Limiting dilution PCR was an improvement over previous techniques,
such as competitive PCR, for quantification of PCR targets.
It was precise, had a wide dynamic range, and could detect and
quantify rare target molecules. However it had two disadvantages.
Firstly, it was an open system and had the potential for contamination
of the environment by amplified PCR product. Secondly, it was
a manual system and quite laborious. Our protocol was to perform
an initial series of PCRs involving three replicates at tenfold dilutions
of the sample in order to approximately determine the limit
of dilution and then to perform a definitive series of PCRs involving
5–10 replicates at each of a series of threefold dilutions around
the limit of dilution. The endpoint of all-or-none amplification was
assessed by electrophoresis
Limiting dilution PCR was an improvement over previous techniques,such as competitive PCR, for quantification of PCR targets.It was precise, had a wide dynamic range, and could detect andquantify rare target molecules. However it had two disadvantages.Firstly, it was an open system and had the potential for contaminationof the environment by amplified PCR product. Secondly, it wasa manual system and quite laborious. Our protocol was to performan initial series of PCRs involving three replicates at tenfold dilutionsof the sample in order to approximately determine the limitof dilution and then to perform a definitive series of PCRs involving5–10 replicates at each of a series of threefold dilutions aroundthe limit of dilution. The endpoint of all-or-none amplification wasassessed by electrophoresis
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