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
中科院分区:
文献类型:
--
作者:
Fu XH;Duan YM;Liu YT;Cai C;Meng FL;Zhou JQ
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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