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Nucleic acid amplification strategies for DNA microarray-based pathogen detection.

Gary J Vora1, Carolyn E Meador, David A Stenger

  • 1Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375, USA. gvora@cbmse.nrl.navy.mil

Applied and Environmental Microbiology
|May 7, 2004
PubMed
Summary
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Random amplification methods offer unbiased pathogen detection for DNA microarrays, outperforming multiplex PCR in sensitivity and reducing amplification bias. These strategies are effective for environmental samples.

Area of Science:

  • Molecular Biology
  • Biotechnology
  • Environmental Science

Background:

  • DNA microarrays offer comprehensive screening but are limited by front-end nucleic acid amplification.
  • Polymerase Chain Reaction (PCR) amplification, while sensitive, introduces bias and limits throughput for microarray applications, particularly in pathogen detection.

Purpose of the Study:

  • To investigate alternative front-end amplification strategies for DNA microarray applications.
  • To compare the sensitivity, specificity, and amplification bias of random amplification methods versus multiplex PCR for pathogen detection.

Main Methods:

  • Evaluated four front-end amplification strategies: random primed, isothermal Klenow fragment-based, phi29 DNA polymerase-based, and multiplex PCR.
  • Assessed amplification utility by hybridizing amplicons to DNA microarrays with probes specific for enterohemorrhagic Escherichia coli O157:H7.

Related Experiment Videos

  • Quantitated detection sensitivities in laboratory and environmental samples.

    • Main Results:

    • Random amplification strategies, particularly tandem Klenow and phi29 polymerase-Klenow, showed higher sensitivity than multiplex PCR.
    • Random amplification methods exhibited significantly lower amplification bias (2- to 20-fold) compared to multiplex PCR (>4 orders of magnitude).
    • Random amplification successfully detected multiple targets in spiked environmental water samples with high levels of contaminating DNA.

    Conclusions:

    • Random amplification approaches are feasible and versatile for unbiased pathogen detection using DNA microarrays.
    • These methods overcome limitations of PCR, enabling more comprehensive and accurate analysis of environmental samples.