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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

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p53 deficiency triggers dysregulation of diverse cellular processes in physiological oxygen

Liz J Valente1, Amy Tarangelo2, Albert Mao Li1

  • 1Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA.

The Journal of Cell Biology
|September 4, 2020
PubMed

Insights

The tumor suppressor protein p53 (encoded by the TP53 gene) regulates many cellular processes to prevent cancer. Loss of p53 impacts numerous cellular functions, explaining its frequent mutation in human cancers.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The tumor suppressor gene TP53, encoding the p53 protein, is the most frequently mutated gene in human cancers.
  • p53's role in tumor suppression is complex, with various cellular mechanisms proposed for its function.
  • Understanding the comprehensive mechanisms of p53-mediated tumor suppression is crucial.

Purpose of the Study:

  • To investigate whether p53 regulates a wide range of cellular processes during tumor suppression.
  • To identify cellular processes affected by p53 loss under physiological oxygen conditions.
  • To uncover novel functions of p53 in cancer suppression.

Main Methods:

  • Comparative analysis of mouse and human oncogene-expressing wild-type and p53-deficient cells.
  • Cellular analysis conducted under physiological oxygen conditions.
  • Transcriptomic analysis to identify modulated gene expression patterns.

Main Results:

  • p53 loss concurrently impacts multiple cellular processes, including apoptosis, genome stabilization, DNA repair, metabolism, migration, and invasion.
  • Specific cellular phenotypes associated with p53 loss were identified only under physiological oxygen.
  • Transcriptomic analysis revealed p53's modulation of underappreciated functions, such as actin dynamics.

Conclusions:

  • p53 simultaneously governs a diverse array of cellular processes critical for suppressing cellular transformation.
  • The broad cellular regulatory role of p53 provides a strong rationale for its frequent inactivation in human cancers.
  • These findings deepen the understanding of p53's multifaceted role in tumor suppression.

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