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• W2085669269 abstract "Two stages of genome activation have been identified in the mouse embryo. Specifically, minor transcriptional activation is evident at the one-cell stage and a second major episode of activation occurs at the two-cell stage. Nuclear translocation of RNA polymerase II and phosphorylation of the C-terminal domain (CTD) of the largest enzyme subunit are major determinants of embryonic genome activation. P-TEFb, the Pol II CTD kinase, regulates transcriptional elongation via phosphorylation of the serine 2 residues of the CTD.Here, we show that the CDK9 and cyclin T1 subunits of P-TEFb are present in mouse oocytes and preimplantation embryos. Both proteins translocate to pronuclei at the late one-cell stage and are predominantly localized in nuclei at the two-cell stage. We additionally examine the effects of the CDK9-specific inhibitor, flavopiridol, on mouse preimplantation development. Our data show that treatment with the drug results in mislocalization of CDK9, cyclin T1, and phosphorylated Pol II, as well as developmental arrest at the two-cell stage.A change in CDK9 localization from the cytoplasm to the pronucleus occurs at the time of minor embryonic genome activation, and CDK9 accumulation at the two-cell stage is evident, concomitant with major transcriptional activation of the embryonic genome. Moreover, CDK9 inhibition triggers a developmental block at the two-cell stage. Our findings clearly indicate that CDK9 is essential for embryonic genome activation in the mouse." @default.
• W2085669269 created "2016-06-24" @default.
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• W2085669269 date "2011-06-03" @default.
• W2085669269 modified "2023-09-27" @default.
• W2085669269 title "The CDK9/Cyclin T1 subunits of P-TEFb in mouse oocytes and preimplantation embryos: A possible role in embryonic genome activation" @default.
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• W2085669269 doi "https://doi.org/10.1186/1471-213x-11-33" @default.
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