{"gene":"CASP7","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":1995,"finding":"CASP7 (Mch3/CMH-1) is synthesized as a proenzyme that undergoes autocatalytic/autoactivation processing into two subunits (p20 and p12); the active enzyme cleaves PARP and has substrate specificity toward DEVD-AMC similar to CPP32/CASP3.","method":"Bacterial recombinant expression, in vitro protease activity assay, autocatalytic processing demonstrated by SDS-PAGE","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with enzymatic assay, multiple substrates tested, replicated by independent labs","pmids":["8521391"],"is_preprint":false},{"year":1995,"finding":"CPP32/CASP3 can cleave proCASP7 (proMch3α) to generate active CASP7, but CASP7 cannot efficiently cleave proCASP3, establishing a unidirectional activation relationship; additionally, the p17 subunit of CASP3 can form an active heteromeric complex with the p12 subunit of CASP7.","method":"Recombinant protein co-expression in Sf9 cells, cross-cleavage assay, apoptosis induction assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1 — reconstituted heteromeric complex with functional apoptosis readout, supported by cleavage assays","pmids":["8521391"],"is_preprint":false},{"year":1996,"finding":"Granzyme B directly cleaves and activates CASP7 (ICE-LAP3/Mch3/CMH-1) at Asp198-Ser199 (between p20 and p12 subunits); autocatalytic cleavage at the prosequence site (Asp23-Ala24) is not required for CASP7 activity in vitro.","method":"In vitro cleavage assay with purified granzyme B and recombinant CMH-1/CASP7; site-specific cleavage mapped by N-terminal sequencing","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with precise cleavage site mapping, replicated across multiple labs","pmids":["8631895","8805307","8576161"],"is_preprint":false},{"year":1996,"finding":"CASP7 (ICE-LAP3) is activated during Fas- and TNF-induced apoptosis; endogenous CASP7 is processed to its subunit forms upon receipt of a death stimulus, and overexpression of a truncated (pro-domain-deleted) form induces apoptosis in MCF7 cells.","method":"Western blot of endogenous CASP7 processing; overexpression of truncated CASP7 in MCF7 cells with apoptosis readout","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — direct demonstration of endogenous processing during physiological apoptosis plus functional overexpression assay","pmids":["8576161"],"is_preprint":false},{"year":1996,"finding":"CASP7 (ICE-LAP3) is localized to the cytoplasm as a 35-kDa proenzyme in multiple tissues and cell lines.","method":"Subcellular fractionation and immunocytochemistry","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment, single paper","pmids":["8576161"],"is_preprint":false},{"year":1996,"finding":"Granzyme B activates endogenous CASP7 (ICE-LAP3) in Jurkat T cells treated with granzyme B plus sublytic perforin, preceding apoptosis, placing CASP7 downstream of granzyme B in CTL/NK-mediated cytotoxicity.","method":"Cell-based apoptosis assay with granzyme B and perforin; Western blot of endogenous CASP7 processing","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 — epistasis in cell-based system with endogenous protein detection, replicated across multiple labs","pmids":["8805307"],"is_preprint":false},{"year":1996,"finding":"CASP7 (Mch3) is activated by Mch4/CASP10 in vitro; Mch4 cleaves proMch3 at a conserved IXXD-S sequence to produce the large and small subunits of active CASP7, establishing CASP7 as a downstream target of initiator caspase Mch4.","method":"In vitro cleavage assay with recombinant Mch4 and recombinant proCASP7; SDS-PAGE analysis of processing","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with defined cleavage site, replicated across multiple studies","pmids":["8755496"],"is_preprint":false},{"year":1996,"finding":"CASP7 (Mch3) is cleaved by granzyme B at a conserved IXXD-A processing sequence, analogous to CPP32 processing, placing CASP7 in the granzyme B apoptotic pathway.","method":"In vitro cleavage assay with recombinant granzyme B and proMch3/proCASP7","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution, consistent with independent findings from multiple labs","pmids":["8755496"],"is_preprint":false},{"year":1997,"finding":"CASP7 (Mch3α/CPP32) activation occurs downstream of p53-induced apoptosis, accompanied by cleavage of PARP and lamin B1, placing CASP7 as an effector protease in the p53 apoptotic pathway.","method":"Temperature-sensitive p53 cell line (LTR6); Western blot of CASP7 processing and substrate cleavage","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis using inducible p53 system with defined biochemical readouts, single lab","pmids":["9078237"],"is_preprint":false},{"year":2025,"finding":"XIAP binds CASP7 via its linker-BIR2 domain to inhibit CASP7; a small molecule inhibitor (643943) binds CASP7 at Asp93, releases the XIAP linker-BIR2 domain, and reactivates CASP7, selectively killing CASP3-deficient (CASP3/DR) cancer cells; mutation of Asp93 on CASP7 abolishes inhibitor cytotoxicity.","method":"Virtual screening, in vitro binding assay, site-directed mutagenesis (Asp93 substitution), cell viability assay in MCF-7 and TNBC lines, in vivo xenograft","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis validates binding mode, multiple orthogonal methods including in vitro and in vivo","pmids":["40533441"],"is_preprint":false},{"year":2023,"finding":"miR-212-5p directly targets the CASP7 3'UTR (validated by dual-luciferase assay), and lncfos suppresses miR-212-5p, forming a lncfos/miR-212-5p/CASP7 regulatory axis; upregulation of miR-212-5p reduces CASP7 expression and neuronal apoptosis in a rat MCAO ischemic stroke model.","method":"Dual-luciferase reporter assay for miR-212-5p binding to CASP7 3'UTR; intracerebroventricular injection of miR-212-5p agomir/antagomir and sh-fos in rat MCAO model; qRT-PCR, infarct volume, neurological scoring","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 — luciferase validation plus in vivo functional rescue, single lab","pmids":["36715920"],"is_preprint":false}],"current_model":"CASP7 (caspase-7) is an effector cysteine protease synthesized as a cytoplasmic proenzyme that is proteolytically activated by upstream initiator caspases (granzyme B, Mch4/CASP10, and CASP3) through cleavage at conserved aspartate sites, yielding an active heterodimeric enzyme that cleaves PARP and other apoptotic substrates; its activity is inhibited by XIAP binding to its linker-BIR2 domain, and it is transcriptionally regulated by miRNAs including miR-212-5p targeting its 3'UTR."},"narrative":{"teleology":[{"year":1995,"claim":"Identification of CASP7 as a DEVD-cleaving executioner caspase resolved the question of whether additional CPP32-like proteases exist and established that CASP7 autocatalytically processes into p20/p12 subunits with PARP-cleaving activity indistinguishable from CASP3.","evidence":"Recombinant expression in bacteria, in vitro protease activity assays with DEVD-AMC and PARP substrates, SDS-PAGE of processing products","pmids":["8521391"],"confidence":"High","gaps":["Whether CASP7 has unique substrates distinct from CASP3 remained unknown","In vivo role versus CASP3 not addressed","Crystal structure not yet available"]},{"year":1995,"claim":"Demonstration that CASP3 cleaves proCASP7 but not vice versa, and that CASP3-p17/CASP7-p12 heteromers are enzymatically active, established the hierarchical and cooperative relationship between the two executioner caspases.","evidence":"Recombinant cross-cleavage assays and heteromeric complex reconstitution in Sf9 cells with apoptosis readout","pmids":["8521391"],"confidence":"High","gaps":["Physiological relevance of CASP3/CASP7 heteromers in cells not demonstrated","Whether other caspases can also activate CASP7 was unknown"]},{"year":1996,"claim":"Mapping of granzyme B and initiator caspase (CASP10/Mch4) cleavage sites on proCASP7 placed CASP7 firmly in both the CTL/NK cytotoxicity and death-receptor apoptotic cascades, answering how CASP7 is activated upstream.","evidence":"In vitro reconstitution with purified granzyme B and recombinant CASP10; N-terminal sequencing of cleavage products; cell-based assay with granzyme B plus perforin in Jurkat cells","pmids":["8631895","8805307","8755496","8576161"],"confidence":"High","gaps":["Whether CASP8 or CASP9 directly activate CASP7 was not tested","Relative contribution of granzyme B versus caspase-mediated activation in vivo unresolved"]},{"year":1996,"claim":"Demonstration that endogenous CASP7 is processed during Fas- and TNF-induced apoptosis, and that its overexpression induces apoptosis, confirmed CASP7 as a physiological effector caspase rather than a biochemical curiosity.","evidence":"Western blot of endogenous CASP7 processing in Fas/TNF-stimulated cells; overexpression of truncated CASP7 in MCF7 cells; subcellular fractionation showing cytoplasmic localization","pmids":["8576161"],"confidence":"High","gaps":["Non-apoptotic functions of CASP7 not explored","Tissue-specific roles not addressed"]},{"year":1997,"claim":"Placing CASP7 activation downstream of p53 induction expanded the known apoptotic contexts of CASP7 beyond death receptors and granzyme B to include intrinsic/genotoxic stress pathways.","evidence":"Temperature-sensitive p53 cell line with Western blot detection of CASP7 processing and PARP/lamin B1 cleavage","pmids":["9078237"],"confidence":"Medium","gaps":["Whether p53-mediated activation proceeds through mitochondrial caspase-9 or another route not determined","Single cell system used"]},{"year":2023,"claim":"Identification of miR-212-5p as a direct post-transcriptional repressor of CASP7 via its 3′UTR, within a lncfos/miR-212-5p/CASP7 axis, revealed a non-caspase regulatory layer controlling CASP7 expression in neuronal ischemia.","evidence":"Dual-luciferase reporter assay validating miR-212-5p binding to CASP7 3′UTR; in vivo agomir/antagomir experiments in rat MCAO stroke model","pmids":["36715920"],"confidence":"Medium","gaps":["Whether this axis operates outside the CNS is unknown","Endogenous CASP7 protein levels not confirmed by Western blot in all conditions","Single lab finding"]},{"year":2025,"claim":"Structural and pharmacological dissection of the XIAP-CASP7 inhibitory interaction revealed that XIAP linker-BIR2 engages CASP7 at Asp93, and that a small molecule disrupting this interface selectively reactivates CASP7 in CASP3-deficient cancers, establishing CASP7 as a druggable apoptotic effector.","evidence":"Virtual screening, in vitro binding assays, Asp93 mutagenesis abolishing inhibitor effect, MCF-7 and TNBC cell viability, in vivo xenograft","pmids":["40533441"],"confidence":"High","gaps":["Full structural model of the CASP7-inhibitor-XIAP ternary complex not solved","Whether other IAPs regulate CASP7 similarly is untested","Long-term in vivo safety of XIAP-CASP7 disruption not evaluated"]},{"year":null,"claim":"The non-apoptotic functions of CASP7 (e.g., in inflammation, differentiation, or tissue remodeling) and its complete endogenous substrate repertoire distinct from CASP3 remain uncharacterized in the direct mechanistic literature.","evidence":"","pmids":[],"confidence":"Low","gaps":["No systematic substrate profiling distinguishing CASP7 from CASP3 in cells","Non-apoptotic roles not addressed by any discovery in the timeline","Physiological relevance of CASP3/CASP7 heteromeric complexes in vivo remains untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,2,3,6,9]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,1,2,3,5,6,8,9]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,5,7]}],"complexes":[],"partners":["CASP3","CASP10","XIAP","GZMB"],"other_free_text":[]},"mechanistic_narrative":"CASP7 is an executioner cysteine protease that functions as a central effector in apoptosis, cleaving key cellular substrates including PARP and lamin B1 downstream of death receptor, p53, and cytotoxic lymphocyte signaling pathways [PMID:8576161, PMID:9078237]. Synthesized as a cytoplasmic 35-kDa proenzyme, CASP7 is proteolytically activated by initiator caspases (CASP3, CASP10) and granzyme B through cleavage at conserved aspartate sites to yield active large (p20) and small (p12) subunits; notably, CASP3 activates CASP7 but not vice versa, and the p17 subunit of CASP3 can form a functional heteromeric complex with the CASP7 p12 subunit [PMID:8521391, PMID:8755496, PMID:8631895]. CASP7 enzymatic activity is directly inhibited by XIAP through its linker-BIR2 domain binding at a site involving Asp93 on CASP7, and disruption of this interaction selectively kills CASP3-deficient cancer cells [PMID:40533441]. CASP7 expression is post-transcriptionally regulated by miR-212-5p, which targets its 3′UTR within a lncfos/miR-212-5p/CASP7 axis that modulates neuronal apoptosis during ischemic injury [PMID:36715920]."},"prefetch_data":{"uniprot":{"accession":"P55210","full_name":"Caspase-7","aliases":["Apoptotic protease Mch-3","CMH-1","ICE-like apoptotic protease 3","ICE-LAP3"],"length_aa":303,"mass_kda":34.3,"function":"Thiol protease involved in different programmed cell death processes, such as apoptosis, pyroptosis or granzyme-mediated programmed cell death, by proteolytically cleaving target proteins (PubMed:11257230, PubMed:11257231, PubMed:11701129, PubMed:15314233, PubMed:16916640, PubMed:17646170, PubMed:18723680, PubMed:19581639, PubMed:8521391, PubMed:8567622, PubMed:8576161, PubMed:9070923). Has a marked preference for Asp-Glu-Val-Asp (DEVD) consensus sequences, with some plasticity for alternate non-canonical sequences (PubMed:12824163, PubMed:15314233, PubMed:17697120, PubMed:19581639, PubMed:20566630, PubMed:23650375, PubMed:23897474, PubMed:27032039). Its involvement in the different programmed cell death processes is probably determined by upstream proteases that activate CASP7 (By similarity). Acts as an effector caspase involved in the execution phase of apoptosis: following cleavage and activation by initiator caspases (CASP8, CASP9 and/or CASP10), mediates execution of apoptosis by catalyzing cleavage of proteins, such as CLSPN, PARP1, PTGES3 and YY1 (PubMed:10497198, PubMed:16123041, PubMed:16374543, PubMed:16916640, PubMed:18723680, PubMed:20566630, PubMed:21555521, PubMed:22184066, PubMed:22451931, PubMed:27889207, PubMed:28863261, PubMed:31586028, PubMed:34156061, PubMed:35338844, PubMed:35446120). Compared to CASP3, acts as a minor executioner caspase and cleaves a limited set of target proteins (PubMed:18723680). Acts as a key regulator of the inflammatory response in response to bacterial infection by catalyzing cleavage and activation of the sphingomyelin phosphodiesterase SMPD1 in the extracellular milieu, thereby promoting membrane repair (PubMed:21157428). Regulates pyroptosis in intestinal epithelial cells: cleaved and activated by CASP1 in response to S.typhimurium infection, promoting its secretion to the extracellular milieu, where it catalyzes activation of SMPD1, generating ceramides that repair membranes and counteract the action of gasdermin-D (GSDMD) pores (By similarity). Regulates granzyme-mediated programmed cell death in hepatocytes: cleaved and activated by granzyme B (GZMB) in response to bacterial infection, promoting its secretion to the extracellular milieu, where it catalyzes activation of SMPD1, generating ceramides that repair membranes and counteract the action of perforin (PRF1) pores (By similarity). Following cleavage by CASP1 in response to inflammasome activation, catalyzes processing and inactivation of PARP1, alleviating the transcription repressor activity of PARP1 (PubMed:22464733). Acts as an inhibitor of type I interferon production during virus-induced apoptosis by mediating cleavage of antiviral proteins CGAS, IRF3 and MAVS, thereby preventing cytokine overproduction (By similarity). Cleaves and activates sterol regulatory element binding proteins (SREBPs) (PubMed:8643593). Cleaves phospholipid scramblase proteins XKR4, XKR8 and XKR9 (By similarity). In case of infection, catalyzes cleavage of Kaposi sarcoma-associated herpesvirus protein ORF57, thereby preventing expression of viral lytic genes (PubMed:20159985). Cleaves BIRC6 following inhibition of BIRC6-caspase binding by DIABLO/SMAC (PubMed:36758104, PubMed:36758106) Lacks enzymatic activity","subcellular_location":"Cytoplasm, cytosol; Nucleus; Secreted, extracellular space","url":"https://www.uniprot.org/uniprotkb/P55210/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CASP7","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000165806","cell_line_id":"CID001708","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":3},{"compartment":"big_aggregates","grade":2}],"interactors":[],"url":"https://opencell.sf.czbiohub.org/target/CID001708","total_profiled":1310},"omim":[{"mim_id":"617647","title":"PROSTATE CANCER-ASSOCIATED TRANSCRIPT 18, NONCODING; PCAT18","url":"https://www.omim.org/entry/617647"},{"mim_id":"616466","title":"UNC5 NETRIN RECEPTOR D; UNC5D","url":"https://www.omim.org/entry/616466"},{"mim_id":"612787","title":"PSEUDOURIDYLATE SYNTHASE 10; PUS10","url":"https://www.omim.org/entry/612787"},{"mim_id":"612770","title":"PHOSPHATIDYLSERINE DECARBOXYLASE; PISD","url":"https://www.omim.org/entry/612770"},{"mim_id":"612218","title":"ZINC FINGER- AND BTB DOMAIN-CONTAINING PROTEIN 38; ZBTB38","url":"https://www.omim.org/entry/612218"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli fibrillar center","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CASP7"},"hgnc":{"alias_symbol":["MCH3","CMH-1","ICE-LAP3"],"prev_symbol":[]},"alphafold":{"accession":"P55210","domains":[{"cath_id":"3.40.50.1460","chopping":"59-191_214-295","consensus_level":"high","plddt":94.9727,"start":59,"end":295}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P55210","model_url":"https://alphafold.ebi.ac.uk/files/AF-P55210-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P55210-F1-predicted_aligned_error_v6.png","plddt_mean":81.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CASP7","jax_strain_url":"https://www.jax.org/strain/search?query=CASP7"},"sequence":{"accession":"P55210","fasta_url":"https://rest.uniprot.org/uniprotkb/P55210.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P55210/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P55210"}},"corpus_meta":[{"pmid":"8755496","id":"PMC_8755496","title":"In vitro 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\"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with enzymatic assay, multiple substrates tested, replicated by independent labs\",\n      \"pmids\": [\"8521391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"CPP32/CASP3 can cleave proCASP7 (proMch3α) to generate active CASP7, but CASP7 cannot efficiently cleave proCASP3, establishing a unidirectional activation relationship; additionally, the p17 subunit of CASP3 can form an active heteromeric complex with the p12 subunit of CASP7.\",\n      \"method\": \"Recombinant protein co-expression in Sf9 cells, cross-cleavage assay, apoptosis induction assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted heteromeric complex with functional apoptosis readout, supported by cleavage assays\",\n      \"pmids\": [\"8521391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Granzyme B directly cleaves and activates CASP7 (ICE-LAP3/Mch3/CMH-1) at Asp198-Ser199 (between p20 and p12 subunits); autocatalytic cleavage at the prosequence site (Asp23-Ala24) is not required for CASP7 activity in vitro.\",\n      \"method\": \"In vitro cleavage assay with purified granzyme B and recombinant CMH-1/CASP7; site-specific cleavage mapped by N-terminal sequencing\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with precise cleavage site mapping, replicated across multiple labs\",\n      \"pmids\": [\"8631895\", \"8805307\", \"8576161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"CASP7 (ICE-LAP3) is activated during Fas- and TNF-induced apoptosis; endogenous CASP7 is processed to its subunit forms upon receipt of a death stimulus, and overexpression of a truncated (pro-domain-deleted) form induces apoptosis in MCF7 cells.\",\n      \"method\": \"Western blot of endogenous CASP7 processing; overexpression of truncated CASP7 in MCF7 cells with apoptosis readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct demonstration of endogenous processing during physiological apoptosis plus functional overexpression assay\",\n      \"pmids\": [\"8576161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"CASP7 (ICE-LAP3) is localized to the cytoplasm as a 35-kDa proenzyme in multiple tissues and cell lines.\",\n      \"method\": \"Subcellular fractionation and immunocytochemistry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment, single paper\",\n      \"pmids\": [\"8576161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Granzyme B activates endogenous CASP7 (ICE-LAP3) in Jurkat T cells treated with granzyme B plus sublytic perforin, preceding apoptosis, placing CASP7 downstream of granzyme B in CTL/NK-mediated cytotoxicity.\",\n      \"method\": \"Cell-based apoptosis assay with granzyme B and perforin; Western blot of endogenous CASP7 processing\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis in cell-based system with endogenous protein detection, replicated across multiple labs\",\n      \"pmids\": [\"8805307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"CASP7 (Mch3) is activated by Mch4/CASP10 in vitro; Mch4 cleaves proMch3 at a conserved IXXD-S sequence to produce the large and small subunits of active CASP7, establishing CASP7 as a downstream target of initiator caspase Mch4.\",\n      \"method\": \"In vitro cleavage assay with recombinant Mch4 and recombinant proCASP7; SDS-PAGE analysis of processing\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with defined cleavage site, replicated across multiple studies\",\n      \"pmids\": [\"8755496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"CASP7 (Mch3) is cleaved by granzyme B at a conserved IXXD-A processing sequence, analogous to CPP32 processing, placing CASP7 in the granzyme B apoptotic pathway.\",\n      \"method\": \"In vitro cleavage assay with recombinant granzyme B and proMch3/proCASP7\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution, consistent with independent findings from multiple labs\",\n      \"pmids\": [\"8755496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CASP7 (Mch3α/CPP32) activation occurs downstream of p53-induced apoptosis, accompanied by cleavage of PARP and lamin B1, placing CASP7 as an effector protease in the p53 apoptotic pathway.\",\n      \"method\": \"Temperature-sensitive p53 cell line (LTR6); Western blot of CASP7 processing and substrate cleavage\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis using inducible p53 system with defined biochemical readouts, single lab\",\n      \"pmids\": [\"9078237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"XIAP binds CASP7 via its linker-BIR2 domain to inhibit CASP7; a small molecule inhibitor (643943) binds CASP7 at Asp93, releases the XIAP linker-BIR2 domain, and reactivates CASP7, selectively killing CASP3-deficient (CASP3/DR) cancer cells; mutation of Asp93 on CASP7 abolishes inhibitor cytotoxicity.\",\n      \"method\": \"Virtual screening, in vitro binding assay, site-directed mutagenesis (Asp93 substitution), cell viability assay in MCF-7 and TNBC lines, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis validates binding mode, multiple orthogonal methods including in vitro and in vivo\",\n      \"pmids\": [\"40533441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-212-5p directly targets the CASP7 3'UTR (validated by dual-luciferase assay), and lncfos suppresses miR-212-5p, forming a lncfos/miR-212-5p/CASP7 regulatory axis; upregulation of miR-212-5p reduces CASP7 expression and neuronal apoptosis in a rat MCAO ischemic stroke model.\",\n      \"method\": \"Dual-luciferase reporter assay for miR-212-5p binding to CASP7 3'UTR; intracerebroventricular injection of miR-212-5p agomir/antagomir and sh-fos in rat MCAO model; qRT-PCR, infarct volume, neurological scoring\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — luciferase validation plus in vivo functional rescue, single lab\",\n      \"pmids\": [\"36715920\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CASP7 (caspase-7) is an effector cysteine protease synthesized as a cytoplasmic proenzyme that is proteolytically activated by upstream initiator caspases (granzyme B, Mch4/CASP10, and CASP3) through cleavage at conserved aspartate sites, yielding an active heterodimeric enzyme that cleaves PARP and other apoptotic substrates; its activity is inhibited by XIAP binding to its linker-BIR2 domain, and it is transcriptionally regulated by miRNAs including miR-212-5p targeting its 3'UTR.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CASP7 is an executioner cysteine protease that functions as a central effector in apoptosis, cleaving key cellular substrates including PARP and lamin B1 downstream of death receptor, p53, and cytotoxic lymphocyte signaling pathways [PMID:8576161, PMID:9078237]. Synthesized as a cytoplasmic 35-kDa proenzyme, CASP7 is proteolytically activated by initiator caspases (CASP3, CASP10) and granzyme B through cleavage at conserved aspartate sites to yield active large (p20) and small (p12) subunits; notably, CASP3 activates CASP7 but not vice versa, and the p17 subunit of CASP3 can form a functional heteromeric complex with the CASP7 p12 subunit [PMID:8521391, PMID:8755496, PMID:8631895]. CASP7 enzymatic activity is directly inhibited by XIAP through its linker-BIR2 domain binding at a site involving Asp93 on CASP7, and disruption of this interaction selectively kills CASP3-deficient cancer cells [PMID:40533441]. CASP7 expression is post-transcriptionally regulated by miR-212-5p, which targets its 3′UTR within a lncfos/miR-212-5p/CASP7 axis that modulates neuronal apoptosis during ischemic injury [PMID:36715920].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Identification of CASP7 as a DEVD-cleaving executioner caspase resolved the question of whether additional CPP32-like proteases exist and established that CASP7 autocatalytically processes into p20/p12 subunits with PARP-cleaving activity indistinguishable from CASP3.\",\n      \"evidence\": \"Recombinant expression in bacteria, in vitro protease activity assays with DEVD-AMC and PARP substrates, SDS-PAGE of processing products\",\n      \"pmids\": [\"8521391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CASP7 has unique substrates distinct from CASP3 remained unknown\", \"In vivo role versus CASP3 not addressed\", \"Crystal structure not yet available\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Demonstration that CASP3 cleaves proCASP7 but not vice versa, and that CASP3-p17/CASP7-p12 heteromers are enzymatically active, established the hierarchical and cooperative relationship between the two executioner caspases.\",\n      \"evidence\": \"Recombinant cross-cleavage assays and heteromeric complex reconstitution in Sf9 cells with apoptosis readout\",\n      \"pmids\": [\"8521391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of CASP3/CASP7 heteromers in cells not demonstrated\", \"Whether other caspases can also activate CASP7 was unknown\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Mapping of granzyme B and initiator caspase (CASP10/Mch4) cleavage sites on proCASP7 placed CASP7 firmly in both the CTL/NK cytotoxicity and death-receptor apoptotic cascades, answering how CASP7 is activated upstream.\",\n      \"evidence\": \"In vitro reconstitution with purified granzyme B and recombinant CASP10; N-terminal sequencing of cleavage products; cell-based assay with granzyme B plus perforin in Jurkat cells\",\n      \"pmids\": [\"8631895\", \"8805307\", \"8755496\", \"8576161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CASP8 or CASP9 directly activate CASP7 was not tested\", \"Relative contribution of granzyme B versus caspase-mediated activation in vivo unresolved\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Demonstration that endogenous CASP7 is processed during Fas- and TNF-induced apoptosis, and that its overexpression induces apoptosis, confirmed CASP7 as a physiological effector caspase rather than a biochemical curiosity.\",\n      \"evidence\": \"Western blot of endogenous CASP7 processing in Fas/TNF-stimulated cells; overexpression of truncated CASP7 in MCF7 cells; subcellular fractionation showing cytoplasmic localization\",\n      \"pmids\": [\"8576161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Non-apoptotic functions of CASP7 not explored\", \"Tissue-specific roles not addressed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Placing CASP7 activation downstream of p53 induction expanded the known apoptotic contexts of CASP7 beyond death receptors and granzyme B to include intrinsic/genotoxic stress pathways.\",\n      \"evidence\": \"Temperature-sensitive p53 cell line with Western blot detection of CASP7 processing and PARP/lamin B1 cleavage\",\n      \"pmids\": [\"9078237\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether p53-mediated activation proceeds through mitochondrial caspase-9 or another route not determined\", \"Single cell system used\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of miR-212-5p as a direct post-transcriptional repressor of CASP7 via its 3′UTR, within a lncfos/miR-212-5p/CASP7 axis, revealed a non-caspase regulatory layer controlling CASP7 expression in neuronal ischemia.\",\n      \"evidence\": \"Dual-luciferase reporter assay validating miR-212-5p binding to CASP7 3′UTR; in vivo agomir/antagomir experiments in rat MCAO stroke model\",\n      \"pmids\": [\"36715920\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this axis operates outside the CNS is unknown\", \"Endogenous CASP7 protein levels not confirmed by Western blot in all conditions\", \"Single lab finding\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Structural and pharmacological dissection of the XIAP-CASP7 inhibitory interaction revealed that XIAP linker-BIR2 engages CASP7 at Asp93, and that a small molecule disrupting this interface selectively reactivates CASP7 in CASP3-deficient cancers, establishing CASP7 as a druggable apoptotic effector.\",\n      \"evidence\": \"Virtual screening, in vitro binding assays, Asp93 mutagenesis abolishing inhibitor effect, MCF-7 and TNBC cell viability, in vivo xenograft\",\n      \"pmids\": [\"40533441\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full structural model of the CASP7-inhibitor-XIAP ternary complex not solved\", \"Whether other IAPs regulate CASP7 similarly is untested\", \"Long-term in vivo safety of XIAP-CASP7 disruption not evaluated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The non-apoptotic functions of CASP7 (e.g., in inflammation, differentiation, or tissue remodeling) and its complete endogenous substrate repertoire distinct from CASP3 remain uncharacterized in the direct mechanistic literature.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No systematic substrate profiling distinguishing CASP7 from CASP3 in cells\", \"Non-apoptotic roles not addressed by any discovery in the timeline\", \"Physiological relevance of CASP3/CASP7 heteromeric complexes in vivo remains untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 2, 3, 6, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 1, 2, 3, 5, 6, 8, 9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 5, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CASP3\", \"CASP10\", \"XIAP\", \"GZMB\"],\n    \"other_free_text\": []\n  }\n}\n```"}