Applied Microbiology and Biotechnology

, Volume 73, Issue 1, pp 234–240

A direct and efficient PAGE-mediated overlap extension PCR method for gene multiple-site mutagenesis


DOI: 10.1007/s00253-006-0583-3

Cite this article as:
Peng, RH., Xiong, AS. & Yao, QH. Appl Microbiol Biotechnol (2006) 73: 234. doi:10.1007/s00253-006-0583-3


A simple, two-step efficient method to perform multiple-site mutagenesis of a gene from bacterial genome was developed. The method was named polyacrylamide gel electrophoresis (PAGE)-mediated overlap extension polymerase chain reaction (PCR) (POEP). The first step involves synthesis of individual fragments containing mutant sites with 15- to 25-bp overlap between two adjacent fragments. Mutations were introduced into the overlapping oligonucleotide primers which ensured the particular primer-template annealing. PAGE was used to remove contaminating parental templates, mispriming fragments, and leftover primers. The second step involves synthesis of the mutant full-length fragment. All purified PCR products from the first step were combined and used as the template for a second PCR using high-fidelity DNA polymerase, with the two outermost flanking oligonucleotides as primers. Using the POEP method, we have successfully introduced eight EcoRI sites into the Escherichia coli β-galactosidase (Lac Z) gene. The overall rate of obtaining the multiple mutant sites was 100%. The POEP method is simple, involving only two steps, and reliable for multiple-site mutagenesis and is promising to be widely used in gene modification.

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Shanghai Key Laboratory of Agricultural Genetics and Breeding, Agro-Biotechnology Research CenterShanghai Academy of Agricultural SciencesShanghaiPeople’s Republic of China

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