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• W2314497617 abstract "ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials ESR 28:43-60 (2015) - DOI: https://doi.org/10.3354/esr00679 The transcriptome-wide effects of exposure to a pyrethroid pesticide on the Critically Endangered delta smelt Hypomesus transpacificus Ken M. Jeffries1,2,*, Lisa M. Komoroske1,2, Jennifer Truong1, Inge Werner3, Matthias Hasenbein1,2,4, Simone Hasenbein1,4, Nann A. Fangue2, Richard E. Connon1 1Anatomy, Physiology & Cell Biology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, California 95616, USA 2Wildlife, Fish & Conservation Biology, University of California, Davis, One Shields Avenue, Davis, California 95616, USA 3Swiss Centre for Applied Ecotoxicology, Ueberlandstrasse 133, 8600 Duebendorf, Switzerland 4Aquatic Systems Biology Unit, Department of Ecology and Ecosystem Management, Technische Universität München, Mühlenweg 22, 85354 Freising, Germany *Corresponding author: kenmjeffries@gmail.com ABSTRACT: Research into the effects of contaminants on fishes is often conducted on well-studied model test species, whose responses may be different than those of endangered species. We developed an oligonucleotide microarray consisting of 12595 genes to examine the effects of the pesticide permethrin on an endangered fish in California, USA, the delta smelt Hypomesus transpacificus. The microarray was used in combination with quantitative PCR (qPCR) assessments. We exposed larval delta smelt to permethrin for 96 h at concentrations of 0.69, 1.37, 2.56, 4.84, 12.88 and 24.94 µg l-1, and compared the responses to a control group. The 96 h 50% lethal concentration (LC50) was 4.07 µg l-1, which is lower than those reported for model test species and similar to other endangered species. With increasing exposure concentration, we detected the differential expression of 3342 microarray features with elevated expression of genes involved in protein degradation and apoptosis, and decreased expression of immune function genes. Functional analysis indicated that genes involved in protein degradation, immune function, an unfolded protein response, metabolism and cell signaling cascades were affected by exposure to permethrin. Many of the gene responses in the 0.69 µg l-1 treatment group differed in their directional change in expression from those at higher exposure concentrations, suggesting a potential mechanistic threshold of sub-lethal toxicity at concentrations below the lowest observed effect concentration (LOEC) of 2.56 µg l-1. These results are consistent with non-monotonic response patterns to contaminants, and demonstrate the effects on a sensitive fish species of a widely used pyrethroid pesticide at concentrations below those that affect model test species. KEY WORDS: Permethrin · Sub-lethal effects · Gene expression · Non-monotonic response · Sensitive fish species · Neurotoxicity Full text in pdf format Supplementary material PreviousNextCite this article as: Jeffries KM, Komoroske LM, Truong J, Werner I and others (2015) The transcriptome-wide effects of exposure to a pyrethroid pesticide on the Critically Endangered delta smelt Hypomesus transpacificus. Endang Species Res 28:43-60. https://doi.org/10.3354/esr00679 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in ESR Vol. 28, No. 1. Online publication date: June 24, 2015 Print ISSN: 1863-5407; Online ISSN: 1613-4796 Copyright © 2015 Inter-Research." @default.
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• W2314497617 date "2015-06-24" @default.
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• W2314497617 title "The transcriptome-wide effects of exposure to a pyrethroid pesticide on the Critically Endangered delta smelt Hypomesus transpacificus" @default.
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• W2314497617 doi "https://doi.org/10.3354/esr00679" @default.
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