Abstract
The polymerase chain reaction (PCR) is a powerful method for fast in vitro enzymatic amplifications of specific DNA sequences. PCR amplifications can be grouped into three different categories: standard PCR, long PCR, and multiplex PCR. Standard PCR involves amplification of a single DNA sequence that is less than 5 kb in length and is useful for a variety of applications, such as cycle sequencing, cloning, mutation detection, etc. Long PCR is used for the amplification of a single sequence that is longer than 5 kb and up to 40 kb in length. Its applications include long-range sequencing; amplification of complete genes; PCR-based detection and diagnosis of medically important large-gene insertions or deletions; molecular cloning; and assembly and production of larger recombinant constructions for PCR-based mutagenesis (1,2). The third category, multiplex PCR, is used for the amplification of multiple sequences that are less than 5 kb in length. Its applications include forensic studies; pathogen identification; linkage analysis; template quantitation; genetic disease diagnosis; and population genetics (3–5). Unfortunately, there is no single set of conditions that is optimal for all PCR. Therefore, each PCR is likely to require specific optimization for the template/primer pairs chosen. Lack of optimization often results in problems, such as no detectable PCR product or low efficiency amplification of the chosen template; the presence of nonspecific bands or smeary background; the formation of “primer-dimers” that compete with the chosen template/primer set for amplification; or mutations caused by errors in nucleotide incorporation.
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Grunenwald, H. (2003). Optimization of Polymerase Chain Reactions. In: Bartlett, J.M.S., Stirling, D. (eds) PCR Protocols. Methods in Molecular Biology™, vol 226. Humana Press. https://doi.org/10.1385/1-59259-384-4:89
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DOI: https://doi.org/10.1385/1-59259-384-4:89
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