Abstract: Mosquito populations and mosquito-borne disease cases have surged across the United States in recent years, driven by rising insecticide resistance, climate change, and global travel. These challenges have renewed national interest in biological strategies for mosquito abatement, including the Sterile Insect Technique (SIT), Wolbachia Incompatible Insect Technique (WIIT), and innovative Genetic Engineering (GE) approaches.
At Synvect, we have developed Next-Generation Sterile Insect Technique (NextGenSIT), a safe, cost-effective, and scalable solution for effective mosquito population suppression. NextGenSIT uses CRISPR-mediated knockout of two essential genes that occurs autonomously during the development of eggs produced by a cross between Cas9 and gRNA strains. This egg-based production, storage, and deployment strategy dramatically reduces costs and simplifies logistics, making large-scale implementation feasible for regional and national mosquito control programs.
Because released GE males are sterile and non-heritable, NextGenSIT remains fully self-limiting and is easily regulated under the U.S. EPA’s existing biopesticide framework. Pilot studies with Aedes aegypti have demonstrated robust safety, efficacy, and complete containment in both laboratory and field environments. Together, these results highlight NextGenSIT as a practical, high-impact addition to integrated mosquito management programs, combining genetic precision with operational simplicity to advance public health protection.
A key enabling component of NextGenSIT is SEPARATOR, a genetic cassette that allows high-throughput, high-precision sex-sorting of early-stage mosquito larvae. The U.S. EPA does not regulate SEPARATOR-sorted and irradiated males used in SIT programs and classifies SEPARATOR as an inert ingredient in Wolbachia-based (WIIT) applications. This regulatory clarity enables the nationwide deployment of SEPARATOR across multiple mosquito species, providing a critical tool for accelerating the adoption of modern, biologically based mosquito control strategies.
