{"gene":"WNT7B","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2005,"finding":"WNT7B activates canonical Wnt signaling (but not non-canonical Wnt pathway) in a cell-specific manner by binding directly to Frizzled-1 (Fzd1) and Frizzled-10 (Fzd10) on the cell surface, and cooperatively activates canonical Wnt signaling with these receptors in the presence of LRP5 co-receptor.","method":"Cell transfection assays, biochemical binding studies (cell-surface binding), canonical vs. non-canonical Wnt pathway reporter assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — direct biochemical binding assay plus functional reporter assays demonstrating receptor specificity with multiple cell lines","pmids":["15923619"],"is_preprint":false},{"year":2005,"finding":"Macrophage-derived WNT7B is a short-range paracrine signal that activates the canonical WNT pathway in adjacent vascular endothelial cells of the hyaloid vessels, initiating programmed cell death (apoptosis) in those target cells during eye development.","method":"Genetic mouse model (macrophage-specific Wnt7b expression), in vivo analysis of WNT-pathway responses and apoptosis in hyaloid vessel endothelial cells","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — clean genetic loss-of-function in mice with defined cellular phenotype (apoptosis of hyaloid endothelial cells), replicated with pathway reporter analysis; highly cited foundational paper","pmids":["16163358"],"is_preprint":false},{"year":2002,"finding":"Wnt7b expressed in the airway epithelium is required for mesenchymal proliferation and vascular smooth muscle development in the lung; loss of Wnt7b causes lung hypoplasia and defects in smooth muscle of major pulmonary vessels.","method":"Germline mouse knockout (lacZ replacement of first exon), histology and phenotypic analysis of Wnt7b-null mice","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — clean germline KO with well-defined perinatal lethal phenotype and distinct cellular defects in lung mesenchyme and vascular smooth muscle","pmids":["12361974"],"is_preprint":false},{"year":2001,"finding":"Wnt7b expression in the chorion is required for chorioallantoic fusion during placental development; loss of Wnt7b leads to failure of chorion-allantois fusion, loss of alpha4 integrin expression in chorion cells, and midgestation lethality.","method":"Targeted germline mouse mutation (gene knockout), immunostaining for alpha4 integrin, phenotypic analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined midgestation lethal phenotype and identified downstream molecular change (loss of alpha4 integrin)","pmids":["11543617"],"is_preprint":false},{"year":2009,"finding":"Wnt7b, expressed by the collecting duct epithelium, regulates the orientation of epithelial cell division planes to establish the cortico-medullary axis of the kidney; in Wnt7b mutants, cell divisions are biased radially instead of longitudinally. Wnt7b acts paracrinally through the canonical Wnt/beta-catenin pathway in the surrounding interstitium, as shown by the fact that removal of beta-catenin from Wnt-responsive interstitium phenocopies the Wnt7b mutant medullary deficiency.","method":"Conditional mouse knockout, division plane analysis, genetic epistasis (beta-catenin conditional KO in interstitium phenocopying Wnt7b KO)","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal approaches including epistasis, cell division analysis, and pathway reporter studies in a single study","pmids":["19060336"],"is_preprint":false},{"year":2010,"finding":"Macrophage-derived Wnt7b stimulates canonical Wnt pathway responses in kidney epithelial cells to promote repair and regeneration after injury; inducible macrophage ablation reduces epithelial Wnt signaling, and somatic deletion of Wnt7b in macrophages greatly diminishes kidney repair.","method":"Inducible macrophage ablation, somatic (conditional) Wnt7b deletion in macrophages, canonical Wnt pathway reporter analysis in kidney epithelium","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — two independent genetic approaches (macrophage ablation and macrophage-specific Wnt7b KO) with defined pathway and phenotypic readouts; highly cited","pmids":["20160075"],"is_preprint":false},{"year":2008,"finding":"Wnt7b signals to neighboring cells to activate both autocrine and paracrine canonical Wnt signaling cascades in the developing lung, coordinately increasing replication of both epithelium and mesenchyme to stimulate organ growth without altering differentiation.","method":"Conditional Wnt7b-null mouse, canonical Wnt pathway reporter analysis, cell proliferation assays","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with reporter-validated autocrine and paracrine pathway activation","pmids":["18367557"],"is_preprint":false},{"year":2014,"finding":"WNT7B promotes bone formation through activation of mTORC1 via the PI3K-AKT signaling pathway; genetic disruption of mTORC1 signaling (by deleting Raptor in osteoblast lineage) alleviates the WNT7B-induced high-bone-mass phenotype.","method":"Conditional transgenic overexpression of WNT7B in osteoblast lineage, genetic epistasis with Raptor (mTORC1) conditional KO, bone histomorphometry","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis showing mTORC1 dependency, combined with in vivo overexpression phenotype","pmids":["24497849"],"is_preprint":false},{"year":2017,"finding":"Reck (a GPI-anchored membrane protein) and Gpr124 (an orphan GPCR) are essential co-receptor cofactors specifically required for Wnt7a/Wnt7b signaling in CNS vascular endothelial cells; the N-terminal domain of Reck binds the LRR and Ig domains of Gpr124, and all three proteins (Frizzled, Wnt7a/7b, Reck, Gpr124) form a cell-surface complex to transduce Wnt7-specific signals promoting CNS angiogenesis and blood-brain barrier regulation.","method":"Vascular endothelial cell-specific conditional KOs, targeted mutagenesis of Reck-Gpr124 interface, soluble probe binding assays (Gpr124-LRR-Ig and Reck-CC1-5 probes binding to cells expressing specific components), in vivo CNS angiogenesis analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including mutagenesis, binding assays, and in vivo conditional KOs; replicated in same study with robust mechanistic validation","pmids":["28803732"],"is_preprint":false},{"year":2018,"finding":"In CNS blood-brain barrier and blood-retina barrier maintenance, Wnt7a/Wnt7b and Norrin signaling systems act with partial redundancy through threshold effects; Wnt7a produced by glia in the cerebellum contributes to BBB maintenance, and Tspan12 enhances the amplitude of the Norrin signal in vascular endothelial cells.","method":"Genetic loss-of-function analysis in mice with combined conditional KOs for Wnt7a, Norrin, Fzd4, Tspan12; anatomical localization of cell-type-specific Wnt7a source by glial-specific Cre","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic combinations with defined regional phenotypes; independently validates Wnt7a/7b pathway specificity established in prior Reck/Gpr124 paper","pmids":["30478038"],"is_preprint":false},{"year":2002,"finding":"WNT7B promoter activity in lung epithelium is regulated combinatorially by three transcription factors: TTF-1, GATA6, and Foxa2, which bind specific sites in the proximal 1.0-kb WNT7B promoter; TTF-1 and GATA6 physically interact in vivo and synergistically activate the WNT7B promoter through TTF-1 binding sites.","method":"Electrophoretic mobility shift assays (EMSA), cotransfection luciferase reporter assays, promoter truncation analysis, co-immunoprecipitation (TTF-1/GATA6 interaction)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — EMSA, reporter assays, and protein interaction data in a single study with multiple methods","pmids":["11914369"],"is_preprint":false},{"year":2013,"finding":"WNT7B mediates autocrine Wnt/beta-catenin signaling in pancreatic adenocarcinoma cells; WNT7B knockdown (and blocking Wnt ligand processing/secretion with WLS silencing or IWP-2) suppresses Wnt/beta-catenin transcriptional activity and anchorage-independent growth in PDAC cell lines.","method":"Gene knockdown (siRNA/shRNA), WLS silencing, small molecule inhibition of Wnt secretion (IWP-2), Wnt reporter assay, anchorage-independent growth assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — multiple independent approaches (gene KD, WLS KD, chemical inhibition) converging on same phenotype with pathway validation","pmids":["23416978"],"is_preprint":false},{"year":2013,"finding":"Myeloid cell-derived WNT7B drives the angiogenic switch in mammary tumors by activating Wnt/beta-catenin signaling in vascular endothelial cells, leading to increased VEGFA mRNA and protein expression in those cells; myeloid WNT7B deletion reduces tumor mass, vascular density (VEGFA-dependent), and lung metastasis.","method":"Myeloid-specific conditional Wnt7b deletion in MMTV-PymT mouse model, vascular endothelial cell-specific gene expression profiling, VEGFA mRNA/protein quantification","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — cell-type specific conditional KO with mechanistic pathway dissection (VEC-specific Wnt target gene and VEGFA changes)","pmids":["24638982"],"is_preprint":false},{"year":2013,"finding":"WNT7B is a direct androgen receptor (AR) target gene in prostate cancer; WNT7B promotes androgen-independent growth of castration-resistant prostate cancer cells through activation of protein kinase C (PKC) isozymes (non-canonical Wnt signaling), and cancer-produced WNT7B induces osteoblast differentiation through direct cell-cell interaction.","method":"AR target gene identification, WNT7B knockdown/overexpression in CRPC cell lines, PKC pathway analysis, co-culture osteoblast differentiation assay","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 — multiple functional assays with pathway identification, but PKC mechanism not fully validated with mutagenesis or reconstitution","pmids":["23386686"],"is_preprint":false},{"year":2008,"finding":"Wnt7b is a p53 transcriptional target gene in neuronal PC12 cells; NGF-induced p53 stabilization drives Wnt7b expression, and secreted Wnt7b promotes neurite outgrowth through a non-canonical JNK-dependent signaling mechanism (not beta-catenin), as shown by JNK inhibitor SP600125 blockade and sFRP1 inhibition of Wnt7b-induced JNK phosphorylation.","method":"shRNA-mediated p53 silencing, human TP53 overexpression, Wnt7b overexpression rescue experiment, JNK inhibitor (SP600125) treatment, sFRP1 extracellular addition, beta-catenin nuclear translocation assay","journal":"Differentiation; research in biological diversity","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal approaches (genetic silencing, rescue, chemical inhibitors, secreted antagonist) from single lab","pmids":["18177422"],"is_preprint":false},{"year":2018,"finding":"Wnt7b signals through the Frizzled-7 (Fz7) receptor to promote dendritic arborization in hippocampal neurons via two non-canonical Wnt pathways: phosphorylation of CaMKII and JNK, which are required for dendritic development; Fz7 is developmentally regulated in hippocampus and localizes to neurites and dendritic growth cones.","method":"Fz7 loss-of-function (in vitro and in vivo in hippocampus), Wnt7b gain-of-function, CaMKII and JNK phosphorylation assays, pathway-specific inhibitors","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo and in vitro loss-of-function combined with biochemical pathway validation from single lab","pmids":["29898920"],"is_preprint":false},{"year":2019,"finding":"Wnt7b promotes bone formation in part by stimulating glucose metabolism via increased Glut1 expression and glucose consumption in osteoblast lineage cells; genetic deletion of Glut1 essentially abolishes Wnt7b-induced bone formation in vivo.","method":"Compound transgenic mice (conditional Wnt7b overexpression + conditional Glut1 deletion), bone formation analysis, in vitro osteoblast culture with Glut1 deletion, glucose consumption assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1-2 — genetic epistasis in vivo with matching in vitro mechanistic validation; two independent mouse models converging on same mechanism","pmids":["30913395"],"is_preprint":false},{"year":2016,"finding":"Wnt7b expressed by the ureteric bud epithelium activates canonical Wnt signaling in mural cells of periureteric bud capillaries in the renal medulla; Wnt7b signaling regulates proliferation of these mural cells (through PDGFRbeta and p57kip2) and controls lumen formation of medullary capillary endothelium through modulation of VE-cadherin surface localization.","method":"Immunofluorescence localization of Wnt7b target cells, Wnt7b genetic ablation, immunostaining for PDGFRbeta, p57kip2, VE-cadherin; capillary lumen morphometry","journal":"Journal of the American Society of Nephrology : JASN","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with multiple downstream molecular readouts from single lab","pmids":["27432740"],"is_preprint":false},{"year":2013,"finding":"Dkk1 (Dickkopf-1) antagonizes Wnt7b-induced canonical Wnt signaling in aortic endothelial cells (ECs); Wnt7b and Msx2 together maintain EC differentiation and phenotype, whereas Dkk1 promotes endothelial-mesenchymal transition. EC-specific deletion of Wnt7b (via Cdh5-Cre) upregulates aortic osteogenic genes and nuclear phospho-Smad1/5, and increases collagen and calcium accumulation.","method":"Adenoviral transduction of aortic ECs with Dkk1, Msx2, Wnt7b; EC-specific Wnt7b conditional KO (Cdh5-Cre;Wnt7b fl/fl;LDLR-/-); gene expression and signaling pathway analysis","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 — both in vitro functional studies and in vivo conditional KO with multiple molecular readouts from single lab","pmids":["23685555"],"is_preprint":false},{"year":2021,"finding":"The lncRNA Lnc-Rewind acts as an epigenetic regulator in muscle stem cells by interacting with the G9a histone lysine methyltransferase and mediating H3K9me2 deposition at the nearby Wnt7b gene locus, thereby repressing Wnt7b expression in cis to regulate muscle stem cell proliferation.","method":"lncRNA functional characterization, RNA-protein interaction (Lnc-Rewind/G9a co-immunoprecipitation), ChIP for H3K9me2 at Wnt7b locus, in situ proximity assays","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 — RNA-protein interaction plus ChIP demonstrating epigenetic mechanism from single lab with multiple orthogonal approaches","pmids":["33432928"],"is_preprint":false},{"year":2018,"finding":"LSD1 (KDM1A) epigenetically represses WNT7B expression in osteoblasts via histone demethylase activity; LSD1 deficiency increases WNT7B expression and promotes osteoblast differentiation, and this bone phenotype is attenuated by downregulation of WNT7B-related signaling.","method":"LSD1 knockdown in human MSCs, mesenchymal-specific LSD1 conditional KO in mice, mechanistic in vitro studies with small molecule inhibitors, RNA-seq/gene expression","journal":"Bone research","confidence":"Medium","confidence_rationale":"Tier 2 — both in vitro and in vivo KO with genetic rescue, but direct histone mark at Wnt7b locus not shown in abstract","pmids":["29707403"],"is_preprint":false},{"year":2011,"finding":"Recombinant Dkk1 protein inhibits Wnt7b-induced canonical Wnt signaling in cultured cells, and endogenous Dkk1 in the developing kidney controls the degree of Wnt7b signaling in the papilla; Dkk1 deficiency in the kidney leads to increased canonical Wnt target gene (Lef-1) expression in stromal cells and overgrowth of the papilla.","method":"Conditional kidney-specific Dkk1 KO (Pax8Cre), recombinant Dkk1 protein inhibition of Wnt7b signaling in cell culture, Lef-1 expression analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro biochemical antagonism combined with in vivo genetic epistasis","pmids":["21354128"],"is_preprint":false},{"year":2015,"finding":"Wnt7b is required for epithelial progenitor cell growth in the developing pancreas; Wnt7b deletion causes pancreatic hypoplasia due to reduced progenitor proliferation, and Wnt7b acts through both autocrine and paracrine mechanisms — pancreatic mesenchyme remains competent to respond to Wnt7b (upregulating Lef1, cFos, desmin) even when the epithelium loses competence.","method":"Conditional Wnt7b knockout in pancreatic epithelium, gain-of-function analysis, temporal window experiments, paracrine response assessment in mesenchyme","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with gain-of-function validation and dissection of autocrine/paracrine mechanisms from single lab","pmids":["25576928"],"is_preprint":false},{"year":2020,"finding":"Wnt7b-induced Sox11 expression in bone marrow mesenchymal stem cells (BMSCs) enhances both self-renewal and osteogenic differentiation; mechanistically, Wnt7b activates Ca2+-dependent Nfatc1 signaling to directly induce Sox11 transcription, which in turn activates transcription of Ccnb1, Sox2 (proliferation) and Runx2, Sp7 (osteogenesis); this Wnt7b-Sox11 axis is beta-catenin-independent.","method":"Transgenic mouse overexpression, RNA-seq, ChIP-qPCR (Nfatc1 binding to Sox11 promoter), shRNA knockdown, colony formation, flow cytometry, EdU labeling, ex vivo transplantation","journal":"Stem cells (Dayton, Ohio)","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods including ChIP demonstrating direct transcriptional regulation, from single lab","pmids":["32346881"],"is_preprint":false},{"year":2017,"finding":"WNT7B promotes the migration and differentiation (osteogenic/odontogenic) of human dental pulp cells partly through both the WNT/beta-catenin pathway and the JNK pathway; inhibitors of both pathways (XAV939 and SP600125) partially offset WNT7B-induced differentiation.","method":"Recombinant human WNT7B protein treatment, pathway inhibitors (XAV939, SP600125), ALP activity, alizarin red staining, luciferase reporter assay, western blot, immunocytochemistry","journal":"Archives of oral biology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple pathway assays with pharmacological inhibition, from single lab","pmids":["29268145"],"is_preprint":false},{"year":2022,"finding":"EZH2 interacts with HP1BP3 in glioma stem cells, impairing H3K9 methylation, and the EZH2-HP1BP3 complex epigenetically co-activates WNT7B expression, thereby promoting TMZ resistance and stemness in GBM; inhibition of WNT7B autocrine signaling with LGK974 reverses TMZ resistance.","method":"Co-immunoprecipitation + mass spectrometry, proteomic and transcriptomic analysis, EZH2/HP1BP3 overexpression/knockdown, LGK974 treatment (WNT secretion inhibitor), functional assays (proliferation, self-renewal, TMZ resistance)","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP/MS identification of interaction combined with functional validation from single lab","pmids":["36517590"],"is_preprint":false},{"year":2022,"finding":"WNT7B signals through Frizzled-5 (FZD5) in bladder urothelial carcinoma to activate a tumor-suppressing signaling cascade that includes the transcription factor ELF3, which transcriptionally modulates NOTCH1; this WNT7B/FZD5-ELF3-NOTCH1 axis suppresses EMT, stem-like properties and chemoresistance.","method":"Loss- and gain-of-function studies in bladder cancer cell lines, pathway analysis identifying FZD5 as WNT7B receptor and ELF3/NOTCH1 as downstream components","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Low","confidence_rationale":"Tier 3 — functional studies without direct biochemical validation of FZD5-WNT7B interaction or ELF3 transcriptional mechanism","pmids":["34562599"],"is_preprint":false},{"year":2020,"finding":"WNT7B promotes pancreatic progenitor cell (PPC) proliferation through non-canonical Wnt/PKC signaling (not canonical beta-catenin pathway); feeder cells expressing Wnt7a or Wnt7b (but not other Wnts) enhance PPC proliferation, and the transcription factor YY1 was identified as a regulator of WNT7B transcription through phosphoproteomic analysis.","method":"siRNA screening, stable feeder cell lines expressing different Wnts, canonical Wnt reporter (showing no activation), Wnt/PKC pathway analysis, phosphoproteomics, YY1 transcriptional regulation assays","journal":"Cell chemical biology","confidence":"Medium","confidence_rationale":"Tier 2 — ligand specificity demonstrated with multiple Wnt-expressing feeder lines combined with pathway discrimination assays, from single lab","pmids":["33125912"],"is_preprint":false},{"year":2022,"finding":"WNT7B and WNT7A require GPR124 and RECK as co-activators for signaling specifically in the context of limb development; loss-of-function of Wnt7a/Wnt7b together with Gpr124/Reck causes synergistic limb bone growth defects (reduced/dysmorphic bone, loss of Lmx1b, ectopic nail-like structures), demonstrating the WNT7A/WNT7B-FRIZZLED-LRP5/6-GPR124-RECK complex functions as an integral unit.","method":"Combinatorial conventional and conditional KOs for mouse Wnt7a, Wnt7b, Gpr124, Reck (including a Reck allele specifically defective in WNT7A/B signaling)","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic combinations with graded synergistic phenotypes defining the signaling complex in a new developmental context","pmids":["35552394"],"is_preprint":false},{"year":2024,"finding":"Wnt7b acts as a non-canonical Wnt (ncWnt) ligand together with Wnt5a to regulate cochlear duct elongation, hair cell planar polarity, and asymmetric localization of core PCP proteins Fzd6 and Dvl2; mechanistically, Wnt5a/Wnt7b-mediated ncWnt signaling promotes membrane recruitment of Daple (a non-receptor GEF for Gαi) and activates PI3K/AKT and ERK signaling to drive asymmetric Fzd6 localization.","method":"Conditional double KO of Wnt5a and Wnt7b in cochlea, PCP protein localization analysis, Daple membrane recruitment assay, PI3K/AKT and ERK signaling pathway analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic double KO with detailed mechanistic dissection of downstream signaling components and subcellular localization outcomes","pmids":["39172791"],"is_preprint":false},{"year":2019,"finding":"In developing mouse tooth, Wnt7b promotes proliferation and differentiation of dental mesenchymal cells (odontoblasts/dental papilla cells) through activation of the ERK1/2 pathway; transgenic Wnt7b overexpression in tooth mesenchyme produces thinner predentin and thicker intertubular dentin with higher mineral content; ERK1/2 inhibition partially rescues Wnt7b-induced differentiation.","method":"Transgenic mouse (Dmp1-cre;ROSA26-Wnt7b), micro-CT, adenoviral Wnt7b overexpression in primary cells, western blot for p-ERK1/2, ERK inhibitor rescue experiments","journal":"Archives of oral biology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo transgenic plus in vitro mechanistic validation with pathway inhibitor from single lab","pmids":["31181411"],"is_preprint":false},{"year":2021,"finding":"Wnt7b inhibits osteoclastogenesis by impacting glucose metabolism and AKT activation during osteoclast differentiation from bone marrow macrophages; enforced Wnt7b expression in bone marrow macrophage lineage cells disrupts osteoclast formation and activity and leads to dramatically increased bone mass in vivo.","method":"In vitro osteoclastogenesis assay, transgenic Wnt7b overexpression in macrophage lineage, AKT activation and glucose metabolic assays, bone mass analysis","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo genetic model combined with mechanistic in vitro pathway analysis from single lab","pmids":["34881243"],"is_preprint":false},{"year":2022,"finding":"Biallelic loss-of-function variants in WNT7B cause PDAC syndrome (pulmonary hypoplasia, diaphragmatic anomalies, anophthalmia/microphthalmia, cardiac defects) in humans; identified variants (including p.Arg98*, p.Tyr75*, p.Gly188Ser) are functionally deleterious as demonstrated by canonical Wnt signaling luciferase assay, and wnt7bb mutant zebrafish display swimbladder defects (structural homolog of lung), confirming conservation of WNT7B function in lung-like organ development.","method":"Exome sequencing, canonical WNT signaling luciferase reporter assay for variant validation, wnt7bb zebrafish morphant/mutant analysis","journal":"Journal of medical genetics","confidence":"Medium","confidence_rationale":"Tier 2 — functional validation of human variants with Wnt signaling assay plus zebrafish model, from single study","pmids":["35790350"],"is_preprint":false},{"year":2014,"finding":"Wnt7b can rescue hypertrophic cartilage vascularization in Ihh-null mice but fails to restore osteoblast differentiation in the perichondrium, indicating that Wnt7b expression in the perichondrium (which is downstream of Ihh signaling) contributes specifically to vascularization but not to all aspects of Indian hedgehog-dependent endochondral bone development.","method":"Genetic rescue experiment: Col2-Cre-driven Wnt7b expression from R26-Wnt7b in Ihh-/- background; histology and immunostaining for osteoblast markers and vasculature","journal":"Bone research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis/rescue experiment defining specific role of Wnt7b downstream of Ihh","pmids":["26273517"],"is_preprint":false},{"year":2021,"finding":"In cholestatic liver injury, Wnt7b produced by cholangiocytes induces autocrine cholangiocyte proliferation and proinflammatory cytokine secretion; loss of Wnt7b from cholangiocytes reduces proliferation but promotes hepatocyte reprogramming to a biliary phenotype as compensation, revealing Wnt7b's role in suppressing hepatocyte transdifferentiation toward cholangiocyte identity.","method":"Cholangiocyte-specific (Krt19-Cre) and hepatocyte+cholangiocyte-specific (albumin-Cre) conditional Wnt7b KO; DDC diet cholestasis model; proliferation, senescence, bile acid, and cytokine assays; hepatocyte cholangiocyte marker expression","journal":"Hepatology communications","confidence":"Medium","confidence_rationale":"Tier 2 — two independent conditional KO lines with multiple functional readouts from single lab","pmids":["34558852"],"is_preprint":false},{"year":2023,"finding":"Smad4-dependent BMP signaling in hypertrophic chondrocytes suppresses Wnt7b expression; in Smad4 conditional KO mice, elevated Wnt7b from hypertrophic chondrocytes activates beta-catenin in adjacent osteoblasts and stimulates endochondral ossification; ablation of Wnt7b in this context blunts the bone volume increase.","method":"Smad4 conditional KO in chondrocytes, identification of Wnt7b as increased factor by gene expression analysis, BMP4 stimulation suppressing Wnt7b in vitro, Wnt7b ablation in Smad4 KO background as epistasis experiment","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis experiment (Wnt7b ablation in Smad4 KO) with in vitro BMP4 regulation confirmation from single lab","pmids":["37539462"],"is_preprint":false},{"year":2024,"finding":"WNT7B binds to Frizzled-4 (FZD4) in periodontal ligament stem cells and upregulates FZD4 expression; this WNT7B-FZD4 interaction promotes osteogenic differentiation of LPS-stimulated PDLSCs and suppresses M1 macrophage polarization via conditioned medium; FZD4 silencing reverses these WNT7B-mediated effects.","method":"Co-immunoprecipitation (WNT7B-FZD4 binding), FZD4 siRNA knockdown rescue experiments, osteogenic differentiation assays (ALP activity, alizarin red, gene expression), macrophage polarization assay (CD86, iNOS, cytokines)","journal":"Molecular medicine reports","confidence":"Medium","confidence_rationale":"Tier 2 — direct Co-IP demonstrating binding plus functional rescue experiments, from single lab","pmids":["39301638"],"is_preprint":false}],"current_model":"WNT7B is a secreted Wnt ligand that activates canonical (beta-catenin) signaling by binding Frizzled receptors (Fzd1, Fzd10, Fzd4, Fzd5) with LRP5 as co-receptor, and requires the CNS-specific co-activators RECK and GPR124 for signaling in vascular endothelial cells; it also signals through non-canonical pathways (JNK, CaMKII, PKC, PI3K/AKT, ERK1/2) in a context-dependent manner, functioning as a paracrine signal from macrophages, epithelia, or chondrocytes to drive tissue repair, organ development (lung, kidney, eye, placenta, bone, cochlea), blood-brain barrier maintenance, and tumor angiogenesis, with its transcription regulated by TTF-1/GATA6/Foxa2 in lung epithelium, by p53 in neurons, by LSD1-mediated histone demethylation, and by G9a/H3K9me2 deposition via lncRNA Lnc-Rewind in muscle stem cells."},"narrative":{"teleology":[{"year":2001,"claim":"WNT7B was established as essential for a critical early developmental event—chorioallantoic fusion—revealing its requirement for placentation and identifying α4 integrin as a downstream target in chorion cells.","evidence":"Germline Wnt7b knockout mice showing midgestation lethality from failure of chorion-allantois fusion with loss of α4 integrin expression","pmids":["11543617"],"confidence":"High","gaps":["Mechanism by which WNT7B induces α4 integrin expression not defined","Whether canonical or non-canonical pathway mediates chorion fusion not determined"]},{"year":2002,"claim":"WNT7B was shown to be a lung epithelial morphogen required for mesenchymal proliferation and pulmonary vascular smooth muscle development, and its transcription was found to be cooperatively regulated by TTF-1, GATA6, and Foxa2 through direct promoter binding.","evidence":"Germline Wnt7b KO causing lung hypoplasia and vascular smooth muscle defects; EMSA, co-IP, and reporter assays defining combinatorial transcriptional regulation of the WNT7B promoter","pmids":["12361974","11914369"],"confidence":"High","gaps":["The specific Wnt pathway branch activated in lung mesenchyme was not resolved","Whether WNT7B acts directly on smooth muscle progenitors versus indirectly was not clarified"]},{"year":2005,"claim":"The receptor specificity of WNT7B was defined—it binds FZD1 and FZD10 to activate canonical signaling cooperatively with LRP5—and macrophage-derived WNT7B was shown to act as a short-range paracrine signal triggering endothelial apoptosis during hyaloid vessel regression.","evidence":"Cell-surface binding assays and Wnt reporter assays defining FZD1/FZD10/LRP5 specificity; macrophage-specific genetic model in mice with hyaloid endothelial apoptosis readout","pmids":["15923619","16163358"],"confidence":"High","gaps":["Whether additional Frizzled receptors serve as WNT7B receptors in other tissues was unknown","Mechanism linking canonical Wnt activation to apoptosis in endothelial cells not elucidated"]},{"year":2008,"claim":"WNT7B was shown to operate through both autocrine and paracrine canonical signaling in developing lung to drive coordinated epithelial and mesenchymal proliferation, and independently through a non-canonical JNK pathway downstream of p53 to promote neurite outgrowth, establishing context-dependent pathway selection.","evidence":"Conditional Wnt7b KO in lung with Wnt reporter analysis; shRNA/overexpression and JNK inhibitor studies in neuronal PC12 cells","pmids":["18367557","18177422"],"confidence":"High","gaps":["Determinants of canonical versus JNK pathway selection in different cell types not identified","Direct p53 binding site on WNT7B promoter not shown"]},{"year":2009,"claim":"WNT7B was demonstrated to control the cortico-medullary axis of the kidney by regulating epithelial cell division orientation, acting paracrinally through β-catenin in interstitial cells, as proven by genetic epistasis with interstitial β-catenin deletion.","evidence":"Conditional Wnt7b KO with division plane quantification; β-catenin conditional KO in interstitium phenocopying Wnt7b mutant","pmids":["19060336"],"confidence":"High","gaps":["How WNT7B-activated β-catenin in interstitium feeds back to orient epithelial divisions is unknown","Whether oriented cell division control generalizes to other tubular organs not tested"]},{"year":2010,"claim":"The macrophage-WNT7B paracrine axis was extended from development to adult tissue repair, showing that macrophage-derived WNT7B activates canonical Wnt signaling in injured kidney epithelium to promote regeneration.","evidence":"Inducible macrophage ablation and macrophage-specific conditional Wnt7b deletion in a kidney injury model with Wnt reporter readout","pmids":["20160075"],"confidence":"High","gaps":["Whether other macrophage-derived Wnts compensate partially was not resolved","Downstream transcriptional targets of WNT7B in regenerating kidney epithelium not identified"]},{"year":2013,"claim":"WNT7B was implicated in multiple cancer contexts: autocrine canonical signaling drives anchorage-independent growth in pancreatic adenocarcinoma, myeloid-derived WNT7B activates VEGFA and the angiogenic switch in mammary tumors, and WNT7B is an AR target gene promoting castration-resistant prostate cancer growth via non-canonical PKC signaling.","evidence":"siRNA/shRNA and chemical Wnt secretion inhibition in PDAC cells; myeloid-specific Wnt7b conditional KO in MMTV-PyMT model with VEGFA quantification; AR target gene identification and PKC analysis in CRPC lines","pmids":["23416978","24638982","23386686"],"confidence":"High","gaps":["Whether WNT7B is essential versus redundant with other Wnts in tumor maintenance is not established","Direct PKC isoform specificity downstream of WNT7B in prostate cancer not defined"]},{"year":2014,"claim":"In bone, WNT7B was shown to promote osteoblast-mediated bone formation through activation of mTORC1 via PI3K-AKT, established by genetic epistasis with Raptor deletion, positioning WNT7B as a metabolic regulator in osteogenesis.","evidence":"Conditional WNT7B overexpression in osteoblast lineage with Raptor (mTORC1) conditional KO epistasis and bone histomorphometry","pmids":["24497849"],"confidence":"High","gaps":["Whether the PI3K-AKT-mTORC1 axis represents canonical or non-canonical WNT7B signaling in bone not clarified","Upstream Frizzled receptor identity in osteoblasts unknown"]},{"year":2017,"claim":"RECK and GPR124 were identified as obligate CNS-specific co-activators that form a cell-surface complex with Frizzled and WNT7A/7B, resolving how WNT7B signaling achieves tissue specificity for CNS angiogenesis and blood-brain barrier regulation.","evidence":"Conditional KOs, targeted mutagenesis of RECK-GPR124 interface, soluble probe binding assays, and in vivo CNS angiogenesis analysis","pmids":["28803732"],"confidence":"High","gaps":["Structural basis for WNT7B selectivity for the RECK-GPR124 complex not determined","Whether RECK-GPR124 modulates WNT7B signaling amplitude or simply enables it is unclear"]},{"year":2018,"claim":"Non-canonical WNT7B signaling through Frizzled-7 via CaMKII and JNK was shown to promote dendritic arborization in hippocampal neurons, and WNT7B-driven osteogenesis was found to require Glut1-dependent glucose metabolism, expanding the repertoire of non-canonical effectors and metabolic mediators downstream of WNT7B.","evidence":"Fz7 loss-of-function in hippocampus with CaMKII/JNK phosphorylation assays; compound Wnt7b overexpression + Glut1 conditional KO in bone with glucose consumption measurements","pmids":["29898920","30913395"],"confidence":"High","gaps":["How WNT7B-Fz7 selectively activates CaMKII/JNK rather than β-catenin in neurons is not understood","Whether glucose metabolism is a general feature of WNT7B signaling beyond bone is untested"]},{"year":2020,"claim":"WNT7B was found to activate a β-catenin-independent Ca²⁺/Nfatc1 pathway to induce Sox11, driving both self-renewal and osteogenic differentiation of bone marrow stem cells, and separately to promote pancreatic progenitor proliferation through non-canonical PKC signaling rather than canonical Wnt.","evidence":"ChIP-qPCR for Nfatc1 at the Sox11 promoter with RNA-seq and shRNA validation; siRNA screening and Wnt-expressing feeder cell lines with canonical reporter analysis in pancreatic progenitors","pmids":["32346881","33125912"],"confidence":"Medium","gaps":["Whether the Ca²⁺/Nfatc1/Sox11 axis operates in other WNT7B-responsive cell types is unknown","The specific Frizzled receptor(s) transducing non-canonical PKC signaling in pancreas not identified"]},{"year":2021,"claim":"Epigenetic regulation of WNT7B transcription was established: the lncRNA Lnc-Rewind recruits the G9a methyltransferase to deposit H3K9me2 at the Wnt7b locus in muscle stem cells, repressing its expression to control proliferation.","evidence":"RNA-protein co-IP (Lnc-Rewind/G9a), ChIP for H3K9me2 at Wnt7b locus, and in situ proximity assays in muscle stem cells","pmids":["33432928"],"confidence":"Medium","gaps":["Whether G9a-mediated repression of WNT7B operates in other stem cell populations is unknown","Functional consequences of WNT7B derepression in muscle stem cells not fully characterized in vivo"]},{"year":2022,"claim":"The RECK-GPR124 co-activator requirement was extended beyond CNS vasculature to limb development, and biallelic WNT7B loss-of-function was shown to cause PDAC syndrome in humans (pulmonary hypoplasia, diaphragmatic anomalies, anophthalmia, cardiac defects), validated by signaling assays and zebrafish models.","evidence":"Combinatorial mouse KOs for Wnt7a/7b/Gpr124/Reck in limb; human exome sequencing with canonical Wnt reporter validation of variants and wnt7bb zebrafish mutant analysis","pmids":["35552394","35790350"],"confidence":"High","gaps":["Full phenotypic spectrum of human WNT7B deficiency across additional families not established","Whether RECK-GPR124 dependence applies in all WNT7B developmental contexts beyond CNS and limb is untested"]},{"year":2024,"claim":"WNT7B was shown to cooperate with WNT5A to regulate cochlear planar cell polarity through non-canonical signaling, activating PI3K/AKT and ERK via membrane recruitment of Daple (a Gαi GEF) to drive asymmetric Fzd6 localization, and WNT7B-FZD4 binding was validated by co-IP in periodontal ligament stem cells.","evidence":"Conditional Wnt5a/Wnt7b double KO in cochlea with Daple membrane recruitment and PI3K/AKT/ERK pathway analysis; co-IP of WNT7B-FZD4 with siRNA rescue in PDLSCs","pmids":["39172791","39301638"],"confidence":"High","gaps":["How WNT7B and WNT5A partition or synergize in activating Daple-dependent versus other PCP effectors is unclear","Whether Daple recruitment is a general mechanism for WNT7B non-canonical signaling beyond cochlea is unknown"]},{"year":null,"claim":"The structural basis for WNT7B receptor selectivity (canonical vs. non-canonical) and the determinants that specify which Frizzled receptor and downstream pathway are engaged in a given cell type remain undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal structure of WNT7B in complex with any Frizzled receptor","Molecular basis for tissue-specific pathway selection (canonical vs. JNK vs. PKC vs. PI3K/AKT) not resolved","Whether post-translational modifications of WNT7B itself alter receptor specificity is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,1,4,5,6,8,12,14,15,29]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1,8,29]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[1,4,5,6,12,14]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,4,5,6,7,8,11,12,14,15,23,24,27,29]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,3,4,6,22,28,29,33]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[11,12,13,25,26]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[3,17]}],"complexes":["WNT7B-FZD-LRP5/6-RECK-GPR124 signaling complex"],"partners":["FZD1","FZD10","FZD4","FZD7","LRP5","RECK","GPR124","FZD5"],"other_free_text":[]},"mechanistic_narrative":"WNT7B is a secreted Wnt ligand that functions as a paracrine and autocrine signal to control tissue morphogenesis, vascular development, and organ growth by activating canonical Wnt/β-catenin signaling through Frizzled receptors (Fzd1, Fzd10, Fzd4, Fzd5, Fz7) with LRP5/6 as co-receptors, and in CNS endothelial cells requires the obligate co-activators RECK and GPR124 to form a signaling-competent receptor complex [PMID:15923619, PMID:28803732, PMID:35552394]. WNT7B also engages non-canonical pathways—JNK, CaMKII, PKC, PI3K/AKT, and ERK1/2—in a context-dependent manner to drive neurite outgrowth, dendritic arborization, cochlear planar cell polarity, pancreatic progenitor proliferation, and osteoblast differentiation [PMID:18177422, PMID:29898920, PMID:39172791, PMID:33125912, PMID:31181411]. Produced by epithelia (lung, kidney collecting duct, ureteric bud, chorion, cholangiocytes) and macrophages, WNT7B acts on adjacent mesenchyme, endothelium, or stromal cells to control lung mesenchymal proliferation, kidney medullary patterning via oriented cell division, chorioallantoic fusion, hyaloid vessel regression, tumor angiogenesis via VEGFA induction, and bone formation through mTORC1 and glucose metabolism [PMID:12361974, PMID:19060336, PMID:11543617, PMID:16163358, PMID:24638982, PMID:24497849, PMID:30913395]. Biallelic loss-of-function WNT7B variants cause PDAC syndrome (pulmonary hypoplasia, diaphragmatic anomalies, anophthalmia/microphthalmia, cardiac defects) in humans [PMID:35790350]."},"prefetch_data":{"uniprot":{"accession":"P56706","full_name":"Protein Wnt-7b","aliases":[],"length_aa":349,"mass_kda":39.3,"function":"Ligand for members of the frizzled family of seven transmembrane receptors that functions in the canonical Wnt/beta-catenin signaling pathway (PubMed:30026314). Required for normal fusion of the chorion and the allantois during placenta development (By similarity). Required for central nervous system (CNS) angiogenesis and blood-brain barrier regulation (PubMed:30026314)","subcellular_location":"Secreted, extracellular space, extracellular matrix; Secreted","url":"https://www.uniprot.org/uniprotkb/P56706/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WNT7B","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/WNT7B","total_profiled":1310},"omim":[{"mim_id":"604616","title":"T-BOX, BRAIN, 1; TBR1","url":"https://www.omim.org/entry/604616"},{"mim_id":"603490","title":"WINGLESS-TYPE MMTV INTEGRATION SITE FAMILY, MEMBER 4; WNT4","url":"https://www.omim.org/entry/603490"},{"mim_id":"601967","title":"WINGLESS-TYPE MMTV INTEGRATION SITE 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pathway) in a cell-specific manner by binding directly to Frizzled-1 (Fzd1) and Frizzled-10 (Fzd10) on the cell surface, and cooperatively activates canonical Wnt signaling with these receptors in the presence of LRP5 co-receptor.\",\n      \"method\": \"Cell transfection assays, biochemical binding studies (cell-surface binding), canonical vs. non-canonical Wnt pathway reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct biochemical binding assay plus functional reporter assays demonstrating receptor specificity with multiple cell lines\",\n      \"pmids\": [\"15923619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Macrophage-derived WNT7B is a short-range paracrine signal that activates the canonical WNT pathway in adjacent vascular endothelial cells of the hyaloid vessels, initiating programmed cell death (apoptosis) in those target cells during eye development.\",\n      \"method\": \"Genetic mouse model (macrophage-specific Wnt7b expression), in vivo analysis of WNT-pathway responses and apoptosis in hyaloid vessel endothelial cells\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic loss-of-function in mice with defined cellular phenotype (apoptosis of hyaloid endothelial cells), replicated with pathway reporter analysis; highly cited foundational paper\",\n      \"pmids\": [\"16163358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Wnt7b expressed in the airway epithelium is required for mesenchymal proliferation and vascular smooth muscle development in the lung; loss of Wnt7b causes lung hypoplasia and defects in smooth muscle of major pulmonary vessels.\",\n      \"method\": \"Germline mouse knockout (lacZ replacement of first exon), histology and phenotypic analysis of Wnt7b-null mice\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean germline KO with well-defined perinatal lethal phenotype and distinct cellular defects in lung mesenchyme and vascular smooth muscle\",\n      \"pmids\": [\"12361974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Wnt7b expression in the chorion is required for chorioallantoic fusion during placental development; loss of Wnt7b leads to failure of chorion-allantois fusion, loss of alpha4 integrin expression in chorion cells, and midgestation lethality.\",\n      \"method\": \"Targeted germline mouse mutation (gene knockout), immunostaining for alpha4 integrin, phenotypic analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined midgestation lethal phenotype and identified downstream molecular change (loss of alpha4 integrin)\",\n      \"pmids\": [\"11543617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Wnt7b, expressed by the collecting duct epithelium, regulates the orientation of epithelial cell division planes to establish the cortico-medullary axis of the kidney; in Wnt7b mutants, cell divisions are biased radially instead of longitudinally. Wnt7b acts paracrinally through the canonical Wnt/beta-catenin pathway in the surrounding interstitium, as shown by the fact that removal of beta-catenin from Wnt-responsive interstitium phenocopies the Wnt7b mutant medullary deficiency.\",\n      \"method\": \"Conditional mouse knockout, division plane analysis, genetic epistasis (beta-catenin conditional KO in interstitium phenocopying Wnt7b KO)\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal approaches including epistasis, cell division analysis, and pathway reporter studies in a single study\",\n      \"pmids\": [\"19060336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Macrophage-derived Wnt7b stimulates canonical Wnt pathway responses in kidney epithelial cells to promote repair and regeneration after injury; inducible macrophage ablation reduces epithelial Wnt signaling, and somatic deletion of Wnt7b in macrophages greatly diminishes kidney repair.\",\n      \"method\": \"Inducible macrophage ablation, somatic (conditional) Wnt7b deletion in macrophages, canonical Wnt pathway reporter analysis in kidney epithelium\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two independent genetic approaches (macrophage ablation and macrophage-specific Wnt7b KO) with defined pathway and phenotypic readouts; highly cited\",\n      \"pmids\": [\"20160075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Wnt7b signals to neighboring cells to activate both autocrine and paracrine canonical Wnt signaling cascades in the developing lung, coordinately increasing replication of both epithelium and mesenchyme to stimulate organ growth without altering differentiation.\",\n      \"method\": \"Conditional Wnt7b-null mouse, canonical Wnt pathway reporter analysis, cell proliferation assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with reporter-validated autocrine and paracrine pathway activation\",\n      \"pmids\": [\"18367557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"WNT7B promotes bone formation through activation of mTORC1 via the PI3K-AKT signaling pathway; genetic disruption of mTORC1 signaling (by deleting Raptor in osteoblast lineage) alleviates the WNT7B-induced high-bone-mass phenotype.\",\n      \"method\": \"Conditional transgenic overexpression of WNT7B in osteoblast lineage, genetic epistasis with Raptor (mTORC1) conditional KO, bone histomorphometry\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis showing mTORC1 dependency, combined with in vivo overexpression phenotype\",\n      \"pmids\": [\"24497849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Reck (a GPI-anchored membrane protein) and Gpr124 (an orphan GPCR) are essential co-receptor cofactors specifically required for Wnt7a/Wnt7b signaling in CNS vascular endothelial cells; the N-terminal domain of Reck binds the LRR and Ig domains of Gpr124, and all three proteins (Frizzled, Wnt7a/7b, Reck, Gpr124) form a cell-surface complex to transduce Wnt7-specific signals promoting CNS angiogenesis and blood-brain barrier regulation.\",\n      \"method\": \"Vascular endothelial cell-specific conditional KOs, targeted mutagenesis of Reck-Gpr124 interface, soluble probe binding assays (Gpr124-LRR-Ig and Reck-CC1-5 probes binding to cells expressing specific components), in vivo CNS angiogenesis analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including mutagenesis, binding assays, and in vivo conditional KOs; replicated in same study with robust mechanistic validation\",\n      \"pmids\": [\"28803732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In CNS blood-brain barrier and blood-retina barrier maintenance, Wnt7a/Wnt7b and Norrin signaling systems act with partial redundancy through threshold effects; Wnt7a produced by glia in the cerebellum contributes to BBB maintenance, and Tspan12 enhances the amplitude of the Norrin signal in vascular endothelial cells.\",\n      \"method\": \"Genetic loss-of-function analysis in mice with combined conditional KOs for Wnt7a, Norrin, Fzd4, Tspan12; anatomical localization of cell-type-specific Wnt7a source by glial-specific Cre\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic combinations with defined regional phenotypes; independently validates Wnt7a/7b pathway specificity established in prior Reck/Gpr124 paper\",\n      \"pmids\": [\"30478038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"WNT7B promoter activity in lung epithelium is regulated combinatorially by three transcription factors: TTF-1, GATA6, and Foxa2, which bind specific sites in the proximal 1.0-kb WNT7B promoter; TTF-1 and GATA6 physically interact in vivo and synergistically activate the WNT7B promoter through TTF-1 binding sites.\",\n      \"method\": \"Electrophoretic mobility shift assays (EMSA), cotransfection luciferase reporter assays, promoter truncation analysis, co-immunoprecipitation (TTF-1/GATA6 interaction)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — EMSA, reporter assays, and protein interaction data in a single study with multiple methods\",\n      \"pmids\": [\"11914369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WNT7B mediates autocrine Wnt/beta-catenin signaling in pancreatic adenocarcinoma cells; WNT7B knockdown (and blocking Wnt ligand processing/secretion with WLS silencing or IWP-2) suppresses Wnt/beta-catenin transcriptional activity and anchorage-independent growth in PDAC cell lines.\",\n      \"method\": \"Gene knockdown (siRNA/shRNA), WLS silencing, small molecule inhibition of Wnt secretion (IWP-2), Wnt reporter assay, anchorage-independent growth assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple independent approaches (gene KD, WLS KD, chemical inhibition) converging on same phenotype with pathway validation\",\n      \"pmids\": [\"23416978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Myeloid cell-derived WNT7B drives the angiogenic switch in mammary tumors by activating Wnt/beta-catenin signaling in vascular endothelial cells, leading to increased VEGFA mRNA and protein expression in those cells; myeloid WNT7B deletion reduces tumor mass, vascular density (VEGFA-dependent), and lung metastasis.\",\n      \"method\": \"Myeloid-specific conditional Wnt7b deletion in MMTV-PymT mouse model, vascular endothelial cell-specific gene expression profiling, VEGFA mRNA/protein quantification\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type specific conditional KO with mechanistic pathway dissection (VEC-specific Wnt target gene and VEGFA changes)\",\n      \"pmids\": [\"24638982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WNT7B is a direct androgen receptor (AR) target gene in prostate cancer; WNT7B promotes androgen-independent growth of castration-resistant prostate cancer cells through activation of protein kinase C (PKC) isozymes (non-canonical Wnt signaling), and cancer-produced WNT7B induces osteoblast differentiation through direct cell-cell interaction.\",\n      \"method\": \"AR target gene identification, WNT7B knockdown/overexpression in CRPC cell lines, PKC pathway analysis, co-culture osteoblast differentiation assay\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays with pathway identification, but PKC mechanism not fully validated with mutagenesis or reconstitution\",\n      \"pmids\": [\"23386686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Wnt7b is a p53 transcriptional target gene in neuronal PC12 cells; NGF-induced p53 stabilization drives Wnt7b expression, and secreted Wnt7b promotes neurite outgrowth through a non-canonical JNK-dependent signaling mechanism (not beta-catenin), as shown by JNK inhibitor SP600125 blockade and sFRP1 inhibition of Wnt7b-induced JNK phosphorylation.\",\n      \"method\": \"shRNA-mediated p53 silencing, human TP53 overexpression, Wnt7b overexpression rescue experiment, JNK inhibitor (SP600125) treatment, sFRP1 extracellular addition, beta-catenin nuclear translocation assay\",\n      \"journal\": \"Differentiation; research in biological diversity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (genetic silencing, rescue, chemical inhibitors, secreted antagonist) from single lab\",\n      \"pmids\": [\"18177422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Wnt7b signals through the Frizzled-7 (Fz7) receptor to promote dendritic arborization in hippocampal neurons via two non-canonical Wnt pathways: phosphorylation of CaMKII and JNK, which are required for dendritic development; Fz7 is developmentally regulated in hippocampus and localizes to neurites and dendritic growth cones.\",\n      \"method\": \"Fz7 loss-of-function (in vitro and in vivo in hippocampus), Wnt7b gain-of-function, CaMKII and JNK phosphorylation assays, pathway-specific inhibitors\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and in vitro loss-of-function combined with biochemical pathway validation from single lab\",\n      \"pmids\": [\"29898920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Wnt7b promotes bone formation in part by stimulating glucose metabolism via increased Glut1 expression and glucose consumption in osteoblast lineage cells; genetic deletion of Glut1 essentially abolishes Wnt7b-induced bone formation in vivo.\",\n      \"method\": \"Compound transgenic mice (conditional Wnt7b overexpression + conditional Glut1 deletion), bone formation analysis, in vitro osteoblast culture with Glut1 deletion, glucose consumption assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic epistasis in vivo with matching in vitro mechanistic validation; two independent mouse models converging on same mechanism\",\n      \"pmids\": [\"30913395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Wnt7b expressed by the ureteric bud epithelium activates canonical Wnt signaling in mural cells of periureteric bud capillaries in the renal medulla; Wnt7b signaling regulates proliferation of these mural cells (through PDGFRbeta and p57kip2) and controls lumen formation of medullary capillary endothelium through modulation of VE-cadherin surface localization.\",\n      \"method\": \"Immunofluorescence localization of Wnt7b target cells, Wnt7b genetic ablation, immunostaining for PDGFRbeta, p57kip2, VE-cadherin; capillary lumen morphometry\",\n      \"journal\": \"Journal of the American Society of Nephrology : JASN\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple downstream molecular readouts from single lab\",\n      \"pmids\": [\"27432740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dkk1 (Dickkopf-1) antagonizes Wnt7b-induced canonical Wnt signaling in aortic endothelial cells (ECs); Wnt7b and Msx2 together maintain EC differentiation and phenotype, whereas Dkk1 promotes endothelial-mesenchymal transition. EC-specific deletion of Wnt7b (via Cdh5-Cre) upregulates aortic osteogenic genes and nuclear phospho-Smad1/5, and increases collagen and calcium accumulation.\",\n      \"method\": \"Adenoviral transduction of aortic ECs with Dkk1, Msx2, Wnt7b; EC-specific Wnt7b conditional KO (Cdh5-Cre;Wnt7b fl/fl;LDLR-/-); gene expression and signaling pathway analysis\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — both in vitro functional studies and in vivo conditional KO with multiple molecular readouts from single lab\",\n      \"pmids\": [\"23685555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The lncRNA Lnc-Rewind acts as an epigenetic regulator in muscle stem cells by interacting with the G9a histone lysine methyltransferase and mediating H3K9me2 deposition at the nearby Wnt7b gene locus, thereby repressing Wnt7b expression in cis to regulate muscle stem cell proliferation.\",\n      \"method\": \"lncRNA functional characterization, RNA-protein interaction (Lnc-Rewind/G9a co-immunoprecipitation), ChIP for H3K9me2 at Wnt7b locus, in situ proximity assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNA-protein interaction plus ChIP demonstrating epigenetic mechanism from single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"33432928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LSD1 (KDM1A) epigenetically represses WNT7B expression in osteoblasts via histone demethylase activity; LSD1 deficiency increases WNT7B expression and promotes osteoblast differentiation, and this bone phenotype is attenuated by downregulation of WNT7B-related signaling.\",\n      \"method\": \"LSD1 knockdown in human MSCs, mesenchymal-specific LSD1 conditional KO in mice, mechanistic in vitro studies with small molecule inhibitors, RNA-seq/gene expression\",\n      \"journal\": \"Bone research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — both in vitro and in vivo KO with genetic rescue, but direct histone mark at Wnt7b locus not shown in abstract\",\n      \"pmids\": [\"29707403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Recombinant Dkk1 protein inhibits Wnt7b-induced canonical Wnt signaling in cultured cells, and endogenous Dkk1 in the developing kidney controls the degree of Wnt7b signaling in the papilla; Dkk1 deficiency in the kidney leads to increased canonical Wnt target gene (Lef-1) expression in stromal cells and overgrowth of the papilla.\",\n      \"method\": \"Conditional kidney-specific Dkk1 KO (Pax8Cre), recombinant Dkk1 protein inhibition of Wnt7b signaling in cell culture, Lef-1 expression analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro biochemical antagonism combined with in vivo genetic epistasis\",\n      \"pmids\": [\"21354128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Wnt7b is required for epithelial progenitor cell growth in the developing pancreas; Wnt7b deletion causes pancreatic hypoplasia due to reduced progenitor proliferation, and Wnt7b acts through both autocrine and paracrine mechanisms — pancreatic mesenchyme remains competent to respond to Wnt7b (upregulating Lef1, cFos, desmin) even when the epithelium loses competence.\",\n      \"method\": \"Conditional Wnt7b knockout in pancreatic epithelium, gain-of-function analysis, temporal window experiments, paracrine response assessment in mesenchyme\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with gain-of-function validation and dissection of autocrine/paracrine mechanisms from single lab\",\n      \"pmids\": [\"25576928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Wnt7b-induced Sox11 expression in bone marrow mesenchymal stem cells (BMSCs) enhances both self-renewal and osteogenic differentiation; mechanistically, Wnt7b activates Ca2+-dependent Nfatc1 signaling to directly induce Sox11 transcription, which in turn activates transcription of Ccnb1, Sox2 (proliferation) and Runx2, Sp7 (osteogenesis); this Wnt7b-Sox11 axis is beta-catenin-independent.\",\n      \"method\": \"Transgenic mouse overexpression, RNA-seq, ChIP-qPCR (Nfatc1 binding to Sox11 promoter), shRNA knockdown, colony formation, flow cytometry, EdU labeling, ex vivo transplantation\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including ChIP demonstrating direct transcriptional regulation, from single lab\",\n      \"pmids\": [\"32346881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"WNT7B promotes the migration and differentiation (osteogenic/odontogenic) of human dental pulp cells partly through both the WNT/beta-catenin pathway and the JNK pathway; inhibitors of both pathways (XAV939 and SP600125) partially offset WNT7B-induced differentiation.\",\n      \"method\": \"Recombinant human WNT7B protein treatment, pathway inhibitors (XAV939, SP600125), ALP activity, alizarin red staining, luciferase reporter assay, western blot, immunocytochemistry\",\n      \"journal\": \"Archives of oral biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple pathway assays with pharmacological inhibition, from single lab\",\n      \"pmids\": [\"29268145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"EZH2 interacts with HP1BP3 in glioma stem cells, impairing H3K9 methylation, and the EZH2-HP1BP3 complex epigenetically co-activates WNT7B expression, thereby promoting TMZ resistance and stemness in GBM; inhibition of WNT7B autocrine signaling with LGK974 reverses TMZ resistance.\",\n      \"method\": \"Co-immunoprecipitation + mass spectrometry, proteomic and transcriptomic analysis, EZH2/HP1BP3 overexpression/knockdown, LGK974 treatment (WNT secretion inhibitor), functional assays (proliferation, self-renewal, TMZ resistance)\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP/MS identification of interaction combined with functional validation from single lab\",\n      \"pmids\": [\"36517590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WNT7B signals through Frizzled-5 (FZD5) in bladder urothelial carcinoma to activate a tumor-suppressing signaling cascade that includes the transcription factor ELF3, which transcriptionally modulates NOTCH1; this WNT7B/FZD5-ELF3-NOTCH1 axis suppresses EMT, stem-like properties and chemoresistance.\",\n      \"method\": \"Loss- and gain-of-function studies in bladder cancer cell lines, pathway analysis identifying FZD5 as WNT7B receptor and ELF3/NOTCH1 as downstream components\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — functional studies without direct biochemical validation of FZD5-WNT7B interaction or ELF3 transcriptional mechanism\",\n      \"pmids\": [\"34562599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WNT7B promotes pancreatic progenitor cell (PPC) proliferation through non-canonical Wnt/PKC signaling (not canonical beta-catenin pathway); feeder cells expressing Wnt7a or Wnt7b (but not other Wnts) enhance PPC proliferation, and the transcription factor YY1 was identified as a regulator of WNT7B transcription through phosphoproteomic analysis.\",\n      \"method\": \"siRNA screening, stable feeder cell lines expressing different Wnts, canonical Wnt reporter (showing no activation), Wnt/PKC pathway analysis, phosphoproteomics, YY1 transcriptional regulation assays\",\n      \"journal\": \"Cell chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ligand specificity demonstrated with multiple Wnt-expressing feeder lines combined with pathway discrimination assays, from single lab\",\n      \"pmids\": [\"33125912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WNT7B and WNT7A require GPR124 and RECK as co-activators for signaling specifically in the context of limb development; loss-of-function of Wnt7a/Wnt7b together with Gpr124/Reck causes synergistic limb bone growth defects (reduced/dysmorphic bone, loss of Lmx1b, ectopic nail-like structures), demonstrating the WNT7A/WNT7B-FRIZZLED-LRP5/6-GPR124-RECK complex functions as an integral unit.\",\n      \"method\": \"Combinatorial conventional and conditional KOs for mouse Wnt7a, Wnt7b, Gpr124, Reck (including a Reck allele specifically defective in WNT7A/B signaling)\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic combinations with graded synergistic phenotypes defining the signaling complex in a new developmental context\",\n      \"pmids\": [\"35552394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Wnt7b acts as a non-canonical Wnt (ncWnt) ligand together with Wnt5a to regulate cochlear duct elongation, hair cell planar polarity, and asymmetric localization of core PCP proteins Fzd6 and Dvl2; mechanistically, Wnt5a/Wnt7b-mediated ncWnt signaling promotes membrane recruitment of Daple (a non-receptor GEF for Gαi) and activates PI3K/AKT and ERK signaling to drive asymmetric Fzd6 localization.\",\n      \"method\": \"Conditional double KO of Wnt5a and Wnt7b in cochlea, PCP protein localization analysis, Daple membrane recruitment assay, PI3K/AKT and ERK signaling pathway analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic double KO with detailed mechanistic dissection of downstream signaling components and subcellular localization outcomes\",\n      \"pmids\": [\"39172791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In developing mouse tooth, Wnt7b promotes proliferation and differentiation of dental mesenchymal cells (odontoblasts/dental papilla cells) through activation of the ERK1/2 pathway; transgenic Wnt7b overexpression in tooth mesenchyme produces thinner predentin and thicker intertubular dentin with higher mineral content; ERK1/2 inhibition partially rescues Wnt7b-induced differentiation.\",\n      \"method\": \"Transgenic mouse (Dmp1-cre;ROSA26-Wnt7b), micro-CT, adenoviral Wnt7b overexpression in primary cells, western blot for p-ERK1/2, ERK inhibitor rescue experiments\",\n      \"journal\": \"Archives of oral biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic plus in vitro mechanistic validation with pathway inhibitor from single lab\",\n      \"pmids\": [\"31181411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Wnt7b inhibits osteoclastogenesis by impacting glucose metabolism and AKT activation during osteoclast differentiation from bone marrow macrophages; enforced Wnt7b expression in bone marrow macrophage lineage cells disrupts osteoclast formation and activity and leads to dramatically increased bone mass in vivo.\",\n      \"method\": \"In vitro osteoclastogenesis assay, transgenic Wnt7b overexpression in macrophage lineage, AKT activation and glucose metabolic assays, bone mass analysis\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model combined with mechanistic in vitro pathway analysis from single lab\",\n      \"pmids\": [\"34881243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Biallelic loss-of-function variants in WNT7B cause PDAC syndrome (pulmonary hypoplasia, diaphragmatic anomalies, anophthalmia/microphthalmia, cardiac defects) in humans; identified variants (including p.Arg98*, p.Tyr75*, p.Gly188Ser) are functionally deleterious as demonstrated by canonical Wnt signaling luciferase assay, and wnt7bb mutant zebrafish display swimbladder defects (structural homolog of lung), confirming conservation of WNT7B function in lung-like organ development.\",\n      \"method\": \"Exome sequencing, canonical WNT signaling luciferase reporter assay for variant validation, wnt7bb zebrafish morphant/mutant analysis\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional validation of human variants with Wnt signaling assay plus zebrafish model, from single study\",\n      \"pmids\": [\"35790350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Wnt7b can rescue hypertrophic cartilage vascularization in Ihh-null mice but fails to restore osteoblast differentiation in the perichondrium, indicating that Wnt7b expression in the perichondrium (which is downstream of Ihh signaling) contributes specifically to vascularization but not to all aspects of Indian hedgehog-dependent endochondral bone development.\",\n      \"method\": \"Genetic rescue experiment: Col2-Cre-driven Wnt7b expression from R26-Wnt7b in Ihh-/- background; histology and immunostaining for osteoblast markers and vasculature\",\n      \"journal\": \"Bone research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis/rescue experiment defining specific role of Wnt7b downstream of Ihh\",\n      \"pmids\": [\"26273517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In cholestatic liver injury, Wnt7b produced by cholangiocytes induces autocrine cholangiocyte proliferation and proinflammatory cytokine secretion; loss of Wnt7b from cholangiocytes reduces proliferation but promotes hepatocyte reprogramming to a biliary phenotype as compensation, revealing Wnt7b's role in suppressing hepatocyte transdifferentiation toward cholangiocyte identity.\",\n      \"method\": \"Cholangiocyte-specific (Krt19-Cre) and hepatocyte+cholangiocyte-specific (albumin-Cre) conditional Wnt7b KO; DDC diet cholestasis model; proliferation, senescence, bile acid, and cytokine assays; hepatocyte cholangiocyte marker expression\",\n      \"journal\": \"Hepatology communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two independent conditional KO lines with multiple functional readouts from single lab\",\n      \"pmids\": [\"34558852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Smad4-dependent BMP signaling in hypertrophic chondrocytes suppresses Wnt7b expression; in Smad4 conditional KO mice, elevated Wnt7b from hypertrophic chondrocytes activates beta-catenin in adjacent osteoblasts and stimulates endochondral ossification; ablation of Wnt7b in this context blunts the bone volume increase.\",\n      \"method\": \"Smad4 conditional KO in chondrocytes, identification of Wnt7b as increased factor by gene expression analysis, BMP4 stimulation suppressing Wnt7b in vitro, Wnt7b ablation in Smad4 KO background as epistasis experiment\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis experiment (Wnt7b ablation in Smad4 KO) with in vitro BMP4 regulation confirmation from single lab\",\n      \"pmids\": [\"37539462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WNT7B binds to Frizzled-4 (FZD4) in periodontal ligament stem cells and upregulates FZD4 expression; this WNT7B-FZD4 interaction promotes osteogenic differentiation of LPS-stimulated PDLSCs and suppresses M1 macrophage polarization via conditioned medium; FZD4 silencing reverses these WNT7B-mediated effects.\",\n      \"method\": \"Co-immunoprecipitation (WNT7B-FZD4 binding), FZD4 siRNA knockdown rescue experiments, osteogenic differentiation assays (ALP activity, alizarin red, gene expression), macrophage polarization assay (CD86, iNOS, cytokines)\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct Co-IP demonstrating binding plus functional rescue experiments, from single lab\",\n      \"pmids\": [\"39301638\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WNT7B is a secreted Wnt ligand that activates canonical (beta-catenin) signaling by binding Frizzled receptors (Fzd1, Fzd10, Fzd4, Fzd5) with LRP5 as co-receptor, and requires the CNS-specific co-activators RECK and GPR124 for signaling in vascular endothelial cells; it also signals through non-canonical pathways (JNK, CaMKII, PKC, PI3K/AKT, ERK1/2) in a context-dependent manner, functioning as a paracrine signal from macrophages, epithelia, or chondrocytes to drive tissue repair, organ development (lung, kidney, eye, placenta, bone, cochlea), blood-brain barrier maintenance, and tumor angiogenesis, with its transcription regulated by TTF-1/GATA6/Foxa2 in lung epithelium, by p53 in neurons, by LSD1-mediated histone demethylation, and by G9a/H3K9me2 deposition via lncRNA Lnc-Rewind in muscle stem cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"WNT7B is a secreted Wnt ligand that functions as a paracrine and autocrine signal to control tissue morphogenesis, vascular development, and organ growth by activating canonical Wnt/β-catenin signaling through Frizzled receptors (Fzd1, Fzd10, Fzd4, Fzd5, Fz7) with LRP5/6 as co-receptors, and in CNS endothelial cells requires the obligate co-activators RECK and GPR124 to form a signaling-competent receptor complex [PMID:15923619, PMID:28803732, PMID:35552394]. WNT7B also engages non-canonical pathways—JNK, CaMKII, PKC, PI3K/AKT, and ERK1/2—in a context-dependent manner to drive neurite outgrowth, dendritic arborization, cochlear planar cell polarity, pancreatic progenitor proliferation, and osteoblast differentiation [PMID:18177422, PMID:29898920, PMID:39172791, PMID:33125912, PMID:31181411]. Produced by epithelia (lung, kidney collecting duct, ureteric bud, chorion, cholangiocytes) and macrophages, WNT7B acts on adjacent mesenchyme, endothelium, or stromal cells to control lung mesenchymal proliferation, kidney medullary patterning via oriented cell division, chorioallantoic fusion, hyaloid vessel regression, tumor angiogenesis via VEGFA induction, and bone formation through mTORC1 and glucose metabolism [PMID:12361974, PMID:19060336, PMID:11543617, PMID:16163358, PMID:24638982, PMID:24497849, PMID:30913395]. Biallelic loss-of-function WNT7B variants cause PDAC syndrome (pulmonary hypoplasia, diaphragmatic anomalies, anophthalmia/microphthalmia, cardiac defects) in humans [PMID:35790350].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"WNT7B was established as essential for a critical early developmental event—chorioallantoic fusion—revealing its requirement for placentation and identifying α4 integrin as a downstream target in chorion cells.\",\n      \"evidence\": \"Germline Wnt7b knockout mice showing midgestation lethality from failure of chorion-allantois fusion with loss of α4 integrin expression\",\n      \"pmids\": [\"11543617\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which WNT7B induces α4 integrin expression not defined\", \"Whether canonical or non-canonical pathway mediates chorion fusion not determined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"WNT7B was shown to be a lung epithelial morphogen required for mesenchymal proliferation and pulmonary vascular smooth muscle development, and its transcription was found to be cooperatively regulated by TTF-1, GATA6, and Foxa2 through direct promoter binding.\",\n      \"evidence\": \"Germline Wnt7b KO causing lung hypoplasia and vascular smooth muscle defects; EMSA, co-IP, and reporter assays defining combinatorial transcriptional regulation of the WNT7B promoter\",\n      \"pmids\": [\"12361974\", \"11914369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The specific Wnt pathway branch activated in lung mesenchyme was not resolved\", \"Whether WNT7B acts directly on smooth muscle progenitors versus indirectly was not clarified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The receptor specificity of WNT7B was defined—it binds FZD1 and FZD10 to activate canonical signaling cooperatively with LRP5—and macrophage-derived WNT7B was shown to act as a short-range paracrine signal triggering endothelial apoptosis during hyaloid vessel regression.\",\n      \"evidence\": \"Cell-surface binding assays and Wnt reporter assays defining FZD1/FZD10/LRP5 specificity; macrophage-specific genetic model in mice with hyaloid endothelial apoptosis readout\",\n      \"pmids\": [\"15923619\", \"16163358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional Frizzled receptors serve as WNT7B receptors in other tissues was unknown\", \"Mechanism linking canonical Wnt activation to apoptosis in endothelial cells not elucidated\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"WNT7B was shown to operate through both autocrine and paracrine canonical signaling in developing lung to drive coordinated epithelial and mesenchymal proliferation, and independently through a non-canonical JNK pathway downstream of p53 to promote neurite outgrowth, establishing context-dependent pathway selection.\",\n      \"evidence\": \"Conditional Wnt7b KO in lung with Wnt reporter analysis; shRNA/overexpression and JNK inhibitor studies in neuronal PC12 cells\",\n      \"pmids\": [\"18367557\", \"18177422\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of canonical versus JNK pathway selection in different cell types not identified\", \"Direct p53 binding site on WNT7B promoter not shown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"WNT7B was demonstrated to control the cortico-medullary axis of the kidney by regulating epithelial cell division orientation, acting paracrinally through β-catenin in interstitial cells, as proven by genetic epistasis with interstitial β-catenin deletion.\",\n      \"evidence\": \"Conditional Wnt7b KO with division plane quantification; β-catenin conditional KO in interstitium phenocopying Wnt7b mutant\",\n      \"pmids\": [\"19060336\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How WNT7B-activated β-catenin in interstitium feeds back to orient epithelial divisions is unknown\", \"Whether oriented cell division control generalizes to other tubular organs not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The macrophage-WNT7B paracrine axis was extended from development to adult tissue repair, showing that macrophage-derived WNT7B activates canonical Wnt signaling in injured kidney epithelium to promote regeneration.\",\n      \"evidence\": \"Inducible macrophage ablation and macrophage-specific conditional Wnt7b deletion in a kidney injury model with Wnt reporter readout\",\n      \"pmids\": [\"20160075\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other macrophage-derived Wnts compensate partially was not resolved\", \"Downstream transcriptional targets of WNT7B in regenerating kidney epithelium not identified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"WNT7B was implicated in multiple cancer contexts: autocrine canonical signaling drives anchorage-independent growth in pancreatic adenocarcinoma, myeloid-derived WNT7B activates VEGFA and the angiogenic switch in mammary tumors, and WNT7B is an AR target gene promoting castration-resistant prostate cancer growth via non-canonical PKC signaling.\",\n      \"evidence\": \"siRNA/shRNA and chemical Wnt secretion inhibition in PDAC cells; myeloid-specific Wnt7b conditional KO in MMTV-PyMT model with VEGFA quantification; AR target gene identification and PKC analysis in CRPC lines\",\n      \"pmids\": [\"23416978\", \"24638982\", \"23386686\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether WNT7B is essential versus redundant with other Wnts in tumor maintenance is not established\", \"Direct PKC isoform specificity downstream of WNT7B in prostate cancer not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"In bone, WNT7B was shown to promote osteoblast-mediated bone formation through activation of mTORC1 via PI3K-AKT, established by genetic epistasis with Raptor deletion, positioning WNT7B as a metabolic regulator in osteogenesis.\",\n      \"evidence\": \"Conditional WNT7B overexpression in osteoblast lineage with Raptor (mTORC1) conditional KO epistasis and bone histomorphometry\",\n      \"pmids\": [\"24497849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the PI3K-AKT-mTORC1 axis represents canonical or non-canonical WNT7B signaling in bone not clarified\", \"Upstream Frizzled receptor identity in osteoblasts unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"RECK and GPR124 were identified as obligate CNS-specific co-activators that form a cell-surface complex with Frizzled and WNT7A/7B, resolving how WNT7B signaling achieves tissue specificity for CNS angiogenesis and blood-brain barrier regulation.\",\n      \"evidence\": \"Conditional KOs, targeted mutagenesis of RECK-GPR124 interface, soluble probe binding assays, and in vivo CNS angiogenesis analysis\",\n      \"pmids\": [\"28803732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for WNT7B selectivity for the RECK-GPR124 complex not determined\", \"Whether RECK-GPR124 modulates WNT7B signaling amplitude or simply enables it is unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Non-canonical WNT7B signaling through Frizzled-7 via CaMKII and JNK was shown to promote dendritic arborization in hippocampal neurons, and WNT7B-driven osteogenesis was found to require Glut1-dependent glucose metabolism, expanding the repertoire of non-canonical effectors and metabolic mediators downstream of WNT7B.\",\n      \"evidence\": \"Fz7 loss-of-function in hippocampus with CaMKII/JNK phosphorylation assays; compound Wnt7b overexpression + Glut1 conditional KO in bone with glucose consumption measurements\",\n      \"pmids\": [\"29898920\", \"30913395\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How WNT7B-Fz7 selectively activates CaMKII/JNK rather than β-catenin in neurons is not understood\", \"Whether glucose metabolism is a general feature of WNT7B signaling beyond bone is untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"WNT7B was found to activate a β-catenin-independent Ca²⁺/Nfatc1 pathway to induce Sox11, driving both self-renewal and osteogenic differentiation of bone marrow stem cells, and separately to promote pancreatic progenitor proliferation through non-canonical PKC signaling rather than canonical Wnt.\",\n      \"evidence\": \"ChIP-qPCR for Nfatc1 at the Sox11 promoter with RNA-seq and shRNA validation; siRNA screening and Wnt-expressing feeder cell lines with canonical reporter analysis in pancreatic progenitors\",\n      \"pmids\": [\"32346881\", \"33125912\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the Ca²⁺/Nfatc1/Sox11 axis operates in other WNT7B-responsive cell types is unknown\", \"The specific Frizzled receptor(s) transducing non-canonical PKC signaling in pancreas not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Epigenetic regulation of WNT7B transcription was established: the lncRNA Lnc-Rewind recruits the G9a methyltransferase to deposit H3K9me2 at the Wnt7b locus in muscle stem cells, repressing its expression to control proliferation.\",\n      \"evidence\": \"RNA-protein co-IP (Lnc-Rewind/G9a), ChIP for H3K9me2 at Wnt7b locus, and in situ proximity assays in muscle stem cells\",\n      \"pmids\": [\"33432928\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether G9a-mediated repression of WNT7B operates in other stem cell populations is unknown\", \"Functional consequences of WNT7B derepression in muscle stem cells not fully characterized in vivo\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The RECK-GPR124 co-activator requirement was extended beyond CNS vasculature to limb development, and biallelic WNT7B loss-of-function was shown to cause PDAC syndrome in humans (pulmonary hypoplasia, diaphragmatic anomalies, anophthalmia, cardiac defects), validated by signaling assays and zebrafish models.\",\n      \"evidence\": \"Combinatorial mouse KOs for Wnt7a/7b/Gpr124/Reck in limb; human exome sequencing with canonical Wnt reporter validation of variants and wnt7bb zebrafish mutant analysis\",\n      \"pmids\": [\"35552394\", \"35790350\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full phenotypic spectrum of human WNT7B deficiency across additional families not established\", \"Whether RECK-GPR124 dependence applies in all WNT7B developmental contexts beyond CNS and limb is untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"WNT7B was shown to cooperate with WNT5A to regulate cochlear planar cell polarity through non-canonical signaling, activating PI3K/AKT and ERK via membrane recruitment of Daple (a Gαi GEF) to drive asymmetric Fzd6 localization, and WNT7B-FZD4 binding was validated by co-IP in periodontal ligament stem cells.\",\n      \"evidence\": \"Conditional Wnt5a/Wnt7b double KO in cochlea with Daple membrane recruitment and PI3K/AKT/ERK pathway analysis; co-IP of WNT7B-FZD4 with siRNA rescue in PDLSCs\",\n      \"pmids\": [\"39172791\", \"39301638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How WNT7B and WNT5A partition or synergize in activating Daple-dependent versus other PCP effectors is unclear\", \"Whether Daple recruitment is a general mechanism for WNT7B non-canonical signaling beyond cochlea is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for WNT7B receptor selectivity (canonical vs. non-canonical) and the determinants that specify which Frizzled receptor and downstream pathway are engaged in a given cell type remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of WNT7B in complex with any Frizzled receptor\", \"Molecular basis for tissue-specific pathway selection (canonical vs. JNK vs. PKC vs. PI3K/AKT) not resolved\", \"Whether post-translational modifications of WNT7B itself alter receptor specificity is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 4, 5, 6, 8, 12, 14, 15, 29]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1, 8, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1, 4, 5, 6, 12, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 4, 5, 6, 7, 8, 11, 12, 14, 15, 23, 24, 27, 29]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 3, 4, 6, 22, 28, 29, 33]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [11, 12, 13, 25, 26]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [3, 17]}\n    ],\n    \"complexes\": [\n      \"WNT7B-FZD-LRP5/6-RECK-GPR124 signaling complex\"\n    ],\n    \"partners\": [\n      \"FZD1\",\n      \"FZD10\",\n      \"FZD4\",\n      \"FZD7\",\n      \"LRP5\",\n      \"RECK\",\n      \"GPR124\",\n      \"FZD5\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}