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

Published on: August 4, 2019

The physiological relevance of downstream effectors of p53 activity

Vinod Pant1, Sydney M Moyer1, Mitheera V1

  • 1Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030.

Proceedings of the National Academy of Sciences of the United States of America
|June 16, 2026
PubMed

Insights

The tumor suppressor TP53 regulates gene expression. This study found cell cycle regulators, not apoptosis genes, drive TP53-induced lethality in mice, with p21 loss rescuing the effect.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • The TP53 tumor suppressor is a transcription factor regulating numerous genes.
  • Previous studies identified a conserved p53-dependent transcriptional signature including Cdkn1A (p21), Gtse1, and Eda2r.
  • Bbc3 (Puma) is a p53 target involved in apoptosis.

Purpose of the Study:

  • To investigate the physiological roles of p53 target genes Cdkn1A (p21), Gtse1, Eda2r, and Bbc3 as effectors of p53 activity.
  • To determine the contribution of these genes to p53-mediated phenotypes and lethality.
  • To elucidate the mechanisms underlying TP53-induced pathologies.

Main Methods:

  • Generation of novel mouse alleles for Gtse1 (Gtse1Δ7) and Eda2r (Eda2rΔ11).
  • Phenotypic analysis of Gtse1Δ7 and Eda2rΔ11 mutant mice, including spermatogenesis and liver function.
  • Cross-breeding mutant mice with an Mdm2-deletion model exhibiting constitutive p53 activation and lethality.
  • Assessing the impact of genetic loss of p53 target genes on the lethality phenotype.

Main Results:

  • Gtse1Δ7 and Eda2rΔ11 mice displayed specific defects: spermatogenesis and liver abnormalities, respectively.
  • Loss of p21 fully rescued the lethality associated with constitutive p53 activation in vivo.
  • The Gtse1Δ7 mutation partially rescued lethality, while Eda2rΔ11 and Bbc3 loss showed no rescue effect.

Conclusions:

  • Cell cycle regulators, particularly p21, are the primary drivers of sustained p53-induced gastrointestinal defects and lethality.
  • Apoptosis-related genes like Bbc3 are not the main effectors of TP53-induced lethality in this context.
  • These findings highlight the critical role of cell cycle control in mediating the detrimental effects of chronic p53 activation.
Keywords:
Eda2rGtse1Mdm2mouse modelsp21 transcription

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