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Related Experiment Video

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Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Revealing a human p53 universe.

Thuy-Ai T Nguyen1, Sara A Grimm2, Pierre R Bushel3

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|August 15, 2018
PubMed
Summary
This summary is machine-generated.

This study maps the p53 protein’s DNA binding across the human genome, revealing over 900 direct gene targets. It clarifies how DNA binding affects gene expression, highlighting p53’s broad role in maintaining cellular balance.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cancer Research

Background:

  • p53 transcriptional networks are understood, but in vivo DNA interactions and transcriptional effects in humans are not fully characterized.
  • A comprehensive understanding of p53's genome-wide binding and its influence on gene expression across diverse biological contexts is needed.

Purpose of the Study:

  • To globally characterize p53 DNA binding and its relationship with gene expression in human biological systems.
  • To investigate the impact of DNA sequence variations (spacers and mismatches) on p53 binding in vivo.
  • To identify core and context-specific p53 target genes and elucidate p53's functional roles.

Main Methods:

  • Analysis of 41 genome-wide ChIP-seq datasets, including gene expression data from 16 studies.
  • Development of a common analysis pipeline for consistent data interpretation.
  • Utilized the p53 BAER hub and UCSC browser for data visualization and accessibility.

Main Results:

  • Characterized a large p53 genome-wide cistrome of over 900 directly targeted genes.
  • Established that DNA spacers and mismatches affect p53 binding but not significantly the likelihood of expression once bound.
  • Identified a core cistrome signature and cell- or treatment-specific signatures, revealing new p53 functions.

Conclusions:

  • p53 plays a broad homeostatic role in human cells, impacting a wide range of biological processes.
  • The findings provide a robust platform for basic and translational research on p53.
  • Understanding p53's genome-wide interactions is crucial for deciphering its multifaceted roles in health and disease.