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Metabolomic fingerprint of cryo-stress in a freeze tolerant insect

By T.C. Hawes, A. Hines, M.R Viant, J.S. Bale, M. Roger Worland and Peter Convey

Abstract

This study employed H-1 NMR spectroscopy to assay the metabolome of the high Arctic freeze-tolerant dipteran larvae, Heleomyza borealis, after recovery from exposure to a range of sub-zero temperature treatments. Our data demonstrate the resilience of freeze tolerance in individuals of this permanently freeze-tolerant species that were acclimated to summer temperatures (5 degrees C): recovery of homeostasis after 48h was not significantly disturbed by 2h exposures to -3, -12, or -20 degrees C. Evidence of homeostatic perturbation to cryo-stress - both in terms of changes in specific metabolite concentrations as well as systemic changes in metabolism determined using multivariate pattern recognition techniques - was expressed almost entirely at a temperature coincident with the significant onset of mortality (-25 degrees C) and considerably below the minimum winter temperatures of its over-wintering habitat (c.-12 degrees C)

Topics: Biology and Microbiology, Zoology, Ecology and Environment
Publisher: Cryo Letters
Year: 2008
OAI identifier: oai:nora.nerc.ac.uk:11499
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