{"gene":"ASPSCR1","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2001,"finding":"ASPSCR1 (ASPL) at 17q25 is fused in-frame to the TFE3 transcription factor gene at Xp11.2 via the der(17)t(X;17)(p11.2;q25) translocation in alveolar soft part sarcoma, generating ASPL-TFE3 fusion proteins (type 1 and type 2) that retain the TFE3 DNA-binding domain, implying transcriptional deregulation as the oncogenic mechanism. The ASPL protein contains a UBX-like domain in its C-terminal region.","method":"Southern blotting, RT-PCR, cDNA sequencing, FISH","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal RT-PCR in 12/12 ASPS cases plus FISH and sequencing; independently replicated across multiple subsequent studies","pmids":["11244503"],"is_preprint":false},{"year":2007,"finding":"TUG (ASPSCR1) directly binds GLUT4 via a large intracellular loop in GLUT4, retains GLUT4 in perinuclear (non-endosomal) membranes in unstimulated 3T3-L1 adipocytes, and is required for intracellular sequestration of GLUT4; siRNA-mediated depletion or dominant-negative TUG expression causes GLUT4 translocation and enhanced glucose uptake resembling insulin stimulation.","method":"siRNA knockdown, dominant-negative overexpression, fluorescence microscopy, glucose uptake assay, direct binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KD, DN fragment, microscopy, binding assay) in a single focused study, replicated by subsequent work","pmids":["17202135"],"is_preprint":false},{"year":2011,"finding":"TUG (ASPSCR1) binds p97/VCP at its N-terminal domain via an extended sequence comprising three TUG regions (not the UBX domain alone), causes stoichiometric conversion of p97 hexamers into monomers (hexamer disassembly), and localizes to the ER-to-Golgi intermediate compartment (ERGIC) and ER exit sites. TUG overexpression accumulates ubiquitylated substrates and targets p97 to the nucleus; TUG depletion impairs Golgi reassembly after brefeldin A removal.","method":"Co-immunoprecipitation, in vitro binding/disassembly assays, siRNA knockdown, immunofluorescence, brefeldin A washout assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro hexamer disassembly reconstitution plus domain mapping plus functional cellular assays in a single study","pmids":["22207755"],"is_preprint":false},{"year":2012,"finding":"Insulin stimulates site-specific endoproteolytic cleavage of TUG (ASPSCR1) in adipocytes in a TC10α-dependent manner, separating an N-terminal GLUT4-binding fragment (generating an 18-kDa ubiquitin-like modifier called TUGUL) from a C-terminal fragment that had bound the Golgi matrix anchor. Intact TUG links GLUT4 to PIST (a TC10α effector) and to Golgin-160 via its C-terminus. A cleavage-resistant TUG mutant does not support insulin-responsive GLUT4 translocation or glucose uptake.","method":"Site-specific mutagenesis (cleavage-resistant mutant), RNAi (TC10α knockdown), co-immunoprecipitation, immunoblotting, glucose uptake assay, cell fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — cleavage-resistant mutant functional rescue, RNAi epistasis, and biochemical characterization; multiple orthogonal methods; replicated in subsequent studies","pmids":["22610098"],"is_preprint":false},{"year":2013,"finding":"Muscle-specific transgenic expression of the TUG C-terminal UBX-Cter fragment in mice causes constitutive TUG proteolysis and GLUT4 translocation to T-tubules during fasting, decreases fasting plasma glucose and insulin, increases whole-body glucose turnover, and elevates oxygen consumption and energy expenditure by 12–13%, demonstrating that the TUG proteolytic pathway regulates systemic glucose homeostasis and energy metabolism in muscle.","method":"Tissue-specific transgenic mouse model, hyperinsulinemic clamp, 2-deoxyglucose uptake, cell fractionation, indirect calorimetry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic mouse model with multiple physiological readouts","pmids":["23744065"],"is_preprint":false},{"year":2013,"finding":"ASPSCR1-TFE3 fusion protein localizes predominantly to the nucleus, functions as a stronger transcriptional transactivator than native TFE3, binds 2193 genomic loci genome-wide, and up-regulates direct target genes including MET, CYP17A1, and UPP1. RNAi screening identified 11 additional ASPSCR1-TFE3 target genes that contribute to cancer cell proliferation.","method":"Nuclear localization assay, genome-wide ChIP-seq (location analysis), inducible expression system, RNAi high-throughput screen, reporter assay","journal":"The Journal of pathology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-seq plus expression profiling plus functional RNAi screen with multiple validated targets in a single study","pmids":["23288701"],"is_preprint":false},{"year":2015,"finding":"TUG (ASPSCR1) C-terminus is acetylated; acetylation reduces binding of TUG to ACBD3 (but not Golgin-160), and mutation of acetylated residues impairs insulin-responsive GLUT4 trafficking. SIRT2 deacetylase binds TUG, deacetylates it, and its overexpression redistributes GLUT4 and IRAP to the plasma membrane. SIRT2 knockout mice show increased TUG acetylation and proteolytic processing and enhanced glucose disposal.","method":"Mass spectrometry/acetylation detection, co-immunoprecipitation, site-directed mutagenesis, RNAi, SIRT2 knockout mouse, glucose tolerance test","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — PTM identification, writer/eraser identified (SIRT2), mutagenesis, and in vivo mouse validation in one study","pmids":["25561724"],"is_preprint":false},{"year":2015,"finding":"TUG proteolysis controls IRAP (insulin-regulated aminopeptidase) targeting to T-tubules in muscle as well as GLUT4 translocation; IRAP binds TUG through a short peptide previously shown critical for GLUT4 intracellular retention. Constitutive TUG proteolysis in transgenic mice increases vasopressin degradation in vivo, demonstrating that TUG controls coordinated translocation of both GLUT4 and IRAP vesicle cargoes.","method":"Transgenic mouse model, recombinant protein binding/mapping, co-immunoprecipitation, cell fractionation, vasopressin/copeptin assay, renal AQP2 measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse model with multiple physiological and biochemical readouts, direct binding mapping","pmids":["25944897"],"is_preprint":false},{"year":2016,"finding":"ASPSCR1 (ASPL) contains an extended UBX domain (eUBX) that is critical for disassembly of p97 hexamers, generating stable p97:ASPL heterotetramers. Hexamer disassembly is accompanied by reorientation of the p97 D2 ATPase domain and loss of D2 ATPase activity. Overproduction of ASPL disrupts p97 hexamer function in ERAD.","method":"Quantitative interaction mapping, high-resolution structural studies (X-ray crystallography), biochemical disassembly assays, ATPase activity assay, ERAD functional assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus biochemical reconstitution plus mutagenesis (eUBX domain) plus functional cellular assay in one study","pmids":["27762274"],"is_preprint":false},{"year":2016,"finding":"ASPL-TFE3 fusion oncoprotein functions as an aberrant transcription factor that directly activates p21 (CDKN1A) expression in a p53-independent manner through binding to the p21 promoter, causing cell cycle arrest and cellular senescence; senescent cells secrete proinflammatory SASP cytokines.","method":"Ectopic expression, luciferase reporter assay, RT-PCR, senescence-associated β-galactosidase staining, RNAi (p21 knockdown), tetracycline-inducible expression in mesenchymal stem cells","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus RNAi rescue plus inducible expression; single lab, multiple methods","pmids":["27673450"],"is_preprint":false},{"year":2016,"finding":"Mutant p97 (disease-causing R93C, R155H, R155C) reduces the efficiency of UBXD9/TUG (ASPSCR1)/ASPL-mediated p97 hexamer disassembly into monomers, with species- and mutation-specific differences in binding affinity (assessed by surface plasmon resonance) and ATP-dependent interactions.","method":"Co-immunoprecipitation, pull-down assay, surface plasmon resonance, sucrose density gradient ultracentrifugation, ATPase activity measurement","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SPR quantitative binding plus functional disassembly assays; single lab","pmids":["27132113"],"is_preprint":false},{"year":2018,"finding":"The muscle splice form of Usp25 (Usp25m), but not the Usp25a isoform, is the protease required for insulin-stimulated TUG cleavage and GLUT4 translocation in adipocytes. Usp25m binds TUG and GLUT4, colocalizes with TUG in unstimulated cells, and dissociates from TUG-bound vesicles after insulin. TUG cleavage generates TUGUL, which modifies the KIF5B kinesin motor, and this is required to load GLUT4 onto microtubule-based motors. TUG proteolysis and Usp25m are reduced in insulin-resistant adipose tissue.","method":"Co-immunoprecipitation, RNAi knockdown, transfection reconstitution (isoform specificity), in vitro proteolysis assay, immunofluorescence/colocalization, diet-induced insulin resistance mouse model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — protease identified by reconstitution (isoform-specific), substrate modification (KIF5B by TUGUL) identified, in vivo disease-model validation; multiple orthogonal methods","pmids":["29773651"],"is_preprint":false},{"year":2021,"finding":"Insulin-stimulated TUG (Aspscr1) cleavage in muscle releases a C-terminal cleavage product that enters the nucleus, binds PPARγ and PGC-1α, and regulates gene expression to promote lipid oxidation and thermogenesis, upregulating sarcolipin in muscle and UCP1 in adipocytes. This pathway is independent of PI3K/Akt. The PPARγ2 Pro12Ala polymorphism (associated with reduced diabetes risk) enhances TUG binding. The ATE1 arginyltransferase regulates stability of the TUG C-terminal product via an N-degron pathway. Muscle-specific Tug knockout and constitutive-cleavage mouse models confirmed regulation of insulin-stimulated glucose uptake and whole-body energy expenditure.","method":"Muscle-specific Aspscr1 knockout mice, muscle-specific constitutive TUG cleavage mice, nuclear co-immunoprecipitation (PPARγ/PGC-1α binding), gene expression analysis, indirect calorimetry, ATE1 knockout, glucose/insulin tolerance tests","journal":"Nature metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — two complementary genetic mouse models, binding partners identified, PTM writer identified (ATE1), multiple orthogonal methods in one study","pmids":["33686286"],"is_preprint":false},{"year":2022,"finding":"TUG (Aspscr1, UBXD9) proteins act as central tethers that trap GLUT4 storage vesicles at the Golgi matrix via N-terminal GLUT4-binding and C-terminal Golgi matrix-binding; insulin triggers Usp25m-mediated endoproteolytic cleavage generating the TUGUL ubiquitin-like modifier (N-terminal product) that modifies KIF5B kinesin in adipocytes, enabling microtubule-based vesicle transport to the cell surface. After cleavage, the TUG C-terminal product is extracted from the Golgi matrix by p97/VCP ATPase. In both muscle and fat, the C-terminal product enters the nucleus to bind PPARγ/PGC-1α and regulate fatty acid oxidation. Stability of the C-terminal product is regulated by Ate1-dependent N-degron pathway.","method":"Review integrating genetic mouse models, biochemical reconstitution, co-immunoprecipitation, and functional assays from multiple prior studies","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Strong — mechanistic synthesis review citing primary experimental data; confidence is Medium because this paper itself is a review, not new primary data","pmids":["36246906"],"is_preprint":false},{"year":2006,"finding":"The N-terminal region of TUG (ASPSCR1; residues 10–83) adopts a ubiquitin-like (beta-grasp) fold as determined by NMR spectroscopy. This UBL1 domain lacks the C-terminal diglycine motif and canonical ubiquitin 'Ile-44 hydrophobic face', suggesting it functions as a protein-protein interaction module rather than as a covalent modifier.","method":"NMR spectroscopy (solution structure and backbone dynamics)","journal":"Protein science","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — NMR structure of isolated domain, single study, no functional mutagenesis validation in the same paper","pmids":["16501224"],"is_preprint":false},{"year":2023,"finding":"ASPSCR1::TFE3 fusion transcription factor is dispensable for in vitro tumor cell maintenance but is required for in vivo tumor development via angiogenesis. ASPSCR1::TFE3 associates with super-enhancers (SEs) at its DNA binding sites; its loss causes SE redistribution affecting angiogenesis pathway genes. ASPSCR1::TFE3 transcriptionally activates Pdgfb, Rab27a, Sytl2, and Vwf; Rab27a and Sytl2 promote angiogenic factor trafficking to facilitate ASPS vascular network construction.","method":"Conditional knockdown (in vitro vs. in vivo comparison), CUT&RUN/ChIP-seq (SE mapping), epigenomic CRISPR/dCas9 functional screen, gene expression analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic loss-of-function, genome-wide epigenomic mapping, and CRISPR functional screen with mechanistic validation; multiple orthogonal methods","pmids":["37029109"],"is_preprint":false},{"year":2021,"finding":"ASPL-TFE3 fusion protein translocates to the nucleus in renal cell carcinoma cells and transcriptionally activates lysosome-autophagy pathway genes by binding their promoters. This autophagy activation enables energy stress evasion by promoting protein and lipid utilization. The fusion protein escapes regulation by the classic mTOR-TFE3 signaling axis and instead activates phospho-mTOR and its downstream targets.","method":"Nuclear localization assay, ChIP/promoter binding assay, autophagy flux assay, mTOR pathway inhibition, in vitro and in vivo proliferation assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter binding plus functional pathway assays; single lab, multiple methods","pmids":["33846569"],"is_preprint":false}],"current_model":"ASPSCR1 (TUG/ASPL/UBXD9) is a multifunctional tethering protein that, in fat and muscle cells, traps GLUT4 storage vesicles at the Golgi matrix by binding GLUT4/IRAP cargoes via its N-terminus and Golgi matrix proteins (Golgin-160, ACBD3) via its acetylated C-terminus; insulin activates the Usp25m protease to cleave TUG, releasing the vesicles—with the N-terminal TUGUL product modifying KIF5B kinesin to drive microtubule-based vesicle transport to the plasma membrane, and the C-terminal product entering the nucleus to bind PPARγ/PGC-1α and promote fatty acid oxidation and thermogenesis via an ATE1-regulated N-degron pathway. Separately, TUG contains an extended UBX domain that binds the p97/VCP AAA-ATPase N-terminal domain and stoichiometrically disassembles p97 hexamers at ERGIC/ER exit sites, regulating membrane trafficking and Golgi reassembly. In alveolar soft part sarcoma, chromosomal translocation fuses ASPSCR1 to TFE3, producing an aberrant nuclear transcription factor that drives angiogenesis through super-enhancer remodeling, activates lysosomal/autophagy gene programs, and directly upregulates targets including p21, MET, CYP17A1, Rab27a, and Sytl2."},"narrative":{"mechanistic_narrative":"ASPSCR1 (TUG/ASPL/UBXD9) is a multifunctional tethering protein that controls insulin-regulated vesicle trafficking and that, when fused to TFE3, becomes a sarcoma-driving oncogenic transcription factor [PMID:17202135, PMID:36246906, PMID:37029109]. In fat and muscle, intact TUG traps GLUT4 storage vesicles intracellularly by binding GLUT4 through its N-terminal region and the Golgi matrix through its acetylated C-terminus, holding vesicles in perinuclear membranes until insulin acts [PMID:17202135, PMID:22610098, PMID:36246906]; its N-terminus adopts a ubiquitin-like beta-grasp fold that serves as a protein-interaction module rather than a covalent modifier [PMID:16501224]. Insulin triggers site-specific endoproteolytic cleavage of TUG by the muscle splice form of the Usp25 protease in a TC10α-dependent manner, releasing vesicles for translocation; the N-terminal TUGUL product modifies the KIF5B kinesin to load cargo onto microtubule motors, while the C-terminal product enters the nucleus to bind PPARγ/PGC-1α and drive fatty acid oxidation and thermogenesis, with its stability controlled by the ATE1 N-degron pathway [PMID:22610098, PMID:29773651, PMID:33686286]. This proteolytic switch governs coordinated translocation of both GLUT4 and IRAP and regulates systemic glucose homeostasis and energy expenditure in vivo [PMID:23744065, PMID:25944897]. Independently, TUG binds the p97/VCP AAA-ATPase N-terminal domain through an extended UBX domain and stoichiometrically disassembles p97 hexamers into p97:ASPL heterotetramers with loss of D2 ATPase activity, regulating ERAD, membrane trafficking, and Golgi reassembly [PMID:22207755, PMID:27762274]. In alveolar soft part sarcoma, the der(17)t(X;17) translocation fuses ASPSCR1 in-frame to TFE3, producing a nuclear oncoprotein that acts as a strong transactivator binding thousands of genomic loci and directly upregulating MET, CYP17A1, and other targets [PMID:11244503, PMID:23288701]; in vivo it remodels super-enhancers to drive angiogenesis via Pdgfb, Rab27a, and Sytl2, activates lysosome-autophagy programs, and induces p21-dependent senescence with SASP secretion [PMID:37029109, PMID:33846569, PMID:27673450].","teleology":[{"year":2001,"claim":"Established that ASPSCR1 is recurrently disrupted by chromosomal translocation, defining its oncogenic relevance and revealing a C-terminal UBX-like domain.","evidence":"RT-PCR, cDNA sequencing, and FISH across alveolar soft part sarcoma cases","pmids":["11244503"],"confidence":"High","gaps":["Did not establish how the fusion deregulates transcription","Did not characterize the normal function of the UBX-like domain"]},{"year":2006,"claim":"Determined that the N-terminal TUG region folds as a ubiquitin-like domain lacking the diglycine motif, indicating a protein-interaction rather than conjugation role.","evidence":"NMR solution structure of the isolated UBL1 domain","pmids":["16501224"],"confidence":"Medium","gaps":["No functional mutagenesis in the same study","Binding partners of the UBL1 domain not identified structurally"]},{"year":2007,"claim":"Identified TUG's physiological role: it directly binds GLUT4 and sequesters it intracellularly, making it a gatekeeper of insulin-responsive glucose uptake.","evidence":"siRNA knockdown, dominant-negative fragment, microscopy, binding and glucose-uptake assays in 3T3-L1 adipocytes","pmids":["17202135"],"confidence":"High","gaps":["Mechanism of insulin-triggered release not defined","Did not identify the C-terminal anchoring partner"]},{"year":2011,"claim":"Revealed a trafficking-regulatory function distinct from GLUT4: TUG binds the p97/VCP N-domain and disassembles p97 hexamers at the ERGIC/ER exit sites.","evidence":"Co-IP, in vitro disassembly assays, domain mapping, and brefeldin A washout in cells","pmids":["22207755"],"confidence":"High","gaps":["Structural basis of hexamer disassembly not resolved","Relationship between p97 binding and GLUT4 tethering unclear"]},{"year":2012,"claim":"Defined the molecular switch: insulin drives site-specific TUG cleavage that severs the GLUT4-binding from the Golgi-anchoring half, releasing vesicles.","evidence":"Cleavage-resistant mutant rescue, TC10α RNAi epistasis, Co-IP, and glucose-uptake assays","pmids":["22610098"],"confidence":"High","gaps":["The protease responsible was not identified","Fate of the cleavage products not established"]},{"year":2013,"claim":"Showed the TUG proteolytic pathway controls systemic physiology, linking cleavage to glucose turnover and whole-body energy expenditure in muscle.","evidence":"Muscle-specific UBX-Cter transgenic mice, hyperinsulinemic clamp, and indirect calorimetry","pmids":["23744065"],"confidence":"High","gaps":["Did not define the nuclear effectors of energy expenditure","Mechanism connecting cleavage to thermogenesis unresolved"]},{"year":2013,"claim":"Demonstrated that the ASPSCR1-TFE3 fusion is a nuclear transactivator with genome-wide binding and proliferation-promoting targets, providing the transcriptional mechanism implied in 2001.","evidence":"Nuclear localization, genome-wide ChIP-seq, inducible expression, and an RNAi target screen","pmids":["23288701"],"confidence":"High","gaps":["Did not address in vivo tumor requirement","Chromatin/enhancer mechanism not yet defined"]},{"year":2015,"claim":"Established post-translational control of TUG by acetylation, with SIRT2 deacetylation tuning GLUT4/IRAP trafficking and proteolysis.","evidence":"Acetylation MS, Co-IP, mutagenesis, RNAi, and SIRT2 knockout mice with glucose tolerance tests","pmids":["25561724"],"confidence":"High","gaps":["Acetyltransferase (writer) not identified","How acetylation influences cleavage kinetics unresolved"]},{"year":2015,"claim":"Extended TUG's cargo control beyond GLUT4 to IRAP, showing coordinated regulation of multiple vesicle cargoes with measurable physiological consequences.","evidence":"Transgenic mice, recombinant binding mapping, Co-IP, and in vivo vasopressin/copeptin assays","pmids":["25944897"],"confidence":"High","gaps":["Full cargo repertoire not enumerated","Tissue specificity of cargo selection unclear"]},{"year":2016,"claim":"Provided the structural mechanism of p97 regulation: an extended UBX domain converts hexamers into stable heterotetramers, reorienting D2 and abolishing its ATPase activity.","evidence":"X-ray crystallography, quantitative interaction mapping, ATPase and ERAD assays","pmids":["27762274"],"confidence":"High","gaps":["Physiological trigger for disassembly in cells not defined","Reversal of disassembly not characterized"]},{"year":2016,"claim":"Connected ASPSCR1-mediated p97 disassembly to disease, showing pathogenic p97 mutations reduce disassembly efficiency.","evidence":"Co-IP, pull-down, surface plasmon resonance, and density-gradient disassembly assays","pmids":["27132113"],"confidence":"Medium","gaps":["Single lab without orthogonal cellular validation","Disease relevance of altered disassembly not demonstrated in vivo"]},{"year":2016,"claim":"Showed the ASPL-TFE3 fusion drives p53-independent p21 activation, cell-cycle arrest, and senescence with SASP secretion, adding a growth-modulatory facet to the oncoprotein.","evidence":"Reporter assay, RT-PCR, SA-β-gal staining, p21 RNAi rescue, and inducible expression in MSCs","pmids":["27673450"],"confidence":"Medium","gaps":["Single-lab evidence","Reconciliation of senescence with tumor proliferation unresolved"]},{"year":2018,"claim":"Identified the protease and the downstream effector of TUG cleavage: muscle Usp25m generates TUGUL, which modifies KIF5B to load GLUT4 onto microtubule motors, and is reduced in insulin resistance.","evidence":"Isoform-specific reconstitution, Co-IP, in vitro proteolysis, colocalization, and diet-induced insulin resistance mice","pmids":["29773651"],"confidence":"High","gaps":["Mechanism of TUGUL attachment to KIF5B not structurally defined","Regulation of Usp25m isoform expression unresolved"]},{"year":2021,"claim":"Defined the nuclear function of the C-terminal cleavage product, linking TUG proteolysis to PPARγ/PGC-1α-driven lipid oxidation/thermogenesis and to ATE1 N-degron-controlled stability.","evidence":"Muscle-specific knockout and constitutive-cleavage mice, nuclear Co-IP, calorimetry, and ATE1 knockout","pmids":["33686286"],"confidence":"High","gaps":["Direct transcriptional targets of the nuclear product not enumerated","Mechanism coupling cleavage to nuclear entry unresolved"]},{"year":2021,"claim":"Showed the ASPL-TFE3 fusion in renal cell carcinoma activates lysosome-autophagy genes and bypasses mTOR-TFE3 regulation to enable energy-stress evasion.","evidence":"Nuclear localization, promoter binding, autophagy flux, mTOR inhibition, and proliferation assays","pmids":["33846569"],"confidence":"Medium","gaps":["Single-lab evidence","Mechanism of escape from mTOR regulation not fully defined"]},{"year":2023,"claim":"Established that ASPSCR1::TFE3 is dispensable in vitro but required for in vivo tumor angiogenesis through super-enhancer remodeling and activation of vesicle-trafficking genes.","evidence":"Conditional in vivo knockdown, CUT&RUN/ChIP-seq super-enhancer mapping, and dCas9 epigenomic CRISPR screen","pmids":["37029109"],"confidence":"High","gaps":["Direct mechanism of super-enhancer recruitment unresolved","Whether normal ASPSCR1 functions contribute to fusion activity unclear"]},{"year":null,"claim":"How the normal trafficking/p97-regulatory functions of ASPSCR1 relate to the oncogenic activity of the ASPSCR1-TFE3 fusion, and whether retained ASPSCR1 domains shape fusion behavior, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No study connects TUG's tethering/p97 biology to fusion oncogenesis","Contribution of the UBX/UBL domains to the fusion protein not tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,3,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,8]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,5,15]},{"term_id":"GO:0031386","term_label":"protein tag activity","supporting_discovery_ids":[11,13]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2,8]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5,12,16]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,6]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[1,3,7]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,11,13]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,12,15]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,15,16]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,8]}],"complexes":["p97/VCP:ASPL heterotetramer","GLUT4 storage vesicle tethering complex","ASPSCR1-TFE3 fusion transcription factor"],"partners":["GLUT4","VCP","GOLGIN-160","ACBD3","USP25","KIF5B","SIRT2","PPARG"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BZE9","full_name":"Tether containing UBX domain for GLUT4","aliases":["Alveolar soft part sarcoma chromosomal region candidate gene 1 protein","Alveolar soft part sarcoma locus","Renal papillary cell carcinoma protein 17","UBX domain-containing protein 9"],"length_aa":553,"mass_kda":60.2,"function":"Tethering protein that sequesters GLUT4-containing vesicles in the cytoplasm in the absence of insulin. Modulates the amount of GLUT4 that is available at the cell surface (By similarity). Enhances VCP methylation catalyzed by VCPKMT","subcellular_location":"Endomembrane system; Endoplasmic reticulum-Golgi intermediate compartment membrane; Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9BZE9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ASPSCR1","classification":"Not Classified","n_dependent_lines":23,"n_total_lines":1208,"dependency_fraction":0.01903973509933775},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DNAJC24","stoichiometry":0.2},{"gene":"VCP","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ASPSCR1","total_profiled":1310},"omim":[{"mim_id":"615260","title":"VALOSIN-CONTAINING PROTEIN LYSINE METHYLTRANSFERASE; VCPKMT","url":"https://www.omim.org/entry/615260"},{"mim_id":"606243","title":"ALVEOLAR SOFT PART SARCOMA; 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The ASPL protein contains a UBX-like domain in its C-terminal region.\",\n      \"method\": \"Southern blotting, RT-PCR, cDNA sequencing, FISH\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal RT-PCR in 12/12 ASPS cases plus FISH and sequencing; independently replicated across multiple subsequent studies\",\n      \"pmids\": [\"11244503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TUG (ASPSCR1) directly binds GLUT4 via a large intracellular loop in GLUT4, retains GLUT4 in perinuclear (non-endosomal) membranes in unstimulated 3T3-L1 adipocytes, and is required for intracellular sequestration of GLUT4; siRNA-mediated depletion or dominant-negative TUG expression causes GLUT4 translocation and enhanced glucose uptake resembling insulin stimulation.\",\n      \"method\": \"siRNA knockdown, dominant-negative overexpression, fluorescence microscopy, glucose uptake assay, direct binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KD, DN fragment, microscopy, binding assay) in a single focused study, replicated by subsequent work\",\n      \"pmids\": [\"17202135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TUG (ASPSCR1) binds p97/VCP at its N-terminal domain via an extended sequence comprising three TUG regions (not the UBX domain alone), causes stoichiometric conversion of p97 hexamers into monomers (hexamer disassembly), and localizes to the ER-to-Golgi intermediate compartment (ERGIC) and ER exit sites. TUG overexpression accumulates ubiquitylated substrates and targets p97 to the nucleus; TUG depletion impairs Golgi reassembly after brefeldin A removal.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding/disassembly assays, siRNA knockdown, immunofluorescence, brefeldin A washout assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro hexamer disassembly reconstitution plus domain mapping plus functional cellular assays in a single study\",\n      \"pmids\": [\"22207755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Insulin stimulates site-specific endoproteolytic cleavage of TUG (ASPSCR1) in adipocytes in a TC10α-dependent manner, separating an N-terminal GLUT4-binding fragment (generating an 18-kDa ubiquitin-like modifier called TUGUL) from a C-terminal fragment that had bound the Golgi matrix anchor. Intact TUG links GLUT4 to PIST (a TC10α effector) and to Golgin-160 via its C-terminus. A cleavage-resistant TUG mutant does not support insulin-responsive GLUT4 translocation or glucose uptake.\",\n      \"method\": \"Site-specific mutagenesis (cleavage-resistant mutant), RNAi (TC10α knockdown), co-immunoprecipitation, immunoblotting, glucose uptake assay, cell fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — cleavage-resistant mutant functional rescue, RNAi epistasis, and biochemical characterization; multiple orthogonal methods; replicated in subsequent studies\",\n      \"pmids\": [\"22610098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Muscle-specific transgenic expression of the TUG C-terminal UBX-Cter fragment in mice causes constitutive TUG proteolysis and GLUT4 translocation to T-tubules during fasting, decreases fasting plasma glucose and insulin, increases whole-body glucose turnover, and elevates oxygen consumption and energy expenditure by 12–13%, demonstrating that the TUG proteolytic pathway regulates systemic glucose homeostasis and energy metabolism in muscle.\",\n      \"method\": \"Tissue-specific transgenic mouse model, hyperinsulinemic clamp, 2-deoxyglucose uptake, cell fractionation, indirect calorimetry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic mouse model with multiple physiological readouts\",\n      \"pmids\": [\"23744065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ASPSCR1-TFE3 fusion protein localizes predominantly to the nucleus, functions as a stronger transcriptional transactivator than native TFE3, binds 2193 genomic loci genome-wide, and up-regulates direct target genes including MET, CYP17A1, and UPP1. RNAi screening identified 11 additional ASPSCR1-TFE3 target genes that contribute to cancer cell proliferation.\",\n      \"method\": \"Nuclear localization assay, genome-wide ChIP-seq (location analysis), inducible expression system, RNAi high-throughput screen, reporter assay\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-seq plus expression profiling plus functional RNAi screen with multiple validated targets in a single study\",\n      \"pmids\": [\"23288701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TUG (ASPSCR1) C-terminus is acetylated; acetylation reduces binding of TUG to ACBD3 (but not Golgin-160), and mutation of acetylated residues impairs insulin-responsive GLUT4 trafficking. SIRT2 deacetylase binds TUG, deacetylates it, and its overexpression redistributes GLUT4 and IRAP to the plasma membrane. SIRT2 knockout mice show increased TUG acetylation and proteolytic processing and enhanced glucose disposal.\",\n      \"method\": \"Mass spectrometry/acetylation detection, co-immunoprecipitation, site-directed mutagenesis, RNAi, SIRT2 knockout mouse, glucose tolerance test\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — PTM identification, writer/eraser identified (SIRT2), mutagenesis, and in vivo mouse validation in one study\",\n      \"pmids\": [\"25561724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TUG proteolysis controls IRAP (insulin-regulated aminopeptidase) targeting to T-tubules in muscle as well as GLUT4 translocation; IRAP binds TUG through a short peptide previously shown critical for GLUT4 intracellular retention. Constitutive TUG proteolysis in transgenic mice increases vasopressin degradation in vivo, demonstrating that TUG controls coordinated translocation of both GLUT4 and IRAP vesicle cargoes.\",\n      \"method\": \"Transgenic mouse model, recombinant protein binding/mapping, co-immunoprecipitation, cell fractionation, vasopressin/copeptin assay, renal AQP2 measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse model with multiple physiological and biochemical readouts, direct binding mapping\",\n      \"pmids\": [\"25944897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ASPSCR1 (ASPL) contains an extended UBX domain (eUBX) that is critical for disassembly of p97 hexamers, generating stable p97:ASPL heterotetramers. Hexamer disassembly is accompanied by reorientation of the p97 D2 ATPase domain and loss of D2 ATPase activity. Overproduction of ASPL disrupts p97 hexamer function in ERAD.\",\n      \"method\": \"Quantitative interaction mapping, high-resolution structural studies (X-ray crystallography), biochemical disassembly assays, ATPase activity assay, ERAD functional assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus biochemical reconstitution plus mutagenesis (eUBX domain) plus functional cellular assay in one study\",\n      \"pmids\": [\"27762274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ASPL-TFE3 fusion oncoprotein functions as an aberrant transcription factor that directly activates p21 (CDKN1A) expression in a p53-independent manner through binding to the p21 promoter, causing cell cycle arrest and cellular senescence; senescent cells secrete proinflammatory SASP cytokines.\",\n      \"method\": \"Ectopic expression, luciferase reporter assay, RT-PCR, senescence-associated β-galactosidase staining, RNAi (p21 knockdown), tetracycline-inducible expression in mesenchymal stem cells\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus RNAi rescue plus inducible expression; single lab, multiple methods\",\n      \"pmids\": [\"27673450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Mutant p97 (disease-causing R93C, R155H, R155C) reduces the efficiency of UBXD9/TUG (ASPSCR1)/ASPL-mediated p97 hexamer disassembly into monomers, with species- and mutation-specific differences in binding affinity (assessed by surface plasmon resonance) and ATP-dependent interactions.\",\n      \"method\": \"Co-immunoprecipitation, pull-down assay, surface plasmon resonance, sucrose density gradient ultracentrifugation, ATPase activity measurement\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SPR quantitative binding plus functional disassembly assays; single lab\",\n      \"pmids\": [\"27132113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The muscle splice form of Usp25 (Usp25m), but not the Usp25a isoform, is the protease required for insulin-stimulated TUG cleavage and GLUT4 translocation in adipocytes. Usp25m binds TUG and GLUT4, colocalizes with TUG in unstimulated cells, and dissociates from TUG-bound vesicles after insulin. TUG cleavage generates TUGUL, which modifies the KIF5B kinesin motor, and this is required to load GLUT4 onto microtubule-based motors. TUG proteolysis and Usp25m are reduced in insulin-resistant adipose tissue.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, transfection reconstitution (isoform specificity), in vitro proteolysis assay, immunofluorescence/colocalization, diet-induced insulin resistance mouse model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — protease identified by reconstitution (isoform-specific), substrate modification (KIF5B by TUGUL) identified, in vivo disease-model validation; multiple orthogonal methods\",\n      \"pmids\": [\"29773651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Insulin-stimulated TUG (Aspscr1) cleavage in muscle releases a C-terminal cleavage product that enters the nucleus, binds PPARγ and PGC-1α, and regulates gene expression to promote lipid oxidation and thermogenesis, upregulating sarcolipin in muscle and UCP1 in adipocytes. This pathway is independent of PI3K/Akt. The PPARγ2 Pro12Ala polymorphism (associated with reduced diabetes risk) enhances TUG binding. The ATE1 arginyltransferase regulates stability of the TUG C-terminal product via an N-degron pathway. Muscle-specific Tug knockout and constitutive-cleavage mouse models confirmed regulation of insulin-stimulated glucose uptake and whole-body energy expenditure.\",\n      \"method\": \"Muscle-specific Aspscr1 knockout mice, muscle-specific constitutive TUG cleavage mice, nuclear co-immunoprecipitation (PPARγ/PGC-1α binding), gene expression analysis, indirect calorimetry, ATE1 knockout, glucose/insulin tolerance tests\",\n      \"journal\": \"Nature metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two complementary genetic mouse models, binding partners identified, PTM writer identified (ATE1), multiple orthogonal methods in one study\",\n      \"pmids\": [\"33686286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TUG (Aspscr1, UBXD9) proteins act as central tethers that trap GLUT4 storage vesicles at the Golgi matrix via N-terminal GLUT4-binding and C-terminal Golgi matrix-binding; insulin triggers Usp25m-mediated endoproteolytic cleavage generating the TUGUL ubiquitin-like modifier (N-terminal product) that modifies KIF5B kinesin in adipocytes, enabling microtubule-based vesicle transport to the cell surface. After cleavage, the TUG C-terminal product is extracted from the Golgi matrix by p97/VCP ATPase. In both muscle and fat, the C-terminal product enters the nucleus to bind PPARγ/PGC-1α and regulate fatty acid oxidation. Stability of the C-terminal product is regulated by Ate1-dependent N-degron pathway.\",\n      \"method\": \"Review integrating genetic mouse models, biochemical reconstitution, co-immunoprecipitation, and functional assays from multiple prior studies\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic synthesis review citing primary experimental data; confidence is Medium because this paper itself is a review, not new primary data\",\n      \"pmids\": [\"36246906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The N-terminal region of TUG (ASPSCR1; residues 10–83) adopts a ubiquitin-like (beta-grasp) fold as determined by NMR spectroscopy. This UBL1 domain lacks the C-terminal diglycine motif and canonical ubiquitin 'Ile-44 hydrophobic face', suggesting it functions as a protein-protein interaction module rather than as a covalent modifier.\",\n      \"method\": \"NMR spectroscopy (solution structure and backbone dynamics)\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — NMR structure of isolated domain, single study, no functional mutagenesis validation in the same paper\",\n      \"pmids\": [\"16501224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASPSCR1::TFE3 fusion transcription factor is dispensable for in vitro tumor cell maintenance but is required for in vivo tumor development via angiogenesis. ASPSCR1::TFE3 associates with super-enhancers (SEs) at its DNA binding sites; its loss causes SE redistribution affecting angiogenesis pathway genes. ASPSCR1::TFE3 transcriptionally activates Pdgfb, Rab27a, Sytl2, and Vwf; Rab27a and Sytl2 promote angiogenic factor trafficking to facilitate ASPS vascular network construction.\",\n      \"method\": \"Conditional knockdown (in vitro vs. in vivo comparison), CUT&RUN/ChIP-seq (SE mapping), epigenomic CRISPR/dCas9 functional screen, gene expression analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic loss-of-function, genome-wide epigenomic mapping, and CRISPR functional screen with mechanistic validation; multiple orthogonal methods\",\n      \"pmids\": [\"37029109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ASPL-TFE3 fusion protein translocates to the nucleus in renal cell carcinoma cells and transcriptionally activates lysosome-autophagy pathway genes by binding their promoters. This autophagy activation enables energy stress evasion by promoting protein and lipid utilization. The fusion protein escapes regulation by the classic mTOR-TFE3 signaling axis and instead activates phospho-mTOR and its downstream targets.\",\n      \"method\": \"Nuclear localization assay, ChIP/promoter binding assay, autophagy flux assay, mTOR pathway inhibition, in vitro and in vivo proliferation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter binding plus functional pathway assays; single lab, multiple methods\",\n      \"pmids\": [\"33846569\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ASPSCR1 (TUG/ASPL/UBXD9) is a multifunctional tethering protein that, in fat and muscle cells, traps GLUT4 storage vesicles at the Golgi matrix by binding GLUT4/IRAP cargoes via its N-terminus and Golgi matrix proteins (Golgin-160, ACBD3) via its acetylated C-terminus; insulin activates the Usp25m protease to cleave TUG, releasing the vesicles—with the N-terminal TUGUL product modifying KIF5B kinesin to drive microtubule-based vesicle transport to the plasma membrane, and the C-terminal product entering the nucleus to bind PPARγ/PGC-1α and promote fatty acid oxidation and thermogenesis via an ATE1-regulated N-degron pathway. Separately, TUG contains an extended UBX domain that binds the p97/VCP AAA-ATPase N-terminal domain and stoichiometrically disassembles p97 hexamers at ERGIC/ER exit sites, regulating membrane trafficking and Golgi reassembly. In alveolar soft part sarcoma, chromosomal translocation fuses ASPSCR1 to TFE3, producing an aberrant nuclear transcription factor that drives angiogenesis through super-enhancer remodeling, activates lysosomal/autophagy gene programs, and directly upregulates targets including p21, MET, CYP17A1, Rab27a, and Sytl2.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ASPSCR1 (TUG/ASPL/UBXD9) is a multifunctional tethering protein that controls insulin-regulated vesicle trafficking and that, when fused to TFE3, becomes a sarcoma-driving oncogenic transcription factor [#1, #13, #15]. In fat and muscle, intact TUG traps GLUT4 storage vesicles intracellularly by binding GLUT4 through its N-terminal region and the Golgi matrix through its acetylated C-terminus, holding vesicles in perinuclear membranes until insulin acts [#1, #3, #13]; its N-terminus adopts a ubiquitin-like beta-grasp fold that serves as a protein-interaction module rather than a covalent modifier [#14]. Insulin triggers site-specific endoproteolytic cleavage of TUG by the muscle splice form of the Usp25 protease in a TC10\\u03b1-dependent manner, releasing vesicles for translocation; the N-terminal TUGUL product modifies the KIF5B kinesin to load cargo onto microtubule motors, while the C-terminal product enters the nucleus to bind PPAR\\u03b3/PGC-1\\u03b1 and drive fatty acid oxidation and thermogenesis, with its stability controlled by the ATE1 N-degron pathway [#3, #11, #12]. This proteolytic switch governs coordinated translocation of both GLUT4 and IRAP and regulates systemic glucose homeostasis and energy expenditure in vivo [#4, #7]. Independently, TUG binds the p97/VCP AAA-ATPase N-terminal domain through an extended UBX domain and stoichiometrically disassembles p97 hexamers into p97:ASPL heterotetramers with loss of D2 ATPase activity, regulating ERAD, membrane trafficking, and Golgi reassembly [#2, #8]. In alveolar soft part sarcoma, the der(17)t(X;17) translocation fuses ASPSCR1 in-frame to TFE3, producing a nuclear oncoprotein that acts as a strong transactivator binding thousands of genomic loci and directly upregulating MET, CYP17A1, and other targets [#0, #5]; in vivo it remodels super-enhancers to drive angiogenesis via Pdgfb, Rab27a, and Sytl2, activates lysosome-autophagy programs, and induces p21-dependent senescence with SASP secretion [#15, #16, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that ASPSCR1 is recurrently disrupted by chromosomal translocation, defining its oncogenic relevance and revealing a C-terminal UBX-like domain.\",\n      \"evidence\": \"RT-PCR, cDNA sequencing, and FISH across alveolar soft part sarcoma cases\",\n      \"pmids\": [\"11244503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how the fusion deregulates transcription\", \"Did not characterize the normal function of the UBX-like domain\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Determined that the N-terminal TUG region folds as a ubiquitin-like domain lacking the diglycine motif, indicating a protein-interaction rather than conjugation role.\",\n      \"evidence\": \"NMR solution structure of the isolated UBL1 domain\",\n      \"pmids\": [\"16501224\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional mutagenesis in the same study\", \"Binding partners of the UBL1 domain not identified structurally\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified TUG's physiological role: it directly binds GLUT4 and sequesters it intracellularly, making it a gatekeeper of insulin-responsive glucose uptake.\",\n      \"evidence\": \"siRNA knockdown, dominant-negative fragment, microscopy, binding and glucose-uptake assays in 3T3-L1 adipocytes\",\n      \"pmids\": [\"17202135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of insulin-triggered release not defined\", \"Did not identify the C-terminal anchoring partner\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed a trafficking-regulatory function distinct from GLUT4: TUG binds the p97/VCP N-domain and disassembles p97 hexamers at the ERGIC/ER exit sites.\",\n      \"evidence\": \"Co-IP, in vitro disassembly assays, domain mapping, and brefeldin A washout in cells\",\n      \"pmids\": [\"22207755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of hexamer disassembly not resolved\", \"Relationship between p97 binding and GLUT4 tethering unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the molecular switch: insulin drives site-specific TUG cleavage that severs the GLUT4-binding from the Golgi-anchoring half, releasing vesicles.\",\n      \"evidence\": \"Cleavage-resistant mutant rescue, TC10\\u03b1 RNAi epistasis, Co-IP, and glucose-uptake assays\",\n      \"pmids\": [\"22610098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The protease responsible was not identified\", \"Fate of the cleavage products not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed the TUG proteolytic pathway controls systemic physiology, linking cleavage to glucose turnover and whole-body energy expenditure in muscle.\",\n      \"evidence\": \"Muscle-specific UBX-Cter transgenic mice, hyperinsulinemic clamp, and indirect calorimetry\",\n      \"pmids\": [\"23744065\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the nuclear effectors of energy expenditure\", \"Mechanism connecting cleavage to thermogenesis unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that the ASPSCR1-TFE3 fusion is a nuclear transactivator with genome-wide binding and proliferation-promoting targets, providing the transcriptional mechanism implied in 2001.\",\n      \"evidence\": \"Nuclear localization, genome-wide ChIP-seq, inducible expression, and an RNAi target screen\",\n      \"pmids\": [\"23288701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address in vivo tumor requirement\", \"Chromatin/enhancer mechanism not yet defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established post-translational control of TUG by acetylation, with SIRT2 deacetylation tuning GLUT4/IRAP trafficking and proteolysis.\",\n      \"evidence\": \"Acetylation MS, Co-IP, mutagenesis, RNAi, and SIRT2 knockout mice with glucose tolerance tests\",\n      \"pmids\": [\"25561724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetyltransferase (writer) not identified\", \"How acetylation influences cleavage kinetics unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended TUG's cargo control beyond GLUT4 to IRAP, showing coordinated regulation of multiple vesicle cargoes with measurable physiological consequences.\",\n      \"evidence\": \"Transgenic mice, recombinant binding mapping, Co-IP, and in vivo vasopressin/copeptin assays\",\n      \"pmids\": [\"25944897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full cargo repertoire not enumerated\", \"Tissue specificity of cargo selection unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided the structural mechanism of p97 regulation: an extended UBX domain converts hexamers into stable heterotetramers, reorienting D2 and abolishing its ATPase activity.\",\n      \"evidence\": \"X-ray crystallography, quantitative interaction mapping, ATPase and ERAD assays\",\n      \"pmids\": [\"27762274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological trigger for disassembly in cells not defined\", \"Reversal of disassembly not characterized\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected ASPSCR1-mediated p97 disassembly to disease, showing pathogenic p97 mutations reduce disassembly efficiency.\",\n      \"evidence\": \"Co-IP, pull-down, surface plasmon resonance, and density-gradient disassembly assays\",\n      \"pmids\": [\"27132113\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab without orthogonal cellular validation\", \"Disease relevance of altered disassembly not demonstrated in vivo\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed the ASPL-TFE3 fusion drives p53-independent p21 activation, cell-cycle arrest, and senescence with SASP secretion, adding a growth-modulatory facet to the oncoprotein.\",\n      \"evidence\": \"Reporter assay, RT-PCR, SA-\\u03b2-gal staining, p21 RNAi rescue, and inducible expression in MSCs\",\n      \"pmids\": [\"27673450\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab evidence\", \"Reconciliation of senescence with tumor proliferation unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified the protease and the downstream effector of TUG cleavage: muscle Usp25m generates TUGUL, which modifies KIF5B to load GLUT4 onto microtubule motors, and is reduced in insulin resistance.\",\n      \"evidence\": \"Isoform-specific reconstitution, Co-IP, in vitro proteolysis, colocalization, and diet-induced insulin resistance mice\",\n      \"pmids\": [\"29773651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of TUGUL attachment to KIF5B not structurally defined\", \"Regulation of Usp25m isoform expression unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined the nuclear function of the C-terminal cleavage product, linking TUG proteolysis to PPAR\\u03b3/PGC-1\\u03b1-driven lipid oxidation/thermogenesis and to ATE1 N-degron-controlled stability.\",\n      \"evidence\": \"Muscle-specific knockout and constitutive-cleavage mice, nuclear Co-IP, calorimetry, and ATE1 knockout\",\n      \"pmids\": [\"33686286\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets of the nuclear product not enumerated\", \"Mechanism coupling cleavage to nuclear entry unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed the ASPL-TFE3 fusion in renal cell carcinoma activates lysosome-autophagy genes and bypasses mTOR-TFE3 regulation to enable energy-stress evasion.\",\n      \"evidence\": \"Nuclear localization, promoter binding, autophagy flux, mTOR inhibition, and proliferation assays\",\n      \"pmids\": [\"33846569\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab evidence\", \"Mechanism of escape from mTOR regulation not fully defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established that ASPSCR1::TFE3 is dispensable in vitro but required for in vivo tumor angiogenesis through super-enhancer remodeling and activation of vesicle-trafficking genes.\",\n      \"evidence\": \"Conditional in vivo knockdown, CUT&RUN/ChIP-seq super-enhancer mapping, and dCas9 epigenomic CRISPR screen\",\n      \"pmids\": [\"37029109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism of super-enhancer recruitment unresolved\", \"Whether normal ASPSCR1 functions contribute to fusion activity unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the normal trafficking/p97-regulatory functions of ASPSCR1 relate to the oncogenic activity of the ASPSCR1-TFE3 fusion, and whether retained ASPSCR1 domains shape fusion behavior, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No study connects TUG's tethering/p97 biology to fusion oncogenesis\", \"Contribution of the UBX/UBL domains to the fusion protein not tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 3, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 5, 15]},\n      {\"term_id\": \"GO:0031386\", \"supporting_discovery_ids\": [11, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005795\", \"supporting_discovery_ids\": [3, 13]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 12, 16]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [1, 3, 7]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 11, 13]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 12, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 15, 16]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 8]}\n    ],\n    \"complexes\": [\n      \"p97/VCP:ASPL heterotetramer\",\n      \"GLUT4 storage vesicle tethering complex\",\n      \"ASPSCR1-TFE3 fusion transcription factor\"\n    ],\n    \"partners\": [\n      \"GLUT4\",\n      \"VCP\",\n      \"Golgin-160\",\n      \"ACBD3\",\n      \"USP25\",\n      \"KIF5B\",\n      \"SIRT2\",\n      \"PPARG\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}