X chromosome inactivation: heterogeneity of heterochromatin
2008
The silent X chromosome in mammalian females is a classic example of facultative heterochromatin, the term highlighting the compacted and inactive nature of the chromosome. However, it is now clear that the heterochromatin of the inactive X is not homogeneous — as indeed, not all genes on the inactive X are silenced. We summarize known features and events of X inactivation in different mouse and human model systems, and highlight the heterogeneity of chromatin along the inactive X. Characterizing this heterogeneity is likely to provide insight into the cis-acting sequences involved in X chromosome inactivation.
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