Journal
JOURNAL OF CELL SCIENCE
Volume 117, Issue 2, Pages 189-198Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.00851
Keywords
histone macroH2A1.2; HP1 beta; XY-body; asynapsed chromosome axes
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Histone macroH2A1.2 and the murine heterochromatin protein 1, HP1beta, have both been implicated in meiotic sex chromosome inactivation (MSCI) and the formation of the XY-body in male meiosis. In order to get a closer insight into the function of histone macroH2A1.2 we have investigated the localisation of macroH2A1.2 in surface spread spermatocytes from normal male mice and in oocytes of XX and XYTdym1 mice. Oocytes of XYTdym1 mice have no XY-body or MSCI despite having an XY chromosome constitution, so the presence or absence of 'XY-body' proteins in association with the X and/or Y chromosome of these oocytes enables some discrimination between potential functions of XY-body located proteins. We demonstrate here that macroH2A1.2 localises to the X and Y chromatin of spermatocytes as they condense to form the XY-body but is not associated with the X and Y chromatin of XYTdym1 early pachytene oocytes. MacroH2A1.2 and HP1beta co-localise to autosomal pericentromeric heterochromatin in spermatocytes. However, the two proteins show temporally and spatially distinct patterns of association to X and Y chromatin.
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