Multiplexed Guide RNA Expression Leads to Increased Mutation Frequency in Targeted Window Using a CRISPR-Guided...

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• CRISPR-Cas9 technology enables targeted DNA modification using guide RNAs (gRNAs).
• yEvolvR, an error-prone DNA polymerase guided by CRISPR, facilitates targeted nucleotide diversification.
• Investigating CRISPR-guided mutagenesis in Saccharomyces cerevisiae.

Discussion:

• Multiplexed expression of gRNAs flanking a DNA locus increases reversion frequencies.
• Synergistic effects of multiple gRNAs on mutation rates observed via next-generation sequencing.
• Enhanced mutagenesis in yeast mutants with impaired DNA mismatch repair.

Key Insights:

• Simultaneous expression of multiple gRNAs significantly boosts reversion frequencies.
• Multiple gRNAs exhibit a synergistic effect on mutation frequencies, amplified in mismatch repair-deficient strains.
• Galactose-inducible yEvolvR allows temporal control over mutagenesis.

Outlook:

• Optimizing CRISPR-guided mutagenesis for efficient in vivo genetic library construction.
• Potential applications in synthetic biology and metabolic engineering.
• Further exploration of DNA repair pathway interactions with CRISPR-based mutagenesis.