Dicer's Role in Xist Promoter Methylation in Embryonic Stem Cells
Author Information
Author(s): Tatyana B. Nesterova, Bilyana C. Popova, Bradley S. Cobb, Sara Norton, Claire E. Senner, Y. Amy Tang, Thomas Spruce, Tristan A. Rodriguez, Takashi Sado, Matthias Merkenschlager, Neil Brockdorff
Primary Institution: MRC Clinical Sciences Centre, Faculty of Medicine ICSTM, Hammersmith Hospital, London, UK
Hypothesis
How does Dicer influence Xist promoter methylation and X chromosome inactivation in embryonic stem cells?
Conclusion
Dicer does not play a critical role in Xist promoter methylation or X chromosome inactivation, as these processes can occur independently of the RNAi pathway.
Supporting Evidence
- Dicer-deficient embryonic stem cells showed hypomethylation of the Xist promoter.
- Xist expression patterns were normal in Dicer-deficient embryos.
- Sense and antisense transcription influence Xist promoter methylation.
- Reduced levels of de novo DNA methyltransferases were observed in Dicer-deficient cells.
- The RNAi pathway is not essential for X chromosome inactivation.
Takeaway
Dicer is not needed for the Xist gene to work properly in deciding which X chromosome gets turned off in female cells.
Methodology
The study used embryonic stem cells to analyze the effects of Dicer deletion on Xist promoter methylation and expression.
Limitations
The study primarily focuses on embryonic stem cells and may not fully represent other cell types or conditions.
Digital Object Identifier (DOI)
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