The ARHGAP1 Knockout HAP1 Polyclonal Cells offer a CRISPR/Cas9-edited polyclonal knockout cell population for investigating Rho GTPase signaling pathways. This product features a heterogeneous population of HAP1 cells carrying targeted disruption of the ARHGAP1 gene, which encodes a GTPase-activating protein (GAP) for Rho family GTPases. The polyclonal format ensures a diverse representation of loss-of-function alleles, providing a robust model for functional studies without clonal isolation. This knockout system avoids the limitations of single-cell derived lines and better mimics the genetic heterogeneity encountered in biological systems.
The host cell line, HAP1, is a near-haploid human cell line derived from a male patient with chronic myeloid leukemia (CML). HAP1 cells harbor the BCR-ABL fusion gene characteristic of CML and possess a haploid karyotype, making them an invaluable tool for genetic screening and knockout studies. The haploid state simplifies gene targeting and enables straightforward analysis of knockout phenotypes without interference from a second allele. This cell line is widely used in functional genomics, drug discovery, and signaling research due to its genetic stability and ease of manipulation.
ARHGAP1 encodes a GTPase-activating protein that catalyzes GTP hydrolysis on Rho family GTPases (RhoA, Rac1, and Cdc42), converting them to inactive GDP-bound states. This negatively regulates actin cytoskeleton dynamics, cell adhesion, and migration. ARHGAP1 is activated downstream of growth factor receptors (e.g., EGFR) and integrin engagement via Src family kinases and FAK. It directly interacts with RhoA, Rac1, and Cdc42, as well as paxillin, to modulate focal adhesion turnover. Downstream, inactivation of RhoA suppresses ROCK-LIMK-cofilin signaling, while inactivation of Rac1/Cdc42 reduces WAVE/WASP-mediated actin polymerization via the Arp2/3 complex.
In the HAP1 leukemia background, ARHGAP1 knockout provides a unique context to study the interplay between BCR-ABL-driven oncogenic signaling and Rho GTPase-dependent cytoskeletal reorganization. The near-haploid nature ensures that even subtle phenotypic changes are readily detectable, making this model suitable for high-content screening and drug sensitivity assays. Loss of ARHGAP1 function in these cells can reveal alterations in cell shape, motility, and adhesion, which are critical for understanding leukemia dissemination and niche interactions. This model may also uncover vulnerabilities associated with cytoskeletal regulation in CML cells, offering potential targets for therapeutic intervention.
This polyclonal knockout cell pool is ideal for Western blotting, Rho activation assays, cell migration and invasion studies (wound healing, Transwell), and immunofluorescence for actin stress fibers and focal adhesions. It also supports live-cell imaging of cytoskeleton dynamics, proliferation assays, and phospho-signaling analysis of FAK and Src. Applicable to genetic screens, drug target validation, and cancer migration research. For further details, contact Ascent Research.
