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Site-directed deletion mutagenesis using phagemid vectors and genetic selection
L M Wang1, D K Geihl, G G Choudhury
1University of Texas, Health Science Center.
Biotechniques
|October 1, 1989
Summary
This study introduces a method for creating large deletions in cDNAs using Kunkel mutagenesis and genetic selection. This technique achieves high efficiency for deletion mutagenesis, simplifying the screening of desired clones.
Area of Science:
- Molecular Biology
- Genetic Engineering
- Biotechnology
Background:
- Site-specific mutagenesis is crucial for understanding gene function.
- Introducing large deletions in cDNA can be challenging and inefficient.
- Existing methods often result in a high frequency of aberrant clones, complicating screening.
Purpose of the Study:
- To develop an efficient method for generating large, site-specific deletions in cDNAs.
- To optimize the screening process for deletion mutants.
- To compare the efficiency of deletion mutagenesis with and without genetic selection.
Main Methods:
- Oligonucleotide-directed mutagenesis combined with the Kunkel method (dut/ung genetic selection).
- Introduction of large deletions into cDNAs cloned into phagemid vectors.
- Utilizing E. coli strain DH5 alpha for genetic selection of deletion mutants.
Main Results:
- Achieved high efficiency for large deletion mutagenesis, comparable to single point mutations.
- Observed a very low frequency of aberrant clones using the genetic selection method.
- Demonstrated that genetic selection significantly facilitates the screening of deletion mutants compared to random screening.
Conclusions:
- The described method provides an efficient and reliable way to construct site-specific deletion mutants in cDNAs.
- Genetic selection using E. coli DH5 alpha is effective in simplifying the identification of deletion clones.
- This approach serves as a valuable guide for researchers aiming to create deletion mutants.