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Related Experiment Videos

Oligodeoxynucleotide-directed mutagenesis using the yeast transformation system.

R Y Walder, J A Walder

    Gene
    |January 1, 1986
    PubMed
    Summary

    This study presents an efficient site-specific mutagenesis method in yeast using single-stranded DNA. Synthetic oligonucleotides directly transformed into yeast achieved high mutation frequencies without in vitro enzymatic steps.

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    Area of Science:

    • Molecular Biology
    • Yeast Genetics

    Background:

    • Site-specific mutagenesis is crucial for genetic studies.
    • Yeast transformation with single-stranded DNA vectors offers a potential platform for mutagenesis.

    Purpose of the Study:

    • To develop and validate a highly efficient site-specific mutagenesis method in Saccharomyces cerevisiae.
    • To optimize the use of synthetic oligodeoxynucleotides for introducing specific mutations.

    Main Methods:

    • Utilized single-stranded circular DNA vectors derived from M13mp9 containing yeast genes (TRP1, URA3) and an ARS1 element for replication.
    • Annealed synthetic 5'-phosphorylated oligodeoxynucleotides (19 and 35 nt) to the ssDNA vector to introduce an A-T transversion mutation.
    • Directly transformed the heteroduplex DNA into yeast cells.

    Main Results:

    • Achieved 24% and 43% frequencies for the intended single nucleotide mutation using 19 nt and 35 nt oligonucleotides, respectively.
    • The 43% mutation frequency approached the theoretical maximum of 50%.
    • Oligonucleotides lacking a 5'-terminal phosphate reduced transformation and mutagenesis efficiency by 2-4 fold.

    Conclusions:

    • The described method provides a highly efficient, enzyme-free approach for site-specific mutagenesis in yeast.
    • Direct transformation of mutagenic oligodeoxynucleotides simplifies the mutagenesis procedure.
    • This technique enables direct phenotypic selection for mutated yeast genes.

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