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Genetic basis for antibiotic resistance in anaerobes
1Unité des Anaérobies, Institut Pasteur, Paris, France.
Abstract:
This review focuses on genetic and molecular data regarding antibiotic resistance in anaerobes, particularly Clostridium perfringens, Clostridium difficile, Bacteroides species, and Prevotella species. The determinants of resistance are frequently transferable through a conjugation-like process; plasmid self-transfer, plasmid mobilization, or (in Bacteroides species) chromosomal conjugative elements can be involved. The determinants can be localized on transposons. At the genetic level, resistance determinants can be highly specific for one or several anaerobes or may exhibit homology with genes from aerobes. The latter observation suggests that anaerobes are able to exchange genetic material from a "gene pool" shared with aerobic organisms.
Insights
Antibiotic resistance genes in anaerobic bacteria like Clostridium and Bacteroides are often transferable via plasmids and transposons. This genetic exchange suggests anaerobes share a gene pool with aerobic organisms, impacting resistance patterns.
Area of Science:
- Microbiology
- Genetics
- Molecular Biology
Background:
- Antibiotic resistance is a growing concern in anaerobic bacterial infections.
- Understanding the genetic basis of resistance in key anaerobic pathogens is crucial.
Purpose of the Study:
- To review genetic and molecular data on antibiotic resistance in important anaerobic bacteria.
- To explore the mechanisms of resistance gene transfer in anaerobes.
Main Methods:
- Literature review of genetic and molecular studies on antibiotic resistance in anaerobes.
- Analysis of data on resistance determinants and their transfer mechanisms.
Main Results:
- Resistance determinants in anaerobes are frequently transferable via plasmids and transposons.
- Genetic elements mediating resistance can be specific to anaerobes or homologous to those in aerobes.
- Evidence suggests genetic material exchange between anaerobic and aerobic organisms.
Conclusions:
- The transferability of resistance determinants highlights the dynamic nature of antibiotic resistance in anaerobes.
- Homology of resistance genes with those in aerobes indicates a shared genetic pool, complicating resistance management.