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Related Experiment Videos

Nanoliter scale PCR with TaqMan detection

O Kalinina1, I Lebedeva, J Brown

  • 1Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda MD 20892, USA.

Nucleic Acids Research
|May 15, 1997
PubMed
Summary

This study demonstrates a sensitive PCR method using a TaqMan assay to detect single DNA template molecules. This approach shows promise for quantifying DNA in clinical samples.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Polymerase Chain Reaction (PCR) is a fundamental technique for amplifying DNA.
  • Accurate quantification of DNA template molecules is crucial for various applications, including diagnostics.
  • Existing PCR methods may have limitations in sensitivity and automation for clinical use.

Purpose of the Study:

  • To develop and validate a highly sensitive PCR assay for detecting single DNA template molecules.
  • To assess the feasibility of using this assay for quantifying DNA in biological samples.
  • To explore the potential of this closed-tube system for automated clinical applications.

Main Methods:

  • Utilized a fluorescence energy transfer (TaqMan) assay to monitor PCR in 10 nl volumes within glass microcapillaries.

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  • Employed internally quenched probes that undergo template-dependent nucleolytic degradation, leading to increased fluorescence upon product formation.
  • Tested the assay with dilutions of genomic DNA to determine its limit of detection.

    • Main Results:

    • The TaqMan assay successfully detected single starting template molecules in genomic DNA dilutions.
    • Demonstrated that fluorescence increases upon successful PCR amplification due to probe degradation.
    • The assay system is closed and amenable to automation.

    Conclusions:

    • The developed PCR method offers high sensitivity, capable of detecting single DNA molecules.
    • Quantification of template molecules may be achievable by analyzing replicate PCR results from diluted samples.
    • The closed-tube, automatable nature of this assay holds significant potential for clinical diagnostics.