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Nuclear factors and type 2 diabetes

P Froguel1

  • 1Department of Human Genetics, Pasteur Institute, Lille, France. froguel@xenope.pasteur-lille.fr

Schweizerische Medizinische Wochenschrift
|January 15, 1999
PubMed
Summary

Mutations in key transcription factors cause MODY, a form of diabetes. These genetic defects in hepatocyte nuclear factors and insulin promoter factor-1 also contribute to late-onset type 2 diabetes, suggesting a broader role for these factors.

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Area of Science:

  • Genetics
  • Endocrinology
  • Molecular Biology

Background:

  • Mutations in transcription factors like HNF-4 alpha, HNF-1 alpha, HNF-1 beta, and IPF-1 are linked to Maturity Onset Diabetes of the Young (MODY).
  • MODY accounts for 2-5% of type 2 diabetes cases, characterized by early onset and autosomal dominant inheritance.
  • HNF-1 beta mutations are associated with MODY and severe kidney disease, impacting insulin secretion and causing hyperglycemia.

Purpose of the Study:

  • To investigate the role of islet transcription factor defects in both MODY and late-onset type 2 diabetes.
  • To explore the genetic basis of diabetes beyond typical classifications.

Main Methods:

  • Analysis of mutations in the coding regions and promoters of HNF-4 alpha, HNF-1 alpha, HNF-1 beta, and IPF-1.
  • Review of genetic data from families with MODY and late-onset type 2 diabetes.

Main Results:

  • Mutations in these transcription factors lead to severe insulin secretory defects and hyperglycemia.
  • HNF-1 beta mutations are found in MODY patients with severe kidney disease.
  • Mutations in HNF-1 alpha, HNF-4 alpha, and IPF-1 were identified in families with late-onset type 2 diabetes.

Conclusions:

  • Transcription factor defects are a significant cause of MODY and contribute to hyperglycemia and microvascular complications.
  • Evidence suggests the existence of non-MODY, monofactorial forms of late-onset type 2 diabetes resulting from islet transcription factor defects.

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