Extension Time In Pcr In San Diego
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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/Elongation Step The primers represent the starting point for the next step, called the extension step. During the extension, or elongation, step, Taq polymerase binds to each PCR primer and begins adding nucleotides. Note that Taq, like human DNA polymerase, can only add DNA nucleotides in one direction.
Use 20–35 cycles. Use fewer cycles when template concentration is high, and use more cycles when template concentration is low. 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.
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.
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'.
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.
Increase the annealing temperature to improve specificity. The optimal annealing temperature is usually no less than 3–5°C below the lowest primer Tm. Optimize the annealing temperature stepwise in 1–2°C increments, using a gradient cycler when available. Consider touchdown PCR to enhance specificity.
Extension Time Extensions are normally performed at 68°C. As a general rule, use extension times of one minute per 1000 base pairs (e.g. 3 minutes for a 3 kb product) For products less than 1 kb, use 45-60 seconds. Products greater than 3 kb, or reactions using more than 30 cycles, may require longer extensions.
Rapid PCR tests can provide results in as little as 1-2 hours, while traditional PCR tests can take up to 3 days. This faster turnaround time is crucial for people who may be infected with COVID, as it allows them to get treatment more quickly.
