CRISPR-Cas9-Guided Genome Engineering in Caenorhabditis elegans

Area of Science:

• Molecular Biology
• Genetics
• Developmental Biology

Background:

• The CRISPR-Cas9 system enables efficient and targeted genome editing across diverse organisms.
• CRISPR-Cas9 approaches enhance genome engineering by utilizing DNA double-strand break repair pathways.
• Caenorhabditis elegans is a key model organism for genetic studies.

Purpose of the Study:

• To describe a comprehensive protocol for Cas9-mediated genome editing in C. elegans.
• To detail methods for single guide RNA (sgRNA) and repair template cloning.
• To outline germline injection techniques for delivering CRISPR-Cas9 components.

Main Methods:

• Preparation of guide RNA (sgRNA) and repair templates for homologous recombination.
• Cloning of sgRNA using fusion PCR and preparation of repair template donors for cassette selection.
• Germline injection of Cas9, sgRNAs, and repair template DNA into C. elegans.

Main Results:

• Successful implementation of Cas9-mediated genome editing in C. elegans.
• Demonstration of both marker-free and cassette selection methods for screening transgenic worms.
• Detailed protocols for all essential steps, from reagent preparation to animal screening.

Conclusions:

• This protocol provides a robust framework for CRISPR-Cas9 genome editing in C. elegans.
• The described methods facilitate efficient genetic modification for research purposes.
• The study offers practical guidance for researchers utilizing CRISPR-Cas9 in C. elegans.