The GSKIP Knockout HT29 Polyclonal Cells product comprises a population of CRISPR/Cas9-edited polyclonal knockout cells engineered to disrupt the GSKIP gene in a human HT29 colorectal adenocarcinoma background. This polyclonal pool offers a heterogeneous loss-of-function model suitable for population-level studies of GSKIP-dependent signaling without clonal selection artifacts. The gene editing generates a functional knockout by introducing genetic alterations that abrogate GSKIP protein expression, providing researchers with a physiologically relevant system to interrogate GSKIP’s role in oncogenic pathways.
HT29 is a well-characterized human colorectal adenocarcinoma cell line displaying epithelial morphology and harboring mutations in APC and TP53, which render it dependent on constitutive Wnt/??-catenin signaling for proliferation and survival. As a widely employed model in cancer biology, HT29 cells are particularly suited for dissecting mechanisms that regulate the Wnt cascade, making them an ideal host for targeted disruption of GSKIP, a critical modulator of this pathway.
GSKIP (GSK3??-interacting protein) functions as a negative regulator of glycogen synthase kinase 3?? (GSK3??), directly binding and inhibiting its kinase activity. This interaction promotes ??-catenin stabilization and nuclear accumulation, where ??-catenin partners with TCF/LEF transcription factors to induce oncogenic targets like c-Myc and cyclin D1. GSKIP activity is modulated by Wnt3a, which through Frizzled and Dishevelled, and the destruction complex (Axin, APC, GSK3??) regulates ??-catenin degradation; AKT1 also phosphorylates GSK3??, integrating PI3K/AKT signals. Thus, GSKIP connects Wnt/??-catenin, PI3K/AKT, and cell cycle pathways.
In HT29 cells, knockout of GSKIP relieves its inhibitory constraint on GSK3??, leading to heightened GSK3?? kinase activity and amplified phosphorylation-dependent degradation of ??-catenin. This disrupts the constitutive Wnt signaling that HT29 cells rely on, resulting in reduced expression of ??-catenin/TCF target genes and attenuated cell cycle progression. Consequently, this polyclonal knockout model serves as a powerful tool to mechanistically dissect the contribution of GSKIP to colon cancer cell proliferation, survival, and oxidative stress responses. The model is also relevant for evaluating the interplay between GSKIP and other regulatory inputs, such as AKT1 signaling, in a colorectal adenocarcinoma context.
This polyclonal knockout pool is suited for diverse functional assays: Western blotting for GSK3?? and ??-catenin, MTT/BrdU proliferation assays, and Annexin V-based apoptosis detection. Wnt transcriptional activity can be measured via TOPFlash luciferase reporter assays and RT-qPCR of target genes such as MYC and CCND1. Colony formation assays and high-throughput screening of GSK3?? modulators or Wnt inhibitors are also applicable, supporting cancer biology and drug discovery research. For further details or to order, please contact Ascent Research.
