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Leif Groop

Leif Groop

Principal investigator

Leif Groop

The rs7903146 variant in the tcf7l2 gene increases the risk of prediabetes/type 2 diabetes in obese adolescents by impairing b-cell function and hepatic insulin sensitivity


  • Catrina Cropano
  • Nicola Santoro
  • Leif Groop
  • Chiara Dalla Man
  • Claudio Cobelli
  • Alfonso Galderisi
  • Romy Kursawe
  • Bridget Pierpont
  • Martina Goffredo
  • Sonia Caprio

Summary, in English

OBJECTIVE In this study, we aimed to explore the mechanism by which TCF7L2 rs7903146 risk allele confers susceptibility to impaired glucose tolerance (IGT) or type 2 diabetes (T2D) in obese adolescents. RESEARCH DESIGN AND METHODS The rs7903146 variant in the TCF7L2 gene was genotyped in a multiethnic cohort of 955 youths. All subjects underwent an oral glucose tolerance test with the use of the Oral Minimal Model to assess insulin secretion, and 33 subjects underwent a hyperinsulinemic-euglycemic clamp. In 307 subjects, a follow-up oral glucose tolerance test was repeated after 3.11 6 2.36 years. RESULTS The TCF7L2 rs7903146 risk allele was associated with higher 2-h glucose levels in Caucasians (P = 0.006) and African Americans (P = 0.009), and a trendwas seen also in Hispanics (P = 0.072). Also, the T allele was associated with decreased b-cell responsivity and IGT (P < 0.05). Suppression of endogenous hepatic glucose productionwas lower in subjects with the risk variant (P = 0.006). Finally, the odds of showing IGT/T2D at follow-up were higher in subjects carrying the minor allele (odds ratio 2.224; 95% CI 1.370-3.612; P = 0.0012). CONCLUSIONS The rs7903146 variant in the TCF7L2 gene increases the risk of IGT/T2D in obese adolescents by impairing b-cell function, and hepatic insulin sensitivity predicts the development of IGT/T2D over time.


  • Genomics, Diabetes and Endocrinology
  • EXODIAB: Excellence of Diabetes Research in Sweden

Publishing year







Diabetes Care





Document type

Journal article


American Diabetes Association


  • Endocrinology and Diabetes



Research group

  • Genomics, Diabetes and Endocrinology


  • ISSN: 0149-5992