The eIF2α/ATF4 pathway is essential for stress-induced autophagy gene expression.

The eIF2α/ATF4 pathway is essential for stress-induced autophagy gene expression.
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DOI:
10.1093/nar/gkt563
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发表时间:
2013-09
影响因子:
14.9
通讯作者:
Bruhat A
Bruhat A
中科院分区:
生物学2区
文献类型:
--
作者:
B'chir W;Maurin AC;Carraro V;Averous J;Jousse C;Muranishi Y;Parry L;Stepien G;Fafournoux P;Bruhat A

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在应对不同的环境压力时,eIF2α磷酸化会抑制整体翻译,同时优先翻译ATF4,ATF4是一种主要的调控因子,控制着对适应功能至关重要的关键基因的转录。在此,我们证实eIF2α/ATF4通路在应对氨基酸饥饿或内质网应激时引导一个自噬基因转录程序。eIF2α激酶GCN2和PERK以及转录因子ATF4和CHOP对于增加一组涉及自噬体形成、延伸和功能的基因的转录也是必需的。我们还根据自噬基因对ATF4和CHOP的依赖性以及这些因子与特定启动子顺式元件的结合情况,确定了三类自噬基因。此外,CHOP和ATF4与靶启动子结合的不同组合能够根据应激强度引发不同的转录反应。总体而言,这项研究揭示了eIF2α - ATF4通路在应对应激时对自噬基因转录程序的微调中具有一种新的调控作用。
In response to different environmental stresses, eIF2α phosphorylation represses global translation coincident with preferential translation of ATF4, a master regulator controlling the transcription of key genes essential for adaptative functions. Here, we establish that the eIF2α/ATF4 pathway directs an autophagy gene transcriptional program in response to amino acid starvation or endoplasmic reticulum stress. The eIF2α-kinases GCN2 and PERK and the transcription factors ATF4 and CHOP are also required to increase the transcription of a set of genes implicated in the formation, elongation and function of the autophagosome. We also identify three classes of autophagy genes according to their dependence on ATF4 and CHOP and the binding of these factors to specific promoter cis elements. Furthermore, different combinations of CHOP and ATF4 bindings to target promoters allow the trigger of a differential transcriptional response according to the stress intensity. Overall, this study reveals a novel regulatory role of the eIF2α–ATF4 pathway in the fine-tuning of the autophagy gene transcription program in response to stresses.
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