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RNA interference, arthropod-borne viruses, and mosquitoes
Irma Sanchez-Vargas1, Emily A Travanty, Kimberly M Keene
1Arthropod-Borne and Infectious Diseases Laboratory, Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO 80523, USA.
Virus Research
|April 8, 2004
Summary
RNA interference (RNAi) is an antiviral pathway in mosquitoes. Modifying this pathway could create mosquitoes unable to transmit arboviruses like dengue virus (DENV).
Area of Science:
- Molecular Biology
- Virology
- Entomology
Background:
- RNA interference (RNAi) is a conserved antiviral mechanism in eukaryotes.
- Mosquito vector competence for arboviruses may be influenced by variations in RNAi pathway activity.
- Aedes species are significant vectors of medically important arboviruses.
Purpose of the Study:
- To investigate the presence and function of the RNAi pathway in arbovirus-transmitting mosquitoes.
- To explore the potential of RNAi-based strategies for developing virus-refractory mosquito vectors.
- To lay the groundwork for generating genetically modified mosquitoes resistant to arboviruses.
Main Methods:
- Evidence for RNAi in Aedes aegypti and Aedes albopictus cells was demonstrated using recombinant viruses and synthetic small interfering RNAs (siRNAs).
- Virus-induced gene silencing mechanisms were investigated.
- Transfection of mosquito cells with specific RNA fragments and hairpin RNAs was performed to assess antiviral effects.
Main Results:
- Recombinant Sindbis viruses expressing dengue-2 virus (DENV-2) RNA fragments inhibited DENV-2 replication in Aedes aegypti.
- Transfection of C6/36 cells with arboviral double-stranded RNA or siRNAs reduced homologous virus replication.
- A hairpin DENV-2-specific RNA generated virus-resistant C6/36 cells.
Conclusions:
- The RNAi pathway is functional in Aedes mosquitoes and can be triggered by arboviral RNA.
- Exploiting RNAi offers a promising strategy for developing genetically modified mosquitoes refractory to arboviruses.
- This approach could significantly alter vector competence and reduce arbovirus transmission.