A gene drive is a self-propagating genetic modification that can spread through a sexually reproducing population even if it confers no survival advantage — or even a disadvantage — to individual organisms. Using CRISPR-based mechanisms, a gene drive copies itself onto both chromosomes during reproduction, ensuring that nearly 100% of offspring inherit the modification rather than the usual 50%. Over multiple generations, the modified gene can sweep through an entire wild population.
The most prominent application of gene drive research is malaria control. The Target Malaria consortium, funded by the Bill & Melinda Gates Foundation, is developing gene drives in Anopheles mosquitoes that could either suppress mosquito populations or make them unable to transmit the malaria parasite. Given that malaria kills over 600,000 people annually (predominantly children in sub-Saharan Africa), the potential humanitarian impact is enormous. Laboratory demonstrations have shown gene drives can collapse caged mosquito populations within a few generations.
Gene drives also present unprecedented ecological and ethical questions. Releasing a self-spreading genetic modification into the wild is essentially irreversible — once deployed, a gene drive cannot easily be recalled. Unintended ecological consequences of suppressing or modifying an entire species are difficult to predict. These concerns have prompted extensive biosafety research, including the development of "daisy chain" gene drives designed to be self-limiting, spreading only through a local population before naturally diluting. Regulatory frameworks for gene drive deployment are still being developed internationally. For deeper coverage, see SynBioIntel.