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Polycomb complexes redundantly maintain epidermal stem cell identity during development.

Idan Cohen1, Carmit Bar2, Hequn Liu3

  • 1The Shraga Segal Department of Microbiology, Immunology, and Genetics, Faculty of Health Science, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.

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|February 19, 2021
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Summary
This summary is machine-generated.

Polycomb repressive complex 1 (PRC1) and PRC2 offer a redundant safety net for cell identity. Co-eliminating both complexes severely impacts epidermal development, unlike removing just one.

Keywords:
H2AK119ubH3K27me3PRC1PRC2Polycombepidermisepigeneticsskinstem cell

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Chromatin Regulation

Background:

  • Polycomb repressive complex 1 (PRC1) and PRC2 are key epigenetic regulators of development.
  • These complexes cooperate to establish repressive chromatin domains marked by H2AK119ub and H3K27me3.
  • The distinct roles and physiological significance of PRC1 and PRC2 in gene repression remain under investigation.

Purpose of the Study:

  • To investigate the functional contribution and potential redundancy of PRC1 and PRC2 in epidermal development.
  • To understand how these complexes maintain cell lineage identity through gene repression.

Main Methods:

  • Utilized a murine epidermis model to study embryonic epidermal progenitors.
  • Performed co-ablation experiments of PRC1 and PRC2 in progenitor cells.
  • Analyzed gene expression profiles and epigenetic marks (H2AK119ub, H3K27me3).
  • Conducted ectopic expression studies of transcription factors in wild-type epidermal stem cells.

Main Results:

  • Co-ablation of PRC1 and PRC2 led to severe epidermal stratification defects, unlike single knockouts.
  • Loss of both complexes resulted in a loss of epidermal identity.
  • This identity loss was associated with derepression of non-lineage transcription factors.
  • Ectopic expression of repressed factors suppressed epidermal identity genes.

Conclusions:

  • PRC1 and PRC2 exhibit functional redundancy, acting as independent counterparts.
  • This redundancy provides a crucial safety net for preserving cell lineage identity.
  • The findings highlight the importance of both complexes in maintaining developmental integrity.