TAF-4 is required for the life extension of isp-1, clk-1 and tpk-1 Mit mutants.

TAF-4 is required for the life extension of isp-1, clk-1 and tpk-1 Mit mutants.
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DOI:
10.18632/aging.100604
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发表时间:
2013-10
期刊:
Aging
影响因子:
--
通讯作者:
Rea SL
Rea SL
中科院分区:
其他
文献类型:
--
作者:
Khan MH;Ligon M;Hussey LR;Hufnal B;Farber R 2nd;Munkácsy E;Rodriguez A;Dillow A;Kahlig E;Rea SL

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虽然在线虫中已经发现了许多延长生命的操作,但最神秘的是对氧化磷酸化的破坏。为了揭示这种表面上有害的操作如何延长寿命,我们试图确定响应线粒体电子传输链(ETC)功能缺陷而被激活的核转录因子的集合。使用喂养RNAi方法,我们针对400多个转录因子,并确定了15个当功能降低时,相对于野生型动物,可重复性和差异性地改变isp-1(Qm150)MIT突变体的发育、胁迫反应和/或繁殖力。其中7个转录因子--AHA-1、CEH-18、HIF-1、Jun-1、NHR-27、NHR-49和CREB Homolog-1(CRH-1)相互作用蛋白TAF-4也是isp-1寿命延长所必需的。当我们测试这七个转录因子参与另外两个MIT突变体,即CLK-1(Qm30)和Tpk-1(Qm162)的寿命时,始终需要TAF-4和HIF-1。我们的发现表明,MIT的表型受多种转录反应的控制,TAF-4和HIF-1可能是指定MIT突变寿命的一般信号轴的一部分。
While numerous life-extending manipulations have been discovered in the nematode Caenorhabditis elegans, one that remains most enigmatic is disruption of oxidative phosphorylation. In order to unravel how such an ostensibly deleterious manipulation can extend lifespan, we sought to identify the ensemble of nuclear transcription factors that are activated in response to defective mitochondrial electron transport chain (ETC) function. Using a feeding RNAi approach, we targeted over 400 transcription factors and identified 15 that, when reduced in function, reproducibly and differentially altered the development, stress response, and/or fecundity of isp-1(qm150) Mit mutants relative to wild-type animals. Seven of these transcription factors – AHA-1, CEH-18, HIF-1, JUN-1, NHR-27, NHR-49 and the CREB homolog-1 (CRH-1)-interacting protein TAF-4 – were also essential for isp-1 life extension. When we tested the involvement of these seven transcription factors in the life extension of two other Mit mutants, namely clk-1(qm30) and tpk-1(qm162), TAF-4 and HIF-1 were consistently required. Our findings suggest that the Mit phenotype is under the control of multiple transcriptional responses, and that TAF-4 and HIF-1 may be part of a general signaling axis that specifies Mit mutant life extension.
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