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Plasmid-mediated resistance to gentamicin in Staphylococcus aureus
Abstract:
Two strains isolated from a recent outbreak of infections by gentamicin-resistant Staphylococcus aureus were examined to determine whether genetic control of this resistance is plasmid or chromosomally mediated. Curing techniques indicated a plasmid location in both strains. Physical isolation and characterization of the plasmid deoxyribonucleic acid from one strain revealed that the determinant for gentamicin resistance resides on a 50S plasmid.
Insights
Gentamicin resistance in Staphylococcus aureus strains is controlled by plasmids. Curing techniques and plasmid DNA analysis confirmed the resistance determinant is located on a 50S plasmid in these outbreak strains.
Area of Science:
- Microbiology
- Genetics
- Molecular Biology
Background:
- Recent outbreaks of gentamicin-resistant Staphylococcus aureus infections highlight the need to understand resistance mechanisms.
- Staphylococcus aureus is a significant human pathogen, and antibiotic resistance poses a major public health threat.
Purpose of the Study:
- To determine if gentamicin resistance in two clinical Staphylococcus aureus strains is plasmid-mediated or chromosomally mediated.
- To characterize the genetic basis of gentamicin resistance in these strains.
Main Methods:
- Curing techniques were employed to assess the role of plasmids in gentamicin resistance.
- Plasmid deoxyribonucleic acid (DNA) was physically isolated and characterized from one resistant strain.
Main Results:
- Curing experiments indicated that gentamicin resistance is plasmid-located in both examined Staphylococcus aureus strains.
- Characterization of plasmid DNA revealed that the gentamicin resistance determinant resides on a 50S plasmid.
Conclusions:
- The genetic basis for gentamicin resistance in these outbreak strains of Staphylococcus aureus is plasmid-mediated.
- The identified 50S plasmid carries the determinant for gentamicin resistance, providing insights into antibiotic resistance transfer mechanisms.