Mutation in fission yeast phosphatidylinositol 4-kinase Pik1 is synthetically lethal with defect in telomere protection protein Pot1.

Mutation in fission yeast phosphatidylinositol 4-kinase Pik1 is synthetically lethal with defect in telomere protection protein Pot1.
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裂殖酵母磷脂酰肌醇 4-激酶 Pik1 的突变具有综合致死性,端粒保护蛋白 Pot1 存在缺陷。

DOI:
10.1016/j.bbrc.2018.02.001
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发表时间:
2018
影响因子:
3.1
通讯作者:
M. Ueno
M. Ueno
中科院分区:
生物学4区
文献类型:
--
作者:
Asami Sugihara;L. C. Nguyen;Hossain Mohammad Shamim;Tetsushi Iida;Mai Nakase;K. Takegawa;M. Senda;Shohei Jida;M. Ueno

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裂殖酵母 Pik1p 是与高尔基复合体相关的三种磷脂酰肌醇 4-激酶之一,但其功能尚不完全清楚。 pot1+ 的缺失会导致端粒降解和染色体环化。我们搜索了pot1Δ 成为综合致死基因的基因。我们获得了一个新颖的pik1突变体pik1-1,它与pot1Δ具有综合致死性。我们发现高尔基体中的磷酸肌醇4-磷酸在pik1-1中被还原。为了研究pot1Δ pik1-1双突变体的致死机制,我们构建了nmt-pot1-aid pik1-1菌株,其中Pot1功能因药物而降低,导致端粒丢失和染色体环化,并且发现pik1-1突变并不影响端粒切除和染色体环化。因此,我们的结果表明pik1+是维持环状染色体所必需的。
Fission yeast Pik1p is one of three phosphatidylinositol 4-kinases associated with the Golgi complex, but its function is not fully understood. Deletion ofpot1+causes telomere degradation and chromosome circularization. We searched for the gene which becomes synthetically lethal withpot1Δ. We obtained a novelpik1mutant,pik1-1, which is synthetically lethal withpot1Δ. We found phosphoinositol 4-phosphate in the Golgi was reduced inpik1-1. To investigate the mechanism of the lethality of thepot1Δ pik1-1double mutant, we constructed thenmt-pot1-aid pik1-1strain, where Pot1 function becomes low by drugs, which leads to telomere loss and chromosome circularization, and foundpik1-1mutation does not affect telomere resection and chromosome circularization. Thus, our results suggest thatpik1+is required for the maintenance of circular chromosomes.
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发表时间: 2005-02-01
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