Telomere recombination preferentially occurs at short telomeres in telomerase-null type II survivors.

Telomere recombination preferentially occurs at short telomeres in telomerase-null type II survivors.
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端粒重组优先发生在端粒酶无效的II型幸存者中的短端粒处。

DOI:
10.1371/journal.pone.0090644
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Zhou JQ
Zhou JQ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Fu XH;Duan YM;Liu YT;Cai C;Meng FL;Zhou JQ

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在端粒酶阴性的酵母细胞中,Rad 52依赖性重组被激活以维持端粒。这种重组介导的端粒延长通常涉及两个独立的途径,I型和II型,并导致I型和II型幸存者的产生。重组介导的端粒延长是发生在较短的端粒上还是较长的端粒上仍然是一个谜。在这项研究中,我们利用从头端粒添加系统来检查端粒酶阴性细胞中的端粒重组事件。我们发现,重组优先发生在较短的端粒,而不是较长的前幸存者和建立II型幸存者。在II型存活者中,短的VII-L端粒可以侵入末端TG 1 -3序列或亚端粒Y′-X和Y′-Y′连接处的TG 1 -3序列的短片段,以启动重组。出乎意料的是,短VII-L端粒重组仍然发生在缺乏Rad 50或Rad 59的II型幸存者中,这是衰老端粒缺失细胞中II型幸存者生成所需的。我们的研究结果支持的概念,Rad 50和Rad 59是不是必不可少的维护II型幸存者一旦建立。
In telomerase negative yeast cells, Rad52-dependent recombination is activated to maintain telomeres. This recombination-mediated telomere elongation usually involves two independent pathways, type I and type II, and leads to generation of type I and type II survivors. It remains elusive whether the recombination-mediated telomere elongation prefers to take place on shorter or longer telomeres. In this study, we exploited the de novo telomere addition system to examine the telomere recombination event in telomerase negative cells. We show that recombination preferentially occurs on shorter rather than longer telomeres in both pre-survivors and established type II survivors. In type II survivors, the short VII–L telomeres could invade either terminal TG1–3 sequence or short tracts of TG1–3 sequence in subtelomeric Y′-X and Y′-Y′ junction to initiate recombination. Unexpectedly, short VII–L telomere recombination still takes place in type II survivors lacking either Rad50 or Rad59, which are required for type II survivor generation in senescing telomerase-null cells. Our results support the notion that Rad50 and Rad59 are not essential for the maintenance of type II survivors once established.
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