Gene dosage screens in yeast reveal core signalling pathways controlling heat adaptation

Gene dosage screens in yeast reveal core signalling pathways controlling heat adaptation
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酵母中的基因剂量筛选揭示了控制热适应的核心信号通路

DOI:
10.1101/2020.08.26.267674
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发表时间:
2020
期刊:
bioRxiv
影响因子:
--
通讯作者:
L.M. Steinmetz
L.M. Steinmetz
中科院分区:
--
文献类型:
--
作者:
A. Johansson;J.D. Smith;L. Parts;L.M. Steinmetz

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Heat stress causes proteins to unfold and lose their function, jeopardizing essential cellular processes. To protect against heat and proteotoxic stress, cells mount a dedicated stress-protective programme, the so-called heat shock response (HSR). Our understanding of the mechanisms that regulate the HSR and their contributions to heat resistance and growth is incomplete. Here we employ CRISPRi/a to down- or upregulate protein kinases and transcription factors inS. cerevisiae. We measure gene functions by quantifying perturbation effects on HSR activity, thermotolerance, and cellular fitness at 23, 30 and 38°C. The integration of these phenotypes allowed us to identify core signalling pathways of heat adaptation and reveal novel functions for the high osmolarity glycerol, unfolded protein response and protein kinase A pathways in adjusting both thermotolerance and chaperone expression. We further provide evidence for unknown cross-talk of the HSR with the cell cycle-dependent kinase Cdc28, the primary regulator of cell cycle progression. Finally, we show that CRISPRi efficiency is temperature-dependent and that different phenotypes vary in their sensitivity to knock-down. In summary, our study quantifies regulatory gene functions in different aspects of heat adaptation and advances our understanding of how eukaryotic cells counteract proteotoxic and other heat-caused damage.
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