[Real time PCR methodology for quantification of nucleic acids]
- PMID: 12805005
[Real time PCR methodology for quantification of nucleic acids]
Abstract
The polymerase chain reaction (PCR) has become an essential tool for molecular biologists and its introduction into nucleic acids detection systems has revolutionized the quantitative analysis of DNA and RNA. The technique has rapidly evolved over the last few years and the growing interest in quantitative applications of the PCR has favoured the development of real-time quantitative PCR. In this paper, we review, after presentation of the theorical aspects of PCR, the basic principles of real-time PCR with the introduction of the concept of threshold cycle. More precisely, we describe the novel assay formats that greatly simplify the protocols used for the detection of specific nucleic acids. We focus on the actual four technologies that enable sequence detection in a closed tube and that are SYBR Green I, TaqMan probes, Hybridization probes and Molecular Beacon probes. We then discuss the different quantification strategies in real time PCR and compare the competiting instruments on the market. The most important real-time PCR applications in clinical biology are also described.
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