Genome-scale CRISPR screening at high sensitivity with an empirically designed sgRNA library

Area of Science:

• Genomics
• Molecular Biology
• Biotechnology

Background:

• CRISPR/Cas9 technology enables large-scale genetic screens for gene function analysis.
• Functional dependencies across coding and noncoding genomes are being explored in diverse cell types.
• Optimal design criteria for CRISPR screening are still developing.

Purpose of the Study:

• To establish optimal design criteria for genome-scale CRISPR screens.
• To improve the efficiency and specificity of gene essentiality screens.
• To develop a novel genome-scale sgRNA library for enhanced gene discovery.

Main Methods:

• Systematic analysis of published CRISPR screens in human cells.
• Identification and selection of single-guide RNAs (sgRNAs) with high on-target and low off-target activity.
• Development of a novel genome-scale sgRNA library using selected guides.
• Comparison of viability screens in Cas9 single-cell clones versus bulk populations.

Main Results:

• Viability screens in single-cell clones offer advantages over bulk populations.
• A novel genome-scale sgRNA library was created with high-performance sgRNAs.
• The library efficiently identifies both core and context-dependent essential genes.
• Empirically designed libraries with optimized experimental design enhance dynamic range in gene essentiality screens.

Conclusions:

• Optimized experimental design and empirically designed libraries increase the dynamic range of gene essentiality screens.
• The developed sgRNA library effectively identifies essential genes.
• Single-cell clone screening and carefully selected sgRNAs improve CRISPR screening outcomes.