EEA1 Knockout Ca Ski Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the Ca Ski human cervical carcinoma cell line, featuring targeted disruption of the EEA1 gene. This product provides a heterogeneous pool of gene-edited cells, eliminating the need for clonal isolation while establishing a reliable loss-of-function model for studying early endosome biology and receptor trafficking.
The Ca Ski host cell line is an adherent epithelial cell line originating from a cervical epidermoid carcinoma metastasis. These cells harbor integrated HPV-16 genomes and constitutively express viral oncoproteins E6 and E7, which target p53 and pRb, respectively. Ca Ski cells are a standard model for HPV-driven cervical carcinogenesis, enabling investigation of oncogene cooperation and host signaling pathways.
EEA1 is an early endosome tethering factor that functions as a phosphatidylinositol 3-phosphate (PI3P) effector downstream of Rab5 GTPase. It binds PI3P via its FYVE domain and interacts with Rab5, Rabaptin-5, and Rabex-5 to stabilize active Rab5 on endosomal membranes. EEA1 also engages SNARE proteins, including Syntaxin 6 and Syntaxin 13, to promote SNARE complex assembly and membrane fusion. Upstream, class III PI3K VPS34 generates PI3P, which recruits EEA1. Downstream, EEA1 mediates homotypic early endosome fusion and cargo sorting, essential for EGFR degradation and endosomal maturation to late endosomes. Disruption of EEA1 thus impairs key endocytic trafficking steps.
In HPV-16 positive Ca Ski cells, EEA1 knockout likely disrupts endosomal trafficking dynamics that may influence viral oncoprotein activity and receptor degradation. Since EGFR internalization and lysosomal targeting rely on EEA1-dependent endosome fusion, EEA1 loss could prolong EGFR signaling, potentially synergizing with E6/E7-mediated transformation. Defective endocytosis may also affect HPV entry, intracellular trafficking, and host innate immune responses. This model therefore offers a platform to dissect how endosomal dysfunction intersects with HPV-induced carcinogenesis.
Research applications include Western blotting for EEA1 depletion verification, immunofluorescence microscopy to visualize endosomal morphology changes, and functional assays such as transferrin uptake and EGFR degradation kinetics. Cell proliferation, migration, and invasion assays can reveal downstream phenotypic impacts. Additionally, analysis of HPV E6/E7 expression and PI3P localization can link trafficking disruption to viral protein biology. This knockout pool supports studies in drug delivery, autophagy, and membrane trafficking diseases. For further information, please contact Ascent Research.
