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Heat shock response: lessons from mouse knockouts
1Centre de Biologie du Développement, UMR5547, Toulouse, France. Elisabeth.Christians@cict.fr
Abstract:
Organisms are endowed with integrated regulatory networks that transduce and amplify incoming signals into effective responses, ultimately imparting cell death and/or survival pathways. As a conserved cytoprotective mechanism from bacteria to humans, the heat shock response has been established as a paradigm for inducible gene expression, stimulating the interests of biologists and clinicians alike to tackle fundamental questions related to the molecular switches, lineage-specific requirements, unique and/or redundant roles, and even efforts to harness the response therapeutically. Gene targeting studies in mice confirm HSF1 as a master regulator required for cell growth, embryonic development, and reproduction. For example, sterility of Hsf1-null female but not null male mice established strict requirements for maternal HSF1 expression in the oocyte. Yet Hsf2 knockouts by three independent laboratories have not fully clarified the role of mammalian HSF2 for normal development, fertility, and postnatal neuronal function. In contrast, Hsf4 knockouts have provided a consistent demonstration for HSF4's critical role during lens formation. In the future, molecular analysis of HSF knockout mice will bring new insights to HSF interactions, foster better understanding of gene regulation at the genome level, lead to a better integration of the HSF pathway in life beyond heat shock, the classical laboratory challenge.
Insights
The heat shock response (HSR) is a conserved cytoprotective mechanism. Gene targeting studies reveal distinct roles for heat shock factors (HSFs) in development and reproduction, with HSF1 crucial for oocyte development and HSF4 for lens formation.
Area of Science:
- Molecular Biology
- Genetics
- Cellular Biology
Background:
- The heat shock response (HSR) is a conserved cytoprotective mechanism across organisms.
- HSR involves integrated regulatory networks that transduce signals into cellular responses, including cell death and survival pathways.
- Understanding HSR is crucial for addressing fundamental questions in gene expression and therapeutic applications.
Purpose of the Study:
- To investigate the roles of heat shock factors (HSFs) in mammalian development and function using gene targeting.
- To clarify the lineage-specific requirements and functions of HSF1, HSF2, and HSF4.
- To explore the therapeutic potential of harnessing the HSR pathway.
Main Methods:
- Gene targeting studies in mice (knockout models).
- Analysis of HSF1, HSF2, and HSF4 knockout phenotypes.
- Molecular analysis of HSF interactions and gene regulation.
Main Results:
- HSF1 is a master regulator essential for cell growth, embryonic development, and reproduction, with specific maternal requirements in oocytes.
- Hsf2 knockouts have yielded less clear results regarding its role in development, fertility, and neuronal function.
- Hsf4 knockouts consistently demonstrate its critical role in lens formation.
Conclusions:
- HSF1 plays a vital role in female reproduction and oocyte development.
- The precise functions of HSF2 require further elucidation.
- HSF4 is indispensable for normal lens development.
- Future studies on HSF knockout mice will enhance understanding of HSF interactions, gene regulation, and the broader implications of the HSF pathway.
