Related Experiment Video

Updated: May 3, 2026

Combined DNA-RNA Fluorescent In situ Hybridization FISH to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells
15:54

Combined DNA-RNA Fluorescent In situ Hybridization FISH to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells

Published on: June 14, 2014

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Getting off the ground state: X chromosome inactivation knocks down barriers to differentiation

Robert Morey1, Louise C Laurent1

  • 1Department of Reproductive Medicine, University of California, San Diego, Sanford Consortium for Regenerative Medicine, 2880 Torrey Pines Scenic Drive, La Jolla, CA 92037, USA.

Cell Stem Cell
|February 11, 2014
PubMed

Insights

Female mouse stem cells with two active X chromosomes stay pluripotent by blocking MAPK signaling. This ensures X chromosome dosage compensation aligns with developmental timing.

Area of Science:

  • Developmental Biology
  • Epigenetics
  • Stem Cell Biology

Background:

  • Female mouse embryonic stem cells (mESCs) possess two active X chromosomes.
  • X chromosome inactivation is a key process during differentiation.
  • The link between X chromosome status and pluripotency exit is not fully understood.

Purpose of the Study:

  • To investigate how two active X chromosomes influence mESC pluripotency.
  • To determine the role of MAPK signaling in this process.
  • To understand the synchronization of X chromosome dosage compensation and development.

Main Methods:

  • Utilized mESCs with two active X chromosomes.
  • Investigated the impact of active X chromosomes on MAPK signaling pathways.
  • Assessed the effects on pluripotency exit and differentiation.

Main Results:

  • The presence of two active X chromosomes in mESCs actively prevents exit from pluripotency.
  • This block is mediated by the inhibition of MAPK signaling.
  • Active X chromosomes ensure that X chromosome dosage compensation is synchronized with developmental progression.

Conclusions:

  • Two active X chromosomes maintain mESC pluripotency by suppressing MAPK signaling.
  • This mechanism ensures proper coordination between epigenetic regulation (X inactivation) and developmental timing.
  • Findings provide critical insights into the regulation of pluripotency and early development.

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