The KRT7 Knockout CAL-27 Polyclonal Cells product provides a CRISPR/Cas9-edited polyclonal knockout cell population derived from the CAL-27 host cell line, designed for loss-of-function studies of the human KRT7 gene. This product is supplied as a heterogeneous pool of cells, each carrying a genetic disruption introduced by CRISPR/Cas9-mediated targeting of the KRT7 locus. The polyclonal format preserves the natural diversity of editing outcomes, enabling researchers to assess overall gene function without selecting for a specific clonal genotype. It is an ideal tool for investigating the oncogenic and structural roles of KRT7 in epithelial-derived cancers, particularly oral squamous cell carcinoma, and is amenable to a broad range of downstream cellular and molecular assays. Researchers should note that the product does not guarantee complete biallelic knockout in every cell, reflecting the expected spectrum of CRISPR editing within the population.
The host cell line, CAL-27, is a well-characterized human tongue squamous cell carcinoma cell line isolated from a metastatic lesion. CAL-27 cells are HPV-negative and maintain wild-type p53 status, making them a clinically relevant model for studying the molecular mechanisms of oral cancer progression in the absence of viral oncoprotein interference. The cell line exhibits an epithelial morphology, robust in vitro proliferation, and metastatic potential, providing a suitable background for examining cytoskeletal dynamics, cell adhesion, and invasion. Its established use in cancer biology research ensures that data generated with this knockout model can be contextualized within a substantial body of existing literature on squamous cell carcinoma signaling and therapeutic response.
KRT7 encodes a type II intermediate filament protein, keratin 7, which forms obligate heterodimers with type I keratins??most notably KRT19 and, in some contexts, KRT8 and KRT18??to assemble the intermediate filament network that underpins the mechanical integrity of simple epithelial cells. KRT7 function is regulated upstream by epidermal growth factor receptor (EGFR), signal transducer and activator of transcription 3 (STAT3), and the transcription factor TP63, which collectively modulate its expression in proliferating and differentiating epithelia. Downstream, KRT7 contributes to the control of cell migration, cell stiffness, and apoptosis resistance. It physically interacts with the cytolinker proteins plectin (PLEC) and desmoplakin (DSP), which anchor keratin filaments to desmosomes and hemidesmosomes, thereby integrating the intermediate filament system with intercellular junctions and the actin cytoskeleton via cross-talk with beta-actin (ACTB). Disruption of KRT7 thus uncouples the filament network from key adhesive structures, impairing mechanical signal transduction.
Within the CAL-27 background, ablation of KRT7 is expected to profoundly alter the cytoskeletal architecture, leading to reduced cell stiffness, heightened migratory behavior, and potential shifts in epithelial-mesenchymal transition (EMT) programs. Given the metastatic origin of these cells, the knockout model enables dissection of how KRT7-dependent mechanical properties influence invasive capacity and metastatic dissemination in oral cancer. The loss of KRT7 may deregulate EGFR-STAT3 or TP63-mediated transcriptional networks, providing a platform to explore feedback loops that sustain the malignant phenotype. This polyclonal population, by retaining editing heterogeneity, better mimics the genetic variability seen in tumor tissue and avoids clonal artifacts, making it a powerful system for reproducible functional genomics studies.
Typical research applications for these cells span oral cancer biology, epithelial differentiation, EMT, cytoskeletal dynamics, and drug screening. Investigators can employ immunofluorescence or western blotting to validate KRT7 protein loss, wound healing and transwell migration assays to quantify motility, RT-qPCR to assess expression changes in related genes, and cell viability assays for chemotherapeutic response profiling. The KRT7 knockout model is particularly suited for characterizing the interplay between keratin intermediate filaments and oncogenic signaling pathways in squamous cell carcinoma. For technical inquiries, reagent support, or discussion of custom editing strategies, please contact Ascent Research.
