Role of semaphorin-1a in the developing visual system of the disease vector mosquito Aedes aegypti
Autor(es): Mysore Keshava,Flannery Ellen,Leming Matthew T,Tomchaney Michael,Shi Lucy,Sun Longhua,O'Tousa Joseph E,Severson David W,Duman-Scheel Molly
Resumo: Despite the devastating impact of mosquito-borne illnesses on human health, very little is known about mosquito developmental biology, including development of the mosquito visual system. Mosquitoes possess functional adult compound eyes as larvae, a trait that makes them an interesting model in which to study comparative developmental genetics. Here, we functionally characterize visual system development in the dengue and yellow fever vector mosquito Aedes aegypti, in which we use chitosan/siRNA nanoparticles to target the axon guidance gene semaphorin-1a (sema1a). Immunohistochemical analyses revealed the progression of visual sensory neuron targeting that results in generation of the retinotopic map in the mosquito optic lobe. Loss of sema1a function led to optic lobe phenotypes, including defective targeting of visual sensory neurons and failed formation of the retinotopic map. These sema1a knockdown phenotypes correlated with behavioral defects in larval photoavoidance. The results of this investigation indicate that Sema1a is required for optic lobe development in A. aegypti and highlight the behavioral importance of a functioning visual system in preadult mosquitoes.
Palavras-Chave: Aedes aegypti; Semaphorin; Development; Eye; Mosquito; Nanoparticle; Optic lobe; Sensory system; siRNA; Targeting; Vision
Imprenta: Developmental Dynamics : An Official Publication of the American Association of Anatomists, v. 243, n. 11, p.1457-1469, 2014
Identificador do objeto digital: 10.1002/dvdy.24168
Descritores: Aedes aegypti - Biochemistry ; Aedes aegypti - Pathogenesis ; Aedes aegypti - Proteins ; Aedes aegypti - RNA ; Aedes aegypti - Dengue
Data de publicação: 2014
