Establishing Chromatin Regulatory Landscape during Mouse Preimplantation Development.

Establishing Chromatin Regulatory Landscape during Mouse Preimplantation Development.
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DOI:
10.1016/j.cell.2016.05.050
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发表时间:
2016-06-02
期刊:
影响因子:
64.5
通讯作者:
Zhang Y
Zhang Y
中科院分区:
生物学1区
文献类型:
--
作者:
Lu F;Liu Y;Inoue A;Suzuki T;Zhao K;Zhang Y

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在着床前发育过程中,内细胞群细胞中的染色质调控景观是如何从不同包装的精子和卵子基因组中建立起来的尚不清楚。在这里,我们开发了一种低输入DNase- I测序(liDNase-seq)方法,使我们能够生成小鼠着床前胚胎从1细胞到桑葚胚期的DNase- I超敏位点(DHS)图谱。DHS景观逐渐建立,在8细胞阶段急剧增加。受精后,父本染色质可接近性迅速重编程到与母本染色质相似的水平,而印迹基因表现出等位基因可接近性偏差。我们证明转录因子Nfya有助于合子基因组激活和2细胞期DHS的形成,而Oct4有助于8细胞期DHS的获得。我们的研究揭示了早期发育过程中染色质的动态调控景观,并确定了对哺乳动物胚胎DHS建立重要的关键转录因子。
How the chromatin regulatory landscape in the inner cell mass cells is established from differentially packaged sperm and egg genomes during preimplantation development is unknown. Here we develop a low-input DNase I sequencing (liDNase-seq) method that allows us to generate maps of DNase I-hypersensitive site (DHS) of mouse preimplantation embryos from 1-cell to morula stage. The DHS landscape is progressively established with a drastic increase at the 8-cell stage. Paternal chromatin accessibility is quickly reprogrammed after fertilization to the level similar to maternal chromatin, while imprinted genes exhibit allelic accessibility bias. We demonstrate that transcription factor Nfya contributes to zygotic genome activation and DHS formation at the 2-cell stage and that Oct4 contributes to the DHSs gained at the 8-cell stage. Our study reveals the dynamic chromatin regulatory landscape during early development and identifies key transcription factors important for DHS establishment in mammalian embryos.
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