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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 genetic screen identifies TCF3/E2A and TRIAP1 as pathway-specific regulators of the cellular response to p53

Zdenek Andrysik1, Jihye Kim, Aik Choon Tan

  • 1Howard Hughes Medical Institute & Department of Molecular, Cellular and Developmental Biology, University of Colorado at Boulder, Boulder, CO 80309, USA.

Cell Reports
|May 21, 2013
PubMed

Insights

Researchers identified key regulators of the p53 pathway, uncovering TCF3/E2A and TRIAP1. Their findings offer strategies to direct p53-activated cells towards specific outcomes like cell-cycle arrest or apoptosis.

Area of Science:

  • Molecular Biology
  • Cellular Stress Response
  • Cancer Biology

Background:

  • The p53 transcription factor orchestrates critical cellular responses to stress, including cell-cycle arrest and apoptosis.
  • The precise molecular mechanisms dictating the specific outcome of p53 activation remain incompletely understood.
  • Understanding these mechanisms is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To identify novel pathway-specific coregulators of p53 target genes.
  • To differentiate regulators controlling cell-cycle arrest (p21) versus apoptosis (PUMA).
  • To elucidate strategies for manipulating p53-dependent cellular fate.

Main Methods:

  • Genome-wide genetic screen in human cells to identify p53 pathway coregulators.
  • Analysis of factors influencing the ratio of p21 (CDKN1A) to PUMA (BBC3) expression.
  • Functional assessment of identified factors (TCF3/E2A, TRIAP1) on p53-mediated cellular responses.

Main Results:

  • The transcription factor TCF3 (E2A) was identified as a driver of p21 expression and a repressor of PUMA across various cancer cell types.
  • Depletion of TCF3/E2A impairs p53-induced cell-cycle arrest and enhances apoptosis.
  • TRIAP1 was identified as a specific repressor of p21, and its depletion slows cell-cycle progression.

Conclusions:

  • TCF3/E2A and TRIAP1 are critical regulators that balance p53-mediated cell-cycle arrest and apoptosis.
  • The study reveals specific molecular strategies to steer p53-activated cells towards desired outcomes.
  • These findings have implications for designing therapies that selectively induce cell-cycle arrest or apoptosis in cancer cells.

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