A rapid and efficient one-step site-directed deletion, insertion, and substitution mutagenesis protocol

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Site-directed mutagenesis (SDM) is crucial for genetic engineering and structure-function studies.
• Existing PCR-based SDM methods can be limited by primer dimerization and require multiple steps.

Purpose of the Study:

• To develop a rapid and efficient SDM protocol.
• To introduce deletions, substitutions, and insertions into target genes.
• To improve mutation efficiency and reduce procedural complexity.

Main Methods:

• Utilized two separate polymerase chain reaction (PCR) amplifications.
• Employed homologous recombination in Escherichia coli for DNA fragment ligation.
• Used the target gene's genome directly as a template, eliminating the need for DpnI digestion.

Main Results:

• Achieved nearly 100% mutation frequencies for deletion, substitution, and insertion in the PEP4 gene of Saccharomyces cerevisiae.
• Significantly prevented primer dimerization compared to previous PCR-based SDM methods.
• Completed all procedures within 24 hours.

Conclusions:

• The described SDM protocol is rapid, efficient, and versatile for various gene modifications.
• This method facilitates high-throughput genetic engineering and structure-function analyses.
• The protocol is a valuable tool for molecular biology research.