{"gene":"TRIM63","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2001,"finding":"TRIM63/SMRZ is a novel striated muscle-specific RING zinc finger protein that interacts with SMT3b (a ubiquitin-like/SUMO protein) through its RING domain; mutagenesis of conserved RING domain residues abolished this interaction. Transient transfection showed nuclear localization in C2C12 myoblasts.","method":"Yeast two-hybrid screening, co-immunoprecipitation, RING domain mutagenesis, fluorescence microscopy in C2C12 cells","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction confirmed by mutagenesis and pulldown, single lab, two orthogonal methods","pmids":["11283016"],"is_preprint":false},{"year":2005,"finding":"MuRF-1/TRIM63 binds a specific subset of myofibrillar proteins including titin, nebulin, NRAP, troponin-I (TnI), troponin-T (TnT), myosin light chain 2 (MLC-2), myotilin, and T-cap via yeast two-hybrid; the TnI and titin binding sites map to motifs highly conserved between MURF-1 and MURF-2. Western blot in MURF-1 KO mice showed reduced ubiquitination of MLC-2 and TnI, consistent with TRIM63 being their E3 ligase in vivo. TRIM63 also interacts with 11 enzymes in ATP/energy production pathways including mitochondrial ATP synthase and cytoplasmic creatine kinase.","method":"Yeast two-hybrid screening of skeletal muscle cDNA library, peptide scan binding mapping, Western blot on MURF-1 KO cardiac tissue","journal":"Journal of Molecular Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Y2H, peptide scans, KO mouse western blot), multiple substrates identified and validated","pmids":["15967462"],"is_preprint":false},{"year":2006,"finding":"In a rat model of chronic heart failure (CHF), TNF-α induces Murf-1/TRIM63 expression via the p42/44 MAPK pathway (whereas MAFbx induction is p38MAPK-dependent). Murf-1/TRIM63 mediates TNF-α-induced troponin I ubiquitination and subsequent degradation, leading to impaired cardiomyocyte contractility; siRNA against Murf-1 completely abrogated troponin I ubiquitination, degradation, and the decline in contractility.","method":"Rat CHF model (coronary artery ligation), neonatal rat cardiomyocyte culture, TNF-α stimulation, pharmacological MAPK inhibitors, siRNA knockdown, Western blot, contractility measurement","journal":"Cardiovascular Research","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA knockdown with defined molecular phenotype (troponin I ubiquitination/degradation) and functional readout (contractility), pathway dissection with inhibitors","pmids":["17145048"],"is_preprint":false},{"year":2007,"finding":"The crystal structure of titin A168-A170 modules (the MuRF-1 docking region near the titin kinase domain) was resolved. A C-terminal helical domain of MuRF-1/TRIM63 is sufficient to bind the A168-A170 region with high affinity, docking into a shallow surface groove spanning its full length; a loop protrusion in A168-A170 is a key mediator of MuRF-1 recognition (confirmed by pull-down assays). Interaction affinity characterized by isothermal calorimetry.","method":"X-ray crystallography of titin A168-A170, circular dichroism of MuRF-1 variants, isothermal calorimetry, SPOTS blots, pull-down assays","journal":"FASEB Journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with biophysical binding assays and mutagenesis-equivalent functional pull-downs, multiple orthogonal methods in one study","pmids":["17215480"],"is_preprint":false},{"year":2012,"finding":"Human TRIM63 missense variants (p.A48V, p.I130M) and a deletion (p.Q247*) identified in HCM patients cause mislocalization of TRIM63 to sarcomere Z disks (rather than M-line), impaired auto-ubiquitination, and reduced ubiquitination and UPS-mediated degradation of myosin heavy chain 6, cardiac myosin binding protein C, calcineurin (PPP3CB), and p-MTOR in adult cardiac myocytes. Inducible expression of mutant TRIM63 in mouse heart caused cardiac hypertrophy with activation of MTOR-S6K and calcineurin pathways.","method":"TRIM63 gene sequencing in HCM probands, expression of mutant TRIM63 in adult cardiac myocytes, auto-ubiquitination assay, ubiquitination assay for substrates, immunofluorescence (localization), inducible transgenic mouse model with cardiac hypertrophy readout","journal":"Circulation Research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro ubiquitination assays, subcellular localization, and in vivo mouse model with multiple orthogonal methods establishing loss-of-function mechanism","pmids":["22821932"],"is_preprint":false},{"year":2013,"finding":"TRIM63 regulates fasting-induced turnover of nicotinic acetylcholine receptors (CHRN) at the neuromuscular junction via selective autophagy. TRIM63 co-localizes with SQSTM1, SH3GLB1, and MAP1LC3A on endo/lysosomal vesicles containing endocytosed CHRN. In trim63(-/-) mice, denervation-induced upregulation of SQSTM1 and LC3-II was abolished, and SQSTM1 did not colocalize with CHRN vesicles. SQSTM1 and LC3-II co-precipitated with surface-labeled/endocytosed CHRN.","method":"Trim63 knockout mice (denervation model), immunofluorescence colocalization, co-immunoprecipitation, ATG7 knockout comparison, LAMP1/LC3 vesicle characterization","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, KO mouse with defined cellular phenotype (NMJ remodeling), multiple orthogonal methods including colocalization and genetic ablation","pmids":["24220501"],"is_preprint":false},{"year":2014,"finding":"SMAD3 augments FoxO3-induced MuRF-1/TRIM63 promoter activity in a DNA-binding-dependent manner. FoxO3 and SMAD3 coexpression synergistically increases MuRF-1 mRNA and promoter activity; mutation of the SMAD-binding element (SBE) in the proximal MuRF-1 promoter or overexpression of a SMAD3 DNA-binding mutant attenuated FoxO3-dependent MuRF-1 promoter activation. Chromatin immunoprecipitation showed that SMAD3 DNA binding increases FoxO3 abundance at the promoter, and SMAD3 overexpression increases FoxO3 protein content.","method":"MuRF-1 promoter luciferase reporter assays in cultured myotubes and HEK293 cells, SBE mutagenesis, SMAD3 DNA-binding domain mutant overexpression, chromatin immunoprecipitation, qRT-PCR","journal":"American Journal of Physiology – Cell Physiology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — promoter mutagenesis, ChIP, and multiple reporter assays in single lab with orthogonal methods establishing mechanism of transcriptional regulation","pmids":["24920680"],"is_preprint":false},{"year":2014,"finding":"miR-19a/b directly target TRIM63/MuRF-1 (and atrogin-1) as demonstrated by luciferase reporter assays; overexpression of miR-19a/b in rat neonatal cardiomyocytes down-regulated endogenous MuRF-1 expression and was sufficient to induce cardiomyocyte hypertrophy with elevated calcineurin/NFAT signaling.","method":"Luciferase reporter assay with MuRF-1 3'UTR, miR-19a/b overexpression in neonatal rat cardiomyocytes, Western blot, cell size measurement","journal":"The Biochemical Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase assay confirms direct targeting plus functional phenotype, single lab","pmids":["24117217"],"is_preprint":false},{"year":2016,"finding":"TAp63 and p53 transactivate the TRIM63 (MuRF1) promoter and increase Trim63 expression. p63 protein levels increase in atrophic muscle fibers via denervation-dependent and -independent mechanisms in ALS models. This identifies TAp63 as a transcriptional regulator of TRIM63 contributing to muscular atrophy in ALS.","method":"Transcriptomic meta-analysis of ALS patient/mouse muscle, promoter reporter assays (transactivation by TAp63/p53), immunohistochemistry for p63 protein in ALS muscle fibers, denervation models","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter transactivation assay plus in vivo protein localization in disease model, single lab","pmids":["26919175"],"is_preprint":false},{"year":2020,"finding":"Homozygous or compound heterozygous variants in TRIM63 cause autosomal-recessive HCM, distinct from the heterozygous variants previously reported. Clinical evaluation of 16 index cases from 4867 HCM probands confirmed that only biallelic carriers showed disease, whereas heterozygous family members were unaffected, establishing recessive loss-of-function of TRIM63 as causal for HCM with concentric LVH and high rates of LV dysfunction.","method":"Next-generation sequencing of TRIM63 in large HCM cohort, familial segregation analysis, clinical cardiac phenotyping (echocardiography, cardiac MRI with LGE)","journal":"Heart (British Cardiac Society)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — large genetic cohort with familial segregation establishing recessive inheritance; primarily genetic/clinical without in vitro mechanistic experiments on protein function","pmids":["32451364"],"is_preprint":false},{"year":2005,"finding":"MuSK-MG (myasthenia gravis) plasma and purified IgG from a patient with marked muscle atrophy modestly increased MURF-1/TRIM63 expression in C2C12 myotubes and in mouse masseter (facial) muscle in vivo, but not in gastrocnemius, suggesting muscle-specific susceptibility. Dexamethasone (corticosteroid) increased MURF-1 expression more markedly in C2C12 cells but did not affect MURF-1 expression in either muscle in vivo.","method":"Quantitative Western blotting in C2C12 myotubes and mouse muscles treated with MuSK-MG plasma/purified IgG or dexamethasone","journal":"Journal of Neuroimmunology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Western blot approach, single lab, modest effect sizes, no direct mechanistic pathway defined","pmids":["16213598"],"is_preprint":false}],"current_model":"TRIM63/MuRF-1 is a striated muscle-specific RING-finger E3 ubiquitin ligase that localizes to the sarcomeric M-line via its C-terminal helical domain binding titin's A168-A170 modules, ubiquitinates a defined set of myofibrillar substrates (including troponin I, troponin T, MLC-2, myosin heavy chain, and cardiac myosin binding protein C) to drive proteasomal degradation, participates in selective autophagy of nicotinic acetylcholine receptors at the neuromuscular junction in complex with SQSTM1 and SH3GLB1, and is transcriptionally regulated by FoxO3/SMAD3 and TAp63/p53; loss-of-function mutations cause autosomal-recessive hypertrophic cardiomyopathy through impaired protein homeostasis and activation of calcineurin and mTOR-S6K hypertrophic pathways."},"narrative":{"mechanistic_narrative":"TRIM63 (MuRF-1) is a striated muscle-specific RING zinc-finger E3 ubiquitin ligase that controls myofibrillar protein homeostasis by targeting sarcomeric proteins for degradation [PMID:11283016, PMID:15967462]. It docks at the sarcomeric M-line region through a C-terminal helical domain that binds the titin A168-A170 modules adjacent to the titin kinase, with a loop protrusion in titin mediating recognition [PMID:17215480]. TRIM63 binds and ubiquitinates a defined set of myofibrillar substrates—including troponin I, troponin T, myosin light chain 2, myosin heavy chain, and cardiac myosin binding protein C—routing them to proteasomal degradation; loss of TRIM63 reduces ubiquitination of MLC-2 and TnI in vivo [PMID:15967462, PMID:22821932]. In cardiomyocytes, TNF-α induces TRIM63 via p42/44 MAPK to drive troponin I ubiquitination and degradation, directly impairing contractility [PMID:17145048]. Beyond the sarcomere, TRIM63 mediates fasting- and denervation-induced selective autophagy of endocytosed nicotinic acetylcholine receptors at the neuromuscular junction, co-localizing with SQSTM1, SH3GLB1, and MAP1LC3A on endo/lysosomal vesicles [PMID:24220501]. Its expression is transcriptionally driven by FoxO3 in cooperation with SMAD3 and by TAp63/p53, and post-transcriptionally repressed by miR-19a/b [PMID:24920680, PMID:24117217, PMID:26919175]. Biallelic loss-of-function variants in TRIM63 cause autosomal-recessive hypertrophic cardiomyopathy, with mutant protein mislocalizing to Z disks, failing to auto-ubiquitinate, and failing to degrade substrates including calcineurin and mTOR, thereby activating mTOR-S6K and calcineurin hypertrophic signaling [PMID:22821932, PMID:32451364].","teleology":[{"year":2001,"claim":"Identifying TRIM63 as a striated muscle-specific RING zinc-finger protein interacting with a SUMO/ubiquitin-like protein established its candidacy as a muscle ubiquitin-pathway component before any substrate was known.","evidence":"Yeast two-hybrid, Co-IP, and RING-domain mutagenesis with fluorescence microscopy in C2C12 cells","pmids":["11283016"],"confidence":"Medium","gaps":["No catalytic E3 activity demonstrated","No physiological substrate identified","Nuclear localization in myoblasts not reconciled with later sarcomeric role"]},{"year":2005,"claim":"Mapping TRIM63 binding to a defined panel of myofibrillar proteins and showing reduced substrate ubiquitination in knockout muscle established it as the in vivo E3 ligase for sarcomeric components.","evidence":"Yeast two-hybrid of skeletal muscle library, peptide-scan binding mapping, Western blot on MuRF-1 KO cardiac tissue","pmids":["15967462"],"confidence":"High","gaps":["In vitro reconstitution of ubiquitin transfer to each substrate not shown","Functional consequence of metabolic-enzyme interactions undefined"]},{"year":2007,"claim":"Solving the titin A168-A170 structure and showing a TRIM63 C-terminal helix binds it with high affinity defined the structural basis of M-line localization.","evidence":"X-ray crystallography, circular dichroism, isothermal calorimetry, SPOTS blots, pull-down assays","pmids":["17215480"],"confidence":"High","gaps":["Functional consequence of docking for substrate selection not established","No full-length TRIM63 structure"]},{"year":2006,"claim":"Linking TNF-α to TRIM63 induction via p42/44 MAPK and to troponin I degradation connected inflammatory signaling to contractile dysfunction in heart failure.","evidence":"Rat CHF model, neonatal cardiomyocyte culture with MAPK inhibitors, siRNA knockdown, contractility measurement","pmids":["17145048"],"confidence":"High","gaps":["Direct E3 transfer of ubiquitin to TnI not reconstituted","Whether MAPK acts solely transcriptionally unresolved"]},{"year":2013,"claim":"Demonstrating TRIM63-dependent selective autophagy of acetylcholine receptors extended its role beyond proteasomal sarcomere turnover to NMJ remodeling.","evidence":"Trim63 KO mice with denervation, immunofluorescence colocalization, reciprocal Co-IP, ATG7 KO comparison","pmids":["24220501"],"confidence":"High","gaps":["Whether TRIM63 ubiquitinates CHRN directly to mark it for autophagy unclear","Role of E3 activity vs scaffolding in autophagy undefined"]},{"year":2014,"claim":"Identifying FoxO3/SMAD3 cooperation and miR-19a/b repression defined how TRIM63 levels are set transcriptionally and post-transcriptionally during atrophy and hypertrophy.","evidence":"Promoter luciferase reporters, SBE mutagenesis, ChIP, and 3'UTR luciferase assays with miRNA overexpression","pmids":["24920680","24117217"],"confidence":"Medium","gaps":["In vivo contribution of each regulatory input not quantified","Interplay between transcriptional and miRNA control untested together"]},{"year":2016,"claim":"Showing TAp63/p53 transactivate the TRIM63 promoter linked TRIM63 to muscle atrophy programs in ALS.","evidence":"Transcriptomic meta-analysis, promoter transactivation reporters, p63 immunohistochemistry in ALS muscle","pmids":["26919175"],"confidence":"Medium","gaps":["Direct p63 promoter occupancy by ChIP not shown","Causal contribution of TRIM63 to ALS atrophy not tested by ablation"]},{"year":2012,"claim":"HCM patient variants causing Z-disk mislocalization, loss of auto-ubiquitination, and failure to degrade calcineurin/mTOR substrates established a loss-of-function mechanism activating hypertrophic signaling.","evidence":"TRIM63 sequencing in HCM probands, ubiquitination assays, immunofluorescence, inducible transgenic mouse","pmids":["22821932"],"confidence":"High","gaps":["Heterozygous vs biallelic causality not resolved at this stage","Whether mutant acts dominant-negative or simple loss undefined"]},{"year":2020,"claim":"A large cohort with familial segregation established that only biallelic TRIM63 variants cause HCM, refining the inheritance model to autosomal recessive.","evidence":"NGS of large HCM cohort, familial segregation, cardiac MRI/echocardiography phenotyping","pmids":["32451364"],"confidence":"Medium","gaps":["No in vitro protein-function assays in this study","Genotype-phenotype correlations across variants incomplete"]},{"year":null,"claim":"How TRIM63 selects between proteasomal degradation and autophagic routing of substrates, and how its M-line docking dictates substrate access, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No mechanism linking titin docking to substrate choice","Determinants of proteasome vs autophagy fate undefined","Full-length enzyme-substrate structural model lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,4]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[6,8]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,3,4]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,2,4]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[5]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[1,2]}],"complexes":[],"partners":["TTN","TNNI3","TNNT","MYL2","SQSTM1","SH3GLB1","MAP1LC3A","PPP3CB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q969Q1","full_name":"E3 ubiquitin-protein ligase TRIM63","aliases":["Iris RING finger protein","Muscle-specific RING finger protein 1","MuRF-1","MuRF1","RING finger protein 28","RING-type E3 ubiquitin transferase TRIM63","Striated muscle RING zinc finger protein","Tripartite motif-containing protein 63"],"length_aa":353,"mass_kda":40.2,"function":"E3 ubiquitin ligase. Mediates the ubiquitination and subsequent proteasomal degradation of CKM, GMEB1 and HIBADH. Regulates the proteasomal degradation of muscle proteins under amino acid starvation, where muscle protein is catabolized to provide other organs with amino acids. Inhibits de novo skeletal muscle protein synthesis under amino acid starvation. Regulates proteasomal degradation of cardiac troponin I/TNNI3 and probably of other sarcomeric-associated proteins. May play a role in striated muscle atrophy and hypertrophy by regulating an anti-hypertrophic PKC-mediated signaling pathway. May regulate the organization of myofibrils through TTN in muscle cells","subcellular_location":"Cytoplasm; Nucleus; Cytoplasm, myofibril, sarcomere, M line; Cytoplasm, myofibril, sarcomere, Z line","url":"https://www.uniprot.org/uniprotkb/Q969Q1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRIM63","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRIM63","total_profiled":1310},"omim":[{"mim_id":"621270","title":"CARDIOMYOPATHY, FAMILIAL HYPERTROPHIC, 31; CMH31","url":"https://www.omim.org/entry/621270"},{"mim_id":"620942","title":"SYNPO2 INTRON SENSE-OVERLAPPING LONG NONCODING RNA","url":"https://www.omim.org/entry/620942"},{"mim_id":"616755","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 62; TRIM62","url":"https://www.omim.org/entry/616755"},{"mim_id":"607212","title":"CASPASE RECRUITMENT DOMAIN-CONTAINING PROTEIN 9; CARD9","url":"https://www.omim.org/entry/607212"},{"mim_id":"606831","title":"NLR FAMILY, CASPASE RECRUITMENT DOMAIN-CONTAINING 4; NLRC4","url":"https://www.omim.org/entry/606831"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skeletal muscle","ntpm":1847.0}],"url":"https://www.proteinatlas.org/search/TRIM63"},"hgnc":{"alias_symbol":["MURF-1","IRF","SMRZ"],"prev_symbol":["RNF28"]},"alphafold":{"accession":"Q969Q1","domains":[{"cath_id":"3.30.40.10","chopping":"14-59_70-112","consensus_level":"high","plddt":87.8049,"start":14,"end":112},{"cath_id":"-","chopping":"173-300","consensus_level":"medium","plddt":92.2623,"start":173,"end":300}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q969Q1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q969Q1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q969Q1-F1-predicted_aligned_error_v6.png","plddt_mean":82.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRIM63","jax_strain_url":"https://www.jax.org/strain/search?query=TRIM63"},"sequence":{"accession":"Q969Q1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q969Q1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q969Q1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q969Q1"}},"corpus_meta":[{"pmid":"16125763","id":"PMC_16125763","title":"Identification and characterization of MAVS, a mitochondrial antiviral signaling protein that activates NF-kappaB and IRF 3.","date":"2005","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/16125763","citation_count":2767,"is_preprint":false},{"pmid":"11244049","id":"PMC_11244049","title":"IRF family of transcription factors as regulators of host defense.","date":"2001","source":"Annual review of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/11244049","citation_count":1360,"is_preprint":false},{"pmid":"18303999","id":"PMC_18303999","title":"The IRF family transcription factors in immunity and oncogenesis.","date":"2008","source":"Annual review of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/18303999","citation_count":1045,"is_preprint":false},{"pmid":"7637809","id":"PMC_7637809","title":"An IRF-1-dependent pathway of DNA damage-induced apoptosis in mitogen-activated T lymphocytes.","date":"1995","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/7637809","citation_count":417,"is_preprint":false},{"pmid":"17395583","id":"PMC_17395583","title":"Triggering the innate antiviral response through IRF-3 activation.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17395583","citation_count":387,"is_preprint":false},{"pmid":"23251783","id":"PMC_23251783","title":"DNA-PK is a DNA sensor for IRF-3-dependent innate immunity.","date":"2012","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/23251783","citation_count":348,"is_preprint":false},{"pmid":"9422515","id":"PMC_9422515","title":"Structure of IRF-1 with bound DNA reveals determinants of interferon regulation.","date":"1998","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/9422515","citation_count":336,"is_preprint":false},{"pmid":"23787991","id":"PMC_23787991","title":"Specificity through cooperation: BATF-IRF interactions control immune-regulatory networks.","date":"2013","source":"Nature reviews. 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Endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/17971512","citation_count":120,"is_preprint":false},{"pmid":"7559730","id":"PMC_7559730","title":"Regulation of the interferon system and cell growth by the IRF transcription factors.","date":"1995","source":"Journal of cancer research and clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/7559730","citation_count":114,"is_preprint":false},{"pmid":"32933049","id":"PMC_32933049","title":"MuRF1/TRIM63, Master Regulator of Muscle Mass.","date":"2020","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32933049","citation_count":112,"is_preprint":false},{"pmid":"11846974","id":"PMC_11846974","title":"IRF-1 as a negative regulator of cell proliferation.","date":"2002","source":"Journal of interferon & cytokine research : the official journal of the International Society for Interferon and Cytokine 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Cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/24920680","citation_count":51,"is_preprint":false},{"pmid":"16846591","id":"PMC_16846591","title":"Distinct functions of IRF-3 and IRF-7 in IFN-alpha gene regulation and control of anti-tumor activity in primary macrophages.","date":"2006","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/16846591","citation_count":50,"is_preprint":false},{"pmid":"33854184","id":"PMC_33854184","title":"TRIM63 is a sensitive and specific biomarker for MiT family aberration-associated renal cell carcinoma.","date":"2021","source":"Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc","url":"https://pubmed.ncbi.nlm.nih.gov/33854184","citation_count":49,"is_preprint":false},{"pmid":"40246950","id":"PMC_40246950","title":"Ionizable lipid nanoparticles of mRNA vaccines elicit NF-κB and IRF responses through toll-like receptor 4.","date":"2025","source":"NPJ 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Physiology","url":"https://pubmed.ncbi.nlm.nih.gov/18525383","citation_count":43,"is_preprint":false},{"pmid":"11846973","id":"PMC_11846973","title":"IRF regulation of HIV-1 long terminal repeat activity.","date":"2002","source":"Journal of interferon & cytokine research : the official journal of the International Society for Interferon and Cytokine Research","url":"https://pubmed.ncbi.nlm.nih.gov/11846973","citation_count":42,"is_preprint":false},{"pmid":"18778729","id":"PMC_18778729","title":"Structural and functional studies of an IRF-7-like gene from Atlantic salmon.","date":"2009","source":"Developmental and comparative immunology","url":"https://pubmed.ncbi.nlm.nih.gov/18778729","citation_count":41,"is_preprint":false},{"pmid":"18713947","id":"PMC_18713947","title":"IRF-4 functions as a tumor suppressor in early B-cell development.","date":"2008","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/18713947","citation_count":41,"is_preprint":false},{"pmid":"25847975","id":"PMC_25847975","title":"CCL7 and IRF-7 Mediate Hallmark Inflammatory and IFN Responses following Rhinovirus 1B Infection.","date":"2015","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/25847975","citation_count":40,"is_preprint":false},{"pmid":"29753657","id":"PMC_29753657","title":"IRF-1, RIG-I and MDA5 display potent antiviral activities against norovirus coordinately induced by different types of interferons.","date":"2018","source":"Antiviral research","url":"https://pubmed.ncbi.nlm.nih.gov/29753657","citation_count":40,"is_preprint":false},{"pmid":"40263613","id":"PMC_40263613","title":"IL-10 targets IRF transcription factors to suppress IFN and inflammatory response genes by epigenetic mechanisms.","date":"2025","source":"Nature 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Mass.)","url":"https://pubmed.ncbi.nlm.nih.gov/11147573","citation_count":38,"is_preprint":false},{"pmid":"11175354","id":"PMC_11175354","title":"A novel role for IRF-1 as a suppressor of apoptosis.","date":"2000","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/11175354","citation_count":38,"is_preprint":false},{"pmid":"9204971","id":"PMC_9204971","title":"Expression of interferon regulatory factor (IRF) genes and response to interferon-alpha in chronic myeloid leukaemia.","date":"1997","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/9204971","citation_count":38,"is_preprint":false},{"pmid":"21304964","id":"PMC_21304964","title":"Skeletal muscle 11beta-HSD1 controls glucocorticoid-induced proteolysis and expression of E3 ubiquitin ligases atrogin-1 and MuRF-1.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21304964","citation_count":37,"is_preprint":false},{"pmid":"11283016","id":"PMC_11283016","title":"A novel human striated muscle RING zinc finger protein, SMRZ, interacts with SMT3b via its RING domain.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11283016","citation_count":36,"is_preprint":false},{"pmid":"16857162","id":"PMC_16857162","title":"Alternative splicing variants of IRF-1 lacking exons 7, 8, and 9 in cervical cancer.","date":"2006","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/16857162","citation_count":36,"is_preprint":false},{"pmid":"18079498","id":"PMC_18079498","title":"IRF-1 gene variations influence IgE regulation and atopy.","date":"2007","source":"American journal of respiratory and critical care medicine","url":"https://pubmed.ncbi.nlm.nih.gov/18079498","citation_count":35,"is_preprint":false},{"pmid":"19896215","id":"PMC_19896215","title":"The gene and virus-induced expression of IRF-5 in grass carp Ctenopharyngodon idella.","date":"2009","source":"Veterinary immunology and immunopathology","url":"https://pubmed.ncbi.nlm.nih.gov/19896215","citation_count":34,"is_preprint":false},{"pmid":"32373120","id":"PMC_32373120","title":"IRF-7 Mediates Type I IFN Responses in Endotoxin-Challenged Mice.","date":"2020","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/32373120","citation_count":32,"is_preprint":false},{"pmid":"20585039","id":"PMC_20585039","title":"Cooperation between deficiencies of IRF-4 and IRF-8 promotes both myeloid and lymphoid tumorigenesis.","date":"2010","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/20585039","citation_count":32,"is_preprint":false},{"pmid":"27379868","id":"PMC_27379868","title":"Specificity and Function of IRF Family Transcription Factors: Insights from Genomics.","date":"2016","source":"Journal of interferon & cytokine research : the official journal of the International Society for Interferon and Cytokine Research","url":"https://pubmed.ncbi.nlm.nih.gov/27379868","citation_count":31,"is_preprint":false},{"pmid":"32826280","id":"PMC_32826280","title":"The Structural Basis of IRF-3 Activation upon Phosphorylation.","date":"2020","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/32826280","citation_count":31,"is_preprint":false},{"pmid":"34168656","id":"PMC_34168656","title":"The cGAS/STING-TBK1-IRF Regulatory Axis Orchestrates a Primitive Interferon-Like Antiviral Mechanism in Oyster.","date":"2021","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/34168656","citation_count":31,"is_preprint":false},{"pmid":"26011589","id":"PMC_26011589","title":"IRF-1 inhibits NF-κB activity, suppresses TRAF2 and cIAP1 and induces breast cancer cell specific growth inhibition.","date":"2015","source":"Cancer biology & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/26011589","citation_count":31,"is_preprint":false},{"pmid":"26919175","id":"PMC_26919175","title":"Transcriptional activator TAp63 is upregulated in muscular atrophy during ALS and induces the pro-atrophic ubiquitin ligase Trim63.","date":"2016","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/26919175","citation_count":30,"is_preprint":false},{"pmid":"31597276","id":"PMC_31597276","title":"Sabinene Prevents Skeletal Muscle Atrophy by Inhibiting the MAPK-MuRF-1 Pathway in Rats.","date":"2019","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31597276","citation_count":30,"is_preprint":false},{"pmid":"30067973","id":"PMC_30067973","title":"IRF-5 Promotes Cell Death in CD4 T Cells during Chronic Infection.","date":"2018","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/30067973","citation_count":30,"is_preprint":false},{"pmid":"9472983","id":"PMC_9472983","title":"Altered DNA repair and dysregulation of p53 in IRF-1 null hepatocytes.","date":"1998","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/9472983","citation_count":30,"is_preprint":false},{"pmid":"23432902","id":"PMC_23432902","title":"MuRF-1 and p-GSK3β expression in muscle atrophy of cirrhosis.","date":"2013","source":"Liver international : official journal of the International Association for the Study of the Liver","url":"https://pubmed.ncbi.nlm.nih.gov/23432902","citation_count":27,"is_preprint":false},{"pmid":"21900395","id":"PMC_21900395","title":"IRF-1 expression is essential for natural killer cells to suppress metastasis.","date":"2011","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/21900395","citation_count":27,"is_preprint":false},{"pmid":"27576490","id":"PMC_27576490","title":"Tick-borne encephalitis virus induces chemokine RANTES expression via activation of IRF-3 pathway.","date":"2016","source":"Journal of neuroinflammation","url":"https://pubmed.ncbi.nlm.nih.gov/27576490","citation_count":27,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47676,"output_tokens":3890,"usd":0.100689,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11078,"output_tokens":3333,"usd":0.069358,"stage2_stop_reason":"end_turn"},"total_usd":0.170047,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify papers that are specifically about TRIM63 (also known as MuRF-1, MURF-1, IRF, SMRZ, RNF28) — the muscle RING finger protein / E3 ubiquitin ligase expressed in striated muscle. \n\nThe vast majority of papers in this corpus are about IRF (Interferon Regulatory Factor) family transcription factors, which share the alias \"IRF\" with TRIM63 but are completely different proteins. I need to carefully distinguish:\n- TRIM63/MuRF-1/SMRZ: muscle-specific E3 ubiquitin ligase\n- IRF-1, IRF-3, IRF-7, etc.: interferon regulatory factor transcription factors (different genes)\n\nPapers clearly about TRIM63/MuRF-1: [12], [25], [30], [41], [42], [43], [79], [84], [94], [38], [53], [62], [57]\n\nLet me also check borderline papers: [64] discusses TRIM63 as biomarker in RCC — expression study, no mechanism. [15], [28], [47], [52], [69], [83], [95], [98] — mostly expression/regulation studies of MuRF-1 in atrophy contexts without direct mechanistic experiments on TRIM63 protein itself.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"TRIM63/SMRZ is a novel striated muscle-specific RING zinc finger protein that interacts with SMT3b (a ubiquitin-like/SUMO protein) through its RING domain; mutagenesis of conserved RING domain residues abolished this interaction. Transient transfection showed nuclear localization in C2C12 myoblasts.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, RING domain mutagenesis, fluorescence microscopy in C2C12 cells\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction confirmed by mutagenesis and pulldown, single lab, two orthogonal methods\",\n      \"pmids\": [\"11283016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MuRF-1/TRIM63 binds a specific subset of myofibrillar proteins including titin, nebulin, NRAP, troponin-I (TnI), troponin-T (TnT), myosin light chain 2 (MLC-2), myotilin, and T-cap via yeast two-hybrid; the TnI and titin binding sites map to motifs highly conserved between MURF-1 and MURF-2. Western blot in MURF-1 KO mice showed reduced ubiquitination of MLC-2 and TnI, consistent with TRIM63 being their E3 ligase in vivo. TRIM63 also interacts with 11 enzymes in ATP/energy production pathways including mitochondrial ATP synthase and cytoplasmic creatine kinase.\",\n      \"method\": \"Yeast two-hybrid screening of skeletal muscle cDNA library, peptide scan binding mapping, Western blot on MURF-1 KO cardiac tissue\",\n      \"journal\": \"Journal of Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Y2H, peptide scans, KO mouse western blot), multiple substrates identified and validated\",\n      \"pmids\": [\"15967462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In a rat model of chronic heart failure (CHF), TNF-α induces Murf-1/TRIM63 expression via the p42/44 MAPK pathway (whereas MAFbx induction is p38MAPK-dependent). Murf-1/TRIM63 mediates TNF-α-induced troponin I ubiquitination and subsequent degradation, leading to impaired cardiomyocyte contractility; siRNA against Murf-1 completely abrogated troponin I ubiquitination, degradation, and the decline in contractility.\",\n      \"method\": \"Rat CHF model (coronary artery ligation), neonatal rat cardiomyocyte culture, TNF-α stimulation, pharmacological MAPK inhibitors, siRNA knockdown, Western blot, contractility measurement\",\n      \"journal\": \"Cardiovascular Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA knockdown with defined molecular phenotype (troponin I ubiquitination/degradation) and functional readout (contractility), pathway dissection with inhibitors\",\n      \"pmids\": [\"17145048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The crystal structure of titin A168-A170 modules (the MuRF-1 docking region near the titin kinase domain) was resolved. A C-terminal helical domain of MuRF-1/TRIM63 is sufficient to bind the A168-A170 region with high affinity, docking into a shallow surface groove spanning its full length; a loop protrusion in A168-A170 is a key mediator of MuRF-1 recognition (confirmed by pull-down assays). Interaction affinity characterized by isothermal calorimetry.\",\n      \"method\": \"X-ray crystallography of titin A168-A170, circular dichroism of MuRF-1 variants, isothermal calorimetry, SPOTS blots, pull-down assays\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with biophysical binding assays and mutagenesis-equivalent functional pull-downs, multiple orthogonal methods in one study\",\n      \"pmids\": [\"17215480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human TRIM63 missense variants (p.A48V, p.I130M) and a deletion (p.Q247*) identified in HCM patients cause mislocalization of TRIM63 to sarcomere Z disks (rather than M-line), impaired auto-ubiquitination, and reduced ubiquitination and UPS-mediated degradation of myosin heavy chain 6, cardiac myosin binding protein C, calcineurin (PPP3CB), and p-MTOR in adult cardiac myocytes. Inducible expression of mutant TRIM63 in mouse heart caused cardiac hypertrophy with activation of MTOR-S6K and calcineurin pathways.\",\n      \"method\": \"TRIM63 gene sequencing in HCM probands, expression of mutant TRIM63 in adult cardiac myocytes, auto-ubiquitination assay, ubiquitination assay for substrates, immunofluorescence (localization), inducible transgenic mouse model with cardiac hypertrophy readout\",\n      \"journal\": \"Circulation Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro ubiquitination assays, subcellular localization, and in vivo mouse model with multiple orthogonal methods establishing loss-of-function mechanism\",\n      \"pmids\": [\"22821932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRIM63 regulates fasting-induced turnover of nicotinic acetylcholine receptors (CHRN) at the neuromuscular junction via selective autophagy. TRIM63 co-localizes with SQSTM1, SH3GLB1, and MAP1LC3A on endo/lysosomal vesicles containing endocytosed CHRN. In trim63(-/-) mice, denervation-induced upregulation of SQSTM1 and LC3-II was abolished, and SQSTM1 did not colocalize with CHRN vesicles. SQSTM1 and LC3-II co-precipitated with surface-labeled/endocytosed CHRN.\",\n      \"method\": \"Trim63 knockout mice (denervation model), immunofluorescence colocalization, co-immunoprecipitation, ATG7 knockout comparison, LAMP1/LC3 vesicle characterization\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, KO mouse with defined cellular phenotype (NMJ remodeling), multiple orthogonal methods including colocalization and genetic ablation\",\n      \"pmids\": [\"24220501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SMAD3 augments FoxO3-induced MuRF-1/TRIM63 promoter activity in a DNA-binding-dependent manner. FoxO3 and SMAD3 coexpression synergistically increases MuRF-1 mRNA and promoter activity; mutation of the SMAD-binding element (SBE) in the proximal MuRF-1 promoter or overexpression of a SMAD3 DNA-binding mutant attenuated FoxO3-dependent MuRF-1 promoter activation. Chromatin immunoprecipitation showed that SMAD3 DNA binding increases FoxO3 abundance at the promoter, and SMAD3 overexpression increases FoxO3 protein content.\",\n      \"method\": \"MuRF-1 promoter luciferase reporter assays in cultured myotubes and HEK293 cells, SBE mutagenesis, SMAD3 DNA-binding domain mutant overexpression, chromatin immunoprecipitation, qRT-PCR\",\n      \"journal\": \"American Journal of Physiology – Cell Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — promoter mutagenesis, ChIP, and multiple reporter assays in single lab with orthogonal methods establishing mechanism of transcriptional regulation\",\n      \"pmids\": [\"24920680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-19a/b directly target TRIM63/MuRF-1 (and atrogin-1) as demonstrated by luciferase reporter assays; overexpression of miR-19a/b in rat neonatal cardiomyocytes down-regulated endogenous MuRF-1 expression and was sufficient to induce cardiomyocyte hypertrophy with elevated calcineurin/NFAT signaling.\",\n      \"method\": \"Luciferase reporter assay with MuRF-1 3'UTR, miR-19a/b overexpression in neonatal rat cardiomyocytes, Western blot, cell size measurement\",\n      \"journal\": \"The Biochemical Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase assay confirms direct targeting plus functional phenotype, single lab\",\n      \"pmids\": [\"24117217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TAp63 and p53 transactivate the TRIM63 (MuRF1) promoter and increase Trim63 expression. p63 protein levels increase in atrophic muscle fibers via denervation-dependent and -independent mechanisms in ALS models. This identifies TAp63 as a transcriptional regulator of TRIM63 contributing to muscular atrophy in ALS.\",\n      \"method\": \"Transcriptomic meta-analysis of ALS patient/mouse muscle, promoter reporter assays (transactivation by TAp63/p53), immunohistochemistry for p63 protein in ALS muscle fibers, denervation models\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter transactivation assay plus in vivo protein localization in disease model, single lab\",\n      \"pmids\": [\"26919175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Homozygous or compound heterozygous variants in TRIM63 cause autosomal-recessive HCM, distinct from the heterozygous variants previously reported. Clinical evaluation of 16 index cases from 4867 HCM probands confirmed that only biallelic carriers showed disease, whereas heterozygous family members were unaffected, establishing recessive loss-of-function of TRIM63 as causal for HCM with concentric LVH and high rates of LV dysfunction.\",\n      \"method\": \"Next-generation sequencing of TRIM63 in large HCM cohort, familial segregation analysis, clinical cardiac phenotyping (echocardiography, cardiac MRI with LGE)\",\n      \"journal\": \"Heart (British Cardiac Society)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — large genetic cohort with familial segregation establishing recessive inheritance; primarily genetic/clinical without in vitro mechanistic experiments on protein function\",\n      \"pmids\": [\"32451364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MuSK-MG (myasthenia gravis) plasma and purified IgG from a patient with marked muscle atrophy modestly increased MURF-1/TRIM63 expression in C2C12 myotubes and in mouse masseter (facial) muscle in vivo, but not in gastrocnemius, suggesting muscle-specific susceptibility. Dexamethasone (corticosteroid) increased MURF-1 expression more markedly in C2C12 cells but did not affect MURF-1 expression in either muscle in vivo.\",\n      \"method\": \"Quantitative Western blotting in C2C12 myotubes and mouse muscles treated with MuSK-MG plasma/purified IgG or dexamethasone\",\n      \"journal\": \"Journal of Neuroimmunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Western blot approach, single lab, modest effect sizes, no direct mechanistic pathway defined\",\n      \"pmids\": [\"16213598\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIM63/MuRF-1 is a striated muscle-specific RING-finger E3 ubiquitin ligase that localizes to the sarcomeric M-line via its C-terminal helical domain binding titin's A168-A170 modules, ubiquitinates a defined set of myofibrillar substrates (including troponin I, troponin T, MLC-2, myosin heavy chain, and cardiac myosin binding protein C) to drive proteasomal degradation, participates in selective autophagy of nicotinic acetylcholine receptors at the neuromuscular junction in complex with SQSTM1 and SH3GLB1, and is transcriptionally regulated by FoxO3/SMAD3 and TAp63/p53; loss-of-function mutations cause autosomal-recessive hypertrophic cardiomyopathy through impaired protein homeostasis and activation of calcineurin and mTOR-S6K hypertrophic pathways.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRIM63 (MuRF-1) is a striated muscle-specific RING zinc-finger E3 ubiquitin ligase that controls myofibrillar protein homeostasis by targeting sarcomeric proteins for degradation [#0, #1]. It docks at the sarcomeric M-line region through a C-terminal helical domain that binds the titin A168-A170 modules adjacent to the titin kinase, with a loop protrusion in titin mediating recognition [#3]. TRIM63 binds and ubiquitinates a defined set of myofibrillar substrates—including troponin I, troponin T, myosin light chain 2, myosin heavy chain, and cardiac myosin binding protein C—routing them to proteasomal degradation; loss of TRIM63 reduces ubiquitination of MLC-2 and TnI in vivo [#1, #4]. In cardiomyocytes, TNF-\\u03b1 induces TRIM63 via p42/44 MAPK to drive troponin I ubiquitination and degradation, directly impairing contractility [#2]. Beyond the sarcomere, TRIM63 mediates fasting- and denervation-induced selective autophagy of endocytosed nicotinic acetylcholine receptors at the neuromuscular junction, co-localizing with SQSTM1, SH3GLB1, and MAP1LC3A on endo/lysosomal vesicles [#5]. Its expression is transcriptionally driven by FoxO3 in cooperation with SMAD3 and by TAp63/p53, and post-transcriptionally repressed by miR-19a/b [#6, #7, #8]. Biallelic loss-of-function variants in TRIM63 cause autosomal-recessive hypertrophic cardiomyopathy, with mutant protein mislocalizing to Z disks, failing to auto-ubiquitinate, and failing to degrade substrates including calcineurin and mTOR, thereby activating mTOR-S6K and calcineurin hypertrophic signaling [#4, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identifying TRIM63 as a striated muscle-specific RING zinc-finger protein interacting with a SUMO/ubiquitin-like protein established its candidacy as a muscle ubiquitin-pathway component before any substrate was known.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, and RING-domain mutagenesis with fluorescence microscopy in C2C12 cells\",\n      \"pmids\": [\"11283016\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No catalytic E3 activity demonstrated\", \"No physiological substrate identified\", \"Nuclear localization in myoblasts not reconciled with later sarcomeric role\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Mapping TRIM63 binding to a defined panel of myofibrillar proteins and showing reduced substrate ubiquitination in knockout muscle established it as the in vivo E3 ligase for sarcomeric components.\",\n      \"evidence\": \"Yeast two-hybrid of skeletal muscle library, peptide-scan binding mapping, Western blot on MuRF-1 KO cardiac tissue\",\n      \"pmids\": [\"15967462\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro reconstitution of ubiquitin transfer to each substrate not shown\", \"Functional consequence of metabolic-enzyme interactions undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Solving the titin A168-A170 structure and showing a TRIM63 C-terminal helix binds it with high affinity defined the structural basis of M-line localization.\",\n      \"evidence\": \"X-ray crystallography, circular dichroism, isothermal calorimetry, SPOTS blots, pull-down assays\",\n      \"pmids\": [\"17215480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of docking for substrate selection not established\", \"No full-length TRIM63 structure\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linking TNF-\\u03b1 to TRIM63 induction via p42/44 MAPK and to troponin I degradation connected inflammatory signaling to contractile dysfunction in heart failure.\",\n      \"evidence\": \"Rat CHF model, neonatal cardiomyocyte culture with MAPK inhibitors, siRNA knockdown, contractility measurement\",\n      \"pmids\": [\"17145048\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct E3 transfer of ubiquitin to TnI not reconstituted\", \"Whether MAPK acts solely transcriptionally unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrating TRIM63-dependent selective autophagy of acetylcholine receptors extended its role beyond proteasomal sarcomere turnover to NMJ remodeling.\",\n      \"evidence\": \"Trim63 KO mice with denervation, immunofluorescence colocalization, reciprocal Co-IP, ATG7 KO comparison\",\n      \"pmids\": [\"24220501\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRIM63 ubiquitinates CHRN directly to mark it for autophagy unclear\", \"Role of E3 activity vs scaffolding in autophagy undefined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying FoxO3/SMAD3 cooperation and miR-19a/b repression defined how TRIM63 levels are set transcriptionally and post-transcriptionally during atrophy and hypertrophy.\",\n      \"evidence\": \"Promoter luciferase reporters, SBE mutagenesis, ChIP, and 3'UTR luciferase assays with miRNA overexpression\",\n      \"pmids\": [\"24920680\", \"24117217\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo contribution of each regulatory input not quantified\", \"Interplay between transcriptional and miRNA control untested together\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showing TAp63/p53 transactivate the TRIM63 promoter linked TRIM63 to muscle atrophy programs in ALS.\",\n      \"evidence\": \"Transcriptomic meta-analysis, promoter transactivation reporters, p63 immunohistochemistry in ALS muscle\",\n      \"pmids\": [\"26919175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct p63 promoter occupancy by ChIP not shown\", \"Causal contribution of TRIM63 to ALS atrophy not tested by ablation\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"HCM patient variants causing Z-disk mislocalization, loss of auto-ubiquitination, and failure to degrade calcineurin/mTOR substrates established a loss-of-function mechanism activating hypertrophic signaling.\",\n      \"evidence\": \"TRIM63 sequencing in HCM probands, ubiquitination assays, immunofluorescence, inducible transgenic mouse\",\n      \"pmids\": [\"22821932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Heterozygous vs biallelic causality not resolved at this stage\", \"Whether mutant acts dominant-negative or simple loss undefined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A large cohort with familial segregation established that only biallelic TRIM63 variants cause HCM, refining the inheritance model to autosomal recessive.\",\n      \"evidence\": \"NGS of large HCM cohort, familial segregation, cardiac MRI/echocardiography phenotyping\",\n      \"pmids\": [\"32451364\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro protein-function assays in this study\", \"Genotype-phenotype correlations across variants incomplete\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TRIM63 selects between proteasomal degradation and autophagic routing of substrates, and how its M-line docking dictates substrate access, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No mechanism linking titin docking to substrate choice\", \"Determinants of proteasome vs autophagy fate undefined\", \"Full-length enzyme-substrate structural model lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 4]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [6, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 3, 4]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 2, 4]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TTN\", \"TNNI3\", \"TNNT\", \"MYL2\", \"SQSTM1\", \"SH3GLB1\", \"MAP1LC3A\", \"PPP3CB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}