An improved PCR-based method for site directed mutagenesis using megaprimers
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Updated: Oct 26, 2026

Site-Directed Mutagenesis for In Vitro and In Vivo Experiments Exemplified with RNA Interactions in Escherichia Coli
Published on: February 5, 2019
J Brøns-Poulsen1, N E Petersen, M Hørder
1Department of Molecular Biology, Odense University, Odense, Denmark.
Abstract:
An improved protocol for site-directed mutagenesis based on the two-step polymerase chain reaction (PCR) megaprimer method is described. Compared to previously published protocols, the protocol described in this article ensures consistently a success rate of at least 85% with essentially no introduction of unwanted secondary mutations. The essential features of this protocol include an optimization of the template-primer amounts and ratio that allows the use of a reduced number of PCR cycles and the use of proof-reading thermostable DNA polymerases.

