Differential transcription profiles inAedes aegyptidetoxification genes after temephos selection

Saavedra-Rodriguez, K., Strode, C., Flores, A. E., Garcia-Luna, S., Reyes-Solis, G., Ranson, H., Hemingway, J. and Black, W. C. (2013) Differential transcription profiles inAedes aegyptidetoxification genes after temephos selection. Insect molecular biology, 23 (2). pp. 199-215. ISSN 0962-1075 DOI https://doi.org/10.1111/imb.12073

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The mosquito Aedes aegypti is the main vector of Dengue and Yellow Fever flaviviruses. The organophosphate insecticide temephos is a larvicide that is used globally to control Ae. aegypti populations; many of which have in turn evolved resistance. Target site alteration in the acetylcholine esterase of this species has not being identified. Instead, we tracked changes in transcription of metabolic detoxification genes using the Ae. aegypti ‘Detox Chip’ microarray during five generations of temephos selection. We selected for temephos resistance in three replicates in each of six collections, five from México, and one from Perú. The response to selection was tracked in terms of lethal concentrations (LC50). Uniform upregulation was seen in the epsilon class glutathione-S-transferase genes (eGSTs) in strains from México prior to laboratory selection, while eGSTs in the Iquitos Perú strain became upregulated following five generations of temephos selection. While expression of many esterase genes (CCE) increased with selection, no single esterase was consistently upregulated and this same pattern was noted in the cytochrome P450 genes (CYP) and in other genes involved in reduction or oxidation of xenobiotics. Bioassays using GST, CCE and CYP inhibitors suggest that various CCE instead of GSTs are the main metabolic mechanism conferring resistance to temephos. We show that temephos selected strains show no cross resistance to permethrin and that genes associated with temephos selection are largely independent of those selected with permethrin in a previous study.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QH Natural history > QH426 Genetics
Divisions: Biology
Date Deposited: 14 Mar 2016 14:26
URI: http://repository.edgehill.ac.uk/id/eprint/7271

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