Streamlined single shot safe harbor transgene integration in C. elegans using unc-119 rescue

Area of Science:

• Genetics
• Molecular Biology
• Developmental Biology

Background:

• Transgenic animals, particularly C. elegans, are crucial for genetic research.
• Current methods for multicopy transgene integration are time-consuming and can cause unwanted mutations.
• CRISPR/Cas9-based methods offer improved efficiency and reduced off-target effects.

Purpose of the Study:

• To streamline the generation of multicopy transgenes in C. elegans using the FLInt method.
• To develop a protocol utilizing unc-119 rescue as a phenotypic marker for transgene integration.
• To facilitate efficient and precise genome engineering at safe harbor loci.

Main Methods:

• CRISPR/Cas9-based transgene integration using Fluorescent Landmark Interference (FLInt).
• Development of C. elegans strains for FLInt-mediated integration.
• Utilizing unc-119 gene rescue as a selectable marker for transgenic animals.

Main Results:

• Successfully generated C. elegans strains for efficient FLInt-mediated multicopy transgene integration.
• Demonstrated the utility of unc-119 rescue for selecting transgenic animals.
• Established a streamlined protocol for integrating transgenes at safe harbor loci.

Conclusions:

• The developed protocol significantly enhances the efficiency of multicopy transgene generation in C. elegans.
• This method offers a safer alternative to DNA damaging agents, minimizing off-target mutations.
• The approach facilitates advanced genetic studies and genome engineering in C. elegans.