Field-Caught Mosquitoes Show Resistance to Pyrethroids Due to CYP6P3 Enzyme
Author Information
Author(s): Pie Müller, Emma Warr, Bradley J. Stevenson, Patricia M. Pignatelli, John C. Morgan, Andrew Steven, Alexander E. Yawson, Sara N. Mitchell, Hilary Ranson, Janet Hemingway, Mark J. I. Paine, Martin J. Donnelly
Primary Institution: Liverpool School of Tropical Medicine
Hypothesis
Can we identify enzymes that contribute to metabolic resistance to pyrethroids in wild Anopheles gambiae populations?
Conclusion
The study found that the CYP6P3 enzyme is significantly overexpressed in pyrethroid-resistant Anopheles gambiae, indicating its role in metabolic resistance.
Supporting Evidence
- CYP6P3 was significantly overexpressed in mosquitoes that survived exposure to permethrin.
- The study identified CYP6P3 as the first enzyme in wild Anopheles gambiae capable of metabolising pyrethroids.
- High survival rates of mosquitoes against permethrin were observed, indicating strong resistance.
- Microarray analysis showed consistent overexpression of CYP6P3 in resistant mosquitoes compared to susceptible ones.
Takeaway
Some mosquitoes can survive pesticide exposure because they have special proteins that help them break down the chemicals. This study found one of those proteins in mosquitoes from Ghana.
Methodology
The study involved collecting wild Anopheles gambiae mosquitoes, measuring gene expression for over 250 genes, and using microarray analysis to identify overexpressed enzymes.
Potential Biases
Potential confounding effects from comparing field-caught mosquitoes with laboratory strains.
Limitations
The study design may underestimate true fold differences in gene expression due to the nature of comparing selected survivors with a mixed control group.
Participant Demographics
The majority of sampled mosquitoes were Anopheles gambiae s.s. belonging to the molecular S form, with a high frequency of the L1014F kdr allele.
Statistical Information
P-Value
6.69×10−19
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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