Protein tagging with CRISPR-Cas9 enables the investigation of protein function in its native environment but is limited by low homology-directed repair (HDR) efficiency. Here, we present a protocol for fast antibiotic resistance-based gene editing with CRISPR-Cas9 (FAB-CRISPR), which streamlines N/C-terminal tagging using an antibiotic resistance cassette for rapid selection and enrichment of gene-edited cells. We describe in detail guide RNA and HDR donor plasmid cloning, transfection of editing reagents into HeLa cells, and subsequent enrichment and verification of gene-edited cells. For complete details on the use and execution of this protocol, please refer to Wong-Dilworth et al.,1 Stockhammer et al.,2 Stockhammer et al.,3 Heyza et al.,4 and Broadbent et al.5
