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Related Experiment Videos

Cyclin D1 represses the basic helix-loop-helix transcription factor, BETA2/NeuroD.

Christelle Ratineau1, Mary W Petry, Hiroyuki Mutoh

  • 1Division of Gastroenterology, GRASP Digestive Disease Center, New England Medical Center/Tufts University School of Medicine, Boston, Massachusetts 02111, USA.

The Journal of Biological Chemistry
|January 15, 2002
PubMed
Summary

Cyclin D1 inhibits secretin gene expression in intestinal cells by repressing BETA2/NeuroD activity. This mechanism prevents immature cells from differentiating and expressing the secretin hormone.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Gastroenterology

Background:

  • Secretin hormone expression is confined to differentiated intestinal cells.
  • Cellular differentiation is linked to cell cycle arrest.
  • BETA2/NeuroD promotes cell cycle withdrawal and secretin gene expression.

Purpose of the Study:

  • To investigate the role of cyclin D1 in regulating secretin gene transcription.
  • To determine how cyclin D1 affects BETA2/NeuroD-mediated differentiation.
  • To understand the molecular mechanism of cyclin D1 repression.

Main Methods:

  • Analysis of cyclin D1 and BETA2/NeuroD interaction in vivo.
  • Study of cyclin D1's effect on BETA2/NeuroD-dependent secretin gene transcription.
  • Examination of cyclin box mutants and p300 coactivator binding.

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Main Results:

  • Cyclin D1 represses BETA2/NeuroD-dependent secretin gene transcription.
  • Repression by cyclin D1 is independent of its cell cycle effects.
  • Cyclin D1 associates with BETA2/NeuroD, possibly via the p300 coactivator.

Conclusions:

  • Cyclin D1 acts as a repressor of secretin gene expression in the intestine.
  • Cyclin D1 likely prevents premature differentiation in proliferating intestinal progenitor cells.
  • This regulation ensures secretin expression occurs only in terminally differentiated villus cells.