Molecular coupling of Xist regulation and pluripotency - PubMed (original) (raw)

. 2008 Sep 19;321(5896):1693-5.

doi: 10.1126/science.1160952.

Affiliations

• PMID: 18802003
• DOI: 10.1126/science.1160952

Molecular coupling of Xist regulation and pluripotency

Pablo Navarro et al. Science. 2008.

Abstract

During mouse embryogenesis, reversion of imprinted X chromosome inactivation in the pluripotent inner cell mass of the female blastocyst is initiated by the repression of Xist from the paternal X chromosome. Here we report that key factors supporting pluripotency-Nanog, Oct3/4, and Sox2-bind within Xist intron 1 in undifferentiated embryonic stem (ES) cells. Whereas Nanog null ES cells display a reversible and moderate up-regulation of Xist in the absence of any apparent modification of Oct3/4 and Sox2 binding, the drastic release of all three factors from Xist intron 1 triggers rapid ectopic accumulation of Xist RNA. We conclude that the three main genetic factors underlying pluripotency cooperate to repress Xist and thus couple X inactivation reprogramming to the control of pluripotency during embryogenesis.

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