Multidrug-Resistant Proteus mirabilis Strain with Cointegrate Plasmid

Area of Science:

• Microbiology
• Genomics
• Infectious Diseases

Background:

• Proteus mirabilis is a common gut bacterium that can cause severe hospital-acquired infections.
• The prevalence of multidrug-resistant P. mirabilis, particularly those producing extended-spectrum beta-lactamases (ESBLs), is rising globally.
• Research on P. mirabilis, especially whole-genome sequencing, lags behind other major pathogens.

Purpose of the Study:

• To conduct a comprehensive genomic analysis of a multidrug-resistant, ESBL-producing P. mirabilis clinical isolate.
• To investigate mechanisms of antibiotic resistance and virulence in P. mirabilis.
• To compare P. mirabilis genomics with other ESKAPE pathogens.

Main Methods:

• Utilized both short-read and long-read whole-genome sequencing technologies.
• Performed detailed genomic analysis to identify resistance genes, virulence factors, and mobile genetic elements.
• Investigated the CRISPR-Cas system and potential phage targets within the P. mirabilis genome.

Main Results:

• Identified horizontal gene transfer events, suggesting plasmid exchange between P. mirabilis and Klebsiella pneumoniae.
• Located a CRISPR-Cas system and its putative phage targets, offering insights into phage resistance.
• Characterized multiple virulence genes contributing to P. mirabilis pathogenicity.
• Confirmed the presence of ESBL genes conferring multidrug resistance.

Conclusions:

• Genomic insights into P. mirabilis provide a foundation for understanding its increasing resistance and virulence.
• The study highlights potential inter-species gene transfer as a mechanism for resistance acquisition.
• Further research on P. mirabilis is crucial for developing effective treatments against this emerging pathogen.