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Chromosomal-DNA amplification in Bacillus subtilis.

C R Wilson, A E Morgan

    Journal of Bacteriology
    |August 1, 1985
    PubMed
    Summary

    Tetracycline resistance in Bacillus subtilis mutants was linked to amplified DNA. Loss of resistance correlated with the disappearance of this amplified DNA, suggesting its role in maintaining tetracycline resistance.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Tetracycline resistance is a significant challenge in bacterial infections.
    • Understanding the genetic mechanisms of antibiotic resistance is crucial for developing new treatments.
    • Bacillus subtilis serves as a model organism for studying bacterial genetics.

    Purpose of the Study:

    • To isolate and characterize tetracycline-resistant mutants of Bacillus subtilis.
    • To investigate the genetic basis of stable tetracycline resistance.
    • To determine the relationship between amplified DNA and tetracycline resistance phenotype.

    Main Methods:

    • Isolation of tetracycline-resistant mutants using protoplasting and regeneration.
    • Analysis of chromosomal DNA using restriction digests (HindIII, EcoRI).
    • Transductional mapping with bacteriophage PBS1 to determine gene loci.

    Main Results:

    • Four stable tetracycline-resistant mutants (RAD1, RAD2, RAD6, RAD7) were identified.
    • Three mutants (RAD1, RAD6, RAD7) exhibited tandemly duplicated chromosomal DNA (10-20 kb).
    • The tetracycline resistance (tet) locus mapped near the origin of replication and the guaA locus; amplified DNA was cotransduced with tet.

    Conclusions:

    • Amplified chromosomal DNA is closely associated with stable tetracycline resistance in Bacillus subtilis.
    • The loss of tetracycline resistance is accompanied by the loss of amplified DNA.
    • This suggests a mechanism where DNA amplification plays a role in maintaining antibiotic resistance.

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