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Role Of Notch Signalling In Intestinal Stem Cell Renewal01:12

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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
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Published on: April 1, 2021

Polycomb repressive complex 2 impedes intestinal cell terminal differentiation.

Yannick D Benoit1, Manon B Lepage, Taoufik Khalfaoui

  • 1CIHR Team on the Digestive Epithelium, Département d'Anatomie et Biologie Cellulaire, Faculté de Médecine et des Sciences de la Santé, Université de Sherbrooke, Sherbrooke, QC, Canada.

Journal of Cell Science
|April 3, 2012
PubMed
Summary
This summary is machine-generated.

Polycomb group (PcG) proteins, including SUZ12 in the polycomb repressive complex 2 (PRC2), repress intestinal cell differentiation. Disrupting PRC2 accelerates differentiation, revealing its role in regulating the enterocytic differentiation program.

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Last Updated: May 23, 2026

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Published on: November 21, 2015

Area of Science:

  • Cell Biology
  • Epigenetics
  • Gastroenterology

Background:

  • The crypt-villus axis is crucial for small intestine function, with stem cells in crypts and mature cells on villi.
  • Polycomb group (PcG) proteins are known to maintain stem cell self-renewal by repressing differentiation.
  • Emerging evidence suggests PcGs also regulate differentiation processes.

Purpose of the Study:

  • To investigate the role of PcG proteins, specifically SUZ12 within the polycomb repressive complex 2 (PRC2), in intestinal epithelial cell proliferation and differentiation.
  • To analyze the expression of SUZ12 in human intestinal tissues and colorectal cancers.

Main Methods:

  • RNAi-mediated stable knockdown of SUZ12 in intestinal epithelial cell models.
  • Analysis of intestinal cell proliferation and differentiation markers.
  • Investigation of SUZ12 expression in human intestinal tissues and colorectal cancer samples.

Main Results:

  • SUZ12 knockdown (PRC2 disruption) in intestinal cell models led to precocious expression of terminal differentiation markers.
  • SUZ12 is expressed in proliferative epithelial cells of the intestinal crypt.
  • SUZ12 expression is elevated in colorectal cancers.

Conclusions:

  • PcG proteins, via PRC2 and SUZ12, actively repress the enterocytic differentiation program.
  • This mechanism likely slows down terminal differentiation in the transit amplifying cell population in vivo.
  • PcG proteins play a dual role in maintaining stemness and regulating differentiation in the intestinal epithelium.