A Comprehensive Multilocus Sequence Typing Scheme for Identification and Genotyping of Staphylococcus Strains

Area of Science:

• Microbiology
• Genetics
• Molecular Biology

Background:

• Coagulase-negative staphylococci are increasingly significant clinically.
• Effective species identification and genotyping methods are crucial for managing these bacteria.

Purpose of the Study:

• To develop a comprehensive multilocus sequence typing (MLST) scheme for Staphylococcus species.
• To evaluate the discriminatory power of six housekeeping genes for genotyping.

Main Methods:

• Selected six housekeeping genes (femA, ftsZ, gap, pyrH, rpoB, tuf) with high allelic polymorphism.
• Developed primers for amplification of these six loci from 180 Staphylococcus strains across 18 species.
• Performed sequence analysis and phylogenetic analysis of concatenated sequences.

Main Results:

• The developed MLST scheme accurately identified species and provided high-resolution typing for all 180 strains.
• Sequence analysis revealed higher nucleotide diversity compared to 16S rRNA.
• Generated 103 distinct sequence profiles, indicating significant genetic diversity within Staphylococcus species.

Conclusions:

• The comprehensive MLST scheme offers superior genotyping capabilities for Staphylococcus strains.
• This method provides accurate species identification and robust discriminatory power for diverse opportunistic species.
• The scheme is a valuable tool for understanding the phylogeny of Staphylococcus, including Staphylococcus aureus.