The ARPC1A Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal population designed for loss-of-function analysis of the ARPC1A gene. This model utilizes the HAP1 cell line and comprises a mixed pool of edited cells, providing a robust system for functional genomics studies without the constraints of clonal selection. The polyclonal format allows for bulk biochemical assays and pooled screens, capturing a representative range of knockout phenotypes.
HAP1 is a near-haploid human fibroblast-like cell line derived from the KBM-7 chronic myeloid leukemia (CML) model. Its near-haploid karyotype simplifies gene disruption, making it a widely used platform for knockout screening and functional genomics. HAP1 cells display characteristic adhesion and migration properties, rendering them suitable for investigating actin cytoskeleton dynamics and drug responses. This genetic background provides a consistent and reproducible context for evaluating the effects of ARPC1A loss.
The ARPC1A gene encodes the p41 subunit of the Arp2/3 complex, which nucleates branched actin filaments essential for lamellipodia protrusion, cell migration, endocytosis, and phagocytosis. Arp2/3 activation is mediated by nucleation-promoting factors including WAVE and WASP, which are regulated by the Rho GTPases Rac1 and Cdc42 and phosphoinositide PIP3. ARPC1A forms the structural core of the complex together with ARPC1B, ARPC2-5, and the ARP2/3 subunits, and it interacts with cortactin to stabilize actin branches. Disruption of ARPC1A impairs actin polymerization downstream of Rac1 and Cdc42, leading to defective lamellipodia formation, reduced focal adhesion turnover, and diminished endocytic and phagocytic capacity. Consequently, ARPC1A is integral to processes such as cancer cell invasion and immune synapse assembly.
In HAP1 cells, ARPC1A knockout profoundly alters actin-dependent functions. The normally active lamellipodial protrusions and rapid migration of these cells are severely compromised, manifesting as reduced F-actin content at the leading edge and slower motility. This model facilitates dissection of Rac1-to-Arp2/3 signaling and its contribution to CML-derived cell behavior. The polyclonal knockout population enables bulk phenotypic analyses, including fluorescence-based F-actin quantitation and migration rate measurements, offering statistical power for high-throughput studies. The near-haploid background further supports straightforward interpretation of single-allele disruption effects.
ARPC1A Knockout HAP1 Polyclonal Cells are ideal for a range of functional assays: immunofluorescence for F-actin using phalloidin, transwell migration and invasion assays, flow cytometry-based actin polymerization quantification, and phagocytosis assays. They also serve as a platform for screening cytoskeletal inhibitors targeting Arp2/3 or upstream regulators like the WAVE complex and Rac1. Applications extend to cancer metastasis research, where ARPC1A-driven motility contributes to dissemination, and to immunological studies examining immune cell functions. For more information, please contact Ascent Research.
