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Updated: Apr 18, 2026
Mosquito-Associated Virus Isolation from Field-Collected Mosquitoes
Published on: August 31, 2022
Discovery of mosquito saliva microRNAs during CHIKV infection
Payal D Maharaj1, Steven G Widen2, Jing Huang1
1Department of Pathology, University of Texas Medical Branch, Galveston, Texas, United States of America.
Abstract:
Mosquito borne pathogens are transmitted to humans via saliva during blood feeding. Mosquito saliva is a complex concoction of many secretory factors that modulate the feeding foci to enhance pathogen infection and establishment. Multiple salivary proteins/factors have been identified/characterized that enhance pathogen infection. Here, we describe, for the first time, the identification of exogenous microRNAs from mosquito saliva. MicroRNAs are short, 18-24 nucleotide, non-coding RNAs that regulate gene expression, and are generally intracellular. However, circulating miRNAs have been described from serum and saliva of humans. Exogenous miRNAs have not been reported from hematophagous arthropod saliva. We sought to identify miRNAs in the mosquito saliva and their role in Chikungunya virus (CHIKV) infection. Next generation sequencing was utilized to identify 103 exogenous miRNAs in mosquito saliva of which 31 miRNAs were previously unidentified and were designated novel. Several miRNAs that we have identified are expressed only in the CHIKV infected mosquitoes. Five of the saliva miRNAs were tested for their potential to regulated CHIKV infection, and our results demonstrate their functional role in the transmission and establishment of infection during blood feeding on the host.
Insights
Researchers discovered novel microRNAs (miRNAs) in mosquito saliva, some linked to Chikungunya virus infection. These salivary miRNAs play a functional role in transmitting and establishing infection during mosquito blood feeding.
Area of Science:
- Molecular Biology
- Virology
- Entomology
Background:
- Mosquito saliva contains factors that enhance pathogen transmission during blood feeding.
- MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression, typically intracellular.
- Exogenous miRNAs have not been previously reported in hematophagous arthropod saliva.
Purpose of the Study:
- To identify exogenous microRNAs in mosquito saliva.
- To investigate the role of these salivary miRNAs in Chikungunya virus (CHIKV) infection.
Main Methods:
- Next-generation sequencing was used to identify miRNAs in mosquito saliva.
- Bioinformatic analysis was performed to identify novel miRNAs.
- Functional assays were conducted to assess the role of specific salivary miRNAs in CHIKV infection.
Main Results:
- 103 exogenous miRNAs were identified in mosquito saliva, with 31 designated as novel.
- Several identified miRNAs were exclusively found in CHIKV-infected mosquitoes.
- Five salivary miRNAs demonstrated a functional role in CHIKV transmission and infection establishment.
Conclusions:
- This study reports for the first time the identification of exogenous microRNAs in mosquito saliva.
- Salivary miRNAs are implicated in modulating Chikungunya virus infection during blood feeding.
- These findings open new avenues for understanding vector-host interactions and pathogen transmission.
