{"gene":"MIA3","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2009,"finding":"TANGO1 (MIA3) is an integral membrane protein localized to ER exit sites with a luminal SH3 domain that binds collagen VII cargo and a cytoplasmic proline-rich domain (PRD) that binds COPII coat subunits Sec23/24, positioning it to load bulky collagen VII into growing COPII carriers while itself remaining excluded from the budding vesicle.","method":"Genome-wide screen, subcellular fractionation/localization, domain binding assays (SH3-collagen VII interaction, PRD-Sec23/24 interaction), siRNA knockdown with collagen secretion readout","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays for two distinct domains, localization by direct imaging, functional KD with specific cargo secretion readout, foundational study replicated extensively","pmids":["19269366"],"is_preprint":false},{"year":2011,"finding":"Mia3/TANGO1 knockout mice show defective secretion of numerous collagens (I, II, III, IV, VII, IX) from multiple cell types (chondrocytes, fibroblasts, endothelial cells), intracellular collagen accumulation, unfolded protein response induction, impaired chondrocyte maturation and bone mineralization, dwarfism, and neonatal lethality, establishing that Mia3 is broadly required for efficient secretion of all collagen molecules.","method":"Knockout mouse model, immunofluorescence, Western blot, collagen secretion assays from primary cells, histology, skeletal phenotyping","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple orthogonal readouts across cell types and collagens, in vivo phenotype","pmids":["21606205"],"is_preprint":false},{"year":2011,"finding":"cTAGE5 forms a complex with TANGO1 at ER exit sites through coiled-coil domain interactions; both proteins interact with COPII Sec23/24 via their C-terminal proline-rich domains and are both required for collagen VII secretion, with cTAGE5 acting as a co-receptor of TANGO1.","method":"Co-immunoprecipitation, localization (confocal microscopy), domain mapping, siRNA knockdown with collagen secretion assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, domain-level interaction mapping, functional KD, replicated in multiple subsequent studies","pmids":["21525241"],"is_preprint":false},{"year":2015,"finding":"TANGO1 recruits YKT6-containing ERGIC membranes to procollagen VII-enriched ER exit site patches; the full complement of SNAREs required for this ERGIC membrane fusion includes t-SNAREs Syntaxin 18, BNIP1, and USE1, and v-SNARE YKT6. The first coiled-coil domain (residues 1214–1396) of TANGO1 is sufficient to recruit ERGIC membranes even when artificially retargeted to mitochondria.","method":"siRNA knockdown, domain-targeting experiments (mitochondrial retargeting), live imaging, SNARE identification","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-level functional rescue experiment (mitochondrial retargeting), identification of complete SNARE set, multiple orthogonal methods","pmids":["26568311"],"is_preprint":false},{"year":2016,"finding":"TANGO1 assembles into a ring at ER exit sites organized by radial interactions with COPII and lateral interactions with cTAGE5, TANGO1-short, or itself; TANGO1 recruits ERGIC membranes for collagen export via the NRZ (NBAS/RINT1/ZW10) tether complex, thereby coupling retrograde membrane flow to anterograde cargo transport. Without the NRZ complex, the TANGO1 ring does not assemble.","method":"Super-resolution microscopy, Co-IP, siRNA knockdown, domain interaction assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (imaging, Co-IP, KD), identification of NRZ as essential ring-nucleating partner","pmids":["29513218"],"is_preprint":false},{"year":2016,"finding":"X-ray crystallography and biochemical analysis showed that TANGO1 and cTAGE5 proline-rich domains (PRDs) bind Sec23 via repeated PPP motifs, enabling a single TANGO1/cTAGE5 receptor to bind multiple copies of COPII inner coat protein in a close-packed array, promoting accretion of inner coat proteins into a helical lattice for large COPII carrier formation.","method":"X-ray crystallography, biochemical binding assays (ITC/pulldown), mutagenesis of PPP motifs","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with biochemical validation and mutagenesis, mechanistically resolves PRD-Sec23 interaction at atomic level","pmids":["27551091"],"is_preprint":false},{"year":2016,"finding":"TANGO1 and TALI (a chimeric MIA2/cTAGE5 protein) together bind ApoB and are both required for recruitment of ApoB-containing lipid particles (pre-chylomicrons and pre-VLDLs) to ER exit sites and their export; procollagen XII export by the same cells requires only TANGO1, not TALI, indicating cargo-specific co-receptor requirements.","method":"Co-IP (TANGO1-TALI interaction; both with ApoB), siRNA knockdown, secretion assays (ApoB, procollagen XII)","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP for multiple partners, parallel siRNA knockdowns with cargo-specific secretion readouts distinguishing TANGO1 vs. TALI requirements","pmids":["27138255"],"is_preprint":false},{"year":2016,"finding":"TANGO1 exists in two stable macromolecular complexes at ER exit sites: TANGO1L/cTAGE5/Sec12 (~900 kDa) and TANGO1S/cTAGE5/Sec12 (~700 kDa); TANGO1S lacks the luminal collagen-binding domain but is independently required for collagen export from the ER. The two isoforms are interchangeable for collagen export.","method":"Native gel electrophoresis, gel filtration, siRNA knockdown of individual isoforms, collagen secretion assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical complex characterization plus functional KD, single lab, two orthogonal methods","pmids":["27413011"],"is_preprint":false},{"year":2016,"finding":"The unfolded protein response (UPR) upregulates TANGO1 expression in hepatic stellate cells (HSCs) in response to TGFβ; this is mediated by the transcription factor XBP1. Depletion of TANGO1 in HSCs blocks collagen I secretion, causes procollagen I retention in the ER, induces the UPR, and leads to HSC apoptosis. TANGO1+/- mice show reduced hepatic fibrosis in CCl4 and bile duct ligation models.","method":"siRNA screen, siRNA knockdown, collagen secretion assay, UPR reporter assays, XBP1 ChIP/overexpression, heterozygous KO mouse models","journal":"Hepatology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KD, KO mouse, transcription factor identification), in vivo fibrosis models corroborating in vitro mechanism","pmids":["28039913"],"is_preprint":false},{"year":2017,"finding":"TANGO1 directly interacts with Sec16, and this interaction is required for correct localization of TANGO1 isoforms and for organization of ER exit sites; depletion of TANGO1 disassembles COPII components and membrane-bound ER-resident complexes, reducing functional ER exit sites and delaying secretion. Ectopic expression of the TANGO1 C-terminal Sec16-binding domain in mitochondria recruits Sec16 and other COPII components. TANGO1 also recruits cTAGE5/Sec12-containing macromolecular complexes to ER exit sites.","method":"Co-IP (TANGO1-Sec16 interaction), mitochondrial retargeting assay, siRNA knockdown, confocal microscopy, secretion assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with domain-level rescue (mitochondrial retargeting), multiple functional readouts, replicated by independent labs","pmids":["28442536"],"is_preprint":false},{"year":2017,"finding":"In Drosophila, Tango1 (the only MIA/cTAGE family member in flies) forms rings that hold COPII carriers and Golgi in close proximity at ER exit sites; loss of Tango1 reduces ERES size, causes ERES-Golgi uncoupling, and impairs secretion of collagen and all other tested cargoes. Overexpression of Tango1 creates more and larger ERESs, supporting an organizer role.","method":"Genetic loss-of-function (Drosophila mutants), live imaging, immunofluorescence, secretion assays for multiple cargo types","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Drosophila ortholog, clean genetic KO, multiple cargo readouts, gain-of-function corroboration","pmids":["28280122"],"is_preprint":false},{"year":2017,"finding":"In Drosophila, loss of Tango1 causes ER stress and defects in cell shape secondary to retention of bulky cargo (e.g., Dumpy); removal of bulky cargo from cells restores secretion of non-bulky proteins, cell morphology, and attenuates ER stress. However, ER/Golgi morphological defects persist in the absence of bulky cargo, establishing a secretion-independent role for Tango1 in ER/Golgi architecture maintenance.","method":"Drosophila genetic loss-of-function, double-mutant epistasis (removing bulky cargo in Tango1-depleted cells), confocal imaging, ER stress assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double-mutant rescue distinguishing primary from secondary phenotypes, Drosophila ortholog with clear mechanistic logic","pmids":["29138315"],"is_preprint":false},{"year":2018,"finding":"TANGO1 is co-packaged with procollagen I (PC1), cTAGE5, and SEC12 into large COPII-coated carriers; TANGO1 is retrieved back to the ER by COPI via the C-terminal RDEL retrieval sequence of HSP47. SEC12, normally excluded from small COPII vesicles, is enriched around ER membranes and large COPII carriers containing PC1; a split-GFP system reconstituting TANGO1 luminal domain targeting of SEC12 to PC1 was sufficient to generate large PC1 carriers.","method":"Live-cell imaging, subcellular fractionation, split-GFP reconstitution assay, immunofluorescence, siRNA knockdown","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution (split-GFP system), direct imaging of cargo co-packaging, fractionation; multiple orthogonal methods","pmids":["30545919"],"is_preprint":false},{"year":2019,"finding":"In Drosophila salivary glands, Tango1 forms ring-like structures that mediate formation of COPII rings (not vesicles); these COPII rings act as docking sites for the cis-Golgi, and secretory mucins emerge from the Golgi side of the Tango1-COPII-Golgi complexes. Loss of Tango1 disrupts COPII ring formation, COPII-cis-Golgi association, mucin O-glycosylation, and secretory granule biogenesis. A Tango1 self-association domain essential for ring formation was identified.","method":"High-resolution fluorescence imaging (Drosophila larval salivary glands), genetic KO, domain mapping (self-association domain identification)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — high-resolution imaging with KO, domain identification, single lab","pmids":["31690624"],"is_preprint":false},{"year":2020,"finding":"Theoretical/biophysical modeling shows that the TANGO1 ring acts as a linactant to stabilize the open neck of a nascent COPII bud; elongation into a procollagen-sized transport intermediate is facilitated by relief of membrane tension (via TANGO1-mediated ERGIC membrane fusion) and force application. The two TANGO1 membrane helices (TM spanning helix and IM inner-leaflet helix) together reduce lipid diffusion at curved membrane regions (reconstituted in model membranes), suggesting a mechanism to prevent membrane mixing during collagen export.","method":"Theoretical biophysical modeling; lipid diffusion barrier reconstitution in model membranes (GUVs/supported bilayers) with TANGO1 membrane helices","journal":"eLife / eLife","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro membrane reconstitution for lipid diffusion barrier (single lab); theoretical model for bud elongation not experimentally validated independently","pmids":["33169667","32452385"],"is_preprint":false},{"year":2020,"finding":"TANGO1 phosphorylation is regulated by kinase CK1 (which phosphorylates TANGO1 and reduces its binding to Sec16, leading to ER exit site disassembly) and phosphatase PP1 (which dephosphorylates TANGO1). During mitosis, PP1-mediated dephosphorylation of TANGO1 decreases, resulting in net TANGO1 phosphorylation, Sec16 dissociation, and ER exit site disassembly.","method":"Phosphorylation assays, kinase/phosphatase inhibitor treatments, Co-IP (phospho-TANGO1 vs. Sec16), cell-cycle synchronization, confocal microscopy","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — identification of writer (CK1) and eraser (PP1) with functional consequence (Sec16 binding disruption and ERES disassembly), multiple methods","pmids":["32818468"],"is_preprint":false},{"year":2020,"finding":"Biallelic TANGO1 mutations in humans (synonymous substitution causing exon 8 skipping and truncated protein) cause a syndromal disease with dentinogenesis imperfecta, short stature, skeletal abnormalities, diabetes, hearing loss, and intellectual disability. The truncated TANGO1 protein is dispersed in the ER (not at ER exit sites) and its expression impairs cellular collagen I secretion in cells with endogenous intact TANGO1, indicating dominant-negative activity.","method":"Whole-exome sequencing, mRNA/protein analysis, subcellular localization by fluorescence microscopy, collagen I secretion assay in transfected HeLa/U2OS cells","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetics with functional validation (localization + secretion assay), dominant-negative mechanism established","pmids":["32101163"],"is_preprint":false},{"year":2021,"finding":"Loss of both TANGO1 isoforms (TANGO1S and TANGO1L) in human cells causes major defects in secretory pathway organization including failure to maintain ERGIC53 and SURF4 localization to the ER-Golgi intermediate compartment, dramatic ultrastructural changes at the ER-Golgi interface, and impaired secretion of all secretory cargo types (large and small). Loss of TANGO1L alone has limited impact on procollagen secretion and secretory pathway organization, indicating TANGO1S is the functionally dominant isoform.","method":"CRISPR genome engineering of isoform-specific knockouts, light microscopy, electron microscopy, secretion assays, proteomics, transcriptomics","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (EM ultrastructure, proteomics, secretion assays) in engineered human cells with isoform-specific KOs","pmids":["34350936"],"is_preprint":false},{"year":2014,"finding":"In Drosophila, the O-glycosyltransferase PGANT4 glycosylates Tango1 and protects it from furin (Dfur2)-mediated proteolytic cleavage; loss of PGANT4 results in Tango1 cleavage, loss of secretory granules, and disrupted apical secretion. Overexpression of Tango1 or knockdown of Dfur2 rescues the secretory defects caused by PGANT4 loss.","method":"Drosophila genetics, mass spectrometry (glycosylation identification), rescue experiments (Tango1 overexpression, Dfur2 knockdown), in vivo secretion assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — identification of PTM (O-glycosylation) and its functional consequence via genetic rescue, single lab","pmids":["24799692"],"is_preprint":false},{"year":2006,"finding":"TANGO (MIA3) protein expression is reduced or lost in melanoma cell lines and tumor samples; re-expression of TANGO reduces melanoma cell motility, while antisense-mediated loss of TANGO enhances migration, establishing TANGO as a tumor suppressor that negatively regulates cell migration.","method":"RT-PCR, immunohistochemistry, stable transfection (TANGO re-expression and antisense knockdown), migration/motility assays","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional assays with both gain and loss of function, but no molecular mechanism identified; single lab","pmids":["17044017"],"is_preprint":false},{"year":2007,"finding":"Recombinant TANGO (MIA3) protein interacts with the leukocyte integrin CD11c (αX/CD18) and reduces monocyte attachment to fibrinogen and ICAM-1 and to endothelial cells, while increasing the migration capacity of premonocytic cells. TANGO interaction with CD11c does not compete directly with ligand binding, suggesting modulation of integrin activity.","method":"Pulldown/affinity isolation of interacting proteins (mass spectrometry identification of CD11c), recombinant protein stimulation, attachment and migration functional assays","journal":"Journal of leukocyte biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pulldown identification of CD11c, functional assays with recombinant protein; mechanism of integrin modulation is proposed but not experimentally established","pmids":["17726152"],"is_preprint":false},{"year":2017,"finding":"ADTRP positively regulates MIA3/TANGO1 expression via a PIK3R3-AKT signaling axis in endothelial cells; knockdown of ADTRP downregulates MIA3/TANGO1, while constitutively active AKT1 or MIA3/TANGO1 overexpression rescues endothelial cell functions (monocyte adhesion, transendothelial migration, proliferation, apoptosis) impaired by ADTRP knockdown. MIA3/TANGO1 knockdown itself promotes monocyte adhesion and transendothelial migration.","method":"siRNA knockdown, Western blot, constitutively active AKT1 rescue, overexpression, monocyte adhesion and transendothelial migration assays","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis rescue experiments establishing pathway order, functional endothelial assays, single lab","pmids":["28341552"],"is_preprint":false}],"current_model":"TANGO1 (MIA3) is an integral ER exit site transmembrane protein that assembles into a ring by interacting radially with COPII coats (via PRD-Sec23 PPP-motif contacts) and laterally with cTAGE5, TANGO1-short, and itself; its luminal SH3-like domain captures bulky cargoes (procollagens, ApoB-lipoproteins), its cytoplasmic coiled-coil recruits ERGIC membranes via the NRZ tether and SNAREs to fuse retrograde membrane into the growing carrier neck, its membrane helices act as a lipid diffusion barrier preventing ER-ERGIC membrane mixing, and its phosphorylation by CK1 (counteracted by PP1) controls ER exit site disassembly during mitosis; collectively, TANGO1 acts as a master scaffold of the early secretory pathway, essential for the ER export of procollagens and other bulky cargoes and, in vertebrates, for general secretory pathway organization and function."},"narrative":{"mechanistic_narrative":"MIA3 (TANGO1) is an integral ER exit site transmembrane protein that acts as the master scaffold organizing the export of bulky secretory cargo from the endoplasmic reticulum [PMID:19269366, PMID:29513218]. It is structurally bifunctional: a luminal SH3-like domain captures cargoes including collagen VII, procollagens, and ApoB-lipoproteins, while its cytoplasmic proline-rich domain (PRD) binds the COPII inner coat subunit Sec23/24 through repeated PPP motifs, allowing a single receptor to nucleate accretion of multiple inner-coat copies into the helical lattice needed to build large carriers, with TANGO1 itself excluded from the budding vesicle [PMID:19269366, PMID:27551091]. At ER exit sites TANGO1 assembles into a ring through radial contacts with COPII and lateral self- and co-receptor interactions with cTAGE5 and the short isoform TANGO1S, and it anchors the export machinery via direct binding to Sec16, organizing functional ER exit sites and recruiting cTAGE5/Sec12 complexes [PMID:29513218, PMID:21525241, PMID:28442536]. Ring assembly couples anterograde cargo export to retrograde membrane flow: TANGO1's first coiled-coil recruits ERGIC membranes through the NRZ (NBAS/RINT1/ZW10) tether and a SNARE set (Syntaxin 18, BNIP1, USE1, YKT6), supplying membrane to elongate procollagen-sized carriers, and its membrane helices reduce lipid diffusion to act as a barrier preventing ER–ERGIC mixing [PMID:26568311, PMID:29513218, PMID:33169667, PMID:32452385]. Cargo selectivity is modular—ApoB-lipoprotein export additionally requires the TALI co-receptor whereas procollagen XII does not [PMID:27138255]—and ER exit site assembly is dynamically controlled by CK1 phosphorylation, which dissociates TANGO1 from Sec16 to drive disassembly during mitosis, counteracted by PP1 [PMID:32818468]. Loss of TANGO1 in mice causes broad collagen secretion failure, UPR induction, skeletal defects, and neonatal lethality, and in human cells disrupts secretory pathway organization at the ER-Golgi interface for cargo of all sizes [PMID:21606205, PMID:34350936]. Biallelic TANGO1 mutations cause a syndromal human disease with dentinogenesis imperfecta, short stature, skeletal abnormalities, diabetes, hearing loss, and intellectual disability, with the truncated protein dispersed from ER exit sites and acting dominant-negatively on collagen I secretion [PMID:32101163].","teleology":[{"year":2006,"claim":"Before its secretory role was known, MIA3 was characterized as a tumor suppressor controlling cell migration, establishing the first functional link for the gene.","evidence":"RT-PCR, IHC, gain/loss-of-function migration assays in melanoma cells","pmids":["17044017"],"confidence":"Medium","gaps":["No molecular mechanism connecting MIA3 to migration","Relationship to its later-defined secretory function not addressed"]},{"year":2007,"claim":"An early candidate partner (leukocyte integrin CD11c) was identified, framing MIA3 as a modulator of integrin-mediated adhesion before its ER role emerged.","evidence":"Affinity pulldown/MS, recombinant protein adhesion and migration assays","pmids":["17726152"],"confidence":"Low","gaps":["Single pulldown without reciprocal validation","Mechanism of integrin modulation proposed but not established","Hard to reconcile with intracellular ER exit site localization"]},{"year":2009,"claim":"The foundational study defined TANGO1 as an ER exit site transmembrane cargo receptor with a luminal collagen-binding SH3 domain and a cytoplasmic PRD that engages COPII, answering how bulky collagen VII is loaded into carriers while the receptor stays behind.","evidence":"Genome-wide screen, fractionation/imaging, domain binding assays, siRNA with collagen secretion readout","pmids":["19269366"],"confidence":"High","gaps":["Mechanism of carrier enlargement not resolved","Generality across collagen types untested"]},{"year":2011,"claim":"Knockout mice and identification of cTAGE5 as a co-receptor established that Mia3 is broadly required for secretion of all collagens and acts within a multiprotein receptor complex at ER exit sites.","evidence":"Knockout mouse with histology and collagen assays; reciprocal Co-IP and domain mapping for cTAGE5","pmids":["21606205","21525241"],"confidence":"High","gaps":["How membrane is supplied for large carriers unknown","Stoichiometry of the TANGO1/cTAGE5/COPII assembly unresolved"]},{"year":2015,"claim":"Identification of NRZ-dependent ERGIC membrane recruitment and the required SNARE set explained how TANGO1 supplies membrane to grow procollagen-sized carriers.","evidence":"siRNA, mitochondrial retargeting of the first coiled-coil, live imaging, SNARE identification","pmids":["26568311"],"confidence":"High","gaps":["Spatial coordination of fusion with bud growth not resolved","Whether membrane addition drives elongation directly untested at this stage"]},{"year":2016,"claim":"Multiple studies resolved the receptor's molecular architecture—atomic PRD-Sec23 PPP-motif binding, ring assembly coupled to NRZ-dependent retrograde flow, isoform complexes, and cargo-specific co-receptors—converting TANGO1 from a cargo receptor into an organizing scaffold of ER exit sites.","evidence":"X-ray crystallography with mutagenesis; super-resolution imaging and Co-IP for ring/NRZ; native gel and gel filtration for isoform complexes; Co-IP and cargo-specific secretion assays for TALI/ApoB","pmids":["27551091","29513218","27413011","27138255"],"confidence":"High","gaps":["Functional distinction between TANGO1L and TANGO1S incompletely defined","How ring geometry sets carrier size not directly measured"]},{"year":2016,"claim":"TANGO1 was placed in a physiological circuit: TGFβ/XBP1-driven UPR upregulates it in hepatic stellate cells to support collagen I secretion, linking the receptor to fibrosis.","evidence":"siRNA, UPR reporters, XBP1 ChIP/overexpression, heterozygous KO mouse fibrosis models","pmids":["28039913"],"confidence":"High","gaps":["Direct XBP1 binding to the MIA3 promoter not atomically mapped","Therapeutic targeting consequences not established"]},{"year":2017,"claim":"Direct binding to Sec16 and conserved Drosophila genetics established TANGO1 as an ER exit site organizer that couples ERES to Golgi and maintains organelle architecture independent of bulky cargo transport.","evidence":"Co-IP with mitochondrial retargeting rescue; Drosophila loss/gain-of-function with multi-cargo secretion assays and double-mutant epistasis","pmids":["28442536","28280122","29138315"],"confidence":"High","gaps":["Molecular basis of the secretion-independent architectural role undefined","How Sec16 binding integrates with COPII assembly mechanistically unresolved"]},{"year":2017,"claim":"An upstream regulatory axis was defined in endothelium, where ADTRP via PIK3R3-AKT controls MIA3 expression to govern monocyte adhesion and transendothelial migration.","evidence":"siRNA, constitutively active AKT1 and MIA3 overexpression rescue, endothelial functional assays","pmids":["28341552"],"confidence":"Medium","gaps":["Single lab","Connection between secretory scaffolding function and endothelial adhesion phenotype unclear"]},{"year":2018,"claim":"Reconstitution showed TANGO1, procollagen I, cTAGE5 and SEC12 are co-packaged into large COPII carriers, with HSP47 RDEL-mediated COPI retrieval recycling TANGO1, and luminal targeting of SEC12 to cargo being sufficient to generate large carriers.","evidence":"Live imaging, fractionation, split-GFP reconstitution, siRNA","pmids":["30545919"],"confidence":"High","gaps":["Quantitative contribution of SEC12 enrichment to carrier size in vivo unresolved","Generality to non-collagen bulky cargo untested"]},{"year":2020,"claim":"Biophysical modeling and reconstitution defined how the TANGO1 ring stabilizes the open bud neck as a linactant and how its membrane helices form a lipid diffusion barrier, providing a physical mechanism for large carrier formation.","evidence":"Theoretical modeling; lipid diffusion barrier reconstitution in model membranes","pmids":["33169667","32452385"],"confidence":"Medium","gaps":["Theoretical elongation model not independently validated in cells","Diffusion barrier shown only in reconstituted membranes"]},{"year":2020,"claim":"A CK1/PP1 phospho-switch was shown to control ER exit site dynamics, explaining how secretion is shut down during mitosis through TANGO1-Sec16 dissociation.","evidence":"Phosphorylation assays, kinase/phosphatase inhibitors, phospho-TANGO1/Sec16 Co-IP, cell-cycle synchronization","pmids":["32818468"],"confidence":"High","gaps":["Phosphosite mapping on TANGO1 not detailed","Whether the switch operates outside mitosis unaddressed"]},{"year":2020,"claim":"Human genetics established MIA3 as a disease gene: biallelic mutations cause a syndromal disorder via a dominant-negative truncated protein dispersed from ER exit sites.","evidence":"Whole-exome sequencing, mRNA/protein analysis, localization and collagen I secretion assays in cells","pmids":["32101163"],"confidence":"High","gaps":["Genotype-phenotype range across patients limited","Tissue-specific basis of diverse symptoms unexplained"]},{"year":2021,"claim":"Isoform-specific human knockouts revealed TANGO1S as the functionally dominant isoform, required for ER-Golgi intermediate compartment organization and secretion of cargo of all sizes, broadening TANGO1's role beyond bulky cargo.","evidence":"CRISPR isoform-specific KOs, light/electron microscopy, proteomics, transcriptomics, secretion assays","pmids":["34350936"],"confidence":"High","gaps":["Molecular basis for TANGO1S sufficiency over TANGO1L undefined","Why small-cargo secretion depends on TANGO1 mechanistically unresolved"]},{"year":null,"claim":"How TANGO1's atomically defined cargo-binding, COPII-scaffolding, and membrane-fusion activities are integrated in real time to set carrier dimensions, and how its early adhesion/tumor-suppressor activities relate to its core ER export function, remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of the assembled TANGO1 ring with cargo, COPII, and ERGIC membrane","Mechanistic link between secretory scaffolding and migration/adhesion phenotypes unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[0,6,12]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,5,9]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2,4,9]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,9,17]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,3,17]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,4,12]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,6,17]}],"complexes":["TANGO1L/cTAGE5/Sec12 (~900 kDa)","TANGO1S/cTAGE5/Sec12 (~700 kDa)","TANGO1 ring at ER exit sites","NRZ tether (NBAS/RINT1/ZW10) - associated"],"partners":["CTAGE5","SEC23","SEC16","SEC12","YKT6","TALI","HSP47","STX18"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q5JRA6","full_name":"Transport and Golgi organization protein 1 homolog","aliases":["C219-reactive peptide","D320","Melanoma inhibitory activity protein 3"],"length_aa":1907,"mass_kda":213.7,"function":"Plays a role in the transport of cargos that are too large to fit into COPII-coated vesicles and require specific mechanisms to be incorporated into membrane-bound carriers and exported from the endoplasmic reticulum. This protein is required for collagen VII (COL7A1) secretion by loading COL7A1 into transport carriers. It may participate in cargo loading of COL7A1 at endoplasmic reticulum exit sites by binding to COPII coat subunits Sec23/24 and guiding SH3-bound COL7A1 into a growing carrier. Does not play a role in global protein secretion and is apparently specific to COL7A1 cargo loading. However, it may participate in secretion of other proteins in cells that do not secrete COL7A1. It is also specifically required for the secretion of lipoproteins by participating in their export from the endoplasmic reticulum (PubMed:19269366, PubMed:27138255). 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Bio","url":"https://pubmed.ncbi.nlm.nih.gov/35865409","citation_count":21,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":40161,"output_tokens":6188,"usd":0.106651,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14781,"output_tokens":4939,"usd":0.09869,"stage2_stop_reason":"end_turn"},"total_usd":0.205341,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"TANGO1 (MIA3) is an integral membrane protein localized to ER exit sites with a luminal SH3 domain that binds collagen VII cargo and a cytoplasmic proline-rich domain (PRD) that binds COPII coat subunits Sec23/24, positioning it to load bulky collagen VII into growing COPII carriers while itself remaining excluded from the budding vesicle.\",\n      \"method\": \"Genome-wide screen, subcellular fractionation/localization, domain binding assays (SH3-collagen VII interaction, PRD-Sec23/24 interaction), siRNA knockdown with collagen secretion readout\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays for two distinct domains, localization by direct imaging, functional KD with specific cargo secretion readout, foundational study replicated extensively\",\n      \"pmids\": [\"19269366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Mia3/TANGO1 knockout mice show defective secretion of numerous collagens (I, II, III, IV, VII, IX) from multiple cell types (chondrocytes, fibroblasts, endothelial cells), intracellular collagen accumulation, unfolded protein response induction, impaired chondrocyte maturation and bone mineralization, dwarfism, and neonatal lethality, establishing that Mia3 is broadly required for efficient secretion of all collagen molecules.\",\n      \"method\": \"Knockout mouse model, immunofluorescence, Western blot, collagen secretion assays from primary cells, histology, skeletal phenotyping\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple orthogonal readouts across cell types and collagens, in vivo phenotype\",\n      \"pmids\": [\"21606205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"cTAGE5 forms a complex with TANGO1 at ER exit sites through coiled-coil domain interactions; both proteins interact with COPII Sec23/24 via their C-terminal proline-rich domains and are both required for collagen VII secretion, with cTAGE5 acting as a co-receptor of TANGO1.\",\n      \"method\": \"Co-immunoprecipitation, localization (confocal microscopy), domain mapping, siRNA knockdown with collagen secretion assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, domain-level interaction mapping, functional KD, replicated in multiple subsequent studies\",\n      \"pmids\": [\"21525241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TANGO1 recruits YKT6-containing ERGIC membranes to procollagen VII-enriched ER exit site patches; the full complement of SNAREs required for this ERGIC membrane fusion includes t-SNAREs Syntaxin 18, BNIP1, and USE1, and v-SNARE YKT6. The first coiled-coil domain (residues 1214–1396) of TANGO1 is sufficient to recruit ERGIC membranes even when artificially retargeted to mitochondria.\",\n      \"method\": \"siRNA knockdown, domain-targeting experiments (mitochondrial retargeting), live imaging, SNARE identification\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-level functional rescue experiment (mitochondrial retargeting), identification of complete SNARE set, multiple orthogonal methods\",\n      \"pmids\": [\"26568311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TANGO1 assembles into a ring at ER exit sites organized by radial interactions with COPII and lateral interactions with cTAGE5, TANGO1-short, or itself; TANGO1 recruits ERGIC membranes for collagen export via the NRZ (NBAS/RINT1/ZW10) tether complex, thereby coupling retrograde membrane flow to anterograde cargo transport. Without the NRZ complex, the TANGO1 ring does not assemble.\",\n      \"method\": \"Super-resolution microscopy, Co-IP, siRNA knockdown, domain interaction assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (imaging, Co-IP, KD), identification of NRZ as essential ring-nucleating partner\",\n      \"pmids\": [\"29513218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"X-ray crystallography and biochemical analysis showed that TANGO1 and cTAGE5 proline-rich domains (PRDs) bind Sec23 via repeated PPP motifs, enabling a single TANGO1/cTAGE5 receptor to bind multiple copies of COPII inner coat protein in a close-packed array, promoting accretion of inner coat proteins into a helical lattice for large COPII carrier formation.\",\n      \"method\": \"X-ray crystallography, biochemical binding assays (ITC/pulldown), mutagenesis of PPP motifs\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with biochemical validation and mutagenesis, mechanistically resolves PRD-Sec23 interaction at atomic level\",\n      \"pmids\": [\"27551091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TANGO1 and TALI (a chimeric MIA2/cTAGE5 protein) together bind ApoB and are both required for recruitment of ApoB-containing lipid particles (pre-chylomicrons and pre-VLDLs) to ER exit sites and their export; procollagen XII export by the same cells requires only TANGO1, not TALI, indicating cargo-specific co-receptor requirements.\",\n      \"method\": \"Co-IP (TANGO1-TALI interaction; both with ApoB), siRNA knockdown, secretion assays (ApoB, procollagen XII)\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP for multiple partners, parallel siRNA knockdowns with cargo-specific secretion readouts distinguishing TANGO1 vs. TALI requirements\",\n      \"pmids\": [\"27138255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TANGO1 exists in two stable macromolecular complexes at ER exit sites: TANGO1L/cTAGE5/Sec12 (~900 kDa) and TANGO1S/cTAGE5/Sec12 (~700 kDa); TANGO1S lacks the luminal collagen-binding domain but is independently required for collagen export from the ER. The two isoforms are interchangeable for collagen export.\",\n      \"method\": \"Native gel electrophoresis, gel filtration, siRNA knockdown of individual isoforms, collagen secretion assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical complex characterization plus functional KD, single lab, two orthogonal methods\",\n      \"pmids\": [\"27413011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The unfolded protein response (UPR) upregulates TANGO1 expression in hepatic stellate cells (HSCs) in response to TGFβ; this is mediated by the transcription factor XBP1. Depletion of TANGO1 in HSCs blocks collagen I secretion, causes procollagen I retention in the ER, induces the UPR, and leads to HSC apoptosis. TANGO1+/- mice show reduced hepatic fibrosis in CCl4 and bile duct ligation models.\",\n      \"method\": \"siRNA screen, siRNA knockdown, collagen secretion assay, UPR reporter assays, XBP1 ChIP/overexpression, heterozygous KO mouse models\",\n      \"journal\": \"Hepatology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KD, KO mouse, transcription factor identification), in vivo fibrosis models corroborating in vitro mechanism\",\n      \"pmids\": [\"28039913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TANGO1 directly interacts with Sec16, and this interaction is required for correct localization of TANGO1 isoforms and for organization of ER exit sites; depletion of TANGO1 disassembles COPII components and membrane-bound ER-resident complexes, reducing functional ER exit sites and delaying secretion. Ectopic expression of the TANGO1 C-terminal Sec16-binding domain in mitochondria recruits Sec16 and other COPII components. TANGO1 also recruits cTAGE5/Sec12-containing macromolecular complexes to ER exit sites.\",\n      \"method\": \"Co-IP (TANGO1-Sec16 interaction), mitochondrial retargeting assay, siRNA knockdown, confocal microscopy, secretion assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with domain-level rescue (mitochondrial retargeting), multiple functional readouts, replicated by independent labs\",\n      \"pmids\": [\"28442536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Drosophila, Tango1 (the only MIA/cTAGE family member in flies) forms rings that hold COPII carriers and Golgi in close proximity at ER exit sites; loss of Tango1 reduces ERES size, causes ERES-Golgi uncoupling, and impairs secretion of collagen and all other tested cargoes. Overexpression of Tango1 creates more and larger ERESs, supporting an organizer role.\",\n      \"method\": \"Genetic loss-of-function (Drosophila mutants), live imaging, immunofluorescence, secretion assays for multiple cargo types\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Drosophila ortholog, clean genetic KO, multiple cargo readouts, gain-of-function corroboration\",\n      \"pmids\": [\"28280122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Drosophila, loss of Tango1 causes ER stress and defects in cell shape secondary to retention of bulky cargo (e.g., Dumpy); removal of bulky cargo from cells restores secretion of non-bulky proteins, cell morphology, and attenuates ER stress. However, ER/Golgi morphological defects persist in the absence of bulky cargo, establishing a secretion-independent role for Tango1 in ER/Golgi architecture maintenance.\",\n      \"method\": \"Drosophila genetic loss-of-function, double-mutant epistasis (removing bulky cargo in Tango1-depleted cells), confocal imaging, ER stress assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double-mutant rescue distinguishing primary from secondary phenotypes, Drosophila ortholog with clear mechanistic logic\",\n      \"pmids\": [\"29138315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TANGO1 is co-packaged with procollagen I (PC1), cTAGE5, and SEC12 into large COPII-coated carriers; TANGO1 is retrieved back to the ER by COPI via the C-terminal RDEL retrieval sequence of HSP47. SEC12, normally excluded from small COPII vesicles, is enriched around ER membranes and large COPII carriers containing PC1; a split-GFP system reconstituting TANGO1 luminal domain targeting of SEC12 to PC1 was sufficient to generate large PC1 carriers.\",\n      \"method\": \"Live-cell imaging, subcellular fractionation, split-GFP reconstitution assay, immunofluorescence, siRNA knockdown\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution (split-GFP system), direct imaging of cargo co-packaging, fractionation; multiple orthogonal methods\",\n      \"pmids\": [\"30545919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In Drosophila salivary glands, Tango1 forms ring-like structures that mediate formation of COPII rings (not vesicles); these COPII rings act as docking sites for the cis-Golgi, and secretory mucins emerge from the Golgi side of the Tango1-COPII-Golgi complexes. Loss of Tango1 disrupts COPII ring formation, COPII-cis-Golgi association, mucin O-glycosylation, and secretory granule biogenesis. A Tango1 self-association domain essential for ring formation was identified.\",\n      \"method\": \"High-resolution fluorescence imaging (Drosophila larval salivary glands), genetic KO, domain mapping (self-association domain identification)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — high-resolution imaging with KO, domain identification, single lab\",\n      \"pmids\": [\"31690624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Theoretical/biophysical modeling shows that the TANGO1 ring acts as a linactant to stabilize the open neck of a nascent COPII bud; elongation into a procollagen-sized transport intermediate is facilitated by relief of membrane tension (via TANGO1-mediated ERGIC membrane fusion) and force application. The two TANGO1 membrane helices (TM spanning helix and IM inner-leaflet helix) together reduce lipid diffusion at curved membrane regions (reconstituted in model membranes), suggesting a mechanism to prevent membrane mixing during collagen export.\",\n      \"method\": \"Theoretical biophysical modeling; lipid diffusion barrier reconstitution in model membranes (GUVs/supported bilayers) with TANGO1 membrane helices\",\n      \"journal\": \"eLife / eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro membrane reconstitution for lipid diffusion barrier (single lab); theoretical model for bud elongation not experimentally validated independently\",\n      \"pmids\": [\"33169667\", \"32452385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TANGO1 phosphorylation is regulated by kinase CK1 (which phosphorylates TANGO1 and reduces its binding to Sec16, leading to ER exit site disassembly) and phosphatase PP1 (which dephosphorylates TANGO1). During mitosis, PP1-mediated dephosphorylation of TANGO1 decreases, resulting in net TANGO1 phosphorylation, Sec16 dissociation, and ER exit site disassembly.\",\n      \"method\": \"Phosphorylation assays, kinase/phosphatase inhibitor treatments, Co-IP (phospho-TANGO1 vs. Sec16), cell-cycle synchronization, confocal microscopy\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — identification of writer (CK1) and eraser (PP1) with functional consequence (Sec16 binding disruption and ERES disassembly), multiple methods\",\n      \"pmids\": [\"32818468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Biallelic TANGO1 mutations in humans (synonymous substitution causing exon 8 skipping and truncated protein) cause a syndromal disease with dentinogenesis imperfecta, short stature, skeletal abnormalities, diabetes, hearing loss, and intellectual disability. The truncated TANGO1 protein is dispersed in the ER (not at ER exit sites) and its expression impairs cellular collagen I secretion in cells with endogenous intact TANGO1, indicating dominant-negative activity.\",\n      \"method\": \"Whole-exome sequencing, mRNA/protein analysis, subcellular localization by fluorescence microscopy, collagen I secretion assay in transfected HeLa/U2OS cells\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetics with functional validation (localization + secretion assay), dominant-negative mechanism established\",\n      \"pmids\": [\"32101163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of both TANGO1 isoforms (TANGO1S and TANGO1L) in human cells causes major defects in secretory pathway organization including failure to maintain ERGIC53 and SURF4 localization to the ER-Golgi intermediate compartment, dramatic ultrastructural changes at the ER-Golgi interface, and impaired secretion of all secretory cargo types (large and small). Loss of TANGO1L alone has limited impact on procollagen secretion and secretory pathway organization, indicating TANGO1S is the functionally dominant isoform.\",\n      \"method\": \"CRISPR genome engineering of isoform-specific knockouts, light microscopy, electron microscopy, secretion assays, proteomics, transcriptomics\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (EM ultrastructure, proteomics, secretion assays) in engineered human cells with isoform-specific KOs\",\n      \"pmids\": [\"34350936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In Drosophila, the O-glycosyltransferase PGANT4 glycosylates Tango1 and protects it from furin (Dfur2)-mediated proteolytic cleavage; loss of PGANT4 results in Tango1 cleavage, loss of secretory granules, and disrupted apical secretion. Overexpression of Tango1 or knockdown of Dfur2 rescues the secretory defects caused by PGANT4 loss.\",\n      \"method\": \"Drosophila genetics, mass spectrometry (glycosylation identification), rescue experiments (Tango1 overexpression, Dfur2 knockdown), in vivo secretion assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — identification of PTM (O-glycosylation) and its functional consequence via genetic rescue, single lab\",\n      \"pmids\": [\"24799692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TANGO (MIA3) protein expression is reduced or lost in melanoma cell lines and tumor samples; re-expression of TANGO reduces melanoma cell motility, while antisense-mediated loss of TANGO enhances migration, establishing TANGO as a tumor suppressor that negatively regulates cell migration.\",\n      \"method\": \"RT-PCR, immunohistochemistry, stable transfection (TANGO re-expression and antisense knockdown), migration/motility assays\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional assays with both gain and loss of function, but no molecular mechanism identified; single lab\",\n      \"pmids\": [\"17044017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Recombinant TANGO (MIA3) protein interacts with the leukocyte integrin CD11c (αX/CD18) and reduces monocyte attachment to fibrinogen and ICAM-1 and to endothelial cells, while increasing the migration capacity of premonocytic cells. TANGO interaction with CD11c does not compete directly with ligand binding, suggesting modulation of integrin activity.\",\n      \"method\": \"Pulldown/affinity isolation of interacting proteins (mass spectrometry identification of CD11c), recombinant protein stimulation, attachment and migration functional assays\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pulldown identification of CD11c, functional assays with recombinant protein; mechanism of integrin modulation is proposed but not experimentally established\",\n      \"pmids\": [\"17726152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ADTRP positively regulates MIA3/TANGO1 expression via a PIK3R3-AKT signaling axis in endothelial cells; knockdown of ADTRP downregulates MIA3/TANGO1, while constitutively active AKT1 or MIA3/TANGO1 overexpression rescues endothelial cell functions (monocyte adhesion, transendothelial migration, proliferation, apoptosis) impaired by ADTRP knockdown. MIA3/TANGO1 knockdown itself promotes monocyte adhesion and transendothelial migration.\",\n      \"method\": \"siRNA knockdown, Western blot, constitutively active AKT1 rescue, overexpression, monocyte adhesion and transendothelial migration assays\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis rescue experiments establishing pathway order, functional endothelial assays, single lab\",\n      \"pmids\": [\"28341552\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TANGO1 (MIA3) is an integral ER exit site transmembrane protein that assembles into a ring by interacting radially with COPII coats (via PRD-Sec23 PPP-motif contacts) and laterally with cTAGE5, TANGO1-short, and itself; its luminal SH3-like domain captures bulky cargoes (procollagens, ApoB-lipoproteins), its cytoplasmic coiled-coil recruits ERGIC membranes via the NRZ tether and SNAREs to fuse retrograde membrane into the growing carrier neck, its membrane helices act as a lipid diffusion barrier preventing ER-ERGIC membrane mixing, and its phosphorylation by CK1 (counteracted by PP1) controls ER exit site disassembly during mitosis; collectively, TANGO1 acts as a master scaffold of the early secretory pathway, essential for the ER export of procollagens and other bulky cargoes and, in vertebrates, for general secretory pathway organization and function.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MIA3 (TANGO1) is an integral ER exit site transmembrane protein that acts as the master scaffold organizing the export of bulky secretory cargo from the endoplasmic reticulum [#0, #4]. It is structurally bifunctional: a luminal SH3-like domain captures cargoes including collagen VII, procollagens, and ApoB-lipoproteins, while its cytoplasmic proline-rich domain (PRD) binds the COPII inner coat subunit Sec23/24 through repeated PPP motifs, allowing a single receptor to nucleate accretion of multiple inner-coat copies into the helical lattice needed to build large carriers, with TANGO1 itself excluded from the budding vesicle [#0, #5]. At ER exit sites TANGO1 assembles into a ring through radial contacts with COPII and lateral self- and co-receptor interactions with cTAGE5 and the short isoform TANGO1S, and it anchors the export machinery via direct binding to Sec16, organizing functional ER exit sites and recruiting cTAGE5/Sec12 complexes [#4, #2, #9]. Ring assembly couples anterograde cargo export to retrograde membrane flow: TANGO1's first coiled-coil recruits ERGIC membranes through the NRZ (NBAS/RINT1/ZW10) tether and a SNARE set (Syntaxin 18, BNIP1, USE1, YKT6), supplying membrane to elongate procollagen-sized carriers, and its membrane helices reduce lipid diffusion to act as a barrier preventing ER–ERGIC mixing [#3, #4, #14]. Cargo selectivity is modular—ApoB-lipoprotein export additionally requires the TALI co-receptor whereas procollagen XII does not [#6]—and ER exit site assembly is dynamically controlled by CK1 phosphorylation, which dissociates TANGO1 from Sec16 to drive disassembly during mitosis, counteracted by PP1 [#15]. Loss of TANGO1 in mice causes broad collagen secretion failure, UPR induction, skeletal defects, and neonatal lethality, and in human cells disrupts secretory pathway organization at the ER-Golgi interface for cargo of all sizes [#1, #17]. Biallelic TANGO1 mutations cause a syndromal human disease with dentinogenesis imperfecta, short stature, skeletal abnormalities, diabetes, hearing loss, and intellectual disability, with the truncated protein dispersed from ER exit sites and acting dominant-negatively on collagen I secretion [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Before its secretory role was known, MIA3 was characterized as a tumor suppressor controlling cell migration, establishing the first functional link for the gene.\",\n      \"evidence\": \"RT-PCR, IHC, gain/loss-of-function migration assays in melanoma cells\",\n      \"pmids\": [\"17044017\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular mechanism connecting MIA3 to migration\", \"Relationship to its later-defined secretory function not addressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"An early candidate partner (leukocyte integrin CD11c) was identified, framing MIA3 as a modulator of integrin-mediated adhesion before its ER role emerged.\",\n      \"evidence\": \"Affinity pulldown/MS, recombinant protein adhesion and migration assays\",\n      \"pmids\": [\"17726152\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single pulldown without reciprocal validation\", \"Mechanism of integrin modulation proposed but not established\", \"Hard to reconcile with intracellular ER exit site localization\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The foundational study defined TANGO1 as an ER exit site transmembrane cargo receptor with a luminal collagen-binding SH3 domain and a cytoplasmic PRD that engages COPII, answering how bulky collagen VII is loaded into carriers while the receptor stays behind.\",\n      \"evidence\": \"Genome-wide screen, fractionation/imaging, domain binding assays, siRNA with collagen secretion readout\",\n      \"pmids\": [\"19269366\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of carrier enlargement not resolved\", \"Generality across collagen types untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Knockout mice and identification of cTAGE5 as a co-receptor established that Mia3 is broadly required for secretion of all collagens and acts within a multiprotein receptor complex at ER exit sites.\",\n      \"evidence\": \"Knockout mouse with histology and collagen assays; reciprocal Co-IP and domain mapping for cTAGE5\",\n      \"pmids\": [\"21606205\", \"21525241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How membrane is supplied for large carriers unknown\", \"Stoichiometry of the TANGO1/cTAGE5/COPII assembly unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of NRZ-dependent ERGIC membrane recruitment and the required SNARE set explained how TANGO1 supplies membrane to grow procollagen-sized carriers.\",\n      \"evidence\": \"siRNA, mitochondrial retargeting of the first coiled-coil, live imaging, SNARE identification\",\n      \"pmids\": [\"26568311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial coordination of fusion with bud growth not resolved\", \"Whether membrane addition drives elongation directly untested at this stage\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Multiple studies resolved the receptor's molecular architecture—atomic PRD-Sec23 PPP-motif binding, ring assembly coupled to NRZ-dependent retrograde flow, isoform complexes, and cargo-specific co-receptors—converting TANGO1 from a cargo receptor into an organizing scaffold of ER exit sites.\",\n      \"evidence\": \"X-ray crystallography with mutagenesis; super-resolution imaging and Co-IP for ring/NRZ; native gel and gel filtration for isoform complexes; Co-IP and cargo-specific secretion assays for TALI/ApoB\",\n      \"pmids\": [\"27551091\", \"29513218\", \"27413011\", \"27138255\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional distinction between TANGO1L and TANGO1S incompletely defined\", \"How ring geometry sets carrier size not directly measured\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"TANGO1 was placed in a physiological circuit: TGFβ/XBP1-driven UPR upregulates it in hepatic stellate cells to support collagen I secretion, linking the receptor to fibrosis.\",\n      \"evidence\": \"siRNA, UPR reporters, XBP1 ChIP/overexpression, heterozygous KO mouse fibrosis models\",\n      \"pmids\": [\"28039913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct XBP1 binding to the MIA3 promoter not atomically mapped\", \"Therapeutic targeting consequences not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Direct binding to Sec16 and conserved Drosophila genetics established TANGO1 as an ER exit site organizer that couples ERES to Golgi and maintains organelle architecture independent of bulky cargo transport.\",\n      \"evidence\": \"Co-IP with mitochondrial retargeting rescue; Drosophila loss/gain-of-function with multi-cargo secretion assays and double-mutant epistasis\",\n      \"pmids\": [\"28442536\", \"28280122\", \"29138315\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the secretion-independent architectural role undefined\", \"How Sec16 binding integrates with COPII assembly mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"An upstream regulatory axis was defined in endothelium, where ADTRP via PIK3R3-AKT controls MIA3 expression to govern monocyte adhesion and transendothelial migration.\",\n      \"evidence\": \"siRNA, constitutively active AKT1 and MIA3 overexpression rescue, endothelial functional assays\",\n      \"pmids\": [\"28341552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Connection between secretory scaffolding function and endothelial adhesion phenotype unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reconstitution showed TANGO1, procollagen I, cTAGE5 and SEC12 are co-packaged into large COPII carriers, with HSP47 RDEL-mediated COPI retrieval recycling TANGO1, and luminal targeting of SEC12 to cargo being sufficient to generate large carriers.\",\n      \"evidence\": \"Live imaging, fractionation, split-GFP reconstitution, siRNA\",\n      \"pmids\": [\"30545919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of SEC12 enrichment to carrier size in vivo unresolved\", \"Generality to non-collagen bulky cargo untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Biophysical modeling and reconstitution defined how the TANGO1 ring stabilizes the open bud neck as a linactant and how its membrane helices form a lipid diffusion barrier, providing a physical mechanism for large carrier formation.\",\n      \"evidence\": \"Theoretical modeling; lipid diffusion barrier reconstitution in model membranes\",\n      \"pmids\": [\"33169667\", \"32452385\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Theoretical elongation model not independently validated in cells\", \"Diffusion barrier shown only in reconstituted membranes\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A CK1/PP1 phospho-switch was shown to control ER exit site dynamics, explaining how secretion is shut down during mitosis through TANGO1-Sec16 dissociation.\",\n      \"evidence\": \"Phosphorylation assays, kinase/phosphatase inhibitors, phospho-TANGO1/Sec16 Co-IP, cell-cycle synchronization\",\n      \"pmids\": [\"32818468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphosite mapping on TANGO1 not detailed\", \"Whether the switch operates outside mitosis unaddressed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Human genetics established MIA3 as a disease gene: biallelic mutations cause a syndromal disorder via a dominant-negative truncated protein dispersed from ER exit sites.\",\n      \"evidence\": \"Whole-exome sequencing, mRNA/protein analysis, localization and collagen I secretion assays in cells\",\n      \"pmids\": [\"32101163\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype range across patients limited\", \"Tissue-specific basis of diverse symptoms unexplained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Isoform-specific human knockouts revealed TANGO1S as the functionally dominant isoform, required for ER-Golgi intermediate compartment organization and secretion of cargo of all sizes, broadening TANGO1's role beyond bulky cargo.\",\n      \"evidence\": \"CRISPR isoform-specific KOs, light/electron microscopy, proteomics, transcriptomics, secretion assays\",\n      \"pmids\": [\"34350936\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for TANGO1S sufficiency over TANGO1L undefined\", \"Why small-cargo secretion depends on TANGO1 mechanistically unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TANGO1's atomically defined cargo-binding, COPII-scaffolding, and membrane-fusion activities are integrated in real time to set carrier dimensions, and how its early adhesion/tumor-suppressor activities relate to its core ER export function, remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of the assembled TANGO1 ring with cargo, COPII, and ERGIC membrane\", \"Mechanistic link between secretory scaffolding and migration/adhesion phenotypes unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [0, 6, 12]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 5, 9]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2, 4, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 9, 17]},\n      {\"term_id\": \"GO:0005789\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 3, 17]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 4, 12]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 6, 17]}\n    ],\n    \"complexes\": [\n      \"TANGO1L/cTAGE5/Sec12 (~900 kDa)\",\n      \"TANGO1S/cTAGE5/Sec12 (~700 kDa)\",\n      \"TANGO1 ring at ER exit sites\",\n      \"NRZ tether (NBAS/RINT1/ZW10) - associated\"\n    ],\n    \"partners\": [\n      \"cTAGE5\",\n      \"SEC23\",\n      \"SEC16\",\n      \"SEC12\",\n      \"YKT6\",\n      \"TALI\",\n      \"HSP47\",\n      \"STX18\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}