The KRT5 Knockout HEK293T Polyclonal Cells product is a CRISPR/Cas9-edited polyclonal knockout cell population with targeted disruption of the KRT5 gene in HEK293T cells. This heterogeneous pool enables loss-of-function studies of keratin 5 while maintaining genetic diversity, avoiding artifacts from single-cell cloning. It provides a versatile tool for probing intermediate filament biology and adhesion complex dynamics.
HEK293T cells, a derivative of HEK293, constitutively express the SV40 large T-antigen, facilitating high-level transient and stable protein production and viral packaging. Their epithelial origin combined with a dedifferentiated state allows ectopic expression of keratins without interference from endogenous intermediate filament networks, making them an ideal chassis for studying keratin 5 function in a simplified cellular environment.
Keratin 5 (KRT5) is a type II intermediate filament protein that dimerizes with keratin 14 (KRT14) to form structural networks essential for epithelial mechanical integrity. Transcriptional regulation is governed by p63, while TGF-??, BMPs, EGF, and retinoids modulate expression. At adhesion sites, KRT5-containing filaments associate with desmoplakin, plakoglobin, plakophilin, alpha6beta4 integrin, BPAG1, and plectin, anchoring junctions to the cytoskeleton. Disruption of KRT5 in the polyclonal knockout population eliminates functional keratin heterodimers, destabilizing these macromolecular assemblies and compromising cell?Csubstrate and cell?Ccell adhesion.
In the background of HEK293T cells lacking endogenous keratins, KRT5 knockout eliminates any ectopically introduced filament capacity, enabling precise dissection of keratin network requirements for desmosome integrity and cytoskeletal dynamics. The polyclonal nature allows pooled screening and bulk biochemical assays without clonal selection bias. Reconstitution with mutant KRT5 variants facilitates mapping of interaction domains with KRT14 and adaptors such as plectin and desmoplakin, while the high transfectability of HEK293T cells supports efficient delivery of expression constructs for structure-function analyses.
This model is applied in immunofluorescence-based assessment of keratin network formation, co-immunoprecipitation to examine binding partners like plakoglobin and BPAG1, and functional assays such as cell spreading and scratch wound migration to evaluate adhesion-dependent processes. It is also deployed in drug screening campaigns for epidermolysis bullosa therapeutics, testing compounds that promote proper filament assembly or stabilize desmosomal complexes. For further technical specifications, please contact Ascent Research.
