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Related Concept Videos

CRISPR/Cas9 Genome Editing01:28

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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Large scale screening of CRISPR guide RNAs using an optimized high throughput robotics system.

J R Spangler1, T A Leski2, Z Schultzhaus3

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Summary

A new high-throughput screening method effectively evaluates CRISPR guide RNAs (crRNAs) for Cas13a collateral RNA cleavage. This approach optimizes crRNA design by identifying crucial factors like DNA oligomer source for improved efficacy.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genetics

Background:

  • CRISPR/Cas systems rely on CRISPR guide RNAs (crRNAs) for targeting specific genetic sequences.
  • crRNA design is complex, influenced by Cas protein type, target, and environmental factors.
  • Optimizing crRNA design is crucial for enhancing CRISPR/Cas system efficacy, particularly for Cas13a RNA targeting.

Purpose of the Study:

  • To develop and validate a high-throughput method for screening large numbers of candidate crRNAs for Cas13a activation.
  • To identify key factors influencing crRNA efficacy in Cas13a-mediated collateral RNA cleavage.
  • To establish a generalizable method for optimizing crRNA designs for Cas12 and Cas13 systems.

Main Methods:

  • A high-throughput screening platform was established to test hundreds of candidate crRNAs against a model target RNA (Y. pestis lcrV gene).
  • crRNAs targeting tiled regions of the gene transcript were synthesized and screened for their ability to activate Cas13a collateral activity.
  • Factors evaluated included crRNA/target sequence, size, secondary structures, and the commercial source of DNA oligomers used for crRNA synthesis.

Main Results:

  • Initial screening identified 271 out of 296 (91.5%) tested guide RNAs capable of detecting the target RNA.
  • Protocol optimization improved detection rates to 287 out of 296 (97%) guide RNAs.
  • crRNA efficacy was found to be significantly dependent on the source of DNA oligomers, rather than target region or crRNA physical properties.

Conclusions:

  • The developed high-throughput method enables efficient screening and optimization of crRNAs for Cas13a collateral RNA cleavage.
  • The source of DNA oligomers used for crRNA synthesis is a critical determinant of crRNA efficacy.
  • This screening approach has broad applicability for optimizing guide RNA designs in various CRISPR/Cas systems, including Cas12 and Cas13.