A Wolbachia factor for male killing in lepidopteran insects

Area of Science:

• Microbiology
• Genetics
• Insect Biology

Background:

• Bacterial symbionts, like Wolbachia, influence insect reproduction.
• Wolbachia causes male-specific lethality in the Asian corn borer (Ostrinia furnacalis) by targeting the Masculinizer (Masc) protein.
• Masc is crucial for masculinization and dosage compensation in Lepidoptera.

Purpose of the Study:

• To identify the mechanism by which Wolbachia induces male killing in insects.
• To investigate the interaction between Wolbachia and host factors involved in sexual development.

Main Methods:

• Identification of a novel Wolbachia protein, Oscar.
• Analysis of the interaction between Oscar and the host Masculinizer (Masc) protein using its ankyrin repeats.
• Experimental expression of Oscar in Ostrinia furnacalis and Bombyx mori embryos.

Main Results:

• A Wolbachia protein, Oscar, was identified and shown to interact with the host Masc protein.
• Embryonic expression of Oscar disrupted Masc-mediated masculinization.
• Oscar expression led to male killing in Ostrinia furnacalis and Bombyx mori.

Conclusions:

• Wolbachia utilizes the Oscar protein to interfere with host masculinization pathways.
• This interaction represents a novel mechanism for Wolbachia-induced male killing in insect hosts.
• The findings provide insights into host-symbiont interactions and reproductive manipulation.