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Rapid and reliable site directed mutagenesis using Kunkel's approach
1Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore, India.
Indian Journal of Biochemistry & Biophysics
|October 1, 1998
Summary
This study enhances site-directed mutagenesis (SDM) by modifying the Kunkel method. The improved technique increases mutagenesis efficiency, allowing direct DNA sequencing of mutants and reducing background.
Area of Science:
- Molecular Biology
- Genetic Engineering
Background:
- Site-directed mutagenesis (SDM) is crucial for genetic modification.
- The Kunkel method is cost-effective but suffers from low efficiency due to parent template carryover.
Purpose of the Study:
- To improve the efficiency of the Kunkel method for site-directed mutagenesis.
- To develop a more cost-effective and faster SDM protocol.
Main Methods:
- Modification of the Kunkel method using Sequenase for extension.
- Introduction of an in vitro Uracil DNA Glycosylase (UDG) step to eliminate the parent template strand.
- Development of a single-tube protocol.
Main Results:
- Enhanced selection against the wild-type template strand.
- Increased mutagenesis efficiency, enabling direct screening of mutants via DNA sequencing.
- Protocol completion in under three hours.
Conclusions:
- The modified Kunkel method offers a significant improvement in efficiency and speed.
- This optimized protocol is ideal for cost-effective and rapid site-directed mutagenesis.
- Direct DNA sequencing of mutants simplifies downstream analysis.