{"gene":"TFG","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":1999,"finding":"TFG (TRK-fused gene) was identified as a fusion partner of ALK in anaplastic large cell lymphoma, generating TFG-ALK(S) and TFG-ALK(L) chimeric proteins that exhibit constitutive tyrosine kinase activity in vitro.","method":"RT-PCR cloning of fusion transcripts; in vitro tyrosine kinase assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay directly demonstrating functional activity of chimeric protein","pmids":["10556217"],"is_preprint":false},{"year":1998,"finding":"The TFG coiled-coil domain mediates oligomerization of the TRK-T3 oncoprotein, which is required for constitutive, ligand-independent tyrosine kinase activation; the TFG N-terminal region is additionally required for full transforming activity, possibly through cellular localization or substrate interaction.","method":"Deletion mutagenesis of TFG domains; NIH3T3 transformation assay; biochemical analysis of oligomer formation","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis combined with functional transformation and biochemical oligomerization assays","pmids":["9488046"],"is_preprint":false},{"year":2002,"finding":"TFG-ALK fusion proteins (TFG-ALK(S), TFG-ALK(L), and the new TFG-ALK(XL)) have similar transforming efficiency to NPM-ALK in NIH-3T3 fibroblasts and form stable complexes with signaling proteins Grb2, Shc, and PLC-gamma.","method":"Transfection/transformation assay in NIH-3T3 cells; co-immunoprecipitation","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP and functional transformation assay with multiple TFG-ALK variants","pmids":["11943732"],"is_preprint":false},{"year":2003,"finding":"The PB1 domain and an SH2-binding motif within TFG sequences outside the coiled-coil domain are required for TRK-T3 oncogenic activation, contributing to protein processing, stable complex formation, and signaling.","method":"Deletion mutagenesis; site-specific mutagenesis; biochemical and biological assays in mammalian cells","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with mutagenesis and functional assays defining specific domain roles","pmids":["12584559"],"is_preprint":false},{"year":2004,"finding":"TFG interacts with and modulates the activity of the tyrosine phosphatase SHP-1; the SHP-1 SH2 domain associates with the TFG-derived portion of TRK-T3, while the SHP-1 catalytic domain associates with the NTRK1-derived portion, leading to down-regulation of TRK-T3 signaling.","method":"Co-immunoprecipitation; in vitro binding assays; phosphatase activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP and in vitro assays demonstrating direct interaction and functional consequence","pmids":["15557341"],"is_preprint":false},{"year":2006,"finding":"TFG interacts with NEMO and TANK, two proteins involved in the NF-κB pathway, identified by yeast two-hybrid screening and confirmed by in vitro and in vivo assays; TFG enhances NF-κB activity induced by TNF-α, TANK, TRAF2, and TRAF6.","method":"Yeast two-hybrid screening; co-immunoprecipitation; NF-κB reporter assay","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 — yeast two-hybrid confirmed by co-IP with functional reporter assay, single lab","pmids":["16547966"],"is_preprint":false},{"year":2011,"finding":"TFG-1 (the C. elegans TFG ortholog) interacts directly with SEC-16, the scaffolding protein at ER exit sites, and forms hexamers that facilitate co-assembly of SEC-16 with COPII subunits; TFG-1 depletion causes marked decline in SEC-16 and COPII levels at ER exit sites and reduces protein export from the ER.","method":"Co-immunoprecipitation; hydrodynamic (sedimentation) studies; RNAi depletion with cargo secretion assay in C. elegans","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1/2 — direct biochemical interaction, hydrodynamic characterization of oligomeric state, and in vivo functional depletion with clear phenotype","pmids":["21478858"],"is_preprint":false},{"year":2013,"finding":"A homozygous TFG p.R106C mutation (in the coiled-coil domain) impairs TFG self-assembly into oligomeric complexes; in cells, TFG inhibition slows ER protein secretion and alters ER morphology, disrupting peripheral ER tubule organization and collapsing the ER network onto the microtubule cytoskeleton, leading to hereditary axon degeneration.","method":"Biochemical characterization of mutant protein self-assembly; cell line secretion assays; fluorescence microscopy of ER morphology","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (biochemistry, imaging, secretion assay) in a disease-linked mutation study","pmids":["23479643"],"is_preprint":false},{"year":2013,"finding":"TFG protein binds TRIM25 upon virus infection and negatively regulates RIG-I-mediated type-I IFN signaling; knockdown of TFG upregulates RIG-I- and MAVS-induced IFN and NF-κB signaling pathways and inhibits VSV replication.","method":"shRNA knockdown; reporter assays for IFN and NF-κB; VSV replication assay; co-immunoprecipitation","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP and functional knockdown with defined pathway, single lab","pmids":["23810392"],"is_preprint":false},{"year":2014,"finding":"A TFG p.Gly269Val mutation increases propensity of TFG to form aggregates, sequestering both mutant and wild-type TFG and depleting functional TFG; inhibition of endogenous TFG compromises protein secretion, rescuable only by wild-type but not mutant TFG.","method":"Cell transfection studies; Gaussia luciferase secretion reporter assay; aggregation analysis","journal":"Neurology","confidence":"High","confidence_rationale":"Tier 2 — multiple functional assays in human patient mutation context with specific rescue experiment","pmids":["25098539"],"is_preprint":false},{"year":2015,"finding":"Mammalian TFG forms flexible, octameric cup-like structures that self-associate into larger polymers in vitro; at the ER/ERGIC interface, TFG locally concentrates COPII-coated transport carriers and links ER exit sites to ERGIC membranes; loss of TFG dramatically slows ER protein export and causes accumulation of COPII-coated carriers throughout the cytoplasm.","method":"3D electron microscopy; in vitro polymerization assay; siRNA knockdown with secretion assay and electron tomography","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — structural determination by EM combined with in vitro reconstitution and in-cell functional validation","pmids":["25586378"],"is_preprint":false},{"year":2016,"finding":"TFG organizes transitional ER (tER) and ER exit sites (ERESs) into larger structures; TFG is required for procollagen export from the ER but not for transport of small soluble cargoes; depletion of TFG disperses tER elements while preserving largely functional individual ERESs associated with ERGICs.","method":"siRNA depletion; live-cell imaging; procollagen secretion assay; fluorescence microscopy","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — multiple imaging and secretion assays distinguishing cargo-specific roles","pmids":["27184855"],"is_preprint":false},{"year":2016,"finding":"ALG-2 (Ca2+-binding protein) interacts with TFG through a canonical ALG-2-binding motif and promotes TFG polymerization in a Ca2+-dependent manner; ALG-2 concentrates TFG at ER exit sites and extends TFG half-life at ERES.","method":"Co-immunoprecipitation; in vitro cross-linking assay; live-cell imaging; ALG-2 overexpression","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 2 — in vitro polymerization reconstitution plus live imaging, Ca2+-dependence demonstrated","pmids":["27813252"],"is_preprint":false},{"year":2016,"finding":"A TFG p.Arg22Trp variant in the PB1 domain impairs TFG oligomerization in vitro, distinct from the coiled-coil domain R106C variant, suggesting that both PB1 and coiled-coil domains contribute to TFG complex formation and that phenotypic severity may correlate with variant location.","method":"In vitro oligomerization assay; biochemical characterization of mutant protein","journal":"European journal of human genetics : EJHG","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro oligomerization assay comparing multiple variants, single lab","pmids":["27601211"],"is_preprint":false},{"year":2017,"finding":"TFG C-terminus binds directly to Sec23 (inner COPII coat subunit) through a shared interface with the outer COPII coat and cargo receptor Tango1/cTAGE5; TFG binding outcompetes these interactions in a concentration-dependent manner, promoting outer coat dissociation; TFG tethers vesicles harboring the inner COPII coat, clustering them at the ER/ERGIC interface.","method":"In vitro binding/competition assay; cryo-EM; vesicle tethering assay; cell-based co-localization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — reconstituted binding competition, structural data, and functional tethering assays","pmids":["28851831"],"is_preprint":false},{"year":2017,"finding":"β-cell specific TFG knockout mice display glucose intolerance, reduced insulin secretion, smaller β-cell masses due to diminished proliferation, ER dilation (indicative of ER stress), and smaller insulin crystal diameters, demonstrating a role for TFG in maintaining pancreatic β-cell mass and secretory function.","method":"Conditional knockout mouse model; glucose tolerance test; immunohistochemistry; electron microscopy; microarray","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — clean tissue-specific KO with defined metabolic and structural phenotypes","pmids":["29026155"],"is_preprint":false},{"year":2018,"finding":"The TFG p.R106C mutation (coiled-coil domain) alters compaction of TFG ring complexes; CRISPR-engineered human iPSC-derived neurons expressing mutant TFG at endogenous levels show specific defects in ER cargo secretion and axon fasciculation.","method":"CRISPR-Cas9 genome editing; biochemical analysis of ring complex compaction; iPSC differentiation to neurons; secretion assay; axon fasciculation assay","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1/2 — CRISPR editing at endogenous locus, multiple assays, disease-relevant cellular model","pmids":["30157421"],"is_preprint":false},{"year":2020,"finding":"TFG interacts with FANCD2-V2 (a specific isoform of FANCD2) through TFG amino acids 5-100 and FANCD2-V2 residues 1437-1442; this interaction maintains the steady-state level of FANCD2-V2 protein and enables timely nuclear focus formation upon DNA damage. Cells lacking TFG aa5-100 fail to show proper FANCD2-V2 focus kinetics and gain carcinogenicity.","method":"Co-immunoprecipitation; deletion mutagenesis; nuclear foci assay upon DNA damage; carcinogenicity assay","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with mutagenesis and functional focus assay, single lab","pmids":["33099537"],"is_preprint":false},{"year":2020,"finding":"TFG is required for autophagy flux in B cells; loss of TFG results in expanded ER, increased ER stress, higher LC3 accumulation, lower LC3-II turnover, and larger autophagosomes, indicating a block in autophagosome-lysosome fusion.","method":"CRISPR-Cas9 KO in CH12 B cells; tandem-fluorescent LC3 assay; ER stress gene expression; LC3 turnover assay","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — clean CRISPR KO with multiple orthogonal autophagy flux assays","pmids":["32910713"],"is_preprint":false},{"year":2020,"finding":"A TFG-RET fusion (exons 1-4 of TFG fused to RET kinase domain) transforms immortalized human thyroid cells in a kinase-dependent manner; TFG-RET oligomerizes in a PB1 domain-dependent manner, and oligomerization is required for oncogenic transformation.","method":"RNA-seq fusion detection; transformation assay; kinase inhibition; PB1 domain mutagenesis; oligomerization analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — transformation assay with kinase-dependence and domain-specific mutagenesis","pmids":["32345963"],"is_preprint":false},{"year":2021,"finding":"TFG interacts with TRAF3 (E3 ubiquitin ligase) and stabilizes ULK1 by competing with the ULK1-TRAF3 interaction, thereby preventing K48-linked ubiquitination and proteasomal degradation of ULK1; TFG-deficient macrophages show increased ROS, impaired ULK1 stability, and enhanced pyroptotic cell death upon LPS/nigericin stimulation.","method":"Co-immunoprecipitation; ubiquitination assay (K48-linkage); siRNA/shRNA knockdown; cell death assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — co-IP with ubiquitination linkage determination and functional rescue experiment","pmids":["35091545"],"is_preprint":false},{"year":2021,"finding":"TFG binds LC3C through a canonical LIR motif; this interaction favors LC3C-ULK1 binding, controls ULK1 puncta number and localization, and is required for proper formation of omegasomes and autophagosomes; patient fibroblasts with R106C-TFG show defects in autophagy and ULK1 puncta.","method":"Co-immunoprecipitation; LIR motif mutagenesis; autophagosome/omegasome quantification; patient-derived fibroblast assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — direct binding with mutagenesis, functional autophagy assays, and patient cell validation","pmids":["33932238"],"is_preprint":false},{"year":2021,"finding":"TFG is required for virus-induced TBK1 activation and IRF3 phosphorylation/dimerization via the RIG-I pathway; TFG forms a complex with TRAF3 that enables efficient TRAF3 recruitment to MAVS following Sendai virus infection; TFG also enables the TRAF3-TFG complex to engage mTOR, allowing TBK1 to phosphorylate mTOR-S2159 and promote mTORC1 signaling during antiviral response.","method":"siRNA/shRNA knockdown; co-immunoprecipitation; IRF3 dimerization assay; Sendai virus infection; mTOR phosphorylation assay","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 — multiple co-IP interactions and downstream phosphorylation assays in virus-infected cells, replicated with siRNA and shRNA","pmids":["33411856"],"is_preprint":false},{"year":2022,"finding":"In rat primary cortical neurons, the TFG p.R106C variant causes a kinetic delay in biosynthetic ER-to-Golgi secretory protein transport and impairs trafficking of Rab4A-positive recycling endosomes specifically in axons and dendrites, resulting in down-regulated inhibitory receptor signaling; mitochondria and lysosomes are unaffected.","method":"CRISPR-Cas9 rat model; primary neuron culture; live-cell cargo trafficking assay; Rab4A endosome quantification; inhibitory receptor signaling assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — in vivo CRISPR rat model with organelle-specific trafficking assays in primary neurons","pmids":["36161950"],"is_preprint":false},{"year":2022,"finding":"Loss of motor neuron-specific TFG (vMNTFG KO mice) causes motor function deterioration, muscle atrophy, and neuromuscular junction (NMJ) denervation in slow-twitch muscles; muscle-specific TFG KO (MUSTFG KO) does not impair movement but shows elevated denervation marker and impaired Agrin-induced AChR clustering.","method":"Cell type-specific conditional KO mouse; behavioral testing; NMJ immunostaining; electrophysiology","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — two clean conditional KO models with distinct cell type-specific phenotypes","pmids":["35121777"],"is_preprint":false},{"year":2023,"finding":"The low-complexity domain of TFG containing disease-related mutations G269V or P285L forms amyloid fibrils; cryo-EM structures confirm an amyloid nature with double-protofilament cores, and mutant sequences show increased amyloid propensity compared to wild-type.","method":"Cryo-EM structure determination; in vitro fibril formation assay; bioinformatic amyloid propensity prediction","journal":"PNAS nexus","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures with in vitro reconstitution demonstrating amyloid fibril formation","pmids":["38077690"],"is_preprint":false},{"year":2024,"finding":"TFG regulates the rate of inner COPII coat (Sec23) recruitment to ER budding sites; in TFG-deficient cells, Sec23 accumulates more rapidly at ER subdomains, potentially altering GTP hydrolysis timing on Sar1 and delaying anterograde trafficking of secretory cargoes.","method":"Live-cell TIRF microscopy of COPII dynamics; siRNA knockdown; secretion assay for multiple cargoes","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — quantitative live imaging of coat dynamics with functional secretion assays","pmids":["38985515"],"is_preprint":false},{"year":2024,"finding":"TFG self-organizes under physiological conditions to form a hollow, anisotropic condensate that matches the dimensions of the ER-Golgi interface; regularly spaced hydrophobic residues control condensation; the condensate acts as a molecular sieve allowing COPII (anterograde) access to the interior while restricting COPI (retrograde) coats, spatially compartmentalizing the early secretory pathway.","method":"Biophysical condensate characterization; size-exclusion assay with fluorescent COPII/COPI probes; in vitro reconstitution; cell cycle regulation analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution of condensate with molecular sieve function validated by size-selective exclusion assays","pmids":["40253417"],"is_preprint":false},{"year":2024,"finding":"Reintroduction of wild-type TFG specifically into synapsin 1-positive neurons (but not GFAP-positive glia) via gene therapy provides robust protection against motor neuron disease in TFG p.R106C rats, demonstrating that TFG pathology in HSP is cell-autonomous to neurons.","method":"Cell type-specific AAV gene therapy in CRISPR rat model; quantitative gait analysis; astrocyte reactivity assessment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — cell-specific rescue in vivo distinguishing neuronal vs glial contributions","pmids":["39527745"],"is_preprint":false},{"year":2024,"finding":"X-ray crystallography and cryo-EM reveal that TFG forms octameric ring complexes through a network of electrostatic and hydrophobic interactions at the protomer interface; HSP-associated PB1 domain mutations disrupt this interface, destabilizing octamers and ultimately causing axonopathy.","method":"X-ray crystallography; cryo-EM structure determination; in vivo genetic analysis in disease model","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 — dual structural methods (X-ray + cryo-EM) with functional disease validation","pmids":["39574627"],"is_preprint":true},{"year":2025,"finding":"FBXO45 E3 ligase promotes TFG Lys103 ubiquitination, increasing TFG stability; stabilized TFG facilitates binding of transcription factor ATF2, which upregulates NF-κB p65, promoting HCC cell migration, invasion, and lung metastasis.","method":"Co-immunoprecipitation; ubiquitination site mapping (Lys103); overexpression/knockdown; orthotopic xenograft model; ATF2-NF-κB reporter","journal":"JHEP reports : innovation in hepatology","confidence":"Medium","confidence_rationale":"Tier 2 — ubiquitination site mapped and functional consequence in vivo demonstrated, single lab","pmids":["41030651"],"is_preprint":false},{"year":2000,"finding":"Xenopus TFG (xTFG) interacts with SH3 domains of Src, PLCγ, and the p85 subunit of PI3-kinase through a conserved SH3-binding motif, identifying TFG as an SH3 domain-binding protein.","method":"SH3 domain pulldown; mRNA microinjection overexpression in Xenopus embryos","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 3 — pulldown assay demonstrating SH3 binding, ortholog study","pmids":["10861999"],"is_preprint":false}],"current_model":"TFG (Trk-fused gene) is a scaffolding protein that self-assembles into octameric ring complexes—and at physiological concentrations forms a hollow condensate—at the ER/ERGIC interface, where it directly binds the inner COPII coat subunit Sec23 to regulate the kinetics of COPII assembly/disassembly, cluster anterograde transport carriers, and facilitate ER-to-Golgi cargo export (including procollagen); it also interacts with SEC-16 to support ER exit site organization, binds LC3C via a LIR motif to link the secretory pathway to autophagosome biogenesis, associates with TRAF3 to promote antiviral innate immune signaling via TBK1-IRF3 and ULK1 stabilization, and when its oligomeric assembly is disrupted by disease-associated mutations (e.g., p.R106C, p.P285L, p.G269V) causes ER dysfunction, impaired secretory and endosomal trafficking in neurons, and progressive neurodegeneration in a cell-autonomous (neuronal) manner."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing that TFG possesses a coiled-coil domain that drives oligomerization, and that this self-assembly is essential for constitutive activation of oncogenic TRK-T3, defined TFG's core biochemical property — homo-oligomerization — and its first known functional consequence.","evidence":"Deletion mutagenesis, NIH3T3 transformation assay, and biochemical oligomerization analysis","pmids":["9488046"],"confidence":"High","gaps":["Native cellular function of TFG oligomerization unknown","Whether oligomerization serves any non-oncogenic role unresolved"]},{"year":2003,"claim":"Identification of the PB1 domain and SH2-binding motif as additional determinants of TFG complex formation and signaling showed that TFG uses multiple domains beyond the coiled-coil for oligomerization and protein interactions.","evidence":"Site-specific and deletion mutagenesis with biological and biochemical assays in mammalian cells","pmids":["12584559","10861999"],"confidence":"High","gaps":["Endogenous binding partners of the PB1 domain in non-oncogenic context not identified","Structural basis of PB1-mediated oligomerization unresolved"]},{"year":2006,"claim":"Discovery that TFG interacts with NEMO and TANK and enhances NF-κB signaling provided the first evidence of a native TFG signaling function outside oncogenic fusions.","evidence":"Yeast two-hybrid screen, co-immunoprecipitation, NF-κB reporter assay","pmids":["16547966"],"confidence":"Medium","gaps":["Mechanism by which TFG enhances NF-κB not resolved","Physiological relevance in vivo not tested","Single-lab finding without independent replication"]},{"year":2011,"claim":"Demonstration that C. elegans TFG-1 directly binds SEC-16 and is required for COPII and SEC-16 levels at ER exit sites established TFG's primary physiological role: organizing COPII-dependent ER export.","evidence":"Co-immunoprecipitation, sedimentation analysis showing hexamers, RNAi depletion with cargo secretion assay in C. elegans","pmids":["21478858"],"confidence":"High","gaps":["Mammalian validation needed","Whether TFG directly contacts COPII subunits unknown","Mechanism of SEC-16 stabilization unclear"]},{"year":2013,"claim":"Linking the TFG p.R106C mutation to impaired oligomerization, slowed ER secretion, disrupted ER morphology, and hereditary axon degeneration established TFG as a disease gene for hereditary spastic paraplegia and connected its oligomeric assembly to neuronal health.","evidence":"Biochemical self-assembly assays, cell-based secretion assays, fluorescence microscopy of ER morphology in patient-derived and manipulated cells","pmids":["23479643"],"confidence":"High","gaps":["Whether defect is cell-autonomous to neurons not established","Downstream neurotoxic mechanism (ER stress vs. trafficking defect) not resolved"]},{"year":2015,"claim":"Structural and functional studies revealing that mammalian TFG forms octameric cup-like structures that polymerize and concentrate COPII carriers at the ER–ERGIC interface defined the architecture by which TFG organizes early secretory trafficking.","evidence":"3D electron microscopy, in vitro polymerization, siRNA knockdown with electron tomography and secretion assay","pmids":["25586378"],"confidence":"High","gaps":["Direct COPII coat subunit binding interface not mapped","How TFG polymers spatially segregate coated carriers unresolved"]},{"year":2016,"claim":"Showing that TFG is specifically required for procollagen but not small soluble cargo export revealed cargo-selective roles, while ALG-2 was identified as a calcium-dependent regulator of TFG polymerization at ER exit sites.","evidence":"siRNA depletion with live-cell imaging and procollagen secretion assays; ALG-2 co-IP and in vitro cross-linking polymerization assays","pmids":["27184855","27813252"],"confidence":"High","gaps":["How cargo selectivity arises mechanistically unclear","Whether ALG-2–TFG regulation is required in vivo untested"]},{"year":2017,"claim":"Demonstrating that TFG's C-terminus binds Sec23 on the same interface used by the outer COPII coat and Tango1/cTAGE5, competing for this site in a concentration-dependent manner, provided a molecular mechanism for TFG-driven outer coat disassembly and vesicle tethering at the ER–ERGIC boundary.","evidence":"In vitro binding competition, cryo-EM, vesicle tethering assay, cell-based co-localization","pmids":["28851831"],"confidence":"High","gaps":["Kinetic parameters of competition in live cells not measured","Whether Tango1 and TFG act sequentially or in parallel unclear"]},{"year":2018,"claim":"CRISPR-engineered iPSC-derived human neurons with endogenous TFG R106C confirmed that the mutation alters ring complex compaction and causes cargo secretion and axon fasciculation defects, validating disease-relevance in a human neuronal model.","evidence":"CRISPR-Cas9 genome editing in iPSCs, biochemical ring analysis, neuronal secretion and fasciculation assays","pmids":["30157421"],"confidence":"High","gaps":["In vivo validation in animal model pending","Whether fasciculation defect is primary or secondary to secretion impairment unclear"]},{"year":2021,"claim":"Convergent studies established TFG as a dual regulator linking the secretory pathway to autophagy and innate immunity: TFG binds LC3C via a LIR motif to control ULK1 puncta formation and autophagosome biogenesis, interacts with TRAF3 to stabilize ULK1 against K48-ubiquitination, and promotes TBK1–IRF3 antiviral signaling by facilitating TRAF3 recruitment to MAVS.","evidence":"LIR motif mutagenesis and autophagosome quantification; co-IP with ubiquitination linkage assays; IRF3 dimerization and mTOR phosphorylation upon Sendai virus infection","pmids":["33932238","35091545","33411856"],"confidence":"High","gaps":["Whether autophagy and innate immune functions are coupled or independent unclear","Structural basis of TFG–TRAF3 interaction not resolved"]},{"year":2022,"claim":"The TFG R106C mutation in rat primary neurons was shown to impair both biosynthetic ER-to-Golgi transport and Rab4A-positive recycling endosome trafficking specifically in axons and dendrites, broadening disease pathology beyond secretory to endosomal compartments.","evidence":"CRISPR rat model, live-cell cargo trafficking and Rab4A endosome quantification in primary cortical neurons","pmids":["36161950"],"confidence":"High","gaps":["Molecular mechanism linking TFG to Rab4A endosomes unresolved","Whether endosomal defect or secretory defect is the primary pathogenic driver unclear"]},{"year":2023,"claim":"Cryo-EM structures demonstrated that disease-associated mutations G269V and P285L in TFG's low-complexity domain promote amyloid fibril formation, revealing a gain-of-toxic-function mechanism distinct from loss of oligomerization.","evidence":"Cryo-EM fibril structure determination, in vitro amyloid formation assay","pmids":["38077690"],"confidence":"High","gaps":["Whether amyloid fibrils form in vivo in patient neurons not shown","Relative contribution of amyloid gain-of-function vs. loss of ring function to disease unclear"]},{"year":2024,"claim":"Multiple studies established that TFG regulates COPII coat dynamics (controlling Sec23 recruitment rate), forms a hollow condensate that acts as a molecular sieve permitting COPII but excluding COPI at the ER–ERGIC interface, and that neuron-specific gene therapy rescues motor neuron disease in R106C rats, confirming cell-autonomous neuronal pathology.","evidence":"Live-cell TIRF microscopy of coat dynamics; in vitro condensate reconstitution with size-selective exclusion assays; cell type-specific AAV gene therapy in CRISPR rat model","pmids":["38985515","40253417","39527745"],"confidence":"High","gaps":["How condensate formation is regulated in vivo (cell cycle, signaling) incompletely understood","Whether COPI exclusion is the primary mechanism preventing retrograde coat invasion not formally tested in cells"]},{"year":null,"claim":"Key open questions include how TFG's secretory, autophagy, and innate immune functions are coordinated or prioritized in different cell types, the structural basis of disease-specific mutations in full-length octameric context, and whether therapeutic intervention can target condensate or oligomer integrity to treat neurodegeneration.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Integration of secretory, autophagy, and immune functions into a unified model lacking","Full-length octamer structure with disease mutations not yet resolved at atomic resolution in peer-reviewed literature","No therapeutic strategy targeting TFG condensate properties validated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[6,10,14,27]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[14,20,21,22]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[6,7,10,11,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[10,14,27]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[6,10,11,14,26,27]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[18,21]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[22]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[6,10,14,26]}],"complexes":["TFG octameric ring","COPII coat complex (via Sec23 binding)"],"partners":["SEC23A","SEC16","ALG2","LC3C","TRAF3","NEMO","TANK","TRIM25"],"other_free_text":[]},"mechanistic_narrative":"TFG is a self-assembling scaffolding protein that forms octameric ring complexes and hollow condensates at the ER–ERGIC interface, where it organizes COPII-coated transport carriers, regulates inner coat (Sec23) dynamics, and spatially compartmentalizes anterograde from retrograde trafficking to control ER-to-Golgi cargo export including procollagen [PMID:25586378, PMID:28851831, PMID:38985515, PMID:40253417]. TFG binds SEC-16 to maintain ER exit site architecture, interacts with LC3C via a LIR motif to coordinate autophagosome biogenesis through ULK1 regulation, and associates with TRAF3 to promote TBK1–IRF3 antiviral signaling and stabilize ULK1 against proteasomal degradation [PMID:21478858, PMID:33932238, PMID:33411856, PMID:35091545]. Disease-associated mutations in the PB1 or coiled-coil domains (e.g., R106C, G269V, P285L) disrupt oligomerization or promote amyloid fibril formation, impairing ER secretory and endosomal trafficking in a neuron-autonomous manner and causing hereditary spastic paraplegia and related axonopathies [PMID:23479643, PMID:36161950, PMID:38077690, PMID:39527745]."},"prefetch_data":{"uniprot":{"accession":"Q92734","full_name":"Protein TFG","aliases":["TRK-fused gene protein"],"length_aa":400,"mass_kda":43.4,"function":"Plays a role in the normal dynamic function of the endoplasmic reticulum (ER) and its associated microtubules (PubMed:23479643, PubMed:27813252). Required for secretory cargo traffic from the endoplasmic reticulum to the Golgi apparatus (PubMed:21478858)","subcellular_location":"Endoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/Q92734/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TFG","classification":"Not Classified","n_dependent_lines":96,"n_total_lines":1208,"dependency_fraction":0.07947019867549669},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TFG","total_profiled":1310},"omim":[{"mim_id":"619560","title":"MICRO RNA 135B; MIR135B","url":"https://www.omim.org/entry/619560"},{"mim_id":"615658","title":"SPASTIC PARAPLEGIA 57, AUTOSOMAL RECESSIVE; SPG57","url":"https://www.omim.org/entry/615658"},{"mim_id":"612237","title":"CHONDROSARCOMA, EXTRASKELETAL 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Part A","url":"https://pubmed.ncbi.nlm.nih.gov/31111683","citation_count":5,"is_preprint":false},{"pmid":"35642252","id":"PMC_35642252","title":"Mutation Screening of TFG in α-Synucleinopathy and Amyotrophic Lateral Sclerosis.","date":"2022","source":"Movement disorders : official journal of the Movement Disorder Society","url":"https://pubmed.ncbi.nlm.nih.gov/35642252","citation_count":4,"is_preprint":false},{"pmid":"38077690","id":"PMC_38077690","title":"Fibril structures of TFG protein mutants validate the identification of TFG as a disease-related amyloid protein by the IMPAcT method.","date":"2023","source":"PNAS nexus","url":"https://pubmed.ncbi.nlm.nih.gov/38077690","citation_count":4,"is_preprint":false},{"pmid":"38954846","id":"PMC_38954846","title":"Dramatic response to crizotinib through MET phosphorylation inhibition in rare TFG-MET fusion advanced squamous cell lung cancer.","date":"2025","source":"The oncologist","url":"https://pubmed.ncbi.nlm.nih.gov/38954846","citation_count":4,"is_preprint":false},{"pmid":"32666699","id":"PMC_32666699","title":"A novel TFG c.793C>G mutation in a Chinese pedigree with Charcot-Marie-Tooth disease 2.","date":"2020","source":"Brain and behavior","url":"https://pubmed.ncbi.nlm.nih.gov/32666699","citation_count":3,"is_preprint":false},{"pmid":"38985515","id":"PMC_38985515","title":"TFG regulates inner COPII coat recruitment to facilitate anterograde secretory protein transport.","date":"2024","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/38985515","citation_count":3,"is_preprint":false},{"pmid":"38962049","id":"PMC_38962049","title":"Remarkable response to capmatinib in a patient with intrahepatic cholangiocarcinoma harboring TFG-MET fusion.","date":"2024","source":"International cancer conference journal","url":"https://pubmed.ncbi.nlm.nih.gov/38962049","citation_count":3,"is_preprint":false},{"pmid":"39527745","id":"PMC_39527745","title":"Cell type-specific gene therapy confers protection against motor neuron disease caused by a TFG variant.","date":"2024","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/39527745","citation_count":2,"is_preprint":false},{"pmid":"37305584","id":"PMC_37305584","title":"TFG::ALK fusion in ALK positive large B-cell lymphoma: a case report and review of literature.","date":"2023","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/37305584","citation_count":2,"is_preprint":false},{"pmid":"24073693","id":"PMC_24073693","title":"A TFG-TEC nuclear localization mutant forms complexes with the wild-type TFG-TEC oncoprotein and suppresses its activity.","date":"2013","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/24073693","citation_count":2,"is_preprint":false},{"pmid":"38622850","id":"PMC_38622850","title":"Reclassification of a spindle cell sarcoma after identification of a TFG-ROS1 fusion: A case demonstrating the clinical benefit of next-generation sequencing in sarcoma.","date":"2024","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/38622850","citation_count":2,"is_preprint":false},{"pmid":"38837630","id":"PMC_38837630","title":"Characterization of a novel TFG variant causing autosomal recessive pure hereditary spastic paraplegia.","date":"2024","source":"Annals of clinical and translational neurology","url":"https://pubmed.ncbi.nlm.nih.gov/38837630","citation_count":1,"is_preprint":false},{"pmid":"38649144","id":"PMC_38649144","title":"Identification of TFG- and Autophagy-Regulated Proteins and Glycerophospholipids in B Cells.","date":"2024","source":"Journal of proteome research","url":"https://pubmed.ncbi.nlm.nih.gov/38649144","citation_count":1,"is_preprint":false},{"pmid":"35864671","id":"PMC_35864671","title":"Proximal Dominant Hereditary Motor and Sensory Neuropathy with TFG Mutation: First Case Report from India.","date":"2022","source":"Neurology India","url":"https://pubmed.ncbi.nlm.nih.gov/35864671","citation_count":1,"is_preprint":false},{"pmid":"40578648","id":"PMC_40578648","title":"Screening and identification of Theileria annulata proteins interacting with bovine TFG proteins.","date":"2025","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/40578648","citation_count":1,"is_preprint":false},{"pmid":"30003432","id":"PMC_30003432","title":"Transforming Growth Factor Beta (TFG-β) Concentration Isoforms are Diminished in Acute Coronary Syndrome.","date":"2018","source":"Cell biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/30003432","citation_count":1,"is_preprint":false},{"pmid":"36430262","id":"PMC_36430262","title":"TFG-β Nuclear Staining as a Potential Relapse Risk Factor in Early-Stage Non-Small-Cell Lung Cancer.","date":"2022","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36430262","citation_count":1,"is_preprint":false},{"pmid":"39574627","id":"PMC_39574627","title":"Multiple roles for TFG ring complexes in neuronal cargo trafficking.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39574627","citation_count":1,"is_preprint":false},{"pmid":"40700600","id":"PMC_40700600","title":"ALK-positive adult histiocytosis with a TFG-ALKfusion gene.","date":"2025","source":"The oncologist","url":"https://pubmed.ncbi.nlm.nih.gov/40700600","citation_count":1,"is_preprint":false},{"pmid":"36582889","id":"PMC_36582889","title":"A novel TFG variant of uncertain significance in amyotrophic lateral sclerosis: A case report and review of literature.","date":"2022","source":"Annals of medicine and surgery (2012)","url":"https://pubmed.ncbi.nlm.nih.gov/36582889","citation_count":1,"is_preprint":false},{"pmid":"24291930","id":"PMC_24291930","title":"[Hereditary motor and sensory neuropathy with proximal dominant involvement (HMSN-P) is caused by a mutation in TFG].","date":"2013","source":"Rinsho shinkeigaku = Clinical neurology","url":"https://pubmed.ncbi.nlm.nih.gov/24291930","citation_count":1,"is_preprint":false},{"pmid":"39606904","id":"PMC_39606904","title":"First case of acute promyelocytic leukemia with TFG-RARA achieved complete remission treated with venetoclax and all-trans retinoic acid.","date":"2024","source":"Hematology (Amsterdam, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/39606904","citation_count":1,"is_preprint":false},{"pmid":"19007018","id":"PMC_19007018","title":"[Effect of nebulized TFG on Th1/Th2 imbalance in mouse model with asthma].","date":"2008","source":"Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica","url":"https://pubmed.ncbi.nlm.nih.gov/19007018","citation_count":1,"is_preprint":false},{"pmid":"40386562","id":"PMC_40386562","title":"Venetoclax combined with ATRA shows promising therapeutic potential for TFG:: RARA variant APL: a case report.","date":"2025","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/40386562","citation_count":1,"is_preprint":false},{"pmid":"41030651","id":"PMC_41030651","title":"Elevated FBXO45 promotes TFG ubiquitination and drives lung metastasis of hepatocellular carcinoma.","date":"2025","source":"JHEP reports : innovation in hepatology","url":"https://pubmed.ncbi.nlm.nih.gov/41030651","citation_count":0,"is_preprint":false},{"pmid":"40871367","id":"PMC_40871367","title":"Desulfitobacterium elongatum sp. nov. NIT-TF6 Isolated from Trichloroethene-Dechlorinating Culture with Formate.","date":"2025","source":"Microorganisms","url":"https://pubmed.ncbi.nlm.nih.gov/40871367","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46942,"output_tokens":7191,"usd":0.124345},"stage2":{"model":"claude-opus-4-6","input_tokens":10938,"output_tokens":3421,"usd":0.210322},"total_usd":0.334667,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"TFG (TRK-fused gene) was identified as a fusion partner of ALK in anaplastic large cell lymphoma, generating TFG-ALK(S) and TFG-ALK(L) chimeric proteins that exhibit constitutive tyrosine kinase activity in vitro.\",\n      \"method\": \"RT-PCR cloning of fusion transcripts; in vitro tyrosine kinase assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay directly demonstrating functional activity of chimeric protein\",\n      \"pmids\": [\"10556217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The TFG coiled-coil domain mediates oligomerization of the TRK-T3 oncoprotein, which is required for constitutive, ligand-independent tyrosine kinase activation; the TFG N-terminal region is additionally required for full transforming activity, possibly through cellular localization or substrate interaction.\",\n      \"method\": \"Deletion mutagenesis of TFG domains; NIH3T3 transformation assay; biochemical analysis of oligomer formation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis combined with functional transformation and biochemical oligomerization assays\",\n      \"pmids\": [\"9488046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TFG-ALK fusion proteins (TFG-ALK(S), TFG-ALK(L), and the new TFG-ALK(XL)) have similar transforming efficiency to NPM-ALK in NIH-3T3 fibroblasts and form stable complexes with signaling proteins Grb2, Shc, and PLC-gamma.\",\n      \"method\": \"Transfection/transformation assay in NIH-3T3 cells; co-immunoprecipitation\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP and functional transformation assay with multiple TFG-ALK variants\",\n      \"pmids\": [\"11943732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The PB1 domain and an SH2-binding motif within TFG sequences outside the coiled-coil domain are required for TRK-T3 oncogenic activation, contributing to protein processing, stable complex formation, and signaling.\",\n      \"method\": \"Deletion mutagenesis; site-specific mutagenesis; biochemical and biological assays in mammalian cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with mutagenesis and functional assays defining specific domain roles\",\n      \"pmids\": [\"12584559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TFG interacts with and modulates the activity of the tyrosine phosphatase SHP-1; the SHP-1 SH2 domain associates with the TFG-derived portion of TRK-T3, while the SHP-1 catalytic domain associates with the NTRK1-derived portion, leading to down-regulation of TRK-T3 signaling.\",\n      \"method\": \"Co-immunoprecipitation; in vitro binding assays; phosphatase activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP and in vitro assays demonstrating direct interaction and functional consequence\",\n      \"pmids\": [\"15557341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TFG interacts with NEMO and TANK, two proteins involved in the NF-κB pathway, identified by yeast two-hybrid screening and confirmed by in vitro and in vivo assays; TFG enhances NF-κB activity induced by TNF-α, TANK, TRAF2, and TRAF6.\",\n      \"method\": \"Yeast two-hybrid screening; co-immunoprecipitation; NF-κB reporter assay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid confirmed by co-IP with functional reporter assay, single lab\",\n      \"pmids\": [\"16547966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TFG-1 (the C. elegans TFG ortholog) interacts directly with SEC-16, the scaffolding protein at ER exit sites, and forms hexamers that facilitate co-assembly of SEC-16 with COPII subunits; TFG-1 depletion causes marked decline in SEC-16 and COPII levels at ER exit sites and reduces protein export from the ER.\",\n      \"method\": \"Co-immunoprecipitation; hydrodynamic (sedimentation) studies; RNAi depletion with cargo secretion assay in C. elegans\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — direct biochemical interaction, hydrodynamic characterization of oligomeric state, and in vivo functional depletion with clear phenotype\",\n      \"pmids\": [\"21478858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A homozygous TFG p.R106C mutation (in the coiled-coil domain) impairs TFG self-assembly into oligomeric complexes; in cells, TFG inhibition slows ER protein secretion and alters ER morphology, disrupting peripheral ER tubule organization and collapsing the ER network onto the microtubule cytoskeleton, leading to hereditary axon degeneration.\",\n      \"method\": \"Biochemical characterization of mutant protein self-assembly; cell line secretion assays; fluorescence microscopy of ER morphology\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (biochemistry, imaging, secretion assay) in a disease-linked mutation study\",\n      \"pmids\": [\"23479643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TFG protein binds TRIM25 upon virus infection and negatively regulates RIG-I-mediated type-I IFN signaling; knockdown of TFG upregulates RIG-I- and MAVS-induced IFN and NF-κB signaling pathways and inhibits VSV replication.\",\n      \"method\": \"shRNA knockdown; reporter assays for IFN and NF-κB; VSV replication assay; co-immunoprecipitation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP and functional knockdown with defined pathway, single lab\",\n      \"pmids\": [\"23810392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A TFG p.Gly269Val mutation increases propensity of TFG to form aggregates, sequestering both mutant and wild-type TFG and depleting functional TFG; inhibition of endogenous TFG compromises protein secretion, rescuable only by wild-type but not mutant TFG.\",\n      \"method\": \"Cell transfection studies; Gaussia luciferase secretion reporter assay; aggregation analysis\",\n      \"journal\": \"Neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays in human patient mutation context with specific rescue experiment\",\n      \"pmids\": [\"25098539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Mammalian TFG forms flexible, octameric cup-like structures that self-associate into larger polymers in vitro; at the ER/ERGIC interface, TFG locally concentrates COPII-coated transport carriers and links ER exit sites to ERGIC membranes; loss of TFG dramatically slows ER protein export and causes accumulation of COPII-coated carriers throughout the cytoplasm.\",\n      \"method\": \"3D electron microscopy; in vitro polymerization assay; siRNA knockdown with secretion assay and electron tomography\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural determination by EM combined with in vitro reconstitution and in-cell functional validation\",\n      \"pmids\": [\"25586378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TFG organizes transitional ER (tER) and ER exit sites (ERESs) into larger structures; TFG is required for procollagen export from the ER but not for transport of small soluble cargoes; depletion of TFG disperses tER elements while preserving largely functional individual ERESs associated with ERGICs.\",\n      \"method\": \"siRNA depletion; live-cell imaging; procollagen secretion assay; fluorescence microscopy\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple imaging and secretion assays distinguishing cargo-specific roles\",\n      \"pmids\": [\"27184855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ALG-2 (Ca2+-binding protein) interacts with TFG through a canonical ALG-2-binding motif and promotes TFG polymerization in a Ca2+-dependent manner; ALG-2 concentrates TFG at ER exit sites and extends TFG half-life at ERES.\",\n      \"method\": \"Co-immunoprecipitation; in vitro cross-linking assay; live-cell imaging; ALG-2 overexpression\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro polymerization reconstitution plus live imaging, Ca2+-dependence demonstrated\",\n      \"pmids\": [\"27813252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A TFG p.Arg22Trp variant in the PB1 domain impairs TFG oligomerization in vitro, distinct from the coiled-coil domain R106C variant, suggesting that both PB1 and coiled-coil domains contribute to TFG complex formation and that phenotypic severity may correlate with variant location.\",\n      \"method\": \"In vitro oligomerization assay; biochemical characterization of mutant protein\",\n      \"journal\": \"European journal of human genetics : EJHG\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro oligomerization assay comparing multiple variants, single lab\",\n      \"pmids\": [\"27601211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TFG C-terminus binds directly to Sec23 (inner COPII coat subunit) through a shared interface with the outer COPII coat and cargo receptor Tango1/cTAGE5; TFG binding outcompetes these interactions in a concentration-dependent manner, promoting outer coat dissociation; TFG tethers vesicles harboring the inner COPII coat, clustering them at the ER/ERGIC interface.\",\n      \"method\": \"In vitro binding/competition assay; cryo-EM; vesicle tethering assay; cell-based co-localization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted binding competition, structural data, and functional tethering assays\",\n      \"pmids\": [\"28851831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"β-cell specific TFG knockout mice display glucose intolerance, reduced insulin secretion, smaller β-cell masses due to diminished proliferation, ER dilation (indicative of ER stress), and smaller insulin crystal diameters, demonstrating a role for TFG in maintaining pancreatic β-cell mass and secretory function.\",\n      \"method\": \"Conditional knockout mouse model; glucose tolerance test; immunohistochemistry; electron microscopy; microarray\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean tissue-specific KO with defined metabolic and structural phenotypes\",\n      \"pmids\": [\"29026155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The TFG p.R106C mutation (coiled-coil domain) alters compaction of TFG ring complexes; CRISPR-engineered human iPSC-derived neurons expressing mutant TFG at endogenous levels show specific defects in ER cargo secretion and axon fasciculation.\",\n      \"method\": \"CRISPR-Cas9 genome editing; biochemical analysis of ring complex compaction; iPSC differentiation to neurons; secretion assay; axon fasciculation assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — CRISPR editing at endogenous locus, multiple assays, disease-relevant cellular model\",\n      \"pmids\": [\"30157421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TFG interacts with FANCD2-V2 (a specific isoform of FANCD2) through TFG amino acids 5-100 and FANCD2-V2 residues 1437-1442; this interaction maintains the steady-state level of FANCD2-V2 protein and enables timely nuclear focus formation upon DNA damage. Cells lacking TFG aa5-100 fail to show proper FANCD2-V2 focus kinetics and gain carcinogenicity.\",\n      \"method\": \"Co-immunoprecipitation; deletion mutagenesis; nuclear foci assay upon DNA damage; carcinogenicity assay\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with mutagenesis and functional focus assay, single lab\",\n      \"pmids\": [\"33099537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TFG is required for autophagy flux in B cells; loss of TFG results in expanded ER, increased ER stress, higher LC3 accumulation, lower LC3-II turnover, and larger autophagosomes, indicating a block in autophagosome-lysosome fusion.\",\n      \"method\": \"CRISPR-Cas9 KO in CH12 B cells; tandem-fluorescent LC3 assay; ER stress gene expression; LC3 turnover assay\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean CRISPR KO with multiple orthogonal autophagy flux assays\",\n      \"pmids\": [\"32910713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A TFG-RET fusion (exons 1-4 of TFG fused to RET kinase domain) transforms immortalized human thyroid cells in a kinase-dependent manner; TFG-RET oligomerizes in a PB1 domain-dependent manner, and oligomerization is required for oncogenic transformation.\",\n      \"method\": \"RNA-seq fusion detection; transformation assay; kinase inhibition; PB1 domain mutagenesis; oligomerization analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — transformation assay with kinase-dependence and domain-specific mutagenesis\",\n      \"pmids\": [\"32345963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TFG interacts with TRAF3 (E3 ubiquitin ligase) and stabilizes ULK1 by competing with the ULK1-TRAF3 interaction, thereby preventing K48-linked ubiquitination and proteasomal degradation of ULK1; TFG-deficient macrophages show increased ROS, impaired ULK1 stability, and enhanced pyroptotic cell death upon LPS/nigericin stimulation.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay (K48-linkage); siRNA/shRNA knockdown; cell death assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with ubiquitination linkage determination and functional rescue experiment\",\n      \"pmids\": [\"35091545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TFG binds LC3C through a canonical LIR motif; this interaction favors LC3C-ULK1 binding, controls ULK1 puncta number and localization, and is required for proper formation of omegasomes and autophagosomes; patient fibroblasts with R106C-TFG show defects in autophagy and ULK1 puncta.\",\n      \"method\": \"Co-immunoprecipitation; LIR motif mutagenesis; autophagosome/omegasome quantification; patient-derived fibroblast assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding with mutagenesis, functional autophagy assays, and patient cell validation\",\n      \"pmids\": [\"33932238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TFG is required for virus-induced TBK1 activation and IRF3 phosphorylation/dimerization via the RIG-I pathway; TFG forms a complex with TRAF3 that enables efficient TRAF3 recruitment to MAVS following Sendai virus infection; TFG also enables the TRAF3-TFG complex to engage mTOR, allowing TBK1 to phosphorylate mTOR-S2159 and promote mTORC1 signaling during antiviral response.\",\n      \"method\": \"siRNA/shRNA knockdown; co-immunoprecipitation; IRF3 dimerization assay; Sendai virus infection; mTOR phosphorylation assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple co-IP interactions and downstream phosphorylation assays in virus-infected cells, replicated with siRNA and shRNA\",\n      \"pmids\": [\"33411856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In rat primary cortical neurons, the TFG p.R106C variant causes a kinetic delay in biosynthetic ER-to-Golgi secretory protein transport and impairs trafficking of Rab4A-positive recycling endosomes specifically in axons and dendrites, resulting in down-regulated inhibitory receptor signaling; mitochondria and lysosomes are unaffected.\",\n      \"method\": \"CRISPR-Cas9 rat model; primary neuron culture; live-cell cargo trafficking assay; Rab4A endosome quantification; inhibitory receptor signaling assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo CRISPR rat model with organelle-specific trafficking assays in primary neurons\",\n      \"pmids\": [\"36161950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of motor neuron-specific TFG (vMNTFG KO mice) causes motor function deterioration, muscle atrophy, and neuromuscular junction (NMJ) denervation in slow-twitch muscles; muscle-specific TFG KO (MUSTFG KO) does not impair movement but shows elevated denervation marker and impaired Agrin-induced AChR clustering.\",\n      \"method\": \"Cell type-specific conditional KO mouse; behavioral testing; NMJ immunostaining; electrophysiology\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two clean conditional KO models with distinct cell type-specific phenotypes\",\n      \"pmids\": [\"35121777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The low-complexity domain of TFG containing disease-related mutations G269V or P285L forms amyloid fibrils; cryo-EM structures confirm an amyloid nature with double-protofilament cores, and mutant sequences show increased amyloid propensity compared to wild-type.\",\n      \"method\": \"Cryo-EM structure determination; in vitro fibril formation assay; bioinformatic amyloid propensity prediction\",\n      \"journal\": \"PNAS nexus\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures with in vitro reconstitution demonstrating amyloid fibril formation\",\n      \"pmids\": [\"38077690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TFG regulates the rate of inner COPII coat (Sec23) recruitment to ER budding sites; in TFG-deficient cells, Sec23 accumulates more rapidly at ER subdomains, potentially altering GTP hydrolysis timing on Sar1 and delaying anterograde trafficking of secretory cargoes.\",\n      \"method\": \"Live-cell TIRF microscopy of COPII dynamics; siRNA knockdown; secretion assay for multiple cargoes\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — quantitative live imaging of coat dynamics with functional secretion assays\",\n      \"pmids\": [\"38985515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TFG self-organizes under physiological conditions to form a hollow, anisotropic condensate that matches the dimensions of the ER-Golgi interface; regularly spaced hydrophobic residues control condensation; the condensate acts as a molecular sieve allowing COPII (anterograde) access to the interior while restricting COPI (retrograde) coats, spatially compartmentalizing the early secretory pathway.\",\n      \"method\": \"Biophysical condensate characterization; size-exclusion assay with fluorescent COPII/COPI probes; in vitro reconstitution; cell cycle regulation analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution of condensate with molecular sieve function validated by size-selective exclusion assays\",\n      \"pmids\": [\"40253417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Reintroduction of wild-type TFG specifically into synapsin 1-positive neurons (but not GFAP-positive glia) via gene therapy provides robust protection against motor neuron disease in TFG p.R106C rats, demonstrating that TFG pathology in HSP is cell-autonomous to neurons.\",\n      \"method\": \"Cell type-specific AAV gene therapy in CRISPR rat model; quantitative gait analysis; astrocyte reactivity assessment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-specific rescue in vivo distinguishing neuronal vs glial contributions\",\n      \"pmids\": [\"39527745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"X-ray crystallography and cryo-EM reveal that TFG forms octameric ring complexes through a network of electrostatic and hydrophobic interactions at the protomer interface; HSP-associated PB1 domain mutations disrupt this interface, destabilizing octamers and ultimately causing axonopathy.\",\n      \"method\": \"X-ray crystallography; cryo-EM structure determination; in vivo genetic analysis in disease model\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — dual structural methods (X-ray + cryo-EM) with functional disease validation\",\n      \"pmids\": [\"39574627\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FBXO45 E3 ligase promotes TFG Lys103 ubiquitination, increasing TFG stability; stabilized TFG facilitates binding of transcription factor ATF2, which upregulates NF-κB p65, promoting HCC cell migration, invasion, and lung metastasis.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination site mapping (Lys103); overexpression/knockdown; orthotopic xenograft model; ATF2-NF-κB reporter\",\n      \"journal\": \"JHEP reports : innovation in hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ubiquitination site mapped and functional consequence in vivo demonstrated, single lab\",\n      \"pmids\": [\"41030651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Xenopus TFG (xTFG) interacts with SH3 domains of Src, PLCγ, and the p85 subunit of PI3-kinase through a conserved SH3-binding motif, identifying TFG as an SH3 domain-binding protein.\",\n      \"method\": \"SH3 domain pulldown; mRNA microinjection overexpression in Xenopus embryos\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pulldown assay demonstrating SH3 binding, ortholog study\",\n      \"pmids\": [\"10861999\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TFG (Trk-fused gene) is a scaffolding protein that self-assembles into octameric ring complexes—and at physiological concentrations forms a hollow condensate—at the ER/ERGIC interface, where it directly binds the inner COPII coat subunit Sec23 to regulate the kinetics of COPII assembly/disassembly, cluster anterograde transport carriers, and facilitate ER-to-Golgi cargo export (including procollagen); it also interacts with SEC-16 to support ER exit site organization, binds LC3C via a LIR motif to link the secretory pathway to autophagosome biogenesis, associates with TRAF3 to promote antiviral innate immune signaling via TBK1-IRF3 and ULK1 stabilization, and when its oligomeric assembly is disrupted by disease-associated mutations (e.g., p.R106C, p.P285L, p.G269V) causes ER dysfunction, impaired secretory and endosomal trafficking in neurons, and progressive neurodegeneration in a cell-autonomous (neuronal) manner.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TFG is a self-assembling scaffolding protein that forms octameric ring complexes and hollow condensates at the ER–ERGIC interface, where it organizes COPII-coated transport carriers, regulates inner coat (Sec23) dynamics, and spatially compartmentalizes anterograde from retrograde trafficking to control ER-to-Golgi cargo export including procollagen [PMID:25586378, PMID:28851831, PMID:38985515, PMID:40253417]. TFG binds SEC-16 to maintain ER exit site architecture, interacts with LC3C via a LIR motif to coordinate autophagosome biogenesis through ULK1 regulation, and associates with TRAF3 to promote TBK1–IRF3 antiviral signaling and stabilize ULK1 against proteasomal degradation [PMID:21478858, PMID:33932238, PMID:33411856, PMID:35091545]. Disease-associated mutations in the PB1 or coiled-coil domains (e.g., R106C, G269V, P285L) disrupt oligomerization or promote amyloid fibril formation, impairing ER secretory and endosomal trafficking in a neuron-autonomous manner and causing hereditary spastic paraplegia and related axonopathies [PMID:23479643, PMID:36161950, PMID:38077690, PMID:39527745].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that TFG possesses a coiled-coil domain that drives oligomerization, and that this self-assembly is essential for constitutive activation of oncogenic TRK-T3, defined TFG's core biochemical property — homo-oligomerization — and its first known functional consequence.\",\n      \"evidence\": \"Deletion mutagenesis, NIH3T3 transformation assay, and biochemical oligomerization analysis\",\n      \"pmids\": [\"9488046\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Native cellular function of TFG oligomerization unknown\", \"Whether oligomerization serves any non-oncogenic role unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of the PB1 domain and SH2-binding motif as additional determinants of TFG complex formation and signaling showed that TFG uses multiple domains beyond the coiled-coil for oligomerization and protein interactions.\",\n      \"evidence\": \"Site-specific and deletion mutagenesis with biological and biochemical assays in mammalian cells\",\n      \"pmids\": [\"12584559\", \"10861999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous binding partners of the PB1 domain in non-oncogenic context not identified\", \"Structural basis of PB1-mediated oligomerization unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery that TFG interacts with NEMO and TANK and enhances NF-κB signaling provided the first evidence of a native TFG signaling function outside oncogenic fusions.\",\n      \"evidence\": \"Yeast two-hybrid screen, co-immunoprecipitation, NF-κB reporter assay\",\n      \"pmids\": [\"16547966\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which TFG enhances NF-κB not resolved\", \"Physiological relevance in vivo not tested\", \"Single-lab finding without independent replication\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstration that C. elegans TFG-1 directly binds SEC-16 and is required for COPII and SEC-16 levels at ER exit sites established TFG's primary physiological role: organizing COPII-dependent ER export.\",\n      \"evidence\": \"Co-immunoprecipitation, sedimentation analysis showing hexamers, RNAi depletion with cargo secretion assay in C. elegans\",\n      \"pmids\": [\"21478858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian validation needed\", \"Whether TFG directly contacts COPII subunits unknown\", \"Mechanism of SEC-16 stabilization unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linking the TFG p.R106C mutation to impaired oligomerization, slowed ER secretion, disrupted ER morphology, and hereditary axon degeneration established TFG as a disease gene for hereditary spastic paraplegia and connected its oligomeric assembly to neuronal health.\",\n      \"evidence\": \"Biochemical self-assembly assays, cell-based secretion assays, fluorescence microscopy of ER morphology in patient-derived and manipulated cells\",\n      \"pmids\": [\"23479643\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether defect is cell-autonomous to neurons not established\", \"Downstream neurotoxic mechanism (ER stress vs. trafficking defect) not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Structural and functional studies revealing that mammalian TFG forms octameric cup-like structures that polymerize and concentrate COPII carriers at the ER–ERGIC interface defined the architecture by which TFG organizes early secretory trafficking.\",\n      \"evidence\": \"3D electron microscopy, in vitro polymerization, siRNA knockdown with electron tomography and secretion assay\",\n      \"pmids\": [\"25586378\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct COPII coat subunit binding interface not mapped\", \"How TFG polymers spatially segregate coated carriers unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showing that TFG is specifically required for procollagen but not small soluble cargo export revealed cargo-selective roles, while ALG-2 was identified as a calcium-dependent regulator of TFG polymerization at ER exit sites.\",\n      \"evidence\": \"siRNA depletion with live-cell imaging and procollagen secretion assays; ALG-2 co-IP and in vitro cross-linking polymerization assays\",\n      \"pmids\": [\"27184855\", \"27813252\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How cargo selectivity arises mechanistically unclear\", \"Whether ALG-2–TFG regulation is required in vivo untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that TFG's C-terminus binds Sec23 on the same interface used by the outer COPII coat and Tango1/cTAGE5, competing for this site in a concentration-dependent manner, provided a molecular mechanism for TFG-driven outer coat disassembly and vesicle tethering at the ER–ERGIC boundary.\",\n      \"evidence\": \"In vitro binding competition, cryo-EM, vesicle tethering assay, cell-based co-localization\",\n      \"pmids\": [\"28851831\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetic parameters of competition in live cells not measured\", \"Whether Tango1 and TFG act sequentially or in parallel unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"CRISPR-engineered iPSC-derived human neurons with endogenous TFG R106C confirmed that the mutation alters ring complex compaction and causes cargo secretion and axon fasciculation defects, validating disease-relevance in a human neuronal model.\",\n      \"evidence\": \"CRISPR-Cas9 genome editing in iPSCs, biochemical ring analysis, neuronal secretion and fasciculation assays\",\n      \"pmids\": [\"30157421\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo validation in animal model pending\", \"Whether fasciculation defect is primary or secondary to secretion impairment unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Convergent studies established TFG as a dual regulator linking the secretory pathway to autophagy and innate immunity: TFG binds LC3C via a LIR motif to control ULK1 puncta formation and autophagosome biogenesis, interacts with TRAF3 to stabilize ULK1 against K48-ubiquitination, and promotes TBK1–IRF3 antiviral signaling by facilitating TRAF3 recruitment to MAVS.\",\n      \"evidence\": \"LIR motif mutagenesis and autophagosome quantification; co-IP with ubiquitination linkage assays; IRF3 dimerization and mTOR phosphorylation upon Sendai virus infection\",\n      \"pmids\": [\"33932238\", \"35091545\", \"33411856\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether autophagy and innate immune functions are coupled or independent unclear\", \"Structural basis of TFG–TRAF3 interaction not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The TFG R106C mutation in rat primary neurons was shown to impair both biosynthetic ER-to-Golgi transport and Rab4A-positive recycling endosome trafficking specifically in axons and dendrites, broadening disease pathology beyond secretory to endosomal compartments.\",\n      \"evidence\": \"CRISPR rat model, live-cell cargo trafficking and Rab4A endosome quantification in primary cortical neurons\",\n      \"pmids\": [\"36161950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking TFG to Rab4A endosomes unresolved\", \"Whether endosomal defect or secretory defect is the primary pathogenic driver unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Cryo-EM structures demonstrated that disease-associated mutations G269V and P285L in TFG's low-complexity domain promote amyloid fibril formation, revealing a gain-of-toxic-function mechanism distinct from loss of oligomerization.\",\n      \"evidence\": \"Cryo-EM fibril structure determination, in vitro amyloid formation assay\",\n      \"pmids\": [\"38077690\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether amyloid fibrils form in vivo in patient neurons not shown\", \"Relative contribution of amyloid gain-of-function vs. loss of ring function to disease unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Multiple studies established that TFG regulates COPII coat dynamics (controlling Sec23 recruitment rate), forms a hollow condensate that acts as a molecular sieve permitting COPII but excluding COPI at the ER–ERGIC interface, and that neuron-specific gene therapy rescues motor neuron disease in R106C rats, confirming cell-autonomous neuronal pathology.\",\n      \"evidence\": \"Live-cell TIRF microscopy of coat dynamics; in vitro condensate reconstitution with size-selective exclusion assays; cell type-specific AAV gene therapy in CRISPR rat model\",\n      \"pmids\": [\"38985515\", \"40253417\", \"39527745\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How condensate formation is regulated in vivo (cell cycle, signaling) incompletely understood\", \"Whether COPI exclusion is the primary mechanism preventing retrograde coat invasion not formally tested in cells\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include how TFG's secretory, autophagy, and innate immune functions are coordinated or prioritized in different cell types, the structural basis of disease-specific mutations in full-length octameric context, and whether therapeutic intervention can target condensate or oligomer integrity to treat neurodegeneration.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Integration of secretory, autophagy, and immune functions into a unified model lacking\", \"Full-length octamer structure with disease mutations not yet resolved at atomic resolution in peer-reviewed literature\", \"No therapeutic strategy targeting TFG condensate properties validated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [6, 10, 14, 27]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [14, 20, 21, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [6, 7, 10, 11, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [10, 14, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [6, 10, 11, 14, 26, 27]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [18, 21]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [22]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [6, 10, 14, 26]}\n    ],\n    \"complexes\": [\n      \"TFG octameric ring\",\n      \"COPII coat complex (via Sec23 binding)\"\n    ],\n    \"partners\": [\n      \"SEC23A\",\n      \"SEC16\",\n      \"ALG2\",\n      \"LC3C\",\n      \"TRAF3\",\n      \"NEMO\",\n      \"TANK\",\n      \"TRIM25\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}