The CAPZA1 Knockout HAP1 Polyclonal Cells product provides a CRISPR/Cas9-edited polyclonal knockout cell population generated in the HAP1 near-haploid human cell line, in which the CAPZA1 gene has been disrupted. This pool of edited cells offers a loss-of-function model for studying actin cytoskeleton dynamics, cell migration, and adhesion without the need for single-cell cloning. The polyclonal format captures a range of genetic modifications, enabling robust representation of the knockout phenotype.
The HAP1 cell line is a near-haploid, TP53 knockout, BCR-ABL negative derivative of the chronic myeloid leukemia KBM-7 cells, exhibiting fibroblast-like morphology. Its haploid genome??except for a disomic chromosome 15 region??enables unambiguous genotype?Cphenotype relationships and simplifies CRISPR-based editing, establishing HAP1 as a widely adopted model in functional genomics and targeted knockout screens. The line??s active proliferation and compatibility with transfection, lentiviral transduction, and automated imaging systems further enhance its utility.
CAPZA1 encodes the alpha subunit of the heterodimeric capping protein (CAPZA1/CAPZB) that binds the barbed ends of actin filaments to inhibit both monomer addition and dissociation, thereby controlling filament length and stability. CAPZA1 activity is regulated by phosphatidylinositol 4,5-bisphosphate (PIP2) and by CARMIL family proteins (CARMIL1, CARMIL2), which locally uncap filaments to enable site-directed actin polymerization. This release of capping is critical for processes such as Rac1 GTPase-driven lamellipodia protrusion, focal adhesion dynamics, and VASP-mediated filament elongation. Additional interactors including CD2AP and V-1/myotrophin further modulate the capping complex. Consequently, CAPZA1 sits at a hub linking PI3K/AKT and Rac1 signaling to cytoskeletal reorganization, influencing cell migration speed, adhesion strength, and mechanotransduction.
Disruption of CAPZA1 in HAP1 cells creates a polyclonal model in which the interplay between actin capping and uncapping is perturbed, allowing researchers to examine how loss of capping protein alters Rac1-dependent lamellipodia formation, focal adhesion turnover, and overall migratory behavior. Given the HAP1 line??s robust growth, ease of transfection, and suitability for high?content imaging, these knockout cells are particularly amenable to studying cytoskeletal phenotypes in a controlled genetic background. The near?haploid nature further supports screens for synthetic lethal interactions or chemical suppressors targeting actin?dependent processes relevant to cancer invasion and immune cell function.
Typical experimental applications include western blotting and RT-qPCR to confirm CAPZA1 depletion, immunofluorescence staining of F?actin to visualize stress fibers and lamellipodia, scratch wound and transwell invasion assays to quantify migration, and live?cell imaging for real?time actin dynamics. Co?immunoprecipitation studies can assess CAPZB interactions, while phospho?Rac1 assays probe upstream signaling. The polyclonal format avoids clonal biases, making it suitable for pooled functional screens and for generating stable knockout populations for drug sensitivity assays targeting actin regulators. These CAPZA1 Knockout HAP1 Polyclonal Cells are a versatile tool for investigating cytoskeletal control in metastasis, autoimmunity, and myopathies. For ordering or technical support, please contact Ascent Research.
