Quantitative Proteomic Analysis of Chikungunya Virus-Infected Aedes aegypti Reveals Proteome Modulations Indicative of Persistent Infection.

The mosquito-borne chikungunya virus (CHIKV) poses a threat to human health in tropical countries throughout the world. The molecular interactions of CHIKV with its mosquito vector Aedes aegypti are not fully understood. Following oral acquisition of CHIKV via salinemeals, we analyzed changes in the proteome of Ae. aegypti in 12 h intervals by label-free quantification using a timsTOF Pro mass spectrometer. For each of the seven time points, between 2647 and 3167 proteins were identified among CHIKV-infected and noninfected mosquito samples, and fewer than 6% of those identified proteins were affected by the virus. Functional enrichment analysis revealed that the three pathways, Endocytosis, Oxidative phosphorylation, and Ribosome biogenesis, were enriched during CHIKV infection. On the other hand, three pathways of the cellular RNA machinery and five metabolism related pathways were significantly attenuated in the CHIKV-infected samples. Furthermore, proteins associated with cytoskeleton and vesicular transport, as well as various serine-type endopeptidases and metallo-proteinases, were modulated in the presence of CHIKV. Our study reveals biological pathways and novel proteins interacting with CHIKV in the mosquito. Overall, CHIKV infection caused minor changes to the mosquito proteome demonstrating a high level of adaption between the vector and the virus, essentially coexisting in a nonpathogenic relationship. The mass spectrometry data have been deposited to the MassIVE repository (https://massive.ucsd.edu/ProteoSAFe/dataset.jsp?task=abfd14f7015243c69854731998d55df1) with the data set identifier MSV000085115.