Gene Drives: The Shocking Tech to Erase Species

Genetic technologies known as gene drives are being developed with the potential to intentionally drive entire species to extinction. These drives manipulate inheritance to rapidly spread specific traits throughout a population, defying natural selection. The New World screwworm, a parasitic fly whose larvae consume living flesh, is identified as a prime candidate for the first deployment of this technology.

Historically, the screwworm was eradicated from North America using the sterile-insect technique. However, this method is costly and has not been applied in South America. Gene drives offer a self-spreading and potentially more economical alternative, particularly for species that mate multiple times. This technology could be crucial for controlling pests in regions like South America where older methods proved unfeasible.

While gene drives hold promise for eradicating disease vectors like malaria-carrying mosquitoes, deployment faces regulatory and public opposition, partly due to concerns about genetic engineering. However, proponents argue that gene drives are a natural phenomenon and that their application, like other genetic tools, depends on responsible use. The screwworm's previous eradication in North America without apparent ecological damage supports the feasibility of this approach.

Research projects are already underway to develop gene drives targeting screwworms, including initiatives by Uruguay's INIA and the U.S. DARPA. If successful, this groundbreaking application could pave the way for using gene drives against numerous other pests, including those responsible for spreading devastating diseases like malaria and dengue globally.