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Selectable marker replacement in Saccharomyces cerevisiae

M Vidal1, R F Gaber

  • 1Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, IL 60208.

Yeast (Chichester, England)
|February 1, 1994
PubMed
Summary
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Researchers developed a method to efficiently replace selectable markers in yeast using homologous plasmids. This technique simplifies the creation of yeast strains with multiple gene disruptions, advancing genetic engineering capabilities.

Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Genetic Engineering

Background:

  • Selectable markers are crucial for yeast genetic manipulation.
  • Existing methods for marker replacement can be inefficient or complex.
  • The 'gamma' deletion method facilitates initial marker integration.

Purpose of the Study:

  • To develop an efficient in vivo method for replacing selectable markers in yeast.
  • To streamline the generation of yeast strains with multiple gene disruptions.
  • To validate the use of homologous recombination for marker replacement.

Main Methods:

  • Transformation of yeast with homologous plasmids carrying alternate selectable markers.
  • Selection for transformants exhibiting loss of original prototrophy and gain of alternate prototrophy.

Related Experiment Videos

  • Molecular analysis to confirm homologous recombination at the target locus.

    • Main Results:

    • High transformation frequencies were achieved for marker replacement.
    • Molecular analysis confirmed homologous recombination as the mechanism.
    • The method successfully replaced original selectable markers with alternate ones.
    • No plasmid construction was required for the replacement process.

    Conclusions:

    • Homologous recombination with plasmids provides an efficient strategy for selectable marker replacement in yeast.
    • This technique significantly facilitates the construction of yeast strains with multiple gene disruptions.
    • The method offers a streamlined approach for yeast genetic engineering.