The KRT5 Knockout HAP1 Polyclonal Cells product constitutes a heterogeneous polyclonal population of HAP1 cells in which CRISPR/Cas9-mediated gene disruption has been introduced at the KRT5 locus, encoding the type II intermediate filament protein keratin 5. This polyclonal knockout pool, without clonal selection, provides a robust loss-of-function model for interrogating keratin 5 biology across a diverse mutant allele background, ensuring representative phenotypes and minimizing clonal artifacts. The pool is specifically designed for applications requiring a mixed genotype, such as screening and population-level assays where clonal homogeneity is not prerequisite.
HAP1 is a near-haploid human cell line originally derived from the chronic myeloid leukemia line KBM-7. It exhibits a fibroblastoid morphology, male origin, and a stable near-haploid karyotype that reduces genetic redundancy and simplifies interpretation of loss-of-function phenotypes. Widely employed in haploid genetic screens and CRISPR-based knockout studies, HAP1 enables efficient gene disruption due to its single-copy genome. Although not of epithelial origin, HAP1 offers a clean background for ectopic expression or functional analysis of genes not endogenously expressed in hematopoietic cells, making it a versatile platform for biomedical research.
Keratin 5 is an obligate heterodimerization partner of keratin 14 (KRT14), with which it assembles into intermediate filament networks anchored at desmosomes and hemidesmosomes through interactions with desmoplakin, plectin, and BPAG1. This cytoskeletal scaffold links to laminin-332 in the basement membrane, maintaining epithelial mechanical integrity and facilitating mechanotransduction. Upstream, KRT5 expression is transcriptionally regulated by TP63 and Notch1, while downstream signaling involves integrin ??6??4?Cmediated activation of phospho-Akt. The network is further modulated by AP-1, EGF, and TGF-alpha, placing keratin 5 at a nexus of structural stability and signaling coordination in basal epithelial cells.
Disruption of KRT5 in HAP1 cells, despite their non-epithelial origin, serves as a model to dissect keratin filament assembly, stability, and interaction networks devoid of confounding endogenous keratin expression. In this background, ectopically expressed KRT5 and its partners can be studied to define structure?Cfunction relationships, while the polyclonal nature reflects a spectrum of mutation-induced phenotypes. This enables investigation of keratin-dependent processes such as cell adhesion, resistance to mechanical stress, and signaling downstream of integrin-mediated adhesion, which are fundamental to understanding diseases like epidermolysis bullosa simplex and squamous cell carcinoma.
Typical research applications include immunofluorescence microscopy to visualize intermediate filament organization, western blotting to assess KRT5 and KRT14 protein levels, cell adhesion and wound healing scratch assays to evaluate functional outcomes, co-immunoprecipitation for protein?Cprotein interactions, and phospho-signaling analyses to interrogate pathways downstream of keratin networks. The cells are suitable for modeling skin fragility syndromes, investigating keratin dynamics during epithelial-to-mesenchymal transition, and screening small molecules that modulate keratin cytoskeleton integrity. For additional information or customization, please contact Ascent Research.
