The KCTD2 Knockout HEK293T Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal cell population in which the gene encoding potassium channel tetramerization domain containing 2 (KCTD2) has been disrupted. This gene-edited pool provides a heterogeneous loss-of-function model for investigating the roles of KCTD2 in ubiquitin-mediated regulation and receptor signaling. By employing this polyclonal knockout system, researchers can explore KCTD2-dependent molecular mechanisms without the confounding effects of residual gene expression, making it a valuable tool for functional studies and pathway dissection.
HEK293T cells are a well-characterized human embryonic kidney cell line derived from female fetal tissue and immortalized by sheared adenovirus 5 DNA. These cells are widely employed in biomedical research due to their high transfection efficiency, robust protein expression capacity, and constitutive expression of SV40 large T antigen, which facilitates episomal replication of plasmids containing the SV40 origin. Originally optimized for viral packaging and recombinant protein production, HEK293T cells also express core components of the ubiquitin-proteasome system and G protein signaling machinery, rendering them suitable for reconstitution and analysis of signaling pathways involving KCTD2.
KCTD2 functions as a substrate adaptor for cullin3-RING E3 ubiquitin ligase complexes (CUL3-RBX1), directly linking target proteins to the ubiquitination machinery. It is specifically implicated in the regulation of GABA-B receptor (GABBR1/GABBR2) signaling and trafficking. Upon activation of GABA-B receptors by ligands, KCTD2 is recruited to the receptor complex, promoting receptor ubiquitination and subsequent internalization. This process modulates downstream effectors, including G protein-coupled inwardly rectifying potassium (GIRK) channel gating, inhibition of adenylate cyclase, reduction of cAMP levels, and attenuation of CREB phosphorylation. KCTD2 is therefore positioned downstream of GABA-B receptor activation and neuronal activity, and interacts directly with CUL3 and RBX1, as well as the receptor subunits GABBR1 and GABBR2, to control synaptic inhibition and neuronal excitability.
Although HEK293T cells are of kidney origin rather than neuronal lineage, they constitute an ideal host for dissecting the intrinsic molecular functions of KCTD2. These cells lack endogenous expression of many neuron-specific factors, yet they possess intact ubiquitination machinery and can be engineered to express GABA-B receptor components and associated signaling intermediates. This allows for precise, reductionist analysis of KCTD2-mediated recruitment to the CUL3-RBX1 ligase complex and its effects on receptor fate without interference from endogenous KCTD2 or redundant adaptors. Polyclonal knockout populations avoid clonal artifacts and better represent the heterogeneity of genetic disruption, facilitating consistent functional readouts across experiments.
Typical applications include Western blotting to verify loss of KCTD2 protein, co-immunoprecipitation to assess interactions with CUL3 or GABA-B receptor subunits, and ubiquitination assays to quantify receptor modification. Downstream signaling can be interrogated via cAMP assays, CREB reporter assays, and electrophysiological recordings when heterologously expressed receptors are reconstituted. The model is suitable for high-throughput genetic screening, ubiquitination pathway analysis, and drug target validation in the context of neurodevelopmental disorders, including autism spectrum disorder and epilepsy. For ordering and technical inquiries, please contact Ascent Research.
