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Genetic heterogeneity in Streptococcus mutans.

A L Coykendall

    Journal of Bacteriology
    |April 1, 1971
    PubMed
    Summary

    Genetic homogeneity in Streptococcus mutans strains was assessed using DNA-DNA reassociation. Results reveal significant genetic heterogeneity, dividing strains into distinct genetic groups that correlate with antigenic types.

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    Area of Science:

    • Microbiology
    • Genetics
    • Molecular Biology

    Background:

    • Streptococcus mutans is a primary cause of dental caries.
    • Understanding the genetic diversity within S. mutans is crucial for developing effective prevention and treatment strategies.

    Purpose of the Study:

    • To assess the genetic homogeneity among eight cariogenic strains of Streptococcus mutans.
    • To determine if genetic groups correlate with known antigenic groups.

    Main Methods:

    • Deoxyribonucleic acid (DNA)-DNA reassociation experiments were performed.
    • DNA was extracted from eight S. mutans strains (GS5, Ingbritt, 10449, FAl, BHT, E49, SLl, KlR).
    • Labeled DNA ((14)C-DNA) was used to form hybrid duplexes with immobilized DNA at controlled temperatures (67°C and 75°C).

    Main Results:

    • Significant genetic heterogeneity was observed among the S. mutans strains.
    • The strains could be divided into three, possibly four, distinct genetic groups based on DNA reassociation patterns.
    • Specific strain pairings showed extensive reassociation (e.g., 10449 with GS5 and Ingbritt; FAl with BHT; SLl with KlR and E49).
    • Hybrid duplexes were thermostable, confirming genetic relatedness.

    Conclusions:

    • Streptococcus mutans is a genetically heterogeneous species.
    • The identified genetic groups closely parallel previously defined antigenic groups.
    • This genetic diversity has implications for understanding S. mutans virulence and developing targeted interventions.

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