需要通过TET1进行代氧化来重新编程印记控制区域和鼠标精子低甲基化区域的模式

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Single Oocyte Bisulfite Mutagenesis

Published on: June 27, 2012

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Rexxi D Prasasya¹, Blake A Caldwell¹, Zhengfeng Liu¹

¹Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

Developmental cell

|April 3, 2024

概括

十-十一转位 (TET) 酶对于生殖系重编程中的基因组去甲基化至关重要. 这项研究揭示了TET1

科学领域:

表观遗传学和基因组学
哺乳动物发展哺乳动物发展
DNA 甲基化动力学

背景情况:

十-十一转位 (TET) 酶通过5 - 甲基细胞素 (5mC) 的代氧化来调解活性DNA脱甲基化.
在生殖线重编程和甲基组模式中,TET酶活性与其他功能的确切作用仍然不完全理解.
之前的研究在将TET酶活性与其氧化产物脱方面遇到了挑战.

研究的目的:

为了研究是否需要通过TET酶进行代的5mC氧化来进行哺乳动物生殖系重编程.
为了确定TET1是否具有超越其催化活性在调节精子甲基组中的功能.
阐明TET1介导的生殖系重编程与精子DNA甲基化模式的建立之间的联系.

主要方法:

产生表达催化不活性TET1 (Tet1-HxD) 的小鼠线和在5-基甲基细胞因子 (5hmC) 生产 (Tet1-V) 停滞的TET1的小鼠线.
对原始生殖细胞 (PGC) 和来自野生型,Tet1淘汰赛和催化突变小鼠的精子中的DNA甲基化模式的分析.
对变相关基因和印记控制区域的基因表达的评估.

主要成果:

1淘汰和催化突变的PGC在特定的印记控制区域和与中变相关的基因促进器中表现出DNA甲基化不完全的擦除.
TET1^V和TET1^HxD的表达在很大程度上挽救了在Tet1^-/-精子中观察到的高甲基化,这表明了TET1在氧化之外的重要性.
在Tet1突变精子中发现了更广泛的超甲基化区域,这些区域依赖于TET介导的氧化来进行适当的重编程.

结论:

通过TET酶对5mC的代氧化对于完整的生殖系重编程和DNA甲基化标记的擦除至关重要.
TET1在塑造精子甲基组方面发挥着重要作用,其功能超出了其催化氧化活性.
这项研究确定了TET1驱动的生殖系重编程与精子中DNA甲基化精确模式之间的直接联系.

关键词:

通过DNA甲基化.这是一种TET酶.这是表观遗传学.胚胎线重编程是什么意思印记是为了印记.原始生殖细胞的建立.重编程是重新编程.精子DNA甲基化机构精子DNA甲基化机构精子甲基组组的精子

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