Scientists believe they have found a quirky way to fight mosquito-spread diseases such as dengue, yellow fever and Zika – by turning male insects deaf so they struggle to mate and breed.
Mosquitoes have sex while flying in mid-air and the males rely on hearing to chase down a female, based on her attractive wingbeats.
The researchers did an experiment, altering a genetic pathway that male mosquitoes use for this hearing. The result – they made no physical contact with females, even after three days in the same cage.
Female mosquitoes are the ones that spread diseases to people, and so trying to prevent them having babies would help reduce overall numbers.
The team from the University of California, Irvine studied Aedes aegypti mosquitoes, which spread viruses to around 400 million people a year.
They closely observed the insects’ aerial mating habits – that can last between a few seconds to just under a minute – and then figured out how to disrupt it using genetics.
They targeted a protein called trpVa that appears to be essential for hearing.
In the mutated mosquitoes, neurons normally involved in detecting sound showed no response to the flight tones or wingbeats of potential mates.
The alluring noise fell on deaf ears.
In contrast, wild (non-mutant) males were quick to copulate, multiple times, and fertilised nearly all the females in their cage.
The researchers from the University of California, Santa Barbara, who have published their work in the journal PNAS, said the effect of the gene knock-out was “absolute”, as mating by deaf males was entirely eliminated.
Dr Joerg Albert, from the University of Oldenburg in Germany, is an expert on mosquito mating and I asked him what he made of the research.
He said attacking sense of sound was a promising route for mosquito control, but it needed to be studied and managed.