{"gene":"TPM3","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":1995,"finding":"A missense mutation (M9R) in TPM3 encoding α-tropomyosin(slow) substitutes an arginine for a highly conserved methionine near the N-terminus in a putative actin-binding site, and was proposed to strengthen tropomyosin-actin binding, leading to nemaline rod body formation in slow (type 1) muscle fibers.","method":"Genetic linkage analysis and DNA sequencing of a nemaline myopathy family; mutation identified in a putative actin-binding motif","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic linkage plus sequencing; actin-binding mechanism inferred from sequence context but directly tested biochemically only in later papers","pmids":["7704029"],"is_preprint":false},{"year":1999,"finding":"Homozygosity for a nonsense mutation at codon 31 of TPM3 results in no functional α-tropomyosin(slow) protein; nemaline bodies were restricted exclusively to type 1 (slow) fibers, consistent with TPM3 expression only in type 1 fibers, establishing fiber-type-specific expression as essential to disease pathology.","method":"SSCP and DNA sequencing; muscle biopsy immunohistochemistry demonstrating fiber-type restriction of nemaline bodies","journal":"Neuromuscular disorders : NMD","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — sequencing plus histological fiber-type analysis, single lab","pmids":["10619715"],"is_preprint":false},{"year":1999,"finding":"In anaplastic large cell lymphoma with t(1;2)(q25;p23), TPM3 fuses to ALK, producing a constitutively expressed TPM3-ALK chimeric protein that is restricted to the cytoplasm; the TPM3 coiled-coil domain mediates homodimerization of the fusion protein, leading to constitutive activation of ALK kinase.","method":"RT-PCR walking strategy to identify fusion partner; immunohistochemistry showing cytoplasmic ALK localization; mechanistic inference of homodimerization from TPM3 protein-protein interaction domain","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RT-PCR cloning and IHC; dimerization mechanism inferred, not directly assayed in this paper","pmids":["10216106"],"is_preprint":false},{"year":2000,"finding":"TPM3-ALK and TPM4-ALK oncoproteins (~95 kDa) are characterized by constitutive ALK kinase activity and tyrosyl-phosphorylation; the N-terminal coiled-coil domains of tropomyosin fused to the ALK C-terminal kinase domain drive constitutive activation.","method":"Cloning of fusion genes; immunohistochemistry and immunoprecipitation demonstrating constitutive kinase activity and tyrosyl-phosphorylation","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — cloning, kinase activity assay, and phosphorylation analysis; replicated across two fusion proteins in same study","pmids":["10934142"],"is_preprint":false},{"year":2007,"finding":"TPM3-ALK expression specifically induces changes in cell morphology and cytoskeleton organisation, and confers higher metastatic capacity than other ALK fusion proteins; co-immunoprecipitation demonstrated a specific interaction between TPM3-ALK and endogenous tropomyosin.","method":"Experimental lung metastasis assay in mice; co-immunoprecipitation of TPM3-ALK with endogenous tropomyosin; cell morphology analysis","journal":"European journal of cancer (Oxford, England : 1990)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus in vivo metastasis assay, single lab","pmids":["17276053"],"is_preprint":false},{"year":2008,"finding":"The M9R mutation in TPM3 causes nemaline bodies restricted to atrophied type 1 fibers; α-tropomyosin(slow) is not expressed at significant levels until after birth; wild-type and M9R mutant α-tropomyosin(slow) form heterodimers in equal ratio (dominant-negative); M9R greatly reduced binding affinity of tropomodulin for α-tropomyosin(slow) compared to wild-type; M9R mutant reduced incorporation into stress fibers and disrupted filamentous actin networks in transfected myoblasts.","method":"Protein analysis (isoelectric focusing, 2D-PAGE); far Western blot for tropomodulin binding; transfection of mutant and wild-type constructs into myoblasts; immunofluorescence","journal":"Journal of neuropathology and experimental neurology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (far Western, 2D-PAGE, transfection/actin imaging) in single rigorous study","pmids":["18716557"],"is_preprint":false},{"year":2010,"finding":"2D-gel electrophoresis of patient muscle showed that mutant α-tropomyosin(slow) accounts for ~50% of α-tropomyosin(slow) in sarcomeres in patients with p.R168C TPM3 mutation, consistent with a dominant-negative mechanism of disease pathogenesis.","method":"2D-gel electrophoresis of patient muscle biopsies","journal":"Neuromuscular disorders : NMD","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein quantification from patient muscle, single lab","pmids":["20554445"],"is_preprint":false},{"year":2011,"finding":"TPM3 (and TPM4) gene products localize specifically to the postsynaptic region (not presynaptic) in mouse hippocampal neurons, establishing isoform-specific segregation to distinct actin filament populations at CNS synapses.","method":"Immunofluorescence localization in mouse hippocampal neurons; comparison with pre- and postsynaptic markers","journal":"Bioarchitecture","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by immunofluorescence, replicated across TPM3 and TPM4, single lab","pmids":["22545181"],"is_preprint":false},{"year":2014,"finding":"TPM3-NTRK1 rearrangement produces a constitutively active chimeric TPM3-TRKA kinase in colorectal carcinoma cell line KM12; TRKA kinase inhibitor NMS-P626 suppressed TPM3-TRKA phosphorylation and downstream signaling, confirming constitutive kinase activation by the fusion.","method":"Genomic characterization of rearrangement; phosphorylation assay with TRKA inhibitor; in vivo tumor model","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase phosphorylation assay and in vivo model, single lab","pmids":["24962792"],"is_preprint":false},{"year":2014,"finding":"Non-muscle Tpm3 protein localizes at the cortex of mouse oocytes during germinal vesicle and GVB stages; knockdown of Tpm3 impaired asymmetric division, spindle migration, reduced cortical actin, and caused membrane blebbing; Tpm3 protects cortical actin from cofilin-mediated depolymerization.","method":"Immunostaining, siRNA knockdown, overexpression of constitutively active cofilin mutant in mouse oocytes; confocal imaging of actin","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD plus OE rescue with defined cellular phenotype, single lab","pmids":["25483187"],"is_preprint":false},{"year":2015,"finding":"Oncogenic TPM3-ALK activation requires dimerization mediated through the coiled-coil structure of TPM3; longer TPM3 regions led to higher dimer formation (BN-PAGE); phosphorylation of ALK, ERK1/2, and STAT3 depended on TPM3-ALK dimerization; NIH3T3 cells expressing full-length TPM3-ALK lost contact inhibition (focus formation) while ALK alone did not transform.","method":"Lentiviral expression of truncation constructs; Blue-native PAGE (BN-PAGE) for dimerization; Western blot for phosphorylation; focus formation assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution with deletion series, BN-PAGE for dimerization, kinase activity assay, and transformation assay in single study","pmids":["25596129"],"is_preprint":false},{"year":2015,"finding":"Muscle weakness in TPM3-myopathy patients is directly attributable to reduced Ca2+-sensitivity and impaired acto-myosin cross-bridge cycling kinetics specifically in slow (type 1) myofibers; co-sedimentation assays showed reduced binding of mutant R168C α-tropomyosin(slow) to filamentous actin; at physiological [Ca2+], patient slow fibers produced only 26% of control force; fast fibers were spared.","method":"Single fiber contractility studies; co-sedimentation actin-binding assay; 2D-PAGE; molecular modelling","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro actin binding assay, single fiber contractility, and 2D-PAGE with multiple orthogonal methods in one study","pmids":["26307083"],"is_preprint":false},{"year":2016,"finding":"Tpm3.1 (a TPM3 isoform) undergoes continuous dynamic exchange in actin filament bundles; FRAP analysis showed 50-70% mobile fraction; exchange of Tpm3.1 is largely independent of actin filament assembly/turnover (jasplakinolide stabilization of actin did not significantly affect Tpm3.1 exchange).","method":"FRAP analysis of fluorescently tagged Tpm3.1 in cultured cells and in vivo (intravital microscopy in rats); treatment with jasplakinolide","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRAP in both cell culture and in vivo, single lab, two experimental systems","pmids":["27977753"],"is_preprint":false},{"year":2020,"finding":"Tpm3.1 (TPM3 isoform) co-localizes with actin patches at the axon initial segment (AIS); pharmacological inhibition of Tpm3.1 reduced density of actin patches, disrupted periodicity of sub-membranous actin rings, reduced accumulation of AIS structural/functional proteins, disrupted axonal/somatodendritic protein sorting, and reduced neuronal firing frequency.","method":"Immunofluorescence co-localization; pharmacological Tpm3.1 inhibition; electrophysiology; live imaging","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with functional consequences via inhibition, single lab, multiple readouts","pmids":["32344377"],"is_preprint":false},{"year":2021,"finding":"Knockout of Tpm3 in hippocampal neurons decreased neurite length and complexity; deletion of C-terminal residues of Tpm3.1 impaired its association with stress fibers and its segregation to neurite tips, and abolished its ability to maintain the filamentous actin pool at axonal growth cones.","method":"Primary neurons from Tpm3 knockout mice; morphometric analysis; expression of C-terminal truncation mutants; immunofluorescence","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO and domain-deletion rescue, single lab, multiple morphological and localization readouts","pmids":["33807093"],"is_preprint":false},{"year":2021,"finding":"M9R mutation in Tpm3.12 impairs acto-myosin cross-bridge cycling; at molecular level, M9R reduces tropomodulin affinity for α-tropomyosin(slow) and disrupts cofilin-2 inhibition; E151A mutation alters Ca2+-sensitivity of thin filaments; K169E mutation directly affects tropomyosin dimer structure-function; γγ-homodimers and γβ-heterodimers show distinct responses depending on which chain carries the mutation.","method":"Recombinant protein production; actin co-sedimentation; in vitro ATPase assay; polarized fluorescence microscopy of reconstituted thin filaments in ghost fibers","journal":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with multiple mutations, ATPase assay, and structural fluorescence microscopy","pmids":["32797717"],"is_preprint":false},{"year":2021,"finding":"Five low molecular weight TPM3 isoforms (Tpm3.1, 3.2, 3.4, 3.5, 3.7) differ in actin-binding and structural properties depending on alternatively spliced exon 6 (6a or 6b) and C-terminal exon 9 (9a, 9c, or 9d), demonstrating that alternative splicing determines distinct cytoskeletal functions.","method":"Biochemical characterization including CD spectroscopy, thermal stability assays, actin co-sedimentation of recombinant isoforms","journal":"Archives of biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution, single lab","pmids":["34339666"],"is_preprint":false},{"year":2022,"finding":"Tpm3.1 (TPM3 isoform) associates with F-actin in tenocytes; Tpm3.1 inhibition reduces F-actin levels in tendons, decreases tenogenic gene expression, increases chondrogenic and protease (MMP-3) expression, consistent with tendinosis progression; mechanical stress deprivation reduces F-actin through downregulation of Tpm3.1.","method":"G/F-actin ratio assay; pharmacological Tpm3.1 inhibition in mouse and human tenocytes and ex vivo tendon explants; RT-PCR for gene expression","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct actin association assay plus functional KD in primary cells and explants, single lab","pmids":["36129771"],"is_preprint":false},{"year":2022,"finding":"PCBP1 (PolyC-RNA-binding protein 1) directly binds the 3'UTR of TPM3 mRNA (verified by RNA immunoprecipitation) and stabilizes TPM3 mRNA; PCBP1 knockdown reduced TPM3 mRNA stability (accelerated degradation after actinomycin D treatment), and reduced TPM3-dependent migration and invasion in ESCC cells.","method":"RNA-protein immunoprecipitation (RIP); actinomycin D mRNA stability assay; Western blot; migration/invasion assays","journal":"Bioengineered","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RIP binding assay plus functional mRNA stability assay, single lab","pmids":["35287546"],"is_preprint":false},{"year":2023,"finding":"Troponin complex inhibits cofilin-2-mediated severing and depolymerization of actin filaments decorated with Tpm3.12; the myopathy-causing R91C variant of Tpm3.12 was more resistant to removal by cofilin-2 and more strongly inhibited cofilin-2-dependent actin filament turnover compared to wild-type, indicating the pathogenic variant impairs actin filament dynamics.","method":"In vitro actin co-sedimentation; pyrene actin depolymerization assays; cofilin-2 severing assay with recombinant proteins","journal":"International journal of molecular sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with recombinant proteins, multiple assay types, single lab","pmids":["38003645"],"is_preprint":false},{"year":2024,"finding":"RNF20 recruits TPM3 to both centromeres and spindle poles during acentrosomal meiotic spindle assembly in mouse oocytes; this recruitment is mediated by RNF20's coiled-coil motif (not its E3 ligase activity); RNF20-depleted oocytes show abnormal spindle and chromosome misalignment that can be attributed to loss of TPM3 recruitment.","method":"Co-immunoprecipitation; localization by immunofluorescence; RNF20 depletion and E3 ligase-dead mutant rescue in mouse oocytes","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional rescue with domain mutants, single lab","pmids":["38240347"],"is_preprint":false},{"year":2024,"finding":"TPM3 overexpression attenuated hypoxia-induced morphological changes, cytoskeletal disruption, oxidative stress, and LDH release in cardiomyocytes; TPM3 knockdown exacerbated these effects; HDAC1 inhibitor (MGCD0103) partially reversed the exacerbation caused by TPM3 knockdown, linking TPM3 to HDAC1-regulated cytoskeletal stability.","method":"Lentiviral TPM3 overexpression and knockdown in AC16/H9c2 cells; CoCl2 hypoxia model; LDH, MDA, SOD assays; HDAC1 inhibitor treatment","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and OE with defined biochemical readouts and pharmacological rescue, single lab","pmids":["38928503"],"is_preprint":false},{"year":1995,"finding":"The TPM3 gene was localized to chromosome 1q22→q23 by FISH, placing it in close proximity to NTRK1 (1q23→q24) and within the NEM1 locus, establishing the chromosomal basis for the recurring TPM3-NTRK1 intrachromosomal inversion in papillary thyroid carcinoma.","method":"Fluorescence in situ hybridization (FISH) using sequence-tagged sites","journal":"Cytogenetics and cell genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct FISH localization, single lab","pmids":["7956350"],"is_preprint":false},{"year":1995,"finding":"TPM3-NTRK1 gene fusion results from an intrachromosomal inversion at chromosome 1; the chimeric protein (70 kDa) consists of the 221 N-terminal residues of TPM3 fused to NTRK1, is constitutively phosphorylated on tyrosine, and identical breakpoints produce an invariable transcript in all tumors.","method":"Genomic sequencing of breakpoints; RT-PCR; tyrosine phosphorylation detection","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genomic sequencing of breakpoints combined with constitutive phosphorylation demonstrated in multiple patient tumors","pmids":["7590742"],"is_preprint":false}],"current_model":"TPM3 encodes α-tropomyosin(slow), a coiled-coil actin-binding protein that regulates thin filament function in slow (type 1) skeletal muscle fibers by controlling Ca2+-sensitivity and acto-myosin cross-bridge cycling; pathogenic mutations cause dominant-negative disruption of actin-tropomyosin interaction (with reduced actin binding, altered cofilin-2-dependent filament turnover, and disrupted tropomodulin binding), leading to slow fiber-specific weakness and congenital myopathy; in non-muscle cells, specific TPM3 isoforms (especially Tpm3.1) stabilize distinct F-actin subpopulations at the axon initial segment, neuronal growth cones, oocyte cortex, and tendon stress fibers; chromosomal rearrangements fusing TPM3's N-terminal coiled-coil domain to tyrosine kinase domains (ALK, NTRK1, ROS1) create constitutively active oncoproteins through TPM3-driven dimerization."},"narrative":{"mechanistic_narrative":"TPM3 encodes α-tropomyosin(slow), a coiled-coil actin-binding protein that regulates thin-filament function in slow (type 1) skeletal muscle fibers and stabilizes distinct F-actin populations in non-muscle cells [PMID:26307083, PMID:33807093]. In muscle, TPM3 governs Ca2+-sensitivity and acto-myosin cross-bridge cycling specifically in type 1 fibers, and pathogenic mutations act dominant-negatively: heterozygous mutant protein incorporates into sarcomeres at roughly equal ratio with wild-type [PMID:20554445], reducing actin-binding affinity, weakening tropomodulin binding, and disrupting cofilin-2-dependent thin-filament turnover, producing slow-fiber-specific weakness and nemaline rod bodies [PMID:18716557, PMID:26307083, PMID:32797717, PMID:38003645]. Because α-tropomyosin(slow) is expressed only in type 1 fibers, disease pathology is restricted to that fiber type while fast fibers are spared [PMID:10619715, PMID:26307083]. Distinct low-molecular-weight TPM3 isoforms generated by alternative splicing of exon 6 and the C-terminal exon 9 have divergent actin-binding and structural properties [PMID:34339666]; among these, Tpm3.1 stabilizes specific F-actin subpopulations at the axon initial segment, neuronal growth cones, the oocyte cortex, and tendon stress fibers, protecting these filaments from cofilin-mediated depolymerization [PMID:25483187, PMID:32344377, PMID:33807093, PMID:36129771]. TPM3 mRNA is stabilized by PCBP1 binding to its 3'UTR [PMID:35287546], and during acentrosomal meiotic spindle assembly TPM3 is recruited to centromeres and spindle poles via the coiled-coil motif of RNF20 [PMID:38240347]. Independently of its normal function, the TPM3 N-terminal coiled-coil domain drives constitutive activation of fused tyrosine kinases: chromosomal rearrangements producing TPM3-ALK and TPM3-NTRK1 (TRKA) chimeras generate cytoplasmic, constitutively tyrosine-phosphorylated oncoproteins whose kinase activity and transforming capacity depend on TPM3-mediated dimerization [PMID:10216106, PMID:10934142, PMID:25596129, PMID:7590742].","teleology":[{"year":1995,"claim":"Establishing that TPM3 mutations cause congenital myopathy linked the gene to thin-filament regulation in muscle and pinpointed an N-terminal actin-binding residue as disease-critical.","evidence":"Genetic linkage and sequencing of a nemaline myopathy family identifying the M9R missense substitution","pmids":["7704029"],"confidence":"Medium","gaps":["Actin-binding effect inferred from sequence context, not directly assayed","Did not explain fiber-type restriction of pathology"]},{"year":1995,"claim":"Mapping TPM3 to 1q22-q23 next to NTRK1, and sequencing the TPM3-NTRK1 inversion breakpoint, revealed that TPM3's N-terminus can be fused to a tyrosine kinase to create a constitutively phosphorylated oncoprotein.","evidence":"FISH chromosomal localization and genomic breakpoint sequencing with tyrosine-phosphorylation detection in thyroid carcinoma","pmids":["7956350","7590742"],"confidence":"High","gaps":["Mechanism of constitutive kinase activation not defined","Did not test transforming capacity directly"]},{"year":1999,"claim":"A null TPM3 allele and fiber-type-restricted nemaline bodies established that disease pathology tracks the type 1 fiber-specific expression of α-tropomyosin(slow); concurrently TPM3-ALK was identified as a recurrent cytoplasmic fusion in lymphoma.","evidence":"Sequencing plus muscle immunohistochemistry of a homozygous nonsense mutation; RT-PCR cloning and IHC of t(1;2) TPM3-ALK","pmids":["10619715","10216106"],"confidence":"Medium","gaps":["Dimerization mechanism of TPM3-ALK inferred, not assayed","Did not biochemically test how loss of protein causes rods"]},{"year":2000,"claim":"Demonstrating that the tropomyosin N-terminal coiled-coil fused to the ALK kinase domain confers constitutive kinase activity defined the molecular basis of TPM3-driven oncogenesis.","evidence":"Cloning of TPM3-ALK and TPM4-ALK fusions with kinase activity and tyrosyl-phosphorylation assays","pmids":["10934142"],"confidence":"High","gaps":["Dimerization not directly measured","Downstream signaling pathways not mapped"]},{"year":2007,"claim":"Showing that TPM3-ALK interacts with endogenous tropomyosin and confers higher metastatic capacity connected the fusion's biology to cytoskeletal organization.","evidence":"Reciprocal co-immunoprecipitation and in vivo lung metastasis assay in mice","pmids":["17276053"],"confidence":"Medium","gaps":["Mechanistic link between tropomyosin interaction and metastasis not resolved","Single lab"]},{"year":2008,"claim":"Defining the dominant-negative biochemistry of M9R — equal-ratio heterodimer formation, reduced tropomodulin binding, and disrupted actin networks — explained how a single mutant allele causes disease.","evidence":"2D-PAGE, far Western for tropomodulin, and myoblast transfection/immunofluorescence","pmids":["18716557"],"confidence":"High","gaps":["Did not measure contractile consequence in fibers","Did not address Ca2+-sensitivity directly"]},{"year":2010,"claim":"Quantifying that mutant protein constitutes ~50% of sarcomeric α-tropomyosin(slow) in patient muscle confirmed dominant-negative incorporation in vivo for a second mutation.","evidence":"2D-gel electrophoresis of R168C patient muscle biopsies","pmids":["20554445"],"confidence":"Medium","gaps":["Did not link protein ratio to force deficit","Single patient cohort"]},{"year":2011,"claim":"Postsynaptic localization of TPM3 in hippocampal neurons established that specific isoforms segregate to distinct actin populations in non-muscle, CNS contexts.","evidence":"Immunofluorescence localization versus pre/postsynaptic markers in mouse neurons","pmids":["22545181"],"confidence":"Medium","gaps":["Functional role at synapses not tested","Isoform identity not fully resolved"]},{"year":2014,"claim":"Identifying a constitutively active TPM3-TRKA fusion sensitive to TRKA inhibition extended the oncogenic fusion paradigm to colorectal carcinoma and provided a druggable target.","evidence":"Genomic characterization plus TRKA-inhibitor phosphorylation assay and in vivo tumor model in KM12 cells","pmids":["24962792"],"confidence":"Medium","gaps":["Dimerization not directly tested for this fusion","Single cell-line origin"]},{"year":2014,"claim":"Cortical localization and knockdown phenotypes in oocytes showed non-muscle Tpm3 protects cortical actin from cofilin-mediated depolymerization to enable asymmetric division.","evidence":"Immunostaining, siRNA knockdown, and constitutively active cofilin overexpression in mouse oocytes","pmids":["25483187"],"confidence":"Medium","gaps":["Specific isoform not identified","Direct biochemistry of cofilin protection not shown here"]},{"year":2015,"claim":"Direct dimerization mapping established that oncogenic TPM3-ALK activation and transformation require the coiled-coil, with longer regions promoting dimer formation and downstream signaling.","evidence":"Truncation series, BN-PAGE dimerization assay, phospho-Western, and focus formation in NIH3T3","pmids":["25596129"],"confidence":"High","gaps":["Structural basis of dimer-driven kinase activation not solved","Other fusion partners not compared"]},{"year":2015,"claim":"Linking reduced actin binding to a measurable contractile deficit specifically in slow fibers connected molecular defect to physiology of weakness.","evidence":"Single-fiber contractility, actin co-sedimentation, 2D-PAGE, and modelling of R168C","pmids":["26307083"],"confidence":"High","gaps":["Did not resolve why fast fibers tolerate the protein","Cofilin turnover not addressed in this study"]},{"year":2016,"claim":"FRAP showing dynamic Tpm3.1 exchange largely uncoupled from actin turnover defined tropomyosin as an independently regulated decoration on filaments.","evidence":"FRAP in cultured cells and intravital microscopy with jasplakinolide treatment","pmids":["27977753"],"confidence":"Medium","gaps":["Regulators of exchange not identified","Mechanism of exchange unknown"]},{"year":2020,"claim":"Tpm3.1 was shown to be required for axon-initial-segment actin patches and periodic actin rings, coupling a specific isoform to neuronal protein sorting and excitability.","evidence":"Immunofluorescence co-localization, pharmacological Tpm3.1 inhibition, and electrophysiology","pmids":["32344377"],"confidence":"Medium","gaps":["Inhibitor specificity caveats","Direct molecular partners at AIS not defined"]},{"year":2021,"claim":"Knockout and C-terminal truncation studies established that the Tpm3.1 C-terminus drives stress-fiber and growth-cone actin maintenance required for neurite outgrowth, while in vitro reconstitution mapped distinct mutation mechanisms (tropomodulin affinity, cofilin-2 inhibition, Ca2+-sensitivity, dimer structure) and splice-isoform-specific actin properties.","evidence":"Tpm3 KO neurons with domain-deletion rescue; recombinant protein ATPase/co-sedimentation/polarized fluorescence; CD spectroscopy of isoforms","pmids":["33807093","32797717","34339666"],"confidence":"High","gaps":["In vivo relevance of isoform diversity not fully tested","Combined effects of multiple regulators not reconstituted together"]},{"year":2022,"claim":"Demonstrating Tpm3.1-dependent F-actin maintenance in tenocytes and PCBP1-mediated TPM3 mRNA stabilization expanded TPM3's roles to tendon homeostasis and post-transcriptional regulation in cancer cell migration.","evidence":"G/F-actin assay with Tpm3.1 inhibition in tenocytes/explants; RIP and actinomycin D mRNA-stability assays with migration/invasion readouts in ESCC","pmids":["36129771","35287546"],"confidence":"Medium","gaps":["Upstream control of Tpm3.1 expression under mechanical load incomplete","PCBP1-TPM3 axis tested in single cancer context"]},{"year":2023,"claim":"Reconstitution showed troponin and Tpm3.12 together inhibit cofilin-2 severing, and the R91C myopathy variant abnormally over-inhibits filament turnover, linking pathogenic mutation to defective actin dynamics.","evidence":"In vitro co-sedimentation, pyrene depolymerization, and cofilin-2 severing assays with recombinant proteins","pmids":["38003645"],"confidence":"High","gaps":["In vivo confirmation in patient muscle absent","Did not connect altered turnover to force deficit directly"]},{"year":2024,"claim":"RNF20-mediated recruitment of TPM3 to centromeres and spindle poles and TPM3's protective role in hypoxic cardiomyocytes broadened its functions to meiotic spindle assembly and cytoskeletal stress protection.","evidence":"Co-IP and RNF20 depletion/E3-dead rescue in oocytes; TPM3 OE/KD with HDAC1-inhibitor rescue in cardiomyocyte hypoxia model","pmids":["38240347","38928503"],"confidence":"Medium","gaps":["Isoform mediating spindle recruitment not specified","TPM3-HDAC1 mechanistic link not resolved"]},{"year":null,"claim":"How isoform-specific TPM3 decoration is targeted to and dynamically regulated across its many distinct F-actin populations, and how this integrates with binding partners (tropomodulin, cofilin-2, troponin, RNF20), remains incompletely defined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying structural model of isoform-specific filament selection","Regulators directing Tpm3.1 to specific cellular sites unknown","Mechanistic basis for fiber-type and tissue specificity not fully resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[5,11,15,16,17,19]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[11,13,14]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[11,15,19]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[5,12,14,17]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,3]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[20]}],"pathway":[{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[11,15]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,3,23]}],"complexes":["thin filament"],"partners":["ALK","NTRK1","TROPOMODULIN","COFILIN-2","TROPONIN","RNF20","PCBP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P06753","full_name":"Tropomyosin alpha-3 chain","aliases":["Gamma-tropomyosin","Tropomyosin-3","Tropomyosin-5","hTM5"],"length_aa":285,"mass_kda":33.0,"function":"Binds to actin filaments in muscle and non-muscle cells. Plays a central role, in association with the troponin complex, in the calcium dependent regulation of vertebrate striated muscle contraction. Smooth muscle contraction is regulated by interaction with caldesmon. 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oryzae.","date":"2023","source":"aBIOTECH","url":"https://pubmed.ncbi.nlm.nih.gov/37581021","citation_count":6,"is_preprint":false},{"pmid":"39813766","id":"PMC_39813766","title":"Renal cell carcinoma with ALK-TPM3 gene fusion and ALK amplification: A case report and literature review.","date":"2025","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/39813766","citation_count":6,"is_preprint":false},{"pmid":"38141768","id":"PMC_38141768","title":"The Saccharomyces cerevisiae Spo7 basic tail is required for Nem1-Spo7/Pah1 phosphatase cascade function in lipid synthesis.","date":"2023","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38141768","citation_count":6,"is_preprint":false},{"pmid":"38240347","id":"PMC_38240347","title":"RNF20 Regulates Oocyte Meiotic Spindle Assembly by Recruiting TPM3 to Centromeres and Spindle Poles.","date":"2024","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/38240347","citation_count":6,"is_preprint":false},{"pmid":"36092346","id":"PMC_36092346","title":"MiR-107 inhibits the malignant biological behavior of esophageal squamous cell carcinoma by targeting TPM3.","date":"2022","source":"Journal of gastrointestinal oncology","url":"https://pubmed.ncbi.nlm.nih.gov/36092346","citation_count":6,"is_preprint":false},{"pmid":"35251641","id":"PMC_35251641","title":"A rare case of recurrent ovarian cancer with TPM3-NTRK1 gene rearrangement: A case report.","date":"2022","source":"Molecular and clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/35251641","citation_count":6,"is_preprint":false},{"pmid":"34204776","id":"PMC_34204776","title":"Molecular Mechanisms of the Deregulation of Muscle Contraction Induced by the R90P Mutation in Tpm3.12 and the Weakening of This Effect by BDM and W7.","date":"2021","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/34204776","citation_count":6,"is_preprint":false},{"pmid":"33768912","id":"PMC_33768912","title":"α-tropomyosin gene (TPM3) mutation in an infant with nemaline myopathy.","date":"2021","source":"Clinical case reports","url":"https://pubmed.ncbi.nlm.nih.gov/33768912","citation_count":6,"is_preprint":false},{"pmid":"31828041","id":"PMC_31828041","title":"Genomic Profiling Reveals Synchronous Bilateral Lung Adenocarcinomas With Distinct Driver Alterations of EML4-ALK or TPM3-ROS1 Fusion: A Case Report.","date":"2019","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/31828041","citation_count":5,"is_preprint":false},{"pmid":"38003645","id":"PMC_38003645","title":"Troponin and a Myopathy-Linked Mutation in TPM3 Inhibit Cofilin-2-Induced Thin Filament Depolymerization.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38003645","citation_count":4,"is_preprint":false},{"pmid":"36982903","id":"PMC_36982903","title":"Molecular Mechanisms of Deregulation of Muscle Contractility Caused by the R168H Mutation in TPM3 and Its Attenuation by Therapeutic Agents.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36982903","citation_count":4,"is_preprint":false},{"pmid":"35688744","id":"PMC_35688744","title":"Novel autosomal dominant TPM3 mutation causes a combined congenital fibre type disproportion-cap disease histological pattern.","date":"2022","source":"Neuromuscular disorders : NMD","url":"https://pubmed.ncbi.nlm.nih.gov/35688744","citation_count":4,"is_preprint":false},{"pmid":"37895119","id":"PMC_37895119","title":"Comparative Genomics Identifies the Evolutionarily Conserved Gene TPM3 as a Target of eca-miR-1 Involved in the Skeletal Muscle Development of Donkeys.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/37895119","citation_count":4,"is_preprint":false},{"pmid":"29752871","id":"PMC_29752871","title":"Small molecule targeting of the actin associating protein tropomyosin Tpm3.1 increases neuroblastoma cell response to inhibition of Rac-mediated multicellular invasion.","date":"2018","source":"Cytoskeleton (Hoboken, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/29752871","citation_count":4,"is_preprint":false},{"pmid":"30207315","id":"PMC_30207315","title":"A putative NEM1 homologue regulates lipid droplet biogenesis via PAH1 in Tetrahymena thermophila.","date":"2018","source":"Journal of biosciences","url":"https://pubmed.ncbi.nlm.nih.gov/30207315","citation_count":4,"is_preprint":false},{"pmid":"32283206","id":"PMC_32283206","title":"Demonstration of beta-tropomyosin (Tpm2) and duplication of the alpha-slow tropomyosin gene (TPM3) in Atlantic salmon Salmo salar.","date":"2020","source":"Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/32283206","citation_count":4,"is_preprint":false},{"pmid":"37305396","id":"PMC_37305396","title":"LncRNA WEE2-AS1 knockdown inhibits the proliferation, migration and invasion of glioma cells via regulating miR-29b-2-5p/TPM3 axis.","date":"2022","source":"Oncology research","url":"https://pubmed.ncbi.nlm.nih.gov/37305396","citation_count":4,"is_preprint":false},{"pmid":"32580284","id":"PMC_32580284","title":"Molecular Mechanisms of Muscle Weakness Associated with E173A Mutation in Tpm3.12. Troponin Ca2+ Sensitivity Inhibitor W7 Can Reduce the Damaging Effect of This Mutation.","date":"2020","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32580284","citation_count":4,"is_preprint":false},{"pmid":"31155291","id":"PMC_31155291","title":"The molecular mechanisms of a high Ca2+-sensitivity and muscle weakness associated with the Ala155Thr substitution in Tpm3.12.","date":"2019","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/31155291","citation_count":4,"is_preprint":false},{"pmid":"38357202","id":"PMC_38357202","title":"Case report: Adult NTRK-rearranged spindle cell neoplasms with TPM3-NTRK1 fusion in the pelvic.","date":"2024","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/38357202","citation_count":3,"is_preprint":false},{"pmid":"34291143","id":"PMC_34291143","title":"The R168G heterozygous mutation of tropomyosin 3 (TPM3) was identified in three family members and has manifestations ranging from asymptotic to serve scoliosis and respiratory complications.","date":"2020","source":"Genes & diseases","url":"https://pubmed.ncbi.nlm.nih.gov/34291143","citation_count":3,"is_preprint":false},{"pmid":"35393008","id":"PMC_35393008","title":"LncRNA WEE2-AS1 Knockdown Inhibits the Proliferation, Migration and 3 Invasion of Glioma Cells via Regulating miR-29b-2-5p/TPM3 Axis.","date":"2022","source":"Oncology research","url":"https://pubmed.ncbi.nlm.nih.gov/35393008","citation_count":3,"is_preprint":false},{"pmid":"23924754","id":"PMC_23924754","title":"Is mutation p.Arg168Gly in TPM3 gene responsible for Type 1 fiber hypoplasia and cap structure formation?","date":"2014","source":"Clinical neuropathology","url":"https://pubmed.ncbi.nlm.nih.gov/23924754","citation_count":3,"is_preprint":false},{"pmid":"40491214","id":"PMC_40491214","title":"Late Recurrence of Spindle Cell Sarcoma in Association with TPM3::NTRK1 Fusion.","date":"2025","source":"International journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/40491214","citation_count":2,"is_preprint":false},{"pmid":"35796944","id":"PMC_35796944","title":"Transcript-Based Diagnosis and Expanded Phenotype of an Intronic Mutation in TPM3 Myopathy.","date":"2022","source":"Molecular diagnosis & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/35796944","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48185,"output_tokens":5941,"usd":0.116835,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14615,"output_tokens":5447,"usd":0.104625,"stage2_stop_reason":"end_turn"},"total_usd":0.22146,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"A missense mutation (M9R) in TPM3 encoding α-tropomyosin(slow) substitutes an arginine for a highly conserved methionine near the N-terminus in a putative actin-binding site, and was proposed to strengthen tropomyosin-actin binding, leading to nemaline rod body formation in slow (type 1) muscle fibers.\",\n      \"method\": \"Genetic linkage analysis and DNA sequencing of a nemaline myopathy family; mutation identified in a putative actin-binding motif\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic linkage plus sequencing; actin-binding mechanism inferred from sequence context but directly tested biochemically only in later papers\",\n      \"pmids\": [\"7704029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Homozygosity for a nonsense mutation at codon 31 of TPM3 results in no functional α-tropomyosin(slow) protein; nemaline bodies were restricted exclusively to type 1 (slow) fibers, consistent with TPM3 expression only in type 1 fibers, establishing fiber-type-specific expression as essential to disease pathology.\",\n      \"method\": \"SSCP and DNA sequencing; muscle biopsy immunohistochemistry demonstrating fiber-type restriction of nemaline bodies\",\n      \"journal\": \"Neuromuscular disorders : NMD\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sequencing plus histological fiber-type analysis, single lab\",\n      \"pmids\": [\"10619715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In anaplastic large cell lymphoma with t(1;2)(q25;p23), TPM3 fuses to ALK, producing a constitutively expressed TPM3-ALK chimeric protein that is restricted to the cytoplasm; the TPM3 coiled-coil domain mediates homodimerization of the fusion protein, leading to constitutive activation of ALK kinase.\",\n      \"method\": \"RT-PCR walking strategy to identify fusion partner; immunohistochemistry showing cytoplasmic ALK localization; mechanistic inference of homodimerization from TPM3 protein-protein interaction domain\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RT-PCR cloning and IHC; dimerization mechanism inferred, not directly assayed in this paper\",\n      \"pmids\": [\"10216106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TPM3-ALK and TPM4-ALK oncoproteins (~95 kDa) are characterized by constitutive ALK kinase activity and tyrosyl-phosphorylation; the N-terminal coiled-coil domains of tropomyosin fused to the ALK C-terminal kinase domain drive constitutive activation.\",\n      \"method\": \"Cloning of fusion genes; immunohistochemistry and immunoprecipitation demonstrating constitutive kinase activity and tyrosyl-phosphorylation\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — cloning, kinase activity assay, and phosphorylation analysis; replicated across two fusion proteins in same study\",\n      \"pmids\": [\"10934142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TPM3-ALK expression specifically induces changes in cell morphology and cytoskeleton organisation, and confers higher metastatic capacity than other ALK fusion proteins; co-immunoprecipitation demonstrated a specific interaction between TPM3-ALK and endogenous tropomyosin.\",\n      \"method\": \"Experimental lung metastasis assay in mice; co-immunoprecipitation of TPM3-ALK with endogenous tropomyosin; cell morphology analysis\",\n      \"journal\": \"European journal of cancer (Oxford, England : 1990)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus in vivo metastasis assay, single lab\",\n      \"pmids\": [\"17276053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The M9R mutation in TPM3 causes nemaline bodies restricted to atrophied type 1 fibers; α-tropomyosin(slow) is not expressed at significant levels until after birth; wild-type and M9R mutant α-tropomyosin(slow) form heterodimers in equal ratio (dominant-negative); M9R greatly reduced binding affinity of tropomodulin for α-tropomyosin(slow) compared to wild-type; M9R mutant reduced incorporation into stress fibers and disrupted filamentous actin networks in transfected myoblasts.\",\n      \"method\": \"Protein analysis (isoelectric focusing, 2D-PAGE); far Western blot for tropomodulin binding; transfection of mutant and wild-type constructs into myoblasts; immunofluorescence\",\n      \"journal\": \"Journal of neuropathology and experimental neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (far Western, 2D-PAGE, transfection/actin imaging) in single rigorous study\",\n      \"pmids\": [\"18716557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"2D-gel electrophoresis of patient muscle showed that mutant α-tropomyosin(slow) accounts for ~50% of α-tropomyosin(slow) in sarcomeres in patients with p.R168C TPM3 mutation, consistent with a dominant-negative mechanism of disease pathogenesis.\",\n      \"method\": \"2D-gel electrophoresis of patient muscle biopsies\",\n      \"journal\": \"Neuromuscular disorders : NMD\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein quantification from patient muscle, single lab\",\n      \"pmids\": [\"20554445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TPM3 (and TPM4) gene products localize specifically to the postsynaptic region (not presynaptic) in mouse hippocampal neurons, establishing isoform-specific segregation to distinct actin filament populations at CNS synapses.\",\n      \"method\": \"Immunofluorescence localization in mouse hippocampal neurons; comparison with pre- and postsynaptic markers\",\n      \"journal\": \"Bioarchitecture\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by immunofluorescence, replicated across TPM3 and TPM4, single lab\",\n      \"pmids\": [\"22545181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TPM3-NTRK1 rearrangement produces a constitutively active chimeric TPM3-TRKA kinase in colorectal carcinoma cell line KM12; TRKA kinase inhibitor NMS-P626 suppressed TPM3-TRKA phosphorylation and downstream signaling, confirming constitutive kinase activation by the fusion.\",\n      \"method\": \"Genomic characterization of rearrangement; phosphorylation assay with TRKA inhibitor; in vivo tumor model\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase phosphorylation assay and in vivo model, single lab\",\n      \"pmids\": [\"24962792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Non-muscle Tpm3 protein localizes at the cortex of mouse oocytes during germinal vesicle and GVB stages; knockdown of Tpm3 impaired asymmetric division, spindle migration, reduced cortical actin, and caused membrane blebbing; Tpm3 protects cortical actin from cofilin-mediated depolymerization.\",\n      \"method\": \"Immunostaining, siRNA knockdown, overexpression of constitutively active cofilin mutant in mouse oocytes; confocal imaging of actin\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD plus OE rescue with defined cellular phenotype, single lab\",\n      \"pmids\": [\"25483187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Oncogenic TPM3-ALK activation requires dimerization mediated through the coiled-coil structure of TPM3; longer TPM3 regions led to higher dimer formation (BN-PAGE); phosphorylation of ALK, ERK1/2, and STAT3 depended on TPM3-ALK dimerization; NIH3T3 cells expressing full-length TPM3-ALK lost contact inhibition (focus formation) while ALK alone did not transform.\",\n      \"method\": \"Lentiviral expression of truncation constructs; Blue-native PAGE (BN-PAGE) for dimerization; Western blot for phosphorylation; focus formation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution with deletion series, BN-PAGE for dimerization, kinase activity assay, and transformation assay in single study\",\n      \"pmids\": [\"25596129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Muscle weakness in TPM3-myopathy patients is directly attributable to reduced Ca2+-sensitivity and impaired acto-myosin cross-bridge cycling kinetics specifically in slow (type 1) myofibers; co-sedimentation assays showed reduced binding of mutant R168C α-tropomyosin(slow) to filamentous actin; at physiological [Ca2+], patient slow fibers produced only 26% of control force; fast fibers were spared.\",\n      \"method\": \"Single fiber contractility studies; co-sedimentation actin-binding assay; 2D-PAGE; molecular modelling\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro actin binding assay, single fiber contractility, and 2D-PAGE with multiple orthogonal methods in one study\",\n      \"pmids\": [\"26307083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tpm3.1 (a TPM3 isoform) undergoes continuous dynamic exchange in actin filament bundles; FRAP analysis showed 50-70% mobile fraction; exchange of Tpm3.1 is largely independent of actin filament assembly/turnover (jasplakinolide stabilization of actin did not significantly affect Tpm3.1 exchange).\",\n      \"method\": \"FRAP analysis of fluorescently tagged Tpm3.1 in cultured cells and in vivo (intravital microscopy in rats); treatment with jasplakinolide\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP in both cell culture and in vivo, single lab, two experimental systems\",\n      \"pmids\": [\"27977753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Tpm3.1 (TPM3 isoform) co-localizes with actin patches at the axon initial segment (AIS); pharmacological inhibition of Tpm3.1 reduced density of actin patches, disrupted periodicity of sub-membranous actin rings, reduced accumulation of AIS structural/functional proteins, disrupted axonal/somatodendritic protein sorting, and reduced neuronal firing frequency.\",\n      \"method\": \"Immunofluorescence co-localization; pharmacological Tpm3.1 inhibition; electrophysiology; live imaging\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with functional consequences via inhibition, single lab, multiple readouts\",\n      \"pmids\": [\"32344377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Knockout of Tpm3 in hippocampal neurons decreased neurite length and complexity; deletion of C-terminal residues of Tpm3.1 impaired its association with stress fibers and its segregation to neurite tips, and abolished its ability to maintain the filamentous actin pool at axonal growth cones.\",\n      \"method\": \"Primary neurons from Tpm3 knockout mice; morphometric analysis; expression of C-terminal truncation mutants; immunofluorescence\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO and domain-deletion rescue, single lab, multiple morphological and localization readouts\",\n      \"pmids\": [\"33807093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"M9R mutation in Tpm3.12 impairs acto-myosin cross-bridge cycling; at molecular level, M9R reduces tropomodulin affinity for α-tropomyosin(slow) and disrupts cofilin-2 inhibition; E151A mutation alters Ca2+-sensitivity of thin filaments; K169E mutation directly affects tropomyosin dimer structure-function; γγ-homodimers and γβ-heterodimers show distinct responses depending on which chain carries the mutation.\",\n      \"method\": \"Recombinant protein production; actin co-sedimentation; in vitro ATPase assay; polarized fluorescence microscopy of reconstituted thin filaments in ghost fibers\",\n      \"journal\": \"FASEB journal : official publication of the Federation of American Societies for Experimental Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with multiple mutations, ATPase assay, and structural fluorescence microscopy\",\n      \"pmids\": [\"32797717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Five low molecular weight TPM3 isoforms (Tpm3.1, 3.2, 3.4, 3.5, 3.7) differ in actin-binding and structural properties depending on alternatively spliced exon 6 (6a or 6b) and C-terminal exon 9 (9a, 9c, or 9d), demonstrating that alternative splicing determines distinct cytoskeletal functions.\",\n      \"method\": \"Biochemical characterization including CD spectroscopy, thermal stability assays, actin co-sedimentation of recombinant isoforms\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution, single lab\",\n      \"pmids\": [\"34339666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Tpm3.1 (TPM3 isoform) associates with F-actin in tenocytes; Tpm3.1 inhibition reduces F-actin levels in tendons, decreases tenogenic gene expression, increases chondrogenic and protease (MMP-3) expression, consistent with tendinosis progression; mechanical stress deprivation reduces F-actin through downregulation of Tpm3.1.\",\n      \"method\": \"G/F-actin ratio assay; pharmacological Tpm3.1 inhibition in mouse and human tenocytes and ex vivo tendon explants; RT-PCR for gene expression\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct actin association assay plus functional KD in primary cells and explants, single lab\",\n      \"pmids\": [\"36129771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PCBP1 (PolyC-RNA-binding protein 1) directly binds the 3'UTR of TPM3 mRNA (verified by RNA immunoprecipitation) and stabilizes TPM3 mRNA; PCBP1 knockdown reduced TPM3 mRNA stability (accelerated degradation after actinomycin D treatment), and reduced TPM3-dependent migration and invasion in ESCC cells.\",\n      \"method\": \"RNA-protein immunoprecipitation (RIP); actinomycin D mRNA stability assay; Western blot; migration/invasion assays\",\n      \"journal\": \"Bioengineered\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RIP binding assay plus functional mRNA stability assay, single lab\",\n      \"pmids\": [\"35287546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Troponin complex inhibits cofilin-2-mediated severing and depolymerization of actin filaments decorated with Tpm3.12; the myopathy-causing R91C variant of Tpm3.12 was more resistant to removal by cofilin-2 and more strongly inhibited cofilin-2-dependent actin filament turnover compared to wild-type, indicating the pathogenic variant impairs actin filament dynamics.\",\n      \"method\": \"In vitro actin co-sedimentation; pyrene actin depolymerization assays; cofilin-2 severing assay with recombinant proteins\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with recombinant proteins, multiple assay types, single lab\",\n      \"pmids\": [\"38003645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RNF20 recruits TPM3 to both centromeres and spindle poles during acentrosomal meiotic spindle assembly in mouse oocytes; this recruitment is mediated by RNF20's coiled-coil motif (not its E3 ligase activity); RNF20-depleted oocytes show abnormal spindle and chromosome misalignment that can be attributed to loss of TPM3 recruitment.\",\n      \"method\": \"Co-immunoprecipitation; localization by immunofluorescence; RNF20 depletion and E3 ligase-dead mutant rescue in mouse oocytes\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional rescue with domain mutants, single lab\",\n      \"pmids\": [\"38240347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TPM3 overexpression attenuated hypoxia-induced morphological changes, cytoskeletal disruption, oxidative stress, and LDH release in cardiomyocytes; TPM3 knockdown exacerbated these effects; HDAC1 inhibitor (MGCD0103) partially reversed the exacerbation caused by TPM3 knockdown, linking TPM3 to HDAC1-regulated cytoskeletal stability.\",\n      \"method\": \"Lentiviral TPM3 overexpression and knockdown in AC16/H9c2 cells; CoCl2 hypoxia model; LDH, MDA, SOD assays; HDAC1 inhibitor treatment\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and OE with defined biochemical readouts and pharmacological rescue, single lab\",\n      \"pmids\": [\"38928503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The TPM3 gene was localized to chromosome 1q22→q23 by FISH, placing it in close proximity to NTRK1 (1q23→q24) and within the NEM1 locus, establishing the chromosomal basis for the recurring TPM3-NTRK1 intrachromosomal inversion in papillary thyroid carcinoma.\",\n      \"method\": \"Fluorescence in situ hybridization (FISH) using sequence-tagged sites\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct FISH localization, single lab\",\n      \"pmids\": [\"7956350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"TPM3-NTRK1 gene fusion results from an intrachromosomal inversion at chromosome 1; the chimeric protein (70 kDa) consists of the 221 N-terminal residues of TPM3 fused to NTRK1, is constitutively phosphorylated on tyrosine, and identical breakpoints produce an invariable transcript in all tumors.\",\n      \"method\": \"Genomic sequencing of breakpoints; RT-PCR; tyrosine phosphorylation detection\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genomic sequencing of breakpoints combined with constitutive phosphorylation demonstrated in multiple patient tumors\",\n      \"pmids\": [\"7590742\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TPM3 encodes α-tropomyosin(slow), a coiled-coil actin-binding protein that regulates thin filament function in slow (type 1) skeletal muscle fibers by controlling Ca2+-sensitivity and acto-myosin cross-bridge cycling; pathogenic mutations cause dominant-negative disruption of actin-tropomyosin interaction (with reduced actin binding, altered cofilin-2-dependent filament turnover, and disrupted tropomodulin binding), leading to slow fiber-specific weakness and congenital myopathy; in non-muscle cells, specific TPM3 isoforms (especially Tpm3.1) stabilize distinct F-actin subpopulations at the axon initial segment, neuronal growth cones, oocyte cortex, and tendon stress fibers; chromosomal rearrangements fusing TPM3's N-terminal coiled-coil domain to tyrosine kinase domains (ALK, NTRK1, ROS1) create constitutively active oncoproteins through TPM3-driven dimerization.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TPM3 encodes α-tropomyosin(slow), a coiled-coil actin-binding protein that regulates thin-filament function in slow (type 1) skeletal muscle fibers and stabilizes distinct F-actin populations in non-muscle cells [#11, #14]. In muscle, TPM3 governs Ca2+-sensitivity and acto-myosin cross-bridge cycling specifically in type 1 fibers, and pathogenic mutations act dominant-negatively: heterozygous mutant protein incorporates into sarcomeres at roughly equal ratio with wild-type [#6], reducing actin-binding affinity, weakening tropomodulin binding, and disrupting cofilin-2-dependent thin-filament turnover, producing slow-fiber-specific weakness and nemaline rod bodies [#5, #11, #15, #19]. Because α-tropomyosin(slow) is expressed only in type 1 fibers, disease pathology is restricted to that fiber type while fast fibers are spared [#1, #11]. Distinct low-molecular-weight TPM3 isoforms generated by alternative splicing of exon 6 and the C-terminal exon 9 have divergent actin-binding and structural properties [#16]; among these, Tpm3.1 stabilizes specific F-actin subpopulations at the axon initial segment, neuronal growth cones, the oocyte cortex, and tendon stress fibers, protecting these filaments from cofilin-mediated depolymerization [#9, #13, #14, #17]. TPM3 mRNA is stabilized by PCBP1 binding to its 3'UTR [#18], and during acentrosomal meiotic spindle assembly TPM3 is recruited to centromeres and spindle poles via the coiled-coil motif of RNF20 [#20]. Independently of its normal function, the TPM3 N-terminal coiled-coil domain drives constitutive activation of fused tyrosine kinases: chromosomal rearrangements producing TPM3-ALK and TPM3-NTRK1 (TRKA) chimeras generate cytoplasmic, constitutively tyrosine-phosphorylated oncoproteins whose kinase activity and transforming capacity depend on TPM3-mediated dimerization [#2, #3, #10, #23].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing that TPM3 mutations cause congenital myopathy linked the gene to thin-filament regulation in muscle and pinpointed an N-terminal actin-binding residue as disease-critical.\",\n      \"evidence\": \"Genetic linkage and sequencing of a nemaline myopathy family identifying the M9R missense substitution\",\n      \"pmids\": [\"7704029\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Actin-binding effect inferred from sequence context, not directly assayed\", \"Did not explain fiber-type restriction of pathology\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Mapping TPM3 to 1q22-q23 next to NTRK1, and sequencing the TPM3-NTRK1 inversion breakpoint, revealed that TPM3's N-terminus can be fused to a tyrosine kinase to create a constitutively phosphorylated oncoprotein.\",\n      \"evidence\": \"FISH chromosomal localization and genomic breakpoint sequencing with tyrosine-phosphorylation detection in thyroid carcinoma\",\n      \"pmids\": [\"7956350\", \"7590742\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of constitutive kinase activation not defined\", \"Did not test transforming capacity directly\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"A null TPM3 allele and fiber-type-restricted nemaline bodies established that disease pathology tracks the type 1 fiber-specific expression of α-tropomyosin(slow); concurrently TPM3-ALK was identified as a recurrent cytoplasmic fusion in lymphoma.\",\n      \"evidence\": \"Sequencing plus muscle immunohistochemistry of a homozygous nonsense mutation; RT-PCR cloning and IHC of t(1;2) TPM3-ALK\",\n      \"pmids\": [\"10619715\", \"10216106\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dimerization mechanism of TPM3-ALK inferred, not assayed\", \"Did not biochemically test how loss of protein causes rods\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrating that the tropomyosin N-terminal coiled-coil fused to the ALK kinase domain confers constitutive kinase activity defined the molecular basis of TPM3-driven oncogenesis.\",\n      \"evidence\": \"Cloning of TPM3-ALK and TPM4-ALK fusions with kinase activity and tyrosyl-phosphorylation assays\",\n      \"pmids\": [\"10934142\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dimerization not directly measured\", \"Downstream signaling pathways not mapped\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showing that TPM3-ALK interacts with endogenous tropomyosin and confers higher metastatic capacity connected the fusion's biology to cytoskeletal organization.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation and in vivo lung metastasis assay in mice\",\n      \"pmids\": [\"17276053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between tropomyosin interaction and metastasis not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defining the dominant-negative biochemistry of M9R — equal-ratio heterodimer formation, reduced tropomodulin binding, and disrupted actin networks — explained how a single mutant allele causes disease.\",\n      \"evidence\": \"2D-PAGE, far Western for tropomodulin, and myoblast transfection/immunofluorescence\",\n      \"pmids\": [\"18716557\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not measure contractile consequence in fibers\", \"Did not address Ca2+-sensitivity directly\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Quantifying that mutant protein constitutes ~50% of sarcomeric α-tropomyosin(slow) in patient muscle confirmed dominant-negative incorporation in vivo for a second mutation.\",\n      \"evidence\": \"2D-gel electrophoresis of R168C patient muscle biopsies\",\n      \"pmids\": [\"20554445\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not link protein ratio to force deficit\", \"Single patient cohort\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Postsynaptic localization of TPM3 in hippocampal neurons established that specific isoforms segregate to distinct actin populations in non-muscle, CNS contexts.\",\n      \"evidence\": \"Immunofluorescence localization versus pre/postsynaptic markers in mouse neurons\",\n      \"pmids\": [\"22545181\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role at synapses not tested\", \"Isoform identity not fully resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying a constitutively active TPM3-TRKA fusion sensitive to TRKA inhibition extended the oncogenic fusion paradigm to colorectal carcinoma and provided a druggable target.\",\n      \"evidence\": \"Genomic characterization plus TRKA-inhibitor phosphorylation assay and in vivo tumor model in KM12 cells\",\n      \"pmids\": [\"24962792\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dimerization not directly tested for this fusion\", \"Single cell-line origin\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Cortical localization and knockdown phenotypes in oocytes showed non-muscle Tpm3 protects cortical actin from cofilin-mediated depolymerization to enable asymmetric division.\",\n      \"evidence\": \"Immunostaining, siRNA knockdown, and constitutively active cofilin overexpression in mouse oocytes\",\n      \"pmids\": [\"25483187\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific isoform not identified\", \"Direct biochemistry of cofilin protection not shown here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Direct dimerization mapping established that oncogenic TPM3-ALK activation and transformation require the coiled-coil, with longer regions promoting dimer formation and downstream signaling.\",\n      \"evidence\": \"Truncation series, BN-PAGE dimerization assay, phospho-Western, and focus formation in NIH3T3\",\n      \"pmids\": [\"25596129\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of dimer-driven kinase activation not solved\", \"Other fusion partners not compared\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linking reduced actin binding to a measurable contractile deficit specifically in slow fibers connected molecular defect to physiology of weakness.\",\n      \"evidence\": \"Single-fiber contractility, actin co-sedimentation, 2D-PAGE, and modelling of R168C\",\n      \"pmids\": [\"26307083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve why fast fibers tolerate the protein\", \"Cofilin turnover not addressed in this study\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"FRAP showing dynamic Tpm3.1 exchange largely uncoupled from actin turnover defined tropomyosin as an independently regulated decoration on filaments.\",\n      \"evidence\": \"FRAP in cultured cells and intravital microscopy with jasplakinolide treatment\",\n      \"pmids\": [\"27977753\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Regulators of exchange not identified\", \"Mechanism of exchange unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Tpm3.1 was shown to be required for axon-initial-segment actin patches and periodic actin rings, coupling a specific isoform to neuronal protein sorting and excitability.\",\n      \"evidence\": \"Immunofluorescence co-localization, pharmacological Tpm3.1 inhibition, and electrophysiology\",\n      \"pmids\": [\"32344377\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Inhibitor specificity caveats\", \"Direct molecular partners at AIS not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Knockout and C-terminal truncation studies established that the Tpm3.1 C-terminus drives stress-fiber and growth-cone actin maintenance required for neurite outgrowth, while in vitro reconstitution mapped distinct mutation mechanisms (tropomodulin affinity, cofilin-2 inhibition, Ca2+-sensitivity, dimer structure) and splice-isoform-specific actin properties.\",\n      \"evidence\": \"Tpm3 KO neurons with domain-deletion rescue; recombinant protein ATPase/co-sedimentation/polarized fluorescence; CD spectroscopy of isoforms\",\n      \"pmids\": [\"33807093\", \"32797717\", \"34339666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of isoform diversity not fully tested\", \"Combined effects of multiple regulators not reconstituted together\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating Tpm3.1-dependent F-actin maintenance in tenocytes and PCBP1-mediated TPM3 mRNA stabilization expanded TPM3's roles to tendon homeostasis and post-transcriptional regulation in cancer cell migration.\",\n      \"evidence\": \"G/F-actin assay with Tpm3.1 inhibition in tenocytes/explants; RIP and actinomycin D mRNA-stability assays with migration/invasion readouts in ESCC\",\n      \"pmids\": [\"36129771\", \"35287546\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream control of Tpm3.1 expression under mechanical load incomplete\", \"PCBP1-TPM3 axis tested in single cancer context\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Reconstitution showed troponin and Tpm3.12 together inhibit cofilin-2 severing, and the R91C myopathy variant abnormally over-inhibits filament turnover, linking pathogenic mutation to defective actin dynamics.\",\n      \"evidence\": \"In vitro co-sedimentation, pyrene depolymerization, and cofilin-2 severing assays with recombinant proteins\",\n      \"pmids\": [\"38003645\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo confirmation in patient muscle absent\", \"Did not connect altered turnover to force deficit directly\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"RNF20-mediated recruitment of TPM3 to centromeres and spindle poles and TPM3's protective role in hypoxic cardiomyocytes broadened its functions to meiotic spindle assembly and cytoskeletal stress protection.\",\n      \"evidence\": \"Co-IP and RNF20 depletion/E3-dead rescue in oocytes; TPM3 OE/KD with HDAC1-inhibitor rescue in cardiomyocyte hypoxia model\",\n      \"pmids\": [\"38240347\", \"38928503\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Isoform mediating spindle recruitment not specified\", \"TPM3-HDAC1 mechanistic link not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How isoform-specific TPM3 decoration is targeted to and dynamically regulated across its many distinct F-actin populations, and how this integrates with binding partners (tropomodulin, cofilin-2, troponin, RNF20), remains incompletely defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying structural model of isoform-specific filament selection\", \"Regulators directing Tpm3.1 to specific cellular sites unknown\", \"Mechanistic basis for fiber-type and tissue specificity not fully resolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [5, 11, 15, 16, 17, 19]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [11, 13, 14]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [11, 15, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [5, 12, 14, 17]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [11, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 3, 23]}\n    ],\n    \"complexes\": [\"thin filament\"],\n    \"partners\": [\"ALK\", \"NTRK1\", \"tropomodulin\", \"cofilin-2\", \"troponin\", \"RNF20\", \"PCBP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}