The CASP9 Knockout HEK293T Polyclonal Cells product is a CRISPR/Cas9-edited polyclonal knockout cell population with targeted disruption of the human CASP9 gene. This mixed HEK293T population enables loss-of-function studies of caspase-9 in the intrinsic apoptotic pathway without clonal selection, providing a genetically heterogeneous model for functional genomics and drug discovery.
HEK293T cells are human embryonic kidney epithelial cells stably expressing SV40 large T antigen, which facilitates episomal replication and high-titer lentivirus production. Their high transfectability, robust growth, and extensive characterization make them an optimal host for CRISPR-based gene editing and downstream phenotypic assays. The cell line is a versatile platform for studying signaling pathways due to its well-mapped genome and reliable response in functional experiments.
CASP9 encodes caspase-9, the initiator caspase of the intrinsic mitochondrial apoptotic pathway. Upon cellular stress, mitochondrial outer membrane permeabilization regulated by BCL2 family proteins (BAX, BAK, BCL2) triggers cytochrome c release, which binds APAF1 to form the apoptosome. This complex activates caspase-9, which then cleaves executioner caspases-3 and -7, executing apoptosis. Caspase-9 activity is modulated by XIAP inhibition and HSP70 interactions. The p53 tumor suppressor links DNA damage to caspase-9 activation by transcriptionally upregulating pro-apoptotic BCL2 factors, positioning CASP9 as a central node in apoptosis signaling.
Disruption of CASP9 in HEK293T cells enables dissection of p53-independent apoptotic mechanisms, as the SV40 large T antigen binds and inhibits p53, thereby suppressing p53-mediated cell death. This makes it an ideal context for analyzing the intrinsic mitochondrial pathway without interference from the p53 axis. The polyclonal nature of the knockout population captures a spectrum of gene-editing events, providing a heterogeneous system that mimics biological variability and is suitable for high-throughput pooled screens and bulk assays where clonal homogeneity is not desired.
This CASP9 knockout polyclonal HEK293T product is ideally suited for applications in apoptosis research, including high-throughput screening of pro-apoptotic and anti-apoptotic compounds, mechanistic studies of caspase-9-dependent cell death in cancer, and delineation of signaling networks downstream of mitochondrial permeabilization. Researchers can validate knockout and assess function using Western blotting for caspase-9 cleavage, fluorometric caspase activity assays, annexin V/PI flow cytometry for apoptosis quantification, and cell viability assays such as MTT. Genomic PCR and RT-qPCR provide additional confirmation of gene disruption and downstream transcriptional effects. For further information, please contact Ascent Research.
