The KIF3A Knockout HAP1 Polyclonal Cells provide a CRISPR/Cas9-edited polyclonal knockout cell population targeting the KIF3A gene in the HAP1 near-haploid human cell line. This polyclonal pool contains diverse KIF3A-disrupted alleles generated by CRISPR/Cas9-mediated gene disruption, offering a mixed genotype for loss-of-function studies without single-cell cloning artefacts. The population format is well-suited for pooled screens, bulk biochemical analyses, and initial functional characterization of KIF3A-dependent processes.
HAP1 cells are derived from a male chronic myeloid leukemia patient and carry the BCR-ABL1 fusion oncogene while maintaining a stable near-haploid karyotype. This haploid genome simplifies genetic analysis by permitting unambiguous gene disruption, as a single targeting event eliminates gene function. The cell line is compatible with standard culture conditions, high-throughput imaging, and a broad range of biochemical and genetic assays, making it a versatile host for studying ciliary biology and signaling pathways.
KIF3A encodes the catalytic motor subunit of the heterotrimeric kinesin-2 complex, which also includes the KIF3B motor subunit and the adaptor protein KAP3 (KIFAP3). This motor complex drives anterograde intraflagellar transport (IFT) along ciliary axonemes, delivering cargo essential for ciliogenesis and ciliary signaling. KIF3A interacts directly with multiple IFT-B complex components, such as IFT20 and IFT88, and its function is critical for Hedgehog pathway activation by facilitating the proper localization and processing of Smoothened and Gli transcription factors. Upstream regulators including RFX transcription factors and FoxJ1 control KIF3A expression during ciliogenesis, while downstream targets encompass tubulin, ciliary membrane proteins, and the polycystin complex. Disruption of KIF3A therefore impairs IFT, leading to defective cilia assembly and attenuated Hedgehog and Wnt/??-catenin signaling.
In the HAP1 near-haploid background, KIF3A knockout provides a clean genetic model to dissect ciliary biology and ciliopathy mechanisms without diploidy complications. The loss-of-function phenotype allows direct assessment of defective ciliogenesis, aberrant Hedgehog transduction, and potential effects on planar cell polarity and cell cycle regulation. This system is particularly valuable for modeling ciliopathies such as polycystic kidney disease, retinitis pigmentosa, and Joubert syndrome, as well as cancers where ciliary signaling is deregulated, including medulloblastoma and breast cancer.
Researchers can employ immunofluorescence staining for ciliary markers such as Arl13b and acetylated ??-tubulin to quantify cilia length and frequency, western blotting for KIF3A and downstream effectors, and Gli-luciferase reporter assays to measure Hedgehog pathway activity. RT-qPCR analysis of Hedgehog target genes and flow cytometry-based detection of ciliation status enable detailed molecular phenotyping. The KIF3A Knockout HAP1 Polyclonal Cells are also suitable for high-content screening of cilia-modulating compounds and mechanistic studies of intraflagellar transport. For additional technical information, please contact Ascent Research.
