EHBP1L1 Knockout HAP1 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population specifically designed for functional studies of the EHBP1L1 gene. This product comprises a pool of HAP1 cells with targeted disruption of the EHBP1L1 locus, providing a loss-of-function model without clonal selection. The polyclonal format ensures representation of multiple knockout genotypes, facilitating robust phenotypic analyses while averting clonal artifacts.
The HAP1 host cell line is a near-haploid human cell line derived from the KBM-7 chronic myelogenous leukemia line and adapted for adherent growth. Its near-haploid karyotype simplifies gene targeting and removes the complexity of diploid gene redundancy, enabling unambiguous genotype-phenotype correlations. HAP1 cells are widely utilized in high-throughput genetic screens and targeted knockout studies due to their ease of manipulation and rapid growth kinetics.
EHBP1L1 functions as a critical Rab8 effector that physically links activated RAB8A and RAB8B to the actin cytoskeleton and the BBSome complex. Through interactions with EHBP1, actin filaments, and BBSome components including IFT20 and ARL13B, EHBP1L1 coordinates endocytic membrane trafficking and primary cilium formation. It promotes ciliary membrane extension by coupling Rab8-driven vesicle transport to actin dynamics mediated by the ARP2/3 complex. Additionally, EHBP1L1 regulates endosomal recycling of cell surface receptors, placing it at a nexus of membrane trafficking and cytoskeletal organization. Disruption of EHBP1L1 abrogates these processes, leading to impaired ciliogenesis and defective receptor recycling.
In the HAP1 near-haploid background, EHBP1L1 knockout provides an uncomplicated genetic system for dissecting Rab8-dependent pathways. The absence of a second allele ensures complete loss-of-function at the protein level, allowing clear attribution of observed phenotypes to EHBP1L1 deficiency. This model is particularly valuable for investigating primary cilium biology, as HAP1 cells can be induced to form cilia under serum starvation. Phenotypes such as absent or shortened cilia can be readily quantified, making the model suitable for ciliopathy research and evaluation of therapeutic interventions targeting ciliary signaling.
Researchers can employ this knockout cell population in a variety of assays to probe EHBP1L1 function. Immunofluorescence staining for ciliary markers (acetylated tubulin, ARL13B) enables assessment of ciliogenesis defects, while transferrin uptake assays provide a direct readout of endocytic trafficking efficiency. Wound healing and actin staining experiments reveal alterations in cell migration and cytoskeletal dynamics. Co-immunoprecipitation studies can validate interactions with RAB8A, BBSome subunits, or actin. These applications support investigations into retinal dystrophy, where ciliary dysfunction is pathogenic, and cancer biology, where membrane trafficking influences metastasis. For further technical information and guidance, please contact Ascent Research.
