The IFT88 Knockout Ca Ski Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the Ca Ski human cervical squamous carcinoma cell line. This product features CRISPR/Cas9-mediated disruption of the IFT88 gene, resulting in a heterogeneous pool of cells with targeted loss-of-function mutations in the IFT88 locus. The polyclonal format offers a biologically diverse model system that better recapitulates the genetic variability observed in tumor populations, making it suitable for studying IFT88-dependent processes in a cancer-relevant background. As a gene-edited product, these cells provide a versatile tool for investigating ciliary biology, signal transduction, and oncogenic pathways without the need for clonal selection.
Ca Ski is a well-characterized human epithelial cell line derived from a cervical squamous cell carcinoma and is persistently infected with human papillomavirus type 16 (HPV16). This cell line retains key features of HPV-driven cervical cancer, including expression of viral oncoproteins E6 and E7, which inactivate tumor suppressors p53 and pRb, respectively. Ca Ski cells are widely employed as a model system for cervical carcinoma research, enabling the study of HPV-mediated transformation, tumorigenesis, and therapeutic responses. The integration of IFT88 knockout into this background permits the dissection of cilia-dependent signaling contributions to HPV-induced malignancy.
IFT88 encodes a core component of the intraflagellar transport complex B (IFT-B), which is essential for anterograde transport within cilia and flagella. As an adaptor protein, IFT88 bridges the IFT-A and IFT-B complexes, facilitating the bidirectional movement of cargo along the axoneme. Its function is critical for ciliogenesis, and loss of IFT88 effectively ablates primary cilia formation. Within signaling cascades, IFT88 operates downstream of transcription factors such as RFX and FOXJ1, and upstream of key effectors including SMO and GLI transcription factors (GLI1, GLI2, GLI3). IFT88 physically interacts with IFT20, IFT52, IFT57, and IFT144, as well as motor proteins kinesin-2 and dynein-2, to orchestrate the transport of ciliary membrane proteins like ARL13B. The IFT88-dependent ciliary axis is integral to hedgehog signaling, wherein ligand binding to PTCH1 alleviates SMO repression, leading to GLI-mediated transcriptional activation. Similarly, IFT88 is implicated in Wnt and planar cell polarity pathways, where ciliary receptors modulate downstream cascades. Disruption of IFT88 therefore causes a pleiotropic blockade of these signal transduction routes, impacting cell fate decisions, proliferation, and differentiation.
In the Ca Ski cervical carcinoma model, IFT88 knockout provides a unique platform to explore the intersection of HPV oncogenesis and ciliary signaling. Although many cancer cells downregulate cilia, Ca Ski cells have been reported to retain primary cilia under certain conditions, making them a pertinent system to assess cilia-dependent hedgehog pathway activity in the context of HPV16 E6/E7 expression. IFT88 loss abrogates hedgehog signaling, which is often aberrantly activated in cervical cancers and contributes to tumor growth, invasion, and chemoresistance. Consequently, these polyclonal knockout cells enable researchers to uncouple ciliary contributions from HPV-driven processes, potentially revealing vulnerabilities or synergistic dependencies. Additionally, because IFT88 mutations are linked to ciliopathies such as short rib-polydactyly and Jeune syndrome, this model may also serve as a tool for investigating ciliopathy mechanisms in an epithelial cancer milieu, offering insights into disease overlap.
Researcher applications for IFT88 Knockout Ca Ski Polyclonal Cells are broad, spanning fundamental cilia biology, oncogenic signaling, and translational screening. Typical experimental approaches include immunofluorescence staining for ciliary markers (acetylated tubulin, ARL13B) to visualize cilia loss, western blot analysis of IFT88 and associated complex proteins, and RT-qPCR for hedgehog target genes such as GLI1 and PTCH1. Functional assays such as wound healing, migration, and invasion can be employed to assess the impact of IFT88 disruption on metastatic behaviors, while apoptosis and cell cycle flow cytometry assays delineate effects on cell survival and proliferation. Drug sensitivity assays using hedgehog pathway inhibitors (e.g., vismodegib) or chemotherapeutic agents allow the exploration of cilia-dependent drug responses. These cells are also suitable for co-culture experiments and in vivo xenograft studies. For further information, please contact Ascent Research.
