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Comparative Transcriptomic Analysis of Insecticide-Resistant Aedes aegypti from Puerto Rico Reveals

Dieunel Derilus1, Lucy Mackenzie Impoinvil1, Ephantus J Muturi1

  • 1Entomology Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA.

Genes
|August 26, 2023
PubMed
Summary

Insecticide resistance in Aedes aegypti mosquitoes is a growing problem. This study identified key detoxification genes, like Cytochrome P450s, overexpressed in resistant mosquitoes, offering targets for new control strategies.

Keywords:
Aedes aegyptiPuerto RicoRNA-Seqdetoxification genesinsecticide resistancemosquitoesorganophosphate resistancepyrethroid resistance

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Area of Science:

  • Entomology
  • Molecular Biology
  • Public Health

Background:

  • Aedes aegypti mosquitoes transmit arboviruses like dengue and Zika.
  • Insecticide resistance in Aedes aegypti is a significant challenge for vector control.
  • Understanding the genetic basis of insecticide resistance is crucial for effective management.

Purpose of the Study:

  • To investigate gene expression patterns associated with resistance to malathion, alphacypermethrin, and lambda-cyhalothrin in Aedes aegypti from Puerto Rico.
  • To identify candidate detoxification genes and pathways involved in insecticide resistance.

Main Methods:

  • Illumina RNA-Seq was used to analyze gene expression in resistant and susceptible Aedes aegypti populations.
  • Comparative analysis of gene expression profiles between resistant and susceptible strains.

Main Results:

  • Cytochrome P450 genes were frequently overexpressed in resistant mosquitoes.
  • Specific detoxification genes showed overexpression related to individual insecticides or multiple insecticides.
  • Enrichment analysis revealed overrepresentation of monooxygenase, iron binding, and serine protease activities.
  • Cuticular protein genes were generally downregulated in resistant populations.

Conclusions:

  • The study identified candidate genes and pathways linked to pyrethroid and organophosphate resistance in Aedes aegypti.
  • Findings can inform the development of molecular tools for resistance detection.
  • Results support the design of improved insecticide resistance management strategies.