Short term micro-evolution and PCR-detection of methicillin-resistant and -susceptible Staphylococcus aureus sequence...

Area of Science:

• Microbiology
• Genetics
• Molecular Biology

Background:

• Staphylococcus aureus sequence type 398 (ST 398) is a significant pathogen.
• Understanding the micro-evolutionary dynamics of ST 398 is crucial for infection control.

Purpose of the Study:

• To analyze the micro-evolutionary diversity of ST 398 isolates.
• To develop novel diagnostic tools for ST 398 detection.

Main Methods:

• Pulsed-field gel electrophoresis (PFGE) with Cfr9I enzyme for micro-evolutionary analysis.
• Development and validation of specific Polymerase Chain Reaction (PCR) assays.

Main Results:

• PFGE identified three distinct sub-clones within the 70 ST 398 isolates.
• Significant heterogeneity in spa- and SCCmec-types was observed both between and within sub-clones.
• Developed PCRs demonstrated 100% specificity and high sensitivity for ST 398 detection.

Conclusions:

• ST 398 exhibits considerable micro-evolutionary diversity and genetic heterogeneity.
• The developed PCR assays are effective tools for accurate identification of ST 398 isolates.