Transcriptional Regulation of the Ambient Temperature Response by H2A.Z Nucleosomes and HSF1 Transcription Factors in Arabidopsis.

Transcriptional Regulation of the Ambient Temperature Response by H2A.Z Nucleosomes and HSF1 Transcription Factors in Arabidopsis.
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DOI:
10.1016/j.molp.2017.08.014
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发表时间:
2017-10-09
期刊:
影响因子:
27.5
通讯作者:
Wigge PA
Wigge PA
中科院分区:
生物学1区
文献类型:
--
作者:
Cortijo S;Charoensawan V;Brestovitsky A;Buning R;Ravarani C;Rhodes D;van Noort J;Jaeger KE;Wigge PA

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Temperature influences the distribution, range and phenology of plants. The key transcriptional activators of the heat shock response in eukaryotes, the heat shock factors (HSFs), have undergone a large-scale gene amplification in plants. While HSFs are central in heat stress responses, their role in ambient temperature changes is less well understood. We show here that the warm ambient temperature transcriptome is dependent upon the HSFA1 clade of Arabidopsis HSFs, which cause a rapid and dynamic eviction of H2A.Z-nucleosomes at target genes. A transcriptional cascade results in the activation of multiple downstream stress responsive transcription factors, triggering large-scale changes to the transcriptome in response to elevated temperature. H2A.Z-nucleosomes are enriched at temperature responsive genes at non-inducible temperature, and thus likely confer inducibility of gene expression and higher responsive dynamics. We propose that the antagonistic effects of H2A.Z and HSF1 provide a mechanism to activate gene expression rapidly and precisely in response to temperature, while preventing leaky transcription in the absence of an activation signal.
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