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ASPP1 and ASPP2 are new transcriptional targets of E2F

V Fogal1, N N Kartasheva, G Trigiante

  • 1Ludwig Institute for Cancer Research, University College London, 91 Riding House Street, London W1W 7BS, UK.

Cell Death and Differentiation
|February 26, 2005
PubMed

Insights

Transcription factors E2F-1, E2F-2, and E2F-3 activate ASPP1 and ASPP2 genes, which are crucial for p53-mediated apoptosis. This discovery reveals a new pathway for E2F and p53 to induce programmed cell death.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The E2F family of transcription factors is essential for regulating genes involved in cell cycle control, DNA replication, and apoptosis.
  • ASPP1 and ASPP2 are known activators of p53-mediated apoptosis.

Purpose of the Study:

  • To investigate the regulatory relationship between E2F transcription factors and the ASPP1 and ASPP2 genes.
  • To elucidate the role of E2F in p53-mediated apoptosis through ASPP gene regulation.

Main Methods:

  • In vivo chromatin immunoprecipitation (ChIP) to assess E2F-1 binding to ASPP1 and ASPP2 promoters.
  • Reporter assays using isolated ASPP1 and ASPP2 promoters to study E2F activation.
  • Analysis of ASPP1 and ASPP2 mRNA and protein expression following E2F-1 overexpression or deregulation.

Main Results:

  • E2F-1 was shown to bind in vivo to the promoter regions of both ASPP1 and ASPP2 genes.
  • E2F-1, E2F-2, and E2F-3 were found to activate isolated ASPP1 and ASPP2 promoters.
  • Overexpression or deregulation of E2F-1 led to increased expression of ASPP1 and ASPP2 at both mRNA and protein levels.

Conclusions:

  • ASPP1 and ASPP2 are identified as direct transcriptional targets of E2F transcription factors.
  • This finding establishes a novel mechanism through which E2F collaborates with p53 to induce apoptosis.
  • The regulation of ASPP genes by E2F provides a deeper understanding of the intricate pathways controlling programmed cell death.

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