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Related Experiment Videos

Bioassay for specific DNA sequences using a non-radioactive probe.

J L Hartley, M Berninger, J A Jessee

    Gene
    |January 1, 1986
    PubMed
    Summary
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    The SFV Gene Expression System.

    Methods in molecular medicine·2011

    This study introduces a new DNA detection method using a probe-vector for high-efficiency transformation of E. coli. This novel assay accurately detects hepatitis B virus DNA in serum and has potential for multiplex pathogen detection.

    Area of Science:

    • Molecular Biology
    • Biotechnology
    • Medical Diagnostics

    Background:

    • Accurate detection of specific DNA sequences is crucial for diagnostics.
    • Existing methods may have limitations in sensitivity, efficiency, or multiplexing capabilities.

    Purpose of the Study:

    • To develop and validate a novel, non-radioactive DNA detection method using a probe-vector.
    • To demonstrate the probe-vector method's utility for detecting hepatitis B virus (HBV) DNA in human serum.
    • To assess the assay's potential for simultaneous detection of multiple pathogens.

    Main Methods:

    • A probe-vector system was designed, incorporating a plasmid origin of replication and an antibiotic resistance gene.
    • The probe-vector efficiently transforms competent Escherichia coli cells only after hybridizing to a specific DNA target, forming a circular molecule.

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  • The assay generates quantitative, colored bacterial colonies on agar plates, with an internal standard for monitoring recovery and transformation efficiency.

    • Main Results:

    • The probe-vector method demonstrated high efficiency in transforming E. coli.
    • The assay successfully detected hepatitis B virus (HBV) DNA in human serum with a sensitivity of 0.1 pg.
    • Results were quantitative and proportional to target DNA concentration over a wide range.

    Conclusions:

    • The probe-vector method offers a sensitive, quantitative, and efficient approach for specific DNA sequence detection.
    • This assay is effective for diagnosing HBV infection and shows promise for multiplex pathogen detection in clinical samples.