The DKK1 Knockout HCT 116 Polyclonal Cells product comprises a CRISPR/Cas9-edited polyclonal population of HCT 116 human colorectal carcinoma cells harboring targeted disruption of the DKK1 gene. This knockout pool retains the inherent heterogeneity of polyclonal editing, offering a genetically diverse loss-of-function model for studying DKK1-dependent signaling processes. The knockout population eliminates expression of the secreted Wnt antagonist Dickkopf-related protein 1 (DKK1), thereby relieving its inhibitory constraints on Wnt/??-catenin and associated pathways.
HCT 116 is a widely employed human colorectal carcinoma epithelial cell line derived from a male colorectal adenocarcinoma. These cells harbor a heterozygous deletion of serine 45 in the CTNNB1 gene (S45del), which stabilizes ??-catenin and drives constitutive TCF/LEF-mediated transcription independent of Wnt ligand stimulation. This genetic background makes HCT 116 a foundational model for investigating canonical Wnt/??-catenin signaling, tumor cell proliferation, and oncogenic transformation in colorectal cancer.
DKK1 functions as a high-affinity antagonist by forming a ternary complex with LRP5/6 co-receptors and Kremen1/2 transmembrane proteins, triggering clathrin-mediated endocytosis and removal of LRP5/6 from the cell surface, thereby impeding Wnt?CFrizzled?CLRP5/6 signalosome assembly. This activity suppresses ??-catenin stabilization and TCF/LEF-dependent transcription of target genes such as MYC, CCND1, and AXIN2. DKK1 expression is itself regulated by TCF/LEF, p53, and BMP-2, and it reciprocally modulates BMP and TGF-?? signaling. In parallel, DKK1 influences non-canonical Wnt/PCP outputs through its interactions with Wnt ligands and Dishevelled family members.
In HCT 116 cells, the S45del CTNNB1 mutation partially uncouples ??-catenin signaling from upstream Wnt ligand input; however, DKK1-mediated feedback inhibition still operates on residual ligand-dependent nuances and non-canonical branches. Disruption of DKK1 in this background eliminates a critical endogenous brake, potentially augmenting TCF/LEF transcriptional activity and altering the balance between canonical and non-canonical Wnt signaling. The knockout model may exhibit altered expression of direct ??-catenin targets like MYC and AXIN2, and altered activation of JNK cascades downstream of planar cell polarity components, providing a tool to dissect Wnt pathway crosstalk in a mutationally defined colorectal cancer context.
This polyclonal DKK1 knockout cell pool is suited for a broad range of experimental applications, including Wnt pathway reporter assays (TOPFlash/FOPFlash), RT-qPCR profiling of downstream targets (AXIN2, MYC, CCND1), and Western blot analysis of ??-catenin stabilization and c-MYC induction. Researchers can employ the model in drug screening campaigns for novel Wnt inhibitors, in co-culture systems examining tumor?Cstroma interactions, or in functional assays measuring clonogenic growth, Transwell migration, and apoptosis. Additionally, DKK1??s role in osteolytic bone disease and stem cell differentiation makes this knockout resource valuable for investigating metastatic colonization and developmental signaling. For detailed technical support and custom requests, please contact Ascent Research.
