Galleria mellonella and the Bac-to-Bac Expression System: A Convenient Model for Testing Molecules Intended to...

Area of Science:

• Entomology
• Molecular Biology
• Biotechnology

Background:

• Viruses are natural insect pathogens, offering a promising biocontrol strategy.
• Slow action of viral biocontrol agents necessitates genetic modification for improved efficacy.
• The Bac-to-Bac system provides a platform for engineering recombinant viruses.

Purpose of the Study:

• To develop and validate a method for infecting pest insects with recombinant baculoviruses.
• To assess the impact of viral infection and recombinant protein expression on insect viability.
• To enable the identification of pathogenic effects induced by virus-expressed molecules.

Main Methods:

• Utilized the Bac-to-Bac system for generating recombinant baculovirus expressing eGFP.
• Infected the model insect, *Galleria mellonella*, with the recombinant virus.
• Monitored infection rates, viral spread, protein expression, and insect activity post-infection.

Main Results:

• Achieved 100% infection rate in *G. mellonella*.
• Demonstrated consistent viral spread and gradual eGFP expression within insects.
• Insects remained viable and active up to 5 days post-infection.

Conclusions:

• The Bac-to-Bac system facilitates efficient infection and expression of recombinant viruses in insects.
• This approach allows for rapid assessment of viral pathogenicity and the effects of expressed molecules.
• Enhanced viral biocontrol strategies can be developed through genetic engineering.