CRISPR/Cas9-based gene targeting using synthetic guide RNAs enables robust cell biological analyses.

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Traditional RNA interference (RNAi) for gene silencing has limitations including off-target effects and incomplete protein depletion.
• CRISPR/Cas9 gene editing offers powerful gene knockout capabilities but is underutilized for visual phenotypic analyses, especially for essential genes requiring conditional depletion.

Purpose of the Study:

• To assess the efficacy of synthetic guide RNA transfection for gene product elimination in human cells.
• To provide a streamlined and robust method for CRISPR/Cas9-mediated functional studies.

Main Methods:

• Transfection of synthetic single guide RNA (sgRNA) and CRISPR RNA (crRNA) into human cells.
• Evaluation of protein depletion for three target genes (KIF11, CENPN, RELA).
• Comparison with lentiviral-delivered RNA guides and assessment of reverse transfection.

Main Results:

• Synthetic sgRNA and crRNA transfection achieved comparable protein depletion to stable lentiviral-delivered RNA guides.
• Synthetic sgRNAs can be effectively introduced via reverse transfection in an array format.
• Demonstrated efficacy across three distinct gene targets.

Conclusions:

• Synthetic guide RNA transfection is an effective and efficient strategy for gene product elimination in cell biological studies.
• These methods offer a robust, flexible, and scalable approach for functional genomics and phenotypic analysis using CRISPR/Cas9.
• Facilitates broader application of CRISPR/Cas9 for studying essential genes and complex cellular processes.