{"gene":"CALM1","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2016,"finding":"The novel CALM1 variant E141G causes an 11-fold reduction in Ca²⁺-binding affinity and a functionally dominant loss of inactivation (CDI) in the cardiac L-type calcium channel CaV1.2, with mild accentuation of NaV1.5 late current, but no effect on intracellular RyR2-mediated calcium release.","method":"Functional characterization including Ca²⁺-binding affinity assay, patch-clamp electrophysiology of CaV1.2 and NaV1.5, and intracellular calcium release assay in heterologous expression systems","journal":"Circulation. Cardiovascular genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal functional assays (Ca²⁺ binding, CaV1.2 CDI, NaV1.5 late current, RyR2 calcium release) in a single rigorous study","pmids":["26969752"],"is_preprint":false},{"year":2017,"finding":"The CALM1-F142L mutation severely impairs Ca²⁺-dependent inactivation (CDI) of ICaL (L-type calcium current), resulting in augmented inward current during the plateau phase and prolonged repolarization with altered rate-dependency; the mutation did not significantly affect IKs, INaL, If, or intracellular Ca²⁺ dynamics/store stability. Repolarization abnormalities were reversed by verapamil (ICaL blockade).","method":"Patch-clamp electrophysiology and intracellular Ca²⁺ measurements in patient-derived hiPSC-CMs with dynamic clamp correction; pharmacological rescue with verapamil","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — patient-specific hiPSC-CM model with multiple orthogonal electrophysiological readouts, pharmacological rescue, and computational modeling confirming CDI impairment as the primary mechanism","pmids":["28158429"],"is_preprint":false},{"year":2020,"finding":"The Calm1-N98S knock-in mutation causes β-adrenergically induced ICa.L dysregulation: β-adrenergic stimulation increased peak ICa.L density, slowed inactivation, and left-shifted the activation curve significantly more in Calm1N98S/+ versus wild-type ventricular myocytes, increasing late ICa.L. Rapidly paced mutant myocytes showed increased propensity for delayed afterdepolarization-induced triggered activity, and His-Purkinje fibers exhibited increased susceptibility for pause-dependent early afterdepolarizations. Both reentry and focal mechanisms contribute to arrhythmogenesis.","method":"CRISPR/Cas9 knock-in mouse model; patch-clamp electrophysiology; optical voltage mapping; fluorescence Ca²⁺ imaging; microelectrode technique for His-Purkinje fibers; pharmacological β-adrenergic blockade/activation","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vivo knock-in model with multiple orthogonal electrophysiological methods, two independent mouse lines, and pharmacological validation","pmids":["32929985"],"is_preprint":false},{"year":2014,"finding":"RNAi-mediated knockdown of Calm1 (but not Calm2 or Calm3) in mice caused defective precerebellar neuron (PCN) migration: PCNs failed to complete circumferential tangential migration and failed to invade the hindbrain via radial migration, establishing a specific non-redundant role for Calm1 in both tangential and radial neuronal migration.","method":"RNAi-mediated acute knockdown of individual Calm genes in vivo; histological analysis of PCN migration in developing mouse hindbrain","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific gene knockdown with clear phenotypic readout and gene-specificity demonstrated by negative results for Calm2/3 paralogs, single lab","pmids":["25519244"],"is_preprint":false},{"year":2005,"finding":"The CALM1 core promoter SNP −16C>T reduces CALM1 transcription in vitro and in vivo; inhibition of CaM in chondrogenic cells reduced expression of major cartilage matrix genes Col2a1 and Agc1, placing CALM1-mediated signaling in the pathway of chondrogenic activity.","method":"Functional promoter analysis (luciferase reporter assay in vitro and in vivo); pharmacological CaM inhibition in chondrogenic cells with gene expression readout","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional promoter assay plus pharmacological inhibition with downstream gene expression readout, single lab","pmids":["15746150"],"is_preprint":false},{"year":2015,"finding":"FMRP associates with miR-181d, Map1b mRNA, and Calm1 mRNA, and mediates axonal delivery of miR-181d, which locally targets Calm1 (and Map1b) transcripts to negatively regulate axon elongation. NGF induces release of Calm1 mRNA from FMRP/miR-181d-repressing granules, promoting axon elongation. FMRP deficiency impeded axonal delivery of miR-181d and Calm1, reducing calmodulin protein levels in axons.","method":"Co-immunoprecipitation (FMRP with miR-181d/Calm1 mRNA); knockdown of Fmr1 and miR-181d overexpression; local protein synthesis assay in axons; NGF stimulation experiments in primary sensory neurons","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP of FMRP with Calm1 mRNA, multiple genetic perturbations, and local translation readout, single lab","pmids":["26711345"],"is_preprint":false},{"year":2020,"finding":"The Calm1 long 3'-UTR mRNA isoform (Calm1-L), generated by alternative polyadenylation and largely restricted to neural tissues, is required for proper dorsal root ganglion (DRG) neuron migration in embryos and for experience-induced neuronal activation in the adult hippocampus. CRISPR-Cas9 deletion of the distal poly(A) site eliminated Calm1-L while maintaining Calm1-S. Both isoforms are subcellularly localized to neural processes of hippocampal neurons; Calm1-L is restricted to soma in DRG.","method":"CRISPR-Cas9 deletion of Calm1 distal poly(A) site; smFISH subcellular localization; in vivo phenotypic analysis of DRG migration and hippocampal activation in knock-in mice","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic deletion with specific isoform loss and dual in vivo phenotypic readouts, combined with subcellular localization by smFISH, single lab","pmids":["32522888"],"is_preprint":false},{"year":2024,"finding":"A suppression-and-replacement (SupRep) gene therapy using a single construct with CALM1-, CALM2-, and CALM3-targeting shRNAs plus a shRNA-immune CALM1 cDNA shortened pathologically prolonged action potential duration (APD90) in patient-derived iPSC-CMs carrying CALM1-F142L, CALM2-D130G, and CALM3-D130G mutations, providing proof-of-principle for pan-calmodulinopathy gene therapy.","method":"shRNA knockdown efficiency assay in TSA201 cells; voltage-sensing dye APD90 measurement in patient iPSC-derived cardiomyocytes; transfection of SupRep construct","journal":"Circulation. Arrhythmia and electrophysiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue in patient-specific iPSC-CMs with multiple CALM variant lines, single lab","pmids":["39069900"],"is_preprint":false},{"year":2025,"finding":"Erianin targets and binds to CALM1 protein, enhancing its stability and subsequently increasing phosphorylation of CAMKK2, facilitating autophagy in 5-FU-resistant colorectal cancer cells and reversing drug resistance.","method":"Drug-target binding assay; Western blotting for CALM1 stability and CAMKK2 phosphorylation; autophagy marker immunofluorescence; xenograft tumor model","journal":"Chemico-biological interactions","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, abstract does not specify binding assay methodology (e.g., SPR, ITC), limited mechanistic detail on CALM1–CAMKK2 interaction","pmids":["40976489"],"is_preprint":false},{"year":2013,"finding":"The CALM1 p.F90L missense mutation, identified by exome sequencing in a family with idiopathic ventricular fibrillation, affects a residue (F90) previously shown to mediate direct interaction of calmodulin with target peptides, supporting a mechanism whereby disruption of CaM–target interaction underlies arrhythmia.","method":"Exome sequencing; segregation analysis; mechanistic inference from prior structural/biochemical literature on F90-mediated target peptide interaction","journal":"Journal of the American College of Cardiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genetic identification only; mechanistic claim about F90 and target peptide interaction is cited from prior literature, not re-demonstrated experimentally in this paper","pmids":["24076290"],"is_preprint":false},{"year":1998,"finding":"CALM3 is at least 5-fold more actively transcribed than CALM1 or CALM2 in proliferating human teratoma cells; the 5' untranslated regions of each CALM gene are necessary to recover full promoter activation in transient transfection assays, indicating differential transcriptional regulation among the three CALM genes.","method":"Quantitative mRNA abundance measurement; nuclear run-on transcription assay; luciferase reporter transfection with and without 5' UTR","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal assays (run-on, mRNA quantification, reporter) in a single study establishing differential transcriptional activity and 5' UTR requirement","pmids":["9681195"],"is_preprint":false}],"current_model":"CALM1 encodes calmodulin, a Ca²⁺ sensor protein whose pathogenic missense variants (e.g., F142L, N98S, E141G) impair Ca²⁺-dependent inactivation (CDI) of the cardiac L-type calcium channel CaV1.2, leading to prolonged action potential duration and ventricular arrhythmias; additionally, CALM1 participates in neuronal migration and axon elongation through a CaM-dependent pathway, and its long 3'-UTR isoform has isoform-specific roles in neural development, while the three CALM genes exhibit differential transcriptional activity with CALM1's 5' UTR being required for full promoter activation."},"narrative":{"mechanistic_narrative":"CALM1 encodes calmodulin, a Ca²⁺ sensor that governs Ca²⁺-dependent inactivation (CDI) of the cardiac L-type calcium channel CaV1.2, and pathogenic missense variants in this protein cause inherited ventricular arrhythmia syndromes (calmodulinopathies) [PMID:26969752, PMID:28158429]. Disease variants act through distinct but converging defects: E141G reduces Ca²⁺-binding affinity ~11-fold and produces a dominant loss of CaV1.2 CDI with mild accentuation of NaV1.5 late current but no effect on RyR2-mediated Ca²⁺ release [PMID:26969752]; F142L severely impairs CDI of ICaL, augmenting plateau-phase inward current and prolonging repolarization in a manner reversed by the ICaL blocker verapamil [PMID:28158429]; and N98S confers β-adrenergically induced ICaL dysregulation that promotes delayed and early afterdepolarization-driven triggered activity [PMID:32929985]. Because the three CALM genes are functionally interchangeable at the protein level, suppression of all three calmodulin transcripts combined with replacement of a shRNA-immune CALM1 cDNA shortens pathologically prolonged action potential duration across CALM1, CALM2, and CALM3 variant cardiomyocytes, establishing a pan-calmodulinopathy therapeutic strategy [PMID:39069900]. Beyond the heart, CALM1 has a non-redundant role in neuronal migration: knockdown of Calm1 (but not its paralogs) disrupts both tangential and radial precerebellar neuron migration [PMID:25519244], and its long 3'-UTR isoform, generated by alternative polyadenylation in neural tissue, is required for dorsal root ganglion neuron migration and experience-induced hippocampal activation [PMID:32522888]. Calmodulin protein output in axons is itself regulated post-transcriptionally, with FMRP and miR-181d repressing Calm1 mRNA in axonal granules until NGF triggers its release to support local translation and axon elongation [PMID:26711345]. CALM1 transcription is controlled by its core promoter and 5' UTR, and CaM-dependent signaling supports expression of cartilage matrix genes Col2a1 and Agc1 in chondrocytes [PMID:15746150, PMID:9681195].","teleology":[{"year":1998,"claim":"Established that the three calmodulin-encoding genes are not transcriptionally equivalent, raising the question of gene-specific regulation despite identical protein products.","evidence":"Nuclear run-on, mRNA quantification, and 5' UTR luciferase reporter assays in human teratoma cells","pmids":["9681195"],"confidence":"Medium","gaps":["Does not identify the trans-factors driving differential CALM gene transcription","Performed in a single proliferating cell type"]},{"year":2005,"claim":"Connected CALM1 promoter activity and CaM signaling to a downstream biological output, placing calmodulin upstream of cartilage matrix gene expression.","evidence":"Promoter SNP luciferase reporter assays plus pharmacological CaM inhibition with Col2a1/Agc1 readout in chondrogenic cells","pmids":["15746150"],"confidence":"Medium","gaps":["Pharmacological CaM inhibition is not CALM1-specific","Direct transcriptional targets of CaM signaling not defined"]},{"year":2013,"claim":"Linked CALM1 genetically to inherited ventricular fibrillation, implicating disruption of CaM–target peptide interaction as an arrhythmia mechanism.","evidence":"Exome sequencing and segregation analysis in a family with idiopathic VF; mechanistic inference from prior structural literature on residue F90","pmids":["24076290"],"confidence":"Low","gaps":["F90 mechanistic role cited from prior literature, not re-demonstrated experimentally here","No functional channel assay for the F90L variant"]},{"year":2014,"claim":"Demonstrated a non-redundant neurodevelopmental role for Calm1 distinct from its paralogs, answering whether the three calmodulin genes are functionally interchangeable in vivo.","evidence":"RNAi knockdown of individual Calm genes in mouse hindbrain with histological analysis of precerebellar neuron migration","pmids":["25519244"],"confidence":"Medium","gaps":["Molecular effectors downstream of Calm1 in migrating neurons unknown","Single lab, acute knockdown only"]},{"year":2015,"claim":"Revealed post-transcriptional control of axonal calmodulin levels, showing how Calm1 mRNA is spatially restrained and de-repressed to regulate axon growth.","evidence":"Co-IP of FMRP with Calm1 mRNA/miR-181d, genetic perturbations, and local translation assays in primary sensory neurons with NGF stimulation","pmids":["26711345"],"confidence":"Medium","gaps":["Single Co-IP system; direct miR-181d binding site on Calm1 not mapped functionally","Whether this pathway operates in non-sensory neurons unknown"]},{"year":2016,"claim":"Defined the biophysical mechanism of a calmodulinopathy variant, showing reduced Ca²⁺ affinity translates to dominant loss of CaV1.2 inactivation rather than RyR2 dysfunction.","evidence":"Ca²⁺-binding affinity assay, patch-clamp of CaV1.2 and NaV1.5, and intracellular Ca²⁺ release assay in heterologous systems for E141G","pmids":["26969752"],"confidence":"High","gaps":["Heterologous expression may not capture native cardiomyocyte channel context","Contribution of NaV1.5 late current to phenotype not quantified"]},{"year":2017,"claim":"Confirmed CDI impairment as the primary arrhythmic mechanism in a patient-relevant model and showed it is pharmacologically reversible.","evidence":"Patch-clamp and Ca²⁺ measurements in patient-derived hiPSC-CMs with dynamic clamp and verapamil rescue for F142L","pmids":["28158429"],"confidence":"High","gaps":["Verapamil rescue is mechanistic proof-of-concept, not a clinical therapy","Variant-specific differences across calmodulinopathy mutations not addressed"]},{"year":2020,"claim":"Established an in vivo arrhythmia mechanism for the N98S variant, showing β-adrenergic stress unmasks ICaL dysregulation that drives triggered activity.","evidence":"CRISPR knock-in mouse, patch-clamp, optical voltage mapping, Ca²⁺ imaging, and His-Purkinje microelectrode recordings with β-adrenergic modulation","pmids":["32929985"],"confidence":"High","gaps":["Mouse cardiac electrophysiology differs from human","Molecular basis of the β-adrenergic sensitivity not fully resolved"]},{"year":2020,"claim":"Identified an isoform-specific neural function for the long 3'-UTR Calm1 mRNA, separating coding-independent regulatory roles from protein function.","evidence":"CRISPR deletion of the distal poly(A) site, smFISH localization, and in vivo DRG migration and hippocampal activation phenotyping in knock-in mice","pmids":["32522888"],"confidence":"Medium","gaps":["Trans-factors binding the long 3'-UTR not identified","Mechanism linking isoform to phenotypes undefined"]},{"year":2024,"claim":"Provided proof-of-principle that a single suppression-and-replacement construct can correct the action potential phenotype across all three calmodulin genes, exploiting their protein-level redundancy therapeutically.","evidence":"shRNA knockdown plus shRNA-immune CALM1 cDNA replacement with APD90 measurement in patient iPSC-CMs carrying CALM1/CALM2/CALM3 variants","pmids":["39069900"],"confidence":"Medium","gaps":["In vitro iPSC-CM model only; no in vivo delivery demonstrated","Long-term safety and off-target effects not assessed"]},{"year":2025,"claim":"Implicated CALM1 in a cancer drug-resistance pathway via stabilization and CAMKK2-linked autophagy, extending calmodulin function beyond cardiac and neural contexts.","evidence":"Drug-target binding assay, Western blot for CALM1 stability and CAMKK2 phosphorylation, autophagy markers, and xenograft model in 5-FU-resistant colorectal cancer","pmids":["40976489"],"confidence":"Low","gaps":["Binding assay methodology unspecified (no SPR/ITC)","Direct CALM1–CAMKK2 interaction not mechanistically detailed","Single lab"]},{"year":null,"claim":"How calmodulin's identical protein product is differentially deployed across cardiac, neuronal, and chondrogenic contexts — and which target effectors mediate each role — remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Tissue-specific CaM target effectors largely uncharacterized in this corpus","Structural basis distinguishing variant-specific CDI defects not unified","Regulatory factors governing CALM gene/isoform expression not identified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,6]}],"pathway":[],"complexes":[],"partners":["CACNA1C","SCN5A","FMR1","CAMKK2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P0DP23","full_name":"Calmodulin-1","aliases":[],"length_aa":149,"mass_kda":16.8,"function":"Calmodulin acts as part of a calcium signal transduction pathway by mediating the control of a large number of enzymes, ion channels, aquaporins and other proteins through calcium-binding (PubMed:16760425, PubMed:23893133, PubMed:26969752, PubMed:27165696, PubMed:28890335, PubMed:31454269, PubMed:35568036). Calcium-binding is required for the activation of calmodulin (PubMed:16760425, PubMed:23893133, PubMed:26969752, PubMed:27165696, PubMed:28890335, PubMed:31454269, PubMed:35568036). Among the enzymes to be stimulated by the calmodulin-calcium complex are a number of protein kinases, such as myosin light-chain kinases and calmodulin-dependent protein kinase type II (CaMK2), and phosphatases (PubMed:16760425, PubMed:23893133, PubMed:26969752, PubMed:27165696, PubMed:28890335, PubMed:31454269, PubMed:35568036). Together with CCP110 and centrin, is involved in a genetic pathway that regulates the centrosome cycle and progression through cytokinesis (PubMed:16760425). Is a regulator of voltage-dependent L-type calcium channels (PubMed:31454269). Mediates calcium-dependent inactivation of CACNA1C (PubMed:26969752). Positively regulates calcium-activated potassium channel activity of KCNN2 (PubMed:27165696). Forms a potassium channel complex with KCNQ1 and regulates electrophysiological activity of the channel via calcium-binding (PubMed:25441029). Acts as a sensor to modulate the endoplasmic reticulum contacts with other organelles mediated by VMP1:ATP2A2 (PubMed:28890335) (Microbial infection) Required for Legionella pneumophila SidJ glutamylase activity (Microbial infection) Required for C.violaceum CopC and S.flexneri OspC3 arginine ADP-riboxanase activity","subcellular_location":"Cytoplasm, cytoskeleton, spindle; Cytoplasm, cytoskeleton, spindle pole; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cell projection, cilium, flagellum","url":"https://www.uniprot.org/uniprotkb/P0DP23/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CALM1","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000198668","cell_line_id":"CID000357","localizations":[{"compartment":"cell_contact","grade":3},{"compartment":"centrosome","grade":3},{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":3},{"compartment":"membrane","grade":1}],"interactors":[{"gene":"MYL6","stoichiometry":10.0},{"gene":"CALM2;CALM3;CALM1","stoichiometry":10.0},{"gene":"DENND4C","stoichiometry":0.2},{"gene":"UBR4","stoichiometry":0.2},{"gene":"ANKS6","stoichiometry":0.2},{"gene":"KIF1BBETA;KIF1B","stoichiometry":0.2},{"gene":"ESCO1","stoichiometry":0.2},{"gene":"ASPM","stoichiometry":0.2},{"gene":"PLEKHH2","stoichiometry":0.2},{"gene":"CEP97","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000357","total_profiled":1310},"omim":[{"mim_id":"618807","title":"LIPOPROTEIN(a) QUANTITATIVE TRAIT LOCUS; LPAQTL","url":"https://www.omim.org/entry/618807"},{"mim_id":"618782","title":"LONG QT SYNDROME 16; LQT16","url":"https://www.omim.org/entry/618782"},{"mim_id":"618759","title":"CALCIUM-BINDING PROTEIN 7; CABP7","url":"https://www.omim.org/entry/618759"},{"mim_id":"617631","title":"IQ DOMAIN-CONTAINING PROTEIN E; IQCE","url":"https://www.omim.org/entry/617631"},{"mim_id":"617379","title":"MYOSIN XIX; MYO19","url":"https://www.omim.org/entry/617379"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CALM1"},"hgnc":{"alias_symbol":["CAMI","PHKD","DD132","PHKD1"],"prev_symbol":["CALML2"]},"alphafold":{"accession":"P0DP23","domains":[{"cath_id":"1.10.238.10","chopping":"1-78","consensus_level":"high","plddt":83.4442,"start":1,"end":78},{"cath_id":"1.10.238.10","chopping":"94-146","consensus_level":"high","plddt":91.1268,"start":94,"end":146}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P0DP23","model_url":"https://alphafold.ebi.ac.uk/files/AF-P0DP23-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P0DP23-F1-predicted_aligned_error_v6.png","plddt_mean":85.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CALM1","jax_strain_url":"https://www.jax.org/strain/search?query=CALM1"},"sequence":{"accession":"P0DP23","fasta_url":"https://rest.uniprot.org/uniprotkb/P0DP23.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P0DP23/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P0DP23"}},"corpus_meta":[{"pmid":"24076290","id":"PMC_24076290","title":"A mutation in CALM1 encoding calmodulin in familial idiopathic ventricular fibrillation in childhood and adolescence.","date":"2013","source":"Journal of the American College of Cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/24076290","citation_count":136,"is_preprint":false},{"pmid":"26969752","id":"PMC_26969752","title":"Spectrum and Prevalence of CALM1-, CALM2-, and CALM3-Encoded Calmodulin Variants in Long QT Syndrome and Functional Characterization of a Novel Long QT Syndrome-Associated Calmodulin Missense Variant, E141G.","date":"2016","source":"Circulation. 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Clinical safety of thrombolytic therapy. 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affinity assay, patch-clamp electrophysiology of CaV1.2 and NaV1.5, and intracellular calcium release assay in heterologous expression systems\",\n      \"journal\": \"Circulation. Cardiovascular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal functional assays (Ca²⁺ binding, CaV1.2 CDI, NaV1.5 late current, RyR2 calcium release) in a single rigorous study\",\n      \"pmids\": [\"26969752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The CALM1-F142L mutation severely impairs Ca²⁺-dependent inactivation (CDI) of ICaL (L-type calcium current), resulting in augmented inward current during the plateau phase and prolonged repolarization with altered rate-dependency; the mutation did not significantly affect IKs, INaL, If, or intracellular Ca²⁺ dynamics/store stability. Repolarization abnormalities were reversed by verapamil (ICaL blockade).\",\n      \"method\": \"Patch-clamp electrophysiology and intracellular Ca²⁺ measurements in patient-derived hiPSC-CMs with dynamic clamp correction; pharmacological rescue with verapamil\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — patient-specific hiPSC-CM model with multiple orthogonal electrophysiological readouts, pharmacological rescue, and computational modeling confirming CDI impairment as the primary mechanism\",\n      \"pmids\": [\"28158429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The Calm1-N98S knock-in mutation causes β-adrenergically induced ICa.L dysregulation: β-adrenergic stimulation increased peak ICa.L density, slowed inactivation, and left-shifted the activation curve significantly more in Calm1N98S/+ versus wild-type ventricular myocytes, increasing late ICa.L. Rapidly paced mutant myocytes showed increased propensity for delayed afterdepolarization-induced triggered activity, and His-Purkinje fibers exhibited increased susceptibility for pause-dependent early afterdepolarizations. Both reentry and focal mechanisms contribute to arrhythmogenesis.\",\n      \"method\": \"CRISPR/Cas9 knock-in mouse model; patch-clamp electrophysiology; optical voltage mapping; fluorescence Ca²⁺ imaging; microelectrode technique for His-Purkinje fibers; pharmacological β-adrenergic blockade/activation\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vivo knock-in model with multiple orthogonal electrophysiological methods, two independent mouse lines, and pharmacological validation\",\n      \"pmids\": [\"32929985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RNAi-mediated knockdown of Calm1 (but not Calm2 or Calm3) in mice caused defective precerebellar neuron (PCN) migration: PCNs failed to complete circumferential tangential migration and failed to invade the hindbrain via radial migration, establishing a specific non-redundant role for Calm1 in both tangential and radial neuronal migration.\",\n      \"method\": \"RNAi-mediated acute knockdown of individual Calm genes in vivo; histological analysis of PCN migration in developing mouse hindbrain\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific gene knockdown with clear phenotypic readout and gene-specificity demonstrated by negative results for Calm2/3 paralogs, single lab\",\n      \"pmids\": [\"25519244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The CALM1 core promoter SNP −16C>T reduces CALM1 transcription in vitro and in vivo; inhibition of CaM in chondrogenic cells reduced expression of major cartilage matrix genes Col2a1 and Agc1, placing CALM1-mediated signaling in the pathway of chondrogenic activity.\",\n      \"method\": \"Functional promoter analysis (luciferase reporter assay in vitro and in vivo); pharmacological CaM inhibition in chondrogenic cells with gene expression readout\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional promoter assay plus pharmacological inhibition with downstream gene expression readout, single lab\",\n      \"pmids\": [\"15746150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FMRP associates with miR-181d, Map1b mRNA, and Calm1 mRNA, and mediates axonal delivery of miR-181d, which locally targets Calm1 (and Map1b) transcripts to negatively regulate axon elongation. NGF induces release of Calm1 mRNA from FMRP/miR-181d-repressing granules, promoting axon elongation. FMRP deficiency impeded axonal delivery of miR-181d and Calm1, reducing calmodulin protein levels in axons.\",\n      \"method\": \"Co-immunoprecipitation (FMRP with miR-181d/Calm1 mRNA); knockdown of Fmr1 and miR-181d overexpression; local protein synthesis assay in axons; NGF stimulation experiments in primary sensory neurons\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP of FMRP with Calm1 mRNA, multiple genetic perturbations, and local translation readout, single lab\",\n      \"pmids\": [\"26711345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The Calm1 long 3'-UTR mRNA isoform (Calm1-L), generated by alternative polyadenylation and largely restricted to neural tissues, is required for proper dorsal root ganglion (DRG) neuron migration in embryos and for experience-induced neuronal activation in the adult hippocampus. CRISPR-Cas9 deletion of the distal poly(A) site eliminated Calm1-L while maintaining Calm1-S. Both isoforms are subcellularly localized to neural processes of hippocampal neurons; Calm1-L is restricted to soma in DRG.\",\n      \"method\": \"CRISPR-Cas9 deletion of Calm1 distal poly(A) site; smFISH subcellular localization; in vivo phenotypic analysis of DRG migration and hippocampal activation in knock-in mice\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic deletion with specific isoform loss and dual in vivo phenotypic readouts, combined with subcellular localization by smFISH, single lab\",\n      \"pmids\": [\"32522888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A suppression-and-replacement (SupRep) gene therapy using a single construct with CALM1-, CALM2-, and CALM3-targeting shRNAs plus a shRNA-immune CALM1 cDNA shortened pathologically prolonged action potential duration (APD90) in patient-derived iPSC-CMs carrying CALM1-F142L, CALM2-D130G, and CALM3-D130G mutations, providing proof-of-principle for pan-calmodulinopathy gene therapy.\",\n      \"method\": \"shRNA knockdown efficiency assay in TSA201 cells; voltage-sensing dye APD90 measurement in patient iPSC-derived cardiomyocytes; transfection of SupRep construct\",\n      \"journal\": \"Circulation. Arrhythmia and electrophysiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue in patient-specific iPSC-CMs with multiple CALM variant lines, single lab\",\n      \"pmids\": [\"39069900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Erianin targets and binds to CALM1 protein, enhancing its stability and subsequently increasing phosphorylation of CAMKK2, facilitating autophagy in 5-FU-resistant colorectal cancer cells and reversing drug resistance.\",\n      \"method\": \"Drug-target binding assay; Western blotting for CALM1 stability and CAMKK2 phosphorylation; autophagy marker immunofluorescence; xenograft tumor model\",\n      \"journal\": \"Chemico-biological interactions\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, abstract does not specify binding assay methodology (e.g., SPR, ITC), limited mechanistic detail on CALM1–CAMKK2 interaction\",\n      \"pmids\": [\"40976489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The CALM1 p.F90L missense mutation, identified by exome sequencing in a family with idiopathic ventricular fibrillation, affects a residue (F90) previously shown to mediate direct interaction of calmodulin with target peptides, supporting a mechanism whereby disruption of CaM–target interaction underlies arrhythmia.\",\n      \"method\": \"Exome sequencing; segregation analysis; mechanistic inference from prior structural/biochemical literature on F90-mediated target peptide interaction\",\n      \"journal\": \"Journal of the American College of Cardiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genetic identification only; mechanistic claim about F90 and target peptide interaction is cited from prior literature, not re-demonstrated experimentally in this paper\",\n      \"pmids\": [\"24076290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CALM3 is at least 5-fold more actively transcribed than CALM1 or CALM2 in proliferating human teratoma cells; the 5' untranslated regions of each CALM gene are necessary to recover full promoter activation in transient transfection assays, indicating differential transcriptional regulation among the three CALM genes.\",\n      \"method\": \"Quantitative mRNA abundance measurement; nuclear run-on transcription assay; luciferase reporter transfection with and without 5' UTR\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal assays (run-on, mRNA quantification, reporter) in a single study establishing differential transcriptional activity and 5' UTR requirement\",\n      \"pmids\": [\"9681195\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CALM1 encodes calmodulin, a Ca²⁺ sensor protein whose pathogenic missense variants (e.g., F142L, N98S, E141G) impair Ca²⁺-dependent inactivation (CDI) of the cardiac L-type calcium channel CaV1.2, leading to prolonged action potential duration and ventricular arrhythmias; additionally, CALM1 participates in neuronal migration and axon elongation through a CaM-dependent pathway, and its long 3'-UTR isoform has isoform-specific roles in neural development, while the three CALM genes exhibit differential transcriptional activity with CALM1's 5' UTR being required for full promoter activation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CALM1 encodes calmodulin, a Ca²⁺ sensor that governs Ca²⁺-dependent inactivation (CDI) of the cardiac L-type calcium channel CaV1.2, and pathogenic missense variants in this protein cause inherited ventricular arrhythmia syndromes (calmodulinopathies) [#0, #1]. Disease variants act through distinct but converging defects: E141G reduces Ca²⁺-binding affinity ~11-fold and produces a dominant loss of CaV1.2 CDI with mild accentuation of NaV1.5 late current but no effect on RyR2-mediated Ca²⁺ release [#0]; F142L severely impairs CDI of ICaL, augmenting plateau-phase inward current and prolonging repolarization in a manner reversed by the ICaL blocker verapamil [#1]; and N98S confers β-adrenergically induced ICaL dysregulation that promotes delayed and early afterdepolarization-driven triggered activity [#2]. Because the three CALM genes are functionally interchangeable at the protein level, suppression of all three calmodulin transcripts combined with replacement of a shRNA-immune CALM1 cDNA shortens pathologically prolonged action potential duration across CALM1, CALM2, and CALM3 variant cardiomyocytes, establishing a pan-calmodulinopathy therapeutic strategy [#7]. Beyond the heart, CALM1 has a non-redundant role in neuronal migration: knockdown of Calm1 (but not its paralogs) disrupts both tangential and radial precerebellar neuron migration [#3], and its long 3'-UTR isoform, generated by alternative polyadenylation in neural tissue, is required for dorsal root ganglion neuron migration and experience-induced hippocampal activation [#6]. Calmodulin protein output in axons is itself regulated post-transcriptionally, with FMRP and miR-181d repressing Calm1 mRNA in axonal granules until NGF triggers its release to support local translation and axon elongation [#5]. CALM1 transcription is controlled by its core promoter and 5' UTR, and CaM-dependent signaling supports expression of cartilage matrix genes Col2a1 and Agc1 in chondrocytes [#4, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established that the three calmodulin-encoding genes are not transcriptionally equivalent, raising the question of gene-specific regulation despite identical protein products.\",\n      \"evidence\": \"Nuclear run-on, mRNA quantification, and 5' UTR luciferase reporter assays in human teratoma cells\",\n      \"pmids\": [\"9681195\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not identify the trans-factors driving differential CALM gene transcription\", \"Performed in a single proliferating cell type\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected CALM1 promoter activity and CaM signaling to a downstream biological output, placing calmodulin upstream of cartilage matrix gene expression.\",\n      \"evidence\": \"Promoter SNP luciferase reporter assays plus pharmacological CaM inhibition with Col2a1/Agc1 readout in chondrogenic cells\",\n      \"pmids\": [\"15746150\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pharmacological CaM inhibition is not CALM1-specific\", \"Direct transcriptional targets of CaM signaling not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked CALM1 genetically to inherited ventricular fibrillation, implicating disruption of CaM–target peptide interaction as an arrhythmia mechanism.\",\n      \"evidence\": \"Exome sequencing and segregation analysis in a family with idiopathic VF; mechanistic inference from prior structural literature on residue F90\",\n      \"pmids\": [\"24076290\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"F90 mechanistic role cited from prior literature, not re-demonstrated experimentally here\", \"No functional channel assay for the F90L variant\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated a non-redundant neurodevelopmental role for Calm1 distinct from its paralogs, answering whether the three calmodulin genes are functionally interchangeable in vivo.\",\n      \"evidence\": \"RNAi knockdown of individual Calm genes in mouse hindbrain with histological analysis of precerebellar neuron migration\",\n      \"pmids\": [\"25519244\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular effectors downstream of Calm1 in migrating neurons unknown\", \"Single lab, acute knockdown only\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed post-transcriptional control of axonal calmodulin levels, showing how Calm1 mRNA is spatially restrained and de-repressed to regulate axon growth.\",\n      \"evidence\": \"Co-IP of FMRP with Calm1 mRNA/miR-181d, genetic perturbations, and local translation assays in primary sensory neurons with NGF stimulation\",\n      \"pmids\": [\"26711345\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP system; direct miR-181d binding site on Calm1 not mapped functionally\", \"Whether this pathway operates in non-sensory neurons unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the biophysical mechanism of a calmodulinopathy variant, showing reduced Ca²⁺ affinity translates to dominant loss of CaV1.2 inactivation rather than RyR2 dysfunction.\",\n      \"evidence\": \"Ca²⁺-binding affinity assay, patch-clamp of CaV1.2 and NaV1.5, and intracellular Ca²⁺ release assay in heterologous systems for E141G\",\n      \"pmids\": [\"26969752\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Heterologous expression may not capture native cardiomyocyte channel context\", \"Contribution of NaV1.5 late current to phenotype not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Confirmed CDI impairment as the primary arrhythmic mechanism in a patient-relevant model and showed it is pharmacologically reversible.\",\n      \"evidence\": \"Patch-clamp and Ca²⁺ measurements in patient-derived hiPSC-CMs with dynamic clamp and verapamil rescue for F142L\",\n      \"pmids\": [\"28158429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Verapamil rescue is mechanistic proof-of-concept, not a clinical therapy\", \"Variant-specific differences across calmodulinopathy mutations not addressed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established an in vivo arrhythmia mechanism for the N98S variant, showing β-adrenergic stress unmasks ICaL dysregulation that drives triggered activity.\",\n      \"evidence\": \"CRISPR knock-in mouse, patch-clamp, optical voltage mapping, Ca²⁺ imaging, and His-Purkinje microelectrode recordings with β-adrenergic modulation\",\n      \"pmids\": [\"32929985\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mouse cardiac electrophysiology differs from human\", \"Molecular basis of the β-adrenergic sensitivity not fully resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified an isoform-specific neural function for the long 3'-UTR Calm1 mRNA, separating coding-independent regulatory roles from protein function.\",\n      \"evidence\": \"CRISPR deletion of the distal poly(A) site, smFISH localization, and in vivo DRG migration and hippocampal activation phenotyping in knock-in mice\",\n      \"pmids\": [\"32522888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trans-factors binding the long 3'-UTR not identified\", \"Mechanism linking isoform to phenotypes undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided proof-of-principle that a single suppression-and-replacement construct can correct the action potential phenotype across all three calmodulin genes, exploiting their protein-level redundancy therapeutically.\",\n      \"evidence\": \"shRNA knockdown plus shRNA-immune CALM1 cDNA replacement with APD90 measurement in patient iPSC-CMs carrying CALM1/CALM2/CALM3 variants\",\n      \"pmids\": [\"39069900\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro iPSC-CM model only; no in vivo delivery demonstrated\", \"Long-term safety and off-target effects not assessed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated CALM1 in a cancer drug-resistance pathway via stabilization and CAMKK2-linked autophagy, extending calmodulin function beyond cardiac and neural contexts.\",\n      \"evidence\": \"Drug-target binding assay, Western blot for CALM1 stability and CAMKK2 phosphorylation, autophagy markers, and xenograft model in 5-FU-resistant colorectal cancer\",\n      \"pmids\": [\"40976489\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Binding assay methodology unspecified (no SPR/ITC)\", \"Direct CALM1–CAMKK2 interaction not mechanistically detailed\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How calmodulin's identical protein product is differentially deployed across cardiac, neuronal, and chondrogenic contexts — and which target effectors mediate each role — remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tissue-specific CaM target effectors largely uncharacterized in this corpus\", \"Structural basis distinguishing variant-specific CDI defects not unified\", \"Regulatory factors governing CALM gene/isoform expression not identified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006468\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CACNA1C\", \"SCN5A\", \"FMR1\", \"CAMKK2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}