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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

A genomewide study identifies the Wnt signaling pathway as a major target of p53 in murine embryonic stem cells

Kyoung-Hwa Lee1, Mangmang Li, Aleksandra M Michalowski

  • 1Laboratory of Cancer Biology and Genetics, National Cancer Institute, Bethesda, MD 20892, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 19, 2009
PubMed

Insights

The tumor suppressor p53 directly regulates the Wnt signaling pathway in mouse embryonic stem cells (mESCs), exhibiting an unexpected role in preventing differentiation. This finding reveals a novel crosstalk between p53 and Wnt signaling in mESC regulation.

Area of Science:

  • Stem Cell Biology
  • Molecular Biology
  • Cell Signaling

Background:

  • p53 and Wnt signaling are crucial for mouse embryonic stem cell (mESC) differentiation.
  • The functional crosstalk between p53 and Wnt signaling in mESCs remains largely unexplored.

Purpose of the Study:

  • To investigate the direct and functional relationship between p53 and the Wnt signaling pathway in mESCs.
  • To elucidate the role of p53 in regulating Wnt signaling and its impact on mESC differentiation.

Main Methods:

  • Chromatin-immunoprecipitation-based microarray (ChIP-chip) assays.
  • Gene expression microarray analysis.
  • Analysis of conditioned medium from UV-treated mESCs.

Main Results:

  • The Wnt signaling pathway is significantly overrepresented in p53-regulated genes in mESCs.
  • p53 induces the expression of five Wnt ligand genes in a mESC-specific manner.
  • p53 activation in mESCs leads to an anti-differentiation effect mediated by Wnt signaling.

Conclusions:

  • p53 directly regulates the Wnt signaling pathway in mESCs, revealing a novel anti-differentiation function.
  • This study uncovers a direct functional connection between p53 and Wnt signaling in the context of mESC differentiation.
  • p53 exhibits dual roles in mESCs, regulating both differentiation and anti-differentiation programs.

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