The A-repeat links ASF/SF2-dependent Xist RNA processing with random choice during X inactivation
Morgan E Royce-Tolland1, Angela A Andersen, Hannah R Koyfman
1Department of Biochemistry and Biophysics, University of California, San Francisco, California, USA.
Nature Structural & Molecular Biology
|July 27, 2010
Summary
The Xist gene
Area of Science:
- Genetics
- Molecular Biology
- Epigenetics
Background:
- Mammalian females possess two X chromosomes, with one randomly inactivated per cell to ensure dosage compensation.
- The Xist gene produces a noncoding RNA essential for initiating X-chromosome inactivation (XCI).
Purpose of the Study:
- To investigate the role of the conserved A-repeat region within Xist RNA in regulating XCI.
- To determine if the A-repeat is crucial for proper Xist RNA processing and random XCI.
Main Methods:
- Analysis of Xist RNA accumulation and splicing.
- Assessment of X-chromosome inactivation patterns in cells with modified Xist A-repeat sequences.
Main Results:
- The A-repeat is essential for the accumulation of spliced Xist RNA.
- Deletion or mutation of the A-repeat disrupts the random nature of X-inactivation.
- Normal processing of Xist RNA, dependent on the A-repeat, is critical for stochastic XCI.
Conclusions:
- The Xist A-repeat plays a vital role in both Xist RNA processing and the stochastic choice of X chromosome inactivation.
- Modulation of Xist RNA processing by the A-repeat is a key mechanism in regulating random X-inactivation.
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