On/off switch mediated by Exo+ polymerases: experimental analysis for its physiological and technological implications |
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Authors: | Zhang Jia Chen Lin-Ling Guo Zi-Fen Peng Cui-Ying Liao Duan-Fang Li Kai |
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Institution: | Genomapping Inc., Tianjin, China. |
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Abstract: | The potential physiological role and technological application of the premature termination of DNA polymerization through the off-switch of exo+ polymerases were studied using 3' phosphorothioate-modified or unmodified primers with single base mismatch distal to the 3' terminus. With exonuclease-digestible unmodified primers, a gradient premature termination of DNA polymerization was observed when amplified with exo+ polymerases. With 3' allele specific phosphorothioate-modified primers, an efficient off-switch effect occurred in the discrimination of a single nucleotide polymorphism when directly using genomic DNA. Clearly, the off-switch of exo+ polymerases is useful in biomedical research. |
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