The JUP Knockout HEK293T Polyclonal Cells product comprises a CRISPR/Cas9-edited polyclonal knockout cell population targeting the JUP gene, which encodes plakoglobin. This heterogeneous pool of HEK293T cells carries diverse gene-disrupting mutations, providing a robust model for studying plakoglobin-dependent processes while avoiding clonal biases. The polyclonal format is especially suited for pooled screening and functional genomics experiments, enabling researchers to dissect the dual roles of plakoglobin in cell adhesion and Wnt signal transduction.
The host cell line, HEK293T, is a highly transfectable human embryonic kidney epithelial derivative that stably expresses the SV40 large T-antigen, thereby facilitating efficient recombinant protein expression and viral vector production. Originating from HEK293 cells, HEK293T retains epithelial characteristics and expresses key junctional and signaling components, offering a relevant context for analyzing plakoglobin function at adherens junctions and desmosomes. Its genetic tractability also allows for rescue and epistasis experiments in conjunction with the JUP knockout.
JUP encodes plakoglobin (??-catenin), an armadillo repeat protein that functions as a structural linker at cell?Ccell junctions and a transcriptional coactivator in canonical Wnt signaling. At the plasma membrane, plakoglobin bridges cadherins to the actin cytoskeleton in adherens junctions and interacts with desmosomal cadherins (desmocollin, desmoglein) to link to desmoplakin and the intermediate filament network. Key junctional partners include E-cadherin, N-cadherin, and ??-catenin. In the nucleus, plakoglobin acts downstream of Wnt stimulation: upon Wnt3a binding to Frizzled and LRP5/6 receptors, Dishevelled inhibits the destruction complex (AXIN, APC, GSK-3??), stabilizing plakoglobin. Plakoglobin then translocates to the nucleus, competes with ??-catenin for TCF/LEF binding, and regulates target genes such as MYC and CCND1, influencing cell proliferation and differentiation. Plakoglobin activity is further modulated by phosphorylation from Src and EGFR kinases, which can shift its distribution between junctional and transcriptional compartments.
In the HEK293T cellular context, JUP knockout provides a powerful platform to discriminate between the structural and signaling roles of plakoglobin. These cells endogenously express Wnt pathway components and form rudimentary cell?Ccell contacts, allowing researchers to examine how loss of plakoglobin impacts adhesion integrity, desmosome assembly, and EMT without exogenous pathway manipulation. This model is directly relevant to diseases caused by JUP mutations, including ARVC, Naxos disease, and palmoplantar keratoderma with woolly hair, where defective desmosomes lead to tissue fragility and aberrant signaling. Moreover, because plakoglobin can exhibit both tumour-suppressive and pro-metastatic activities depending on the cellular context, this knockout system is valuable for exploring its dichotomous role in cancer progression.
The polyclonal knockout population is well-suited for a broad range of experimental applications. Researchers can perform Western blotting to confirm plakoglobin depletion and monitor ??-catenin levels, or use immunofluorescence to visualize the loss of junctional plakoglobin localization. Co-immunoprecipitation assays enable the analysis of altered interactions between plakoglobin and key partners such as E-cadherin and desmoplakin. Functional studies can employ TCF/LEF luciferase reporter assays to quantify Wnt transcriptional activity, cell aggregation assays to evaluate adhesion, and wound healing assays to assess migration. Additionally, RT-qPCR can measure changes in Wnt target gene expression (e.g., MYC, CCND1), while flow cytometry permits profiling of desmosomal protein surface levels. For further information or technical support, contact Ascent Research.
