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D4S234E, a novel p53-responsive gene, induces apoptosis in response to DNA damage

Takuya Kudoh1, Junko Kimura, Zheng-Guang Lu

  • 1Department of Molecular Genetics, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan.

Experimental Cell Research
|July 6, 2010
PubMed

Insights

A novel gene, D4S234E, responds to DNA damage by activating apoptosis. This p53-responsive gene accumulates in the endoplasmic reticulum, crucial for its cell death-inducing function in cancer therapy development.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Understanding apoptosis pathways is key for developing effective cancer therapies.
  • The transcription factor p53 is critical for apoptosis induction following genotoxic damage.
  • p53 regulates numerous genes involved in programmed cell death.

Purpose of the Study:

  • To identify novel p53-responsive genes involved in apoptosis.
  • To elucidate the role of D4S234E in p53-mediated apoptosis.
  • To investigate the cellular localization and function of D4S234E.

Main Methods:

  • Genome-wide gene expression profiling to identify p53-responsive genes.
  • Analysis of the D4S234E promoter to identify p53-binding sites.
  • RNA interference to inhibit D4S234E expression.
  • Subcellular localization studies and functional assays.

Main Results:

  • D4S234E was identified as a novel p53-responsive gene.
  • A specific p53-binding region in the D4S234E promoter was determined.
  • Inhibition of D4S234E suppressed apoptosis; ER targeting was essential for this function.
  • D4S234E depletion affected Bcl-2 and CHOP levels during genotoxic stress.

Conclusions:

  • D4S234E is a novel p53-regulated gene that induces apoptosis.
  • Endoplasmic reticulum accumulation of D4S234E is critical for its pro-apoptotic function.
  • D4S234E represents a potential therapeutic target for cancer treatment.

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