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- W1963189968 abstract "Abstract A mutation in the second transmembrane domain of the GABA receptor subunit, Rdl, is associated with resistance to insecticides such as dieldrin and fipronil. Molecular cloning of Rdl cDNA from a strain of the malaria mosquito, Anopheles gambiae , which is highly resistant to dieldrin revealed this mutation (A296G) as well as another mutation in the third transmembrane domain (T345M). Wild‐type, A296G, T345M and A296G + T345M homomultimeric Rdl were expressed in Xenopus laevis oocytes and their sensitivities to fipronil, deltamethrin, 1,1,1‐trichloro‐2,2‐bis(p‐chlorophenyl) ethane ( DDT ), imidacloprid and spinosad were measured using two‐electrode voltage‐clamp electrophysiology. Spinosad and DDT had no agonist or antagonist actions on Rdl. However, fipronil, deltamethrin and imidacloprid decreased GABA ‐evoked currents. These antagonistic actions were either reduced or abolished with the A296G and the A296G + T345M mutations while T345M alone appeared to have no significant effect. In conclusion, this study identifies another mutation in the mosquito Rdl that is associated with insecticide resistance. While T345M itself does not affect insecticide sensitivity, it may serve to offset the structural impact of A296G. The present study also highlights Rdl as a potential secondary target for neonicotinoids and pyrethroids. image We show for the first time that deltamethrin (a pyrethroid insecticide) and imidacloprid (a neonicotinoid insecticide) act directly on the insect GABA receptor, Rdl. Our findings highlight Rdl as a potential secondary target of pyrethroids and neonicotinoids mutations in which may contribute to resistance to these widely used insecticides." @default.
- W1963189968 created "2016-06-24" @default.
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- W1963189968 date "2015-09-17" @default.
- W1963189968 modified "2023-10-03" @default.
- W1963189968 title "The neonicotinoid imidacloprid, and the pyrethroid deltamethrin, are antagonists of the insect Rdl GABA receptor" @default.
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- W1963189968 doi "https://doi.org/10.1111/jnc.13290" @default.
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