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Straight to the X: Modeling Human X Chromosome Inactivation in hESCs by FGF Signal Blockade

Emmanuel Cazottes1, Claire Rougeulle1

  • 1Université de Paris, Epigenetics and Cell Fate, CNRS, F-75006 Paris, France.

Cell Stem Cell
|September 5, 2020
PubMed

Insights

Researchers developed a model to study human X chromosome inactivation in naive human embryonic stem cells (hESCS). This model revealed that incomplete FGF-signaling blockade causes cellular heterogeneity and identified cells similar to pre-implantation epiblasts.

Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Genetics

Background:

  • X chromosome inactivation is crucial for dosage compensation in female mammals.
  • Understanding X chromosome inactivation in human embryonic stem cells (hESCS) is vital for developmental studies.
  • Cellular heterogeneity in hESCS can complicate research into early human development.

Purpose of the Study:

  • To establish a model for studying human X chromosome inactivation in naive hESCS.
  • To investigate the causes of cellular heterogeneity during X chromosome inactivation.
  • To identify and isolate specific cell populations resembling early embryonic stages.

Main Methods:

  • Monitoring X chromosome activity over time in hESCS.
  • Analyzing cellular heterogeneity within the hESC population.
  • Manipulating FGF-signaling pathways.
  • Cell sorting and characterization.

Main Results:

  • A model was developed to track X chromosome activity in hESCS.
  • Cellular heterogeneity was linked to incomplete blockade of FGF-signaling.
  • Cells resembling pre-implantation epiblasts were successfully isolated.

Conclusions:

  • The developed model facilitates the study of human X chromosome inactivation.
  • FGF-signaling plays a key role in regulating X chromosome activity and cellular homogeneity.
  • This research provides insights into early human epiblast development and cellular states.

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