulation of islet development.

Data availability

Sequence data for this study has been deposited at the European Genome-phenome Archive (EGA), under accession number EGAS00001002721.
Appendix
Available only for authorised users
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Metadata
Title
Patterns of differential gene expression in a cellular model of human islet development, and relationship to type 2 diabetes predisposition
Authors
Marta Perez-Alcantara
Christian Honoré
Agata Wesolowska-Andersen
Anna L. Gloyn
Mark I. McCarthy
Mattias Hansson
Nicola L. Beer
Martijn van de Bunt
Publication date
01-07-2018
Publisher
Springer Berlin Heidelberg
Published in
Diabetologia / Issue 7/2018
Print ISSN: 0012-186X
Electronic ISSN: 1432-0428
DOI
https://doi.org/10.1007/s00125-018-4612-4

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