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Related Experiment Video

Updated: May 31, 2026

Combined DNA-RNA Fluorescent In situ Hybridization (FISH) to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells

Combined DNA-RNA Fluorescent In situ Hybridization (FISH) to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells

Published on: June 14, 2014

A YY1 bridge for X inactivation.

Joanne L Thorvaldsen¹, Jamie R Weaver, Marisa S Bartolomei

¹Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, 415 Curie Boulevard, Philadelphia, PA 19104, USA.

|July 7, 2011

Summary

Xist RNA inactivates the X chromosome by binding to it. The protein YY1 anchors Xist RNA to the inactive X chromosome (Xi) via DNA binding, facilitating X chromosome inactivation.

Area of Science:

Genetics
Molecular Biology
Epigenetics

Background:

Xist RNA is essential for X chromosome inactivation in mammals.
The precise mechanism by which Xist RNA associates with the inactive X chromosome (Xi) remains unclear.

Discussion:

This study reveals that the transcription factor YY1 acts as a crucial link between Xist RNA and the Xi.
YY1 binds to both Xist RNA and DNA, suggesting a model where YY1 anchors Xist to the Xi.

Key Insights:

YY1 bridges Xist RNA and the inactive X chromosome through direct binding interactions.
This interaction is proposed as a key mechanism for establishing and maintaining X chromosome inactivation.

Outlook:

Further research can explore the role of YY1 in other RNA-guided epigenetic processes.

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Last Updated: May 31, 2026

Combined DNA-RNA Fluorescent In situ Hybridization (FISH) to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells

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Investigating the dynamics of YY1-Xist-DNA complex formation will elucidate the temporal regulation of X chromosome inactivation.