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Updated: Aug 10, 2026
Building a Better Mosquito: Identifying the Genes Enabling Malaria and Dengue Fever Resistance in A. gambiae and A. aegypti Mosquitoes
Published on: July 4, 2007
Acute insecticide exposure uncovers genotype-specific transcriptomic responses underlying toxicity and resistance in
Lise Pingault1, Leslie Rault1, Daniel R Swale2
1Department of Entomology, University of Nebraska-Lincoln, Lincoln, NE 68583, USA.
Abstract:
Short-term exposure of mosquitoes to insecticides offers a valuable opportunity to identify early molecular responses that underpin toxicity and resistance. Using 3' RNA-sequencing, we investigated genotype-specific transcriptomic changes in pyrethroid-susceptible (Rockefeller; ROCK) and -resistant (Puerto Rico; PR) Aedes aegypti following short-term exposure (30 min) to the pyrethroid insecticide deltamethrin. The ROCK strain exhibited minimal transcriptional remodeling, and few differentially expressed genes (DEGs), suggesting limited acute sensitivity at the tested dose. In contrast, the PR strain displayed 67 DEGs enriched in pathways related to insecticide metabolism, energy homeostasis, and neuroactive ligand-receptor interactions. Consistent with known resistance mechanisms, the PR strain showed strong constitutive and inducible expression of detoxification-related cytochrome P450 (CYP) genes, including CYP6BB2, CYP6M11, and CYP4C38, as well as upregulation of CYP9J family genes linked to resistance loci in comparison to ROCK. Additional molecular distinctions highlighted altered cuticle synthesis, diverse neuroreceptor expression patterns, including GPCRs and glutamate receptors and epigenetic signatures, such as histone downregulation and reduced DNMT2 expression, suggesting enhanced transcriptional flexibility in the PR strain. Gene co-expression analyses supported greater metabolic adaptability in PR mosquitoes compared to ROCK. Together, these findings reveal that resistance to deltamethrin in Ae. aegypti is not only mediated by detoxification enzymes and reduced cuticular permeability but also involves neuromodulatory and epigenetic components. This work underscores the utility of short-term transcriptomic profiling for uncovering insecticide response mechanisms and highlights candidate genes for functional validation. These insights can guide the design of next-generation insecticides and resistance management interventions.
