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Must Epidemiologically Impactful Vector Control Interventions Disrupt Mosquito Population Structure? A Case Study of
Tristan P W Dennis1,2, W Moussa Guelbeogo3,4, Heather M Ferguson1
1School of Biodiversity, One Health, and Veterinary Medicine University of Glasgow Glasgow UK.
Evolutionary Applications
|October 29, 2025
Summary
Insecticide-treated nets (ITNs) with pyriproxyfen reduced malaria vector density but did not impact Anopheles gambiae genetic structure or diversity. This suggests current vector control may be insufficient for large, mobile mosquito populations.
Area of Science:
- Genetics
- Epidemiology
- Vector Biology
Background:
- Disease vector control interventions often aim to reduce vector populations.
- While vector density is measured, impacts on population genetics (demography, connectivity) are less understood.
- Anopheles gambiae is a primary malaria vector in Africa.
Purpose of the Study:
- To investigate the impact of pyriproxyfen-treated nets on Anopheles gambiae population genetics.
- To compare genetic structure and diversity between pyrethroid-only and pyriproxyfen-treated net arms.
- To assess if reduced vector density affects mosquito population connectivity and diversity.
Main Methods:
- Analysis of low-coverage whole-genome sequencing data from 893 Anopheles gambiae.
- Comparison of mosquitoes collected during a cluster-randomized control trial in Burkina Faso.
- Assessment of population genetic structure, diversity, nucleotide diversity, and inbreeding coefficients.
Main Results:
- No significant changes in Anopheles gambiae population genetic structure or diversity were observed.
- Low population differentiation and lack of clustering by treatment, time, or space were found.
- Nucleotide diversity and inbreeding coefficients remained stable, with no signatures of selection.
Conclusions:
- Pyriproxyfen-treated nets did not alter Anopheles gambiae genetic structure, likely due to large, mobile populations.
- Epidemiologically significant reductions in vector density may not impact genetic diversity or connectivity.
- This challenges the effectiveness of current vector control strategies for large, widespread vector populations.
