DTNBP1 Knockout Raji Polyclonal Cells are a pooled CRISPR/Cas9-edited polyclonal cell population derived from the Raji human B lymphocyte line, engineered to disrupt the DTNBP1 gene. This heterogeneous knockout model introduces loss-of-function genetic alterations across a polyclonal background, providing a robust system for studying dysbindin-dependent cellular processes without the biases of a single clonal isolate. The polyclonal format preserves genetic diversity while eliminating dysbindin expression, making it suitable for functional genomics and pharmacological studies.
The parental Raji cell line is an Epstein?CBarr virus (EBV)-immortalized B lymphocyte originally isolated from a Burkitt lymphoma patient. Raji cells are widely employed in immunological and cancer research for their ability to present antigens via major histocompatibility complex (MHC) class I and II molecules, secrete immunoglobulins, and undergo apoptosis in response to various stimuli. Their well-characterized lysosomal compartment and endocytic machinery make them an ideal host for dissecting membrane trafficking pathways relevant to both immune function and malignant transformation.
Dysbindin, encoded by DTNBP1, is a core component of the biogenesis of lysosome-related organelles complex 1 (BLOC-1). It directly interacts with dystrobrevin and all BLOC-1 subunits (BLOC1S1?CBLOC1S6) and functions cooperatively with the adaptor protein 3 (AP-3) complex to sort cargo proteins to lysosomes and related organelles. Dysbindin expression is regulated transcriptionally by TFEB downstream of mTORC1 nutrient sensing, and its disruption leads to mislocalization of lysosomal membrane proteins such as LAMP1 and LAMP2, as well as altered trafficking of synaptic vesicle proteins including SNAP-25 and synaptophysin in neuronal contexts. Consequently, DTNBP1 knockout impairs lysosome-related organelle biogenesis, endosomal sorting, and autophagy, with profound effects on intracellular protein homeostasis.
In the Raji B lymphocyte context, loss of dysbindin recapitulates cellular hallmarks of Hermansky-Pudlak syndrome type 7, including defective lysosomal enzyme activity and compromised MHC class II-dependent antigen presentation. This model provides a valuable tool for exploring the role of BLOC-1 in professional antigen-presenting cells, bridging innate and adaptive immunity. Furthermore, given the established genetic links between DTNBP1 and schizophrenia, the knockout enables investigation of neuroimmune interactions and lysosomal dysfunction in psychiatric disorders, where altered immune signaling is increasingly implicated.
Researchers can employ DTNBP1 Knockout Raji Polyclonal Cells in functional assays, including Western blotting for dysbindin and lysosomal markers, immunofluorescence for LAMP1/2 localization, flow cytometry of surface MHC I/II, and enzymatic assays for lysosomal hydrolases. Co-immunoprecipitation maps disrupted BLOC-1 complexes, and RNA-seq reveals transcriptomic changes. For detailed information or custom applications, please contact Ascent Research.
