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Highly improved cloning efficiency for plasmid-based CRISPR knock-in in C. elegans.

Ella DeMott1, Daniel J Dickinson2, Ryan Doonan1

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Plasmid-based CRISPR knock-in for C. elegans is efficient. New methods achieve 90% cloning efficiency using self-excising cassette plasmids, overcoming previous limitations.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Plasmid-based CRISPR knock-in is a scalable method for generating fluorescent protein tags in C. elegans.
  • Cloning has been a noted drawback compared to newer Cas9/RNP and linear DNA repair template protocols.
  • Previous methods required extensive cloning steps, limiting the practicality of plasmid-based approaches.

Purpose of the Study:

  • To quantitatively assess and improve the cloning efficiency of plasmid-based CRISPR knock-in.
  • To address the cloning burden associated with plasmid-based CRISPR knock-in methods.
  • To enhance the versatility and scalability of generating fluorescent protein tags in C. elegans.

Main Methods:

  • Utilized plasmid-based CRISPR knock-in with a self-excising cassette (SEC) selection system.
  • Performed thorough quantitative assessment of cloning efficiency.
  • Compared plasmid-based methods with contemporary Cas9/RNP and linear DNA repair template protocols.

Main Results:

  • Achieved reproducible cloning efficiencies of up to 90% for SEC selection plasmids.
  • Demonstrated that cloning is no longer a significant burden for plasmid-based CRISPR knock-in.
  • Validated the efficiency of the SEC method for streamlining the knock-in process.

Conclusions:

  • The self-excising cassette method significantly enhances cloning efficiency in plasmid-based CRISPR knock-in.
  • This improvement resolves the cloning bottleneck, making plasmid-based CRISPR knock-in a more attractive option.
  • The streamlined approach increases the scalability and versatility of generating tagged C. elegans strains.