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Published on: February 14, 2025
Phenotypic peculiarities of batumin-resistant staphylococci
Larisa Churkina1, Zinaida Vasyurenko, Svetlana Bidnenko
1Institute of Microbiology and Virology, National Academy of Sciences of Ukraine, Kyiv, Ukraine.
Likars'Ka Sprava
|February 15, 2008
Summary
Batumin-resistant Staphylococcus aureus variants exhibited altered phenotypes but retained their genetic identity. Genetic analysis confirmed they remained Staphylococcus aureus despite significant changes in cell wall and fatty acid composition.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Staphylococcus aureus is a significant human pathogen.
- Understanding mechanisms of antimicrobial resistance is crucial for public health.
- Batumin is an antimicrobial agent with potential applications.
Purpose of the Study:
- To investigate the characteristics of batumin-resistant Staphylococcus aureus variants.
- To determine if batumin resistance induces significant genetic or phenotypic changes.
- To confirm the species identification of resistant strains.
Main Methods:
- In vitro induction of batumin resistance through continuous subculture.
- Phenotypic characterization including colony morphology, hemolysis, and enzyme production (phosphatase, catalase, lecithinase, coagulase).
- Molecular identification using tRNA-intergenic length polymorphism, femB, and Amplified Fragment Length Polymorphism (AFLP) analysis.
Main Results:
- Batumin-resistant variants displayed altered colony morphology (small, colorless) and loss of hemolytic activity.
- Resistant strains showed reduced or absent production of key enzymes like phosphatase, catalase, lecithinase, and coagulase.
- Cell wall thickness and cellular fatty acid composition were significantly altered in resistant variants.
- Molecular analyses (tRNA-intergenic length polymorphism, femB, AFLP) confirmed the strains remained Staphylococcus aureus.
- No genetic differences were detected by AFLP or mecA gene amplification between susceptible and resistant strains.
Conclusions:
- Batumin resistance in Staphylococcus aureus is associated with profound phenotypic changes.
- Despite phenotypic divergence, genetic analyses confirm the resistant variants remain Staphylococcus aureus.
- The mechanisms of batumin resistance do not appear to involve the mecA gene or major genetic alterations detectable by AFLP.
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