Related Experiment Video
Updated: Jan 9, 2026
Quantifying Fitness Costs in Transgenic Aedes aegypti Mosquitoes
Published on: September 15, 2023
Pickpocket315 affects male mating behavior in the yellow fever mosquito Aedes aegypti
Claudia A S Wyer1,2, I Alexandra Amaro2, Sylvie Pitcher2
1Department of Life Sciences, Imperial College London, Ascot SL5 7PY, United Kingdom.
Abstract:
The molecular basis of mating behavior in the important disease vector mosquito, Aedes aegypti, remains poorly characterized. We investigated the functional role of a pickpocket gene, ppk315, in male mating behavior using both RNAi-mediated knockdown and CRISPR/Cas9 approaches. Behavioral assays revealed that RNAi-treated males (dsPPK315) made fewer mating attempts, were less responsive to female acoustic cues, and were less likely to achieve copulation, though their latency to initiate contact when attempts were made was comparable to controls. Males with a CRISPR/Cas9-induced disruption to ppk315 exhibited reduced success in inseminating multiple females, consistent with previous reports from RNAi knockdown males, ruling out off-target effects as the source of behavioral changes. In contrast to the results of behavioral assays with RNAi, ppk315 mutant males (ppk315-/-) attempted copulation as frequently as wild-type males (ppk315+/+) but were slower to contact females. Despite these impairments in one-on-one interactions, both dsPPK315 and ppk315-/- males displayed normal mating success under competitive swarm-like conditions, potentially due to the socially facilitated activation of mating behavior. Collectively, our findings support a role for ppk315 in the initiation of mating behaviors via sensory detection, with context-dependent consequences for reproductive success.
Insights
The pickpocket gene ppk315 is crucial for male Aedes aegypti mosquito mating initiation, influencing sensory responses to females. Its precise role in mating behavior is context-dependent.
Area of Science:
- Neuroethology
- Genetics
- Vector Biology
Background:
- Mating behavior in disease vector mosquitoes like Aedes aegypti is vital for population control but poorly understood at the molecular level.
- Identifying genes involved in male mating behavior is key to developing novel control strategies.
Purpose of the Study:
- To investigate the functional role of the pickpocket gene ppk315 in male Aedes aegypti mating behavior.
- To determine if ppk315 is essential for sensory perception and behavioral responses during courtship.
Main Methods:
- Utilized RNA interference (RNAi) to knock down ppk315 expression in male mosquitoes.
- Employed CRISPR/Cas9 gene editing to create ppk315 knockout mutants (ppk315⁻/⁻).
- Conducted behavioral assays to assess mating attempts, responsiveness to acoustic cues, copulation success, and insemination rates.
Main Results:
- RNAi-mediated knockdown (dsPPK315) males showed reduced mating attempts and responsiveness to female cues.
- CRISPR/Cas9 mutants (ppk315⁻/⁻) exhibited slower female contact but similar mating attempt frequency compared to wild-type.
- Both dsPPK315 and ppk315⁻/⁻ males displayed normal mating success in competitive swarm conditions, suggesting context-dependent effects.
Conclusions:
- The ppk315 gene plays a significant role in initiating male mosquito mating behavior, likely through sensory detection mechanisms.
- Impairments in ppk315 affect courtship initiation in one-on-one interactions but not in socially facilitated group settings.
- Findings highlight ppk315 as a potential target for modulating mosquito reproductive success.
