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Plasmid curing effect of trovafloxacin
1Laboratory of Genetics, Department of Biology MCA, University of Camerino, 62032, Camerino, Italy.
FEMS Microbiology Letters
|March 14, 2000
Summary
Sub-inhibitory concentrations of trovafloxacin, a fluoroquinolone antibiotic, were found to cause plasmid loss in Escherichia coli. This "episome-curing" effect occurred across various plasmid types, suggesting a broad impact on bacterial genetics.
Area of Science:
- Microbiology
- Molecular Biology
- Pharmacology
Background:
- Fluoroquinolones are a class of synthetic broad-spectrum antibacterial drugs.
- Antibiotic resistance is a growing global health concern, often mediated by plasmids.
- Understanding how antibiotics affect plasmid stability is crucial for combating resistance.
Purpose of the Study:
- To investigate the impact of sub-inhibitory concentrations of trovafloxacin on plasmid maintenance in Escherichia coli.
- To determine if trovafloxacin can induce plasmid curing.
- To explore the characteristics of plasmids affected by trovafloxacin.
Main Methods:
- Quantitative PCR was used to measure plasmid DNA levels.
- Plasmid-borne functions were quantified to assess plasmid loss.
- Experiments were conducted using Escherichia coli with three different plasmid types.
Main Results:
- Trovafloxacin at sub-inhibitory concentrations (MIC to 1/8 MIC) induced a significant, though incomplete, episome-curing effect.
- This effect was observed across plasmids varying in copy number, size, and replication origin.
- The mechanism of curing was unlikely related to alterations in DNA supercoiling.
Conclusions:
- Sub-inhibitory concentrations of trovafloxacin can lead to the loss of plasmids in Escherichia coli.
- Trovafloxacin demonstrates a broad episome-curing capability, independent of specific plasmid features.
- Further research is needed to elucidate the precise mechanism of action and its implications for antibiotic resistance.