Diabetes-associated variation in TCF7L2 is not associated with hepatic or extrahepatic insulin resistance

Ron T. Varghese, Ivan Viegas, Cristina Barosa, Catia Marques, Meera Shah, Robert A. Rizza, John G. Jones, Adrian Vella

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

A common genetic variation in TCF7L2 is associated with type 2 diabetes. However, the mechanism by which this occurs remains elusive. In addition to affecting insulin secretion, genetic variation at the TCF7L2 locus may alter insulin action or directly modify hepatic glucose metabolism. We sought to determine whether the diabetes-associated variant in this locus (the T allele of rs7903146) increases fasting endogenous glucose production (EGP), and impairs insulin-induced suppression of EGP and insulin-stimulated glucose disappearance. To address this, we studied individuals who were either homozygous for the diabetes-associated allele (TT) at rs7903146 or were homozygous for the protective allele (CC). Subjects were matched for other anthropometric characteristics and were studied using a euglycemic clamp. EGP and glucose uptake were measured using the tracer dilution technique, and the relative contribution of gluconeogenesis to EGP was quantitated using deu-terated water corrected for transaldolase exchange. We report that the diabetes-associated variation in TCF7L2 did not associate with fasting EGP, insulin-induced suppression of EGP, and insulin-induced stimulation of glucose uptake. There was no association with the contribution of gluconeogenesis and glycogenolysis to EGP. These data indicate that genetic variation at TCF7L2 does not predispose an individual to type 2 diabetes by altering either hepatic or extrahepatic insulin action.

Original languageEnglish (US)
Pages (from-to)887-892
Number of pages6
JournalDiabetes
Volume65
Issue number4
DOIs
StatePublished - Apr 1 2016

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

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    Varghese, R. T., Viegas, I., Barosa, C., Marques, C., Shah, M., Rizza, R. A., Jones, J. G., & Vella, A. (2016). Diabetes-associated variation in TCF7L2 is not associated with hepatic or extrahepatic insulin resistance. Diabetes, 65(4), 887-892. https://doi.org/10.2337/db15-1593