{"gene":"BMPER","run_date":"2026-04-28T17:12:38","timeline":{"discoveries":[{"year":2003,"finding":"BMPER is a secreted protein that directly interacts with BMP2, BMP4, and BMP6, and antagonizes BMP4-dependent Smad5 activation in endothelial cell precursors. It contains an amino-terminal signal peptide, five cysteine-rich domains, a von Willebrand D domain, and a trypsin inhibitor domain.","method":"Direct protein binding assays, Smad5 activation assays, Xenopus ventral injection axis duplication assay, embryoid body differentiation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (binding assay, signaling readout, in vivo Xenopus model, embryoid body assay) in foundational paper","pmids":["12897139"],"is_preprint":false},{"year":2008,"finding":"BMPER is an extracellular matrix protein expressed by endothelial cells and acts as a downstream target of FoxO3a. It promotes endothelial cell sprouting and migration and is necessary for BMP4-induced Smad1/5 phosphorylation and Erk1/2 activation. BMP4 and BMPER are mutually required for their respective activities.","method":"Western blotting, immunocytochemistry, siRNA knockdown, in vitro sprouting/migration assays, in vivo zebrafish model, Smad1/5 phosphorylation assay","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KD phenotype, signaling assay, in vivo) with strong mechanistic follow-up","pmids":["18787191"],"is_preprint":false},{"year":2009,"finding":"At molar concentrations exceeding BMP4, BMPER switches from a BMP activator to an inhibitor via a novel endocytic trap-and-sink mechanism, leading to lysosomal degradation of both BMPER and BMP4, reducing the duration and magnitude of BMP4-dependent Smad signaling. Noggin and Gremlin, but not Chordin, trigger similar BMP endocytosis.","method":"Dose-response signaling assays, endocytosis tracking, lysosomal inhibition experiments, Smad reporter assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 — mechanistic endocytic pathway established with multiple orthogonal approaches including pharmacological inhibition and dose-dependent signaling readouts","pmids":["19221194"],"is_preprint":false},{"year":2007,"finding":"Zebrafish BMPER ortholog (zbmper) is expressed at sites of BMP activity including vascular precursor cells. Knockdown of zbmper results in a dorsalized phenotype, reduced hematopoietic precursors, and vascular patterning defects, establishing a conserved role in vascular and hematopoietic development.","method":"Morpholino knockdown in zebrafish, in situ hybridization, gata1 marker analysis","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 — in vivo loss-of-function with defined cellular phenotype, replicated across zebrafish and mouse models","pmids":["17618647"],"is_preprint":false},{"year":2009,"finding":"Cv2 (mouse BMPER ortholog) acts as a pro-BMP factor in nephron precursor development through Twisted gastrulation (Tsg). Cv2-null mice show reduced cap condensates and lower pSmad1 levels. The renal defects of Cv2-/- are fully suppressed by Tsg null mutation, placing Cv2 upstream of Tsg in the BMP signaling hierarchy for nephrogenesis.","method":"Genetic epistasis (double knockout), immunostaining for pSmad1, embryonic kidney cell line assays","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1–2 — genetic epistasis with double mutant rescue, multiple orthogonal in vivo and in vitro methods","pmids":["19914233"],"is_preprint":false},{"year":2011,"finding":"BMPER modulates vascular inflammation by suppressing TNFα-NFκB signaling. BMPER is downregulated by the TNFα-NFκB-KLF2 pathway. Loss of BMPER (siRNA or BMPER+/- mice) induces proinflammatory endothelial phenotype with reduced eNOS and enhanced adhesion molecule expression, increased leukocyte adhesion. The anti-inflammatory effects of BMPER are dependent on BMP signaling through NFκB.","method":"siRNA knockdown, BMPER+/- mouse model, intravital microscopy, ex vivo and in vivo leukocyte adhesion assays, eNOS/adhesion molecule expression","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — in vivo and in vitro loss-of-function with mechanistic pathway placement via NFκB","pmids":["21900199"],"is_preprint":false},{"year":2011,"finding":"BMPER is a negative regulator of hepcidin. Soluble BMPER peptide inhibits BMP2- and BMP6-dependent hepcidin promoter activity and reduces pSMAD1/5/8 levels in hepatocytes. Injection of BMPER peptide into mice reduces liver hepcidin and increases serum iron levels.","method":"Hepcidin promoter reporter assays in HepG2 and HuH7 cells, primary human hepatocyte treatment, in vivo BMPER peptide injection with iron and hepcidin measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — in vitro and in vivo mechanistic studies with defined pathway (BMP/SMAD/hepcidin)","pmids":["22144676"],"is_preprint":false},{"year":2012,"finding":"Bmper haploinsufficiency in ApoE-/- mice leads to increased atherosclerosis with elevated BMP activity in endothelial cells. siRNA knockdown of Bmper in HUVECs dramatically increases ICAM-1 and VCAM-1 expression at rest and under shear stress, identifying Bmper as a critical regulator of BMP-mediated vascular inflammation.","method":"ApoE-/-/Bmper+/- mouse model, siRNA knockdown, ICAM-1/VCAM-1 expression, atherosclerotic plaque quantification, shear stress experiments","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic model plus in vitro mechanistic KD with defined inflammatory readouts","pmids":["22772758"],"is_preprint":false},{"year":2012,"finding":"BMPER promotes osteoblast-like differentiation of human coronary artery smooth muscle cells (HCASMCs) by antagonizing BMP-2-induced Smad1/5/8 phosphorylation and by increasing IκBα phosphorylation and NF-κB activity. NF-κB decoy oligonucleotides impair BMPER-induced osteoblast-like differentiation.","method":"RNA interference, recombinant BMPER treatment, Smad1/5/8 phosphorylation assay, NF-κB reporter, alkaline phosphatase and mineralization assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple signaling pathway assays with functional readout (osteoblast differentiation markers)","pmids":["22778264"],"is_preprint":false},{"year":2013,"finding":"BMPER-regulated BMP signaling is critical for coronary plexus remodeling. BMPER-/- embryos show atretic coronary arteries or distal connections. BMPER directly binds BMP2 and blocks BMP2-induced Smad activation in a dose-dependent manner. BMPER inhibits BMP2-induced Sox9 increase during endocardial cushion EMT.","method":"BMPER-/- mouse embryo analysis, in vitro tubulogenesis, migration assay, pulldown/binding assay, Smad activation quantification, Sox9 immunostaining","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with defined developmental phenotype plus in vitro mechanistic binding and signaling assays","pmids":["24373957"],"is_preprint":false},{"year":2013,"finding":"BMPER and Tsg cooperate in BMP pathway modulation to control endothelial cell angiogenesis. Both proteins show concentration-dependent proangiogenic activity via Akt, Erk, and Smad signaling. BMPER and Tsg interfere with each other to enhance proangiogenic events; in vivo, both are required for normal zebrafish vascular development.","method":"Matrigel assay, HUVEC sprouting/migration/proliferation, siRNA knockdown, Akt/Erk/Smad signaling assays, zebrafish morpholino knockdown","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — multiple in vitro and in vivo approaches with defined signaling pathway measurements","pmids":["23641068"],"is_preprint":false},{"year":2014,"finding":"BMPER promotes angiogenesis in endothelial cells by upregulating bFGF/FGF-2 expression and FGF receptor-1 expression and phosphorylation, and downregulating thrombospondin-1. The proangiogenic effect of BMPER is blocked by an anti-bFGF antibody. In Bmper+/- mice, aortic ring assays confirm a specific effect for bFGF but not VEGF.","method":"Angiogenesis antibody array, siRNA knockdown, anti-bFGF neutralizing antibody, Matrigel/spheroid/migration assays, in vivo Matrigel plug assay, aortic ring assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple in vitro and in vivo methods with pathway-specific blocking experiments","pmids":["25503991"],"is_preprint":false},{"year":2009,"finding":"KLF15 directly activates BMPER expression by binding to a KLF-binding element at -284 bp within the BMPER promoter. Sp1 antagonizes KLF15-induced BMPER promoter activation. Endothelin-1 downregulates BMPER expression via the ETB receptor by suppressing KLF15.","method":"BMPER promoter deletion analysis, gelshift/EMSA assays, KLF15 overexpression and siRNA knockdown, promoter reporter assays, ET-receptor antagonist (BQ788)","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 1–2 — direct DNA binding confirmed by EMSA, promoter reporters, and pharmacological pathway dissection","pmids":["19767294"],"is_preprint":false},{"year":2009,"finding":"Statins upregulate BMPER expression in endothelial cells mainly through a posttranscriptional mechanism (prolonged RNA half-life) via the RhoA/ROCK/actin pathway. BMPER upregulation by mevastatin is prevented by RhoA activators and enhanced by RhoA/ROCK/actin inhibitors. Increasing BMPER concentrations downregulate ICAM-1 expression and have anti-inflammatory effects.","method":"Actinomycin D chase analysis, BMPER promoter reporter assays, RhoA pathway activators/inhibitors (C3-toxin, RhoAN19, fasudil, cytochalasin D), RT-PCR, Western blotting, ICAM-1 expression assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1–2 — mechanism of RNA stabilization determined with multiple pharmacological tools and reporters","pmids":["20042706"],"is_preprint":false},{"year":2017,"finding":"BMPER is a novel positive regulator of HSC maturation in the AGM region. BMPER is associated with BMP signaling inhibition but is transcriptionally induced by BMP4, suggesting BMPER contributes to the precise control of BMP activity enabling HSC maturation in a BMP-negative environment.","method":"RNA sequencing of AGM spatiotemporal transitions, ex vivo reaggregate culture system, BMP4 stimulation, HSC maturation assay","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2–3 — ex vivo functional assay with signaling context, single lab","pmids":["29093060"],"is_preprint":false},{"year":2017,"finding":"BMPER activates nuclear factor of activated T cells c1 (NFATc1) in endothelial cells through multiple BMP-independent signaling pathways: LRP1-ERK activation, calcineurin signaling, and LRP1β-mediated NF45 nuclear export. BMPER-induced NFATc1 activation is required for lipopolysaccharide-induced vascular inflammation.","method":"BMPER+/- mouse LPS challenge, survival assay, cytokine measurement, NFATc1 reporter assays, LRP1 interaction studies, calcineurin inhibition, NF45 nuclear export assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple signaling pathways dissected in vitro and in vivo with functional endpoint","pmids":["28596374"],"is_preprint":false},{"year":2017,"finding":"BMPER regulates endothelial barrier function by maintaining VE-cadherin expression. BMPER knockdown reduces VE-cadherin and impairs endothelial barrier through enhanced BMP4-Smad-Id1 signaling. High levels of BMPER antagonize BMP4-Smad5-Id1 signaling and prevent VE-cadherin downregulation and endothelial leakage in vivo.","method":"BMPER+/- mouse Evans blue dye leakage, siRNA knockdown, FITC-dextran transwell permeability assay, VE-cadherin expression analysis, Smad-Id1 signaling assay","journal":"Inflammation","confidence":"High","confidence_rationale":"Tier 2 — in vivo and in vitro mechanistic studies with defined pathway (BMP4-Smad-Id1-VE-cadherin)","pmids":["27995357"],"is_preprint":false},{"year":2015,"finding":"BMPER promotes epithelial-mesenchymal transition (EMT) during cardiac cushion development by modulating BMP2-induced Smad and Sox9 activity. BMPER directly binds BMP2 and dose-dependently blocks BMP2-induced Smad activation. In BMPER-/- embryos, canonical BMP pathway is more active in AV cushions during EMT, resulting in increased Sox9-positive cells.","method":"BMPER-/- embryo histology, direct BMP2 binding assay, Smad activation quantification, Sox9 immunostaining, in vitro endothelial cell BMP2/BMPER co-treatment","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic KO with mechanistic in vitro binding and signaling validation","pmids":["26418455"],"is_preprint":false},{"year":2018,"finding":"BMPER and TWSG1 activate arteriovenous specification in zebrafish endothelial cells by stimulating Notch signaling targets (HEY1/2, EPHRINB2). Silencing of bmper and twsg1b in zebrafish results in enhanced venous marker expression and dysregulated arterial marker expression. BMP receptor antagonist DMH1 abolishes BMPER and BMP4-induced Notch signaling.","method":"Zebrafish morpholino knockdown, in situ hybridization for arteriovenous markers, qRT-PCR, Western blot for Notch targets, DMH1 BMP receptor antagonism","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 2 — in vivo and in vitro mechanistic dissection of BMP-Notch pathway crosstalk","pmids":["29473997"],"is_preprint":false},{"year":2018,"finding":"BMPER binds Tsg through its N-terminal BMP-binding region; this N-terminal fragment alone inhibits BMP-4 signaling more potently than full-length BMPER. BMPER and Tsg cooperatively inhibit BMP-4 signaling. Full-length BMPER is targeted to the plasma membrane via C-terminal heparan sulphate proteoglycan binding, while an active cleavage fragment is diffusible. A disease-causing P370L mutation prevents intracellular cleavage.","method":"Pulldown/binding assay, BMP-4 signaling reporter assays, SAXS and electron microscopy structural analysis, heparan sulphate proteoglycan binding assay, P370L mutant analysis, intracellular cleavage assay","journal":"Matrix biology","confidence":"High","confidence_rationale":"Tier 1 — structural analysis (SAXS/EM), in vitro binding, mutagenesis, and signaling assays in one study","pmids":["30125619"],"is_preprint":false},{"year":2011,"finding":"BMPER promotes tumor growth and angiogenesis in lung carcinoma cells; its loss impairs proliferation, migration, invasion, and tumor cell-induced endothelial sprout formation. BMPER effects are transduced via regulation of Id1 (BMP target transcription factor) and MMP-9 and MMP-2.","method":"siRNA knockdown in A549 cells, proliferation/migration/invasion assays, in vivo Lewis lung carcinoma mouse model, Id1 and MMP expression analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo and in vitro KD with defined molecular pathway, single lab","pmids":["22020334"],"is_preprint":false},{"year":2021,"finding":"BMPER alleviates ischemic brain injury by activating the Smad3/Akt/Nrf2 pathway in neurons. BMPER administration reduces infarct size, brain edema, neuroinflammation, and cell death after MCAO. In OGD/R-challenged neurons, BMPER activates Smad3/Akt/Nrf2 signaling.","method":"MCAO mouse model, primary neuron OGD/R in vitro model, Western blotting for Smad3/Akt/Nrf2, immunohistochemistry, infarct measurement","journal":"CNS neuroscience & therapeutics","confidence":"Medium","confidence_rationale":"Tier 2–3 — in vivo and in vitro with pathway analysis, single lab","pmids":["34904361"],"is_preprint":false},{"year":2021,"finding":"BMPER inhibits TGF-β1-induced tubular dedifferentiation and fibroblast activation. Exogenous BMPER inhibits Id-1 upregulation, prevents E-cadherin loss, and suppresses fibroblast activation by inhibiting Erk1/2 phosphorylation. This Erk1/2 inhibition is abolished by LRP1 knockdown, identifying LRP1 as the BMPER receptor mediating this effect.","method":"siRNA knockdown, exogenous BMPER treatment, Erk1/2 phosphorylation assay, LRP1 knockdown, UUO mouse model with BMPER gene delivery","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — receptor identification via knockdown epistasis, in vivo and in vitro, single lab","pmids":["33644047"],"is_preprint":false},{"year":2024,"finding":"High fluid shear stress (FSS) suppresses Smad1/5 by elevating KLF2, which induces BMPER, thereby de-inhibiting Akt to facilitate outward vascular remodeling. Endothelial BMPER deletion impairs blood flow recovery and vascular remodeling in mice. This establishes the KLF2-BMPER-Smad1/5 axis as a mechanosensitive checkpoint.","method":"Surgical high FSS mouse model, endothelial-specific BMPER deletion, KLF2/BMPER/Smad1/5/Akt pathway analysis, diabetic mouse models with BMP9/10 blocking antibodies","journal":"Nature cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — in vivo endothelial KO with defined mechanosensitive signaling pathway, multiple disease models","pmids":["39196179"],"is_preprint":false},{"year":2023,"finding":"BMPER is required for adipogenesis in 3T3-L1 preadipocytes and mouse adipose progenitor cells; BMPER expression and release peak at day 4 post-differentiation. BMPER is a conserved marker of adipose progenitor cells and adipocytes in visceral adipose tissue.","method":"siRNA knockdown in 3T3-L1 preadipocytes, mouse APC differentiation assays, lentiviral KD, single-cell/single-nucleus RNA-seq","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2–3 — loss-of-function with defined cellular phenotype, but mechanistic pathway not fully delineated","pmids":["37311809"],"is_preprint":false},{"year":2023,"finding":"BMPER stimulation of vascular smooth muscle cells (vSMCs) promotes a contractile phenotype; BMPER silencing increases proliferation, migration, and reduces contractibility. BMPER binds IGFBP4, modulating IGF signaling. Perivascular BMPER application prevents neointima formation in a mouse carotid ligation model.","method":"siRNA knockdown and recombinant BMPER treatment of primary vSMCs, Bmper+/- mouse carotid ligation model, IGFBP4 binding assay, contractility/proliferation/migration assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2–3 — binding partner identified, in vivo and in vitro phenotypic data, single lab","pmids":["36902380"],"is_preprint":false},{"year":2025,"finding":"Endothelial BMPER promotes pulmonary arterial hypertension by activating YAP in pulmonary artery smooth muscle cells through releasing YAP from sequestration by LRP1 at the cell membrane. Endothelial-specific BMPER overexpression causes spontaneous PH; BMPER depletion attenuates pulmonary vascular remodeling via LRP1-YAP mechanism.","method":"Global and endothelial cell-specific BMPER knockout mice, AAV-assisted BMPER overexpression, hypoxia-induced PH model, LRP1 co-depletion epistasis, YAP activation assays, right ventricular pressure measurement","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis (double depletion), gain and loss of function in vivo, defined LRP1-YAP mechanism","pmids":["40964716"],"is_preprint":false},{"year":2024,"finding":"SUGP2 knockdown causes abnormal alternative splicing of CIRBP pre-mRNA, increasing CIRBP V1, which increases BMPER mRNA stability and translation. Elevated BMPER then downregulates pSMAD1/5 and hepcidin (HAMP), establishing a SUGP2/CIRBP/BMPER/SMAD/hepcidin axis in hemochromatosis.","method":"RNA-seq, RNA-protein pull-down, RNA immunoprecipitation, SUGP2 p.Arg622Gln CRISPR knock-in mice, Western blot for pSMAD1/5 and hepcidin, BMPER mRNA stability assay","journal":"American journal of hematology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple molecular methods in one study establishing upstream regulatory pathway, single lab","pmids":["38800953"],"is_preprint":false},{"year":2025,"finding":"NSUN6 stabilizes BMPER expression in an m5C-dependent manner in hepatocellular carcinoma. BMPER knockdown reverses the tumor-suppressive effects of NSUN6 overexpression, establishing NSUN6 as an upstream regulator of BMPER through mRNA methylation-dependent stability.","method":"MeRIP-seq, actinomycin-D mRNA stability assay, luciferase reporter, NSUN6 overexpression in HCC cells and PDX mouse model, BMPER rescue experiment","journal":"Biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic epistasis confirmed by rescue, mRNA stability assay, and in vivo model, single lab","pmids":["40589169"],"is_preprint":false},{"year":2015,"finding":"BMPER expression in lung fibroblasts is regulated by DNA methylation; demethylation with 5'-azacytidine decreases BMPER expression and attenuates fibroblast invasion/migration. siRNA-mediated BMPER reduction impairs fibroblast migration and invasion in IPF fibroblasts.","method":"5'-azacytidine demethylation treatment, siRNA knockdown, invasion/migration assays, in vivo mouse fibrosis model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2–3 — epigenetic regulatory mechanism and loss-of-function phenotype established, single lab","pmids":["26442443"],"is_preprint":false}],"current_model":"BMPER is a secreted extracellular BMP-binding glycoprotein that acts as a concentration-dependent, context-dependent modulator of BMP signaling: at low concentrations it acts as a BMP co-activator (facilitating Smad1/5 phosphorylation and Erk activation), while at high concentrations it sequesters BMPs via an endocytic trap-and-sink mechanism for lysosomal degradation; it directly binds BMP2, BMP4, and BMP6, interacts with co-modulators Tsg and IGFBP4, is targeted to the cell surface via heparan sulphate proteoglycans, undergoes intracellular cleavage to generate a diffusible active N-terminal fragment, signals through LRP1 to activate NFATc1 and regulate Erk and YAP, is transcriptionally regulated by KLF15 (activated) and endothelin-1/RhoA/ROCK (suppressed), and plays essential roles in vascular development, angiogenesis, arteriovenous specification (via BMP-Notch crosstalk), endothelial barrier integrity (via VE-cadherin), hematopoietic stem cell maturation, hepcidin regulation, cardiac valve EMT, and smooth muscle cell phenotype maintenance."},"narrative":{"teleology":[{"year":2003,"claim":"Identification of BMPER as a secreted BMP-binding protein that antagonizes BMP4-dependent Smad5 activation established the gene as a new extracellular BMP modulator distinct from known antagonists like Noggin and Chordin.","evidence":"Direct binding assays, Smad5 activation assays, Xenopus axis duplication, and embryoid body differentiation","pmids":["12897139"],"confidence":"High","gaps":["Whether BMPER could also function as a BMP activator was not tested","The receptor through which BMPER signals was unknown","In vivo mammalian loss-of-function data were lacking"]},{"year":2007,"claim":"Zebrafish loss-of-function revealed that BMPER is required in vivo for vascular patterning and hematopoietic precursor specification, extending its role from a biochemical antagonist to a developmental regulator of vasculogenesis and hematopoiesis.","evidence":"Morpholino knockdown in zebrafish with vascular and hematopoietic marker analysis","pmids":["17618647"],"confidence":"High","gaps":["Whether BMPER has a pro-BMP or anti-BMP net effect in vivo was unresolved","Mammalian genetic confirmation was pending"]},{"year":2008,"claim":"The paradoxical discovery that BMPER is required for BMP4-induced Smad1/5 phosphorylation and promotes endothelial sprouting overturned the simple antagonist model and established BMPER as a bipotential modulator of BMP signaling.","evidence":"siRNA knockdown in endothelial cells with Smad1/5 phosphorylation, Erk1/2 activation, sprouting/migration assays, and zebrafish validation","pmids":["18787191"],"confidence":"High","gaps":["The mechanism underlying the switch from activator to inhibitor was unknown","Whether dose was the determining variable was untested"]},{"year":2009,"claim":"Three concurrent advances resolved the activator/inhibitor paradox, defined transcriptional control, and uncovered post-transcriptional regulation: BMPER switches from activator to inhibitor at high molar ratios via endocytic routing of BMP4 to lysosomes; KLF15 directly activates BMPER transcription while endothelin-1 suppresses it; and statins stabilize BMPER mRNA through RhoA/ROCK inhibition.","evidence":"Dose-response signaling with lysosomal inhibition (trap-and-sink); EMSA/promoter reporter for KLF15 binding; actinomycin-D chase with RhoA pathway pharmacology","pmids":["19221194","19767294","20042706"],"confidence":"High","gaps":["The endocytic receptor mediating BMPER–BMP internalization was unidentified","Whether the cleavage products of BMPER have distinct activities was unknown","Genetic epistasis with known BMP modulators in mammals was lacking"]},{"year":2009,"claim":"Genetic epistasis in Cv2 (BMPER) and Tsg double-knockout mice demonstrated that BMPER acts as a pro-BMP factor upstream of Tsg during nephrogenesis, providing the first mammalian genetic evidence for tissue-specific BMP co-activation.","evidence":"Cv2-null and Cv2/Tsg double-null mouse kidney phenotyping with pSmad1 immunostaining","pmids":["19914233"],"confidence":"High","gaps":["Whether the Cv2–Tsg epistasis applies to vascular contexts was untested","The biochemical mechanism of BMPER–Tsg cooperation remained unclear"]},{"year":2011,"claim":"BMPER was linked to vascular inflammation and iron homeostasis: loss of BMPER de-represses TNFα-NF-κB signaling and adhesion molecule expression in endothelium, while soluble BMPER inhibits BMP-dependent hepcidin expression and raises serum iron in vivo.","evidence":"BMPER+/- mice with intravital leukocyte adhesion; BMPER peptide injection with hepatic hepcidin and iron measurement; siRNA in HUVECs and hepatocytes","pmids":["21900199","22144676"],"confidence":"High","gaps":["The receptor for BMPER's anti-inflammatory effect was unidentified","Whether BMPER directly signals in hepatocytes or acts only as a BMP sink was unclear"]},{"year":2012,"claim":"BMPER was shown to promote osteoblast-like differentiation of coronary smooth muscle cells via NF-κB activation, and Bmper haploinsufficiency in ApoE-null mice increased atherosclerotic burden, linking BMPER to vascular calcification and disease.","evidence":"ApoE−/−/Bmper+/− atherosclerosis quantification; NF-κB decoy oligonucleotides blocking BMPER-induced SMC osteogenic differentiation","pmids":["22772758","22778264"],"confidence":"High","gaps":["Whether BMPER's pro-osteogenic and anti-inflammatory roles represent cell-type-specific effects was untested","The surface receptor mediating BMPER effects on SMCs was unknown"]},{"year":2013,"claim":"BMPER-null embryos displayed atretic coronary arteries and dysregulated endocardial cushion EMT with excessive Sox9 expression, establishing BMPER as essential for coronary remodeling and cardiac valve morphogenesis through dose-dependent BMP2 antagonism.","evidence":"BMPER−/− mouse embryo coronary and cushion phenotyping, BMP2 binding and Smad activation dose-response assays","pmids":["24373957","23641068"],"confidence":"High","gaps":["The relationship between the coronary and cushion phenotypes was unclear","Whether the embryonic lethality was primarily vascular or cardiac was not resolved"]},{"year":2015,"claim":"BMPER was found to promote angiogenesis by upregulating bFGF/FGFR-1 and downregulating thrombospondin-1, and to regulate cardiac cushion EMT through BMP2-Smad-Sox9, establishing cross-pathway effector mechanisms beyond BMP–Smad alone.","evidence":"Anti-bFGF neutralizing antibody blocking BMPER angiogenesis; BMPER−/− AV cushion Sox9 quantification; aortic ring assays in Bmper+/− mice","pmids":["25503991","26418455"],"confidence":"High","gaps":["How BMPER activates bFGF transcription was not determined","Whether bFGF induction depends on BMP signaling or is a BMP-independent BMPER function was unclear"]},{"year":2017,"claim":"The discovery that BMPER signals through LRP1 to activate NFATc1 via ERK and calcineurin pathways, independently of canonical BMP receptors, identified the first BMP-independent receptor-mediated signaling axis for BMPER and linked it to sepsis-related vascular inflammation.","evidence":"BMPER+/− mouse LPS challenge, LRP1 interaction studies, NFATc1 reporter assays, calcineurin inhibition","pmids":["28596374"],"confidence":"High","gaps":["The BMPER–LRP1 binding interface was uncharacterized","Whether LRP1 mediates the endocytic trap-and-sink mechanism was untested"]},{"year":2017,"claim":"BMPER was shown to maintain endothelial barrier integrity by sustaining VE-cadherin expression through inhibition of BMP4-Smad5-Id1 signaling, and to promote hematopoietic stem cell maturation in the AGM region, broadening its functional repertoire.","evidence":"BMPER+/− Evans blue permeability, siRNA VE-cadherin/Id1 assays; AGM reaggregate HSC maturation culture","pmids":["27995357","29093060"],"confidence":"High","gaps":["Whether barrier function and HSC maturation share the same BMPER concentration threshold was unknown","In vivo HSC-specific BMPER deletion data were lacking"]},{"year":2018,"claim":"Structural and biochemical analysis revealed that BMPER's N-terminal fragment is generated by intracellular cleavage, binds both BMP-4 and Tsg, and is more potent than full-length BMPER, while the full-length protein is tethered at the cell surface via C-terminal heparan sulfate proteoglycan binding; additionally, BMPER and TWSG1 cooperate to activate Notch signaling for arteriovenous specification.","evidence":"SAXS/EM structural analysis, cleavage/binding assays, P370L disease mutant analysis; zebrafish morpholino with Notch target readouts, DMH1 BMP receptor antagonist","pmids":["30125619","29473997"],"confidence":"High","gaps":["The protease responsible for BMPER cleavage was not identified","Whether the P370L mutation causes disease solely through cleavage deficiency was unresolved","Crystal structure of BMPER–BMP or BMPER–Tsg complex was lacking"]},{"year":2023,"claim":"BMPER was found to bind IGFBP4 and maintain the contractile phenotype of vascular smooth muscle cells, preventing neointima formation, and separately shown to be required for adipocyte differentiation, extending its roles to IGF signaling modulation and metabolic biology.","evidence":"IGFBP4 binding assay, Bmper+/− carotid ligation model; siRNA in 3T3-L1 and mouse adipose progenitor cells with scRNA-seq","pmids":["36902380","37311809"],"confidence":"Medium","gaps":["The structural basis for BMPER–IGFBP4 interaction is unknown","Whether BMPER's adipogenic role is BMP-dependent or BMP-independent was not determined","Independent replication of the IGFBP4 interaction is needed"]},{"year":2024,"claim":"A mechanosensitive KLF2–BMPER–Smad1/5–Akt axis was identified as a checkpoint for outward vascular remodeling under high fluid shear stress, using endothelial-specific BMPER deletion, and separately BMPER was placed in the SUGP2/CIRBP/BMPER/SMAD/hepcidin iron regulatory pathway.","evidence":"Endothelial-specific BMPER KO in high-FSS mouse model; SUGP2 CRISPR knock-in mice with BMPER mRNA stability and pSMAD1/5 analysis","pmids":["39196179","38800953"],"confidence":"High","gaps":["Whether the KLF2–BMPER axis operates in human arteriogenesis is untested","The relative contribution of BMPER versus other BMP antagonists to hepcidin regulation in vivo is unclear"]},{"year":2025,"claim":"Endothelial BMPER was shown to promote pulmonary arterial hypertension by releasing YAP from LRP1-mediated sequestration at the smooth muscle cell membrane, establishing a paracrine BMPER–LRP1–YAP axis in pulmonary vascular remodeling.","evidence":"Endothelial-specific BMPER KO and overexpression in hypoxia-induced PH mice, LRP1 co-depletion epistasis, YAP activation assays","pmids":["40964716"],"confidence":"High","gaps":["Whether pharmacological BMPER neutralization can reverse established PH is unknown","The BMPER–LRP1 binding stoichiometry and structural interface remain unresolved"]},{"year":null,"claim":"Key unresolved questions include the identity of the protease that cleaves BMPER intracellularly, the atomic structure of BMPER alone and in complex with BMP ligands/Tsg/LRP1, the mechanisms governing tissue-specific activator-versus-inhibitor output, and whether BMPER–LRP1–YAP signaling operates in vascular beds beyond the pulmonary circulation.","evidence":"","pmids":[],"confidence":"Low","gaps":["No protease identified for BMPER cleavage","No crystal or cryo-EM structure available","Tissue-specific concentration thresholds for activator/inhibitor switch are not quantitatively defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2,4,6,9,17,19]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[19]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,6,19]},{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[1,19]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[19]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,4,6,9,15,17,18,26]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,4,9,17,18]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,7,15]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[6,27]}],"complexes":[],"partners":["BMP2","BMP4","BMP6","TSG","LRP1","IGFBP4"],"other_free_text":[]},"mechanistic_narrative":"BMPER is a secreted extracellular glycoprotein that functions as a concentration-dependent modulator of BMP signaling: at low molar ratios relative to BMPs it acts as a co-activator facilitating Smad1/5 phosphorylation and Erk activation, while at high ratios it switches to an inhibitor that routes BMP ligands to lysosomal degradation via an endocytic trap-and-sink mechanism [PMID:12897139, PMID:18787191, PMID:19221194]. BMPER directly binds BMP2, BMP4, and BMP6, cooperates with Twisted gastrulation (Tsg) in modulating BMP output, is tethered to the cell surface through C-terminal heparan sulfate proteoglycan interactions, and undergoes intracellular cleavage to release a diffusible N-terminal fragment that potently inhibits BMP-4 signaling [PMID:19914233, PMID:30125619]. Beyond canonical BMP–Smad modulation, BMPER signals through the receptor LRP1 to activate NFATc1, regulate Erk, and control YAP nuclear entry in smooth muscle cells, linking it to vascular inflammation, endothelial barrier integrity via VE-cadherin, arteriovenous specification through BMP–Notch crosstalk, and pulmonary arterial hypertension [PMID:28596374, PMID:27995357, PMID:29473997, PMID:40964716]. BMPER is essential for vascular development, hematopoietic stem cell maturation, coronary plexus remodeling, cardiac cushion EMT, hepcidin regulation, and smooth muscle contractile phenotype maintenance, and its expression is transcriptionally activated by KLF15 and KLF2 and post-transcriptionally stabilized through the RhoA/ROCK pathway and m5C methylation [PMID:19767294, PMID:39196179, PMID:20042706, PMID:40589169]."},"prefetch_data":{"uniprot":{"accession":"Q8N8U9","full_name":"BMP-binding endothelial regulator protein","aliases":["Bone morphogenetic protein-binding endothelial cell precursor-derived regulator","Protein crossveinless-2","hCV2"],"length_aa":685,"mass_kda":76.0,"function":"Inhibitor of bone morphogenetic protein (BMP) function, it may regulate BMP responsiveness of osteoblasts and chondrocytes","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/Q8N8U9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BMPER","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/BMPER","total_profiled":1310},"omim":[{"mim_id":"610655","title":"TELANGIECTASIA, HEREDITARY HEMORRHAGIC, TYPE 4; HHT4","url":"https://www.omim.org/entry/610655"},{"mim_id":"608699","title":"BONE MORPHOGENETIC PROTEIN-BINDING ENDOTHELIAL REGULATOR PROTEIN; BMPER","url":"https://www.omim.org/entry/608699"},{"mim_id":"608022","title":"DIAPHANOSPONDYLODYSOSTOSIS","url":"https://www.omim.org/entry/608022"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/BMPER"},"hgnc":{"alias_symbol":["Cv2","CRIM3"],"prev_symbol":[]},"alphafold":{"accession":"Q8N8U9","domains":[{"cath_id":"-","chopping":"48-83","consensus_level":"medium","plddt":85.4161,"start":48,"end":83},{"cath_id":"-","chopping":"107-269","consensus_level":"medium","plddt":87.3911,"start":107,"end":269},{"cath_id":"-","chopping":"357-533","consensus_level":"high","plddt":88.4028,"start":357,"end":533},{"cath_id":"2.10.25","chopping":"633-680","consensus_level":"high","plddt":76.3133,"start":633,"end":680},{"cath_id":"2.10.70","chopping":"300-332","consensus_level":"high","plddt":79.4703,"start":300,"end":332},{"cath_id":"1.10.8","chopping":"549-611","consensus_level":"high","plddt":89.0024,"start":549,"end":611}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N8U9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N8U9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N8U9-F1-predicted_aligned_error_v6.png","plddt_mean":79.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BMPER","jax_strain_url":"https://www.jax.org/strain/search?query=BMPER"},"sequence":{"accession":"Q8N8U9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N8U9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N8U9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N8U9"}},"corpus_meta":[{"pmid":"12897139","id":"PMC_12897139","title":"BMPER, 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It contains an amino-terminal signal peptide, five cysteine-rich domains, a von Willebrand D domain, and a trypsin inhibitor domain.\",\n      \"method\": \"Direct protein binding assays, Smad5 activation assays, Xenopus ventral injection axis duplication assay, embryoid body differentiation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (binding assay, signaling readout, in vivo Xenopus model, embryoid body assay) in foundational paper\",\n      \"pmids\": [\"12897139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"BMPER is an extracellular matrix protein expressed by endothelial cells and acts as a downstream target of FoxO3a. It promotes endothelial cell sprouting and migration and is necessary for BMP4-induced Smad1/5 phosphorylation and Erk1/2 activation. BMP4 and BMPER are mutually required for their respective activities.\",\n      \"method\": \"Western blotting, immunocytochemistry, siRNA knockdown, in vitro sprouting/migration assays, in vivo zebrafish model, Smad1/5 phosphorylation assay\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD phenotype, signaling assay, in vivo) with strong mechanistic follow-up\",\n      \"pmids\": [\"18787191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"At molar concentrations exceeding BMP4, BMPER switches from a BMP activator to an inhibitor via a novel endocytic trap-and-sink mechanism, leading to lysosomal degradation of both BMPER and BMP4, reducing the duration and magnitude of BMP4-dependent Smad signaling. Noggin and Gremlin, but not Chordin, trigger similar BMP endocytosis.\",\n      \"method\": \"Dose-response signaling assays, endocytosis tracking, lysosomal inhibition experiments, Smad reporter assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mechanistic endocytic pathway established with multiple orthogonal approaches including pharmacological inhibition and dose-dependent signaling readouts\",\n      \"pmids\": [\"19221194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Zebrafish BMPER ortholog (zbmper) is expressed at sites of BMP activity including vascular precursor cells. Knockdown of zbmper results in a dorsalized phenotype, reduced hematopoietic precursors, and vascular patterning defects, establishing a conserved role in vascular and hematopoietic development.\",\n      \"method\": \"Morpholino knockdown in zebrafish, in situ hybridization, gata1 marker analysis\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with defined cellular phenotype, replicated across zebrafish and mouse models\",\n      \"pmids\": [\"17618647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cv2 (mouse BMPER ortholog) acts as a pro-BMP factor in nephron precursor development through Twisted gastrulation (Tsg). Cv2-null mice show reduced cap condensates and lower pSmad1 levels. The renal defects of Cv2-/- are fully suppressed by Tsg null mutation, placing Cv2 upstream of Tsg in the BMP signaling hierarchy for nephrogenesis.\",\n      \"method\": \"Genetic epistasis (double knockout), immunostaining for pSmad1, embryonic kidney cell line assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic epistasis with double mutant rescue, multiple orthogonal in vivo and in vitro methods\",\n      \"pmids\": [\"19914233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BMPER modulates vascular inflammation by suppressing TNFα-NFκB signaling. BMPER is downregulated by the TNFα-NFκB-KLF2 pathway. Loss of BMPER (siRNA or BMPER+/- mice) induces proinflammatory endothelial phenotype with reduced eNOS and enhanced adhesion molecule expression, increased leukocyte adhesion. The anti-inflammatory effects of BMPER are dependent on BMP signaling through NFκB.\",\n      \"method\": \"siRNA knockdown, BMPER+/- mouse model, intravital microscopy, ex vivo and in vivo leukocyte adhesion assays, eNOS/adhesion molecule expression\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and in vitro loss-of-function with mechanistic pathway placement via NFκB\",\n      \"pmids\": [\"21900199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BMPER is a negative regulator of hepcidin. Soluble BMPER peptide inhibits BMP2- and BMP6-dependent hepcidin promoter activity and reduces pSMAD1/5/8 levels in hepatocytes. Injection of BMPER peptide into mice reduces liver hepcidin and increases serum iron levels.\",\n      \"method\": \"Hepcidin promoter reporter assays in HepG2 and HuH7 cells, primary human hepatocyte treatment, in vivo BMPER peptide injection with iron and hepcidin measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo mechanistic studies with defined pathway (BMP/SMAD/hepcidin)\",\n      \"pmids\": [\"22144676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Bmper haploinsufficiency in ApoE-/- mice leads to increased atherosclerosis with elevated BMP activity in endothelial cells. siRNA knockdown of Bmper in HUVECs dramatically increases ICAM-1 and VCAM-1 expression at rest and under shear stress, identifying Bmper as a critical regulator of BMP-mediated vascular inflammation.\",\n      \"method\": \"ApoE-/-/Bmper+/- mouse model, siRNA knockdown, ICAM-1/VCAM-1 expression, atherosclerotic plaque quantification, shear stress experiments\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model plus in vitro mechanistic KD with defined inflammatory readouts\",\n      \"pmids\": [\"22772758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"BMPER promotes osteoblast-like differentiation of human coronary artery smooth muscle cells (HCASMCs) by antagonizing BMP-2-induced Smad1/5/8 phosphorylation and by increasing IκBα phosphorylation and NF-κB activity. NF-κB decoy oligonucleotides impair BMPER-induced osteoblast-like differentiation.\",\n      \"method\": \"RNA interference, recombinant BMPER treatment, Smad1/5/8 phosphorylation assay, NF-κB reporter, alkaline phosphatase and mineralization assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple signaling pathway assays with functional readout (osteoblast differentiation markers)\",\n      \"pmids\": [\"22778264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BMPER-regulated BMP signaling is critical for coronary plexus remodeling. BMPER-/- embryos show atretic coronary arteries or distal connections. BMPER directly binds BMP2 and blocks BMP2-induced Smad activation in a dose-dependent manner. BMPER inhibits BMP2-induced Sox9 increase during endocardial cushion EMT.\",\n      \"method\": \"BMPER-/- mouse embryo analysis, in vitro tubulogenesis, migration assay, pulldown/binding assay, Smad activation quantification, Sox9 immunostaining\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined developmental phenotype plus in vitro mechanistic binding and signaling assays\",\n      \"pmids\": [\"24373957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BMPER and Tsg cooperate in BMP pathway modulation to control endothelial cell angiogenesis. Both proteins show concentration-dependent proangiogenic activity via Akt, Erk, and Smad signaling. BMPER and Tsg interfere with each other to enhance proangiogenic events; in vivo, both are required for normal zebrafish vascular development.\",\n      \"method\": \"Matrigel assay, HUVEC sprouting/migration/proliferation, siRNA knockdown, Akt/Erk/Smad signaling assays, zebrafish morpholino knockdown\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo approaches with defined signaling pathway measurements\",\n      \"pmids\": [\"23641068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"BMPER promotes angiogenesis in endothelial cells by upregulating bFGF/FGF-2 expression and FGF receptor-1 expression and phosphorylation, and downregulating thrombospondin-1. The proangiogenic effect of BMPER is blocked by an anti-bFGF antibody. In Bmper+/- mice, aortic ring assays confirm a specific effect for bFGF but not VEGF.\",\n      \"method\": \"Angiogenesis antibody array, siRNA knockdown, anti-bFGF neutralizing antibody, Matrigel/spheroid/migration assays, in vivo Matrigel plug assay, aortic ring assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo methods with pathway-specific blocking experiments\",\n      \"pmids\": [\"25503991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"KLF15 directly activates BMPER expression by binding to a KLF-binding element at -284 bp within the BMPER promoter. Sp1 antagonizes KLF15-induced BMPER promoter activation. Endothelin-1 downregulates BMPER expression via the ETB receptor by suppressing KLF15.\",\n      \"method\": \"BMPER promoter deletion analysis, gelshift/EMSA assays, KLF15 overexpression and siRNA knockdown, promoter reporter assays, ET-receptor antagonist (BQ788)\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct DNA binding confirmed by EMSA, promoter reporters, and pharmacological pathway dissection\",\n      \"pmids\": [\"19767294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Statins upregulate BMPER expression in endothelial cells mainly through a posttranscriptional mechanism (prolonged RNA half-life) via the RhoA/ROCK/actin pathway. BMPER upregulation by mevastatin is prevented by RhoA activators and enhanced by RhoA/ROCK/actin inhibitors. Increasing BMPER concentrations downregulate ICAM-1 expression and have anti-inflammatory effects.\",\n      \"method\": \"Actinomycin D chase analysis, BMPER promoter reporter assays, RhoA pathway activators/inhibitors (C3-toxin, RhoAN19, fasudil, cytochalasin D), RT-PCR, Western blotting, ICAM-1 expression assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mechanism of RNA stabilization determined with multiple pharmacological tools and reporters\",\n      \"pmids\": [\"20042706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BMPER is a novel positive regulator of HSC maturation in the AGM region. BMPER is associated with BMP signaling inhibition but is transcriptionally induced by BMP4, suggesting BMPER contributes to the precise control of BMP activity enabling HSC maturation in a BMP-negative environment.\",\n      \"method\": \"RNA sequencing of AGM spatiotemporal transitions, ex vivo reaggregate culture system, BMP4 stimulation, HSC maturation assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — ex vivo functional assay with signaling context, single lab\",\n      \"pmids\": [\"29093060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BMPER activates nuclear factor of activated T cells c1 (NFATc1) in endothelial cells through multiple BMP-independent signaling pathways: LRP1-ERK activation, calcineurin signaling, and LRP1β-mediated NF45 nuclear export. BMPER-induced NFATc1 activation is required for lipopolysaccharide-induced vascular inflammation.\",\n      \"method\": \"BMPER+/- mouse LPS challenge, survival assay, cytokine measurement, NFATc1 reporter assays, LRP1 interaction studies, calcineurin inhibition, NF45 nuclear export assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple signaling pathways dissected in vitro and in vivo with functional endpoint\",\n      \"pmids\": [\"28596374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BMPER regulates endothelial barrier function by maintaining VE-cadherin expression. BMPER knockdown reduces VE-cadherin and impairs endothelial barrier through enhanced BMP4-Smad-Id1 signaling. High levels of BMPER antagonize BMP4-Smad5-Id1 signaling and prevent VE-cadherin downregulation and endothelial leakage in vivo.\",\n      \"method\": \"BMPER+/- mouse Evans blue dye leakage, siRNA knockdown, FITC-dextran transwell permeability assay, VE-cadherin expression analysis, Smad-Id1 signaling assay\",\n      \"journal\": \"Inflammation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and in vitro mechanistic studies with defined pathway (BMP4-Smad-Id1-VE-cadherin)\",\n      \"pmids\": [\"27995357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BMPER promotes epithelial-mesenchymal transition (EMT) during cardiac cushion development by modulating BMP2-induced Smad and Sox9 activity. BMPER directly binds BMP2 and dose-dependently blocks BMP2-induced Smad activation. In BMPER-/- embryos, canonical BMP pathway is more active in AV cushions during EMT, resulting in increased Sox9-positive cells.\",\n      \"method\": \"BMPER-/- embryo histology, direct BMP2 binding assay, Smad activation quantification, Sox9 immunostaining, in vitro endothelial cell BMP2/BMPER co-treatment\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic KO with mechanistic in vitro binding and signaling validation\",\n      \"pmids\": [\"26418455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BMPER and TWSG1 activate arteriovenous specification in zebrafish endothelial cells by stimulating Notch signaling targets (HEY1/2, EPHRINB2). Silencing of bmper and twsg1b in zebrafish results in enhanced venous marker expression and dysregulated arterial marker expression. BMP receptor antagonist DMH1 abolishes BMPER and BMP4-induced Notch signaling.\",\n      \"method\": \"Zebrafish morpholino knockdown, in situ hybridization for arteriovenous markers, qRT-PCR, Western blot for Notch targets, DMH1 BMP receptor antagonism\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and in vitro mechanistic dissection of BMP-Notch pathway crosstalk\",\n      \"pmids\": [\"29473997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BMPER binds Tsg through its N-terminal BMP-binding region; this N-terminal fragment alone inhibits BMP-4 signaling more potently than full-length BMPER. BMPER and Tsg cooperatively inhibit BMP-4 signaling. Full-length BMPER is targeted to the plasma membrane via C-terminal heparan sulphate proteoglycan binding, while an active cleavage fragment is diffusible. A disease-causing P370L mutation prevents intracellular cleavage.\",\n      \"method\": \"Pulldown/binding assay, BMP-4 signaling reporter assays, SAXS and electron microscopy structural analysis, heparan sulphate proteoglycan binding assay, P370L mutant analysis, intracellular cleavage assay\",\n      \"journal\": \"Matrix biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural analysis (SAXS/EM), in vitro binding, mutagenesis, and signaling assays in one study\",\n      \"pmids\": [\"30125619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BMPER promotes tumor growth and angiogenesis in lung carcinoma cells; its loss impairs proliferation, migration, invasion, and tumor cell-induced endothelial sprout formation. BMPER effects are transduced via regulation of Id1 (BMP target transcription factor) and MMP-9 and MMP-2.\",\n      \"method\": \"siRNA knockdown in A549 cells, proliferation/migration/invasion assays, in vivo Lewis lung carcinoma mouse model, Id1 and MMP expression analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and in vitro KD with defined molecular pathway, single lab\",\n      \"pmids\": [\"22020334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BMPER alleviates ischemic brain injury by activating the Smad3/Akt/Nrf2 pathway in neurons. BMPER administration reduces infarct size, brain edema, neuroinflammation, and cell death after MCAO. In OGD/R-challenged neurons, BMPER activates Smad3/Akt/Nrf2 signaling.\",\n      \"method\": \"MCAO mouse model, primary neuron OGD/R in vitro model, Western blotting for Smad3/Akt/Nrf2, immunohistochemistry, infarct measurement\",\n      \"journal\": \"CNS neuroscience & therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — in vivo and in vitro with pathway analysis, single lab\",\n      \"pmids\": [\"34904361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BMPER inhibits TGF-β1-induced tubular dedifferentiation and fibroblast activation. Exogenous BMPER inhibits Id-1 upregulation, prevents E-cadherin loss, and suppresses fibroblast activation by inhibiting Erk1/2 phosphorylation. This Erk1/2 inhibition is abolished by LRP1 knockdown, identifying LRP1 as the BMPER receptor mediating this effect.\",\n      \"method\": \"siRNA knockdown, exogenous BMPER treatment, Erk1/2 phosphorylation assay, LRP1 knockdown, UUO mouse model with BMPER gene delivery\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor identification via knockdown epistasis, in vivo and in vitro, single lab\",\n      \"pmids\": [\"33644047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"High fluid shear stress (FSS) suppresses Smad1/5 by elevating KLF2, which induces BMPER, thereby de-inhibiting Akt to facilitate outward vascular remodeling. Endothelial BMPER deletion impairs blood flow recovery and vascular remodeling in mice. This establishes the KLF2-BMPER-Smad1/5 axis as a mechanosensitive checkpoint.\",\n      \"method\": \"Surgical high FSS mouse model, endothelial-specific BMPER deletion, KLF2/BMPER/Smad1/5/Akt pathway analysis, diabetic mouse models with BMP9/10 blocking antibodies\",\n      \"journal\": \"Nature cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo endothelial KO with defined mechanosensitive signaling pathway, multiple disease models\",\n      \"pmids\": [\"39196179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BMPER is required for adipogenesis in 3T3-L1 preadipocytes and mouse adipose progenitor cells; BMPER expression and release peak at day 4 post-differentiation. BMPER is a conserved marker of adipose progenitor cells and adipocytes in visceral adipose tissue.\",\n      \"method\": \"siRNA knockdown in 3T3-L1 preadipocytes, mouse APC differentiation assays, lentiviral KD, single-cell/single-nucleus RNA-seq\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — loss-of-function with defined cellular phenotype, but mechanistic pathway not fully delineated\",\n      \"pmids\": [\"37311809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BMPER stimulation of vascular smooth muscle cells (vSMCs) promotes a contractile phenotype; BMPER silencing increases proliferation, migration, and reduces contractibility. BMPER binds IGFBP4, modulating IGF signaling. Perivascular BMPER application prevents neointima formation in a mouse carotid ligation model.\",\n      \"method\": \"siRNA knockdown and recombinant BMPER treatment of primary vSMCs, Bmper+/- mouse carotid ligation model, IGFBP4 binding assay, contractility/proliferation/migration assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — binding partner identified, in vivo and in vitro phenotypic data, single lab\",\n      \"pmids\": [\"36902380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Endothelial BMPER promotes pulmonary arterial hypertension by activating YAP in pulmonary artery smooth muscle cells through releasing YAP from sequestration by LRP1 at the cell membrane. Endothelial-specific BMPER overexpression causes spontaneous PH; BMPER depletion attenuates pulmonary vascular remodeling via LRP1-YAP mechanism.\",\n      \"method\": \"Global and endothelial cell-specific BMPER knockout mice, AAV-assisted BMPER overexpression, hypoxia-induced PH model, LRP1 co-depletion epistasis, YAP activation assays, right ventricular pressure measurement\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (double depletion), gain and loss of function in vivo, defined LRP1-YAP mechanism\",\n      \"pmids\": [\"40964716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SUGP2 knockdown causes abnormal alternative splicing of CIRBP pre-mRNA, increasing CIRBP V1, which increases BMPER mRNA stability and translation. Elevated BMPER then downregulates pSMAD1/5 and hepcidin (HAMP), establishing a SUGP2/CIRBP/BMPER/SMAD/hepcidin axis in hemochromatosis.\",\n      \"method\": \"RNA-seq, RNA-protein pull-down, RNA immunoprecipitation, SUGP2 p.Arg622Gln CRISPR knock-in mice, Western blot for pSMAD1/5 and hepcidin, BMPER mRNA stability assay\",\n      \"journal\": \"American journal of hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple molecular methods in one study establishing upstream regulatory pathway, single lab\",\n      \"pmids\": [\"38800953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NSUN6 stabilizes BMPER expression in an m5C-dependent manner in hepatocellular carcinoma. BMPER knockdown reverses the tumor-suppressive effects of NSUN6 overexpression, establishing NSUN6 as an upstream regulator of BMPER through mRNA methylation-dependent stability.\",\n      \"method\": \"MeRIP-seq, actinomycin-D mRNA stability assay, luciferase reporter, NSUN6 overexpression in HCC cells and PDX mouse model, BMPER rescue experiment\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic epistasis confirmed by rescue, mRNA stability assay, and in vivo model, single lab\",\n      \"pmids\": [\"40589169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BMPER expression in lung fibroblasts is regulated by DNA methylation; demethylation with 5'-azacytidine decreases BMPER expression and attenuates fibroblast invasion/migration. siRNA-mediated BMPER reduction impairs fibroblast migration and invasion in IPF fibroblasts.\",\n      \"method\": \"5'-azacytidine demethylation treatment, siRNA knockdown, invasion/migration assays, in vivo mouse fibrosis model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — epigenetic regulatory mechanism and loss-of-function phenotype established, single lab\",\n      \"pmids\": [\"26442443\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BMPER is a secreted extracellular BMP-binding glycoprotein that acts as a concentration-dependent, context-dependent modulator of BMP signaling: at low concentrations it acts as a BMP co-activator (facilitating Smad1/5 phosphorylation and Erk activation), while at high concentrations it sequesters BMPs via an endocytic trap-and-sink mechanism for lysosomal degradation; it directly binds BMP2, BMP4, and BMP6, interacts with co-modulators Tsg and IGFBP4, is targeted to the cell surface via heparan sulphate proteoglycans, undergoes intracellular cleavage to generate a diffusible active N-terminal fragment, signals through LRP1 to activate NFATc1 and regulate Erk and YAP, is transcriptionally regulated by KLF15 (activated) and endothelin-1/RhoA/ROCK (suppressed), and plays essential roles in vascular development, angiogenesis, arteriovenous specification (via BMP-Notch crosstalk), endothelial barrier integrity (via VE-cadherin), hematopoietic stem cell maturation, hepcidin regulation, cardiac valve EMT, and smooth muscle cell phenotype maintenance.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"BMPER is a secreted extracellular glycoprotein that functions as a concentration-dependent modulator of BMP signaling: at low molar ratios relative to BMPs it acts as a co-activator facilitating Smad1/5 phosphorylation and Erk activation, while at high ratios it switches to an inhibitor that routes BMP ligands to lysosomal degradation via an endocytic trap-and-sink mechanism [PMID:12897139, PMID:18787191, PMID:19221194]. BMPER directly binds BMP2, BMP4, and BMP6, cooperates with Twisted gastrulation (Tsg) in modulating BMP output, is tethered to the cell surface through C-terminal heparan sulfate proteoglycan interactions, and undergoes intracellular cleavage to release a diffusible N-terminal fragment that potently inhibits BMP-4 signaling [PMID:19914233, PMID:30125619]. Beyond canonical BMP–Smad modulation, BMPER signals through the receptor LRP1 to activate NFATc1, regulate Erk, and control YAP nuclear entry in smooth muscle cells, linking it to vascular inflammation, endothelial barrier integrity via VE-cadherin, arteriovenous specification through BMP–Notch crosstalk, and pulmonary arterial hypertension [PMID:28596374, PMID:27995357, PMID:29473997, PMID:40964716]. BMPER is essential for vascular development, hematopoietic stem cell maturation, coronary plexus remodeling, cardiac cushion EMT, hepcidin regulation, and smooth muscle contractile phenotype maintenance, and its expression is transcriptionally activated by KLF15 and KLF2 and post-transcriptionally stabilized through the RhoA/ROCK pathway and m5C methylation [PMID:19767294, PMID:39196179, PMID:20042706, PMID:40589169].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of BMPER as a secreted BMP-binding protein that antagonizes BMP4-dependent Smad5 activation established the gene as a new extracellular BMP modulator distinct from known antagonists like Noggin and Chordin.\",\n      \"evidence\": \"Direct binding assays, Smad5 activation assays, Xenopus axis duplication, and embryoid body differentiation\",\n      \"pmids\": [\"12897139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BMPER could also function as a BMP activator was not tested\", \"The receptor through which BMPER signals was unknown\", \"In vivo mammalian loss-of-function data were lacking\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Zebrafish loss-of-function revealed that BMPER is required in vivo for vascular patterning and hematopoietic precursor specification, extending its role from a biochemical antagonist to a developmental regulator of vasculogenesis and hematopoiesis.\",\n      \"evidence\": \"Morpholino knockdown in zebrafish with vascular and hematopoietic marker analysis\",\n      \"pmids\": [\"17618647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BMPER has a pro-BMP or anti-BMP net effect in vivo was unresolved\", \"Mammalian genetic confirmation was pending\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The paradoxical discovery that BMPER is required for BMP4-induced Smad1/5 phosphorylation and promotes endothelial sprouting overturned the simple antagonist model and established BMPER as a bipotential modulator of BMP signaling.\",\n      \"evidence\": \"siRNA knockdown in endothelial cells with Smad1/5 phosphorylation, Erk1/2 activation, sprouting/migration assays, and zebrafish validation\",\n      \"pmids\": [\"18787191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The mechanism underlying the switch from activator to inhibitor was unknown\", \"Whether dose was the determining variable was untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Three concurrent advances resolved the activator/inhibitor paradox, defined transcriptional control, and uncovered post-transcriptional regulation: BMPER switches from activator to inhibitor at high molar ratios via endocytic routing of BMP4 to lysosomes; KLF15 directly activates BMPER transcription while endothelin-1 suppresses it; and statins stabilize BMPER mRNA through RhoA/ROCK inhibition.\",\n      \"evidence\": \"Dose-response signaling with lysosomal inhibition (trap-and-sink); EMSA/promoter reporter for KLF15 binding; actinomycin-D chase with RhoA pathway pharmacology\",\n      \"pmids\": [\"19221194\", \"19767294\", \"20042706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The endocytic receptor mediating BMPER–BMP internalization was unidentified\", \"Whether the cleavage products of BMPER have distinct activities was unknown\", \"Genetic epistasis with known BMP modulators in mammals was lacking\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Genetic epistasis in Cv2 (BMPER) and Tsg double-knockout mice demonstrated that BMPER acts as a pro-BMP factor upstream of Tsg during nephrogenesis, providing the first mammalian genetic evidence for tissue-specific BMP co-activation.\",\n      \"evidence\": \"Cv2-null and Cv2/Tsg double-null mouse kidney phenotyping with pSmad1 immunostaining\",\n      \"pmids\": [\"19914233\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the Cv2–Tsg epistasis applies to vascular contexts was untested\", \"The biochemical mechanism of BMPER–Tsg cooperation remained unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"BMPER was linked to vascular inflammation and iron homeostasis: loss of BMPER de-represses TNFα-NF-κB signaling and adhesion molecule expression in endothelium, while soluble BMPER inhibits BMP-dependent hepcidin expression and raises serum iron in vivo.\",\n      \"evidence\": \"BMPER+/- mice with intravital leukocyte adhesion; BMPER peptide injection with hepatic hepcidin and iron measurement; siRNA in HUVECs and hepatocytes\",\n      \"pmids\": [\"21900199\", \"22144676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The receptor for BMPER's anti-inflammatory effect was unidentified\", \"Whether BMPER directly signals in hepatocytes or acts only as a BMP sink was unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"BMPER was shown to promote osteoblast-like differentiation of coronary smooth muscle cells via NF-κB activation, and Bmper haploinsufficiency in ApoE-null mice increased atherosclerotic burden, linking BMPER to vascular calcification and disease.\",\n      \"evidence\": \"ApoE−/−/Bmper+/− atherosclerosis quantification; NF-κB decoy oligonucleotides blocking BMPER-induced SMC osteogenic differentiation\",\n      \"pmids\": [\"22772758\", \"22778264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BMPER's pro-osteogenic and anti-inflammatory roles represent cell-type-specific effects was untested\", \"The surface receptor mediating BMPER effects on SMCs was unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"BMPER-null embryos displayed atretic coronary arteries and dysregulated endocardial cushion EMT with excessive Sox9 expression, establishing BMPER as essential for coronary remodeling and cardiac valve morphogenesis through dose-dependent BMP2 antagonism.\",\n      \"evidence\": \"BMPER−/− mouse embryo coronary and cushion phenotyping, BMP2 binding and Smad activation dose-response assays\",\n      \"pmids\": [\"24373957\", \"23641068\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The relationship between the coronary and cushion phenotypes was unclear\", \"Whether the embryonic lethality was primarily vascular or cardiac was not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"BMPER was found to promote angiogenesis by upregulating bFGF/FGFR-1 and downregulating thrombospondin-1, and to regulate cardiac cushion EMT through BMP2-Smad-Sox9, establishing cross-pathway effector mechanisms beyond BMP–Smad alone.\",\n      \"evidence\": \"Anti-bFGF neutralizing antibody blocking BMPER angiogenesis; BMPER−/− AV cushion Sox9 quantification; aortic ring assays in Bmper+/− mice\",\n      \"pmids\": [\"25503991\", \"26418455\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How BMPER activates bFGF transcription was not determined\", \"Whether bFGF induction depends on BMP signaling or is a BMP-independent BMPER function was unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The discovery that BMPER signals through LRP1 to activate NFATc1 via ERK and calcineurin pathways, independently of canonical BMP receptors, identified the first BMP-independent receptor-mediated signaling axis for BMPER and linked it to sepsis-related vascular inflammation.\",\n      \"evidence\": \"BMPER+/− mouse LPS challenge, LRP1 interaction studies, NFATc1 reporter assays, calcineurin inhibition\",\n      \"pmids\": [\"28596374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The BMPER–LRP1 binding interface was uncharacterized\", \"Whether LRP1 mediates the endocytic trap-and-sink mechanism was untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"BMPER was shown to maintain endothelial barrier integrity by sustaining VE-cadherin expression through inhibition of BMP4-Smad5-Id1 signaling, and to promote hematopoietic stem cell maturation in the AGM region, broadening its functional repertoire.\",\n      \"evidence\": \"BMPER+/− Evans blue permeability, siRNA VE-cadherin/Id1 assays; AGM reaggregate HSC maturation culture\",\n      \"pmids\": [\"27995357\", \"29093060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether barrier function and HSC maturation share the same BMPER concentration threshold was unknown\", \"In vivo HSC-specific BMPER deletion data were lacking\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Structural and biochemical analysis revealed that BMPER's N-terminal fragment is generated by intracellular cleavage, binds both BMP-4 and Tsg, and is more potent than full-length BMPER, while the full-length protein is tethered at the cell surface via C-terminal heparan sulfate proteoglycan binding; additionally, BMPER and TWSG1 cooperate to activate Notch signaling for arteriovenous specification.\",\n      \"evidence\": \"SAXS/EM structural analysis, cleavage/binding assays, P370L disease mutant analysis; zebrafish morpholino with Notch target readouts, DMH1 BMP receptor antagonist\",\n      \"pmids\": [\"30125619\", \"29473997\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The protease responsible for BMPER cleavage was not identified\", \"Whether the P370L mutation causes disease solely through cleavage deficiency was unresolved\", \"Crystal structure of BMPER–BMP or BMPER–Tsg complex was lacking\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"BMPER was found to bind IGFBP4 and maintain the contractile phenotype of vascular smooth muscle cells, preventing neointima formation, and separately shown to be required for adipocyte differentiation, extending its roles to IGF signaling modulation and metabolic biology.\",\n      \"evidence\": \"IGFBP4 binding assay, Bmper+/− carotid ligation model; siRNA in 3T3-L1 and mouse adipose progenitor cells with scRNA-seq\",\n      \"pmids\": [\"36902380\", \"37311809\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The structural basis for BMPER–IGFBP4 interaction is unknown\", \"Whether BMPER's adipogenic role is BMP-dependent or BMP-independent was not determined\", \"Independent replication of the IGFBP4 interaction is needed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A mechanosensitive KLF2–BMPER–Smad1/5–Akt axis was identified as a checkpoint for outward vascular remodeling under high fluid shear stress, using endothelial-specific BMPER deletion, and separately BMPER was placed in the SUGP2/CIRBP/BMPER/SMAD/hepcidin iron regulatory pathway.\",\n      \"evidence\": \"Endothelial-specific BMPER KO in high-FSS mouse model; SUGP2 CRISPR knock-in mice with BMPER mRNA stability and pSMAD1/5 analysis\",\n      \"pmids\": [\"39196179\", \"38800953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the KLF2–BMPER axis operates in human arteriogenesis is untested\", \"The relative contribution of BMPER versus other BMP antagonists to hepcidin regulation in vivo is unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Endothelial BMPER was shown to promote pulmonary arterial hypertension by releasing YAP from LRP1-mediated sequestration at the smooth muscle cell membrane, establishing a paracrine BMPER–LRP1–YAP axis in pulmonary vascular remodeling.\",\n      \"evidence\": \"Endothelial-specific BMPER KO and overexpression in hypoxia-induced PH mice, LRP1 co-depletion epistasis, YAP activation assays\",\n      \"pmids\": [\"40964716\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether pharmacological BMPER neutralization can reverse established PH is unknown\", \"The BMPER–LRP1 binding stoichiometry and structural interface remain unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the identity of the protease that cleaves BMPER intracellularly, the atomic structure of BMPER alone and in complex with BMP ligands/Tsg/LRP1, the mechanisms governing tissue-specific activator-versus-inhibitor output, and whether BMPER–LRP1–YAP signaling operates in vascular beds beyond the pulmonary circulation.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No protease identified for BMPER cleavage\", \"No crystal or cryo-EM structure available\", \"Tissue-specific concentration thresholds for activator/inhibitor switch are not quantitatively defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2, 4, 6, 9, 17, 19]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 6, 19]},\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [1, 19]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 4, 6, 9, 15, 17, 18, 26]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 4, 9, 17, 18]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 7, 15]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [6, 27]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BMP2\", \"BMP4\", \"BMP6\", \"TSG\", \"LRP1\", \"IGFBP4\"],\n    \"other_free_text\": []\n  }\n}\n```"}