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Mol Cell. 2016 Apr 7;62(1):63-78. doi: 10.1016/j.molcel.2016.02.025. Epub 2016 Mar 24.

Mammalian Heat Shock Response and Mechanisms Underlying Its Genome-wide Transcriptional Regulation.

Author information

1
Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14850, USA.
2
Baker Institute for Animal Health, Cornell University, Ithaca, New York 14850, USA.
3
Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14850, USA. Electronic address: jtl10@cornell.edu.

Abstract

The heat shock response (HSR) is critical for survival of all organisms. However, its scope, extent, and the molecular mechanism of regulation are poorly understood. Here we show that the genome-wide transcriptional response to heat shock in mammals is rapid and dynamic and results in induction of several hundred and repression of several thousand genes. Heat shock factor 1 (HSF1), the "master regulator" of the HSR, controls only a fraction of heat shock-induced genes and does so by increasing RNA polymerase II release from promoter-proximal pause. Notably, HSF2 does not compensate for the lack of HSF1. However, serum response factor appears to transiently induce cytoskeletal genes independently of HSF1. The pervasive repression of transcription is predominantly HSF1-independent and is mediated through reduction of RNA polymerase II pause release. Overall, mammalian cells orchestrate rapid, dynamic, and extensive changes in transcription upon heat shock that are largely modulated at pause release, and HSF1 plays a limited and specialized role.

PMID:
27052732
PMCID:
PMC4826300
DOI:
10.1016/j.molcel.2016.02.025
[Indexed for MEDLINE]
Free PMC Article

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