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A gentamycin resistance plasmid in Staphylococcus aureus
Abstract:
Drug resistance in Staphylococcus aureus is frequently mediated by non-chromosomal DNA molecules referred to as R plasmids. So far, resistance to aminosidic antibiotics was observed with streptomycin [8] and kanamycin-neomycin [3]. Resistance to gentamycin has not been reported in a recent survey by Lacey [7]. In this paper, we describe a strain of S. aureus resistant to gentamycin-kanamycin-tobramycin-sisomycin, and experiments which suggest that the genetic determinant of these resistance characters is plasmid borne.
Insights
A novel Staphylococcus aureus strain exhibits resistance to multiple aminosidic antibiotics, including gentamycin, kanamycin, tobramycin, and sisomycin. Experiments indicate that this drug resistance is transferable, suggesting it is carried on a plasmid.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Staphylococcus aureus frequently develops drug resistance via R plasmids.
- Previous studies documented resistance to streptomycin and kanamycin-neomycin.
- Gentamycin resistance in S. aureus was notably absent in recent surveys.
Purpose of the Study:
- To report a novel strain of Staphylococcus aureus exhibiting resistance to a panel of aminosidic antibiotics.
- To investigate the genetic basis of this multi-drug resistance phenotype.
Main Methods:
- Isolation and characterization of a Staphylococcus aureus strain.
- Phenotypic testing for antibiotic resistance.
- Plasmid analysis to determine the genetic location of resistance determinants.
Main Results:
- A strain of S. aureus was identified with resistance to gentamycin, kanamycin, tobramycin, and sisomycin.
- Experimental evidence suggests the genetic determinant for this resistance is located on a plasmid.
- This finding represents a newly reported resistance profile for S. aureus.
Conclusions:
- The identified S. aureus strain possesses a novel plasmid-borne resistance mechanism against several aminosidic antibiotics.
- This discovery highlights the evolving challenge of antibiotic resistance in S. aureus.
- Further research is warranted to understand the implications of this plasmid-mediated resistance.