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Cytochrome P450 associated with insecticide resistance catalyzes cuticular hydrocarbon production in Anopheles gambiae.

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Balabanidou, Vasileia, Kampouraki, Anastasia, MacLean, Marina, Blomquist, Gary J, Tittiger, Claus, Juárez, M Patricia, Mijailovsky, Sergio J, Chalepakis, George, Anthousi, Amalia, Lynd, Amy, Antoine, Sanou, Hemingway, Janet ORCID: https://orcid.org/0000-0002-3200-7173, Ranson, Hilary ORCID: https://orcid.org/0000-0003-2332-8247, Lycett, Gareth ORCID: https://orcid.org/0000-0002-2422-053X and Vontas, John (2016) 'Cytochrome P450 associated with insecticide resistance catalyzes cuticular hydrocarbon production in Anopheles gambiae.'. Proceedings of the National Academy of Sciences of the United States of America, Vol 113, Issue 33, pp. 9268-9273.

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Abstract

The role of cuticle changes in insecticide resistance in the major malaria vector Anopheles gambiae was assessed. The rate of internalization of (14)C deltamethrin was significantly slower in a resistant strain than in a susceptible strain. Topical application of an acetone insecticide formulation to circumvent lipid-based uptake barriers decreased the resistance ratio by ∼50%. Cuticle analysis by electron microscopy and characterization of lipid extracts indicated that resistant mosquitoes had a thicker epicuticular layer and a significant increase in cuticular hydrocarbon (CHC) content (∼29%). However, the CHC profile and relative distribution were similar in resistant and susceptible insects. The cellular localization and in vitro activity of two P450 enzymes, CYP4G16 and CYP4G17, whose genes are frequently overexpressed in resistant Anopheles mosquitoes, were analyzed. These enzymes are potential orthologs of the CYP4G1/2 enzymes that catalyze the final step of CHC biosynthesis in Drosophila and Musca domestica, respectively. Immunostaining indicated that both CYP4G16 and CYP4G17 are highly abundant in oenocytes, the insect cell type thought to secrete hydrocarbons. However, an intriguing difference was indicated; CYP4G17 occurs throughout the cell, as expected for a microsomal P450, but CYP4G16 localizes to the periphery of the cell and lies on the cytoplasmic side of the cell membrane, a unique position for a P450 enzyme. CYP4G16 and CYP4G17 were functionally expressed in insect cells. CYP4G16 produced hydrocarbons from a C18 aldehyde substrate and thus has bona fide decarbonylase activity similar to that of dmCYP4G1/2. The data support the hypothesis that the coevolution of multiple mechanisms, including cuticular barriers, has occurred in highly pyrethroid-resistant An gambiae.

Item Type: Article
Subjects: QX Parasitology > Insects. Other Parasites > QX 515 Anopheles
WA Public Health > Preventive Medicine > WA 240 Disinfection. Disinfestation. Pesticides (including diseases caused by)
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 765 Prevention and control
WH Hemic and Lymphatic Systems > Hematologic Diseases. Immunologic Factors. Blood Banks > WH 190 Hemoglobin and other hemeproteins. Porphyrins (Associated with hemoglobin)
Faculty: Department: Biological Sciences > Vector Biology Department
Digital Object Identifer (DOI): https://doi.org/10.1073/pnas.1608295113
Depositing User: Jessica Jones
Date Deposited: 27 Jul 2016 10:15
Last Modified: 18 May 2018 13:11
URI: http://archive.lstmed.ac.uk/id/eprint/6023

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