Common single nucleotide polymorphisms in TCF7L2 are reproducibly associated with type 2 diabetes and reduce the insulin response to glucose in nondiabetic individuals

Richa Saxena, Lauren Gianniny, Noel P. Burtt, Valeriya Lyssenko, Candace Giuducci, Marketa Sjögren, Jose C. Florez, Peter Almgren, Bo Isomaa, Marju Orho-Melander, Ulf Lindblad, Mark J. Daly, Tiinamaija Tuomi, Joel N. Hirschhorn, Kristin G. Ardlie, Leif Groop, David Altshuler

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, common noncoding variants in the TCF7L2 gene were strongly associated with increased risk of type 2 diabetes in samples from Iceland, Denmark, and the U.S. We genotyped 13 single nucleotide polymorphisms (SNPs) across TCF7L2 in 8,310 individuals in family-based and case-control designs from Scandinavia, Poland, and the U.S. We convincingly confirmed the previous association of TCF7L2 SNPs with the risk of type 2 diabetes (rs7903146T odds ratio 1.40 [95% CI 1.30-1.50], P = 6.74 x 10(-20)). In nondiabetic individuals, the risk genotypes were associated with a substantial reduction in the insulinogenic index derived from an oral glucose tolerance test (risk allele homozygotes have half the insulin response to glucose of noncarriers, P = 0.003) but not with increased insulin resistance. These results suggest that TCF7L2 variants may act through insulin secretion to increase the risk of type 2 diabetes.
Original languageEnglish
Pages (from-to)2890-2895
JournalDiabetes
Volume55
Issue number10
DOIs
Publication statusPublished - 2006

Subject classification (UKÄ)

  • Endocrinology and Diabetes

Fingerprint

Dive into the research topics of 'Common single nucleotide polymorphisms in TCF7L2 are reproducibly associated with type 2 diabetes and reduce the insulin response to glucose in nondiabetic individuals'. Together they form a unique fingerprint.

Cite this