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通过交换端粒盖将端粒DNA与核膜连接起来

Hiroki Shibuya¹, Abrahan Hernández-Hernández², Akihiro Morimoto¹

¹Laboratory of Chromosome Dynamics, Institute of Molecular and Cellular Biosciences, University of Tokyo, 1-1-1Yayoi, Tokyo 113-0032, Japan.

|November 10, 2015

概括

半转化涉及端粒附着到内核膜 (INM) 进行染色体运动. 一个新的复合体,TERB1/2-MAJIN,通过小鼠生殖细胞的等级阶段来调解这个过程.

科学领域:

细胞生物学
遗传学
分子生物学

背景情况:

端粒对于染色体的稳定性和功能至关重要.
在半转化过程中,端粒附着在内核膜 (INM) 上,以促进染色体的移动,同质配对和重组.
介质端粒附着和功能背后的精确分子机制仍然不完全理解.

研究的目的:

阐明端粒的结构适应性及其介质功能.
为了确定参与化过程中端粒与INM连接的蛋白质复合体.
了解哺乳动物中端粒-INM相互作用的调节和动态.

主要方法:

在小鼠生殖细胞中识别和描述一种新型介质端粒复合体 (TERB1/2-MAJIN).
介质前期中端粒复合物的组合和成熟的分析.
研究CDK依赖酸化和MAJIN在调节端粒连接中的DNA结合活性.
探索端粒附着和染色体运动之间的相互作用.

主要成果:

一个多子单元复合体,TERB1/2-MAJIN,被确定并被证明可以从shelterin复合体中接管端粒DNA.
TERB1/2-MAJIN最初通过其跨膜子单元MAJIN在INM上组装.
端粒附着涉及一个层次的"端粒盖交换"过程,形成一个与shelterin结合的过渡性化学复合物,该复合物成熟为DNA结合的TERB1/2-MAJIN.
CDK依赖的酸化和MAJIN的DNA结合活性调节了这种交换.
在端粒附着和染色体运动之间发现了正反循环.

结论:

这项研究揭示了TERB1/2-MAJIN复合体是哺乳动物中变特异性端粒功能的关键媒介.
层次的"端粒盖交换"是一种建立直接端粒-INM链接的新机制.
这一过程受到严格的监管,确保适当的染色体动力学,这对于生殖成功至关重要.
将端粒连接到染色体运动的调节网络突出显示了介质过程的复杂控制.

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