Abstract
To further our understanding of initiation and imprinting of X–chromosome inactivation, we have examined methylation of specific CpG sites of X–linked Pgk–1 and G6pd genes throughout female mouse development. Methylation occurs around the time of inactivation and earlier for Pgk–1, which is closer to the X–inactivation centre. In female primordial germ cells, the inactive X chromosome escapes methylation; this may underly the reversibility of inactivation at meiosis. Similarly, the genes are unmethylated on the inactive X chromosome in sperm; hence, the imprint specifying preferential X–inactivation in extra–embryonic tissues must reside elsewhere.
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Grant, M., Zuccotti, M. & Monk, M. Methylation of CpG sites of two X–linked genes coincides with X–inactivation in the female mouse embryo but not in the germ line. Nat Genet 2, 161–166 (1992). https://doi.org/10.1038/ng1092-161
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DOI: https://doi.org/10.1038/ng1092-161
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