{"gene":"ASPSCR1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2001,"finding":"ASPSCR1 (ASPL) is fused to TFE3 transcription factor gene via the der(17)t(X;17)(p11.2;q25) translocation in alveolar soft part sarcoma, creating an ASPL-TFE3 fusion protein that retains the TFE3 DNA-binding domain while replacing its N-terminal portion with ASPL sequences, implicating transcriptional deregulation in ASPS pathogenesis. ASPSCR1 contains a UBX-like domain in its carboxy-terminal portion.","method":"RT-PCR, Southern blotting, FISH, cDNA cloning and sequencing","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 — original discovery with multiple orthogonal methods (FISH, Southern blot, RT-PCR, sequence analysis) replicated across multiple ASPS cases","pmids":["11244503"],"is_preprint":false},{"year":2001,"finding":"ASPSCR1-TFE3 fusion-positive renal tumors bear the identical ASPL-TFE3 fusion transcript as ASPS but with a balanced t(X;17) translocation, distinguishing them from ASPS where the translocation is unbalanced.","method":"RT-PCR for fusion transcript, FISH for translocation balance","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (RT-PCR, FISH, electron microscopy, immunohistochemistry) on 8 tumor cases","pmids":["11438465"],"is_preprint":false},{"year":2007,"finding":"TUG (ASPSCR1) retains GLUT4 within intracellular perinuclear membranes distinct from endosomes in unstimulated 3T3-L1 adipocytes; siRNA-mediated TUG depletion or dominant negative fragment expression causes GLUT4 translocation and enhanced glucose uptake. TUG binds directly and specifically to a large intracellular loop in GLUT4.","method":"siRNA knockdown, dominant negative expression, glucose uptake assays, microscopy, direct binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including direct binding assay, RNAi, dominant negative, and functional glucose uptake readout in a single study","pmids":["17202135"],"is_preprint":false},{"year":2011,"finding":"TUG (ASPSCR1) localizes to the endoplasmic reticulum-to-Golgi intermediate compartment and ER exit sites in HeLa cells. TUG binds p97/VCP ATPase through an extended sequence comprising three regions (not solely the UBX domain) that contacts the p97 N-terminal domain, and causes stoichiometric disassembly of p97 hexamers into monomers. TUG is required for efficient reassembly of the Golgi complex after brefeldin A removal.","method":"Co-immunoprecipitation, domain mapping, in vitro hexamer disassembly assay, siRNA knockdown, immunofluorescence localization, brefeldin A washout assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — reconstitution of p97 hexamer disassembly in vitro, domain mapping, and functional cellular assay in one study","pmids":["22207755"],"is_preprint":false},{"year":2012,"finding":"TUG (ASPSCR1) undergoes site-specific endoproteolytic cleavage in response to insulin in 3T3-L1 adipocytes, separating the GLUT4-binding N-terminal region (generating an 18-kDa ubiquitin-like modifier called TUGUL) from the C-terminal region that anchors vesicles at the Golgi matrix via PIST and Golgin-160. Intact TUG links GLUT4 to PIST (an effector of TC10α GTPase), and TC10α is required for TUG proteolytic processing. A cleavage-resistant TUG mutant does not support highly insulin-responsive GLUT4 translocation.","method":"Biochemical fractionation, immunoblotting for cleavage products, RNAi (TC10α), mutagenesis (cleavage-resistant TUG), co-immunoprecipitation, glucose uptake assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis combined with functional assays and pathway epistasis (TC10α RNAi), multiple orthogonal methods","pmids":["22610098"],"is_preprint":false},{"year":2013,"finding":"ASPSCR1-TFE3 fusion oncoprotein has predominantly nuclear localization and functions as a stronger transcriptional transactivator than native TFE3. Genome-wide location analysis identified 2193 genes bound by ASPSCR1-TFE3, with 332 putative up-regulated direct targets including MET, CYP17A1, and UPP1. RNAi screens identified 12 target genes (including MET) that contribute to ASPSCR1-TFE3-positive cancer cell proliferation.","method":"Nuclear localization confirmed by microscopy, genome-wide ChIP-seq (location analysis), inducible expression system, RNAi functional screen, luciferase reporter assays","journal":"The Journal of pathology","confidence":"High","confidence_rationale":"Tier 1-2 — genome-wide ChIP-seq, functional RNAi screen, and multiple validation methods in one integrated study","pmids":["23288701"],"is_preprint":false},{"year":2013,"finding":"TUG (ASPSCR1) proteolytic processing in skeletal muscle controls GLUT4 translocation to T-tubule fractions and impacts systemic glucose homeostasis and energy expenditure. In muscle-specific transgenic mice expressing a truncated TUG fragment (UBX-Cter), TUG proteolysis becomes constitutive, GLUT4 is translocated during fasting, fasting plasma glucose and insulin are reduced, and whole-body VO2, VCO2, and energy expenditure are increased ~12-13%.","method":"Muscle-specific transgenic mouse model, 2-deoxyglucose uptake, hyperinsulinemic clamp, subcellular fractionation, metabolic cage measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — clean transgenic mouse model with multiple in vivo metabolic readouts and direct GLUT4 localization measurement","pmids":["23744065"],"is_preprint":false},{"year":2015,"finding":"The TUG (ASPSCR1) C-terminus is acetylated; acetylation modulates its interaction with the Golgi matrix protein ACBD3, reducing TUG-ACBD3 binding while not affecting Golgin-160 binding. SIRT2 deacetylase binds TUG and deacetylates it; SIRT2 overexpression reduces TUG acetylation and redistributes GLUT4 to the plasma membrane. TUG also controls vesicle translocation by interacting with IRAP as well as GLUT4, coordinating IRAP targeting and vasopressin inactivation in vivo.","method":"Acetylation site identification, Co-IP, overexpression/knockdown of SIRT2, SIRT2 knockout mice, glucose tolerance tests, subcellular fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — post-translational modification identified with writer/eraser, functional mutagenesis, and in vivo knockout validation","pmids":["25561724"],"is_preprint":false},{"year":2015,"finding":"TUG (ASPSCR1) proteolysis controls IRAP targeting to T-tubules in skeletal muscle and regulates vasopressin inactivation in vivo. Recombinant IRAP binds to TUG, mapped to a short peptide in IRAP previously shown to be critical for GLUT4 intracellular retention. In 3T3-L1 adipocytes, IRAP is present in TUG-bound membranes and released by insulin stimulation.","method":"Transgenic mouse model with constitutive TUG proteolysis, subcellular fractionation, recombinant protein binding/mapping, in vivo vasopressin/copeptin measurements, renal AQP2 analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — direct binding mapped to specific peptide, functional in vivo consequence demonstrated in transgenic mice","pmids":["25944897"],"is_preprint":false},{"year":2016,"finding":"ASPSCR1 (ASPL) contains an extended UBX domain (eUBX) that is critical for p97 hexamer disassembly. ASPL efficiently promotes p97 hexamer disassembly, forming stable p97:ASPL heterotetramers. This is accompanied by reorientation of the p97 D2 ATPase domain and loss of its ATPase activity. Overproduction of ASPL disrupts p97 hexamer function in ERAD.","method":"Quantitative interaction mapping, high-resolution structural studies (crystal structure), in vitro hexamer disassembly biochemical assay, domain mutagenesis, ERAD functional assay, cell death assays with engineered eUBX polypeptides","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — crystal structure combined with reconstituted in vitro biochemical assay and mutagenesis, with cellular functional validation","pmids":["27762274"],"is_preprint":false},{"year":2016,"finding":"ASPL-TFE3 oncoprotein directly transactivates p21 (p21WAF1/CIP1) promoter in a p53-independent manner, causing cell cycle arrest and cellular senescence in human bone marrow-derived mesenchymal stem cells. ASPL-TFE3-induced senescence involves upregulation of SASP-associated proinflammatory cytokines.","method":"Ectopic expression, reporter assay (p21 promoter), p21 siRNA rescue, senescence-associated β-galactosidase assay, tetracycline-inducible expression in MSCs","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter binding assay and siRNA rescue in relevant cell type, single lab","pmids":["27673450"],"is_preprint":false},{"year":2018,"finding":"Usp25m (muscle splice form of Usp25) is the protease required for insulin-stimulated TUG (ASPSCR1) 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 addition. TUG proteolysis generates TUGUL, which modifies the KIF5B kinesin motor; TUG proteolysis is required to load GLUT4 onto KIF5B motors. In diet-induced insulin resistance, TUG proteolysis and Usp25m abundance are reduced in adipose tissue.","method":"Protein interaction (co-IP, pulldown), reconstitution of TUG cleavage in nonadipocytes by transfection, colocalization microscopy, kinesin modification assay, diet-induced insulin resistance model in rodents","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — identification of the specific protease with reconstitution in nonadipocytes, multiple orthogonal methods, in vivo validation","pmids":["29773651"],"is_preprint":false},{"year":2006,"finding":"The N-terminal ubiquitin-like domain (UBL1, residues 10-83) of TUG (ASPSCR1) adopts a beta-grasp/ubiquitin-like topology as determined by NMR spectroscopy. This domain is not required for in vitro association with GLUT4 and lacks the C-terminal diglycine motif required for conjugation and the Ile-44 hydrophobic face for ubiquitin recognition.","method":"NMR spectroscopy (structure determination), backbone dynamics analysis, in vitro binding assay","journal":"Protein science","confidence":"Medium","confidence_rationale":"Tier 1 — NMR structure determination, but functional role of this specific domain not fully resolved","pmids":["16501224"],"is_preprint":false},{"year":2021,"finding":"TUG (ASPSCR1) proteolysis by Usp25m generates TUGUL (N-terminal product) that modifies KIF5B kinesin in adipocytes, and generates a C-terminal cleavage product that enters the nucleus, binds PPARγ and PGC-1α, and regulates gene expression to promote fatty acid oxidation and thermogenesis by upregulating sarcolipin and UCP1. The ATE1 arginyltransferase regulates stability of the TUG C-terminal product via an N-degron pathway. The PPARγ2 Pro12Ala polymorphism (which reduces diabetes risk) enhances TUG binding to PPARγ.","method":"Muscle-specific Tug (Aspscr1) knockout mice, muscle-specific constitutive TUG cleavage mice, nuclear fractionation, Co-IP with PPARγ/PGC-1α, gene expression analysis, metabolic phenotyping","journal":"Nature metabolism","confidence":"High","confidence_rationale":"Tier 2 — clean muscle-specific KO and constitutive cleavage mouse models with multiple orthogonal mechanistic readouts","pmids":["33686286"],"is_preprint":false},{"year":2021,"finding":"ASPL-TFE3 fusion protein translocates into the nucleus and transcriptionally activates the lysosome-autophagy pathway by binding to promoters of lysosome-related genes, enabling RCC cells to escape energy stress. ASPL-TFE3 escapes regulation by the classic mTOR-TFE3 signal and instead activates phospho-mTOR and its downstream targets.","method":"Promoter binding assays (ChIP), in vitro and in vivo proliferation assays, autophagy flux measurement, pathway inhibition studies","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP for promoter binding with functional validation in vitro and in vivo, single lab","pmids":["33846569"],"is_preprint":false},{"year":2022,"finding":"TUG (ASPSCR1) ubiquitin-like processing is the central mechanism retaining GLUT4 storage vesicles at the Golgi matrix; intact TUG binds vesicle cargoes (GLUT4, IRAP) with its N-terminus and Golgi matrix proteins (Golgin-160, ACBD3) with its C-terminus. In adipocytes, TUGUL modifies KIF5B to transport vesicles; the C-terminal product is extracted from the Golgi matrix by p97 (VCP) ATPase after TUG cleavage.","method":"Review integrating prior biochemical, genetic, and structural data; p97 extraction role supported by prior biochemical studies","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 3 — review article synthesizing prior experimental work; p97 extraction model cited from prior mechanistic studies","pmids":["36246906"],"is_preprint":false},{"year":2016,"finding":"Mutant p97 proteins show reduced binding to human TUG/ASPL/UBXD9 compared to wild-type p97, and both human and Dictyostelium UBXD9 (TUG/ASPL) very efficiently disassemble wild-type p97 hexamers into monomers but are less effective on mutant p97. Binding affinity differences are species-, mutation-, and ATP-dependent.","method":"Pull-down assays, surface plasmon resonance, sucrose density gradient ultracentrifugation, co-immunoprecipitation","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding quantified by SPR with functional hexamer disassembly assay, replicates and extends prior findings","pmids":["27132113"],"is_preprint":false},{"year":2023,"finding":"ASPSCR1::TFE3 fusion transcription factor is dispensable for in vitro tumor maintenance but required for in vivo ASPS tumor development via angiogenesis. ASPSCR1::TFE3 associates with super-enhancers at its binding sites; its loss induces super-enhancer redistribution affecting angiogenesis pathway genes. Key angiogenic targets identified by epigenomic CRISPR/dCas9 screening include Pdgfb, Rab27a, Sytl2, and Vwf; Rab27a and Sytl2 upregulation promotes angiogenic factor-trafficking for vascular network construction.","method":"In vitro vs. in vivo tumor growth comparison, ChIP-seq for super-enhancers, epigenomic CRISPR/dCas9 screen, functional validation of specific target genes","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo genetic requirement demonstrated with CRISPR, genome-wide epigenomic analysis and functional target validation","pmids":["37029109"],"is_preprint":false}],"current_model":"ASPSCR1 (TUG/ASPL/UBXD9) functions in two distinct mechanistic contexts: (1) as a tethering protein in fat and muscle cells that sequesters 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 C-terminus — insulin activates Usp25m to cleave TUG, releasing TUGUL (which modifies KIF5B kinesin for vesicle transport) and a C-terminal product (extracted by p97 ATPase) that enters the nucleus to bind PPARγ/PGC-1α and promote lipid oxidation and thermogenesis; and (2) when fused to TFE3 via the ASPS-specific der(17)t(X;17)(p11.2;q25) translocation, the ASPSCR1-TFE3 fusion oncoprotein localizes to the nucleus and acts as an aberrant, potently activating transcription factor driving expression of angiogenesis, autophagy-lysosomal, and cell cycle target genes to promote alveolar soft part sarcoma and Xp11 translocation renal cell carcinoma."},"narrative":{"teleology":[{"year":2001,"claim":"Identification of the ASPSCR1-TFE3 fusion as the product of the ASPS-defining translocation established ASPSCR1 as a gene whose disruption drives sarcoma and renal carcinoma through creation of an aberrant transcription factor.","evidence":"RT-PCR, FISH, Southern blot, and sequencing across multiple ASPS and renal tumor cases","pmids":["11244503","11438465"],"confidence":"High","gaps":["Normal function of ASPSCR1 protein was unknown","Mechanism by which the fusion activates transcription was not defined","Whether fusion requires both gene products or acts dominantly was unclear"]},{"year":2006,"claim":"Structural determination of the ASPSCR1 N-terminal domain revealed a ubiquitin-like (UBL) fold, providing the first indication that ASPSCR1 might participate in ubiquitin-like modification or recognition pathways despite lacking classical conjugation motifs.","evidence":"NMR spectroscopy solution structure with in vitro binding assays","pmids":["16501224"],"confidence":"Medium","gaps":["Functional role of the UBL domain in cells was not established","Physiological binding partners of this domain were not identified"]},{"year":2007,"claim":"Discovery that ASPSCR1/TUG retains GLUT4 in intracellular compartments and that its depletion phenocopies insulin-stimulated GLUT4 translocation established the protein's core physiological function as a GLUT4 storage vesicle tether.","evidence":"siRNA knockdown, dominant-negative expression, glucose uptake assays, and direct GLUT4 binding in 3T3-L1 adipocytes","pmids":["17202135"],"confidence":"High","gaps":["How insulin signals to release TUG-tethered vesicles was unknown","The identity of the intracellular anchor for TUG was not defined"]},{"year":2011,"claim":"Demonstration that ASPSCR1 binds p97/VCP and disassembles its hexamers linked ASPSCR1 to p97-dependent membrane trafficking and established a unique biochemical activity among UBX-domain cofactors.","evidence":"In vitro hexamer disassembly reconstitution, domain mapping, siRNA knockdown affecting Golgi reassembly in HeLa cells","pmids":["22207755"],"confidence":"High","gaps":["Structural basis of hexamer disassembly was not resolved","Whether p97 disassembly was relevant to GLUT4 trafficking was unknown"]},{"year":2012,"claim":"Identification of insulin-stimulated endoproteolytic cleavage of ASPSCR1 and its linkage to the Golgi matrix via PIST/Golgin-160 resolved how insulin mobilizes GLUT4 vesicles — by severing the tether rather than displacing it.","evidence":"Biochemical detection of cleavage products, TC10α epistasis by RNAi, cleavage-resistant mutant blocking insulin-responsive translocation in 3T3-L1 adipocytes","pmids":["22610098"],"confidence":"High","gaps":["Identity of the protease was unknown","Fate and function of cleavage products were not characterized"]},{"year":2013,"claim":"Genome-wide identification of ASPSCR1-TFE3 transcriptional targets (including MET) and demonstration of its enhanced transactivation relative to wild-type TFE3 defined the oncogenic mechanism as constitutive, amplified transcriptional activation at hundreds of loci.","evidence":"ChIP-seq, RNAi proliferation screen, and luciferase reporter assays in ASPS cell lines","pmids":["23288701"],"confidence":"High","gaps":["Epigenomic basis (enhancer remodeling) was not explored","Whether all identified targets contribute to tumorigenesis was untested"]},{"year":2013,"claim":"Transgenic mouse studies showed that constitutive ASPSCR1 proteolysis in muscle drives GLUT4 to T-tubules and increases whole-body energy expenditure, establishing systemic metabolic relevance beyond the adipocyte.","evidence":"Muscle-specific transgenic mouse with constitutive TUG cleavage, hyperinsulinemic clamp, metabolic cages","pmids":["23744065"],"confidence":"High","gaps":["Nuclear signaling consequences of TUG cleavage in muscle were not examined","Whether muscle TUG cleavage occurs physiologically under insulin stimulation was not directly shown"]},{"year":2015,"claim":"Discovery that ASPSCR1 also tethers IRAP-containing vesicles and that acetylation by SIRT2 modulates ASPSCR1-ACBD3 binding expanded the tethering model to include vasopressin metabolism and post-translational regulation of tether affinity.","evidence":"Acetylation site mapping, SIRT2 knockout mice, recombinant IRAP binding assays, in vivo vasopressin measurements","pmids":["25561724","25944897"],"confidence":"High","gaps":["Acetyltransferase writing ASPSCR1 acetylation was not identified","Quantitative contribution of acetylation vs. proteolysis to GLUT4 release was unclear"]},{"year":2016,"claim":"Crystallographic and biochemical analysis revealed that ASPSCR1's extended UBX domain drives p97 hexamer disassembly into stable heterotetramers with reoriented D2 domains, providing a structural mechanism for how overproduction disrupts ERAD.","evidence":"Crystal structure of p97-ASPL complex, quantitative disassembly and ATPase assays, ERAD reporter assay","pmids":["27762274","27132113"],"confidence":"High","gaps":["Physiological contexts requiring p97 disassembly by ASPSCR1 were not defined","Whether p97 disassembly occurs during GLUT4 vesicle release was not tested"]},{"year":2018,"claim":"Identification of Usp25m as the insulin-activated protease that cleaves ASPSCR1, generating TUGUL that modifies KIF5B kinesin, completed the enzymatic mechanism of GLUT4 vesicle release and linked diet-induced insulin resistance to reduced ASPSCR1 processing.","evidence":"Reconstitution of TUG cleavage by Usp25m transfection in non-adipocytes, co-IP, KIF5B modification assay, diet-induced obesity model","pmids":["29773651"],"confidence":"High","gaps":["How insulin activates Usp25m catalytic activity was not resolved","Whether Usp25m cleaves other substrates in this pathway was unknown"]},{"year":2021,"claim":"Mouse genetic studies demonstrated that the ASPSCR1 C-terminal cleavage product enters the nucleus, binds PPARγ/PGC-1α, and drives fatty acid oxidation and thermogenesis, revealing a second signaling arm of ASPSCR1 proteolysis beyond vesicle transport.","evidence":"Muscle-specific Aspscr1 knockout and constitutive-cleavage mice, nuclear fractionation, co-IP with PPARγ/PGC-1α, metabolic and gene expression phenotyping","pmids":["33686286"],"confidence":"High","gaps":["How p97 extracts the C-terminal product from the Golgi matrix for nuclear import was not mechanistically resolved","Whether the PPARγ Pro12Ala effect on TUG binding is sufficient to alter metabolic outcomes in humans was not tested"]},{"year":2021,"claim":"Demonstration that ASPSCR1-TFE3 escapes mTOR-mediated cytoplasmic sequestration and transcriptionally activates the autophagy-lysosome pathway explained how fusion-driven cancers evade energy stress.","evidence":"ChIP for lysosomal gene promoters, autophagy flux assays, mTOR pathway analysis in RCC cells","pmids":["33846569"],"confidence":"Medium","gaps":["Whether autophagy activation is required for tumor maintenance or initiation was not distinguished","Mechanism of mTOR escape was not structurally explained"]},{"year":2023,"claim":"Epigenomic profiling revealed that ASPSCR1-TFE3 remodels super-enhancers to drive angiogenesis in vivo, identifying Rab27a/Sytl2-mediated angiogenic factor trafficking as the critical downstream effector for ASPS tumor vascularization.","evidence":"ChIP-seq for super-enhancers, CRISPR knockout of fusion in ASPS model, epigenomic dCas9 screen, in vivo tumor growth","pmids":["37029109"],"confidence":"High","gaps":["Whether therapeutic targeting of angiogenic effectors can substitute for direct fusion inhibition was not tested","Super-enhancer dependencies in renal cell carcinoma driven by the same fusion were not examined"]},{"year":null,"claim":"Key unresolved questions include how insulin activates Usp25m catalytic activity, how p97 extracts the ASPSCR1 C-terminal product from the Golgi for nuclear import, and whether ASPSCR1's p97-disassembly activity is physiologically linked to its GLUT4-tethering function.","evidence":"","pmids":[],"confidence":"Low","gaps":["Insulin-to-Usp25m signaling cascade is undefined","p97 extraction mechanism during TUG cleavage not reconstituted","No structural model of intact TUG tethering complex exists"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,4,7,8,11,13]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,4,8,15]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[5,10,14,17]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3,4,7,15]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,11]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5,13,14]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[2,4,8]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[2,4,6,8,11,15]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[2,6,11]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[7,13]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,5,10,14,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,7,11]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,13,17]}],"complexes":["p97-ASPSCR1 heterotetramer","TUG-GLUT4/IRAP-Golgin-160/ACBD3 tethering complex"],"partners":["VCP","SLC2A4","LNPEP","GOLGB1","ACBD3","USP25","KIF5B","PPARG"],"other_free_text":[]},"mechanistic_narrative":"ASPSCR1 (also called TUG, ASPL, or UBXD9) functions as a bifunctional tethering and signaling protein that governs insulin-stimulated glucose transporter mobilization and, when proteolytically processed, coordinates both vesicle transport and nuclear transcriptional programs controlling energy metabolism. In unstimulated adipocytes and myocytes, intact ASPSCR1 retains GLUT4/IRAP-containing storage vesicles at the Golgi matrix by binding vesicle cargoes via its N-terminus and Golgi matrix proteins (Golgin-160, ACBD3) via its C-terminus; insulin triggers Usp25m-mediated endoproteolytic cleavage, releasing an N-terminal ubiquitin-like modifier (TUGUL) that modifies KIF5B kinesin for vesicle transport, while the C-terminal product is extracted by p97/VCP ATPase, enters the nucleus, and binds PPARγ/PGC-1α to promote fatty acid oxidation and thermogenesis [PMID:17202135, PMID:22610098, PMID:29773651, PMID:33686286]. ASPSCR1 also directly disassembles p97 hexamers into monomers through its extended UBX domain, forming stable p97:ASPSCR1 heterotetramers and modulating p97-dependent processes including ERAD and Golgi reassembly [PMID:22207755, PMID:27762274]. The recurrent t(X;17)(p11.2;q25) chromosomal translocation fuses ASPSCR1 to TFE3, producing an ASPSCR1-TFE3 fusion oncoprotein that acts as an aberrant, constitutively nuclear transcriptional activator driving alveolar soft part sarcoma and Xp11 translocation renal cell carcinoma through super-enhancer-mediated upregulation of angiogenesis, autophagy-lysosomal, and cell cycle target genes [PMID:11244503, PMID:23288701, PMID:37029109]."},"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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ASPSCR1 contains a UBX-like domain in its carboxy-terminal portion.\",\n      \"method\": \"RT-PCR, Southern blotting, FISH, cDNA cloning and sequencing\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — original discovery with multiple orthogonal methods (FISH, Southern blot, RT-PCR, sequence analysis) replicated across multiple ASPS cases\",\n      \"pmids\": [\"11244503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ASPSCR1-TFE3 fusion-positive renal tumors bear the identical ASPL-TFE3 fusion transcript as ASPS but with a balanced t(X;17) translocation, distinguishing them from ASPS where the translocation is unbalanced.\",\n      \"method\": \"RT-PCR for fusion transcript, FISH for translocation balance\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (RT-PCR, FISH, electron microscopy, immunohistochemistry) on 8 tumor cases\",\n      \"pmids\": [\"11438465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TUG (ASPSCR1) retains GLUT4 within intracellular perinuclear membranes distinct from endosomes in unstimulated 3T3-L1 adipocytes; siRNA-mediated TUG depletion or dominant negative fragment expression causes GLUT4 translocation and enhanced glucose uptake. TUG binds directly and specifically to a large intracellular loop in GLUT4.\",\n      \"method\": \"siRNA knockdown, dominant negative expression, glucose uptake assays, microscopy, direct binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including direct binding assay, RNAi, dominant negative, and functional glucose uptake readout in a single study\",\n      \"pmids\": [\"17202135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TUG (ASPSCR1) localizes to the endoplasmic reticulum-to-Golgi intermediate compartment and ER exit sites in HeLa cells. TUG binds p97/VCP ATPase through an extended sequence comprising three regions (not solely the UBX domain) that contacts the p97 N-terminal domain, and causes stoichiometric disassembly of p97 hexamers into monomers. TUG is required for efficient reassembly of the Golgi complex after brefeldin A removal.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, in vitro hexamer disassembly assay, siRNA knockdown, immunofluorescence localization, brefeldin A washout assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution of p97 hexamer disassembly in vitro, domain mapping, and functional cellular assay in one study\",\n      \"pmids\": [\"22207755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TUG (ASPSCR1) undergoes site-specific endoproteolytic cleavage in response to insulin in 3T3-L1 adipocytes, separating the GLUT4-binding N-terminal region (generating an 18-kDa ubiquitin-like modifier called TUGUL) from the C-terminal region that anchors vesicles at the Golgi matrix via PIST and Golgin-160. Intact TUG links GLUT4 to PIST (an effector of TC10α GTPase), and TC10α is required for TUG proteolytic processing. A cleavage-resistant TUG mutant does not support highly insulin-responsive GLUT4 translocation.\",\n      \"method\": \"Biochemical fractionation, immunoblotting for cleavage products, RNAi (TC10α), mutagenesis (cleavage-resistant TUG), co-immunoprecipitation, glucose uptake assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis combined with functional assays and pathway epistasis (TC10α RNAi), multiple orthogonal methods\",\n      \"pmids\": [\"22610098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ASPSCR1-TFE3 fusion oncoprotein has predominantly nuclear localization and functions as a stronger transcriptional transactivator than native TFE3. Genome-wide location analysis identified 2193 genes bound by ASPSCR1-TFE3, with 332 putative up-regulated direct targets including MET, CYP17A1, and UPP1. RNAi screens identified 12 target genes (including MET) that contribute to ASPSCR1-TFE3-positive cancer cell proliferation.\",\n      \"method\": \"Nuclear localization confirmed by microscopy, genome-wide ChIP-seq (location analysis), inducible expression system, RNAi functional screen, luciferase reporter assays\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genome-wide ChIP-seq, functional RNAi screen, and multiple validation methods in one integrated study\",\n      \"pmids\": [\"23288701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TUG (ASPSCR1) proteolytic processing in skeletal muscle controls GLUT4 translocation to T-tubule fractions and impacts systemic glucose homeostasis and energy expenditure. In muscle-specific transgenic mice expressing a truncated TUG fragment (UBX-Cter), TUG proteolysis becomes constitutive, GLUT4 is translocated during fasting, fasting plasma glucose and insulin are reduced, and whole-body VO2, VCO2, and energy expenditure are increased ~12-13%.\",\n      \"method\": \"Muscle-specific transgenic mouse model, 2-deoxyglucose uptake, hyperinsulinemic clamp, subcellular fractionation, metabolic cage measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean transgenic mouse model with multiple in vivo metabolic readouts and direct GLUT4 localization measurement\",\n      \"pmids\": [\"23744065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The TUG (ASPSCR1) C-terminus is acetylated; acetylation modulates its interaction with the Golgi matrix protein ACBD3, reducing TUG-ACBD3 binding while not affecting Golgin-160 binding. SIRT2 deacetylase binds TUG and deacetylates it; SIRT2 overexpression reduces TUG acetylation and redistributes GLUT4 to the plasma membrane. TUG also controls vesicle translocation by interacting with IRAP as well as GLUT4, coordinating IRAP targeting and vasopressin inactivation in vivo.\",\n      \"method\": \"Acetylation site identification, Co-IP, overexpression/knockdown of SIRT2, SIRT2 knockout mice, glucose tolerance tests, subcellular fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — post-translational modification identified with writer/eraser, functional mutagenesis, and in vivo knockout validation\",\n      \"pmids\": [\"25561724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TUG (ASPSCR1) proteolysis controls IRAP targeting to T-tubules in skeletal muscle and regulates vasopressin inactivation in vivo. Recombinant IRAP binds to TUG, mapped to a short peptide in IRAP previously shown to be critical for GLUT4 intracellular retention. In 3T3-L1 adipocytes, IRAP is present in TUG-bound membranes and released by insulin stimulation.\",\n      \"method\": \"Transgenic mouse model with constitutive TUG proteolysis, subcellular fractionation, recombinant protein binding/mapping, in vivo vasopressin/copeptin measurements, renal AQP2 analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding mapped to specific peptide, functional in vivo consequence demonstrated in transgenic mice\",\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 p97 hexamer disassembly. ASPL efficiently promotes p97 hexamer disassembly, forming stable p97:ASPL heterotetramers. This is accompanied by reorientation of the p97 D2 ATPase domain and loss of its ATPase activity. Overproduction of ASPL disrupts p97 hexamer function in ERAD.\",\n      \"method\": \"Quantitative interaction mapping, high-resolution structural studies (crystal structure), in vitro hexamer disassembly biochemical assay, domain mutagenesis, ERAD functional assay, cell death assays with engineered eUBX polypeptides\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with reconstituted in vitro biochemical assay and mutagenesis, with cellular functional validation\",\n      \"pmids\": [\"27762274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ASPL-TFE3 oncoprotein directly transactivates p21 (p21WAF1/CIP1) promoter in a p53-independent manner, causing cell cycle arrest and cellular senescence in human bone marrow-derived mesenchymal stem cells. ASPL-TFE3-induced senescence involves upregulation of SASP-associated proinflammatory cytokines.\",\n      \"method\": \"Ectopic expression, reporter assay (p21 promoter), p21 siRNA rescue, senescence-associated β-galactosidase assay, tetracycline-inducible expression in MSCs\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding assay and siRNA rescue in relevant cell type, single lab\",\n      \"pmids\": [\"27673450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Usp25m (muscle splice form of Usp25) is the protease required for insulin-stimulated TUG (ASPSCR1) 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 addition. TUG proteolysis generates TUGUL, which modifies the KIF5B kinesin motor; TUG proteolysis is required to load GLUT4 onto KIF5B motors. In diet-induced insulin resistance, TUG proteolysis and Usp25m abundance are reduced in adipose tissue.\",\n      \"method\": \"Protein interaction (co-IP, pulldown), reconstitution of TUG cleavage in nonadipocytes by transfection, colocalization microscopy, kinesin modification assay, diet-induced insulin resistance model in rodents\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — identification of the specific protease with reconstitution in nonadipocytes, multiple orthogonal methods, in vivo validation\",\n      \"pmids\": [\"29773651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The N-terminal ubiquitin-like domain (UBL1, residues 10-83) of TUG (ASPSCR1) adopts a beta-grasp/ubiquitin-like topology as determined by NMR spectroscopy. This domain is not required for in vitro association with GLUT4 and lacks the C-terminal diglycine motif required for conjugation and the Ile-44 hydrophobic face for ubiquitin recognition.\",\n      \"method\": \"NMR spectroscopy (structure determination), backbone dynamics analysis, in vitro binding assay\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure determination, but functional role of this specific domain not fully resolved\",\n      \"pmids\": [\"16501224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TUG (ASPSCR1) proteolysis by Usp25m generates TUGUL (N-terminal product) that modifies KIF5B kinesin in adipocytes, and generates a C-terminal cleavage product that enters the nucleus, binds PPARγ and PGC-1α, and regulates gene expression to promote fatty acid oxidation and thermogenesis by upregulating sarcolipin and UCP1. The ATE1 arginyltransferase regulates stability of the TUG C-terminal product via an N-degron pathway. The PPARγ2 Pro12Ala polymorphism (which reduces diabetes risk) enhances TUG binding to PPARγ.\",\n      \"method\": \"Muscle-specific Tug (Aspscr1) knockout mice, muscle-specific constitutive TUG cleavage mice, nuclear fractionation, Co-IP with PPARγ/PGC-1α, gene expression analysis, metabolic phenotyping\",\n      \"journal\": \"Nature metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean muscle-specific KO and constitutive cleavage mouse models with multiple orthogonal mechanistic readouts\",\n      \"pmids\": [\"33686286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ASPL-TFE3 fusion protein translocates into the nucleus and transcriptionally activates the lysosome-autophagy pathway by binding to promoters of lysosome-related genes, enabling RCC cells to escape energy stress. ASPL-TFE3 escapes regulation by the classic mTOR-TFE3 signal and instead activates phospho-mTOR and its downstream targets.\",\n      \"method\": \"Promoter binding assays (ChIP), in vitro and in vivo proliferation assays, autophagy flux measurement, pathway inhibition studies\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP for promoter binding with functional validation in vitro and in vivo, single lab\",\n      \"pmids\": [\"33846569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TUG (ASPSCR1) ubiquitin-like processing is the central mechanism retaining GLUT4 storage vesicles at the Golgi matrix; intact TUG binds vesicle cargoes (GLUT4, IRAP) with its N-terminus and Golgi matrix proteins (Golgin-160, ACBD3) with its C-terminus. In adipocytes, TUGUL modifies KIF5B to transport vesicles; the C-terminal product is extracted from the Golgi matrix by p97 (VCP) ATPase after TUG cleavage.\",\n      \"method\": \"Review integrating prior biochemical, genetic, and structural data; p97 extraction role supported by prior biochemical studies\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review article synthesizing prior experimental work; p97 extraction model cited from prior mechanistic studies\",\n      \"pmids\": [\"36246906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Mutant p97 proteins show reduced binding to human TUG/ASPL/UBXD9 compared to wild-type p97, and both human and Dictyostelium UBXD9 (TUG/ASPL) very efficiently disassemble wild-type p97 hexamers into monomers but are less effective on mutant p97. Binding affinity differences are species-, mutation-, and ATP-dependent.\",\n      \"method\": \"Pull-down assays, surface plasmon resonance, sucrose density gradient ultracentrifugation, co-immunoprecipitation\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding quantified by SPR with functional hexamer disassembly assay, replicates and extends prior findings\",\n      \"pmids\": [\"27132113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASPSCR1::TFE3 fusion transcription factor is dispensable for in vitro tumor maintenance but required for in vivo ASPS tumor development via angiogenesis. ASPSCR1::TFE3 associates with super-enhancers at its binding sites; its loss induces super-enhancer redistribution affecting angiogenesis pathway genes. Key angiogenic targets identified by epigenomic CRISPR/dCas9 screening include Pdgfb, Rab27a, Sytl2, and Vwf; Rab27a and Sytl2 upregulation promotes angiogenic factor-trafficking for vascular network construction.\",\n      \"method\": \"In vitro vs. in vivo tumor growth comparison, ChIP-seq for super-enhancers, epigenomic CRISPR/dCas9 screen, functional validation of specific target genes\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo genetic requirement demonstrated with CRISPR, genome-wide epigenomic analysis and functional target validation\",\n      \"pmids\": [\"37029109\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ASPSCR1 (TUG/ASPL/UBXD9) functions in two distinct mechanistic contexts: (1) as a tethering protein in fat and muscle cells that sequesters 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 C-terminus — insulin activates Usp25m to cleave TUG, releasing TUGUL (which modifies KIF5B kinesin for vesicle transport) and a C-terminal product (extracted by p97 ATPase) that enters the nucleus to bind PPARγ/PGC-1α and promote lipid oxidation and thermogenesis; and (2) when fused to TFE3 via the ASPS-specific der(17)t(X;17)(p11.2;q25) translocation, the ASPSCR1-TFE3 fusion oncoprotein localizes to the nucleus and acts as an aberrant, potently activating transcription factor driving expression of angiogenesis, autophagy-lysosomal, and cell cycle target genes to promote alveolar soft part sarcoma and Xp11 translocation renal cell carcinoma.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ASPSCR1 (also called TUG, ASPL, or UBXD9) functions as a bifunctional tethering and signaling protein that governs insulin-stimulated glucose transporter mobilization and, when proteolytically processed, coordinates both vesicle transport and nuclear transcriptional programs controlling energy metabolism. In unstimulated adipocytes and myocytes, intact ASPSCR1 retains GLUT4/IRAP-containing storage vesicles at the Golgi matrix by binding vesicle cargoes via its N-terminus and Golgi matrix proteins (Golgin-160, ACBD3) via its C-terminus; insulin triggers Usp25m-mediated endoproteolytic cleavage, releasing an N-terminal ubiquitin-like modifier (TUGUL) that modifies KIF5B kinesin for vesicle transport, while the C-terminal product is extracted by p97/VCP ATPase, enters the nucleus, and binds PPARγ/PGC-1α to promote fatty acid oxidation and thermogenesis [PMID:17202135, PMID:22610098, PMID:29773651, PMID:33686286]. ASPSCR1 also directly disassembles p97 hexamers into monomers through its extended UBX domain, forming stable p97:ASPSCR1 heterotetramers and modulating p97-dependent processes including ERAD and Golgi reassembly [PMID:22207755, PMID:27762274]. The recurrent t(X;17)(p11.2;q25) chromosomal translocation fuses ASPSCR1 to TFE3, producing an ASPSCR1-TFE3 fusion oncoprotein that acts as an aberrant, constitutively nuclear transcriptional activator driving alveolar soft part sarcoma and Xp11 translocation renal cell carcinoma through super-enhancer-mediated upregulation of angiogenesis, autophagy-lysosomal, and cell cycle target genes [PMID:11244503, PMID:23288701, PMID:37029109].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of the ASPSCR1-TFE3 fusion as the product of the ASPS-defining translocation established ASPSCR1 as a gene whose disruption drives sarcoma and renal carcinoma through creation of an aberrant transcription factor.\",\n      \"evidence\": \"RT-PCR, FISH, Southern blot, and sequencing across multiple ASPS and renal tumor cases\",\n      \"pmids\": [\"11244503\", \"11438465\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Normal function of ASPSCR1 protein was unknown\", \"Mechanism by which the fusion activates transcription was not defined\", \"Whether fusion requires both gene products or acts dominantly was unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Structural determination of the ASPSCR1 N-terminal domain revealed a ubiquitin-like (UBL) fold, providing the first indication that ASPSCR1 might participate in ubiquitin-like modification or recognition pathways despite lacking classical conjugation motifs.\",\n      \"evidence\": \"NMR spectroscopy solution structure with in vitro binding assays\",\n      \"pmids\": [\"16501224\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of the UBL domain in cells was not established\", \"Physiological binding partners of this domain were not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that ASPSCR1/TUG retains GLUT4 in intracellular compartments and that its depletion phenocopies insulin-stimulated GLUT4 translocation established the protein's core physiological function as a GLUT4 storage vesicle tether.\",\n      \"evidence\": \"siRNA knockdown, dominant-negative expression, glucose uptake assays, and direct GLUT4 binding in 3T3-L1 adipocytes\",\n      \"pmids\": [\"17202135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How insulin signals to release TUG-tethered vesicles was unknown\", \"The identity of the intracellular anchor for TUG was not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstration that ASPSCR1 binds p97/VCP and disassembles its hexamers linked ASPSCR1 to p97-dependent membrane trafficking and established a unique biochemical activity among UBX-domain cofactors.\",\n      \"evidence\": \"In vitro hexamer disassembly reconstitution, domain mapping, siRNA knockdown affecting Golgi reassembly in HeLa cells\",\n      \"pmids\": [\"22207755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of hexamer disassembly was not resolved\", \"Whether p97 disassembly was relevant to GLUT4 trafficking was unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of insulin-stimulated endoproteolytic cleavage of ASPSCR1 and its linkage to the Golgi matrix via PIST/Golgin-160 resolved how insulin mobilizes GLUT4 vesicles — by severing the tether rather than displacing it.\",\n      \"evidence\": \"Biochemical detection of cleavage products, TC10α epistasis by RNAi, cleavage-resistant mutant blocking insulin-responsive translocation in 3T3-L1 adipocytes\",\n      \"pmids\": [\"22610098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the protease was unknown\", \"Fate and function of cleavage products were not characterized\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Genome-wide identification of ASPSCR1-TFE3 transcriptional targets (including MET) and demonstration of its enhanced transactivation relative to wild-type TFE3 defined the oncogenic mechanism as constitutive, amplified transcriptional activation at hundreds of loci.\",\n      \"evidence\": \"ChIP-seq, RNAi proliferation screen, and luciferase reporter assays in ASPS cell lines\",\n      \"pmids\": [\"23288701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Epigenomic basis (enhancer remodeling) was not explored\", \"Whether all identified targets contribute to tumorigenesis was untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Transgenic mouse studies showed that constitutive ASPSCR1 proteolysis in muscle drives GLUT4 to T-tubules and increases whole-body energy expenditure, establishing systemic metabolic relevance beyond the adipocyte.\",\n      \"evidence\": \"Muscle-specific transgenic mouse with constitutive TUG cleavage, hyperinsulinemic clamp, metabolic cages\",\n      \"pmids\": [\"23744065\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear signaling consequences of TUG cleavage in muscle were not examined\", \"Whether muscle TUG cleavage occurs physiologically under insulin stimulation was not directly shown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Discovery that ASPSCR1 also tethers IRAP-containing vesicles and that acetylation by SIRT2 modulates ASPSCR1-ACBD3 binding expanded the tethering model to include vasopressin metabolism and post-translational regulation of tether affinity.\",\n      \"evidence\": \"Acetylation site mapping, SIRT2 knockout mice, recombinant IRAP binding assays, in vivo vasopressin measurements\",\n      \"pmids\": [\"25561724\", \"25944897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetyltransferase writing ASPSCR1 acetylation was not identified\", \"Quantitative contribution of acetylation vs. proteolysis to GLUT4 release was unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Crystallographic and biochemical analysis revealed that ASPSCR1's extended UBX domain drives p97 hexamer disassembly into stable heterotetramers with reoriented D2 domains, providing a structural mechanism for how overproduction disrupts ERAD.\",\n      \"evidence\": \"Crystal structure of p97-ASPL complex, quantitative disassembly and ATPase assays, ERAD reporter assay\",\n      \"pmids\": [\"27762274\", \"27132113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts requiring p97 disassembly by ASPSCR1 were not defined\", \"Whether p97 disassembly occurs during GLUT4 vesicle release was not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of Usp25m as the insulin-activated protease that cleaves ASPSCR1, generating TUGUL that modifies KIF5B kinesin, completed the enzymatic mechanism of GLUT4 vesicle release and linked diet-induced insulin resistance to reduced ASPSCR1 processing.\",\n      \"evidence\": \"Reconstitution of TUG cleavage by Usp25m transfection in non-adipocytes, co-IP, KIF5B modification assay, diet-induced obesity model\",\n      \"pmids\": [\"29773651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How insulin activates Usp25m catalytic activity was not resolved\", \"Whether Usp25m cleaves other substrates in this pathway was unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mouse genetic studies demonstrated that the ASPSCR1 C-terminal cleavage product enters the nucleus, binds PPARγ/PGC-1α, and drives fatty acid oxidation and thermogenesis, revealing a second signaling arm of ASPSCR1 proteolysis beyond vesicle transport.\",\n      \"evidence\": \"Muscle-specific Aspscr1 knockout and constitutive-cleavage mice, nuclear fractionation, co-IP with PPARγ/PGC-1α, metabolic and gene expression phenotyping\",\n      \"pmids\": [\"33686286\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How p97 extracts the C-terminal product from the Golgi matrix for nuclear import was not mechanistically resolved\", \"Whether the PPARγ Pro12Ala effect on TUG binding is sufficient to alter metabolic outcomes in humans was not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstration that ASPSCR1-TFE3 escapes mTOR-mediated cytoplasmic sequestration and transcriptionally activates the autophagy-lysosome pathway explained how fusion-driven cancers evade energy stress.\",\n      \"evidence\": \"ChIP for lysosomal gene promoters, autophagy flux assays, mTOR pathway analysis in RCC cells\",\n      \"pmids\": [\"33846569\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether autophagy activation is required for tumor maintenance or initiation was not distinguished\", \"Mechanism of mTOR escape was not structurally explained\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Epigenomic profiling revealed that ASPSCR1-TFE3 remodels super-enhancers to drive angiogenesis in vivo, identifying Rab27a/Sytl2-mediated angiogenic factor trafficking as the critical downstream effector for ASPS tumor vascularization.\",\n      \"evidence\": \"ChIP-seq for super-enhancers, CRISPR knockout of fusion in ASPS model, epigenomic dCas9 screen, in vivo tumor growth\",\n      \"pmids\": [\"37029109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether therapeutic targeting of angiogenic effectors can substitute for direct fusion inhibition was not tested\", \"Super-enhancer dependencies in renal cell carcinoma driven by the same fusion were not examined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how insulin activates Usp25m catalytic activity, how p97 extracts the ASPSCR1 C-terminal product from the Golgi for nuclear import, and whether ASPSCR1's p97-disassembly activity is physiologically linked to its GLUT4-tethering function.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Insulin-to-Usp25m signaling cascade is undefined\", \"p97 extraction mechanism during TUG cleavage not reconstituted\", \"No structural model of intact TUG tethering complex exists\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 4, 7, 8, 11, 13]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 4, 8, 15]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [5, 10, 14, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3, 4, 7, 15]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 11]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 13, 14]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2, 4, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [2, 4, 6, 8, 11, 15]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [2, 6, 11]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [7, 13]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 5, 10, 14, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 7, 11]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 13, 17]}\n    ],\n    \"complexes\": [\n      \"p97-ASPSCR1 heterotetramer\",\n      \"TUG-GLUT4/IRAP-Golgin-160/ACBD3 tethering complex\"\n    ],\n    \"partners\": [\n      \"VCP\",\n      \"SLC2A4\",\n      \"LNPEP\",\n      \"GOLGB1\",\n      \"ACBD3\",\n      \"USP25\",\n      \"KIF5B\",\n      \"PPARG\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}