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- W2080691805 abstract "In mammals, silencing of one of the two X chromosomes in female cells compensates for the different number of X chromosomes between the sexes. The noncoding Xist RNA initiates X chromosome inactivation. Xist spreads from its transcription site over the X chromosome territory and triggers the formation of a repressive chromatin domain. To understand localization of Xist over one X chromosome we aimed to develop a system for investigating Xist in living cells. Here we report successful visualization of transgenically expressed MS2‑tagged Xist in mouse embryonic stem cells. Imaging of Xist during an entire cell cycle shows that Xist spreads from a single point to a steady state when the chromosome is covered with a constant amount of Xist. Photobleaching experiments of the established Xist cluster indicate that chromosome‑bound Xist is dynamic and turns over on the fully Xist covered chromosome. It appears that in interphase the loss of bound Xist and newly produced Xist are in equilibrium. We also show that the turnover of bound Xist requires transcription, and Xist binding becomes stable when transcription is inhibited. Our data reveal a strategy for visualizing Xist and indicate that spreading over the chromosome might involve dynamic binding and displacement." @default.
- W2080691805 created "2016-06-24" @default.
- W2080691805 creator A5010867472 @default.
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- W2080691805 date "2011-07-15" @default.
- W2080691805 modified "2023-10-13" @default.
- W2080691805 title "A system for imaging the regulatory noncoding <i>Xist</i> RNA in living mouse embryonic stem cells" @default.
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- W2080691805 doi "https://doi.org/10.1091/mbc.e11-02-0146" @default.
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