{"gene":"CASP4","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":1995,"finding":"ICH-2 (CASP4) is a functional cysteine protease in vitro: purified recombinant ICH-2 cleaved substrates in a cell-free protease assay. Its inhibitor profile and substrate cleavage pattern overlapped with but differed from ICE, suggesting distinct in vivo substrate specificities.","method":"In vitro protease assay with purified recombinant protein; inhibitor profiling; overexpression in insect cells inducing apoptosis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro enzymatic activity with purified recombinant protein, plus functional overexpression apoptosis assay, single lab but two orthogonal methods","pmids":["7797510"],"is_preprint":false},{"year":1995,"finding":"TX (CASP4), when co-expressed with PARP in COS cells, cleaved poly(ADP-ribose) polymerase (PARP) in a pattern identical to that seen in apoptotic cells, demonstrating PARP is a substrate of CASP4 inside the cell. ICE itself also cleaved PARP in vitro but required 50–100-fold higher concentration than for IL-1β precursor processing.","method":"COS cell co-transfection assay (PARP + TX/ICE/Nedd-2); in vitro cleavage assay with purified recombinant ICE on PARP substrate","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — cell-based co-expression substrate cleavage confirmed by in vitro reconstitution with purified enzyme, two complementary methods in single study","pmids":["7642516"],"is_preprint":false}],"current_model":"CASP4 (ICH-2/TX) is a catalytically active ICE-family cysteine protease that cleaves PARP in a pattern matching apoptotic cells when overexpressed intracellularly, induces apoptosis upon overexpression, and shares catalytic properties with ICE while differing in substrate specificity, suggesting a distinct in vivo function."},"narrative":{"mechanistic_narrative":"CASP4 (ICH-2/TX) is a catalytically active cysteine protease of the ICE family that participates in apoptotic proteolysis when expressed intracellularly [PMID:7797510, PMID:7642516]. Purified recombinant CASP4 cleaves peptide substrates in cell-free assays, and its inhibitor profile and substrate preference overlap with but are distinct from those of ICE, indicating that CASP4 has its own in vivo substrate specificity [PMID:7797510]. Within cells, CASP4 cleaves poly(ADP-ribose) polymerase (PARP) in a pattern identical to that observed in apoptotic cells, and its overexpression is sufficient to induce apoptosis [PMID:7797510, PMID:7642516]. Beyond this in vitro and overexpression-based characterization of its protease activity and PARP cleavage, no further mechanistic detail — including physiological activating signals, upstream regulators, or endogenous complex membership — has been characterized in the available corpus.","teleology":[{"year":1995,"claim":"Establishing whether CASP4 is itself an enzyme answered the basic question of its biochemical identity, showing it is a bona fide ICE-family cysteine protease rather than a passive family member.","evidence":"In vitro protease assay with purified recombinant ICH-2, inhibitor profiling, and overexpression-induced apoptosis in insect cells","pmids":["7797510"],"confidence":"High","gaps":["No endogenous substrate identified in this study","Inhibitor/substrate overlap with ICE leaves the distinct in vivo specificity undefined","Physiological activating signal and upstream protease not addressed"]},{"year":1995,"claim":"Identifying a cellular substrate addressed what CASP4 actually does in cells, demonstrating it cleaves PARP in the apoptotic pattern and thereby linking it to programmed cell death proteolysis.","evidence":"COS cell co-transfection of TX with PARP, with in vitro confirmation using purified recombinant enzyme on PARP substrate","pmids":["7642516"],"confidence":"High","gaps":["PARP cleavage shown under co-expression, not at endogenous CASP4 levels","Whether PARP is a direct physiological substrate versus an overexpression artifact is unresolved","No identification of the apoptotic pathway context or activating caspase upstream of CASP4"]},{"year":null,"claim":"The endogenous activation mechanism, physiological substrates, and complex membership of CASP4 remain undefined in the available corpus.","evidence":"","pmids":[],"confidence":"Low","gaps":["No upstream activating signal or platform identified","No endogenous substrate confirmed beyond overexpression-based PARP cleavage","No structural model or subcellular localization data"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0]}],"localization":[],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,1]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P49662","full_name":"Caspase-4","aliases":["ICE and Ced-3 homolog 2","ICH-2","ICE(rel)-II","Mih1","Protease TX"],"length_aa":377,"mass_kda":43.3,"function":"Inflammatory caspase that acts as the effector of the non-canonical inflammasome by mediating lipopolysaccharide (LPS)-induced pyroptosis (PubMed:25119034, PubMed:26375003, PubMed:32109412, PubMed:34671164, PubMed:37001519, PubMed:37993712, PubMed:37993714). Also indirectly activates the NLRP3 and NLRP6 inflammasomes (PubMed:23516580, PubMed:26375003, PubMed:32109412, PubMed:7797510). Acts as a thiol protease that cleaves a tetrapeptide after an Asp residue at position P1: catalyzes cleavage of CGAS, GSDMD and IL18 (PubMed:15326478, PubMed:23516580, PubMed:26375003, PubMed:28314590, PubMed:32109412, PubMed:37993712, PubMed:37993714, PubMed:7797510). Effector of the non-canonical inflammasome independently of NLRP3 inflammasome and CASP1: the non-canonical inflammasome promotes pyroptosis through GSDMD cleavage without involving secretion of cytokine IL1B (PubMed:25119034, PubMed:25121752, PubMed:26375003, PubMed:31268602, PubMed:32109412, PubMed:37993712, PubMed:37993714). In the non-canonical inflammasome, CASP4 is activated by direct binding to the lipid A moiety of LPS without the need of an upstream sensor (PubMed:25119034, PubMed:25121752, PubMed:29520027, PubMed:32510692, PubMed:32581219, PubMed:37993712). LPS-binding promotes CASP4 activation and CASP4-mediated cleavage of GSDMD and IL18, followed by IL18 secretion through the GSDMD pore, pyroptosis of infected cells and their extrusion into the gut lumen (PubMed:25119034, PubMed:25121752, PubMed:37993712, PubMed:37993714). Also indirectly promotes secretion of mature cytokines (IL1A and HMGB1) downstream of GSDMD-mediated pyroptosis via activation of the NLRP3 and NLRP6 inflammasomes (PubMed:26375003, PubMed:32109412). Involved in NLRP3-dependent CASP1 activation and IL1B secretion in response to non-canonical activators, such as UVB radiation or cholera enterotoxin (PubMed:22246630, PubMed:23516580, PubMed:24879791, PubMed:25964352, PubMed:26173988, PubMed:26174085, PubMed:26508369). Involved in NLRP6 inflammasome-dependent activation in response to lipoteichoic acid (LTA), a cell-wall component of Gram-positive bacteria, which leads to CASP1 activation and IL1B secretion (PubMed:33377178). Involved in LPS-induced IL6 secretion; this activity may not require caspase enzymatic activity (PubMed:26508369). The non-canonical inflammasome is required for innate immunity to cytosolic, but not vacuolar, bacteria (By similarity). Plays a crucial role in the restriction of S.typhimurium replication in colonic epithelial cells during infection (PubMed:25121752, PubMed:25964352). Activation of the non-canonical inflammasome in brain endothelial cells can lead to excessive pyroptosis, leading to blood-brain barrier breakdown (By similarity). Pyroptosis limits bacterial replication, while cytokine secretion promotes the recruitment and activation of immune cells and triggers mucosal inflammation (PubMed:25121752, PubMed:25964352, PubMed:26375003). May also act as an activator of adaptive immunity in dendritic cells, following activation by oxidized phospholipid 1-palmitoyl-2-arachidonoyl- sn-glycero-3-phosphorylcholine, an oxidized phospholipid (oxPAPC) (By similarity). Involved in cell death induced by endoplasmic reticulum stress and by treatment with cytotoxic APP peptides found in Alzheimer's patient brains (PubMed:15123740, PubMed:22246630, PubMed:23661706). Cleavage of GSDMD is not strictly dependent on the consensus cleavage site but depends on an exosite interface on CASP4 that recognizes and binds the Gasdermin-D, C-terminal (GSDMD-CT) part (PubMed:32109412). Catalyzes cleavage and maturation of IL18; IL18 processing also depends of the exosite interface on CASP4 (PubMed:15326478, PubMed:37993712, PubMed:37993714). In contrast, it does not directly process IL1B (PubMed:7743998, PubMed:7797510, PubMed:7797592). During non-canonical inflammasome activation, cuts CGAS and may play a role in the regulation of antiviral innate immune activation (PubMed:28314590) (Microbial infection) In response to the Td92 surface protein of the periodontal pathogen T.denticola, activated by cathepsin CTSG which leads to production and secretion of IL1A and pyroptosis of gingival fibroblasts","subcellular_location":"Cytoplasm, cytosol; Endoplasmic reticulum membrane; Mitochondrion; Inflammasome; Secreted","url":"https://www.uniprot.org/uniprotkb/P49662/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CASP4","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CASP4","total_profiled":1310},"omim":[{"mim_id":"617042","title":"GASDERMIN D; GSDMD","url":"https://www.omim.org/entry/617042"},{"mim_id":"615680","title":"CASPASE RECRUITMENT DOMAIN-CONTAINING PROTEIN 16; CARD16","url":"https://www.omim.org/entry/615680"},{"mim_id":"615301","title":"TRANSMEMBRANE PROTEIN 214; TMEM214","url":"https://www.omim.org/entry/615301"},{"mim_id":"614119","title":"TEASHIRT ZINC FINGER HOMEOBOX 3; TSHZ3","url":"https://www.omim.org/entry/614119"},{"mim_id":"608633","title":"CASPASE 12, APOPTOSIS-RELATED CYSTEINE PROTEASE; CASP12","url":"https://www.omim.org/entry/608633"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","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/CASP4"},"hgnc":{"alias_symbol":["ICE(rel)II","ICH-2","TX"],"prev_symbol":[]},"alphafold":{"accession":"P49662","domains":[{"cath_id":"-","chopping":"32-65","consensus_level":"medium","plddt":78.2962,"start":32,"end":65},{"cath_id":"3.40.50.1460","chopping":"112-262_295-364","consensus_level":"high","plddt":90.4338,"start":112,"end":364}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P49662","model_url":"https://alphafold.ebi.ac.uk/files/AF-P49662-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P49662-F1-predicted_aligned_error_v6.png","plddt_mean":78.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CASP4","jax_strain_url":"https://www.jax.org/strain/search?query=CASP4"},"sequence":{"accession":"P49662","fasta_url":"https://rest.uniprot.org/uniprotkb/P49662.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P49662/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P49662"}},"corpus_meta":[{"pmid":"7951320","id":"PMC_7951320","title":"Identification 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Part A","url":"https://pubmed.ncbi.nlm.nih.gov/16470732","citation_count":20,"is_preprint":false},{"pmid":"24316429","id":"PMC_24316429","title":"Cell cycle arrest and apoptosis induced by 1α,25(OH)2D3 and TX 527 in Kaposi sarcoma is VDR dependent.","date":"2013","source":"The Journal of steroid biochemistry and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/24316429","citation_count":19,"is_preprint":false},{"pmid":"37578316","id":"PMC_37578316","title":"Nanoenzyme-Reinforced Multifunctional Scaffold Based on Ti3C2Tx MXene Nanosheets for Promoting Structure-Functional Skeletal Muscle Regeneration via Electroactivity and Microenvironment Management.","date":"2023","source":"Nano letters","url":"https://pubmed.ncbi.nlm.nih.gov/37578316","citation_count":19,"is_preprint":false},{"pmid":"10785451","id":"PMC_10785451","title":"Hydrocephalus in the H-Tx rat: a monogenic disease?","date":"2000","source":"Experimental neurology","url":"https://pubmed.ncbi.nlm.nih.gov/10785451","citation_count":19,"is_preprint":false},{"pmid":"14666730","id":"PMC_14666730","title":"Antiangiogenic hypoxic cytotoxin TX-402 inhibits hypoxia-inducible factor 1 signaling pathway.","date":"2003","source":"Anticancer research","url":"https://pubmed.ncbi.nlm.nih.gov/14666730","citation_count":18,"is_preprint":false},{"pmid":"37056011","id":"PMC_37056011","title":"Ti3C2Tx MXene nanosheets enhance the tolerance of Torreya grandis to Pb stress.","date":"2022","source":"Journal of hazardous materials","url":"https://pubmed.ncbi.nlm.nih.gov/37056011","citation_count":16,"is_preprint":false},{"pmid":"34498860","id":"PMC_34498860","title":"Tuning Cell-Free Composition Controls the Time Delay, Dynamics, and Productivity of TX-TL Expression.","date":"2021","source":"ACS synthetic biology","url":"https://pubmed.ncbi.nlm.nih.gov/34498860","citation_count":16,"is_preprint":false},{"pmid":"37341969","id":"PMC_37341969","title":"Surface Functional Modification by Ti3 C2 Tx MXene on PLLA Nanofibers for Optimizing Neural Stem Cell Engineering.","date":"2023","source":"Advanced healthcare materials","url":"https://pubmed.ncbi.nlm.nih.gov/37341969","citation_count":16,"is_preprint":false},{"pmid":"7515665","id":"PMC_7515665","title":"DNA rearrangements and altered transcripts of the MLL gene in a human T-ALL cell line Karpas 45 with a t(X;11) (q13;q23) translocation.","date":"1994","source":"Genes, chromosomes & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/7515665","citation_count":16,"is_preprint":false},{"pmid":"15375625","id":"PMC_15375625","title":"Analysis of TGF-beta2 and TGF-beta3 expression in the hydrocephalic H-Tx rat brain.","date":"2004","source":"Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery","url":"https://pubmed.ncbi.nlm.nih.gov/15375625","citation_count":16,"is_preprint":false},{"pmid":"8433029","id":"PMC_8433029","title":"Association of HSP72 with the nuclear (TX-100-insoluble) fraction upon heating tolerant and non-tolerant HeLa S3 cells.","date":"1993","source":"International journal of hyperthermia : the official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group","url":"https://pubmed.ncbi.nlm.nih.gov/8433029","citation_count":16,"is_preprint":false},{"pmid":"18352806","id":"PMC_18352806","title":"Analysis of neuronal cell death in the cerebral cortex of H-Tx rats with compensated hydrocephalus.","date":"2008","source":"Journal of neurosurgery. 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genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21735174","citation_count":14,"is_preprint":false},{"pmid":"16926859","id":"PMC_16926859","title":"Heterotaxy and cardiac defect in a girl with chromosome translocation t(X;1)(q26;p13.1) and involvement of ZIC3.","date":"2006","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/16926859","citation_count":14,"is_preprint":false},{"pmid":"37162447","id":"PMC_37162447","title":"Ti3 C2 TX MXene Ink Direct Writing Flexible Sensors for Disposable Paper Toys.","date":"2023","source":"Small (Weinheim an der Bergstrasse, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/37162447","citation_count":14,"is_preprint":false},{"pmid":"31838186","id":"PMC_31838186","title":"In vitro studies revealed a downregulation of Wnt/β-catenin cascade by active vitamin D and TX 527 analog in a Kaposi's sarcoma cellular model.","date":"2019","source":"Toxicology in vitro : an international journal published in association with BIBRA","url":"https://pubmed.ncbi.nlm.nih.gov/31838186","citation_count":14,"is_preprint":false},{"pmid":"34013401","id":"PMC_34013401","title":"A sensitive electrochemical DNA sensor for detecting Helicobacter pylori based on accordion-like Ti3C2Tx: a simple strategy.","date":"2021","source":"Analytical and bioanalytical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34013401","citation_count":13,"is_preprint":false},{"pmid":"37292292","id":"PMC_37292292","title":"The performance of whole genome bisulfite sequencing on DNBSEQ-Tx platform examined by different library preparation strategies.","date":"2023","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/37292292","citation_count":13,"is_preprint":false},{"pmid":"11306798","id":"PMC_11306798","title":"Meiotic segregation analysis by FISH investigation of spermatozoa of a 46,Y,der(X),t(X;Y)(qter-->p22::q11-->qter) carrier.","date":"2001","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11306798","citation_count":13,"is_preprint":false},{"pmid":"10447596","id":"PMC_10447596","title":"Nuclear genes from Tx CMS maintainer lines are unable to maintain atp6 RNA editing in any anther cell-type in the sorghum bicolor A3 cytoplasm.","date":"1999","source":"Current genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10447596","citation_count":12,"is_preprint":false},{"pmid":"20620589","id":"PMC_20620589","title":"A novel case of t(X;1)(p11.2;p34) in a renal cell carcinoma with TFE3 rearrangement and favorable outcome in a 57-year-old patient.","date":"2010","source":"Cancer genetics and cytogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/20620589","citation_count":12,"is_preprint":false},{"pmid":"20386926","id":"PMC_20386926","title":"Severe Alport syndrome in a young woman caused by a t(X;1)(q22.3;p36.32) balanced translocation.","date":"2010","source":"Pediatric nephrology (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/20386926","citation_count":12,"is_preprint":false},{"pmid":"15325093","id":"PMC_15325093","title":"Multicolor fluorescence in situ hybridization analysis of a synovial sarcoma of the larynx with a t(X;18)(p11.2;q11.2) and trisomies 2 and 8.","date":"2004","source":"Cancer genetics and cytogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/15325093","citation_count":12,"is_preprint":false},{"pmid":"8281521","id":"PMC_8281521","title":"Identification of a yeast artificial chromosome that spans the human papillary renal cell carcinoma-associated t(X;1) breakpoint in Xp11.2.","date":"1993","source":"Cancer genetics and cytogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/8281521","citation_count":11,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":59680,"output_tokens":815,"usd":0.095632,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":6945,"output_tokens":1236,"usd":0.032813,"stage2_stop_reason":"end_turn"},"total_usd":0.128445,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through all 100 abstracts, I need to find papers about CASP4 (also known as ICH-2 or TX in some contexts).\n\nPaper [5] (PMID 7797510) describes ICH-2 (CASP4) - this is clearly the canonical protein.\nPaper [13] (PMID 7642516) describes TX (CASP4) alongside ICE and Nedd-2 - this is about the canonical protein.\n\nAll other papers are about unrelated genes/topics (chromosomal translocations involving SYT/SSX, TFE3, MLL, Wilson disease mouse models \"tx\", MXene nanomaterials \"Ti3C2Tx\", cell-free TX-TL systems, thromboxane \"TxA2\", H-Tx hydrocephalic rats, etc.) and must be excluded.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"ICH-2 (CASP4) is a functional cysteine protease in vitro: purified recombinant ICH-2 cleaved substrates in a cell-free protease assay. Its inhibitor profile and substrate cleavage pattern overlapped with but differed from ICE, suggesting distinct in vivo substrate specificities.\",\n      \"method\": \"In vitro protease assay with purified recombinant protein; inhibitor profiling; overexpression in insect cells inducing apoptosis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro enzymatic activity with purified recombinant protein, plus functional overexpression apoptosis assay, single lab but two orthogonal methods\",\n      \"pmids\": [\"7797510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"TX (CASP4), when co-expressed with PARP in COS cells, cleaved poly(ADP-ribose) polymerase (PARP) in a pattern identical to that seen in apoptotic cells, demonstrating PARP is a substrate of CASP4 inside the cell. ICE itself also cleaved PARP in vitro but required 50–100-fold higher concentration than for IL-1β precursor processing.\",\n      \"method\": \"COS cell co-transfection assay (PARP + TX/ICE/Nedd-2); in vitro cleavage assay with purified recombinant ICE on PARP substrate\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — cell-based co-expression substrate cleavage confirmed by in vitro reconstitution with purified enzyme, two complementary methods in single study\",\n      \"pmids\": [\"7642516\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CASP4 (ICH-2/TX) is a catalytically active ICE-family cysteine protease that cleaves PARP in a pattern matching apoptotic cells when overexpressed intracellularly, induces apoptosis upon overexpression, and shares catalytic properties with ICE while differing in substrate specificity, suggesting a distinct in vivo function.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CASP4 (ICH-2/TX) is a catalytically active cysteine protease of the ICE family that participates in apoptotic proteolysis when expressed intracellularly [#0, #1]. Purified recombinant CASP4 cleaves peptide substrates in cell-free assays, and its inhibitor profile and substrate preference overlap with but are distinct from those of ICE, indicating that CASP4 has its own in vivo substrate specificity [#0]. Within cells, CASP4 cleaves poly(ADP-ribose) polymerase (PARP) in a pattern identical to that observed in apoptotic cells, and its overexpression is sufficient to induce apoptosis [#0, #1]. Beyond this in vitro and overexpression-based characterization of its protease activity and PARP cleavage, no further mechanistic detail — including physiological activating signals, upstream regulators, or endogenous complex membership — has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing whether CASP4 is itself an enzyme answered the basic question of its biochemical identity, showing it is a bona fide ICE-family cysteine protease rather than a passive family member.\",\n      \"evidence\": \"In vitro protease assay with purified recombinant ICH-2, inhibitor profiling, and overexpression-induced apoptosis in insect cells\",\n      \"pmids\": [\"7797510\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No endogenous substrate identified in this study\",\n        \"Inhibitor/substrate overlap with ICE leaves the distinct in vivo specificity undefined\",\n        \"Physiological activating signal and upstream protease not addressed\"\n      ]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identifying a cellular substrate addressed what CASP4 actually does in cells, demonstrating it cleaves PARP in the apoptotic pattern and thereby linking it to programmed cell death proteolysis.\",\n      \"evidence\": \"COS cell co-transfection of TX with PARP, with in vitro confirmation using purified recombinant enzyme on PARP substrate\",\n      \"pmids\": [\"7642516\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"PARP cleavage shown under co-expression, not at endogenous CASP4 levels\",\n        \"Whether PARP is a direct physiological substrate versus an overexpression artifact is unresolved\",\n        \"No identification of the apoptotic pathway context or activating caspase upstream of CASP4\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The endogenous activation mechanism, physiological substrates, and complex membership of CASP4 remain undefined in the available corpus.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No upstream activating signal or platform identified\",\n        \"No endogenous substrate confirmed beyond overexpression-based PARP cleavage\",\n        \"No structural model or subcellular localization data\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"loss","faith_supported":3,"faith_total":3,"faith_pct":100.0}}