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Cdx regulates gene expression through PRC2-mediated epigenetic mechanisms.

Tanya Foley1, David Lohnes1

  • 1Department of Cellular and Molecular Medicine, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, Canada, K1H 8M5.

Developmental Biology
|January 1, 2022
PubMed
Summary

Cdx genes regulate early embryonic development, impacting blood formation in the yolk sac and gene expression via epigenetic mechanisms. This study reveals new Cdx targets and their regulatory roles.

Keywords:
CdxEpigeneticsPRC2TranscriptionYolk sac

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Hematopoiesis

Background:

  • The extra-embryonic yolk sac is crucial for early embryonic development, supporting hematopoiesis and nutrient exchange.
  • Cdx genes are known to be involved in developmental processes, but their specific targets and mechanisms in the yolk sac are not fully understood.

Purpose of the Study:

  • To investigate Cdx-dependent gene expression changes in the yolk sac using RNA-sequencing.
  • To identify novel Cdx target genes and elucidate the molecular mechanisms regulating yolk sac development and hematopoiesis.

Main Methods:

  • RNA-sequencing (RNA-seq) was employed to analyze gene expression in the yolk sac of Cdx mutant mouse models.
  • Chromatin immunoprecipitation followed by sequencing (ChIP-seq) or similar methods were likely used to assess H3K27me3 deposition.

Main Results:

  • Loss of Cdx function affects genes involved in yolk sac hematopoiesis and identifies novel Cdx2 targets.
  • Cdx-dependent changes in Polycomb Repressive Complex 2 (PRC2) subunit expression and H3K27me3 modification were observed in the early embryo proper.
  • Epigenetic regulation by Cdx is crucial for maintaining gene expression programs in the extra-embryonic yolk sac.

Conclusions:

  • This study expands the known targets of Cdx genes in early development.
  • It provides evidence for Cdx-mediated epigenetic regulation, involving PRC2 and H3K27me3, essential for extra-embryonic development.