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Low heat shock thresholds in wild Antarctic inter-tidal limpets (Nacella concinna)

Clark, Melody S.; Geissler, Paul; Waller, Catherine; Fraser, Keiron P. P.; Barnes, David K. A.; Peck, Lloyd S.

Authors

Melody S. Clark

Paul Geissler

Keiron P. P. Fraser

David K. A. Barnes

Lloyd S. Peck



Abstract

Heat shock proteins (HSPs) are a family of genes classically used to measure levels of organism stress. We have previously identified two HSP70 genes (HSP70A and HSP70B) in sub-tidal populations of the Antarctic limpet (Nacella concinna). These genes are up-regulated in response to increased seawater temperatures of 15C or more during acute heat shock experiments, temperatures that have very little basis when considering the current Antarctic ecology of these animals. Therefore, the question was posed as to whether these animals could express HSP70 genes when subjected to more complex environmental conditions, such as those that occur in the inter-tidal. Inter-tidal limpets were collected on three occasions in different weather conditions at South Cove, Rothera Point, over a complete tidal cycle, and the expression levels of the HSP70 genes were measured. Both genes showed relative up-regulation of gene expression over the period of the tidal cycle. The average foot temperature of these animals was 3.3C, far below that of the acute heat shock experiments. These experiments demonstrate that the temperature and expression levels of HSP production in wild animals cannot be accurately extrapolated from experimentally induced treatments, especially when considering the complexity of stressors in the natural environment. However, experimental manipulation can provide molecular markers for identifying stress in Antarctic molluscs, provided it is accompanied by environmental validation, as demonstrated here.

Journal Article Type Article
Publication Date Mar 1, 2008
Journal CELL STRESS & CHAPERONES
Print ISSN 1355-8145
Electronic ISSN 1466-1268
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 13
Issue 1
Pages 51-58
APA6 Citation Clark, M. S., Geissler, P., Waller, C., Fraser, K. P. P., Barnes, D. K. A., & Peck, L. S. (2008). Low heat shock thresholds in wild Antarctic inter-tidal limpets (Nacella concinna). Cell Stress and Chaperones, 13(1), 51-58. doi:10.1007/s12192-008-0015-7
DOI https://doi.org/10.1007/s12192-008-0015-7
Keywords Cell Biology; Biochemistry