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Genome Editing in Mammalian Cell Lines using CRISPR-Cas
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Circular synthesized CRISPR/Cas gRNAs for functional interrogations in the coding and noncoding genome.

Martin Wegner1, Valentina Diehl1, Verena Bittl1,2

  • 1Institute of Biochemistry II, Goethe University Frankfurt - Medical Faculty, University Hospital, Frankfurt, Germany.

Elife
|March 7, 2019
PubMed
Summary

We developed a new CRISPR/Cas technology for rapid, cloning-free generation of diverse gene perturbation libraries. This method creates high-quality, bias-free guide RNA reagents for efficient genome-wide screening and discovery.

Keywords:
3Cs technologyCRISPR/CasDUBsDoxorubicincell biologygRNA librarygeneticsgenome-widegenomicshuman

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biotechnology

Background:

  • Current CRISPR/Cas technologies for generating gene perturbation reagents are time-consuming, involving multiple ligation and cloning steps.
  • Increasing guide RNA (gRNA) sequence diversity often leads to poor distribution and heterogeneous library quality.

Purpose of the Study:

  • To introduce a rapid, cloning-free mutagenesis technology for generating covalently-closed-circular-synthesized (3Cs) CRISPR/Cas gRNA reagents.
  • To decouple sequence diversity from sequence distribution, enabling high-quality, bias-free gene perturbation libraries.
  • To demonstrate the utility of 3Cs reagents for large-scale screening, including identifying factors related to doxorubicin resistance.

Main Methods:

  • Development of a novel cloning-free mutagenesis technology to produce 3Cs CRISPR/Cas gRNA reagents.
  • Application of 3Cs technology to target all human deubiquitinating enzymes (DUBs).
  • Construction of a comprehensive gRNA library for interrogating the human genome and identifying doxorubicin resistance-related elements.

Main Results:

  • The 3Cs technology efficiently generates CRISPR/Cas gRNA reagents with uncoupled sequence diversity and distribution.
  • Demonstrated the fidelity and performance of 3Cs reagents by targeting human DUBs and confirming their essentiality for cell fitness.
  • Successfully generated a large-scale, bias-free gRNA library for high-content screening.

Conclusions:

  • The 3Cs technology offers a rapid and robust method for generating diverse, bias-free gene perturbation libraries.
  • This novel approach overcomes limitations of existing CRISPR/Cas reagent generation methods.
  • 3Cs technology represents a significant advancement for high-content screening and genomic research.