{"gene":"CAST","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2008,"finding":"Crystal structure of calcium-bound calpain 2 heterodimer bound by an inhibitory domain of calpastatin at 2.4-Å resolution revealed the mechanism of inhibition: calpastatin occupies both sides of the active site cleft, passes through the cleft but escapes cleavage by looping around the active site cysteine, and recognizes multiple lower-affinity sites present only in the calcium-bound form of calpain. The structure also revealed conformational changes calpain undergoes upon calcium binding, including opening of the active site cleft and domain compaction.","method":"X-ray crystallography (2.4 Å resolution crystal structure of calpain 2–calpastatin inhibitory domain complex)","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with direct mechanistic interpretation of inhibition mechanism; single paper but multiple orthogonal structural analyses","pmids":["19020623"],"is_preprint":false},{"year":1989,"finding":"Calpastatin was established as the endogenous intracellular inhibitor of calpains (calpain I/μ-calpain and calpain II/m-calpain). Structure–function analysis using mutated cDNAs expressed in E. coli defined the inhibitory domains of calpastatin. Interleukin-2 receptor-linked expression of calpastatin was demonstrated in HTLV-I-infected T-cells, and calpastatin was shown to inhibit calcium-dependent calpain proteolytic activity.","method":"Biochemical inhibition assays, site-directed mutagenesis of cDNA expressed in E. coli, cell-based expression studies","journal":"Biochemistry international","confidence":"High","confidence_rationale":"Tier 1–2 — foundational biochemical reconstitution and mutagenesis; replicated across labs over decades","pmids":["2548504"],"is_preprint":false},{"year":1998,"finding":"Calpastatin is cleaved by caspases during early apoptosis. In anti-Fas or staurosporine-treated Jurkat T-cells and apoptotic SH-SY5Y neuroblastoma cells, the high-molecular-weight form of calpastatin (110 kDa) was degraded to immunoreactive fragments (75 kDa, 30 kDa). In vitro, recombinant caspase-1, -3, and -7 all cleaved calpastatin; caspase-1 cleaved at ALDD137↓L, LSSD203↓F, and ALAD404↓S (in domains I and III), while caspase-3 cleaved only at ALDD137↓L. Cleavage was blocked by caspase-specific inhibitors. Notably, caspase-1-fragmented calpastatin retained near-normal calpain inhibitory activity, suggesting that caspase-mediated fragmentation has effects beyond loss of calpain inhibition.","method":"In vitro cleavage assays with recombinant caspases, immunoblot of apoptotic cells, caspase inhibitor pretreatment, in vitro translation","journal":"Archives of biochemistry and biophysics","confidence":"High","confidence_rationale":"Tier 1–2 — reconstituted in vitro with defined recombinant enzymes, site-specific cleavage mapped, confirmed in two cell types","pmids":["9705209"],"is_preprint":false},{"year":1999,"finding":"Calpastatin overexpression partially blocked TNF-α-inducible IκBα proteolysis and NF-κB-dependent promoter activity in HepG2 cells, demonstrating that cytosolic m-calpain mediates a proteasome-independent pathway for IκBα degradation and NF-κB activation in parallel to the ubiquitin-proteasome pathway.","method":"Transient cotransfection with calpastatin expression construct, fluorescent calpain activity assay, NF-κB reporter assay, cell fractionation, broken-cell reconstitution with purified m-calpain","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods including reconstitution with purified enzyme, genetic (calpastatin overexpression) and pharmacological inhibition, confirmed in ubiquitin-deficient ts20b cells","pmids":["9873017"],"is_preprint":false},{"year":1999,"finding":"CAST (CD3ε-associated signal transducer, later identified as hPAF49/RNA Pol I subunit) was isolated as a novel CD3ε-binding protein. It specifically interacts in vivo and in vitro with CD3ε but not CD3ζ or FcRγ, via a unique membrane-proximal region of CD3ε. CAST contains a single tyrosine that undergoes tyrosine phosphorylation upon TCR stimulation. Dominant-negative CAST constructs (minimum CD3ε-binding domain or tyrosine mutant) strongly suppressed NFAT activation and IL-2 production, indicating CAST transduces activation signals through the CD3ε-containing TCR signaling module.","method":"Co-immunoprecipitation (in vivo and in vitro), yeast two-hybrid, dominant-negative overexpression, NFAT-luciferase reporter assay, IL-2 ELISA","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 — reciprocal co-IP plus functional dominant-negative phenotype, single lab; note this paper's CAST is a distinct protein (hPAF49) from calpastatin, but both share the CAST symbol and are in the corpus","pmids":["10373416"],"is_preprint":false},{"year":2006,"finding":"The human RNA Polymerase I-specific subunit CAST (also called hPAF49, previously identified as CD3ε-associated CAST) was characterized as an integral component of initiation-competent Pol Iβ complexes. CAST/hPAF49 undergoes growth-regulated tyrosine phosphorylation at a conserved residue. It interacts with the activator UBF and weakly with SL1 at the rDNA promoter. CAST/hPAF49-specific antibodies and excess CAST/hPAF49 protein inhibit UBF-activated transcription but not basal Pol I transcription, and disrupt the CAST/hPAF49–UBF interaction, indicating that its interaction with UBF is required for transcriptional activation.","method":"Immunoprecipitation, in vitro transcription assay, antibody inhibition, chromatin immunoprecipitation, phosphorylation analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical methods (co-IP, in vitro transcription inhibition, ChIP) in single lab; functional consequence of CAST–UBF interaction directly demonstrated","pmids":["16809778"],"is_preprint":false},{"year":2008,"finding":"In Alzheimer's disease neurons, calpastatin (CAST) is markedly depleted through proteolysis mediated by caspase-1, caspase-3, and calpains themselves, creating a feed-forward loop. CAST depletion along dendrites coincides topographically with calpain II and ERK1/2 activation, caspase-3-mediated tau cleavage, and tau/neurofilament hyperphosphorylation. In mice, intrahippocampal kainic acid administration reproduced these changes and caused cytoskeletal proteolysis and neuronal death; these effects were substantially reduced in mice overexpressing human CAST. shRNA-mediated CAST reduction in neuronal cells caused calpain-mediated death at calcium-injury levels sublethal to CAST-expressing cells.","method":"Immunofluorescence/immunohistochemistry of AD brain, intrahippocampal kainic acid mouse model, transgenic CAST overexpression, shRNA knockdown in neuronal cells, cell death assays (propidium iodide, LDH)","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal approaches (human tissue, mouse KA model, transgenic rescue, shRNA KD) with consistent mechanistic findings across methods","pmids":["19020018"],"is_preprint":false},{"year":2018,"finding":"Pin1 (peptidyl-prolyl cis/trans isomerase) interacts with calpastatin (CAST) and regulates CAST activity, thereby modulating CAST/calpain2-mediated necrosis in retinal neurons under glutamate excitotoxicity. Co-IP and computer simulation confirmed Pin1–CAST binding. Juglone (Pin1 inhibitor) reduced CAST phosphorylation and shifted CAST/calpain2 balance to decrease necrosis; siRNA knockdown of Pin1 in RGC-5 cells confirmed the regulatory pathway. In vivo, Pin1 inhibition protected retinal ganglion cells from glutamate-induced damage.","method":"Co-immunoprecipitation, computer simulation (docking), western blot, real-time qPCR, siRNA knockdown, flow cytometry, propidium iodide staining, LDH assay, flash electroretinogram","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP plus siRNA functional rescue plus in vivo validation, single lab","pmids":["29403356"],"is_preprint":false},{"year":2019,"finding":"A homozygous nonsense mutation in CAST (c.544G>T, p.Glu182*) causes PLACK syndrome (peeling skin, leukonychia, acral keratoses, cheilitis, knuckle pads). Real-time qRT-PCR and immunoblot analysis of skin fibroblasts from affected individuals showed reduced calpastatin expression, and in vitro calpastatin activity assays demonstrated decreased inhibitory activity, establishing loss of calpastatin function as the causative mechanism.","method":"Whole exome sequencing, Sanger sequencing validation, real-time qRT-PCR, immunoblot, in vitro calpastatin activity assay","journal":"Cell and tissue research","confidence":"High","confidence_rationale":"Tier 1–2 — direct functional assay of calpastatin activity in patient-derived cells, complemented by expression analysis; validates causative role of CAST loss-of-function","pmids":["31392520"],"is_preprint":false},{"year":2013,"finding":"Genetic association analysis mapped a CAST gene SNP (rs4434401) to keratoconus susceptibility in both familial and case-control cohorts (combined meta P=0.002), with in silico analysis suggesting differential regulation of the calpain/calpastatin system in cornea as a potential functional mechanism underlying the association.","method":"SNP genotyping, generalized estimating equation models in family cohort, logistic regression in case-control cohort, in silico expression analysis","journal":"Cornea","confidence":"Low","confidence_rationale":"Tier 4 — genetic association only, no direct mechanistic experiment; in silico inference","pmids":["23449483"],"is_preprint":false}],"current_model":"Calpastatin (CAST) is the endogenous, calcium-dependent inhibitor of calpains (μ- and m-calpain) that binds and blocks the calpain active site cleft only in the calcium-bound state—an interaction revealed at atomic resolution to involve looping around the catalytic cysteine to avoid cleavage; calpastatin itself is subject to proteolytic inactivation by caspases-1, -3, and -7 during apoptosis and by calpains in a feed-forward loop in neurodegeneration, and its depletion in Alzheimer's disease neurons drives cytoskeletal proteolysis and neuronal death that can be rescued by CAST overexpression; additionally, the same CAST gene encodes the RNA Polymerase I subunit hPAF49, which interacts with UBF to activate rDNA transcription, and loss-of-function CAST mutations cause PLACK syndrome through loss of calpastatin inhibitory activity in skin."},"narrative":{"teleology":[],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":[],"other_free_text":[]},"mechanistic_narrative":"Insufficient on-target evidence to synthesize a narrative — discovery timeline does not match the canonical CAST protein."},"prefetch_data":{"uniprot":{"accession":"P20810","full_name":"Calpastatin","aliases":["Calpain inhibitor","Sperm BS-17 component"],"length_aa":708,"mass_kda":76.6,"function":"Specific inhibition of calpain (calcium-dependent cysteine protease). Plays a key role in postmortem tenderization of meat and have been proposed to be involved in muscle protein degradation in living tissue","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P20810/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CAST","classification":"Not Classified","n_dependent_lines":36,"n_total_lines":1208,"dependency_fraction":0.029801324503311258},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CAST","total_profiled":1310},"omim":[{"mim_id":"618905","title":"SILVER-RUSSELL SYNDROME 2; SRS2","url":"https://www.omim.org/entry/618905"},{"mim_id":"617388","title":"AUTOINFLAMMATION WITH ARTHRITIS AND DYSKERATOSIS; AIADK","url":"https://www.omim.org/entry/617388"},{"mim_id":"617250","title":"ELKS/RAB6-INTERACTING/CAST FAMILY, MEMBER 2; ERC2","url":"https://www.omim.org/entry/617250"},{"mim_id":"616767","title":"CALPAIN, SMALL SUBUNIT 2; CAPNS2","url":"https://www.omim.org/entry/616767"},{"mim_id":"616295","title":"PEELING SKIN WITH LEUKONYCHIA, ACRAL PUNCTATE KERATOSES, CHEILITIS, AND KNUCKLE PADS; PLACK","url":"https://www.omim.org/entry/616295"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Endoplasmic reticulum","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Enhanced"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CAST"},"hgnc":{"alias_symbol":[],"prev_symbol":["MIR583HG"]},"alphafold":{"accession":"O15446","domains":[{"cath_id":"-","chopping":"33-52_60-120","consensus_level":"high","plddt":90.4568,"start":33,"end":120}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O15446","model_url":"https://alphafold.ebi.ac.uk/files/AF-O15446-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O15446-F1-predicted_aligned_error_v6.png","plddt_mean":55.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CAST","jax_strain_url":"https://www.jax.org/strain/search?query=CAST"},"sequence":{"accession":"O15446","fasta_url":"https://rest.uniprot.org/uniprotkb/O15446.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O15446/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O15446"}},"corpus_meta":[{"pmid":"10675905","id":"PMC_10675905","title":"Integrin signalling: a new Cas(t) of characters enters the stage.","date":"2000","source":"Trends in cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/10675905","citation_count":258,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12163476","id":"PMC_12163476","title":"Cast: a novel protein of the cytomatrix at the active zone of synapses that forms a ternary complex with RIM1 and munc13-1.","date":"2002","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/12163476","citation_count":239,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"8973158","id":"PMC_8973158","title":"Directing alternative splicing: cast and scenarios.","date":"1996","source":"Trends in genetics : TIG","url":"https://pubmed.ncbi.nlm.nih.gov/8973158","citation_count":185,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"7502998","id":"PMC_7502998","title":"Pet ownership, social support, and one-year survival after acute myocardial infarction in the Cardiac Arrhythmia Suppression Trial (CAST).","date":"1995","source":"The American journal of cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/7502998","citation_count":181,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19189073","id":"PMC_19189073","title":"Receptor for AGE (RAGE) and its ligands-cast into leading roles in diabetes and the inflammatory response.","date":"2009","source":"Journal of molecular medicine (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/19189073","citation_count":180,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"33626327","id":"PMC_33626327","title":"Quantitative evaluation of chromosomal rearrangements in gene-edited human stem cells by CAST-Seq.","date":"2021","source":"Cell stem cell","url":"https://pubmed.ncbi.nlm.nih.gov/33626327","citation_count":166,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"1737851","id":"PMC_1737851","title":"Pathobiology of cast nephropathy from human Bence Jones proteins.","date":"1992","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/1737851","citation_count":159,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"14734538","id":"PMC_14734538","title":"Physical and functional interaction of the active zone proteins, CAST, RIM1, and Bassoon, in neurotransmitter release.","date":"2004","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/14734538","citation_count":158,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11420714","id":"PMC_11420714","title":"Chromatin remodeling and transcriptional activation: the cast (in order of appearance).","date":"2001","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/11420714","citation_count":157,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"17222907","id":"PMC_17222907","title":"Fish cast NETs: neutrophil extracellular traps are released from fish neutrophils.","date":"2006","source":"Developmental and comparative immunology","url":"https://pubmed.ncbi.nlm.nih.gov/17222907","citation_count":136,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"35484322","id":"PMC_35484322","title":"Disentangling the relative importance of T cell responses in COVID-19: leading actors or supporting cast?","date":"2022","source":"Nature reviews. 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complexes.","date":"2015","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/26344197","citation_count":407,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8889548","id":"PMC_8889548","title":"Normalization and subtraction: two approaches to facilitate gene discovery.","date":"1996","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/8889548","citation_count":401,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19581569","id":"PMC_19581569","title":"Genome-wide association study of alcohol dependence.","date":"2009","source":"Archives of general psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/19581569","citation_count":301,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"28611215","id":"PMC_28611215","title":"Genome-wide CRISPR screen identifies HNRNPL as a prostate cancer dependency regulating RNA splicing.","date":"2017","source":"Proceedings of the National Academy of Sciences of the United States of 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calpastatin.","date":"2008","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/19020623","citation_count":264,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"28524877","id":"PMC_28524877","title":"Optimized fragmentation schemes and data analysis strategies for proteome-wide cross-link identification.","date":"2017","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/28524877","citation_count":221,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9705209","id":"PMC_9705209","title":"Caspase-mediated fragmentation of calpain inhibitor protein calpastatin during apoptosis.","date":"1998","source":"Archives of biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/9705209","citation_count":217,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9873017","id":"PMC_9873017","title":"Tumor necrosis factor-alpha-inducible IkappaBalpha proteolysis mediated by cytosolic m-calpain. A mechanism parallel to the ubiquitin-proteasome pathway for nuclear factor-kappab activation.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9873017","citation_count":213,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26618866","id":"PMC_26618866","title":"∆F508 CFTR interactome remodelling promotes rescue of cystic fibrosis.","date":"2015","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/26618866","citation_count":209,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"29568061","id":"PMC_29568061","title":"An AP-MS- and BioID-compatible MAC-tag enables comprehensive mapping of protein interactions and subcellular localizations.","date":"2018","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/29568061","citation_count":201,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"30711629","id":"PMC_30711629","title":"MET Inhibitors Promote Liver Tumor Evasion of the Immune Response by Stabilizing PDL1.","date":"2019","source":"Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/30711629","citation_count":165,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19913121","id":"PMC_19913121","title":"Gene-centric association signals for lipids and apolipoproteins identified via the HumanCVD BeadChip.","date":"2009","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19913121","citation_count":164,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45481,"output_tokens":3269,"usd":0.092739},"stage2":{"model":"claude-opus-4-6","input_tokens":6660,"output_tokens":3110,"usd":0.166575},"total_usd":0.433352,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":58680,"output_tokens":3978,"usd":0.117855},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6971,"output_tokens":104,"usd":0.056183}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"CAST (CAZ-associated structural protein) is a ~120 kDa cytomatrix protein at the active zone (CAZ) of synapses that directly binds RIM1 and indirectly binds Munc13-1 through RIM1, forming a ternary complex; Bassoon also associates with this complex, establishing a protein-interaction network at the CAZ.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, direct binding assays, immunofluorescence/immunoelectron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus direct binding assays plus localization, replicated in subsequent studies\",\n      \"pmids\": [\"12163476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CAST forms a large molecular complex with all known CAZ proteins (RIM1, Munc13-1, Bassoon, Piccolo) in the brain; RIM1 and Bassoon bind directly to distinct regions of CAST (COOH-terminus and central region, respectively); microinjection of the RIM1- or Bassoon-binding domain of CAST into superior cervical ganglion neurons impairs synaptic transmission, demonstrating that CAST interactions with these partners are required for neurotransmitter release.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, domain mapping, microinjection with electrophysiological readout\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including functional rescue/disruption in neurons\",\n      \"pmids\": [\"14734538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"A protein called CAST (CD3ε-associated signal transducer) specifically interacts in vivo and in vitro with CD3ε (but not CD3ζ or FcRγ) via the membrane-proximal region of CD3ε; CAST undergoes tyrosine phosphorylation upon TCR stimulation; dominant-negative CAST constructs suppress NFAT activation and IL-2 production, indicating CAST transduces activation signals through the CD3ε module of the TCR complex.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding, tyrosine phosphorylation assay, dominant-negative overexpression with NFAT reporter and IL-2 production readouts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods in single lab; note this CAST is a distinct protein (hPAF49/ASE-1) from the synaptic CAST, both present in this corpus\",\n      \"pmids\": [\"10373416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CAST/hPAF49 is an RNA polymerase I (Pol I)-specific subunit that interacts with the transcriptional activator UBF and weakly with SL1 at the rDNA promoter; growth-regulated tyrosine phosphorylation of CAST occurs specifically in initiation-competent Pol Iβ complexes; CAST-specific antibodies and excess CAST protein inhibit UBF-activated (but not basal) Pol I transcription, placing CAST as essential for UBF-dependent activation of rDNA transcription.\",\n      \"method\": \"Co-immunoprecipitation, in vitro transcription assay, antibody inhibition, phosphorylation analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro transcription reconstitution plus multiple orthogonal inhibition strategies in single rigorous study\",\n      \"pmids\": [\"16809778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CAST localizes at the base of synaptic ribbons in mouse retina (conventional and ribbon synapses), co-localizing with Bassoon and RIM at the presynaptic active zone, as determined by immunofluorescence and immunoelectron microscopy.\",\n      \"method\": \"Immunofluorescence, immunoelectron microscopy\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct localization by immunoelectron microscopy without functional manipulation in this paper\",\n      \"pmids\": [\"16485285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CAST directly associates with Ligand-of-Numb Protein X (LNX) via the COOH-terminus of CAST and the second PDZ domain of LNX, both in vivo and in vitro; the two proteins co-localize in axonal varicosities of cultured hippocampal neurons.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, in vitro binding, immunofluorescence co-localization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus yeast two-hybrid from single lab, no functional consequence tested\",\n      \"pmids\": [\"17257582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Calpastatin (CAST) is markedly depleted in Alzheimer's disease neurons by caspase-1, caspase-3, and calpains; CAST depletion coincides with calpain II and ERK1/2 activation, tau cleavage, and cytoskeletal proteolysis; CAST reduction via shRNA causes calpain-mediated neuronal death at sublethal calcium-injury levels; overexpression of human CAST in mice substantially reduces cytoskeletal proteolysis and neuronal death after intrahippocampal kainic acid injection.\",\n      \"method\": \"shRNA knockdown, transgenic overexpression in mice, immunohistochemistry, Western blot, in vivo kainic acid model\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD + OE + in vivo model) with defined mechanistic phenotype\",\n      \"pmids\": [\"19020018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"P/Q- and N-type voltage-dependent calcium channels (VDCCs) physically interact with Bassoon and CAST/Erc2 (via VDCC β1b or β4 subunits), as demonstrated by immunoprecipitation; double KO mice for P/Q- and N-type VDCCs show significantly reduced numbers of active zones and reduced Bassoon, Piccolo, and CAST/Erc2 at the neuromuscular junction, indicating VDCCs serve as scaffolds linking laminin β2 to active-zone proteins.\",\n      \"method\": \"Immunoprecipitation, double knockout mouse analysis, confocal and electron microscopy\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus genetic KO with quantitative ultrastructural phenotype\",\n      \"pmids\": [\"21228161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The active zone kinase SAD-B phosphorylates CAST at N-terminal serine 45 (S45) in a firing rate-dependent manner; phosphomimetic CAST (S45D) enhances short-term synaptic depression by delaying reloading of the readily releasable pool (RRP), mimicking CAST deletion; phosphonegative CAST (S45A) inhibits short-term depression and accelerates RRP reloading, establishing a CAST/SAD-B pathway that calibrates synaptic depression.\",\n      \"method\": \"In vitro kinase assay, phosphomimetic/phosphonegative mutagenesis, electrophysiology, CAST knockout mice\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay plus mutagenesis plus electrophysiological phenotype in neurons\",\n      \"pmids\": [\"27626661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CAST knockout in mouse hippocampus increases quantal size of miniature excitatory synaptic responses and impairs synaptic vesicle recycling specifically via the endosomal pathway (likely mediated by Rab6), leading to enhanced synaptic depression after prolonged activity.\",\n      \"method\": \"CAST knockout mouse, electrophysiology (mEPSC recording), electron microscopy, synaptic vesicle trafficking analysis\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific electrophysiological and ultrastructural phenotype in defined circuit\",\n      \"pmids\": [\"27422015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Pin1 (peptidyl-prolyl isomerase) interacts with calpastatin (CAST) as shown by co-IP and molecular docking; Pin1 regulates CAST phosphorylation, thereby modulating CAST/calpain2 activity; inhibition of Pin1 by juglone reduces glutamate-induced neuronal necrosis in retinal neurons in vitro and in vivo, placing Pin1 upstream of CAST in regulating calpain2-mediated necrosis.\",\n      \"method\": \"Co-immunoprecipitation, computer docking simulation, siRNA knockdown, Western blot, phosphorylation analysis, flow cytometry, in vivo glutamate excitotoxicity model\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus siRNA plus in vivo, but from single lab\",\n      \"pmids\": [\"29403356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A homozygous nonsense mutation (p.Glu182*) in CAST encoding calpastatin causes PLACK syndrome; skin fibroblasts from affected individuals show reduced calpastatin expression and reduced calpastatin inhibitory activity in vitro, demonstrating that loss of calpastatin function underlies this hereditary skin disorder.\",\n      \"method\": \"Whole exome sequencing, Sanger sequencing, qRT-PCR, immunoblot, in vitro calpastatin activity assay\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional enzyme activity assay plus expression analysis confirming loss of function in patient-derived cells\",\n      \"pmids\": [\"31392520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Combined deletion of CAST and ELKS in the calyx of Held reduces presynaptic terminal surface area and volume, increases active zone size, and reduces all CaV2 channel subtype currents and numbers without impairing synaptic transmission or plasticity, demonstrating that CAST/ELKS positively regulate presynaptic growth and suppress active zone expansion during early circuit maturation.\",\n      \"method\": \"CAST knockout and ELKS conditional knockout mice, confocal imaging, electron microscopy, patch-clamp electrophysiology\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double KO with quantitative morphological and electrophysiological phenotype\",\n      \"pmids\": [\"32304329\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CAST (calpastatin) functions as an endogenous inhibitor of calpain proteases and, at the presynaptic active zone, as a structural scaffolding protein that directly binds RIM1 (via its COOH-terminus) and Bassoon (via its central region), indirectly recruiting Munc13-1 to form a large CAZ complex essential for neurotransmitter release; its activity is regulated by SAD-B kinase phosphorylation at S45, which controls short-term synaptic depression by modulating readily releasable pool reloading, while in the nucleus it functions as an RNA Pol I-specific subunit required for UBF-activated rDNA transcription.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper and extract discoveries only from KEPT papers about the canonical CAST protein (calpastatin, the endogenous calpain inhibitor).\n\n**Classification Summary:**\n- Papers about calpastatin (CAST gene, endogenous calpain inhibitor): KEEP — PMIDs 19020018, 12163476, 14734538, 10373416, 16809778, 19020623, 2548504, 9705209, 9873017, 27626661, 21228161, 20581014, 16485285, 27422015, 17257582, 29275163, 32304329, 29403356, 31392520, 23449483, 200200\n- Papers about CAZ-CAST (presynaptic active zone protein): These are a DIFFERENT protein (CAST/ERC2/ELKS family, presynaptic scaffold). However, looking carefully: the gene symbol CAST in the context of \"CAZ-associated structural protein\" is a different gene from calpastatin CAST. These are separate genes — calpastatin (CAST, chromosome 5) vs. ERC2/CAST (chromosome 3). I'll classify the presynaptic active zone CAST papers separately — these describe a different protein.\n\nActually, re-examining: the corpus contains papers about TWO different proteins both called \"CAST\":\n1. **Calpastatin** (CAST gene, calpain inhibitor) \n2. **CAZ-associated structural protein** (also called CAST/ERC2, presynaptic active zone protein)\n\nThe gene2pubmed papers include calpastatin-related papers (PMID 19020623 about calpastatin structure, PMID 2548504, 9705209, 9873017). The presynaptic CAST (ERC2) papers are a different gene. I'll EXCLUDE the presynaptic CAST papers as alias collision.\n\n**KEPT (calpastatin):** 19020018, 10373416, 16809778, 19020623, 2548504, 9705209, 9873017, 29403356, 31392520, 23449483, 76 (meat tenderness SNP — excludable as no mechanism), 100 (PLACK syndrome with functional assay — KEEP)\n\n**EXCLUDED (presynaptic CAZ-CAST/ERC2):** 12163476, 14734538, 20581014, 16485285, 17257582, 29275163, 32304329, 27626661, 27422015, 21228161, 51 (ELKS)\n\nAll other papers are unrelated (Cardiac Arrhythmia Suppression Trial, materials science, cichlids, etc.) — EXCLUDE.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structure of calcium-bound calpain 2 heterodimer bound by an inhibitory domain of calpastatin at 2.4-Å resolution revealed the mechanism of inhibition: calpastatin occupies both sides of the active site cleft, passes through the cleft but escapes cleavage by looping around the active site cysteine, and recognizes multiple lower-affinity sites present only in the calcium-bound form of calpain. The structure also revealed conformational changes calpain undergoes upon calcium binding, including opening of the active site cleft and domain compaction.\",\n      \"method\": \"X-ray crystallography (2.4 Å resolution crystal structure of calpain 2–calpastatin inhibitory domain complex)\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with direct mechanistic interpretation of inhibition mechanism; single paper but multiple orthogonal structural analyses\",\n      \"pmids\": [\"19020623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"Calpastatin was established as the endogenous intracellular inhibitor of calpains (calpain I/μ-calpain and calpain II/m-calpain). Structure–function analysis using mutated cDNAs expressed in E. coli defined the inhibitory domains of calpastatin. Interleukin-2 receptor-linked expression of calpastatin was demonstrated in HTLV-I-infected T-cells, and calpastatin was shown to inhibit calcium-dependent calpain proteolytic activity.\",\n      \"method\": \"Biochemical inhibition assays, site-directed mutagenesis of cDNA expressed in E. coli, cell-based expression studies\",\n      \"journal\": \"Biochemistry international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — foundational biochemical reconstitution and mutagenesis; replicated across labs over decades\",\n      \"pmids\": [\"2548504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Calpastatin is cleaved by caspases during early apoptosis. In anti-Fas or staurosporine-treated Jurkat T-cells and apoptotic SH-SY5Y neuroblastoma cells, the high-molecular-weight form of calpastatin (110 kDa) was degraded to immunoreactive fragments (75 kDa, 30 kDa). In vitro, recombinant caspase-1, -3, and -7 all cleaved calpastatin; caspase-1 cleaved at ALDD137↓L, LSSD203↓F, and ALAD404↓S (in domains I and III), while caspase-3 cleaved only at ALDD137↓L. Cleavage was blocked by caspase-specific inhibitors. Notably, caspase-1-fragmented calpastatin retained near-normal calpain inhibitory activity, suggesting that caspase-mediated fragmentation has effects beyond loss of calpain inhibition.\",\n      \"method\": \"In vitro cleavage assays with recombinant caspases, immunoblot of apoptotic cells, caspase inhibitor pretreatment, in vitro translation\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstituted in vitro with defined recombinant enzymes, site-specific cleavage mapped, confirmed in two cell types\",\n      \"pmids\": [\"9705209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Calpastatin overexpression partially blocked TNF-α-inducible IκBα proteolysis and NF-κB-dependent promoter activity in HepG2 cells, demonstrating that cytosolic m-calpain mediates a proteasome-independent pathway for IκBα degradation and NF-κB activation in parallel to the ubiquitin-proteasome pathway.\",\n      \"method\": \"Transient cotransfection with calpastatin expression construct, fluorescent calpain activity assay, NF-κB reporter assay, cell fractionation, broken-cell reconstitution with purified m-calpain\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including reconstitution with purified enzyme, genetic (calpastatin overexpression) and pharmacological inhibition, confirmed in ubiquitin-deficient ts20b cells\",\n      \"pmids\": [\"9873017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CAST (CD3ε-associated signal transducer, later identified as hPAF49/RNA Pol I subunit) was isolated as a novel CD3ε-binding protein. It specifically interacts in vivo and in vitro with CD3ε but not CD3ζ or FcRγ, via a unique membrane-proximal region of CD3ε. CAST contains a single tyrosine that undergoes tyrosine phosphorylation upon TCR stimulation. Dominant-negative CAST constructs (minimum CD3ε-binding domain or tyrosine mutant) strongly suppressed NFAT activation and IL-2 production, indicating CAST transduces activation signals through the CD3ε-containing TCR signaling module.\",\n      \"method\": \"Co-immunoprecipitation (in vivo and in vitro), yeast two-hybrid, dominant-negative overexpression, NFAT-luciferase reporter assay, IL-2 ELISA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — reciprocal co-IP plus functional dominant-negative phenotype, single lab; note this paper's CAST is a distinct protein (hPAF49) from calpastatin, but both share the CAST symbol and are in the corpus\",\n      \"pmids\": [\"10373416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The human RNA Polymerase I-specific subunit CAST (also called hPAF49, previously identified as CD3ε-associated CAST) was characterized as an integral component of initiation-competent Pol Iβ complexes. CAST/hPAF49 undergoes growth-regulated tyrosine phosphorylation at a conserved residue. It interacts with the activator UBF and weakly with SL1 at the rDNA promoter. CAST/hPAF49-specific antibodies and excess CAST/hPAF49 protein inhibit UBF-activated transcription but not basal Pol I transcription, and disrupt the CAST/hPAF49–UBF interaction, indicating that its interaction with UBF is required for transcriptional activation.\",\n      \"method\": \"Immunoprecipitation, in vitro transcription assay, antibody inhibition, chromatin immunoprecipitation, phosphorylation analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical methods (co-IP, in vitro transcription inhibition, ChIP) in single lab; functional consequence of CAST–UBF interaction directly demonstrated\",\n      \"pmids\": [\"16809778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In Alzheimer's disease neurons, calpastatin (CAST) is markedly depleted through proteolysis mediated by caspase-1, caspase-3, and calpains themselves, creating a feed-forward loop. CAST depletion along dendrites coincides topographically with calpain II and ERK1/2 activation, caspase-3-mediated tau cleavage, and tau/neurofilament hyperphosphorylation. In mice, intrahippocampal kainic acid administration reproduced these changes and caused cytoskeletal proteolysis and neuronal death; these effects were substantially reduced in mice overexpressing human CAST. shRNA-mediated CAST reduction in neuronal cells caused calpain-mediated death at calcium-injury levels sublethal to CAST-expressing cells.\",\n      \"method\": \"Immunofluorescence/immunohistochemistry of AD brain, intrahippocampal kainic acid mouse model, transgenic CAST overexpression, shRNA knockdown in neuronal cells, cell death assays (propidium iodide, LDH)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (human tissue, mouse KA model, transgenic rescue, shRNA KD) with consistent mechanistic findings across methods\",\n      \"pmids\": [\"19020018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Pin1 (peptidyl-prolyl cis/trans isomerase) interacts with calpastatin (CAST) and regulates CAST activity, thereby modulating CAST/calpain2-mediated necrosis in retinal neurons under glutamate excitotoxicity. Co-IP and computer simulation confirmed Pin1–CAST binding. Juglone (Pin1 inhibitor) reduced CAST phosphorylation and shifted CAST/calpain2 balance to decrease necrosis; siRNA knockdown of Pin1 in RGC-5 cells confirmed the regulatory pathway. In vivo, Pin1 inhibition protected retinal ganglion cells from glutamate-induced damage.\",\n      \"method\": \"Co-immunoprecipitation, computer simulation (docking), western blot, real-time qPCR, siRNA knockdown, flow cytometry, propidium iodide staining, LDH assay, flash electroretinogram\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP plus siRNA functional rescue plus in vivo validation, single lab\",\n      \"pmids\": [\"29403356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A homozygous nonsense mutation in CAST (c.544G>T, p.Glu182*) causes PLACK syndrome (peeling skin, leukonychia, acral keratoses, cheilitis, knuckle pads). Real-time qRT-PCR and immunoblot analysis of skin fibroblasts from affected individuals showed reduced calpastatin expression, and in vitro calpastatin activity assays demonstrated decreased inhibitory activity, establishing loss of calpastatin function as the causative mechanism.\",\n      \"method\": \"Whole exome sequencing, Sanger sequencing validation, real-time qRT-PCR, immunoblot, in vitro calpastatin activity assay\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct functional assay of calpastatin activity in patient-derived cells, complemented by expression analysis; validates causative role of CAST loss-of-function\",\n      \"pmids\": [\"31392520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Genetic association analysis mapped a CAST gene SNP (rs4434401) to keratoconus susceptibility in both familial and case-control cohorts (combined meta P=0.002), with in silico analysis suggesting differential regulation of the calpain/calpastatin system in cornea as a potential functional mechanism underlying the association.\",\n      \"method\": \"SNP genotyping, generalized estimating equation models in family cohort, logistic regression in case-control cohort, in silico expression analysis\",\n      \"journal\": \"Cornea\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — genetic association only, no direct mechanistic experiment; in silico inference\",\n      \"pmids\": [\"23449483\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Calpastatin (CAST) is the endogenous, calcium-dependent inhibitor of calpains (μ- and m-calpain) that binds and blocks the calpain active site cleft only in the calcium-bound state—an interaction revealed at atomic resolution to involve looping around the catalytic cysteine to avoid cleavage; calpastatin itself is subject to proteolytic inactivation by caspases-1, -3, and -7 during apoptosis and by calpains in a feed-forward loop in neurodegeneration, and its depletion in Alzheimer's disease neurons drives cytoskeletal proteolysis and neuronal death that can be rescued by CAST overexpression; additionally, the same CAST gene encodes the RNA Polymerase I subunit hPAF49, which interacts with UBF to activate rDNA transcription, and loss-of-function CAST mutations cause PLACK syndrome through loss of calpastatin inhibitory activity in skin.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CAST encompasses two distinct gene products studied under the same symbol: a presynaptic cytomatrix-associated structural protein (CAST/ERC2) and the endogenous calpain inhibitor calpastatin. As a presynaptic active zone scaffold, CAST directly binds RIM1 (via its COOH-terminus) and Bassoon (via its central region), indirectly recruiting Munc13-1 to form a large cytomatrix at the active zone (CAZ) complex essential for neurotransmitter release; disruption of these interactions impairs synaptic transmission, and CAST knockout increases quantal size, impairs endosomal synaptic vesicle recycling, and enhances synaptic depression [PMID:12163476, PMID:14734538, PMID:27422015]. SAD-B kinase phosphorylates CAST at S45 in a firing-rate-dependent manner, calibrating readily releasable pool reloading and short-term synaptic depression [PMID:27626661]. As calpastatin, CAST is the endogenous inhibitor of calpain proteases whose depletion in neurons unleashes calpain-mediated cytoskeletal proteolysis and cell death; loss-of-function mutations in CAST cause PLACK syndrome [PMID:19020018, PMID:31392520].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Before this work, whether the CD3ε subunit of the TCR engaged a dedicated signaling adaptor was unclear; this study identified a protein termed CAST (later recognized as hPAF49/ASE-1, distinct from synaptic CAST) that binds CD3ε, undergoes tyrosine phosphorylation upon TCR engagement, and transduces signals to NFAT/IL-2, establishing a CD3ε-specific signaling branch.\",\n      \"evidence\": \"Co-IP, in vitro binding, dominant-negative overexpression with NFAT reporter and IL-2 readouts in T cells\",\n      \"pmids\": [\"10373416\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding; independent confirmation of CD3ε specificity needed\", \"Downstream signaling intermediates between CAST and NFAT not identified\", \"Relationship to hPAF49 Pol I function not resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"The molecular composition of the presynaptic cytomatrix at the active zone (CAZ) was poorly defined; the identification of CAST as a ~120 kDa CAZ protein that directly binds RIM1 and indirectly recruits Munc13-1 established the first defined protein-interaction scaffold at the active zone.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal co-IP, direct binding assays, immunofluorescence and immunoelectron microscopy in neurons\",\n      \"pmids\": [\"12163476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence for synaptic transmission not yet tested\", \"Bassoon binding site on CAST not mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Building on the initial identification of CAST-RIM1 binding, this work mapped distinct binding domains on CAST for RIM1 (COOH-terminus) and Bassoon (central region), showed CAST forms a large complex with all known CAZ proteins, and demonstrated via microinjection that disrupting CAST-RIM1 or CAST-Bassoon interactions impairs neurotransmitter release, establishing CAST as a functionally required scaffold.\",\n      \"evidence\": \"Domain mapping, co-IP, in vitro binding, microinjection of blocking fragments with electrophysiology in superior cervical ganglion neurons\",\n      \"pmids\": [\"14734538\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No CAST knockout phenotype yet available\", \"Mechanism by which CAST disruption impairs release (docking vs. priming vs. fusion) not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Two parallel advances refined CAST biology: immunoelectron microscopy placed CAST at the base of synaptic ribbons in retinal synapses, extending its role beyond conventional synapses; separately, CAST/hPAF49 was shown to be an RNA Pol I-specific subunit required for UBF-activated rDNA transcription, revealing a nuclear function for a CAST gene product.\",\n      \"evidence\": \"Immunoelectron microscopy in mouse retina; in vitro Pol I transcription reconstitution with antibody inhibition and phosphorylation analysis\",\n      \"pmids\": [\"16485285\", \"16809778\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the synaptic CAST and Pol I CAST derive from the same gene locus was not clarified\", \"How tyrosine phosphorylation of CAST/hPAF49 is regulated by growth signals is unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The neuroprotective role of calpastatin (CAST) was established: CAST is depleted in Alzheimer's disease neurons by caspases and calpains, and its loss permits unchecked calpain-mediated cytoskeletal proteolysis and neuronal death, while transgenic CAST overexpression protects against excitotoxic neurodegeneration in vivo.\",\n      \"evidence\": \"shRNA knockdown, transgenic overexpression in mice, kainic acid excitotoxicity model, immunohistochemistry and Western blot\",\n      \"pmids\": [\"19020018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CAST depletion is a cause or consequence of early AD pathology not resolved\", \"Specific calpain substrates whose cleavage drives death upon CAST loss not fully catalogued\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"How active zone proteins are organized relative to calcium channels was unclear; this study showed that P/Q- and N-type VDCCs physically associate with Bassoon and CAST via VDCC β subunits, and that VDCC double knockout reduces active zone number and CAST abundance, positioning VDCCs as upstream scaffolds for CAZ assembly.\",\n      \"evidence\": \"Co-IP, VDCC double-KO mice, confocal and electron microscopy at the neuromuscular junction\",\n      \"pmids\": [\"21228161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CAST binding to VDCC β subunits is direct or mediated by Bassoon not resolved\", \"Functional consequence for synaptic transmission at this NMJ not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Two studies revealed how CAST regulates synaptic vesicle dynamics: SAD-B kinase phosphorylates CAST at S45 in a firing-rate-dependent manner to control readily releasable pool reloading and short-term depression, while CAST knockout increases quantal size and impairs endosomal vesicle recycling, establishing CAST as a dynamic regulator of presynaptic function rather than a static scaffold.\",\n      \"evidence\": \"In vitro kinase assay, phosphomimetic/phosphonegative mutagenesis and electrophysiology in CAST-KO neurons; CAST-KO mEPSC recording, EM, vesicle recycling analysis\",\n      \"pmids\": [\"27626661\", \"27422015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How S45 phosphorylation alters CAST-RIM1 or CAST-Bassoon interactions is unknown\", \"Identity of the endosomal recycling pathway (Rab6 involvement) needs direct testing\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Pin1 was identified as an upstream regulator of calpastatin (CAST) phosphorylation, modulating CAST/calpain2 activity and glutamate-induced neuronal necrosis in retinal neurons.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, phosphorylation analysis, in vivo glutamate excitotoxicity model in retina\",\n      \"pmids\": [\"29403356\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding without independent replication\", \"Specific phosphorylation sites on CAST regulated by Pin1 not identified\", \"Whether Pin1-CAST interaction is direct awaits structural confirmation\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A homozygous nonsense mutation (p.Glu182*) in CAST was shown to cause PLACK syndrome, with patient fibroblasts displaying reduced calpastatin expression and inhibitory activity, establishing the first Mendelian disease caused by calpastatin loss of function.\",\n      \"evidence\": \"Whole exome sequencing, Sanger sequencing, qRT-PCR, immunoblot, in vitro calpastatin activity assay in patient fibroblasts\",\n      \"pmids\": [\"31392520\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Only one family reported; additional allelic series needed\", \"Mechanism linking calpain hyperactivity to the specific skin phenotype not elucidated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Combined CAST/ELKS deletion at the calyx of Held revealed that these proteins promote presynaptic terminal growth and constrain active zone size during circuit maturation, while reducing CaV2 channel numbers without impairing basic transmission, indicating redundancy among CAZ scaffolds.\",\n      \"evidence\": \"Double KO (CAST−/−; ELKS cKO), confocal and electron microscopy, patch-clamp electrophysiology at calyx of Held\",\n      \"pmids\": [\"32304329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual contributions of CAST vs. ELKS not fully dissected\", \"How CAST/ELKS regulate CaV2 channel number mechanistically is unknown\", \"Whether compensatory mechanisms preserve transmission in the double KO was not explored\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: how S45 phosphorylation by SAD-B structurally modifies CAST interactions with CAZ partners, whether the synaptic scaffold and calpain-inhibitory functions of CAST are executed by different isoforms or splice variants from the same locus, and what molecular pathway links calpastatin loss to the skin phenotype in PLACK syndrome.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of CAST in complex with RIM1 or Bassoon\", \"Isoform-specific functions not resolved\", \"Tissue-specific regulatory mechanisms of CAST expression and turnover not characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 11]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 12]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1, 8, 9, 12]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 11]}\n    ],\n    \"complexes\": [\n      \"Cytomatrix at the active zone (CAZ) complex\",\n      \"RNA Polymerase I (Pol Iβ) complex\"\n    ],\n    \"partners\": [\n      \"RIM1\",\n      \"BSN\",\n      \"MUNC13-1\",\n      \"PCLO\",\n      \"SAD-B\",\n      \"LNX1\",\n      \"PIN1\",\n      \"UBF\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Insufficient on-target evidence to synthesize a narrative — discovery timeline does not match the canonical CAST protein.\",\n  \"teleology\": [],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```"}