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CRISPR/Cas9 Genome Editing

CRISPR/Cas9 Genome Editing

The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...

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Highly Efficient Gene Knockout in Medicago truncatula Genotype R108 Using CRISPR-Cas9 System and an Optimized

Tom Lawrenson¹, Nicola Atkinson², Macarena Forner²

¹John Innes Centre, Norwich, Norfolk, UK. tom.lawrenson@JIC.ac.uk.

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

|March 30, 2023

Summary

This study details a customizable CRISPR-Cas9 genome editing system for Medicago truncatula, enabling efficient generation of single or multiple gene knockout mutants for studying plant-microbe symbioses.

Keywords:

Agrobacterium CRISPR Cas9 Gene knockout Medicago Mutant R108 Transformation

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Published on: October 6, 2020

Area of Science:

Plant Biology
Molecular Genetics
Microbial Symbiosis

Background:

Medicago truncatula is a key model organism for legume symbiosis research.
Understanding gene function in symbiosis requires precise genetic tools like genome editing.
CRISPR-Cas9 technology offers a powerful approach for targeted gene modification.

Purpose of the Study:

To present a customizable CRISPR-Cas9 vector system for Medicago truncatula.
To enable efficient generation of single and multiple gene knockout mutants.
To facilitate the study of gene function in plant-microbe interactions.

Main Methods:

Utilizing Streptococcus pyogenes Cas9 (SpCas9) for targeted genome editing.
Customizing a vector system for single or multiplex gene targeting.
Generating transgenic Medicago truncatula plants with desired mutations.
Developing a strategy for obtaining transgene-free homozygous mutants.

Main Results:

Demonstrated the successful application of the SpCas9 system in Medicago truncatula.
Showcased the vector's flexibility for targeting one or multiple genes simultaneously.
Successfully produced transgenic plants with specific target site mutations.
Established a method for segregation of transgenes to achieve homozygous edited lines.

Conclusions:

The described CRISPR-Cas9 system provides a versatile and efficient tool for Medicago truncatula functional genomics.
This method aids in elucidating gene roles in nitrogen-fixing rhizobia and arbuscular mycorrhizal symbioses.
The ability to generate transgene-free mutants is crucial for accurate phenotypic analysis.