{"gene":"RBM20","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2012,"finding":"Loss-of-function mutation in RBM20 causes pathological titin isoform expression; RBM20 regulates alternative splicing of titin (TTN) and approximately 30 other cardiac genes conserved between humans and rats, identified by positional cloning in a rat strain with altered titin mRNA splicing and confirmed by deep sequencing of the cardiac transcriptome.","method":"Positional cloning, deep RNA sequencing (transcriptome), loss-of-function rat model","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — positional cloning plus transcriptome-wide sequencing in both rat and human, replicated across species, foundational study","pmids":["22466703"],"is_preprint":false},{"year":2014,"finding":"RBM20 acts as a splicing repressor by binding predominantly within intronic regions near 3' and 5' splice sites via a distinct RNA-recognition element (UCUU motif); RBM20 interacts with U1 and U2 snRNPs and represses splicing by stalling the spliceosome at complex A.","method":"Transcriptome-wide CLIP-seq, RNA-seq, quantitative proteomics (mass spectrometry), cell culture and rat/human hearts","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — CLIP-seq defining binding sites, proteomics identifying spliceosome interaction (U1/U2 snRNPs), multiple orthogonal methods in one rigorous study","pmids":["24960161"],"is_preprint":false},{"year":2013,"finding":"RBM20 mediates titin exon skipping by binding to titin pre-mRNA to repress splicing of specific regions; RBM20 nuclear speckles are aggregates of RBM20 protein on partially processed titin pre-mRNAs; RBM20 also mediates intron retention and exon shuffling; cooperative repression and alternative 3' splice site selection are used to skip different subsets of titin exons.","method":"RNA binding assays, immunofluorescence, splicing reporter assays, knockout rat model","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (binding assays, immunofluorescence, KO model) replicated mechanistic findings","pmids":["23307558"],"is_preprint":false},{"year":2018,"finding":"Phosphorylation of the two serine residues in the RSRSP stretch of RBM20 (S638 and S640 in rats) is constitutive; mutations in this stretch disrupt nuclear localization of RBM20; the RSRSP stretch functions as a critical part of a nuclear localization signal, and S637A knock-in mice display titin isoform changes and DCM-like phenotype.","method":"Phospho-antibody staining, knock-in mouse model (Rbm20 S637A), titin isoform analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knock-in model plus phosphorylation characterization with multiple methods","pmids":["29895960"],"is_preprint":false},{"year":2018,"finding":"Loss of RBM20 causes aberrant splicing of CaMKIIδ, shifting expression toward the δ-A isoform that activates L-type Ca2+ current (ICa,L), resulting in increased ICa,L, intracellular Ca2+ overload, increased sarcoplasmic reticulum Ca2+ content, and spontaneous Ca2+ releases; verapamil (ICa,L antagonist) attenuated these proarrhythmic effects.","method":"Rbm20 knockout mice, cellular electrophysiology patch-clamp, intracellular Ca2+ measurements, pharmacological rescue","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct electrophysiology and Ca2+ measurements in KO cardiomyocytes with pharmacological rescue, multiple orthogonal methods","pmids":["29650543"],"is_preprint":false},{"year":2018,"finding":"The RRM domain and C-terminus of RBM20 are necessary and sufficient for splicing repressor activity; the ZnF2 domain is important for splicing repression; RBM20 binds titin pre-mRNA clusters through the RRM domain and represses upstream and downstream introns; PTB4 is a novel titin splice regulator that counteracts RBM20 repressor activity.","method":"Tissue culture splice reporter assay, in vitro RNA binding assay, truncation mutants","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding and functional splice reporter assays with domain mutagenesis, single lab","pmids":["29518215"],"is_preprint":false},{"year":2019,"finding":"TTN pre-mRNA nucleates RBM20 foci in the nucleus that drive spatial proximity between the TTN locus and other inter-chromosomal RBM20 targets (CACNA1C, CAMK2D), forming a cardiac-specific trans-interacting chromatin domain (TID) functioning as a splicing factory; genome editing studies confirmed this mechanism promotes RBM20-dependent alternative splicing.","method":"Hi-C, RNA-seq, ATAC-seq, genome editing (CRISPR), iPSC-derived cardiomyocytes","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Hi-C 3D genome mapping combined with genome editing functional validation and multiple omics methods","pmids":["30948719"],"is_preprint":false},{"year":2020,"finding":"RBM20 R636S pathogenic variant causes accumulation of dysregulated RNP granules with liquid-like material properties in the sarcoplasm of cardiomyocytes; these granules dock at spaced intervals along cytoskeletal elements, promote phase partitioning of cardiac biomolecules, and fuse with stress granules; confirmed in gene-edited pigs and patient myocardium.","method":"RBM20 gene-edited pigs (R636S homozygous), iPSC-derived cardiomyocytes from patients, live-cell imaging, biochemical analysis of condensates","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — large animal model plus human patient iPSC-CMs, multiple methods confirming RNP granule formation and material properties","pmids":["33188278"],"is_preprint":false},{"year":2020,"finding":"RBM20 nuclear localization is mediated by Transportin-3 (TNPO3) as the main nuclear importer; the direct RBM20–TNPO3 interaction involves the RS domain and is disrupted by pathogenic variants; mislocalized RS-domain mutants retain splice regulatory activity, indicating aberrant cytoplasmic localization (not loss of splicing activity) is the main driver of pathological phenotype; relocalization of mutant RBM20 to nucleus restores splicing and dissolves cytoplasmic granules.","method":"Genome-wide CRISPR knockout screen with image-enabled cell sorting, Co-IP/pulldown (RBM20–TNPO3 interaction), cell culture and animal model rescue experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide CRISPR screen to identify importer, direct interaction validated, functional rescue in cell culture and animal models, multiple orthogonal methods","pmids":["37463913"],"is_preprint":false},{"year":2021,"finding":"DCM-associated missense mutations in RBM20 (e.g., R636S) cause gain-of-function: mutant RBM20 shifts RNA binding preference to 3' UTR sequences shared with ALS-associated RBPs (FUS, DDX6); mutant RBM20 localizes to cytoplasmic processing bodies (DDX6+) under basal conditions and to stress granules (G3BP1+) under acute stress; these mutations produce unique splicing, polyadenylation, and circular RNA defects distinct from KO.","method":"eCLIP, deep RNA-seq, super-resolution microscopy, isogenic iPSC lines with missense mutations and KO, engineered heart tissues","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — eCLIP for direct RNA binding, super-resolution microscopy for localization, isogenic comparison of missense vs. KO with multiple omics methods","pmids":["34732726"],"is_preprint":false},{"year":2022,"finding":"Disruption of the RS domain (nuclear localization signal) is causative for DCM; Rbm20ΔRS mice develop DCM with RBM20 mislocalization to sarcoplasm and granule formation similar to pathogenic mutation knock-in animals; in contrast, mice lacking the RRM domain show mis-splicing but no DCM and no granule formation, establishing that RS domain-mediated nuclear localization (not splicing loss per se) is the critical mechanism for severe DCM.","method":"RS domain deletion knock-in mouse model, RRM deletion mouse model, immunocytochemistry, echocardiography, RNA-seq","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — two genetically distinct mouse models with direct comparison, defining domain-specific contributions to localization vs. splicing","pmids":["37219949"],"is_preprint":false},{"year":2022,"finding":"RBM20 S639G mutation promotes RBM20 trafficking to sarcoplasm and RNP granule formation, causing severe DCM and ~50% premature mortality in homozygous mice; this demonstrates RNP granules as a driver of cardiomyopathy.","method":"S639G knock-in mouse model, fluorescent immunohistochemistry, RNA-seq, echocardiography, electrocardiography","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knock-in mouse model with multiple outcome measures confirming RNP granule formation and cardiac pathology","pmids":["35041844"],"is_preprint":false},{"year":2022,"finding":"SRPK1, CLK1, and AKT2 all phosphorylate S638 and S640 in the RSRSP stretch of RBM20 in vitro and in vivo, and this phosphorylation regulates RBM20 target gene splicing.","method":"In vitro kinase assays, in vivo studies with kinase overexpression/inhibition, splicing reporter assays","journal":"Genes","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro and in vivo kinase assays with splicing readout, single lab, multiple kinases tested","pmids":["36140694"],"is_preprint":false},{"year":2022,"finding":"Using middle-down mass spectrometry, 16 phosphorylation sites were identified in RBM20, including S638 and S640 in the RSRSP stretch; mutations on these sites regulated splicing and promoted nucleocytoplasmic transport and protein-RNA condensate formation in vitro; phosphomimetic mutations indicated phosphorylation was not the major direct cause of nucleocytoplasmic transport in vitro.","method":"Middle-down mass spectrometry, S637A knock-in mouse, in vitro phosphomimetic mutants, RNA-seq","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mass spectrometry for site identification plus knock-in mouse, single lab","pmids":["35394688"],"is_preprint":false},{"year":2020,"finding":"RBM20 is required for the formation of a subset of titin circRNAs originating from the RBM20-regulated I-band region of the titin transcript; RBM20-null mice completely lack these titin circRNAs; by excluding specific exons from pre-mRNA, RBM20 provides the substrate for this class of circRNAs.","method":"CircRNA profiling of human hearts, RBM20-null mice, cardiac samples from RBM20 mutation carriers","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — RBM20-null mouse model plus human patient cardiac samples, circRNA profiling confirmed mechanism","pmids":["27531932"],"is_preprint":false},{"year":2020,"finding":"RBM20 RRM domain deletion (Rbm20ΔRRM) results in expression of large, supercompliant titin isoforms (N2BAsc) in the heart; partial RBM20 inhibition using this allele reduces titin-based passive stiffness and improves diastolic function in TAC/DOCA heart failure mice, demonstrating the causal role of RBM20-regulated titin isoform switching in diastolic function.","method":"Conditional RRM-deletion mice, TAC/DOCA surgery, echocardiography, pressure-volume analysis, passive stiffness measurements on LV muscle strips","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional in vivo mouse model with multiple functional cardiac readouts","pmids":["27630136"],"is_preprint":false},{"year":2019,"finding":"RBM20 regulates the inclusion of CACNA1C exon 9*, with overexpression promoting exon 9* inclusion and knockdown causing skipping; RBM20 binds introns flanking exon 9* as shown by RNA immunoprecipitation; RBM20 overexpression reduces L-type Ca2+ currents and CaV1.2 membrane surface expression in neonatal rat cardiomyocytes.","method":"RBM20 overexpression and siRNA knockdown in neonatal rat cardiomyocytes, RNA immunoprecipitation, patch-clamp electrophysiology, surface expression assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA immunoprecipitation plus functional electrophysiology, single lab with orthogonal methods","pmids":["31717392"],"is_preprint":false},{"year":2016,"finding":"RBM20 and RBM24 cooperate to promote expression of short ENH splice variants by binding the 5' intronic region of exon 11 of the enh gene; expression of both RBPs is repressed by hypertrophic stimulations.","method":"Co-overexpression splicing assays, RNA binding assay (identification of binding region)","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — splicing reporter assay with binding evidence, single lab","pmids":["27289039"],"is_preprint":false},{"year":2018,"finding":"RBM20 and PTBP1 regulate alternative splicing of FHOD3 by promoting the shift from exon inclusion to exon exclusion; RBM20 targets the FHOD3 transcript, impacting actin filament organization in cardiac tissue.","method":"Splicing assays in cell lines, expression of RBM20 and PTBP1, RT-PCR of FHOD3 variants","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — splicing reporter assays showing functional regulation, single lab","pmids":["30468920"],"is_preprint":false},{"year":2013,"finding":"Sequences necessary for RBM20 full nuclear retention overlap the RNA binding motif (RRM) and the serine-arginine (RS) domain; this nuclear retention signal is conserved in RBM20 orthologs across species.","method":"Cloning of truncated RBM20 expressing vectors, subcellular distribution analysis in transfected cells","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — truncation analysis in transfected cells identifying NLS region, single lab","pmids":["23886709"],"is_preprint":false},{"year":2017,"finding":"Insulin activates the PI3K-Akt-mTOR kinase axis in neonatal rat cardiomyocytes, leading to increased N2B titin isoform expression in an RBM20-dependent manner; inhibition of this axis reduces N2B in NRCMs and in diabetic rats in an RBM20-dependent manner; p70S6K1 knockdown reduces RBM20 levels while 4E-BP1 knockdown elevates them.","method":"Kinase inhibitors, siRNA knockdown (p70S6K1, 4E-BP1), primary neonatal rat cardiomyocytes, diabetic rat model, RT-PCR for titin isoforms","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition and siRNA in cardiomyocytes plus in vivo diabetic model, single lab","pmids":["28676430"],"is_preprint":false},{"year":2019,"finding":"Angiotensin II promotes RBM20 transcription through activation of the MAPK/ELK1 signaling pathway; ELK1 binds the RBM20 promoter and a dual-luciferase assay confirmed Ang II-driven ELK1-mediated RBM20 transcription; increased RBM20 expression then regulates titin and other pre-mRNA splicing targets.","method":"Western blotting (MAPK activation), dual-luciferase promoter assay, primary cardiomyocyte treatment with Ang II/insulin/T3","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dual-luciferase promoter assay for ELK1-RBM20 transcription, western blotting, single lab","pmids":["31614708"],"is_preprint":false},{"year":2021,"finding":"Antisense oligonucleotides (ASOs) targeting RBM20 increase expression of compliant titin isoforms in adult mice and improve cardiac function in a mouse model of increased wall stiffness; ASO treatment also reduced RBM20 to <50% in human engineered heart tissue, resulting in adapted relaxation kinetics.","method":"ASO treatment in adult mice, echocardiography, conductance catheter, RNA-seq, human engineered heart tissue","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo ASO intervention in mouse model plus validation in human engineered heart tissue with functional readouts","pmids":["34851694"],"is_preprint":false},{"year":2020,"finding":"Nuclear localization mutations in the RBM20 RS domain (S637A) cause RBM20 to accumulate in cytoplasmic perinuclear granule-like structures in cardiomyocytes; S637A knock-in mice (mimicking patient mutation) develop severe cardiac dysfunction and spontaneous atrial fibrillation/ventricular arrhythmias; in contrast, frame-shift deletion mutants show less severe phenotypes despite equivalent loss of RBM20-dependent splicing.","method":"S637A knock-in mouse model, immunofluorescence (nuclear vs. cytoplasmic localization), echocardiography, ECG","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — knock-in mouse model with comparison to frame-shift model, multiple functional endpoints, localization confirmed by immunofluorescence","pmids":["33110103"],"is_preprint":false},{"year":2022,"finding":"Adenine base editing (ABE) correction of RBM20 R634Q mutation in human iPSCs achieved 92% editing efficiency, normalizing alternative splicing of cardiac genes, restoring nuclear localization of RBM20, and eliminating cytoplasmic RNP granule formation; systemic AAV delivery of ABE in Rbm20R636Q mice restored cardiac function and extended lifespan.","method":"Adenine base editing in human iPSC-CMs, prime editing in iPSCs, AAV9 delivery in knock-in mice, RNA-seq, echocardiography","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — base editing with functional rescue in iPSC-CMs and in vivo mouse model, multiple orthogonal readouts","pmids":["36417486"],"is_preprint":false},{"year":2020,"finding":"All-trans retinoic acid upregulates RBM20 expression and reverts splicing, calcium handling, and contractility defects in iPSC-CMs with different causal RBM20 mutations, establishing that pharmacological upregulation of RBM20 can rescue haploinsufficiency.","method":"CRISPR/Cas9-engineered iPSC-CMs, all-trans retinoic acid treatment, RNA-seq for splicing, calcium imaging, contractility measurement","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — iPSC-CM model with multiple readouts, single lab","pmids":["32905764"],"is_preprint":false},{"year":2025,"finding":"Reducing cytoplasmic RNP granules via ASO-mediated downregulation of Rbm20 in Rbm20 S639G knock-in mice alleviates DCM without restoring mis-splicing of target genes (including TTN, CAMK2D, RYR2, ANK3), demonstrating that RNP granules are a critical driver of RBM20 cardiomyopathy independent of splicing dysregulation.","method":"ASO treatment in S639G knock-in mice, quantitative immunohistochemistry for RNP granules, echocardiography, RT-PCR for splicing, ECG, Ca2+ release-reuptake kinetics","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo ASO intervention in pathogenic knock-in mouse with granule quantification and multiple functional cardiac readouts","pmids":["40242865"],"is_preprint":false},{"year":2020,"finding":"RBM20 regulates cardiomyopathy-relevant genes such as CaMKIIδ by controlling alternative splicing; in cardiomyocytes with RBM20 loss, aberrant CAMK2D splicing produces an isoform that activates downstream Ca2+ signaling, and loss of RBM20 caused altered expression of titin-binding partners and calcium handling proteins.","method":"Rbm20 knockout rats, gene expression array (Affymetrix), QPCR, western blotting, intracellular Ca2+ measurement in isolated cardiomyocytes","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO rat model with transcriptomics and functional Ca2+ readout, single lab","pmids":["29725258"],"is_preprint":false},{"year":2026,"finding":"CAMK2D is causally involved in RBM20 cardiomyopathy: Rbm20/Camk2d double knockout mice are protected from heart failure and sudden cardiac death; in Rbm20-deficient hearts, CAMK2D target phosphorylation is increased indicating functional CAMK2D overactivation (not only mis-splicing); re-expression of individual CAMK2D splice variants in double KO mice reintroduced cardiac dysfunction; treatment with CAMK2 inhibitor hesperadin improved cardiac function in Rbm20 R636Q knock-in mice.","method":"Double knockout mice (Rbm20/Camk2d), CAMK2D splice variant re-expression, CAMK2 inhibitor hesperadin treatment, phosphoproteomic analysis, echocardiography","journal":"Nature cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (double KO) plus pharmacological rescue in knock-in mice, with phosphoproteomics, multiple orthogonal approaches","pmids":["42082791"],"is_preprint":false},{"year":2020,"finding":"RBM20 nuclear speckles localize to sites of TTN pre-mRNA transcription in muscle nuclei; the ZnF2 domain contributes to splicing repression activity in combination with the RRM and C-terminus domains.","method":"Cell culture splice reporter assay, domain truncation analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional domain analysis in cell culture, single lab","pmids":["29518215"],"is_preprint":false},{"year":2020,"finding":"Structural determination of the RBM20 RRM domain bound to UCUU RNA reveals that the RRM domain spans a larger region than initially proposed; the C-terminal helix (encoded by exon 8) undergoes coupled folding-binding upon interaction with the final uracil of the UCUU motif, and removing this helix reduces both affinity and specificity for the UCUU motif.","method":"NMR structure determination, affinity binding assays, mutagenesis of the C-terminal helix","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with mutagenesis and binding validation, single lab but rigorous structural study","pmids":["32187365"],"is_preprint":false},{"year":2022,"finding":"The skeletal muscle circadian clock regulates titin isoform expression through transcriptional regulation of Rbm20; Bmal1 knockout in skeletal muscle reduces Rbm20 expression, altering titin splicing and sarcomere length heterogeneity; this link was confirmed by environmental circadian disruption which also downregulated Rbm20.","method":"Inducible skeletal muscle-specific Bmal1 KO mice, RNA-seq, liquid chromatography-mass spectrometry, SDS-PAGE for titin isoforms, U7 snRNP-mediated splicing intervention","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO model combined with in vitro snRNP splicing intervention, single lab","pmids":["36047761"],"is_preprint":false},{"year":2023,"finding":"Loss-of-function variants in RBM20 are associated with early-onset atrial fibrillation; in a rat model with loss of RBM20, altered splicing of sarcomere genes (NEXN, TTN, TPM1, MYOM1, LDB3) and differential expression in cardiac genes were demonstrated, along with altered sarcomere and mitochondrial structure and compromised mitochondrial function.","method":"Rat loss-of-function model, electron microscopy, mitochondrial function assays, RNA-seq, splicing activity assay for novel LOF variants","journal":"JACC. Basic to translational science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — rat model with multiple structural and functional readouts, single study","pmids":["38510713"],"is_preprint":false},{"year":2024,"finding":"O-MAP targeting TTN pre-mRNA introns mapped the molecular architecture of a muscle-specific nuclear RNA factory organized around the TTN locus; RBM20 loss remodels nearly every facet of this architecture including cis- and trans-interacting chromosomal domains and the recruitment of RNA-binding and chromatin-scaffolding factors (QKI, SAFB) along with their target transcripts.","method":"Oligonucleotide-mediated proximity-interactome mapping (O-MAP) targeting TTN pre-mRNA, chromatin loci/RNA/protein mapping, genome editing to remove RBM20","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — novel proximity mapping method with genome editing controls, preprint, single lab","pmids":["39574693"],"is_preprint":true},{"year":2025,"finding":"Cytoplasmic mutant RBM20 (S637A) expressed specifically in atria causes spontaneous atrial tachycardia and increased AF inducibility independent of atrial structural remodeling or heart failure; mutant RBM20 in atria causes decreased and mislocalized connexin 43, abnormal Ca2+ handling, and altered phosphorylation of Ca2+-handling proteins—mechanisms independent of splicing regulation.","method":"Atrial-specific mutant RBM20 expression mouse model (SlnCre/+; LSL-Rbm20S637A), ECG, programmed stimulation, immunofluorescence, Ca2+ imaging","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific conditional expression mouse model with multiple cardiac functional readouts, single lab","pmids":["40480405"],"is_preprint":false},{"year":2023,"finding":"Sorafenib inhibits RBM20 expression in rat hearts and human cardiomyocytes; this causes alternative splicing of RBM20 targets SLC25A3 and FHOD3 into fetal isoforms with decreased function; upregulation of RBM20 during sorafenib treatment reversed pathogenic splicing and enhanced mitochondrial phosphate transport by SLC25A3.","method":"Rat heart transcriptomics, human cardiomyocyte treatment, RBM20 overexpression rescue, ATP synthesis assays","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RBM20 overexpression rescue with functional mitochondrial readout, single lab","pmids":["38006979"],"is_preprint":false},{"year":2026,"finding":"A novel truncating RBM20 variant (c.1222DupC) introduces a premature termination codon generating a ~55 kDa truncated protein with complete loss of splicing activity and no dominant-negative effect on wild-type RBM20; the truncated protein localizes to both cytoplasm and nucleus but lacks RS and RRM domains; heterozygous iPSC-CMs show splicing defects in canonical targets (TTN, RYR2, CAMK2D, CACNA1G) and increased calcium transients, consistent with haploinsufficiency.","method":"Splicing reporter assays in HEK293 and neonatal rat cardiomyocytes, heterozygous iPSC-CMs, western blot, RT-PCR, RNA-seq, Ca2+ imaging","journal":"Circulation. Genomic and precision medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — iPSC-CM model with multiple splicing and functional assays, single lab","pmids":["42059065"],"is_preprint":false},{"year":2026,"finding":"RBM20 regulates Tau exon 6 and exon 10 alternative splicing as demonstrated by RNA-binding assays and qPCR in cell lines and neuronal organoids.","method":"RNA-binding assay, qPCR, cerebral organoid differentiation","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single binding assay and qPCR, no mechanistic follow-up; extends RBM20 function beyond cardiac context","pmids":["42123583"],"is_preprint":false}],"current_model":"RBM20 is a vertebrate- and muscle-specific serine-arginine-rich (SR) splicing factor that represses exon inclusion by binding UCUU motifs (via its RRM domain with coupled folding-binding) predominantly in intronic regions flanking alternative exons, stalling the spliceosome at complex A through interactions with U1 and U2 snRNPs; its nuclear localization is mediated by Transportin-3 (TNPO3) through the RS/RSRSP domain, which is constitutively phosphorylated by SR kinases (SRPK1, CLK1, AKT2); pathogenic missense variants in the RSRSP stretch disrupt TNPO3 binding and nuclear import, causing cytoplasmic mislocalization and the formation of liquid-like pathogenic RNP granules that independently drive dilated cardiomyopathy beyond splicing loss; in the nucleus, RBM20 organizes a trans-interacting chromatin domain 'splicing factory' around the TTN locus that co-regulates CACNA1C, CAMK2D, and other cardiac gene transcripts; downstream, aberrant CAMK2D splicing and functional CAMK2D overactivation are central mediators of RBM20 cardiomyopathy heart failure and arrhythmia, and therapeutic strategies including ASO-mediated RBM20 downregulation, adenine base editing, and CAMK2D inhibition have been validated in animal models."},"narrative":{"mechanistic_narrative":"RBM20 is a muscle-specific RNA-binding splicing repressor that governs a cardiac alternative-splicing program centered on titin (TTN) and roughly 30 other heart genes, with loss-of-function causing pathological titin isoform shifts and dilated cardiomyopathy [PMID:22466703]. It represses exon inclusion by binding UCUU elements predominantly in introns flanking alternative exons, where its RRM domain—extended by a C-terminal helix that undergoes coupled folding-binding upon engaging the final uracil—confers affinity and specificity for the motif [PMID:32187365], while the RRM, ZnF2, and C-terminus together are necessary and sufficient for repressor activity [PMID:29518215]. RBM20 stalls the spliceosome at complex A through interactions with U1 and U2 snRNPs, and assembles on nascent TTN pre-mRNA into nuclear foci [PMID:24960161, PMID:23307558]. These foci nucleate a cardiac trans-interacting chromatin domain or 'splicing factory' that brings the TTN locus into spatial proximity with other RBM20 targets including CACNA1C and CAMK2D to co-regulate their splicing [PMID:30948719]. Beyond titin, RBM20 controls isoform switching of CAMK2D/CaMKIIδ, CACNA1C, FHOD3, and ENH, and supplies the substrate for a class of titin circular RNAs [PMID:29650543, PMID:27531932, PMID:31717392, PMID:30468920]. Nuclear import of RBM20 is mediated by Transportin-3 (TNPO3) via the RS/RSRSP domain, whose serine residues are constitutively phosphorylated by SRPK1, CLK1, and AKT2 [PMID:37463913, PMID:29895960, PMID:36140694]. Pathogenic missense variants in the RSRSP stretch disrupt TNPO3 binding and nuclear import, driving cytoplasmic mislocalization and the formation of liquid-like RNP granules that fuse with stress granules and drive cardiomyopathy independently of splicing loss [PMID:37463913, PMID:33188278, PMID:37219949]. Aberrant CAMK2D splicing and functional CAMK2D overactivation are central mediators of the resulting heart failure and arrhythmia [PMID:42082791], and ASO-mediated RBM20 downregulation, adenine base editing, and CAMK2 inhibition rescue disease in animal models [PMID:34851694, PMID:36417486, PMID:42082791, PMID:40242865].","teleology":[{"year":2012,"claim":"Established RBM20 as a disease gene by showing its loss disrupts titin splicing, defining the first molecular function for the protein.","evidence":"Positional cloning and cardiac transcriptome deep sequencing in a mutant rat strain, confirmed in human","pmids":["22466703"],"confidence":"High","gaps":["Did not define the RNA motif or binding mechanism","Did not establish how splicing regulation translates to cardiomyopathy"]},{"year":2013,"claim":"Showed RBM20 represses splicing by binding titin pre-mRNA and forms nuclear speckles on partially processed transcripts, beginning to localize its mechanism of action.","evidence":"RNA binding assays, immunofluorescence, splicing reporters, and knockout rat","pmids":["23307558","23886709"],"confidence":"High","gaps":["Spliceosomal partners not yet identified","Genome-wide binding map absent"]},{"year":2014,"claim":"Defined the UCUU recognition motif and the step of spliceosome inhibition, explaining how RBM20 represses exon inclusion at the molecular level.","evidence":"Transcriptome-wide CLIP-seq, RNA-seq, and quantitative proteomics identifying U1/U2 snRNP interaction","pmids":["24960161"],"confidence":"High","gaps":["Structural basis of UCUU recognition unresolved","Mechanism of complex A stalling not detailed"]},{"year":2016,"claim":"Connected RBM20 splicing to functional outputs by showing it generates titin circRNAs and tuning titin compliance, broadening its target repertoire.","evidence":"CircRNA profiling and RRM-deletion mice with passive stiffness measurements","pmids":["27531932","27630136","27289039"],"confidence":"High","gaps":["Functional role of titin circRNAs unclear","Cooperative regulation with other RBPs incompletely mapped"]},{"year":2018,"claim":"Identified CAMK2D mis-splicing and calcium handling defects as a downstream consequence linking RBM20 loss to arrhythmia, and mapped the domain requirements for repression.","evidence":"Knockout mice/rats, patch-clamp electrophysiology, Ca2+ imaging, pharmacological rescue, and truncation/domain analysis","pmids":["29650543","29518215","29725258","30468920"],"confidence":"High","gaps":["Causal sufficiency of CAMK2D not yet tested genetically","RS-domain contribution to phenotype not separated from splicing loss"]},{"year":2018,"claim":"Established that RSRSP-stretch phosphorylation is constitutive and that disrupting this region impairs nuclear localization and causes DCM, shifting attention from splicing loss toward localization.","evidence":"Phospho-antibody staining and S637A knock-in mouse with titin isoform analysis","pmids":["29895960"],"confidence":"High","gaps":["Importer mediating nuclear entry not identified","Mechanism of phosphorylation control of import unclear"]},{"year":2019,"claim":"Revealed a 3D-genome 'splicing factory' nucleated by TTN pre-mRNA that spatially organizes multiple RBM20 targets, providing a higher-order organizational principle for its regulation.","evidence":"Hi-C, RNA-seq, ATAC-seq, and CRISPR editing in iPSC-derived cardiomyocytes","pmids":["30948719","31717392","31614708"],"confidence":"High","gaps":["Protein scaffolds organizing the factory not fully defined","Causality of chromatin proximity for splicing efficiency partial"]},{"year":2020,"claim":"Demonstrated that pathogenic variants produce gain-of-function cytoplasmic RNP granules with liquid-like properties, identifying a splicing-independent disease mechanism.","evidence":"Gene-edited pigs, patient iPSC-CMs, eCLIP, super-resolution microscopy, and condensate biochemistry","pmids":["33188278","34732726","33110103"],"confidence":"High","gaps":["Granule composition and toxicity mechanism incomplete","Relative contribution of granules vs splicing loss not yet dissected in vivo"]},{"year":2020,"claim":"Solved the RRM–UCUU structure showing coupled folding-binding of a C-terminal helix, explaining motif specificity at atomic resolution.","evidence":"NMR structure determination with affinity assays and helix mutagenesis","pmids":["32187365","29518215"],"confidence":"High","gaps":["Structure of RBM20 engaged with spliceosome unknown","Higher-order RNA clustering geometry undefined"]},{"year":2020,"claim":"Showed RBM20 expression is tunable by circadian and pharmacological inputs, including retinoic acid rescue of haploinsufficiency, opening expression-based therapeutic strategies.","evidence":"Bmal1 KO mice, iPSC-CMs with retinoic acid treatment, splicing and contractility readouts","pmids":["32905764","36047761","28676430"],"confidence":"Medium","gaps":["Direct transcriptional control circuitry partial","Translatability of retinoic acid rescue unconfirmed"]},{"year":2022,"claim":"Genetically separated RS-domain-dependent localization from RRM-dependent splicing, establishing mislocalization/granule formation as the critical driver of severe DCM.","evidence":"RS-deletion vs RRM-deletion mouse models and S639G knock-in mice with echocardiography and RNA-seq","pmids":["37219949","35041844"],"confidence":"High","gaps":["Molecular toxicity of cytoplasmic granules not fully resolved","Why frame-shift mutants are milder than RS mutants not fully explained"]},{"year":2022,"claim":"Identified SRPK1, CLK1, and AKT2 as RSRSP-stretch kinases regulating target splicing, and catalogued RBM20 phosphosites controlling transport and condensation.","evidence":"In vitro/in vivo kinase assays, middle-down mass spectrometry, phosphomimetic mutants, and splicing reporters","pmids":["36140694","35394688"],"confidence":"Medium","gaps":["Single-lab kinase findings","Whether phosphorylation directly gates transport unresolved (phosphomimetics not sufficient in vitro)"]},{"year":2022,"claim":"Validated therapeutic RBM20 reduction by ASO and correction by adenine base editing, demonstrating that restoring localization and splicing rescues cardiac function.","evidence":"ASO in mice and engineered human heart tissue; adenine base editing in iPSC-CMs and AAV delivery in knock-in mice","pmids":["34851694","36417486"],"confidence":"High","gaps":["Long-term safety and off-target effects of base editing unaddressed","Optimal therapeutic window for RBM20 dosing undefined"]},{"year":2023,"claim":"Extended RBM20 phenotypes to atrial fibrillation and mitochondrial/structural defects, and linked drug-induced RBM20 suppression to pathogenic fetal isoform switching.","evidence":"Rat LOF model with electron microscopy and mitochondrial assays; sorafenib treatment with RBM20 rescue and ATP synthesis assays","pmids":["38510713","38006979"],"confidence":"Medium","gaps":["Mechanism linking RBM20 to mitochondrial structure incomplete","Single-lab observations"]},{"year":2024,"claim":"Mapped the protein and chromatin architecture of the TTN-centered RNA factory and showed RBM20 loss remodels its scaffolding factors, deepening the splicing-factory model.","evidence":"O-MAP proximity interactome mapping with genome editing (preprint)","pmids":["39574693"],"confidence":"Medium","gaps":["Preprint, single lab","Functional roles of recruited factors QKI/SAFB not established"]},{"year":2025,"claim":"Demonstrated that reducing cytoplasmic RNP granules alleviates DCM without restoring target splicing, and that atrial cytoplasmic mutant RBM20 drives arrhythmia independently of splicing, cementing granule toxicity as a splicing-independent disease mechanism.","evidence":"ASO in S639G knock-in mice with granule quantification; atrial-specific mutant RBM20 mouse with ECG and Ca2+ imaging","pmids":["40242865","40480405"],"confidence":"High","gaps":["Precise biochemical mechanism of granule-driven dysfunction unresolved","Connexin 43 mislocalization mechanism incomplete"]},{"year":2026,"claim":"Established CAMK2D as causally required for RBM20 cardiomyopathy through genetic epistasis and pharmacological rescue, identifying functional CAMK2D overactivation as a key downstream effector.","evidence":"Rbm20/Camk2d double-knockout mice, splice-variant re-expression, hesperadin treatment, and phosphoproteomics","pmids":["42082791","42059065"],"confidence":"High","gaps":["Relative weighting of CAMK2D vs titin/granule pathways unclear","Translatability of CAMK2 inhibition to patients untested"]},{"year":null,"claim":"How the relative contributions of splicing loss, RNP-granule toxicity, and CAMK2D overactivation combine to produce specific cardiac phenotypes, and whether RBM20 functions outside cardiac/skeletal muscle, remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["Quantitative dissection of parallel disease mechanisms lacking","Non-cardiac roles (e.g., Tau splicing) only weakly evidenced"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1,2,5,30]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[1,2]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,8,19]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[2,6,29]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7,9,10,23]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,2]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,21]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[0,15]}],"complexes":["TTN-locus splicing factory / trans-interacting chromatin domain"],"partners":["TNPO3","SRPK1","CLK1","AKT2","PTBP1","RBM24"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q5T481","full_name":"RNA-binding protein 20","aliases":["RNA-binding motif protein 20"],"length_aa":1227,"mass_kda":134.3,"function":"RNA-binding protein that acts as a regulator of mRNA splicing of a subset of genes encoding key structural proteins involved in cardiac development, such as TTN (Titin), CACNA1C, CAMK2D or PDLIM5/ENH (PubMed:22466703, PubMed:24960161, PubMed:26604136, PubMed:27496873, PubMed:27531932, PubMed:29895960, PubMed:30948719, PubMed:32840935, PubMed:34732726, PubMed:35427468). Acts as a repressor of mRNA splicing: specifically binds the 5'UCUU-3' motif that is predominantly found within intronic sequences of pre-mRNAs, leading to the exclusion of specific exons in target transcripts (PubMed:24960161, PubMed:30948719, PubMed:34732726). RBM20-mediated exon skipping is hormone-dependent and is essential for TTN isoform transition in both cardiac and skeletal muscles (PubMed:27531932, PubMed:30948719). RBM20-mediated exon skipping of TTN provides substrates for the formation of circular RNA (circRNAs) from the TTN transcripts (PubMed:27531932, PubMed:34732726). Together with RBM24, promotes the expression of short isoforms of PDLIM5/ENH in cardiomyocytes (By similarity)","subcellular_location":"Nucleus; Cytoplasm, Cytoplasmic ribonucleoprotein granule","url":"https://www.uniprot.org/uniprotkb/Q5T481/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RBM20","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RBM20","total_profiled":1310},"omim":[{"mim_id":"613172","title":"CARDIOMYOPATHY, DILATED, 1DD; CMD1DD","url":"https://www.omim.org/entry/613172"},{"mim_id":"613171","title":"RNA-BINDING MOTIF PROTEIN 20; RBM20","url":"https://www.omim.org/entry/613171"},{"mim_id":"115200","title":"CARDIOMYOPATHY, DILATED, 1A; CMD1A","url":"https://www.omim.org/entry/115200"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Cytokinetic bridge","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"heart muscle","ntpm":38.2},{"tissue":"pancreas","ntpm":18.7}],"url":"https://www.proteinatlas.org/search/RBM20"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q5T481","domains":[{"cath_id":"-","chopping":"397-447","consensus_level":"high","plddt":86.4247,"start":397,"end":447},{"cath_id":"3.30.70.330","chopping":"520-611","consensus_level":"high","plddt":87.4282,"start":520,"end":611},{"cath_id":"-","chopping":"1150-1198","consensus_level":"high","plddt":88.5824,"start":1150,"end":1198}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5T481","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q5T481-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q5T481-F1-predicted_aligned_error_v6.png","plddt_mean":48.16},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RBM20","jax_strain_url":"https://www.jax.org/strain/search?query=RBM20"},"sequence":{"accession":"Q5T481","fasta_url":"https://rest.uniprot.org/uniprotkb/Q5T481.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q5T481/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5T481"}},"corpus_meta":[{"pmid":"22466703","id":"PMC_22466703","title":"RBM20, a gene for hereditary cardiomyopathy, regulates titin splicing.","date":"2012","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/22466703","citation_count":480,"is_preprint":false},{"pmid":"27531932","id":"PMC_27531932","title":"RBM20 Regulates Circular RNA Production From the Titin Gene.","date":"2016","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/27531932","citation_count":245,"is_preprint":false},{"pmid":"29650543","id":"PMC_29650543","title":"RBM20 Mutations Induce an Arrhythmogenic Dilated Cardiomyopathy Related to Disturbed Calcium Handling.","date":"2018","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/29650543","citation_count":189,"is_preprint":false},{"pmid":"24960161","id":"PMC_24960161","title":"RNA-binding protein RBM20 represses splicing to orchestrate cardiac pre-mRNA processing.","date":"2014","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/24960161","citation_count":186,"is_preprint":false},{"pmid":"20590677","id":"PMC_20590677","title":"Identification of novel mutations in RBM20 in patients with dilated cardiomyopathy.","date":"2010","source":"Clinical and translational science","url":"https://pubmed.ncbi.nlm.nih.gov/20590677","citation_count":152,"is_preprint":false},{"pmid":"22004663","id":"PMC_22004663","title":"Genetic variation in the alternative splicing regulator RBM20 is associated with dilated cardiomyopathy.","date":"2011","source":"Heart rhythm","url":"https://pubmed.ncbi.nlm.nih.gov/22004663","citation_count":139,"is_preprint":false},{"pmid":"36417486","id":"PMC_36417486","title":"Precise genomic editing of pathogenic mutations in RBM20 rescues dilated cardiomyopathy.","date":"2022","source":"Science translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36417486","citation_count":130,"is_preprint":false},{"pmid":"30948719","id":"PMC_30948719","title":"Dynamics of genome reorganization during human cardiogenesis reveal an RBM20-dependent splicing factory.","date":"2019","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/30948719","citation_count":125,"is_preprint":false},{"pmid":"30871351","id":"PMC_30871351","title":"Regional Variation in RBM20 Causes a Highly Penetrant Arrhythmogenic Cardiomyopathy.","date":"2019","source":"Circulation. 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RBM20 regulates alternative splicing of titin (TTN) and approximately 30 other cardiac genes conserved between humans and rats, identified by positional cloning in a rat strain with altered titin mRNA splicing and confirmed by deep sequencing of the cardiac transcriptome.\",\n      \"method\": \"Positional cloning, deep RNA sequencing (transcriptome), loss-of-function rat model\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — positional cloning plus transcriptome-wide sequencing in both rat and human, replicated across species, foundational study\",\n      \"pmids\": [\"22466703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RBM20 acts as a splicing repressor by binding predominantly within intronic regions near 3' and 5' splice sites via a distinct RNA-recognition element (UCUU motif); RBM20 interacts with U1 and U2 snRNPs and represses splicing by stalling the spliceosome at complex A.\",\n      \"method\": \"Transcriptome-wide CLIP-seq, RNA-seq, quantitative proteomics (mass spectrometry), cell culture and rat/human hearts\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — CLIP-seq defining binding sites, proteomics identifying spliceosome interaction (U1/U2 snRNPs), multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"24960161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RBM20 mediates titin exon skipping by binding to titin pre-mRNA to repress splicing of specific regions; RBM20 nuclear speckles are aggregates of RBM20 protein on partially processed titin pre-mRNAs; RBM20 also mediates intron retention and exon shuffling; cooperative repression and alternative 3' splice site selection are used to skip different subsets of titin exons.\",\n      \"method\": \"RNA binding assays, immunofluorescence, splicing reporter assays, knockout rat model\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (binding assays, immunofluorescence, KO model) replicated mechanistic findings\",\n      \"pmids\": [\"23307558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Phosphorylation of the two serine residues in the RSRSP stretch of RBM20 (S638 and S640 in rats) is constitutive; mutations in this stretch disrupt nuclear localization of RBM20; the RSRSP stretch functions as a critical part of a nuclear localization signal, and S637A knock-in mice display titin isoform changes and DCM-like phenotype.\",\n      \"method\": \"Phospho-antibody staining, knock-in mouse model (Rbm20 S637A), titin isoform analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knock-in model plus phosphorylation characterization with multiple methods\",\n      \"pmids\": [\"29895960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Loss of RBM20 causes aberrant splicing of CaMKIIδ, shifting expression toward the δ-A isoform that activates L-type Ca2+ current (ICa,L), resulting in increased ICa,L, intracellular Ca2+ overload, increased sarcoplasmic reticulum Ca2+ content, and spontaneous Ca2+ releases; verapamil (ICa,L antagonist) attenuated these proarrhythmic effects.\",\n      \"method\": \"Rbm20 knockout mice, cellular electrophysiology patch-clamp, intracellular Ca2+ measurements, pharmacological rescue\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct electrophysiology and Ca2+ measurements in KO cardiomyocytes with pharmacological rescue, multiple orthogonal methods\",\n      \"pmids\": [\"29650543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The RRM domain and C-terminus of RBM20 are necessary and sufficient for splicing repressor activity; the ZnF2 domain is important for splicing repression; RBM20 binds titin pre-mRNA clusters through the RRM domain and represses upstream and downstream introns; PTB4 is a novel titin splice regulator that counteracts RBM20 repressor activity.\",\n      \"method\": \"Tissue culture splice reporter assay, in vitro RNA binding assay, truncation mutants\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding and functional splice reporter assays with domain mutagenesis, single lab\",\n      \"pmids\": [\"29518215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TTN pre-mRNA nucleates RBM20 foci in the nucleus that drive spatial proximity between the TTN locus and other inter-chromosomal RBM20 targets (CACNA1C, CAMK2D), forming a cardiac-specific trans-interacting chromatin domain (TID) functioning as a splicing factory; genome editing studies confirmed this mechanism promotes RBM20-dependent alternative splicing.\",\n      \"method\": \"Hi-C, RNA-seq, ATAC-seq, genome editing (CRISPR), iPSC-derived cardiomyocytes\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Hi-C 3D genome mapping combined with genome editing functional validation and multiple omics methods\",\n      \"pmids\": [\"30948719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RBM20 R636S pathogenic variant causes accumulation of dysregulated RNP granules with liquid-like material properties in the sarcoplasm of cardiomyocytes; these granules dock at spaced intervals along cytoskeletal elements, promote phase partitioning of cardiac biomolecules, and fuse with stress granules; confirmed in gene-edited pigs and patient myocardium.\",\n      \"method\": \"RBM20 gene-edited pigs (R636S homozygous), iPSC-derived cardiomyocytes from patients, live-cell imaging, biochemical analysis of condensates\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — large animal model plus human patient iPSC-CMs, multiple methods confirming RNP granule formation and material properties\",\n      \"pmids\": [\"33188278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RBM20 nuclear localization is mediated by Transportin-3 (TNPO3) as the main nuclear importer; the direct RBM20–TNPO3 interaction involves the RS domain and is disrupted by pathogenic variants; mislocalized RS-domain mutants retain splice regulatory activity, indicating aberrant cytoplasmic localization (not loss of splicing activity) is the main driver of pathological phenotype; relocalization of mutant RBM20 to nucleus restores splicing and dissolves cytoplasmic granules.\",\n      \"method\": \"Genome-wide CRISPR knockout screen with image-enabled cell sorting, Co-IP/pulldown (RBM20–TNPO3 interaction), cell culture and animal model rescue experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide CRISPR screen to identify importer, direct interaction validated, functional rescue in cell culture and animal models, multiple orthogonal methods\",\n      \"pmids\": [\"37463913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DCM-associated missense mutations in RBM20 (e.g., R636S) cause gain-of-function: mutant RBM20 shifts RNA binding preference to 3' UTR sequences shared with ALS-associated RBPs (FUS, DDX6); mutant RBM20 localizes to cytoplasmic processing bodies (DDX6+) under basal conditions and to stress granules (G3BP1+) under acute stress; these mutations produce unique splicing, polyadenylation, and circular RNA defects distinct from KO.\",\n      \"method\": \"eCLIP, deep RNA-seq, super-resolution microscopy, isogenic iPSC lines with missense mutations and KO, engineered heart tissues\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — eCLIP for direct RNA binding, super-resolution microscopy for localization, isogenic comparison of missense vs. KO with multiple omics methods\",\n      \"pmids\": [\"34732726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Disruption of the RS domain (nuclear localization signal) is causative for DCM; Rbm20ΔRS mice develop DCM with RBM20 mislocalization to sarcoplasm and granule formation similar to pathogenic mutation knock-in animals; in contrast, mice lacking the RRM domain show mis-splicing but no DCM and no granule formation, establishing that RS domain-mediated nuclear localization (not splicing loss per se) is the critical mechanism for severe DCM.\",\n      \"method\": \"RS domain deletion knock-in mouse model, RRM deletion mouse model, immunocytochemistry, echocardiography, RNA-seq\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two genetically distinct mouse models with direct comparison, defining domain-specific contributions to localization vs. splicing\",\n      \"pmids\": [\"37219949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RBM20 S639G mutation promotes RBM20 trafficking to sarcoplasm and RNP granule formation, causing severe DCM and ~50% premature mortality in homozygous mice; this demonstrates RNP granules as a driver of cardiomyopathy.\",\n      \"method\": \"S639G knock-in mouse model, fluorescent immunohistochemistry, RNA-seq, echocardiography, electrocardiography\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knock-in mouse model with multiple outcome measures confirming RNP granule formation and cardiac pathology\",\n      \"pmids\": [\"35041844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SRPK1, CLK1, and AKT2 all phosphorylate S638 and S640 in the RSRSP stretch of RBM20 in vitro and in vivo, and this phosphorylation regulates RBM20 target gene splicing.\",\n      \"method\": \"In vitro kinase assays, in vivo studies with kinase overexpression/inhibition, splicing reporter assays\",\n      \"journal\": \"Genes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro and in vivo kinase assays with splicing readout, single lab, multiple kinases tested\",\n      \"pmids\": [\"36140694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Using middle-down mass spectrometry, 16 phosphorylation sites were identified in RBM20, including S638 and S640 in the RSRSP stretch; mutations on these sites regulated splicing and promoted nucleocytoplasmic transport and protein-RNA condensate formation in vitro; phosphomimetic mutations indicated phosphorylation was not the major direct cause of nucleocytoplasmic transport in vitro.\",\n      \"method\": \"Middle-down mass spectrometry, S637A knock-in mouse, in vitro phosphomimetic mutants, RNA-seq\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mass spectrometry for site identification plus knock-in mouse, single lab\",\n      \"pmids\": [\"35394688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RBM20 is required for the formation of a subset of titin circRNAs originating from the RBM20-regulated I-band region of the titin transcript; RBM20-null mice completely lack these titin circRNAs; by excluding specific exons from pre-mRNA, RBM20 provides the substrate for this class of circRNAs.\",\n      \"method\": \"CircRNA profiling of human hearts, RBM20-null mice, cardiac samples from RBM20 mutation carriers\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RBM20-null mouse model plus human patient cardiac samples, circRNA profiling confirmed mechanism\",\n      \"pmids\": [\"27531932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RBM20 RRM domain deletion (Rbm20ΔRRM) results in expression of large, supercompliant titin isoforms (N2BAsc) in the heart; partial RBM20 inhibition using this allele reduces titin-based passive stiffness and improves diastolic function in TAC/DOCA heart failure mice, demonstrating the causal role of RBM20-regulated titin isoform switching in diastolic function.\",\n      \"method\": \"Conditional RRM-deletion mice, TAC/DOCA surgery, echocardiography, pressure-volume analysis, passive stiffness measurements on LV muscle strips\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional in vivo mouse model with multiple functional cardiac readouts\",\n      \"pmids\": [\"27630136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RBM20 regulates the inclusion of CACNA1C exon 9*, with overexpression promoting exon 9* inclusion and knockdown causing skipping; RBM20 binds introns flanking exon 9* as shown by RNA immunoprecipitation; RBM20 overexpression reduces L-type Ca2+ currents and CaV1.2 membrane surface expression in neonatal rat cardiomyocytes.\",\n      \"method\": \"RBM20 overexpression and siRNA knockdown in neonatal rat cardiomyocytes, RNA immunoprecipitation, patch-clamp electrophysiology, surface expression assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA immunoprecipitation plus functional electrophysiology, single lab with orthogonal methods\",\n      \"pmids\": [\"31717392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RBM20 and RBM24 cooperate to promote expression of short ENH splice variants by binding the 5' intronic region of exon 11 of the enh gene; expression of both RBPs is repressed by hypertrophic stimulations.\",\n      \"method\": \"Co-overexpression splicing assays, RNA binding assay (identification of binding region)\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — splicing reporter assay with binding evidence, single lab\",\n      \"pmids\": [\"27289039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RBM20 and PTBP1 regulate alternative splicing of FHOD3 by promoting the shift from exon inclusion to exon exclusion; RBM20 targets the FHOD3 transcript, impacting actin filament organization in cardiac tissue.\",\n      \"method\": \"Splicing assays in cell lines, expression of RBM20 and PTBP1, RT-PCR of FHOD3 variants\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — splicing reporter assays showing functional regulation, single lab\",\n      \"pmids\": [\"30468920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Sequences necessary for RBM20 full nuclear retention overlap the RNA binding motif (RRM) and the serine-arginine (RS) domain; this nuclear retention signal is conserved in RBM20 orthologs across species.\",\n      \"method\": \"Cloning of truncated RBM20 expressing vectors, subcellular distribution analysis in transfected cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — truncation analysis in transfected cells identifying NLS region, single lab\",\n      \"pmids\": [\"23886709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Insulin activates the PI3K-Akt-mTOR kinase axis in neonatal rat cardiomyocytes, leading to increased N2B titin isoform expression in an RBM20-dependent manner; inhibition of this axis reduces N2B in NRCMs and in diabetic rats in an RBM20-dependent manner; p70S6K1 knockdown reduces RBM20 levels while 4E-BP1 knockdown elevates them.\",\n      \"method\": \"Kinase inhibitors, siRNA knockdown (p70S6K1, 4E-BP1), primary neonatal rat cardiomyocytes, diabetic rat model, RT-PCR for titin isoforms\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition and siRNA in cardiomyocytes plus in vivo diabetic model, single lab\",\n      \"pmids\": [\"28676430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Angiotensin II promotes RBM20 transcription through activation of the MAPK/ELK1 signaling pathway; ELK1 binds the RBM20 promoter and a dual-luciferase assay confirmed Ang II-driven ELK1-mediated RBM20 transcription; increased RBM20 expression then regulates titin and other pre-mRNA splicing targets.\",\n      \"method\": \"Western blotting (MAPK activation), dual-luciferase promoter assay, primary cardiomyocyte treatment with Ang II/insulin/T3\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dual-luciferase promoter assay for ELK1-RBM20 transcription, western blotting, single lab\",\n      \"pmids\": [\"31614708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Antisense oligonucleotides (ASOs) targeting RBM20 increase expression of compliant titin isoforms in adult mice and improve cardiac function in a mouse model of increased wall stiffness; ASO treatment also reduced RBM20 to <50% in human engineered heart tissue, resulting in adapted relaxation kinetics.\",\n      \"method\": \"ASO treatment in adult mice, echocardiography, conductance catheter, RNA-seq, human engineered heart tissue\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo ASO intervention in mouse model plus validation in human engineered heart tissue with functional readouts\",\n      \"pmids\": [\"34851694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Nuclear localization mutations in the RBM20 RS domain (S637A) cause RBM20 to accumulate in cytoplasmic perinuclear granule-like structures in cardiomyocytes; S637A knock-in mice (mimicking patient mutation) develop severe cardiac dysfunction and spontaneous atrial fibrillation/ventricular arrhythmias; in contrast, frame-shift deletion mutants show less severe phenotypes despite equivalent loss of RBM20-dependent splicing.\",\n      \"method\": \"S637A knock-in mouse model, immunofluorescence (nuclear vs. cytoplasmic localization), echocardiography, ECG\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knock-in mouse model with comparison to frame-shift model, multiple functional endpoints, localization confirmed by immunofluorescence\",\n      \"pmids\": [\"33110103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Adenine base editing (ABE) correction of RBM20 R634Q mutation in human iPSCs achieved 92% editing efficiency, normalizing alternative splicing of cardiac genes, restoring nuclear localization of RBM20, and eliminating cytoplasmic RNP granule formation; systemic AAV delivery of ABE in Rbm20R636Q mice restored cardiac function and extended lifespan.\",\n      \"method\": \"Adenine base editing in human iPSC-CMs, prime editing in iPSCs, AAV9 delivery in knock-in mice, RNA-seq, echocardiography\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — base editing with functional rescue in iPSC-CMs and in vivo mouse model, multiple orthogonal readouts\",\n      \"pmids\": [\"36417486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"All-trans retinoic acid upregulates RBM20 expression and reverts splicing, calcium handling, and contractility defects in iPSC-CMs with different causal RBM20 mutations, establishing that pharmacological upregulation of RBM20 can rescue haploinsufficiency.\",\n      \"method\": \"CRISPR/Cas9-engineered iPSC-CMs, all-trans retinoic acid treatment, RNA-seq for splicing, calcium imaging, contractility measurement\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — iPSC-CM model with multiple readouts, single lab\",\n      \"pmids\": [\"32905764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Reducing cytoplasmic RNP granules via ASO-mediated downregulation of Rbm20 in Rbm20 S639G knock-in mice alleviates DCM without restoring mis-splicing of target genes (including TTN, CAMK2D, RYR2, ANK3), demonstrating that RNP granules are a critical driver of RBM20 cardiomyopathy independent of splicing dysregulation.\",\n      \"method\": \"ASO treatment in S639G knock-in mice, quantitative immunohistochemistry for RNP granules, echocardiography, RT-PCR for splicing, ECG, Ca2+ release-reuptake kinetics\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo ASO intervention in pathogenic knock-in mouse with granule quantification and multiple functional cardiac readouts\",\n      \"pmids\": [\"40242865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RBM20 regulates cardiomyopathy-relevant genes such as CaMKIIδ by controlling alternative splicing; in cardiomyocytes with RBM20 loss, aberrant CAMK2D splicing produces an isoform that activates downstream Ca2+ signaling, and loss of RBM20 caused altered expression of titin-binding partners and calcium handling proteins.\",\n      \"method\": \"Rbm20 knockout rats, gene expression array (Affymetrix), QPCR, western blotting, intracellular Ca2+ measurement in isolated cardiomyocytes\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO rat model with transcriptomics and functional Ca2+ readout, single lab\",\n      \"pmids\": [\"29725258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CAMK2D is causally involved in RBM20 cardiomyopathy: Rbm20/Camk2d double knockout mice are protected from heart failure and sudden cardiac death; in Rbm20-deficient hearts, CAMK2D target phosphorylation is increased indicating functional CAMK2D overactivation (not only mis-splicing); re-expression of individual CAMK2D splice variants in double KO mice reintroduced cardiac dysfunction; treatment with CAMK2 inhibitor hesperadin improved cardiac function in Rbm20 R636Q knock-in mice.\",\n      \"method\": \"Double knockout mice (Rbm20/Camk2d), CAMK2D splice variant re-expression, CAMK2 inhibitor hesperadin treatment, phosphoproteomic analysis, echocardiography\",\n      \"journal\": \"Nature cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (double KO) plus pharmacological rescue in knock-in mice, with phosphoproteomics, multiple orthogonal approaches\",\n      \"pmids\": [\"42082791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RBM20 nuclear speckles localize to sites of TTN pre-mRNA transcription in muscle nuclei; the ZnF2 domain contributes to splicing repression activity in combination with the RRM and C-terminus domains.\",\n      \"method\": \"Cell culture splice reporter assay, domain truncation analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional domain analysis in cell culture, single lab\",\n      \"pmids\": [\"29518215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Structural determination of the RBM20 RRM domain bound to UCUU RNA reveals that the RRM domain spans a larger region than initially proposed; the C-terminal helix (encoded by exon 8) undergoes coupled folding-binding upon interaction with the final uracil of the UCUU motif, and removing this helix reduces both affinity and specificity for the UCUU motif.\",\n      \"method\": \"NMR structure determination, affinity binding assays, mutagenesis of the C-terminal helix\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with mutagenesis and binding validation, single lab but rigorous structural study\",\n      \"pmids\": [\"32187365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The skeletal muscle circadian clock regulates titin isoform expression through transcriptional regulation of Rbm20; Bmal1 knockout in skeletal muscle reduces Rbm20 expression, altering titin splicing and sarcomere length heterogeneity; this link was confirmed by environmental circadian disruption which also downregulated Rbm20.\",\n      \"method\": \"Inducible skeletal muscle-specific Bmal1 KO mice, RNA-seq, liquid chromatography-mass spectrometry, SDS-PAGE for titin isoforms, U7 snRNP-mediated splicing intervention\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model combined with in vitro snRNP splicing intervention, single lab\",\n      \"pmids\": [\"36047761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss-of-function variants in RBM20 are associated with early-onset atrial fibrillation; in a rat model with loss of RBM20, altered splicing of sarcomere genes (NEXN, TTN, TPM1, MYOM1, LDB3) and differential expression in cardiac genes were demonstrated, along with altered sarcomere and mitochondrial structure and compromised mitochondrial function.\",\n      \"method\": \"Rat loss-of-function model, electron microscopy, mitochondrial function assays, RNA-seq, splicing activity assay for novel LOF variants\",\n      \"journal\": \"JACC. Basic to translational science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rat model with multiple structural and functional readouts, single study\",\n      \"pmids\": [\"38510713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"O-MAP targeting TTN pre-mRNA introns mapped the molecular architecture of a muscle-specific nuclear RNA factory organized around the TTN locus; RBM20 loss remodels nearly every facet of this architecture including cis- and trans-interacting chromosomal domains and the recruitment of RNA-binding and chromatin-scaffolding factors (QKI, SAFB) along with their target transcripts.\",\n      \"method\": \"Oligonucleotide-mediated proximity-interactome mapping (O-MAP) targeting TTN pre-mRNA, chromatin loci/RNA/protein mapping, genome editing to remove RBM20\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — novel proximity mapping method with genome editing controls, preprint, single lab\",\n      \"pmids\": [\"39574693\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cytoplasmic mutant RBM20 (S637A) expressed specifically in atria causes spontaneous atrial tachycardia and increased AF inducibility independent of atrial structural remodeling or heart failure; mutant RBM20 in atria causes decreased and mislocalized connexin 43, abnormal Ca2+ handling, and altered phosphorylation of Ca2+-handling proteins—mechanisms independent of splicing regulation.\",\n      \"method\": \"Atrial-specific mutant RBM20 expression mouse model (SlnCre/+; LSL-Rbm20S637A), ECG, programmed stimulation, immunofluorescence, Ca2+ imaging\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific conditional expression mouse model with multiple cardiac functional readouts, single lab\",\n      \"pmids\": [\"40480405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Sorafenib inhibits RBM20 expression in rat hearts and human cardiomyocytes; this causes alternative splicing of RBM20 targets SLC25A3 and FHOD3 into fetal isoforms with decreased function; upregulation of RBM20 during sorafenib treatment reversed pathogenic splicing and enhanced mitochondrial phosphate transport by SLC25A3.\",\n      \"method\": \"Rat heart transcriptomics, human cardiomyocyte treatment, RBM20 overexpression rescue, ATP synthesis assays\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RBM20 overexpression rescue with functional mitochondrial readout, single lab\",\n      \"pmids\": [\"38006979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"A novel truncating RBM20 variant (c.1222DupC) introduces a premature termination codon generating a ~55 kDa truncated protein with complete loss of splicing activity and no dominant-negative effect on wild-type RBM20; the truncated protein localizes to both cytoplasm and nucleus but lacks RS and RRM domains; heterozygous iPSC-CMs show splicing defects in canonical targets (TTN, RYR2, CAMK2D, CACNA1G) and increased calcium transients, consistent with haploinsufficiency.\",\n      \"method\": \"Splicing reporter assays in HEK293 and neonatal rat cardiomyocytes, heterozygous iPSC-CMs, western blot, RT-PCR, RNA-seq, Ca2+ imaging\",\n      \"journal\": \"Circulation. Genomic and precision medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — iPSC-CM model with multiple splicing and functional assays, single lab\",\n      \"pmids\": [\"42059065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"RBM20 regulates Tau exon 6 and exon 10 alternative splicing as demonstrated by RNA-binding assays and qPCR in cell lines and neuronal organoids.\",\n      \"method\": \"RNA-binding assay, qPCR, cerebral organoid differentiation\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single binding assay and qPCR, no mechanistic follow-up; extends RBM20 function beyond cardiac context\",\n      \"pmids\": [\"42123583\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RBM20 is a vertebrate- and muscle-specific serine-arginine-rich (SR) splicing factor that represses exon inclusion by binding UCUU motifs (via its RRM domain with coupled folding-binding) predominantly in intronic regions flanking alternative exons, stalling the spliceosome at complex A through interactions with U1 and U2 snRNPs; its nuclear localization is mediated by Transportin-3 (TNPO3) through the RS/RSRSP domain, which is constitutively phosphorylated by SR kinases (SRPK1, CLK1, AKT2); pathogenic missense variants in the RSRSP stretch disrupt TNPO3 binding and nuclear import, causing cytoplasmic mislocalization and the formation of liquid-like pathogenic RNP granules that independently drive dilated cardiomyopathy beyond splicing loss; in the nucleus, RBM20 organizes a trans-interacting chromatin domain 'splicing factory' around the TTN locus that co-regulates CACNA1C, CAMK2D, and other cardiac gene transcripts; downstream, aberrant CAMK2D splicing and functional CAMK2D overactivation are central mediators of RBM20 cardiomyopathy heart failure and arrhythmia, and therapeutic strategies including ASO-mediated RBM20 downregulation, adenine base editing, and CAMK2D inhibition have been validated in animal models.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RBM20 is a muscle-specific RNA-binding splicing repressor that governs a cardiac alternative-splicing program centered on titin (TTN) and roughly 30 other heart genes, with loss-of-function causing pathological titin isoform shifts and dilated cardiomyopathy [#0]. It represses exon inclusion by binding UCUU elements predominantly in introns flanking alternative exons, where its RRM domain—extended by a C-terminal helix that undergoes coupled folding-binding upon engaging the final uracil—confers affinity and specificity for the motif [#30], while the RRM, ZnF2, and C-terminus together are necessary and sufficient for repressor activity [#5]. RBM20 stalls the spliceosome at complex A through interactions with U1 and U2 snRNPs, and assembles on nascent TTN pre-mRNA into nuclear foci [#1, #2]. These foci nucleate a cardiac trans-interacting chromatin domain or 'splicing factory' that brings the TTN locus into spatial proximity with other RBM20 targets including CACNA1C and CAMK2D to co-regulate their splicing [#6]. Beyond titin, RBM20 controls isoform switching of CAMK2D/CaMKIIδ, CACNA1C, FHOD3, and ENH, and supplies the substrate for a class of titin circular RNAs [#4, #14, #16, #18]. Nuclear import of RBM20 is mediated by Transportin-3 (TNPO3) via the RS/RSRSP domain, whose serine residues are constitutively phosphorylated by SRPK1, CLK1, and AKT2 [#8, #3, #12]. Pathogenic missense variants in the RSRSP stretch disrupt TNPO3 binding and nuclear import, driving cytoplasmic mislocalization and the formation of liquid-like RNP granules that fuse with stress granules and drive cardiomyopathy independently of splicing loss [#8, #7, #10]. Aberrant CAMK2D splicing and functional CAMK2D overactivation are central mediators of the resulting heart failure and arrhythmia [#28], and ASO-mediated RBM20 downregulation, adenine base editing, and CAMK2 inhibition rescue disease in animal models [#22, #24, #28, #26].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established RBM20 as a disease gene by showing its loss disrupts titin splicing, defining the first molecular function for the protein.\",\n      \"evidence\": \"Positional cloning and cardiac transcriptome deep sequencing in a mutant rat strain, confirmed in human\",\n      \"pmids\": [\"22466703\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the RNA motif or binding mechanism\", \"Did not establish how splicing regulation translates to cardiomyopathy\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed RBM20 represses splicing by binding titin pre-mRNA and forms nuclear speckles on partially processed transcripts, beginning to localize its mechanism of action.\",\n      \"evidence\": \"RNA binding assays, immunofluorescence, splicing reporters, and knockout rat\",\n      \"pmids\": [\"23307558\", \"23886709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spliceosomal partners not yet identified\", \"Genome-wide binding map absent\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the UCUU recognition motif and the step of spliceosome inhibition, explaining how RBM20 represses exon inclusion at the molecular level.\",\n      \"evidence\": \"Transcriptome-wide CLIP-seq, RNA-seq, and quantitative proteomics identifying U1/U2 snRNP interaction\",\n      \"pmids\": [\"24960161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of UCUU recognition unresolved\", \"Mechanism of complex A stalling not detailed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected RBM20 splicing to functional outputs by showing it generates titin circRNAs and tuning titin compliance, broadening its target repertoire.\",\n      \"evidence\": \"CircRNA profiling and RRM-deletion mice with passive stiffness measurements\",\n      \"pmids\": [\"27531932\", \"27630136\", \"27289039\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of titin circRNAs unclear\", \"Cooperative regulation with other RBPs incompletely mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified CAMK2D mis-splicing and calcium handling defects as a downstream consequence linking RBM20 loss to arrhythmia, and mapped the domain requirements for repression.\",\n      \"evidence\": \"Knockout mice/rats, patch-clamp electrophysiology, Ca2+ imaging, pharmacological rescue, and truncation/domain analysis\",\n      \"pmids\": [\"29650543\", \"29518215\", \"29725258\", \"30468920\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal sufficiency of CAMK2D not yet tested genetically\", \"RS-domain contribution to phenotype not separated from splicing loss\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established that RSRSP-stretch phosphorylation is constitutive and that disrupting this region impairs nuclear localization and causes DCM, shifting attention from splicing loss toward localization.\",\n      \"evidence\": \"Phospho-antibody staining and S637A knock-in mouse with titin isoform analysis\",\n      \"pmids\": [\"29895960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Importer mediating nuclear entry not identified\", \"Mechanism of phosphorylation control of import unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed a 3D-genome 'splicing factory' nucleated by TTN pre-mRNA that spatially organizes multiple RBM20 targets, providing a higher-order organizational principle for its regulation.\",\n      \"evidence\": \"Hi-C, RNA-seq, ATAC-seq, and CRISPR editing in iPSC-derived cardiomyocytes\",\n      \"pmids\": [\"30948719\", \"31717392\", \"31614708\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protein scaffolds organizing the factory not fully defined\", \"Causality of chromatin proximity for splicing efficiency partial\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that pathogenic variants produce gain-of-function cytoplasmic RNP granules with liquid-like properties, identifying a splicing-independent disease mechanism.\",\n      \"evidence\": \"Gene-edited pigs, patient iPSC-CMs, eCLIP, super-resolution microscopy, and condensate biochemistry\",\n      \"pmids\": [\"33188278\", \"34732726\", \"33110103\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Granule composition and toxicity mechanism incomplete\", \"Relative contribution of granules vs splicing loss not yet dissected in vivo\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Solved the RRM–UCUU structure showing coupled folding-binding of a C-terminal helix, explaining motif specificity at atomic resolution.\",\n      \"evidence\": \"NMR structure determination with affinity assays and helix mutagenesis\",\n      \"pmids\": [\"32187365\", \"29518215\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of RBM20 engaged with spliceosome unknown\", \"Higher-order RNA clustering geometry undefined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed RBM20 expression is tunable by circadian and pharmacological inputs, including retinoic acid rescue of haploinsufficiency, opening expression-based therapeutic strategies.\",\n      \"evidence\": \"Bmal1 KO mice, iPSC-CMs with retinoic acid treatment, splicing and contractility readouts\",\n      \"pmids\": [\"32905764\", \"36047761\", \"28676430\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional control circuitry partial\", \"Translatability of retinoic acid rescue unconfirmed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Genetically separated RS-domain-dependent localization from RRM-dependent splicing, establishing mislocalization/granule formation as the critical driver of severe DCM.\",\n      \"evidence\": \"RS-deletion vs RRM-deletion mouse models and S639G knock-in mice with echocardiography and RNA-seq\",\n      \"pmids\": [\"37219949\", \"35041844\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular toxicity of cytoplasmic granules not fully resolved\", \"Why frame-shift mutants are milder than RS mutants not fully explained\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified SRPK1, CLK1, and AKT2 as RSRSP-stretch kinases regulating target splicing, and catalogued RBM20 phosphosites controlling transport and condensation.\",\n      \"evidence\": \"In vitro/in vivo kinase assays, middle-down mass spectrometry, phosphomimetic mutants, and splicing reporters\",\n      \"pmids\": [\"36140694\", \"35394688\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab kinase findings\", \"Whether phosphorylation directly gates transport unresolved (phosphomimetics not sufficient in vitro)\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Validated therapeutic RBM20 reduction by ASO and correction by adenine base editing, demonstrating that restoring localization and splicing rescues cardiac function.\",\n      \"evidence\": \"ASO in mice and engineered human heart tissue; adenine base editing in iPSC-CMs and AAV delivery in knock-in mice\",\n      \"pmids\": [\"34851694\", \"36417486\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term safety and off-target effects of base editing unaddressed\", \"Optimal therapeutic window for RBM20 dosing undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended RBM20 phenotypes to atrial fibrillation and mitochondrial/structural defects, and linked drug-induced RBM20 suppression to pathogenic fetal isoform switching.\",\n      \"evidence\": \"Rat LOF model with electron microscopy and mitochondrial assays; sorafenib treatment with RBM20 rescue and ATP synthesis assays\",\n      \"pmids\": [\"38510713\", \"38006979\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking RBM20 to mitochondrial structure incomplete\", \"Single-lab observations\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped the protein and chromatin architecture of the TTN-centered RNA factory and showed RBM20 loss remodels its scaffolding factors, deepening the splicing-factory model.\",\n      \"evidence\": \"O-MAP proximity interactome mapping with genome editing (preprint)\",\n      \"pmids\": [\"39574693\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, single lab\", \"Functional roles of recruited factors QKI/SAFB not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated that reducing cytoplasmic RNP granules alleviates DCM without restoring target splicing, and that atrial cytoplasmic mutant RBM20 drives arrhythmia independently of splicing, cementing granule toxicity as a splicing-independent disease mechanism.\",\n      \"evidence\": \"ASO in S639G knock-in mice with granule quantification; atrial-specific mutant RBM20 mouse with ECG and Ca2+ imaging\",\n      \"pmids\": [\"40242865\", \"40480405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise biochemical mechanism of granule-driven dysfunction unresolved\", \"Connexin 43 mislocalization mechanism incomplete\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established CAMK2D as causally required for RBM20 cardiomyopathy through genetic epistasis and pharmacological rescue, identifying functional CAMK2D overactivation as a key downstream effector.\",\n      \"evidence\": \"Rbm20/Camk2d double-knockout mice, splice-variant re-expression, hesperadin treatment, and phosphoproteomics\",\n      \"pmids\": [\"42082791\", \"42059065\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative weighting of CAMK2D vs titin/granule pathways unclear\", \"Translatability of CAMK2 inhibition to patients untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the relative contributions of splicing loss, RNP-granule toxicity, and CAMK2D overactivation combine to produce specific cardiac phenotypes, and whether RBM20 functions outside cardiac/skeletal muscle, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Quantitative dissection of parallel disease mechanisms lacking\", \"Non-cardiac roles (e.g., Tau splicing) only weakly evidenced\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1, 2, 5, 30]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 8, 19]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [2, 6, 29]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7, 9, 10, 23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 21]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [0, 15]}\n    ],\n    \"complexes\": [\"TTN-locus splicing factory / trans-interacting chromatin domain\"],\n    \"partners\": [\"TNPO3\", \"SRPK1\", \"CLK1\", \"AKT2\", \"PTBP1\", \"RBM24\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}