Methylation of CpG sites of two X-linked genes coincides with X-inactivation in the female mouse embryo but not in the germ line - PubMed (original) (raw)
Methylation of CpG sites of two X-linked genes coincides with X-inactivation in the female mouse embryo but not in the germ line
M Grant et al. Nat Genet. 1992 Oct.
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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