The KNSTRN Knockout HT29 Polyclonal Cells represent a genetically modified cell population generated by CRISPR/Cas9-mediated disruption of the KNSTRN gene in the HT29 human colorectal adenocarcinoma cell line. This polyclonal knockout pool provides a powerful loss-of-function model for investigating the roles of the kinetochore-associated protein KNSTRN in mitotic regulation and chromosome segregation.
The parental HT29 cell line is a well-characterized epithelial model derived from a human colorectal adenocarcinoma, harboring mutations in the APC and TP53 tumor suppressor genes. These cells are extensively utilized for studying intestinal epithelial biology, colorectal cancer pathogenesis, and epithelial barrier function due to their ability to form polarized monolayers and their relevance to colorectal tumorigenesis.
KNSTRN encodes a kinetochore-localized protein that functions as a critical mediator of chromosome alignment and faithful mitotic segregation. It directly interacts with the spindle-associated protein astrin (SPAG5) and facilitates its recruitment to kinetochores, thereby stabilizing microtubule-kinetochore attachments. KNSTRN operates within the mitotic spindle assembly checkpoint (SAC) pathway, interacting with components such as BUB1, CENP-E, and the dynein-dynactin complex. Its activity is regulated by upstream factors including E2F transcription factors, Aurora B kinase, and the CDK1/cyclin B complex. Loss of KNSTRN disrupts astrin localization, impairs SAC signaling, and leads to chromosome missegregation and aneuploidy, engaging downstream effectors like BUBR1, MAD2, and the APC/C ubiquitin ligase.
Introduction of KNSTRN knockout into the HT29 background, which already exhibits chromosomal instability due to APC and TP53 mutations, establishes a synergistic model for studying exacerbated mitotic defects and aneuploidy in colorectal cancer. This polyclonal population enables the analysis of how compromised kinetochore-microtubule interactions contribute to tumor cell heterogeneity and drug resistance. The model is particularly suited for evaluating the functional consequences of KNSTRN loss in a disease-relevant environment where mitotic fidelity is frequently dysregulated.
Researchers can employ this knockout population in a variety of experimental paradigms, including immunofluorescence microscopy to assess chromosome alignment and spindle morphology, live-cell imaging to track mitotic progression, and flow cytometry for DNA content analysis and ploidy profiling. Additional applications include western blotting to confirm KNSTRN and astrin protein levels, colony formation assays to evaluate clonogenic survival, and cell viability screens with mitotic inhibitors such as Aurora B or CDK1 antagonists. This product is thus a valuable tool for dissecting kinetochore biology and chromosomal instability in colorectal cancer. For further technical information, please contact Ascent Research.
