Extension Time In Pcr In Wake
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The inverse fusion PCR was run by using Phusion DNA-polymerase (0.02 units µl−1) under the following conditions: 98°C for 3 min, 25 cycles of 98°C – 20 s, 58°C – 30 s, 72°C – 30 s kb−1 and a final extension step at 72°C for 7 min.
Duration of extension will be dependent upon amplicon size (30 sec per 1 kb). The period of elongation depends upon the desired length of the amplicon and the enzyme used. Since qPCR amplicons are short, this is typically 5–30 sec.
The extension time of PCR depends upon the synthesis rate of DNA polymerase and the length of target DNA. The typical extension time for Taq DNA Polymerase is 1 min/kb, whereas that of Pfu DNA polymerase is 2 min/kb.
An extension time that is too short may fail to produce any amplification products or may result in non- specific, short products, while overly long extension times can causes diffusely smeared electrophoresis bands.
A typical PCR cycle includes an extension step at 72°C after denaturation of double-stranded DNA and annealing of oligonucleotide primers. At this temperature the thermostable poly-merase replicates the DNA at an optimal rate that depends on the buffer and nature of the DNA template ( 1 ).
Step : 3 Extension Generally, the reaction mixture is heated to a temperature intermediate between denaturation and annealing at this stage. 72°C is the ideal temperature for Taq polymerase. The polymerase extends the primers from 5' to 3'.
Extension is achieved by using the loosened nucleotides of each base to grow the complementary DNA strand. The end result is two double-stranded products of DNA. The temperature that is used during the extension phase is dependent on the DNA polymerase that is used.
Extension is achieved by using the loosened nucleotides of each base to grow the complementary DNA strand. The end result is two double-stranded products of DNA. The temperature that is used during the extension phase is dependent on the DNA polymerase that is used.
The final stage is the extension step (20 sec to 1 min at 72 °C), which is performed so that the DNA polymerase extends the primer sequences from the 3' of each primer to the end of the amplicon. A 1 min extension is typically sufficient to synthesize PCR fragments up to 2 kilobases (kb).
