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Deaminase-mediated multiplex genome editing in Escherichia coli
Satomi Banno1, Keiji Nishida2, Takayuki Arazoe1,3
1Graduate School of Science, Technology and Innovation, Kobe University, Kobe, Hyogo, Japan.
Nature Microbiology
|February 7, 2018
Summary
This study introduces Target-AID, a novel genome editing tool for bacteria. It enables precise point mutations in bacteria without harming cell growth, facilitating multiplex gene editing.
Area of Science:
- Molecular Biology
- Microbiology
- Genome Engineering
Background:
- CRISPR-Cas9 is widely used in eukaryotes but limited in prokaryotes due to lethality.
- Previous prokaryotic genome editing relied on negative selection, hindering efficiency.
Discussion:
- Target-AID utilizes a cytidine deaminase fused to a nuclease-deficient CRISPR-Cas9 system for targeted nucleotide editing in E. coli.
- This system induces specific cytosine to thymine mutations without compromising cell viability.
- Mutation efficiency is enhanced by combining a uracil DNA glycosylase inhibitor with an LVA degradation tag.
Key Insights:
- Achieved specific point mutagenesis in E. coli via deaminase-mediated editing.
- Demonstrated simultaneous multiplex editing of six genes and major multi-copy transposase genes.
- Mutation patterns are predictable and can be modulated by single guide RNA length.
Outlook:
- Target-AID offers a robust and efficient genome editing solution for bacteria.
- The system's independence from host-specific factors suggests broad applicability across bacterial species.
- Potential for advancing genetic manipulation and synthetic biology in prokaryotes.
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