The ASAP2 Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population originating from the HAP1 human near-haploid cell line. This model features disruption of the ASAP2 gene via CRISPR/Cas9-mediated gene disruption, yielding a heterogeneous pool of loss-of-function mutants. The polyclonal format avoids clonal artifacts and provides a robust system for studying ASAP2 function in a near-isogenic background.
HAP1 cells, derived from the KBM-7 chronic myeloid leukemia line, are an adherent, near-haploid human cell line extensively used for genetic screening and functional genomics. Their near-haploid karyotype means that disruption of one allele is sufficient for knockout, simplifying genetic analysis. HAP1 cells retain relevant cancer signaling pathways, including integrin-mediated adhesion and focal adhesion dynamics, making them a relevant model for migration and invasion studies.
ASAP2 (ArfGAP with SH3 domain, ankyrin repeat and PH domain 2) functions as a GTPase-activating protein for ARF1 and ARF6, catalyzing GTP hydrolysis to downregulate Arf activity. Recruitment to phosphoinositide-rich membranes occurs via its PH domain, while its SH3 domain and ankyrin repeats facilitate interactions with focal adhesion components such as FAK, paxillin, and Crk. Upstream signaling through integrin-??1, FAK, Src, and PI3K generates PIP3, promoting ASAP2 localization and regulation of ARF1/ARF6. Consequently, ASAP2 modulates actin polymerization, focal adhesion turnover, and integrin trafficking, processes essential for cell migration.
In the HAP1 background, ASAP2 knockout disrupts Arf GTPase regulation, leading to altered focal adhesion dynamics and impaired migration??a phenotype readily interrogated in this genetically tractable system. The near-haploid nature of HAP1 cells enhances the utility of the polyclonal knockout for loss-of-function screens and high-content imaging, as every cell carries a disrupted allele. This model is particularly valuable for studying the role of ASAP2 in cancer invasion and metastasis.
Applications include Western blotting for ASAP2, ARF1-GTP, ARF6-GTP, and phospho-FAK; immunofluorescence analysis of focal adhesions using paxillin or vinculin markers; and live-cell imaging of migration and invasion. Co-immunoprecipitation experiments can assess interactions with FAK or paxillin, while GTPase activity and actin polymerization assays provide functional readouts. This polyclonal knockout model is a versatile tool for functional genomics, cancer cell biology, and ARF GTPase research. For further information, contact Ascent Research.
