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Controlling malaria mosquito reproduction via the octopamine beta2 receptor

Ellis, D. A.; Bagi, J.; Terry, S.; Doran, E.; Tytheridge, S.; Xu, Y. Y.; Su, M.; Lombardi, M.; Iacomelli, G.; Peirce, M. J.; Ligato, M.; Terrazas, D.; Ntabaliba, W.; Moore, S. J.; Albert, J.; Spaccapelo, R.; Andres, M.

2025-08-24 neuroscience
10.1101/2025.08.20.670845 bioRxiv
Show abstract

Mosquito reproduction in a broad sense involves multiple steps from acoustic recognition of mating partners to egg hatching. We show that the octopamine receptor AgOct{beta}2R controls different aspects of this process in a sexually dimorphic manner. AgOct{beta}2R knockout males present auditory defects that impair their ability to inseminate females, whilst knockout females are sterile. These phenotypes suggest AgOct{beta}2R as a target to impair mosquito reproduction at multiple levels. We test the reproductive effects of the insecticide amitraz, an AgOct{beta}2R agonist, showing that amitraz exposure reduces insemination in the lab but not in the field and has no effects on female sterility, excluding its applicability as a mating disruptor. Pharmacological assays reveal that AgOct{beta}2R sensitivity to amitraz is reduced compared to other arthropods, but its responses can be altered by modifying residues in the binding pocket. Together, our results establish AgOct{beta}2R as a promising target to disrupt mosquito reproduction but emphasize the necessity of developing new tools to exploit this approach.

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