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© Research
Publication : Genome biology

Xist localization and function: new insights from multiple levels

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Genome biology - 15 Aug 2015

Cerase A, Pintacuda G, Tattermusch A, Avner P

Link to Pubmed [PMID] – 26282267

Genome Biol. 2015;16:166

In female m ammals, one of the two X chromosomes in each cell is transcriptionally silenced in order to achieve dosage compensation between the genders in a process called X chromosome inactivation. The master regulator of this process is the long non-coding RNA Xist. During X-inactivation, Xist accumulates in cis on the future inactive X chromosome, triggering a cascade of events that provoke the stable silencing of the entire chromosome, with relatively few genes remaining active. How Xist spreads, what are its binding sites, how it recruits silencing factors and how it induces a specific topological and nuclear organization of the chromatin all remain largely unanswered questions. Recent studies have improved our understanding of Xist localization and the proteins with which it interacts, allowing a reappraisal of ideas about Xist function. We discuss recent advances in our knowledge of Xist-mediated silencing, focusing on Xist spreading, the nuclear organization of the inactive X chromosome, recruitment of the polycomb complex and the role of the nuclear matrix in the process of X chromosome inactivation.

http://www.ncbi.nlm.nih.gov/pubmed/26282267