Extension Time In Pcr In San Antonio
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Polymerase chain reaction (PCR) is a method widely used in molecular biology to make many copies of a specific DNA segment. Using PCR, a single copy (or more) of a DNA sequence is exponentially amplified to generate thousands to millions of more copies of that particular DNA segment.
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.
Amplification is achieved by a series of three steps: (1) denaturation, in which double-stranded DNA templates are heated to separate the strands; (2) annealing, in which short DNA molecules called primers bind to flanking regions of the target DNA; and (3) extension, in which DNA polymerase extends the 3′ end of each ...
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.
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 ).
A 1 min extension is typically sufficient to synthesize PCR fragments up to 2 kilobases (kb). To amplify larger fragments, the elongation step is extended at a rate of 1 min per kb. During the first extension, the template will not be length limiting and so templates will be synthesized that exceed the amplicon length.
If the extension time is too short, there will be insufficient time for complete replication of the target. Generally, use an extension time of 1 min/kb. If the annealing time is too short, primers do not have enough time to bind to the template. Use an annealing time of at least 30 sec.
Excessive extension time can allow nonspecific amplification. Generally, use an extension time of 1 min/kb. Excessive annealing time may increase spurious priming. Use an annealing time of 30 sec.
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'.
RT-PCR Protocol Experiment process. (1) Primer design. Design and synthesize the primers of the target gene. (2) RNA extraction. (3) Reverse transcription(RNA→cDNA) ... (4) Real-time PCR. (5) Result analysis. The factors affecting Real-time PCR results.
