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Distinct p53 isoforms code for opposing transcriptional outcomes.

Annika Wylie1, Amanda E Jones1, Simanti Das1

  • 1Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

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|July 12, 2022
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Summary
This summary is machine-generated.

p53 proteins can activate or repress gene activity. This study reveals p53 isoforms act as continuous repressors in Drosophila, impacting germ cell formation and tumor suppression.

Keywords:
Chk2DNA binding motifDrosophilabiosensorchromatin modificationscorollap53p53 isoformstransactivationtransrepression

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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • p53 proteins are known transcriptional activators responding to cellular stress.
  • The mechanisms by which p53 downregulates gene expression are poorly understood and often presumed indirect.
  • Opposing transcriptional roles of p53 require in vivo investigation.

Purpose of the Study:

  • To investigate the mechanisms of p53-mediated transcriptional repression in Drosophila.
  • To examine the opposing features of p53 transcriptional control in vivo.
  • To understand the role of specific p53 isoforms in gene regulation and development.

Main Methods:

  • Analysis of synthetic and native cis-regulatory elements in Drosophila.
  • Assessment of p53 binding sites and their role in transactivation and repression.
  • Correlation of repression with H3K9me3 chromatin marks.
  • Isoform-specific knockouts to dissociate transcriptional activities.

Main Results:

  • Transcriptional repression by p53 occurs constitutively via canonical DNA binding sites.
  • p53-mediated repression is linked to H3K9me3 marks and does not require stress or Chk2.
  • Two p53 isoforms function as repressors, while a third acts as an activator.
  • Isoform-specific knockouts demonstrate critical roles for repression in germ cell formation.

Conclusions:

  • Certain p53 isoforms function as constitutive, tissue-specific transcriptional repressors.
  • p53's dual role in gene regulation is isoform-dependent.
  • Findings have significant implications for understanding p53's tumor suppressor functions in humans.