A new method opens the way to studying antiviral immunity in staphylococci: the AVAST2 defense system confirmed in the laboratory strain RN4220
In collaboration with the Laboratory of Bacteriophage Biology at the Institute of Biochemistry and Biophysics, Polish Academy of Sciences (Warsaw), we published a study in Microbial Cell Factories describing a versatile genetic tool for targeted gene inactivation in genetically challenging Staphylococcus aureus strains. The approach uses bacteriophage-mediated plasmid transfer to investigate anti-phage defense systems in their native genomic context. Using the avs2 gene as a model, we demonstrated that the AVAST2 system protects the laboratory strain RN4220 against multiple bacteriophages. The study confirms a previously unrecognized defense mechanism in the S. aureus 8325 lineage and provides a valuable platform for research on anti-phage immunity and phage therapy.