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In female mammals, each cell silences one X chromosome by converting it into transcriptionally inert heterochromatin. The inactivation is concomitant with epigenetic changes including methylation of specific histone residues and incorporation of macroH2A. Such epigenetic changes may exert influence on the positioning of the inactive X chromosome (Xi) within the nucleus beyond the level of chromatin...
Histone methylation is one epigenetic modification of an inactive X chromosome (Xi). Histone H3 lysine 9 dimethylation (H3K9me) and histone H3 lysine 27 trimethylation (H3K27me) are both associated with the chromatin of gene-silenced regions in the X chromosome and with X inactivation. Studies have shown that H3K9me is supposedly an early mark on the X chromosome during inactivation. Here, we examined...
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