The DTNA Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed for loss-of-function studies of the DTNA gene, which encodes alpha-dystrobrevin. This polyclonal pool, generated in the HEK293T background, offers a heterogeneous knockout model suitable for investigating the functional roles of DTNA in the dystrophin-associated protein complex (DAPC) and related signaling pathways. The CRISPR-mediated gene disruption provides a stable model for dissecting DTNA-dependent cellular processes without the need for clonal isolation.
HEK293T cells are a widely used human embryonic kidney epithelial cell line that stably expresses the SV40 large T antigen, facilitating high-level plasmid replication with SV40 origin and efficient production of recombinant proteins and lentiviral vectors. Their epithelial origin and robust transfection efficiency make them a versatile platform for studying protein interactions, signal transduction, and genetic perturbation. The DTNA knockout in this background provides a controlled system to examine the contribution of alpha-dystrobrevin to membrane stability and adhesion signaling.
Alpha-dystrobrevin (DTNA) is a scaffolding protein in the DAPC that connects the actin cytoskeleton to the extracellular matrix by binding dystrophin (DMD), utrophin (UTRN), and dystroglycan (DAG1). It transduces signals by anchoring nNOS and regulating MAPK/ERK pathway activation through interactions with syntrophins (SNTA1, SNTB1). DTNA activity is modulated by mechanical stretch, PKA-mediated phosphorylation, and calcium-dependent calpain proteolysis. These interactions control actin polymerization and cell survival, coupling membrane integrity to intracellular signaling.
In HEK293T cells, DTNA knockout disrupts DAPC assembly and weakens cell-matrix adhesion, though the epithelial background offers a simplified model to study core DAPC components without muscle-specific complexity. Loss of DTNA alters nNOS localization and dampens MAPK/ERK signaling, mirroring defects observed in left ventricular noncompaction, muscular dystrophy, and cardiomyopathy. This model enables dissection of DTNA’s role in mechanotransduction and adhesion dynamics.
Key applications include western blotting and co-immunoprecipitation of DAPC proteins, immunofluorescence for focal adhesion and actin staining, cell adhesion assays on extracellular matrix coatings, scratch wound healing migration assays, and MTT viability tests under mechanical stress. Calcium imaging and RT-qPCR for MAPK targets further elucidate signaling consequences. These polyclonal knockout cells are valuable for membrane-stabilization drug screening and CRISPR model validation. For more information, contact Ascent Research.
