The DTX1 Knockout HAP1 Polyclonal Cells provide a powerful loss-of-function model generated by CRISPR/Cas9-mediated disruption of the DTX1 gene in a near-haploid human cell background. This product comprises a polyclonal knockout cell population, enabling researchers to study the functional consequences of DTX1 ablation without clonal selection artifacts. The polyclonal format preserves genetic diversity and is particularly suited for pooled screening applications and robust phenotypic analyses. By eliminating DTX1 expression, this model allows direct interrogation of DTX1-dependent processes in a physiologically relevant human context.
HAP1 cells are an adherent, near-haploid human cell line derived from the chronic myeloid leukemia cell line KBM-7. Their haploid karyotype ensures that most genes are present in a single copy, simplifying knockout generation and minimizing confounding effects from wild-type alleles. This unique genetic background makes HAP1 a preferred platform for genetic perturbation studies, including CRISPR screens, protein interactomics, and signaling pathway dissection. The DTX1 knockout in HAP1 therefore offers a clean and tractable system for exploring DTX1 biology.
DTX1 encodes an E3 ubiquitin ligase that positively modulates Notch signaling by catalyzing ubiquitination of the Notch intracellular domain (NICD) following receptor activation by ligands such as Delta-like and Jagged. This non-proteolytic ubiquitination event promotes NICD stability and its assembly with the transcription factor RBPJ and co-activator MAML1 to drive expression of target genes like HES1. DTX1 also interacts with key regulators including EP300, DVL1, and ITCH, and is activated upstream by NOTCH1 and NOTCH2 cleavage upon TCR/CD3 stimulation and NFAT transcription factors. Downstream, DTX1-mediated ubiquitination influences JUN kinases and CBL, linking Notch signals to T-cell activation and B-cell development. Through these interactions, DTX1 serves as a critical node connecting the ubiquitin proteasome pathway to immune cell signaling.
The near-haploid nature of HAP1 cells amplifies the utility of DTX1 knockout by enabling unambiguous genotype-phenotype correlations. Without a second gene copy, the loss of DTX1 function yields homozygous-like phenotypic outcomes, facilitating the detection of subtle signaling alterations. Given HAP1’s hematopoietic origin, this model is well-suited for investigating DTX1’s roles in processes relevant to lymphoid and myeloid biology, despite HAP1 not being a T-cell line itself. Researchers can dissect how DTX1 loss affects Notch transcriptional activity, ubiquitination dynamics, and cross-talk with T-cell receptor signaling in a simplified, manipulable system.
This DTX1 knockout cell pool supports a wide array of experimental applications. Notch signaling fidelity can be assessed by Western blotting for full-length NOTCH1 and cleaved NICD, RT-qPCR for HES1 transcript levels, and luciferase reporter assays measuring NOTCH1/RBPJ/MAML1-driven transcription. The role of DTX1 in T-cell activation pathways can be probed by flow cytometric detection of markers such as CD69 and CD25 following pharmacological stimulation. Ubiquitination mechanisms are directly accessible via co-immunoprecipitation of NOTCH1 or its interactors under denaturing and native conditions. Cell proliferation and viability assays further enable functional profiling of downstream pathways. For detailed technical specifications or application guidance, please contact Ascent Research.
