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Related Experiment Videos

Multiple response elements and differential p53 binding control Perp expression during apoptosis.

Elizabeth E Reczek1, Elsa R Flores, Alice S Tsay

  • 1Department of Biology and Center for Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Molecular Cancer Research : MCR
|January 7, 2004
PubMed
Summary
This summary is machine-generated.

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The p53 tumor suppressor gene regulates cell fate decisions. This study reveals how p53 selectively activates the pro-apoptotic Perp gene, offering insights into the apoptosis versus cell cycle arrest mechanism.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The p53 tumor suppressor gene is crucial for cellular stress response, mediating either cell cycle arrest or apoptosis.
  • While many p53 target genes are known, the precise mechanism governing the apoptosis versus arrest decision remains unclear.
  • The pro-apoptotic gene Perp is uniquely expressed at high levels in apoptotic cells, unlike many other p53 targets.

Purpose of the Study:

  • To elucidate the regulatory mechanism of the Perp gene by p53.
  • To understand how p53 distinguishes between apoptosis and cell cycle arrest pathways.
  • To investigate the role of specific p53 response elements in Perp gene regulation.

Main Methods:

  • Analysis of p53 regulation of the Perp gene promoter and first intron.

Related Experiment Videos

  • In vivo occupancy studies in mouse embryo fibroblasts undergoing apoptosis or cell cycle arrest.
  • Utilizing a p53 point mutant (p53V143A) to assess DNA binding specificity.

    • Main Results:

    • p53 regulates Perp expression through at least three response elements in its promoter and first intron.
    • These Perp response elements are occupied in vivo during apoptosis but not cell cycle arrest.
    • The apoptosis-deficient p53 mutant shows a selective deficit in binding to Perp elements compared to the p21 response element.
    • p53 demonstrates specificity in DNA binding to distinguish between Perp and p21.

    Conclusions:

    • p53 selectively binds to specific response elements to induce the pro-apoptotic Perp gene.
    • This selective binding provides mechanistic insight into how p53 favors apoptosis over cell cycle arrest.
    • The Perp gene and its regulation by p53 serve as a model for studying the p53-dependent apoptosis versus arrest decision.