The CRISPR/Cas9-edited DTNB knockout HEK293T polyclonal cell population is a loss-of-function model for studying dystrobrevin beta in human embryonic kidney epithelial cells. Comprising a heterogeneous pool of CRISPR-targeted cells, this product circumvents clonal selection biases and ensures robust gene disruption across the population. The polyclonal format enhances reproducibility in functional genomics by maintaining genetic diversity, making it ideal for experiments that demand consistent knockout phenotypes without the artifacts of monoclonal lines.
HEK293T cells are human embryonic kidney epithelial cells that endogenously express the SV40 large T antigen, promoting episomal replication of SV40 origin-containing plasmids and enabling high-level transient protein expression. This feature, along with their epithelial origin, makes them a preferred host for viral packaging, CRISPR-based genome editing, and studies of renal ion transport, polarity, and endocrine signaling. Their robust growth and ease of transfection facilitate high-throughput cellular assays.
DTNB encodes ??-dystrobrevin, a cytoplasmic scaffold protein within the dystrophin-associated glycoprotein complex (DAPC) that mechanically links the actin cytoskeleton to the extracellular matrix. It directly binds dystrophin and syntrophin, associates with dystroglycan and sarcoglycans, and recruits the signaling adaptor Grb2, thereby coupling DAPC integrity to MAPK and NF-??B pathways. ??-dystrobrevin contributes to synapse formation, muscle membrane stability, and intracellular signal transduction, with its expression regulated by myogenic transcription factors (MyoD, myogenin), mechanical stress, calcium influx, and neuregulin. Downstream, it governs the subcellular distribution of dystrophin, nNOS, voltage-gated sodium channels, and Grb2-mediated signaling complexes.
Disruption of DTNB in HEK293T cells destabilizes DAPC assembly, impairing cell-matrix adhesion and mechanotransduction. Since HEK293T cells endogenously express many DAPC components, this model allows direct assessment of ??-dystrobrevin’s scaffolding function without muscle-specific complexities. DTNB loss also attenuates MAPK and NF-??B signaling, affecting proliferation, survival, and stress responses. Leveraging the epithelial nature of HEK293T, researchers can investigate how DAPC disruption influences renal ion transport, polarity, and viral production, connecting DAPC biology to kidney physiology and host-pathogen interactions.
These polyclonal knockout cells are suited for dissecting DAPC assembly via co-immunoprecipitation and immunofluorescence, and for measuring adhesion changes in attachment assays. They support phospho-signaling profiling of DTNB-dependent MAPK/NF-??B activation, as well as RNA-seq to map transcriptome-wide effects of ??-dystrobrevin loss. The model also serves as a platform for screening small molecules that restore DAPC function or signaling in muscular dystrophy research. For inquiries and custom applications, contact Ascent Research.
