Genome-Wide Association Analysis of Pancreatic Beta-Cell Glucose Sensitivity

Harshal A Deshmukh, Anne Lundager Madsen, Ana Viñuela, Christian Theil Have, Niels Grarup, Andrea Tura, Anubha Mahajan, Alison J Heggie, Robert W Koivula, Federico De Masi, Konstantinos K Tsirigos, Allan Linneberg, Thomas Drivsholm, Oluf Pedersen, Thorkild I A Sørensen, Arne Astrup, Anette A P Gjesing, Imre Pavo, Andrew R Wood, Hartmut RuettenAngus G Jones, Anitra D M Koopman, Henna Cederberg, Femke Rutters, Martin Ridderstrale, Markku Laakso, Mark I McCarthy, Tim M Frayling, Ele Ferrannini, Paul W Franks, Ewan R Pearson, Andrea Mari, Torban Hansen, Mark Walker

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Abstract

Context: Pancreatic beta-cell glucose sensitivity is the slope of the plasma glucose-insulin secretion relationship and is a key predictor of deteriorating glucose tolerance and development of type 2 diabetes. However, there are no large-scale studies looking at the genetic determinants of beta cell glucose sensitivity.

Objective: To understand the genetic determinants of pancreatic beta-cell glucose sensitivity using genome-wide meta-analysis and candidate gene studies.

Design: We performed a genome-wide meta-analysis for beta-cell glucose sensitivity in subjects with type 2 diabetes and non-diabetic subjects from 6 independent cohorts (n=5,706). Beta-cell glucose sensitivity was calculated from mixed-meal and oral glucose tolerance tests, and its associations between known glycaemia related SNPS and GWAS SNPs were estimated using linear regression models.

Results: Beta-cell glucose sensitivity was moderately heritable (h2 ranged between 34 to 55%) using SNP and family-based analyses. GWAS meta-analysis identified multiple correlated SNPs in the CDKAL1 gene and GIPR-QPCTL gene loci that reached genome-wide significance, with SNP rs2238691 in GIPR-QPCTL (P-value=2.64x10-9) and rs9368219 in the CDKAL1 (P-value=3.15x10-9) showing the strongest association with beta-cell glucose sensitivity. These loci surpassed genome-wide significance when the GWAS meta-analysis was repeated after exclusion of the diabetic subjects. After correction for multiple testing, glycemia associated SNPs in or near the HHEX and IGF2B2 loci were also associated with beta-cell glucose sensitivity.

Conclusion: We show that, variation at the GIPR-QPCTL and CDKAL1 loci are key determinants of pancreatic beta cell glucose sensitivity.

OriginalsprogEngelsk
TidsskriftJournal of Clinical Endocrinology and Metabolism
Vol/bind106
Udgave nummer1
Sider (fra-til)80-90
Antal sider11
ISSN0021-972X
DOI
StatusUdgivet - 2021

Bibliografisk note

CURIS 2021 NEXS 070

Emneord

  • Det Natur- og Biovidenskabelige Fakultet

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