{"gene":"TCAP","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":1998,"finding":"The NH2-terminal titin Ig repeats Z1 and Z2 bind to telethonin (T-cap) at the periphery of the Z-line; dominant-negative expression of either titin Z1-Z2 domains or telethonin in cardiac myocytes disrupts sarcomeric integrity, indicating this interaction is required for sarcomeric assembly.","method":"In vitro binding studies, dominant-negative overexpression in cardiac myocytes, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro binding plus dominant-negative functional rescue in primary cardiomyocytes; replicated in the same paper with multiple orthogonal approaches; independently confirmed by multiple subsequent papers","pmids":["9817758"],"is_preprint":false},{"year":1998,"finding":"Titin Z1 and Z2 domains interact specifically with telethonin in a conformation-dependent manner; longer titin fragments containing a serine-proline-rich phosphorylation site do not interact with telethonin, suggesting phosphorylation may regulate the interaction during myofibrillogenesis.","method":"Yeast two-hybrid analysis, protein binding assays, immunofluorescence on human myotubes","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus direct binding assay in a single lab; conformation-dependence is a distinct mechanistic observation","pmids":["9645487"],"is_preprint":false},{"year":2000,"finding":"FATZ (filamin-, actinin-, and telethonin-binding protein) binds to telethonin at the Z-disc, identified by GST overlay assay, placing telethonin in a multi-protein interaction network at the Z-disc.","method":"Glutathione S-transferase (GST) overlay assay, yeast two-hybrid","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — GST overlay is a single binding method; single lab but consistent with broader Z-disc interaction network","pmids":["10984498"],"is_preprint":false},{"year":2001,"finding":"Telethonin specifically interacts with the cytoplasmic domain of minK (the potassium channel beta-subunit) via the sixteen C-terminal residues of telethonin; both proteins co-localize at the Z-line region in cardiac muscle on T-tubular membranes, suggesting telethonin functions as an adapter linking myofibrillar components to the IKs channel complex.","method":"In vitro interaction studies, immunofluorescence with confocal analysis, membrane-washing experiments","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding mapped to specific residues, co-localization confirmed; single lab","pmids":["11697903"],"is_preprint":false},{"year":2002,"finding":"Solution scattering and analytical ultracentrifugation reveal that telethonin acts as a central linker cross-linking two titin Z1Z2 molecules in an antiparallel 1:2 (telethonin:titin) complex; full-length telethonin dimerizes two such complexes at higher concentrations, suggesting a role in linking titin filaments at the Z-disc periphery.","method":"Analytical ultracentrifugation, synchrotron radiation X-ray scattering (SAXS), ab initio low-resolution modeling","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — solution scattering structural determination plus sedimentation, stoichiometry precisely defined; single lab but Tier 1 method quality","pmids":["12446666"],"is_preprint":false},{"year":2004,"finding":"HCM-associated TCAP mutations (T137I, R153H) augment telethonin's interaction with titin and calsarcin-1, while DCM-associated mutations (E132Q, R87Q) impair telethonin's interaction with MLP, titin, and calsarcin-1, demonstrating that the clinical phenotype (HCM vs. DCM) correlates with altered binding properties among Z-disc components.","method":"Yeast two-hybrid, GST pull-down competition assays","journal":"Journal of the American College of Cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal qualitative binding assays; single lab, no quantitative affinity measurements","pmids":["15582318"],"is_preprint":false},{"year":2006,"finding":"MDM2 specifically binds TCAP (telethonin), co-localizes with it in the nucleus, and promotes its degradation via the ubiquitin-independent proteasomal pathway; this degradation is inhibited by p14ARF, and elevated MDM2 expression can alter the subcellular localization of TCAP.","method":"Yeast two-hybrid screen, GST pull-down, co-immunoprecipitation, confocal microscopy, proteasome inhibitor experiments","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus GST pulldown, localization and degradation assays; single lab","pmids":["16678796"],"is_preprint":false},{"year":2006,"finding":"Crystal structure and SAXS data show telethonin assembles two titin N-terminal Z1Z2 domains into a palindromic antiparallel sandwich (2:1 titin:telethonin); the telethonin C-terminus does not form a defined structure even when bound to titin, but mediates dimerization of two titin/telethonin complexes.","method":"X-ray crystallography, small-angle X-ray scattering, circular dichroism, in vivo complementation","journal":"Journal of structural biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus SAXS plus CD; orthogonal structural methods and in vivo validation in a single rigorous study","pmids":["16713295"],"is_preprint":false},{"year":2007,"finding":"BMP10 physically interacts with telethonin at the Z-disc stretch-sensing region; a human BMP10 variant (Thr326Ile) associated with hypertensive dilated cardiomyopathy shows decreased binding to Tcap and increased extracellular secretion, with enhanced hypertrophic effect in neonatal cardiomyocytes.","method":"Co-immunoprecipitation, immunofluorescence co-localization, cell transfection and conditioned medium cardiomyocyte hypertrophy assay","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional cardiomyocyte assay; single lab","pmids":["17921333"],"is_preprint":false},{"year":2008,"finding":"Telethonin is expressed in human gastrointestinal smooth muscle, co-localizes with Nav1.5, and co-immunoprecipitates with sodium channels; a TCAP mutation found in a patient with intestinal pseudo-obstruction, when co-expressed with SCN5A in HEK293 cells, alters steady-state activation kinetics of Nav1.5 resulting in a doubling of the window current.","method":"Co-immunoprecipitation, immunofluorescence, patch-clamp electrophysiology in HEK293 cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional electrophysiology; single lab, novel interaction with Nav1.5","pmids":["18408010"],"is_preprint":false},{"year":2008,"finding":"Telethonin is a substrate of the ubiquitin-proteasome system during muscle atrophy; purification of ubiquitin conjugates followed by deubiquitination identified telethonin as a 26S proteasome substrate in unloaded (atrophying) soleus muscle.","method":"Ubiquitin conjugate purification using S5a subunit, deubiquitination, mass spectrometry identification","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical purification with proteomics identification; single lab, limited follow-up on mechanism","pmids":["18565784"],"is_preprint":false},{"year":2008,"finding":"Telethonin knockdown by siRNA in differentiating skeletal muscle cells decreases expression of myogenic regulatory factors and prevents normal muscle cell phenotype development, indicating TCAP is required for myoblast differentiation.","method":"siRNA knockdown, Northern blots, real-time RT-PCR, cell morphology assessment","journal":"Neuromuscular disorders : NMD","confidence":"Low","confidence_rationale":"Tier 3 / Weak — RNA-level knockdown with downstream gene expression readouts; no protein-level mechanism established","pmids":["18440815"],"is_preprint":false},{"year":2008,"finding":"Proapoptotic protein Siva specifically interacts with telethonin in cardiomyocytes during coxsackievirus B3 infection; Siva expression is increased in CVB3-infected mouse heart tissue and the proteins co-localize in cardiomyocytes.","method":"Yeast two-hybrid screen of human heart cDNA library, co-localization in infected cardiomyocytes","journal":"Cardiovascular research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid plus co-localization; no biochemical validation of direct interaction (no Co-IP); single lab","pmids":["18849585"],"is_preprint":false},{"year":2009,"finding":"Single-molecule force spectroscopy shows the titin-telethonin complex forms a highly directed molecular bond that resists ultra-high forces when loaded along its physiological direction (along the filament axis) but breaks easily in other directions, demonstrating the bond is mechanically anisotropic and optimized for the Z-disc's mechanical environment.","method":"Single-molecule force spectroscopy (AFM-based), reconstituted titin-telethonin complex","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted complex with single-molecule mechanical characterization; novel directional force measurement is a rigorous biophysical finding","pmids":["19622741"],"is_preprint":false},{"year":2009,"finding":"In zebrafish, Tcap depletion causes muscular dystrophy-like phenotypes; Tcap integrates into the sarcomere after Z-disc periodicity is established (sarcomere assembly remains intact in morphants), but sarcomere-plasma membrane interaction and T-tubule development are disrupted. Additionally, Tcap expression level is negatively regulated by integrin-linked kinase (ILK) and is inducible by mechanical stretch.","method":"Morpholino knockdown in zebrafish, immunofluorescence, electron microscopy, genetic epistasis with ILK","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — morpholino KD with multiple structural phenotype readouts and epistasis; single lab zebrafish model","pmids":["19679566"],"is_preprint":false},{"year":2010,"finding":"Tcap knockout mice develop dystrophic skeletal muscle histology (myofiber size variation, central nucleation) and show increased myostatin protein levels alongside Tcap loss, as well as increased muscle stiffness; this establishes Tcap as functionally important for muscle fiber maintenance and suggests a regulatory relationship with myostatin.","method":"Tcap knockout mouse model, muscle histology, Western blot for myostatin, force and stiffness assays of isolated muscles","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO mouse model with defined histological and biomechanical phenotypes; single lab","pmids":["20233748"],"is_preprint":false},{"year":2010,"finding":"In Xenopus, telethonin knockdown causes embryonic paralysis and sarcomeric disruption; these defects are rescued by full-length telethonin mRNA but not by C-terminal truncation or alanine substitution of four C-terminal phosphorylatable residues, establishing that the C-terminus of telethonin is required for sarcomere assembly.","method":"Morpholino knockdown in Xenopus, mRNA rescue with deletion and phospho-mutant constructs, sarcomere ultrastructure analysis","journal":"Developmental dynamics : an official publication of the American Association of Anatomists","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — morpholino KD with structure-function rescue; context-dependent results noted by authors; single lab","pmids":["20235223"],"is_preprint":false},{"year":2011,"finding":"Telethonin knockout in mice does not impair baseline heart development or function, indicating it is not indispensable for titin anchoring per se (actin-titin cross-links via α-actinin are sufficient for Z-disc stability). However, telethonin deficiency leads to heart failure after biomechanical stress, partly through elevated p53-mediated apoptosis in cardiomyocytes; telethonin modulates turnover of the proapoptotic tumor suppressor p53 in the nuclear compartment following mechanical stress.","method":"Telethonin KO mouse model, mechanical stress (aortic banding), p53 turnover assays, nuclear fractionation, cardiac function measurements","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mice plus biomechanical stress challenge plus p53 mechanistic analysis; multiple orthogonal methods in a single rigorous study","pmids":["21799151"],"is_preprint":false},{"year":2012,"finding":"Telethonin knockout mice display progressive t-tubule loss, Ca2+ transient dysynchrony, elevated Ca2+ spark frequency, and depressed L-type Ca2+ channel activity with age and after aortic banding; this identifies telethonin as a critical load-sensitive regulator of t-tubule structure and calcium-induced calcium release.","method":"Tcap KO mice, confocal t-tubule imaging, Ca2+ transient and spark measurements, aortic banding mechanical overload model","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO plus mechanical stress model plus multiple calcium imaging endpoints; mechanistic link between telethonin, t-tubule structure, and CICR established","pmids":["23100327"],"is_preprint":false},{"year":2013,"finding":"Telethonin is constitutively bis-phosphorylated at Ser-157 and Ser-161 in adult rat and mouse ventricular myocardium; protein kinase D and CaMKII phosphorylate these sites in vitro. Expression of non-phosphorylatable S157A/S161A telethonin in cardiomyocytes disrupts t-tubule organization and prolongs/increases variance of intracellular Ca2+ transients, establishing that telethonin phosphorylation is required for normal t-tubule and calcium homeostasis.","method":"In vitro kinase assays, mass spectrometry, site-directed mutagenesis, phosphate affinity electrophoresis, adenoviral gene transfer, confocal imaging of t-tubules, Ca2+ transient measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with MS identification of phosphosites, mutagenesis in primary cardiomyocytes with functional readout; multiple orthogonal Tier 1–2 methods in a single study","pmids":["24280220"],"is_preprint":false},{"year":2014,"finding":"CLOCK and BMAL1 transcriptional activators directly target the Tcap promoter, driving circadian oscillation of Tcap mRNA and TCAP protein in the heart; Tcap mRNA rhythmicity is blunted in Clock-mutant hearts.","method":"ChIP assay, biotinylated oligonucleotide promoter binding, luciferase reporter assay, real-time PCR in circadian mutant mice","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus promoter reporter assays; single lab, but multiple orthogonal methods confirming circadian regulation","pmids":["25121604"],"is_preprint":false},{"year":2017,"finding":"Telethonin is a substrate of MuRF1 E3 ubiquitin ligase; telethonin facilitates and stabilizes MuRF1-E2 (specifically E2E1 and E2J1) complexes, and its presence governs the affinity between MuRF1 and these E2 enzymes. Co-expression of MuRF1 with these E2s in HEK293T cells leads to increased telethonin degradation.","method":"Surface plasmon resonance, yeast three-hybrid, split-GFP complementation, HEK293T co-expression degradation assay","journal":"Journal of cachexia, sarcopenia and muscle","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — three orthogonal interaction assays (SPR, Y3H, split-GFP) plus functional degradation assay; rigorous multi-method single study","pmids":["29271608"],"is_preprint":false},{"year":2020,"finding":"FBXL21 interacts with TCAP in skeletal muscle in a circadian manner antiphasic to TCAP accumulation; GSK-3β phosphorylates both FBXL21 and TCAP to activate phosphodegron-dependent TCAP degradation via the SCF-FBXL21 complex. GSK-3β inhibition or knockdown diminishes FBXL21-Cul1 complex formation and delays TCAP degradation. Loss of this regulatory axis (Psttm Fbxl21 hypomorph mice) causes impaired skeletal muscle fiber size, exercise tolerance, and grip strength.","method":"Co-immunoprecipitation, in vivo phosphorylation assays, GSK-3β inhibition/knockdown, Psttm mouse model, skeletal muscle functional testing","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, kinase phosphorylation assays, genetic mouse model with defined functional phenotype; multiple orthogonal methods in one study","pmids":["32937135"],"is_preprint":false},{"year":2020,"finding":"TCAP variants p.E49K and p.R153H reduce peak Nav1.5 sodium current density in HEK293 cells stably expressing hNav1.5, with p.E49K also shifting the voltage dependency of steady-state inactivation leftward; these findings demonstrate TCAP modulates Nav1.5 channel function and that specific mutations cause loss-of-function of INa.","method":"Patch-clamp electrophysiology in HEK293 cells, transfection of wild-type vs. variant TCAP","journal":"Pacing and clinical electrophysiology : PACE","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct electrophysiology in heterologous expression system; single lab, confirms earlier Nav1.5 interaction finding","pmids":["32588437"],"is_preprint":false},{"year":2024,"finding":"Tcap knockout zebrafish (CRISPR/Cas9) show muscular dystrophy phenotypes, abnormal mitochondria in skeletal muscle, inhibited stretch-sensing ability, altered cardiac morphology and function, increased ROS and mitophagy; impaired cardiac regeneration and cardiomyocyte proliferation after injury are rescued by ROS scavengers or autophagy inhibitors, identifying elevated ROS and autophagy as downstream effectors of Tcap deficiency.","method":"CRISPR/Cas9 knockout zebrafish, ROS measurement, mitophagy markers, cardiac regeneration assay, pharmacological rescue","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean CRISPR KO with pharmacological rescue linking ROS/autophagy to phenotype; single lab, zebrafish model","pmids":["39226992"],"is_preprint":false}],"current_model":"TCAP/telethonin is a small (19 kDa) Z-disc protein that forms a palindromic, mechanically anisotropic sandwich complex with the N-terminal Z1Z2 immunoglobulin domains of titin to anchor titin filaments at the Z-disc periphery; it also bridges the sarcomere to T-tubule membranes by binding minK (IKs channel β-subunit) and modulates Nav1.5 sodium channel kinetics, serves as a substrate for MuRF1/SCF-FBXL21 E3 ubiquitin ligases (with GSK-3β-driven phosphodegron-dependent circadian degradation), is constitutively bis-phosphorylated at Ser-157/Ser-161 by PKD and CaMKII to maintain t-tubule organization and calcium transient fidelity, and following biomechanical stress translocates to the nucleus to modulate p53 turnover and apoptosis, with additional interactions with calsarcin-1, MLP, FATZ, BMP10, and Siva linking it to stretch-sensing signaling and cardiomyocyte survival."},"narrative":{"mechanistic_narrative":"TCAP (telethonin) is a small Z-disc protein that anchors titin filaments at the sarcomere periphery and serves as a mechanical and signaling hub coupling sarcomeric integrity to membrane organization and cardiomyocyte survival [PMID:9817758, PMID:21799151]. Its defining biochemical activity is to cross-link two N-terminal titin Z1Z2 immunoglobulin domains into a palindromic antiparallel 2:1 (titin:telethonin) sandwich, with the C-terminus mediating dimerization of these complexes and being required for sarcomere assembly in vivo [PMID:12446666, PMID:16713295, PMID:20235223]; single-molecule force spectroscopy shows this bond is mechanically anisotropic, resisting ultra-high force only along the physiological filament axis [PMID:19622741]. Telethonin sits within a broader Z-disc interaction network, binding FATZ, calsarcin-1, MLP, and BMP10, and disease-associated mutations remodel these interactions in patterns that track with hypertrophic versus dilated cardiomyopathy [PMID:10984498, PMID:15582318, PMID:17921333]. Beyond structural anchoring, telethonin bridges the sarcomere to membrane excitability by binding the minK IKs channel beta-subunit and modulating Nav1.5 sodium channel kinetics, with TCAP variants altering INa [PMID:11697903, PMID:18408010, PMID:32588437]. Loss-of-function studies across zebrafish, Xenopus, and mouse establish that telethonin is dispensable for baseline titin anchoring but essential for T-tubule development, calcium-induced calcium release, and resistance to biomechanical stress, where its deficiency drives heart failure through elevated nuclear p53-mediated apoptosis [PMID:19679566, PMID:20235223, PMID:21799151, PMID:23100327]. Constitutive bis-phosphorylation at Ser-157/Ser-161 by PKD and CaMKII maintains T-tubule organization and calcium transient fidelity [PMID:24280220]. Telethonin abundance is dynamically controlled: it is a substrate of the MuRF1 and SCF-FBXL21 E3 ubiquitin ligases, with GSK-3beta-driven phosphodegron-dependent circadian degradation and CLOCK/BMAL1 transcriptional control conferring diurnal oscillation of its levels in muscle [PMID:18565784, PMID:25121604, PMID:29271608, PMID:32937135]. TCAP loss is also linked to dystrophic skeletal muscle and impaired cardiac regeneration through elevated ROS and autophagy [PMID:20233748, PMID:39226992].","teleology":[{"year":1998,"claim":"Established that telethonin binds the N-terminal titin Z1Z2 immunoglobulin domains and that this interaction is required for sarcomeric assembly, defining TCAP's core structural role.","evidence":"In vitro binding, yeast two-hybrid, and dominant-negative overexpression in cardiac myocytes","pmids":["9817758","9645487"],"confidence":"High","gaps":["Stoichiometry and architecture of the complex not yet resolved","Whether the interaction directly anchors filaments versus assembling them not distinguished"]},{"year":2000,"claim":"Placed telethonin within a multiprotein Z-disc network by identifying FATZ as a direct binding partner, beginning the mapping of its interactome.","evidence":"GST overlay assay and yeast two-hybrid","pmids":["10984498"],"confidence":"Medium","gaps":["Single binding method","Functional consequence of FATZ binding not tested"]},{"year":2001,"claim":"Extended telethonin's role from purely structural to membrane-coupling by showing it links myofibrillar components to the IKs channel via the minK cytoplasmic domain at T-tubular membranes.","evidence":"In vitro interaction mapping to C-terminal residues and confocal co-localization in cardiac muscle","pmids":["11697903"],"confidence":"Medium","gaps":["Functional effect on IKs current not measured","Single lab"]},{"year":2002,"claim":"Resolved how telethonin organizes titin filaments by defining a 1:2 antiparallel cross-linking complex that can further dimerize, providing a structural basis for filament tethering at the Z-disc.","evidence":"Analytical ultracentrifugation and SAXS with ab initio modeling","pmids":["12446666"],"confidence":"High","gaps":["No atomic-resolution structure yet","C-terminal organization unresolved"]},{"year":2004,"claim":"Connected TCAP biochemistry to disease by showing HCM- and DCM-associated mutations differentially remodel binding to titin, calsarcin-1, and MLP, linking phenotype to altered Z-disc interactions.","evidence":"Yeast two-hybrid and GST pull-down competition assays","pmids":["15582318"],"confidence":"Medium","gaps":["No quantitative affinity measurements","In vivo validation of mutation effects absent"]},{"year":2006,"claim":"Revealed a nuclear/degradation dimension by showing MDM2 binds telethonin, alters its localization, and promotes ubiquitin-independent proteasomal degradation, antagonized by p14ARF.","evidence":"Yeast two-hybrid, reciprocal Co-IP, GST pull-down, and proteasome inhibitor assays","pmids":["16678796"],"confidence":"Medium","gaps":["Physiological context of nuclear telethonin not established here","Single lab"]},{"year":2006,"claim":"Provided the high-resolution architecture of the titin-telethonin sandwich, confirming a palindromic 2:1 assembly and identifying the disordered C-terminus as the dimerization mediator.","evidence":"X-ray crystallography, SAXS, circular dichroism, and in vivo complementation","pmids":["16713295"],"confidence":"High","gaps":["C-terminal structure undefined even when titin-bound","Mechanical behavior of the bond not addressed"]},{"year":2007,"claim":"Linked telethonin to stretch-sensing signaling through direct BMP10 binding, with a cardiomyopathy-associated BMP10 variant showing reduced Tcap binding and enhanced hypertrophic effect.","evidence":"Co-IP, co-localization, and cardiomyocyte hypertrophy assay with conditioned medium","pmids":["17921333"],"confidence":"Medium","gaps":["Direct functional role of Tcap in BMP10 retention not isolated","Single lab"]},{"year":2008,"claim":"Demonstrated telethonin modulates cardiac/smooth-muscle excitability by co-immunoprecipitating with Nav1.5 and showing a patient mutation alters channel activation and window current.","evidence":"Co-IP, immunofluorescence, and patch-clamp in HEK293 cells","pmids":["18408010"],"confidence":"Medium","gaps":["Mechanism of channel modulation not defined","Single lab"]},{"year":2008,"claim":"Identified telethonin as a proteasome substrate during muscle atrophy and as required for myoblast differentiation, beginning to define its turnover and developmental functions.","evidence":"Ubiquitin conjugate purification with mass spectrometry; siRNA knockdown in differentiating muscle cells","pmids":["18565784","18440815"],"confidence":"Medium","gaps":["E3 ligase responsible for atrophy degradation not yet identified","Knockdown effect on differentiation is RNA-level only with no protein mechanism"]},{"year":2008,"claim":"Linked telethonin to cardiomyocyte apoptosis during viral infection by identifying the proapoptotic protein Siva as a binding partner.","evidence":"Yeast two-hybrid screen and co-localization in CVB3-infected cardiomyocytes","pmids":["18849585"],"confidence":"Low","gaps":["No biochemical confirmation of direct interaction (no Co-IP)","Functional consequence not tested","Single lab"]},{"year":2009,"claim":"Defined the mechanical logic of the titin-telethonin bond, showing it is directionally optimized to resist ultra-high force only along the physiological filament axis.","evidence":"Single-molecule AFM force spectroscopy on reconstituted complex","pmids":["19622741"],"confidence":"High","gaps":["In vivo relevance of anisotropy to Z-disc function inferred not directly tested"]},{"year":2009,"claim":"Separated telethonin's role in sarcomere assembly from membrane organization in vivo, showing Tcap integrates after Z-disc periodicity is set and is required for T-tubule development, and is mechanically inducible and ILK-regulated.","evidence":"Morpholino knockdown in zebrafish with EM, immunofluorescence, and ILK epistasis","pmids":["19679566"],"confidence":"Medium","gaps":["Mechanism coupling Tcap to T-tubule development unresolved","Morpholino specificity caveats"]},{"year":2010,"claim":"Established the in vivo necessity of telethonin for muscle maintenance and the requirement of its C-terminus for sarcomere assembly, while linking Tcap loss to elevated myostatin.","evidence":"Tcap knockout mouse histology and biomechanics; Xenopus morpholino rescue with truncation and phospho-mutant constructs","pmids":["20233748","20235223"],"confidence":"Medium","gaps":["Mechanism of myostatin regulation not defined","Context-dependence of phospho-mutant rescue noted by authors"]},{"year":2011,"claim":"Showed telethonin is dispensable for baseline titin anchoring but essential for stress tolerance, acting in the nucleus to modulate p53 turnover and limit cardiomyocyte apoptosis after biomechanical stress.","evidence":"Tcap KO mice with aortic banding, p53 turnover assays, and nuclear fractionation","pmids":["21799151"],"confidence":"High","gaps":["Mechanism of stress-induced nuclear translocation not defined","Direct biochemical link between telethonin and p53 turnover not fully resolved"]},{"year":2012,"claim":"Identified telethonin as a load-sensitive regulator of T-tubule structure and calcium-induced calcium release, with KO causing progressive t-tubule loss and Ca2+ handling defects under overload.","evidence":"Tcap KO mice with confocal t-tubule imaging, Ca2+ transient/spark measurements, and aortic banding","pmids":["23100327"],"confidence":"High","gaps":["Molecular link from telethonin to t-tubule maintenance machinery not defined"]},{"year":2013,"claim":"Defined post-translational control of telethonin's membrane/calcium function, showing constitutive bis-phosphorylation at Ser-157/Ser-161 by PKD and CaMKII is required for normal t-tubule organization and Ca2+ transient fidelity.","evidence":"In vitro kinase assays, MS phosphosite mapping, phospho-mutant adenoviral transfer, and Ca2+ imaging in cardiomyocytes","pmids":["24280220"],"confidence":"High","gaps":["How phosphorylation mechanistically maintains t-tubules unresolved","Upstream signals controlling these kinases on telethonin not defined"]},{"year":2014,"claim":"Revealed transcriptional circadian control of Tcap, with CLOCK/BMAL1 directly driving rhythmic Tcap expression in the heart.","evidence":"ChIP, promoter binding, luciferase reporter, and RT-PCR in circadian-mutant mice","pmids":["25121604"],"confidence":"Medium","gaps":["Physiological consequence of rhythmic Tcap not established","Single lab"]},{"year":2017,"claim":"Defined telethonin as a MuRF1 substrate that also stabilizes MuRF1-E2 (E2E1, E2J1) complexes and governs MuRF1-E2 affinity, integrating it into atrophy-associated ubiquitination.","evidence":"Surface plasmon resonance, yeast three-hybrid, split-GFP complementation, and HEK293T degradation assay","pmids":["29271608"],"confidence":"High","gaps":["In vivo contribution of MuRF1-mediated turnover to muscle phenotype not isolated"]},{"year":2020,"claim":"Identified a circadian degradation axis in which GSK-3beta phosphorylates TCAP and FBXL21 to drive SCF-FBXL21 phosphodegron-dependent TCAP turnover, with loss impairing muscle fiber size and strength.","evidence":"Co-IP, in vivo phosphorylation assays, GSK-3beta inhibition/knockdown, and Psttm Fbxl21 hypomorph mouse functional testing","pmids":["32937135"],"confidence":"High","gaps":["Interplay between MuRF1 and SCF-FBXL21 control of TCAP not reconciled","Phosphodegron residues' relationship to PKD/CaMKII sites unclear"]},{"year":2020,"claim":"Confirmed direct functional modulation of Nav1.5 by TCAP, showing variants p.E49K and p.R153H reduce peak INa with p.E49K shifting inactivation, establishing channel loss-of-function.","evidence":"Patch-clamp in HEK293 cells stably expressing hNav1.5 with wild-type versus variant TCAP","pmids":["32588437"],"confidence":"Medium","gaps":["Mechanism by which TCAP couples to Nav1.5 gating not defined","Single lab heterologous system"]},{"year":2024,"claim":"Identified ROS and autophagy as downstream effectors of Tcap deficiency, with mitochondrial dysfunction, impaired cardiac regeneration, and stretch-sensing defects rescued by ROS scavengers or autophagy inhibitors.","evidence":"CRISPR/Cas9 knockout zebrafish with ROS and mitophagy measurement, cardiac regeneration assay, and pharmacological rescue","pmids":["39226992"],"confidence":"Medium","gaps":["Molecular link from Tcap loss to ROS elevation not defined","Single lab zebrafish model"]},{"year":null,"claim":"How biomechanical stress triggers telethonin nuclear translocation and the direct molecular mechanism by which it modulates p53 turnover remain undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No defined translocation signal or trafficking mechanism","Direct telethonin-p53 biochemical relationship unresolved","Integration of structural anchoring, signaling, and degradation roles into one model incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3,4,7]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,4,7,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,9,23]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,4,7,14]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,17]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,14,18]}],"pathway":[{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[0,14,15,16]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[10,21,22]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[17,24]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[20,22]}],"complexes":["titin-telethonin Z-disc complex","Z-disc (FATZ/calsarcin/MLP network)"],"partners":["TTN","KCNE1","FATZ","MDM2","BMP10","SCN5A","TRIM63","FBXL21"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O15273","full_name":"Telethonin","aliases":["Titin cap protein"],"length_aa":167,"mass_kda":19.1,"function":"Muscle assembly regulating factor. 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dominant-negative overexpression in cardiac myocytes, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro binding plus dominant-negative functional rescue in primary cardiomyocytes; replicated in the same paper with multiple orthogonal approaches; independently confirmed by multiple subsequent papers\",\n      \"pmids\": [\"9817758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Titin Z1 and Z2 domains interact specifically with telethonin in a conformation-dependent manner; longer titin fragments containing a serine-proline-rich phosphorylation site do not interact with telethonin, suggesting phosphorylation may regulate the interaction during myofibrillogenesis.\",\n      \"method\": \"Yeast two-hybrid analysis, protein binding assays, immunofluorescence on human myotubes\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus direct binding assay in a single lab; conformation-dependence is a distinct mechanistic observation\",\n      \"pmids\": [\"9645487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"FATZ (filamin-, actinin-, and telethonin-binding protein) binds to telethonin at the Z-disc, identified by GST overlay assay, placing telethonin in a multi-protein interaction network at the Z-disc.\",\n      \"method\": \"Glutathione S-transferase (GST) overlay assay, yeast two-hybrid\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — GST overlay is a single binding method; single lab but consistent with broader Z-disc interaction network\",\n      \"pmids\": [\"10984498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Telethonin specifically interacts with the cytoplasmic domain of minK (the potassium channel beta-subunit) via the sixteen C-terminal residues of telethonin; both proteins co-localize at the Z-line region in cardiac muscle on T-tubular membranes, suggesting telethonin functions as an adapter linking myofibrillar components to the IKs channel complex.\",\n      \"method\": \"In vitro interaction studies, immunofluorescence with confocal analysis, membrane-washing experiments\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding mapped to specific residues, co-localization confirmed; single lab\",\n      \"pmids\": [\"11697903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Solution scattering and analytical ultracentrifugation reveal that telethonin acts as a central linker cross-linking two titin Z1Z2 molecules in an antiparallel 1:2 (telethonin:titin) complex; full-length telethonin dimerizes two such complexes at higher concentrations, suggesting a role in linking titin filaments at the Z-disc periphery.\",\n      \"method\": \"Analytical ultracentrifugation, synchrotron radiation X-ray scattering (SAXS), ab initio low-resolution modeling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — solution scattering structural determination plus sedimentation, stoichiometry precisely defined; single lab but Tier 1 method quality\",\n      \"pmids\": [\"12446666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HCM-associated TCAP mutations (T137I, R153H) augment telethonin's interaction with titin and calsarcin-1, while DCM-associated mutations (E132Q, R87Q) impair telethonin's interaction with MLP, titin, and calsarcin-1, demonstrating that the clinical phenotype (HCM vs. DCM) correlates with altered binding properties among Z-disc components.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down competition assays\",\n      \"journal\": \"Journal of the American College of Cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal qualitative binding assays; single lab, no quantitative affinity measurements\",\n      \"pmids\": [\"15582318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MDM2 specifically binds TCAP (telethonin), co-localizes with it in the nucleus, and promotes its degradation via the ubiquitin-independent proteasomal pathway; this degradation is inhibited by p14ARF, and elevated MDM2 expression can alter the subcellular localization of TCAP.\",\n      \"method\": \"Yeast two-hybrid screen, GST pull-down, co-immunoprecipitation, confocal microscopy, proteasome inhibitor experiments\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus GST pulldown, localization and degradation assays; single lab\",\n      \"pmids\": [\"16678796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure and SAXS data show telethonin assembles two titin N-terminal Z1Z2 domains into a palindromic antiparallel sandwich (2:1 titin:telethonin); the telethonin C-terminus does not form a defined structure even when bound to titin, but mediates dimerization of two titin/telethonin complexes.\",\n      \"method\": \"X-ray crystallography, small-angle X-ray scattering, circular dichroism, in vivo complementation\",\n      \"journal\": \"Journal of structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus SAXS plus CD; orthogonal structural methods and in vivo validation in a single rigorous study\",\n      \"pmids\": [\"16713295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"BMP10 physically interacts with telethonin at the Z-disc stretch-sensing region; a human BMP10 variant (Thr326Ile) associated with hypertensive dilated cardiomyopathy shows decreased binding to Tcap and increased extracellular secretion, with enhanced hypertrophic effect in neonatal cardiomyocytes.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, cell transfection and conditioned medium cardiomyocyte hypertrophy assay\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional cardiomyocyte assay; single lab\",\n      \"pmids\": [\"17921333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Telethonin is expressed in human gastrointestinal smooth muscle, co-localizes with Nav1.5, and co-immunoprecipitates with sodium channels; a TCAP mutation found in a patient with intestinal pseudo-obstruction, when co-expressed with SCN5A in HEK293 cells, alters steady-state activation kinetics of Nav1.5 resulting in a doubling of the window current.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, patch-clamp electrophysiology in HEK293 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional electrophysiology; single lab, novel interaction with Nav1.5\",\n      \"pmids\": [\"18408010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Telethonin is a substrate of the ubiquitin-proteasome system during muscle atrophy; purification of ubiquitin conjugates followed by deubiquitination identified telethonin as a 26S proteasome substrate in unloaded (atrophying) soleus muscle.\",\n      \"method\": \"Ubiquitin conjugate purification using S5a subunit, deubiquitination, mass spectrometry identification\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical purification with proteomics identification; single lab, limited follow-up on mechanism\",\n      \"pmids\": [\"18565784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Telethonin knockdown by siRNA in differentiating skeletal muscle cells decreases expression of myogenic regulatory factors and prevents normal muscle cell phenotype development, indicating TCAP is required for myoblast differentiation.\",\n      \"method\": \"siRNA knockdown, Northern blots, real-time RT-PCR, cell morphology assessment\",\n      \"journal\": \"Neuromuscular disorders : NMD\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — RNA-level knockdown with downstream gene expression readouts; no protein-level mechanism established\",\n      \"pmids\": [\"18440815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Proapoptotic protein Siva specifically interacts with telethonin in cardiomyocytes during coxsackievirus B3 infection; Siva expression is increased in CVB3-infected mouse heart tissue and the proteins co-localize in cardiomyocytes.\",\n      \"method\": \"Yeast two-hybrid screen of human heart cDNA library, co-localization in infected cardiomyocytes\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid plus co-localization; no biochemical validation of direct interaction (no Co-IP); single lab\",\n      \"pmids\": [\"18849585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Single-molecule force spectroscopy shows the titin-telethonin complex forms a highly directed molecular bond that resists ultra-high forces when loaded along its physiological direction (along the filament axis) but breaks easily in other directions, demonstrating the bond is mechanically anisotropic and optimized for the Z-disc's mechanical environment.\",\n      \"method\": \"Single-molecule force spectroscopy (AFM-based), reconstituted titin-telethonin complex\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted complex with single-molecule mechanical characterization; novel directional force measurement is a rigorous biophysical finding\",\n      \"pmids\": [\"19622741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In zebrafish, Tcap depletion causes muscular dystrophy-like phenotypes; Tcap integrates into the sarcomere after Z-disc periodicity is established (sarcomere assembly remains intact in morphants), but sarcomere-plasma membrane interaction and T-tubule development are disrupted. Additionally, Tcap expression level is negatively regulated by integrin-linked kinase (ILK) and is inducible by mechanical stretch.\",\n      \"method\": \"Morpholino knockdown in zebrafish, immunofluorescence, electron microscopy, genetic epistasis with ILK\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morpholino KD with multiple structural phenotype readouts and epistasis; single lab zebrafish model\",\n      \"pmids\": [\"19679566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tcap knockout mice develop dystrophic skeletal muscle histology (myofiber size variation, central nucleation) and show increased myostatin protein levels alongside Tcap loss, as well as increased muscle stiffness; this establishes Tcap as functionally important for muscle fiber maintenance and suggests a regulatory relationship with myostatin.\",\n      \"method\": \"Tcap knockout mouse model, muscle histology, Western blot for myostatin, force and stiffness assays of isolated muscles\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO mouse model with defined histological and biomechanical phenotypes; single lab\",\n      \"pmids\": [\"20233748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In Xenopus, telethonin knockdown causes embryonic paralysis and sarcomeric disruption; these defects are rescued by full-length telethonin mRNA but not by C-terminal truncation or alanine substitution of four C-terminal phosphorylatable residues, establishing that the C-terminus of telethonin is required for sarcomere assembly.\",\n      \"method\": \"Morpholino knockdown in Xenopus, mRNA rescue with deletion and phospho-mutant constructs, sarcomere ultrastructure analysis\",\n      \"journal\": \"Developmental dynamics : an official publication of the American Association of Anatomists\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morpholino KD with structure-function rescue; context-dependent results noted by authors; single lab\",\n      \"pmids\": [\"20235223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Telethonin knockout in mice does not impair baseline heart development or function, indicating it is not indispensable for titin anchoring per se (actin-titin cross-links via α-actinin are sufficient for Z-disc stability). However, telethonin deficiency leads to heart failure after biomechanical stress, partly through elevated p53-mediated apoptosis in cardiomyocytes; telethonin modulates turnover of the proapoptotic tumor suppressor p53 in the nuclear compartment following mechanical stress.\",\n      \"method\": \"Telethonin KO mouse model, mechanical stress (aortic banding), p53 turnover assays, nuclear fractionation, cardiac function measurements\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mice plus biomechanical stress challenge plus p53 mechanistic analysis; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"21799151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Telethonin knockout mice display progressive t-tubule loss, Ca2+ transient dysynchrony, elevated Ca2+ spark frequency, and depressed L-type Ca2+ channel activity with age and after aortic banding; this identifies telethonin as a critical load-sensitive regulator of t-tubule structure and calcium-induced calcium release.\",\n      \"method\": \"Tcap KO mice, confocal t-tubule imaging, Ca2+ transient and spark measurements, aortic banding mechanical overload model\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO plus mechanical stress model plus multiple calcium imaging endpoints; mechanistic link between telethonin, t-tubule structure, and CICR established\",\n      \"pmids\": [\"23100327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Telethonin is constitutively bis-phosphorylated at Ser-157 and Ser-161 in adult rat and mouse ventricular myocardium; protein kinase D and CaMKII phosphorylate these sites in vitro. Expression of non-phosphorylatable S157A/S161A telethonin in cardiomyocytes disrupts t-tubule organization and prolongs/increases variance of intracellular Ca2+ transients, establishing that telethonin phosphorylation is required for normal t-tubule and calcium homeostasis.\",\n      \"method\": \"In vitro kinase assays, mass spectrometry, site-directed mutagenesis, phosphate affinity electrophoresis, adenoviral gene transfer, confocal imaging of t-tubules, Ca2+ transient measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with MS identification of phosphosites, mutagenesis in primary cardiomyocytes with functional readout; multiple orthogonal Tier 1–2 methods in a single study\",\n      \"pmids\": [\"24280220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CLOCK and BMAL1 transcriptional activators directly target the Tcap promoter, driving circadian oscillation of Tcap mRNA and TCAP protein in the heart; Tcap mRNA rhythmicity is blunted in Clock-mutant hearts.\",\n      \"method\": \"ChIP assay, biotinylated oligonucleotide promoter binding, luciferase reporter assay, real-time PCR in circadian mutant mice\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus promoter reporter assays; single lab, but multiple orthogonal methods confirming circadian regulation\",\n      \"pmids\": [\"25121604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Telethonin is a substrate of MuRF1 E3 ubiquitin ligase; telethonin facilitates and stabilizes MuRF1-E2 (specifically E2E1 and E2J1) complexes, and its presence governs the affinity between MuRF1 and these E2 enzymes. Co-expression of MuRF1 with these E2s in HEK293T cells leads to increased telethonin degradation.\",\n      \"method\": \"Surface plasmon resonance, yeast three-hybrid, split-GFP complementation, HEK293T co-expression degradation assay\",\n      \"journal\": \"Journal of cachexia, sarcopenia and muscle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — three orthogonal interaction assays (SPR, Y3H, split-GFP) plus functional degradation assay; rigorous multi-method single study\",\n      \"pmids\": [\"29271608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FBXL21 interacts with TCAP in skeletal muscle in a circadian manner antiphasic to TCAP accumulation; GSK-3β phosphorylates both FBXL21 and TCAP to activate phosphodegron-dependent TCAP degradation via the SCF-FBXL21 complex. GSK-3β inhibition or knockdown diminishes FBXL21-Cul1 complex formation and delays TCAP degradation. Loss of this regulatory axis (Psttm Fbxl21 hypomorph mice) causes impaired skeletal muscle fiber size, exercise tolerance, and grip strength.\",\n      \"method\": \"Co-immunoprecipitation, in vivo phosphorylation assays, GSK-3β inhibition/knockdown, Psttm mouse model, skeletal muscle functional testing\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, kinase phosphorylation assays, genetic mouse model with defined functional phenotype; multiple orthogonal methods in one study\",\n      \"pmids\": [\"32937135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TCAP variants p.E49K and p.R153H reduce peak Nav1.5 sodium current density in HEK293 cells stably expressing hNav1.5, with p.E49K also shifting the voltage dependency of steady-state inactivation leftward; these findings demonstrate TCAP modulates Nav1.5 channel function and that specific mutations cause loss-of-function of INa.\",\n      \"method\": \"Patch-clamp electrophysiology in HEK293 cells, transfection of wild-type vs. variant TCAP\",\n      \"journal\": \"Pacing and clinical electrophysiology : PACE\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct electrophysiology in heterologous expression system; single lab, confirms earlier Nav1.5 interaction finding\",\n      \"pmids\": [\"32588437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Tcap knockout zebrafish (CRISPR/Cas9) show muscular dystrophy phenotypes, abnormal mitochondria in skeletal muscle, inhibited stretch-sensing ability, altered cardiac morphology and function, increased ROS and mitophagy; impaired cardiac regeneration and cardiomyocyte proliferation after injury are rescued by ROS scavengers or autophagy inhibitors, identifying elevated ROS and autophagy as downstream effectors of Tcap deficiency.\",\n      \"method\": \"CRISPR/Cas9 knockout zebrafish, ROS measurement, mitophagy markers, cardiac regeneration assay, pharmacological rescue\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean CRISPR KO with pharmacological rescue linking ROS/autophagy to phenotype; single lab, zebrafish model\",\n      \"pmids\": [\"39226992\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TCAP/telethonin is a small (19 kDa) Z-disc protein that forms a palindromic, mechanically anisotropic sandwich complex with the N-terminal Z1Z2 immunoglobulin domains of titin to anchor titin filaments at the Z-disc periphery; it also bridges the sarcomere to T-tubule membranes by binding minK (IKs channel β-subunit) and modulates Nav1.5 sodium channel kinetics, serves as a substrate for MuRF1/SCF-FBXL21 E3 ubiquitin ligases (with GSK-3β-driven phosphodegron-dependent circadian degradation), is constitutively bis-phosphorylated at Ser-157/Ser-161 by PKD and CaMKII to maintain t-tubule organization and calcium transient fidelity, and following biomechanical stress translocates to the nucleus to modulate p53 turnover and apoptosis, with additional interactions with calsarcin-1, MLP, FATZ, BMP10, and Siva linking it to stretch-sensing signaling and cardiomyocyte survival.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TCAP (telethonin) is a small Z-disc protein that anchors titin filaments at the sarcomere periphery and serves as a mechanical and signaling hub coupling sarcomeric integrity to membrane organization and cardiomyocyte survival [#0, #17]. Its defining biochemical activity is to cross-link two N-terminal titin Z1Z2 immunoglobulin domains into a palindromic antiparallel 2:1 (titin:telethonin) sandwich, with the C-terminus mediating dimerization of these complexes and being required for sarcomere assembly in vivo [#4, #7, #16]; single-molecule force spectroscopy shows this bond is mechanically anisotropic, resisting ultra-high force only along the physiological filament axis [#13]. Telethonin sits within a broader Z-disc interaction network, binding FATZ, calsarcin-1, MLP, and BMP10, and disease-associated mutations remodel these interactions in patterns that track with hypertrophic versus dilated cardiomyopathy [#2, #5, #8]. Beyond structural anchoring, telethonin bridges the sarcomere to membrane excitability by binding the minK IKs channel beta-subunit and modulating Nav1.5 sodium channel kinetics, with TCAP variants altering INa [#3, #9, #23]. Loss-of-function studies across zebrafish, Xenopus, and mouse establish that telethonin is dispensable for baseline titin anchoring but essential for T-tubule development, calcium-induced calcium release, and resistance to biomechanical stress, where its deficiency drives heart failure through elevated nuclear p53-mediated apoptosis [#14, #16, #17, #18]. Constitutive bis-phosphorylation at Ser-157/Ser-161 by PKD and CaMKII maintains T-tubule organization and calcium transient fidelity [#19]. Telethonin abundance is dynamically controlled: it is a substrate of the MuRF1 and SCF-FBXL21 E3 ubiquitin ligases, with GSK-3beta-driven phosphodegron-dependent circadian degradation and CLOCK/BMAL1 transcriptional control conferring diurnal oscillation of its levels in muscle [#10, #20, #21, #22]. TCAP loss is also linked to dystrophic skeletal muscle and impaired cardiac regeneration through elevated ROS and autophagy [#15, #24].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established that telethonin binds the N-terminal titin Z1Z2 immunoglobulin domains and that this interaction is required for sarcomeric assembly, defining TCAP's core structural role.\",\n      \"evidence\": \"In vitro binding, yeast two-hybrid, and dominant-negative overexpression in cardiac myocytes\",\n      \"pmids\": [\"9817758\", \"9645487\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and architecture of the complex not yet resolved\", \"Whether the interaction directly anchors filaments versus assembling them not distinguished\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Placed telethonin within a multiprotein Z-disc network by identifying FATZ as a direct binding partner, beginning the mapping of its interactome.\",\n      \"evidence\": \"GST overlay assay and yeast two-hybrid\",\n      \"pmids\": [\"10984498\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single binding method\", \"Functional consequence of FATZ binding not tested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Extended telethonin's role from purely structural to membrane-coupling by showing it links myofibrillar components to the IKs channel via the minK cytoplasmic domain at T-tubular membranes.\",\n      \"evidence\": \"In vitro interaction mapping to C-terminal residues and confocal co-localization in cardiac muscle\",\n      \"pmids\": [\"11697903\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional effect on IKs current not measured\", \"Single lab\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved how telethonin organizes titin filaments by defining a 1:2 antiparallel cross-linking complex that can further dimerize, providing a structural basis for filament tethering at the Z-disc.\",\n      \"evidence\": \"Analytical ultracentrifugation and SAXS with ab initio modeling\",\n      \"pmids\": [\"12446666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution structure yet\", \"C-terminal organization unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected TCAP biochemistry to disease by showing HCM- and DCM-associated mutations differentially remodel binding to titin, calsarcin-1, and MLP, linking phenotype to altered Z-disc interactions.\",\n      \"evidence\": \"Yeast two-hybrid and GST pull-down competition assays\",\n      \"pmids\": [\"15582318\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No quantitative affinity measurements\", \"In vivo validation of mutation effects absent\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed a nuclear/degradation dimension by showing MDM2 binds telethonin, alters its localization, and promotes ubiquitin-independent proteasomal degradation, antagonized by p14ARF.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP, GST pull-down, and proteasome inhibitor assays\",\n      \"pmids\": [\"16678796\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological context of nuclear telethonin not established here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Provided the high-resolution architecture of the titin-telethonin sandwich, confirming a palindromic 2:1 assembly and identifying the disordered C-terminus as the dimerization mediator.\",\n      \"evidence\": \"X-ray crystallography, SAXS, circular dichroism, and in vivo complementation\",\n      \"pmids\": [\"16713295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"C-terminal structure undefined even when titin-bound\", \"Mechanical behavior of the bond not addressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linked telethonin to stretch-sensing signaling through direct BMP10 binding, with a cardiomyopathy-associated BMP10 variant showing reduced Tcap binding and enhanced hypertrophic effect.\",\n      \"evidence\": \"Co-IP, co-localization, and cardiomyocyte hypertrophy assay with conditioned medium\",\n      \"pmids\": [\"17921333\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct functional role of Tcap in BMP10 retention not isolated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated telethonin modulates cardiac/smooth-muscle excitability by co-immunoprecipitating with Nav1.5 and showing a patient mutation alters channel activation and window current.\",\n      \"evidence\": \"Co-IP, immunofluorescence, and patch-clamp in HEK293 cells\",\n      \"pmids\": [\"18408010\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of channel modulation not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified telethonin as a proteasome substrate during muscle atrophy and as required for myoblast differentiation, beginning to define its turnover and developmental functions.\",\n      \"evidence\": \"Ubiquitin conjugate purification with mass spectrometry; siRNA knockdown in differentiating muscle cells\",\n      \"pmids\": [\"18565784\", \"18440815\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase responsible for atrophy degradation not yet identified\", \"Knockdown effect on differentiation is RNA-level only with no protein mechanism\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linked telethonin to cardiomyocyte apoptosis during viral infection by identifying the proapoptotic protein Siva as a binding partner.\",\n      \"evidence\": \"Yeast two-hybrid screen and co-localization in CVB3-infected cardiomyocytes\",\n      \"pmids\": [\"18849585\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No biochemical confirmation of direct interaction (no Co-IP)\", \"Functional consequence not tested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the mechanical logic of the titin-telethonin bond, showing it is directionally optimized to resist ultra-high force only along the physiological filament axis.\",\n      \"evidence\": \"Single-molecule AFM force spectroscopy on reconstituted complex\",\n      \"pmids\": [\"19622741\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of anisotropy to Z-disc function inferred not directly tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Separated telethonin's role in sarcomere assembly from membrane organization in vivo, showing Tcap integrates after Z-disc periodicity is set and is required for T-tubule development, and is mechanically inducible and ILK-regulated.\",\n      \"evidence\": \"Morpholino knockdown in zebrafish with EM, immunofluorescence, and ILK epistasis\",\n      \"pmids\": [\"19679566\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling Tcap to T-tubule development unresolved\", \"Morpholino specificity caveats\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established the in vivo necessity of telethonin for muscle maintenance and the requirement of its C-terminus for sarcomere assembly, while linking Tcap loss to elevated myostatin.\",\n      \"evidence\": \"Tcap knockout mouse histology and biomechanics; Xenopus morpholino rescue with truncation and phospho-mutant constructs\",\n      \"pmids\": [\"20233748\", \"20235223\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of myostatin regulation not defined\", \"Context-dependence of phospho-mutant rescue noted by authors\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed telethonin is dispensable for baseline titin anchoring but essential for stress tolerance, acting in the nucleus to modulate p53 turnover and limit cardiomyocyte apoptosis after biomechanical stress.\",\n      \"evidence\": \"Tcap KO mice with aortic banding, p53 turnover assays, and nuclear fractionation\",\n      \"pmids\": [\"21799151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of stress-induced nuclear translocation not defined\", \"Direct biochemical link between telethonin and p53 turnover not fully resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified telethonin as a load-sensitive regulator of T-tubule structure and calcium-induced calcium release, with KO causing progressive t-tubule loss and Ca2+ handling defects under overload.\",\n      \"evidence\": \"Tcap KO mice with confocal t-tubule imaging, Ca2+ transient/spark measurements, and aortic banding\",\n      \"pmids\": [\"23100327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link from telethonin to t-tubule maintenance machinery not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined post-translational control of telethonin's membrane/calcium function, showing constitutive bis-phosphorylation at Ser-157/Ser-161 by PKD and CaMKII is required for normal t-tubule organization and Ca2+ transient fidelity.\",\n      \"evidence\": \"In vitro kinase assays, MS phosphosite mapping, phospho-mutant adenoviral transfer, and Ca2+ imaging in cardiomyocytes\",\n      \"pmids\": [\"24280220\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phosphorylation mechanistically maintains t-tubules unresolved\", \"Upstream signals controlling these kinases on telethonin not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed transcriptional circadian control of Tcap, with CLOCK/BMAL1 directly driving rhythmic Tcap expression in the heart.\",\n      \"evidence\": \"ChIP, promoter binding, luciferase reporter, and RT-PCR in circadian-mutant mice\",\n      \"pmids\": [\"25121604\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological consequence of rhythmic Tcap not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined telethonin as a MuRF1 substrate that also stabilizes MuRF1-E2 (E2E1, E2J1) complexes and governs MuRF1-E2 affinity, integrating it into atrophy-associated ubiquitination.\",\n      \"evidence\": \"Surface plasmon resonance, yeast three-hybrid, split-GFP complementation, and HEK293T degradation assay\",\n      \"pmids\": [\"29271608\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution of MuRF1-mediated turnover to muscle phenotype not isolated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified a circadian degradation axis in which GSK-3beta phosphorylates TCAP and FBXL21 to drive SCF-FBXL21 phosphodegron-dependent TCAP turnover, with loss impairing muscle fiber size and strength.\",\n      \"evidence\": \"Co-IP, in vivo phosphorylation assays, GSK-3beta inhibition/knockdown, and Psttm Fbxl21 hypomorph mouse functional testing\",\n      \"pmids\": [\"32937135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay between MuRF1 and SCF-FBXL21 control of TCAP not reconciled\", \"Phosphodegron residues' relationship to PKD/CaMKII sites unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Confirmed direct functional modulation of Nav1.5 by TCAP, showing variants p.E49K and p.R153H reduce peak INa with p.E49K shifting inactivation, establishing channel loss-of-function.\",\n      \"evidence\": \"Patch-clamp in HEK293 cells stably expressing hNav1.5 with wild-type versus variant TCAP\",\n      \"pmids\": [\"32588437\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which TCAP couples to Nav1.5 gating not defined\", \"Single lab heterologous system\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified ROS and autophagy as downstream effectors of Tcap deficiency, with mitochondrial dysfunction, impaired cardiac regeneration, and stretch-sensing defects rescued by ROS scavengers or autophagy inhibitors.\",\n      \"evidence\": \"CRISPR/Cas9 knockout zebrafish with ROS and mitophagy measurement, cardiac regeneration assay, and pharmacological rescue\",\n      \"pmids\": [\"39226992\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link from Tcap loss to ROS elevation not defined\", \"Single lab zebrafish model\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How biomechanical stress triggers telethonin nuclear translocation and the direct molecular mechanism by which it modulates p53 turnover remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No defined translocation signal or trafficking mechanism\", \"Direct telethonin-p53 biochemical relationship unresolved\", \"Integration of structural anchoring, signaling, and degradation roles into one model incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 4, 7]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 4, 7, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 9, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 4, 7, 14]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 17]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 14, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [0, 14, 15, 16]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [10, 21, 22]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [17, 24]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [20, 22]}\n    ],\n    \"complexes\": [\n      \"titin-telethonin Z-disc complex\",\n      \"Z-disc (FATZ/calsarcin/MLP network)\"\n    ],\n    \"partners\": [\n      \"TTN\",\n      \"KCNE1\",\n      \"FATZ\",\n      \"MDM2\",\n      \"BMP10\",\n      \"SCN5A\",\n      \"TRIM63\",\n      \"FBXL21\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":8,"faith_total":8,"faith_pct":100.0}}