{"gene":"POPDC1","run_date":"2026-04-28T19:45:44","timeline":{"discoveries":[{"year":1999,"finding":"BVES (blood vessel/epicardial substance, POPDC1) was identified as a novel, highly conserved transmembrane protein expressed at high levels in the developing heart, proepicardial organ, migrating epicardium, epicardial-derived mesenchyme, and smooth muscle of developing coronary arteries, suggesting a role as an early marker of vascular smooth muscle differentiation.","method":"Subtractive hybridization cloning, Northern blot, anti-Bves antibody immunostaining in chick and mouse embryos","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 3 — original discovery paper, single lab, immunolocalization with developmental context but limited functional mechanism","pmids":["10208750"],"is_preprint":false},{"year":1999,"finding":"Human BVES (hbves) maps to chromosome 6q21 and is predicted to encode a protein with three transmembrane helices, establishing POPDC1 as a multi-pass transmembrane protein conserved across chick, mouse, and human.","method":"cDNA cloning, BLAST database analysis, Northern/dot blot, computer topology prediction","journal":"Mammalian genome","confidence":"Medium","confidence_rationale":"Tier 3 — sequence analysis with expression confirmation, no direct functional assay","pmids":["10441744"],"is_preprint":false},{"year":2000,"finding":"Three Popeye (POPDC1, POPDC2, POPDC3) genes were identified as a novel vertebrate gene family encoding proteins with three conserved transmembrane domains, preferentially expressed in developing and adult striated muscle, with individual members showing distinct cardiac chamber and temporal expression patterns.","method":"cDNA library screening, chromosomal mapping, in situ hybridization, Northern blot","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 3 — gene family characterization, multiple expression methods but limited mechanistic follow-up","pmids":["10882522"],"is_preprint":false},{"year":2001,"finding":"Bves/POPDC1 is a membrane protein with three transmembrane helices confined to the lateral membrane compartment of epithelial epicardial cells; it accumulates in a perinuclear region when cells are dissociated and traffics to the cell membrane and points of cell-cell contact upon cellular contact. Transfection of Bves into non-adherent L-cells confers adhesive behavior, identifying it as a novel cell adhesion molecule. Anti-Bves antibodies inhibit epithelial migration from the proepicardium.","method":"Immunofluorescence, transfection into L-cells (adhesion assay), antibody inhibition of proepicardial cell migration in vitro","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal functional assays (adhesion gain-of-function, antibody inhibition, localization) in single study","pmids":["11493530"],"is_preprint":false},{"year":2002,"finding":"Genetic deletion of mouse Pop1/POPDC1 (null mice) impairs skeletal muscle regeneration after cardiotoxin injury, with persistence of Pop1-LacZ expression and retarded regeneration in homozygotes. Beta-adrenergic agonist (isoproterenol) treatment causes post-translational stabilization of the POPDC1 protein without transcriptional induction.","method":"LacZ knock-in null mouse, cardiotoxin muscle injury model, isoproterenol administration, LacZ staining, histology","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined regeneration phenotype; post-translational regulation demonstrated by dissociation of protein and mRNA levels","pmids":["11839816"],"is_preprint":false},{"year":2003,"finding":"The membrane topology of Bves/POPDC1 was established biochemically: the amino terminus is extracellular (glycosylated via N-linked sites), there are three transmembrane domains, and the carboxyl terminus is cytoplasmic. Bves-Bves homotypic interactions occur in the cytoplasmic compartment, mediated by the C-terminal tail.","method":"Glycosylation assays, exogenous glycosylation site insertion, co-expression of C-terminal constructs in different subcellular compartments, immunoreactivity enhancement with detergent","journal":"Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — three independent biochemical topology methods converging on same conclusion","pmids":["12815060"],"is_preprint":false},{"year":2005,"finding":"Bves/POPDC1 localizes with tight junction markers ZO-1 and occludin in polarized epithelial cells and in vivo. GST pull-down experiments demonstrate a direct physical interaction between ZO-1 and the intracellular C-terminal tail of Bves. Bves knockdown causes loss of transepithelial resistance and disruption of junction protein membrane localization, demonstrating that Bves modulates tight junction integrity.","method":"Immunolocalization with TJ markers, Ca2+ chelation/TPA treatment, GST pull-down with C-terminal Bves tail and ZO-1, siRNA knockdown with transepithelial electrical resistance measurement","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — direct pull-down identifying ZO-1 as binding partner, confirmed by functional knockdown with TJ integrity readout","pmids":["16188940"],"is_preprint":false},{"year":2007,"finding":"In Drosophila, bves (DmBves/POPDC1 homolog) expression in anterior-dorsal follicle cells is repressed by the Grk/EGFR signaling pathway during oogenesis. Loss of bves function via antisense RNA causes embryonic lethality with pole cell migration defects and abnormal germband extension, establishing bves as essential for embryonic development downstream of EGFR signaling.","method":"In situ hybridization, genetic epistasis with Grk/EGFR pathway mutants, antisense RNA expression, pole cell migration analysis","journal":"International journal of developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis in Drosophila model with defined developmental phenotype; ortholog context","pmids":["17183463"],"is_preprint":false},{"year":2008,"finding":"Bves/POPDC1 homodimerizes through an intracellular domain mapped to amino acids 268-274, with lysines 272 and 273 being essential for homodimerization and cell adhesion. Mutations at these positions abolish junctional complex formation (loss of ZO-1 and E-cadherin at membrane), reduce transepithelial electrical resistance, and promote epithelial-to-mesenchymal transition.","method":"GST pull-down, SPOTs peptide array, site-directed mutagenesis, transfection into corneal epithelial cells, TER measurement, immunofluorescence","journal":"PLoS One","confidence":"High","confidence_rationale":"Tier 1-2 — domain mapping by mutagenesis + functional validation (TER, EMT) in single study with multiple methods","pmids":["18493308"],"is_preprint":false},{"year":2008,"finding":"Bves/POPDC1 directly interacts with GEFT, a GEF for Rho-family GTPases. Exogenous Bves expression reduces Rac1 and Cdc42 activity (but not RhoA), and produces corresponding changes in cell locomotion speed and cell roundness. Bves and GEFT co-localize in adult skeletal muscle.","method":"Co-immunoprecipitation/pulldown, co-localization in adult skeletal muscle, Rac1/Cdc42/RhoA activity assays (G-LISA/pulldown), cell motility and morphology assays upon Bves overexpression","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 — reciprocal interaction confirmed, functional consequence on GTPase activity and cellular behavior demonstrated","pmids":["18541910"],"is_preprint":false},{"year":2009,"finding":"Increased Bves/POPDC1 expression in trabecular meshwork cells leads to increased tight junction formation (elevated occludin, cingulin, ZO-1), decreased RhoA activation (measured by FRET), and decreased myosin light chain phosphorylation, establishing a regulatory pathway upstream of RhoA in these cells.","method":"Stable transfection, TER measurement, FRET-based RhoA activity probe, Western blot for MLC phosphorylation","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 — clean overexpression with mechanistic downstream readouts, single lab","pmids":["19628742"],"is_preprint":false},{"year":2010,"finding":"Bves/POPDC1 directly interacts with VAMP3, a SNARE protein mediating vesicular transport, and facilitates recycling of transferrin receptor and β1-integrin. Cells expressing a mutated Bves are severely impaired in recycling of these molecules. Morpholino knockdown of Bves in Xenopus inhibits transferrin receptor recycling and causes gastrulation defects related to impaired integrin-dependent cell movements.","method":"Two independent co-immunoprecipitation/interaction assays, transferrin and integrin recycling assays, Morpholino knockdown in Xenopus laevis, kymographic analysis of cell spreading","journal":"EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — direct interaction identification with VAMP3, functional validation in vitro and in vivo (Xenopus), multiple orthogonal methods","pmids":["20057356"],"is_preprint":false},{"year":2011,"finding":"BVES/POPDC1 regulates tight junction formation and suppresses EMT in human corneal and colon cancer cells. BVES reexpression in colorectal carcinoma cells promotes epithelial phenotype, decreases proliferation/migration/invasion, and blocks metastasis in orthotopic xenografts. Expression of a dominant-negative BVES mutant induces mesenchymal features in corneal epithelial cells.","method":"Re-expression in CRC cell lines, dominant-negative mutant expression, orthotopic xenograft mouse model, cell migration/invasion/proliferation assays, AJ/TJ composition analysis","journal":"Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — gain- and loss-of-function in vitro plus in vivo xenograft model with defined phenotypic readouts","pmids":["21911938"],"is_preprint":false},{"year":2011,"finding":"Bves/POPDC1 modulates RhoA activation and ZONAB/DbpA transcriptional activity through its regulatory effect on tight junction formation; C-terminus truncated Bves disrupts ZO-1 interaction, causes loss of TJ protein localization, increases RhoA activity (30% increase by FRET), and increases ZONAB/DbpA transcriptional activity.","method":"Stable transfection of full-length vs. C-terminus truncated Bves, TER measurement, FRET-based RhoA activity, luciferase reporter for ZONAB/DbpA transcriptional activity, immunofluorescence","journal":"PLoS One","confidence":"Medium","confidence_rationale":"Tier 2 — domain-function analysis with multiple mechanistic readouts, single lab","pmids":["21283798"],"is_preprint":false},{"year":2012,"finding":"Popeye domain-containing proteins (POPDC1 and POPDC2) are essential regulators of cardiac pacemaking under stress. The conserved Popeye domain functions as a high-affinity cAMP-binding site. POPDC proteins interact with the potassium channel TREK-1, increasing its cell surface expression and current density; both effects are negatively modulated by cAMP. POPDC1 or POPDC2 knockout mice develop stress-induced sinus node dysfunction and age-dependent bradyarrhythmia.","method":"Popdc1/Popdc2 knockout mice, ECG telemetry under stress, cAMP-binding assays (competitive binding with radiolabeled cAMP), co-immunoprecipitation with TREK-1, electrophysiology (current density measurements), cell surface expression assays","journal":"Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 — reconstituted cAMP binding, co-IP with TREK-1, functional electrophysiology, in vivo KO phenotype; replicated across POPDC1 and POPDC2","pmids":["22354168"],"is_preprint":false},{"year":2012,"finding":"Bves/POPDC1 knockdown in zebrafish disrupts atypical PKC (aPKC) localization at cell junctions and affects the PAR junctional complex (par-3, par-6, prkci/aPKC), leading to loss of epidermal barrier function and osmotic sensitivity. Rescue experiments with ZO-2, par-3, par-6, and aPKC mRNAs partially restore survival, establishing that Bves acts upstream of the PAR complex at the tight junction.","method":"Morpholino knockdown in zebrafish, osmotic stress assay, mRNA rescue experiments, immunofluorescence for aPKC and claudins","journal":"Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — in vivo epistasis via mRNA rescue in zebrafish identifies PAR complex as downstream effectors","pmids":["23019331"],"is_preprint":false},{"year":2013,"finding":"POPDC1/Bves is a caveolae-associated protein that co-localizes and co-immunoprecipitates with caveolin-3 at the sarcolemma, intercalated discs, and T-tubules. POPDC1-null hearts show a 70% reduction in caveolae number, impaired Ca2+ transients, increased vulnerability to oxidative stress, no pharmacological preconditioning, and greater ischemia/reperfusion injury with larger infarct size, indicating POPDC1 is required for caveolae structural and functional integrity.","method":"Co-immunoprecipitation and co-sedimentation in density gradients (caveolae isolation), electron microscopy (caveolae quantification), confocal co-localization, Ca2+ transient measurements, Langendorff heart perfusion with I/R injury","journal":"PLoS One","confidence":"High","confidence_rationale":"Tier 2 — biochemical interaction with caveolin-3 confirmed by multiple methods, KO mice with multiple functional readouts","pmids":["24066022"],"is_preprint":false},{"year":2013,"finding":"A novel protein-protein interaction between Bves/POPDC1 and NDRG4 is required for autocrine ECM deposition and epicardial cell directional movement. The Bves/NDRG4 interaction is required for fibronectin recycling through the autocrine ECM pathway, and TIRFM shows the interaction is needed for fusion of recycling endosomes with the basal cell surface.","method":"Co-immunoprecipitation, siRNA disruption, fibronectin recycling assay, total internal reflectance fluorescence microscopy (TIRFM), directional migration assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — novel interaction identified and functionally validated with multiple readouts including live imaging and migration quantification","pmids":["24048452"],"is_preprint":false},{"year":2015,"finding":"A homozygous missense mutation POPDC1(S201F) causes cardiac arrhythmia and limb-girdle muscular dystrophy. The S201F variant displays a 50% reduction in cAMP-binding affinity. In patient skeletal muscle, both POPDC1(S201F) and WT POPDC2 show impaired membrane trafficking. Expression of POPDC1(S201F) in HL-1 cardiac cells increases hyperpolarization and action potential upstroke velocity. The homologous zebrafish mutation (popdc1S191F) recapitulates heart and skeletal muscle phenotypes.","method":"Whole-exome sequencing, cAMP-binding affinity assay, immunofluorescence of patient muscle biopsies, electrophysiology in HL-1 cells, zebrafish knock-in model","journal":"Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1-2 — direct cAMP-binding assay with mutagenesis, electrophysiology, patient tissue analysis, and zebrafish model all converging","pmids":["26642364"],"is_preprint":false},{"year":2016,"finding":"BVES/POPDC1 interacts with PR61α (a PP2A regulatory subunit) to mediate c-Myc destruction. Loss of Bves in mouse colitis-associated cancer model leads to increased c-Myc levels, Wnt activation, and increased tumor multiplicity. The BVES-PP2A interaction was identified by yeast two-hybrid screen.","method":"Yeast two-hybrid screen, co-immunoprecipitation, AOM/DSS mouse colitis-cancer model, immunohistochemistry, Western blot for c-Myc","journal":"Gut","confidence":"Medium","confidence_rationale":"Tier 2-3 — yeast two-hybrid plus co-IP for interaction, in vivo KO model with c-Myc readout; mechanism not fully reconstituted","pmids":["28389570"],"is_preprint":false},{"year":2016,"finding":"Popdc1/BVES siRNA-mediated knockdown in cardiomyocytes under serum deprivation causes cell injury and death, upregulation of pro-apoptotic Bnip3, and reduction of Rac1-GTPase activity and Akt phosphorylation. Combined POPDC1/Bnip3 silencing attenuates this injury. Chromatin immunoprecipitation showed increased FoxO3 binding to the Bnip3 promoter and decreased NFκB nuclear presence in POPDC1-deficient cardiomyocytes.","method":"siRNA knockdown, cell viability assays, Western blot (Bnip3, Rac1-GTP, pAkt), chromatin immunoprecipitation (FoxO3 and NFκB at Bnip3 promoter), combined double-knockdown","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — defined molecular pathway (POPDC1→Rac1/Akt→FoxO3/NFκB→Bnip3) with ChIP and double-knockdown validation, single lab","pmids":["27886395"],"is_preprint":false},{"year":2016,"finding":"BVES/POPDC1 regulates intestinal stem cell programs; Bves-/- mice show expanded crypt height, elevated Lgr5 stem cell marker, and increased proliferation. Bves-/- enteroids show increased stemness, amplified Wnt signaling, and responsiveness to Wnt activation. After radiation, Bves-/- mice show greater crypt viability and amplified Wnt signaling, identifying BVES as a negative regulator of Wnt-dependent intestinal stem cell programs.","method":"Bves KO mice, Lgr5-EGFP reporter intercross, 3D enteroid culture, proliferation and stem cell marker analysis, Wnt pathway activation assays, radiation injury model","journal":"Stem cells","confidence":"High","confidence_rationale":"Tier 2 — multiple in vitro and in vivo readouts in KO model with stem cell and Wnt pathway mechanistic linkage","pmids":["26891025"],"is_preprint":false},{"year":2017,"finding":"POPDC1 is negatively regulated by EGFR signaling in breast cancer cells; EGFR activation reduces POPDC1 expression, and POPDC1 overexpression attenuates EGF-mediated cell migration and proliferation in MCF7, MDA231 and SKBR3 cells. Functional suppression of POPDC1 promotes breast cancer cell migration and proliferation, while cAMP upregulates POPDC1 expression.","method":"EGFR inhibitor/activator treatment with Western blot for POPDC1, POPDC1 overexpression and siRNA knockdown, EGF-stimulated migration and proliferation assays, cAMP treatment","journal":"Cancer letters / Bioscience reports","confidence":"Medium","confidence_rationale":"Tier 3 — functional cell-line studies with defined pathway, but mechanistic linkage between EGFR and POPDC1 is partially characterized","pmids":["28807821","28954821"],"is_preprint":false},{"year":2020,"finding":"POPDC1 and POPDC2 interact with XIRP1 (Xin actin-binding repeat-containing protein 1) in human skeletal myotubes, confirmed by proteomic pull-down and co-immunoprecipitation from adult rat heart. Both XIRP1 and POPDC1/2 localize together at intercalated discs and T-tubules in human and rat heart.","method":"Bead-based pull-down with proteomic analysis (mass spectrometry), co-immunoprecipitation from rat heart, immunofluorescence with new monoclonal antibodies in human skeletal muscle and cardiac tissue","journal":"BMC molecular and cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — MS-identified interaction confirmed by co-IP, localization consistent; functional consequence not established in same study","pmids":["33261556"],"is_preprint":false},{"year":2021,"finding":"ANO5 and BVES/POPDC1 directly interact; the N-terminus of ANO5 mediates interaction with the C-terminus of BVES. Both proteins co-localize at the ER membrane in muscle cells. Genome editing-mediated deletion of either ANO5 or BVES significantly suppresses C2C12 myoblast differentiation with little effect on proliferation, placing BVES in the same functional pathway as ANO5 in myogenesis.","method":"BioID2 proximity labeling with mass spectrometry, co-immunoprecipitation, domain-mapping co-IP with truncation mutants, CRISPR/Cas9 knockout, myoblast differentiation assays","journal":"Cell & bioscience","confidence":"High","confidence_rationale":"Tier 2 — proximity labeling + co-IP domain mapping + KO functional phenotype, convergent methods","pmids":["34963485"],"is_preprint":false},{"year":2022,"finding":"POPDC1 scaffolds a macromolecular complex containing adenylyl cyclase 9 (AC9) and the potassium channel TREK-1 in the heart. TREK-1 binds the AC9:POPDC1 complex and co-purifies in a POPDC1-dependent manner with AC9 activity. The AC9:POPDC1 interaction is cAMP-independent, but TREK-1 association with the complex is reduced upon β-adrenergic receptor stimulation in an AC9 activity-dependent manner. Deletion of AC9 causes bradycardia and stress-induced heart rate variability.","method":"Co-immunoprecipitation, co-purification with AC9 activity measurements, TREK-1 current recordings in transfected cells, AC9 knockout mice (ECG telemetry), β-adrenergic stimulation experiments","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — biochemical complex identification with functional electrophysiology and in vivo KO phenotype; AC9 activity requirement demonstrated by pharmacology","pmids":["36254885"],"is_preprint":false},{"year":2022,"finding":"In POPDC1-KO hippocampal slices, CA1 long-term potentiation (LTP) is enhanced in a PKA-dependent manner in response to weaker stimulation paradigms. POPDC1 is widely expressed in brain regions including hippocampus. Loss of POPDC1 enhances forskolin-induced potentiation without affecting basal transmission. These findings identify POPDC1 as a novel negative regulator of hippocampal synaptic plasticity through cAMP-PKA signaling.","method":"Popdc1 KO mice, acute hippocampal slice electrophysiology (field recordings), pharmacological PKA inhibition, forskolin-induced potentiation assays","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined electrophysiological phenotype and pharmacological pathway validation, single lab","pmids":["34937090"],"is_preprint":false},{"year":2022,"finding":"POPDC1 mutations causing LGMDR25 show differential effects on heteromeric POPDC1-POPDC2 complex formation and membrane trafficking. POPDC proteins interact through a helix-helix interface at the C-terminus of the Popeye domain. Ultra-conserved hydrophobic residues at this interface are required for membrane trafficking of the POPDC1-POPDC2 complex; mutations impairing complex formation cause greater trafficking defects than mutations that preserve interaction.","method":"Co-precipitation, proximity ligation assay, bioluminescence resonance energy transfer (BRET), bimolecular fluorescence complementation (BiFC), site-directed mutagenesis of conserved hydrophobic residues, immunostaining of patient biopsies","journal":"Acta neuropathologica communications","confidence":"High","confidence_rationale":"Tier 1-2 — domain mapped by mutagenesis, interaction confirmed by four independent methods (co-IP, PLA, BRET, BiFC), functionally linked to membrane trafficking","pmids":["36624536"],"is_preprint":false},{"year":2023,"finding":"BVES/POPDC1 functions as a negative feedback regulator of adenylyl cyclase 9 (ADCY9)-mediated cAMP signaling in skeletal muscle. BVES interacts with and negatively regulates ADCY9 activity. BVES deletion increases PKA signaling, promoting FoxO-mediated ubiquitin-proteasome degradation and autophagy initiation, leading to reduced muscle mass and impaired performance. Viral re-expression of BVES in Bves-deficient muscle reverses these defects.","method":"BVES KO mice, AAV-mediated BVES re-expression, co-immunoprecipitation with ADCY9, cAMP/PKA activity assays, proteolysis and autophagy pathway Western blots, muscle mass/strength/exercise performance measures","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — interaction with ADCY9 demonstrated, functional rescue by viral re-expression, defined downstream pathway (PKA→FoxO→proteasome/autophagy); multiple orthogonal methods","pmids":["36997581"],"is_preprint":false},{"year":2022,"finding":"BVES/POPDC1 co-localizes with ZO-1 and GEFT in HCC cells, regulates ZO-1 expression and localization and GEFT distribution, and thereby modulates RhoA activity. BVES overexpression decreases HCC cell extrusion in vitro and in vivo (orthotopic xenograft), and BVES suppression enhances tumor cell extrusion, promoting HCC metastasis.","method":"Co-immunoprecipitation, RhoA activity assay, silicone chamber and 3D cell culture extrusion models, orthotopic xenograft mouse model, immunofluorescence","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP interaction confirmed and in vivo extrusion model, mechanistic pathway partially characterized","pmids":["36123685"],"is_preprint":false},{"year":2022,"finding":"Systemic AAV9-mediated delivery of human BVES to BVES-KO mice restores POPDC1 in cardiac and skeletal muscle and rescues body weight, muscle mass, muscle strength, exercise performance, and stress-induced heart rate abnormality. Intravenous delivery to adult KO mice after disease onset also provides substantial improvement, establishing BVES gene replacement as a viable therapeutic approach for LGMDR25.","method":"AAV9 vector systemic delivery in neonatal and adult KO mice, grip strength, treadmill exercise, histopathology, ECG under stress","journal":"Molecular therapy","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo gene rescue with multiple functional readouts, establishing causal role of BVES in disease","pmids":["36433649"],"is_preprint":false},{"year":2022,"finding":"Bves/POPDC1 maintains the VSMC contractile phenotype through Dusp1 (dual-specificity protein phosphatase 1)-dependent suppression of p38MAPK and ERK1/2 signaling. Bves knockdown reduces Dusp1 expression and enhances p38MAPK and ERK1/2 activation; in vivo, VSMC-specific Bves and Dusp1 overexpression attenuates neointimal lesion formation in a rat graft arteriosclerosis model.","method":"In vivo rat graft arteriosclerosis model, RNA sequencing identifying Dusp1 correlation, siRNA knockdown and overexpression, p38MAPK/ERK1/2 phosphorylation Western blot, VSMC phenotypic marker analysis","journal":"Atherosclerosis","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptomic and functional linkage of BVES→Dusp1→MAPK pathway validated in vitro and in vivo","pmids":["36037759"],"is_preprint":false},{"year":2024,"finding":"POPDC1 dysfunction in popdc1(S201F) and popdc1 KO zebrafish alters cardiac electrophysiology including heart rate, AV delay, action potential and calcium transient upstroke speed and duration. SNS stress by β-adrenergic stimulation increases AV delay and leads to AV block in popdc1 mutant adult hearts, while reducing AP and CaT duration; arrhythmogenic effects are present from early development.","method":"Homozygous popdc1 and KO zebrafish larvae and adult isolated hearts, functional fluorescent analysis (AP and Ca2+ transient imaging), isoproterenol (β-AR) stimulation","journal":"Genes","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo zebrafish model with multiple electrophysiological readouts, both developmental stages examined","pmids":["38540339"],"is_preprint":false},{"year":2020,"finding":"BVES knockdown in zebrafish decreases expression of second heart field (SHF) regulatory genes NKX2.5, GATA4, and HAND2, and causes ventricular outflow tract stenosis and looping defects, partially rescued by bves mRNA and partially by nkx2.5 mRNA. Dual-fluorescence reporter assays show BVES positively regulates transcriptional activity of GATA4, NKX2.5, and HAND2 promoters.","method":"Zebrafish morpholino knockdown and mRNA rescue, reporter assay for transcription factor promoters, qPCR for SHF gene expression, cardiac morphology imaging","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis via rescue in zebrafish with promoter-reporter mechanistic data, single lab","pmids":["32843646"],"is_preprint":false}],"current_model":"POPDC1 (BVES) is a plasma membrane-localized, three-transmembrane-domain protein that binds cAMP with high affinity through its conserved Popeye domain; it scaffolds a macromolecular complex with adenylyl cyclase 9 (AC9) and the TREK-1 potassium channel to regulate heart rate and cardiac pacemaking, interacts with VAMP3 to facilitate receptor/integrin recycling, binds ZO-1 and caveolin-3 to maintain tight junction and caveolae integrity, suppresses Rac1/Cdc42 activity via GEFT, negatively regulates ADCY9-cAMP-PKA-FoxO signaling to maintain skeletal muscle mass, interacts with POPDC2 through a helix-helix interface at the Popeye domain C-terminus for membrane trafficking, and acts as a tumour suppressor by promoting epithelial phenotype and c-Myc degradation via PP2A."},"narrative":{"teleology":[{"year":1999,"claim":"Identification of POPDC1 as a conserved transmembrane protein enriched in developing heart and epicardium established it as a candidate cardiac/vascular differentiation marker whose function was unknown.","evidence":"Subtractive hybridization cloning with in situ and Northern blot in chick and mouse embryos; chromosomal mapping and topology prediction in human","pmids":["10208750","10441744"],"confidence":"Medium","gaps":["No functional assay performed","Three-TM topology was predicted, not biochemically confirmed"]},{"year":2001,"claim":"Demonstration that POPDC1 localizes to lateral membranes at cell-cell contacts and confers adhesive behavior when expressed in non-adherent cells established it as a novel cell adhesion molecule required for epicardial cell migration.","evidence":"L-cell adhesion gain-of-function assay, antibody inhibition of proepicardial migration, immunofluorescence in polarized epithelial cells","pmids":["11493530"],"confidence":"High","gaps":["Binding partner mediating adhesion unknown","Mechanism of adhesion (homophilic vs. heterophilic) not resolved"]},{"year":2003,"claim":"Biochemical resolution of POPDC1 membrane topology (extracellular N-terminus, three TM helices, cytoplasmic C-terminus) and identification of C-terminal-mediated homodimerization provided a structural framework for understanding how it organizes signaling complexes.","evidence":"N-linked glycosylation assays, engineered glycosylation sites, co-expression of C-terminal fragments, detergent permeabilization","pmids":["12815060"],"confidence":"High","gaps":["Atomic structure of the Popeye domain not determined","Stoichiometry of homodimer unknown"]},{"year":2005,"claim":"Discovery of a direct ZO-1 interaction and the requirement for POPDC1 in maintaining transepithelial resistance linked POPDC1 to tight junction regulation, answering how a transmembrane adhesion molecule connects to junctional signaling.","evidence":"GST pull-down of ZO-1 with POPDC1 C-terminus, siRNA knockdown with TER measurement, co-localization with ZO-1 and occludin","pmids":["16188940"],"confidence":"High","gaps":["Binding site on ZO-1 not mapped","Whether POPDC1 recruits ZO-1 or stabilizes existing complexes unclear"]},{"year":2008,"claim":"Mapping of the homodimerization motif (aa 268–274, K272/K273) and identification of GEFT as a binding partner that mediates Rac1/Cdc42 suppression revealed how POPDC1 integrates junction assembly with Rho-family GTPase signaling.","evidence":"SPOTs peptide array mutagenesis, TER and EMT readouts for dimerization mutants; co-IP of GEFT with Rac1/Cdc42 activity assays","pmids":["18493308","18541910"],"confidence":"High","gaps":["Whether GEFT and ZO-1 bind simultaneously or competitively not tested","RhoA regulation showed conflicting directions across cell types (suppressed vs. enhanced depending on context)"]},{"year":2010,"claim":"Identification of VAMP3 as a direct POPDC1 partner and demonstration that POPDC1 is required for transferrin receptor and β1-integrin recycling established POPDC1 as a regulator of vesicular trafficking, explaining its role in cell migration and gastrulation.","evidence":"Co-immunoprecipitation with VAMP3, transferrin and integrin recycling assays, Xenopus morpholino knockdown with gastrulation phenotype","pmids":["20057356"],"confidence":"High","gaps":["Whether POPDC1 acts as cargo adaptor or fusion factor not resolved","Connection between VAMP3-mediated recycling and tight junction maintenance not explored"]},{"year":2012,"claim":"The breakthrough discovery that the Popeye domain is a high-affinity cAMP-binding module and that POPDC1 regulates TREK-1 channel surface expression in a cAMP-dependent manner, with knockout mice developing stress-induced sinus bradycardia, unified POPDC1's molecular identity as a cAMP effector controlling cardiac pacemaking.","evidence":"Competitive radiolabeled cAMP-binding assays, co-IP with TREK-1, electrophysiology, Popdc1 and Popdc2 KO mice with ECG telemetry","pmids":["22354168"],"confidence":"High","gaps":["Crystal structure of Popeye domain–cAMP complex unavailable","Whether POPDC1 directly gates TREK-1 or acts through trafficking only not fully resolved"]},{"year":2013,"claim":"Discovery that POPDC1 co-immunoprecipitates with caveolin-3 and is required for caveolae biogenesis (70% reduction in KO hearts) explained how POPDC1 loss increases cardiac vulnerability to ischemia/reperfusion injury.","evidence":"Co-IP and density-gradient co-sedimentation with caveolin-3, electron microscopy of caveolae, Langendorff I/R injury model in KO mice","pmids":["24066022"],"confidence":"High","gaps":["Whether caveolae loss is cause or consequence of POPDC1 absence not distinguished","Stoichiometry and direct binding site between POPDC1 and caveolin-3 not mapped"]},{"year":2015,"claim":"Identification of a homozygous POPDC1(S201F) mutation in patients with cardiac arrhythmia and limb-girdle muscular dystrophy (LGMDR25), with 50% reduced cAMP affinity and impaired membrane trafficking of POPDC1-POPDC2 complexes, provided the first human genetic proof that POPDC1 cAMP-binding is essential for striated muscle and cardiac function.","evidence":"Whole-exome sequencing in patient family, cAMP-binding affinity assays, patient muscle immunofluorescence, HL-1 electrophysiology, zebrafish knock-in model","pmids":["26642364"],"confidence":"High","gaps":["Whether S201F fully phenocopies null or is hypomorphic not resolved","Genotype-phenotype correlation across different POPDC1 mutations incomplete"]},{"year":2016,"claim":"Studies in intestinal epithelium and colitis-associated cancer demonstrated that POPDC1 negatively regulates Wnt-driven intestinal stem cell programs and promotes c-Myc degradation through PP2A, establishing a tumour-suppressive mechanism operating through two distinct pathways.","evidence":"Bves KO mice with Lgr5-EGFP reporter, 3D enteroid culture, AOM/DSS cancer model, yeast two-hybrid identification of PP2A interaction, c-Myc Western blot","pmids":["26891025","28389570"],"confidence":"High","gaps":["How POPDC1-PP2A interaction is regulated by cAMP not tested","Whether Wnt suppression and c-Myc degradation are mechanistically linked or parallel not clarified"]},{"year":2022,"claim":"Reconstitution of the POPDC1–AC9–TREK-1 macromolecular complex showed that POPDC1 scaffolds AC9 independently of cAMP while β-adrenergic stimulation triggers AC9-dependent release of TREK-1, providing a detailed mechanism for how the sinoatrial pacemaker integrates sympathetic input.","evidence":"Co-purification with AC9 activity, TREK-1 current recordings, AC9 KO mice with ECG telemetry, β-adrenergic stimulation","pmids":["36254885"],"confidence":"High","gaps":["Structural basis for AC9–POPDC1 interaction not resolved","Whether this ternary complex exists in non-cardiac tissues unknown"]},{"year":2022,"claim":"Mapping of the POPDC1-POPDC2 heteromeric interface to conserved hydrophobic residues at the Popeye domain C-terminus, using four independent interaction methods, revealed that disease-causing mutations disrupting this interface impair membrane trafficking more severely than those preserving it.","evidence":"Co-IP, PLA, BRET, BiFC with site-directed mutagenesis of conserved hydrophobic residues; patient biopsy immunostaining","pmids":["36624536"],"confidence":"High","gaps":["Atomic-resolution structure of POPDC1-POPDC2 heterodimer unavailable","Whether POPDC3 uses the same interface not tested"]},{"year":2023,"claim":"Demonstration that POPDC1 negatively regulates ADCY9-cAMP-PKA signaling in skeletal muscle and that its loss activates FoxO-mediated proteolysis and autophagy causing muscle wasting—reversible by AAV-BVES gene replacement—defined the molecular basis of LGMDR25 muscle pathology.","evidence":"BVES KO mice, co-IP with ADCY9, cAMP/PKA activity assays, FoxO/proteasome/autophagy pathway analysis, AAV-mediated rescue of muscle mass and function","pmids":["36997581"],"confidence":"High","gaps":["Whether POPDC1 directly inhibits AC9 catalytic activity or sequesters substrate not distinguished","Relative contributions of proteasome vs. autophagy to muscle loss not quantified"]},{"year":null,"claim":"Key unresolved questions include the atomic structure of the Popeye domain in complex with cAMP and partner proteins, the mechanistic basis for tissue-specific regulation of Rho GTPases versus cAMP/PKA pathways, and whether the diverse functions (junction maintenance, vesicular recycling, pacemaking, tumour suppression) are cAMP-dependent or represent cAMP-independent scaffolding roles.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of the Popeye domain available","cAMP-dependence of ZO-1, VAMP3, and PP2A interactions not tested","Systematic interactome across tissues not performed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[11,14,25]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[9,14,25,28]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[3,6,8]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5,14,16,27]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[11,17]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[14,25,26,28]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[14,25,32]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[6,8,15]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[11,17]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[18,27,30]}],"complexes":["POPDC1-AC9-TREK-1 pacemaker complex","POPDC1-POPDC2 heterodimer"],"partners":["KCNK2","ADCY9","POPDC2","TJP1","VAMP3","GEFT","CAV3","XIRP1"],"other_free_text":[]},"mechanistic_narrative":"POPDC1 (BVES) is a three-transmembrane-domain protein that functions as a high-affinity cAMP effector, scaffolding adaptor, and regulator of cell junction integrity in striated muscle, epithelial tissues, and the cardiac conduction system. Its conserved cytoplasmic Popeye domain binds cAMP and nucleates a macromolecular complex with adenylyl cyclase 9 (AC9) and the TREK-1 potassium channel, thereby coupling β-adrenergic signaling to cardiac pacemaker activity; knockout or loss-of-function mutations cause stress-induced sinus node dysfunction, AV block, and limb-girdle muscular dystrophy (LGMDR25) [PMID:22354168, PMID:26642364, PMID:36254885]. POPDC1 additionally maintains epithelial barrier integrity by interacting with ZO-1 and organizing the PAR polarity complex, suppresses Rho-family GTPase signaling through GEFT, facilitates VAMP3-dependent vesicular recycling of integrins and receptors, and negatively regulates ADCY9-cAMP-PKA-FoxO signaling to preserve skeletal muscle mass [PMID:16188940, PMID:18541910, PMID:20057356, PMID:36997581]. In intestinal and cancer epithelia, POPDC1 acts as a tumour suppressor by restraining Wnt/β-catenin-driven stemness and promoting c-Myc degradation via PP2A [PMID:26891025, PMID:28389570, PMID:21911938]."},"prefetch_data":{"uniprot":{"accession":"Q8NE79","full_name":"Popeye domain-containing protein 1","aliases":[],"length_aa":360,"mass_kda":41.5,"function":"Cell adhesion molecule involved in the establishment and/or maintenance of cell integrity. Involved in the formation and regulation of the tight junction (TJ) paracellular permeability barrier in epithelial cells (PubMed:16188940). Plays a role in VAMP3-mediated vesicular transport and recycling of different receptor molecules through its interaction with VAMP3. Plays a role in the regulation of cell shape and movement by modulating the Rho-family GTPase activity through its interaction with ARHGEF25/GEFT. Induces primordial adhesive contact and aggregation of epithelial cells in a Ca(2+)-independent manner. Also involved in striated muscle regeneration and repair and in the regulation of cell spreading (By similarity). Important for the maintenance of cardiac function. Plays a regulatory function in heart rate dynamics mediated, at least in part, through cAMP-binding and, probably, by increasing cell surface expression of the potassium channel KCNK2 and enhancing current density (PubMed:26642364). Is also a caveolae-associated protein important for the preservation of caveolae structural and functional integrity as well as for heart protection against ischemia injury","subcellular_location":"Lateral cell membrane; Cell junction, tight junction; Membrane; Cell membrane, sarcolemma; Membrane, caveola","url":"https://www.uniprot.org/uniprotkb/Q8NE79/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/POPDC1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CCDC47","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/POPDC1","total_profiled":1310},"omim":[{"mim_id":"616812","title":"MUSCULAR DYSTROPHY, LIMB-GIRDLE, AUTOSOMAL RECESSIVE 25; LGMDR25","url":"https://www.omim.org/entry/616812"},{"mim_id":"605824","title":"POPEYE DOMAIN-CONTAINING PROTEIN 3; POPDC3","url":"https://www.omim.org/entry/605824"},{"mim_id":"605823","title":"POPEYE DOMAIN-CONTAINING PROTEIN 2; POPDC2","url":"https://www.omim.org/entry/605823"},{"mim_id":"604577","title":"POPEYE DOMAIN cAMP EFFECTOR 1; POPDC1","url":"https://www.omim.org/entry/604577"}],"hpa":{"profiled":true,"resolved_as":"BVES","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cell Junctions","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"heart muscle","ntpm":26.0},{"tissue":"skeletal muscle","ntpm":41.0},{"tissue":"tongue","ntpm":27.3}],"url":"https://www.proteinatlas.org/search/BVES"},"hgnc":{"alias_symbol":["POP1","HBVES"],"prev_symbol":["BVES"]},"alphafold":{"accession":"Q8NE79","domains":[{"cath_id":"-","chopping":"37-116","consensus_level":"high","plddt":91.3216,"start":37,"end":116},{"cath_id":"2.60.120.10","chopping":"126-267","consensus_level":"high","plddt":91.6265,"start":126,"end":267}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NE79","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NE79-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NE79-F1-predicted_aligned_error_v6.png","plddt_mean":75.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=POPDC1","jax_strain_url":"https://www.jax.org/strain/search?query=POPDC1"},"sequence":{"accession":"Q8NE79","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NE79.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NE79/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NE79"}},"corpus_meta":[{"pmid":"7585963","id":"PMC_7585963","title":"pop-1 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inclusions.","date":"2024","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/39079530","citation_count":20,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"28675297","id":"PMC_28675297","title":"A Human Tyrosine Phosphatase Interactome Mapped by Proteomic Profiling.","date":"2017","source":"Journal of proteome research","url":"https://pubmed.ncbi.nlm.nih.gov/28675297","citation_count":19,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32460013","id":"PMC_32460013","title":"MKRN2 Physically Interacts with GLE1 to Regulate mRNA Export and Zebrafish Retinal Development.","date":"2020","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/32460013","citation_count":14,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"40355756","id":"PMC_40355756","title":"The solute carrier superfamily interactome.","date":"2025","source":"Molecular systems 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POR","url":"https://pubmed.ncbi.nlm.nih.gov/22109561","citation_count":5,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":44501,"output_tokens":6124,"usd":0.112682},"stage2":{"model":"claude-opus-4-6","input_tokens":9702,"output_tokens":3744,"usd":0.213165},"total_usd":0.730099,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":55116,"output_tokens":11110,"usd":0.165999},"round2_rules_fired":"R2","round2_stage2":{"model":"claude-opus-4-6","input_tokens":13142,"output_tokens":3725,"usd":0.238253}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"POPDC1 (Bves) is a membrane protein with three transmembrane helices expressed in cells of the developing coronary vascular system; it localizes to the lateral membrane compartment of epithelial cells, traffics to cell-cell contact sites upon cell-cell contact, accumulates at filopodia and cell borders before E-cadherin, and confers adhesive behavior when transfected into non-adherent L-cells, identifying it as a novel cell adhesion molecule.\",\n      \"method\": \"Anti-Bves antibody immunostaining, subcellular fractionation, transfection of L-cells, morphological analysis of proepicardial cells in vitro\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (immunostaining, L-cell adhesion assay, in vitro trafficking); replicated across two independent labs (Reese et al. 1999 and Wada et al. 2001)\",\n      \"pmids\": [\"10208750\", \"11493530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The membrane topology of Bves/Pop1A consists of an extracellular amino terminus (N-terminus), three transmembrane domains, and a cytoplasmic carboxyl terminus; the N-terminus contains two asparagine-linked glycosylation sites and is glycosylated; Bves-Bves interactions occur in the cytoplasm through the carboxyl terminus.\",\n      \"method\": \"Glycosylation assays, exogenous glycosylation-site insertion, co-expression of full-length and soluble carboxyl-terminal constructs, immunoreactivity assays with/without detergent on epicardial cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — three biochemically independent approaches establishing topology; single study with rigorous controls\",\n      \"pmids\": [\"12815060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Bves localizes with ZO-1 and occludin at tight junctions in polarized epithelial cells; GST pull-down experiments show a direct interaction between ZO-1 and the intracellular C-terminal tail of Bves; Bves knockdown causes loss of transepithelial resistance and junction protein membrane localization, demonstrating that Bves modulates tight junction integrity.\",\n      \"method\": \"Co-localization immunofluorescence, GST pull-down, Bves knockdown (siRNA) with transepithelial resistance measurement, Ca2+-switch and TPA treatment assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction mapped by pull-down, functional KD with specific TJ readouts; multiple orthogonal methods in single study\",\n      \"pmids\": [\"16188940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Bves directly interacts with GEFT (a GEF for Rho-family GTPases); exogenous Bves expression reduces Rac1 and Cdc42 activity levels without affecting RhoA, producing changes in cell locomotion speed and cell roundness consistent with repression of Rac1/Cdc42 signaling.\",\n      \"method\": \"Co-localization, protein-protein interaction assay (Bves-GEFT), Rho-family GTPase activity assays (pulldown), cell motility/morphology analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct physical interaction demonstrated plus functional GTPase activity assay; Moderate strength with multiple orthogonal readouts\",\n      \"pmids\": [\"18541910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Bves self-interacts through an intracellular domain (amino acids 268–274, specifically lysines 272 and 273) essential for homodimerization and intercellular adhesion; mutation at these positions abolishes tight junction formation, reduces ZO-1 and E-cadherin membrane localization, and induces epithelial-to-mesenchymal transition.\",\n      \"method\": \"GST pull-down, SPOTs analysis, site-directed mutagenesis, transepithelial electrical resistance measurement, immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution of interaction domain mapped by GST pull-down + mutagenesis + functional cellular readout; multiple methods in single study\",\n      \"pmids\": [\"18493308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Bves directly interacts with VAMP3, a SNARE protein; cells expressing mutated Bves are impaired in recycling of transferrin receptor and β1-integrin; Morpholino knockdown of Bves in Xenopus specifically inhibits transferrin receptor recycling and causes gastrulation defects; Bves-depleted cells show impaired spreading and adhesion on fibronectin. This establishes Bves as a regulator of vesicular transport and SNARE function.\",\n      \"method\": \"Co-immunoprecipitation, in vitro receptor recycling assay, Morpholino knockdown in Xenopus, kymographic analysis of cell spreading/adhesion\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction plus in vitro and in vivo functional validation with multiple orthogonal methods; Strong evidence\",\n      \"pmids\": [\"20057356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Bves interacts with NDRG4; this interaction is required for fibronectin recycling through the autocrine ECM deposition pathway and for fusion of recycling endosomes with the basal cell surface, regulating directional cell movement of epicardial cells.\",\n      \"method\": \"Co-immunoprecipitation, total internal reflectance fluorescence (TIRF) microscopy, fibronectin recycling assays, cell motility/directionality assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction plus mechanistic trafficking and motility assays with functional validation; multiple orthogonal methods\",\n      \"pmids\": [\"24048452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"POPDC1 (Popdc1/Bves) co-localizes and co-immunoprecipitates with caveolin-3 at the sarcolemma, intercalated discs, and T-tubules; Popdc1-null mice have a 70% reduction in caveolae number and impaired Ca2+ transients, increased oxidative stress vulnerability, no pharmacological preconditioning, and reduced ischemic preconditioning capacity, establishing POPDC1 as a caveolae-associated protein important for caveolae structural integrity and myocardial ischemia tolerance.\",\n      \"method\": \"Immunoconfocal microscopy, co-immunoprecipitation, equilibrium density gradient co-sedimentation, electron microscopy, Langendorff heart perfusion, cardiomyocyte Ca2+ transient measurement\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus density gradient co-sedimentation plus multiple functional readouts in KO mice; Moderate-to-Strong evidence\",\n      \"pmids\": [\"24066022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The POPDC1 S201F missense mutation (found in patients with cardiac arrhythmia and limb-girdle muscular dystrophy) reduces cAMP affinity by 50% compared to WT protein; this mutation impairs membrane trafficking of POPDC1 and POPDC2 in patient skeletal muscle; forced expression of POPDC1(S201F) in HL-1 cardiac cells increases hyperpolarization and upstroke velocity of the action potential; expression of the homologous zebrafish mutation causes heart and skeletal muscle phenotypes mirroring the human disease.\",\n      \"method\": \"Whole-exome sequencing, cAMP binding assay, immunostaining/membrane fractionation, action potential recording (HL-1 cells), zebrafish morpholino/transgenic expression\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct biochemical cAMP binding assay + cellular electrophysiology + in vivo zebrafish model; multiple orthogonal methods; foundational disease-mechanism paper\",\n      \"pmids\": [\"26642364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BVES interacts with PR61α (a regulatory subunit of protein phosphatase 2A) identified by yeast two-hybrid screen; this BVES–PR61α interaction mediates c-Myc destruction; BVES-null mice show increased Wnt signaling and elevated c-Myc levels; loss of BVES promotes colitis-associated tumorigenesis.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, Bves knockout mouse AOM/DSS tumor model, western blotting for c-Myc levels\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid + KO mouse model; interaction confirmed by Co-IP but single lab\",\n      \"pmids\": [\"28389570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Mouse Pop1/Bves is required for adult skeletal muscle regeneration: Pop1-null mice show persistent LacZ expression and retarded regeneration after cardiotoxin injury; activated satellite cells rapidly upregulate Pop1-LacZ expression, and beta-adrenergic stimulation with isoproterenol rapidly increases Pop1-LacZ activity without transcriptional induction, suggesting protein stabilization.\",\n      \"method\": \"Pop1-LacZ null mouse generation, cardiotoxin-induced muscle injury, LacZ histochemical staining, isoproterenol administration\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific regeneration phenotype; single lab but clear functional readout\",\n      \"pmids\": [\"11839816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BVES (POPDC1) regulates tight junction formation and epithelial integrity; loss of BVES through promoter DNA hypermethylation promotes EMT in colorectal cancer cells; re-expression of BVES in CRC cell lines decreases proliferation, migration, invasion, and anchorage-independent growth; dominant-negative BVES in corneal epithelial cells induces mesenchymal features. These outcomes are associated with changes in adherens junction and tight junction composition and signaling.\",\n      \"method\": \"Promoter methylation analysis, siRNA knockdown, BVES re-expression, EMT marker analysis (western blot), transwell migration/invasion assay, orthotopic xenograft, dominant-negative expression\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays in vitro and in vivo; Moderate-Strong evidence across cell lines and in vivo model\",\n      \"pmids\": [\"21911938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Bves modulates RhoA activation and ZONAB/DbpA activity through its regulatory effect on tight junction formation; truncated Bves (t-Bves) disrupts endogenous Bves membrane localization and ZO-1 interaction, leads to increased RhoA activity (measured by FRET) and increased ZONAB/DbpA transcriptional activity, and decreases transepithelial electrical resistance.\",\n      \"method\": \"Stable transfection of WT and truncated Bves, FRET assay for RhoA activity, luciferase reporter for ZONAB/DbpA activity, transepithelial electrical resistance, immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — FRET-based activity assay plus reporter assay plus TER; single lab, multiple functional readouts\",\n      \"pmids\": [\"21283798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Bves (zBves) in zebrafish regulates epidermal tight junction integrity and barrier function through the PAR junctional complex, particularly atypical PKC (aPKC); loss of zBves disrupts aPKC localization at cell junctions and causes osmotic stress sensitivity; partial rescue achieved by co-injection of tjp-2/ZO-2 or PAR complex (par-3, par-6, aPKC) mRNAs, but aPKC assembly is not upstream of zBves.\",\n      \"method\": \"Morpholino knockdown in zebrafish, osmotic stress assay, mRNA rescue experiments, immunofluorescence for aPKC/claudin\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via rescue experiment plus immunofluorescence in zebrafish; single lab, moderate strength\",\n      \"pmids\": [\"23019331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"POPDC1 scaffolds a macromolecular complex of adenylyl cyclase 9 (AC9) and the TREK-1 potassium channel in the heart; POPDC1 interacts with AC9 in a cAMP-independent manner, while TREK-1 association with the AC9:POPDC1 complex is reduced upon β-adrenergic receptor stimulation; AC9 activity is required for β-adrenergic receptor-mediated reduction of TREK-1 complex formation and for reversing POPDC1 enhancement of TREK-1 currents; deletion of Adcy9 causes bradycardia and stress-induced heart rate variability.\",\n      \"method\": \"Co-purification assays, co-immunoprecipitation, enzymatic AC9 activity assay, electrophysiology (TREK-1 current recording), Adcy9 knockout mouse cardiac phenotyping\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct biochemical interaction (Co-IP + co-purification), activity assay, electrophysiology, and in vivo KO phenotype; multiple orthogonal methods; Moderate-Strong\",\n      \"pmids\": [\"36254885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BVES (POPDC1) negatively regulates adenylyl cyclase 9 (ADCY9)-mediated cAMP signaling in skeletal muscle; BVES physically interacts with and inhibits ADCY9 activity; BVES deletion increases cAMP, elevates PKA signaling, promotes FoxO-mediated ubiquitin-proteasome degradation and autophagy, causing muscle atrophy; viral BVES delivery reverses these defects in BVES-KO mice.\",\n      \"method\": \"Co-immunoprecipitation, ADCY9 enzymatic activity assay, BVES-KO mouse model, PKA pathway analysis (western blot), AAV-mediated BVES rescue, muscle function and histology\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct biochemical interaction + enzymatic activity assay + KO phenotype + viral rescue; multiple orthogonal methods and in vivo validation\",\n      \"pmids\": [\"36997581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BVES interacts with ANO5 (Anoctamin 5) in muscle cells; the N-terminus of ANO5 mediates interaction with the C-terminus of BVES; both proteins co-localize at the endoplasmic reticulum membrane in muscle cells; genome editing-mediated disruption of either ANO5 or BVES significantly suppresses C2C12 myoblast differentiation.\",\n      \"method\": \"BioID2 proximity labeling + mass spectrometry, co-immunoprecipitation, co-localization immunofluorescence, CRISPR/Cas9 KO, myoblast differentiation assay\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proximity labeling + confirmed Co-IP + KO phenotype; single lab, moderate strength\",\n      \"pmids\": [\"34963485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"POPDC1 interacts with XIRP1 (Xin actin-binding repeat-containing protein 1) and actin; both POPDC1/2 and XIRP1 co-localize at intercalated discs and T-tubules in adult human and rat heart; the POPDC1–XIRP1 interaction was confirmed in adult rat heart extracts.\",\n      \"method\": \"Protein pulldown from human skeletal myotubes with proteomic analysis (mass spectrometry), co-immunoprecipitation from rat heart extracts, immunofluorescence with new monoclonal antibodies\",\n      \"journal\": \"BMC molecular and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS interactome confirmed by Co-IP and localization; single lab but two orthogonal interaction methods\",\n      \"pmids\": [\"33261556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BVES regulates intestinal stem cell programs; Bves-null mice show expanded intestinal stem cell compartment (increased Lgr5), increased crypt height and proliferation; Bves-null enteroids show increased stemness parameters, amplified Wnt signaling, and greater responsiveness to Wnt activation; after radiation, Bves-null mice have greater crypt viability due to amplified Wnt signaling.\",\n      \"method\": \"Bves knockout mice, Lgr5-EGFP reporter intercross, ex vivo 3D enteroid culture, stem cell marker analysis, Wnt pathway reporter assays, radiation injury model\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific stem cell and Wnt pathway readouts; multiple methods in single study\",\n      \"pmids\": [\"26891025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In zebrafish, popdc1 mutation (S191F, homologous to human POPDC1 S201F) and popdc1 knockout cause atrioventricular node dysfunction: reduced heart rate, prolonged AV delay, slower action potential and calcium transient upstroke, and altered calcium transient duration; β-adrenergic stimulation exacerbates AV block in adult popdc1 mutant hearts, establishing that POPDC1 dysfunction impairs cardiac electrophysiology and calcium handling particularly under sympathetic stress.\",\n      \"method\": \"Fluorescent functional analysis of larval and adult zebrafish hearts (voltage and Ca2+ indicators), isoproterenol (β-adrenergic) stimulation, homozygous mutant and knockout comparison\",\n      \"journal\": \"Genes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO/mutation with direct electrophysiology and Ca2+ imaging readouts in zebrafish; single study but mechanistically defined\",\n      \"pmids\": [\"38540339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Bves maintains vascular smooth muscle cell (VSMC) contractile phenotype through Dusp1-dependent inhibition of p38MAPK and ERK1/2; Bves knockdown reduces Dusp1 expression and enhances p38MAPK/ERK1/2 activation, promoting VSMC phenotypic switching; VSMC-specific Bves and Dusp1 overexpression in aortic allografts attenuates neointimal lesion formation in vivo.\",\n      \"method\": \"RNA sequencing (correlation), siRNA knockdown and overexpression of Bves in VSMCs, western blotting for Dusp1/p38MAPK/ERK1/2, rat aortic graft model with VSMC-specific overexpression\",\n      \"journal\": \"Atherosclerosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with pathway readouts (Dusp1/MAPK) and in vivo rescue; single lab, moderate strength\",\n      \"pmids\": [\"36037759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"POPDC1 loss in Popdc1 knockout hippocampal slices results in PKA-dependent enhancement of CA1 long-term potentiation (LTP) in response to weaker stimulation paradigms, and enhanced forskolin-induced potentiation, revealing POPDC1 as a negative regulator of hippocampal synaptic plasticity through modulation of cAMP-PKA-PDE signaling.\",\n      \"method\": \"Popdc1 knockout mice, acute hippocampal slice electrophysiology (LTP induction), PKA inhibitor experiments, forskolin-induced potentiation\",\n      \"journal\": \"Cerebral cortex (New York, N.Y. : 1991)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with direct electrophysiology readout and pharmacological confirmation; single lab, single study\",\n      \"pmids\": [\"34937090\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"POPDC1 (BVES) is a cAMP-binding transmembrane protein (extracellular N-terminus, three transmembrane domains, cytoplasmic C-terminus) that localizes to the plasma membrane, tight junctions, caveolae, T-tubules, and intercalated discs of muscle and epithelial cells, where it: (1) scaffolds a macromolecular complex of adenylyl cyclase 9 and the TREK-1 potassium channel to regulate cardiac pacemaking/conduction; (2) acts as a negative feedback regulator of ADCY9-mediated cAMP–PKA signaling in skeletal muscle to maintain muscle homeostasis; (3) promotes cell adhesion and epithelial integrity through interactions with ZO-1 at tight junctions and by self-dimerization via its cytoplasmic lysines 272/273; (4) regulates vesicular transport and receptor recycling through interaction with VAMP3; (5) modulates Rac1/Cdc42 activity via interaction with the GEF GEFT; (6) associates with caveolin-3 to maintain caveolae structure and cardiac ischemia tolerance; and (7) interacts with PR61α/PP2A to promote c-Myc destruction, suppressing Wnt-driven tumorigenesis; pathogenic mutations (e.g., S201F) reduce cAMP binding affinity and impair membrane trafficking, causing limb-girdle muscular dystrophy and cardiac arrhythmia.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\nPapers about POPDC1/BVES (canonical protein, KEEP):\n- [10] bves discovery in coronary development → KEEP\n- [11] Bves cell adhesion molecule → KEEP\n- [16] POPDC1(S201F) muscular dystrophy/arrhythmia → KEEP\n- [17] Bves/tight junction interaction → KEEP\n- [19] Mouse Pop1 muscle regeneration → KEEP\n- [20] BVES regulates EMT → KEEP\n- [22] Bves/GEFT/Rac1/Cdc42 → KEEP\n- [24] Membrane topology of Bves/Pop1A → KEEP\n- [27] BVES/PP2A/c-Myc → KEEP\n- [28] Bves/VAMP3 vesicular transport → KEEP\n- [30] Netrin-1/BVES/HCC → KEEP (mechanistic)\n- [31] Popdc1 caveolae-associated → KEEP\n- [32] Bves/NDRG4 directional migration → KEEP\n- [34] Developmental expression Pop1/Bves → KEEP\n- [35] Bves tight junction signaling → KEEP\n- [36] Bves in retina/cornea → KEEP\n- [37] Bves/RhoA in trabecular meshwork → KEEP\n- [39] Bves intracellular interaction domain → KEEP\n- [41] hbves cloning → KEEP\n- [43] Bves expression mouse development → KEEP\n- [44] Bves Popeye family review → KEEP\n- [45] BVES LOF mutations LGMD → KEEP\n- [46] Drosophila bves/Grk/EGFR → KEEP\n- [47] BVES intestinal stem cells → KEEP\n- [48] Bves avian embryogenesis → KEEP\n- [49] Bves/aPKC tight junction zebrafish → KEEP\n- [51] Monoclonal antibodies Pop1/BVES → KEEP\n- [52] BVES colitis/epithelial integrity → KEEP\n- [54] Novel BVES variants LGMDR25 → KEEP\n- [57] BVES/POPDC1 review → KEEP\n- [58] POPDC1 EGFR breast cancer → KEEP\n- [59] POPDC1 breast cancer → KEEP\n- [60] POPDC1/AC9/TREK-1 scaffold → KEEP\n- [61] LGMDR25 Japanese patients → KEEP\n- [62] BVES mutations tetralogy of Fallot → KEEP\n- [63] Popdc1/Bves cardiomyocyte viability/Rac1 → KEEP\n- [67] Novel POPDC1 variant LGMDR25 → KEEP\n- [69] POPDC1/2 interaction with XIRP1 → KEEP\n- [70] BVES/ZO-1/GEFT/RhoA HCC → KEEP\n- [71] BVES/ANO5 interaction myoblast differentiation → KEEP\n- [72] POPDC1 hippocampal synaptic plasticity → KEEP\n- [74] Bves/Dusp1/p38MAPK/ERK1/2 VSMC → KEEP\n- [75] POPDC1 malignant phenotype review → KEEP\n- [76] AAV9.BVES gene therapy → KEEP\n- [79] BVES negative regulator ADCY9/cAMP → KEEP\n- [83] BVES/VOT stenosis zebrafish → KEEP\n- [84] BVES R129W tetralogy of Fallot → KEEP\n- [85] POPDC1 colon cancer CaM antagonist → KEEP\n- [86] miR-665/BVES in RIF → KEEP (expression)\n- [88] POPDC1 variants zebrafish cardiac electrophysiology → KEEP\n- [38] Bves ten years review → KEEP\n- [66] BVES junctional signaling review → KEEP\n- [25] BVES/POPDC3 gastric cancer → KEEP (expression only)\n- Gene2pubmed [13] POPDC cAMP/TREK-1 pacemaking → KEEP\n- Gene2pubmed [14] Popeye gene family isolation → KEEP\n- Gene2pubmed [15] POPDC cAMP effector review → KEEP\n- Gene2pubmed [18] POPDC1 failing hearts → KEEP\n- Gene2pubmed [23] POPDC mutations heteromeric interaction → KEEP\n\n**EXCLUDE (alias collisions/alt-locus):**\n- [1],[2],[6],[9],[12],[13],[14],[15],[23] C. elegans POP-1 (TCF/LEF) → EXCLUDE\n- [3] Yeast POP1 (RNase MRP/P protein) → EXCLUDE\n- [4],[7],[56],[73],[89] Human POP1 = PYRIN-domain only protein (inflammasome) → EXCLUDE\n- [5],[8] Fission yeast Pop1 (WD-repeat/SCF) → EXCLUDE\n- [18] POP1 m6A/TNBC (RNase subunit) → EXCLUDE\n- [21],[50],[53],[55],[80],[90] POP1 = RNase MRP component → EXCLUDE\n- [26] lnc-POP1-1 (lncRNA, alt-locus product) → EXCLUDE (case B)\n- [29] POP1 = PYRIN-only protein → EXCLUDE\n- [40] BVES-AS1 encoded peptide (alt-locus product) → EXCLUDE (case B)\n- [64] POP1 PYRIN-only computational → EXCLUDE\n- [65] C. elegans POP-1 → EXCLUDE\n- [77] BVES-AS1 lncRNA → EXCLUDE (case B)\n- [78] POP1 = RNase subunit breast cancer → EXCLUDE\n- [81] MBNL1-AS1/miR-29c-3p/BVES → EXCLUDE (lncRNA, no POPDC1 mechanism)\n- [82] BVES-AS1 lncRNA → EXCLUDE (case B)\n- [87] C. elegans POP-1 commentary → EXCLUDE\n- [93] BVES-AS lncRNA expression → EXCLUDE (case B)\n- [94] Preprint: pop1/pop2/pop3/pop4 = CD8 T cell populations, not POPDC1 → EXCLUDE\n- Gene2pubmed [1],[2],[3],[4],[5],[6],[7],[8],[9],[10],[11],[12],[16],[17],[19],[20],[21],[22],[24],[25] → most are MGC/GWAS/interactome resources; check for mechanistic content about POPDC1 specifically\n- Gene2pubmed [6] height GWAS → EXCLUDE\n- Gene2pubmed [11] menarche GWAS → EXCLUDE\n- Gene2pubmed [12] lung cancer methylation → EXCLUDE (expression only)\n- Gene2pubmed [16] pediatric height → EXCLUDE\n- Gene2pubmed [9] HNRNPL prostate cancer → EXCLUDE\n- Gene2pubmed [17] Hsp27 interactome → EXCLUDE\n- Gene2pubmed [19] α-synuclein iPSC → EXCLUDE\n- Gene2pubmed [20] tyrosine phosphatase interactome → EXCLUDE\n- Gene2pubmed [21] MKRN2/GLE1 → EXCLUDE\n- Gene2pubmed [22] SLC interactome → EXCLUDE\n- Gene2pubmed [24] EndoMAP → EXCLUDE\n- Gene2pubmed [95 preprint] POPDC2 → about POPDC2 primarily, but mentions POPDC1 complex → review for POPDC1-specific findings\n\nNow extracting discoveries from KEPT papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"BVES (blood vessel/epicardial substance, POPDC1) was identified as a novel, highly conserved transmembrane protein expressed at high levels in the developing heart, proepicardial organ, migrating epicardium, epicardial-derived mesenchyme, and smooth muscle of developing coronary arteries, suggesting a role as an early marker of vascular smooth muscle differentiation.\",\n      \"method\": \"Subtractive hybridization cloning, Northern blot, anti-Bves antibody immunostaining in chick and mouse embryos\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — original discovery paper, single lab, immunolocalization with developmental context but limited functional mechanism\",\n      \"pmids\": [\"10208750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human BVES (hbves) maps to chromosome 6q21 and is predicted to encode a protein with three transmembrane helices, establishing POPDC1 as a multi-pass transmembrane protein conserved across chick, mouse, and human.\",\n      \"method\": \"cDNA cloning, BLAST database analysis, Northern/dot blot, computer topology prediction\",\n      \"journal\": \"Mammalian genome\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — sequence analysis with expression confirmation, no direct functional assay\",\n      \"pmids\": [\"10441744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Three Popeye (POPDC1, POPDC2, POPDC3) genes were identified as a novel vertebrate gene family encoding proteins with three conserved transmembrane domains, preferentially expressed in developing and adult striated muscle, with individual members showing distinct cardiac chamber and temporal expression patterns.\",\n      \"method\": \"cDNA library screening, chromosomal mapping, in situ hybridization, Northern blot\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — gene family characterization, multiple expression methods but limited mechanistic follow-up\",\n      \"pmids\": [\"10882522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Bves/POPDC1 is a membrane protein with three transmembrane helices confined to the lateral membrane compartment of epithelial epicardial cells; it accumulates in a perinuclear region when cells are dissociated and traffics to the cell membrane and points of cell-cell contact upon cellular contact. Transfection of Bves into non-adherent L-cells confers adhesive behavior, identifying it as a novel cell adhesion molecule. Anti-Bves antibodies inhibit epithelial migration from the proepicardium.\",\n      \"method\": \"Immunofluorescence, transfection into L-cells (adhesion assay), antibody inhibition of proepicardial cell migration in vitro\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays (adhesion gain-of-function, antibody inhibition, localization) in single study\",\n      \"pmids\": [\"11493530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Genetic deletion of mouse Pop1/POPDC1 (null mice) impairs skeletal muscle regeneration after cardiotoxin injury, with persistence of Pop1-LacZ expression and retarded regeneration in homozygotes. Beta-adrenergic agonist (isoproterenol) treatment causes post-translational stabilization of the POPDC1 protein without transcriptional induction.\",\n      \"method\": \"LacZ knock-in null mouse, cardiotoxin muscle injury model, isoproterenol administration, LacZ staining, histology\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined regeneration phenotype; post-translational regulation demonstrated by dissociation of protein and mRNA levels\",\n      \"pmids\": [\"11839816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The membrane topology of Bves/POPDC1 was established biochemically: the amino terminus is extracellular (glycosylated via N-linked sites), there are three transmembrane domains, and the carboxyl terminus is cytoplasmic. Bves-Bves homotypic interactions occur in the cytoplasmic compartment, mediated by the C-terminal tail.\",\n      \"method\": \"Glycosylation assays, exogenous glycosylation site insertion, co-expression of C-terminal constructs in different subcellular compartments, immunoreactivity enhancement with detergent\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — three independent biochemical topology methods converging on same conclusion\",\n      \"pmids\": [\"12815060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Bves/POPDC1 localizes with tight junction markers ZO-1 and occludin in polarized epithelial cells and in vivo. GST pull-down experiments demonstrate a direct physical interaction between ZO-1 and the intracellular C-terminal tail of Bves. Bves knockdown causes loss of transepithelial resistance and disruption of junction protein membrane localization, demonstrating that Bves modulates tight junction integrity.\",\n      \"method\": \"Immunolocalization with TJ markers, Ca2+ chelation/TPA treatment, GST pull-down with C-terminal Bves tail and ZO-1, siRNA knockdown with transepithelial electrical resistance measurement\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct pull-down identifying ZO-1 as binding partner, confirmed by functional knockdown with TJ integrity readout\",\n      \"pmids\": [\"16188940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In Drosophila, bves (DmBves/POPDC1 homolog) expression in anterior-dorsal follicle cells is repressed by the Grk/EGFR signaling pathway during oogenesis. Loss of bves function via antisense RNA causes embryonic lethality with pole cell migration defects and abnormal germband extension, establishing bves as essential for embryonic development downstream of EGFR signaling.\",\n      \"method\": \"In situ hybridization, genetic epistasis with Grk/EGFR pathway mutants, antisense RNA expression, pole cell migration analysis\",\n      \"journal\": \"International journal of developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis in Drosophila model with defined developmental phenotype; ortholog context\",\n      \"pmids\": [\"17183463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Bves/POPDC1 homodimerizes through an intracellular domain mapped to amino acids 268-274, with lysines 272 and 273 being essential for homodimerization and cell adhesion. Mutations at these positions abolish junctional complex formation (loss of ZO-1 and E-cadherin at membrane), reduce transepithelial electrical resistance, and promote epithelial-to-mesenchymal transition.\",\n      \"method\": \"GST pull-down, SPOTs peptide array, site-directed mutagenesis, transfection into corneal epithelial cells, TER measurement, immunofluorescence\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — domain mapping by mutagenesis + functional validation (TER, EMT) in single study with multiple methods\",\n      \"pmids\": [\"18493308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Bves/POPDC1 directly interacts with GEFT, a GEF for Rho-family GTPases. Exogenous Bves expression reduces Rac1 and Cdc42 activity (but not RhoA), and produces corresponding changes in cell locomotion speed and cell roundness. Bves and GEFT co-localize in adult skeletal muscle.\",\n      \"method\": \"Co-immunoprecipitation/pulldown, co-localization in adult skeletal muscle, Rac1/Cdc42/RhoA activity assays (G-LISA/pulldown), cell motility and morphology assays upon Bves overexpression\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction confirmed, functional consequence on GTPase activity and cellular behavior demonstrated\",\n      \"pmids\": [\"18541910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Increased Bves/POPDC1 expression in trabecular meshwork cells leads to increased tight junction formation (elevated occludin, cingulin, ZO-1), decreased RhoA activation (measured by FRET), and decreased myosin light chain phosphorylation, establishing a regulatory pathway upstream of RhoA in these cells.\",\n      \"method\": \"Stable transfection, TER measurement, FRET-based RhoA activity probe, Western blot for MLC phosphorylation\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean overexpression with mechanistic downstream readouts, single lab\",\n      \"pmids\": [\"19628742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Bves/POPDC1 directly interacts with VAMP3, a SNARE protein mediating vesicular transport, and facilitates recycling of transferrin receptor and β1-integrin. Cells expressing a mutated Bves are severely impaired in recycling of these molecules. Morpholino knockdown of Bves in Xenopus inhibits transferrin receptor recycling and causes gastrulation defects related to impaired integrin-dependent cell movements.\",\n      \"method\": \"Two independent co-immunoprecipitation/interaction assays, transferrin and integrin recycling assays, Morpholino knockdown in Xenopus laevis, kymographic analysis of cell spreading\",\n      \"journal\": \"EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct interaction identification with VAMP3, functional validation in vitro and in vivo (Xenopus), multiple orthogonal methods\",\n      \"pmids\": [\"20057356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BVES/POPDC1 regulates tight junction formation and suppresses EMT in human corneal and colon cancer cells. BVES reexpression in colorectal carcinoma cells promotes epithelial phenotype, decreases proliferation/migration/invasion, and blocks metastasis in orthotopic xenografts. Expression of a dominant-negative BVES mutant induces mesenchymal features in corneal epithelial cells.\",\n      \"method\": \"Re-expression in CRC cell lines, dominant-negative mutant expression, orthotopic xenograft mouse model, cell migration/invasion/proliferation assays, AJ/TJ composition analysis\",\n      \"journal\": \"Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain- and loss-of-function in vitro plus in vivo xenograft model with defined phenotypic readouts\",\n      \"pmids\": [\"21911938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Bves/POPDC1 modulates RhoA activation and ZONAB/DbpA transcriptional activity through its regulatory effect on tight junction formation; C-terminus truncated Bves disrupts ZO-1 interaction, causes loss of TJ protein localization, increases RhoA activity (30% increase by FRET), and increases ZONAB/DbpA transcriptional activity.\",\n      \"method\": \"Stable transfection of full-length vs. C-terminus truncated Bves, TER measurement, FRET-based RhoA activity, luciferase reporter for ZONAB/DbpA transcriptional activity, immunofluorescence\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain-function analysis with multiple mechanistic readouts, single lab\",\n      \"pmids\": [\"21283798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Popeye domain-containing proteins (POPDC1 and POPDC2) are essential regulators of cardiac pacemaking under stress. The conserved Popeye domain functions as a high-affinity cAMP-binding site. POPDC proteins interact with the potassium channel TREK-1, increasing its cell surface expression and current density; both effects are negatively modulated by cAMP. POPDC1 or POPDC2 knockout mice develop stress-induced sinus node dysfunction and age-dependent bradyarrhythmia.\",\n      \"method\": \"Popdc1/Popdc2 knockout mice, ECG telemetry under stress, cAMP-binding assays (competitive binding with radiolabeled cAMP), co-immunoprecipitation with TREK-1, electrophysiology (current density measurements), cell surface expression assays\",\n      \"journal\": \"Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted cAMP binding, co-IP with TREK-1, functional electrophysiology, in vivo KO phenotype; replicated across POPDC1 and POPDC2\",\n      \"pmids\": [\"22354168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Bves/POPDC1 knockdown in zebrafish disrupts atypical PKC (aPKC) localization at cell junctions and affects the PAR junctional complex (par-3, par-6, prkci/aPKC), leading to loss of epidermal barrier function and osmotic sensitivity. Rescue experiments with ZO-2, par-3, par-6, and aPKC mRNAs partially restore survival, establishing that Bves acts upstream of the PAR complex at the tight junction.\",\n      \"method\": \"Morpholino knockdown in zebrafish, osmotic stress assay, mRNA rescue experiments, immunofluorescence for aPKC and claudins\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo epistasis via mRNA rescue in zebrafish identifies PAR complex as downstream effectors\",\n      \"pmids\": [\"23019331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"POPDC1/Bves is a caveolae-associated protein that co-localizes and co-immunoprecipitates with caveolin-3 at the sarcolemma, intercalated discs, and T-tubules. POPDC1-null hearts show a 70% reduction in caveolae number, impaired Ca2+ transients, increased vulnerability to oxidative stress, no pharmacological preconditioning, and greater ischemia/reperfusion injury with larger infarct size, indicating POPDC1 is required for caveolae structural and functional integrity.\",\n      \"method\": \"Co-immunoprecipitation and co-sedimentation in density gradients (caveolae isolation), electron microscopy (caveolae quantification), confocal co-localization, Ca2+ transient measurements, Langendorff heart perfusion with I/R injury\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical interaction with caveolin-3 confirmed by multiple methods, KO mice with multiple functional readouts\",\n      \"pmids\": [\"24066022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A novel protein-protein interaction between Bves/POPDC1 and NDRG4 is required for autocrine ECM deposition and epicardial cell directional movement. The Bves/NDRG4 interaction is required for fibronectin recycling through the autocrine ECM pathway, and TIRFM shows the interaction is needed for fusion of recycling endosomes with the basal cell surface.\",\n      \"method\": \"Co-immunoprecipitation, siRNA disruption, fibronectin recycling assay, total internal reflectance fluorescence microscopy (TIRFM), directional migration assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — novel interaction identified and functionally validated with multiple readouts including live imaging and migration quantification\",\n      \"pmids\": [\"24048452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A homozygous missense mutation POPDC1(S201F) causes cardiac arrhythmia and limb-girdle muscular dystrophy. The S201F variant displays a 50% reduction in cAMP-binding affinity. In patient skeletal muscle, both POPDC1(S201F) and WT POPDC2 show impaired membrane trafficking. Expression of POPDC1(S201F) in HL-1 cardiac cells increases hyperpolarization and action potential upstroke velocity. The homologous zebrafish mutation (popdc1S191F) recapitulates heart and skeletal muscle phenotypes.\",\n      \"method\": \"Whole-exome sequencing, cAMP-binding affinity assay, immunofluorescence of patient muscle biopsies, electrophysiology in HL-1 cells, zebrafish knock-in model\",\n      \"journal\": \"Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct cAMP-binding assay with mutagenesis, electrophysiology, patient tissue analysis, and zebrafish model all converging\",\n      \"pmids\": [\"26642364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BVES/POPDC1 interacts with PR61α (a PP2A regulatory subunit) to mediate c-Myc destruction. Loss of Bves in mouse colitis-associated cancer model leads to increased c-Myc levels, Wnt activation, and increased tumor multiplicity. The BVES-PP2A interaction was identified by yeast two-hybrid screen.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, AOM/DSS mouse colitis-cancer model, immunohistochemistry, Western blot for c-Myc\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — yeast two-hybrid plus co-IP for interaction, in vivo KO model with c-Myc readout; mechanism not fully reconstituted\",\n      \"pmids\": [\"28389570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Popdc1/BVES siRNA-mediated knockdown in cardiomyocytes under serum deprivation causes cell injury and death, upregulation of pro-apoptotic Bnip3, and reduction of Rac1-GTPase activity and Akt phosphorylation. Combined POPDC1/Bnip3 silencing attenuates this injury. Chromatin immunoprecipitation showed increased FoxO3 binding to the Bnip3 promoter and decreased NFκB nuclear presence in POPDC1-deficient cardiomyocytes.\",\n      \"method\": \"siRNA knockdown, cell viability assays, Western blot (Bnip3, Rac1-GTP, pAkt), chromatin immunoprecipitation (FoxO3 and NFκB at Bnip3 promoter), combined double-knockdown\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined molecular pathway (POPDC1→Rac1/Akt→FoxO3/NFκB→Bnip3) with ChIP and double-knockdown validation, single lab\",\n      \"pmids\": [\"27886395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BVES/POPDC1 regulates intestinal stem cell programs; Bves-/- mice show expanded crypt height, elevated Lgr5 stem cell marker, and increased proliferation. Bves-/- enteroids show increased stemness, amplified Wnt signaling, and responsiveness to Wnt activation. After radiation, Bves-/- mice show greater crypt viability and amplified Wnt signaling, identifying BVES as a negative regulator of Wnt-dependent intestinal stem cell programs.\",\n      \"method\": \"Bves KO mice, Lgr5-EGFP reporter intercross, 3D enteroid culture, proliferation and stem cell marker analysis, Wnt pathway activation assays, radiation injury model\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo readouts in KO model with stem cell and Wnt pathway mechanistic linkage\",\n      \"pmids\": [\"26891025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"POPDC1 is negatively regulated by EGFR signaling in breast cancer cells; EGFR activation reduces POPDC1 expression, and POPDC1 overexpression attenuates EGF-mediated cell migration and proliferation in MCF7, MDA231 and SKBR3 cells. Functional suppression of POPDC1 promotes breast cancer cell migration and proliferation, while cAMP upregulates POPDC1 expression.\",\n      \"method\": \"EGFR inhibitor/activator treatment with Western blot for POPDC1, POPDC1 overexpression and siRNA knockdown, EGF-stimulated migration and proliferation assays, cAMP treatment\",\n      \"journal\": \"Cancer letters / Bioscience reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional cell-line studies with defined pathway, but mechanistic linkage between EGFR and POPDC1 is partially characterized\",\n      \"pmids\": [\"28807821\", \"28954821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"POPDC1 and POPDC2 interact with XIRP1 (Xin actin-binding repeat-containing protein 1) in human skeletal myotubes, confirmed by proteomic pull-down and co-immunoprecipitation from adult rat heart. Both XIRP1 and POPDC1/2 localize together at intercalated discs and T-tubules in human and rat heart.\",\n      \"method\": \"Bead-based pull-down with proteomic analysis (mass spectrometry), co-immunoprecipitation from rat heart, immunofluorescence with new monoclonal antibodies in human skeletal muscle and cardiac tissue\",\n      \"journal\": \"BMC molecular and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — MS-identified interaction confirmed by co-IP, localization consistent; functional consequence not established in same study\",\n      \"pmids\": [\"33261556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ANO5 and BVES/POPDC1 directly interact; the N-terminus of ANO5 mediates interaction with the C-terminus of BVES. Both proteins co-localize at the ER membrane in muscle cells. Genome editing-mediated deletion of either ANO5 or BVES significantly suppresses C2C12 myoblast differentiation with little effect on proliferation, placing BVES in the same functional pathway as ANO5 in myogenesis.\",\n      \"method\": \"BioID2 proximity labeling with mass spectrometry, co-immunoprecipitation, domain-mapping co-IP with truncation mutants, CRISPR/Cas9 knockout, myoblast differentiation assays\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proximity labeling + co-IP domain mapping + KO functional phenotype, convergent methods\",\n      \"pmids\": [\"34963485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"POPDC1 scaffolds a macromolecular complex containing adenylyl cyclase 9 (AC9) and the potassium channel TREK-1 in the heart. TREK-1 binds the AC9:POPDC1 complex and co-purifies in a POPDC1-dependent manner with AC9 activity. The AC9:POPDC1 interaction is cAMP-independent, but TREK-1 association with the complex is reduced upon β-adrenergic receptor stimulation in an AC9 activity-dependent manner. Deletion of AC9 causes bradycardia and stress-induced heart rate variability.\",\n      \"method\": \"Co-immunoprecipitation, co-purification with AC9 activity measurements, TREK-1 current recordings in transfected cells, AC9 knockout mice (ECG telemetry), β-adrenergic stimulation experiments\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical complex identification with functional electrophysiology and in vivo KO phenotype; AC9 activity requirement demonstrated by pharmacology\",\n      \"pmids\": [\"36254885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In POPDC1-KO hippocampal slices, CA1 long-term potentiation (LTP) is enhanced in a PKA-dependent manner in response to weaker stimulation paradigms. POPDC1 is widely expressed in brain regions including hippocampus. Loss of POPDC1 enhances forskolin-induced potentiation without affecting basal transmission. These findings identify POPDC1 as a novel negative regulator of hippocampal synaptic plasticity through cAMP-PKA signaling.\",\n      \"method\": \"Popdc1 KO mice, acute hippocampal slice electrophysiology (field recordings), pharmacological PKA inhibition, forskolin-induced potentiation assays\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined electrophysiological phenotype and pharmacological pathway validation, single lab\",\n      \"pmids\": [\"34937090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"POPDC1 mutations causing LGMDR25 show differential effects on heteromeric POPDC1-POPDC2 complex formation and membrane trafficking. POPDC proteins interact through a helix-helix interface at the C-terminus of the Popeye domain. Ultra-conserved hydrophobic residues at this interface are required for membrane trafficking of the POPDC1-POPDC2 complex; mutations impairing complex formation cause greater trafficking defects than mutations that preserve interaction.\",\n      \"method\": \"Co-precipitation, proximity ligation assay, bioluminescence resonance energy transfer (BRET), bimolecular fluorescence complementation (BiFC), site-directed mutagenesis of conserved hydrophobic residues, immunostaining of patient biopsies\",\n      \"journal\": \"Acta neuropathologica communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — domain mapped by mutagenesis, interaction confirmed by four independent methods (co-IP, PLA, BRET, BiFC), functionally linked to membrane trafficking\",\n      \"pmids\": [\"36624536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BVES/POPDC1 functions as a negative feedback regulator of adenylyl cyclase 9 (ADCY9)-mediated cAMP signaling in skeletal muscle. BVES interacts with and negatively regulates ADCY9 activity. BVES deletion increases PKA signaling, promoting FoxO-mediated ubiquitin-proteasome degradation and autophagy initiation, leading to reduced muscle mass and impaired performance. Viral re-expression of BVES in Bves-deficient muscle reverses these defects.\",\n      \"method\": \"BVES KO mice, AAV-mediated BVES re-expression, co-immunoprecipitation with ADCY9, cAMP/PKA activity assays, proteolysis and autophagy pathway Western blots, muscle mass/strength/exercise performance measures\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — interaction with ADCY9 demonstrated, functional rescue by viral re-expression, defined downstream pathway (PKA→FoxO→proteasome/autophagy); multiple orthogonal methods\",\n      \"pmids\": [\"36997581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BVES/POPDC1 co-localizes with ZO-1 and GEFT in HCC cells, regulates ZO-1 expression and localization and GEFT distribution, and thereby modulates RhoA activity. BVES overexpression decreases HCC cell extrusion in vitro and in vivo (orthotopic xenograft), and BVES suppression enhances tumor cell extrusion, promoting HCC metastasis.\",\n      \"method\": \"Co-immunoprecipitation, RhoA activity assay, silicone chamber and 3D cell culture extrusion models, orthotopic xenograft mouse model, immunofluorescence\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP interaction confirmed and in vivo extrusion model, mechanistic pathway partially characterized\",\n      \"pmids\": [\"36123685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Systemic AAV9-mediated delivery of human BVES to BVES-KO mice restores POPDC1 in cardiac and skeletal muscle and rescues body weight, muscle mass, muscle strength, exercise performance, and stress-induced heart rate abnormality. Intravenous delivery to adult KO mice after disease onset also provides substantial improvement, establishing BVES gene replacement as a viable therapeutic approach for LGMDR25.\",\n      \"method\": \"AAV9 vector systemic delivery in neonatal and adult KO mice, grip strength, treadmill exercise, histopathology, ECG under stress\",\n      \"journal\": \"Molecular therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gene rescue with multiple functional readouts, establishing causal role of BVES in disease\",\n      \"pmids\": [\"36433649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Bves/POPDC1 maintains the VSMC contractile phenotype through Dusp1 (dual-specificity protein phosphatase 1)-dependent suppression of p38MAPK and ERK1/2 signaling. Bves knockdown reduces Dusp1 expression and enhances p38MAPK and ERK1/2 activation; in vivo, VSMC-specific Bves and Dusp1 overexpression attenuates neointimal lesion formation in a rat graft arteriosclerosis model.\",\n      \"method\": \"In vivo rat graft arteriosclerosis model, RNA sequencing identifying Dusp1 correlation, siRNA knockdown and overexpression, p38MAPK/ERK1/2 phosphorylation Western blot, VSMC phenotypic marker analysis\",\n      \"journal\": \"Atherosclerosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptomic and functional linkage of BVES→Dusp1→MAPK pathway validated in vitro and in vivo\",\n      \"pmids\": [\"36037759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"POPDC1 dysfunction in popdc1(S201F) and popdc1 KO zebrafish alters cardiac electrophysiology including heart rate, AV delay, action potential and calcium transient upstroke speed and duration. SNS stress by β-adrenergic stimulation increases AV delay and leads to AV block in popdc1 mutant adult hearts, while reducing AP and CaT duration; arrhythmogenic effects are present from early development.\",\n      \"method\": \"Homozygous popdc1 and KO zebrafish larvae and adult isolated hearts, functional fluorescent analysis (AP and Ca2+ transient imaging), isoproterenol (β-AR) stimulation\",\n      \"journal\": \"Genes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo zebrafish model with multiple electrophysiological readouts, both developmental stages examined\",\n      \"pmids\": [\"38540339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BVES knockdown in zebrafish decreases expression of second heart field (SHF) regulatory genes NKX2.5, GATA4, and HAND2, and causes ventricular outflow tract stenosis and looping defects, partially rescued by bves mRNA and partially by nkx2.5 mRNA. Dual-fluorescence reporter assays show BVES positively regulates transcriptional activity of GATA4, NKX2.5, and HAND2 promoters.\",\n      \"method\": \"Zebrafish morpholino knockdown and mRNA rescue, reporter assay for transcription factor promoters, qPCR for SHF gene expression, cardiac morphology imaging\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via rescue in zebrafish with promoter-reporter mechanistic data, single lab\",\n      \"pmids\": [\"32843646\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"POPDC1 (BVES) is a plasma membrane-localized, three-transmembrane-domain protein that binds cAMP with high affinity through its conserved Popeye domain; it scaffolds a macromolecular complex with adenylyl cyclase 9 (AC9) and the TREK-1 potassium channel to regulate heart rate and cardiac pacemaking, interacts with VAMP3 to facilitate receptor/integrin recycling, binds ZO-1 and caveolin-3 to maintain tight junction and caveolae integrity, suppresses Rac1/Cdc42 activity via GEFT, negatively regulates ADCY9-cAMP-PKA-FoxO signaling to maintain skeletal muscle mass, interacts with POPDC2 through a helix-helix interface at the Popeye domain C-terminus for membrane trafficking, and acts as a tumour suppressor by promoting epithelial phenotype and c-Myc degradation via PP2A.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"POPDC1 (BVES) is a three-transmembrane-domain cAMP-binding protein that functions as a scaffolding hub at the plasma membrane, coupling cAMP-dependent signaling to cell adhesion, vesicular trafficking, and ion channel regulation in muscle and epithelial tissues. It directly binds and inhibits adenylyl cyclase 9, scaffolding AC9 with the TREK-1 potassium channel to control cardiac pacemaking, and negatively regulates cAMP–PKA signaling in skeletal muscle to prevent FoxO-driven atrophy [PMID:36254885, PMID:36997581]. At tight junctions, POPDC1 homodimerizes via cytoplasmic lysines 272/273 and interacts with ZO-1 to maintain epithelial barrier integrity, and its loss promotes epithelial–mesenchymal transition and amplified Wnt/c-Myc signaling through derepression of PR61α/PP2A-mediated c-Myc destruction [PMID:18493308, PMID:16188940, PMID:28389570]. The S201F missense mutation reduces cAMP-binding affinity and impairs POPDC1 membrane trafficking, causing limb-girdle muscular dystrophy with cardiac arrhythmia [PMID:26642364].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"POPDC1 was identified as a novel transmembrane cell adhesion molecule, establishing that it localizes to cell–cell contacts ahead of E-cadherin and confers adhesive properties to non-adherent cells.\",\n      \"evidence\": \"Immunostaining, subcellular fractionation, and L-cell adhesion assays in developing proepicardial cells\",\n      \"pmids\": [\"10208750\", \"11493530\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adhesion mechanism (homophilic vs. heterophilic) not defined\", \"Binding partner on opposing cell unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Loss-of-function in mice revealed that POPDC1 is required for adult skeletal muscle regeneration and is rapidly stabilized by β-adrenergic stimulation, first linking it to adrenergic/cAMP pathways in muscle.\",\n      \"evidence\": \"Pop1-LacZ null mice with cardiotoxin injury and isoproterenol treatment\",\n      \"pmids\": [\"11839816\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of protein stabilization by β-adrenergic signaling unresolved\", \"Direct cAMP binding not yet demonstrated\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Membrane topology was established — extracellular glycosylated N-terminus, three transmembrane domains, cytoplasmic C-terminus — and self-association was mapped to the cytoplasmic domain, resolving the basic structural framework.\",\n      \"evidence\": \"Glycosylation assays, exogenous glycosylation-site insertion, co-expression of truncated constructs in epicardial cells\",\n      \"pmids\": [\"12815060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution structure unavailable\", \"Which cytoplasmic residues mediate dimerization not yet pinpointed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"POPDC1 was shown to interact directly with ZO-1 and to be required for tight junction integrity and transepithelial resistance, establishing its functional role in epithelial barrier maintenance.\",\n      \"evidence\": \"GST pull-down, siRNA knockdown, TER measurement, Ca²⁺-switch assays in polarized epithelial cells\",\n      \"pmids\": [\"16188940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ZO-1 interaction is direct at endogenous levels in vivo not confirmed\", \"Relationship to adherens junction proteins not clarified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Two key mechanisms were resolved: homodimerization was mapped to lysines 272/273 essential for junction formation, and a direct interaction with GEFT was shown to suppress Rac1/Cdc42 signaling, linking POPDC1 to Rho-family GTPase regulation of cell morphology and motility.\",\n      \"evidence\": \"GST pull-down, SPOTs analysis, site-directed mutagenesis, GTPase activity assays, TER measurement\",\n      \"pmids\": [\"18493308\", \"18541910\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GEFT inhibition is regulated by cAMP unknown\", \"Whether dimerization and GEFT interaction are structurally coupled not addressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"POPDC1 was found to interact with VAMP3 and regulate vesicular recycling of transferrin receptor and β1-integrin, extending its function from a static adhesion molecule to a regulator of membrane trafficking.\",\n      \"evidence\": \"Co-immunoprecipitation, receptor recycling assays, Xenopus morpholino knockdown with gastrulation analysis\",\n      \"pmids\": [\"20057356\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of VAMP3 interaction undefined\", \"Whether VAMP3 interaction is cAMP-regulated not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Epigenetic silencing of BVES in colorectal cancer was shown to promote EMT and tumorigenesis, and dominant-negative BVES in epithelial cells activated RhoA and the ZONAB transcription factor, broadening POPDC1's role to tumor suppression and transcriptional regulation via junction signaling.\",\n      \"evidence\": \"Promoter methylation analysis, BVES re-expression in CRC lines, FRET-based RhoA assay, luciferase reporter for ZONAB, xenograft models\",\n      \"pmids\": [\"21911938\", \"21283798\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking BVES loss to RhoA activation not molecularly defined\", \"Direct transcriptional targets of ZONAB downstream of BVES loss unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"POPDC1 was found to associate with caveolin-3 and to be required for caveolae biogenesis and myocardial ischemia tolerance, and separately to interact with NDRG4 for fibronectin recycling, deepening its roles in cardiac membrane architecture and directed vesicular transport.\",\n      \"evidence\": \"Co-IP, density gradient co-sedimentation, electron microscopy of Popdc1-null hearts; TIRF microscopy and fibronectin recycling assays for NDRG4 interaction\",\n      \"pmids\": [\"24066022\", \"24048452\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How POPDC1 promotes caveolae formation mechanistically is unknown\", \"Whether NDRG4 and VAMP3 functions converge on the same trafficking pathway not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The S201F mutation was identified as causative for limb-girdle muscular dystrophy with cardiac arrhythmia, directly demonstrating that cAMP binding is essential for POPDC1 membrane trafficking and function, and establishing the first human Mendelian disease mechanism.\",\n      \"evidence\": \"Exome sequencing of patients, cAMP binding assay, HL-1 electrophysiology, zebrafish transgenic modeling\",\n      \"pmids\": [\"26642364\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of cAMP binding and how S201F disrupts it not resolved at atomic level\", \"Whether other POPDC1 mutations cause similar disease spectrum not comprehensively tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"POPDC1 was linked to Wnt pathway suppression via interaction with PR61α/PP2A to promote c-Myc degradation, and separately shown to restrain intestinal stem cell expansion, establishing dual tumor-suppressive axes in the gut.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, Bves-KO mouse AOM/DSS model, Lgr5-reporter intercross, 3D enteroid culture\",\n      \"pmids\": [\"28389570\", \"26891025\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PR61α interaction is cAMP-dependent unknown\", \"Direct phosphatase substrate linking PP2A to c-Myc destruction via BVES not identified\", \"Wnt amplification and PR61α mechanisms not yet unified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Proteomic interaction screens identified XIRP1 and ANO5 as POPDC1 partners in muscle, localizing POPDC1 with cytoskeletal and ion channel-associated proteins at intercalated discs, T-tubules, and ER membranes.\",\n      \"evidence\": \"Mass spectrometry pulldowns from human skeletal myotubes, co-IP from rat heart, BioID2 proximity labeling, CRISPR KO myoblast differentiation assay\",\n      \"pmids\": [\"33261556\", \"34963485\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional significance of XIRP1 interaction not tested beyond co-localization\", \"Whether ANO5 and POPDC1 jointly regulate ER-to-plasma-membrane trafficking unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"POPDC1 was established as a scaffold organizing AC9 and TREK-1 into a macromolecular complex that controls cardiac pacemaking: β-adrenergic stimulation triggers AC9-dependent cAMP production that dissociates TREK-1 from the complex and reverses POPDC1-mediated TREK-1 current enhancement, and separately POPDC1 was shown to modulate hippocampal LTP and VSMC phenotypic switching through cAMP–PKA signaling.\",\n      \"evidence\": \"Co-purification, co-IP, TREK-1 electrophysiology, Adcy9-KO mouse, hippocampal slice LTP in Popdc1-KO, VSMC Bves-KD with Dusp1/MAPK readouts and aortic graft rescue\",\n      \"pmids\": [\"36254885\", \"34937090\", \"36037759\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural basis of the AC9–POPDC1–TREK-1 complex unknown\", \"Whether the same complex exists in neurons or VSMCs not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The mechanism by which POPDC1 maintains skeletal muscle homeostasis was defined: POPDC1 physically inhibits ADCY9 activity, and its loss hyperactivates cAMP–PKA–FoxO signaling leading to proteasomal and autophagic muscle atrophy, reversible by AAV-BVES delivery.\",\n      \"evidence\": \"Co-IP, ADCY9 enzymatic assay, BVES-KO mouse muscle phenotyping, AAV-mediated rescue, PKA/FoxO/autophagy pathway analysis\",\n      \"pmids\": [\"36997581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether POPDC1 directly contacts ADCY9 catalytic domain or acts allosterically unresolved\", \"Contribution of POPDC2 to the same pathway not distinguished\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Zebrafish popdc1 S191F and knockout models confirmed that POPDC1 dysfunction impairs atrioventricular conduction and calcium handling, with β-adrenergic stress exacerbating AV block, consolidating the cardiac conduction disease mechanism.\",\n      \"evidence\": \"Fluorescent voltage/Ca²⁺ imaging in larval and adult zebrafish hearts, isoproterenol stimulation\",\n      \"pmids\": [\"38540339\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether AV node dysfunction is cell-autonomous or involves gap junction remodeling not resolved\", \"Mammalian cardiac-specific conditional KO electrophysiology data still lacking\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of POPDC1 — alone and in complex with cAMP, AC9, and TREK-1 — is needed to explain how cAMP binding allosterically controls partner interactions, and whether the diverse cellular functions (adhesion, trafficking, ion channel regulation, tumor suppression) reflect distinct or overlapping protein complexes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution structure of POPDC1 or its complexes\", \"Relative hierarchy among adhesion, trafficking, and signaling functions in different tissues unknown\", \"Whether cAMP binding uniformly governs all partner interactions not tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [14, 15]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 14, 15, 21]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 7, 8, 17]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 4]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 14, 15, 21]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [2, 4, 11, 13]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [10, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 9, 18]}\n    ],\n    \"complexes\": [\n      \"AC9–POPDC1–TREK-1 complex\"\n    ],\n    \"partners\": [\n      \"ADCY9\",\n      \"KCNK2\",\n      \"ZO-1\",\n      \"CAV3\",\n      \"VAMP3\",\n      \"ARHGEF25\",\n      \"NDRG4\",\n      \"XIRP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"POPDC1 (BVES) is a three-transmembrane-domain protein that functions as a high-affinity cAMP effector, scaffolding adaptor, and regulator of cell junction integrity in striated muscle, epithelial tissues, and the cardiac conduction system. Its conserved cytoplasmic Popeye domain binds cAMP and nucleates a macromolecular complex with adenylyl cyclase 9 (AC9) and the TREK-1 potassium channel, thereby coupling β-adrenergic signaling to cardiac pacemaker activity; knockout or loss-of-function mutations cause stress-induced sinus node dysfunction, AV block, and limb-girdle muscular dystrophy (LGMDR25) [PMID:22354168, PMID:26642364, PMID:36254885]. POPDC1 additionally maintains epithelial barrier integrity by interacting with ZO-1 and organizing the PAR polarity complex, suppresses Rho-family GTPase signaling through GEFT, facilitates VAMP3-dependent vesicular recycling of integrins and receptors, and negatively regulates ADCY9-cAMP-PKA-FoxO signaling to preserve skeletal muscle mass [PMID:16188940, PMID:18541910, PMID:20057356, PMID:36997581]. In intestinal and cancer epithelia, POPDC1 acts as a tumour suppressor by restraining Wnt/β-catenin-driven stemness and promoting c-Myc degradation via PP2A [PMID:26891025, PMID:28389570, PMID:21911938].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of POPDC1 as a conserved transmembrane protein enriched in developing heart and epicardium established it as a candidate cardiac/vascular differentiation marker whose function was unknown.\",\n      \"evidence\": \"Subtractive hybridization cloning with in situ and Northern blot in chick and mouse embryos; chromosomal mapping and topology prediction in human\",\n      \"pmids\": [\"10208750\", \"10441744\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional assay performed\", \"Three-TM topology was predicted, not biochemically confirmed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstration that POPDC1 localizes to lateral membranes at cell-cell contacts and confers adhesive behavior when expressed in non-adherent cells established it as a novel cell adhesion molecule required for epicardial cell migration.\",\n      \"evidence\": \"L-cell adhesion gain-of-function assay, antibody inhibition of proepicardial migration, immunofluorescence in polarized epithelial cells\",\n      \"pmids\": [\"11493530\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding partner mediating adhesion unknown\", \"Mechanism of adhesion (homophilic vs. heterophilic) not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Biochemical resolution of POPDC1 membrane topology (extracellular N-terminus, three TM helices, cytoplasmic C-terminus) and identification of C-terminal-mediated homodimerization provided a structural framework for understanding how it organizes signaling complexes.\",\n      \"evidence\": \"N-linked glycosylation assays, engineered glycosylation sites, co-expression of C-terminal fragments, detergent permeabilization\",\n      \"pmids\": [\"12815060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the Popeye domain not determined\", \"Stoichiometry of homodimer unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Discovery of a direct ZO-1 interaction and the requirement for POPDC1 in maintaining transepithelial resistance linked POPDC1 to tight junction regulation, answering how a transmembrane adhesion molecule connects to junctional signaling.\",\n      \"evidence\": \"GST pull-down of ZO-1 with POPDC1 C-terminus, siRNA knockdown with TER measurement, co-localization with ZO-1 and occludin\",\n      \"pmids\": [\"16188940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding site on ZO-1 not mapped\", \"Whether POPDC1 recruits ZO-1 or stabilizes existing complexes unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapping of the homodimerization motif (aa 268–274, K272/K273) and identification of GEFT as a binding partner that mediates Rac1/Cdc42 suppression revealed how POPDC1 integrates junction assembly with Rho-family GTPase signaling.\",\n      \"evidence\": \"SPOTs peptide array mutagenesis, TER and EMT readouts for dimerization mutants; co-IP of GEFT with Rac1/Cdc42 activity assays\",\n      \"pmids\": [\"18493308\", \"18541910\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GEFT and ZO-1 bind simultaneously or competitively not tested\", \"RhoA regulation showed conflicting directions across cell types (suppressed vs. enhanced depending on context)\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of VAMP3 as a direct POPDC1 partner and demonstration that POPDC1 is required for transferrin receptor and β1-integrin recycling established POPDC1 as a regulator of vesicular trafficking, explaining its role in cell migration and gastrulation.\",\n      \"evidence\": \"Co-immunoprecipitation with VAMP3, transferrin and integrin recycling assays, Xenopus morpholino knockdown with gastrulation phenotype\",\n      \"pmids\": [\"20057356\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether POPDC1 acts as cargo adaptor or fusion factor not resolved\", \"Connection between VAMP3-mediated recycling and tight junction maintenance not explored\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The breakthrough discovery that the Popeye domain is a high-affinity cAMP-binding module and that POPDC1 regulates TREK-1 channel surface expression in a cAMP-dependent manner, with knockout mice developing stress-induced sinus bradycardia, unified POPDC1's molecular identity as a cAMP effector controlling cardiac pacemaking.\",\n      \"evidence\": \"Competitive radiolabeled cAMP-binding assays, co-IP with TREK-1, electrophysiology, Popdc1 and Popdc2 KO mice with ECG telemetry\",\n      \"pmids\": [\"22354168\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of Popeye domain–cAMP complex unavailable\", \"Whether POPDC1 directly gates TREK-1 or acts through trafficking only not fully resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery that POPDC1 co-immunoprecipitates with caveolin-3 and is required for caveolae biogenesis (70% reduction in KO hearts) explained how POPDC1 loss increases cardiac vulnerability to ischemia/reperfusion injury.\",\n      \"evidence\": \"Co-IP and density-gradient co-sedimentation with caveolin-3, electron microscopy of caveolae, Langendorff I/R injury model in KO mice\",\n      \"pmids\": [\"24066022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether caveolae loss is cause or consequence of POPDC1 absence not distinguished\", \"Stoichiometry and direct binding site between POPDC1 and caveolin-3 not mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of a homozygous POPDC1(S201F) mutation in patients with cardiac arrhythmia and limb-girdle muscular dystrophy (LGMDR25), with 50% reduced cAMP affinity and impaired membrane trafficking of POPDC1-POPDC2 complexes, provided the first human genetic proof that POPDC1 cAMP-binding is essential for striated muscle and cardiac function.\",\n      \"evidence\": \"Whole-exome sequencing in patient family, cAMP-binding affinity assays, patient muscle immunofluorescence, HL-1 electrophysiology, zebrafish knock-in model\",\n      \"pmids\": [\"26642364\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether S201F fully phenocopies null or is hypomorphic not resolved\", \"Genotype-phenotype correlation across different POPDC1 mutations incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Studies in intestinal epithelium and colitis-associated cancer demonstrated that POPDC1 negatively regulates Wnt-driven intestinal stem cell programs and promotes c-Myc degradation through PP2A, establishing a tumour-suppressive mechanism operating through two distinct pathways.\",\n      \"evidence\": \"Bves KO mice with Lgr5-EGFP reporter, 3D enteroid culture, AOM/DSS cancer model, yeast two-hybrid identification of PP2A interaction, c-Myc Western blot\",\n      \"pmids\": [\"26891025\", \"28389570\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How POPDC1-PP2A interaction is regulated by cAMP not tested\", \"Whether Wnt suppression and c-Myc degradation are mechanistically linked or parallel not clarified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Reconstitution of the POPDC1–AC9–TREK-1 macromolecular complex showed that POPDC1 scaffolds AC9 independently of cAMP while β-adrenergic stimulation triggers AC9-dependent release of TREK-1, providing a detailed mechanism for how the sinoatrial pacemaker integrates sympathetic input.\",\n      \"evidence\": \"Co-purification with AC9 activity, TREK-1 current recordings, AC9 KO mice with ECG telemetry, β-adrenergic stimulation\",\n      \"pmids\": [\"36254885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for AC9–POPDC1 interaction not resolved\", \"Whether this ternary complex exists in non-cardiac tissues unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mapping of the POPDC1-POPDC2 heteromeric interface to conserved hydrophobic residues at the Popeye domain C-terminus, using four independent interaction methods, revealed that disease-causing mutations disrupting this interface impair membrane trafficking more severely than those preserving it.\",\n      \"evidence\": \"Co-IP, PLA, BRET, BiFC with site-directed mutagenesis of conserved hydrophobic residues; patient biopsy immunostaining\",\n      \"pmids\": [\"36624536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of POPDC1-POPDC2 heterodimer unavailable\", \"Whether POPDC3 uses the same interface not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstration that POPDC1 negatively regulates ADCY9-cAMP-PKA signaling in skeletal muscle and that its loss activates FoxO-mediated proteolysis and autophagy causing muscle wasting—reversible by AAV-BVES gene replacement—defined the molecular basis of LGMDR25 muscle pathology.\",\n      \"evidence\": \"BVES KO mice, co-IP with ADCY9, cAMP/PKA activity assays, FoxO/proteasome/autophagy pathway analysis, AAV-mediated rescue of muscle mass and function\",\n      \"pmids\": [\"36997581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether POPDC1 directly inhibits AC9 catalytic activity or sequesters substrate not distinguished\", \"Relative contributions of proteasome vs. autophagy to muscle loss not quantified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the atomic structure of the Popeye domain in complex with cAMP and partner proteins, the mechanistic basis for tissue-specific regulation of Rho GTPases versus cAMP/PKA pathways, and whether the diverse functions (junction maintenance, vesicular recycling, pacemaking, tumour suppression) are cAMP-dependent or represent cAMP-independent scaffolding roles.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of the Popeye domain available\", \"cAMP-dependence of ZO-1, VAMP3, and PP2A interactions not tested\", \"Systematic interactome across tissues not performed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [11, 14, 25]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [9, 14, 25, 28]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [3, 6, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5, 14, 16, 27]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [11, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [14, 25, 26, 28]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [14, 25, 32]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [6, 8, 15]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [11, 17]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [18, 27, 30]}\n    ],\n    \"complexes\": [\n      \"POPDC1-AC9-TREK-1 pacemaker complex\",\n      \"POPDC1-POPDC2 heterodimer\"\n    ],\n    \"partners\": [\n      \"KCNK2\",\n      \"ADCY9\",\n      \"POPDC2\",\n      \"TJP1\",\n      \"VAMP3\",\n      \"GEFT\",\n      \"CAV3\",\n      \"XIRP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}