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Sequence homology between Inc N group plasmids.

M Konarska-Kozlowska, V N Iyer

    Plasmid
    |November 1, 1983
    PubMed
    Summary

    This study reveals that Inc N group plasmids worldwide share significant DNA sequence homology and similar genetic organization. Researchers found conserved restriction sites and genetic functions across these essential bacterial plasmids.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • Inc N group plasmids are significant in bacterial genetics.
    • Understanding their genetic organization and homology is crucial for molecular biology research.

    Purpose of the Study:

    • To analyze the genetic organization and nucleotide sequence homology of Inc N group plasmids.
    • To compare a characterized Inc N plasmid (pCUI) with nine other Inc N plasmids.

    Main Methods:

    • DNA-DNA hybridization was employed.
    • Southern blotting technique was utilized for analysis.
    • Restriction endonuclease digestion with BglII and KpnI was performed.

    Main Results:

    • N plasmids from diverse global locations exhibit substantial DNA sequence homology.
    • A conserved pattern in the distribution of BglII and KpnI cleavage sites was observed.
    • Restriction fragments with similar mobility often encoded identical genetic functions.
    • In one instance, Inc N plasmid properties were found integrated into the bacterial chromosome.
    • Strains with two Inc N plasmids (R199 and R113) contained only one Inc N plasmid species.

    Conclusions:

    • Inc N plasmids demonstrate significant genetic conservation globally.
    • Restriction site mapping and functional analysis reveal conserved genetic elements.
    • Plasmid integration into the host chromosome can occur.
    • Complex plasmid compositions, including multiple species, require careful characterization.

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