Battle of the mosquitoes
Battle of the mosquitoes
Tags: Genetically modified mosquitoes, Malaria, MosquitoesAdepoju, P, Nature Medicine, 2025.
The mosquito was frozen in place. Its tiny body, no longer buzzing, lay still on the cold metal surface, caught in a moment of stasis. A few minutes earlier, it had been active, darting around Oxitec’s research facility, a modified version of nature’s most dangerous killer. “We put them on ice because that slows them down”, an Oxitec scientist explained, adjusting the microscope. “It makes our job easier”.
This laboratory in Abingdon, England, is where an ambitious mosquito control project is unfolding. The work being done here — modifying Anopheles stephensi mosquitoes to fight malaria—has implications not just for Djibouti, where the genetically modified insects are being released, but for the entire African continent. Outside, it’s a chilly 7 °C, but the lab is surprisingly warm and humid: a digital thermometer plugged in beside the microscope reads 21.1 °C — perfectly mimicking a mosquito’s natural habitat. Large cages fill a section, each holding different generations of modified mosquitoes, bred with a self-limiting gene that ensures that only male offspring survive when they mate with wild females. On one side of the lab, scientists peer into microscopes, searching for a tiny fluorescent marker inside the mosquitoes’ bodies — a glowing signature that confirms the genetic modification was successful. Each mosquito is carefully examined (Fig. 1), its fate decided under the magnifying glass.
