CRISPR/Cas9 screening using unique molecular identifiers.

Area of Science:

• Genomics
• Molecular Biology
• Biotechnology

Background:

• CRISPR/Cas9 gene knockout screens are vital for identifying genes involved in cellular functions.
• Pooled, lentiviral guide libraries are commonly used for systematic genetic screens.
• Reproducibility and accuracy in high-throughput screening remain critical challenges.

Purpose of the Study:

• To introduce Random Sequence Labels (RSLs) as unique molecular identifiers (UMIs) within CRISPR/Cas9 guide libraries.
• To enhance the precision, accuracy, and reproducibility of loss-of-function screens.
• To enable massively parallel lineage tracing and lineage dropout screening.

Main Methods:

• Incorporation of RSLs into pooled, lentiviral guide libraries for CRISPR/Cas9 screening.
• Utilizing RSLs as UMIs for high-throughput lineage tracing.
• Performing lineage dropout screens to identify genes affecting cellular phenotypes.

Main Results:

• RSLs significantly improve the reproducibility of CRISPR/Cas9 screens.
• The use of RSLs increases both the precision and accuracy of screening results.
• RSLs reduce the number of cells required for statistical power or enable more robust screens with existing cell numbers.

Conclusions:

• RSLs represent a significant advancement for CRISPR/Cas9-based loss-of-function screening.
• This UMI-based approach enhances the reliability and efficiency of identifying genes critical for cellular phenotypes.
• The method offers improved data quality and reduced experimental resource requirements.