<i>Staphylococcus aureus</i>とその類縁菌におけるDNA相同性の検討

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  • Genetic Homologies among <i>Staphylococcus aureus</i> and Related Organisms
  • Staphylococcus aureus ト ソノ ルイエンキン ニ オケル

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DNA-DNA hybridization experiments were carried out in order to determine the genetic homologies among Staphylococcus aureus and related organisms. The strains of Micrococcus luteus, Escherichia coli and Streptomyces aureofaciens were examined as control organisms.<br>When nonenterotoxigenic S. aureus 209p was used as reference DNA, DNA reassociation experiments showed genetic homology values ranging from 52 to 75% with seven enterotoxigenic strains, from 87 to 100% with two nontoxigenic S. aureus and from 25 to 43% with five strains of S. epidermidis, while M. luteus belonging to the same Micrococcaceae exhibited a very low value of homology similar to those of E. coli and Str. aureofaciens.<br>On the contrary, when enterotoxigenic S. aureus S-6 (enterotoxin B) was used as reference DNA, the genetic homology value ranged from 80 to 100% with enterotoxigenic strains, from 63 to 69% with nontoxigenic S. aureus, and from 44 to 66% with S. epidermidis. It was 28% with M. luteus and 24.1% with E. coli and Str. aureofaciens.<br>These results indicate that S. aureus, S. epidermidis and M. luteus can be distinguished from one another on the basis of DNA homology value. In addition, they suggest that the genetic relatedness may be useful for the detection of enterotoxin-producing strains of S. aureus.

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