The KCTD5 Knockout HEK293T Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal population derived from HEK293T cells, offering a loss-of-function model for the KCTD5 gene. This pool of cells carries targeted gene disruption at the endogenous KCTD5 locus, eliminating functional adaptor protein expression and enabling investigation of its role in ubiquitin-mediated degradation and signaling regulation. The polyclonal format provides a heterogeneous editing landscape suitable for studying population-level effects.
The HEK293T cell line is a highly transfectable human embryonic kidney epithelial line immortalized by adenovirus type 5 transformation and stable SV40 large T antigen expression. This enables episomal plasmid amplification and robust heterologous protein production. Widely used for viral packaging and signaling studies, HEK293T cells provide a well-characterized background for investigating ubiquitin-proteasome pathway components and GPCR/Wnt signaling dynamics.
KCTD5 serves as a substrate adaptor for the cullin3-RING E3 ubiquitin ligase complex, which includes Cullin3, Rbx1, and ubiquitin-conjugating enzyme E2. It recruits targets such as G protein beta-gamma subunits and GPCRs for polyubiquitination and proteasomal degradation, thereby negatively regulating signal output. This mechanism dampens both Wnt signaling??by affecting the stability of pathway components downstream of Frizzled receptors??and GPCR-responsive cascades. KCTD5 links the ubiquitin-proteasome system to the control of these pathways, modulating ??-catenin-dependent transcription and G protein availability.
In HEK293T cells, loss of KCTD5 disrupts this regulatory node, leading to altered signal responsiveness and protein half-lives. The polyclonal knockout population is ideal for complementation assays, where reintroduction of wild-type or mutant KCTD5 permits dissection of functional domains. Given the endogenous expression of Wnt ligands, Frizzled receptors, and multiple GPCRs, this model recapitulates relevant signaling contexts. It is valuable for exploring how ubiquitin-mediated degradation influences proliferation and differentiation, with implications for cancer and neurodevelopmental disorders.
Applications include functional characterization using western blotting and co-immunoprecipitation to assess complex formation, ubiquitination assays to measure substrate degradation, and luciferase-based Wnt reporter assays to quantify transcriptional output. Flow cytometry and immunofluorescence enable surface GPCR analysis. The model further supports drug target validation and cell proliferation studies. For more information, contact Ascent Research.
