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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Related Experiment Video

Updated: Jun 3, 2025

Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening
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Optimizing Yeast Homologous Recombination for Splicing Large Coronavirus Genome Fragments.

Guoqing Xiong1,2, Xuan Huang1,2, Ao Hu1,2

  • 1Institutes of Physical Science and Information Technology, Anhui University, Hefei 230000, China.

International Journal of Molecular Sciences
|January 8, 2025
PubMed
Summary

This study demonstrates efficient splicing of large viral DNA fragments using yeast homologous recombination. Optimized parameters achieved up to 97.9% efficiency, simplifying coronavirus genome manipulation.

Keywords:
DNA assemblyautomated splicingreverse geneticssynthetic biologyyeast homologous recombination

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetic Engineering

Background:

  • Reverse genetics is crucial for coronavirus research and vaccine development.
  • Manipulating large and unstable coronavirus genomes in Escherichia coli presents significant challenges.
  • Homologous recombination is a fundamental mechanism for DNA manipulation, widely used in yeast for genetic engineering.

Purpose of the Study:

  • To develop a more efficient method for manipulating large viral genome fragments.
  • To adapt yeast homologous recombination technology for large DNA fragment manipulation in virology.
  • To optimize parameters for successful splicing of a 30 kb viral genome fragment.

Main Methods:

  • Utilized yeast homologous recombination in Saccharomyces cerevisiae to split and splice a 30 kb viral genome fragment.
  • Systematically optimized parameters including homologous arm lengths and fragment-to-vector ratios.
  • Evaluated splicing efficiency based on optimized conditions.

Main Results:

  • Successfully split and spliced a 30 kb viral genome fragment using yeast homologous recombination.
  • Achieved a maximum splicing efficiency of 97.9% through parameter optimization.
  • Identified optimal parameters: 60 bp homologous sequence length and a 1:2:2:2:2:2 vector fragment ratio.

Conclusions:

  • Yeast homologous recombination is an effective strategy for manipulating large viral DNA fragments.
  • Optimized homologous recombination protocols significantly enhance efficiency for complex genetic engineering tasks.
  • This method offers a promising alternative for constructing and manipulating coronavirus genomes.