Zygotic genome activation triggers the DNA replication checkpoint at the midblastula transition.

Zygotic genome activation triggers the DNA replication checkpoint at the midblastula transition.
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DOI:
10.1016/j.cell.2015.01.050
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发表时间:
2015-03-12
期刊:
影响因子:
64.5
通讯作者:
Wieschaus EF
Wieschaus EF
中科院分区:
生物学1区
文献类型:
--
作者:
Blythe SA;Wieschaus EF

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一个保守的特征,中囊胚转换(MBT)是一个功能性的DNA复制检查点,以协调细胞周期重塑和合子基因组激活(ZGA)的要求。我们已经调查了在果蝇胚胎发生过程中触发这个检查点的原因。我们发现检查点的大小与转录参与DNA的数量成比例。在ZGA过程中以20分钟的间隔测量RNA聚合酶II(Pol II)结合揭示了检查点与Pol II的广泛从头募集相一致,Pol II在功能检查点之前并且不需要功能检查点。这种募集驱动在转录参与的基因座处的DNA复制减慢或停滞。在塞尔达突变体中减少Pol II招募既减少了复制停滞,又绕过了对功能检查点的要求。这表明了一种模型,其中检查点作为反馈机制发挥作用,以响应于新生ZGA重塑细胞周期。
A conserved feature of the midblastula transition (MBT) is a requirement for a functional DNA replication checkpoint to coordinate cell cycle remodeling and zygotic genome activation (ZGA). We have investigated what triggers this checkpoint during Drosophila embryogenesis. We find that the magnitude of the checkpoint scales with the quantity of transcriptionally engaged DNA. Measuring RNA Polymerase II (Pol II) binding at 20-minute intervals over the course of ZGA reveals that the checkpoint coincides with widespread de novo recruitment of Pol II that precedes and does not require a functional checkpoint. This recruitment drives slowing or stalling of DNA replication at transcriptionally engaged loci. Reducing Pol II recruitment in zelda mutants both reduces replication stalling and bypasses the requirement for a functional checkpoint. This suggests a model where the checkpoint functions as a feedback mechanism to remodel the cell cycle in response to nascent ZGA.
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