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E2F1 and E2F2 prevent replicative stress and subsequent p53-dependent organ involution.

A Iglesias-Ara1, O Zenarruzabeitia1, L Buelta2

  • 1Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country, UPV/EHU, Bilbao, Spain.

Cell Death and Differentiation
|February 7, 2015
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Summary
This summary is machine-generated.

Transcription factors E2F1 and E2F2 prevent organ damage by suppressing DNA replication stress. Their combined inactivation activates the p53 pathway, leading to tissue damage and diabetes, but p53 inactivation prevents these effects and unmasks tumor development.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Tissue homeostasis relies on controlled cell proliferation, differentiation, and apoptosis.
  • E2F1 and E2F2 transcription factors are crucial for maintaining tissue homeostasis, particularly in the pancreas.

Purpose of the Study:

  • To elucidate the mechanism by which E2F1 and E2F2 regulate tissue homeostasis.
  • To investigate the role of the p53 pathway in the pancreatic phenotype of E2F1/E2F2-deficient mice.

Main Methods:

  • Analysis of E2F1/E2F2 double-knockout (DKO) mice and triple-knockout mice (lacking E2F1, E2F2, and p53).
  • Assessment of pancreatic atrophy, apoptosis, DNA replication, DNA damage response, and p53 pathway activation.
  • In vivo suppression of DNA replication using aphidicolin.

Main Results:

  • Pancreas atrophy in DKO mice is linked to mitochondrial apoptosis and p53 activation, preceding diabetes onset.
  • E2F1/E2F2 deficiency causes unscheduled DNA replication and DNA damage response in pancreatic cells.
  • DNA replication stress directly activates the p53 pathway in DKO pancreas.
  • p53 inactivation prevents organ involution and diabetes in DKO mice.
  • p53 inactivation in E2F1/E2F2-depleted cells accelerates tumor development.

Conclusions:

  • E2F1 and E2F2 act as suppressors of replicative stress in differentiating cells.
  • A critical E2F-p53 regulatory axis maintains tissue homeostasis and prevents tumorigenesis.
  • Targeting E2F offers potential strategies for cancer therapy.