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Mismatch Repair

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...

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A Rapid and Facile Pipeline for Generating Genomic Point Mutants in C. elegans Using CRISPR/Cas9 Ribonucleoproteins

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Generating Single Nucleotide Point Mutations in E. coli with the No-SCAR System.

Adam J Ellington¹, Christopher R Reisch²

¹Department of Microbiology and Cell Science, Institute of Food and Agricultural Science, University of Florida, Gainesville, FL, USA.

Methods in Molecular Biology (Clifton, N.J.)

|May 18, 2022

Summary

This study introduces a novel method for precise gene editing in E. coli using λ-Red recombineering and CRISPR/Cas9. By transiently inhibiting the mismatch repair (MMR) system, the efficiency of generating single nucleotide point mutations is significantly improved.

Keywords:

Cas9 Genome editing Mismatch repair No-SCAR Recombineering mutL

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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

Published on: March 16, 2011

Area of Science:

Microbiology
Molecular Biology
Biotechnology

Background:

Genetic manipulation is crucial for biological research and biotechnology.
λ-Red recombineering in E. coli is a widely used gene-editing technique.
Existing methods face challenges in efficiently generating point mutations due to DNA repair mechanisms.

Purpose of the Study:

To develop an improved gene-editing system for E. coli.
To enhance the efficiency of generating site-specific point mutations.
To minimize off-target mutations during genetic manipulation.

Main Methods:

The study combines λ-Red recombineering with CRISPR/Cas9 technology.
A novel plasmid, pCas9CyMutL, allows independent, inducible control of Cas9 and a mismatch repair (MMR)-inhibiting MutL variant.
Transient inhibition of MMR is achieved using anhydrotetracycline- and cumate-inducible promoters.

Main Results:

The developed method significantly improves the efficiency of generating single nucleotide point mutations.
Selective MMR inhibition ensures mutations are permanently incorporated after replication.
Minimizing MMR activity reduces the accumulation of off-target mutations.

Conclusions:

This approach offers a robust and efficient strategy for precise genetic engineering in E. coli.
The method enhances the reliability of gene editing for both research and biotechnological applications.
Transient MMR inhibition is key to achieving high-fidelity point mutations.