A genetic memory initiates the epigenetic loop necessary to preserve centromere position.

A genetic memory initiates the epigenetic loop necessary to preserve centromere position.
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遗传记忆启动了维护中心粒位置所需的表观遗传环。

DOI:
10.15252/embj.2020105505
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发表时间:
2020-10-15
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Fachinetti D
Fachinetti D
中科院分区:
其他
文献类型:
--
作者:
Hoffmann S;Izquierdo HM;Gamba R;Chardon F;Dumont M;Keizer V;Hervé S;McNulty SM;Sullivan BA;Manel N;Fachinetti D

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着丝粒是建立在重复DNA序列(CenDNA)和富含组蛋白H3变体CENP-A的特定染色质上的,CENP-A是识别着丝粒位置的表观遗传标记。在这里,我们通过开发一种快速去除和重新激活CENP-A(CENP-AOFF/ON)的系统来询问CenDNA在着丝粒特异性中的重要性。使用这个系统,我们定义的时间级联的事件需要保持着丝粒的位置。我们揭示了与CenDNA结合的CENP-B通过促进从头CENP-A沉积为人类着丝粒上的维持提供记忆。事实上,缺乏CENP-B有利于在选择性压力下形成新着丝粒。偶尔,CENP-B触发由CENP-C而不是CENP-A启动的着丝粒再激活,在异位和天然着丝粒处募集。这足以启动基于CENP‐A‐的表观遗传循环。最后,我们确定了一个群体的CENP-A-阴性,CENP-B/C-阳性的静息CD 4 + T细胞能够重新表达和重组CENP-A细胞周期进入,证明了遗传记忆的生理重要性。CENP-A的快速去除和再激活定义了维持着丝粒位置所需的事件的时间级联,DNA结合的CENP-B提供记忆并防止着丝粒位置的移动。
Centromeres are built on repetitive DNA sequences (CenDNA) and a specific chromatin enriched with the histone H3 variant CENP‐A, the epigenetic mark that identifies centromere position. Here, we interrogate the importance of CenDNA in centromere specification by developing a system to rapidly remove and reactivate CENP‐A (CENP‐AOFF/ON). Using this system, we define the temporal cascade of events necessary to maintain centromere position. We unveil that CENP‐B bound to CenDNA provides memory for maintenance on human centromeres by promoting de novo CENP‐A deposition. Indeed, lack of CENP‐B favors neocentromere formation under selective pressure. Occasionally, CENP‐B triggers centromere re‐activation initiated by CENP‐C, but not CENP‐A, recruitment at both ectopic and native centromeres. This is then sufficient to initiate the CENP‐A‐based epigenetic loop. Finally, we identify a population of CENP‐A‐negative, CENP‐B/C‐positive resting CD4+ T cells capable to re‐express and reassembles CENP‐A upon cell cycle entry, demonstrating the physiological importance of the genetic memory. Rapid removal and reactivation of CENP‐A defines the temporal cascade of events necessary to maintain centromere position, with DNA‐bound CENP‐B providing memory and preventing movement of centromere position.
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