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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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A conserved switch to less catalytically active Polycomb repressive complexes in non-dividing cells.

Rachel McCole1, James Nolan2, David M Reck1

  • 1Smurfit Institute of Genetics, Trinity College Dublin, Dublin 2, Ireland.

Cell Reports
|January 12, 2025
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Quiescent cells utilize less active Polycomb Repressive Complex 2 (PRC2) and are resistant to PRC2 inhibitors. Targeting EZH1-PRC2 in these cells displaces canonical PRC1 (cPRC1) but not H3K27me3 marks.

Keywords:
CBX7CP: Molecular biologyEEDEZH1EZH2H3K27me3PRC1PRC2PROTACPolycombcellular quiescence

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Area of Science:

  • Epigenetics and gene regulation
  • Cellular biology
  • Molecular mechanisms of development

Background:

  • Polycomb repressive complex 2 (PRC2) is essential for maintaining cellular identity.
  • PRC2 deposits H3K27me3, recruiting canonical PRC1 (cPRC1) for gene repression.
  • The role of PRC2 and PRC1 in quiescent cells remains incompletely understood.

Purpose of the Study:

  • To investigate the composition and function of Polycomb complexes in quiescent cells.
  • To assess the efficacy of PRC2 inhibitors and PROTAC-mediated degradation in quiescent cells.
  • To understand the implications for cancer therapy.

Main Methods:

  • Analysis of Polycomb complexes in quiescent cells.
  • Treatment with PRC2 inhibitors.
  • PROTAC-mediated degradation of EZH1-PRC2.
  • Assessment of H3K27me3 levels and cPRC1 occupancy.

Main Results:

  • EZH1-PRC2 and cPRC1 are the predominant Polycomb complexes on target genes in quiescent cells.
  • Quiescent cells exhibit resistance to PRC2 inhibitors.
  • PROTAC-mediated degradation of EZH1-PRC2 in quiescent cells partially displaces cPRC1 without reducing H3K27me3.
  • Identified a conserved switch to less catalytically active Polycomb complexes in non-dividing cells.

Conclusions:

  • Non-dividing cells employ distinct Polycomb complex compositions and functionalities.
  • PRC2 inhibitors may be less effective in cancers with substantial quiescent cell populations.
  • Further research is needed to explore therapeutic strategies targeting Polycomb complexes in quiescent cancer cells.