KNSTRN Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the KNSTRN gene in the near-haploid HAP1 human cell line. This loss-of-function model enables investigation of kinetochore and spindle assembly functions without relying on single-cell clones, facilitating pooled functional genomics screens and broader phenotypic analyses.
The HAP1 cell line, derived from the chronic myeloid leukemia KBM-7 line, is a widely used near-haploid human model that simplifies genetic manipulation and screening due to its haploid genome. This background makes it particularly suitable for studying mitosis and cell cycle regulation, as well as for conducting drug sensitivity assays in a leukemia-relevant context.
KNSTRN encodes a kinetochore-localized protein that serves as a scaffold for the astrin/SPAG5 complex, critical for stabilizing kinetochore-microtubule attachments and ensuring accurate chromosome alignment. Its function is tightly regulated by Aurora B kinase phosphorylation, which modulates kinetochore?Cmicrotubule dynamics during spindle assembly checkpoint signaling. Upstream regulators include the FOXM1 transcription factor and CDK1-cyclin B, while KNSTRN interacts with components of the NDC80 complex (NUF2, SPC24, SPC25) and Polo-like kinase 1 (PLK1) to orchestrate mitotic progression.
In the HAP1 background, KNSTRN disruption is expected to impair mitotic fidelity, leading to chromosome misalignment, spindle assembly checkpoint activation, and potential genomic instability. This phenotype is particularly relevant for cancer biology research, as KNSTRN mutations have been linked to squamous cell and basal cell carcinomas, and Aurora B kinase pathway inhibitors are under investigation as therapeutic agents. The polyclonal knockout population allows detection of cell-autonomous mitotic defects without the clonal selection artifacts that may mask heterogeneous responses.
Typical applications include functional genomics screens for synthetic lethal interactions, high-content live-cell imaging of chromosome dynamics, flow cytometric cell cycle profiling, and immunofluorescence analysis of mitotic spindle defects. The cells can be used to validate KNSTRN as a drug target, evaluate Aurora kinase inhibitor sensitivity via colony formation assays, and investigate spindle assembly checkpoint mechanisms. Researchers may also perform rescue experiments to dissect domain-specific functions of KNSTRN. For further information, please contact Ascent Research.
