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Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
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Functional cooperation between HP1 and DNMT1 mediates gene silencing.

Andrea Smallwood1, Pierre-Olivier Estève, Sriharsa Pradhan

  • 1Department of Biological Chemistry, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, California 90095, USA.

Genes & Development
|May 2, 2007
PubMed
Summary

Mammalian euchromatic gene silencing involves histone and DNA methyltransferases. HP1 proteins mediate communication between these enzymes, leading to gene repression.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Gene Regulation

Background:

  • Euchromatic gene silencing in mammals relies on histone and DNA methyltransferases.
  • The precise mechanisms of cooperation between these enzymes remain largely unelucidated.

Purpose of the Study:

  • To investigate the role of HP1 family members in mediating communication between histone and DNA methyltransferases during gene silencing.
  • To elucidate the molecular interactions and in vivo relevance of HP1 in this process.

Main Methods:

  • In vitro binding assays using histone 3 Lys 9 methylation by G9a as a platform for HP1.
  • Assessing DNA methylation changes upon DNMT1 interaction with HP1 on DNA and chromatin templates.
  • In vivo studies using reporter constructs and gene silencing analysis in DNMT1 wild-type and null cells.

Main Results:

  • Histone 3 Lys 9 methylation by G9a creates a binding site for HP1 proteins (alpha, beta, gamma).
  • DNMT1 physically interacts with HP1, enhancing DNA methylation in vitro.
  • This interaction is functionally relevant in vivo, as GAL4-HP1 binding induces repression and DNA methylation in a DNMT1-dependent manner.
  • Survivin gene silencing correlates with G9a and HP1 recruitment in a DNMT1-dependent manner.

Conclusions:

  • HP1 proteins act as crucial mediators, bridging histone and DNA methyltransferases.
  • Direct interactions between HP1 and DNMT1 are essential for the silencing of euchromatic genes.