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Related Experiment Videos

DNA probe specific for Legionella pneumophila.

P A Grimont, F Grimont, N Desplaces

    Journal of Clinical Microbiology
    |March 1, 1985
    PubMed
    Summary

    Researchers developed a specific DNA probe for detecting Legionella pneumophila. This method removes cross-hybridizing DNA, enabling accurate identification in clinical and water samples.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Accurate detection of Legionella pneumophila is crucial for public health.
    • Existing DNA probes often exhibit cross-hybridization with other bacterial species, limiting specificity.

    Purpose of the Study:

    • To devise a procedure for preparing a highly specific DNA probe for Legionella pneumophila detection.
    • To overcome cross-hybridization issues encountered with total DNA probes.

    Main Methods:

    • Total DNA from L. pneumophila was initially used as a radioactive probe.
    • Southern blotting identified cross-hybridizing restriction fragments in L. pneumophila DNA.
    • BamHI endonuclease digestion and removal of cross-hybridizing fragments generated a specific probe.

    Main Results:

    • Total DNA probes showed cross-hybridization with various bacterial families.
    • Specific BamHI restriction fragments (21.4, 16.2 kbp major; 28.0, 12.8, 10.1 kbp minor) were identified as cross-hybridizing.
    • The modified probe demonstrated high specificity for L. pneumophila in dot and colony hybridization assays.

    Conclusions:

    • A novel procedure effectively generates a specific DNA probe for Legionella pneumophila.
    • This specific probe can be utilized for detecting L. pneumophila in clinical and environmental samples.
    • The methodology is adaptable for creating specific probes for other bacterial species.

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