The CASP9 Knockout HAP1 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population designed for functional studies of the CASP9 gene. This product comprises a pool of HAP1 cells carrying targeted disruptions of the CASP9 locus, generated through CRISPR/Cas9-mediated gene disruption, resulting in a heterogeneous loss-of-function model. Unlike clonal cell lines, the polyclonal format captures a diverse spectrum of genetic perturbations, offering a robust system for studying gene function while mitigating clone-specific artifacts. The cells are provided as a ready-to-use polyclonal population, facilitating direct incorporation into apoptosis research, genetic screening, and drug discovery workflows.
The HAP1 cell line is a near-haploid human cell line derived from the KBM-7 chronic myeloid leukemia background, which provides a unique genetic platform for knockout studies due to its predominantly single-copy genome. This haploid state significantly simplifies CRISPR/Cas9-mediated disruption, as targeting a single allele is often sufficient to produce functional gene knockout, enhancing the efficiency of loss-of-function modeling. HAP1 cells retain key cellular pathways and are widely employed in genetic screens, cancer biology, and functional genomics, making them an ideal host for interrogating genes involved in cell death and survival mechanisms.
CASP9 encodes caspase-9, the critical initiator caspase of the intrinsic apoptotic pathway. Upon intrinsic apoptotic stimuli, caspase-9 is recruited to the apoptosome complex, where it binds APAF1 in the presence of cytochrome c released from mitochondria, leading to its dimerization and activation. Active caspase-9 subsequently cleaves and activates executioner caspases CASP3 and CASP7, orchestrating cellular demolition. Upstream regulators such as BAX, BAK, and p53 promote mitochondrial outer membrane permeabilization, while XIAP and SMAC/DIABLO modulate caspase-9 activity through inhibition or de-repression. Downstream targets including PARP1, ICAD, and ROCK1 link caspase-9 to DNA repair inhibition, chromatin condensation, and cytoskeletal reorganization.
In the HAP1 background, CASP9 knockout provides a powerful tool for dissecting the intrinsic apoptotic pathway and evaluating therapeutics. The haploid genome allows unambiguous study of caspase-9 function without allelic redundancy, making it ideal for genetic interaction screens and high-throughput compound testing. This model enables investigation of caspase-9’s role in cell death induced by chemotherapeutics, DNA damage, or growth factor withdrawal, and exploration of crosstalk with p53 signaling and mitochondrial dynamics.
Applications include functional genomics studies, cancer drug screening, and neurodegenerative disease modeling. Key assays involve caspase-3/7 activity measurements, cytochrome c release detection, PARP1 cleavage analysis via western blotting, and flow cytometry with Annexin V/PI staining. The polyclonal population supports pooled CRISPR screens, RT-qPCR for downstream targets, and immunofluorescence of apoptosome formation. For further technical details or to discuss custom applications, please contact Ascent Research.
