The CASP7 Knockout MES-OV Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal population of MES-OV mouse embryonic stem (ES) cells in which the Casp7 gene has been disrupted to eliminate functional caspase-7 expression. This loss-of-function model enables precise dissection of executioner caspase biology without the confounding effects of residual target gene activity. The polyclonal format provides a heterogeneous mixture of edited cells, allowing user-level clonal selection or pooled functional assays, making it a flexible tool for apoptosis and stem cell research.
MES-OV cells are pluripotent ES cells derived from the 129/Sv mouse strain, capable of self-renewal and differentiation into derivatives of all three germ layers??ectoderm, mesoderm, and endoderm. These cells retain a normal karyotype and robust developmental potential, making them ideal for in vitro modeling of early embryogenesis and lineage commitment. Their genetic background is well-characterized, facilitating integration with existing data from transgenic and knockout mouse models, particularly those employing the 129/Sv strain.
Caspase-7 is an executioner caspase that operates downstream of initiator caspases??caspase-8 (extrinsic pathway) and caspase-9 (intrinsic pathway)??as well as caspase-10 and granzyme B, and is activated by proteolytic cleavage. Upon activation, caspase-7 cleaves critical substrates including PARP1 (poly(ADP-ribose) polymerase 1), the nuclear lamina component LMNA, DNA fragmentation factor DFFA, Rho-associated kinase ROCK1, and gasdermin D GSDMD, thereby dismantling cellular architecture and enforcing apoptotic cell death. Caspase-7 activity is modulated by inhibitor of apoptosis proteins XIAP, cIAP1, and cIAP2, and it interacts within the apoptosome with Apaf-1 and cytochrome c. In the broader pathway, caspase-7 functions alongside caspase-3 and caspase-6 downstream of BAX/BCL2-driven mitochondrial outer membrane permeabilization. In stem cells, caspase-7 also exhibits non-apoptotic roles, potentially influencing lineage commitment, differentiation, and cell cycle progression through selective proteolysis of regulatory proteins.
Ablation of Casp7 in the MES-OV background offers a powerful system to uncouple the canonical and non-canonical functions of this executioner caspase in a pluripotent context. Without caspase-7, cells may display impaired execution of apoptosis, allowing researchers to evaluate the relative contributions of caspase-3 and caspase-7 to cell death programs and to identify caspase-7-specific substrates. Additionally, disruption of caspase-7 can alter differentiation trajectories, as caspase-mediated cleavage of factors like PAK2 or ROCK1 may modulate cell fate decisions. This model is thus instrumental for probing the interplay between apoptosis, pluripotency maintenance, and embryonic development, and has direct implications for understanding how dysregulated caspase activity contributes to cancer, neurodegenerative disorders, and autoimmune diseases.
Researchers can employ these polyclonal knockout cells in a broad array of experimental settings, including western blotting for caspase-7 and its substrates to confirm gene disruption, annexin V apoptosis assays to quantify cell death susceptibility, TUNEL staining to detect DNA fragmentation, and embryoid body differentiation assays to monitor lineage commitment in the absence of caspase-7. Additional applications encompass RT-qPCR for pluripotency markers (e.g., Oct4, Nanog), caspase-7 activity measurements using fluorogenic substrates, and flow cytometric cell cycle analysis to assess non-apoptotic roles. The cells are suitable for drug sensitivity screens, mechanistic studies of intrinsic and extrinsic apoptosis pathways, inflammasome signaling research, and developmental biology investigations. For technical guidance or to explore custom modifications, please contact Ascent Research.
