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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

Zbtb4 represses transcription of P21CIP1 and controls the cellular response to p53 activation

Axel Weber1, Judith Marquardt, David Elzi

  • 1Institute of Molecular Biology and Tumour Research (IMT), Marburg, Germany.

The EMBO Journal
|May 3, 2008
PubMed

Insights

Zbtb4 protein represses P21CIP1 expression, influencing cell fate after p53 activation. Its downregulation in tumors suggests Zbtb4 is crucial for cell cycle arrest and survival.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Cellular responses to p53 activation, such as apoptosis or cell cycle arrest, are determined by specific p53 target gene patterns.
  • Zbtb4 is a transcriptional repressor protein implicated in gene regulation.

Purpose of the Study:

  • To investigate the role of Zbtb4 in the cellular response to p53 activation.
  • To elucidate the mechanism by which Zbtb4 influences apoptosis and cell cycle arrest.

Main Methods:

  • Assessed Zbtb4's association with the Sin3/histone deacetylase co-repressor and its complex formation with Miz1.
  • Examined ZBTB4 expression in human tumors.
  • Investigated the effects of Zbtb4 depletion on cell cycle arrest and apoptosis in response to p53 activation.

Main Results:

  • Zbtb4, as a heterodimeric complex with Miz1, represses P21CIP1 expression.
  • ZBTB4 expression is downregulated in advanced human tumors.
  • Depletion of Zbtb4 promotes cell cycle arrest and suppresses apoptosis upon p53 activation, facilitating cell survival via P21CIP1 regulation.

Conclusions:

  • Zbtb4 acts as a critical determinant of the cellular response to p53 activation.
  • P21CIP1 can provide an essential survival signal in cells with activated p53, mediated by Zbtb4's regulatory function.

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