Accra: Target Malaria, a non-profit research consortium based at Imperial College, London, is exploring a genetic technology that could reduce mosquito populations and help curb malaria transmission across Africa. The approach, known as Gene-Drive, aims to genetically modify malaria-carrying mosquitoes so their populations decline over time and ultimately reduce the spread of the malaria parasite.
According to Ghana News Agency, Dr. Federica Bernadino, a researcher at the Department of Life Sciences at Imperial College, London, noted that although malaria remains both preventable and treatable, progress against the disease has stalled in recent years. The gene-drive technology is being explored in response to growing resistance to insecticides and anti-malarial drugs, highlighting the urgent need for sustainable control strategies.
Dr. Bernadino explained that the technology focuses on identifying and disrupting genes responsible for mosquito reproduction, rendering mosquitoes sterile. The aim is to reduce mosquito populations or limit their ability to spread malaria. She emphasized that reducing female mosquito populations is crucial, as they are the ones that bite humans and require blood to produce eggs.
The gene-drive technology enhances genetic inheritance, allowing modified genes to be passed on to nearly 100 percent of offspring, as opposed to the typical 50 percent. This rapid spread of genetic modification through mosquito populations could lead to a significant decline in mosquito reproduction and eventually cause population collapse after several generations.
In controlled studies, involving around 600 mosquitoes, the genetic modification was observed to spread quickly across generations, resulting in a steep decline in reproduction rates. Dr. Bernadino highlighted that Africa hosts more than 700 mosquito species, but only a few are responsible for most malaria transmission. The gene-drive approach specifically targets malaria-carrying species, thereby minimizing potential environmental impacts.
Ongoing studies are assessing ecological risks and the possibility of other species filling ecological roles if malaria-carrying mosquito populations decrease. One significant advantage of gene-drive technology is that it requires only the release of a small number of modified mosquitoes, unlike conventional methods that necessitate repeated large-scale releases. The genetic modification spreads naturally through mating.
In Ghana, Target Malaria is conducting environmental and entomological studies to better understand mosquito populations and ecosystems. The researchers are also engaging with policymakers, local communities, and stakeholders to raise awareness about the technology.
Dr. Bernadino stated that no gene-drive mosquitoes have been released anywhere in the world yet. Extensive regulatory approvals, environmental assessments, and public consultations are required before any release can occur. The gene-drive mosquitoes could complement existing malaria control strategies, such as bed nets, insecticides, and medication.
The ultimate goal of the technology is not just to alter mosquito behavior but to reduce mosquito populations to levels too low to sustain malaria transmission. Dr. Bernadino concluded that if mosquito populations drop significantly, the malaria parasite cannot survive, potentially interrupting transmission.