The telomerase reverse transcriptase elongates reversed replication forks at telomeric repeats.

The telomerase reverse transcriptase elongates reversed replication forks at telomeric repeats.
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DOI:
10.1126/sciadv.adf2011
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发表时间:
2023-03-22
期刊:
影响因子:
13.6
通讯作者:
Doksani, Ylli
Doksani, Ylli
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Huda, Armela;Arakawa, Hiroshi;Mazzucco, Giulia;Galli, Martina;Petrocelli, Valentina;Casola, Stefano;Chen, Lu;Doksani, Ylli

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端粒酶逆转录酶延长端粒以防止复制性衰老。这个过程需要暴露3′-末端,这被认为是在复制完成时产生两个姐妹端粒时发生的。利用二维琼脂糖凝胶电泳(2D-gels)和电子显微镜,我们发现端粒重复是复制叉逆转的热点。分叉反转在复制完成之前产生3′端端粒末端。为了验证这些末端是否被端粒酶延长,我们探测从头端粒合成原位和复制中间体通过重组突变端粒酶,增加了一个变体端粒序列。我们在2D凝胶中发现了与端粒倒叉重叠的端粒重复序列,但与正常的倒叉、非端粒倒叉或3′端富含C的端粒倒叉没有重叠。我们的研究结果定义逆转端粒叉作为端粒酶复制过程中的底物。端粒重复序列复制过程中的分叉塌陷产生3 '-DNA末端,其被端粒酶延长。
The telomerase reverse transcriptase elongates telomeres to prevent replicative senescence. This process requires exposure of the 3′-end, which is thought to occur when two sister telomeres are generated at replication completion. Using two-dimensional agarose gel electrophoresis (2D-gels) and electron microscopy, we found that telomeric repeats are hotspots for replication fork reversal. Fork reversal generates 3′ telomeric ends before replication completion. To verify whether these ends are elongated by telomerase, we probed de novo telomeric synthesis in situ and at replication intermediates by reconstituting mutant telomerase that adds a variant telomere sequence. We found variant telomeric repeats overlapping with telomeric reversed forks in 2D-gels, but not with normal forks, nontelomeric reversed forks, or telomeric reversed forks with a C-rich 3′-end. Our results define reversed telomeric forks as a substrate of telomerase during replication. Fork collapse during replication of telomeric repeats generates 3'-DNA ends that are elongated by telomerase.
通过端粒酶稳定相反的复制叉驱动端粒灾难。
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