Mosquito Preference for Human Versus Animal Biting Has Genetic Basis

Malaria-Transmitting Mosquitoes’ Preference for Cattle May Be Due to Chromosome Anomaly

Villagers and cattle on dirt road
Villagers and cattle along the road near Pimperena in southern Mali. A UC Davis study reports that mosquito preference for human versus animal biting has a genetic basis. Photo: Yoosook Lee/UC Davis

Quick Summary

  • There is a genetic basis to the feeding preferences of mosquitoes
  • Using genetics to better understand mosquito behavior can help improve control strategies

Mosquitoes are more likely to feed on cattle than on humans if they carry a specific chromosomal rearrangement in their genome. This reduces their odds of transmitting the malaria parasite, according to a University of California, Davis, study published Sept. 15 in the journal PLOS Genetics.

Rates of malaria transmission depend on whether mosquitoes bite humans or animals, and whether they rest after that meal in an area where they will encounter pesticides.

Bradley Main, a researcher in the Vector Genetics Lab at the UC Davis School of Veterinary Medicine, and his colleagues investigated whether there is a genetic basis to host choice and resting behavior in Anopheles arabiensis. That species of mosquito has become the primary vector of malaria in east Africa due to its broader host range and the frequent use of pesticide-treated bed nets, which kill other species that live closely with humans.

“Whether there is a genetic basis to feeding preferences in mosquitoes has long been debated,” Main said. “Using a population genomics approach, we have established an association between human feeding and a specific chromosomal rearrangement in the major east African malaria vector. This work paves the way for identifying specific genes that affect this critically important trait.”

Using genetics to help stop malaria’s spread 

Using genetics to better understand and track mosquito behavior can improve local control strategies. This knowledge may also open novel avenues for stopping malaria’s spread, such as genetically modifying mosquitoes to prefer cattle over people.

The researchers sequenced the genomes of 23 human-fed and 25 cattle-fed mosquitoes collected indoors and outdoors from the Kilobero Valley in Tanzania. They identified a genetic component that contributes to the mosquito’s host choice but not its choice of resting place.

They narrowed down the gene region associated with cattle feeding to a chromosomal rearrangement called the 3Ra inversion.

The study is the first to use genomic tools to find a genetic basis for earlier observations that inversions can be linked to a preference for cattle in mosquitoes.

While the findings provide strong support that the inversion in An. arabiensis is linked to cattle feeding, researchers need to test a larger geographic area to confirm the connection.

The study was funded by the National Institutes of Health.

Media Resources

Bradley Main, UC Davis School of Veterinary Medicine, 530-752-7333 ,

Gregory Lanzaro, UC Davis School of Veterinary Medicine, (530) 752-5652,

Kat Kerlin, UC Davis News and Media Relations, 530-750-9195,

Primary Category

Secondary Categories

Environment Food & Agriculture Science & Technology