Preparation of Infectious Wolbachia from a Mosquito Cell Line.

Area of Science:

• Microbiology and Molecular Biology
• Insect Symbionts
• Genetic Engineering

Background:

• Genetic engineering of Wolbachia requires methods for recovery, maintenance, and reinfection of these obligate intracellular bacteria.
• The intracellular lifestyle of Wolbachia presents unique challenges for manipulation, necessitating adaptations of standard bacteriological techniques.

Purpose of the Study:

• To develop and describe protocols for maximizing the recovery and amplification of infectious Wolbachia (wStri) from host cells.
• To identify conditions that enhance Wolbachia replication and yield for subsequent genetic manipulation and propagation.

Main Methods:

• Utilized the Aedes albopictus C7-10 cell line as a recipient for the wStri strain.
• Prepared infectious Wolbachia inoculum from persistently infected C/wStri1 cells.
• Amplified Wolbachia in naive C7-10 cells pretreated with mitomycin C to inhibit host cell replication.

Main Results:

• Demonstrated that pretreatment of recipient cells with mitomycin C improves Wolbachia recovery, especially from low-level inocula.
• Identified that conditions like cell cycle arrest induced by 20-hydroxyecdysone influence wStri recovery.
• Established a source of wStri inoculum for systematic exploration of conditions favoring bacterial replication and yield.

Conclusions:

• The described protocols facilitate the preparation and amplification of infectious Wolbachia, crucial for advancing genetic engineering efforts.
• Optimized conditions, including host cell pretreatment, enhance the efficiency of Wolbachia manipulation and propagation.
• This work provides a foundation for systematic small-scale manipulations of Wolbachia in infected cells.