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The Polycomb Ezh2 methyltransferase regulates muscle gene expression and skeletal muscle differentiation

Open access
Caretti, Giuseppina, Di Padova, Monica, Micales, Bruce, Lyons, Gary E., Sartorelli, Vittorio·2004·Genes & Development

Abstract

The Ezh2 protein endows the Polycomb PRC2 and PRC3 complexes with histone lysine methyltransferase (HKMT) activity that is associated with transcriptional repression. We report that Ezh2 expression was developmentally regulated in the myotome compartment of mouse somites and that its down-regulation coincided with activation of muscle gene expression and differentiation of satellite-cell-derived myoblasts. Increased Ezh2 expression inhibited muscle differentiation, and this property was conferred by its SET domain, required for the HKMT activity. In undifferentiated myoblasts, endogenous Ezh2 was associated with the transcriptional regulator YY1. Both Ezh2 and YY1 were detected, with the deacetylase HDAC1, at genomic regions of silent muscle-specific genes. Their presence correlated with methylation of K27 of histone H3. YY1 was required for Ezh2 binding because RNA interference of YY1 abrogated chromatin recruitment of Ezh2 and prevented H3-K27 methylation. Upon gene activation, Ezh2, HDAC1, and YY1 dissociated from muscle loci, H3-K27 became hypomethylated and MyoD and SRF were recruited to the chromatin. These findings suggest the existence of a two-step activation mechanism whereby removal of H3-K27 methylation, conferred by an active Ezh2-containing protein complex, followed by recruitment of positive transcriptional regulators at discrete genomic loci are required to promote muscle gene expression and cell differentiation.

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Metadata

Authors
Caretti, G., Di Padova, M., Micales, B., Lyons, G. E., & Sartorelli, V.
Venue
Genes & Development
Published
2004-11-01
Volume
18
Issue
21
Pages
2627-2638
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2108136318
Cited by
600
References
8
Type
posted content
Language
en
Open access
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