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Transferable tetracycline resistance in Clostridium difficile

C J Smith, S M Markowitz, F L Macrina

    Antimicrobial Agents and Chemotherapy
    |June 1, 1981
    PubMed
    Summary

    Tetracycline resistance transfer in Clostridium difficile occurs via cell contact, not plasmids. This resistance likely originates from the bacteria's chromosome, not extrachromosomal DNA.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Clostridium difficile is a significant cause of antibiotic-associated diarrhea.
    • Understanding the mechanisms of antibiotic resistance transfer is crucial for infection control.
    • Tetracycline resistance is a common phenotype observed in clinical isolates.

    Purpose of the Study:

    • To investigate the mechanism of tetracycline resistance transfer in Clostridium difficile.
    • To determine if plasmid DNA is involved in the transmission of tetracycline resistance.
    • To identify the genetic location of tetracycline resistance determinants.

    Main Methods:

    • Conjugation-like experiments were performed between tetracycline-resistant and sensitive Clostridium difficile strains.
    • Resistance transfer was assessed under various conditions, including DNase treatment and cell-free filtrates.
    • Plasmid DNA analysis using restriction endonuclease digestion was conducted on donor, recipient, and transconjugant strains.

    Main Results:

    • Tetracycline resistance transfer required direct cell-to-cell contact and was independent of plasmids.
    • Transconjugants exhibited stable resistance phenotypes identical to the donor.
    • No common plasmid DNA was detected between resistant donors and transconjugants; resistance determinants were not plasmid-encoded.
    • Tetracycline-susceptible derivatives retained the same plasmid profile as resistant parental strains.

    Conclusions:

    • The mechanism of tetracycline resistance transfer in Clostridium difficile is not mediated by detectable plasmids.
    • The tetracycline resistance determinant(s) is likely located on the bacterial chromosome.
    • These findings have implications for understanding and combating antibiotic resistance in Clostridium difficile infections.

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