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Related Experiment Videos

Polycomb group-dependent Cyclin A repression in Drosophila.

Anne-Marie Martinez1, Sophie Colomb, Jérôme Déjardin

  • 1Institute of Human Genetics, Centre National de la Recherche Scientifique, 34396 Montpellier Cedex 5, France.

Genes & Development
|February 17, 2006
PubMed
Summary

Polycomb group (PcG) proteins regulate cell cycle control by directly binding to the Cyclin A (CycA) gene. This study identifies a specific DNA region (PRE) critical for this PcG-mediated regulation in Drosophila.

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Cell Cycle Regulation

Background:

  • Polycomb group (PcG) and trithorax group (trxG) proteins are key epigenetic regulators maintaining gene expression states.
  • While PcG proteins are known for homeotic gene regulation, their role in cellular proliferation is less understood.
  • In Drosophila, PcG proteins associate with specific DNA sequences called PcG response elements (PREs).

Purpose of the Study:

  • To investigate whether Drosophila cell cycle genes are directly regulated by PcG proteins via PREs.
  • To identify and characterize a PRE regulating Cyclin A (CycA) expression.
  • To link PcG proteins to cell cycle control mechanisms in vivo.

Main Methods:

  • Isolation and characterization of a PRE regulating Cyclin A expression.

Related Experiment Videos

  • Chromatin immunoprecipitation (ChIP) assays to identify DNA-binding proteins (Polycomb (PC), Polyhomeotic (PH), GAGA factor (GAF)).
  • Transgenic fly assays using a mini-white reporter gene to assess PcG/trxG-dependent variegation.
  • Fluorescence in situ hybridization (FISH) combined with PC immunostaining in embryonic cells.
  • Analysis of CycA expression levels in response to mutations in Pc gene or altered Pc/ph expression.

    • Main Results:

    • A PRE regulating Cyclin A (CycA) expression was identified.
    • This PRE is bound by PcG proteins (PC, PH) and the trxG protein GAGA factor (GAF).
    • The identified PRE mediates PcG- and trxG-dependent variegation of a reporter gene.
    • The endogenous CycA gene colocalizes with PC at PcG bodies in embryonic cells.
    • Loss of Pc function leads to CycA up-regulation, while Pc and ph overexpression cause CycA down-regulation in embryos.

    Conclusions:

    • Cyclin A (CycA) is directly regulated by Polycomb group (PcG) proteins through a specific PRE.
    • This finding establishes a direct link between PcG proteins and cell cycle control in Drosophila.
    • PcG proteins play a crucial role in regulating cell proliferation via direct gene targets like CycA.