This product is a CRISPR/Cas9-edited polyclonal knockout cell population in which the ARFGAP1 gene has been disrupted in the HAP1 host cell line. The polyclonal format provides a heterogeneous pool of cells carrying diverse loss-of-function alleles, enabling robust functional genomics studies without clonal bias. Researchers can employ this model to investigate ARFGAP1-dependent processes in a near-haploid genetic background, facilitating straightforward genotype?Cphenotype correlation in mammalian cells.
The host cell line, HAP1, is derived from the chronic myeloid leukemia (CML) KBM-7 cell line and exhibits a near-haploid karyotype with fibroblast-like adherent morphology. Its haploid nature simplifies genome editing and allows efficient disruption of single-copy genes, making it a widely adopted platform for genetic screening and functional dissection of human gene networks. HAP1 cells retain key signaling and trafficking pathways, providing a physiologically relevant context for studying the roles of ARFGAP1 in membrane dynamics and Golgi homeostasis.
ARFGAP1 functions as a GTPase-activating protein (GAP) for the small GTPase ARF1, catalyzing COPI vesicle coat disassembly at the Golgi membrane. This activity is regulated by membrane curvature and Src kinase-mediated phosphorylation, and it directly impacts the recruitment and release of coatomer proteins. Downstream, ARFGAP1 controls retrograde transport from the Golgi to the endoplasmic reticulum and maintains Golgi stack integrity through interactions with SNARE proteins, the KDEL receptor, and p23. Disruption of ARFGAP1 perturbs ARF1 GTPase cycling, leading to defective COPI vesicle uncoating and altered trafficking of Golgi enzymes and recycling receptors.
In the haploid HAP1 background, knockout of ARFGAP1 provides a clean loss-of-function model to dissect its role in Golgi architecture, COPI-mediated trafficking, and ARF1 signaling without interference from a second allele. This system is particularly valuable for high-resolution imaging of Golgi fragmentation, quantitative analysis of retrograde transport kinetics, and unbiased genetic modifier screens. The absence of ARFGAP1 in these cells can be used to assess compensatory pathways and to identify factors that restore proper Golgi function, aiding in the elucidation of disease mechanisms linked to Golgi dysfunction.
This knockout model is suited for a broad range of applications, including immunofluorescence microscopy using Golgi markers such as GM130 and giantin, western blotting to monitor ARF1 activation and coatomer association, and live-cell imaging to capture dynamic Golgi reorganization. It can also be employed in cancer research to study cell migration and invasion, where ARFGAP1 influences focal adhesion turnover and actin remodeling, and in drug discovery for screening modulators of ARF1 GTPase pathways. Further assays include co-immunoprecipitation of interacting factors, RT-qPCR analysis of trafficking-related transcripts, and functional complementation experiments. For additional details or custom services, please contact Ascent Research.
