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Comparative genomics of Staphylococcus aureus musculoskeletal isolates
James E Cassat1, Paul M Dunman, Fionnuala McAleese
1Department of Microbiology and Immunology, mail slot 511, University of Arkansas for Medical Sciences, 4301 W. Markham, Little Rock, AR 72205, USA.
Journal of Bacteriology
|January 5, 2005
Summary
This study highlights genomic differences between Staphylococcus aureus clinical isolates (UAMS-1, UAMS-601) and lab strain RN6390. These findings are crucial for understanding S. aureus pathogenesis and developing targeted treatments.
Area of Science:
- Microbiology
- Genomics
- Infectious Diseases
Background:
- Research on Staphylococcus aureus pathogenesis often uses limited lab strains like RN6390.
- Clinical isolates may possess unique genetic attributes not found in lab strains.
- UAMS-1 and UAMS-601 are hypervirulent clinical isolates of S. aureus.
Purpose of the Study:
- To compare the genome content of two hypervirulent S. aureus clinical isolates (UAMS-1, UAMS-601) with the laboratory strain RN6390 and other sequenced strains.
- To identify specific genetic differences that may contribute to the hypervirulence of UAMS-1 and UAMS-601.
Main Methods:
- Comparative genomic hybridization using amplicon-based microarrays and Affymetrix GeneChips.
- Analysis of genome content across UAMS-1, UAMS-601, RN6390, and seven other sequenced S. aureus strains.
Main Results:
- UAMS-1 and UAMS-601 possess distinct genomic features compared to RN6390, including the presence of the cna gene and absence of isaB, sarT, sarU, and sasG.
- The UAMS isolates are genetically most similar to the EMRSA-16 clone.
- RN6390, NCTC 8325, and COL form a distinct genetic cluster, distantly related to the UAMS isolates and EMRSA-16.
Conclusions:
- The study underscores the genetic uniqueness of lab strain RN6390 compared to clinical S. aureus isolates.
- Identified genomic differences (e.g., cna, isaB, sarT, sarU, sasG) may explain the hypervirulence of UAMS isolates.
- Findings provide a basis for further research into S. aureus pathogenesis using clinically relevant strains.