Transduction of antibiotic resistance in Pseudomomas aeruginosa: relationship between lytic and transducing activity...

Area of Science:

• Microbiology
• Bacteriology
• Virology

Background:

• Pseudomonas aeruginosa is an opportunistic pathogen known for its antibiotic resistance.
• Bacteriophages (phages) are viruses that infect bacteria and can be utilized for gene transfer.
• Lysogenic conversion can alter bacterial phenotypes, including antibiotic resistance.

Purpose of the Study:

• To isolate and characterize a wild-type phage from a lysogenic Pseudomonas aeruginosa strain.
• To investigate the phage's ability to transduce antibiotic resistance determinants.
• To assess the host range and transduction efficiency of the isolated phage.

Main Methods:

• Isolation of bacteriophage AP-423 from a lysogenic Pseudomonas aeruginosa strain.
• Propagation and titration of the phage on various P. aeruginosa recipient strains.
• Transduction experiments to transfer antibiotic resistance genes.

Main Results:

• Phage isolate AP-423 was successfully isolated and propagated.
• The phage exhibited host restriction, lysogenizing only specific recipient strains.
• Transduction capacity (gene sets and frequency) varied significantly between different P. aeruginosa recipient strains.
• Phage propagation titers were also restricted to certain recipient strains.

Conclusions:

• Phage AP-423 can be used to transduce antibiotic resistance determinants in Pseudomonas aeruginosa.
• The phage displays significant host specificity in lysogenization, propagation, and transduction.
• Understanding phage host range is crucial for effective phage therapy and genetic manipulation in P. aeruginosa.