Authors: GARBUZ, DAVID G.; ZATSEPINA, OLGA G.; PRZHIBORO, ANDREY A.¹; YUSHENOVA, IRINA²; GUZHOVA, IRINA V.³; EVGEN'EV, MICHAEL B.²

Source: Molecular Ecology, Volume 17, Number 21, November 2008 , pp. 4763-4777(15)

Publisher: Wiley-Blackwell

Abstract:

A population of Stratiomys japonica, a species belonging to the family Stratiomyidae (Diptera), common name `soldier flies', occurs in a hot volcanic spring, which is apparently among the most inhospitable environments for animals because of chemical and thermal conditions. Larvae of this species, which naturally often experience temperatures more than 40 °C, have constitutively high concentrations of the normally inducible heat-shock protein Hsp70, but very low level of corresponding mRNA. Larvae of three other species of the same family, Stratiomys singularior, Nemotelus bipunctatus and Oxycera pardalina, are confined to different type semi-aquatic habitats with contrasting thermal regime. However, all of them shared the same pattern of Hsp70 expression. Interestingly, heat-shock treatment of S. japonica larvae activates heat-shock factor and significantly induces Hsp70 synthesis, whereas larvae of O. pardalina, a species from constant cold environment, produce significantly less Hsp70 in response to heat shock. Adults of the four species also exhibit lower, but detectable levels of Hsp70 without heat shock. Larvae of all species studied have very high tolerance to temperature stress in comparison with other Diptera species investigated, probably representing an inherent adaptive feature of all Stratiomyidae enabling successful colonization of highly variable and extreme habitats.

Keywords: Diptera; ecology of larvae; heat-shock proteins; heat stress and saline resistance; Hsp70 expression; Stratiomyidae; thermal adaptation; thermotolerance

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1365-294X.2008.03947.x

Affiliations: 1: Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, 199034 St. Petersburg, Russia, 2: Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str. 32, 119991 Moscow, Russia, 3: Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Ave., 4, 194064 St. Petersburg, Russia

Publication date: 2008-11-01

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