The KRT7 Knockout 786-O Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population targeting the KRT7 gene in the 786-O human clear cell renal cell carcinoma (ccRCC) line. This gene-disrupted pool, generated by CRISPR/Cas9-mediated genome editing, consists of a heterogeneous mixture of cells with diverse loss-of-function edits. It provides a robust experimental model that circumvents clonal selection artifacts, enabling the study of KRT7-dependent phenotypes in a genetically relevant cancer context.
The 786-O parental line is a widely used epithelial cancer cell model derived from a primary human clear cell renal carcinoma with a naturally occurring frameshift mutation in the von Hippel-Lindau (VHL) tumor suppressor gene. This mutation leads to constitutive stabilization of hypoxia-inducible factors (HIFs) and a pseudo-hypoxic phenotype that promotes angiogenesis and metabolic reprogramming. The VHL-mutant background makes 786-O cells particularly suitable for investigating how keratin intermediate filament integrity interfaces with oncogenic signaling networks in ccRCC.
KRT7 encodes a 54 kDa type II keratin that obligately heterodimerizes with type I keratins, predominantly KRT8 and KRT18, to assemble into 10-nm intermediate filaments (IFs) integral to the epithelial cytoskeleton. These IF networks anchor to desmosomal cell?Ccell junctions through direct interactions with desmoplakin and plakoglobin, and they connect to hemidesmosomes and focal adhesions via the cross-linker plectin. KRT7 expression is transcriptionally activated by epidermal growth factor (EGF) and transforming growth factor alpha (TGF-??) through downstream effectors including p63 and c-Jun, and it is frequently upregulated in adenocarcinomas of the ovary, breast, and lung. Disruption of KRT7 abolishes the KRT7?CKRT8/KRT18 filament scaffold, compromising desmosomal adhesion and plasma membrane?Ccytoskeleton coupling. Consequently, cells exhibit diminished mechanical integrity, impaired force transmission, and reduced collective migration and invasion.
In the 786-O context, KRT7 knockout allows dissection of how keratin-dependent structural mechanics contribute to the malignant behavior of VHL-mutant ccRCC. The HIF-driven transcriptional program may cooperate with or offset the loss of filament-based resilience, and the polyclonal population reflects intratumoral heterogeneity, facilitating studies of clonal dynamics under selection. Moreover, because 786-O cells lack functional VHL, this model enables investigation of KRT7 functions independently of VHL-mediated degradation, potentially uncovering synthetic lethal interactions or therapeutic targets.
Typical applications include immunofluorescence microscopy to visualize keratin network collapse and altered desmoplakin distribution, scratch wound and Transwell invasion assays to quantify migration, and cell adhesion assays to measure attachment strength. Desmosome integrity can be assessed by co-localization of desmoplakin and plakoglobin. This model supports research into epithelial cancer invasion, cytoskeletal dynamics, drug resistance, and intermediate filament biology, as well as co-culture and high-content screening approaches. For additional technical information and support, please contact Ascent Research.
