{"gene":"TPI1","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2022,"finding":"TPI1 nuclear translocation (rather than its cytoplasmic glycolytic activity) drives oncogenic function in lung adenocarcinoma; nuclear accumulation is induced by extracellular stress such as chemotherapy agents and peroxide, facilitating chemoresistance.","method":"Knockdown/overexpression of TPI1, catalytic-dead mutants, subcellular fractionation, xenograft tumor models, IHC of clinical LUAD vs. adjacent normal tissue","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with specific phenotypic readout plus localization experiments showing nuclear shift; single lab but multiple orthogonal methods","pmids":["35246510"],"is_preprint":false},{"year":2023,"finding":"In human lung adenocarcinoma, TPI1 activity is regulated by phosphorylation at Ser21 by salt-inducible kinases (SIKs) in an LKB1-dependent manner, modulating metabolic flux between glycolysis completion and glycerol-lipid production. In mice, the equivalent residue is Cys21, which can be oxidized to alter TPI1 activity independently of SIKs/LKB1, revealing an evolutionary divergence in TPI1 regulation.","method":"Phosphoproteomics, metabolomics, site-directed mutagenesis, genetically engineered human cell lines and mouse models (GEMM)","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 1 — phosphoproteomics and metabolomics with mutagenesis in both human cell lines and mouse models; multiple orthogonal methods in a single study","pmids":["36715544"],"is_preprint":false},{"year":2024,"finding":"Dopaminylation of glutamine 65 (Q65) of TPI1 in endothelial cells directionally enhances TPI1's enzymatic activity to convert DHAP to GAP, shifting flux away from ether phospholipid synthesis toward glucose metabolism, thereby attenuating lipid peroxidation and suppressing ferroptosis to promote lung regeneration over fibrosis.","method":"Chemoproteomic identification of dopaminylation site, site-directed mutagenesis (Q65), metabolic flux analysis, ferroptosis assays, in vivo lung injury/fibrosis models","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 1 — chemoproteomic site identification combined with mutagenesis, metabolic assays, and in vivo validation; multiple orthogonal methods","pmids":["39111287"],"is_preprint":false},{"year":2022,"finding":"TPI1 interacts with SQSTM1/P62, and P62 promotes ubiquitin-dependent proteasomal degradation of TPI1 in breast cancer cells. TPI1 also interacts with CDCA5 to stabilize it, activating the PI3K/AKT/mTOR pathway and driving EMT and aerobic glycolysis.","method":"Co-IP, mass spectrometric analysis, ubiquitination assay, immunofluorescence, overexpression/knockdown in cells and mouse xenograft models","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2/3 — reciprocal Co-IP and ubiquitination assay with in vivo validation; single lab","pmids":["35509067"],"is_preprint":false},{"year":2021,"finding":"Rab20 downregulation in hepatocellular carcinoma reduces TPI1 loading into extracellular vesicles; EVs with reduced TPI1 enhance aerobic glycolysis and promote HCC cell growth and motility, establishing a mechanistic link between EV-associated TPI1 and tumor glucose metabolism.","method":"Proteomic profiling of EVs, Rab20 knockdown/restoration, TPI1 knockdown, glycolytic inhibitor rescue experiments, motility and growth assays","journal":"Journal of extracellular vesicles","confidence":"Medium","confidence_rationale":"Tier 2 — proteomic EV profiling combined with genetic perturbation and rescue by glycolytic inhibitor; single lab but multiple orthogonal approaches","pmids":["34401050"],"is_preprint":false},{"year":2019,"finding":"The Arg189 residue of TPI1 participates in two salt bridges on the backside of the enzyme dimer interface; mutation at this position (Arg189Gln) disrupts coordination of the substrate-binding site and key catalytic residues, markedly reducing protein stability and enzyme levels in vivo and causing neurologic deficits.","method":"Genomic engineering in Drosophila (homologous Arg mutation), compound heterozygote animal motor behavior assays, patient fibroblast protein quantification, structural analysis of dimer interface salt bridges","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"High","confidence_rationale":"Tier 1 — in vivo genetic model with functional behavioral readout combined with structural analysis and patient cell validation; multiple orthogonal methods","pmids":["31075491"],"is_preprint":false},{"year":2025,"finding":"TPI1 directly binds the BH3 domain of Beclin-1, competitively displacing Bcl-2 from Beclin-1 and relieving Bcl-2-mediated inhibition of autophagy initiation; this interaction promotes PIK3C3-C1 complex formation, enhances ULK1-mediated phosphorylation of Beclin-1 at Ser15, and drives gemcitabine resistance in bladder cancer.","method":"Mass spectrometry, co-immunoprecipitation, transcriptome sequencing, transmission electron microscopy, dual luciferase/ChIP-qPCR for c-Myc binding to TPI1 promoter, in vivo xenograft models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — MS-identified interaction confirmed by Co-IP with domain mapping and functional rescue; single lab with multiple orthogonal methods","pmids":["41429797"],"is_preprint":false},{"year":2025,"finding":"TPI1 interacts with AKT and MDM2 to form a trimeric complex; TPI1 enhances AKT-driven phosphorylation of MDM2 at Ser166, promoting p53 ubiquitination and degradation in bladder cancer. The MDM2-F2 truncation (residues 181–360) binds TPI1, with amino acid 317 being critical for this interaction.","method":"Co-IP, domain-mapping with MDM2 truncation mutants, AKT knockdown rescue, ubiquitination assays, in vitro and in vivo functional assays","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with domain mapping and functional rescue; single lab with multiple complementary assays","pmids":["40097123"],"is_preprint":false},{"year":2024,"finding":"LDHA-mediated histone H3K18 lactylation (H3K18la) at the TPI1 promoter enhances TPI1 transcription; mutation of K69 in TPI1 ameliorates LPS-induced glycolysis in an OA chondrocyte cell model, identifying a direct epigenetic regulatory link between lactate metabolism and TPI1 expression.","method":"LDHA knockdown, H3K18la ChIP at TPI1 promoter, site-directed mutagenesis of TPI1 (K69), glycolysis assays, in vivo LDHA knockout OA mouse model","journal":"Autoimmunity","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP at TPI1 promoter combined with mutagenesis and in vivo knockout; single lab but multiple methods","pmids":["39086231"],"is_preprint":false},{"year":2025,"finding":"In the context of salt-sensitive hypertension, GRK4 R65L increases TPI1 phosphorylation and promotes its nuclear translocation; nuclear TPI1 reduces DHAP levels, which elevates H3K27ac at the Hao2 promoter, increasing Hao2 expression and renal oxidative stress, thereby causing a rightward shift in pressure-natriuresis and salt-sensitive hypertension.","method":"Immunoprecipitation-mass spectrometry (GRK4–TPI1 interaction), AAV9-mediated GRK4 depletion, measurement of nuclear DHAP, H3K27ac ChIP at Hao2 promoter, DHAP supplementation in HK-2 cells, GRK4 R65L transgenic mice","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 — IP-MS-identified interaction corroborated by genetic depletion, ChIP, and metabolite rescue in vitro and in vivo; single lab","pmids":["41407053"],"is_preprint":false},{"year":2025,"finding":"USP5 deubiquitinase stabilizes TPI1 protein by removing its ubiquitin modifications; propofol increases TPI1 ubiquitination and reduces TPI1 protein stability, suppressing glycolysis and lung cancer progression through this USP5/TPI1 axis.","method":"Ubiquitination analysis, Co-IP, Western blot, xenograft in vivo models, glycolysis assays, STRING interaction database validation","journal":"Biochemical genetics","confidence":"Medium","confidence_rationale":"Tier 3 — ubiquitination assay and Co-IP with in vivo validation; single lab, single interaction approach","pmids":["40956511"],"is_preprint":false},{"year":2025,"finding":"TPI1 silencing in cisplatin-resistant oral squamous cell carcinoma increases intracellular ROS, free iron, and lipid peroxidation, promoting ferroptotic cell death; TPI1 overexpression protects cells from ferroptosis, establishing TPI1 as a regulator of ferroptosis sensitivity.","method":"TPI1 knockdown/overexpression in cisplatin-resistant OSCC lines, measurement of lipid ROS, free iron, and lipid peroxidation markers, in vivo xenograft models, ferroptosis-related gene expression analysis","journal":"Biomedicines","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with multiple ferroptosis markers and in vivo validation; single lab","pmids":["40427052"],"is_preprint":false},{"year":2024,"finding":"The lncRNA Linc00942 (Linc00942) interacts with TPI1 and PKM2, promoting their phosphorylation, dimerization, and nuclear translocation; nuclear TPI1/PKM2 increases H3K4 acetylation and activates the STAT3/P300 axis, resulting in SOX9 transcriptional activation and TMZ resistance in glioblastoma.","method":"ChIRP-MS and ChIRP-WB to identify Linc00942–TPI1/PKM2 interactions, Co-IP, nuclear fractionation, SOX9 knockdown rescue in vitro and in vivo","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 — ChIRP-MS interaction discovery confirmed by Co-IP and functional rescue; single lab, multiple orthogonal methods","pmids":["39342418"],"is_preprint":false},{"year":2024,"finding":"The circular RNA circ-231 interacts with eIF4A3 and STAU1; this tripartite complex unwinds the secondary structure in the 5'UTR of TPI1 mRNA, enhancing its translation without altering mRNA transcript levels, thereby promoting ESCC cell migration and proliferation.","method":"ChIRP-MS, RNA immunoprecipitation, RNA pulldown, co-immunoprecipitation, EGFP reporter assay for 5'UTR unwinding, in vitro and in vivo proliferation/migration assays","journal":"Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2 — multiple RNA-protein interaction methods (RIP, pulldown, ChIRP-MS) with functional reporter validation; single lab","pmids":["38577609"],"is_preprint":false},{"year":2026,"finding":"NOP2 methyltransferase deposits m5C modification on TPI1 mRNA, stabilizing it and increasing TPI1 protein expression; NOP2 knockdown reduces m5C on TPI1 mRNA and decreases TPI1 stability, impairing glycolysis in larynx cancer cells.","method":"MeRIP (methylated RNA immunoprecipitation), RIP, dual-luciferase reporter assay, NOP2 knockdown/overexpression, glycolysis assays, xenograft models","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — MeRIP and RIP confirm m5C on TPI1 mRNA; rescue experiment links NOP2 to TPI1-dependent glycolysis; single lab","pmids":["41498196"],"is_preprint":false},{"year":2025,"finding":"The R5G missense mutation in TPI1 produces a protein with essentially wild-type catalytic activity but markedly reduced steady-state protein levels due to increased instability of the mutant protein; compounds identified in a therapeutic screen significantly increased TPI1 protein levels and activity in patient cells with this allele, establishing protein stability as the primary pathogenic mechanism.","method":"Purification and biochemical characterization of recombinant TPIR5G, TPI activity assays, Western blot of patient fibroblasts, small-molecule treatment with TPI activity rescue assays","journal":"Genes","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro biochemical reconstitution of purified mutant protein combined with patient cell validation; single study but multiple orthogonal methods","pmids":["41153421"],"is_preprint":false},{"year":2025,"finding":"TPI1 promotes M2-like macrophage polarization in THP-1 cells and contributes to resistance to KRAS inhibitors in KRAS-mutant lung adenocarcinoma cells, identifying a role in tumor immune remodeling beyond its glycolytic function.","method":"TPI1 overexpression/knockdown functional assays in THP-1 macrophages and LUAD epithelial cells, KRAS inhibitor sensitivity assays, pan-cancer transcriptomic/proteomic/scRNA-seq analysis","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 — functional cell assays without detailed mechanistic pathway placement; single lab","pmids":["41447883"],"is_preprint":false},{"year":2025,"finding":"lncRNA HANR physically interacts with TPI1 protein, stabilizing it and promoting aerobic glycolysis and prostate cancer cell growth; silencing either HANR or TPI1 reduces glycolysis and tumor growth in vitro and in vivo.","method":"RNA immunoprecipitation, Co-IP, TPI1/HANR knockdown, glycolysis assays, in vivo xenograft models","journal":"Experimental cell research","confidence":"Low","confidence_rationale":"Tier 3 — single Co-IP/RIP identifying interaction with limited mechanistic follow-up; single lab","pmids":["40921293"],"is_preprint":false},{"year":2025,"finding":"Under hypoxia, TPI1 and HK2 protein levels increase in non-neuronal C6 glioma cells via IRES-mediated post-transcriptional regulation (not transcriptional upregulation); functional IRES elements were identified in the 5'UTR of TPI1 mRNA, with activity dependent on the polypyrimidine tract binding (PTB) protein.","method":"Di-cistronic and promoter-less di-cistronic reporter assays, MTT and LDH leakage assays under hypoxia, Western blot and qRT-PCR distinguishing protein from mRNA changes","journal":"Artificial cells, nanomedicine, and biotechnology","confidence":"Medium","confidence_rationale":"Tier 2 — di-cistronic IRES reporter assay directly demonstrates post-transcriptional regulation of TPI1; single lab but mechanistically rigorous","pmids":["40105374"],"is_preprint":false},{"year":1979,"finding":"TPI1 was regionally mapped to chromosome 12p (pter to p12) by karyological correlation analysis of human-Chinese hamster somatic cell hybrids with defined chromosome 12 deletions, establishing the chromosomal locus of the human TPI1 gene.","method":"Human-Chinese hamster somatic cell hybrid panel with X-ray/BrdU-induced chromosome breakage, isozyme marker analysis correlated to karyotype","journal":"Cytogenetics and cell genetics","confidence":"High","confidence_rationale":"Tier 1 — direct chromosomal mapping by somatic cell genetics; foundational mapping study replicated across multiple hybrid clones","pmids":["477403"],"is_preprint":false}],"current_model":"TPI1 is a homodimeric glycolytic enzyme that interconverts DHAP and GAP; its activity is regulated by LKB1/SIK-dependent phosphorylation at Ser21 (or oxidation of the equivalent Cys21 in mice), by dopaminylation at Q65 (which directionally enhances DHAP→GAP flux to suppress ferroptosis), and by ubiquitination/deubiquitination (promoted by SQSTM1/P62 and reversed by USP5); beyond cytoplasmic glycolysis, stress-induced nuclear translocation of TPI1 drives chemoresistance and alters histone acetylation-dependent transcription, while non-catalytic protein–protein interactions with Beclin-1, AKT/MDM2, and CDCA5 link TPI1 to autophagy regulation, p53 degradation, and PI3K/AKT/mTOR pathway activation in cancer contexts."},"narrative":{"teleology":[{"year":1979,"claim":"Mapping TPI1 to chromosome 12p established the gene's chromosomal locus, enabling subsequent molecular genetic studies of TPI deficiency.","evidence":"Somatic cell hybrid panel with karyotypic correlation of isozyme markers","pmids":["477403"],"confidence":"High","gaps":["No coding sequence or promoter characterization at this stage","Regulatory elements and tissue-specific expression uncharacterized"]},{"year":2019,"claim":"Structural analysis of the Arg189Gln mutation revealed that dimer-interface salt bridges are critical for protein stability rather than catalysis per se, explaining why pathogenic mutations reduce enzyme levels in vivo and cause neurologic deficits.","evidence":"Drosophila genomic engineering of homologous Arg mutation, patient fibroblast protein quantification, and structural modeling of dimer interface","pmids":["31075491"],"confidence":"High","gaps":["Mechanism linking reduced TPI levels to neurodegeneration unresolved","Whether all disease alleles act through instability or some affect catalysis differently"]},{"year":2022,"claim":"Discovery that TPI1 nuclear translocation—independent of its catalytic activity—drives oncogenic function and chemoresistance opened a non-glycolytic axis for TPI1 biology.","evidence":"Catalytic-dead mutants, subcellular fractionation, and xenograft models in lung adenocarcinoma","pmids":["35246510"],"confidence":"Medium","gaps":["Nuclear substrates or transcriptional targets of TPI1 not identified in this study","Signal triggering nuclear import not molecularly defined"]},{"year":2022,"claim":"Identification of SQSTM1/P62 as a ubiquitin-dependent degradation promoter and CDCA5 as a stabilization partner of TPI1 linked TPI1 protein turnover and PI3K/AKT/mTOR signaling in breast cancer.","evidence":"Reciprocal Co-IP, ubiquitination assays, and xenograft models","pmids":["35509067"],"confidence":"Medium","gaps":["E3 ligase mediating TPI1 ubiquitination not identified","Whether CDCA5 stabilization requires direct binding or is indirect"]},{"year":2023,"claim":"Phosphoproteomics resolved how LKB1 controls glycolytic vs. lipid-synthetic flux through SIK-mediated phosphorylation of TPI1 at Ser21, while revealing an evolutionary divergence (Cys21 oxidation in mice) in TPI1 regulation.","evidence":"Phosphoproteomics, metabolomics, site-directed mutagenesis in human cells and genetically engineered mouse models","pmids":["36715544"],"confidence":"High","gaps":["Structural basis for how Ser21 phosphorylation alters catalytic directionality unresolved","Whether other kinases phosphorylate Ser21 outside LKB1-deficient contexts"]},{"year":2024,"claim":"Dopaminylation at Q65 was shown to directionally enhance DHAP→GAP conversion, directly linking a novel post-translational modification to ferroptosis suppression and lung tissue regeneration.","evidence":"Chemoproteomic identification of dopaminylation site, Q65 mutagenesis, metabolic flux analysis, and in vivo lung injury models","pmids":["39111287"],"confidence":"High","gaps":["Enzyme(s) catalyzing TPI1 dopaminylation not identified","Reversibility and kinetics of dopaminylation unknown"]},{"year":2024,"claim":"Nuclear TPI1, in complex with PKM2 recruited by lncRNA Linc00942, was found to increase H3K4 acetylation and activate STAT3/P300-dependent SOX9 transcription, mechanistically connecting TPI1 nuclear function to epigenetic reprogramming and temozolomide resistance in glioblastoma.","evidence":"ChIRP-MS/WB for Linc00942–TPI1/PKM2 interaction, Co-IP, nuclear fractionation, SOX9 knockdown rescue in vitro and in vivo","pmids":["39342418"],"confidence":"Medium","gaps":["Whether TPI1 directly contacts chromatin or acts solely through protein–protein scaffolding","Generalizability beyond GBM not tested"]},{"year":2024,"claim":"Epigenetic feed-forward regulation was demonstrated: LDHA-generated lactate drives H3K18 lactylation at the TPI1 promoter to upregulate TPI1 transcription, creating a positive glycolytic loop.","evidence":"H3K18la ChIP at TPI1 promoter, K69 mutagenesis, LDHA knockout mouse model of osteoarthritis","pmids":["39086231"],"confidence":"Medium","gaps":["Whether H3K18la-driven TPI1 upregulation operates in non-inflammatory contexts","Relative contribution vs. other transcriptional regulators of TPI1"]},{"year":2025,"claim":"The non-catalytic interaction between TPI1 and Beclin-1's BH3 domain, which displaces Bcl-2 to activate autophagy initiation, established TPI1 as a direct modulator of the autophagy machinery and explained gemcitabine resistance in bladder cancer.","evidence":"MS-identified interaction, Co-IP with domain mapping, ULK1 phosphorylation readouts, xenograft models","pmids":["41429797"],"confidence":"Medium","gaps":["Structural basis for TPI1–Beclin-1 BH3 domain recognition unknown","Whether this interaction occurs under physiological (non-cancer) conditions"]},{"year":2025,"claim":"TPI1 scaffolds AKT and MDM2 into a trimeric complex to promote p53 degradation, revealing a second non-catalytic oncogenic mechanism distinct from its autophagy and epigenetic roles.","evidence":"Co-IP, MDM2 truncation domain mapping (residues 181–360, critical aa 317), AKT knockdown rescue, ubiquitination assays","pmids":["40097123"],"confidence":"Medium","gaps":["Whether TPI1–MDM2 binding is direct or bridged by AKT","Relevance outside bladder cancer models not tested"]},{"year":2025,"claim":"GRK4-mediated phosphorylation was shown to drive TPI1 nuclear translocation in renal tubular cells, lowering nuclear DHAP and elevating H3K27ac at the Hao2 promoter, mechanistically linking TPI1 to salt-sensitive hypertension and renal oxidative stress.","evidence":"IP-MS for GRK4–TPI1 interaction, AAV9-mediated GRK4 depletion, H3K27ac ChIP at Hao2 promoter, DHAP supplementation rescue, GRK4 R65L transgenic mice","pmids":["41407053"],"confidence":"Medium","gaps":["Specific TPI1 phosphorylation site(s) by GRK4 not mapped","Whether nuclear TPI1 directly binds chromatin or only modulates metabolite pools"]},{"year":2025,"claim":"USP5 was identified as the deubiquitinase that stabilizes TPI1, closing a gap in understanding TPI1 protein turnover and providing a druggable axis in lung cancer.","evidence":"Ubiquitination analysis, Co-IP, propofol treatment, xenograft models","pmids":["40956511"],"confidence":"Medium","gaps":["Specific ubiquitin chain type removed by USP5 unknown","Whether USP5 is the sole or dominant TPI1 deubiquitinase"]},{"year":2025,"claim":"Biochemical characterization of the R5G disease allele confirmed that protein instability (not loss of catalytic competence) is the primary pathogenic mechanism, and small molecules can rescue TPI1 protein levels in patient cells.","evidence":"Purified recombinant TPIR5G kinetics, Western blot of patient fibroblasts, small-molecule rescue screen","pmids":["41153421"],"confidence":"Medium","gaps":["In vivo efficacy and CNS penetration of stabilizing compounds not tested","Whether stabilizers work across diverse TPI deficiency alleles"]},{"year":null,"claim":"A unified structural and cell-biological model explaining how TPI1 partitions between cytoplasmic glycolysis, nuclear translocation, and non-catalytic protein scaffolding—and how these functions are coordinately regulated—remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal structure of post-translationally modified (phospho-Ser21, dopaminyl-Q65) TPI1","Nuclear import signal and receptor for TPI1 translocation unidentified","Relative quantitative contribution of non-catalytic vs. catalytic functions in normal physiology unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016853","term_label":"isomerase activity","supporting_discovery_ids":[1,2,5,15]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,7,3]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,9,12]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,2,8,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,11]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,7]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[9,12]}],"complexes":[],"partners":["BECN1","AKT1","MDM2","CDCA5","SQSTM1","USP5","PKM","GRK4"],"other_free_text":[]},"mechanistic_narrative":"TPI1 encodes the homodimeric glycolytic enzyme triosephosphate isomerase that interconverts dihydroxyacetone phosphate (DHAP) and glyceraldehyde-3-phosphate (GAP), and its catalytic activity is tuned by post-translational modifications including LKB1/SIK-dependent phosphorylation at Ser21 (which partitions flux between glycolysis and glycerol-lipid synthesis) and dopaminylation at Q65 (which directionally enhances DHAP→GAP conversion to suppress ferroptosis) [PMID:36715544, PMID:39111287]. Beyond cytoplasmic glycolysis, stress- and kinase-driven nuclear translocation of TPI1 alters histone acetylation landscapes—lowering nuclear DHAP elevates H3K27ac at select promoters and, in complex with PKM2, increases H3K4 acetylation—linking TPI1 to transcriptional reprogramming, chemoresistance, and salt-sensitive hypertension [PMID:35246510, PMID:39342418, PMID:41407053]. Non-catalytic protein–protein interactions extend TPI1's functions: it binds Beclin-1 to competitively displace Bcl-2 and activate autophagy, and scaffolds an AKT–MDM2 complex to promote p53 ubiquitination, while its stability is controlled by USP5-mediated deubiquitination and SQSTM1/P62-promoted proteasomal degradation [PMID:41429797, PMID:40097123, PMID:40956511, PMID:35509067]. Disease-causing missense mutations such as Arg189Gln and R5G destabilize the dimer and reduce steady-state protein levels rather than abolishing catalytic competence per se, establishing protein instability as the primary pathogenic mechanism in TPI deficiency [PMID:31075491, PMID:41153421]."},"prefetch_data":{"uniprot":{"accession":"P60174","full_name":"Triosephosphate isomerase","aliases":["Methylglyoxal synthase","Triose-phosphate isomerase"],"length_aa":249,"mass_kda":26.7,"function":"Triosephosphate isomerase is an extremely efficient metabolic enzyme that catalyzes the interconversion between dihydroxyacetone phosphate (DHAP) and D-glyceraldehyde-3-phosphate (G3P) in glycolysis and gluconeogenesis It is also responsible for the non-negligible production of methylglyoxal a reactive cytotoxic side-product that modifies and can alter proteins, DNA and lipids","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P60174/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/TPI1","classification":"Common Essential","n_dependent_lines":1041,"n_total_lines":1208,"dependency_fraction":0.8617549668874173},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TPI1","total_profiled":1310},"omim":[{"mim_id":"615512","title":"TRIOSEPHOSPHATE ISOMERASE DEFICIENCY; TPID","url":"https://www.omim.org/entry/615512"},{"mim_id":"600414","title":"PEROXISOME BIOGENESIS FACTOR 5; PEX5","url":"https://www.omim.org/entry/600414"},{"mim_id":"190450","title":"TRIOSEPHOSPHATE ISOMERASE 1; TPI1","url":"https://www.omim.org/entry/190450"},{"mim_id":"176267","title":"POTASSIUM CHANNEL, VOLTAGE-GATED, SHAKER-RELATED SUBFAMILY, MEMBER 5; KCNA5","url":"https://www.omim.org/entry/176267"},{"mim_id":"176260","title":"POTASSIUM CHANNEL, VOLTAGE-GATED, SHAKER-RELATED SUBFAMILY, MEMBER 1; KCNA1","url":"https://www.omim.org/entry/176260"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":2315.7},{"tissue":"tongue","ntpm":1873.5}],"url":"https://www.proteinatlas.org/search/TPI1"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P60174","domains":[{"cath_id":"3.20.20.70","chopping":"6-245","consensus_level":"high","plddt":97.4416,"start":6,"end":245}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P60174","model_url":"https://alphafold.ebi.ac.uk/files/AF-P60174-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P60174-F1-predicted_aligned_error_v6.png","plddt_mean":96.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TPI1","jax_strain_url":"https://www.jax.org/strain/search?query=TPI1"},"sequence":{"accession":"P60174","fasta_url":"https://rest.uniprot.org/uniprotkb/P60174.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P60174/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P60174"}},"corpus_meta":[{"pmid":"35509067","id":"PMC_35509067","title":"TPI1 activates the PI3K/AKT/mTOR signaling pathway to induce breast cancer progression by stabilizing CDCA5.","date":"2022","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35509067","citation_count":51,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34401050","id":"PMC_34401050","title":"TPI1-reduced extracellular vesicles mediated by Rab20 downregulation promotes aerobic glycolysis to drive hepatocarcinogenesis.","date":"2021","source":"Journal of extracellular vesicles","url":"https://pubmed.ncbi.nlm.nih.gov/34401050","citation_count":44,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"35246510","id":"PMC_35246510","title":"Elevated nuclear localization of glycolytic enzyme TPI1 promotes lung adenocarcinoma and enhances chemoresistance.","date":"2022","source":"Cell death & 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directing glucose metabolism over ether phospholipid synthesis, thereby attenuating lipid peroxidation and blocking ferroptosis in endothelial cells during lung regeneration.\",\n      \"method\": \"Chemoproteomic approach, site-specific mutagenesis, in vitro activity assays, metabolic flux analysis\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — chemoproteomic identification with mutagenesis of Q65 residue, functional metabolic consequence validated in vitro and in vivo\",\n      \"pmids\": [\"39111287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In human lung adenocarcinoma, TPI1 activity is regulated via phosphorylation at Ser21 by salt inducible kinases (SIKs) in an LKB1-dependent manner, modulating metabolic flux between glycolysis completion and glycerol lipid production; this regulatory mechanism is absent in mice where the equivalent residue is Cys and can be redox-regulated without LKB1.\",\n      \"method\": \"Phosphoproteomics, metabolomics, genetically engineered human cell lines and mouse models\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — phosphoproteomics and metabolomics with orthogonal genetic models establishing mechanistic divergence\",\n      \"pmids\": [\"36715544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TPI1 interacts with SQSTM1/P62, and P62 promotes ubiquitin-dependent proteasomal degradation of TPI1; TPI1 also interacts with CDCA5 to stabilize it, thereby activating the PI3K/AKT/mTOR pathway in breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, ubiquitination assay, immunofluorescence\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — reciprocal Co-IP and ubiquitination assay in single study with functional validation\",\n      \"pmids\": [\"35509067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TPI1 translocates to the cell nucleus in lung adenocarcinoma tumor tissues compared to cytoplasmic localization in normal adjacent tissues; this nuclear translocation is induced by extracellular stress (chemotherapy agents, peroxide) and mediates oncogenic function and chemoresistance independently of its glycolytic catalytic activity.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence in clinical specimens, knockdown with catalytic mutant rescue experiments, xenograft tumor growth assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by fractionation and IF tied to functional consequence, catalytic mutant distinguishes mechanism\",\n      \"pmids\": [\"35246510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Linc00942 (lncRNA) interacts with TPI1 and PKM2, promoting their phosphorylation, dimerization, and nuclear translocation; nuclear TPI1 and PKM2 increase H3K4 acetylation and activate the STAT3/P300 axis to transcriptionally upregulate SOX9, driving self-renewal and TMZ resistance in glioblastoma.\",\n      \"method\": \"ChIRP-MS, ChIRP-WB, co-immunoprecipitation, knockdown/rescue experiments in vitro and in vivo\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIRP-MS identifies interaction, Co-IP confirms, functional epistasis established\",\n      \"pmids\": [\"39342418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TPI1 directly binds the BH3 domain of Beclin-1, competitively disrupting Bcl-2/Beclin-1 interaction to relieve Bcl-2-mediated inhibition of Beclin-1, and promotes formation of PIK3C3-C1 complex and phosphorylation of Beclin-1 at Ser15, thereby enhancing autophagy and gemcitabine resistance in bladder cancer.\",\n      \"method\": \"Mass spectrometry, co-immunoprecipitation, transcriptome sequencing, transmission electron microscopy, domain-mapping with truncation mutants\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS-identified interaction confirmed by Co-IP with domain mapping; functional rescue experiments\",\n      \"pmids\": [\"41429797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TPI1 interacts with AKT and MDM2 to form a ternary protein complex; this interaction enhances AKT-driven phosphorylation of MDM2 at serine 166, promoting p53 ubiquitination and degradation. The MDM2-F2 truncation mutant (spanning residues 181-360) binds TPI1 with amino acid 317 playing a critical role.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping with truncation mutants, functional ubiquitination assays, knockdown rescue\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP with domain mapping, functional ubiquitination and phosphorylation readouts in single study\",\n      \"pmids\": [\"40097123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP5 deubiquitinase stabilizes TPI1 protein by removing ubiquitin modifications; propofol treatment increases TPI1 ubiquitination and reduces TPI1 protein stability, inhibiting lung cancer glycolysis and progression through this USP5/TPI1 axis.\",\n      \"method\": \"Western blot, ubiquitination assay, qRT-PCR, xenograft models, IHC\",\n      \"journal\": \"Biochemical genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — ubiquitination assay without direct deubiquitinase reconstitution; single lab\",\n      \"pmids\": [\"40956511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GRK4 R65L variant increases TPI1 phosphorylation and nuclear translocation in renal tubular cells under high salt conditions; nuclear TPI1 decreases DHAP levels (a downstream metabolite of TPI1 activity), which increases H3K27ac and Hao2 expression, elevating oxidative stress and causing salt-sensitive hypertension.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry, nuclear fractionation, metabolite measurement (DHAP), AAV9-mediated depletion, H3K27ac inhibitor treatment in vivo\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — IP-MS identifies interaction, multiple orthogonal methods (fractionation, metabolomics, genetic depletion) in single study\",\n      \"pmids\": [\"41407053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LDHA-mediated histone H3K18 lactylation (H3K18la) at the TPI1 promoter enhances TPI1 transcription activity in chondrocytes, promoting glycolysis and osteoarthritis progression; mutation of the K69 site ameliorates LPS-induced glycolysis.\",\n      \"method\": \"ChIP assay for H3K18la at TPI1 promoter, LDHA knockdown/knockout, site-directed mutagenesis (K69), in vivo OA mouse model\",\n      \"journal\": \"Autoimmunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrates H3K18la at TPI1 promoter, mutagenesis identifies functional site, in vivo validation\",\n      \"pmids\": [\"39086231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Circular RNA circ-231 interacts with eIF4A3 and promotes its interaction with STAU1; this complex binds and unwinds secondary structures in the 5' UTR of TPI1 mRNA to enhance TPI1 protein translation without affecting TPI1 mRNA levels, promoting ESCC progression.\",\n      \"method\": \"ChIRP-MS, RNA immunoprecipitation, RNA pulldown, co-immunoprecipitation, EGFP reporter assay\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIRP-MS and RIP identify interactions; reporter assay confirms 5'UTR mechanism; protein vs mRNA dissociation\",\n      \"pmids\": [\"38577609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The Arg189 residue of TPI1 participates in two salt bridges on the backside of the enzyme dimer; mutation at this position (Arg189Gln) alters coordination of the substrate-binding site and catalytic residues, causing reduced protein stability and markedly reduced TPI levels in vivo, leading to TPI deficiency with neurologic deficits.\",\n      \"method\": \"Protein biochemistry, Drosophila genomic engineering/mutagenesis at homologous residue, patient fibroblast analysis, structural modeling\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — structural analysis with mutagenesis in Drosophila model plus patient cell validation, multiple orthogonal methods\",\n      \"pmids\": [\"31075491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The TPI1 R5G missense mutant retains wild-type catalytic activity but shows markedly reduced steady-state protein levels due to reduced dimer stability, establishing that protein instability (not loss of catalytic activity) underlies disease pathogenesis for this TPI deficiency allele.\",\n      \"method\": \"Purified recombinant protein biochemistry, TPI activity assay, dimer stability assay, Western blot of patient cells\",\n      \"journal\": \"Genes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with purified protein and activity assays, confirmed in patient cells; single study\",\n      \"pmids\": [\"41153421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab20 expression in hepatocellular carcinoma cells controls the loading of TPI1 into extracellular vesicles (EVs); EVs with reduced TPI1 (from Rab20 knockdown cells) promote aerobic glycolysis in recipient HCC cells, driving cell growth and motility, and this effect is blocked by glycolytic inhibition.\",\n      \"method\": \"Proteomic profiling of EVs, Rab20 KD/OE experiments, TPI1 targeting to EVs, glycolytic inhibitor rescue\",\n      \"journal\": \"Journal of extracellular vesicles\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — proteomic EV profiling with functional rescue experiments; mechanistic link between EV TPI1 and glycolysis established\",\n      \"pmids\": [\"34401050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"The m5C methyltransferase NOP2 methylates TPI1 mRNA, increasing its stability and thus TPI1 protein expression; NOP2 knockdown reduces m5C modification on TPI1 mRNA, decreases TPI1 protein and mRNA stability, and impairs glycolysis in larynx cancer cells; overexpression of TPI1 rescues glycolysis impaired by NOP2 knockdown.\",\n      \"method\": \"MeRIP (methylated RNA immunoprecipitation), RIP, dual-luciferase reporter assay, knockdown/rescue, xenograft models\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MeRIP identifies m5C on TPI1 mRNA, functional rescue confirms epistatic relationship; single lab\",\n      \"pmids\": [\"41498196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The lncRNA HANR interacts with TPI1 protein to stabilize it, promoting aerobic glycolysis and tumor growth in prostate cancer; silencing HANR reduces TPI1 levels and phenocopies TPI1 knockdown.\",\n      \"method\": \"RNA immunoprecipitation/pulldown, co-immunoprecipitation, knockdown/rescue, in vitro and in vivo glycolysis assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single pulldown/Co-IP evidence for interaction; mechanism of stabilization not fully defined\",\n      \"pmids\": [\"40921293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TPI1 expression in non-neuronal C6 glioma cells is regulated post-transcriptionally under hypoxia via internal ribosome entry site (IRES) elements in its 5' UTR; polypyrimidine tract binding (PTB) protein promotes IRES-mediated TPI1 translation without increasing mRNA levels.\",\n      \"method\": \"Di-cistronic reporter assay, promoter-less di-cistronic assay, MTT assay, LDH leakage assay, Western blot vs mRNA comparison\",\n      \"journal\": \"Artificial cells, nanomedicine, and biotechnology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — reporter assay supports IRES but PTB interaction with TPI1 IRES not directly confirmed; single study\",\n      \"pmids\": [\"40105374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"c-Myc transcription factor binds to the TPI1 promoter region and transcriptionally activates TPI1 expression in bladder cancer, contributing to gemcitabine resistance.\",\n      \"method\": \"Dual luciferase reporter assay, ChIP-qPCR\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-qPCR and luciferase assay confirm c-Myc binding to TPI1 promoter; single study, functional link established only indirectly\",\n      \"pmids\": [\"41429797\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TPI1 (triosephosphate isomerase 1) is a glycolytic enzyme that catalyzes interconversion of DHAP and GAP; its activity is regulated by phosphorylation at Ser21 by LKB1-dependent SIK kinases, dopaminylation at Q65 (which directs metabolic flux away from ether phospholipid synthesis toward glycolysis to suppress ferroptosis), ubiquitination by P62/proteasome and stabilization by USP5, and transcriptional regulation by c-Myc and LDHA-mediated H3K18 lactylation; beyond its cytoplasmic metabolic role, TPI1 translocates to the nucleus under stress where it promotes chemoresistance and—via interaction with PKM2—activates histone acetylation and SOX9 transcription; TPI1 also engages protein complexes including TPI1–AKT–MDM2 (promoting p53 ubiquitination), TPI1–Beclin-1 (activating autophagy), and TPI1–CDCA5 (activating PI3K/AKT/mTOR), and its loading into extracellular vesicles is regulated by Rab20 to modulate paracrine metabolic signaling in cancer.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2022,\n      \"finding\": \"TPI1 nuclear translocation (rather than its cytoplasmic glycolytic activity) drives oncogenic function in lung adenocarcinoma; nuclear accumulation is induced by extracellular stress such as chemotherapy agents and peroxide, facilitating chemoresistance.\",\n      \"method\": \"Knockdown/overexpression of TPI1, catalytic-dead mutants, subcellular fractionation, xenograft tumor models, IHC of clinical LUAD vs. adjacent normal tissue\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with specific phenotypic readout plus localization experiments showing nuclear shift; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"35246510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In human lung adenocarcinoma, TPI1 activity is regulated by phosphorylation at Ser21 by salt-inducible kinases (SIKs) in an LKB1-dependent manner, modulating metabolic flux between glycolysis completion and glycerol-lipid production. In mice, the equivalent residue is Cys21, which can be oxidized to alter TPI1 activity independently of SIKs/LKB1, revealing an evolutionary divergence in TPI1 regulation.\",\n      \"method\": \"Phosphoproteomics, metabolomics, site-directed mutagenesis, genetically engineered human cell lines and mouse models (GEMM)\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — phosphoproteomics and metabolomics with mutagenesis in both human cell lines and mouse models; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"36715544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Dopaminylation of glutamine 65 (Q65) of TPI1 in endothelial cells directionally enhances TPI1's enzymatic activity to convert DHAP to GAP, shifting flux away from ether phospholipid synthesis toward glucose metabolism, thereby attenuating lipid peroxidation and suppressing ferroptosis to promote lung regeneration over fibrosis.\",\n      \"method\": \"Chemoproteomic identification of dopaminylation site, site-directed mutagenesis (Q65), metabolic flux analysis, ferroptosis assays, in vivo lung injury/fibrosis models\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — chemoproteomic site identification combined with mutagenesis, metabolic assays, and in vivo validation; multiple orthogonal methods\",\n      \"pmids\": [\"39111287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TPI1 interacts with SQSTM1/P62, and P62 promotes ubiquitin-dependent proteasomal degradation of TPI1 in breast cancer cells. TPI1 also interacts with CDCA5 to stabilize it, activating the PI3K/AKT/mTOR pathway and driving EMT and aerobic glycolysis.\",\n      \"method\": \"Co-IP, mass spectrometric analysis, ubiquitination assay, immunofluorescence, overexpression/knockdown in cells and mouse xenograft models\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — reciprocal Co-IP and ubiquitination assay with in vivo validation; single lab\",\n      \"pmids\": [\"35509067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab20 downregulation in hepatocellular carcinoma reduces TPI1 loading into extracellular vesicles; EVs with reduced TPI1 enhance aerobic glycolysis and promote HCC cell growth and motility, establishing a mechanistic link between EV-associated TPI1 and tumor glucose metabolism.\",\n      \"method\": \"Proteomic profiling of EVs, Rab20 knockdown/restoration, TPI1 knockdown, glycolytic inhibitor rescue experiments, motility and growth assays\",\n      \"journal\": \"Journal of extracellular vesicles\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomic EV profiling combined with genetic perturbation and rescue by glycolytic inhibitor; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"34401050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The Arg189 residue of TPI1 participates in two salt bridges on the backside of the enzyme dimer interface; mutation at this position (Arg189Gln) disrupts coordination of the substrate-binding site and key catalytic residues, markedly reducing protein stability and enzyme levels in vivo and causing neurologic deficits.\",\n      \"method\": \"Genomic engineering in Drosophila (homologous Arg mutation), compound heterozygote animal motor behavior assays, patient fibroblast protein quantification, structural analysis of dimer interface salt bridges\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vivo genetic model with functional behavioral readout combined with structural analysis and patient cell validation; multiple orthogonal methods\",\n      \"pmids\": [\"31075491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TPI1 directly binds the BH3 domain of Beclin-1, competitively displacing Bcl-2 from Beclin-1 and relieving Bcl-2-mediated inhibition of autophagy initiation; this interaction promotes PIK3C3-C1 complex formation, enhances ULK1-mediated phosphorylation of Beclin-1 at Ser15, and drives gemcitabine resistance in bladder cancer.\",\n      \"method\": \"Mass spectrometry, co-immunoprecipitation, transcriptome sequencing, transmission electron microscopy, dual luciferase/ChIP-qPCR for c-Myc binding to TPI1 promoter, in vivo xenograft models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS-identified interaction confirmed by Co-IP with domain mapping and functional rescue; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"41429797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TPI1 interacts with AKT and MDM2 to form a trimeric complex; TPI1 enhances AKT-driven phosphorylation of MDM2 at Ser166, promoting p53 ubiquitination and degradation in bladder cancer. The MDM2-F2 truncation (residues 181–360) binds TPI1, with amino acid 317 being critical for this interaction.\",\n      \"method\": \"Co-IP, domain-mapping with MDM2 truncation mutants, AKT knockdown rescue, ubiquitination assays, in vitro and in vivo functional assays\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with domain mapping and functional rescue; single lab with multiple complementary assays\",\n      \"pmids\": [\"40097123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LDHA-mediated histone H3K18 lactylation (H3K18la) at the TPI1 promoter enhances TPI1 transcription; mutation of K69 in TPI1 ameliorates LPS-induced glycolysis in an OA chondrocyte cell model, identifying a direct epigenetic regulatory link between lactate metabolism and TPI1 expression.\",\n      \"method\": \"LDHA knockdown, H3K18la ChIP at TPI1 promoter, site-directed mutagenesis of TPI1 (K69), glycolysis assays, in vivo LDHA knockout OA mouse model\",\n      \"journal\": \"Autoimmunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP at TPI1 promoter combined with mutagenesis and in vivo knockout; single lab but multiple methods\",\n      \"pmids\": [\"39086231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In the context of salt-sensitive hypertension, GRK4 R65L increases TPI1 phosphorylation and promotes its nuclear translocation; nuclear TPI1 reduces DHAP levels, which elevates H3K27ac at the Hao2 promoter, increasing Hao2 expression and renal oxidative stress, thereby causing a rightward shift in pressure-natriuresis and salt-sensitive hypertension.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry (GRK4–TPI1 interaction), AAV9-mediated GRK4 depletion, measurement of nuclear DHAP, H3K27ac ChIP at Hao2 promoter, DHAP supplementation in HK-2 cells, GRK4 R65L transgenic mice\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — IP-MS-identified interaction corroborated by genetic depletion, ChIP, and metabolite rescue in vitro and in vivo; single lab\",\n      \"pmids\": [\"41407053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP5 deubiquitinase stabilizes TPI1 protein by removing its ubiquitin modifications; propofol increases TPI1 ubiquitination and reduces TPI1 protein stability, suppressing glycolysis and lung cancer progression through this USP5/TPI1 axis.\",\n      \"method\": \"Ubiquitination analysis, Co-IP, Western blot, xenograft in vivo models, glycolysis assays, STRING interaction database validation\",\n      \"journal\": \"Biochemical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — ubiquitination assay and Co-IP with in vivo validation; single lab, single interaction approach\",\n      \"pmids\": [\"40956511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TPI1 silencing in cisplatin-resistant oral squamous cell carcinoma increases intracellular ROS, free iron, and lipid peroxidation, promoting ferroptotic cell death; TPI1 overexpression protects cells from ferroptosis, establishing TPI1 as a regulator of ferroptosis sensitivity.\",\n      \"method\": \"TPI1 knockdown/overexpression in cisplatin-resistant OSCC lines, measurement of lipid ROS, free iron, and lipid peroxidation markers, in vivo xenograft models, ferroptosis-related gene expression analysis\",\n      \"journal\": \"Biomedicines\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with multiple ferroptosis markers and in vivo validation; single lab\",\n      \"pmids\": [\"40427052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The lncRNA Linc00942 (Linc00942) interacts with TPI1 and PKM2, promoting their phosphorylation, dimerization, and nuclear translocation; nuclear TPI1/PKM2 increases H3K4 acetylation and activates the STAT3/P300 axis, resulting in SOX9 transcriptional activation and TMZ resistance in glioblastoma.\",\n      \"method\": \"ChIRP-MS and ChIRP-WB to identify Linc00942–TPI1/PKM2 interactions, Co-IP, nuclear fractionation, SOX9 knockdown rescue in vitro and in vivo\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIRP-MS interaction discovery confirmed by Co-IP and functional rescue; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"39342418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The circular RNA circ-231 interacts with eIF4A3 and STAU1; this tripartite complex unwinds the secondary structure in the 5'UTR of TPI1 mRNA, enhancing its translation without altering mRNA transcript levels, thereby promoting ESCC cell migration and proliferation.\",\n      \"method\": \"ChIRP-MS, RNA immunoprecipitation, RNA pulldown, co-immunoprecipitation, EGFP reporter assay for 5'UTR unwinding, in vitro and in vivo proliferation/migration assays\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple RNA-protein interaction methods (RIP, pulldown, ChIRP-MS) with functional reporter validation; single lab\",\n      \"pmids\": [\"38577609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NOP2 methyltransferase deposits m5C modification on TPI1 mRNA, stabilizing it and increasing TPI1 protein expression; NOP2 knockdown reduces m5C on TPI1 mRNA and decreases TPI1 stability, impairing glycolysis in larynx cancer cells.\",\n      \"method\": \"MeRIP (methylated RNA immunoprecipitation), RIP, dual-luciferase reporter assay, NOP2 knockdown/overexpression, glycolysis assays, xenograft models\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MeRIP and RIP confirm m5C on TPI1 mRNA; rescue experiment links NOP2 to TPI1-dependent glycolysis; single lab\",\n      \"pmids\": [\"41498196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The R5G missense mutation in TPI1 produces a protein with essentially wild-type catalytic activity but markedly reduced steady-state protein levels due to increased instability of the mutant protein; compounds identified in a therapeutic screen significantly increased TPI1 protein levels and activity in patient cells with this allele, establishing protein stability as the primary pathogenic mechanism.\",\n      \"method\": \"Purification and biochemical characterization of recombinant TPIR5G, TPI activity assays, Western blot of patient fibroblasts, small-molecule treatment with TPI activity rescue assays\",\n      \"journal\": \"Genes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical reconstitution of purified mutant protein combined with patient cell validation; single study but multiple orthogonal methods\",\n      \"pmids\": [\"41153421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TPI1 promotes M2-like macrophage polarization in THP-1 cells and contributes to resistance to KRAS inhibitors in KRAS-mutant lung adenocarcinoma cells, identifying a role in tumor immune remodeling beyond its glycolytic function.\",\n      \"method\": \"TPI1 overexpression/knockdown functional assays in THP-1 macrophages and LUAD epithelial cells, KRAS inhibitor sensitivity assays, pan-cancer transcriptomic/proteomic/scRNA-seq analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — functional cell assays without detailed mechanistic pathway placement; single lab\",\n      \"pmids\": [\"41447883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"lncRNA HANR physically interacts with TPI1 protein, stabilizing it and promoting aerobic glycolysis and prostate cancer cell growth; silencing either HANR or TPI1 reduces glycolysis and tumor growth in vitro and in vivo.\",\n      \"method\": \"RNA immunoprecipitation, Co-IP, TPI1/HANR knockdown, glycolysis assays, in vivo xenograft models\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP/RIP identifying interaction with limited mechanistic follow-up; single lab\",\n      \"pmids\": [\"40921293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Under hypoxia, TPI1 and HK2 protein levels increase in non-neuronal C6 glioma cells via IRES-mediated post-transcriptional regulation (not transcriptional upregulation); functional IRES elements were identified in the 5'UTR of TPI1 mRNA, with activity dependent on the polypyrimidine tract binding (PTB) protein.\",\n      \"method\": \"Di-cistronic and promoter-less di-cistronic reporter assays, MTT and LDH leakage assays under hypoxia, Western blot and qRT-PCR distinguishing protein from mRNA changes\",\n      \"journal\": \"Artificial cells, nanomedicine, and biotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — di-cistronic IRES reporter assay directly demonstrates post-transcriptional regulation of TPI1; single lab but mechanistically rigorous\",\n      \"pmids\": [\"40105374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1979,\n      \"finding\": \"TPI1 was regionally mapped to chromosome 12p (pter to p12) by karyological correlation analysis of human-Chinese hamster somatic cell hybrids with defined chromosome 12 deletions, establishing the chromosomal locus of the human TPI1 gene.\",\n      \"method\": \"Human-Chinese hamster somatic cell hybrid panel with X-ray/BrdU-induced chromosome breakage, isozyme marker analysis correlated to karyotype\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct chromosomal mapping by somatic cell genetics; foundational mapping study replicated across multiple hybrid clones\",\n      \"pmids\": [\"477403\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TPI1 is a homodimeric glycolytic enzyme that interconverts DHAP and GAP; its activity is regulated by LKB1/SIK-dependent phosphorylation at Ser21 (or oxidation of the equivalent Cys21 in mice), by dopaminylation at Q65 (which directionally enhances DHAP→GAP flux to suppress ferroptosis), and by ubiquitination/deubiquitination (promoted by SQSTM1/P62 and reversed by USP5); beyond cytoplasmic glycolysis, stress-induced nuclear translocation of TPI1 drives chemoresistance and alters histone acetylation-dependent transcription, while non-catalytic protein–protein interactions with Beclin-1, AKT/MDM2, and CDCA5 link TPI1 to autophagy regulation, p53 degradation, and PI3K/AKT/mTOR pathway activation in cancer contexts.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TPI1 encodes triosephosphate isomerase, a glycolytic enzyme that catalyzes the reversible interconversion of dihydroxyacetone phosphate (DHAP) and glyceraldehyde-3-phosphate (GAP), thereby controlling a metabolic branch point between glycolysis completion and glycerol lipid/ether phospholipid synthesis [PMID:36715544, PMID:39111287]. Its catalytic directionality and protein stability are regulated by multiple post-translational modifications, including LKB1/SIK-dependent phosphorylation at Ser21, dopaminylation at Q65 (which enhances DHAP-to-GAP conversion and suppresses ferroptosis), and ubiquitin-dependent proteasomal turnover mediated by SQSTM1/P62 [PMID:36715544, PMID:39111287, PMID:35509067]. Beyond its cytoplasmic metabolic role, TPI1 translocates to the nucleus under stress conditions, where it exerts catalytic-activity-independent oncogenic functions including promotion of histone acetylation via interaction with PKM2, activation of autophagy through competitive displacement of Bcl-2 from Beclin-1, and enhancement of p53 degradation by scaffolding an AKT–MDM2 complex [PMID:35246510, PMID:39342418, PMID:41429797, PMID:40097123]. Homozygous missense mutations that destabilize the TPI1 homodimer cause TPI deficiency, a rare metabolic disorder with neurologic manifestations, even when catalytic activity per se is preserved [PMID:31075491, PMID:41153421].\",\n  \"teleology\": [\n    {\n      \"year\": 2019,\n      \"claim\": \"Structural studies resolved how disease-causing mutations compromise TPI1 function: Arg189Gln disrupts inter-subunit salt bridges, destabilizing the dimer and reducing steady-state protein levels rather than simply abolishing catalysis, establishing dimer instability as the pathogenic mechanism in TPI deficiency.\",\n      \"evidence\": \"Drosophila genomic engineering at homologous residue, patient fibroblast analysis, structural modeling\",\n      \"pmids\": [\"31075491\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether all known TPI deficiency alleles act through dimer destabilization versus catalytic loss\",\n        \"No therapeutic rescue strategy demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The discovery that Rab20 controls TPI1 loading into extracellular vesicles established a paracrine dimension to TPI1 biology, showing that EV-mediated transfer of TPI1 modulates glycolysis in recipient cancer cells.\",\n      \"evidence\": \"Proteomic profiling of EVs from Rab20 KD/OE hepatocellular carcinoma cells with glycolytic inhibitor rescue\",\n      \"pmids\": [\"34401050\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which Rab20 selects TPI1 for EV loading is unknown\",\n        \"Whether EV-TPI1 transfer occurs in non-cancer settings not addressed\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Two studies established that TPI1 has catalytic-activity-independent roles in the nucleus: stress-induced nuclear translocation promotes chemoresistance in lung adenocarcinoma, and cytoplasmic TPI1 engages signaling complexes (with CDCA5 to activate PI3K/AKT/mTOR) while being targeted for ubiquitin-proteasomal degradation by SQSTM1/P62.\",\n      \"evidence\": \"Subcellular fractionation, immunofluorescence in clinical specimens, catalytic mutant rescue, Co-IP with mass spectrometry, ubiquitination assays\",\n      \"pmids\": [\"35246510\", \"35509067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Nuclear import signal/mechanism for TPI1 translocation not identified\",\n        \"Whether SQSTM1/P62-mediated degradation is selective for cytoplasmic versus nuclear TPI1 pools\",\n        \"Identity of nuclear binding partners mediating chemoresistance not resolved in these studies\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Phosphoproteomics revealed that LKB1-dependent SIK kinases phosphorylate TPI1 at Ser21 in human cells, establishing a kinase-regulated metabolic branch point between glycolysis and glycerol lipid synthesis — a regulatory axis absent in mice where the equivalent residue is Cys.\",\n      \"evidence\": \"Phosphoproteomics and metabolomics in genetically engineered human cell lines and mouse models of lung adenocarcinoma\",\n      \"pmids\": [\"36715544\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How Ser21 phosphorylation mechanistically alters substrate binding or catalytic directionality at the structural level\",\n        \"Whether other kinases can phosphorylate Ser21 independently of LKB1/SIK\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Chemoproteomic identification of dopaminylation at Q65 revealed a second post-translational modification that directionally enhances DHAP-to-GAP conversion, diverting metabolic flux away from ether phospholipid synthesis and thereby suppressing lipid peroxidation and ferroptosis during lung regeneration.\",\n      \"evidence\": \"Chemoproteomic approach with site-specific Q65 mutagenesis, in vitro activity assays, metabolic flux analysis in endothelial cells\",\n      \"pmids\": [\"39111287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Enzymology of Q65 dopaminylation (writer/eraser) not fully characterized\",\n        \"Whether dopaminylation regulates TPI1 in non-pulmonary tissues\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Multiple studies revealed transcriptional and translational regulation of TPI1: LDHA-mediated H3K18 lactylation activates TPI1 transcription in chondrocytes, while circ-231/eIF4A3/STAU1 complex enhances TPI1 translation by unwinding 5′ UTR structures, demonstrating that TPI1 expression is regulated at multiple layers.\",\n      \"evidence\": \"ChIP for H3K18la at TPI1 promoter with LDHA KO and mutagenesis; ChIRP-MS and RIP with EGFP reporter for translational regulation\",\n      \"pmids\": [\"39086231\", \"38577609\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether H3K18 lactylation at TPI1 promoter occurs in tissues beyond chondrocytes\",\n        \"Structural basis for eIF4A3/STAU1 recognition of TPI1 5′ UTR not resolved\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Studies in 2025 uncovered multiple moonlighting roles for TPI1 as a signaling scaffold: it binds Beclin-1's BH3 domain to activate autophagy by displacing Bcl-2, scaffolds an AKT–MDM2 complex to promote p53 ubiquitination, and cooperates with PKM2 in the nucleus to drive H3K4 acetylation and SOX9 transcription.\",\n      \"evidence\": \"Co-IP with domain mapping/truncation mutants, functional ubiquitination assays, ChIRP-MS for lncRNA-TPI1-PKM2 interaction, knockdown/rescue in multiple cancer models\",\n      \"pmids\": [\"41429797\", \"40097123\", \"39342418\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether TPI1's metabolic and scaffolding functions compete for the same protein pool\",\n        \"Structural basis for TPI1 interaction with Beclin-1 BH3 domain not determined\",\n        \"Whether TPI1–AKT–MDM2 complex formation depends on TPI1 post-translational modification state\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The R5G TPI deficiency allele was shown to retain full catalytic activity but suffer reduced dimer stability and lower steady-state protein levels, confirming that protein instability — not enzyme inactivity — is the general pathogenic mechanism in TPI deficiency.\",\n      \"evidence\": \"Purified recombinant protein biochemistry with activity and dimer stability assays, validated in patient cells\",\n      \"pmids\": [\"41153421\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether pharmacological chaperones can rescue dimer stability for clinical TPI deficiency alleles\",\n        \"How reduced TPI1 levels specifically cause neurologic rather than systemic glycolytic failure\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major unresolved questions include the structural basis for TPI1's nuclear import, how its metabolic and moonlighting functions are partitioned across subcellular pools, and whether post-translational modifications (phosphorylation, dopaminylation, ubiquitination) interact combinatorially to regulate both catalytic directionality and protein–protein interactions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No nuclear localization signal or import pathway identified for TPI1\",\n        \"No structural model of TPI1 in complex with any of its moonlighting partners (Beclin-1, AKT/MDM2, PKM2)\",\n        \"Combinatorial regulation by multiple PTMs not studied\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016853\", \"supporting_discovery_ids\": [0, 1, 11, 12]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 4, 8]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 9, 11, 12]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 7]}\n    ],\n    \"complexes\": [\n      \"TPI1 homodimer\",\n      \"TPI1-AKT-MDM2\",\n      \"TPI1-PKM2\"\n    ],\n    \"partners\": [\n      \"PKM2\",\n      \"BECN1\",\n      \"AKT1\",\n      \"MDM2\",\n      \"SQSTM1\",\n      \"CDCA5\",\n      \"USP5\",\n      \"GRK4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"TPI1 encodes the homodimeric glycolytic enzyme triosephosphate isomerase that interconverts dihydroxyacetone phosphate (DHAP) and glyceraldehyde-3-phosphate (GAP), and its catalytic activity is tuned by post-translational modifications including LKB1/SIK-dependent phosphorylation at Ser21 (which partitions flux between glycolysis and glycerol-lipid synthesis) and dopaminylation at Q65 (which directionally enhances DHAP→GAP conversion to suppress ferroptosis) [PMID:36715544, PMID:39111287]. Beyond cytoplasmic glycolysis, stress- and kinase-driven nuclear translocation of TPI1 alters histone acetylation landscapes—lowering nuclear DHAP elevates H3K27ac at select promoters and, in complex with PKM2, increases H3K4 acetylation—linking TPI1 to transcriptional reprogramming, chemoresistance, and salt-sensitive hypertension [PMID:35246510, PMID:39342418, PMID:41407053]. Non-catalytic protein–protein interactions extend TPI1's functions: it binds Beclin-1 to competitively displace Bcl-2 and activate autophagy, and scaffolds an AKT–MDM2 complex to promote p53 ubiquitination, while its stability is controlled by USP5-mediated deubiquitination and SQSTM1/P62-promoted proteasomal degradation [PMID:41429797, PMID:40097123, PMID:40956511, PMID:35509067]. Disease-causing missense mutations such as Arg189Gln and R5G destabilize the dimer and reduce steady-state protein levels rather than abolishing catalytic competence per se, establishing protein instability as the primary pathogenic mechanism in TPI deficiency [PMID:31075491, PMID:41153421].\",\n  \"teleology\": [\n    {\n      \"year\": 1979,\n      \"claim\": \"Mapping TPI1 to chromosome 12p established the gene's chromosomal locus, enabling subsequent molecular genetic studies of TPI deficiency.\",\n      \"evidence\": \"Somatic cell hybrid panel with karyotypic correlation of isozyme markers\",\n      \"pmids\": [\"477403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No coding sequence or promoter characterization at this stage\", \"Regulatory elements and tissue-specific expression uncharacterized\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Structural analysis of the Arg189Gln mutation revealed that dimer-interface salt bridges are critical for protein stability rather than catalysis per se, explaining why pathogenic mutations reduce enzyme levels in vivo and cause neurologic deficits.\",\n      \"evidence\": \"Drosophila genomic engineering of homologous Arg mutation, patient fibroblast protein quantification, and structural modeling of dimer interface\",\n      \"pmids\": [\"31075491\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking reduced TPI levels to neurodegeneration unresolved\", \"Whether all disease alleles act through instability or some affect catalysis differently\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that TPI1 nuclear translocation—independent of its catalytic activity—drives oncogenic function and chemoresistance opened a non-glycolytic axis for TPI1 biology.\",\n      \"evidence\": \"Catalytic-dead mutants, subcellular fractionation, and xenograft models in lung adenocarcinoma\",\n      \"pmids\": [\"35246510\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear substrates or transcriptional targets of TPI1 not identified in this study\", \"Signal triggering nuclear import not molecularly defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of SQSTM1/P62 as a ubiquitin-dependent degradation promoter and CDCA5 as a stabilization partner of TPI1 linked TPI1 protein turnover and PI3K/AKT/mTOR signaling in breast cancer.\",\n      \"evidence\": \"Reciprocal Co-IP, ubiquitination assays, and xenograft models\",\n      \"pmids\": [\"35509067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase mediating TPI1 ubiquitination not identified\", \"Whether CDCA5 stabilization requires direct binding or is indirect\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Phosphoproteomics resolved how LKB1 controls glycolytic vs. lipid-synthetic flux through SIK-mediated phosphorylation of TPI1 at Ser21, while revealing an evolutionary divergence (Cys21 oxidation in mice) in TPI1 regulation.\",\n      \"evidence\": \"Phosphoproteomics, metabolomics, site-directed mutagenesis in human cells and genetically engineered mouse models\",\n      \"pmids\": [\"36715544\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for how Ser21 phosphorylation alters catalytic directionality unresolved\", \"Whether other kinases phosphorylate Ser21 outside LKB1-deficient contexts\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Dopaminylation at Q65 was shown to directionally enhance DHAP→GAP conversion, directly linking a novel post-translational modification to ferroptosis suppression and lung tissue regeneration.\",\n      \"evidence\": \"Chemoproteomic identification of dopaminylation site, Q65 mutagenesis, metabolic flux analysis, and in vivo lung injury models\",\n      \"pmids\": [\"39111287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzyme(s) catalyzing TPI1 dopaminylation not identified\", \"Reversibility and kinetics of dopaminylation unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Nuclear TPI1, in complex with PKM2 recruited by lncRNA Linc00942, was found to increase H3K4 acetylation and activate STAT3/P300-dependent SOX9 transcription, mechanistically connecting TPI1 nuclear function to epigenetic reprogramming and temozolomide resistance in glioblastoma.\",\n      \"evidence\": \"ChIRP-MS/WB for Linc00942–TPI1/PKM2 interaction, Co-IP, nuclear fractionation, SOX9 knockdown rescue in vitro and in vivo\",\n      \"pmids\": [\"39342418\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TPI1 directly contacts chromatin or acts solely through protein–protein scaffolding\", \"Generalizability beyond GBM not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Epigenetic feed-forward regulation was demonstrated: LDHA-generated lactate drives H3K18 lactylation at the TPI1 promoter to upregulate TPI1 transcription, creating a positive glycolytic loop.\",\n      \"evidence\": \"H3K18la ChIP at TPI1 promoter, K69 mutagenesis, LDHA knockout mouse model of osteoarthritis\",\n      \"pmids\": [\"39086231\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether H3K18la-driven TPI1 upregulation operates in non-inflammatory contexts\", \"Relative contribution vs. other transcriptional regulators of TPI1\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The non-catalytic interaction between TPI1 and Beclin-1's BH3 domain, which displaces Bcl-2 to activate autophagy initiation, established TPI1 as a direct modulator of the autophagy machinery and explained gemcitabine resistance in bladder cancer.\",\n      \"evidence\": \"MS-identified interaction, Co-IP with domain mapping, ULK1 phosphorylation readouts, xenograft models\",\n      \"pmids\": [\"41429797\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis for TPI1–Beclin-1 BH3 domain recognition unknown\", \"Whether this interaction occurs under physiological (non-cancer) conditions\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"TPI1 scaffolds AKT and MDM2 into a trimeric complex to promote p53 degradation, revealing a second non-catalytic oncogenic mechanism distinct from its autophagy and epigenetic roles.\",\n      \"evidence\": \"Co-IP, MDM2 truncation domain mapping (residues 181–360, critical aa 317), AKT knockdown rescue, ubiquitination assays\",\n      \"pmids\": [\"40097123\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TPI1–MDM2 binding is direct or bridged by AKT\", \"Relevance outside bladder cancer models not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"GRK4-mediated phosphorylation was shown to drive TPI1 nuclear translocation in renal tubular cells, lowering nuclear DHAP and elevating H3K27ac at the Hao2 promoter, mechanistically linking TPI1 to salt-sensitive hypertension and renal oxidative stress.\",\n      \"evidence\": \"IP-MS for GRK4–TPI1 interaction, AAV9-mediated GRK4 depletion, H3K27ac ChIP at Hao2 promoter, DHAP supplementation rescue, GRK4 R65L transgenic mice\",\n      \"pmids\": [\"41407053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific TPI1 phosphorylation site(s) by GRK4 not mapped\", \"Whether nuclear TPI1 directly binds chromatin or only modulates metabolite pools\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"USP5 was identified as the deubiquitinase that stabilizes TPI1, closing a gap in understanding TPI1 protein turnover and providing a druggable axis in lung cancer.\",\n      \"evidence\": \"Ubiquitination analysis, Co-IP, propofol treatment, xenograft models\",\n      \"pmids\": [\"40956511\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific ubiquitin chain type removed by USP5 unknown\", \"Whether USP5 is the sole or dominant TPI1 deubiquitinase\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Biochemical characterization of the R5G disease allele confirmed that protein instability (not loss of catalytic competence) is the primary pathogenic mechanism, and small molecules can rescue TPI1 protein levels in patient cells.\",\n      \"evidence\": \"Purified recombinant TPIR5G kinetics, Western blot of patient fibroblasts, small-molecule rescue screen\",\n      \"pmids\": [\"41153421\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo efficacy and CNS penetration of stabilizing compounds not tested\", \"Whether stabilizers work across diverse TPI deficiency alleles\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A unified structural and cell-biological model explaining how TPI1 partitions between cytoplasmic glycolysis, nuclear translocation, and non-catalytic protein scaffolding—and how these functions are coordinately regulated—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal structure of post-translationally modified (phospho-Ser21, dopaminyl-Q65) TPI1\", \"Nuclear import signal and receptor for TPI1 translocation unidentified\", \"Relative quantitative contribution of non-catalytic vs. catalytic functions in normal physiology unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016853\", \"supporting_discovery_ids\": [1, 2, 5, 15]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 7, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 9, 12]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 2, 8, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 11]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 7]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [9, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"BECN1\",\n      \"AKT1\",\n      \"MDM2\",\n      \"CDCA5\",\n      \"SQSTM1\",\n      \"USP5\",\n      \"PKM\",\n      \"GRK4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}