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Integrative network analysis highlights biological processes underlying GLP-1 stimulated insulin secretion: A DIRECT study.

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Title: Integrative network analysis highlights biological processes underlying GLP-1 stimulated insulin secretion: A DIRECT study.
Authors: Gudmundsdottir, V
Pedersen, HK
Allebrandt, KV
Brorsson, C
Van Leeuwen, N
Banasik, K
Mahajan, A
Groves, CJ
Van de Bunt, M
Dawed, AY
Fritsche, A
Staiger, H
Simonis-Bik, AMC
Deelen, J
Kramer, MHH
Dietrich, A
Hübschle, T
Willemsen, G
Häring, H-U
De Geus, EJC
Boomsma, DI
Eekhoff, EMW
Ferrer, J
McCarthy, MI
Pearson, ER
Gupta, R
Brunak, S
't Hart, LM
Item Type: Journal Article
Abstract: Glucagon-like peptide 1 (GLP-1) stimulated insulin secretion has a considerable heritable component as estimated from twin studies, yet few genetic variants influencing this phenotype have been identified. We performed the first genome-wide association study (GWAS) of GLP-1 stimulated insulin secretion in non-diabetic individuals from the Netherlands Twin register (n = 126). This GWAS was enhanced using a tissue-specific protein-protein interaction network approach. We identified a beta-cell protein-protein interaction module that was significantly enriched for low gene scores based on the GWAS P-values and found support at the network level in an independent cohort from Tübingen, Germany (n = 100). Additionally, a polygenic risk score based on SNPs prioritized from the network was associated (P < 0.05) with glucose-stimulated insulin secretion phenotypes in up to 5,318 individuals in MAGIC cohorts. The network contains both known and novel genes in the context of insulin secretion and is enriched for members of the focal adhesion, extracellular-matrix receptor interaction, actin cytoskeleton regulation, Rap1 and PI3K-Akt signaling pathways. Adipose tissue is, like the beta-cell, one of the target tissues of GLP-1 and we thus hypothesized that similar networks might be functional in both tissues. In order to verify peripheral effects of GLP-1 stimulation, we compared the transcriptome profiling of ob/ob mice treated with liraglutide, a clinically used GLP-1 receptor agonist, versus baseline controls. Some of the upstream regulators of differentially expressed genes in the white adipose tissue of ob/ob mice were also detected in the human beta-cell network of genes associated with GLP-1 stimulated insulin secretion. The findings provide biological insight into the mechanisms through which the effects of GLP-1 may be modulated and highlight a potential role of the beta-cell expressed genes RYR2, GDI2, KIAA0232, COL4A1 and COL4A2 in GLP-1 stimulated insulin secretion.
Issue Date: 1-Jan-2018
Date of Acceptance: 4-Dec-2017
URI: http://hdl.handle.net/10044/1/55950
DOI: https://dx.doi.org/10.1371/journal.pone.0189886
ISSN: 1932-6203
Publisher: Public Library of Science (PLoS)
Journal / Book Title: PLoS ONE
Volume: 13
Issue: 1
Copyright Statement: © 2018 Gudmundsdottir et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Keywords: MD Multidisciplinary
General Science & Technology
Publication Status: Published
Open Access location: http://10.13711journal.pone.0189886/
Article Number: e0189886
Appears in Collections:Department of Medicine (up to 2019)