{"gene":"CAST","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2002,"finding":"CAST (CAZ-associated structural protein) is a ~120 kDa presynaptic cytomatrix protein that directly binds RIM1 and indirectly binds Munc13-1 through RIM1, forming a ternary complex; Bassoon also associates with this complex. CAST localizes at the cytomatrix at the active zone (CAZ) of conventional synapses in mouse brain and is partly co-transported with Bassoon and RIM1 on the same vesicles during synapse formation.","method":"Biochemical purification from rat brain, co-immunoprecipitation, direct binding assays, immunofluorescence, immunoelectron microscopy, immunoisolation of transport vesicles","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and direct binding assays with multiple orthogonal methods (co-IP, pulldown, immunoelectron microscopy, vesicle immunoisolation) in a focused mechanistic study","pmids":["12163476"],"is_preprint":false},{"year":2004,"finding":"CAST forms a large molecular complex in brain with RIM1, Munc13-1, Bassoon, and Piccolo. RIM1 binds directly to the C-terminus of CAST and Bassoon binds to the central region of CAST, forming a ternary complex; Piccolo also binds the Bassoon-binding region of CAST. Microinjection of the RIM1-binding or Bassoon-binding regions of CAST into cultured superior cervical ganglion neurons impairs synaptic transmission, demonstrating that CAST-RIM1 and CAST-Bassoon interactions are required for neurotransmitter release.","method":"Co-immunoprecipitation from brain lysates, direct binding assays with recombinant proteins, domain-mapping, microinjection of peptide fragments into cultured neurons with electrophysiological readout","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding domain mapping combined with functional loss-of-function (microinjection) and electrophysiology, multiple orthogonal methods","pmids":["14734538"],"is_preprint":false},{"year":2004,"finding":"CAST2 (rat orthologue of human ELKS/Rab6IP2/ERC1) is a structural paralogue of CAST1 that directly binds RIM1 and forms a hetero-oligomer with CAST1; CAST2 localizes to the presynaptic active zone vicinity in mouse brain and co-localizes with Bassoon at hippocampal synapses.","method":"Subcellular fractionation, co-immunoprecipitation, direct binding assays, immunofluorescence, immunoelectron microscopy in primary neurons and mouse brain","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus direct binding assays and immunoelectron microscopy, single lab with multiple orthogonal methods","pmids":["14723704"],"is_preprint":false},{"year":2006,"finding":"CAST and ELKS are components of both conventional and ribbon synapses in mouse retina, localizing at the base of synaptic ribbons presynaptically (CAST) or around ribbons (ELKS), as well as at the presynaptic membrane of GABAergic and glycinergic conventional synapses; both co-localize with Bassoon and RIM.","method":"Immunofluorescence, immunoelectron microscopy in mouse retina","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunoelectron microscopy provides direct subcellular localization at high resolution, single lab with two orthogonal imaging methods","pmids":["16485285"],"is_preprint":false},{"year":2007,"finding":"CAST directly associates with Ligand-of-Numb Protein X (LNX) both in vivo and in vitro; the interaction requires the C-terminus of CAST and the second PDZ domain of LNX. Exogenously expressed LNX partially co-localizes with endogenous CAST at axonal varicosities of hippocampal neurons.","method":"Yeast two-hybrid screening, in vivo co-immunoprecipitation, in vitro binding assay, co-localization in heterologous expression system and primary hippocampal neurons","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by in vivo and in vitro binding assays with domain mapping, single lab","pmids":["17257582"],"is_preprint":false},{"year":2008,"finding":"Calpastatin (CAST) is markedly depleted from Alzheimer's disease (AD) neurons via cleavage by caspase-1, caspase-3, and calpains. Initial CAST depletion along dendrites coincides with calpain II and ERK1/2 activation, tau cleavage by caspase-3, and tau/neurofilament hyperphosphorylation. In mice, CAST depletion after intrahippocampal kainic acid causes cytoskeletal proteolysis and neuronal death that are substantially reduced in mice overexpressing human CAST. shRNA-mediated CAST reduction in neuronal cells causes calpain-mediated death at sublethal calcium injury levels.","method":"Western blot and immunofluorescence in AD brain tissue, mouse kainic acid model with CAST transgenic overexpression, shRNA knockdown in neuronal cell lines, calpain activity assays","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function (shRNA), gain-of-function (transgenic overexpression), and in vivo model with multiple molecular readouts across multiple orthogonal methods","pmids":["19020018"],"is_preprint":false},{"year":2009,"finding":"Five active zone proteins converge on an interaction node centered on the N-terminal region of Munc13-1: the zinc-finger domain of RIM1, the C-terminal region of Bassoon, a segment of CAST1/ELKS2, and the third coiled-coil domain (CC3) of Aczonin/Piccolo or Bassoon all interact with Munc13-1's N-terminal region. Recombinant Aczonin-CC3 expressed in neurons targets to synapses and suppresses vesicle turnover.","method":"Yeast two-hybrid, co-immunoprecipitation, recombinant protein binding assays, domain mapping, expression of GFP-fusion in cultured neurons with functional assay","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple binding assays with domain mapping and functional neuronal assay, single lab but multiple orthogonal methods","pmids":["19812333"],"is_preprint":false},{"year":1999,"finding":"CAST (CD3epsilon-associated signal transducer, later identified as RNA Pol I subunit) specifically interacts in vivo and in vitro with CD3epsilon (but not CD3zeta or FcRgamma) via a unique membrane-proximal region of CD3epsilon. CAST undergoes tyrosine phosphorylation upon TCR stimulation. Dominant-negative CAST constructs (minimum CD3epsilon-binding domain or tyrosine mutant) suppress NFAT activation and IL-2 production, placing CAST as a component of the preformed TCR complex that transduces activation signals via the CD3epsilon module.","method":"Co-immunoprecipitation in vivo and in vitro binding assay, tyrosine phosphorylation assay, overexpression of dominant-negative constructs with NFAT luciferase reporter and IL-2 ELISA","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro binding with domain specificity, functional dominant-negative with two readouts, single lab","pmids":["10373416"],"is_preprint":false},{"year":2006,"finding":"CAST/hPAF49 is a human RNA polymerase I (Pol I)-specific subunit that undergoes growth-regulated tyrosine phosphorylation specifically in initiation-competent Pol Ibeta complexes. CAST/hPAF49 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 (but not basal) Pol I transcription and disrupt UBF–CAST/hPAF49 interaction, indicating that this Pol I-specific subunit interaction with UBF is required for transcriptional activation.","method":"Immunoprecipitation of Pol I complexes, tyrosine phosphorylation assay, in vitro transcription with antibody inhibition and recombinant protein competition, promoter binding assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro transcription reconstitution, co-IP of endogenous complex, phosphorylation analysis, and functional inhibition assays, multiple orthogonal methods in single lab","pmids":["16809778"],"is_preprint":false},{"year":2016,"finding":"Kaposi sarcoma-associated herpesvirus (KSHV) reduces CAST (calpastatin) expression in THP-1 monocytoid cells and primary monocytes, and this reduction of CAST consequently decreases ATG5 expression and inhibits autophagy, thereby impairing monocyte differentiation into dendritic cells. This places CAST upstream of ATG5 in the autophagy pathway exploited by KSHV for immune evasion.","method":"Western blot for CAST and ATG5 protein levels in KSHV-infected cells, autophagy flux assays, monocyte differentiation assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab with multiple biochemical readouts establishing pathway order (CAST→ATG5→autophagy), but no reconstitution or direct mutagenesis","pmids":["27715410"],"is_preprint":false},{"year":2016,"finding":"SAD-B kinase phosphorylates the N-terminal serine 45 (S45) of CAST at the presynaptic active zone; phosphorylation of S45 increases with higher firing rates. A phosphomimetic CAST (S45D) mimics CAST deletion by enhancing short-term synaptic depression (STD) through delayed reloading of the readily releasable pool (RRP). A phosphonegative CAST (S45A) inhibits STD and accelerates RRP reloading. Thus, SAD-B/CAST-S45 phosphorylation acts as a molecular brake on synaptic transmission by controlling RRP size.","method":"In vitro kinase assay (SAD-B phosphorylating CAST S45), phosphomimetic and phosphonegative CAST mutant expression in neurons, electrophysiology (patch clamp) for RRP and STD measurements, firing-rate-dependent phosphorylation assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis (phosphomimetic/phosphonegative) combined with electrophysiology, single lab with multiple orthogonal methods","pmids":["27626661"],"is_preprint":false},{"year":2016,"finding":"CAST knockout mice show increased miniature excitatory postsynaptic response (mEPSC) amplitude in CA1 hippocampus and larger synaptic depression after prolonged activation. The enlarged quantal size is attributable to selective impairment of synaptic vesicle trafficking via the endosome (likely mediated by Rab6) in presynaptic terminals, indicating that CAST regulates both quantal size and endosomal vesicle recycling.","method":"CAST knockout mouse, whole-cell patch clamp in hippocampal slices (mEPSC and synaptic depression recordings), immunoelectron microscopy, subcellular fractionation, Rab6 pathway analysis","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with defined electrophysiological phenotype plus ultrastructural and pathway analysis, single lab with multiple orthogonal methods","pmids":["27422015"],"is_preprint":false},{"year":2018,"finding":"Pin1 (peptidyl-prolyl isomerase) binds CAST (calpastatin) as shown by co-IP and computer simulation; Pin1 regulates CAST expression and phosphorylation state. Inhibition of Pin1 with juglone reduces glutamate-induced calpain2 activation and neuronal necrosis in retinal neurons via the CAST/calpain2 pathway. siRNA knockdown confirmed the Pin1-CAST/calpain2 signaling pathway in glutamate excitotoxicity in vivo.","method":"Co-immunoprecipitation, computer docking simulation, Western blot with Pin1 inhibitor (juglone), siRNA knockdown, PI staining and LDH assay for necrosis, flow cytometry, in vivo rat retinal model, flash ERG","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus siRNA functional validation in vitro and in vivo, single lab, multiple methods but no reconstitution","pmids":["29403356"],"is_preprint":false},{"year":2019,"finding":"A homozygous nonsense mutation (c.544G>T, p.Glu182*) in CAST (calpastatin) causes PLACK syndrome (peeling skin, leukonychia, acral punctate keratoses, cheilitis and knuckle pads). Real-time qRT-PCR and immunoblot showed reduced calpastatin expression in skin fibroblasts from affected individuals. In vitro calpastatin activity assays confirmed decreased inhibitory activity, establishing that loss of calpastatin function underlies this skin disorder.","method":"Whole exome sequencing, Sanger confirmation, qRT-PCR, immunoblot, in vitro calpastatin activity assay in patient fibroblasts","journal":"Cell and tissue research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — enzymatic activity assay in patient-derived cells plus molecular confirmation of protein loss, single lab, multiple orthogonal methods","pmids":["31392520"],"is_preprint":false},{"year":2020,"finding":"Combined deletion of CAST and ELKS at the calyx of Held results in reduced presynaptic terminal surface area and volume, increased active zone size, and reduction of all CaV2 channel subtype currents correlating with fewer presynaptic CaV2 channel numbers. These morphological and channel-level changes do not impair synaptic transmission or plasticity, indicating that CAST/ELKS are positive regulators of presynaptic growth and suppressors of active zone expansion and CaV2 channel levels during development, with developmental compensation preserving transmission.","method":"CAST knockout and ELKS conditional knockout mice, confocal morphological analysis, electron microscopy of active zone ultrastructure, patch clamp electrophysiology for CaV2 currents and synaptic transmission at calyx of Held","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — double KO with defined morphological and electrophysiological phenotypes at a well-characterized synapse, multiple orthogonal methods in single lab","pmids":["32304329"],"is_preprint":false}],"current_model":"CAST encodes calpastatin, the endogenous inhibitor of calpain proteases, whose depletion by caspases and calpains themselves drives calpain dysregulation in neurodegeneration and skin disease (PLACK syndrome); the same gene locus also produces a presynaptic active zone scaffold protein (CAZ-CAST) that directly binds RIM1 (C-terminus) and Bassoon (central region), indirectly recruits Munc13-1 and Piccolo into a large multi-protein complex, regulates neurotransmitter release, controls presynaptic CaV2 channel levels and active zone morphology during development, and undergoes SAD-B-mediated phosphorylation at S45 to modulate readily releasable pool reloading and short-term synaptic depression; additionally, the CAST/hPAF49 protein is a Pol I-specific subunit whose UBF interaction is required for activated rDNA transcription."},"narrative":{"mechanistic_narrative":"The CAST symbol resolves in this corpus to multiple distinct proteins that share the acronym. The dominant entity is CAST/ERC1-family CAZ-associated structural protein, a ~120 kDa scaffold of the presynaptic cytomatrix at the active zone that organizes the neurotransmitter-release machinery [PMID:12163476]. CAST directly binds the C-terminus of RIM1 and the central region of Bassoon, and through these contacts assembles a large complex that also incorporates Munc13-1 and Piccolo; microinjection of the RIM1- or Bassoon-binding fragments disrupts these interactions and impairs neurotransmitter release, establishing the scaffold as functionally required for transmission [PMID:14734538, PMID:19812333]. It heterodimerizes with the paralog CAST2/ELKS and localizes to both conventional and ribbon synapses [PMID:14723704, PMID:16485285]. Functionally, CAST regulates quantal size and endosomal synaptic-vesicle recycling, with knockout enlarging mEPSC amplitude and deepening synaptic depression [PMID:27422015], and CAST/ELKS together act as positive regulators of presynaptic growth that restrain active zone size and set presynaptic CaV2 channel levels during development [PMID:32304329]. SAD-B kinase phosphorylates CAST at S45 in a firing-rate-dependent manner, and this modification serves as a brake on transmission by slowing readily-releasable-pool reloading [PMID:27626661]. Distinct from this scaffold, the same symbol denotes calpastatin, the endogenous calpain inhibitor whose caspase- and calpain-mediated depletion drives cytoskeletal proteolysis and neuronal death in Alzheimer's disease and excitotoxic models [PMID:19020018, PMID:29403356]; a homozygous nonsense mutation (p.Glu182*) in calpastatin causes PLACK syndrome through loss of calpain-inhibitory activity [PMID:31392520]. A third usage, CAST/hPAF49, identifies a human RNA polymerase I-specific subunit whose UBF interaction is required for activated rDNA transcription [PMID:16809778], and an early report assigned CAST to a CD3epsilon-associated TCR signaling role [PMID:10373416].","teleology":[{"year":1999,"claim":"Established a CAST entity as a CD3epsilon-associated signal transducer within the preformed TCR complex, raising the question of how the membrane-proximal CD3epsilon module couples to downstream activation.","evidence":"Co-IP and in vitro binding with CD3epsilon, tyrosine-phosphorylation assay, dominant-negative constructs with NFAT reporter and IL-2 ELISA in T cells","pmids":["10373416"],"confidence":"Medium","gaps":["This usage of CAST is not reconciled with the later scaffold and Pol I subunit identities","Direct enzymatic or adaptor activity in TCR signaling not defined","No structural data on the CD3epsilon interaction"]},{"year":2002,"claim":"Identified CAST as a presynaptic active-zone scaffold that directly binds RIM1 and bridges to Munc13-1 and Bassoon, answering how active-zone components are physically organized.","evidence":"Biochemical purification from rat brain, co-IP, direct binding assays, immunoelectron microscopy, transport-vesicle immunoisolation","pmids":["12163476"],"confidence":"High","gaps":["Functional requirement for transmission not yet shown","Stoichiometry and higher-order assembly undefined"]},{"year":2004,"claim":"Mapped the binding domains within the CAST complex and showed the interactions are functionally required for release, moving from architecture to causal mechanism.","evidence":"Co-IP, domain mapping, microinjection of CAST fragments into SCG neurons with electrophysiology; subcellular fractionation and IEM for the CAST2/ELKS paralog","pmids":["14734538","14723704"],"confidence":"High","gaps":["Quantitative contribution of each interaction to release kinetics unresolved","Hetero-oligomer stoichiometry of CAST1/CAST2 unknown"]},{"year":2006,"claim":"Extended CAST localization to ribbon and conventional synapses and resolved the convergence of five active-zone proteins on the Munc13-1 N-terminal node, clarifying the topology of the release scaffold.","evidence":"IEM in mouse retina; yeast two-hybrid, co-IP, domain mapping and neuronal functional assay for the Munc13-1 interaction node","pmids":["16485285","19812333"],"confidence":"High","gaps":["Spatial assembly order at the active zone not directly visualized","Whether all five contacts are simultaneous or mutually exclusive unclear"]},{"year":2006,"claim":"Defined a CAST/hPAF49 entity as a Pol I-specific subunit whose UBF interaction is required for activated rDNA transcription, addressing how growth signals are relayed to ribosomal RNA synthesis.","evidence":"IP of Pol I complexes, tyrosine-phosphorylation analysis, in vitro transcription with antibody inhibition and recombinant competition, promoter binding","pmids":["16809778"],"confidence":"High","gaps":["Relationship of this subunit to the presynaptic CAST scaffold not addressed","Kinase responsible for growth-regulated phosphorylation unidentified"]},{"year":2008,"claim":"Showed that calpastatin (CAST) is depleted by caspases and calpains in Alzheimer's disease and that its loss drives calpain-mediated cytoskeletal proteolysis and neuronal death, framing CAST as a protective brake on calpain activity.","evidence":"Western blot/IF in AD brain, kainic-acid mouse model with human CAST transgenic overexpression, shRNA knockdown, calpain activity assays","pmids":["19020018"],"confidence":"High","gaps":["In vivo rescue of behavioral or full pathology endpoints not established","Trigger ordering of CAST loss vs calpain activation not fully resolved"]},{"year":2016,"claim":"Resolved how CAST scaffold function is dynamically modulated and how its loss alters release, distinguishing phosphorylation-based gating from structural roles.","evidence":"In vitro SAD-B kinase assay with S45 mutants and electrophysiology; CAST KO mice with patch clamp, IEM, fractionation and Rab6 analysis; KSHV infection model linking CAST to ATG5/autophagy","pmids":["27626661","27422015","27715410"],"confidence":"High","gaps":["Mechanism linking S45 phosphorylation to RRP reloading at molecular level unknown","Direct CAST-Rab6 connection in endosomal recycling not biochemically defined","CAST-to-ATG5 link is correlative without reconstitution"]},{"year":2018,"claim":"Identified Pin1 as a regulator of calpastatin expression and phosphorylation state, linking proline isomerization to the CAST/calpain2 excitotoxicity axis.","evidence":"Co-IP, docking simulation, Pin1 inhibitor (juglone), siRNA knockdown, necrosis assays in rat retinal model with ERG","pmids":["29403356"],"confidence":"Medium","gaps":["Direct Pin1 isomerization site on CAST not mapped","Co-IP without reciprocal structural validation","Causal chain inferred pharmacologically"]},{"year":2019,"claim":"Demonstrated that loss-of-function CAST mutation causes a Mendelian skin disorder, establishing calpastatin's calpain-inhibitory activity as physiologically essential in epidermis.","evidence":"Whole exome sequencing, Sanger confirmation, qRT-PCR, immunoblot, and in vitro calpastatin activity assay in patient fibroblasts","pmids":["31392520"],"confidence":"Medium","gaps":["Tissue-specific basis for skin phenotype not mechanistically explained","Single-family ascertainment limits genotype-phenotype breadth"]},{"year":2020,"claim":"Dissected the developmental scaffold role of CAST/ELKS at the calyx of Held, showing they promote terminal growth and restrain active zone size and CaV2 channel levels without being required for transmission per se.","evidence":"CAST KO + ELKS conditional KO mice, confocal morphometry, EM of active-zone ultrastructure, patch clamp for CaV2 currents and transmission","pmids":["32304329"],"confidence":"High","gaps":["Compensatory mechanism preserving transmission unidentified","Direct molecular link between CAST and CaV2 channel recruitment unknown"]},{"year":null,"claim":"Whether the presynaptic scaffold, calpastatin, the Pol I subunit, and the TCR-associated transducer represent distinct gene products or shared usage of one symbol is not reconciled within this corpus.","evidence":"","pmids":[],"confidence":"Low","gaps":["No single study links the scaffold and calpain-inhibitor functions to the same locus","Cross-tissue identity of CAST usages not experimentally bridged"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,1,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,13]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,2]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,3]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[1,10,11,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5,12]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8]}],"complexes":["Cytomatrix at the active zone (CAZ) complex","RNA polymerase I"],"partners":["RIM1","BASSOON","MUNC13-1","PICCOLO","ELKS","LNX","UBF","PIN1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O15446","full_name":"DNA-directed RNA polymerase I subunit RPA34","aliases":["A34.5","Antisense to ERCC-1 protein","ASE-1","CD3-epsilon-associated protein","CD3E-associated protein","DNA-directed RNA polymerase I subunit G","RNA polymerase I-associated factor PAF49"],"length_aa":510,"mass_kda":55.0,"function":"Component of RNA polymerase I (Pol I), a DNA-dependent RNA polymerase which synthesizes ribosomal RNA precursors using the four ribonucleoside triphosphates as substrates. Involved in UBTF-activated transcription, presumably at a step following PIC formation Has been described as a component of preformed T-cell receptor (TCR) complex","subcellular_location":"Nucleus, nucleolus; Chromosome","url":"https://www.uniprot.org/uniprotkb/O15446/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},{"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},{"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},{"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":183,"is_preprint":false},{"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":173,"is_preprint":false},{"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":161,"is_preprint":false},{"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":159,"is_preprint":false},{"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},{"pmid":"12660339","id":"PMC_12660339","title":"Delayed graft function and cast nephropathy associated with tacrolimus plus rapamycin use.","date":"2003","source":"Journal of the American Society of Nephrology : JASN","url":"https://pubmed.ncbi.nlm.nih.gov/12660339","citation_count":121,"is_preprint":false},{"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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Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40398389","citation_count":8,"is_preprint":false},{"pmid":"39186261","id":"PMC_39186261","title":"Gene‒Environment Interaction Between CAST Gene and Eye-Rubbing in the Chinese Keratoconus Cohort Study: A Case-Only Study.","date":"2024","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/39186261","citation_count":8,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47012,"output_tokens":4866,"usd":0.107013,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12686,"output_tokens":3943,"usd":0.081003,"stage2_stop_reason":"end_turn"},"total_usd":0.188016,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify papers about the canonical CAST protein (calpastatin, the endogenous calpain inhibitor) and the synaptic active zone protein CAST (CAZ-associated structural protein). Both are products of the same CAST gene locus. I'll also check for the CD3ε-binding protein CAST and RNA Pol I subunit CAST/hPAF49, which appear to be the same gene (CAST/ASE-1).\n\nLet me classify and extract mechanistic findings:\n\n- Papers [2], [7], [18], [21], [24], [36], [47], [66], [69], [74], [77], [81], [83]: synaptic CAST (CAZ protein)\n- Papers [13], [29], [41], [44], [52], [94]: calpastatin CAST\n- Paper [31]: CD3ε-binding CAST (same gene per [40])\n- Paper [40]: RNA Pol I subunit CAST/hPAF49\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"CAST (CAZ-associated structural protein) is a ~120 kDa presynaptic cytomatrix protein that directly binds RIM1 and indirectly binds Munc13-1 through RIM1, forming a ternary complex; Bassoon also associates with this complex. CAST localizes at the cytomatrix at the active zone (CAZ) of conventional synapses in mouse brain and is partly co-transported with Bassoon and RIM1 on the same vesicles during synapse formation.\",\n      \"method\": \"Biochemical purification from rat brain, co-immunoprecipitation, direct binding assays, immunofluorescence, immunoelectron microscopy, immunoisolation of transport vesicles\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and direct binding assays with multiple orthogonal methods (co-IP, pulldown, immunoelectron microscopy, vesicle immunoisolation) in a focused mechanistic study\",\n      \"pmids\": [\"12163476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CAST forms a large molecular complex in brain with RIM1, Munc13-1, Bassoon, and Piccolo. RIM1 binds directly to the C-terminus of CAST and Bassoon binds to the central region of CAST, forming a ternary complex; Piccolo also binds the Bassoon-binding region of CAST. Microinjection of the RIM1-binding or Bassoon-binding regions of CAST into cultured superior cervical ganglion neurons impairs synaptic transmission, demonstrating that CAST-RIM1 and CAST-Bassoon interactions are required for neurotransmitter release.\",\n      \"method\": \"Co-immunoprecipitation from brain lysates, direct binding assays with recombinant proteins, domain-mapping, microinjection of peptide fragments into cultured neurons with electrophysiological readout\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding domain mapping combined with functional loss-of-function (microinjection) and electrophysiology, multiple orthogonal methods\",\n      \"pmids\": [\"14734538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CAST2 (rat orthologue of human ELKS/Rab6IP2/ERC1) is a structural paralogue of CAST1 that directly binds RIM1 and forms a hetero-oligomer with CAST1; CAST2 localizes to the presynaptic active zone vicinity in mouse brain and co-localizes with Bassoon at hippocampal synapses.\",\n      \"method\": \"Subcellular fractionation, co-immunoprecipitation, direct binding assays, immunofluorescence, immunoelectron microscopy in primary neurons and mouse brain\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus direct binding assays and immunoelectron microscopy, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"14723704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CAST and ELKS are components of both conventional and ribbon synapses in mouse retina, localizing at the base of synaptic ribbons presynaptically (CAST) or around ribbons (ELKS), as well as at the presynaptic membrane of GABAergic and glycinergic conventional synapses; both co-localize with Bassoon and RIM.\",\n      \"method\": \"Immunofluorescence, immunoelectron microscopy in mouse retina\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunoelectron microscopy provides direct subcellular localization at high resolution, single lab with two orthogonal imaging methods\",\n      \"pmids\": [\"16485285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CAST directly associates with Ligand-of-Numb Protein X (LNX) both in vivo and in vitro; the interaction requires the C-terminus of CAST and the second PDZ domain of LNX. Exogenously expressed LNX partially co-localizes with endogenous CAST at axonal varicosities of hippocampal neurons.\",\n      \"method\": \"Yeast two-hybrid screening, in vivo co-immunoprecipitation, in vitro binding assay, co-localization in heterologous expression system and primary hippocampal neurons\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by in vivo and in vitro binding assays with domain mapping, single lab\",\n      \"pmids\": [\"17257582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Calpastatin (CAST) is markedly depleted from Alzheimer's disease (AD) neurons via cleavage by caspase-1, caspase-3, and calpains. Initial CAST depletion along dendrites coincides with calpain II and ERK1/2 activation, tau cleavage by caspase-3, and tau/neurofilament hyperphosphorylation. In mice, CAST depletion after intrahippocampal kainic acid causes cytoskeletal proteolysis and neuronal death that are substantially reduced in mice overexpressing human CAST. shRNA-mediated CAST reduction in neuronal cells causes calpain-mediated death at sublethal calcium injury levels.\",\n      \"method\": \"Western blot and immunofluorescence in AD brain tissue, mouse kainic acid model with CAST transgenic overexpression, shRNA knockdown in neuronal cell lines, calpain activity assays\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function (shRNA), gain-of-function (transgenic overexpression), and in vivo model with multiple molecular readouts across multiple orthogonal methods\",\n      \"pmids\": [\"19020018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Five active zone proteins converge on an interaction node centered on the N-terminal region of Munc13-1: the zinc-finger domain of RIM1, the C-terminal region of Bassoon, a segment of CAST1/ELKS2, and the third coiled-coil domain (CC3) of Aczonin/Piccolo or Bassoon all interact with Munc13-1's N-terminal region. Recombinant Aczonin-CC3 expressed in neurons targets to synapses and suppresses vesicle turnover.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, recombinant protein binding assays, domain mapping, expression of GFP-fusion in cultured neurons with functional assay\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays with domain mapping and functional neuronal assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"19812333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CAST (CD3epsilon-associated signal transducer, later identified as RNA Pol I subunit) specifically interacts in vivo and in vitro with CD3epsilon (but not CD3zeta or FcRgamma) via a unique membrane-proximal region of CD3epsilon. CAST undergoes tyrosine phosphorylation upon TCR stimulation. Dominant-negative CAST constructs (minimum CD3epsilon-binding domain or tyrosine mutant) suppress NFAT activation and IL-2 production, placing CAST as a component of the preformed TCR complex that transduces activation signals via the CD3epsilon module.\",\n      \"method\": \"Co-immunoprecipitation in vivo and in vitro binding assay, tyrosine phosphorylation assay, overexpression of dominant-negative constructs with NFAT luciferase reporter and IL-2 ELISA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro binding with domain specificity, functional dominant-negative with two readouts, single lab\",\n      \"pmids\": [\"10373416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CAST/hPAF49 is a human RNA polymerase I (Pol I)-specific subunit that undergoes growth-regulated tyrosine phosphorylation specifically in initiation-competent Pol Ibeta complexes. CAST/hPAF49 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 (but not basal) Pol I transcription and disrupt UBF–CAST/hPAF49 interaction, indicating that this Pol I-specific subunit interaction with UBF is required for transcriptional activation.\",\n      \"method\": \"Immunoprecipitation of Pol I complexes, tyrosine phosphorylation assay, in vitro transcription with antibody inhibition and recombinant protein competition, promoter binding assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro transcription reconstitution, co-IP of endogenous complex, phosphorylation analysis, and functional inhibition assays, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"16809778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Kaposi sarcoma-associated herpesvirus (KSHV) reduces CAST (calpastatin) expression in THP-1 monocytoid cells and primary monocytes, and this reduction of CAST consequently decreases ATG5 expression and inhibits autophagy, thereby impairing monocyte differentiation into dendritic cells. This places CAST upstream of ATG5 in the autophagy pathway exploited by KSHV for immune evasion.\",\n      \"method\": \"Western blot for CAST and ATG5 protein levels in KSHV-infected cells, autophagy flux assays, monocyte differentiation assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab with multiple biochemical readouts establishing pathway order (CAST→ATG5→autophagy), but no reconstitution or direct mutagenesis\",\n      \"pmids\": [\"27715410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SAD-B kinase phosphorylates the N-terminal serine 45 (S45) of CAST at the presynaptic active zone; phosphorylation of S45 increases with higher firing rates. A phosphomimetic CAST (S45D) mimics CAST deletion by enhancing short-term synaptic depression (STD) through delayed reloading of the readily releasable pool (RRP). A phosphonegative CAST (S45A) inhibits STD and accelerates RRP reloading. Thus, SAD-B/CAST-S45 phosphorylation acts as a molecular brake on synaptic transmission by controlling RRP size.\",\n      \"method\": \"In vitro kinase assay (SAD-B phosphorylating CAST S45), phosphomimetic and phosphonegative CAST mutant expression in neurons, electrophysiology (patch clamp) for RRP and STD measurements, firing-rate-dependent phosphorylation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis (phosphomimetic/phosphonegative) combined with electrophysiology, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"27626661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CAST knockout mice show increased miniature excitatory postsynaptic response (mEPSC) amplitude in CA1 hippocampus and larger synaptic depression after prolonged activation. The enlarged quantal size is attributable to selective impairment of synaptic vesicle trafficking via the endosome (likely mediated by Rab6) in presynaptic terminals, indicating that CAST regulates both quantal size and endosomal vesicle recycling.\",\n      \"method\": \"CAST knockout mouse, whole-cell patch clamp in hippocampal slices (mEPSC and synaptic depression recordings), immunoelectron microscopy, subcellular fractionation, Rab6 pathway analysis\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined electrophysiological phenotype plus ultrastructural and pathway analysis, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"27422015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Pin1 (peptidyl-prolyl isomerase) binds CAST (calpastatin) as shown by co-IP and computer simulation; Pin1 regulates CAST expression and phosphorylation state. Inhibition of Pin1 with juglone reduces glutamate-induced calpain2 activation and neuronal necrosis in retinal neurons via the CAST/calpain2 pathway. siRNA knockdown confirmed the Pin1-CAST/calpain2 signaling pathway in glutamate excitotoxicity in vivo.\",\n      \"method\": \"Co-immunoprecipitation, computer docking simulation, Western blot with Pin1 inhibitor (juglone), siRNA knockdown, PI staining and LDH assay for necrosis, flow cytometry, in vivo rat retinal model, flash ERG\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus siRNA functional validation in vitro and in vivo, single lab, multiple methods but no reconstitution\",\n      \"pmids\": [\"29403356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A homozygous nonsense mutation (c.544G>T, p.Glu182*) in CAST (calpastatin) causes PLACK syndrome (peeling skin, leukonychia, acral punctate keratoses, cheilitis and knuckle pads). Real-time qRT-PCR and immunoblot showed reduced calpastatin expression in skin fibroblasts from affected individuals. In vitro calpastatin activity assays confirmed decreased inhibitory activity, establishing that loss of calpastatin function underlies this skin disorder.\",\n      \"method\": \"Whole exome sequencing, Sanger confirmation, qRT-PCR, immunoblot, in vitro calpastatin activity assay in patient fibroblasts\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzymatic activity assay in patient-derived cells plus molecular confirmation of protein loss, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"31392520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Combined deletion of CAST and ELKS at the calyx of Held results in reduced presynaptic terminal surface area and volume, increased active zone size, and reduction of all CaV2 channel subtype currents correlating with fewer presynaptic CaV2 channel numbers. These morphological and channel-level changes do not impair synaptic transmission or plasticity, indicating that CAST/ELKS are positive regulators of presynaptic growth and suppressors of active zone expansion and CaV2 channel levels during development, with developmental compensation preserving transmission.\",\n      \"method\": \"CAST knockout and ELKS conditional knockout mice, confocal morphological analysis, electron microscopy of active zone ultrastructure, patch clamp electrophysiology for CaV2 currents and synaptic transmission at calyx of Held\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — double KO with defined morphological and electrophysiological phenotypes at a well-characterized synapse, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"32304329\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CAST encodes calpastatin, the endogenous inhibitor of calpain proteases, whose depletion by caspases and calpains themselves drives calpain dysregulation in neurodegeneration and skin disease (PLACK syndrome); the same gene locus also produces a presynaptic active zone scaffold protein (CAZ-CAST) that directly binds RIM1 (C-terminus) and Bassoon (central region), indirectly recruits Munc13-1 and Piccolo into a large multi-protein complex, regulates neurotransmitter release, controls presynaptic CaV2 channel levels and active zone morphology during development, and undergoes SAD-B-mediated phosphorylation at S45 to modulate readily releasable pool reloading and short-term synaptic depression; additionally, the CAST/hPAF49 protein is a Pol I-specific subunit whose UBF interaction is required for activated rDNA transcription.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"The CAST symbol resolves in this corpus to multiple distinct proteins that share the acronym. The dominant entity is CAST/ERC1-family CAZ-associated structural protein, a ~120 kDa scaffold of the presynaptic cytomatrix at the active zone that organizes the neurotransmitter-release machinery [#0]. CAST directly binds the C-terminus of RIM1 and the central region of Bassoon, and through these contacts assembles a large complex that also incorporates Munc13-1 and Piccolo; microinjection of the RIM1- or Bassoon-binding fragments disrupts these interactions and impairs neurotransmitter release, establishing the scaffold as functionally required for transmission [#1, #6]. It heterodimerizes with the paralog CAST2/ELKS and localizes to both conventional and ribbon synapses [#2, #3]. Functionally, CAST regulates quantal size and endosomal synaptic-vesicle recycling, with knockout enlarging mEPSC amplitude and deepening synaptic depression [#11], and CAST/ELKS together act as positive regulators of presynaptic growth that restrain active zone size and set presynaptic CaV2 channel levels during development [#14]. SAD-B kinase phosphorylates CAST at S45 in a firing-rate-dependent manner, and this modification serves as a brake on transmission by slowing readily-releasable-pool reloading [#10]. Distinct from this scaffold, the same symbol denotes calpastatin, the endogenous calpain inhibitor whose caspase- and calpain-mediated depletion drives cytoskeletal proteolysis and neuronal death in Alzheimer's disease and excitotoxic models [#5, #12]; a homozygous nonsense mutation (p.Glu182*) in calpastatin causes PLACK syndrome through loss of calpain-inhibitory activity [#13]. A third usage, CAST/hPAF49, identifies a human RNA polymerase I-specific subunit whose UBF interaction is required for activated rDNA transcription [#8], and an early report assigned CAST to a CD3epsilon-associated TCR signaling role [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established a CAST entity as a CD3epsilon-associated signal transducer within the preformed TCR complex, raising the question of how the membrane-proximal CD3epsilon module couples to downstream activation.\",\n      \"evidence\": \"Co-IP and in vitro binding with CD3epsilon, tyrosine-phosphorylation assay, dominant-negative constructs with NFAT reporter and IL-2 ELISA in T cells\",\n      \"pmids\": [\"10373416\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"This usage of CAST is not reconciled with the later scaffold and Pol I subunit identities\", \"Direct enzymatic or adaptor activity in TCR signaling not defined\", \"No structural data on the CD3epsilon interaction\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified CAST as a presynaptic active-zone scaffold that directly binds RIM1 and bridges to Munc13-1 and Bassoon, answering how active-zone components are physically organized.\",\n      \"evidence\": \"Biochemical purification from rat brain, co-IP, direct binding assays, immunoelectron microscopy, transport-vesicle immunoisolation\",\n      \"pmids\": [\"12163476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional requirement for transmission not yet shown\", \"Stoichiometry and higher-order assembly undefined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapped the binding domains within the CAST complex and showed the interactions are functionally required for release, moving from architecture to causal mechanism.\",\n      \"evidence\": \"Co-IP, domain mapping, microinjection of CAST fragments into SCG neurons with electrophysiology; subcellular fractionation and IEM for the CAST2/ELKS paralog\",\n      \"pmids\": [\"14734538\", \"14723704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of each interaction to release kinetics unresolved\", \"Hetero-oligomer stoichiometry of CAST1/CAST2 unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended CAST localization to ribbon and conventional synapses and resolved the convergence of five active-zone proteins on the Munc13-1 N-terminal node, clarifying the topology of the release scaffold.\",\n      \"evidence\": \"IEM in mouse retina; yeast two-hybrid, co-IP, domain mapping and neuronal functional assay for the Munc13-1 interaction node\",\n      \"pmids\": [\"16485285\", \"19812333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial assembly order at the active zone not directly visualized\", \"Whether all five contacts are simultaneous or mutually exclusive unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined a CAST/hPAF49 entity as a Pol I-specific subunit whose UBF interaction is required for activated rDNA transcription, addressing how growth signals are relayed to ribosomal RNA synthesis.\",\n      \"evidence\": \"IP of Pol I complexes, tyrosine-phosphorylation analysis, in vitro transcription with antibody inhibition and recombinant competition, promoter binding\",\n      \"pmids\": [\"16809778\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship of this subunit to the presynaptic CAST scaffold not addressed\", \"Kinase responsible for growth-regulated phosphorylation unidentified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed that calpastatin (CAST) is depleted by caspases and calpains in Alzheimer's disease and that its loss drives calpain-mediated cytoskeletal proteolysis and neuronal death, framing CAST as a protective brake on calpain activity.\",\n      \"evidence\": \"Western blot/IF in AD brain, kainic-acid mouse model with human CAST transgenic overexpression, shRNA knockdown, calpain activity assays\",\n      \"pmids\": [\"19020018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo rescue of behavioral or full pathology endpoints not established\", \"Trigger ordering of CAST loss vs calpain activation not fully resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved how CAST scaffold function is dynamically modulated and how its loss alters release, distinguishing phosphorylation-based gating from structural roles.\",\n      \"evidence\": \"In vitro SAD-B kinase assay with S45 mutants and electrophysiology; CAST KO mice with patch clamp, IEM, fractionation and Rab6 analysis; KSHV infection model linking CAST to ATG5/autophagy\",\n      \"pmids\": [\"27626661\", \"27422015\", \"27715410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking S45 phosphorylation to RRP reloading at molecular level unknown\", \"Direct CAST-Rab6 connection in endosomal recycling not biochemically defined\", \"CAST-to-ATG5 link is correlative without reconstitution\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified Pin1 as a regulator of calpastatin expression and phosphorylation state, linking proline isomerization to the CAST/calpain2 excitotoxicity axis.\",\n      \"evidence\": \"Co-IP, docking simulation, Pin1 inhibitor (juglone), siRNA knockdown, necrosis assays in rat retinal model with ERG\",\n      \"pmids\": [\"29403356\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct Pin1 isomerization site on CAST not mapped\", \"Co-IP without reciprocal structural validation\", \"Causal chain inferred pharmacologically\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that loss-of-function CAST mutation causes a Mendelian skin disorder, establishing calpastatin's calpain-inhibitory activity as physiologically essential in epidermis.\",\n      \"evidence\": \"Whole exome sequencing, Sanger confirmation, qRT-PCR, immunoblot, and in vitro calpastatin activity assay in patient fibroblasts\",\n      \"pmids\": [\"31392520\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tissue-specific basis for skin phenotype not mechanistically explained\", \"Single-family ascertainment limits genotype-phenotype breadth\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Dissected the developmental scaffold role of CAST/ELKS at the calyx of Held, showing they promote terminal growth and restrain active zone size and CaV2 channel levels without being required for transmission per se.\",\n      \"evidence\": \"CAST KO + ELKS conditional KO mice, confocal morphometry, EM of active-zone ultrastructure, patch clamp for CaV2 currents and transmission\",\n      \"pmids\": [\"32304329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Compensatory mechanism preserving transmission unidentified\", \"Direct molecular link between CAST and CaV2 channel recruitment unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether the presynaptic scaffold, calpastatin, the Pol I subunit, and the TCR-associated transducer represent distinct gene products or shared usage of one symbol is not reconciled within this corpus.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No single study links the scaffold and calpain-inhibitor functions to the same locus\", \"Cross-tissue identity of CAST usages not experimentally bridged\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 13]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [1, 10, 11, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5, 12]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\n      \"Cytomatrix at the active zone (CAZ) complex\",\n      \"RNA polymerase I\"\n    ],\n    \"partners\": [\n      \"RIM1\",\n      \"Bassoon\",\n      \"Munc13-1\",\n      \"Piccolo\",\n      \"ELKS\",\n      \"LNX\",\n      \"UBF\",\n      \"Pin1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}