KALRN Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-edited polyclonal cell population with targeted disruption of the human KALRN gene. Engineered in the widely used HEK293T cell line, this product provides a heterogeneous pool of KALRN-deficient cells for studying loss-of-function phenotypes. The polyclonal nature ensures representation of diverse editing outcomes, offering a robust system for functional genomics and drug discovery applications.
HEK293T cells are a derivative of the HEK293 line, originally generated by adenovirus 5 transformation of human embryonic kidney cells. They stably express the SV40 large T antigen, which facilitates episomal replication of plasmids containing the SV40 origin of replication, resulting in high-level transient protein expression. This cell line is a mainstay for recombinant protein production, lentiviral packaging, and biochemical analysis due to its robust transfection efficiency and well-characterized proteome.
KALRN encodes multiple protein isoforms that share RhoGEF, spectrin repeat, and serine/threonine kinase domains. The best-characterized isoforms function as guanine nucleotide exchange factors (GEFs) for the small GTPases Rac1, RhoA, and RhoG. Activated by upstream neurotrophin signals such as BDNF/TrkB, Neuregulin/ErbB, and EphB receptors, Kalirin catalyzes GTP loading onto Rac1, RhoA, or RhoG, thereby promoting activation cascades involving PAK1/3 and LIM kinase, which culminate in cofilin phosphorylation and actin polymerization. Through these pathways, Kalirin critically controls dendritic spine morphogenesis, synaptic plasticity, and cytoskeletal remodeling. Kalirin also physically interacts with synaptic scaffolding proteins including PSD-95/DLG4, DISC1, and ErbB4, positioning it at key nodes of structural and signaling plasticity. Thus, disruption of KALRN perturbs Rho GTPase-driven actin dynamics and downstream neuronal architecture.
Although Kalirin is predominantly studied in neuronal contexts, HEK293T cells provide a simplified, genetically manipulable platform to dissect Kalirin??s role in fundamental Rho GTPase signaling. KALRN knockout in HEK293T cells disrupts the upstream signaling axis from growth factor receptors (e.g., TrkB, ErbB) to Rac1/RhoA/RhoG effectors, allowing quantitative analysis of GTPase activation, actin remodeling, and downstream kinase phosphorylation. The high transfection efficiency of HEK293T cells further facilitates rescue experiments and structure-function studies of Kalirin isoforms. Consequently, this model serves as a valuable complement to neuronal systems for biochemical and pharmacological interrogation of the KALRN signaling network.
Applications of KALRN Knockout HEK293T Polyclonal Cells include investigating synaptic plasticity mechanisms, modeling neurodevelopmental disorders such as schizophrenia and autism spectrum disorder, functional studies of Rho GTPase signaling, and high-throughput screening for modulators of spinogenesis. Typical assays employ western blotting and RT-qPCR to confirm gene disruption and downstream target expression, Rac1-GTP pull-down assays to directly measure Kalirin-dependent GTPase activation, and immunofluorescence with phalloidin to visualize actin cytoskeleton dynamics. Co-immunoprecipitation with antibodies targeting PSD-95 or DISC1 can map Kalirin interactome alterations, while phospho-PAK/LIMK analysis quantifies pathway output. This polyclonal knockout cell population, combined with HEK293T??s high transfection capability, enables systematic dissection of KALRN-dependent signaling circuits and drug target validation. For further details, please contact Ascent Research.
