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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/44413
Title: Altitudinal and thermal gradients of hepatic Cyp1A gene expression in natural populations of Salmo trutta from high mountain lakes and their correlation with organohalogen loads
Authors: Jarque, Sergio; Gallego, Eva; Bartrons, Mireia; Catalán, Jordi; Grimalt, Joan O.; Piña, Benjamín
Keywords: Gene expression
Organochlorine compounds
Airborne pollution
Quantitative real-time PCR
Issue Date: 2010
Publisher: Elsevier
Citation: Environmental Pollution
Abstract: The biomarker of xenobiotic exposure cytochrome p450A1 (Cyp1A) was used to analyze the biological response to chemical pollution in Salmo trutta (brown trout) from nine high mountain European lakes in Norway, Tatras, Tyrol, and central Pyrenees. Hepatic Cyp1A mRNA levels correlated both with the reciprocal of absolute annual average air temperatures of the sampled lakes and with muscle concentrations of several hydrophobic organohalogen compounds (OC), including chlorinated polychlorobiphenyls (PCB), DDE, and DDT. The correlation between Cyp1A expression and OC content was observed across the whole temperature range (between −0.7 °C and +6.2 °C), but also in the absence of any thermal gradient. We concluded that airborne pollutants accumulate in high mountain lake fish at concentrations high enough to increase Cyp1A expression, among other possible effects. As geographical distribution of semi-volatile OC is strongly influenced by air temperatures, future climate modifications will potentially enhance their physiological effects in lake ecosystems.
Publisher version (URL): http://dx.doi.org/10.1016/j.envpol.2010.01.003
URI: http://hdl.handle.net/10261/44413
ISSN: 0269-7491
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