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DNA repair pathway stimulated by the forkhead transcription factor FOXO3a through the Gadd45 protein

Hien Tran1, Anne Brunet, Jill M Grenier

  • 1Division of Neuroscience, Children's Hospital and Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA.

Science (New York, N.Y.)
|April 20, 2002
PubMed

Insights

Mammalian FOXO3a protein is crucial for cell cycle control and DNA repair. This finding suggests FOXO3a

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Genetics

Background:

  • The phosphoinositide 3-kinase/Akt signaling pathway regulates cell survival and proliferation by inhibiting FOXO transcription factors.
  • FOXO proteins are key regulators of cellular processes, including stress response and longevity.

Purpose of the Study:

  • To investigate the role of mammalian FOXO3a in cell cycle regulation and DNA repair.
  • To identify downstream targets of FOXO3a involved in the cellular stress response.

Main Methods:

  • Gene array analysis to identify FOXO3a-modulated genes.
  • Functional studies to assess FOXO3a's role in the G2-M cell cycle checkpoint and DNA repair.

Main Results:

  • Mammalian FOXO3a functions at the G2-M checkpoint, promoting DNA repair.
  • FOXO3a modulates the expression of genes involved in the cellular stress response.
  • Gadd45a is identified as a direct target of FOXO3a, mediating DNA repair.

Conclusions:

  • FOXO3a plays a critical role in cellular resistance to stress by inducing DNA repair.
  • These findings suggest a potential link between FOXO3a function and organismal lifespan.

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