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Size doesn't matter in the heat shock response.

David Pincus1

  • 1Nine Cambridge Center, Whitehead Institute for Biomedical Research, Cambridge, MA, 02142, USA. pincus@wi.mit.edu.

Current Genetics
|August 10, 2016
PubMed
Summary

Heat shock factor 1 (Hsf1) is not the master regulator of the heat shock response. Rapid inactivation revealed Hsf1 controls only chaperone genes, not broad thermal adaptation, highlighting its specific role in protein homeostasis.

Keywords:
ChaperonesHeat shockHsf1Hsp70Hsp90Proteostasis

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Area of Science:

  • Molecular Biology
  • Cellular Stress Response
  • Genetics

Background:

  • Heat shock factor 1 (Hsf1) is traditionally considered the primary regulator of the heat shock response in eukaryotes.
  • Yeast's essential Hsf1 has historically limited direct studies on its full transcriptional role under basal and stress conditions.

Purpose of the Study:

  • To directly determine the transcriptional contribution of Hsf1 under basal and heat shock conditions.
  • To investigate the scope of Hsf1's regulatory network beyond its presumed role as a master regulator.

Main Methods:

  • Utilized a chemical genetics strategy enabling rapid inactivation of Hsf1.
  • Analyzed transcriptomic changes following Hsf1 inactivation under thermal stress.

Main Results:

  • The majority of the heat shock response is independent of Hsf1.
  • Hsf1 primarily regulates a specific set of chaperone protein genes.
  • Hsf1's role is focused on restoring protein-folding homeostasis, not broad thermal adaptation.

Conclusions:

  • Hsf1's regulon is limited in scope but critical for cellular fitness.
  • The heat shock response involves significant Hsf1-independent pathways.
  • Hsf1's key function is maintaining protein homeostasis under stress.