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Related Experiment Videos

Mammalian X chromosome inactivation

R Jaenisch1, C Beard, J Lee

  • 1Whitehead Institute for Biomedical Research, Department of Biology, Massachusetts Institute of Technology, Cambridge 02142, USA.

Novartis Foundation Symposium
|May 27, 1998
PubMed
Summary

X chromosome inactivation requires the Xist gene, encoding untranslated RNA, which is essential for initiating and propagating inactivation. Xist RNA stabilization, not promoter regulation, drives this crucial process.

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Area of Science:

  • Mammalian genetics
  • Epigenetics
  • Developmental biology

Background:

  • X chromosome inactivation (XCI) is a key process in mammalian females to equalize gene dosage between sexes.
  • The Xist gene, located at the X inactivation centre (Xic), plays a critical role in initiating and maintaining XCI.
  • Understanding the regulatory mechanisms of Xist is crucial for comprehending XCI.

Purpose of the Study:

  • To investigate the necessity of Xist RNA for XCI initiation and propagation.
  • To determine the minimal DNA fragment sufficient to confer XCI activity.
  • To elucidate the regulatory mechanism controlling Xist expression during XCI.

Main Methods:

  • Gene targeting to truncate Xist RNA.
  • Yeast artificial chromosome (YAC) transgenesis to deliver Xist and flanking regions.

Related Experiment Videos

  • Analysis of XCI initiation, propagation, and maintenance in engineered models.

    • Main Results:

    • Truncation of Xist RNA is lethal and prevents X chromosome inactivation, confirming Xist RNA's essential role.
    • A 450 kb DNA fragment containing Xist is sufficient to act as an inactivation centre, mediating initiation, propagation, and maintenance.
    • X inactivation is regulated by post-translational stabilization of Xist RNA, not by Xist promoter activity.

    Conclusions:

    • Xist RNA is indispensable for the initiation, propagation, and maintenance of X chromosome inactivation in mammals.
    • The Xist gene and its regulatory elements within a defined region are sufficient to drive the entire XCI process.
    • X inactivation is primarily controlled by the post-transcriptional stabilization of Xist RNA, highlighting a post-translational regulatory mechanism.