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Why is Agarose gel purification mandatory for direct sequencing of PCR products?
If gel purification is not performed and only a purification kit is used, it often leads to double peaks or messy peaks in the sequencing results. This is mainly caused by non-specific amplification products or incomplete removal of the original PCR primers. Most so-called PCR "purification kits" primarily recover the product but do not effectively purify it. They certainly cannot remove non-specific amplification products, and often they do not completely remove all PCR primers. These residual primers can participate in the sequencing reaction, causing messy peaks.
What are the requirements for direct sequencing of PCR products?
(1) The amplification product must be specific, with a single band. If non-specific amplification products are present, it is generally difficult to obtain good sequencing results.
(2) Gel extraction and purification must be performed.
(3) DNA purity (A260/A280) should be between 1.6–2.0, with a concentration ≥ 50 ng/µL.