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Multiplex Detection of Bacteria in Complex Clinical and Environmental Samples using Oligonucleotide-coupled Fluorescent Microspheres
Published on: October 23, 2011
Multiplex-microsphere-quantitative polymerase chain reaction: nucleic acid amplification and detection on
Fang Liang1, Richard Lai, Neetika Arora
1School of Chemistry and Molecular Biosciences, Australian Infectious Diseases Research Centre, University of Queensland, St. Lucia, Queensland 4072, Australia.
Analytical Biochemistry
|September 25, 2012
Summary
A novel microsphere quantitative PCR system enables nucleic acid amplification monitoring. This method simplifies multiplexing for detecting multiple genes, offering an alternative to current real-time protocols.
Area of Science:
- Molecular Biology
- Biotechnology
- Analytical Chemistry
Background:
- Current real-time quantitative PCR (qPCR) protocols have limitations in multiplexing capabilities.
- Designing unique internal probes for each target gene in multiplex assays can be complex and time-consuming.
Purpose of the Study:
- To develop a new system for monitoring nucleic acid amplification on microspheres.
- To create a microsphere-based quantitative PCR (qPCR) system with enhanced multiplexing potential.
Main Methods:
- Development of a "universal" oligonucleotide-tagged forward primer for PCR.
- Design of a fluorescently labeled sensor sequence complementary to the universal primer sequence.
- Coupling of universal oligonucleotides to Luminex microspheres for detection.
- Performing PCR in the presence of microspheres, allowing binding of amplified products to the microspheres.
Main Results:
- Successful development and testing of a microsphere quantitative PCR system.
- Demonstrated ability to detect up to three different target genes (Neisseria meningitides porA and ctrA, influenza A M gene segment) in a single reaction tube.
- The system's analytical sensitivity was comparable to the TaqMan system.
- The microsphere qPCR system eliminates the need for unique internal probes for each target.
Conclusions:
- The developed multiplex-microsphere-quantitative PCR system offers a simplified approach to multiplex gene detection.
- This system has the potential for a high degree of multiplexing, exceeding current real-time qPCR limitations.
- The technology provides a flexible and efficient platform for molecular diagnostics and research.
