Abstract:In mammals, the X and Y chromosomes share only small regions of homology called pseudo-autosomal regions (PAR) where pairing and recombination in spermatocytes can occur. Consequently, the sex chromosomes remain largely unsynapsed during meiosis I and are sequestered in a nuclear compartment known as the XY body where they are transcriptionally silenced in a process called meiotic sex chromosome inactivation (MSCI). MSCI mirrors meiotic silencing of unpaired chromatin (MSUC), the sequestration and transcriptio… Show more
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