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Genomic Promoter Shuffling by Using Recyclable Cassettes.

Xuelei Tian1,2, Wenqing Zhang1, Wei Xiao3,4

  • 1College of Life Sciences, Capital Normal University, Beijing, China.

Methods in Molecular Biology (Clifton, N.J.)
|September 5, 2020
PubMed
Summary

This study introduces a novel genetic element shuffling method for Saccharomyces cerevisiae. This technique allows for repeated genome manipulation and efficient promoter integration, overcoming limitations of previous methods.

Keywords:
5-FOAHomologous recombinationPromoter shufflingRecyclable cassettesSaccharomyces cerevisiae

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Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Synthetic Biology

Background:

  • Homologous recombination is used to introduce genetic elements into Saccharomyces cerevisiae.
  • Current methods using selectable markers limit genome manipulation and promoter integration.
  • Counterselectable markers like URA3 allow for removal but leave unwanted repeats.

Purpose of the Study:

  • To develop an improved method for genetic element shuffling in Saccharomyces cerevisiae.
  • To enable efficient and repeatable integration of genetic elements, including promoters.
  • To overcome the limitations of existing yeast genome manipulation techniques.

Main Methods:

  • Utilizing a counterselectable gene (URA3) flanked by tandem repeats of promoter elements.
  • Integration of the construct into the target locus via homologous recombination.
  • Induction of internal recombination to excise the counterselectable gene and one repeat copy.

Main Results:

  • Successful integration and subsequent excision of the URA3 gene and one promoter repeat.
  • Demonstration of a single promoter copy remaining functional at the target locus.
  • Facilitation of repeated genome manipulation and promoter shuffling.

Conclusions:

  • The described genetic element shuffling method provides a versatile tool for yeast genome engineering.
  • This approach enables efficient promoter integration and facilitates repeated genetic modifications.
  • The method overcomes previous limitations, offering enhanced flexibility for Saccharomyces cerevisiae research.