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TaqMan
TaqMan probes are hydrolysis probes that are designed to increase the specificity of quantitative PCR. The method was first reported in 1991 by researchers at Cetus Corporation, and the technology was subsequently developed by Roche Molecular Diagnostics for diagnostic assays and by Applied Biosystems for research applications.
The TaqMan probe principle relies on the 5´–3´ exonuclease activity of ''Taq'' polymerase to cleave a dual-labeled probe during hybridization to the complementary target sequence and fluorophore-based detection.〔(TaqMan Gene Expression - NCBI Projects )〕 As in other quantitative PCR methods, the resulting fluorescence signal permits quantitative measurements of the accumulation of the product during the exponential stages of the PCR; however, the TaqMan probe significantly increases the specificity of the detection. TaqMan probes were named after the videogame Pac-Man (''Taq'' Polymerase + PacMan = TaqMan) as its mechanism is based on the Pac-Man principle.〔(The Real-Time TaqMan PCR and Applications in Veterinary Medicine - From PacMan to TaqMan - a computer game revisited )〕
==Principle==
TaqMan probes consist of a fluorophore covalently attached to the 5’-end of the oligonucleotide probe and a quencher at the 3’-end〔(TaqMan Probes: Introduction, functioning and applications )〕 (Figure 1). Several different fluorophores (e.g. 6-carboxyfluorescein, acronym: ''FAM'', or tetrachlorofluorescein, acronym: TET) and ''quenchers'' (e.g. tetramethylrhodamine, acronym: TAMRA) are available. The quencher molecule quenches the fluorescence emitted by the fluorophore when excited by the cycler’s light source via FRET (Fluorescence Resonance Energy Transfer). As long as the fluorophore and the quencher are in proximity, quenching inhibits any fluorescence signals (Figure 1).
TaqMan probes are designed such that they anneal within a DNA region amplified by a specific set of primers. (Unlike the diagram, the probe binds to single stranded DNA.) As the ''Taq'' polymerase extends the primer and synthesizes the nascent strand (again, on a single-strand template, but in the direction opposite to that shown in the diagram, i.e. from 3' to 5' of the complementary strand), the 5' to 3' exonuclease activity of the ''Taq'' polymerase degrades the probe that has annealed to the template. Degradation of the probe releases the fluorophore from it and breaks the close proximity to the quencher, thus relieving the quenching effect and allowing fluorescence of the fluorophore. Hence, fluorescence detected in the quantitative PCR thermal cycler is directly proportional to the fluorophore released and the amount of DNA template present in the PCR.
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