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The Polycomb group protein EZH2 directly controls DNA methylation
Emmanuelle Viré1, Carmen Brenner, Rachel Deplus
1Free University of Brussels, Faculty of Medicine, Laboratory of Molecular Virology, 808 route de Lennik, 1070 Brussels, Belgium.
Nature
|December 17, 2005
Summary
Polycomb group (PcG) proteins and DNA methylation are key epigenetic silencing systems. This study reveals EZH2 protein links these pathways, recruiting DNA methyltransferases to target genes for heritable gene repression.
Area of Science:
- Epigenetics
- Molecular Biology
- Gene Regulation
Background:
- Epigenetic gene silencing is crucial for cell identity and function.
- Polycomb group (PcG) proteins and DNA methylation are the primary systems for heritable gene repression.
Purpose of the Study:
- To investigate the mechanistic link between PcG proteins and DNA methylation pathways.
- To determine the role of EZH2 in connecting these two epigenetic repression systems.
Main Methods:
- In vivo association studies of EZH2 with DNA methyltransferases (DNMTs).
- Chromatin immunoprecipitation assays to assess DNMT binding to EZH2-regulated genes.
- Bisulphite genomic sequencing to evaluate DNA methylation at target promoters.
Main Results:
- EZH2 interacts with DNMTs and is associated with DNMT activity.
- DNMT binding to EZH2-repressed genes is dependent on EZH2 presence.
- EZH2 is essential for DNA methylation of its target gene promoters.
Conclusions:
- EZH2 acts as a scaffold, recruiting DNMTs to specific gene loci.
- A direct mechanistic link between PcG protein-mediated and DNA methylation-mediated gene silencing is established.
- This finding uncovers a novel connection between two fundamental epigenetic regulatory pathways.
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