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Updated: Sep 24, 2025

Pooled CRISPR-Based Genetic Screens in Mammalian Cells
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Comparative optimization of combinatorial CRISPR screens.

Ruitong Li1, Olaf Klingbeil2, Davide Monducci1

  • 1Broad Institute of Harvard and MIT, Cambridge, MA, USA.

Nature Communications
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Summary

Combinatorial CRISPR screens effectively identify gene interactions. Optimized Streptococcus pyogenes Cas9 (spCas9) systems with alternative tracrRNA sequences provide superior performance for multiplexed sgRNA delivery in digenic knockout screens.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Biotechnology

Background:

  • Combinatorial CRISPR technologies enable systematic probing of genetic interactions.
  • Multiplexing single-guide RNAs (sgRNAs) in CRISPR screens presents performance variability.
  • Understanding gene dependencies in redundant gene pairs requires robust functional genomic tools.

Purpose of the Study:

  • To benchmark and optimize pooled combinatorial CRISPR libraries for digenic knockout screens.
  • To evaluate the performance of different CRISPR-Cas systems and library designs for targeting paralog pairs.
  • To identify robust strategies for profiling genetic interactions of multiple genes.

Main Methods:

  • Generation and benchmarking of ten distinct pooled combinatorial CRISPR libraries.
  • Evaluation of libraries utilizing dual Streptococcus pyogenes Cas9 (spCas9), orthogonal spCas9 and Staphylococcus aureus (saCas9), and enhanced Cas12a.
  • Assessment of effect size and positional balance between sgRNAs in digenic knockout screens.

Main Results:

  • Significant performance variation observed across different functional genomic tools for multiplexing sgRNAs.
  • A combination of alternative tracrRNA sequences with spCas9 demonstrated superior effect size.
  • Optimized spCas9 libraries showed improved positional balance between sgRNAs, enhancing reliability.

Conclusions:

  • Alternative tracrRNA sequences in spCas9-based combinatorial CRISPR libraries offer a robust approach for genetic interaction profiling.
  • Optimized library design is crucial for enhancing the accuracy and efficiency of digenic knockout screens.
  • This work provides a foundation for systematic genetic interaction mapping using multiplexed CRISPR technologies.