{"gene":"TPD52L2","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2020,"finding":"TPD52L2 (TPD54) defines a new class of intracellular transport vesicles termed intracellular nanovesicles (INVs) of ~30 nm diameter, and is involved in multiple membrane trafficking pathways including anterograde traffic, recycling, and Golgi integrity. Rerouting TPD54 to mitochondria captured small vesicles at the mitochondrial surface; INVs contain specific cargo, R-SNAREs for fusion, and 16 out of 43 tested Rab GTPases.","method":"Inducible mitochondrial rerouting assay, super-resolution imaging, co-immunoprecipitation, vesicle capture and cargo/SNARE/Rab profiling","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (live imaging, rerouting, super-resolution, proteomics) in a single rigorous study","pmids":["31672706"],"is_preprint":false},{"year":2022,"finding":"TPD52L2 (TPD54) binds intracellular nanovesicles via an extended amphipathic helix region; AH2 and AH3 helices are predominant for membrane binding in cells and in vitro. AH3 functions as an amphipathic lipid packing sensor (ALPS) motif enabling curvature-dependent membrane binding, and TPD54 binding to liposomes is sensitive to membrane curvature and lipid unsaturation.","method":"Limited proteolysis, CD spectroscopy, tryptophan fluorescence, cysteine mutagenesis with membrane-sensitive probe, site-directed mutagenesis, liposome binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis and multiple biophysical methods in a single study","pmids":["35714773"],"is_preprint":false},{"year":2019,"finding":"TPD52L2 (TPD54) localizes to mitochondria and binds to pyruvate dehydrogenase E1α, stabilizing it by blocking PDK1-mediated serine 232 phosphorylation. TPD54 knockdown increases PDH E1α protein degradation, decreases PDH enzyme activity, reduces mitochondrial oxygen consumption and ROS production, contributing to metformin resistance in breast cancer cells.","method":"Immunoprecipitation followed by mass spectrometry, Western blot, site-directed mutagenesis, cell viability assays, ROS measurement, mitochondrial localization by immunofluorescence","journal":"Cancer & metabolism","confidence":"High","confidence_rationale":"Tier 1-2 — IP-MS binding identification plus mutagenesis and functional enzymatic readout in one study","pmids":["30697423"],"is_preprint":false},{"year":2013,"finding":"TPD52L2 (TPD54) is a negative regulator of ECM-dependent migration and cell attachment in oral squamous cell carcinoma cells. TPD54 knockdown increases anchorage-independent growth, ECM-dependent migration, and cell attachment, and activates Akt even without serum; these effects are mediated by talin1-dependent inside-out integrin signaling.","method":"siRNA knockdown, exogenous overexpression of splice variants, migration and attachment assays, Western blot for integrin subunits, talin1, E-cadherin, and Akt activation","journal":"Cellular oncology (Dordrecht, Netherlands)","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD/OE with defined cellular phenotype and partial pathway placement via talin1/Akt","pmids":["23529586"],"is_preprint":false},{"year":2013,"finding":"TPD52L2 interacts with hABCF3 (an ATP-binding cassette protein); this interaction was identified by yeast two-hybrid and confirmed by co-immunoprecipitation and co-localization. The interaction domain was mapped to the first 200 amino acids of hABCF3, and a truncated hABCF3 lacking this region impairs hABCF3-mediated cell proliferation.","method":"Yeast two-hybrid, co-immunoprecipitation, co-localization by immunofluorescence, truncation mutagenesis, proliferation assays","journal":"Molecular biology reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — reciprocal Co-IP and domain mapping with functional consequence","pmids":["24052230"],"is_preprint":false},{"year":2018,"finding":"TPD52L2 regulates glioblastoma cell invasion through the CTNNB1/β-catenin and SNAI1/Snail-mediated epithelial-mesenchymal transition (EMT) pathway. Downregulation of TPD52L2 enhances cell invasion via upregulation of this pathway, while overexpression reverses invasion and reduces proliferation sensitivity to temozolomide.","method":"Proteomics analysis, siRNA knockdown, overexpression, invasion assays in vitro and in vivo, Western blot for β-catenin and Snail","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD/OE with pathway placement via proteomics and western blot, in vivo validation","pmids":["29106517"],"is_preprint":false},{"year":2017,"finding":"TPD52L2 is a direct target of miR-485-5p in glioma; miR-485-5p overexpression reduces TPD52L2 expression and inhibits glioma cell proliferation, migration, and invasion in vitro and in vivo.","method":"Luciferase reporter assay (implied as direct target), miRNA overexpression, siRNA knockdown, cell proliferation/migration/invasion assays, xenograft in vivo model","journal":"American journal of translational research","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct target validation with functional rescue experiments in vitro and in vivo","pmids":["28804551"],"is_preprint":false},{"year":2017,"finding":"TPD52L2 (Tpd52l2) is a direct target of miR-217 in pancreatic adenocarcinoma; knockdown of Tpd52l2 inhibits cell proliferation, invasion, and migration, induces apoptosis, and causes cell cycle arrest. Overexpression of Tpd52l2 reverses the effects of miR-217 overexpression. The miR-217/Tpd52l2 axis suppresses PIK3CA/AKT signaling.","method":"miRNA mimic transfection, siRNA knockdown, overexpression rescue, luciferase reporter assay, cell cycle/apoptosis FACS, Western blot for PI3K/AKT pathway components","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct target validation, rescue experiment, and pathway placement","pmids":["29039566"],"is_preprint":false},{"year":2017,"finding":"TPD52L2 (TPD54) overexpression promotes terminal differentiation of chondrocytes: TPD54 overexpression enhances alkaline phosphatase activity, Ca2+ deposition, and expression of type X collagen and ALPase genes in ATDC5 cells, while knockdown reduces these markers. This is opposite to the effect of TPD52, which inhibits differentiation.","method":"Overexpression and siRNA knockdown in ATDC5 chondrocyte cell line, ALPase activity assay, Ca2+ deposition assay, gene expression analysis","journal":"BioMed research international","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD/OE with defined differentiation phenotypic readouts","pmids":["28798933"],"is_preprint":false},{"year":2017,"finding":"TPD52L2 (TPD54) overexpression decreases anchorage-independent colony formation and cell migration in OSCC-derived cells in vitro and attenuates tumor growth in vivo in xenograft models; knockdown of TPD54 enhances anchorage-independent growth, while co-expression of TPD52 in TPD54 knockdown cells further increases colony size.","method":"Overexpression and siRNA knockdown, colony formation assay, migration/invasion assay, nude mouse xenograft","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD/OE with multiple functional readouts and in vivo validation","pmids":["28339026"],"is_preprint":false},{"year":2015,"finding":"TPD52L2 knockdown in SMMC-7721 liver cancer cells inhibits proliferation and colony-forming ability, and causes cell cycle arrest in G0/G1 phase.","method":"Lentivirus-mediated RNA interference, cell proliferation assay, colony formation assay, FACS cell cycle analysis","journal":"International journal of clinical and experimental medicine","confidence":"Low","confidence_rationale":"Tier 3 — single lab, single knockdown approach with phenotypic but limited mechanistic detail","pmids":["25932170"],"is_preprint":false},{"year":2022,"finding":"TPD52L2 knockdown in oxaliplatin-resistant gastric carcinoma cells induces apoptosis associated with endoplasmic reticulum (ER) stress, as shown by elevation of ER stress-associated proteins (PERK, GRP78, CHOP, IRE1α) and increased PARP and caspase-3 cleavage.","method":"siRNA knockdown, Western blot for ER stress markers and apoptosis markers, cell viability assay, colony formation assay","journal":"Evidence-based complementary and alternative medicine","confidence":"Low","confidence_rationale":"Tier 3 — single lab, single method with phenotypic pathway association but no direct mechanistic link","pmids":["35087592"],"is_preprint":false},{"year":2025,"finding":"TPD52L2 knockdown in gastric cancer cell lines (AGS and MKN45) inhibits proliferation, migration, induces G0/G1 arrest and apoptosis, and suppresses PI3K/AKT/mTOR signaling and EMT marker expression.","method":"Lentivirus-mediated gene knockdown, cell proliferation/migration/invasion/apoptosis assays, Western blot for PI3K/AKT/mTOR and EMT markers","journal":"Briefings in functional genomics","confidence":"Low","confidence_rationale":"Tier 3 — single study, phenotypic KD with pathway association but no direct mechanistic dissection","pmids":["40973691"],"is_preprint":false},{"year":2023,"finding":"A novel TPD52L2-ROS1 gene fusion was identified in an ALK-negative inflammatory myofibroblastic tumor (IMT), with fusion of TPD52L2 exons 1-4 to ROS1 exons 36-43, and the patient responded to Crizotinib treatment.","method":"RNA-based next-generation sequencing (NGS), immunohistochemistry","journal":"Diagnostic pathology","confidence":"Low","confidence_rationale":"Tier 3 — single case report with NGS fusion identification; no functional mechanistic dissection of the fusion protein","pmids":["37735390"],"is_preprint":false}],"current_model":"TPD52L2 (TPD54) is an abundant cytosolic protein that defines a class of ~30 nm intracellular nanovesicles (INVs) involved in multiple membrane trafficking pathways (anterograde traffic, recycling, Golgi integrity), binding to these vesicles via amphipathic helices including an ALPS motif that senses membrane curvature; it also localizes to mitochondria where it stabilizes pyruvate dehydrogenase E1α by blocking PDK1-mediated phosphorylation, and in various cancer cell contexts suppresses EMT/invasion via β-catenin/Snail signaling and regulates cell attachment through talin1-dependent integrin inside-out signaling."},"narrative":{"teleology":[{"year":2013,"claim":"Establishing that TPD54 negatively regulates cell attachment and migration revealed a cell-biological function beyond its identity as a tumor protein D52 family member, placing it upstream of talin1/integrin and Akt signaling.","evidence":"siRNA knockdown and overexpression in oral squamous cell carcinoma cells with migration, attachment, and signaling readouts","pmids":["23529586"],"confidence":"Medium","gaps":["Mechanism by which TPD54 controls talin1-dependent integrin activation is unknown","Whether the integrin-regulatory role is direct or mediated through vesicle trafficking was not tested"]},{"year":2013,"claim":"Identification of hABCF3 as a physical interaction partner provided a first direct binding partner for TPD52L2, though functional significance remained limited to proliferation effects of truncated hABCF3.","evidence":"Yeast two-hybrid screen, reciprocal co-immunoprecipitation, domain mapping, proliferation assays","pmids":["24052230"],"confidence":"Medium","gaps":["Endogenous relevance of the TPD52L2–hABCF3 interaction was not validated","No link established between this interaction and vesicle trafficking or any other core TPD54 function"]},{"year":2017,"claim":"Multiple studies converged on TPD54 as a suppressor of cancer cell proliferation, migration, and invasion across glioma, pancreatic, and oral cancer models, with pathway placement on β-catenin/Snail EMT and PI3K/AKT signaling, and identification as a direct target of miR-485-5p and miR-217.","evidence":"Knockdown/overexpression, luciferase reporter assays for miRNA targeting, invasion/migration assays, xenograft models, Western blot for EMT and PI3K/AKT markers","pmids":["29106517","28804551","29039566","28339026"],"confidence":"Medium","gaps":["Whether anti-invasive effects are mechanistically linked to TPD54's vesicle trafficking function was not tested","Relative contributions of β-catenin/Snail versus PI3K/AKT pathways to TPD54-dependent phenotypes are unresolved","miRNA regulation studies used cancer cell lines and generalizability is unclear"]},{"year":2017,"claim":"Demonstrating that TPD54 promotes terminal chondrocyte differentiation—opposite to the effect of the paralog TPD52—revealed a developmental biology role and functional divergence within the D52 family.","evidence":"Overexpression and knockdown in ATDC5 chondrocyte cell line with alkaline phosphatase activity, Ca²⁺ deposition, and differentiation marker analysis","pmids":["28798933"],"confidence":"Medium","gaps":["Molecular mechanism by which TPD54 drives chondrocyte differentiation is unknown","No in vivo skeletal phenotype data"]},{"year":2019,"claim":"Discovery that TPD54 localizes to mitochondria and directly stabilizes PDH E1α by blocking PDK1-mediated phosphorylation established a non-vesicular metabolic function, linking TPD54 to mitochondrial respiration and ROS homeostasis.","evidence":"IP-MS identification of PDH E1α interaction, site-directed mutagenesis of Ser232, mitochondrial localization by immunofluorescence, oxygen consumption and ROS measurements in breast cancer cells","pmids":["30697423"],"confidence":"High","gaps":["Structural basis of TPD54–PDH E1α interaction is not resolved","Whether the mitochondrial pool of TPD54 is distinct from the vesicle-associated pool is unknown","Relevance of PDH stabilization in non-cancer cell types has not been examined"]},{"year":2020,"claim":"The landmark discovery that TPD54 defines a novel class of ~30 nm intracellular nanovesicles (INVs) fundamentally reframed the protein as a vesicle organizer rather than merely a tumor-associated protein, showing INVs carry specific cargo, R-SNAREs, and 16 Rab GTPases for multiple trafficking routes.","evidence":"Inducible mitochondrial rerouting assay capturing INVs, super-resolution imaging, co-immunoprecipitation, vesicle cargo/SNARE/Rab profiling in HeLa cells","pmids":["31672706"],"confidence":"High","gaps":["Biogenesis mechanism of INVs is unknown","Specific cargo selectivity rules for INV loading are not defined","Whether INVs are a universal trafficking intermediate or cell-type restricted is unclear"]},{"year":2022,"claim":"Determining that TPD54 binds INV membranes through amphipathic helices AH2 and AH3—with AH3 functioning as a curvature-sensing ALPS motif—provided the biophysical mechanism for selective association with highly curved nanovesicles.","evidence":"Limited proteolysis, CD spectroscopy, tryptophan fluorescence, cysteine mutagenesis with environment-sensitive probes, liposome binding assays with varied curvature and lipid composition","pmids":["35714773"],"confidence":"High","gaps":["How AH-mediated curvature sensing coordinates with Rab and SNARE recruitment is unknown","No high-resolution structure of full-length TPD54 on membranes","Contribution of individual helices in vivo has not been dissected by knock-in mutations"]},{"year":null,"claim":"Major open questions include how INV biogenesis occurs, what determines cargo selectivity, how the vesicle-associated and mitochondrial pools of TPD54 are regulated relative to each other, and whether INV-mediated trafficking mechanistically underlies TPD54's roles in cell migration, EMT suppression, and differentiation.","evidence":"","pmids":[],"confidence":"High","gaps":["INV biogenesis pathway and budding machinery are uncharacterized","No structural model of full-length TPD54","Functional link between nanovesicle trafficking and anti-invasive/pro-differentiation phenotypes has not been tested directly"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[1]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2]}],"complexes":[],"partners":["PDHA1","PDK1","ABCF3","TLN1"],"other_free_text":[]},"mechanistic_narrative":"TPD52L2 (TPD54) is a cytosolic protein that functions as a key organizer of intracellular membrane trafficking and also participates in mitochondrial metabolic regulation. TPD54 defines a class of ~30 nm intracellular nanovesicles (INVs) that carry specific cargo, R-SNAREs, and multiple Rab GTPases, supporting anterograde transport, recycling, and Golgi integrity [PMID:31672706]; it binds these vesicles through amphipathic helices including an ALPS motif (AH3) that senses membrane curvature and lipid packing [PMID:35714773]. At mitochondria, TPD54 stabilizes pyruvate dehydrogenase E1α by blocking PDK1-mediated phosphorylation, thereby sustaining PDH activity, mitochondrial respiration, and ROS production [PMID:30697423]. In multiple cancer cell contexts, TPD54 suppresses cell migration, invasion, and anchorage-independent growth through β-catenin/Snail-mediated EMT and talin1-dependent integrin inside-out signaling pathways [PMID:29106517, PMID:23529586]."},"prefetch_data":{"uniprot":{"accession":"O43399","full_name":"Tumor protein D54","aliases":["Tumor protein D52-like 2"],"length_aa":206,"mass_kda":22.2,"function":"","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/O43399/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TPD52L2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PIP4P1","stoichiometry":0.2},{"gene":"SAR1B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TPD52L2","total_profiled":1310},"omim":[{"mim_id":"617567","title":"TUMOR PROTEIN D52-LIKE 3; TPD52L3","url":"https://www.omim.org/entry/617567"},{"mim_id":"609684","title":"MAL PROTEOLIPID PROTEIN 2; MAL2","url":"https://www.omim.org/entry/609684"},{"mim_id":"603747","title":"TUMOR PROTEIN D52-LIKE 2; TPD52L2","url":"https://www.omim.org/entry/603747"},{"mim_id":"603619","title":"FIZZY AND CELL DIVISION CYCLE 20-RELATED PROTEIN 1; FZR1","url":"https://www.omim.org/entry/603619"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TPD52L2"},"hgnc":{"alias_symbol":["D54","hD54","TPD54"],"prev_symbol":[]},"alphafold":{"accession":"O43399","domains":[{"cath_id":"1.20.890","chopping":"46-85","consensus_level":"medium","plddt":91.053,"start":46,"end":85},{"cath_id":"1.10.12","chopping":"128-174","consensus_level":"medium","plddt":72.123,"start":128,"end":174}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43399","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43399-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43399-F1-predicted_aligned_error_v6.png","plddt_mean":68.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TPD52L2","jax_strain_url":"https://www.jax.org/strain/search?query=TPD52L2"},"sequence":{"accession":"O43399","fasta_url":"https://rest.uniprot.org/uniprotkb/O43399.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43399/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43399"}},"corpus_meta":[{"pmid":"18008187","id":"PMC_18008187","title":"Progesterone effects on cell growth of U373 and D54 human astrocytoma cell lines.","date":"2007","source":"Endocrine","url":"https://pubmed.ncbi.nlm.nih.gov/18008187","citation_count":62,"is_preprint":false},{"pmid":"2172302","id":"PMC_2172302","title":"Tumor necrosis factor production and receptor expression by a human malignant glioma cell line, D54-MG.","date":"1990","source":"Journal of neuroimmunology","url":"https://pubmed.ncbi.nlm.nih.gov/2172302","citation_count":61,"is_preprint":false},{"pmid":"6687692","id":"PMC_6687692","title":"Interaction of dipalmitoylphosphatidylcholine and dimyristoylphosphatidylcholine-d54 mixtures with glycophorin. 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intracellular transport vesicles termed intracellular nanovesicles (INVs) of ~30 nm diameter, and is involved in multiple membrane trafficking pathways including anterograde traffic, recycling, and Golgi integrity. Rerouting TPD54 to mitochondria captured small vesicles at the mitochondrial surface; INVs contain specific cargo, R-SNAREs for fusion, and 16 out of 43 tested Rab GTPases.\",\n      \"method\": \"Inducible mitochondrial rerouting assay, super-resolution imaging, co-immunoprecipitation, vesicle capture and cargo/SNARE/Rab profiling\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (live imaging, rerouting, super-resolution, proteomics) in a single rigorous study\",\n      \"pmids\": [\"31672706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TPD52L2 (TPD54) binds intracellular nanovesicles via an extended amphipathic helix region; AH2 and AH3 helices are predominant for membrane binding in cells and in vitro. AH3 functions as an amphipathic lipid packing sensor (ALPS) motif enabling curvature-dependent membrane binding, and TPD54 binding to liposomes is sensitive to membrane curvature and lipid unsaturation.\",\n      \"method\": \"Limited proteolysis, CD spectroscopy, tryptophan fluorescence, cysteine mutagenesis with membrane-sensitive probe, site-directed mutagenesis, liposome binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis and multiple biophysical methods in a single study\",\n      \"pmids\": [\"35714773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TPD52L2 (TPD54) localizes to mitochondria and binds to pyruvate dehydrogenase E1α, stabilizing it by blocking PDK1-mediated serine 232 phosphorylation. TPD54 knockdown increases PDH E1α protein degradation, decreases PDH enzyme activity, reduces mitochondrial oxygen consumption and ROS production, contributing to metformin resistance in breast cancer cells.\",\n      \"method\": \"Immunoprecipitation followed by mass spectrometry, Western blot, site-directed mutagenesis, cell viability assays, ROS measurement, mitochondrial localization by immunofluorescence\",\n      \"journal\": \"Cancer & metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — IP-MS binding identification plus mutagenesis and functional enzymatic readout in one study\",\n      \"pmids\": [\"30697423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TPD52L2 (TPD54) is a negative regulator of ECM-dependent migration and cell attachment in oral squamous cell carcinoma cells. TPD54 knockdown increases anchorage-independent growth, ECM-dependent migration, and cell attachment, and activates Akt even without serum; these effects are mediated by talin1-dependent inside-out integrin signaling.\",\n      \"method\": \"siRNA knockdown, exogenous overexpression of splice variants, migration and attachment assays, Western blot for integrin subunits, talin1, E-cadherin, and Akt activation\",\n      \"journal\": \"Cellular oncology (Dordrecht, Netherlands)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD/OE with defined cellular phenotype and partial pathway placement via talin1/Akt\",\n      \"pmids\": [\"23529586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TPD52L2 interacts with hABCF3 (an ATP-binding cassette protein); this interaction was identified by yeast two-hybrid and confirmed by co-immunoprecipitation and co-localization. The interaction domain was mapped to the first 200 amino acids of hABCF3, and a truncated hABCF3 lacking this region impairs hABCF3-mediated cell proliferation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, co-localization by immunofluorescence, truncation mutagenesis, proliferation assays\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — reciprocal Co-IP and domain mapping with functional consequence\",\n      \"pmids\": [\"24052230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TPD52L2 regulates glioblastoma cell invasion through the CTNNB1/β-catenin and SNAI1/Snail-mediated epithelial-mesenchymal transition (EMT) pathway. Downregulation of TPD52L2 enhances cell invasion via upregulation of this pathway, while overexpression reverses invasion and reduces proliferation sensitivity to temozolomide.\",\n      \"method\": \"Proteomics analysis, siRNA knockdown, overexpression, invasion assays in vitro and in vivo, Western blot for β-catenin and Snail\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD/OE with pathway placement via proteomics and western blot, in vivo validation\",\n      \"pmids\": [\"29106517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TPD52L2 is a direct target of miR-485-5p in glioma; miR-485-5p overexpression reduces TPD52L2 expression and inhibits glioma cell proliferation, migration, and invasion in vitro and in vivo.\",\n      \"method\": \"Luciferase reporter assay (implied as direct target), miRNA overexpression, siRNA knockdown, cell proliferation/migration/invasion assays, xenograft in vivo model\",\n      \"journal\": \"American journal of translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct target validation with functional rescue experiments in vitro and in vivo\",\n      \"pmids\": [\"28804551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TPD52L2 (Tpd52l2) is a direct target of miR-217 in pancreatic adenocarcinoma; knockdown of Tpd52l2 inhibits cell proliferation, invasion, and migration, induces apoptosis, and causes cell cycle arrest. Overexpression of Tpd52l2 reverses the effects of miR-217 overexpression. The miR-217/Tpd52l2 axis suppresses PIK3CA/AKT signaling.\",\n      \"method\": \"miRNA mimic transfection, siRNA knockdown, overexpression rescue, luciferase reporter assay, cell cycle/apoptosis FACS, Western blot for PI3K/AKT pathway components\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct target validation, rescue experiment, and pathway placement\",\n      \"pmids\": [\"29039566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TPD52L2 (TPD54) overexpression promotes terminal differentiation of chondrocytes: TPD54 overexpression enhances alkaline phosphatase activity, Ca2+ deposition, and expression of type X collagen and ALPase genes in ATDC5 cells, while knockdown reduces these markers. This is opposite to the effect of TPD52, which inhibits differentiation.\",\n      \"method\": \"Overexpression and siRNA knockdown in ATDC5 chondrocyte cell line, ALPase activity assay, Ca2+ deposition assay, gene expression analysis\",\n      \"journal\": \"BioMed research international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD/OE with defined differentiation phenotypic readouts\",\n      \"pmids\": [\"28798933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TPD52L2 (TPD54) overexpression decreases anchorage-independent colony formation and cell migration in OSCC-derived cells in vitro and attenuates tumor growth in vivo in xenograft models; knockdown of TPD54 enhances anchorage-independent growth, while co-expression of TPD52 in TPD54 knockdown cells further increases colony size.\",\n      \"method\": \"Overexpression and siRNA knockdown, colony formation assay, migration/invasion assay, nude mouse xenograft\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD/OE with multiple functional readouts and in vivo validation\",\n      \"pmids\": [\"28339026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TPD52L2 knockdown in SMMC-7721 liver cancer cells inhibits proliferation and colony-forming ability, and causes cell cycle arrest in G0/G1 phase.\",\n      \"method\": \"Lentivirus-mediated RNA interference, cell proliferation assay, colony formation assay, FACS cell cycle analysis\",\n      \"journal\": \"International journal of clinical and experimental medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single knockdown approach with phenotypic but limited mechanistic detail\",\n      \"pmids\": [\"25932170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TPD52L2 knockdown in oxaliplatin-resistant gastric carcinoma cells induces apoptosis associated with endoplasmic reticulum (ER) stress, as shown by elevation of ER stress-associated proteins (PERK, GRP78, CHOP, IRE1α) and increased PARP and caspase-3 cleavage.\",\n      \"method\": \"siRNA knockdown, Western blot for ER stress markers and apoptosis markers, cell viability assay, colony formation assay\",\n      \"journal\": \"Evidence-based complementary and alternative medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single method with phenotypic pathway association but no direct mechanistic link\",\n      \"pmids\": [\"35087592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TPD52L2 knockdown in gastric cancer cell lines (AGS and MKN45) inhibits proliferation, migration, induces G0/G1 arrest and apoptosis, and suppresses PI3K/AKT/mTOR signaling and EMT marker expression.\",\n      \"method\": \"Lentivirus-mediated gene knockdown, cell proliferation/migration/invasion/apoptosis assays, Western blot for PI3K/AKT/mTOR and EMT markers\",\n      \"journal\": \"Briefings in functional genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single study, phenotypic KD with pathway association but no direct mechanistic dissection\",\n      \"pmids\": [\"40973691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A novel TPD52L2-ROS1 gene fusion was identified in an ALK-negative inflammatory myofibroblastic tumor (IMT), with fusion of TPD52L2 exons 1-4 to ROS1 exons 36-43, and the patient responded to Crizotinib treatment.\",\n      \"method\": \"RNA-based next-generation sequencing (NGS), immunohistochemistry\",\n      \"journal\": \"Diagnostic pathology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single case report with NGS fusion identification; no functional mechanistic dissection of the fusion protein\",\n      \"pmids\": [\"37735390\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TPD52L2 (TPD54) is an abundant cytosolic protein that defines a class of ~30 nm intracellular nanovesicles (INVs) involved in multiple membrane trafficking pathways (anterograde traffic, recycling, Golgi integrity), binding to these vesicles via amphipathic helices including an ALPS motif that senses membrane curvature; it also localizes to mitochondria where it stabilizes pyruvate dehydrogenase E1α by blocking PDK1-mediated phosphorylation, and in various cancer cell contexts suppresses EMT/invasion via β-catenin/Snail signaling and regulates cell attachment through talin1-dependent integrin inside-out signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TPD52L2 (TPD54) is a cytosolic protein that functions as a key organizer of intracellular membrane trafficking and also participates in mitochondrial metabolic regulation. TPD54 defines a class of ~30 nm intracellular nanovesicles (INVs) that carry specific cargo, R-SNAREs, and multiple Rab GTPases, supporting anterograde transport, recycling, and Golgi integrity [PMID:31672706]; it binds these vesicles through amphipathic helices including an ALPS motif (AH3) that senses membrane curvature and lipid packing [PMID:35714773]. At mitochondria, TPD54 stabilizes pyruvate dehydrogenase E1α by blocking PDK1-mediated phosphorylation, thereby sustaining PDH activity, mitochondrial respiration, and ROS production [PMID:30697423]. In multiple cancer cell contexts, TPD54 suppresses cell migration, invasion, and anchorage-independent growth through β-catenin/Snail-mediated EMT and talin1-dependent integrin inside-out signaling pathways [PMID:29106517, PMID:23529586].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing that TPD54 negatively regulates cell attachment and migration revealed a cell-biological function beyond its identity as a tumor protein D52 family member, placing it upstream of talin1/integrin and Akt signaling.\",\n      \"evidence\": \"siRNA knockdown and overexpression in oral squamous cell carcinoma cells with migration, attachment, and signaling readouts\",\n      \"pmids\": [\"23529586\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which TPD54 controls talin1-dependent integrin activation is unknown\",\n        \"Whether the integrin-regulatory role is direct or mediated through vesicle trafficking was not tested\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of hABCF3 as a physical interaction partner provided a first direct binding partner for TPD52L2, though functional significance remained limited to proliferation effects of truncated hABCF3.\",\n      \"evidence\": \"Yeast two-hybrid screen, reciprocal co-immunoprecipitation, domain mapping, proliferation assays\",\n      \"pmids\": [\"24052230\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Endogenous relevance of the TPD52L2–hABCF3 interaction was not validated\",\n        \"No link established between this interaction and vesicle trafficking or any other core TPD54 function\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Multiple studies converged on TPD54 as a suppressor of cancer cell proliferation, migration, and invasion across glioma, pancreatic, and oral cancer models, with pathway placement on β-catenin/Snail EMT and PI3K/AKT signaling, and identification as a direct target of miR-485-5p and miR-217.\",\n      \"evidence\": \"Knockdown/overexpression, luciferase reporter assays for miRNA targeting, invasion/migration assays, xenograft models, Western blot for EMT and PI3K/AKT markers\",\n      \"pmids\": [\"29106517\", \"28804551\", \"29039566\", \"28339026\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether anti-invasive effects are mechanistically linked to TPD54's vesicle trafficking function was not tested\",\n        \"Relative contributions of β-catenin/Snail versus PI3K/AKT pathways to TPD54-dependent phenotypes are unresolved\",\n        \"miRNA regulation studies used cancer cell lines and generalizability is unclear\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that TPD54 promotes terminal chondrocyte differentiation—opposite to the effect of the paralog TPD52—revealed a developmental biology role and functional divergence within the D52 family.\",\n      \"evidence\": \"Overexpression and knockdown in ATDC5 chondrocyte cell line with alkaline phosphatase activity, Ca²⁺ deposition, and differentiation marker analysis\",\n      \"pmids\": [\"28798933\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Molecular mechanism by which TPD54 drives chondrocyte differentiation is unknown\",\n        \"No in vivo skeletal phenotype data\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovery that TPD54 localizes to mitochondria and directly stabilizes PDH E1α by blocking PDK1-mediated phosphorylation established a non-vesicular metabolic function, linking TPD54 to mitochondrial respiration and ROS homeostasis.\",\n      \"evidence\": \"IP-MS identification of PDH E1α interaction, site-directed mutagenesis of Ser232, mitochondrial localization by immunofluorescence, oxygen consumption and ROS measurements in breast cancer cells\",\n      \"pmids\": [\"30697423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of TPD54–PDH E1α interaction is not resolved\",\n        \"Whether the mitochondrial pool of TPD54 is distinct from the vesicle-associated pool is unknown\",\n        \"Relevance of PDH stabilization in non-cancer cell types has not been examined\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The landmark discovery that TPD54 defines a novel class of ~30 nm intracellular nanovesicles (INVs) fundamentally reframed the protein as a vesicle organizer rather than merely a tumor-associated protein, showing INVs carry specific cargo, R-SNAREs, and 16 Rab GTPases for multiple trafficking routes.\",\n      \"evidence\": \"Inducible mitochondrial rerouting assay capturing INVs, super-resolution imaging, co-immunoprecipitation, vesicle cargo/SNARE/Rab profiling in HeLa cells\",\n      \"pmids\": [\"31672706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Biogenesis mechanism of INVs is unknown\",\n        \"Specific cargo selectivity rules for INV loading are not defined\",\n        \"Whether INVs are a universal trafficking intermediate or cell-type restricted is unclear\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Determining that TPD54 binds INV membranes through amphipathic helices AH2 and AH3—with AH3 functioning as a curvature-sensing ALPS motif—provided the biophysical mechanism for selective association with highly curved nanovesicles.\",\n      \"evidence\": \"Limited proteolysis, CD spectroscopy, tryptophan fluorescence, cysteine mutagenesis with environment-sensitive probes, liposome binding assays with varied curvature and lipid composition\",\n      \"pmids\": [\"35714773\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How AH-mediated curvature sensing coordinates with Rab and SNARE recruitment is unknown\",\n        \"No high-resolution structure of full-length TPD54 on membranes\",\n        \"Contribution of individual helices in vivo has not been dissected by knock-in mutations\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions include how INV biogenesis occurs, what determines cargo selectivity, how the vesicle-associated and mitochondrial pools of TPD54 are regulated relative to each other, and whether INV-mediated trafficking mechanistically underlies TPD54's roles in cell migration, EMT suppression, and differentiation.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"INV biogenesis pathway and budding machinery are uncharacterized\",\n        \"No structural model of full-length TPD54\",\n        \"Functional link between nanovesicle trafficking and anti-invasive/pro-differentiation phenotypes has not been tested directly\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PDHA1\",\n      \"PDK1\",\n      \"ABCF3\",\n      \"TLN1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}