Abstract
Genes on the inactive X chromosome (Xi) of female mammals are repressed in a remarkably stable manner and reactivation of transcription is generally not observed unless the cell is reprogrammed to an early embryonic type. In this issue of The EMBO Journal , Pasque et al (2011) use a reprogramming system in frog oocytes to study the stability of Xi chromatin in cells of different developmental stages and identify the histone variant macroH2A as a factor preventing transcriptional activation.
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