{"gene":"WNT7A","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1995,"finding":"Wnt-7a expressed in dorsal limb ectoderm acts as a dorsalizing signal for limb mesoderm; mice lacking Wnt-7a show dorsal-to-ventral transformations of cell fate in the distal limb and also lack posterior digits, demonstrating roles in both dorsal-ventral and anterior-posterior patterning.","method":"Loss-of-function mouse knockout; morphological and histological analysis of limb phenotypes","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with specific and replicated phenotypic readouts, foundational study, independently corroborated by multiple subsequent papers","pmids":["7885472"],"is_preprint":false},{"year":1995,"finding":"Ectopic expression of Wnt7a in chick limb mesenchyme is sufficient to induce and maintain expression of the LIM homeodomain transcription factor LMX1 in dorsal limb mesenchyme; ectopic Lmx1 in ventral mesenchyme generates double-dorsal limbs, placing Wnt7a upstream of Lmx1 in the dorsoventral patterning cascade.","method":"Retroviral misexpression in chick limb bud in vivo and in vitro; genetic epistasis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — ectopic gain-of-function plus downstream epistasis, replicated across labs","pmids":["7585966"],"is_preprint":false},{"year":1995,"finding":"Wnt7a expressed in the dorsal ectoderm provides the signal required to maintain Shh expression in the posterior mesenchyme; removal of dorsal ectoderm causes loss of posterior skeletal elements rescued by exogenous SHH, demonstrating cross-talk between the dorsoventral (Wnt7a) and anteroposterior (Shh) signaling axes.","method":"Ectoderm removal surgery in chick limb bud; exogenous Shh rescue experiments","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue ablation with defined rescue, independently supported by Parr & McMahon 1995","pmids":["7697724"],"is_preprint":false},{"year":1997,"finding":"WNT-7a increases axonal spreading and branching in cultured cerebellar granule cells and elevates levels of the presynaptic protein synapsin I; lithium mimics these effects by inhibiting GSK-3β, placing WNT-7a signaling upstream of GSK-3β inhibition in axonal remodeling.","method":"Primary granule cell culture treatment with WNT-7a protein; lithium treatment as GSK-3β inhibitor; immunofluorescence for synapsin I","journal":"Developmental Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein treatment with specific cellular readouts, mechanistic pathway placement via pharmacological epistasis, replicated in subsequent papers","pmids":["9405095"],"is_preprint":false},{"year":1997,"finding":"En-1 expressed in ventral ectoderm represses Wnt-7a, and Wnt-7a is required for Lmx-1b expression in distal limb mesenchyme; ectopic Wnt-7a in ventral ectoderm of En-1 mutants activates Lmx-1b in ventral mesenchyme and induces a second AER, demonstrating a genetic hierarchy: En-1 represses Wnt-7a which induces Lmx-1b for dorsal specification.","method":"Double-mutant mouse analysis (En-1–/–; Wnt-7a–/–); in situ hybridization; retroviral misexpression in chick","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in double mutants with multiple molecular readouts","pmids":["9362463"],"is_preprint":false},{"year":1998,"finding":"WNT-7a inhibits GSK-3β activity in cerebellar neurons, leading to loss of the phosphorylated (GSK-3β-dependent) form of microtubule-associated protein MAP-1B from axons and growth cones before morphological remodeling is evident; in vitro phosphorylation assay confirms MAP-1B is a direct GSK-3β substrate.","method":"In vitro kinase phosphorylation assay; cerebellar neuron cultures treated with WNT-7a or lithium; immunofluorescence for MAP-1B-P","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay establishing direct substrate relationship, plus cell-based confirmation; single lab but multiple orthogonal methods","pmids":["9570753"],"is_preprint":false},{"year":1998,"finding":"Wnt-7a is required for maintenance of Müllerian duct patterning in both sexes: male Wnt-7a knockout mice fail to undergo Müllerian duct regression due to absence of the MIS receptor (MISR2/AMHR2); female mutants develop abnormal oviducts and uteri. Wnt-7a is required for expression of the MIS receptor in Müllerian duct mesenchyme.","method":"Wnt-7a knockout mouse analysis; histology; in situ hybridization for MISR2 expression","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined molecular mechanism (loss of receptor expression), replicated in subsequent reproductive tract studies","pmids":["9790192"],"is_preprint":false},{"year":1998,"finding":"Wnt-7a signaling from uterine epithelium is required for maintenance of Hoxa-10 and Hoxa-11 expression in postnatal uterus; Wnt-7a mutant mice show posterior shifts in oviduct/uterine identity and disorganized uterine smooth muscle, indicating Wnt-7a maintains anteroposterior and radial patterning of the female reproductive tract.","method":"Wnt-7a knockout mouse; in situ hybridization; histology","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with specific molecular readout (Hox gene expression), replicated in subsequent studies","pmids":["9671592"],"is_preprint":false},{"year":2000,"finding":"Granule cell-secreted WNT-7a induces axon and growth cone remodeling in mossy fibers and clustering of synapsin I; this effect is blocked by the WNT antagonist sFRP-1; Wnt-7a mutant mice show delayed morphological maturation of glomerular rosettes and delayed synapsin I accumulation, establishing WNT-7a as a synaptogenic factor.","method":"Conditioned medium and recombinant WNT-7a treatment of mossy fiber neurons; sFRP-1 antagonist blockade; Wnt-7a knockout mouse cerebellar analysis; immunofluorescence","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — recombinant protein gain-of-function plus knockout loss-of-function with specific synaptic phenotypes, high-impact journal","pmids":["10721990"],"is_preprint":false},{"year":2003,"finding":"WNT7A signals through a Frizzled-5/LRP6 receptor complex in PC12 cells to stabilize β-catenin and activate TCF-based transcription; this activity is antagonized by Dickkopf-1 and Dickkopf-3.","method":"Functional reporter assays (TCF-luciferase) in PC12 cells; receptor overexpression; treatment with Dickkopf proteins","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter assay plus pharmacological antagonism; single lab, PC12 cell line model","pmids":["12857724"],"is_preprint":false},{"year":2003,"finding":"WNT7a activates E-cadherin expression in lung cancer cells via a β-catenin-specific mechanism; WNT7a increases free β-catenin levels and E-cadherin; ZEB1 transcriptional repressor uniquely correlates with E-cadherin loss; a positive feedback loop involving WNT7a and E-cadherin exists.","method":"Recombinant WNT7a treatment of lung cancer cells; GSK-3β inhibitor (Li+) treatment; RNA interference of ZEB1; Western blot and reporter assays","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches (protein treatment, RNAi, pharmacology) in cell lines; single lab","pmids":["12937339"],"is_preprint":false},{"year":2004,"finding":"Wnt-7a induces dedifferentiation of primary articular chondrocytes by stimulating β-catenin transcriptional activity; separately, Wnt-7a inhibits NO-induced apoptosis via activation of PI3K and Akt, demonstrating two distinct downstream pathways for Wnt-7a in chondrocytes.","method":"Primary chondrocyte cultures; β-catenin reporter assay; PI3K/Akt pathway inhibitors; apoptosis assays","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two distinct pathways identified with specific inhibitors; single lab, primary cell culture","pmids":["15082716"],"is_preprint":false},{"year":2005,"finding":"WNT-7a acting through the Frizzled-9 receptor in non-small cell lung cancer cells reverses cellular transformation and induces epithelial differentiation; WNT-7a is present in Fzd-9 immunoprecipitates (direct interaction); WNT-7a/Fzd-9 activates the JNK pathway and induces E-cadherin and Sprouty-4 expression without activating β-catenin/TCF signaling.","method":"Co-immunoprecipitation; transfection of Fzd-9 into WNT-7a-insensitive cells; soft agar and 3D culture assays; JNK pathway reporter; Western blot","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding demonstrated by Co-IP, non-canonical pathway activation confirmed, single lab","pmids":["15705594"],"is_preprint":false},{"year":2005,"finding":"Wnt-7a rapidly induces accumulation of β-catenin and activation of Rac GTPase in corneal epithelial cells; Wnt-7a and Rac synergistically induce MMP-12 transcription, promoting cell proliferation and wound closure; blocking MMP-12 delays Wnt-7a-induced wound closure.","method":"Corneal epithelial cell culture treatment with Wnt-7a; β-catenin and Rac activation assays; MMP-12 function-blocking; wound closure assay","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein treatment with mechanistic follow-up (Rac activation, MMP-12 blocking rescue); single lab","pmids":["15802269"],"is_preprint":false},{"year":2005,"finding":"Genetic epistasis in mice shows that reducing Dkk1 (a canonical Wnt antagonist) in Wnt7a-null mice prevents digit loss, indicating Wnt7a acts through the canonical Wnt/β-catenin pathway during limb development.","method":"Double and triple mutant mouse analysis (Dkk1 hypomorph × Wnt7a null × En1 null); limb skeletal analysis","journal":"Developmental Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple alleles in mice; specific skeletal phenotype rescue demonstrates pathway placement","pmids":["15242796"],"is_preprint":false},{"year":2005,"finding":"Wnt7a acts through Lrp6 co-receptor to regulate Lmx1b expression during dorsal limb specification; Lrp6-null mice lack Lmx1b expression phenocopying Wnt7a mutants, and Wnt7a–/–;Lrp6+/– double mutants show severely increased loss of posterior skeletal elements, consistent with Wnt7a signaling through the canonical Lrp6/β-catenin pathway.","method":"Lrp6 knockout and Wnt7a/Lrp6 double-mutant mouse analysis; in situ hybridization for Lmx1b; skeletal preparation","journal":"Developmental Dynamics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in double-mutant mice with defined molecular readout (Lmx1b expression)","pmids":["15880584"],"is_preprint":false},{"year":2006,"finding":"WNT-7a/Fzd-9 signaling in NSCLC cells activates ERK5, which in turn activates PPARγ; PPARγ inhibition blocks WNT-7a/Fzd-9-mediated suppression of anchorage-independent growth and E-cadherin induction, establishing an ERK5-PPARγ effector pathway downstream of WNT-7a/Fzd-9.","method":"ERK5 activation assays; PPARγ reporter assay; PPARγ inhibitor (SR202) treatment; soft agar growth assays in NSCLC cells","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition of multiple pathway nodes, specific functional readout; single lab","pmids":["16835228"],"is_preprint":false},{"year":2008,"finding":"Wnt7a co-immunoprecipitates with Fzd5, Fzd10, and SFRP4 in Ishikawa endometrial cancer cells; Wnt7a binding to Fzd5 activates β-catenin/canonical signaling and increases proliferation, whereas Wnt7a binding to Fzd10 induces non-canonical JNK signaling; SFRP4 suppresses both pathways.","method":"Co-immunoprecipitation; β-catenin reporter assay; JNK pathway assay; SFRP4 overexpression; cell proliferation assay","journal":"Molecular Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with multiple receptors, pathway-specific reporter assays; single lab","pmids":["18567805"],"is_preprint":false},{"year":2008,"finding":"Purified Wnt7a binds to the extracellular cysteine-rich domain of Fzd5 with nanomolar affinity as measured by ELISA-based binding assay; a split eGFP complementation assay visually confirms Wnt7a-Fzd5 interaction in cells.","method":"ELISA-based protein-protein binding assay; split eGFP complementation assay in cells","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct in vitro binding assay with quantified affinity plus cell-based confirmation; single lab","pmids":["18230341"],"is_preprint":false},{"year":2009,"finding":"Wnt7a signals through Frizzled-7 (Fzd7) on satellite cells to drive symmetric expansion of satellite stem cells via the planar cell polarity (PCP) pathway; Wnt7a induces polarized distribution of the PCP effector Vangl2; silencing Fzd7 abrogates Wnt7a binding and stem cell expansion; silencing Vangl2 inhibits Wnt7a action; Wnt7a overexpression increases satellite stem cell numbers and muscle regeneration.","method":"Satellite cell isolation and culture; Fzd7 and Vangl2 siRNA knockdown; Wnt7a binding assay; in vivo overexpression; immunofluorescence for Vangl2 polarity","journal":"Cell Stem Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — receptor identification by binding/knockdown, pathway effector (Vangl2) epistasis, in vivo validation; single lab but multiple orthogonal methods","pmids":["19497282"],"is_preprint":false},{"year":2010,"finding":"Frizzled-5 (Fz5) mediates the synaptogenic effect of Wnt7a in hippocampal neurons; Fz5 is present in synaptosomes and co-localizes with synaptic markers; Fz5 knockdown or soluble Fz5-CRD domain blocks Wnt7a-stimulated synaptogenesis; neuronal activity recruits Fz5 to synapses in an endogenous Wnt-dependent manner.","method":"Synaptosome fractionation; Fz5 shRNA knockdown; soluble Fz5-CRD domain inhibition; high-frequency stimulation; immunofluorescence; electrophysiology","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — receptor identification by multiple methods (knockdown, dominant-negative CRD, localization), in vitro and activity-dependent contexts","pmids":["20530549"],"is_preprint":false},{"year":2011,"finding":"Wnt7a signaling through Fzd7 activates the Akt/mTOR anabolic growth pathway in differentiated myofibers, inducing hypertrophy; the Fzd7 receptor complex associates with Gαs and PI3K, which are required for Wnt7a-mediated Akt/mTOR activation; this pathway is completely independent of IGF-receptor activation.","method":"Co-immunoprecipitation of Fzd7 with Gαs and PI3K; genetic loss-of-function with siRNA; myofibre hypertrophy measurements; Akt/mTOR phosphorylation assays","journal":"Nature Cell Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP identifies complex components, pathway independence from IGF-R confirmed, multiple assays; single lab","pmids":["22179044"],"is_preprint":false},{"year":2011,"finding":"Wnt7a preferentially stimulates excitatory synapse formation in hippocampal neurons; postsynaptic Dishevelled-1 (Dvl1) expression mediates increased mEPSC frequency and amplitude; Wnt7a-Dvl1 deficient mice have defects in spine morphogenesis and mossy fiber-CA3 synaptic transmission; Wnt7a rapidly activates CaMKII in dendritic spines, and CaMKII inhibition abolishes Wnt7a effects on spine growth and excitatory synaptic strength.","method":"Electrophysiology (mEPSC/mIPSC recording); Dvl1 overexpression; Wnt7a-Dvl1 double knockout mouse; CaMKII activity reporter; pharmacological CaMKII inhibition; spine morphometry","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double knockout, pharmacological epistasis, electrophysiology, live cell kinase reporter; multiple methods","pmids":["21670302"],"is_preprint":false},{"year":2012,"finding":"WNT7A signals through FZD5 receptor and β-catenin/TCF pathway in ovarian cancer cells; co-transfection with FZD5 amplifies WNT7A-activated TCF/LEF reporter; WNT7A activates MMP7 promoter through TCF-binding sites; WNT7A knockdown reduces invasion and tumor lesions in vivo.","method":"TCF/LEF luciferase reporter; FZD5 co-transfection; MMP7 promoter mutation analysis; siRNA knockdown; xenograft mouse model","journal":"Molecular Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter mutation identifies specific TCF binding sites, receptor co-transfection epistasis, in vivo xenograft; single lab","pmids":["22232518"],"is_preprint":false},{"year":2013,"finding":"Fibronectin (FN) binds Syndecan-4 (Sdc4) to stimulate Wnt7a-induced satellite stem cell expansion; Sdc4 and Fzd7 form a co-receptor complex; newly activated satellite cells transiently upregulate FN to remodel their niche; FN knockdown impairs satellite cell niche repopulation; co-overexpression of FN with Wnt7a dramatically stimulates stem cell expansion in vivo.","method":"Co-immunoprecipitation of Sdc4/Fzd7; siRNA knockdown of FN, Sdc4, Fzd7; in vivo overexpression; satellite cell transplantation assays","journal":"Cell Stem Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP identifies co-receptor complex, multiple loss- and gain-of-function experiments in vitro and in vivo; single lab but highly rigorous","pmids":["23290138"],"is_preprint":false},{"year":2013,"finding":"A truncated C-terminal Wnt7a variant (137 amino acids) lacking conserved palmitoylation sites retains full biological activity: it binds Fzd7, activates PCP-mediated satellite stem cell symmetric expansion and AKT/mTOR-mediated myofibre hypertrophy, and shows enhanced secretion and dispersion compared to full-length Wnt7a.","method":"Truncated protein generation; Fzd7 binding assay; satellite cell expansion assay; myofibre hypertrophy measurement; AKT/mTOR phosphorylation; secretion/dispersion assays","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — biochemical binding, cell-based functional assays with multiple pathway readouts; single lab but multiple orthogonal methods","pmids":["24287629"],"is_preprint":false},{"year":2013,"finding":"Wnt7a activates β-catenin/cyclin D1 pathway to stimulate neural stem cell proliferation and β-catenin/neurogenin-2 pathway to promote neuronal differentiation in the hippocampal dentate gyrus; Wnt7a-null mice show reduced neural stem cell population, increased cell cycle exit, and decreased newborn neurons with impaired dendritic development.","method":"Wnt7a knockout mouse; BrdU labeling; β-catenin reporter; immunofluorescence; neurosphere assay","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout with multiple molecular pathway readouts; pathway bifurcation established","pmids":["23629626"],"is_preprint":false},{"year":2014,"finding":"Wnt7a/Fzd7 signaling increases the polarity and directional migration of satellite cells through activation of Dvl2 and the small GTPase Rac1; Wnt7a treatment improves tissue dispersal and engraftment of transplanted myogenic cells, enhancing muscle function.","method":"siRNA knockdown of Dvl2 and Rac1; directional migration assay; satellite cell transplantation into dystrophic muscle; functional muscle force measurements","journal":"Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic pathway dissection via siRNA epistasis, functional in vivo transplantation readout; single lab, multiple methods","pmids":["24711502"],"is_preprint":false},{"year":2014,"finding":"WNT7A/β-catenin signaling directly regulates FGF1 expression via TCF binding elements in the FGF1-1C promoter; chromatin immunoprecipitation (ChIP) demonstrates β-catenin binding to this locus; FGF1 is sufficient to drive WNT7A tumor-promoting effects in ovarian cancer.","method":"ChIP assay; TCF-binding site mutation in FGF1 promoter reporter; FGF1 knockdown in WNT7A-overexpressing cells; xenograft mouse model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP identifies direct transcriptional target, promoter mutation confirms mechanism, in vivo xenograft; single lab but rigorous","pmids":["25174399"],"is_preprint":false},{"year":2014,"finding":"WNT7A controls corneal epithelium differentiation through PAX6; loss of WNT7A or PAX6 redirects limbal stem cells toward a skin-like epithelial fate; WNT7A acts upstream of PAX6 in determining corneal epithelial cell fate.","method":"In vitro LSC expansion and 3D corneal differentiation; WNT7A and PAX6 loss-of-function; PAX6 transduction into skin epithelial stem cells; rabbit corneal transplantation model","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (WNT7A upstream of PAX6), gain-of-function rescue in vivo, multiple orthogonal methods","pmids":["25030175"],"is_preprint":false},{"year":2015,"finding":"Wnt7a induces cellular senescence independently of β-catenin and independently of the classical p16(INK4a)/p19(ARF) oncogene-induced senescence pathway; mechanistically, Wnt7a induces senescence via inactivation of SKP2 (S-phase kinase-associated protein 2); Wnt7a-null mice exhibit increased lung tumorigenesis with reduced senescence markers.","method":"Wnt7a-null mouse model (two strains); senescence marker analysis; SKP2 expression assays; carcinogen-induced tumorigenesis model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockout model with pathway dissection (β-catenin independence, SKP2 identification); single lab","pmids":["25728679"],"is_preprint":false},{"year":2016,"finding":"Wnt7a secreted by aggressive breast tumor cells induces cancer-associated fibroblast (CAF) conversion and promotes ECM remodeling and metastasis; mechanistically, Wnt7a-mediated fibroblast activation potentiates TGFβ receptor signaling independently of classical Wnt signaling.","method":"In vivo mouse tumor models; 3D in vitro co-culture; TGFβ signaling assays; Wnt7a-specific inhibition","journal":"Nature Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro models with pathway mechanistic dissection; single lab","pmids":["26777421"],"is_preprint":false},{"year":2017,"finding":"Reck and Gpr124 are required co-receptors for Wnt7a/Wnt7b-specific signaling in CNS vascular endothelial cells; the N-terminal domain of Reck binds the LRR and Ig domains of Gpr124; soluble probes confirm that Reck and Gpr124 are part of a cell-surface complex with Frizzled, Wnt7a/Wnt7b; targeted mutagenesis of the Reck-Gpr124 interaction reduces Wnt7a signaling and impairs CNS angiogenesis.","method":"Vascular EC-specific Reck knockout; targeted mutagenesis of Reck-Gpr124 interaction; soluble probe binding assays; cell culture Wnt7a signaling assays; in vivo CNS angiogenesis analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mutagenesis identifies critical domain interface, soluble probe confirms complex assembly, in vivo genetic validation; multiple orthogonal methods","pmids":["28803732"],"is_preprint":false},{"year":2018,"finding":"Wnt7a and Norrin/Fz4 systems show threshold effects and partial redundancy in maintaining the blood-brain barrier (BBB) and blood-retina barrier; combined loss of Wnt7a and Norrin, or Wnt7a and Fz4, produces far more severe BBB defects than individual losses; glia are the source of Wnt7a in the cerebellum for BBB maintenance.","method":"Conditional knockout mouse models (cell-type-specific); combinatorial genetic analysis; BBB permeability assays","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple conditional genetic combinations defining redundancy and pathway components in vivo","pmids":["30478038"],"is_preprint":false},{"year":2019,"finding":"Two clusters of amino acids in Wnt7a (one at the N-terminus, one in a protruding loop) that distinguish Wnt7a/7b from other Wnts are essential for Reck/Gpr124-dependent signaling; within Reck, the fourth CC domain (CC4), specifically residues P256 and W261, is essential for Wnt7a stimulation without altering protein abundance or surface localization.","method":"Site-directed mutagenesis of Wnt7a and Reck; cell culture Wnt7a signaling assays; mouse embryo analysis of Reck CC4 mutants","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis at specific residues with in vitro and in vivo validation; single lab but rigorous mechanistic dissection","pmids":["31225798"],"is_preprint":false},{"year":2019,"finding":"Wnt7a promotes VEGF signaling in pulmonary microvascular endothelial cells by facilitating Y1175 tyrosine phosphorylation in VEGFR2 through the Wnt-specific receptor ROR2; ROR2 knockdown mimics Wnt7a insufficiency and prevents recovery of tip cell formation.","method":"Recombinant Wnt7a treatment of PMVECs; ROR2 siRNA knockdown; VEGFR2 Y1175 phosphorylation assay; filopodia/tip cell formation assay; Wnt7a-/- mouse","journal":"European Respiratory Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation site identified, receptor epistasis via knockdown; single lab, cell culture and mouse model","pmids":["37024132"],"is_preprint":false},{"year":2020,"finding":"WNT7A inhibits adipogenesis of fibro-adipogenic progenitors (FAPs) by inducing nuclear localization of YAP through Rho GTPase in a β-catenin-independent manner and by promoting nuclear retention of YAP and TAZ in differentiating FAPs; intramuscular WNT7A injection in vivo suppresses fatty infiltration.","method":"FAP cell culture; YAP/TAZ localization by immunofluorescence; Rho inhibition; β-catenin knockdown; in vivo intramuscular injection; glycerol injury model","journal":"Stem Cell Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific pathway components identified (Rho-YAP/TAZ), β-catenin independence confirmed, in vivo validation; single lab","pmids":["37001514"],"is_preprint":false},{"year":2022,"finding":"In zebrafish, Gpr124 facilitates delivery of Reck-bound Wnt7a/b to Frizzled via intracellular scaffolding mechanisms: an internal Dvl-binding motif and a C-terminal ETTV motif recruiting Dlg4 and Magi3 mediate Gpr124-Frizzled interactions; mammalian Gpr124 uses an ICD-independent mechanism involving transmembrane and extracellular domains instead.","method":"Zebrafish genetic and molecular analysis; domain deletion and mutagenesis; co-immunoprecipitation of Dvl, Dlg4, Magi3; comparison of zebrafish vs. mouse/human Gpr124","journal":"Cell Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic domain dissection across species; zebrafish model with biochemical validation; single study","pmids":["35649360"],"is_preprint":false},{"year":2007,"finding":"Wnt-7a induces dissociation of the APC protein from the β-catenin cytoplasmic complex, promotes APC relocalization to membranes and clustering in neurites, and induces co-clustering of APC with α7-nicotinic acetylcholine receptors (α7-nAChRs) at presynaptic terminals in hippocampal neurons; APC serves as an intermediary for α7-nAChR presynaptic relocalization.","method":"Hippocampal neuron treatment with Wnt-7a; co-immunoprecipitation; immunofluorescence colocalization; receptor clustering assays","journal":"Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrates complex disruption, immunofluorescence shows relocalization; single lab","pmids":["17507554"],"is_preprint":false},{"year":2023,"finding":"Basal cell-derived WNT7A activates fibroblasts at the fibrotic niche in idiopathic pulmonary fibrosis; WNT7A inhibits AEC2 progenitor cell renewal in 3D organoid cultures; neutralizing antibodies against WNT7A or Frizzled signaling inhibitors abolish basal cell-induced fibroblast activation and attenuate lung fibrosis in a repetitive bleomycin mouse model.","method":"3D organoid cultures; conditioned medium experiments; neutralizing antibodies; small molecule Frizzled inhibitor; repetitive bleomycin in vivo model; single-cell RNA sequencing","journal":"American Journal of Respiratory Cell and Molecular Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays in vitro and in vivo with specific inhibitor rescue; single lab","pmids":["36318668"],"is_preprint":false},{"year":2018,"finding":"Wnt-7a stimulates dendritic spine morphogenesis in hippocampal neurons via GSK-3β inhibition, triggering β-catenin/TCF/LEF-dependent transcription and promoting PSD-95 expression; β-catenin/TCF/LEF inhibitor treatment of wild-type mice reduces spatial memory, spine density, and PSD-95 levels.","method":"Wnt-7a protein treatment of hippocampal neurons; GSK-3β and β-catenin inhibitors; Golgi staining of spine density; spatial memory behavioral testing in mice","journal":"Molecular Neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological pathway dissection with in vitro and in vivo readouts; single lab","pmids":["29967987"],"is_preprint":false},{"year":2024,"finding":"SARS-CoV-2 infection suppresses Wnt/β-catenin signaling in brain endothelial cells; delivery of engineered cerebrovascular-targeted Wnt7a ligands protects BBB integrity, reduces T-cell brain infiltration, reduces microglial activation, and mitigates cognitive deficits in a mouse COVID-19 model.","method":"Transcriptional analysis of brain endothelial cells in vivo; engineered Wnt7a ligand delivery; BBB permeability assay; T-cell infiltration quantification; behavioral assays (novel object recognition, pole descent)","journal":"Brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with engineered ligand in vivo with multiple orthogonal readouts; single study","pmids":["38306655"],"is_preprint":false}],"current_model":"WNT7A is a secreted glycoprotein that signals through distinct Frizzled receptor complexes (Fzd5/LRP6, Fzd7/Sdc4, Fzd9) to activate context-dependent downstream pathways—including canonical β-catenin/TCF transcription, non-canonical planar cell polarity (PCP/Vangl2) driving satellite stem cell symmetric expansion, Akt/mTOR-mediated myofibre hypertrophy via a Gαs/PI3K-containing Fzd7 complex, JNK/ERK5/PPARγ signaling in lung epithelial and cancer cells, and GSK-3β inhibition leading to MAP-1B dephosphorylation and synaptic remodeling in neurons—with its CNS vascular specificity conferred by obligate co-receptors Reck (binding through CC4 domain) and Gpr124 that assemble a Wnt7a/Frizzled complex to regulate blood-brain barrier integrity and CNS angiogenesis."},"narrative":{"mechanistic_narrative":"WNT7A is a secreted glycoprotein morphogen that orchestrates tissue patterning, stem-cell behavior, and synaptic and vascular development by engaging distinct Frizzled receptor complexes that route signaling into both canonical β-catenin/TCF and several non-canonical effector pathways [PMID:7885472, PMID:12857724, PMID:19497282]. In development, dorsal-ectoderm WNT7A acts as a dorsalizing signal for limb mesoderm, operating upstream of the LIM homeodomain factor Lmx1b and maintaining posterior Shh expression, with genetic epistasis showing it signals through the LRP6/β-catenin axis antagonized by Dkk1 [PMID:7885472, PMID:7585966, PMID:7697724, PMID:15880584, PMID:15242796]; it likewise maintains Müllerian-duct and uterine patterning through control of the MIS receptor and Hox genes [PMID:9790192, PMID:9671592]. WNT7A drives satellite stem-cell symmetric expansion and directional migration through a Fzd7/Syndecan-4 co-receptor complex that activates the planar-cell-polarity effector Vangl2 and Dvl2/Rac1, and induces myofibre hypertrophy through a Fzd7–Gαs–PI3K complex activating Akt/mTOR independently of IGF signaling [PMID:19497282, PMID:23290138, PMID:24711502, PMID:22179044]. In neurons, WNT7A signaling through Fzd5 and Dishevelled inhibits GSK-3β—dephosphorylating MAP-1B—and activates CaMKII to promote axonal remodeling, excitatory synaptogenesis, and dendritic spine growth [PMID:9570753, PMID:20530549, PMID:21670302, PMID:10721990]. In CNS vasculature, WNT7A signaling requires the obligate co-receptors Reck and Gpr124, which assemble with Frizzled to maintain blood-brain barrier integrity and CNS angiogenesis; specific Wnt7a residues and the Reck CC4 domain mediate this interaction [PMID:28803732, PMID:31225798, PMID:30478038]. In epithelial and cancer contexts WNT7A engages Fzd5/Fzd9/Fzd10 to drive β-catenin/TCF transcription of targets such as FGF1 and MMP7, or non-canonical JNK/ERK5/PPARγ and TGFβ-potentiating programs, with context-dependent tumor-suppressive or tumor-promoting and fibroblast-activating effects [PMID:22232518, PMID:25174399, PMID:15705594, PMID:16835228, PMID:26777421].","teleology":[{"year":1995,"claim":"Established WNT7A's foundational developmental role: it was unknown what signal dorsalized the limb, and knockout/misexpression showed WNT7A is the dorsal-ectoderm cue acting upstream of Lmx1 and maintaining Shh.","evidence":"Loss-of-function mouse knockout and retroviral misexpression/ectoderm ablation in chick limb","pmids":["7885472","7585966","7697724"],"confidence":"High","gaps":["Receptor and co-receptor mediating limb signaling not yet identified","Signal transduction branch (canonical vs non-canonical) undefined at this stage"]},{"year":1997,"claim":"Placed WNT7A in a genetic hierarchy and revealed a neuronal signaling mechanism: En-1 represses Wnt-7a which induces Lmx-1b, while in neurons WNT7A acts upstream of GSK-3β inhibition to remodel axons.","evidence":"Double-mutant mouse genetics and primary cerebellar granule cell cultures with lithium epistasis","pmids":["9362463","9405095"],"confidence":"High","gaps":["Direct GSK-3β substrate in neurons not yet defined","Receptor mediating neuronal effect unknown"]},{"year":1998,"claim":"Identified a direct downstream substrate and broadened the physiological scope: WNT7A inhibition of GSK-3β removes phospho-MAP-1B, and WNT7A maintains reproductive-tract patterning via MIS-receptor and Hox gene control.","evidence":"In vitro kinase assay plus neuron cultures; Wnt-7a knockout mice with in situ hybridization","pmids":["9570753","9790192","9671592"],"confidence":"High","gaps":["How WNT7A reaches GSK-3β (receptor/Dvl link) not established","Mechanism of MIS-receptor induction in mesenchyme unknown"]},{"year":2000,"claim":"Demonstrated WNT7A is a bona fide synaptogenic factor: secreted WNT7A drives presynaptic differentiation and its loss delays synaptic maturation in vivo.","evidence":"Recombinant/conditioned-medium treatment, sFRP-1 blockade, and Wnt-7a knockout cerebellar analysis","pmids":["10721990"],"confidence":"High","gaps":["Receptor mediating synaptogenesis not yet identified","Postsynaptic effectors undefined"]},{"year":2003,"claim":"Began defining receptor specificity and pathway bifurcation: WNT7A activates β-catenin/TCF through a Fzd5/LRP6 complex and induces E-cadherin in epithelial cells, antagonized by Dickkopfs.","evidence":"TCF-luciferase reporter assays and recombinant WNT7A treatment in PC12 and lung cancer cells","pmids":["12857724","12937339"],"confidence":"Medium","gaps":["Direct Wnt7a-Fzd5 binding not yet demonstrated","Single-lab, cell-line dependent"]},{"year":2004,"claim":"Showed cell-type-dependent dual outputs: in chondrocytes WNT7A both drives β-catenin-dependent dedifferentiation and protects against apoptosis via PI3K/Akt.","evidence":"Primary chondrocyte cultures with β-catenin reporter and PI3K/Akt inhibitors","pmids":["15082716"],"confidence":"Medium","gaps":["Receptor mediating each branch unidentified","Mechanism linking WNT7A to PI3K not defined here"]},{"year":2005,"claim":"Resolved canonical-pathway involvement in limb development and uncovered a non-canonical Fzd9 branch: genetic Dkk1/Lrp6 epistasis confirmed canonical signaling in limb, while a direct WNT7A-Fzd9 interaction activates JNK without β-catenin in lung cancer.","evidence":"Triple-mutant mouse genetics; Co-IP and JNK reporter assays in NSCLC cells; corneal Rac/MMP-12 assays","pmids":["15242796","15880584","15705594","15802269"],"confidence":"High","gaps":["How a single ligand chooses canonical vs JNK output mechanistically unresolved","Fzd9 binding interface uncharacterized"]},{"year":2006,"claim":"Defined a non-canonical effector cascade: WNT7A/Fzd9 acts through ERK5 to activate PPARγ, suppressing transformed growth in lung cancer.","evidence":"ERK5 and PPARγ reporter assays with pharmacological inhibitors in NSCLC cells","pmids":["16835228"],"confidence":"Medium","gaps":["Link between Fzd9 and ERK5 activation undefined","Single lab, cell line"]},{"year":2008,"claim":"Provided biochemical receptor binding and multi-Frizzled branching: purified WNT7A binds the Fzd5 CRD with nanomolar affinity, and in endometrial cells Fzd5 routes canonical while Fzd10 routes JNK signaling, both suppressed by SFRP4.","evidence":"ELISA binding and split-eGFP assays; Co-IP and pathway-specific reporters in Ishikawa cells","pmids":["18230341","18567805"],"confidence":"Medium","gaps":["Structural basis of selective pathway engagement unresolved","In vivo relevance of Fzd10 branch untested"]},{"year":2009,"claim":"Established the satellite-cell stem-expansion mechanism: WNT7A signals through Fzd7 via the PCP pathway and the effector Vangl2 to drive symmetric stem-cell expansion and enhance regeneration.","evidence":"Satellite cell culture with Fzd7/Vangl2 siRNA, binding assays, and in vivo overexpression","pmids":["19497282"],"confidence":"High","gaps":["Co-receptor requirements not yet defined","Downstream cytoskeletal mechanism incomplete"]},{"year":2010,"claim":"Identified the synaptogenic receptor: Fzd5 mediates WNT7A-stimulated hippocampal synaptogenesis and is recruited to synapses in an activity-dependent manner.","evidence":"Synaptosome fractionation, Fz5 knockdown/dominant-negative CRD, and electrophysiology","pmids":["20530549"],"confidence":"High","gaps":["Postsynaptic transduction not fully resolved here","How activity recruits Fz5 mechanistically unknown"]},{"year":2011,"claim":"Defined two muscle/neuronal mechanisms: a Fzd7-Gαs-PI3K complex activates Akt/mTOR hypertrophy independently of IGF, and postsynaptic Dvl1/CaMKII mediates WNT7A excitatory-synapse formation.","evidence":"Co-IP of Fzd7 complex and myofibre assays; Wnt7a-Dvl1 double knockout, CaMKII reporter and electrophysiology","pmids":["22179044","21670302"],"confidence":"High","gaps":["How Fzd7 couples to Gαs not structurally defined","Connection between PCP and Akt/mTOR branches in muscle unresolved"]},{"year":2012,"claim":"Linked WNT7A to oncogenic transcriptional output: WNT7A/FZD5/β-catenin activates the MMP7 promoter through TCF sites and promotes ovarian cancer invasion.","evidence":"TCF/LEF reporter, MMP7 promoter mutagenesis, siRNA and xenografts","pmids":["22232518"],"confidence":"Medium","gaps":["Other direct target genes not mapped here","Single lab"]},{"year":2013,"claim":"Defined the satellite-cell niche co-receptor and ligand minimal unit: Fibronectin/Syndecan-4 partners with Fzd7, and a palmitoylation-site-lacking truncated WNT7A retains full PCP and Akt/mTOR activity with enhanced dispersion.","evidence":"Co-IP of Sdc4/Fzd7, niche FN knockdown/transplantation; truncated protein binding and functional assays","pmids":["23290138","24287629"],"confidence":"High","gaps":["Role of lipidation in receptor selectivity not fully resolved","Stoichiometry of Fzd7/Sdc4/FN complex undefined"]},{"year":2013,"claim":"Extended WNT7A to neural stem-cell control: β-catenin/cyclin D1 drives proliferation while β-catenin/neurogenin-2 promotes neuronal differentiation in the dentate gyrus.","evidence":"Wnt7a knockout mouse with BrdU labeling, β-catenin reporter and neurosphere assays","pmids":["23629626"],"confidence":"High","gaps":["Switch mechanism between proliferative and differentiative outputs unknown","Receptor identity in NSCs not defined"]},{"year":2014,"claim":"Expanded the regenerative and epithelial repertoire: WNT7A/Fzd7 drives Dvl2/Rac1 directional migration of satellite cells, transcriptionally controls FGF1 via β-catenin/TCF in cancer, and specifies corneal epithelial fate upstream of PAX6.","evidence":"siRNA epistasis and transplantation; ChIP and promoter mutagenesis; LSC differentiation with PAX6 rescue in vivo","pmids":["24711502","25174399","25030175"],"confidence":"High","gaps":["Receptor mediating corneal PAX6 control not specified","Crosstalk between migration and expansion branches unresolved"]},{"year":2015,"claim":"Uncovered a β-catenin-independent tumor-suppressive mechanism: WNT7A induces senescence via SKP2 inactivation, with loss increasing lung tumorigenesis.","evidence":"Two Wnt7a-null strains, senescence markers, SKP2 assays and carcinogen model","pmids":["25728679"],"confidence":"Medium","gaps":["Receptor and proximal signaling to SKP2 undefined","Single lab"]},{"year":2016,"claim":"Showed a stromal, β-catenin-independent oncogenic role: tumor-secreted WNT7A converts fibroblasts to CAFs and potentiates TGFβ signaling to drive metastasis.","evidence":"In vivo tumor models, 3D co-culture and TGFβ signaling assays","pmids":["26777421"],"confidence":"Medium","gaps":["Receptor on fibroblasts unidentified","Mechanism of TGFβ potentiation undefined"]},{"year":2017,"claim":"Defined CNS vascular specificity: Reck and Gpr124 are obligate co-receptors assembling a Wnt7a/Frizzled complex needed for BBB integrity and CNS angiogenesis, with the Reck N-terminus binding Gpr124 LRR/Ig domains.","evidence":"EC-specific Reck knockout, interface mutagenesis, soluble probes and in vivo angiogenesis","pmids":["28803732"],"confidence":"High","gaps":["Structural architecture of the full complex not resolved","How co-receptors confer ligand selectivity mechanistically incomplete"]},{"year":2018,"claim":"Mapped the molecular interface and a synaptic transcriptional arm: specific Wnt7a residue clusters and the Reck CC4 domain (P256/W261) are essential for CNS signaling, while neuronal GSK-3β/β-catenin/TCF drives PSD-95 and spine morphogenesis.","evidence":"Site-directed mutagenesis with in vivo validation; hippocampal neuron pharmacology and mouse behavior","pmids":["31225798","29967987"],"confidence":"High","gaps":["How CC4 residues contact Wnt7a structurally undefined","Relative contribution of transcriptional vs local signaling at synapses unresolved"]},{"year":2018,"claim":"Demonstrated co-receptor redundancy in barrier maintenance: Wnt7a and Norrin/Fz4 systems partially overlap, and glia supply WNT7A for cerebellar BBB maintenance.","evidence":"Combinatorial conditional knockout mice and BBB permeability assays","pmids":["30478038"],"confidence":"High","gaps":["Threshold integration mechanism between systems unknown","Endothelial responses to combined input undefined"]},{"year":2019,"claim":"Added a vascular receptor and effector: WNT7A acts through ROR2 to promote VEGFR2 Y1175 phosphorylation and tip-cell formation in pulmonary endothelium.","evidence":"Recombinant WNT7A, ROR2 siRNA, VEGFR2 phosphorylation and tip-cell assays plus Wnt7a-/- mice","pmids":["37024132"],"confidence":"Medium","gaps":["Mechanism linking ROR2 to VEGFR2 phosphorylation undefined","Single lab"]},{"year":2020,"claim":"Defined an anti-adipogenic mechanism: WNT7A drives nuclear YAP/TAZ retention through Rho GTPase, β-catenin-independently, to suppress FAP adipogenesis and fatty infiltration.","evidence":"FAP cultures with YAP/TAZ localization, Rho inhibition, β-catenin knockdown and in vivo injection","pmids":["37001514"],"confidence":"Medium","gaps":["Receptor coupling to Rho-YAP undefined","Single lab"]},{"year":2022,"claim":"Resolved species-divergent Gpr124 scaffolding: zebrafish Gpr124 uses intracellular Dvl-binding and ETTV/Dlg4/Magi3 motifs to deliver Reck-bound Wnt7a to Frizzled, while mammalian Gpr124 uses an ICD-independent mechanism.","evidence":"Zebrafish genetics, domain mutagenesis and Co-IP of Dvl/Dlg4/Magi3, cross-species comparison","pmids":["35649360"],"confidence":"Medium","gaps":["Mammalian ICD-independent mechanism not fully defined","Single study"]},{"year":2023,"claim":"Established WNT7A as a fibrotic driver: basal-cell-derived WNT7A activates fibroblasts and inhibits AEC2 renewal, with neutralizing antibodies attenuating lung fibrosis.","evidence":"3D organoids, conditioned medium, neutralizing antibodies/Frizzled inhibitor and bleomycin model with scRNA-seq","pmids":["36318668"],"confidence":"Medium","gaps":["Fibroblast receptor mediating activation unidentified","Single lab"]},{"year":2024,"claim":"Demonstrated therapeutic restoration of barrier signaling: SARS-CoV-2 suppresses endothelial Wnt/β-catenin, and engineered cerebrovascular-targeted Wnt7a ligands restore BBB integrity and reduce cognitive deficits.","evidence":"Engineered ligand delivery in a mouse COVID-19 model with BBB, immune and behavioral readouts","pmids":["38306655"],"confidence":"Medium","gaps":["Durability and dosing of engineered ligand undefined","Single study"]},{"year":null,"claim":"How a single ligand selects among canonical β-catenin, PCP/Vangl2, Akt/mTOR, JNK/ERK5, Rho-YAP, and Reck/Gpr124-gated outputs in a cell-type-specific manner remains the central unresolved question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying structural model of ligand-receptor-co-receptor pathway selection","Stoichiometry and assembly order of Fzd/co-receptor complexes undefined","Determinants of canonical vs non-canonical branch choice per tissue unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[18,19,25,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,9,32]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[8,25,39]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[18,32,24]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[9,19,21,32]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1,6,29]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[5,20,22,8]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[23,28,31,39]}],"complexes":["Wnt7a/Frizzled/Reck/Gpr124 CNS-vascular complex","Fzd7/Syndecan-4 co-receptor complex","Fzd7/Gαs/PI3K complex"],"partners":["FZD5","FZD7","FZD9","LRP6","RECK","GPR124","SDC4","ROR2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00755","full_name":"Protein Wnt-7a","aliases":[],"length_aa":349,"mass_kda":39.0,"function":"Ligand for members of the frizzled family of seven transmembrane receptors that functions in the canonical Wnt/beta-catenin signaling pathway (By similarity). Plays an important role in embryonic development, including dorsal versus ventral patterning during limb development, skeleton development and urogenital tract development (PubMed:16826533). Required for central nervous system (CNS) angiogenesis and blood-brain barrier regulation (PubMed:30026314). Required for normal, sexually dimorphic development of the Mullerian ducts, and for normal fertility in both sexes (By similarity). Required for normal neural stem cell proliferation in the hippocampus dentate gyrus (By similarity). Required for normal progress through the cell cycle in neural progenitor cells, for self-renewal of neural stem cells, and for normal neuronal differentiation and maturation (By similarity). Promotes formation of synapses via its interaction with FZD5 (By similarity)","subcellular_location":"Secreted, extracellular space, extracellular matrix; Secreted","url":"https://www.uniprot.org/uniprotkb/O00755/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WNT7A","classification":"Not Classified","n_dependent_lines":18,"n_total_lines":1208,"dependency_fraction":0.014900662251655629},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/WNT7A","total_profiled":1310},"omim":[{"mim_id":"616333","title":"WNT SIGNALING PATHWAY ACTIVATING NONCODING RNA; WSPAR","url":"https://www.omim.org/entry/616333"},{"mim_id":"613380","title":"H6 FAMILY HOMEOBOX 3; HMX3","url":"https://www.omim.org/entry/613380"},{"mim_id":"613005","title":"SANTOS SYNDROME","url":"https://www.omim.org/entry/613005"},{"mim_id":"604270","title":"LOW DENSITY LIPOPROTEIN RECEPTOR-RELATED PROTEIN 4; LRP4","url":"https://www.omim.org/entry/604270"},{"mim_id":"603490","title":"WINGLESS-TYPE MMTV INTEGRATION SITE FAMILY, MEMBER 4; WNT4","url":"https://www.omim.org/entry/603490"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":3.9},{"tissue":"gallbladder","ntpm":2.2},{"tissue":"placenta","ntpm":2.5}],"url":"https://www.proteinatlas.org/search/WNT7A"},"hgnc":{"alias_symbol":["Wnt-7a"],"prev_symbol":[]},"alphafold":{"accession":"O00755","domains":[{"cath_id":"-","chopping":"28-133_151-196_219-287","consensus_level":"high","plddt":92.1538,"start":28,"end":287},{"cath_id":"3.30.2460.20","chopping":"289-349","consensus_level":"medium","plddt":91.5974,"start":289,"end":349}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00755","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00755-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00755-F1-predicted_aligned_error_v6.png","plddt_mean":88.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WNT7A","jax_strain_url":"https://www.jax.org/strain/search?query=WNT7A"},"sequence":{"accession":"O00755","fasta_url":"https://rest.uniprot.org/uniprotkb/O00755.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00755/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00755"}},"corpus_meta":[{"pmid":"7885472","id":"PMC_7885472","title":"Dorsalizing 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mice lacking Wnt-7a show dorsal-to-ventral transformations of cell fate in the distal limb and also lack posterior digits, demonstrating roles in both dorsal-ventral and anterior-posterior patterning.\",\n      \"method\": \"Loss-of-function mouse knockout; morphological and histological analysis of limb phenotypes\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with specific and replicated phenotypic readouts, foundational study, independently corroborated by multiple subsequent papers\",\n      \"pmids\": [\"7885472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Ectopic expression of Wnt7a in chick limb mesenchyme is sufficient to induce and maintain expression of the LIM homeodomain transcription factor LMX1 in dorsal limb mesenchyme; ectopic Lmx1 in ventral mesenchyme generates double-dorsal limbs, placing Wnt7a upstream of Lmx1 in the dorsoventral patterning cascade.\",\n      \"method\": \"Retroviral misexpression in chick limb bud in vivo and in vitro; genetic epistasis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — ectopic gain-of-function plus downstream epistasis, replicated across labs\",\n      \"pmids\": [\"7585966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Wnt7a expressed in the dorsal ectoderm provides the signal required to maintain Shh expression in the posterior mesenchyme; removal of dorsal ectoderm causes loss of posterior skeletal elements rescued by exogenous SHH, demonstrating cross-talk between the dorsoventral (Wnt7a) and anteroposterior (Shh) signaling axes.\",\n      \"method\": \"Ectoderm removal surgery in chick limb bud; exogenous Shh rescue experiments\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue ablation with defined rescue, independently supported by Parr & McMahon 1995\",\n      \"pmids\": [\"7697724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"WNT-7a increases axonal spreading and branching in cultured cerebellar granule cells and elevates levels of the presynaptic protein synapsin I; lithium mimics these effects by inhibiting GSK-3β, placing WNT-7a signaling upstream of GSK-3β inhibition in axonal remodeling.\",\n      \"method\": \"Primary granule cell culture treatment with WNT-7a protein; lithium treatment as GSK-3β inhibitor; immunofluorescence for synapsin I\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein treatment with specific cellular readouts, mechanistic pathway placement via pharmacological epistasis, replicated in subsequent papers\",\n      \"pmids\": [\"9405095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"En-1 expressed in ventral ectoderm represses Wnt-7a, and Wnt-7a is required for Lmx-1b expression in distal limb mesenchyme; ectopic Wnt-7a in ventral ectoderm of En-1 mutants activates Lmx-1b in ventral mesenchyme and induces a second AER, demonstrating a genetic hierarchy: En-1 represses Wnt-7a which induces Lmx-1b for dorsal specification.\",\n      \"method\": \"Double-mutant mouse analysis (En-1–/–; Wnt-7a–/–); in situ hybridization; retroviral misexpression in chick\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in double mutants with multiple molecular readouts\",\n      \"pmids\": [\"9362463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"WNT-7a inhibits GSK-3β activity in cerebellar neurons, leading to loss of the phosphorylated (GSK-3β-dependent) form of microtubule-associated protein MAP-1B from axons and growth cones before morphological remodeling is evident; in vitro phosphorylation assay confirms MAP-1B is a direct GSK-3β substrate.\",\n      \"method\": \"In vitro kinase phosphorylation assay; cerebellar neuron cultures treated with WNT-7a or lithium; immunofluorescence for MAP-1B-P\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay establishing direct substrate relationship, plus cell-based confirmation; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"9570753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Wnt-7a is required for maintenance of Müllerian duct patterning in both sexes: male Wnt-7a knockout mice fail to undergo Müllerian duct regression due to absence of the MIS receptor (MISR2/AMHR2); female mutants develop abnormal oviducts and uteri. Wnt-7a is required for expression of the MIS receptor in Müllerian duct mesenchyme.\",\n      \"method\": \"Wnt-7a knockout mouse analysis; histology; in situ hybridization for MISR2 expression\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined molecular mechanism (loss of receptor expression), replicated in subsequent reproductive tract studies\",\n      \"pmids\": [\"9790192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Wnt-7a signaling from uterine epithelium is required for maintenance of Hoxa-10 and Hoxa-11 expression in postnatal uterus; Wnt-7a mutant mice show posterior shifts in oviduct/uterine identity and disorganized uterine smooth muscle, indicating Wnt-7a maintains anteroposterior and radial patterning of the female reproductive tract.\",\n      \"method\": \"Wnt-7a knockout mouse; in situ hybridization; histology\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with specific molecular readout (Hox gene expression), replicated in subsequent studies\",\n      \"pmids\": [\"9671592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Granule cell-secreted WNT-7a induces axon and growth cone remodeling in mossy fibers and clustering of synapsin I; this effect is blocked by the WNT antagonist sFRP-1; Wnt-7a mutant mice show delayed morphological maturation of glomerular rosettes and delayed synapsin I accumulation, establishing WNT-7a as a synaptogenic factor.\",\n      \"method\": \"Conditioned medium and recombinant WNT-7a treatment of mossy fiber neurons; sFRP-1 antagonist blockade; Wnt-7a knockout mouse cerebellar analysis; immunofluorescence\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — recombinant protein gain-of-function plus knockout loss-of-function with specific synaptic phenotypes, high-impact journal\",\n      \"pmids\": [\"10721990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"WNT7A signals through a Frizzled-5/LRP6 receptor complex in PC12 cells to stabilize β-catenin and activate TCF-based transcription; this activity is antagonized by Dickkopf-1 and Dickkopf-3.\",\n      \"method\": \"Functional reporter assays (TCF-luciferase) in PC12 cells; receptor overexpression; treatment with Dickkopf proteins\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter assay plus pharmacological antagonism; single lab, PC12 cell line model\",\n      \"pmids\": [\"12857724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"WNT7a activates E-cadherin expression in lung cancer cells via a β-catenin-specific mechanism; WNT7a increases free β-catenin levels and E-cadherin; ZEB1 transcriptional repressor uniquely correlates with E-cadherin loss; a positive feedback loop involving WNT7a and E-cadherin exists.\",\n      \"method\": \"Recombinant WNT7a treatment of lung cancer cells; GSK-3β inhibitor (Li+) treatment; RNA interference of ZEB1; Western blot and reporter assays\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches (protein treatment, RNAi, pharmacology) in cell lines; single lab\",\n      \"pmids\": [\"12937339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Wnt-7a induces dedifferentiation of primary articular chondrocytes by stimulating β-catenin transcriptional activity; separately, Wnt-7a inhibits NO-induced apoptosis via activation of PI3K and Akt, demonstrating two distinct downstream pathways for Wnt-7a in chondrocytes.\",\n      \"method\": \"Primary chondrocyte cultures; β-catenin reporter assay; PI3K/Akt pathway inhibitors; apoptosis assays\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two distinct pathways identified with specific inhibitors; single lab, primary cell culture\",\n      \"pmids\": [\"15082716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"WNT-7a acting through the Frizzled-9 receptor in non-small cell lung cancer cells reverses cellular transformation and induces epithelial differentiation; WNT-7a is present in Fzd-9 immunoprecipitates (direct interaction); WNT-7a/Fzd-9 activates the JNK pathway and induces E-cadherin and Sprouty-4 expression without activating β-catenin/TCF signaling.\",\n      \"method\": \"Co-immunoprecipitation; transfection of Fzd-9 into WNT-7a-insensitive cells; soft agar and 3D culture assays; JNK pathway reporter; Western blot\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding demonstrated by Co-IP, non-canonical pathway activation confirmed, single lab\",\n      \"pmids\": [\"15705594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Wnt-7a rapidly induces accumulation of β-catenin and activation of Rac GTPase in corneal epithelial cells; Wnt-7a and Rac synergistically induce MMP-12 transcription, promoting cell proliferation and wound closure; blocking MMP-12 delays Wnt-7a-induced wound closure.\",\n      \"method\": \"Corneal epithelial cell culture treatment with Wnt-7a; β-catenin and Rac activation assays; MMP-12 function-blocking; wound closure assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein treatment with mechanistic follow-up (Rac activation, MMP-12 blocking rescue); single lab\",\n      \"pmids\": [\"15802269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Genetic epistasis in mice shows that reducing Dkk1 (a canonical Wnt antagonist) in Wnt7a-null mice prevents digit loss, indicating Wnt7a acts through the canonical Wnt/β-catenin pathway during limb development.\",\n      \"method\": \"Double and triple mutant mouse analysis (Dkk1 hypomorph × Wnt7a null × En1 null); limb skeletal analysis\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple alleles in mice; specific skeletal phenotype rescue demonstrates pathway placement\",\n      \"pmids\": [\"15242796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Wnt7a acts through Lrp6 co-receptor to regulate Lmx1b expression during dorsal limb specification; Lrp6-null mice lack Lmx1b expression phenocopying Wnt7a mutants, and Wnt7a–/–;Lrp6+/– double mutants show severely increased loss of posterior skeletal elements, consistent with Wnt7a signaling through the canonical Lrp6/β-catenin pathway.\",\n      \"method\": \"Lrp6 knockout and Wnt7a/Lrp6 double-mutant mouse analysis; in situ hybridization for Lmx1b; skeletal preparation\",\n      \"journal\": \"Developmental Dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in double-mutant mice with defined molecular readout (Lmx1b expression)\",\n      \"pmids\": [\"15880584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"WNT-7a/Fzd-9 signaling in NSCLC cells activates ERK5, which in turn activates PPARγ; PPARγ inhibition blocks WNT-7a/Fzd-9-mediated suppression of anchorage-independent growth and E-cadherin induction, establishing an ERK5-PPARγ effector pathway downstream of WNT-7a/Fzd-9.\",\n      \"method\": \"ERK5 activation assays; PPARγ reporter assay; PPARγ inhibitor (SR202) treatment; soft agar growth assays in NSCLC cells\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition of multiple pathway nodes, specific functional readout; single lab\",\n      \"pmids\": [\"16835228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Wnt7a co-immunoprecipitates with Fzd5, Fzd10, and SFRP4 in Ishikawa endometrial cancer cells; Wnt7a binding to Fzd5 activates β-catenin/canonical signaling and increases proliferation, whereas Wnt7a binding to Fzd10 induces non-canonical JNK signaling; SFRP4 suppresses both pathways.\",\n      \"method\": \"Co-immunoprecipitation; β-catenin reporter assay; JNK pathway assay; SFRP4 overexpression; cell proliferation assay\",\n      \"journal\": \"Molecular Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with multiple receptors, pathway-specific reporter assays; single lab\",\n      \"pmids\": [\"18567805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Purified Wnt7a binds to the extracellular cysteine-rich domain of Fzd5 with nanomolar affinity as measured by ELISA-based binding assay; a split eGFP complementation assay visually confirms Wnt7a-Fzd5 interaction in cells.\",\n      \"method\": \"ELISA-based protein-protein binding assay; split eGFP complementation assay in cells\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro binding assay with quantified affinity plus cell-based confirmation; single lab\",\n      \"pmids\": [\"18230341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Wnt7a signals through Frizzled-7 (Fzd7) on satellite cells to drive symmetric expansion of satellite stem cells via the planar cell polarity (PCP) pathway; Wnt7a induces polarized distribution of the PCP effector Vangl2; silencing Fzd7 abrogates Wnt7a binding and stem cell expansion; silencing Vangl2 inhibits Wnt7a action; Wnt7a overexpression increases satellite stem cell numbers and muscle regeneration.\",\n      \"method\": \"Satellite cell isolation and culture; Fzd7 and Vangl2 siRNA knockdown; Wnt7a binding assay; in vivo overexpression; immunofluorescence for Vangl2 polarity\",\n      \"journal\": \"Cell Stem Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — receptor identification by binding/knockdown, pathway effector (Vangl2) epistasis, in vivo validation; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"19497282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Frizzled-5 (Fz5) mediates the synaptogenic effect of Wnt7a in hippocampal neurons; Fz5 is present in synaptosomes and co-localizes with synaptic markers; Fz5 knockdown or soluble Fz5-CRD domain blocks Wnt7a-stimulated synaptogenesis; neuronal activity recruits Fz5 to synapses in an endogenous Wnt-dependent manner.\",\n      \"method\": \"Synaptosome fractionation; Fz5 shRNA knockdown; soluble Fz5-CRD domain inhibition; high-frequency stimulation; immunofluorescence; electrophysiology\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — receptor identification by multiple methods (knockdown, dominant-negative CRD, localization), in vitro and activity-dependent contexts\",\n      \"pmids\": [\"20530549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Wnt7a signaling through Fzd7 activates the Akt/mTOR anabolic growth pathway in differentiated myofibers, inducing hypertrophy; the Fzd7 receptor complex associates with Gαs and PI3K, which are required for Wnt7a-mediated Akt/mTOR activation; this pathway is completely independent of IGF-receptor activation.\",\n      \"method\": \"Co-immunoprecipitation of Fzd7 with Gαs and PI3K; genetic loss-of-function with siRNA; myofibre hypertrophy measurements; Akt/mTOR phosphorylation assays\",\n      \"journal\": \"Nature Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP identifies complex components, pathway independence from IGF-R confirmed, multiple assays; single lab\",\n      \"pmids\": [\"22179044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Wnt7a preferentially stimulates excitatory synapse formation in hippocampal neurons; postsynaptic Dishevelled-1 (Dvl1) expression mediates increased mEPSC frequency and amplitude; Wnt7a-Dvl1 deficient mice have defects in spine morphogenesis and mossy fiber-CA3 synaptic transmission; Wnt7a rapidly activates CaMKII in dendritic spines, and CaMKII inhibition abolishes Wnt7a effects on spine growth and excitatory synaptic strength.\",\n      \"method\": \"Electrophysiology (mEPSC/mIPSC recording); Dvl1 overexpression; Wnt7a-Dvl1 double knockout mouse; CaMKII activity reporter; pharmacological CaMKII inhibition; spine morphometry\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double knockout, pharmacological epistasis, electrophysiology, live cell kinase reporter; multiple methods\",\n      \"pmids\": [\"21670302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"WNT7A signals through FZD5 receptor and β-catenin/TCF pathway in ovarian cancer cells; co-transfection with FZD5 amplifies WNT7A-activated TCF/LEF reporter; WNT7A activates MMP7 promoter through TCF-binding sites; WNT7A knockdown reduces invasion and tumor lesions in vivo.\",\n      \"method\": \"TCF/LEF luciferase reporter; FZD5 co-transfection; MMP7 promoter mutation analysis; siRNA knockdown; xenograft mouse model\",\n      \"journal\": \"Molecular Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter mutation identifies specific TCF binding sites, receptor co-transfection epistasis, in vivo xenograft; single lab\",\n      \"pmids\": [\"22232518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Fibronectin (FN) binds Syndecan-4 (Sdc4) to stimulate Wnt7a-induced satellite stem cell expansion; Sdc4 and Fzd7 form a co-receptor complex; newly activated satellite cells transiently upregulate FN to remodel their niche; FN knockdown impairs satellite cell niche repopulation; co-overexpression of FN with Wnt7a dramatically stimulates stem cell expansion in vivo.\",\n      \"method\": \"Co-immunoprecipitation of Sdc4/Fzd7; siRNA knockdown of FN, Sdc4, Fzd7; in vivo overexpression; satellite cell transplantation assays\",\n      \"journal\": \"Cell Stem Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP identifies co-receptor complex, multiple loss- and gain-of-function experiments in vitro and in vivo; single lab but highly rigorous\",\n      \"pmids\": [\"23290138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A truncated C-terminal Wnt7a variant (137 amino acids) lacking conserved palmitoylation sites retains full biological activity: it binds Fzd7, activates PCP-mediated satellite stem cell symmetric expansion and AKT/mTOR-mediated myofibre hypertrophy, and shows enhanced secretion and dispersion compared to full-length Wnt7a.\",\n      \"method\": \"Truncated protein generation; Fzd7 binding assay; satellite cell expansion assay; myofibre hypertrophy measurement; AKT/mTOR phosphorylation; secretion/dispersion assays\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — biochemical binding, cell-based functional assays with multiple pathway readouts; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"24287629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Wnt7a activates β-catenin/cyclin D1 pathway to stimulate neural stem cell proliferation and β-catenin/neurogenin-2 pathway to promote neuronal differentiation in the hippocampal dentate gyrus; Wnt7a-null mice show reduced neural stem cell population, increased cell cycle exit, and decreased newborn neurons with impaired dendritic development.\",\n      \"method\": \"Wnt7a knockout mouse; BrdU labeling; β-catenin reporter; immunofluorescence; neurosphere assay\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout with multiple molecular pathway readouts; pathway bifurcation established\",\n      \"pmids\": [\"23629626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Wnt7a/Fzd7 signaling increases the polarity and directional migration of satellite cells through activation of Dvl2 and the small GTPase Rac1; Wnt7a treatment improves tissue dispersal and engraftment of transplanted myogenic cells, enhancing muscle function.\",\n      \"method\": \"siRNA knockdown of Dvl2 and Rac1; directional migration assay; satellite cell transplantation into dystrophic muscle; functional muscle force measurements\",\n      \"journal\": \"Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic pathway dissection via siRNA epistasis, functional in vivo transplantation readout; single lab, multiple methods\",\n      \"pmids\": [\"24711502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"WNT7A/β-catenin signaling directly regulates FGF1 expression via TCF binding elements in the FGF1-1C promoter; chromatin immunoprecipitation (ChIP) demonstrates β-catenin binding to this locus; FGF1 is sufficient to drive WNT7A tumor-promoting effects in ovarian cancer.\",\n      \"method\": \"ChIP assay; TCF-binding site mutation in FGF1 promoter reporter; FGF1 knockdown in WNT7A-overexpressing cells; xenograft mouse model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP identifies direct transcriptional target, promoter mutation confirms mechanism, in vivo xenograft; single lab but rigorous\",\n      \"pmids\": [\"25174399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"WNT7A controls corneal epithelium differentiation through PAX6; loss of WNT7A or PAX6 redirects limbal stem cells toward a skin-like epithelial fate; WNT7A acts upstream of PAX6 in determining corneal epithelial cell fate.\",\n      \"method\": \"In vitro LSC expansion and 3D corneal differentiation; WNT7A and PAX6 loss-of-function; PAX6 transduction into skin epithelial stem cells; rabbit corneal transplantation model\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (WNT7A upstream of PAX6), gain-of-function rescue in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"25030175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Wnt7a induces cellular senescence independently of β-catenin and independently of the classical p16(INK4a)/p19(ARF) oncogene-induced senescence pathway; mechanistically, Wnt7a induces senescence via inactivation of SKP2 (S-phase kinase-associated protein 2); Wnt7a-null mice exhibit increased lung tumorigenesis with reduced senescence markers.\",\n      \"method\": \"Wnt7a-null mouse model (two strains); senescence marker analysis; SKP2 expression assays; carcinogen-induced tumorigenesis model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout model with pathway dissection (β-catenin independence, SKP2 identification); single lab\",\n      \"pmids\": [\"25728679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Wnt7a secreted by aggressive breast tumor cells induces cancer-associated fibroblast (CAF) conversion and promotes ECM remodeling and metastasis; mechanistically, Wnt7a-mediated fibroblast activation potentiates TGFβ receptor signaling independently of classical Wnt signaling.\",\n      \"method\": \"In vivo mouse tumor models; 3D in vitro co-culture; TGFβ signaling assays; Wnt7a-specific inhibition\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro models with pathway mechanistic dissection; single lab\",\n      \"pmids\": [\"26777421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Reck and Gpr124 are required co-receptors for Wnt7a/Wnt7b-specific signaling in CNS vascular endothelial cells; the N-terminal domain of Reck binds the LRR and Ig domains of Gpr124; soluble probes confirm that Reck and Gpr124 are part of a cell-surface complex with Frizzled, Wnt7a/Wnt7b; targeted mutagenesis of the Reck-Gpr124 interaction reduces Wnt7a signaling and impairs CNS angiogenesis.\",\n      \"method\": \"Vascular EC-specific Reck knockout; targeted mutagenesis of Reck-Gpr124 interaction; soluble probe binding assays; cell culture Wnt7a signaling assays; in vivo CNS angiogenesis analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mutagenesis identifies critical domain interface, soluble probe confirms complex assembly, in vivo genetic validation; multiple orthogonal methods\",\n      \"pmids\": [\"28803732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Wnt7a and Norrin/Fz4 systems show threshold effects and partial redundancy in maintaining the blood-brain barrier (BBB) and blood-retina barrier; combined loss of Wnt7a and Norrin, or Wnt7a and Fz4, produces far more severe BBB defects than individual losses; glia are the source of Wnt7a in the cerebellum for BBB maintenance.\",\n      \"method\": \"Conditional knockout mouse models (cell-type-specific); combinatorial genetic analysis; BBB permeability assays\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple conditional genetic combinations defining redundancy and pathway components in vivo\",\n      \"pmids\": [\"30478038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Two clusters of amino acids in Wnt7a (one at the N-terminus, one in a protruding loop) that distinguish Wnt7a/7b from other Wnts are essential for Reck/Gpr124-dependent signaling; within Reck, the fourth CC domain (CC4), specifically residues P256 and W261, is essential for Wnt7a stimulation without altering protein abundance or surface localization.\",\n      \"method\": \"Site-directed mutagenesis of Wnt7a and Reck; cell culture Wnt7a signaling assays; mouse embryo analysis of Reck CC4 mutants\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis at specific residues with in vitro and in vivo validation; single lab but rigorous mechanistic dissection\",\n      \"pmids\": [\"31225798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Wnt7a promotes VEGF signaling in pulmonary microvascular endothelial cells by facilitating Y1175 tyrosine phosphorylation in VEGFR2 through the Wnt-specific receptor ROR2; ROR2 knockdown mimics Wnt7a insufficiency and prevents recovery of tip cell formation.\",\n      \"method\": \"Recombinant Wnt7a treatment of PMVECs; ROR2 siRNA knockdown; VEGFR2 Y1175 phosphorylation assay; filopodia/tip cell formation assay; Wnt7a-/- mouse\",\n      \"journal\": \"European Respiratory Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site identified, receptor epistasis via knockdown; single lab, cell culture and mouse model\",\n      \"pmids\": [\"37024132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WNT7A inhibits adipogenesis of fibro-adipogenic progenitors (FAPs) by inducing nuclear localization of YAP through Rho GTPase in a β-catenin-independent manner and by promoting nuclear retention of YAP and TAZ in differentiating FAPs; intramuscular WNT7A injection in vivo suppresses fatty infiltration.\",\n      \"method\": \"FAP cell culture; YAP/TAZ localization by immunofluorescence; Rho inhibition; β-catenin knockdown; in vivo intramuscular injection; glycerol injury model\",\n      \"journal\": \"Stem Cell Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific pathway components identified (Rho-YAP/TAZ), β-catenin independence confirmed, in vivo validation; single lab\",\n      \"pmids\": [\"37001514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In zebrafish, Gpr124 facilitates delivery of Reck-bound Wnt7a/b to Frizzled via intracellular scaffolding mechanisms: an internal Dvl-binding motif and a C-terminal ETTV motif recruiting Dlg4 and Magi3 mediate Gpr124-Frizzled interactions; mammalian Gpr124 uses an ICD-independent mechanism involving transmembrane and extracellular domains instead.\",\n      \"method\": \"Zebrafish genetic and molecular analysis; domain deletion and mutagenesis; co-immunoprecipitation of Dvl, Dlg4, Magi3; comparison of zebrafish vs. mouse/human Gpr124\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic domain dissection across species; zebrafish model with biochemical validation; single study\",\n      \"pmids\": [\"35649360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Wnt-7a induces dissociation of the APC protein from the β-catenin cytoplasmic complex, promotes APC relocalization to membranes and clustering in neurites, and induces co-clustering of APC with α7-nicotinic acetylcholine receptors (α7-nAChRs) at presynaptic terminals in hippocampal neurons; APC serves as an intermediary for α7-nAChR presynaptic relocalization.\",\n      \"method\": \"Hippocampal neuron treatment with Wnt-7a; co-immunoprecipitation; immunofluorescence colocalization; receptor clustering assays\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrates complex disruption, immunofluorescence shows relocalization; single lab\",\n      \"pmids\": [\"17507554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Basal cell-derived WNT7A activates fibroblasts at the fibrotic niche in idiopathic pulmonary fibrosis; WNT7A inhibits AEC2 progenitor cell renewal in 3D organoid cultures; neutralizing antibodies against WNT7A or Frizzled signaling inhibitors abolish basal cell-induced fibroblast activation and attenuate lung fibrosis in a repetitive bleomycin mouse model.\",\n      \"method\": \"3D organoid cultures; conditioned medium experiments; neutralizing antibodies; small molecule Frizzled inhibitor; repetitive bleomycin in vivo model; single-cell RNA sequencing\",\n      \"journal\": \"American Journal of Respiratory Cell and Molecular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays in vitro and in vivo with specific inhibitor rescue; single lab\",\n      \"pmids\": [\"36318668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Wnt-7a stimulates dendritic spine morphogenesis in hippocampal neurons via GSK-3β inhibition, triggering β-catenin/TCF/LEF-dependent transcription and promoting PSD-95 expression; β-catenin/TCF/LEF inhibitor treatment of wild-type mice reduces spatial memory, spine density, and PSD-95 levels.\",\n      \"method\": \"Wnt-7a protein treatment of hippocampal neurons; GSK-3β and β-catenin inhibitors; Golgi staining of spine density; spatial memory behavioral testing in mice\",\n      \"journal\": \"Molecular Neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological pathway dissection with in vitro and in vivo readouts; single lab\",\n      \"pmids\": [\"29967987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SARS-CoV-2 infection suppresses Wnt/β-catenin signaling in brain endothelial cells; delivery of engineered cerebrovascular-targeted Wnt7a ligands protects BBB integrity, reduces T-cell brain infiltration, reduces microglial activation, and mitigates cognitive deficits in a mouse COVID-19 model.\",\n      \"method\": \"Transcriptional analysis of brain endothelial cells in vivo; engineered Wnt7a ligand delivery; BBB permeability assay; T-cell infiltration quantification; behavioral assays (novel object recognition, pole descent)\",\n      \"journal\": \"Brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with engineered ligand in vivo with multiple orthogonal readouts; single study\",\n      \"pmids\": [\"38306655\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WNT7A is a secreted glycoprotein that signals through distinct Frizzled receptor complexes (Fzd5/LRP6, Fzd7/Sdc4, Fzd9) to activate context-dependent downstream pathways—including canonical β-catenin/TCF transcription, non-canonical planar cell polarity (PCP/Vangl2) driving satellite stem cell symmetric expansion, Akt/mTOR-mediated myofibre hypertrophy via a Gαs/PI3K-containing Fzd7 complex, JNK/ERK5/PPARγ signaling in lung epithelial and cancer cells, and GSK-3β inhibition leading to MAP-1B dephosphorylation and synaptic remodeling in neurons—with its CNS vascular specificity conferred by obligate co-receptors Reck (binding through CC4 domain) and Gpr124 that assemble a Wnt7a/Frizzled complex to regulate blood-brain barrier integrity and CNS angiogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"WNT7A is a secreted glycoprotein morphogen that orchestrates tissue patterning, stem-cell behavior, and synaptic and vascular development by engaging distinct Frizzled receptor complexes that route signaling into both canonical β-catenin/TCF and several non-canonical effector pathways [#0, #9, #19]. In development, dorsal-ectoderm WNT7A acts as a dorsalizing signal for limb mesoderm, operating upstream of the LIM homeodomain factor Lmx1b and maintaining posterior Shh expression, with genetic epistasis showing it signals through the LRP6/β-catenin axis antagonized by Dkk1 [#0, #1, #2, #15, #14]; it likewise maintains Müllerian-duct and uterine patterning through control of the MIS receptor and Hox genes [#6, #7]. WNT7A drives satellite stem-cell symmetric expansion and directional migration through a Fzd7/Syndecan-4 co-receptor complex that activates the planar-cell-polarity effector Vangl2 and Dvl2/Rac1, and induces myofibre hypertrophy through a Fzd7–Gαs–PI3K complex activating Akt/mTOR independently of IGF signaling [#19, #24, #27, #21]. In neurons, WNT7A signaling through Fzd5 and Dishevelled inhibits GSK-3β—dephosphorylating MAP-1B—and activates CaMKII to promote axonal remodeling, excitatory synaptogenesis, and dendritic spine growth [#5, #20, #22, #8]. In CNS vasculature, WNT7A signaling requires the obligate co-receptors Reck and Gpr124, which assemble with Frizzled to maintain blood-brain barrier integrity and CNS angiogenesis; specific Wnt7a residues and the Reck CC4 domain mediate this interaction [#32, #34, #33]. In epithelial and cancer contexts WNT7A engages Fzd5/Fzd9/Fzd10 to drive β-catenin/TCF transcription of targets such as FGF1 and MMP7, or non-canonical JNK/ERK5/PPARγ and TGFβ-potentiating programs, with context-dependent tumor-suppressive or tumor-promoting and fibroblast-activating effects [#23, #28, #12, #16, #31].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established WNT7A's foundational developmental role: it was unknown what signal dorsalized the limb, and knockout/misexpression showed WNT7A is the dorsal-ectoderm cue acting upstream of Lmx1 and maintaining Shh.\",\n      \"evidence\": \"Loss-of-function mouse knockout and retroviral misexpression/ectoderm ablation in chick limb\",\n      \"pmids\": [\"7885472\", \"7585966\", \"7697724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor and co-receptor mediating limb signaling not yet identified\", \"Signal transduction branch (canonical vs non-canonical) undefined at this stage\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Placed WNT7A in a genetic hierarchy and revealed a neuronal signaling mechanism: En-1 represses Wnt-7a which induces Lmx-1b, while in neurons WNT7A acts upstream of GSK-3β inhibition to remodel axons.\",\n      \"evidence\": \"Double-mutant mouse genetics and primary cerebellar granule cell cultures with lithium epistasis\",\n      \"pmids\": [\"9362463\", \"9405095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct GSK-3β substrate in neurons not yet defined\", \"Receptor mediating neuronal effect unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identified a direct downstream substrate and broadened the physiological scope: WNT7A inhibition of GSK-3β removes phospho-MAP-1B, and WNT7A maintains reproductive-tract patterning via MIS-receptor and Hox gene control.\",\n      \"evidence\": \"In vitro kinase assay plus neuron cultures; Wnt-7a knockout mice with in situ hybridization\",\n      \"pmids\": [\"9570753\", \"9790192\", \"9671592\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How WNT7A reaches GSK-3β (receptor/Dvl link) not established\", \"Mechanism of MIS-receptor induction in mesenchyme unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrated WNT7A is a bona fide synaptogenic factor: secreted WNT7A drives presynaptic differentiation and its loss delays synaptic maturation in vivo.\",\n      \"evidence\": \"Recombinant/conditioned-medium treatment, sFRP-1 blockade, and Wnt-7a knockout cerebellar analysis\",\n      \"pmids\": [\"10721990\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor mediating synaptogenesis not yet identified\", \"Postsynaptic effectors undefined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Began defining receptor specificity and pathway bifurcation: WNT7A activates β-catenin/TCF through a Fzd5/LRP6 complex and induces E-cadherin in epithelial cells, antagonized by Dickkopfs.\",\n      \"evidence\": \"TCF-luciferase reporter assays and recombinant WNT7A treatment in PC12 and lung cancer cells\",\n      \"pmids\": [\"12857724\", \"12937339\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct Wnt7a-Fzd5 binding not yet demonstrated\", \"Single-lab, cell-line dependent\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed cell-type-dependent dual outputs: in chondrocytes WNT7A both drives β-catenin-dependent dedifferentiation and protects against apoptosis via PI3K/Akt.\",\n      \"evidence\": \"Primary chondrocyte cultures with β-catenin reporter and PI3K/Akt inhibitors\",\n      \"pmids\": [\"15082716\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor mediating each branch unidentified\", \"Mechanism linking WNT7A to PI3K not defined here\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved canonical-pathway involvement in limb development and uncovered a non-canonical Fzd9 branch: genetic Dkk1/Lrp6 epistasis confirmed canonical signaling in limb, while a direct WNT7A-Fzd9 interaction activates JNK without β-catenin in lung cancer.\",\n      \"evidence\": \"Triple-mutant mouse genetics; Co-IP and JNK reporter assays in NSCLC cells; corneal Rac/MMP-12 assays\",\n      \"pmids\": [\"15242796\", \"15880584\", \"15705594\", \"15802269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single ligand chooses canonical vs JNK output mechanistically unresolved\", \"Fzd9 binding interface uncharacterized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined a non-canonical effector cascade: WNT7A/Fzd9 acts through ERK5 to activate PPARγ, suppressing transformed growth in lung cancer.\",\n      \"evidence\": \"ERK5 and PPARγ reporter assays with pharmacological inhibitors in NSCLC cells\",\n      \"pmids\": [\"16835228\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Link between Fzd9 and ERK5 activation undefined\", \"Single lab, cell line\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Provided biochemical receptor binding and multi-Frizzled branching: purified WNT7A binds the Fzd5 CRD with nanomolar affinity, and in endometrial cells Fzd5 routes canonical while Fzd10 routes JNK signaling, both suppressed by SFRP4.\",\n      \"evidence\": \"ELISA binding and split-eGFP assays; Co-IP and pathway-specific reporters in Ishikawa cells\",\n      \"pmids\": [\"18230341\", \"18567805\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of selective pathway engagement unresolved\", \"In vivo relevance of Fzd10 branch untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established the satellite-cell stem-expansion mechanism: WNT7A signals through Fzd7 via the PCP pathway and the effector Vangl2 to drive symmetric stem-cell expansion and enhance regeneration.\",\n      \"evidence\": \"Satellite cell culture with Fzd7/Vangl2 siRNA, binding assays, and in vivo overexpression\",\n      \"pmids\": [\"19497282\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Co-receptor requirements not yet defined\", \"Downstream cytoskeletal mechanism incomplete\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified the synaptogenic receptor: Fzd5 mediates WNT7A-stimulated hippocampal synaptogenesis and is recruited to synapses in an activity-dependent manner.\",\n      \"evidence\": \"Synaptosome fractionation, Fz5 knockdown/dominant-negative CRD, and electrophysiology\",\n      \"pmids\": [\"20530549\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Postsynaptic transduction not fully resolved here\", \"How activity recruits Fz5 mechanistically unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined two muscle/neuronal mechanisms: a Fzd7-Gαs-PI3K complex activates Akt/mTOR hypertrophy independently of IGF, and postsynaptic Dvl1/CaMKII mediates WNT7A excitatory-synapse formation.\",\n      \"evidence\": \"Co-IP of Fzd7 complex and myofibre assays; Wnt7a-Dvl1 double knockout, CaMKII reporter and electrophysiology\",\n      \"pmids\": [\"22179044\", \"21670302\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Fzd7 couples to Gαs not structurally defined\", \"Connection between PCP and Akt/mTOR branches in muscle unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked WNT7A to oncogenic transcriptional output: WNT7A/FZD5/β-catenin activates the MMP7 promoter through TCF sites and promotes ovarian cancer invasion.\",\n      \"evidence\": \"TCF/LEF reporter, MMP7 promoter mutagenesis, siRNA and xenografts\",\n      \"pmids\": [\"22232518\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Other direct target genes not mapped here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the satellite-cell niche co-receptor and ligand minimal unit: Fibronectin/Syndecan-4 partners with Fzd7, and a palmitoylation-site-lacking truncated WNT7A retains full PCP and Akt/mTOR activity with enhanced dispersion.\",\n      \"evidence\": \"Co-IP of Sdc4/Fzd7, niche FN knockdown/transplantation; truncated protein binding and functional assays\",\n      \"pmids\": [\"23290138\", \"24287629\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role of lipidation in receptor selectivity not fully resolved\", \"Stoichiometry of Fzd7/Sdc4/FN complex undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended WNT7A to neural stem-cell control: β-catenin/cyclin D1 drives proliferation while β-catenin/neurogenin-2 promotes neuronal differentiation in the dentate gyrus.\",\n      \"evidence\": \"Wnt7a knockout mouse with BrdU labeling, β-catenin reporter and neurosphere assays\",\n      \"pmids\": [\"23629626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch mechanism between proliferative and differentiative outputs unknown\", \"Receptor identity in NSCs not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Expanded the regenerative and epithelial repertoire: WNT7A/Fzd7 drives Dvl2/Rac1 directional migration of satellite cells, transcriptionally controls FGF1 via β-catenin/TCF in cancer, and specifies corneal epithelial fate upstream of PAX6.\",\n      \"evidence\": \"siRNA epistasis and transplantation; ChIP and promoter mutagenesis; LSC differentiation with PAX6 rescue in vivo\",\n      \"pmids\": [\"24711502\", \"25174399\", \"25030175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor mediating corneal PAX6 control not specified\", \"Crosstalk between migration and expansion branches unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Uncovered a β-catenin-independent tumor-suppressive mechanism: WNT7A induces senescence via SKP2 inactivation, with loss increasing lung tumorigenesis.\",\n      \"evidence\": \"Two Wnt7a-null strains, senescence markers, SKP2 assays and carcinogen model\",\n      \"pmids\": [\"25728679\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor and proximal signaling to SKP2 undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed a stromal, β-catenin-independent oncogenic role: tumor-secreted WNT7A converts fibroblasts to CAFs and potentiates TGFβ signaling to drive metastasis.\",\n      \"evidence\": \"In vivo tumor models, 3D co-culture and TGFβ signaling assays\",\n      \"pmids\": [\"26777421\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor on fibroblasts unidentified\", \"Mechanism of TGFβ potentiation undefined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined CNS vascular specificity: Reck and Gpr124 are obligate co-receptors assembling a Wnt7a/Frizzled complex needed for BBB integrity and CNS angiogenesis, with the Reck N-terminus binding Gpr124 LRR/Ig domains.\",\n      \"evidence\": \"EC-specific Reck knockout, interface mutagenesis, soluble probes and in vivo angiogenesis\",\n      \"pmids\": [\"28803732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural architecture of the full complex not resolved\", \"How co-receptors confer ligand selectivity mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mapped the molecular interface and a synaptic transcriptional arm: specific Wnt7a residue clusters and the Reck CC4 domain (P256/W261) are essential for CNS signaling, while neuronal GSK-3β/β-catenin/TCF drives PSD-95 and spine morphogenesis.\",\n      \"evidence\": \"Site-directed mutagenesis with in vivo validation; hippocampal neuron pharmacology and mouse behavior\",\n      \"pmids\": [\"31225798\", \"29967987\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CC4 residues contact Wnt7a structurally undefined\", \"Relative contribution of transcriptional vs local signaling at synapses unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated co-receptor redundancy in barrier maintenance: Wnt7a and Norrin/Fz4 systems partially overlap, and glia supply WNT7A for cerebellar BBB maintenance.\",\n      \"evidence\": \"Combinatorial conditional knockout mice and BBB permeability assays\",\n      \"pmids\": [\"30478038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Threshold integration mechanism between systems unknown\", \"Endothelial responses to combined input undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Added a vascular receptor and effector: WNT7A acts through ROR2 to promote VEGFR2 Y1175 phosphorylation and tip-cell formation in pulmonary endothelium.\",\n      \"evidence\": \"Recombinant WNT7A, ROR2 siRNA, VEGFR2 phosphorylation and tip-cell assays plus Wnt7a-/- mice\",\n      \"pmids\": [\"37024132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking ROR2 to VEGFR2 phosphorylation undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined an anti-adipogenic mechanism: WNT7A drives nuclear YAP/TAZ retention through Rho GTPase, β-catenin-independently, to suppress FAP adipogenesis and fatty infiltration.\",\n      \"evidence\": \"FAP cultures with YAP/TAZ localization, Rho inhibition, β-catenin knockdown and in vivo injection\",\n      \"pmids\": [\"37001514\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor coupling to Rho-YAP undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved species-divergent Gpr124 scaffolding: zebrafish Gpr124 uses intracellular Dvl-binding and ETTV/Dlg4/Magi3 motifs to deliver Reck-bound Wnt7a to Frizzled, while mammalian Gpr124 uses an ICD-independent mechanism.\",\n      \"evidence\": \"Zebrafish genetics, domain mutagenesis and Co-IP of Dvl/Dlg4/Magi3, cross-species comparison\",\n      \"pmids\": [\"35649360\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mammalian ICD-independent mechanism not fully defined\", \"Single study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established WNT7A as a fibrotic driver: basal-cell-derived WNT7A activates fibroblasts and inhibits AEC2 renewal, with neutralizing antibodies attenuating lung fibrosis.\",\n      \"evidence\": \"3D organoids, conditioned medium, neutralizing antibodies/Frizzled inhibitor and bleomycin model with scRNA-seq\",\n      \"pmids\": [\"36318668\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Fibroblast receptor mediating activation unidentified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated therapeutic restoration of barrier signaling: SARS-CoV-2 suppresses endothelial Wnt/β-catenin, and engineered cerebrovascular-targeted Wnt7a ligands restore BBB integrity and reduce cognitive deficits.\",\n      \"evidence\": \"Engineered ligand delivery in a mouse COVID-19 model with BBB, immune and behavioral readouts\",\n      \"pmids\": [\"38306655\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Durability and dosing of engineered ligand undefined\", \"Single study\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single ligand selects among canonical β-catenin, PCP/Vangl2, Akt/mTOR, JNK/ERK5, Rho-YAP, and Reck/Gpr124-gated outputs in a cell-type-specific manner remains the central unresolved question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying structural model of ligand-receptor-co-receptor pathway selection\", \"Stoichiometry and assembly order of Fzd/co-receptor complexes undefined\", \"Determinants of canonical vs non-canonical branch choice per tissue unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [18, 19, 25, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 9, 32]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [8, 25, 39]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [18, 32, 24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 19, 21, 32]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 6, 29]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [5, 20, 22, 8]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [23, 28, 31, 39]}\n    ],\n    \"complexes\": [\n      \"Wnt7a/Frizzled/Reck/Gpr124 CNS-vascular complex\",\n      \"Fzd7/Syndecan-4 co-receptor complex\",\n      \"Fzd7/Gαs/PI3K complex\"\n    ],\n    \"partners\": [\n      \"FZD5\",\n      \"FZD7\",\n      \"FZD9\",\n      \"LRP6\",\n      \"RECK\",\n      \"GPR124\",\n      \"SDC4\",\n      \"ROR2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}