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Staphylococcal enterotoxin A: a chromosomal gene product

W M Shafer, J J Iandolo

    Applied and Environmental Microbiology
    |August 1, 1978
    PubMed
    Summary

    Staphylococcal enterotoxin A (SEA) is produced by a gene located on the chromosome, not a plasmid. This finding clarifies the genetic basis of SEA production in Staphylococcus aureus.

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    Area of Science:

    • Microbiology
    • Genetics
    • Molecular Biology

    Background:

    • Staphylococcus aureus is an opportunistic pathogen responsible for various infections.
    • Staphylococcal enterotoxins, including SEA, are key virulence factors contributing to disease severity.
    • The genetic location of enterotoxin genes (plasmid vs. chromosomal) influences their transmission and expression.

    Purpose of the Study:

    • To determine the genetic location of the staphylococcal enterotoxin A (SEA) gene in Staphylococcus aureus.
    • To differentiate between plasmid-mediated and chromosomal inheritance of SEA production.

    Main Methods:

    • Physical analysis of plasmid DNA from Staphylococcus aureus strains S6 and FRI-100.
    • Genetic analysis to identify the location of the SEA gene.

    Main Results:

    • Physical and genetic analyses revealed that the SEA gene is not located on plasmids in the studied strains.
    • Evidence indicates that staphylococcal enterotoxin A is a product of a chromosomal gene.

    Conclusions:

    • The staphylococcal enterotoxin A gene resides on the chromosome of Staphylococcus aureus.
    • This chromosomal location has implications for understanding SEA epidemiology and control.

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