AMES, Iowa — Mosquitoes may be tiny, but they carry some of the deadliest diseases on the planet. Now, a groundbreaking global research effort, including contributions from Dr. Ryan Smith and Dr. Hyeogsun Kwon (a Research Scientist in Smith’s lab) at Iowa State University, has produced the world’s first full cellular “atlas” of the mosquito Aedes aegypti. This is the species responsible for spreading dengue, Zika, yellow fever, and chikungunya.
Published in Cell on October 30, the study maps more than 367,000 individual mosquito cells across 19 different tissues, creating a detailed blueprint of how the insect and several of its tissues function at a biological level. Scientists believe this new framework will accelerate the development of genetic tools and disease-prevention strategies.
“This is the very first time we’ve been able to look at the entire mosquito, cell by cell,” said Dr. Ryan Smith, associate professor in the Department of Plant Pathology, Entomology and Microbiology at Iowa State. “Understanding what makes these mosquitoes such effective disease vectors begins with understanding how their bodies work, and this atlas finally gives us that resolution.”
Why a Mosquito Atlas Matters
Mosquito-borne viruses infect hundreds of millions of people each year, and climate change is expanding the habitat of Aedes aegypti. Controlling mosquitoes often relies on insecticides, which can lose effectiveness as mosquitoes evolve resistance.
The new atlas gives researchers a universal reference tool: a way to examine every mosquito cell type, understand the genes it expresses, and identify potential weak points in the mosquito’s biology that could be targeted to reduce disease transmission.
“A lot of past research has focused on just one tissue like the gut or the antenna,” Smith said. “But mosquitoes are incredibly complex organisms. To truly fight mosquito-borne disease, we need to understand the mosquito as a whole. That’s what this project delivers.”
Iowa State’s Role in a Global Effort
Smith and Kwon contributed directly to analyzing segments of the dataset, focusing on gene expression in key tissues. Their work helped identify how mosquito cells differ between males and females, how blood feeding alters brain and sensory cells, and how the mosquito’s immune system operates.
One of the most striking findings, Smith noted, was the change that occurs in the female mosquito’s brain after it takes a blood meal.
“After feeding, the mosquito essentially shuts down its host-seeking behavior for two to three days,” Smith explained. “The atlas allowed us to see which specific brain cells change during this period that likely cause this change in behavior.”
This discovery may help scientists understand how mosquitoes transition between seeking blood, developing eggs, and searching for water to lay those eggs, all critical steps in the disease transmission cycle.
A Community Resource for the World
The full atlas is freely available and designed to serve as a community resource for scientists worldwide. Its creators hope the data will accelerate genetic engineering approaches, including techniques that render mosquitoes less capable of spreading viruses.
“This opens the door to so many possibilities,” Smith said. “Whether it’s designing new repellents, blocking mosquitoes’ ability to detect humans, or modifying specific tissues so mosquitoes can’t carry viruses, all of that becomes more realistic when we know which genes are active in which cells.”
He added: “The more we learn about mosquito biology, the closer we get to reducing the burden of mosquito-borne diseases worldwide.”
Learn More
The full scientific paper, A single-nucleus transcriptomic atlas of the adult Aedes aegypti mosquito, is available in Cell