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Summary: Here, we present a protocol to perform CRISPR-Cas9 genome editing in human resting primary natural killer (NK) and NK-92 cells. We describe steps for guide RNA selection, ribonucleoprotein (RNP) complex formation, delivery via Nucleofection, and analysis of CRISPR edits to assess editing efficiencies. This protocol offers a tool for functional studies in NK cells, paving the way for potential applications in immunotherapy and beyond. We also discuss limitations such as off-target effects and cell-type-specific considerations. : Publisher’s note: Undertaking any experimental protocol requires adherence to local institutional guidelines for laboratory safety and ethics.