KCTD3 Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the KCTD3 gene in the HAP1 near-haploid human cell line. This product provides a loss-of-function model for investigating the biological roles of KCTD3. The polyclonal knockout pool contains a heterogeneous mixture of edited alleles, offering a robust system to interrogate gene function without clonal artifacts. The CRISPR-mediated gene disruption enables efficient ablation of KCTD3 expression, facilitating studies on its role in protein ubiquitination and related pathways.
The HAP1 cell line is a near-haploid human cell line derived from the KBM-7 chronic myeloid leukemia line. With a fibroblast-like morphology and adapted to suspension culture, HAP1 cells are widely employed in genetic loss-of-function screens and drug target validation. Their near-haploid karyotype simplifies gene editing and phenotypic analysis, as each cell contains a single allele for most genes, eliminating complexities from heterozygosity. This makes HAP1 an ideal host for CRISPR-based knockout studies, particularly in the context of the ubiquitin-proteasome system and cellular stress responses.
KCTD3 encodes a substrate-specific adaptor for the cullin-3 RING E3 ubiquitin ligase complex. Within this complex, KCTD3 interacts with CUL3 and RBX1 to recruit target proteins, notably HDAC4, for polyubiquitination and subsequent degradation by the 26S proteasome. This process is critical for maintaining protein quality control and regulating gene expression. KCTD3 activity is modulated by cellular stress signals, and dysfunction of this pathway has been linked to neurodevelopmental disorders, epilepsy, and certain cancers. The KCTD3?CCUL3?CHDAC4 axis thus represents a key node in ubiquitin-dependent protein homeostasis.
In the HAP1 cellular background, knockout of KCTD3 disrupts the CUL3-RING E3 ligase adaptor function, leading to stabilization of downstream substrates such as HDAC4. This allows researchers to directly assess the impact on protein degradation kinetics, transcriptional regulation, and cellular responses to stress. The near-haploid nature of HAP1 cells ensures that a single targeting event is sufficient to abolish gene function, avoiding compensatory effects often seen in diploid cell lines. Consequently, this model provides a clean and efficient system for dissecting KCTD3-dependent ubiquitination events and their consequences on cell physiology.
Researchers can employ KCTD3 Knockout HAP1 Polyclonal Cells in a variety of experimental settings, including western blotting for HDAC4 accumulation, ubiquitination assays to monitor substrate modification, proteasome activity assays, RT-qPCR for downstream gene expression changes, immunofluorescence, flow cytometry, and cell proliferation assays. These tools facilitate functional genomics studies, investigation of the ubiquitin-proteasome system, modeling of neurodevelopmental disorders, drug target validation, and protein degradation pathway screening. The polyclonal knockout population reduces clonal bias and is suitable for high-throughput applications. For additional information or technical support, please contact Ascent Research.
