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[Lysogeny in Bacillus thuringiensis]

R R Azizbekian, T A Smirnova, I B Minenkova

    Mikrobiologiia
    |November 1, 1980
    PubMed
    Summary

    Researchers investigated Bacillus thuringiensis lysogeny, finding all strains released phages. Isometric phages were common, and Tm2 phage limited the growth of related phages in the galleriae serotype.

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    Area of Science:

    • Microbiology
    • Virology
    • Bacteriology

    Background:

    • Lysogeny, the integration of bacteriophage DNA into a host bacterium's genome, is a significant factor in bacterial evolution and phage-host interactions.
    • Bacillus thuringiensis (Bt) is a soil bacterium known for its insecticidal properties, with its phage populations being an area of ongoing research.

    Purpose of the Study:

    • To analyze the lysogenic potential of various Bacillus thuringiensis serotypes.
    • To characterize the bacteriophages released by these Bt strains.
    • To investigate the impact of specific phage-host interactions on phage proliferation.

    Main Methods:

    • Screening of multiple Bacillus thuringiensis serotypes for lysogeny.
    • Isolation and detection of bacteriophages from bacterial cultures.
    • Characterization of phage morphology (isometric capsid, noncontractible tail).
    • Experimental lysogenization of the galleriae serotype with Tm2 phage.

    Main Results:

    • All examined Bacillus thuringiensis cultures were found to be lysogenic, releasing bacteriophages.
    • Bacteriophages with isometric capsids and noncontractible tails were prevalent in most isolates.
    • Lysogenization of the galleriae serotype with Tm2 phage resulted in limited growth of related phages.
    • Physicochemical parameters of the isolated phages were determined.

    Conclusions:

    • Lysogeny is a common characteristic across diverse Bacillus thuringiensis serotypes.
    • The identified bacteriophages possess specific morphological traits.
    • The Tm2 phage exhibits a potential role in regulating the population dynamics of related phages within specific Bt serotypes.

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