Wolbachia modulates Chikungunya replication in Aedes albopictus

Area of Science:

• Vector-borne disease research
• Microbial-insect interactions
• Arbovirology

Background:

• Aedes albopictus mosquitoes are primary vectors for chikungunya virus (CHIKV).
• These mosquitoes naturally harbor Wolbachia bacteria, which manipulate host reproduction.
• Wolbachia's role in CHIKV replication and mosquito life-history traits is not fully understood.

Purpose of the Study:

• To investigate the impact of Wolbachia removal on CHIKV replication in Aedes albopictus.
• To examine how CHIKV infection affects the life-history traits of Wolbachia-free Aedes albopictus.
• To explore the interaction between Wolbachia density and CHIKV replication.

Main Methods:

• Generation of Wolbachia-free Aedes albopictus.
• Infection of both Wolbachia-infected and Wolbachia-free mosquitoes with CHIKV.
• Quantification of CHIKV replication in mosquitoes over time.
• Assessment of mosquito survival, oviposition, and hatching rates.

Main Results:

• Wolbachia-free mosquitoes exhibited heterogeneous CHIKV replication, unlike Wolbachia-infected ones.
• In infected mosquitoes, CHIKV replication increased then stabilized, coinciding with decreased Wolbachia density.
• CHIKV infection did not alter survival, oviposition, or hatching in Wolbachia-free mosquitoes.

Conclusions:

• Wolbachia is not essential for CHIKV replication but may optimize it.
• Wolbachia presence influences CHIKV replication dynamics and viral load.
• Wolbachia may play a regulatory role in CHIKV infection within Aedes albopictus, potentially affecting transmission.