Gene

Cell biology

Molecular biology

Ecology

Biology

Culex pipiens

RNA silencing

Gene silencing

Larva

Genetics

RNA interference

Gene knockdown

Pupa

Culex

Small hairpin RNA

Gene expression

Journal of Medical Entomology

The soft bodies and aquatic habitats of mosquito larvae pose a challenge for applying standard RNA-interference techniques to silence expression of target genes. Here we describe a novel technique for delivering double-stranded RNA into mosquito larvae by exploiting the larva's dehydration tolerance. Larvae were dehydrated in a NaCl solution and then rehydrated in water containing double-stranded RNA. Using larvae of Culex pipiens (L.) we demonstrated the principle by knocking down expression of the gene encoding heat shock protein 90. The knockdown persisted through the pupal stage and into adulthood, with a knockdown of ≈77% still evident on the third day of adult life. We anticipate that this relatively simple procedure will prove useful for knocking down expression of other genes as well, in larvae of this mosquito and in others.

Rehydration Driven RNAi: A Novel Approach for Effectively Delivering dsRNA to Mosquito Larvae