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Species Identification: Minimal probes with Optimal primers
SYBR® Green is the most widely used double-strand DNA-specific dye reported for real time PCR. SYBR® Green binds to the minor groove of the DNA double helix. In the solution , the unbound dye exhibits very little fluorescence. This fluorescence is substantially enhanced when the dye is bound to double stranded DNA. SYBR® Green remains stable under PCR conditions and the optical filter of the thermocycler can be affixed to harmonize the excitation and emission wavelengths. Ethidium bromide can also be used for detection but its carcinogenic nature renders its use restrictive.
Species Identification
Using AlleleID®, you can design assays for identifying species and strains from a mix of sequences
Limitations of End-point PCR
In a PCR reaction as the reaction progresses, the reagents are being consumed as a result of amplification. Now the PCR product is no longer being doubled at each cycle due to this reagent constraint. This depletion will occur at different rates for each replicate. Thus, the samples begin to diverge in their quantities. This diminished amplification is the linear phase of the reaction. The plateau for each tube will differ due to the different reaction kinetics for each sample. It is in this phase where traditional PCR takes its measurement, also known as the end-point. This End-Point Detection has some problems such as low resolution, poor precision, low sensitivity and the need for post PCR processing. Also, the results of this detection are not expressed in numbers and there is no scope for automation.
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