UC IRVINE (US)—A new strain of mosquitoes in which the females can’t fly may help curb the transmission of dengue fever, one of the world’s most pressing public health issues.
Researchers at the University of California, Irvine, and colleagues from the University of Oxford and Oxitec Ltd. created the new breed and expect the flightless females to die quickly in the wild, curtailing the number of mosquitoes and reducing—or even eliminating—dengue transmission.
Males of the strain can fly but do not bite or convey disease.
Dengue fever causes flu-like symptoms. There are 50 million to 100 million cases per year, and nearly 40 percent of the global population is at risk.
The dengue virus is spread through the bite of infected female Aedes aegypti mosquitoes, and there is no vaccine or treatment.
When genetically altered male mosquitoes mate with wild females and pass on their genes, females of the next generation are unable to fly.
Scientists estimate that if released, the new breed could sustainably suppress the native mosquito population in six to nine months.
The approach offers a safe, efficient alternative to harmful insecticides. The study appears in the early online edition of the Proceedings of the National Academy of Sciences.
“Current dengue control methods are not sufficiently effective, and new ones are urgently needed,” says Anthony James, distinguished professor of microbiology and molecular genetics and molecular biology and biochemistry at UC Irvine.
“Controlling the mosquito that transmits this virus could significantly reduce human morbidity and mortality.”
Using concepts developed by Oxitec’s Luke Alphey, the study’s senior author, researchers made a genetic alteration in the mosquitoes that disrupts wing muscle development in female offspring, rendering them incapable of flight.
Males’ ability to fly is unaffected, and they show no ill effects from carrying the gene.
“The technology is completely species-specific, as the released males will mate only with females of the same species,” Alphey explains.
“It’s far more targeted and environmentally friendly than approaches dependent upon the use of chemical spray insecticides, which leave toxic residue.”
“Another attractive feature of this method is that it’s egalitarian: All people in the treated areas are equally protected, regardless of their wealth, power, or education,” he adds.
While the current work is focused on the dengue fever vector, the researchers note that this approach could be adapted to other mosquito species that spread such diseases as malaria and West Nile fever.
The research is receiving funding support from the Foundation for the National Institutes of Health through the Grand Challenges in Global Health initiative, which was launched to support breakthrough advances for health challenges in the developing world.
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