The DIAPH3 Knockout HAP1 Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population targeting the DIAPH3 gene in the HAP1 human near-haploid cell line. This product provides a loss-of-function model for DIAPH3, enabling systematic investigation of its roles in actin cytoskeleton dynamics, cell migration, and signal transduction. The polyclonal format preserves genetic diversity following target-gene disruption, offering a robust tool for functional genomics studies without clonal selection artifacts.
HAP1 cells, a subclone of the KBM-7 chronic myeloid leukemia line, are characterized by a near-haploid karyotype and an adherent fibroblast-like morphology. Originating from a male donor, this cell line has become a cornerstone in functional genomics and cancer biology due to its genetic simplicity, which reduces confounding effects from allelic redundancy. The near-haploid background facilitates the generation of unambiguous loss-of-function phenotypes, making HAP1 an ideal host for CRISPR-mediated gene disruption studies.
DIAPH3 encodes a diaphanous-related formin protein that functions as a key effector of Rho GTPase signaling, nucleating and elongating unbranched actin filaments. It is activated by RhoA and Rac1 downstream of growth factor receptors such as EGFR and PDGFR, and physically interacts with profilin, vinculin, APC, and tubulin to orchestrate the assembly of filopodia, lamellipodia, and stress fibers. Through its actin-nucleating activity, DIAPH3 also regulates SRF-mediated transcriptional programs. The protein sits at the nexus of the Rho GTPase cascade, connecting upstream activation to the reorganization of the actin cytoskeleton and the modulation of focal adhesion and adherens junction dynamics. Key pathway components including ROCK, LIMK, cofilin, integrins, FAK, paxillin, and talin cooperate with DIAPH3 to control cell adhesion, migration, and membrane protrusion formation. DIAPH3-mediated actin nucleation is essential for the formation of stress fibers, filopodia, and lamellipodia, which are fundamental structures for directed cell migration and adhesion dynamics.
The genetic simplicity of HAP1 cells amplifies the utility of DIAPH3 disruption, enabling unambiguous dissection of its contributions to cytoskeletal reorganization and cell motility. DIAPH3 is frequently overexpressed in breast, hepatocellular, and lung cancers and is linked to metastatic progression; its knockout in this model provides a powerful system to study tumor cell invasion and migration. Furthermore, as mutations in DIAPH3 cause autosomal dominant nonsyndromic hearing loss (DFNA1), this polyclonal knockout population allows investigation of actin dynamics relevant to hair cell stereocilia maintenance in a tractable cellular context. In the inner ear, DIAPH3 is required for the integrity of hair cell stereocilia, and knockout studies can model the actin-based pathology of hearing loss. The near-haploid background eliminates confounding heterozygosity, yielding clear phenotypic readouts.
Researchers can employ these polyclonal knockout cells in wound healing and transwell migration/invasion assays to quantify DIAPH3-dependent motility. Co-immunoprecipitation and western blotting facilitate the analysis of DIAPH3 interactions with profilin, vinculin, and other Rho pathway components, while immunofluorescence enables visualization of actin cytoskeletal structures. The model is also well-suited for drug target validation studies aimed at anti-metastatic therapies and for exploring DFNA1-related hearing loss mechanisms. RT-qPCR can monitor downstream transcriptional changes in SRF target genes. Together, these assays provide a comprehensive platform for elucidating DIAPH3 signaling and function. For additional technical specifications or ordering information, please contact Ascent Research.
