Tet enzymes are essential for early embryogenesis and completion of embryonic genome activation.

Tet enzymes are essential for early embryogenesis and completion of embryonic genome activation.
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Tet酶对于早期胚胎发生和胚胎基因组激活的完成至关重要。

DOI:
10.15252/embr.202153968
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发表时间:
2022-02-03
期刊:
影响因子:
7.7
通讯作者:
Wossidlo M
Wossidlo M
中科院分区:
生物学2区
文献类型:
--
作者:
Arand J;Chiang HR;Martin D;Snyder MP;Sage J;Reijo Pera RA;Wossidlo M

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哺乳动物的发育始于转录沉默,随后是数千个基因的广泛激活。DNA甲基化重编程是胚胎发生不可或缺的,并与泰特酶有关,但它们在早期发育中的功能还不清楚。在这里,我们使用吗啉代指导的敲除方法在小鼠卵母细胞中产生所有三种泰特酶的联合缺陷,并研究急性泰特酶缺陷对植入前发育的影响。Tet 1 -3缺陷胚胎停滞在2细胞期,最严重的表型与Tet 2相关。单个泰特酶在5-甲基胞嘧啶连续氧化为5-羧基胞嘧啶中显示非冗余作用。基因表达分析发现,完成胚胎基因组激活(EGA)以及转座因子和嵌合转录物的微调表达需要泰特酶。全基因组亚硫酸氢盐测序揭示了泰特缺陷型2细胞胚胎中整体DNA甲基化的微小变化,表明泰特酶的非催化功能在早期胚胎发生中的重要作用。我们的研究结果表明,泰特酶的时钟,调节哺乳动物胚胎EGA的时间和程度的关键组成部分。基于吗啉代的敲除方法揭示了泰特酶在小鼠植入前发育和胚胎基因组激活中的重要功能。
Mammalian development begins in transcriptional silence followed by a period of widespread activation of thousands of genes. DNA methylation reprogramming is integral to embryogenesis and linked to Tet enzymes, but their function in early development is not well understood. Here, we generate combined deficiencies of all three Tet enzymes in mouse oocytes using a morpholino‐guided knockdown approach and study the impact of acute Tet enzyme deficiencies on preimplantation development. Tet1–3 deficient embryos arrest at the 2‐cell stage with the most severe phenotype linked to Tet2. Individual Tet enzymes display non‐redundant roles in the consecutive oxidation of 5‐methylcytosine to 5‐carboxylcytosine. Gene expression analysis uncovers that Tet enzymes are required for completion of embryonic genome activation (EGA) and fine‐tuned expression of transposable elements and chimeric transcripts. Whole‐genome bisulfite sequencing reveals minor changes of global DNA methylation in Tet‐deficient 2‐cell embryos, suggesting an important role of non‐catalytic functions of Tet enzymes in early embryogenesis. Our results demonstrate that Tet enzymes are key components of the clock that regulates the timing and extent of EGA in mammalian embryos. A morpholino‐based knockdown approach reveals an essential function of Tet enzymes in mouse preimplantation development and embryonic genome activation.
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