Abstract
During mammalian development, one of the two X chromosomes in female embryos is randomly inactivated in the somatic cell in order to achieve gene dosage compensation. But is X inactivation established simultaneously or is it accomplished over time in a lineage–dependent fashion? We have examined this question in mouse embryos carrying an X–linked lacZ transgene. This transgene is subject to inactivation and the loss of β–galactosidase activity provides a direct indication of X inactivation in individual cells. We find that X inactivation proceeds with different schedules in different somatic tissues, and the notochord, the heart, cranial mesoderm and the hindgut are among the last tissues to undergo X inactivation.
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Tan, SS., Williams, E. & Tam, P. X-chromosome inactivation occurs at different times in different tissues of the post-implantation mouse embryo. Nat Genet 3, 170–174 (1993). https://doi.org/10.1038/ng0293-170
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DOI: https://doi.org/10.1038/ng0293-170
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