{"gene":"CAVIN1","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":1998,"finding":"PTRF (Pol I and transcript release factor) is required for dissociation of paused ternary RNA Polymerase I transcription complexes: recombinant PTRF releases both Pol I and nascent transcripts from the template in vitro, interacts with TTF-I (transcription termination factor), interacts with Pol I, and binds specifically to transcripts containing 3'-terminal uridylates of pre-rRNA; substitution of 3'-terminal uridylates by guanine abolishes binding and impairs release activity.","method":"In vitro transcription termination assay with recombinant PTRF, RNA-binding assay, protein-protein interaction assays (PTRF–TTF-I and PTRF–Pol I)","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro termination assay with recombinant protein, mutagenesis of RNA substrate, multiple orthogonal methods in single study","pmids":["9582279"],"is_preprint":false},{"year":1999,"finding":"PTRF interacts physically with the largest subunit of murine RNA Pol I and with both TTF-I and its yeast homolog Reb1p (but not the lac repressor); PTRF promotes release of terminated transcripts from ternary complexes paused by TTF-I/Reb1p but cannot dissociate Pol I paused by the lac repressor, demonstrating specificity for termination-factor-mediated pausing.","method":"In vitro transcription assay on immobilized tailed templates with yeast and mouse terminators; protein interaction assays","journal":"Molecular & general genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro assay replicated across species (yeast/mouse templates), multiple interaction partners tested with positive and negative controls","pmids":["10589839"],"is_preprint":false},{"year":2000,"finding":"PTRF interacts with the BFCOL1 zinc-finger transcription factor (identified by yeast two-hybrid), enhances BFCOL1 binding to its site in the mouse proalpha2(I) collagen promoter in vitro, and has a suppressive effect on mouse proalpha2(I) collagen proximal promoter activity in transfection assays.","method":"Yeast two-hybrid, in vitro DNA-binding assay with recombinant proteins, transient transfection/promoter reporter assay","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus in vitro binding plus reporter assay, single lab","pmids":["10727401"],"is_preprint":false},{"year":2001,"finding":"PTRF-mediated release of pre-rRNA from terminated transcription complexes facilitates reinitiation of RNA Pol I transcription (transcriptional enhancement observed on terminator-containing templates in multiple-round but not single-round assays, absent in PTRF-free reconstituted system); PTRF is phosphorylated at multiple sites and exists in transcriptionally active and inactive forms, suggesting its activity is regulated post-translationally.","method":"In vitro multiple-round vs. single-round Pol I transcription assays on terminator-containing and terminator-less templates; PTRF-free reconstituted system; charge heterogeneity/phosphorylation analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted transcription system with defined PTRF-free control, multiple orthogonal methods, functional epistasis via reconstitution","pmids":["11139612"],"is_preprint":false},{"year":2004,"finding":"PTRF is a major peripheral protein at the cytosolic surface of caveolae in human adipocytes, co-localizes with caveolin-1 by immunofluorescence, is present in intact and five differently truncated forms at the caveolae surface, contains phosphorylation sites at Ser-36, Ser-40, Ser-365 and Ser-366, and is cleaved at two endogenous calpain-specificity sites flanked by phosphorylated sequences within PEST domains.","method":"Vectorial proteomics (trypsin-based differential surface proteolysis + nanospray-QTOF MS), immunofluorescence confocal microscopy, phosphopeptide mapping","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative MS with orthogonal imaging, specific phosphorylation sites mapped, single lab but multiple methods","pmids":["15242332"],"is_preprint":false},{"year":2008,"finding":"PTRF/Cavin-1 is required for caveola formation and for sequestration of mobile caveolin into immobile caveolae at the plasma membrane: PTRF-Cavin selectively associates with mature caveolae (not Golgi-localized caveolin); expression of PTRF in PTRF-negative PC3 cells is sufficient to induce caveola formation; PTRF knockdown reduces caveolae density; without PTRF, caveolin-1 exhibits increased lateral mobility and accelerated lysosomal degradation.","method":"Comparative proteomics, live-cell fluorescence imaging (FRAP), knockdown (siRNA/morpholino) in mammalian cells and zebrafish, ectopic expression in PC3 cells, electron microscopy","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (proteomics, FRAP, KD, OE, EM) replicated across mammalian cells and zebrafish","pmids":["18191225"],"is_preprint":false},{"year":2008,"finding":"Genetic deletion of Cavin/PTRF in mice abolishes caveolae in all cell types examined and markedly reduces protein (but not mRNA) levels of all three caveolin isoforms, demonstrating that Cavin-1 is required post-translationally for caveolin stability; knockout mice develop lipodystrophy, dyslipidemia, and glucose intolerance.","method":"Targeted gene disruption (knockout mice), electron microscopy, western blot, qRT-PCR, metabolic phenotyping","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with EM-confirmed loss of caveolae, protein vs. mRNA dissociation, well-controlled in vivo study","pmids":["18840361"],"is_preprint":false},{"year":2009,"finding":"PTRF mutations in patients cause mislocalization of PTRF and disruption of its physical interaction with caveolins; patient muscle biopsies show deficiency and mislocalization of all three caveolin family members and reduction of caveolae structures, confirming PTRF's essential role in caveolin localization and caveola formation in humans.","method":"Patient muscle biopsy, immunofluorescence, co-immunoprecipitation (PTRF–caveolin interaction), overexpression of disease-mimicking mutants in myoblasts","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetics combined with co-IP of interaction and cellular localization experiments across independent patients","pmids":["19726876"],"is_preprint":false},{"year":2010,"finding":"PTRF/Cavin-1 expression in PTRF-negative PC3 prostate cancer cells decreases cell migration via reduced MMP-9 production; this effect on MMP-9 is independent of caveola formation.","method":"Ectopic expression, cell migration assays, MMP-9 ELISA/zymography, comparison with cavin-2/3/4","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assay with pathway placement (MMP-9), caveola-independence established by comparison, single lab","pmids":["20732728"],"is_preprint":false},{"year":2010,"finding":"In the absence of PTRF-CAVIN, caveolin-1 fails to localize to the cell surface in patient fibroblasts (electron microscopy shows >97% reduction in caveolae); transfection of full-length PTRF-CAVIN reestablishes caveolae.","method":"Patient fibroblast analysis, electron microscopy, atomic force microscopy combined with fluorescence imaging, rescue transfection","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — EM quantification, AFM, and functional rescue by reintroduction of full-length protein, multiple orthogonal methods","pmids":["20300641"],"is_preprint":false},{"year":2010,"finding":"IGF-IR co-immunoprecipitates with PTRF/Cavin during IGF-1-induced receptor internalization; PTRF/Cavin silencing decreases IGF-IR plasma membrane recovery after internalization; Caveolin-1 phosphorylation at Tyr14 is required for normal IGF-IR internalization.","method":"Co-immunoprecipitation, siRNA knockdown, flow cytometry for surface IGF-IR, Cav-1 Y14F mutant transfection","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and functional knockdown with defined receptor trafficking readout, single lab","pmids":["21152401"],"is_preprint":false},{"year":2011,"finding":"PTRF acts as a docking/anchoring protein for MG53 at membrane injury sites, potentially through binding exposed membrane cholesterol; cells lacking PTRF show defective MG53 trafficking to injury sites; a disease-associated PTRF mutation causes aberrant nuclear localization of PTRF and disrupts MG53 function in membrane resealing; overexpression of PTRF rescues membrane repair defects in dystrophic muscle.","method":"Live-cell imaging of membrane repair, RNAi knockdown, ectopic expression, disease-mutant analysis, overexpression rescue in dystrophic muscle cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging of MG53 trafficking, KD and rescue assays, disease mutation tested, single lab","pmids":["21343302"],"is_preprint":false},{"year":2011,"finding":"Oxidative stress upregulates PTRF/cavin-1 and promotes its interaction with caveolin-1, increasing caveolae number; PTRF/cavin-1 is required for oxidant-induced sequestration of Mdm2 into caveolar membranes away from p53, activating the p53/p21 pathway and inducing premature senescence; a PTRF mutant unable to localize to caveolar membranes after oxidative stress fails to activate p53 and does not induce senescence.","method":"shRNA knockdown, mutant PTRF (membrane-localization defective) expression, immunofluorescence, co-immunoprecipitation (PTRF–caveolin-1), p53/p21 pathway analysis, senescence assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, functional mutant, KD with specific mechanistic pathway readout, single lab","pmids":["21705337"],"is_preprint":false},{"year":2011,"finding":"PTRF localizes primarily to nuclei in young/quiescent fibroblasts but translocates to cytosol and plasma membrane during senescence; PTRF overexpression increases caveolae and induces cellular senescence; reduced PTRF extends replicative lifespan; PTRF's role in senescence depends on its interaction with caveolin-1 and targeting to caveolae, which is regulated by PTRF phosphorylation.","method":"Immunofluorescence, electron microscopy, overexpression, siRNA knockdown, replicative lifespan assay, co-immunoprecipitation (PTRF–caveolin-1), phosphorylation analysis","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods including EM, co-IP, functional OE/KD, single lab","pmids":["21445100"],"is_preprint":false},{"year":2011,"finding":"PTRF expression in PC3 cells impairs recruitment of actin cytoskeletal proteins to detergent-resistant membranes, correlating with altered cholesterol distribution; this reduces secretion of a subset of proteins including secreted proteases, cytokines, and growth regulatory proteins, partly via reduction in prostasome secretion; several proteins involved in ER-to-Golgi trafficking were reduced by PTRF.","method":"SILAC quantitative proteomics, subcellular fractionation (detergent-resistant membranes), total membrane proteomics, cholesterol modulation experiments","journal":"Molecular & cellular proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative proteomics with subcellular fractionation and cholesterol manipulation, single lab","pmids":["22030351"],"is_preprint":false},{"year":2012,"finding":"PTRF/cavin-1 modulates cellular polarization and the subcellular localization of Rac1, caveolin-1, and PKCα in migrating cells; PTRF quantitatively reduces cell migration and induces mesenchymal-epithelial reversion; caveola-independent functions of PTRF in cell migration were identified by selectively manipulating caveola formation in multiple cell systems.","method":"Fluorescence imaging, quantitative proteomics, cell migration assays, selective manipulation of PTRF and caveolin-1 expression in multiple cell lines","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays in multiple cell systems, proteomics, identification of caveola-independent mechanism, single lab","pmids":["22912783"],"is_preprint":false},{"year":2013,"finding":"Cavin-1 expression in PC3 prostate cancer cells (which lack endogenous cavin-1) attenuates the pro-tumorigenic effects of non-caveolar caveolin-1 microdomains; cavin-1 co-expression in caveolin-1-positive LNCaP cells reverses the caveolin-1-mediated increase in anchorage-independent growth; these effects occur partly via reduced IL-6 microenvironmental signaling.","method":"Ectopic expression, anchorage-independent growth assay, orthotopic xenograft mouse model, IL-6 measurement, tissue microarray","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cell line systems plus in vivo xenograft, pathway (IL-6) identified, single lab","pmids":["23934189"],"is_preprint":false},{"year":2013,"finding":"PTRF/cavin-1 is essential for multidrug resistance in breast cancer MCF-7/ADR cells: PTRF is upregulated in lipid rafts of drug-resistant cells; PTRF knockdown reduces lipid raft abundance at the cell surface and reduces multidrug resistance.","method":"Label-free quantitative proteomics of lipid rafts, lipid raft staining (S-laurdan2, FITC-CTxB), siRNA knockdown, drug resistance assays","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics plus functional KD with defined resistance readout, single lab","pmids":["23214712"],"is_preprint":false},{"year":2014,"finding":"Cavin-3 is targeted to caveolae by cavin-1 (PTRF), where it interacts with the scaffolding domain of caveolin-1 and promotes caveolae dynamics; the N-terminal region of cavin-3 binds a trimer of the cavin-1 N-terminus in competition with a homologous cavin-2 region, showing that cavins form distinct subcomplexes; cavin-3 loss increases stable caveolae and decreases short-lived caveolae.","method":"Live-cell imaging (caveolae dynamics), pulldown/interaction assays, cell-based localization, cavin-3 knockout/overexpression","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell imaging of caveolae dynamics plus binding studies, single lab","pmids":["25588833"],"is_preprint":false},{"year":2014,"finding":"In cavin-1-null mice adipocytes, lipolytic defects are caused by impaired perilipin phosphorylation; reduced triglyceride accumulation results from decreased fatty acid uptake and incorporation and near absence of insulin-stimulated glucose transport; adipocytes are small and insensitive to insulin and β-adrenergic agonists.","method":"Cavin-1 knockout mice, metabolic phenotyping, insulin/β-adrenergic stimulation assays, perilipin phosphorylation analysis, glucose transport assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular mechanisms (perilipin phosphorylation, glucose transport) across multiple metabolic pathways","pmids":["24509860"],"is_preprint":false},{"year":2014,"finding":"PTRF overexpression compromises adipocyte differentiation of 3T3-L1 cells; lentiviral PTRF overexpression inhibits adipogenesis; PTRF mRNA positively correlates with markers of lipolysis and cellular senescence in human adipose tissue.","method":"Lentiviral and pharmacological overexpression, 3T3-L1 differentiation assay, proteomics, human adipose tissue correlation","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional overexpression in cellular differentiation model with proteomics, single lab","pmids":["24812087"],"is_preprint":false},{"year":2014,"finding":"PTRF interacts with PDGF receptors (PDGFRs); this interaction is increased in senescent cells; PTRF overexpression in presenescent cells impairs ERK1/2 phosphorylation upon PDGF stimulation, suggesting PTRF sequesters PDGFRs and attenuates their signaling.","method":"Co-immunoprecipitation (PTRF–PDGFR), ERK1/2 phosphorylation assay, PTRF overexpression in young cells, comparison with senescent cells","journal":"Clinical and experimental pharmacology & physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with functional signaling readout, single lab","pmids":["24471649"],"is_preprint":false},{"year":2014,"finding":"The N-terminal leucine-zipper motif of PTRF/cavin-1 is essential and sufficient for its association with caveolae at the plasma membrane; deletion of this motif causes exclusive nuclear localization; fusion of this motif to the nuclear protein histone 2A redirects it to the plasma membrane; caveolae-associated PTRF (not nuclear PTRF) is required for its role in cell migration.","method":"Deletion mutants, fusion protein targeting assay, cavin-1 knockout MEFs, cell migration rescue experiments","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain dissection with multiple mutants and rescue assays, single lab","pmids":["25514038"],"is_preprint":false},{"year":2016,"finding":"Purified Cavin1 60S complexes form a flexible net-like protein mesh that creates polyhedral lattices on phosphatidylserine-containing vesicles; the two coiled-coil domains mediate distinct assembly steps in 60S complex formation; positively charged residues around the C-terminal coiled-coil domain are required for membrane binding; purified caveolin 8S oligomers form disc-shaped arrangements consistent with occupying the faces of caveolar polyhedra.","method":"Electron cryotomography, liposome reconstitution with purified proteins, coiled-coil domain mutagenesis, solution structural analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-ET structural analysis with reconstitution and mutagenesis, direct structural validation","pmids":["27834731"],"is_preprint":false},{"year":2016,"finding":"ROR1 functions as a scaffold for cavin-1 and caveolin-1 at the plasma membrane in a kinase-independent manner; ROR1 facilitates cavin-1–caveolin-1 interactions, preventing lysosomal degradation of CAV1 and sustaining caveolae structures and pro-survival AKT signaling.","method":"Co-immunoprecipitation (ROR1–cavin-1–CAV1 complex), kinase-dead ROR1 mutants, knockdown, caveolae structural analysis, AKT signaling readout","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of tripartite complex plus kinase-dead mutant plus functional signaling, single lab","pmids":["26725982"],"is_preprint":false},{"year":2016,"finding":"PTRF/Cavin-1 promotes ribosomal RNA transcription in response to metabolic challenges in mature adipocytes via a caveolae-independent mechanism; multiple post-translational modifications of PTRF regulate its transcriptional activity; PTRF-mediated rDNA transcription is required for adipocyte allostasis.","method":"Cavin-1 knockout mouse adipocytes, rRNA transcription assays, PTM analysis, metabolic challenge experiments","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with rRNA transcription readout plus PTM analysis, caveolae-independence established, single lab","pmids":["27528195"],"is_preprint":false},{"year":2017,"finding":"Cavin-1 is acutely translocated from caveolae to focal complex compartments upon insulin stimulation in adipocytes, where it regulates focal complex formation through an interaction with paxillin; loss of cavin-1 impairs focal complex remodeling and focal adhesion formation and causes a mechanical stress response with activation of pro-inflammatory and senescence/apoptosis pathways.","method":"Cavin-1 knockout mice, subcellular fractionation, immunoblotting, co-immunoprecipitation (cavin-1–paxillin), insulin stimulation experiments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse plus co-IP plus defined translocation mechanism, single lab","pmids":["31126986"],"is_preprint":false},{"year":2018,"finding":"SOCS3 localizes to the plasma membrane via interaction with cavin-1; deletion of SOCS3 reduces cavin-1 and caveolin-1 protein expression and caveola abundance; cavin-1–SOCS3 interaction is essential for SOCS3-dependent inhibition of IL-6/STAT3 signaling; loss of cavin-1 enhances cytokine-stimulated STAT3 phosphorylation and abolishes SOCS3-mediated inhibition of IL-6 signaling by cyclic AMP.","method":"Co-immunoprecipitation, confocal imaging (SOCS3 localization), SOCS3 knockout cells, cytokine signaling assays (STAT3 phosphorylation), cAMP treatment","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, confocal imaging, KO with defined cytokine signaling readout, multiple orthogonal methods","pmids":["29330478"],"is_preprint":false},{"year":2019,"finding":"High glucose suppresses CAV1-CAVIN1-LC3B-mediated autophagic degradation of CAV1 via inhibition of the AMPK-MTOR-PIK3C3 pathway, causing CAV1 accumulation and increased caveolae formation that facilitates LDL transcytosis across endothelial cells.","method":"siRNA knockdown of CAVIN1/CAV1, autophagy inhibitors/activators, LDL transcytosis assay, AMPK/mTOR/PI3K pathway inhibitors, immunofluorescence","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pathway inhibitors and KD with defined transcytosis readout, single lab","pmids":["31448673"],"is_preprint":false},{"year":2021,"finding":"Caveolin-1 and cavin-1 individually sort distinct plasma membrane lipids; intact caveolae containing both proteins generate a unique lipid nano-environment with selectivities for both lipid headgroups and acyl chains, as determined by quantitative nanoscale lipid mapping and molecular dynamics simulations.","method":"Quantitative nanoscale lipid mapping (STED-FCS or equivalent), molecular dynamics simulations, genome-edited cells expressing/lacking CAV1 and cavin-1","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — nanoscale lipid mapping plus MD simulations plus genome-edited cells, multiple orthogonal methods in one rigorous study","pmids":["33496726"],"is_preprint":false},{"year":2021,"finding":"PTRF stabilizes cPLA2 protein by decreasing its proteasome-mediated degradation, thereby increasing cPLA2 activity; this leads to phospholipid remodeling, altered endocytosis capacity, altered energy metabolism, and suppression of CD8+ tumor-infiltrating lymphocytes in glioblastoma.","method":"Co-immunoprecipitation, western blotting, proteasome inhibitor experiments, nontargeted metabolomics/lipidomics, in vivo xenograft and intracranial tumor models","journal":"Neuro-oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus proteasome pathway validation plus in vivo functional data, single lab","pmids":["33140095"],"is_preprint":false},{"year":2022,"finding":"PTRF/Cavin-1 acts as an RNA-binding protein; it interacts with lncRNA NEAT1 (identified by RIP-Seq and RIP assay), stabilizing NEAT1 mRNA; NEAT1 stabilization suppresses UBXN1 expression, activating NF-κB, which transcriptionally upregulates PD-L1; this PTRF-NEAT1-NF-κB-PD-L1 axis promotes immune evasion in glioblastoma.","method":"RIP-Seq, RIP assay, ChIP assay, qRT-PCR, co-immunoprecipitation, luciferase reporter (implied by PD-L1 transcription analysis), T cell cytotoxicity assay","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-Seq plus RIP plus ChIP establishing RNA-binding and downstream pathway, single lab","pmids":["35069587"],"is_preprint":false},{"year":2022,"finding":"Membrane insertion of Cavin1 is mediated by PI(4,5)P2-dependent adsorption of the trimeric helical region 1 (HR1) followed by partial separation and membrane insertion of individual HR1 helices; the flanking negatively charged disordered regions enhance insertion kinetics and are important for co-assembly of Cavin1 with Caveolin1 in living cells.","method":"Model membrane biophysics (lipid bilayer experiments), biophysical dissection, molecular dynamics simulations, cell-based co-assembly assays with HR1 mutants","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in model membranes plus MD simulations plus cellular validation, multiple orthogonal methods","pmids":["35696574"],"is_preprint":false},{"year":2022,"finding":"HIF-1α and STAT3 regulate PTRF expression by binding to its promoter in neuronal cells under ischemia-reperfusion conditions (shown by ChIP and luciferase assays); neuronal PTRF overexpression enhances cPLA2 activity and stability by decreasing proteasome-mediated degradation; the PTRF-cPLA2 axis promotes lipid peroxidation, autophagy, and ferroptosis in neurons.","method":"ChIP, luciferase assay, co-immunoprecipitation, lentiviral sgRNA/AAV-shRNA knockdown, in vivo cerebral I/R mouse model","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and co-IP establishing transcriptional regulation and protein stabilization, in vivo validation, single lab","pmids":["35547748"],"is_preprint":false},{"year":2022,"finding":"PTRF promotes TMZ efflux from glioblastoma cells through extracellular vesicles; PTRF knockdown decreases TMZ efflux via EVs and sensitizes GBM cells to TMZ.","method":"PTRF knockdown (siRNA), intracellular TMZ concentration measurement, EV isolation/characterization (TEM, NTA, WB), clone formation/CCK-8 assays, flow cytometry, PDX models","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined TMZ efflux readout via EVs, multiple cellular and in vivo models, single lab","pmids":["35673568"],"is_preprint":false},{"year":2022,"finding":"UBE2O ubiquitinates PTRF/CAVIN1 directly (shown by ubiquitination assay and immunoprecipitation); UBE2O decreases caveolae formation and inhibits PTRF-dependent exosome secretion; CAVIN2/SDPR interacts with both UBE2O and PTRF and promotes PTRF expression in exosomes, but UBE2O inhibition of exosome-related PTRF secretion prevails even with SDPR present.","method":"Immunoprecipitation (endogenous and exogenous), ubiquitination assay, exosome isolation by ultracentrifugation, TEM/NTA/WB characterization of exosomes","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay plus co-IP plus functional exosome secretion readout, single lab","pmids":["36443833"],"is_preprint":false},{"year":2022,"finding":"Caveolae deformation (osmotic stress) triggers relocalization of cavin-1 from the plasma membrane to the nucleus, where it promotes rRNA transcription; cavin-1 knockout cells show adaptive changes in cytosolic RNA levels and reduced ability to form stress granules, demonstrating a mechanistic link between caveolae integrity and global transcriptional/translational regulation.","method":"Osmotic stress experiments, cavin-1 knockout cell line, immunofluorescence (cavin-1 localization), cytosolic RNA measurement, stress granule/p-body imaging","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO cell line with defined relocalization and functional transcription/RNA readouts, single lab","pmids":["35513070"],"is_preprint":false},{"year":2023,"finding":"Oxidative stress triggers lipid peroxidation and caveolar disassembly, releasing CAVIN1 from caveolae; released CAVIN1 directly interacts with NRF2 and facilitates NRF2 degradation; CAVIN1-null cells show impaired negative regulation of NRF2, conferring resistance to lipid-peroxidation-induced ferroptosis; this mechanism operates in cultured cells and in vivo (Cavin1-null zebrafish).","method":"Quantitative whole-cell proteomics of genome-edited cells, co-immunoprecipitation (CAVIN1–NRF2), live-cell caveolae disassembly imaging, Cavin1-null zebrafish wound response, ferroptosis assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative proteomics in genome-edited cells, co-IP of CAVIN1-NRF2, in vivo zebrafish validation, multiple orthogonal methods","pmids":["36858041"],"is_preprint":false},{"year":2024,"finding":"CAVIN1 expression level determines interindividual susceptibility to drug-induced long QT syndrome by controlling hERG channel dynamics: sotalol treatment promotes translocation of hERG from the plasma membrane to cytoskeleton-associated fractions in a CAVIN1-dependent manner; CAVIN1 knockdown reduces caveolae and abrogates hERG translocation and IKr reduction; CAVIN1 overexpression in low-sensitivity cardiomyocytes confers high sensitivity to hERG blockers.","method":"Patient-specific iPSC-derived cardiomyocytes, electrophysiology (IKr measurement), siRNA knockdown, adenoviral CAVIN1 overexpression, cellular fractionation, imaging of hERG and caveolae","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — human iPSC-CM model with electrophysiology, KD and OE with reciprocal effects, cellular fractionation establishing mechanism, replicated across multiple hERG blockers","pmids":["38682330"],"is_preprint":false},{"year":2024,"finding":"The Cavin-1/Caveolin-1 interaction attenuates BMP/Smad signaling: hypoxia enhances the CAV1/Cavin-1 interaction while reducing the CAV1/BMPR2 interaction and BMPR2 membrane localization in pulmonary artery endothelial cells; Cavin-1 competes with BMPR2 for binding to the CAV1 scaffolding domain, reducing Smad signal transduction; Cavin-1 knockdown is resistant to CAV1-induced pulmonary hypertension in vivo.","method":"Co-immunoprecipitation (CAV1–Cavin-1, CAV1–BMPR2), domain-binding assays (CAV1 scaffolding domain), Cavin-1 knockdown in PAECs, in vivo CAV1-induced pulmonary hypertension model","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of competing interactions plus in vivo KD model, single lab","pmids":["38182755"],"is_preprint":false},{"year":2020,"finding":"Cavin-1 deficiency impairs fenestration in liver sinusoidal endothelial cells (LSECs) by inhibiting the RhoA-ROCK2-LIMK-Cofilin signaling pathway and suppressing cytoskeleton dynamics; reduced LSEC fenestrae impairs hepatic glycogen metabolism leading to lethal neonatal hypoglycemia in C57BL/6J mice; treatment with the F-actin depolymerization reagent latrunculin A rescues fenestration defects.","method":"Cavin-1 knockout mice (C57BL/6J), electron microscopy of LSEC fenestrae, RhoA-ROCK2-LIMK-Cofilin pathway analysis, latrunculin A rescue experiment, glycogen/glucose measurements","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mice with EM structural analysis, pathway identification, and pharmacological rescue, single lab","pmids":["33042738"],"is_preprint":false},{"year":2017,"finding":"Cavin-1 deficiency in mice causes muscular dystrophy characterized by constitutive Akt pathway activation, muscle hypertrophy with increased fiber size, fibrosis, impaired membrane integrity with compensatory activation of the dystrophin-glycoprotein complex, elevated muscle repair proteins, and decreased mitochondrial function and oxygen consumption.","method":"PTRF/cavin-1 null mice, exercise capacity testing, histology, western blot (Akt pathway activation, dystrophin-glycoprotein complex), mitochondrial function assays, myofiber composition analysis","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined molecular pathways (Akt, DGC), multiple readouts, single lab","pmids":["28289716"],"is_preprint":false},{"year":2016,"finding":"Cavin-1 downregulation in vascular smooth muscle cells after balloon injury is mediated by proteasomal (not lysosomal) degradation; cavin-1 inhibition promotes VSMC proliferation and migration via increased ERK phosphorylation and MMP-9 activity; cavin-1 regulates caveolin-1 expression via the lysosomal degradation pathway.","method":"In vivo carotid artery balloon injury model, shRNA knockdown in vivo, proteasome/lysosome inhibitors (MG132, chloroquine), ERK phosphorylation assay, MMP-9 activity, VSMC proliferation/migration assays","journal":"Journal of the American Heart Association","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro KD with defined degradation pathway and signaling readouts, single lab","pmids":["28751541"],"is_preprint":false},{"year":2022,"finding":"Cavin-1 promotes M2 macrophage/microglia polarization via interaction with SOCS3; Cavin-1 and SOCS3 positively correlate during M2 polarization; Cavin-1 silencing suppresses STAT6/PPARγ pathway activation and anti-inflammatory factor release; SOCS3 overexpression reverses the inhibitory effect of Cavin-1 silencing on M2 polarization.","method":"Co-immunoprecipitation (Cavin-1–SOCS3), siRNA knockdown of Cavin-1, STAT6/PPARγ pathway analysis, RT-PCR of M2 markers","journal":"Inflammation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional KD with epistasis (SOCS3 OE rescue), single lab","pmids":["35275225"],"is_preprint":false}],"current_model":"CAVIN1/PTRF is a dual-function cytoplasmic protein: at the plasma membrane it is an essential structural coat component of caveolae, where it binds phosphatidylserine and PI(4,5)P2 via its HR1 domain, stabilizes caveolin-1 (preventing its lateral diffusion and lysosomal degradation), forms a polyhedral net-like 60S oligomeric coat with two functionally distinct coiled-coil assembly domains, and scaffolds signaling complexes including SOCS3, MG53, hERG channels, and various receptor tyrosine kinases; in the nucleus it dissociates paused RNA Pol I ternary complexes by interacting with TTF-I, Pol I, and 3'-uridylate-containing pre-rRNA transcripts, thereby facilitating transcription termination and reinitiation; mechanosensory caveolar disassembly (triggered by osmotic stress or lipid peroxidation) releases CAVIN1 to the nucleus (where it promotes rDNA transcription) or to the cytoplasm (where it directly interacts with NRF2 to facilitate its degradation, maintaining cellular susceptibility to oxidative stress); CAVIN1 is also ubiquitinated by UBE2O and phosphorylated at Ser-36/40/365/366, regulating its activity and localization, and its interaction with paxillin at focal adhesions links metabolic stimulation (insulin) to cytoskeletal remodeling in adipocytes."},"narrative":{"mechanistic_narrative":"CAVIN1 (PTRF) is a dual-function protein that originated as an RNA Polymerase I transcript release factor and is now established as an essential structural coat component of plasma membrane caveolae [PMID:9582279, PMID:18191225]. At the membrane, CAVIN1 builds caveolae by forming a flexible polyhedral net-like 60S protein mesh on phosphatidylserine-containing bilayers, using two coiled-coil domains for distinct assembly steps and a PI(4,5)P2-dependent trimeric HR1 region that adsorbs to and inserts into the membrane [PMID:27834731, PMID:35696574]. It is required for caveola formation and for sequestering mobile caveolin-1 into immobile caveolae, where it stabilizes caveolin-1 against lateral diffusion and lysosomal degradation post-translationally; loss of CAVIN1 in mice and humans abolishes caveolae, destabilizes all three caveolin isoforms, and causes lipodystrophy and muscle disease [PMID:18191225, PMID:18840361, PMID:19726876, PMID:20300641]. Together with caveolin-1, CAVIN1 generates a distinct caveolar lipid nano-environment selective for specific headgroups and acyl chains [PMID:33496726]. CAVIN1 scaffolds and regulates signaling at caveolae, including SOCS3-dependent inhibition of IL-6/STAT3 signaling, competition with BMPR2 for the caveolin-1 scaffolding domain to attenuate BMP/Smad signaling, and control of hERG channel dynamics that determines susceptibility to drug-induced long QT syndrome [PMID:29330478, PMID:38182755, PMID:38682330]. Mechanosensory caveolar disassembly releases CAVIN1 to other compartments: osmotic stress drives it to the nucleus where it promotes rRNA transcription, recapitulating its founding role of dissociating paused Pol I ternary complexes via interactions with TTF-I, Pol I, and 3'-uridylate-containing pre-rRNA [PMID:9582279, PMID:10589839, PMID:11139612, PMID:35513070], while lipid peroxidation releases CAVIN1 to directly bind and promote degradation of NRF2, maintaining susceptibility to oxidative-stress-induced ferroptosis [PMID:36858041]. Inherited CAVIN1 mutations that mislocalize the protein and disrupt its caveolin interaction cause a human disease with deficiency of caveolae and all caveolin isoforms in muscle [PMID:19726876]. CAVIN1 activity and localization are regulated post-translationally by phosphorylation at Ser-36/40/365/366 and by direct ubiquitination by UBE2O [PMID:15242332, PMID:36443833].","teleology":[{"year":1998,"claim":"Established the founding biochemical function of the protein: how paused RNA Pol I complexes are resolved to terminate transcription.","evidence":"Reconstituted in vitro termination assay with recombinant PTRF, RNA-binding assay with substrate mutagenesis, and PTRF–TTF-I/Pol I interaction assays","pmids":["9582279","10589839"],"confidence":"High","gaps":["Did not address whether this nuclear function operates in vivo under physiological conditions","No structural basis for 3'-uridylate recognition"]},{"year":2001,"claim":"Showed transcript release is coupled to reinitiation and that PTRF activity is post-translationally tunable, framing it as a regulated factor rather than a constitutive one.","evidence":"Multiple-round vs single-round Pol I transcription assays in a PTRF-free reconstituted system; phosphorylation/charge heterogeneity analysis","pmids":["11139612"],"confidence":"High","gaps":["Specific phosphorylation sites controlling transcriptional activity not mapped here","Kinases responsible unknown"]},{"year":2004,"claim":"Relocated the protein to a second compartment by identifying it as a major peripheral coat protein on the cytosolic face of caveolae, mapping its phosphosites and PEST/calpain cleavage features.","evidence":"Vectorial surface proteomics with MS, confocal immunofluorescence, and phosphopeptide mapping in human adipocytes","pmids":["15242332"],"confidence":"High","gaps":["Did not establish whether caveolar association is required for caveola formation","Functional consequence of each phosphosite unresolved"]},{"year":2008,"claim":"Demonstrated CAVIN1 is necessary and sufficient for caveola formation and post-translationally stabilizes caveolin-1, defining its core structural role in vivo.","evidence":"FRAP, siRNA/morpholino knockdown, ectopic expression in PC3 cells, EM in mammalian cells and zebrafish; knockout mouse with metabolic phenotyping","pmids":["18191225","18840361"],"confidence":"High","gaps":["Molecular mechanism of caveolin-1 stabilization not resolved at structural level","Link between metabolic phenotype and specific caveolar function unclear"]},{"year":2010,"claim":"Confirmed the structural role in humans, establishing CAVIN1 loss-of-function as a cause of human caveolae/caveolin deficiency.","evidence":"Patient muscle biopsy and fibroblast EM/AFM, co-IP, and rescue by reintroduction of full-length protein","pmids":["19726876","20300641"],"confidence":"High","gaps":["Genotype–phenotype relationship across mutations not detailed","Tissue-specific consequences of caveola loss not fully mapped"]},{"year":2014,"claim":"Mapped the molecular determinants of compartmental targeting, showing an N-terminal leucine-zipper motif is necessary and sufficient for caveolar association versus nuclear localization.","evidence":"Deletion mutants, fusion-protein targeting to histone H2A, and cavin-1 KO MEF migration rescue assays","pmids":["25514038"],"confidence":"Medium","gaps":["Signal controlling switch between nuclear and membrane pools in cells not defined","Single lab"]},{"year":2016,"claim":"Provided the structural model of the caveolar coat, showing how CAVIN1 60S complexes build a polyhedral lattice on phosphatidylserine vesicles using two functionally distinct coiled-coil domains.","evidence":"Electron cryotomography, liposome reconstitution with purified proteins, and coiled-coil mutagenesis","pmids":["27834731"],"confidence":"High","gaps":["Stoichiometry with caveolin in intact caveolae not fully resolved","How the coat couples to membrane curvature generation in cells"]},{"year":2016,"claim":"Separated CAVIN1's nuclear transcriptional function from its caveolar role, showing it drives rDNA transcription during metabolic challenge by a caveola-independent mechanism.","evidence":"Cavin-1 KO mouse adipocytes, rRNA transcription assays, and PTM analysis under metabolic challenge","pmids":["27528195"],"confidence":"Medium","gaps":["Which PTMs gate nuclear transcriptional activity not defined","Single lab"]},{"year":2018,"claim":"Defined CAVIN1 as a signaling scaffold, anchoring SOCS3 at the membrane to enable inhibition of IL-6/STAT3 signaling.","evidence":"Reciprocal co-IP, confocal imaging of SOCS3 localization, SOCS3 KO cells and STAT3 phosphorylation/cAMP assays","pmids":["29330478"],"confidence":"High","gaps":["Whether scaffolding is caveolae-dependent not fully resolved","Structural basis of CAVIN1–SOCS3 interaction unknown"]},{"year":2021,"claim":"Showed CAVIN1 and caveolin-1 jointly sculpt a unique caveolar lipid nano-environment, linking the coat to membrane lipid organization.","evidence":"Quantitative nanoscale lipid mapping and MD simulations in genome-edited cells","pmids":["33496726"],"confidence":"High","gaps":["Functional consequences of the lipid nano-environment for signaling not established here"]},{"year":2022,"claim":"Defined the biophysics of membrane insertion, showing PI(4,5)P2-dependent HR1 adsorption and helix insertion with flanking disordered regions accelerating assembly.","evidence":"Model membrane biophysics, MD simulations, and cellular co-assembly assays with HR1 mutants","pmids":["35696574"],"confidence":"High","gaps":["How insertion is coupled to oligomeric lattice formation in vivo not fully resolved"]},{"year":2022,"claim":"Connected caveolar mechanics to gene expression, showing caveolae deformation by osmotic stress relocalizes CAVIN1 to the nucleus to promote rRNA transcription and influence RNA/stress-granule homeostasis.","evidence":"Osmotic stress, cavin-1 KO cells, immunofluorescence localization, cytosolic RNA and stress-granule imaging","pmids":["35513070"],"confidence":"Medium","gaps":["Quantitative fraction of CAVIN1 mobilized to nucleus unclear","Single lab"]},{"year":2022,"claim":"Identified direct ubiquitination by UBE2O as a regulator of CAVIN1 levels, caveola formation, and CAVIN1 secretion in exosomes.","evidence":"Endogenous/exogenous IP, in vitro ubiquitination assay, and exosome isolation/characterization","pmids":["36443833"],"confidence":"Medium","gaps":["Ubiquitination site(s) on CAVIN1 not mapped","Single lab"]},{"year":2023,"claim":"Established a mechanosensory oxidative-stress arm, showing lipid-peroxidation-driven caveolar disassembly releases CAVIN1 to directly bind and promote NRF2 degradation, controlling ferroptosis susceptibility.","evidence":"Quantitative whole-cell proteomics of genome-edited cells, CAVIN1–NRF2 co-IP, live caveolae-disassembly imaging, and Cavin1-null zebrafish wound/ferroptosis assays","pmids":["36858041"],"confidence":"High","gaps":["Mechanism by which CAVIN1 promotes NRF2 degradation (E3 recruitment vs direct) not defined","Structural basis of CAVIN1–NRF2 interaction unknown"]},{"year":2024,"claim":"Linked CAVIN1 expression to clinically relevant ion-channel behavior, showing it controls hERG translocation and determines individual susceptibility to drug-induced long QT syndrome.","evidence":"Patient-specific iPSC-derived cardiomyocytes, IKr electrophysiology, siRNA knockdown and adenoviral overexpression with cellular fractionation across multiple hERG blockers","pmids":["38682330"],"confidence":"High","gaps":["Whether CAVIN1 directly binds hERG or acts via caveolae not distinguished","In vivo arrhythmia consequences not tested here"]},{"year":null,"claim":"How a single protein partitions quantitatively among its caveolar structural pool, nuclear transcriptional pool, and cytoplasmic signaling pool — and which specific PTMs and stress signals dictate this partitioning — remains unresolved.","evidence":"No single study integrates the PTM code, mechanosensory triggers, and compartmental destinations into one quantitative model","pmids":[],"confidence":"Medium","gaps":["No structure of full-length CAVIN1 in any compartment","Functional phosphosites and ubiquitination sites incompletely mapped","Mechanism coupling caveolar disassembly to choice of nuclear vs cytoplasmic destination unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[5,9,23,32]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[23,29,32]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,31]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3,25]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[27,24,39]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,6,37]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,5,22]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,22,36]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[13,37]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[26]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,3,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[27,39,24]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[5,6,9,23]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[36,37]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[6,19]}],"complexes":["caveolar coat (60S cavin complex)"],"partners":["CAV1","TTF-I","SOCS3","NRF2","PAXILLIN","CAVIN3","BMPR2","UBE2O"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6NZI2","full_name":"Caveolae-associated protein 1","aliases":["Cavin-1","Polymerase I and transcript release factor"],"length_aa":390,"mass_kda":43.5,"function":"Plays an important role in caveolae formation and organization. Essential for the formation of caveolae in all tissues (PubMed:18056712, PubMed:18191225, PubMed:19726876). Core component of the CAVIN complex which is essential for recruitment of the complex to the caveolae in presence of calveolin-1 (CAV1). Essential for normal oligomerization of CAV1. Promotes ribosomal transcriptional activity in response to metabolic challenges in the adipocytes and plays an important role in the formation of the ribosomal transcriptional loop. Dissociates transcription complexes paused by DNA-bound TTF1, thereby releasing both RNA polymerase I and pre-RNA from the template (By similarity) (PubMed:18056712, PubMed:18191225, PubMed:19726876). The caveolae biogenesis pathway is required for the secretion of proteins such as GASK1A (By similarity)","subcellular_location":"Membrane, caveola; Cell membrane; Microsome; Endoplasmic reticulum; Cytoplasm, cytosol; Mitochondrion; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q6NZI2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CAVIN1","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CAVIN1","total_profiled":1310},"omim":[{"mim_id":"620413","title":"GOLGI-ASSOCIATED KINASE 1A; GASK1A","url":"https://www.omim.org/entry/620413"},{"mim_id":"618303","title":"CAVEOLAE-ASSOCIATED PROTEIN 3; CAVIN3","url":"https://www.omim.org/entry/618303"},{"mim_id":"613327","title":"LIPODYSTROPHY, CONGENITAL GENERALIZED, TYPE 4; CGL4","url":"https://www.omim.org/entry/613327"},{"mim_id":"608594","title":"LIPODYSTROPHY, CONGENITAL GENERALIZED, TYPE 1; CGL1","url":"https://www.omim.org/entry/608594"},{"mim_id":"606513","title":"PROTEIN KINASE C AND CASEIN KINASE SUBSTRATE IN NEURONS 3; PACSIN3","url":"https://www.omim.org/entry/606513"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CAVIN1"},"hgnc":{"alias_symbol":["cavin-1","CGL4"],"prev_symbol":["PTRF"]},"alphafold":{"accession":"Q6NZI2","domains":[{"cath_id":"1.20.5","chopping":"45-120","consensus_level":"medium","plddt":96.6976,"start":45,"end":120},{"cath_id":"1.20.5","chopping":"217-300","consensus_level":"medium","plddt":72.9048,"start":217,"end":300}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6NZI2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6NZI2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6NZI2-F1-predicted_aligned_error_v6.png","plddt_mean":67.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CAVIN1","jax_strain_url":"https://www.jax.org/strain/search?query=CAVIN1"},"sequence":{"accession":"Q6NZI2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6NZI2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6NZI2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6NZI2"}},"corpus_meta":[{"pmid":"18191225","id":"PMC_18191225","title":"PTRF-Cavin, a conserved cytoplasmic protein required for caveola formation and function.","date":"2008","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/18191225","citation_count":593,"is_preprint":false},{"pmid":"19726876","id":"PMC_19726876","title":"Human PTRF mutations cause secondary deficiency of caveolins resulting in muscular dystrophy with generalized lipodystrophy.","date":"2009","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/19726876","citation_count":303,"is_preprint":false},{"pmid":"18840361","id":"PMC_18840361","title":"Deletion of Cavin/PTRF causes global loss of caveolae, dyslipidemia, and glucose intolerance.","date":"2008","source":"Cell metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/18840361","citation_count":292,"is_preprint":false},{"pmid":"20300641","id":"PMC_20300641","title":"Fatal cardiac arrhythmia and long-QT syndrome in a new form of congenital generalized lipodystrophy with muscle rippling (CGL4) due to PTRF-CAVIN mutations.","date":"2010","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20300641","citation_count":181,"is_preprint":false},{"pmid":"9582279","id":"PMC_9582279","title":"Cloning and functional characterization of PTRF, a novel protein which induces dissociation of paused ternary transcription complexes.","date":"1998","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/9582279","citation_count":128,"is_preprint":false},{"pmid":"15242332","id":"PMC_15242332","title":"Vectorial proteomics reveal targeting, phosphorylation and specific fragmentation of polymerase I and transcript release factor (PTRF) at the surface of caveolae in human adipocytes.","date":"2004","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/15242332","citation_count":124,"is_preprint":false},{"pmid":"29556340","id":"PMC_29556340","title":"The role of PTRF/Cavin1 as a biomarker in both glioma and serum exosomes.","date":"2018","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/29556340","citation_count":110,"is_preprint":false},{"pmid":"20684003","id":"PMC_20684003","title":"Congenital generalized lipodystrophy, type 4 (CGL4) associated with myopathy due to novel PTRF mutations.","date":"2010","source":"American journal of medical genetics. 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chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/35513070","citation_count":7,"is_preprint":false},{"pmid":"32467771","id":"PMC_32467771","title":"Unusual clinical features associated with congenital generalized lipodystrophy type 4 in a patient with a novel E211X CAVIN1 gene variant.","date":"2020","source":"Clinical diabetes and endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/32467771","citation_count":7,"is_preprint":false},{"pmid":"38682330","id":"PMC_38682330","title":"CAVIN1-Mediated hERG Dynamics: A Novel Mechanism Underlying the Interindividual Variability in Drug-Induced Long QT.","date":"2024","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/38682330","citation_count":5,"is_preprint":false},{"pmid":"29381831","id":"PMC_29381831","title":"Ptrf transgenic mice exhibit obesity and fatty liver.","date":"2018","source":"Clinical and experimental pharmacology & physiology","url":"https://pubmed.ncbi.nlm.nih.gov/29381831","citation_count":5,"is_preprint":false},{"pmid":"40745979","id":"PMC_40745979","title":"PTRF Confers Melanoma-Acquired Drug Resistance Through the Upregulation of EGFR.","date":"2025","source":"Cell proliferation","url":"https://pubmed.ncbi.nlm.nih.gov/40745979","citation_count":4,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52419,"output_tokens":11329,"usd":0.163596,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":22423,"output_tokens":5177,"usd":0.12077,"stage2_stop_reason":"end_turn"},"total_usd":0.284366,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"PTRF (Pol I and transcript release factor) is required for dissociation of paused ternary RNA Polymerase I transcription complexes: recombinant PTRF releases both Pol I and nascent transcripts from the template in vitro, interacts with TTF-I (transcription termination factor), interacts with Pol I, and binds specifically to transcripts containing 3'-terminal uridylates of pre-rRNA; substitution of 3'-terminal uridylates by guanine abolishes binding and impairs release activity.\",\n      \"method\": \"In vitro transcription termination assay with recombinant PTRF, RNA-binding assay, protein-protein interaction assays (PTRF–TTF-I and PTRF–Pol I)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro termination assay with recombinant protein, mutagenesis of RNA substrate, multiple orthogonal methods in single study\",\n      \"pmids\": [\"9582279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"PTRF interacts physically with the largest subunit of murine RNA Pol I and with both TTF-I and its yeast homolog Reb1p (but not the lac repressor); PTRF promotes release of terminated transcripts from ternary complexes paused by TTF-I/Reb1p but cannot dissociate Pol I paused by the lac repressor, demonstrating specificity for termination-factor-mediated pausing.\",\n      \"method\": \"In vitro transcription assay on immobilized tailed templates with yeast and mouse terminators; protein interaction assays\",\n      \"journal\": \"Molecular & general genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro assay replicated across species (yeast/mouse templates), multiple interaction partners tested with positive and negative controls\",\n      \"pmids\": [\"10589839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"PTRF interacts with the BFCOL1 zinc-finger transcription factor (identified by yeast two-hybrid), enhances BFCOL1 binding to its site in the mouse proalpha2(I) collagen promoter in vitro, and has a suppressive effect on mouse proalpha2(I) collagen proximal promoter activity in transfection assays.\",\n      \"method\": \"Yeast two-hybrid, in vitro DNA-binding assay with recombinant proteins, transient transfection/promoter reporter assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus in vitro binding plus reporter assay, single lab\",\n      \"pmids\": [\"10727401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PTRF-mediated release of pre-rRNA from terminated transcription complexes facilitates reinitiation of RNA Pol I transcription (transcriptional enhancement observed on terminator-containing templates in multiple-round but not single-round assays, absent in PTRF-free reconstituted system); PTRF is phosphorylated at multiple sites and exists in transcriptionally active and inactive forms, suggesting its activity is regulated post-translationally.\",\n      \"method\": \"In vitro multiple-round vs. single-round Pol I transcription assays on terminator-containing and terminator-less templates; PTRF-free reconstituted system; charge heterogeneity/phosphorylation analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted transcription system with defined PTRF-free control, multiple orthogonal methods, functional epistasis via reconstitution\",\n      \"pmids\": [\"11139612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PTRF is a major peripheral protein at the cytosolic surface of caveolae in human adipocytes, co-localizes with caveolin-1 by immunofluorescence, is present in intact and five differently truncated forms at the caveolae surface, contains phosphorylation sites at Ser-36, Ser-40, Ser-365 and Ser-366, and is cleaved at two endogenous calpain-specificity sites flanked by phosphorylated sequences within PEST domains.\",\n      \"method\": \"Vectorial proteomics (trypsin-based differential surface proteolysis + nanospray-QTOF MS), immunofluorescence confocal microscopy, phosphopeptide mapping\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative MS with orthogonal imaging, specific phosphorylation sites mapped, single lab but multiple methods\",\n      \"pmids\": [\"15242332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PTRF/Cavin-1 is required for caveola formation and for sequestration of mobile caveolin into immobile caveolae at the plasma membrane: PTRF-Cavin selectively associates with mature caveolae (not Golgi-localized caveolin); expression of PTRF in PTRF-negative PC3 cells is sufficient to induce caveola formation; PTRF knockdown reduces caveolae density; without PTRF, caveolin-1 exhibits increased lateral mobility and accelerated lysosomal degradation.\",\n      \"method\": \"Comparative proteomics, live-cell fluorescence imaging (FRAP), knockdown (siRNA/morpholino) in mammalian cells and zebrafish, ectopic expression in PC3 cells, electron microscopy\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (proteomics, FRAP, KD, OE, EM) replicated across mammalian cells and zebrafish\",\n      \"pmids\": [\"18191225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Genetic deletion of Cavin/PTRF in mice abolishes caveolae in all cell types examined and markedly reduces protein (but not mRNA) levels of all three caveolin isoforms, demonstrating that Cavin-1 is required post-translationally for caveolin stability; knockout mice develop lipodystrophy, dyslipidemia, and glucose intolerance.\",\n      \"method\": \"Targeted gene disruption (knockout mice), electron microscopy, western blot, qRT-PCR, metabolic phenotyping\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with EM-confirmed loss of caveolae, protein vs. mRNA dissociation, well-controlled in vivo study\",\n      \"pmids\": [\"18840361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PTRF mutations in patients cause mislocalization of PTRF and disruption of its physical interaction with caveolins; patient muscle biopsies show deficiency and mislocalization of all three caveolin family members and reduction of caveolae structures, confirming PTRF's essential role in caveolin localization and caveola formation in humans.\",\n      \"method\": \"Patient muscle biopsy, immunofluorescence, co-immunoprecipitation (PTRF–caveolin interaction), overexpression of disease-mimicking mutants in myoblasts\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetics combined with co-IP of interaction and cellular localization experiments across independent patients\",\n      \"pmids\": [\"19726876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PTRF/Cavin-1 expression in PTRF-negative PC3 prostate cancer cells decreases cell migration via reduced MMP-9 production; this effect on MMP-9 is independent of caveola formation.\",\n      \"method\": \"Ectopic expression, cell migration assays, MMP-9 ELISA/zymography, comparison with cavin-2/3/4\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assay with pathway placement (MMP-9), caveola-independence established by comparison, single lab\",\n      \"pmids\": [\"20732728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In the absence of PTRF-CAVIN, caveolin-1 fails to localize to the cell surface in patient fibroblasts (electron microscopy shows >97% reduction in caveolae); transfection of full-length PTRF-CAVIN reestablishes caveolae.\",\n      \"method\": \"Patient fibroblast analysis, electron microscopy, atomic force microscopy combined with fluorescence imaging, rescue transfection\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — EM quantification, AFM, and functional rescue by reintroduction of full-length protein, multiple orthogonal methods\",\n      \"pmids\": [\"20300641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"IGF-IR co-immunoprecipitates with PTRF/Cavin during IGF-1-induced receptor internalization; PTRF/Cavin silencing decreases IGF-IR plasma membrane recovery after internalization; Caveolin-1 phosphorylation at Tyr14 is required for normal IGF-IR internalization.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, flow cytometry for surface IGF-IR, Cav-1 Y14F mutant transfection\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and functional knockdown with defined receptor trafficking readout, single lab\",\n      \"pmids\": [\"21152401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PTRF acts as a docking/anchoring protein for MG53 at membrane injury sites, potentially through binding exposed membrane cholesterol; cells lacking PTRF show defective MG53 trafficking to injury sites; a disease-associated PTRF mutation causes aberrant nuclear localization of PTRF and disrupts MG53 function in membrane resealing; overexpression of PTRF rescues membrane repair defects in dystrophic muscle.\",\n      \"method\": \"Live-cell imaging of membrane repair, RNAi knockdown, ectopic expression, disease-mutant analysis, overexpression rescue in dystrophic muscle cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging of MG53 trafficking, KD and rescue assays, disease mutation tested, single lab\",\n      \"pmids\": [\"21343302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Oxidative stress upregulates PTRF/cavin-1 and promotes its interaction with caveolin-1, increasing caveolae number; PTRF/cavin-1 is required for oxidant-induced sequestration of Mdm2 into caveolar membranes away from p53, activating the p53/p21 pathway and inducing premature senescence; a PTRF mutant unable to localize to caveolar membranes after oxidative stress fails to activate p53 and does not induce senescence.\",\n      \"method\": \"shRNA knockdown, mutant PTRF (membrane-localization defective) expression, immunofluorescence, co-immunoprecipitation (PTRF–caveolin-1), p53/p21 pathway analysis, senescence assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, functional mutant, KD with specific mechanistic pathway readout, single lab\",\n      \"pmids\": [\"21705337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PTRF localizes primarily to nuclei in young/quiescent fibroblasts but translocates to cytosol and plasma membrane during senescence; PTRF overexpression increases caveolae and induces cellular senescence; reduced PTRF extends replicative lifespan; PTRF's role in senescence depends on its interaction with caveolin-1 and targeting to caveolae, which is regulated by PTRF phosphorylation.\",\n      \"method\": \"Immunofluorescence, electron microscopy, overexpression, siRNA knockdown, replicative lifespan assay, co-immunoprecipitation (PTRF–caveolin-1), phosphorylation analysis\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods including EM, co-IP, functional OE/KD, single lab\",\n      \"pmids\": [\"21445100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PTRF expression in PC3 cells impairs recruitment of actin cytoskeletal proteins to detergent-resistant membranes, correlating with altered cholesterol distribution; this reduces secretion of a subset of proteins including secreted proteases, cytokines, and growth regulatory proteins, partly via reduction in prostasome secretion; several proteins involved in ER-to-Golgi trafficking were reduced by PTRF.\",\n      \"method\": \"SILAC quantitative proteomics, subcellular fractionation (detergent-resistant membranes), total membrane proteomics, cholesterol modulation experiments\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative proteomics with subcellular fractionation and cholesterol manipulation, single lab\",\n      \"pmids\": [\"22030351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PTRF/cavin-1 modulates cellular polarization and the subcellular localization of Rac1, caveolin-1, and PKCα in migrating cells; PTRF quantitatively reduces cell migration and induces mesenchymal-epithelial reversion; caveola-independent functions of PTRF in cell migration were identified by selectively manipulating caveola formation in multiple cell systems.\",\n      \"method\": \"Fluorescence imaging, quantitative proteomics, cell migration assays, selective manipulation of PTRF and caveolin-1 expression in multiple cell lines\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays in multiple cell systems, proteomics, identification of caveola-independent mechanism, single lab\",\n      \"pmids\": [\"22912783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cavin-1 expression in PC3 prostate cancer cells (which lack endogenous cavin-1) attenuates the pro-tumorigenic effects of non-caveolar caveolin-1 microdomains; cavin-1 co-expression in caveolin-1-positive LNCaP cells reverses the caveolin-1-mediated increase in anchorage-independent growth; these effects occur partly via reduced IL-6 microenvironmental signaling.\",\n      \"method\": \"Ectopic expression, anchorage-independent growth assay, orthotopic xenograft mouse model, IL-6 measurement, tissue microarray\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cell line systems plus in vivo xenograft, pathway (IL-6) identified, single lab\",\n      \"pmids\": [\"23934189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PTRF/cavin-1 is essential for multidrug resistance in breast cancer MCF-7/ADR cells: PTRF is upregulated in lipid rafts of drug-resistant cells; PTRF knockdown reduces lipid raft abundance at the cell surface and reduces multidrug resistance.\",\n      \"method\": \"Label-free quantitative proteomics of lipid rafts, lipid raft staining (S-laurdan2, FITC-CTxB), siRNA knockdown, drug resistance assays\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics plus functional KD with defined resistance readout, single lab\",\n      \"pmids\": [\"23214712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cavin-3 is targeted to caveolae by cavin-1 (PTRF), where it interacts with the scaffolding domain of caveolin-1 and promotes caveolae dynamics; the N-terminal region of cavin-3 binds a trimer of the cavin-1 N-terminus in competition with a homologous cavin-2 region, showing that cavins form distinct subcomplexes; cavin-3 loss increases stable caveolae and decreases short-lived caveolae.\",\n      \"method\": \"Live-cell imaging (caveolae dynamics), pulldown/interaction assays, cell-based localization, cavin-3 knockout/overexpression\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell imaging of caveolae dynamics plus binding studies, single lab\",\n      \"pmids\": [\"25588833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In cavin-1-null mice adipocytes, lipolytic defects are caused by impaired perilipin phosphorylation; reduced triglyceride accumulation results from decreased fatty acid uptake and incorporation and near absence of insulin-stimulated glucose transport; adipocytes are small and insensitive to insulin and β-adrenergic agonists.\",\n      \"method\": \"Cavin-1 knockout mice, metabolic phenotyping, insulin/β-adrenergic stimulation assays, perilipin phosphorylation analysis, glucose transport assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular mechanisms (perilipin phosphorylation, glucose transport) across multiple metabolic pathways\",\n      \"pmids\": [\"24509860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PTRF overexpression compromises adipocyte differentiation of 3T3-L1 cells; lentiviral PTRF overexpression inhibits adipogenesis; PTRF mRNA positively correlates with markers of lipolysis and cellular senescence in human adipose tissue.\",\n      \"method\": \"Lentiviral and pharmacological overexpression, 3T3-L1 differentiation assay, proteomics, human adipose tissue correlation\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional overexpression in cellular differentiation model with proteomics, single lab\",\n      \"pmids\": [\"24812087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PTRF interacts with PDGF receptors (PDGFRs); this interaction is increased in senescent cells; PTRF overexpression in presenescent cells impairs ERK1/2 phosphorylation upon PDGF stimulation, suggesting PTRF sequesters PDGFRs and attenuates their signaling.\",\n      \"method\": \"Co-immunoprecipitation (PTRF–PDGFR), ERK1/2 phosphorylation assay, PTRF overexpression in young cells, comparison with senescent cells\",\n      \"journal\": \"Clinical and experimental pharmacology & physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with functional signaling readout, single lab\",\n      \"pmids\": [\"24471649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The N-terminal leucine-zipper motif of PTRF/cavin-1 is essential and sufficient for its association with caveolae at the plasma membrane; deletion of this motif causes exclusive nuclear localization; fusion of this motif to the nuclear protein histone 2A redirects it to the plasma membrane; caveolae-associated PTRF (not nuclear PTRF) is required for its role in cell migration.\",\n      \"method\": \"Deletion mutants, fusion protein targeting assay, cavin-1 knockout MEFs, cell migration rescue experiments\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain dissection with multiple mutants and rescue assays, single lab\",\n      \"pmids\": [\"25514038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Purified Cavin1 60S complexes form a flexible net-like protein mesh that creates polyhedral lattices on phosphatidylserine-containing vesicles; the two coiled-coil domains mediate distinct assembly steps in 60S complex formation; positively charged residues around the C-terminal coiled-coil domain are required for membrane binding; purified caveolin 8S oligomers form disc-shaped arrangements consistent with occupying the faces of caveolar polyhedra.\",\n      \"method\": \"Electron cryotomography, liposome reconstitution with purified proteins, coiled-coil domain mutagenesis, solution structural analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-ET structural analysis with reconstitution and mutagenesis, direct structural validation\",\n      \"pmids\": [\"27834731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ROR1 functions as a scaffold for cavin-1 and caveolin-1 at the plasma membrane in a kinase-independent manner; ROR1 facilitates cavin-1–caveolin-1 interactions, preventing lysosomal degradation of CAV1 and sustaining caveolae structures and pro-survival AKT signaling.\",\n      \"method\": \"Co-immunoprecipitation (ROR1–cavin-1–CAV1 complex), kinase-dead ROR1 mutants, knockdown, caveolae structural analysis, AKT signaling readout\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of tripartite complex plus kinase-dead mutant plus functional signaling, single lab\",\n      \"pmids\": [\"26725982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PTRF/Cavin-1 promotes ribosomal RNA transcription in response to metabolic challenges in mature adipocytes via a caveolae-independent mechanism; multiple post-translational modifications of PTRF regulate its transcriptional activity; PTRF-mediated rDNA transcription is required for adipocyte allostasis.\",\n      \"method\": \"Cavin-1 knockout mouse adipocytes, rRNA transcription assays, PTM analysis, metabolic challenge experiments\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with rRNA transcription readout plus PTM analysis, caveolae-independence established, single lab\",\n      \"pmids\": [\"27528195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cavin-1 is acutely translocated from caveolae to focal complex compartments upon insulin stimulation in adipocytes, where it regulates focal complex formation through an interaction with paxillin; loss of cavin-1 impairs focal complex remodeling and focal adhesion formation and causes a mechanical stress response with activation of pro-inflammatory and senescence/apoptosis pathways.\",\n      \"method\": \"Cavin-1 knockout mice, subcellular fractionation, immunoblotting, co-immunoprecipitation (cavin-1–paxillin), insulin stimulation experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse plus co-IP plus defined translocation mechanism, single lab\",\n      \"pmids\": [\"31126986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SOCS3 localizes to the plasma membrane via interaction with cavin-1; deletion of SOCS3 reduces cavin-1 and caveolin-1 protein expression and caveola abundance; cavin-1–SOCS3 interaction is essential for SOCS3-dependent inhibition of IL-6/STAT3 signaling; loss of cavin-1 enhances cytokine-stimulated STAT3 phosphorylation and abolishes SOCS3-mediated inhibition of IL-6 signaling by cyclic AMP.\",\n      \"method\": \"Co-immunoprecipitation, confocal imaging (SOCS3 localization), SOCS3 knockout cells, cytokine signaling assays (STAT3 phosphorylation), cAMP treatment\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, confocal imaging, KO with defined cytokine signaling readout, multiple orthogonal methods\",\n      \"pmids\": [\"29330478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"High glucose suppresses CAV1-CAVIN1-LC3B-mediated autophagic degradation of CAV1 via inhibition of the AMPK-MTOR-PIK3C3 pathway, causing CAV1 accumulation and increased caveolae formation that facilitates LDL transcytosis across endothelial cells.\",\n      \"method\": \"siRNA knockdown of CAVIN1/CAV1, autophagy inhibitors/activators, LDL transcytosis assay, AMPK/mTOR/PI3K pathway inhibitors, immunofluorescence\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pathway inhibitors and KD with defined transcytosis readout, single lab\",\n      \"pmids\": [\"31448673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Caveolin-1 and cavin-1 individually sort distinct plasma membrane lipids; intact caveolae containing both proteins generate a unique lipid nano-environment with selectivities for both lipid headgroups and acyl chains, as determined by quantitative nanoscale lipid mapping and molecular dynamics simulations.\",\n      \"method\": \"Quantitative nanoscale lipid mapping (STED-FCS or equivalent), molecular dynamics simulations, genome-edited cells expressing/lacking CAV1 and cavin-1\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — nanoscale lipid mapping plus MD simulations plus genome-edited cells, multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"33496726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PTRF stabilizes cPLA2 protein by decreasing its proteasome-mediated degradation, thereby increasing cPLA2 activity; this leads to phospholipid remodeling, altered endocytosis capacity, altered energy metabolism, and suppression of CD8+ tumor-infiltrating lymphocytes in glioblastoma.\",\n      \"method\": \"Co-immunoprecipitation, western blotting, proteasome inhibitor experiments, nontargeted metabolomics/lipidomics, in vivo xenograft and intracranial tumor models\",\n      \"journal\": \"Neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus proteasome pathway validation plus in vivo functional data, single lab\",\n      \"pmids\": [\"33140095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PTRF/Cavin-1 acts as an RNA-binding protein; it interacts with lncRNA NEAT1 (identified by RIP-Seq and RIP assay), stabilizing NEAT1 mRNA; NEAT1 stabilization suppresses UBXN1 expression, activating NF-κB, which transcriptionally upregulates PD-L1; this PTRF-NEAT1-NF-κB-PD-L1 axis promotes immune evasion in glioblastoma.\",\n      \"method\": \"RIP-Seq, RIP assay, ChIP assay, qRT-PCR, co-immunoprecipitation, luciferase reporter (implied by PD-L1 transcription analysis), T cell cytotoxicity assay\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-Seq plus RIP plus ChIP establishing RNA-binding and downstream pathway, single lab\",\n      \"pmids\": [\"35069587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Membrane insertion of Cavin1 is mediated by PI(4,5)P2-dependent adsorption of the trimeric helical region 1 (HR1) followed by partial separation and membrane insertion of individual HR1 helices; the flanking negatively charged disordered regions enhance insertion kinetics and are important for co-assembly of Cavin1 with Caveolin1 in living cells.\",\n      \"method\": \"Model membrane biophysics (lipid bilayer experiments), biophysical dissection, molecular dynamics simulations, cell-based co-assembly assays with HR1 mutants\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in model membranes plus MD simulations plus cellular validation, multiple orthogonal methods\",\n      \"pmids\": [\"35696574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HIF-1α and STAT3 regulate PTRF expression by binding to its promoter in neuronal cells under ischemia-reperfusion conditions (shown by ChIP and luciferase assays); neuronal PTRF overexpression enhances cPLA2 activity and stability by decreasing proteasome-mediated degradation; the PTRF-cPLA2 axis promotes lipid peroxidation, autophagy, and ferroptosis in neurons.\",\n      \"method\": \"ChIP, luciferase assay, co-immunoprecipitation, lentiviral sgRNA/AAV-shRNA knockdown, in vivo cerebral I/R mouse model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and co-IP establishing transcriptional regulation and protein stabilization, in vivo validation, single lab\",\n      \"pmids\": [\"35547748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PTRF promotes TMZ efflux from glioblastoma cells through extracellular vesicles; PTRF knockdown decreases TMZ efflux via EVs and sensitizes GBM cells to TMZ.\",\n      \"method\": \"PTRF knockdown (siRNA), intracellular TMZ concentration measurement, EV isolation/characterization (TEM, NTA, WB), clone formation/CCK-8 assays, flow cytometry, PDX models\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined TMZ efflux readout via EVs, multiple cellular and in vivo models, single lab\",\n      \"pmids\": [\"35673568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"UBE2O ubiquitinates PTRF/CAVIN1 directly (shown by ubiquitination assay and immunoprecipitation); UBE2O decreases caveolae formation and inhibits PTRF-dependent exosome secretion; CAVIN2/SDPR interacts with both UBE2O and PTRF and promotes PTRF expression in exosomes, but UBE2O inhibition of exosome-related PTRF secretion prevails even with SDPR present.\",\n      \"method\": \"Immunoprecipitation (endogenous and exogenous), ubiquitination assay, exosome isolation by ultracentrifugation, TEM/NTA/WB characterization of exosomes\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay plus co-IP plus functional exosome secretion readout, single lab\",\n      \"pmids\": [\"36443833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Caveolae deformation (osmotic stress) triggers relocalization of cavin-1 from the plasma membrane to the nucleus, where it promotes rRNA transcription; cavin-1 knockout cells show adaptive changes in cytosolic RNA levels and reduced ability to form stress granules, demonstrating a mechanistic link between caveolae integrity and global transcriptional/translational regulation.\",\n      \"method\": \"Osmotic stress experiments, cavin-1 knockout cell line, immunofluorescence (cavin-1 localization), cytosolic RNA measurement, stress granule/p-body imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO cell line with defined relocalization and functional transcription/RNA readouts, single lab\",\n      \"pmids\": [\"35513070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Oxidative stress triggers lipid peroxidation and caveolar disassembly, releasing CAVIN1 from caveolae; released CAVIN1 directly interacts with NRF2 and facilitates NRF2 degradation; CAVIN1-null cells show impaired negative regulation of NRF2, conferring resistance to lipid-peroxidation-induced ferroptosis; this mechanism operates in cultured cells and in vivo (Cavin1-null zebrafish).\",\n      \"method\": \"Quantitative whole-cell proteomics of genome-edited cells, co-immunoprecipitation (CAVIN1–NRF2), live-cell caveolae disassembly imaging, Cavin1-null zebrafish wound response, ferroptosis assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative proteomics in genome-edited cells, co-IP of CAVIN1-NRF2, in vivo zebrafish validation, multiple orthogonal methods\",\n      \"pmids\": [\"36858041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CAVIN1 expression level determines interindividual susceptibility to drug-induced long QT syndrome by controlling hERG channel dynamics: sotalol treatment promotes translocation of hERG from the plasma membrane to cytoskeleton-associated fractions in a CAVIN1-dependent manner; CAVIN1 knockdown reduces caveolae and abrogates hERG translocation and IKr reduction; CAVIN1 overexpression in low-sensitivity cardiomyocytes confers high sensitivity to hERG blockers.\",\n      \"method\": \"Patient-specific iPSC-derived cardiomyocytes, electrophysiology (IKr measurement), siRNA knockdown, adenoviral CAVIN1 overexpression, cellular fractionation, imaging of hERG and caveolae\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human iPSC-CM model with electrophysiology, KD and OE with reciprocal effects, cellular fractionation establishing mechanism, replicated across multiple hERG blockers\",\n      \"pmids\": [\"38682330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The Cavin-1/Caveolin-1 interaction attenuates BMP/Smad signaling: hypoxia enhances the CAV1/Cavin-1 interaction while reducing the CAV1/BMPR2 interaction and BMPR2 membrane localization in pulmonary artery endothelial cells; Cavin-1 competes with BMPR2 for binding to the CAV1 scaffolding domain, reducing Smad signal transduction; Cavin-1 knockdown is resistant to CAV1-induced pulmonary hypertension in vivo.\",\n      \"method\": \"Co-immunoprecipitation (CAV1–Cavin-1, CAV1–BMPR2), domain-binding assays (CAV1 scaffolding domain), Cavin-1 knockdown in PAECs, in vivo CAV1-induced pulmonary hypertension model\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of competing interactions plus in vivo KD model, single lab\",\n      \"pmids\": [\"38182755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cavin-1 deficiency impairs fenestration in liver sinusoidal endothelial cells (LSECs) by inhibiting the RhoA-ROCK2-LIMK-Cofilin signaling pathway and suppressing cytoskeleton dynamics; reduced LSEC fenestrae impairs hepatic glycogen metabolism leading to lethal neonatal hypoglycemia in C57BL/6J mice; treatment with the F-actin depolymerization reagent latrunculin A rescues fenestration defects.\",\n      \"method\": \"Cavin-1 knockout mice (C57BL/6J), electron microscopy of LSEC fenestrae, RhoA-ROCK2-LIMK-Cofilin pathway analysis, latrunculin A rescue experiment, glycogen/glucose measurements\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice with EM structural analysis, pathway identification, and pharmacological rescue, single lab\",\n      \"pmids\": [\"33042738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cavin-1 deficiency in mice causes muscular dystrophy characterized by constitutive Akt pathway activation, muscle hypertrophy with increased fiber size, fibrosis, impaired membrane integrity with compensatory activation of the dystrophin-glycoprotein complex, elevated muscle repair proteins, and decreased mitochondrial function and oxygen consumption.\",\n      \"method\": \"PTRF/cavin-1 null mice, exercise capacity testing, histology, western blot (Akt pathway activation, dystrophin-glycoprotein complex), mitochondrial function assays, myofiber composition analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined molecular pathways (Akt, DGC), multiple readouts, single lab\",\n      \"pmids\": [\"28289716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cavin-1 downregulation in vascular smooth muscle cells after balloon injury is mediated by proteasomal (not lysosomal) degradation; cavin-1 inhibition promotes VSMC proliferation and migration via increased ERK phosphorylation and MMP-9 activity; cavin-1 regulates caveolin-1 expression via the lysosomal degradation pathway.\",\n      \"method\": \"In vivo carotid artery balloon injury model, shRNA knockdown in vivo, proteasome/lysosome inhibitors (MG132, chloroquine), ERK phosphorylation assay, MMP-9 activity, VSMC proliferation/migration assays\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro KD with defined degradation pathway and signaling readouts, single lab\",\n      \"pmids\": [\"28751541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cavin-1 promotes M2 macrophage/microglia polarization via interaction with SOCS3; Cavin-1 and SOCS3 positively correlate during M2 polarization; Cavin-1 silencing suppresses STAT6/PPARγ pathway activation and anti-inflammatory factor release; SOCS3 overexpression reverses the inhibitory effect of Cavin-1 silencing on M2 polarization.\",\n      \"method\": \"Co-immunoprecipitation (Cavin-1–SOCS3), siRNA knockdown of Cavin-1, STAT6/PPARγ pathway analysis, RT-PCR of M2 markers\",\n      \"journal\": \"Inflammation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional KD with epistasis (SOCS3 OE rescue), single lab\",\n      \"pmids\": [\"35275225\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CAVIN1/PTRF is a dual-function cytoplasmic protein: at the plasma membrane it is an essential structural coat component of caveolae, where it binds phosphatidylserine and PI(4,5)P2 via its HR1 domain, stabilizes caveolin-1 (preventing its lateral diffusion and lysosomal degradation), forms a polyhedral net-like 60S oligomeric coat with two functionally distinct coiled-coil assembly domains, and scaffolds signaling complexes including SOCS3, MG53, hERG channels, and various receptor tyrosine kinases; in the nucleus it dissociates paused RNA Pol I ternary complexes by interacting with TTF-I, Pol I, and 3'-uridylate-containing pre-rRNA transcripts, thereby facilitating transcription termination and reinitiation; mechanosensory caveolar disassembly (triggered by osmotic stress or lipid peroxidation) releases CAVIN1 to the nucleus (where it promotes rDNA transcription) or to the cytoplasm (where it directly interacts with NRF2 to facilitate its degradation, maintaining cellular susceptibility to oxidative stress); CAVIN1 is also ubiquitinated by UBE2O and phosphorylated at Ser-36/40/365/366, regulating its activity and localization, and its interaction with paxillin at focal adhesions links metabolic stimulation (insulin) to cytoskeletal remodeling in adipocytes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CAVIN1 (PTRF) is a dual-function protein that originated as an RNA Polymerase I transcript release factor and is now established as an essential structural coat component of plasma membrane caveolae [#0, #5]. At the membrane, CAVIN1 builds caveolae by forming a flexible polyhedral net-like 60S protein mesh on phosphatidylserine-containing bilayers, using two coiled-coil domains for distinct assembly steps and a PI(4,5)P2-dependent trimeric HR1 region that adsorbs to and inserts into the membrane [#23, #32]. It is required for caveola formation and for sequestering mobile caveolin-1 into immobile caveolae, where it stabilizes caveolin-1 against lateral diffusion and lysosomal degradation post-translationally; loss of CAVIN1 in mice and humans abolishes caveolae, destabilizes all three caveolin isoforms, and causes lipodystrophy and muscle disease [#5, #6, #7, #9]. Together with caveolin-1, CAVIN1 generates a distinct caveolar lipid nano-environment selective for specific headgroups and acyl chains [#29]. CAVIN1 scaffolds and regulates signaling at caveolae, including SOCS3-dependent inhibition of IL-6/STAT3 signaling, competition with BMPR2 for the caveolin-1 scaffolding domain to attenuate BMP/Smad signaling, and control of hERG channel dynamics that determines susceptibility to drug-induced long QT syndrome [#27, #39, #38]. Mechanosensory caveolar disassembly releases CAVIN1 to other compartments: osmotic stress drives it to the nucleus where it promotes rRNA transcription, recapitulating its founding role of dissociating paused Pol I ternary complexes via interactions with TTF-I, Pol I, and 3'-uridylate-containing pre-rRNA [#0, #1, #3, #36], while lipid peroxidation releases CAVIN1 to directly bind and promote degradation of NRF2, maintaining susceptibility to oxidative-stress-induced ferroptosis [#37]. Inherited CAVIN1 mutations that mislocalize the protein and disrupt its caveolin interaction cause a human disease with deficiency of caveolae and all caveolin isoforms in muscle [#7]. CAVIN1 activity and localization are regulated post-translationally by phosphorylation at Ser-36/40/365/366 and by direct ubiquitination by UBE2O [#4, #35].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established the founding biochemical function of the protein: how paused RNA Pol I complexes are resolved to terminate transcription.\",\n      \"evidence\": \"Reconstituted in vitro termination assay with recombinant PTRF, RNA-binding assay with substrate mutagenesis, and PTRF–TTF-I/Pol I interaction assays\",\n      \"pmids\": [\"9582279\", \"10589839\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address whether this nuclear function operates in vivo under physiological conditions\", \"No structural basis for 3'-uridylate recognition\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed transcript release is coupled to reinitiation and that PTRF activity is post-translationally tunable, framing it as a regulated factor rather than a constitutive one.\",\n      \"evidence\": \"Multiple-round vs single-round Pol I transcription assays in a PTRF-free reconstituted system; phosphorylation/charge heterogeneity analysis\",\n      \"pmids\": [\"11139612\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation sites controlling transcriptional activity not mapped here\", \"Kinases responsible unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Relocated the protein to a second compartment by identifying it as a major peripheral coat protein on the cytosolic face of caveolae, mapping its phosphosites and PEST/calpain cleavage features.\",\n      \"evidence\": \"Vectorial surface proteomics with MS, confocal immunofluorescence, and phosphopeptide mapping in human adipocytes\",\n      \"pmids\": [\"15242332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether caveolar association is required for caveola formation\", \"Functional consequence of each phosphosite unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated CAVIN1 is necessary and sufficient for caveola formation and post-translationally stabilizes caveolin-1, defining its core structural role in vivo.\",\n      \"evidence\": \"FRAP, siRNA/morpholino knockdown, ectopic expression in PC3 cells, EM in mammalian cells and zebrafish; knockout mouse with metabolic phenotyping\",\n      \"pmids\": [\"18191225\", \"18840361\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of caveolin-1 stabilization not resolved at structural level\", \"Link between metabolic phenotype and specific caveolar function unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Confirmed the structural role in humans, establishing CAVIN1 loss-of-function as a cause of human caveolae/caveolin deficiency.\",\n      \"evidence\": \"Patient muscle biopsy and fibroblast EM/AFM, co-IP, and rescue by reintroduction of full-length protein\",\n      \"pmids\": [\"19726876\", \"20300641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype–phenotype relationship across mutations not detailed\", \"Tissue-specific consequences of caveola loss not fully mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mapped the molecular determinants of compartmental targeting, showing an N-terminal leucine-zipper motif is necessary and sufficient for caveolar association versus nuclear localization.\",\n      \"evidence\": \"Deletion mutants, fusion-protein targeting to histone H2A, and cavin-1 KO MEF migration rescue assays\",\n      \"pmids\": [\"25514038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signal controlling switch between nuclear and membrane pools in cells not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided the structural model of the caveolar coat, showing how CAVIN1 60S complexes build a polyhedral lattice on phosphatidylserine vesicles using two functionally distinct coiled-coil domains.\",\n      \"evidence\": \"Electron cryotomography, liposome reconstitution with purified proteins, and coiled-coil mutagenesis\",\n      \"pmids\": [\"27834731\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry with caveolin in intact caveolae not fully resolved\", \"How the coat couples to membrane curvature generation in cells\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Separated CAVIN1's nuclear transcriptional function from its caveolar role, showing it drives rDNA transcription during metabolic challenge by a caveola-independent mechanism.\",\n      \"evidence\": \"Cavin-1 KO mouse adipocytes, rRNA transcription assays, and PTM analysis under metabolic challenge\",\n      \"pmids\": [\"27528195\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which PTMs gate nuclear transcriptional activity not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined CAVIN1 as a signaling scaffold, anchoring SOCS3 at the membrane to enable inhibition of IL-6/STAT3 signaling.\",\n      \"evidence\": \"Reciprocal co-IP, confocal imaging of SOCS3 localization, SOCS3 KO cells and STAT3 phosphorylation/cAMP assays\",\n      \"pmids\": [\"29330478\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether scaffolding is caveolae-dependent not fully resolved\", \"Structural basis of CAVIN1–SOCS3 interaction unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed CAVIN1 and caveolin-1 jointly sculpt a unique caveolar lipid nano-environment, linking the coat to membrane lipid organization.\",\n      \"evidence\": \"Quantitative nanoscale lipid mapping and MD simulations in genome-edited cells\",\n      \"pmids\": [\"33496726\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequences of the lipid nano-environment for signaling not established here\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined the biophysics of membrane insertion, showing PI(4,5)P2-dependent HR1 adsorption and helix insertion with flanking disordered regions accelerating assembly.\",\n      \"evidence\": \"Model membrane biophysics, MD simulations, and cellular co-assembly assays with HR1 mutants\",\n      \"pmids\": [\"35696574\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How insertion is coupled to oligomeric lattice formation in vivo not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected caveolar mechanics to gene expression, showing caveolae deformation by osmotic stress relocalizes CAVIN1 to the nucleus to promote rRNA transcription and influence RNA/stress-granule homeostasis.\",\n      \"evidence\": \"Osmotic stress, cavin-1 KO cells, immunofluorescence localization, cytosolic RNA and stress-granule imaging\",\n      \"pmids\": [\"35513070\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative fraction of CAVIN1 mobilized to nucleus unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified direct ubiquitination by UBE2O as a regulator of CAVIN1 levels, caveola formation, and CAVIN1 secretion in exosomes.\",\n      \"evidence\": \"Endogenous/exogenous IP, in vitro ubiquitination assay, and exosome isolation/characterization\",\n      \"pmids\": [\"36443833\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination site(s) on CAVIN1 not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established a mechanosensory oxidative-stress arm, showing lipid-peroxidation-driven caveolar disassembly releases CAVIN1 to directly bind and promote NRF2 degradation, controlling ferroptosis susceptibility.\",\n      \"evidence\": \"Quantitative whole-cell proteomics of genome-edited cells, CAVIN1–NRF2 co-IP, live caveolae-disassembly imaging, and Cavin1-null zebrafish wound/ferroptosis assays\",\n      \"pmids\": [\"36858041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CAVIN1 promotes NRF2 degradation (E3 recruitment vs direct) not defined\", \"Structural basis of CAVIN1–NRF2 interaction unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked CAVIN1 expression to clinically relevant ion-channel behavior, showing it controls hERG translocation and determines individual susceptibility to drug-induced long QT syndrome.\",\n      \"evidence\": \"Patient-specific iPSC-derived cardiomyocytes, IKr electrophysiology, siRNA knockdown and adenoviral overexpression with cellular fractionation across multiple hERG blockers\",\n      \"pmids\": [\"38682330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CAVIN1 directly binds hERG or acts via caveolae not distinguished\", \"In vivo arrhythmia consequences not tested here\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single protein partitions quantitatively among its caveolar structural pool, nuclear transcriptional pool, and cytoplasmic signaling pool — and which specific PTMs and stress signals dictate this partitioning — remains unresolved.\",\n      \"evidence\": \"No single study integrates the PTM code, mechanosensory triggers, and compartmental destinations into one quantitative model\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of full-length CAVIN1 in any compartment\", \"Functional phosphosites and ubiquitination sites incompletely mapped\", \"Mechanism coupling caveolar disassembly to choice of nuclear vs cytoplasmic destination unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [5, 9, 23, 32]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [23, 29, 32]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 31]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3, 25]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [27, 24, 39]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 6, 37]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 5, 22]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 22, 36]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [13, 37]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 3, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [27, 39, 24]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [5, 6, 9, 23]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [36, 37]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [6, 19]}\n    ],\n    \"complexes\": [\"caveolar coat (60S cavin complex)\"],\n    \"partners\": [\"CAV1\", \"TTF-I\", \"SOCS3\", \"NRF2\", \"PAXILLIN\", \"CAVIN3\", \"BMPR2\", \"UBE2O\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":8,"faith_pct":87.5}}