The KRT5 Knockout 786-O Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed for loss-of-function analysis of the KRT5 gene in a defined epithelial cancer background. This mixed population harbors targeted KRT5 disruptions, enabling robust functional studies without clonal selection artifacts. The polyclonal format captures a spectrum of editing outcomes, making it suitable for pooled screening and for experiments requiring representation of phenotypic heterogeneity.
The 786-O host cell line is a human renal cell carcinoma epithelial line derived from a primary clear cell adenocarcinoma of the kidney. It carries a homozygous frameshift mutation in the VHL tumor suppressor gene, leading to constitutive stabilization of hypoxia-inducible factors and constitutive HIF pathway activation. This is a hallmark of clear cell renal cell carcinoma (ccRCC). The hypertriploid, epithelial nature of these cells provides a physiologically relevant platform for investigating cytoskeletal elements in carcinoma progression.
KRT5 encodes keratin 5, a type II intermediate filament protein that forms obligatory heterodimers with type I keratin 14 (KRT14) to build the basal epithelial cytoskeleton. Transcription of KRT5 is driven by the master regulator p63 (TP63) and AP-1 transcription factors, while its function is modulated by upstream EGFR and TGF-?? signaling. Within the cell, keratin 5 interacts with desmosomal components such as desmoplakin (DSP), plakoglobin (JUP), plakophilin 1 (PKP1), and envoplakin (EVPL), and it influences expression of integrin ??4 (ITGB4). These connections integrate intermediate filament organization with cell adhesion and Rho GTPase-governed cytoskeletal dynamics, positioning KRT5 at a nexus of mechanotransduction and growth factor signaling.
Disruption of KRT5 in the 786-O ccRCC model is anticipated to compromise intermediate filament network integrity, leading to altered cell adhesion, impaired directional migration, and increased susceptibility to mechanical stress. Given the constitutive HIF activation inherent to these cells, loss of keratin 5 may also intersect with hypoxia-driven pathways that regulate epithelial-mesenchymal plasticity and invasion. Consequently, this knockout system offers a unique tool for dissecting how keratin cytoskeletal perturbations modulate tumor cell mechanics and invasive behavior in a VHL-mutant background.
These polyclonal knockout cells support diverse applications, including Western blotting and co-immunoprecipitation for assessing loss of KRT5 and associated proteins; immunofluorescence to visualize intermediate filament architecture; and functional assays such as Transwell migration, adhesion, and wound healing to quantify motility changes. They can be employed to screen compounds targeting keratin-related skin disorders like epidermolysis bullosa simplex or to investigate the role of keratins in carcinoma metastasis. Transcriptomic analysis via RNA-seq can reveal downstream transcriptional consequences of KRT5 disruption. For detailed specifications and assistance, contact Ascent Research.
