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Killer phenomenon in pathogenic yeast.

J S Kandel, T A Stern

    Antimicrobial Agents and Chemotherapy
    |April 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Potentially pathogenic yeasts, including Candida and Cryptococcus, were tested for killer activity. Few killer strains were found, with varying sensitivities observed across genera.

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    Area of Science:

    • Microbiology
    • Mycology
    • Yeast Genetics

    Background:

    • Killer yeasts produce toxins that inhibit or kill other yeast strains.
    • Understanding yeast killer activity is important for industrial applications and clinical settings.
    • Previous research has identified killer activity in various yeast genera.

    Purpose of the Study:

    • To investigate the prevalence and specificity of killer activity and sensitivity in potentially pathogenic yeast genera.
    • To compare killer phenotypes across different yeast genera and species.

    Main Methods:

    • Examined 236 yeast strains from four genera: Candida, Cryptococcus, Torulopsis, and Trichosporon.
    • Assessed killer activity and sensitivity using known Saccharomyces and Torulopsis killer strains.

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  • Employed a streak method and lyophilized culture fluid concentration for testing.

    • Main Results:

    • Killer activity was found at low prevalence in Torulopsis and Cryptococcus strains.
    • No killer activity was detected in Candida and Trichosporon isolates.
    • Specificities of killer activity varied even among strains of the same species.
    • Sensitive strains were identified in all genera except Trichosporon.

    Conclusions:

    • Killer activity is not widespread among the examined potentially pathogenic yeast genera.
    • Significant variation in killer activity and sensitivity exists within and between yeast species.
    • Further research is needed to understand the ecological and clinical implications of yeast killer phenotypes.