The DSC3 knockout HAP1 polyclonal cells are a CRISPR/Cas9-edited population derived from the near-haploid HAP1 human cell line, with DSC3 gene disruption abolishing desmocollin-3 expression. As a polyclonal pool, these cells harbor diverse mutations, providing a robust loss-of-function model without monoclonality. This format is advantageous for functional genomic screens and studying collective impact of DSC3 deficiency on desmosomal biology and signaling.
HAP1 is a near-haploid human cell line from KBM-7 chronic myeloid leukemia, with adherent, fibroblast-like morphology. Its haploidy enables single-allele disruptions to cause complete loss of function, making it ideal for knockout screens. Although HAP1 does not form canonical desmosomes, it expresses cadherin-related proteins, offering a clean background for studying non-junctional DSC3 functions or reconstituting desmosomal components.
DSC3 encodes a calcium-dependent cadherin essential for desmosome integrity in stratified epithelia. Its extracellular domains mediate homophilic adhesion, while its cytoplasmic tail recruits plakoglobin (??-catenin) and desmoplakin, linking intermediate filaments to the membrane. Transcriptionally regulated by p63, DSC3 responds to Wnt/??-catenin, PKC, and retinoid signals. In desmosomes, it partners with desmoglein 3, plakophilin 2, and armadillo repeat proteins. Loss of DSC3 disrupts adhesion, promotes cytoskeletal reorganization, and enhances migration. Additionally, by sequestering ??-catenin at junctions, DSC3 modulates Wnt pathway activity, impacting epithelial-mesenchymal transition and keratinocyte differentiation. DSC3 mutations cause autosomal recessive hypotrichosis and skin fragility syndromes, highlighting its essential role in epithelial integrity.
In HAP1 cells, this knockout dissects signaling functions distinct from structural adhesion. The haploid background supports genetic modifier screens and CRISPR-based synthetic lethality studies. Lacking desmosomes, HAP1 allows evaluation of DSC3??s role in Wnt dynamics, migration, and differentiation without adhesion confounding. Thus, it is a versatile model for cancer dissemination research and cadherin-targeted drug screening.
Applications include immunofluorescence of desmosomal plaques, calcium-switch reassembly assays, and migration/invasion studies. The polyclonal pool enables RNA-seq and proteomic profiling of DSC3-dependent networks. For haploid screens, these cells rapidly identify genetic interactions in cadherin biology or epithelial fragility. Complementation with wild-type DSC3 rescues adhesion phenotypes. For further information, contact Ascent Research.
