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Related Experiment Videos

Histone acetylation and X inactivation

A M Keohane1, J S Lavender, L P O'Neill

  • 1Department of Anatomy, University of Birmingham Medical School, Edgbaston, U.K.

Developmental Genetics
|March 21, 1998
PubMed
Summary

Histone underacetylation is crucial for stabilizing the inactive X chromosome (Xi) in mammals. This finding, observed across diverse species, highlights its fundamental role in maintaining gene silencing during X inactivation.

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Area of Science:

  • Genetics
  • Epigenetics
  • Mammalian Development

Background:

  • X-chromosome inactivation (XCI) equalizes X-linked gene expression between sexes.
  • The inactive X chromosome (Xi) exhibits distinct epigenetic marks, including histone underacetylation.
  • The precise role of histone underacetylation in XCI initiation versus stabilization remains unclear.

Purpose of the Study:

  • To investigate the fundamental role of histone underacetylation in X-chromosome inactivation.
  • To determine if histone underacetylation is integral to the silencing process or a consequence of other Xi properties.
  • To elucidate the timing of histone deacetylation within the X inactivation pathway.

Main Methods:

  • Comparative analysis of Xi histone modifications in marsupial mammals.

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  • Experimental manipulation of histone deacetylation in mouse embryonic stem cells.
  • Assessment of histone H4 acetylation status on the inactive X chromosome.

    • Main Results:

    • Marsupial Xi exhibits histone H4 underacetylation, similar to eutherian Xi, despite evolutionary divergence.
    • Histone H4 deacetylation precedes complete X inactivation in mouse embryonic stem cells.
    • Evidence suggests histone underacetylation is critical for stabilizing the inactive X state.

    Conclusions:

    • Histone underacetylation is a conserved and fundamental feature of the inactive X chromosome across mammals.
    • Histone deacetylation plays a role in the stabilization, not initiation, of X-chromosome inactivation.
    • These findings underscore the importance of epigenetic modifications in maintaining long-term gene silencing.