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Type: Journal article
Title: Genome-wide association identifies nine common variants associated with fasting proinsulin levels and provides new insights into the pathophysiology of type 2 diabetes
Author: Strawbridge, R.
Dupuis, J.
Prokopenko, I.
Barker, A.
Ahlqvist, E.
Rybin, D.
Petrie, J.
Travers, M.
Bouatia-Naji, N.
Dimas, A.
Nica, A.
Wheeler, E.
Chen, H.
Voight, B.
Taneera, J.
Kanoni, S.
Peden, J.
Turrini, F.
Gustafsson, S.
Zabena, C.
et al.
Citation: Diabetes, 2011; 60(10):2624-2634
Publisher: American Diabetes Association
Issue Date: 2011
ISSN: 0012-1797
Statement of
Rona J. Strawbridge ... DIAGRAM Consortium, the GIANT Consortium, the MuTHER Consortium, the CARDIoGRAM Consortium, the C4D Consortium ... et al.
Abstract: OBJECTIVE Proinsulin is a precursor of mature insulin and C-peptide. Higher circulating proinsulin levels are associated with impaired β-cell function, raised glucose levels, insulin resistance, and type 2 diabetes (T2D). Studies of the insulin processing pathway could provide new insights about T2D pathophysiology. RESEARCH DESIGN AND METHODS We have conducted a meta-analysis of genome-wide association tests of ∼2.5 million genotyped or imputed single nucleotide polymorphisms (SNPs) and fasting proinsulin levels in 10,701 nondiabetic adults of European ancestry, with follow-up of 23 loci in up to 16,378 individuals, using additive genetic models adjusted for age, sex, fasting insulin, and study-specific covariates. RESULTS Nine SNPs at eight loci were associated with proinsulin levels (P < 5 × 10−8). Two loci (LARP6 and SGSM2) have not been previously related to metabolic traits, one (MADD) has been associated with fasting glucose, one (PCSK1) has been implicated in obesity, and four (TCF7L2, SLC30A8, VPS13C/C2CD4A/B, and ARAP1, formerly CENTD2) increase T2D risk. The proinsulin-raising allele of ARAP1 was associated with a lower fasting glucose (P = 1.7 × 10−4), improved β-cell function (P = 1.1 × 10−5), and lower risk of T2D (odds ratio 0.88; P = 7.8 × 10−6). Notably, PCSK1 encodes the protein prohormone convertase 1/3, the first enzyme in the insulin processing pathway. A genotype score composed of the nine proinsulin-raising alleles was not associated with coronary disease in two large case-control datasets. CONCLUSIONS We have identified nine genetic variants associated with fasting proinsulin. Our findings illuminate the biology underlying glucose homeostasis and T2D development in humans and argue against a direct role of proinsulin in coronary artery disease pathogenesis.
Keywords: DIAGRAM Consortium; GIANT Consortium; MuTHER Consortium; CARDIoGRAM Consortium; C4D Consortium; Humans; Diabetes Mellitus, Type 2; Insulin; Proinsulin; Fasting; Genotype; Polymorphism, Single Nucleotide; Genome, Human; Adult; Female; Male; Genetic Variation
Description: University of Adelaide Author: Lyle J. Palmer of the GIANT Consortium
Rights: © 2011 by the American Diabetes Association. Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See -nc-nd/3.0/ for details.
RMID: 0020137830
DOI: 10.2337/db11-0415
Appears in Collections:Translational Health Science publications

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