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Related Experiment Videos

Multiple mating types of Mycobacterium smegmatis

Y Mizuguchi, K Suga, T Tokunaga

    Japanese Journal of Microbiology
    |October 1, 1976
    PubMed
    Summary

    Mycobacterium smegmatis exhibits diverse mating systems, with fertility observed only between distinct strain groups. Genes controlling mating are chromosomal but their precise location remains undetermined.

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    Area of Science:

    • Microbiology
    • Genetics

    Background:

    • Mycobacterium smegmatis is a well-studied non-pathogenic mycobacterium.
    • Understanding mating systems in bacteria is crucial for genetic exchange and evolution.

    Purpose of the Study:

    • To investigate the mating systems and genetic exchange in Mycobacterium smegmatis.
    • To classify strains based on mating behavior and identify factors influencing fertility.

    Main Methods:

    • Classification of 19 wild-type Mycobacterium smegmatis strains into five groups based on mating behavior.
    • Performing intergroup and intragroup crosses to assess fertility.
    • Testing the stability of mating genes against curing agents (acridine dye, sodium dodecyl sulfate, heat).

    Main Results:

    • Five distinct mating groups were identified within the 19 wild-type strains.
    • Intragroup crosses were infertile, while eight intergroup crosses were fertile.
    • Chromosome transfer in fertile crosses was predominantly unidirectional.
    • Mating genes demonstrated resistance to curing agents, suggesting chromosomal location.
    • No linkage was found between mating genes and tested chromosomal markers.

    Conclusions:

    • Mycobacterium smegmatis possesses complex, group-specific mating systems.
    • Fertility is restricted to specific intergroup crosses, indicating genetic incompatibility within groups.
    • Mating genes are likely chromosomal but their precise genomic location requires further investigation.

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