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Plasmids in the genus Bifidobacterium

B Sgorbati, V Scardovi, D J Leblanc

    Journal of General Microbiology
    |September 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Researchers investigated plasmid DNA in 1461 Bifidobacterium isolates. Approximately 20% contained plasmids, primarily in four species, including human gut bacteria Bifidobacterium longum.

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    Area of Science:

    • Microbiology
    • Genetics
    • Bacterial Plasmids

    Background:

    • Bifidobacterium species are crucial gut commensals in humans and animals.
    • Plasmid DNA can influence bacterial adaptation and traits.
    • Understanding plasmid distribution in Bifidobacterium is important for microbial ecology.

    Purpose of the Study:

    • To determine the prevalence and distribution of plasmid DNA across various Bifidobacterium species.
    • To identify which Bifidobacterium species harbor plasmids and characterize their plasmid profiles.

    Main Methods:

    • Screening of 1461 bacterial isolates from 24 Bifidobacterium species for plasmid DNA.
    • Identification of plasmid-bearing species and analysis of plasmid copy numbers.
    • Characterization of plasmid profiles within specific species.

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    Main Results:

    • Approximately 20% of the examined Bifidobacterium isolates contained detectable plasmids.
    • Plasmids were found in four species: Bifidobacterium longum (human intestine), Bifidobacterium globosum (animals), Bifidobacterium asteroides, and Bifidobacterium indicum (honey bees).
    • Multiple plasmids were common in B. longum and B. asteroides, while B. globosum and B. indicum isolates predominantly had single plasmids.

    Conclusions:

    • Plasmid carriage is not ubiquitous in Bifidobacterium but is present in key species from diverse environments.
    • Specific plasmid profiles may be characteristic of certain Bifidobacterium species, potentially reflecting ecological adaptations.
    • Further research into the function of these plasmids could elucidate their role in Bifidobacterium biology.