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Multitasking by Polycomb response elements.

Elizabeth S Jaensch1, Sharmistha Kundu1, Robert E Kingston1

  • 1Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts, 02114, USA.

Genes & Development
|July 19, 2017
PubMed
Summary
This summary is machine-generated.

Polycomb group (PcG) proteins silence master regulatory genes for cell lineage specification. These PcG targeting elements overlap with transcriptional enhancers, revealing a dual role in gene regulation.

Keywords:
Polycomb response elements (PREs)developmental enhancersembryonic developmentpleiohomeotic repressive complex (PhoRC)silencingspatio–temporal expressiontranscriptional repression

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Area of Science:

  • Developmental biology
  • Epigenetics
  • Gene regulation

Background:

  • Cell lineage specification requires precise control of master regulatory genes.
  • Stable silencing of alternative lineage genes is crucial for development.
  • Polycomb group (PcG) proteins mediate heritable gene silencing.

Purpose of the Study:

  • To investigate the targeting mechanisms of PcG proteins.
  • To understand how PcG complexes are recruited to specific loci.
  • To explore the relationship between PcG targeting elements and transcriptional enhancers.

Main Methods:

  • Analysis of DNA elements involved in PcG recruitment.
  • Investigating the function of these elements in different cell lineages.
  • Examining the overlap between PcG targeting sites and enhancers.

Main Results:

  • PcG targeting elements are located at loci requiring lineage-specific silencing.
  • These same DNA elements also function as transcriptional enhancers.
  • PcG targeting elements exhibit a dual role, mediating both repression and activation depending on the cellular context.

Conclusions:

  • PcG targeting elements possess a dual function, acting as both silencing elements and lineage-specific enhancers.
  • This overlap ensures appropriate gene expression during cell differentiation.
  • Understanding this mechanism provides insight into epigenetic regulation and cell fate determination.