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Related Experiment Videos

Glucosyltransferase gene polymorphism among Streptococcus mutans strains.

J S Chia1, T Y Hsu, L J Teng

  • 1School of Dentistry, National Taiwan University, Taipei, Republic of China.

Infection and Immunity
|May 1, 1991
PubMed
Summary

Genetic polymorphisms in Streptococcus mutans serotype c were found using DNA probes. These variations in glucosyltransferase genes suggest complexity within these essential bacterial genes.

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Streptococcus mutans are a primary cause of dental caries.
  • Glucosyltransferases (GTFs) are key enzymes in S. mutans virulence, facilitating sucrose metabolism and biofilm formation.
  • Understanding genetic diversity in GTF genes is crucial for developing targeted prevention strategies.

Purpose of the Study:

  • To investigate genetic polymorphisms in glucosyltransferase (gtf) genes among different serotypes of Streptococcus mutans.
  • To analyze the genetic relatedness of serotype c strains and compare them with other serotypes.
  • To correlate genetic variations with enzymatic activity and adherence properties.

Main Methods:

  • Southern blot analysis using DNA probes specific to the gtfB gene.

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  • Restriction endonuclease digestion (EcoRI and PstI) of genomic DNA from S. mutans serotypes a through h.
  • Assays for glucan synthesis enzymatic activity and sucrose-dependent adherence.

    • Main Results:

    • Genetic polymorphisms were identified in the gtf genes of Streptococcus mutans serotype c strains.
    • Serotypes e and f exhibited similar polymorphisms, while serotypes a, b, d, g, and h did not hybridize with the probes.
    • No significant differences in glucan synthesis or adherence were observed among the studied serotype c strains, despite genetic variations.

    Conclusions:

    • The genetic polymorphisms detected in Streptococcus mutans serotype c strains indicate complexity within the genes encoding glucosyltransferases.
    • These findings suggest that while GTF genes are conserved across S. mutans, significant genetic diversity exists within specific serotypes.
    • Further research into the functional implications of these polymorphisms is warranted to fully understand S. mutans virulence mechanisms.