938 resultados para Serodiscordant couples
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Note de l'éditeur : This article may not exactly replicate the final version published in the APA journal. It is not the copy of record. / Cet article ne constitue pas la version officielle, et peut différer de la version publiée dans la revue.
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Centromeres form the site of chromosome attachment to microtubules during mitosis. Identity of these loci is maintained epigenetically by nucleosomes containing the histone H3 variant CENP-A. Propagation of CENP-A chromatin is uncoupled from DNA replication initiating only during mitotic exit. We now demonstrate that inhibition of Cdk1 and Cdk2 activities is sufficient to trigger CENP-A assembly throughout the cell cycle in a manner dependent on the canonical CENP-A assembly machinery. We further show that the key CENP-A assembly factor Mis18BP1(HsKNL2) is phosphorylated in a cell cycle-dependent manner that controls its centromere localization during mitotic exit. These results strongly support a model in which the CENP-A assembly machinery is poised for activation throughout the cell cycle but kept in an inactive noncentromeric state by Cdk activity during S, G2, and M phases. Alleviation of this inhibition in G1 phase ensures tight coupling between DNA replication, cell division, and subsequent centromere maturation.
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Note de l'éditeur : This article may not exactly replicate the final version published in the APA journal. It is not the copy of record. / Cet article ne constitue pas la version officielle, et peut différer de la version publiée dans la revue.
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Willem Pietersz. Buytewech; 1 ft. 10 11/64 in.x 2 ft. 3 3/4 in.; oil on canvas
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Mode of access: Internet.
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Katsushika Hokusai; 10 7/16 in.x 1 ft. 3 23/64 in.; woodcut on paper
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"(R-06-07)"--Colophon.
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Hieronymus Bosch; grisaille, oil on wood
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Hieronymus Bosch; grisaille, oil on wood
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Hieronymus Bosch; grisaille, oil on wood
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Hieronymus Bosch; grisaille, oil on wood
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Daybook, image #12