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Updated: Aug 8, 2026

Assessment of Selective mRNA Translation in Mammalian Cells by Polysome Profiling
10:00

Assessment of Selective mRNA Translation in Mammalian Cells by Polysome Profiling

Published on: October 28, 2014

[The negative regulation of ribosome biogenesis: a new Arf-dependent pathway controlling cell proliferation?]

Olivier Ayrault1, Laetitia Andrique, Christian-Jacques Larsen

  • 1EA 3805, Equipe d'Oncologie Moléculaire, Pôle Biologie-Santé, 40, avenue du recteur Pineau, 86022 Poitiers Cedex, France.

Medecine Sciences : M/S
|May 12, 2006
PubMed

Insights

The nucleolar Arf protein regulates cell cycle via a p53-independent pathway by controlling ribosome biogenesis. Arf inhibits rRNA transcription and maturation, leading to cell cycle arrest.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Context:

  • The nucleolar Arf protein was initially recognized for its role in cell cycle regulation through the Arf-mdm2-p53 pathway.
  • Since 2000, evidence suggests Arf also inhibits cell proliferation independently of p53, indicating an alternative regulatory mechanism.

Purpose:

  • To elucidate the p53-independent mechanisms by which Arf regulates cell proliferation.
  • To identify novel Arf-interacting partners involved in alternative regulatory pathways.

Summary:

  • Recent findings demonstrate that Arf binds to the rDNA promoter, inhibiting the transcription of the 47S rRNA precursor.
  • Furthermore, Arf interacts with nucleophosmin/B23 to negatively regulate rRNA maturation.
  • These actions suggest Arf controls cell cycle progression by regulating ribosome biogenesis, ultimately causing cell cycle arrest.

Impact:

  • This research reveals a novel p53-independent function of Arf in cell cycle control.
  • Understanding Arf's role in ribosome biogenesis provides new insights into its tumor suppressor activity.
  • Identifies potential new targets for cancer therapies aimed at regulating cell proliferation.

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