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Probes for the study of mupirocin resistance in staphylococci
M Rahman1, W C Noble, K G Dyke
1Department of Microbial Diseases, St John's Institute of Dermatology, St Thomas' Hospital, London.
Abstract:
Probes constructed from a 4.05-kb EcoRI digest fragment of a mupirocin resistance plasmid and a 751-bp internal part of this fragment hybridised with DNA from all of 36 independent high-level mupirocin-resistant staphylococci tested from seven centres; most were Staphylococcus aureus. In most instances the probes detected an EcoRI digest fragment of approximately 4 kb. Probes did not hybridise to DNA from low-level resistant strains, nor from strains sensitive to mupirocin.
Insights
DNA probes accurately identified high-level mupirocin resistance in staphylococci, including Staphylococcus aureus. These probes did not detect resistance in low-level resistant or sensitive strains.
Area of Science:
- Microbiology and Molecular Biology
- Antimicrobial Resistance Research
Background:
- Mupirocin is a crucial antibiotic for treating Staphylococcus infections.
- Emergence of mupirocin resistance, particularly high-level resistance, poses a significant clinical challenge.
- Accurate detection of resistance mechanisms is vital for effective treatment strategies.
Purpose of the Study:
- To develop and validate DNA probes for detecting the genetic basis of high-level mupirocin resistance in staphylococci.
- To assess the specificity of these probes against various staphylococcal strains.
Main Methods:
- Construction of DNA probes from specific fragments of a mupirocin resistance plasmid.
- Hybridization of probes with DNA from 36 independent high-level mupirocin-resistant staphylococcal isolates from seven centers.
- Testing probes against DNA from low-level resistant and mupirocin-sensitive strains.
Main Results:
- Probes successfully hybridized with DNA from all tested high-level mupirocin-resistant staphylococci, predominantly Staphylococcus aureus.
- A consistent EcoRI digest fragment of approximately 4 kb was detected in most resistant strains.
- Probes showed no hybridization with DNA from low-level resistant or mupirocin-sensitive staphylococcal strains.
Conclusions:
- The developed DNA probes are effective and specific for identifying high-level mupirocin resistance in staphylococci.
- These probes can aid in the rapid and accurate diagnosis of mupirocin-resistant staphylococcal infections.
- The findings support the genetic basis of high-level resistance being linked to the targeted plasmid fragment.