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TCF7L2 Polymorphism, Weight Loss and Proinsulin: Insulin Ratio in the Diabetes Prevention Program

Author:
  • Jeanne M. McCaffery
  • Kathleen A. Jablonski
  • Paul Franks
  • Sam Dagogo-Jack
  • Rena R. Wing
  • William C. Knowler
  • Linda Delahanty
  • Dana Dabelea
  • Richard Hamman
  • Alan R. Shuldiner
  • Jose C. Florez
Publishing year: 2011
Language: English
Publication/Series: PLoS ONE
Volume: 6
Issue: 7
Document type: Journal article
Publisher: Public Library of Science

Abstract english

Aims: TCF7L2 variants have been associated with type 2 diabetes, body mass index (BMI), and deficits in proinsulin processing and insulin secretion. Here we sought to test whether these effects were apparent in high-risk individuals and modify treatment responses. Methods: We examined the potential role of the TCF7L2 rs7903146 variant in predicting resistance to weight loss or a lack of improvement of proinsulin processing during 2.5-years of follow-up participants (N = 2,994) from the Diabetes Prevention Program (DPP), a randomized controlled trial designed to prevent or delay diabetes in high-risk adults. Results: We observed no difference in the degree of weight loss by rs7903146 genotypes. However, the T allele (conferring higher risk of diabetes) at rs7903146 was associated with higher fasting proinsulin at baseline (P, 0.001), higher baseline proinsulin: insulin ratio (p<0.0001) and increased proinsulin: insulin ratio over a median of 2.5 years of follow-up (P = 0.003). Effects were comparable across treatment arms. Conclusions: The combination of a lack of impact of the TCF7L2 genotypes on the ability to lose weight, but the presence of a consistent effect on the proinsulin: insulin ratio over the course of DPP, suggests that high-risk genotype carriers at this locus can successfully lose weight to counter diabetes risk despite persistent deficits in insulin production.

Keywords

  • Endocrinology and Diabetes

Other

Published
  • Genetic and Molecular Epidemiology
  • ISSN: 1932-6203
Paul Franks
E-mail: paul [dot] franks [at] med [dot] lu [dot] se

Principal investigator

Genetic and Molecular Epidemiology

+46 40 39 11 49

60-12-021

33

Lund University Diabetes Centre, CRC, SUS Malmö, Entrance 72, House 91:12. SE-205 02 Malmö. Telephone: +46 40 39 10 00