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        Overlap Extension PCR Cloning

        互联网

        1401
        Rising demand for recombinant proteins has motivated the development of efficient and reliable cloning methods. Here we show how a beginner can clone virtually any DNA insert into a plasmid of choice without the use of restriction endonucleases or T4 DNA ligase. Chimeric primers encoding plasmid sequence at the 5′ ends and insert sequence at the 3′ ends are designed and synthesized. Phusion DNA polymerase is utilized to amplify the desired insert by PCR. The double-stranded product is subsequently employed as a pair of mega-primers in a PCR-like reaction with circular plasmids. The original plasmids are then destroyed in restriction digests with Dpn I. The product of the overlap extension PCR is used to transform competent Escherichia coli cells. Phusion DNA polymerase is used for both the amplification and fusion reactions, so both steps can be monitored and optimized in the same way.
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