Abstract
Acquisition of flanking sequence adjacent to a known DNA site is an important task in microbial genome-related research. In this study, we developed a new method containing two rounds of PCR followed by cloning and sequencing. Firstly, specific primer (SP) is added into the reaction system for primary locus-specific linear amplification, and then a complex long primer (CLP) is added into the cooled reaction system for only one cycle. Amplification products from the first round of PCR are directly purified without electrophoresis, diluted, and used as the templates of the second PCR. Secondly, one long specific primer (LSP) and one long base-fixed primer (LFP) are adopted. The amplicons are purified for cloning and sequencing. The achievement of specific amplification for long flanking region mainly depends on ingenious and precise settings of PCR programs, structure design of CLP primer, adding of CLP primer after specific linear amplification, concentration ratio of CLP and SP primer, applying long primers, etc. Through this method, we successfully performed the long PCR walkings (>1.5 Kb) on rpoB gene of Vibrio vulnificus, transposon-like gene of V. alginolyticus, and sto gene of V. cholerae. The method provides a robust and simple strategy for rapid amplification of long unknown DNA fragments from microbes.
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This study was supported by the National Basic Research Programme of China (2006CB101803) and the Natural Science Fund of China (30700016 and 31070106).
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Luo, P., Su, T., Hu, C. et al. A Novel and Simple PCR Walking Method for Rapid Acquisition of Long DNA Sequence Flanking a Known Site in Microbial Genome. Mol Biotechnol 47, 220–228 (2011). https://doi.org/10.1007/s12033-010-9332-z
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DOI: https://doi.org/10.1007/s12033-010-9332-z