Genetic Variants Associated With Fasting Glucose and Insulin Concentrations in an Ethnically Diverse Population: Results From the Population Architecture Using Genomics and Epidemiology (PAGE) Study

BMC Med Genet. 2013 Sep 25;14:98. doi: 10.1186/1471-2350-14-98.

Abstract

Background: Multiple genome-wide association studies (GWAS) within European populations have implicated common genetic variants associated with insulin and glucose concentrations. In contrast, few studies have been conducted within minority groups, which carry the highest burden of impaired glucose homeostasis and type 2 diabetes in the U.S.

Methods: As part of the 'Population Architecture using Genomics and Epidemiology (PAGE) Consortium, we investigated the association of up to 10 GWAS-identified single nucleotide polymorphisms (SNPs) in 8 genetic regions with glucose or insulin concentrations in up to 36,579 non-diabetic subjects including 23,323 European Americans (EA) and 7,526 African Americans (AA), 3,140 Hispanics, 1,779 American Indians (AI), and 811 Asians. We estimated the association between each SNP and fasting glucose or log-transformed fasting insulin, followed by meta-analysis to combine results across PAGE sites.

Results: Overall, our results show that 9/9 GWAS SNPs are associated with glucose in EA (p = 0.04 to 9 × 10-15), versus 3/9 in AA (p= 0.03 to 6 × 10-5), 3/4 SNPs in Hispanics, 2/4 SNPs in AI, and 1/2 SNPs in Asians. For insulin we observed a significant association with rs780094/GCKR in EA, Hispanics and AI only.

Conclusions: Generalization of results across multiple racial/ethnic groups helps confirm the relevance of some of these loci for glucose and insulin metabolism. Lack of association in non-EA groups may be due to insufficient power, or to unique patterns of linkage disequilibrium.

Publication types

  • Meta-Analysis
  • Research Support, American Recovery and Reinvestment Act
  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adaptor Proteins, Signal Transducing / genetics
  • Adult
  • African Americans / genetics
  • Aged
  • Alleles
  • Asian Continental Ancestry Group / genetics
  • Blood Glucose / analysis*
  • Diabetes Mellitus, Type 2 / epidemiology
  • Diabetes Mellitus, Type 2 / ethnology
  • Diabetes Mellitus, Type 2 / genetics
  • European Continental Ancestry Group / genetics
  • Female
  • Gene Frequency
  • Genetic Loci
  • Genome-Wide Association Study*
  • Genomics
  • Hispanic Americans / genetics
  • Humans
  • Indians, North American / genetics
  • Insulin / blood
  • Insulin / genetics*
  • Male
  • Middle Aged
  • Polymorphism, Single Nucleotide
  • Transcription Factor 7-Like 2 Protein / genetics

Substances

  • Adaptor Proteins, Signal Transducing
  • Blood Glucose
  • GCKR protein, human
  • Insulin
  • TCF7L2 protein, human
  • Transcription Factor 7-Like 2 Protein

Grant support