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FOXO-binding partners: it takes two to tango

K E van der Vos1, P J Coffer

  • 1Molecular Immunology Lab, Department of Immunology, Wilhelmina Children's Hospital, University Medical Center, Utrecht, The Netherlands.

Oncogene
|April 9, 2008
PubMed

Insights

FOXO transcription factors regulate cell functions like proliferation and metabolism. New research shows FOXOs also control gene expression through interactions with other transcription factors, expanding their regulatory roles.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • FOXO (forkhead box) transcription factors influence diverse cellular processes including proliferation, apoptosis, differentiation, and metabolism.
  • Distinct phenotypes of Foxo1, Foxo3, and Foxo4 null mutant mice suggest isoform-specific functions, though multiple FOXO isoforms are often co-expressed.
  • Recent findings indicate FOXO proteins can regulate transcription independently of direct DNA binding.

Purpose of the Study:

  • To review known FOXO-binding partners.
  • To examine the role of FOXO interactions with other transcription factors in regulating gene expression.
  • To explore how these interactions influence cell fate decisions.

Main Methods:

  • Literature review of studies on FOXO transcription factors and their binding partners.
  • Analysis of experimental evidence demonstrating FOXO-mediated transcriptional regulation through protein-protein interactions.
  • Synthesis of findings on the impact of FOXO interactions on cellular functions.

Main Results:

  • FOXO proteins associate with various unrelated transcription factors, modulating the activation or repression of diverse target genes.
  • These interactions significantly expand the regulatory capacity of FOXO proteins beyond direct DNA binding.
  • The specific complement of transcription factors in a cell type dictates the ultimate functional outcome of FOXO activity.

Conclusions:

  • FOXO transcription factor activity is modulated by interactions with a wide array of protein partners.
  • These interactions are critical for determining cell fate and orchestrating complex transcriptional programs.
  • Understanding FOXO-binding partners is key to deciphering their multifaceted roles in cellular regulation.

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