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Related Experiment Videos

X inactivation Xplained.

Anton Wutz1, Joost Gribnau

  • 1Research Institute of Molecular Pathology, Dr. Bohr-Gasse 7, 1030 Vienna, Austria. wutz@imp.univie.ac.at

Current Opinion in Genetics & Development
|September 18, 2007
PubMed
Summary
This summary is machine-generated.

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Random X chromosome inactivation in female mammals ensures dosage compensation. The X inactivation center (Xic) controls this process, with Xist RNA initiating chromosome-wide silencing.

Area of Science:

  • Genetics
  • Mammalian Development
  • Epigenetics

Background:

  • Dosage compensation in placental mammals is achieved by random inactivation of one female X chromosome.
  • The X inactivation center (Xic) is a key regulatory region controlling X chromosome inactivation.
  • Genomic sequencing reveals Xic's evolution from an ancestral vertebrate gene cluster and its rearrangements in marsupials.

Purpose of the Study:

  • To investigate the evolutionary history and regulatory mechanisms of the X inactivation center (Xic).
  • To elucidate the process by which one X chromosome is randomly chosen for inactivation.
  • To understand the role of Xist RNA in initiating chromosome-wide silencing.

Main Methods:

  • Comparative genomics to trace Xic evolution across mammalian lineages.

Related Experiment Videos

  • Analysis of Xic loci pairing and chromosome states prior to inactivation.
  • Investigating the function of noncoding Xist RNA in X chromosome silencing.

    • Main Results:

    • The Xic has evolved from an ancestral vertebrate gene cluster, with distinct rearrangements in marsupials.
    • Pairing of Xic loci and pre-inactivation chromosome states are implicated in the random choice mechanism.
    • Xist RNA, which evolved with the Xic, coats the inactive X chromosome to initiate silencing.

    Conclusions:

    • The Xic is a conserved regulatory hub essential for mammalian dosage compensation.
    • The mechanism of random X inactivation involves intricate interactions at the Xic and the action of Xist RNA.
    • Understanding Xic evolution provides insights into mammalian sex chromosome regulation.