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G1/S restriction point coordinates phasic gene expression and cell differentiation.

Brian DeVeale1,2, Leqian Liu3,4, Ryan Boileau1,2

  • 1The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Center for Reproductive Sciences, University of California San Francisco, San Francisco, CA, USA.

Nature Communications
|June 27, 2022
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Summary
This summary is machine-generated.

Embryonic stem cells (ESCs) control differentiation by activating the G1/S restriction point. This activation links cell cycle regulation to gene expression changes, driving cellular differentiation.

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Area of Science:

  • Developmental biology
  • Cell cycle regulation
  • Stem cell differentiation

Background:

  • Pluripotent embryonic stem cells (ESCs) exhibit a unique cell cycle with a suppressed G1/S restriction point.
  • Limited differential gene expression occurs across cell cycle phases in ESCs.

Purpose of the Study:

  • To investigate the relationship between G1/S restriction point activation, cell cycle-phasic gene expression, and cellular differentiation.
  • To understand the molecular mechanisms governing the transition from a pluripotent to a differentiated state.

Main Methods:

  • Analysis of gene expression patterns during mouse embryonic development (E7.5-E9.5).
  • Genetic manipulation of key cell cycle regulators, including miR-302 and P27.
  • Assessment of differentiation status in genetically modified ESCs and mouse embryos.

Main Results:

  • Phasic gene expression increases across lineages between embryonic days E7.5 and E9.5.
  • Modulation of miR-302 and P27 altered the timing of phasic gene expression.
  • Loss of miR-302-mediated suppression of p21/p27 accelerated ESC differentiation; Cyclin E mutation blocked differentiation.

Conclusions:

  • The emergence of the G1/S restriction point is causally linked to increased phasic gene expression.
  • This interplay is a critical driver for initiating cellular differentiation from ESCs.