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Insulin gene: organisation, expression and regulation

E Dumonteil1, J Philippe

  • 1Diabétologie Clinique, Centre Médical Universitaire, Geneva, Switzerland.

Diabetes & Metabolism
|June 1, 1996
PubMed
Summary

Insulin gene expression is specific to pancreatic islet beta-cells in adults, regulated by transcription factors like IPF-1 and IEF1. Glucose and cAMP also modulate insulin gene transcription, impacting beta-cell function.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Insulin is a critical hormone for glucose homeostasis, produced by pancreatic islet beta-cells.
  • Insulin gene expression is tightly regulated, with distinct patterns during embryonic development and adulthood.

Purpose of the Study:

  • To review the mechanisms governing cell-specific expression and regulation of the insulin gene.
  • To elucidate the roles of transcription factors and signaling pathways in insulin gene control.

Main Methods:

  • Analysis of 5'-flanking sequences of the insulin gene promoter.
  • Identification and characterization of transcription factors (e.g., IEF1, IPF-1) binding to promoter elements (E and A boxes).
  • Review of studies on glucose and cAMP regulation of insulin gene transcription.

Main Results:

  • Beta-cell-specific expression is mediated by transcription factors binding to promoter motifs, notably IPF-1 and IEF1.
  • These factors are crucial for both beta-cell specificity and glucose responsiveness of the insulin gene.
  • The human insulin gene promoter contains a primate-specific polymorphic minisatellite potentially influencing regulation.

Conclusions:

  • Transcription factors IPF-1 and IEF1 are key determinants of insulin gene's beta-cell-specific expression and glucose regulation.
  • Understanding these regulatory mechanisms enhances knowledge of beta-cell differentiation and function.
  • Extrapancreatic insulin gene expression during embryogenesis warrants further investigation.

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