Characterization of a mouse-adapted Staphylococcus aureus strain.

Area of Science:

• Microbiology
• Infectious Diseases
• Genomics

Background:

• Staphylococcus aureus (S. aureus) is a major human pathogen requiring novel treatments.
• Existing animal models often use human-adapted strains, limiting clinical relevance.
• Host-specificity of S. aureus strains necessitates development of animal-adapted models.

Purpose of the Study:

• To characterize the mouse-adapted S. aureus strain JSNZ.
• To evaluate JSNZ's virulence and colonization potential in murine models.
• To assess JSNZ as a tool for developing S. aureus therapeutics.

Main Methods:

• Isolation and genomic characterization of mouse-adapted S. aureus JSNZ.
• Murine infection models to assess colonization (nasal, gastrointestinal) and disease severity (renal abscess).
• Comparison of JSNZ with human-derived S. aureus Newman strain.
• Evaluation of genetic modification feasibility of JSNZ.

Main Results:

• JSNZ, an ST88 strain lacking human immune evasion factors, readily colonizes naive mice without antibiotics.
• JSNZ demonstrated superior colonization and caused more severe renal abscesses than the Newman strain.
• JSNZ is amenable to genetic manipulation via phage transduction and electroporation.

Conclusions:

• The mouse-adapted S. aureus strain JSNZ provides a clinically relevant model for S. aureus research.
• JSNZ is a valuable tool for studying mucosal colonization and screening novel vaccines and therapies.
• This strain facilitates the development of more effective strategies against S. aureus infections.