{"gene":"FLNC","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2000,"finding":"FLNC (FLN2/filamin 2) was identified as a gamma- and delta-sarcoglycan interacting protein using yeast two-hybrid screening, establishing it as a component of the dystrophin-glycoprotein complex in skeletal muscle. FLN2 protein localization was found to be altered in limb-girdle muscular dystrophy and Duchenne muscular dystrophy patients and mice compared to unaffected individuals.","method":"Yeast two-hybrid screen, immunofluorescence localization in patient and mouse tissue","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus immunolocalization in patient tissue, single lab, two orthogonal methods","pmids":["10629222"],"is_preprint":false},{"year":1998,"finding":"Full-length FLNC (ABPL) was cloned and characterized as a 2,705 amino acid (~289 kDa) actin-binding protein containing an N-terminal actin-binding domain followed by 24 tandem immunoglobulin-like repeats, two hinge regions (Hinge I and Hinge II), and a unique 82-amino-acid insertion in repeat 20 absent in other filamin paralogues. An alternatively spliced isoform lacking Hinge I (~286 kDa) was identified by RT-PCR.","method":"cDNA cloning, RT-PCR, sequence analysis, comparison with genomic DNA","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — full-length cDNA characterization with RT-PCR isoform validation, single lab, multiple methods","pmids":["9791010"],"is_preprint":false},{"year":2000,"finding":"The genomic structure of FLNC was determined: 48 exons and 47 introns spanning approximately 29.5 kb, with a unique exon 40A not present in FLNA or FLNB. FLNC was precisely mapped to chromosome 7q32.","method":"Genomic cloning, restriction mapping, sequence analysis","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic sequencing and mapping, single lab","pmids":["11153914"],"is_preprint":false},{"year":2006,"finding":"Loss of FLNc function in C2C12 myoblasts (via stable RNAi knockdown) caused defects in myoblast differentiation and fusion, resulting in multinucleated 'myoballs' rather than elongated myotubes. FLNc-deficient mice (deletion of last 8 exons) died shortly after birth due to respiratory failure, with severely reduced birth weights, fewer muscle fibers and primary myotubes, variation in fiber size, and centrally located nuclei, indicating an essential role in primary myogenesis and myotube structural integrity. A TRIO-FLNc-dependent pathway was implicated in maintaining myotube structure, based on phenotypic similarity between FLNc-deficient and TRIO-deficient cells.","method":"Stable RNAi knockdown in C2C12 cells, knockout mouse model (exon deletion), phenotypic analysis, genetic epistasis comparison with TRIO-null cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function in both cell culture and mouse model, epistasis with TRIO pathway, multiple orthogonal approaches in one study","pmids":["16914736"],"is_preprint":false},{"year":2010,"finding":"FLNC was identified as a binding partner of IGFN1 (Immunoglobulin-like and fibronectin type 3 domain-containing 1) by yeast two-hybrid screening, and KY, IGFN1, and FLNC were shown to form a Z-band associated protein complex in skeletal muscle by combined yeast two-hybrid, biochemical, and immunofluorescence data.","method":"Yeast two-hybrid screen, biochemical co-purification, immunofluorescence","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus immunofluorescence, single lab, multiple orthogonal methods","pmids":["20206623"],"is_preprint":false},{"year":2012,"finding":"In FLNC mutation-associated myofibrillar myopathy, immunofluorescence studies of patient skeletal muscle revealed altered expression of chaperone proteins and components of proteasomal and autophagic degradation pathways specifically in muscle fibers with protein aggregates, suggesting dysfunction of protein quality control mechanisms as pathogenic driver.","method":"Immunofluorescence on patient muscle biopsy sections","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct immunofluorescence in patient tissue, single lab, single method but consistent across multiple patient samples","pmids":["23238331"],"is_preprint":false},{"year":2016,"finding":"Expression of the FLNCW2710X mutant protein in zebrafish revealed that the mutant protein localizes correctly to the Z-disk and can rescue fiber disintegration caused by FLNC knockdown, demonstrating that functional domains required for muscle integrity are intact in the mutant. However, the mutant forms protein aggregates that sequester FLNC away from the Z-disk, causing myofibrillar disintegration through protein insufficiency. BAG3 is recruited to aggregates but does not degrade them via chaperone-assisted selective autophagy (CASA); instead, BAG3 recruitment blocks alternative autophagy pathways that would otherwise clear aggregates. Reducing BAG3 levels or stimulating autophagy could relieve this blockage.","method":"Fluorescently tagged overexpression in zebrafish, FLNC knockdown rescue assay, immunofluorescence, BAG3 manipulation","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reconstitution/rescue experiment in zebrafish combined with multiple orthogonal methods (overexpression, knockdown rescue, BAG3 manipulation), identifying specific pathway mechanism","pmids":["26969713"],"is_preprint":false},{"year":2016,"finding":"HSPB7 interacts with dimerized FLNC, as shown by co-immunoprecipitation. Skeletal-muscle-specific ablation of HspB7 caused FLNC aggregation and mislocalization in muscle, demonstrating that HSPB7 is required to maintain proper FLNC localization and prevent myopathy progression. Loss of HSPB7 also caused abnormal upregulation and mislocalization of γ- and δ-sarcoglycan (but not dystrophin) in muscle.","method":"Co-immunoprecipitation (HSPB7 with dimerized FLNC), conditional knockout mouse (muscle-specific HspB7 deletion), immunofluorescence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction confirmed by Co-IP plus knockout mouse phenotype showing mislocalization, two orthogonal methods, direct functional consequence","pmids":["26929074"],"is_preprint":false},{"year":2016,"finding":"Western blot analysis of cardiac tissue from a patient with FLNC splice variant showed decreased FLNC protein level, supporting haploinsufficiency as the mechanism of DCM pathogenesis. Morpholino knockdown of filamin Cb (ortholog) in zebrafish resulted in abnormal cardiac function and ultrastructure, providing in vivo evidence for the haploinsufficiency model.","method":"Western blot on patient cardiac tissue, zebrafish morpholino knockdown with cardiac phenotyping","journal":"JACC. Basic to translational science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient protein analysis plus in vivo zebrafish model, single lab, two orthogonal approaches","pmids":["28008423"],"is_preprint":false},{"year":2016,"finding":"Cytoplasmic aggregates of filamin C were observed in transfected myoblast cell lines expressing the missense mutant FLNC (p.S1624L), and immunohistochemistry of heart tissue confirmed filamin C-specific cytoplasmic inclusions in patients, establishing that missense mutations in FLNC can cause protein aggregation distinct from the haploinsufficiency mechanism of truncating mutations.","method":"Transfection of myoblast cell lines with mutant FLNC, immunohistochemistry on patient cardiac tissue","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — cell transfection plus patient tissue IHC, single lab, two orthogonal methods","pmids":["26666891"],"is_preprint":false},{"year":2017,"finding":"Immunohistochemical analysis of cardiac tissue from a patient with the FLNC p.V2297M variant showed diminished FLNC localization at the Z-disk while localization at the intercalated disk was preserved. Stem cell-derived cardiomyocytes carrying the p.V2297M variant had diminished contractile activity compared to controls, establishing that the variant disrupts Z-disk targeting and contractile function.","method":"Immunohistochemistry on patient cardiac tissue, stem cell-derived cardiomyocyte contractility assay","journal":"Circulation. Cardiovascular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization in patient tissue plus iPSC-cardiomyocyte functional assay, single lab, two orthogonal methods","pmids":["29212899"],"is_preprint":false},{"year":2016,"finding":"Expression of the FLNC p.Tyr1216Asn mutant protein in NIH3T3 cells produced filamin C aggregates, while Western blot showed normal filamin C protein levels in patient muscle biopsies, demonstrating that this missense mutation causes aggregate formation without reducing total protein expression.","method":"Transfection of NIH3T3 cells, Western blot on patient muscle biopsies","journal":"Revue neurologique","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, transfection in non-muscle cells, limited functional follow-up","pmids":["27633507"],"is_preprint":false},{"year":2018,"finding":"FLNC missense variants localized in Ig-loop segments (p.A1186V and p.A1183L) were shown to be pathogenic by cellular studies (protein aggregation in transfected cells) and in vivo zebrafish modeling, which showed phenotypic abnormalities. This established that FLNC missense variants in Ig-loop segments predominantly cause restrictive cardiomyopathy via aggregate formation rather than haploinsufficiency.","method":"Transfection of cells with mutant FLNC, zebrafish in vivo modeling, morphological studies","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell transfection plus zebrafish in vivo validation, single lab, multiple orthogonal approaches","pmids":["29858533"],"is_preprint":false},{"year":2021,"finding":"A frameshift mutation in the FLNC dimerization domain (p.K2676Pfs*3) produced a mutant FLNc protein that is misfolded, unstable, and incapable of forming homodimers or heterodimers with wild-type FLNc, as shown by interaction and transfection studies with biophysical analysis. Proteomic profiling of protein aggregates in patient muscle showed activation of the ubiquitin-proteasome system and autophagic pathways, indicating dysregulation of protein quality control.","method":"Interaction assays (dimerization), transfection studies, biophysical molecular analysis, proteomic profiling of muscle aggregates","journal":"Neurology. Genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biophysical dimerization assay plus proteomics of patient tissue plus transfection, multiple orthogonal methods establishing specific molecular defect","pmids":["34235269"],"is_preprint":false},{"year":2022,"finding":"Adult-specific cardiac RNAi depletion of Drosophila Filamin (dFil, the FLNC ortholog) caused cardiac dilatation, impaired systolic function, and sarcomeric alterations, establishing that filamin is required for cardiac function and maintenance of sarcomere integrity in the adult stage. Deletion of the last four Ig-like domains of dFil was dispensable for cardiac function.","method":"Drosophila cardiac-specific RNAi knockdown, CRISPR/Cas9 domain deletion, cardiac functional assays","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo cardiac RNAi loss-of-function with domain deletion analysis in Drosophila model, single lab","pmids":["36066120"],"is_preprint":false},{"year":2024,"finding":"FLNC is ubiquitinated and subjected to proteasomal degradation by the MAGED2-TRIM28 E3 ubiquitin ligase complex. MAGED2 interacts with TRIM28 to enhance its ubiquitin ligase activity, and the complex targets FLNC for ubiquitination. Loss of FLNC downstream of this complex activates epithelial-to-mesenchymal transition (EMT), contributing to chemoresistance in triple-negative breast cancer.","method":"Biochemical assays (co-IP of MAGED2-TRIM28-FLNC complex), ubiquitination assay, proteasomal degradation assay, in vitro and in vivo functional experiments","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of three-component complex with functional ubiquitination assay and in vivo validation, single lab","pmids":["41310667"],"is_preprint":false},{"year":2024,"finding":"FLNC expression increases dramatically during osteoclast differentiation. Inhibition of FLNC suppressed markers of osteoclast differentiation (TRAP, NFATc1, c-Fos) and bone resorption activity. S6K kinase regulates FLNC expression, and FLNC interacts with integrin β3 (ITGβ3) in osteoclasts; inhibiting S6K with PF-4708671 reduced FLNC expression and the FLNC-ITGβ3 interaction. This established an S6K/FLNC/ITGβ3 signaling axis in osteoclastogenesis.","method":"Transcriptomics, RT-PCR, Western blot, adenoviral overexpression/knockdown, proteomics, S6K inhibitor treatment, ovariectomized mouse model","journal":"Phytomedicine : international journal of phytotherapy and phytopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (transcriptomics, proteomics, functional knockdown, in vivo model), single lab","pmids":["39612888"],"is_preprint":false},{"year":2024,"finding":"The FLNC p.Ala1186Val variant is located in the interstrand loop involved in intradomain stabilization and Ig-like domain interactions. 3D structural modeling showed local structural changes causing protein instability and aggregation in the form of cytoplasmic bodies. Myopathological studies showed prominent aggregation and upregulation of aggrephagy-associated proteins LC3B and p62 in patient muscle, demonstrating that protein aggregation with impaired aggrephagy underlies the disease mechanism.","method":"3D protein structural modeling, immunohistochemistry/immunofluorescence on patient muscle, bioinformatics structural analysis","journal":"Biomedicines","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — structural modeling plus patient tissue analysis, single lab, two complementary methods","pmids":["38397924"],"is_preprint":false},{"year":2024,"finding":"iPSC-derived cardiomyocytes from patients carrying FLNC R1267Q (arrhythmogenic cardiomyopathy-associated) versus V2264M (restrictive cardiomyopathy-associated) variants showed distinct molecular phenotypes: R1267Q caused greater disturbances in calcium dynamics, Nav1.5 kinetics, and action potentials compared to V2264M, accompanied by transcriptome changes in genes linked to action potential and sodium transport, establishing variant-specific effects on electrophysiology and calcium homeostasis.","method":"iPSC-derived cardiomyocytes from patients, calcium imaging, electrophysiology (patch clamp), transcriptomics","journal":"Cytoskeleton (Hoboken, N.J.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — iPSC-cardiomyocyte functional assays with multiple electrophysiological readouts plus transcriptomics, single lab","pmids":["39315490"],"is_preprint":false},{"year":2020,"finding":"The recombinant FLNC p.Pro442Arg mutant protein (homozygous in a patient with congenital-onset myopathy) was shown to be less stable and more prone to degradation by proteolytic enzymes than wild-type FLNC in biochemical assays, establishing reduced protein stability as the molecular consequence of this mutation.","method":"Recombinant protein expression, proteolytic stability assay, proteomics of patient muscle","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro recombinant protein proteolytic stability assay plus patient proteomics, single lab","pmids":["32516863"],"is_preprint":false}],"current_model":"FLNC encodes filamin C, a muscle-specific large actin-binding and crosslinking protein that localizes to Z-disks and intercalated disks in striated muscle, where it interacts with γ/δ-sarcoglycans, IGFN1/KY complex, and HSPB7 to maintain sarcomere integrity and myotube structure; loss-of-function (haploinsufficiency via truncating mutations) causes dilated and arrhythmogenic cardiomyopathies, while missense mutations in Ig-loop domains cause protein misfolding, dimerization failure, and aggregate formation that sequesters FLNC from the Z-disk and impairs autophagy/proteasomal clearance, producing myofibrillar myopathy and restrictive or hypertrophic cardiomyopathies; additionally, FLNC is targeted for ubiquitination and proteasomal degradation by the MAGED2-TRIM28 E3 ligase complex, and participates in an S6K/FLNC/ITGβ3 signaling axis in osteoclastogenesis."},"narrative":{"mechanistic_narrative":"FLNC encodes filamin C, a muscle-specific actin-binding and crosslinking protein built from an N-terminal actin-binding domain followed by 24 tandem immunoglobulin-like repeats, two hinge regions, and a paralog-unique insertion in repeat 20 [PMID:9791010]. It is essential for striated muscle: loss of FLNc function blocks myoblast differentiation and fusion into elongated myotubes, and its deletion in mice causes perinatal lethality with deficient primary myogenesis and disrupted myotube integrity, partly through a TRIO-dependent pathway [PMID:16914736]. At the Z-disk, filamin C anchors the dystrophin-glycoprotein complex via direct interaction with γ- and δ-sarcoglycan [PMID:10629222] and assembles a Z-band complex with IGFN1 and KY [PMID:20206623]; its dimerized form is maintained at its proper location by the small heat-shock protein HSPB7, whose loss causes FLNC aggregation, mislocalization, and sarcoglycan dysregulation [PMID:26929074]. Filamin C is required for adult cardiac function and sarcomere maintenance [PMID:36066120]. FLNC variants produce cardiomyopathy through two distinct mechanisms: truncating and splice variants reduce protein levels, supporting a haploinsufficiency model for dilated cardiomyopathy [PMID:28008423], whereas missense variants in Ig-loop domains destabilize the protein, impair homo- and hetero-dimerization, and drive cytoplasmic aggregate formation that sequesters FLNC from the Z-disk, causing restrictive, hypertrophic, and arrhythmogenic phenotypes [PMID:26666891, PMID:29858533, PMID:34235269]. These aggregates engage but overwhelm protein quality control, with dysregulation of chaperones, the ubiquitin-proteasome system, and autophagy/aggrephagy in affected muscle [PMID:23238331, PMID:38397924], and BAG3 recruitment to aggregates blocks alternative autophagic clearance [PMID:26969713]. Variant-specific functional consequences extend to contractility and electrophysiology in patient iPSC-cardiomyocytes [PMID:29212899, PMID:39315490]. Beyond muscle, FLNC is targeted for ubiquitination and proteasomal degradation by the MAGED2-TRIM28 E3 ligase complex [PMID:41310667] and participates in an S6K/FLNC/ITGβ3 signaling axis during osteoclastogenesis [PMID:39612888].","teleology":[{"year":1998,"claim":"Establishing the domain architecture defined how filamin C could function as an actin crosslinker and where muscle-specific features reside.","evidence":"cDNA cloning, RT-PCR, and sequence analysis identifying the actin-binding domain, 24 Ig-like repeats, two hinges, and a unique repeat-20 insertion","pmids":["9791010"],"confidence":"Medium","gaps":["Does not assign function to the unique repeat-20 insertion","No structural data on dimerization or hinge flexibility"]},{"year":2000,"claim":"Identifying sarcoglycan partners placed filamin C within the dystrophin-glycoprotein complex and linked it to muscular dystrophy pathology.","evidence":"Yeast two-hybrid screen and immunofluorescence of patient and mouse muscle showing FLNC interaction with γ/δ-sarcoglycan and altered localization in dystrophy","pmids":["10629222"],"confidence":"Medium","gaps":["Y2H interaction not biochemically reconstituted","Functional consequence of the interaction not tested"]},{"year":2006,"claim":"Loss-of-function in cells and mice showed filamin C is essential for myogenesis and myotube structure, not merely a passive crosslinker.","evidence":"Stable RNAi in C2C12 myoblasts and an exon-deletion knockout mouse, with epistasis comparison to TRIO-null cells","pmids":["16914736"],"confidence":"High","gaps":["Molecular basis of the TRIO-FLNc pathway not defined","Mechanism linking FLNc to fusion machinery unresolved"]},{"year":2010,"claim":"Defining the IGFN1/KY/FLNC complex extended the Z-band interactome of filamin C beyond sarcoglycans.","evidence":"Yeast two-hybrid, co-purification, and immunofluorescence in skeletal muscle","pmids":["20206623"],"confidence":"Medium","gaps":["Functional role of the complex not tested by loss-of-function","Stoichiometry and direct binding interfaces unknown"]},{"year":2016,"claim":"Multiple 2016 studies resolved the two-mechanism model of FLNC disease: haploinsufficiency from truncating/splice variants versus aggregation from missense variants.","evidence":"Patient cardiac Western blot plus zebrafish morpholino knockdown (haploinsufficiency); transfection of missense mutants in myoblasts/NIH3T3 plus patient IHC (aggregation)","pmids":["28008423","26666891"],"confidence":"Medium","gaps":["Why some variants reduce protein while others aggregate not fully predictable","Threshold of FLNC level for cardiac dysfunction undefined"]},{"year":2016,"claim":"Reconstitution in zebrafish showed aggregate-driven Z-disk sequestration causes protein insufficiency and that BAG3 recruitment blocks autophagic clearance, identifying a tractable pathway node.","evidence":"Tagged FLNCW2710X overexpression, knockdown rescue, and BAG3 manipulation in zebrafish with immunofluorescence","pmids":["26969713"],"confidence":"High","gaps":["Mechanism by which BAG3 blocks alternative autophagy not defined","Whether the same block applies to all aggregating variants untested"]},{"year":2016,"claim":"Demonstrating HSPB7 binds dimerized FLNC and is required for its localization established a chaperone safeguard against FLNC aggregation in vivo.","evidence":"Co-immunoprecipitation and muscle-specific HspB7 knockout mouse with immunofluorescence","pmids":["26929074"],"confidence":"High","gaps":["Whether HSPB7 directly prevents aggregation or acts indirectly unclear","Binding interface on dimerized FLNC not mapped"]},{"year":2018,"claim":"Mapping Ig-loop missense variants to restrictive cardiomyopathy clarified a genotype-phenotype link distinct from haploinsufficiency.","evidence":"Transfection aggregation assays and zebrafish in vivo modeling of p.A1186V and p.A1183L","pmids":["29858533"],"confidence":"Medium","gaps":["Why Ig-loop location dictates restrictive over dilated phenotype unresolved","No high-resolution structure of mutant Ig loops"]},{"year":2020,"claim":"Biochemical stability assays linked a specific missense variant to enhanced proteolytic susceptibility, grounding aggregation/insufficiency in measurable protein instability.","evidence":"Recombinant FLNC p.Pro442Arg proteolytic stability assay plus patient muscle proteomics","pmids":["32516863"],"confidence":"Medium","gaps":["Single variant tested; generality across mutation classes unknown","Cellular degradation route not pinpointed"]},{"year":2021,"claim":"A dimerization-domain frameshift was shown to abolish homo- and hetero-dimerization, providing the molecular defect behind dominant-negative aggregation.","evidence":"Dimerization interaction and transfection assays with biophysical analysis plus proteomics of patient muscle aggregates","pmids":["34235269"],"confidence":"High","gaps":["Whether the mutant titrates wild-type FLNC into aggregates not directly shown","Structural basis of dimerization failure not solved"]},{"year":2024,"claim":"iPSC-cardiomyocyte and structural studies refined variant-specific consequences, showing distinct electrophysiological and aggrephagy phenotypes across cardiomyopathy variants.","evidence":"Patient iPSC-cardiomyocyte calcium imaging, patch clamp, and transcriptomics (R1267Q vs V2264M); 3D modeling and patient muscle aggrephagy markers (A1186V)","pmids":["39315490","38397924"],"confidence":"Medium","gaps":["Causal link from FLNC defect to Nav1.5/calcium changes not mechanistically traced","In vitro phenotypes not validated against patient cardiac function"]},{"year":2024,"claim":"Identifying non-muscle regulatory and signaling roles broadened FLNC biology to E3-ligase-controlled turnover and osteoclast signaling.","evidence":"Co-IP, ubiquitination, and degradation assays of the MAGED2-TRIM28-FLNC axis in breast cancer; transcriptomics, knockdown, S6K inhibition, and ovariectomized mouse model for the S6K/FLNC/ITGβ3 axis","pmids":["41310667","39612888"],"confidence":"Medium","gaps":["Ubiquitination site and degron on FLNC not mapped","Whether MAGED2-TRIM28 regulates FLNC in muscle untested","Direct FLNC-ITGβ3 binding interface undefined"]},{"year":null,"claim":"How distinct FLNC variant classes selectively produce dilated, restrictive, hypertrophic, or arrhythmogenic phenotypes, and how aggregate-induced quality-control failure could be therapeutically reversed, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model predicting phenotype from variant position","Mechanism converting FLNC aggregation into arrhythmic electrophysiology unknown","No validated intervention restoring FLNC clearance in vivo"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,3]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,14]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[6,7,10]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9,11]}],"pathway":[{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[10,14,18]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[6,17]}],"complexes":["dystrophin-glycoprotein complex","IGFN1/KY/FLNC Z-band complex","MAGED2-TRIM28 E3 ligase complex"],"partners":["SGCG","SGCD","IGFN1","KY","HSPB7","BAG3","TRIM28","ITGB3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q14315","full_name":"Filamin-C","aliases":["ABP-280-like protein","ABP-L","Actin-binding-like protein","Filamin-2","Gamma-filamin"],"length_aa":2725,"mass_kda":291.0,"function":"Muscle-specific filamin, which plays a central role in sarcomere assembly and organization (PubMed:34405687). Critical for normal myogenesis, it probably functions as a large actin-cross-linking protein with structural functions at the Z lines in muscle cells. 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FLN2 protein localization was found to be altered in limb-girdle muscular dystrophy and Duchenne muscular dystrophy patients and mice compared to unaffected individuals.\",\n      \"method\": \"Yeast two-hybrid screen, immunofluorescence localization in patient and mouse tissue\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus immunolocalization in patient tissue, single lab, two orthogonal methods\",\n      \"pmids\": [\"10629222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Full-length FLNC (ABPL) was cloned and characterized as a 2,705 amino acid (~289 kDa) actin-binding protein containing an N-terminal actin-binding domain followed by 24 tandem immunoglobulin-like repeats, two hinge regions (Hinge I and Hinge II), and a unique 82-amino-acid insertion in repeat 20 absent in other filamin paralogues. An alternatively spliced isoform lacking Hinge I (~286 kDa) was identified by RT-PCR.\",\n      \"method\": \"cDNA cloning, RT-PCR, sequence analysis, comparison with genomic DNA\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — full-length cDNA characterization with RT-PCR isoform validation, single lab, multiple methods\",\n      \"pmids\": [\"9791010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The genomic structure of FLNC was determined: 48 exons and 47 introns spanning approximately 29.5 kb, with a unique exon 40A not present in FLNA or FLNB. FLNC was precisely mapped to chromosome 7q32.\",\n      \"method\": \"Genomic cloning, restriction mapping, sequence analysis\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic sequencing and mapping, single lab\",\n      \"pmids\": [\"11153914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Loss of FLNc function in C2C12 myoblasts (via stable RNAi knockdown) caused defects in myoblast differentiation and fusion, resulting in multinucleated 'myoballs' rather than elongated myotubes. FLNc-deficient mice (deletion of last 8 exons) died shortly after birth due to respiratory failure, with severely reduced birth weights, fewer muscle fibers and primary myotubes, variation in fiber size, and centrally located nuclei, indicating an essential role in primary myogenesis and myotube structural integrity. A TRIO-FLNc-dependent pathway was implicated in maintaining myotube structure, based on phenotypic similarity between FLNc-deficient and TRIO-deficient cells.\",\n      \"method\": \"Stable RNAi knockdown in C2C12 cells, knockout mouse model (exon deletion), phenotypic analysis, genetic epistasis comparison with TRIO-null cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function in both cell culture and mouse model, epistasis with TRIO pathway, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"16914736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FLNC was identified as a binding partner of IGFN1 (Immunoglobulin-like and fibronectin type 3 domain-containing 1) by yeast two-hybrid screening, and KY, IGFN1, and FLNC were shown to form a Z-band associated protein complex in skeletal muscle by combined yeast two-hybrid, biochemical, and immunofluorescence data.\",\n      \"method\": \"Yeast two-hybrid screen, biochemical co-purification, immunofluorescence\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus immunofluorescence, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"20206623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In FLNC mutation-associated myofibrillar myopathy, immunofluorescence studies of patient skeletal muscle revealed altered expression of chaperone proteins and components of proteasomal and autophagic degradation pathways specifically in muscle fibers with protein aggregates, suggesting dysfunction of protein quality control mechanisms as pathogenic driver.\",\n      \"method\": \"Immunofluorescence on patient muscle biopsy sections\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct immunofluorescence in patient tissue, single lab, single method but consistent across multiple patient samples\",\n      \"pmids\": [\"23238331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Expression of the FLNCW2710X mutant protein in zebrafish revealed that the mutant protein localizes correctly to the Z-disk and can rescue fiber disintegration caused by FLNC knockdown, demonstrating that functional domains required for muscle integrity are intact in the mutant. However, the mutant forms protein aggregates that sequester FLNC away from the Z-disk, causing myofibrillar disintegration through protein insufficiency. BAG3 is recruited to aggregates but does not degrade them via chaperone-assisted selective autophagy (CASA); instead, BAG3 recruitment blocks alternative autophagy pathways that would otherwise clear aggregates. Reducing BAG3 levels or stimulating autophagy could relieve this blockage.\",\n      \"method\": \"Fluorescently tagged overexpression in zebrafish, FLNC knockdown rescue assay, immunofluorescence, BAG3 manipulation\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reconstitution/rescue experiment in zebrafish combined with multiple orthogonal methods (overexpression, knockdown rescue, BAG3 manipulation), identifying specific pathway mechanism\",\n      \"pmids\": [\"26969713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HSPB7 interacts with dimerized FLNC, as shown by co-immunoprecipitation. Skeletal-muscle-specific ablation of HspB7 caused FLNC aggregation and mislocalization in muscle, demonstrating that HSPB7 is required to maintain proper FLNC localization and prevent myopathy progression. Loss of HSPB7 also caused abnormal upregulation and mislocalization of γ- and δ-sarcoglycan (but not dystrophin) in muscle.\",\n      \"method\": \"Co-immunoprecipitation (HSPB7 with dimerized FLNC), conditional knockout mouse (muscle-specific HspB7 deletion), immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction confirmed by Co-IP plus knockout mouse phenotype showing mislocalization, two orthogonal methods, direct functional consequence\",\n      \"pmids\": [\"26929074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Western blot analysis of cardiac tissue from a patient with FLNC splice variant showed decreased FLNC protein level, supporting haploinsufficiency as the mechanism of DCM pathogenesis. Morpholino knockdown of filamin Cb (ortholog) in zebrafish resulted in abnormal cardiac function and ultrastructure, providing in vivo evidence for the haploinsufficiency model.\",\n      \"method\": \"Western blot on patient cardiac tissue, zebrafish morpholino knockdown with cardiac phenotyping\",\n      \"journal\": \"JACC. Basic to translational science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient protein analysis plus in vivo zebrafish model, single lab, two orthogonal approaches\",\n      \"pmids\": [\"28008423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cytoplasmic aggregates of filamin C were observed in transfected myoblast cell lines expressing the missense mutant FLNC (p.S1624L), and immunohistochemistry of heart tissue confirmed filamin C-specific cytoplasmic inclusions in patients, establishing that missense mutations in FLNC can cause protein aggregation distinct from the haploinsufficiency mechanism of truncating mutations.\",\n      \"method\": \"Transfection of myoblast cell lines with mutant FLNC, immunohistochemistry on patient cardiac tissue\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — cell transfection plus patient tissue IHC, single lab, two orthogonal methods\",\n      \"pmids\": [\"26666891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Immunohistochemical analysis of cardiac tissue from a patient with the FLNC p.V2297M variant showed diminished FLNC localization at the Z-disk while localization at the intercalated disk was preserved. Stem cell-derived cardiomyocytes carrying the p.V2297M variant had diminished contractile activity compared to controls, establishing that the variant disrupts Z-disk targeting and contractile function.\",\n      \"method\": \"Immunohistochemistry on patient cardiac tissue, stem cell-derived cardiomyocyte contractility assay\",\n      \"journal\": \"Circulation. Cardiovascular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization in patient tissue plus iPSC-cardiomyocyte functional assay, single lab, two orthogonal methods\",\n      \"pmids\": [\"29212899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Expression of the FLNC p.Tyr1216Asn mutant protein in NIH3T3 cells produced filamin C aggregates, while Western blot showed normal filamin C protein levels in patient muscle biopsies, demonstrating that this missense mutation causes aggregate formation without reducing total protein expression.\",\n      \"method\": \"Transfection of NIH3T3 cells, Western blot on patient muscle biopsies\",\n      \"journal\": \"Revue neurologique\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, transfection in non-muscle cells, limited functional follow-up\",\n      \"pmids\": [\"27633507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FLNC missense variants localized in Ig-loop segments (p.A1186V and p.A1183L) were shown to be pathogenic by cellular studies (protein aggregation in transfected cells) and in vivo zebrafish modeling, which showed phenotypic abnormalities. This established that FLNC missense variants in Ig-loop segments predominantly cause restrictive cardiomyopathy via aggregate formation rather than haploinsufficiency.\",\n      \"method\": \"Transfection of cells with mutant FLNC, zebrafish in vivo modeling, morphological studies\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell transfection plus zebrafish in vivo validation, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"29858533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A frameshift mutation in the FLNC dimerization domain (p.K2676Pfs*3) produced a mutant FLNc protein that is misfolded, unstable, and incapable of forming homodimers or heterodimers with wild-type FLNc, as shown by interaction and transfection studies with biophysical analysis. Proteomic profiling of protein aggregates in patient muscle showed activation of the ubiquitin-proteasome system and autophagic pathways, indicating dysregulation of protein quality control.\",\n      \"method\": \"Interaction assays (dimerization), transfection studies, biophysical molecular analysis, proteomic profiling of muscle aggregates\",\n      \"journal\": \"Neurology. Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biophysical dimerization assay plus proteomics of patient tissue plus transfection, multiple orthogonal methods establishing specific molecular defect\",\n      \"pmids\": [\"34235269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Adult-specific cardiac RNAi depletion of Drosophila Filamin (dFil, the FLNC ortholog) caused cardiac dilatation, impaired systolic function, and sarcomeric alterations, establishing that filamin is required for cardiac function and maintenance of sarcomere integrity in the adult stage. Deletion of the last four Ig-like domains of dFil was dispensable for cardiac function.\",\n      \"method\": \"Drosophila cardiac-specific RNAi knockdown, CRISPR/Cas9 domain deletion, cardiac functional assays\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo cardiac RNAi loss-of-function with domain deletion analysis in Drosophila model, single lab\",\n      \"pmids\": [\"36066120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FLNC is ubiquitinated and subjected to proteasomal degradation by the MAGED2-TRIM28 E3 ubiquitin ligase complex. MAGED2 interacts with TRIM28 to enhance its ubiquitin ligase activity, and the complex targets FLNC for ubiquitination. Loss of FLNC downstream of this complex activates epithelial-to-mesenchymal transition (EMT), contributing to chemoresistance in triple-negative breast cancer.\",\n      \"method\": \"Biochemical assays (co-IP of MAGED2-TRIM28-FLNC complex), ubiquitination assay, proteasomal degradation assay, in vitro and in vivo functional experiments\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of three-component complex with functional ubiquitination assay and in vivo validation, single lab\",\n      \"pmids\": [\"41310667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FLNC expression increases dramatically during osteoclast differentiation. Inhibition of FLNC suppressed markers of osteoclast differentiation (TRAP, NFATc1, c-Fos) and bone resorption activity. S6K kinase regulates FLNC expression, and FLNC interacts with integrin β3 (ITGβ3) in osteoclasts; inhibiting S6K with PF-4708671 reduced FLNC expression and the FLNC-ITGβ3 interaction. This established an S6K/FLNC/ITGβ3 signaling axis in osteoclastogenesis.\",\n      \"method\": \"Transcriptomics, RT-PCR, Western blot, adenoviral overexpression/knockdown, proteomics, S6K inhibitor treatment, ovariectomized mouse model\",\n      \"journal\": \"Phytomedicine : international journal of phytotherapy and phytopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (transcriptomics, proteomics, functional knockdown, in vivo model), single lab\",\n      \"pmids\": [\"39612888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The FLNC p.Ala1186Val variant is located in the interstrand loop involved in intradomain stabilization and Ig-like domain interactions. 3D structural modeling showed local structural changes causing protein instability and aggregation in the form of cytoplasmic bodies. Myopathological studies showed prominent aggregation and upregulation of aggrephagy-associated proteins LC3B and p62 in patient muscle, demonstrating that protein aggregation with impaired aggrephagy underlies the disease mechanism.\",\n      \"method\": \"3D protein structural modeling, immunohistochemistry/immunofluorescence on patient muscle, bioinformatics structural analysis\",\n      \"journal\": \"Biomedicines\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — structural modeling plus patient tissue analysis, single lab, two complementary methods\",\n      \"pmids\": [\"38397924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"iPSC-derived cardiomyocytes from patients carrying FLNC R1267Q (arrhythmogenic cardiomyopathy-associated) versus V2264M (restrictive cardiomyopathy-associated) variants showed distinct molecular phenotypes: R1267Q caused greater disturbances in calcium dynamics, Nav1.5 kinetics, and action potentials compared to V2264M, accompanied by transcriptome changes in genes linked to action potential and sodium transport, establishing variant-specific effects on electrophysiology and calcium homeostasis.\",\n      \"method\": \"iPSC-derived cardiomyocytes from patients, calcium imaging, electrophysiology (patch clamp), transcriptomics\",\n      \"journal\": \"Cytoskeleton (Hoboken, N.J.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — iPSC-cardiomyocyte functional assays with multiple electrophysiological readouts plus transcriptomics, single lab\",\n      \"pmids\": [\"39315490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The recombinant FLNC p.Pro442Arg mutant protein (homozygous in a patient with congenital-onset myopathy) was shown to be less stable and more prone to degradation by proteolytic enzymes than wild-type FLNC in biochemical assays, establishing reduced protein stability as the molecular consequence of this mutation.\",\n      \"method\": \"Recombinant protein expression, proteolytic stability assay, proteomics of patient muscle\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro recombinant protein proteolytic stability assay plus patient proteomics, single lab\",\n      \"pmids\": [\"32516863\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FLNC encodes filamin C, a muscle-specific large actin-binding and crosslinking protein that localizes to Z-disks and intercalated disks in striated muscle, where it interacts with γ/δ-sarcoglycans, IGFN1/KY complex, and HSPB7 to maintain sarcomere integrity and myotube structure; loss-of-function (haploinsufficiency via truncating mutations) causes dilated and arrhythmogenic cardiomyopathies, while missense mutations in Ig-loop domains cause protein misfolding, dimerization failure, and aggregate formation that sequesters FLNC from the Z-disk and impairs autophagy/proteasomal clearance, producing myofibrillar myopathy and restrictive or hypertrophic cardiomyopathies; additionally, FLNC is targeted for ubiquitination and proteasomal degradation by the MAGED2-TRIM28 E3 ligase complex, and participates in an S6K/FLNC/ITGβ3 signaling axis in osteoclastogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FLNC encodes filamin C, a muscle-specific actin-binding and crosslinking protein built from an N-terminal actin-binding domain followed by 24 tandem immunoglobulin-like repeats, two hinge regions, and a paralog-unique insertion in repeat 20 [#1]. It is essential for striated muscle: loss of FLNc function blocks myoblast differentiation and fusion into elongated myotubes, and its deletion in mice causes perinatal lethality with deficient primary myogenesis and disrupted myotube integrity, partly through a TRIO-dependent pathway [#3]. At the Z-disk, filamin C anchors the dystrophin-glycoprotein complex via direct interaction with \\u03b3- and \\u03b4-sarcoglycan [#0] and assembles a Z-band complex with IGFN1 and KY [#4]; its dimerized form is maintained at its proper location by the small heat-shock protein HSPB7, whose loss causes FLNC aggregation, mislocalization, and sarcoglycan dysregulation [#7]. Filamin C is required for adult cardiac function and sarcomere maintenance [#14]. FLNC variants produce cardiomyopathy through two distinct mechanisms: truncating and splice variants reduce protein levels, supporting a haploinsufficiency model for dilated cardiomyopathy [#8], whereas missense variants in Ig-loop domains destabilize the protein, impair homo- and hetero-dimerization, and drive cytoplasmic aggregate formation that sequesters FLNC from the Z-disk, causing restrictive, hypertrophic, and arrhythmogenic phenotypes [#9, #12, #13]. These aggregates engage but overwhelm protein quality control, with dysregulation of chaperones, the ubiquitin-proteasome system, and autophagy/aggrephagy in affected muscle [#5, #17], and BAG3 recruitment to aggregates blocks alternative autophagic clearance [#6]. Variant-specific functional consequences extend to contractility and electrophysiology in patient iPSC-cardiomyocytes [#10, #18]. Beyond muscle, FLNC is targeted for ubiquitination and proteasomal degradation by the MAGED2-TRIM28 E3 ligase complex [#15] and participates in an S6K/FLNC/ITG\\u03b23 signaling axis during osteoclastogenesis [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing the domain architecture defined how filamin C could function as an actin crosslinker and where muscle-specific features reside.\",\n      \"evidence\": \"cDNA cloning, RT-PCR, and sequence analysis identifying the actin-binding domain, 24 Ig-like repeats, two hinges, and a unique repeat-20 insertion\",\n      \"pmids\": [\"9791010\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not assign function to the unique repeat-20 insertion\", \"No structural data on dimerization or hinge flexibility\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identifying sarcoglycan partners placed filamin C within the dystrophin-glycoprotein complex and linked it to muscular dystrophy pathology.\",\n      \"evidence\": \"Yeast two-hybrid screen and immunofluorescence of patient and mouse muscle showing FLNC interaction with \\u03b3/\\u03b4-sarcoglycan and altered localization in dystrophy\",\n      \"pmids\": [\"10629222\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Y2H interaction not biochemically reconstituted\", \"Functional consequence of the interaction not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Loss-of-function in cells and mice showed filamin C is essential for myogenesis and myotube structure, not merely a passive crosslinker.\",\n      \"evidence\": \"Stable RNAi in C2C12 myoblasts and an exon-deletion knockout mouse, with epistasis comparison to TRIO-null cells\",\n      \"pmids\": [\"16914736\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the TRIO-FLNc pathway not defined\", \"Mechanism linking FLNc to fusion machinery unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defining the IGFN1/KY/FLNC complex extended the Z-band interactome of filamin C beyond sarcoglycans.\",\n      \"evidence\": \"Yeast two-hybrid, co-purification, and immunofluorescence in skeletal muscle\",\n      \"pmids\": [\"20206623\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of the complex not tested by loss-of-function\", \"Stoichiometry and direct binding interfaces unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Multiple 2016 studies resolved the two-mechanism model of FLNC disease: haploinsufficiency from truncating/splice variants versus aggregation from missense variants.\",\n      \"evidence\": \"Patient cardiac Western blot plus zebrafish morpholino knockdown (haploinsufficiency); transfection of missense mutants in myoblasts/NIH3T3 plus patient IHC (aggregation)\",\n      \"pmids\": [\"28008423\", \"26666891\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Why some variants reduce protein while others aggregate not fully predictable\", \"Threshold of FLNC level for cardiac dysfunction undefined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Reconstitution in zebrafish showed aggregate-driven Z-disk sequestration causes protein insufficiency and that BAG3 recruitment blocks autophagic clearance, identifying a tractable pathway node.\",\n      \"evidence\": \"Tagged FLNCW2710X overexpression, knockdown rescue, and BAG3 manipulation in zebrafish with immunofluorescence\",\n      \"pmids\": [\"26969713\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which BAG3 blocks alternative autophagy not defined\", \"Whether the same block applies to all aggregating variants untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrating HSPB7 binds dimerized FLNC and is required for its localization established a chaperone safeguard against FLNC aggregation in vivo.\",\n      \"evidence\": \"Co-immunoprecipitation and muscle-specific HspB7 knockout mouse with immunofluorescence\",\n      \"pmids\": [\"26929074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HSPB7 directly prevents aggregation or acts indirectly unclear\", \"Binding interface on dimerized FLNC not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mapping Ig-loop missense variants to restrictive cardiomyopathy clarified a genotype-phenotype link distinct from haploinsufficiency.\",\n      \"evidence\": \"Transfection aggregation assays and zebrafish in vivo modeling of p.A1186V and p.A1183L\",\n      \"pmids\": [\"29858533\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Why Ig-loop location dictates restrictive over dilated phenotype unresolved\", \"No high-resolution structure of mutant Ig loops\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Biochemical stability assays linked a specific missense variant to enhanced proteolytic susceptibility, grounding aggregation/insufficiency in measurable protein instability.\",\n      \"evidence\": \"Recombinant FLNC p.Pro442Arg proteolytic stability assay plus patient muscle proteomics\",\n      \"pmids\": [\"32516863\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single variant tested; generality across mutation classes unknown\", \"Cellular degradation route not pinpointed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A dimerization-domain frameshift was shown to abolish homo- and hetero-dimerization, providing the molecular defect behind dominant-negative aggregation.\",\n      \"evidence\": \"Dimerization interaction and transfection assays with biophysical analysis plus proteomics of patient muscle aggregates\",\n      \"pmids\": [\"34235269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the mutant titrates wild-type FLNC into aggregates not directly shown\", \"Structural basis of dimerization failure not solved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"iPSC-cardiomyocyte and structural studies refined variant-specific consequences, showing distinct electrophysiological and aggrephagy phenotypes across cardiomyopathy variants.\",\n      \"evidence\": \"Patient iPSC-cardiomyocyte calcium imaging, patch clamp, and transcriptomics (R1267Q vs V2264M); 3D modeling and patient muscle aggrephagy markers (A1186V)\",\n      \"pmids\": [\"39315490\", \"38397924\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal link from FLNC defect to Nav1.5/calcium changes not mechanistically traced\", \"In vitro phenotypes not validated against patient cardiac function\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identifying non-muscle regulatory and signaling roles broadened FLNC biology to E3-ligase-controlled turnover and osteoclast signaling.\",\n      \"evidence\": \"Co-IP, ubiquitination, and degradation assays of the MAGED2-TRIM28-FLNC axis in breast cancer; transcriptomics, knockdown, S6K inhibition, and ovariectomized mouse model for the S6K/FLNC/ITG\\u03b23 axis\",\n      \"pmids\": [\"41310667\", \"39612888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination site and degron on FLNC not mapped\", \"Whether MAGED2-TRIM28 regulates FLNC in muscle untested\", \"Direct FLNC-ITG\\u03b23 binding interface undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How distinct FLNC variant classes selectively produce dilated, restrictive, hypertrophic, or arrhythmogenic phenotypes, and how aggregate-induced quality-control failure could be therapeutically reversed, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model predicting phenotype from variant position\", \"Mechanism converting FLNC aggregation into arrhythmic electrophysiology unknown\", \"No validated intervention restoring FLNC clearance in vivo\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [6, 7, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [10, 14, 18]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [6, 17]}\n    ],\n    \"complexes\": [\"dystrophin-glycoprotein complex\", \"IGFN1/KY/FLNC Z-band complex\", \"MAGED2-TRIM28 E3 ligase complex\"],\n    \"partners\": [\"SGCG\", \"SGCD\", \"IGFN1\", \"KY\", \"HSPB7\", \"BAG3\", \"TRIM28\", \"ITGB3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":8,"faith_total":8,"faith_pct":100.0}}