The ARPC5 Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the near-haploid HAP1 human fibroblast-like cell line. Through CRISPR/Cas9-mediated gene disruption, these cells carry targeted loss-of-function alterations in ARPC5, encoding a subunit of the Arp2/3 complex. The polyclonal nature yields a heterogeneous pool of edited alleles, establishing a consistent functional knockout across the population while avoiding clonal artifacts.
The HAP1 host cell line is a near-haploid fibroblast-like cell line derived from the KBM-7 chronic myeloid leukemia line. Its near-haploid karyotype, with a single allele for most genes, facilitates efficient gene disruption and minimizes compensatory mutations. HAP1 cells maintain key signaling and cytoskeletal architectures, serving as an established model for actin-dependent processes including migration, adhesion, and endocytosis. Their adherent growth and fibroblast morphology further support imaging-based and motility assays.
ARPC5 is a core subunit of the Arp2/3 complex, which initiates branched actin filament assembly essential for lamellipodia, cell motility, and endocytic trafficking. The complex is activated by nucleation-promoting factors WASP, N-WASP, and the WAVE complex, themselves downstream of Rho GTPases Rac1 and Cdc42. Cortactin stabilizes actin branch points, while profilin and cofilin regulate monomer delivery and filament disassembly. Disruption of ARPC5 cripples the complex’s ability to generate branched arrays, impairing focal adhesion turnover, lamellipodial protrusion, and vesicle scission.
Within the HAP1 background, ARPC5 knockout provides an unambiguous loss-of-function tool to probe Arp2/3-dependent processes. The near-haploid state ensures that the polyclonal population is functionally null for ARPC5, eliminating residual wild-type protein expression. This allows clean interpretation of phenotypes such as reduced migration velocity, defective cell spreading, and impaired endocytosis. The polyclonal composition additionally reflects the heterogeneity of natural cell populations, enhancing translational relevance for disease modeling.
This knockout cell product supports a range of experimental applications: Transwell migration assays to quantify motility deficits, immunofluorescence with phalloidin or anti-F-actin to visualize cytoskeletal organization, and live-cell imaging of actin dynamics. Co-immunoprecipitation can confirm the absence of ARPC5 from the Arp2/3 complex, while phagocytosis and endocytosis assays evaluate functional outcomes. The cells are also suitable for drug screens targeting the actin cytoskeleton or mapping genetic interactions. For further information, please contact Ascent Research.
