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Common Missense Variant in the Glucokinase Regulatory Protein Gene Is Associated With Increased Plasma Triglyceride and C-Reactive Protein but Lower Fasting Glucose Concentrations

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Author

  • Marju Orho-Melander
  • Olle Melander
  • Candace Guiducci
  • Pablo Perez-Martinez
  • Dolores Corella
  • Charlotta Roos
  • Ryan Tewhey
  • Mark J. Rieder
  • Jennifer Hall
  • Goncalo Abecasis
  • E. Shyong Tai
  • Cullan Welch
  • Donna K. Arnett
  • Valeriya Lyssenko
  • Eero Lindholm
  • Richa Saxena
  • Paul I. W. de Bakker
  • Noel Burtt
  • Benjamin F. Voight
  • Joel N. Hirschhorn
  • Katherine L. Tucker
  • Thomas Hedner
  • Tiinaimaija Tuomi
  • Bo Isomaa
  • Karl-Fredrik Eriksson
  • Marja-Riitta Taskinen
  • Bjoern Wahlstrand
  • Thomas E. Hughes
  • Laurence D. Parnell
  • Chao-Qiang Lai
  • Göran Berglund
  • Leena Peltonen
  • Erkki Vartiainen
  • Pekka Jousilahti
  • Aki S. Havulinna
  • Veikko Salomaa
  • Peter Nilsson
  • Leif Groop
  • David Altshuler
  • Jose M. Ordovas
  • Sekar Kathiresan
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Summary, in English

OBJECTIVE-Using the genome-wide association approach, we recently identified the glucokinase regulatory protein gene (GCKR, rs780094) region as a novel quantitative trait locus for plasma triglyceride concentration in Europeans. Here, we sought to study the association of GCKR variants with metabolic phenotypes, including measures of glucose homeostasis, to evaluate the GCYR locus in samples of non-European ancestry and to fine-map across the associated genomic interval. RESEARCH DESIGN AND METHODS-We performed association studies in 12 independent cohorts comprising >45,000 individuals representing several ancestral groups (whites from Northern and Southern Europe, whites from the U.S., African Americans from the U.S., Hispanics of Caribbean origin, and Chinese, Malays, and Asian Indians from Singapore). We conducted genetic fine-mapping across the similar to 417-kb region of linkage disequilibrium. spanning GCKR and 16 other genes on chromosome 2p23 by imputing untyped HapMap single nucleotide polymorphisms (SNPs) and genotyping 104 SNPs across the associated genomic interval. RESULTS-We provide comprehensive evidence that GCYR rs780094 is associated with opposite effects on fasting plasma triglyceride (P-meta = 3 x 10(-56)) and glucose (P-meta = 1 x 10(-13)) concentrations. In addition, we confirmed recent reports that the same SNP is associated with C-reactive protein (CRP) level (P = 5 x 10(-5)). Both fine-mapping approaches revealed a common missense GCKR variant (rs1260326, Pro446Leu, 34% frequency, r(2) = 0.93 with rs780094) as the strongest association signal in the region. CONCLUSIONS-These findings point to a molecular mechanism in humans by which higher triglycerides and CRP can be coupled with lower plasma glucose concentrations and position GCKR in central pathways regulating both hepatic triglyceride and glucose metabolism. Diabetes 57:3112-3121, 2008

Publishing year

2008

Language

English

Pages

3112-3121

Publication/Series

Diabetes

Volume

57

Issue

11

Document type

Journal article

Publisher

American Diabetes Association Inc.

Topic

  • Endocrinology and Diabetes

Status

Published

Research group

  • Genomics, Diabetes and Endocrinology
  • Cardiovascular Research - Hypertension
  • Vascular Diseases - Clinical Research
  • Internal Medicine - Epidemiology

ISBN/ISSN/Other

  • ISSN: 1939-327X