Alphavirus transducing system: tools for visualizing infection in mosquito vectors

Area of Science:

• Virology
• Molecular Biology
• Entomology

Background:

• Alphavirus transducing systems (ATSs) are derived from mosquito-borne RNA viruses and are valuable for gene expression studies.
• Alphaviruses, particularly Sindbis virus (SINV), exhibit properties suitable for gene expression in insect vectors, including persistent infection with minimal cytopathology.
• ATSs can be engineered to express foreign genes or trigger RNA interference (RNAi) for various research applications.

Purpose of the Study:

• To present a method for producing Sindbis virus (SINV) containing a Green Fluorescent Protein (GFP) reporter.
• To demonstrate the utility of ATSs for tracking viral infections and assessing vector competence in mosquitoes.
• To provide a tool for studying vector-pathogen interactions and viral replication cycles.

Main Methods:

• Production of infectious, full-length RNA from a linearized SINV cDNA clone.
• Introduction of RNA into permissive cells via electroporation to generate infectious virus particles.
• Infection of mosquitoes with the engineered SINV and assessment of vector competence by detecting fluorescence and monitoring virus transmission.

Main Results:

• Successful production of SINV expressing a fluorescent reporter (GFP).
• Demonstrated utility of GFP reporter for estimating virus spread, infection rates, and dissemination in mosquitoes.
• Enabled rapid assessment of vector competence through fluorescence detection and transmission monitoring.

Conclusions:

• ATSs, specifically engineered SINV with fluorescent reporters, are effective tools for studying viral infections in vectors.
• The presented method facilitates the production of such tools for research on vector-pathogen interactions and transmission.
• Fluorescent reporters offer a convenient and rapid means to gauge virus spread and vector competence.