期刊
BIOTECHNIQUES
卷 47, 期 4, 页码 857-863出版社
INFORMA HEALTHCARE
DOI: 10.2144/000113219
关键词
PCR chimera; template concentration; cycle number; gene family evolution; copy number
资金
- National Institutes of Health (NIH) [1R15GM081865-01]
- National Science Foundation [OCE-0648713, DEB 043115]
- Conselho Nacional de Pesquisa e Desenvolvimento, Brazil [GDE 200853/2007-4]
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R15GM081865] Funding Source: NIH RePORTER
PCR-mediated recombination can greatly impact estimates of diversity, both in environmental studies and in analyses of gene family evolution. Here we measure chimera (PCR-mediated recombinant) formation by analyzing a mixture of eight partial actin sequences isolated from the amoeba Arcella hemisphaerica amplified under a variety of conditions that mimic standard laboratory situations. We further compare a new-generation proofreading processivity-enhanced polymerase to both a standard proofreading enzyme and previously published results. Proofreading polymerases are preferred over other polymerases in instances where evolutionary inferences must be made. Our analyses reveal that reducing the initial template concentration is as critical as reducing the number of cycles for decreasing chimera formation and improving accuracy. Furthermore, assessing the efficiency of recovery of original haplotypes demonstrates that multiple PCR reactions are required to capture the actual genetic diversity of a sample. Finally, the experiments confirm that processivity-enhanced polymerases enable a substantial decrease in PCR-mediated recombination through reducing starting template concentration, without compromising the robustness of PCR reactions.
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