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Updated: Apr 25, 2026

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Selection of chromosomal DNA libraries using a multiplex CRISPR system.

Owen W Ryan1, Jeffrey M Skerker1, Matthew J Maurer1

  • 1Energy Biosciences Institute, University of California, Berkeley, Berkeley, United States.

Elife
|August 21, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a CRISPR-Cas9 system for efficient genome editing in yeast. This system accelerates the discovery of molecular determinants that enhance biomolecule function, increasing cellobiose fermentation rates over 10-fold.

Keywords:
CRISPRCas9S. cerevisiaebiophysicschromosomechromosomesdirected evolutiongenesgenome editingstructural biology

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Area of Science:

  • Synthetic biology
  • Biomolecular engineering
  • Molecular biology

Background:

  • Directed evolution of biomolecules is crucial for engineering and synthetic biology.
  • Current selection methods using plasmid expression or chromosomal integration have limitations like copy number variations and complex strategies.

Purpose of the Study:

  • To develop an efficient, marker-free genome editing system for rapid gene assembly and DNA library insertion in Saccharomyces cerevisiae.
  • To utilize this system for accelerating the selection of improved biomolecules and understanding their functional determinants.

Main Methods:

  • Optimized a single-step, marker-free CRISPR-Cas9 genome editing system for quantitative gene assembly and DNA library insertion.
  • Applied the Multiplex CRISPR (CRISPRm) system to select improved cellobiose utilization pathways in diploid yeast.

Main Results:

  • Achieved over 10-fold increase in cellobiose fermentation rates in a single round of mutagenesis and selection.
  • Identified synergistic mutations in cellodextrin transporters, revealing insights into substrate binding and transporter dynamics.

Conclusions:

  • The CRISPRm system significantly accelerates selection experiments for enhanced biomolecule function.
  • This technology facilitates the discovery of molecular determinants underlying improved biomolecule performance.