{"gene":"WNT3","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":1999,"finding":"Wnt3 is required for primitive streak, mesoderm, and node formation in mice; Wnt3-/- embryos fail to form these structures while the epiblast continues to proliferate in an undifferentiated state, demonstrating Wnt3 is essential for vertebrate primary axis formation.","method":"Gene knockout (Wnt3-/- mice) with phenotypic analysis of gastrulation and axis formation","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype, foundational study, >700 citations","pmids":["10431240"],"is_preprint":false},{"year":2003,"finding":"Ectodermal Wnt3/β-catenin signaling is required for establishment and maintenance of the apical ectodermal ridge (AER) in the limb; Wnt3 acts upstream of BMP signaling in AER establishment and dorsoventral limb polarity.","method":"Mouse knockout and conditional removal of beta-catenin in ventral ectoderm; genetic epistasis with BMP pathway","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined phenotype, genetic epistasis placing Wnt3 upstream of BMP; >230 citations","pmids":["12569130"],"is_preprint":false},{"year":2004,"finding":"A homozygous nonsense mutation (Q83X) in WNT3 causes tetra-amelia in humans, demonstrating WNT3 is required for limb formation, craniofacial, and urogenital development.","method":"Homozygosity mapping, mutation identification by sequencing in consanguineous family","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — human loss-of-function genetics with defined phenotype, >200 citations","pmids":["14872406"],"is_preprint":false},{"year":2008,"finding":"Wnt3 directly interacts with Frizzled-7 (FZD7) receptor, as demonstrated by co-immunoprecipitation, leading to activation of the canonical Wnt/β-catenin pathway in hepatocellular carcinoma cells.","method":"Co-immunoprecipitation, siRNA knockdown of FZD7, TCF transcriptional reporter assay","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus functional siRNA rescue, replicated in follow-up study (PMID 23552403)","pmids":["18313787","23552403"],"is_preprint":false},{"year":2007,"finding":"Wnt3 mediates cell adhesion-mediated drug resistance (CAM-DR) in multiple myeloma via the Wnt/RhoA/ROCK signaling pathway (non-canonical), not the canonical Dickkopf-1-sensitive pathway; this occurs through integrin α6/β1-dependent attachment to stromal cells.","method":"siRNA knockdown of Wnt3, inhibitors of Rho kinase (Y27632) and DKK-1, co-culture adhesion assays","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA KD with defined pathway phenotype; single lab study","pmids":["17575106"],"is_preprint":false},{"year":2000,"finding":"Wnt-3 infection of mouse mammary epithelial cells regulates a specific gene expression program including cyclooxygenase-2 and periostin through a β-catenin-independent pathway (since overexpression of β-catenin alone could not reproduce these effects).","method":"Retroviral infection with Wnt-3, gene expression profiling, antisense β-catenin oligonucleotides, GSK-3 inhibition","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal approaches revealing β-catenin-independent Wnt-3 signaling; single lab","pmids":["10884377"],"is_preprint":false},{"year":2008,"finding":"Dkk1 antagonizes Wnt3 activity during mouse head morphogenesis; reducing Wnt3 gene dosage in Dkk1-/- embryos partially rescues the truncated head phenotype, and Wnt3 reduction downregulates Dkk1 revealing a feedback mechanism.","method":"Compound Dkk1;Wnt3 heterozygous and Dkk1-/- Wnt3+/- mouse genetics, phenotypic analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with compound mutants defining Wnt3-Dkk1 feedback loop","pmids":["18403408"],"is_preprint":false},{"year":2005,"finding":"Wnt3 expression is first localized to the posterior visceral endoderm at E5.5, not in a radial ring in the proximal epiblast as previously thought; local cell-cell interactions in the posterior egg cylinder establish localized Wnt3 expression preceding primitive streak formation.","method":"Whole-mount in situ hybridization and lineage tracing at tightly staged embryonic timepoints","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — refined spatial localization with lineage analysis; single lab","pmids":["16289026"],"is_preprint":false},{"year":2012,"finding":"Conditional inactivation of Wnt3 in the epiblast allows gastrulation to initiate but prevents its maintenance; Wnt3 regulates its own expression and that of primitive streak markers via canonical Wnt/β-catenin signaling.","method":"Conditional Cre-mediated Wnt3 knockout in epiblast, molecular marker analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined phenotypic and molecular readouts, genetic epistasis","pmids":["23085236"],"is_preprint":false},{"year":2007,"finding":"Wnt3 expression in the epiblast (but not posterior visceral endoderm) is required for primitive streak induction and mesoderm formation; chimeric analyses and conditional Wnt3 removal define tissue-specific requirements.","method":"Chimeric embryo analyses, conditional Wnt3 knockout, phenotypic analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — chimeric and conditional genetics defining cell-autonomous requirement; replicated across labs","pmids":["18028899"],"is_preprint":false},{"year":2015,"finding":"Wnt3 in the posterior visceral endoderm (extra-embryonic tissue) is required for timely formation and correct positioning of the primitive streak; embryos lacking Wnt3 in the visceral endoderm show delayed streak formation but appear normal by E9.5.","method":"Conditional Wnt3 knockout restricted to visceral endoderm, embryonic phenotype analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific conditional KO with defined developmental phenotype","pmids":["25907228"],"is_preprint":false},{"year":2013,"finding":"WNT3 inhibits cerebellar granule cell progenitor (GCP) proliferation via a non-canonical pathway activating ERK1/2 and ERK5 MAPKs (rather than β-catenin), downregulating Sonic Hedgehog target genes and Atoh1; MEK inhibition reverses WNT3's anti-proliferative effect.","method":"In vitro GCP proliferation assays, MEK inhibitor rescue, Western blot for MAPK activation, medulloblastoma mouse models","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological rescue and pathway biochemistry; single lab but multiple methods","pmids":["24303070"],"is_preprint":false},{"year":2011,"finding":"Astrocyte-secreted Wnt3 promotes neural stem cell (NSC) differentiation in the adult hippocampus in a paracrine manner; decline in Wnt3-secreting astrocytes with aging impairs neurogenesis, and exercise rescues neurogenesis by increasing Wnt3 levels.","method":"In vivo analysis of Wnt3-secreting astrocytes, exercise intervention, chromatin state analysis of downstream target genes","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — paracrine secretion established with defined cellular source and target gene consequences; single lab","pmids":["21746862"],"is_preprint":false},{"year":2015,"finding":"WNT3 protein is specifically expressed in trophectoderm of human blastocysts and promotes trophoblast development; WNT3 addition or GSK3 inhibition promoted EOMES expression for trophoblast fate, via membrane-associated β-catenin rather than nuclear/canonical TCF1 targets.","method":"β-catenin gain/loss-of-function in human preimplantation embryos, WNT3 protein addition, immunostaining for lineage markers","journal":"Molecular human reproduction","confidence":"Medium","confidence_rationale":"Tier 2 — functional experiments in human embryos with defined molecular readouts; single lab","pmids":["26108805"],"is_preprint":false},{"year":2016,"finding":"SPIM-FCS analysis in live zebrafish embryos demonstrates that Wnt3 is associated with cholesterol-dependent membrane domains in vivo, and this association requires palmitoylation by Porcupine; inhibition of Porcupine reduces Wnt3 membrane-domain association and causes defective brain development.","method":"Single plane illumination microscopy-fluorescence correlation spectroscopy (SPIM-FCS), Porcupine inhibitor (C59), cholesterol reduction in live transgenic zebrafish","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1-2 — quantitative biophysical method in live animals with pharmacological manipulation and functional brain phenotype; multiple orthogonal approaches","pmids":["27463143"],"is_preprint":false},{"year":2019,"finding":"Palmitoylation of Wnt3 at a conserved serine residue (by Porcupine) is dispensable for secretion and initial Frizzled-8 binding, but essential for Wnt3's association with ordered membrane domains and for activation of Wnt/β-catenin signaling in zebrafish embryos and mammalian cells.","method":"Site-directed mutagenesis of palmitoylation site, membrane domain organization assays, Wnt/β-catenin reporter assay in mammalian cells and zebrafish","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis combined with functional signaling and membrane organization assays in two model systems","pmids":["31803740"],"is_preprint":false},{"year":2021,"finding":"Wnt3 is lipid-modified at both conserved cysteine (C80) and serine (S212) residues in zebrafish neural tissue; lipidation at either residue is sufficient for Wnt3 secretion and membrane organization, but lipid modification at S212 is indispensable for receptor interaction and signaling.","method":"Cysteine-to-alanine and serine-to-alanine point mutations (C80A, S212A), FCS-based membrane organization, secretion assays, signaling reporter","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 1 — reconstitution-level mutagenesis with functional validation at multiple levels","pmids":["34124053"],"is_preprint":false},{"year":2020,"finding":"Wnt3 spreads extracellularly in the zebrafish brain via diffusion modified by tissue morphology and interactions with heparan sulfate proteoglycans (HSPG); Wnt3 binding to its receptor Frizzled1 requires the co-receptor LRP5, as demonstrated by fluorescence cross-correlation spectroscopy.","method":"Fluorescence correlation spectroscopy, fluorescence recovery after photobleaching (FRAP), fluorescence cross-correlation spectroscopy (FCCS), LRP5 knockdown","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 — quantitative biophysical measurements of binding affinities and mobility in live tissue with genetic validation","pmids":["33236989"],"is_preprint":false},{"year":2017,"finding":"YAP binds to the WNT3 gene enhancer in hESCs and prevents WNT3 induction by Activin/SMAD signaling, thereby maintaining pluripotency; CRISPR/Cas9 knockout of YAP enables Activin to induce Wnt3 expression, stabilize β-catenin, and cooperate with SMADs to drive cardiac mesoderm differentiation.","method":"ChIP-seq, CRISPR/Cas9 YAP knockout, luciferase reporter, directed differentiation of hESCs","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-seq defines YAP occupancy at WNT3 enhancer, CRISPR KO with functional differentiation phenotype, multiple orthogonal methods","pmids":["29269485"],"is_preprint":false},{"year":2013,"finding":"WNT3 mRNA level in hESCs correlates with and is required for definitive endoderm (DE) differentiation; WNT3 knockdown inhibits and overexpression promotes DE differentiation in a WNT3 level-dependent manner.","method":"WNT3 siRNA knockdown and overexpression in multiple hESC lines, quantitative DE differentiation assays","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — loss- and gain-of-function with defined differentiation phenotype; single lab","pmids":["24052941"],"is_preprint":false},{"year":2013,"finding":"Temozolomide methylates the WNT3 gene promoter in blood-brain barrier cells, reducing Wnt3 synthesis and disrupting Wnt3/GSK3/β-catenin signaling, which decreases β-catenin binding to the MDR1 promoter and lowers P-glycoprotein expression.","method":"Promoter methylation analysis, Wnt3 siRNA, β-catenin ChIP on MDR1 promoter, Pgp efflux assays in BBB cells","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods linking Wnt3 promoter methylation to downstream Pgp regulation; single lab","pmids":["23771630"],"is_preprint":false},{"year":2022,"finding":"Flotillin-2 (Flot2) together with Wnt co-receptor Ror2 determines the number and length of Wnt3-carrying cytonemes in gastric cancer cells; cytoneme-mediated Wnt3 transport between cells promotes proliferation and cell survival.","method":"Live-cell imaging of Wnt3-cytonemes, Flot2 overexpression/knockdown, Ror2 perturbation, functional proliferation/survival assays; zebrafish Wnt8a cytoneme validation","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — direct imaging of cytonemes with mechanistic perturbations and cross-species validation","pmids":["36040316"],"is_preprint":false},{"year":2022,"finding":"HNF4α acts as an upstream transcriptional regulator of intestinal Wnt3 expression and Paneth cell differentiation; deletion of Hnf4a in jejunal enteroids reduces Wnt3, and supplementation with Wnt3a rescues cell death and transcriptional defects.","method":"Hnf4a conditional knockout in enteroids, transcriptomics, Wnt3a supplementation rescue experiment","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with rescue by Wnt3a supplementation; single lab","pmids":["36464209"],"is_preprint":false},{"year":2023,"finding":"(Pro)renin receptor ((P)RR) inhibits NEDD4L-mediated ubiquitination of Wnt3 protein, thereby stabilizing Wnt3 and activating Wnt/β-catenin signaling to promote colorectal cancer progression.","method":"Co-immunoprecipitation of Wnt3 with NEDD4L, immunofluorescence colocalization, ATP6AP2 knock-in mice, western blot for Wnt3 ubiquitination","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP and genetic mouse model establishing (P)RR-NEDD4L-Wnt3 ubiquitination axis; single lab","pmids":["36597142"],"is_preprint":false},{"year":2024,"finding":"Wnt3 is N-glycosylated at two sites (Asn90 and Asn301); mutation of Asn301 alone destabilizes Wnt3 protein, while simultaneous mutation of both sites reduces Wnt3-FZD7 binding and downstream Wnt/β-catenin signaling, as well as HCC cell proliferation and invasion.","method":"Site-directed mutagenesis of N-glycosylation sites, laser confocal microscopy for FZD7 binding, actinomycin D stability assay, western blot, cell function assays","journal":"World journal of gastrointestinal oncology","confidence":"Medium","confidence_rationale":"Tier 1 — mutagenesis with functional readouts; single lab","pmids":["38994173"],"is_preprint":false},{"year":2017,"finding":"TGF-β-induced EMT in HER2-overexpressing breast cancer cells upregulates Wnt3 via a Smad3-dependent pathway; Twist transcription factor directly occupies the Wnt3 promoter (validated by ChIP) to drive Wnt3 expression downstream of TGF-β.","method":"ChIP assay for Twist at Wnt3 promoter, Twist shRNA knockdown, ELISA for secreted Wnt3, western blot, Smad3 pathway inhibition","journal":"Breast cancer research and treatment","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus shRNA rescue linking TGF-β/Smad3/Twist to Wnt3 transcription; single lab","pmids":["28337662"],"is_preprint":false},{"year":2012,"finding":"Wnt3 expression in Xenopus and zebrafish activates canonical Wnt/β-catenin signaling; Wnt3 and Wnt3a together are required for induction of the mid-diencephalic organizer (MDO) in zebrafish, acting in a narrow 4-hour time window; loss of Wnt3/Wnt3a leads to apoptosis within the organizer primordium, and blocking apoptosis rescues MDO formation.","method":"Morpholino knockdown of wnt3 and wnt3a, canonical Wnt pathway pharmacological activation, apoptosis blockade rescue experiment, in situ hybridization","journal":"Neural development","confidence":"Medium","confidence_rationale":"Tier 2 — combined morphant genetics with rescue experiments defining Wnt3's role and mechanism; single lab","pmids":["22475147"],"is_preprint":false},{"year":2018,"finding":"Wnt3 modulates axon regeneration in adult DRG neurons by repressing mRNA translation of the transcription factor Gata4 via binding to the Gata4 3'UTR; downregulation of Wnt3 increases axon regeneration while Gata4 knockdown reverses the enhanced regeneration caused by Wnt3 downregulation.","method":"Wnt3 overexpression and knockdown in DRG neurons in vitro and in vivo, 3'UTR binding assay, Gata4 siRNA epistasis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis experiment with 3'UTR binding validation; single lab","pmids":["29567480"],"is_preprint":false},{"year":2023,"finding":"ZFX transcriptionally regulates WNT3 in CML stem/progenitor cells (validated by ChIP and luciferase reporter assays); WNT3 activates β-catenin/c-MYC/CCND1 signaling and mediates ZFX-dependent growth and imatinib resistance; WNT3 overexpression rescues ZFX silencing phenotypes.","method":"ChIP assay, luciferase reporter, shRNA and CRISPR/dCas9 silencing, rescue overexpression, microarray","journal":"Cellular & molecular biology letters","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and luciferase reporter establishing ZFX as direct Wnt3 transcriptional regulator, rescue epistasis; single lab","pmids":["37864206"],"is_preprint":false},{"year":2010,"finding":"Human Wnt3-Frizzled1 chimera activates TCF-luciferase reporter; the Frizzled1 cytoplasmic tail (PDZ binding region) and the CRD second cysteine loop are required for Wnt3-Fz1 signaling; DKK-1 blocks the chimera's activity, implicating LRP co-receptor; the chimera promotes osteoblast and inhibits adipocyte differentiation in C3H10T1/2 cells.","method":"Wnt3-Fz1 chimera construction, deletion and point mutagenesis, TCF-luciferase reporter assay, DKK-1 inhibition, cell differentiation assays","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 — structure-function mutagenesis with functional signaling readouts; single lab","pmids":["20039315"],"is_preprint":false},{"year":2015,"finding":"Thalamic WNT3 secretion regulates neocortical ribosome composition by changing levels of Ribosomal protein L7 in polysome complexes during mid-neurogenesis, thereby controlling selective mRNA translation (including Foxp2 and Apc) to specify neocortical cell subtypes.","method":"Polysome fractionation, RNA sequencing, in vivo thalamic axon manipulation with WNT3 secretion analysis","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — direct biochemical fractionation with in vivo manipulation; single lab","pmids":["26245956"],"is_preprint":false},{"year":2012,"finding":"Wnt3 overexpression in breast cancer cells (SKBR3) activates Wnt/β-catenin signaling, increases nuclear β-catenin, transactivates EGFR expression, promotes EMT-like transition (increased N-cadherin, Twist, Slug; decreased E-cadherin), and confers trastuzumab resistance; Wnt3 siRNA reverses these effects.","method":"Stable Wnt3 transfection, siRNA knockdown, western blot, β-catenin localization, invasion assays","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 — stable transfection and siRNA rescue with multiple molecular and functional readouts; single lab","pmids":["23071104"],"is_preprint":false},{"year":2017,"finding":"Defective Wnt3 expression by post-pubertal Sertoli cells (achieved via shRNA transgenic mice) leads to subfertility and oligozoospermia with diminished expression of Connexin43, a gap-junctional molecule essential for germ cell development; FSH and testosterone regulate Wnt3 in pubertal Sertoli cells.","method":"Transgenic shRNA-mediated Wnt3 knockdown in Sertoli cells, spermatogenesis analysis, Connexin43 expression","journal":"Cell and tissue research","confidence":"Medium","confidence_rationale":"Tier 2 — conditional transgenic KD with defined fertility and molecular phenotype; single lab","pmids":["29064078"],"is_preprint":false}],"current_model":"WNT3 is a palmitoylated and N-glycosylated secreted ligand that, after lipid modification by Porcupine in the ER at conserved Cys and Ser residues, associates with cholesterol-dependent plasma membrane domains and spreads extracellularly via diffusion modulated by HSPG interactions; it binds Frizzled receptors (particularly FZD7) in a manner requiring the LRP5/6 co-receptor to activate canonical Wnt/β-catenin signaling, while also engaging non-canonical Wnt/RhoA/ROCK and MAPK/ERK pathways in context-dependent fashion; it is transcriptionally regulated by YAP, HNF4α, ZFX, and Twist (downstream of TGF-β/Smad3), and its protein stability is controlled by NEDD4L-mediated ubiquitination; in development, Wnt3 is essential for primitive streak and mesoderm formation, AER establishment, thalamic organizer induction, and adult neurogenesis, while in cancer it drives EMT, drug resistance, and proliferation through β-catenin activation."},"narrative":{"teleology":[{"year":1999,"claim":"Establishing that Wnt3 is required for vertebrate primary axis formation resolved whether Wnt3 is essential or redundant among Wnt ligands during gastrulation.","evidence":"Wnt3-/- mouse knockout showing failure of primitive streak, mesoderm, and node formation","pmids":["10431240"],"confidence":"High","gaps":["Tissue-specific source of Wnt3 (epiblast vs. visceral endoderm) not resolved","Downstream transcriptional targets not identified","Mechanism of ligand secretion and spread unknown"]},{"year":2000,"claim":"Demonstrating that Wnt3 activates a β-catenin-independent gene expression program (including COX-2 and periostin) established that Wnt3 signals through non-canonical pathways in addition to canonical β-catenin.","evidence":"Retroviral Wnt3 expression in mammary epithelial cells; antisense β-catenin and GSK3 inhibition failing to recapitulate Wnt3 target gene induction","pmids":["10884377"],"confidence":"Medium","gaps":["Identity of the non-canonical pathway not determined","Receptor mediating β-catenin-independent signaling unknown"]},{"year":2003,"claim":"Defining Wnt3's role in AER establishment and limb patterning upstream of BMP signaling extended the gene's developmental functions beyond gastrulation to organogenesis.","evidence":"Mouse conditional β-catenin knockout in ventral ectoderm with genetic epistasis to BMP pathway","pmids":["12569130"],"confidence":"High","gaps":["Whether Wnt3 acts directly on AER precursors or indirectly via BMP not fully resolved"]},{"year":2004,"claim":"Identification of a homozygous WNT3 nonsense mutation (Q83X) causing human tetra-amelia linked a Mendelian disease to WNT3 loss-of-function and confirmed the essential role in limb formation across species.","evidence":"Homozygosity mapping and sequencing in a consanguineous family","pmids":["14872406"],"confidence":"High","gaps":["Genotype–phenotype spectrum for hypomorphic alleles unknown","Craniofacial and urogenital phenotype mechanisms not dissected"]},{"year":2007,"claim":"Resolving the tissue-specific requirement for Wnt3 in gastrulation showed that epiblast-expressed Wnt3, not visceral endoderm Wnt3, is essential for primitive streak induction, while visceral endoderm Wnt3 modulates timing.","evidence":"Chimeric embryo analyses and tissue-specific conditional Wnt3 knockout in mice","pmids":["18028899","25907228","16289026"],"confidence":"High","gaps":["Signals initiating Wnt3 expression in the posterior visceral endoderm not identified","Quantitative threshold of Wnt3 required for streak induction unknown"]},{"year":2007,"claim":"Discovery that Wnt3 mediates cell adhesion-mediated drug resistance in myeloma via a non-canonical RhoA/ROCK pathway (insensitive to DKK-1) identified a context-specific non-canonical effector route.","evidence":"siRNA knockdown of Wnt3, Rho kinase inhibitor Y27632, DKK-1 insensitivity, co-culture adhesion assays in myeloma cells","pmids":["17575106"],"confidence":"Medium","gaps":["Receptor mediating Wnt3-RhoA axis not identified","Whether this pathway operates in non-cancer contexts unknown"]},{"year":2008,"claim":"Establishing that Wnt3 directly binds FZD7 and that Dkk1 antagonizes Wnt3 during head morphogenesis defined the ligand–receptor pair and a negative feedback loop regulating canonical signaling.","evidence":"Co-immunoprecipitation of Wnt3-FZD7, compound Dkk1;Wnt3 heterozygous mouse genetics","pmids":["18313787","18403408"],"confidence":"High","gaps":["Structural basis of Wnt3-FZD7 interaction not determined","Whether Wnt3-Dkk1 feedback operates in all Wnt3-expressing tissues unknown"]},{"year":2012,"claim":"Demonstrating that Wnt3 regulates its own expression via β-catenin during gastrulation maintenance and drives EMT/trastuzumab resistance in breast cancer consolidated Wnt3's role as both a developmental autoregulatory signal and an oncogenic driver.","evidence":"Conditional epiblast Wnt3 KO with molecular marker analysis; stable Wnt3 transfection in SKBR3 breast cancer cells with β-catenin nuclear localization, EGFR transactivation, and EMT marker analysis","pmids":["23085236","23071104"],"confidence":"High","gaps":["Autoregulatory enhancer elements not mapped","Whether Wnt3-driven EMT is reversible unknown"]},{"year":2013,"claim":"Identification of Wnt3's non-canonical MAPK/ERK pathway activation in cerebellar granule cell progenitors and its role in definitive endoderm differentiation of hESCs showed that Wnt3 dosage specifies distinct cell fates through pathway selection.","evidence":"MEK inhibitor rescue in GCP proliferation assays; WNT3 knockdown/overexpression in multiple hESC lines with DE differentiation quantification","pmids":["24303070","24052941"],"confidence":"Medium","gaps":["Mechanism of pathway selection (canonical vs. MAPK) at the receptor level not known","Whether Wnt3 and Wnt3a have overlapping roles in DE specification not resolved"]},{"year":2016,"claim":"Biophysical demonstration that Wnt3 associates with cholesterol-dependent membrane domains in a Porcupine/palmitoylation-dependent manner in vivo resolved how lipid modification controls Wnt3 membrane behavior and signaling competence.","evidence":"SPIM-FCS in live zebrafish embryos with Porcupine inhibitor C59 and cholesterol reduction","pmids":["27463143"],"confidence":"High","gaps":["Which specific lipid species (palmitoleate vs. palmitate) is added not resolved by imaging","Whether membrane domain association is required for all Wnt3 signaling outputs unknown"]},{"year":2019,"claim":"Mutagenesis of the conserved serine palmitoylation site demonstrated that this modification is dispensable for Wnt3 secretion and initial Frizzled binding but essential for membrane domain organization and signaling activation, separating secretion from signaling competence.","evidence":"Site-directed mutagenesis of Ser palmitoylation site with β-catenin reporter assays in mammalian cells and zebrafish embryos","pmids":["31803740"],"confidence":"High","gaps":["Structural mechanism by which palmitoylation enables signaling not determined","Whether cysteine-site lipidation has independent signaling functions not fully addressed"]},{"year":2020,"claim":"Quantitative biophysical measurement of Wnt3 extracellular spread showed HSPG-modulated diffusion (not free diffusion alone) and established that LRP5 co-receptor is required for Wnt3-Frizzled1 binding, defining the minimal receptor complex.","evidence":"FCS, FRAP, and FCCS in live zebrafish brain tissue with LRP5 knockdown","pmids":["33236989"],"confidence":"High","gaps":["Whether other co-receptors (LRP6, Ror2) substitute for LRP5 in Wnt3 binding not tested","Binding affinities for different Frizzled family members not compared"]},{"year":2021,"claim":"Systematic mutagenesis of both lipidation sites (C80, S212) showed that either is sufficient for secretion and membrane organization, but S212 lipidation is specifically indispensable for receptor interaction and signaling, establishing a hierarchy of lipid modifications.","evidence":"C80A and S212A point mutations with FCS-based membrane assays, secretion assays, and signaling reporters in zebrafish neural tissue","pmids":["34124053"],"confidence":"High","gaps":["Crystal structure of differentially lipidated Wnt3 not available","Whether the lipidation hierarchy applies to other Wnt family members unknown"]},{"year":2017,"claim":"Identification of YAP as a direct repressor at the WNT3 enhancer and Twist/Smad3 as activators at the WNT3 promoter defined upstream transcriptional logic controlling WNT3 expression in pluripotency exit and EMT.","evidence":"ChIP-seq for YAP in hESCs with CRISPR KO; ChIP for Twist at Wnt3 promoter with Smad3 inhibition in breast cancer cells","pmids":["29269485","28337662"],"confidence":"High","gaps":["Whether YAP and Twist compete at overlapping regulatory elements unknown","Epigenetic regulation of the WNT3 locus not fully mapped"]},{"year":2022,"claim":"Discovery that Flotillin-2 and Ror2 regulate Wnt3-carrying cytonemes and that HNF4α is an upstream transcriptional regulator of intestinal Wnt3 expanded the mechanisms of Wnt3 transport and tissue-specific transcriptional control.","evidence":"Live-cell imaging of cytonemes with Flot2/Ror2 perturbation in gastric cancer cells; Hnf4a conditional knockout in jejunal enteroids with Wnt3a rescue","pmids":["36040316","36464209"],"confidence":"High","gaps":["Relative contribution of cytonemes vs. diffusion to Wnt3 spread in vivo not quantified","Whether HNF4α directly binds the Wnt3 promoter not shown"]},{"year":2023,"claim":"Establishing that (P)RR stabilizes Wnt3 protein by inhibiting NEDD4L-mediated ubiquitination and that ZFX directly transactivates WNT3 in CML stem cells defined post-translational and transcriptional regulatory axes in cancer.","evidence":"Co-IP of Wnt3 with NEDD4L, ATP6AP2 knock-in mice; ChIP and luciferase for ZFX at WNT3 promoter with rescue overexpression","pmids":["36597142","37864206"],"confidence":"Medium","gaps":["NEDD4L ubiquitination sites on Wnt3 not mapped","Whether ZFX regulation of WNT3 operates outside CML not tested","Whether (P)RR-mediated stabilization occurs before or after Wnt3 secretion not resolved"]},{"year":2024,"claim":"Demonstrating that N-glycosylation at Asn301 is required for Wnt3 protein stability and that dual glycosylation (Asn90/Asn301) is needed for FZD7 binding and signaling defined a second class of essential post-translational modification for Wnt3 function.","evidence":"Site-directed mutagenesis of N-glycosylation sites with confocal FZD7 binding assay, stability assays, and HCC cell function assays","pmids":["38994173"],"confidence":"Medium","gaps":["Glycan structures at each site not characterized","Whether glycosylation affects Wnt3 interaction with LRP5/6 not tested"]},{"year":null,"claim":"The structural basis of Wnt3-Frizzled-LRP complex assembly, the mechanism governing canonical vs. non-canonical pathway selection at the receptor level, and whether cytoneme- vs. diffusion-mediated transport predominates in specific tissues remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of Wnt3 in complex with its receptor","Pathway selection mechanism between canonical and non-canonical routes not defined","In vivo quantitative comparison of transport modes lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,1,3,8,15,17,24]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[3,4,11,29]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[12,14,17,21]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[14,15,16]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,4,8,11,15,17,23,29]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1,2,7,9,10,26]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[4,23,28,31]}],"complexes":[],"partners":["FZD7","FZD1","LRP5","NEDD4L","FLOT2","ROR2","DKK1"],"other_free_text":[]},"mechanistic_narrative":"WNT3 is a secreted Wnt family ligand essential for vertebrate axis formation, limb development, and germ layer specification, functioning through both canonical β-catenin and non-canonical (RhoA/ROCK, MAPK/ERK) signaling pathways depending on cellular context. WNT3 undergoes Porcupine-mediated palmitoylation at conserved cysteine (C80) and serine (S212) residues and N-glycosylation at Asn90 and Asn301; palmitoylation at S212 is dispensable for secretion but required for cholesterol-dependent membrane domain association, Frizzled receptor engagement, and downstream β-catenin signaling, while N-glycosylation at Asn301 is necessary for protein stability [PMID:31803740, PMID:34124053, PMID:38994173]. WNT3 binds Frizzled receptors (FZD7, FZD1) in an LRP5/6 co-receptor-dependent manner, spreads extracellularly via HSPG-modulated diffusion, and can also be transported between cells via Flotillin-2/Ror2-dependent cytonemes; its protein stability is regulated by NEDD4L-mediated ubiquitination [PMID:33236989, PMID:18313787, PMID:36040316, PMID:36597142]. Homozygous loss-of-function mutations in WNT3 cause tetra-amelia syndrome in humans [PMID:14872406]."},"prefetch_data":{"uniprot":{"accession":"P56703","full_name":"Proto-oncogene Wnt-3","aliases":["Proto-oncogene Int-4 homolog"],"length_aa":355,"mass_kda":39.6,"function":"Ligand for members of the frizzled family of seven transmembrane receptors (Probable). Functions in the canonical Wnt signaling pathway that results in activation of transcription factors of the TCF/LEF family (PubMed:26902720). Required for normal gastrulation, formation of the primitive streak, and for the formation of the mesoderm during early embryogenesis. Required for normal formation of the apical ectodermal ridge (By similarity). Required for normal embryonic development, and especially for limb development (PubMed:14872406)","subcellular_location":"Secreted, extracellular space, extracellular matrix; Secreted","url":"https://www.uniprot.org/uniprotkb/P56703/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WNT3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/WNT3","total_profiled":1310},"omim":[{"mim_id":"618021","title":"TETRAAMELIA SYNDROME 2; TETAMS2","url":"https://www.omim.org/entry/618021"},{"mim_id":"616426","title":"CENTROSOMAL PROTEIN, 192-KD; CEP192","url":"https://www.omim.org/entry/616426"},{"mim_id":"611514","title":"WNT LIGAND SECRETION MEDIATOR; 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Hsa-miR-374a-3p/Wnt3/β-Catenin-Mediated Epithelial-Mesenchymal Transition and Cellular Plasticity.","date":"2022","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/35837105","citation_count":8,"is_preprint":false},{"pmid":"30355643","id":"PMC_30355643","title":"Association of the WNT3 polymorphisms and non-syndromic cleft lip with or without cleft palate: evidence from a meta-analysis.","date":"2018","source":"Bioscience reports","url":"https://pubmed.ncbi.nlm.nih.gov/30355643","citation_count":7,"is_preprint":false},{"pmid":"32501574","id":"PMC_32501574","title":"LncWNT3-IT affects the proliferation of Sertoli cells by regulating the expression of the WNT3 gene in goat testis.","date":"2020","source":"Reproduction in domestic animals = Zuchthygiene","url":"https://pubmed.ncbi.nlm.nih.gov/32501574","citation_count":7,"is_preprint":false},{"pmid":"20039315","id":"PMC_20039315","title":"Wnt3-frizzled 1 chimera as a model to study canonical Wnt 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Yi xue ban = Journal of Central South University. Medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/34275925","citation_count":5,"is_preprint":false},{"pmid":"36503938","id":"PMC_36503938","title":"Chronic GPER activation prompted the proliferation of ileal stem cell in ovariectomized mice depending on Paneth cell-derived Wnt3.","date":"2023","source":"Clinical science (London, England : 1979)","url":"https://pubmed.ncbi.nlm.nih.gov/36503938","citation_count":4,"is_preprint":false},{"pmid":"38994173","id":"PMC_38994173","title":"N-glycosylation of Wnt3 regulates the progression of hepatocellular carcinoma by affecting Wnt/β-catenin signal pathway.","date":"2024","source":"World journal of gastrointestinal oncology","url":"https://pubmed.ncbi.nlm.nih.gov/38994173","citation_count":4,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51310,"output_tokens":7392,"usd":0.132405},"stage2":{"model":"claude-opus-4-6","input_tokens":11245,"output_tokens":4161,"usd":0.240375},"total_usd":0.37278,"stage1_batch_id":"msgbatch_01BparvgRZ9S2LMidvaoo86K","stage2_batch_id":"msgbatch_01NkBfv9SVZWthhS7j6mU6G3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"Wnt3 is required for primitive streak, mesoderm, and node formation in mice; Wnt3-/- embryos fail to form these structures while the epiblast continues to proliferate in an undifferentiated state, demonstrating Wnt3 is essential for vertebrate primary axis formation.\",\n      \"method\": \"Gene knockout (Wnt3-/- mice) with phenotypic analysis of gastrulation and axis formation\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, foundational study, >700 citations\",\n      \"pmids\": [\"10431240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Ectodermal Wnt3/β-catenin signaling is required for establishment and maintenance of the apical ectodermal ridge (AER) in the limb; Wnt3 acts upstream of BMP signaling in AER establishment and dorsoventral limb polarity.\",\n      \"method\": \"Mouse knockout and conditional removal of beta-catenin in ventral ectoderm; genetic epistasis with BMP pathway\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined phenotype, genetic epistasis placing Wnt3 upstream of BMP; >230 citations\",\n      \"pmids\": [\"12569130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A homozygous nonsense mutation (Q83X) in WNT3 causes tetra-amelia in humans, demonstrating WNT3 is required for limb formation, craniofacial, and urogenital development.\",\n      \"method\": \"Homozygosity mapping, mutation identification by sequencing in consanguineous family\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human loss-of-function genetics with defined phenotype, >200 citations\",\n      \"pmids\": [\"14872406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Wnt3 directly interacts with Frizzled-7 (FZD7) receptor, as demonstrated by co-immunoprecipitation, leading to activation of the canonical Wnt/β-catenin pathway in hepatocellular carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of FZD7, TCF transcriptional reporter assay\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional siRNA rescue, replicated in follow-up study (PMID 23552403)\",\n      \"pmids\": [\"18313787\", \"23552403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Wnt3 mediates cell adhesion-mediated drug resistance (CAM-DR) in multiple myeloma via the Wnt/RhoA/ROCK signaling pathway (non-canonical), not the canonical Dickkopf-1-sensitive pathway; this occurs through integrin α6/β1-dependent attachment to stromal cells.\",\n      \"method\": \"siRNA knockdown of Wnt3, inhibitors of Rho kinase (Y27632) and DKK-1, co-culture adhesion assays\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA KD with defined pathway phenotype; single lab study\",\n      \"pmids\": [\"17575106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Wnt-3 infection of mouse mammary epithelial cells regulates a specific gene expression program including cyclooxygenase-2 and periostin through a β-catenin-independent pathway (since overexpression of β-catenin alone could not reproduce these effects).\",\n      \"method\": \"Retroviral infection with Wnt-3, gene expression profiling, antisense β-catenin oligonucleotides, GSK-3 inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches revealing β-catenin-independent Wnt-3 signaling; single lab\",\n      \"pmids\": [\"10884377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Dkk1 antagonizes Wnt3 activity during mouse head morphogenesis; reducing Wnt3 gene dosage in Dkk1-/- embryos partially rescues the truncated head phenotype, and Wnt3 reduction downregulates Dkk1 revealing a feedback mechanism.\",\n      \"method\": \"Compound Dkk1;Wnt3 heterozygous and Dkk1-/- Wnt3+/- mouse genetics, phenotypic analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with compound mutants defining Wnt3-Dkk1 feedback loop\",\n      \"pmids\": [\"18403408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Wnt3 expression is first localized to the posterior visceral endoderm at E5.5, not in a radial ring in the proximal epiblast as previously thought; local cell-cell interactions in the posterior egg cylinder establish localized Wnt3 expression preceding primitive streak formation.\",\n      \"method\": \"Whole-mount in situ hybridization and lineage tracing at tightly staged embryonic timepoints\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — refined spatial localization with lineage analysis; single lab\",\n      \"pmids\": [\"16289026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Conditional inactivation of Wnt3 in the epiblast allows gastrulation to initiate but prevents its maintenance; Wnt3 regulates its own expression and that of primitive streak markers via canonical Wnt/β-catenin signaling.\",\n      \"method\": \"Conditional Cre-mediated Wnt3 knockout in epiblast, molecular marker analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined phenotypic and molecular readouts, genetic epistasis\",\n      \"pmids\": [\"23085236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Wnt3 expression in the epiblast (but not posterior visceral endoderm) is required for primitive streak induction and mesoderm formation; chimeric analyses and conditional Wnt3 removal define tissue-specific requirements.\",\n      \"method\": \"Chimeric embryo analyses, conditional Wnt3 knockout, phenotypic analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — chimeric and conditional genetics defining cell-autonomous requirement; replicated across labs\",\n      \"pmids\": [\"18028899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Wnt3 in the posterior visceral endoderm (extra-embryonic tissue) is required for timely formation and correct positioning of the primitive streak; embryos lacking Wnt3 in the visceral endoderm show delayed streak formation but appear normal by E9.5.\",\n      \"method\": \"Conditional Wnt3 knockout restricted to visceral endoderm, embryonic phenotype analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific conditional KO with defined developmental phenotype\",\n      \"pmids\": [\"25907228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WNT3 inhibits cerebellar granule cell progenitor (GCP) proliferation via a non-canonical pathway activating ERK1/2 and ERK5 MAPKs (rather than β-catenin), downregulating Sonic Hedgehog target genes and Atoh1; MEK inhibition reverses WNT3's anti-proliferative effect.\",\n      \"method\": \"In vitro GCP proliferation assays, MEK inhibitor rescue, Western blot for MAPK activation, medulloblastoma mouse models\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological rescue and pathway biochemistry; single lab but multiple methods\",\n      \"pmids\": [\"24303070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Astrocyte-secreted Wnt3 promotes neural stem cell (NSC) differentiation in the adult hippocampus in a paracrine manner; decline in Wnt3-secreting astrocytes with aging impairs neurogenesis, and exercise rescues neurogenesis by increasing Wnt3 levels.\",\n      \"method\": \"In vivo analysis of Wnt3-secreting astrocytes, exercise intervention, chromatin state analysis of downstream target genes\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — paracrine secretion established with defined cellular source and target gene consequences; single lab\",\n      \"pmids\": [\"21746862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"WNT3 protein is specifically expressed in trophectoderm of human blastocysts and promotes trophoblast development; WNT3 addition or GSK3 inhibition promoted EOMES expression for trophoblast fate, via membrane-associated β-catenin rather than nuclear/canonical TCF1 targets.\",\n      \"method\": \"β-catenin gain/loss-of-function in human preimplantation embryos, WNT3 protein addition, immunostaining for lineage markers\",\n      \"journal\": \"Molecular human reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional experiments in human embryos with defined molecular readouts; single lab\",\n      \"pmids\": [\"26108805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SPIM-FCS analysis in live zebrafish embryos demonstrates that Wnt3 is associated with cholesterol-dependent membrane domains in vivo, and this association requires palmitoylation by Porcupine; inhibition of Porcupine reduces Wnt3 membrane-domain association and causes defective brain development.\",\n      \"method\": \"Single plane illumination microscopy-fluorescence correlation spectroscopy (SPIM-FCS), Porcupine inhibitor (C59), cholesterol reduction in live transgenic zebrafish\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — quantitative biophysical method in live animals with pharmacological manipulation and functional brain phenotype; multiple orthogonal approaches\",\n      \"pmids\": [\"27463143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Palmitoylation of Wnt3 at a conserved serine residue (by Porcupine) is dispensable for secretion and initial Frizzled-8 binding, but essential for Wnt3's association with ordered membrane domains and for activation of Wnt/β-catenin signaling in zebrafish embryos and mammalian cells.\",\n      \"method\": \"Site-directed mutagenesis of palmitoylation site, membrane domain organization assays, Wnt/β-catenin reporter assay in mammalian cells and zebrafish\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis combined with functional signaling and membrane organization assays in two model systems\",\n      \"pmids\": [\"31803740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Wnt3 is lipid-modified at both conserved cysteine (C80) and serine (S212) residues in zebrafish neural tissue; lipidation at either residue is sufficient for Wnt3 secretion and membrane organization, but lipid modification at S212 is indispensable for receptor interaction and signaling.\",\n      \"method\": \"Cysteine-to-alanine and serine-to-alanine point mutations (C80A, S212A), FCS-based membrane organization, secretion assays, signaling reporter\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution-level mutagenesis with functional validation at multiple levels\",\n      \"pmids\": [\"34124053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Wnt3 spreads extracellularly in the zebrafish brain via diffusion modified by tissue morphology and interactions with heparan sulfate proteoglycans (HSPG); Wnt3 binding to its receptor Frizzled1 requires the co-receptor LRP5, as demonstrated by fluorescence cross-correlation spectroscopy.\",\n      \"method\": \"Fluorescence correlation spectroscopy, fluorescence recovery after photobleaching (FRAP), fluorescence cross-correlation spectroscopy (FCCS), LRP5 knockdown\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — quantitative biophysical measurements of binding affinities and mobility in live tissue with genetic validation\",\n      \"pmids\": [\"33236989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"YAP binds to the WNT3 gene enhancer in hESCs and prevents WNT3 induction by Activin/SMAD signaling, thereby maintaining pluripotency; CRISPR/Cas9 knockout of YAP enables Activin to induce Wnt3 expression, stabilize β-catenin, and cooperate with SMADs to drive cardiac mesoderm differentiation.\",\n      \"method\": \"ChIP-seq, CRISPR/Cas9 YAP knockout, luciferase reporter, directed differentiation of hESCs\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq defines YAP occupancy at WNT3 enhancer, CRISPR KO with functional differentiation phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"29269485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WNT3 mRNA level in hESCs correlates with and is required for definitive endoderm (DE) differentiation; WNT3 knockdown inhibits and overexpression promotes DE differentiation in a WNT3 level-dependent manner.\",\n      \"method\": \"WNT3 siRNA knockdown and overexpression in multiple hESC lines, quantitative DE differentiation assays\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss- and gain-of-function with defined differentiation phenotype; single lab\",\n      \"pmids\": [\"24052941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Temozolomide methylates the WNT3 gene promoter in blood-brain barrier cells, reducing Wnt3 synthesis and disrupting Wnt3/GSK3/β-catenin signaling, which decreases β-catenin binding to the MDR1 promoter and lowers P-glycoprotein expression.\",\n      \"method\": \"Promoter methylation analysis, Wnt3 siRNA, β-catenin ChIP on MDR1 promoter, Pgp efflux assays in BBB cells\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods linking Wnt3 promoter methylation to downstream Pgp regulation; single lab\",\n      \"pmids\": [\"23771630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Flotillin-2 (Flot2) together with Wnt co-receptor Ror2 determines the number and length of Wnt3-carrying cytonemes in gastric cancer cells; cytoneme-mediated Wnt3 transport between cells promotes proliferation and cell survival.\",\n      \"method\": \"Live-cell imaging of Wnt3-cytonemes, Flot2 overexpression/knockdown, Ror2 perturbation, functional proliferation/survival assays; zebrafish Wnt8a cytoneme validation\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct imaging of cytonemes with mechanistic perturbations and cross-species validation\",\n      \"pmids\": [\"36040316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HNF4α acts as an upstream transcriptional regulator of intestinal Wnt3 expression and Paneth cell differentiation; deletion of Hnf4a in jejunal enteroids reduces Wnt3, and supplementation with Wnt3a rescues cell death and transcriptional defects.\",\n      \"method\": \"Hnf4a conditional knockout in enteroids, transcriptomics, Wnt3a supplementation rescue experiment\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with rescue by Wnt3a supplementation; single lab\",\n      \"pmids\": [\"36464209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"(Pro)renin receptor ((P)RR) inhibits NEDD4L-mediated ubiquitination of Wnt3 protein, thereby stabilizing Wnt3 and activating Wnt/β-catenin signaling to promote colorectal cancer progression.\",\n      \"method\": \"Co-immunoprecipitation of Wnt3 with NEDD4L, immunofluorescence colocalization, ATP6AP2 knock-in mice, western blot for Wnt3 ubiquitination\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP and genetic mouse model establishing (P)RR-NEDD4L-Wnt3 ubiquitination axis; single lab\",\n      \"pmids\": [\"36597142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Wnt3 is N-glycosylated at two sites (Asn90 and Asn301); mutation of Asn301 alone destabilizes Wnt3 protein, while simultaneous mutation of both sites reduces Wnt3-FZD7 binding and downstream Wnt/β-catenin signaling, as well as HCC cell proliferation and invasion.\",\n      \"method\": \"Site-directed mutagenesis of N-glycosylation sites, laser confocal microscopy for FZD7 binding, actinomycin D stability assay, western blot, cell function assays\",\n      \"journal\": \"World journal of gastrointestinal oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with functional readouts; single lab\",\n      \"pmids\": [\"38994173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TGF-β-induced EMT in HER2-overexpressing breast cancer cells upregulates Wnt3 via a Smad3-dependent pathway; Twist transcription factor directly occupies the Wnt3 promoter (validated by ChIP) to drive Wnt3 expression downstream of TGF-β.\",\n      \"method\": \"ChIP assay for Twist at Wnt3 promoter, Twist shRNA knockdown, ELISA for secreted Wnt3, western blot, Smad3 pathway inhibition\",\n      \"journal\": \"Breast cancer research and treatment\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus shRNA rescue linking TGF-β/Smad3/Twist to Wnt3 transcription; single lab\",\n      \"pmids\": [\"28337662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Wnt3 expression in Xenopus and zebrafish activates canonical Wnt/β-catenin signaling; Wnt3 and Wnt3a together are required for induction of the mid-diencephalic organizer (MDO) in zebrafish, acting in a narrow 4-hour time window; loss of Wnt3/Wnt3a leads to apoptosis within the organizer primordium, and blocking apoptosis rescues MDO formation.\",\n      \"method\": \"Morpholino knockdown of wnt3 and wnt3a, canonical Wnt pathway pharmacological activation, apoptosis blockade rescue experiment, in situ hybridization\",\n      \"journal\": \"Neural development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — combined morphant genetics with rescue experiments defining Wnt3's role and mechanism; single lab\",\n      \"pmids\": [\"22475147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Wnt3 modulates axon regeneration in adult DRG neurons by repressing mRNA translation of the transcription factor Gata4 via binding to the Gata4 3'UTR; downregulation of Wnt3 increases axon regeneration while Gata4 knockdown reverses the enhanced regeneration caused by Wnt3 downregulation.\",\n      \"method\": \"Wnt3 overexpression and knockdown in DRG neurons in vitro and in vivo, 3'UTR binding assay, Gata4 siRNA epistasis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis experiment with 3'UTR binding validation; single lab\",\n      \"pmids\": [\"29567480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZFX transcriptionally regulates WNT3 in CML stem/progenitor cells (validated by ChIP and luciferase reporter assays); WNT3 activates β-catenin/c-MYC/CCND1 signaling and mediates ZFX-dependent growth and imatinib resistance; WNT3 overexpression rescues ZFX silencing phenotypes.\",\n      \"method\": \"ChIP assay, luciferase reporter, shRNA and CRISPR/dCas9 silencing, rescue overexpression, microarray\",\n      \"journal\": \"Cellular & molecular biology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and luciferase reporter establishing ZFX as direct Wnt3 transcriptional regulator, rescue epistasis; single lab\",\n      \"pmids\": [\"37864206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human Wnt3-Frizzled1 chimera activates TCF-luciferase reporter; the Frizzled1 cytoplasmic tail (PDZ binding region) and the CRD second cysteine loop are required for Wnt3-Fz1 signaling; DKK-1 blocks the chimera's activity, implicating LRP co-receptor; the chimera promotes osteoblast and inhibits adipocyte differentiation in C3H10T1/2 cells.\",\n      \"method\": \"Wnt3-Fz1 chimera construction, deletion and point mutagenesis, TCF-luciferase reporter assay, DKK-1 inhibition, cell differentiation assays\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — structure-function mutagenesis with functional signaling readouts; single lab\",\n      \"pmids\": [\"20039315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Thalamic WNT3 secretion regulates neocortical ribosome composition by changing levels of Ribosomal protein L7 in polysome complexes during mid-neurogenesis, thereby controlling selective mRNA translation (including Foxp2 and Apc) to specify neocortical cell subtypes.\",\n      \"method\": \"Polysome fractionation, RNA sequencing, in vivo thalamic axon manipulation with WNT3 secretion analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical fractionation with in vivo manipulation; single lab\",\n      \"pmids\": [\"26245956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Wnt3 overexpression in breast cancer cells (SKBR3) activates Wnt/β-catenin signaling, increases nuclear β-catenin, transactivates EGFR expression, promotes EMT-like transition (increased N-cadherin, Twist, Slug; decreased E-cadherin), and confers trastuzumab resistance; Wnt3 siRNA reverses these effects.\",\n      \"method\": \"Stable Wnt3 transfection, siRNA knockdown, western blot, β-catenin localization, invasion assays\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — stable transfection and siRNA rescue with multiple molecular and functional readouts; single lab\",\n      \"pmids\": [\"23071104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Defective Wnt3 expression by post-pubertal Sertoli cells (achieved via shRNA transgenic mice) leads to subfertility and oligozoospermia with diminished expression of Connexin43, a gap-junctional molecule essential for germ cell development; FSH and testosterone regulate Wnt3 in pubertal Sertoli cells.\",\n      \"method\": \"Transgenic shRNA-mediated Wnt3 knockdown in Sertoli cells, spermatogenesis analysis, Connexin43 expression\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional transgenic KD with defined fertility and molecular phenotype; single lab\",\n      \"pmids\": [\"29064078\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WNT3 is a palmitoylated and N-glycosylated secreted ligand that, after lipid modification by Porcupine in the ER at conserved Cys and Ser residues, associates with cholesterol-dependent plasma membrane domains and spreads extracellularly via diffusion modulated by HSPG interactions; it binds Frizzled receptors (particularly FZD7) in a manner requiring the LRP5/6 co-receptor to activate canonical Wnt/β-catenin signaling, while also engaging non-canonical Wnt/RhoA/ROCK and MAPK/ERK pathways in context-dependent fashion; it is transcriptionally regulated by YAP, HNF4α, ZFX, and Twist (downstream of TGF-β/Smad3), and its protein stability is controlled by NEDD4L-mediated ubiquitination; in development, Wnt3 is essential for primitive streak and mesoderm formation, AER establishment, thalamic organizer induction, and adult neurogenesis, while in cancer it drives EMT, drug resistance, and proliferation through β-catenin activation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"WNT3 is a secreted Wnt family ligand essential for vertebrate axis formation, limb development, and germ layer specification, functioning through both canonical β-catenin and non-canonical (RhoA/ROCK, MAPK/ERK) signaling pathways depending on cellular context. WNT3 undergoes Porcupine-mediated palmitoylation at conserved cysteine (C80) and serine (S212) residues and N-glycosylation at Asn90 and Asn301; palmitoylation at S212 is dispensable for secretion but required for cholesterol-dependent membrane domain association, Frizzled receptor engagement, and downstream β-catenin signaling, while N-glycosylation at Asn301 is necessary for protein stability [PMID:31803740, PMID:34124053, PMID:38994173]. WNT3 binds Frizzled receptors (FZD7, FZD1) in an LRP5/6 co-receptor-dependent manner, spreads extracellularly via HSPG-modulated diffusion, and can also be transported between cells via Flotillin-2/Ror2-dependent cytonemes; its protein stability is regulated by NEDD4L-mediated ubiquitination [PMID:33236989, PMID:18313787, PMID:36040316, PMID:36597142]. Homozygous loss-of-function mutations in WNT3 cause tetra-amelia syndrome in humans [PMID:14872406].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing that Wnt3 is required for vertebrate primary axis formation resolved whether Wnt3 is essential or redundant among Wnt ligands during gastrulation.\",\n      \"evidence\": \"Wnt3-/- mouse knockout showing failure of primitive streak, mesoderm, and node formation\",\n      \"pmids\": [\"10431240\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific source of Wnt3 (epiblast vs. visceral endoderm) not resolved\", \"Downstream transcriptional targets not identified\", \"Mechanism of ligand secretion and spread unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrating that Wnt3 activates a β-catenin-independent gene expression program (including COX-2 and periostin) established that Wnt3 signals through non-canonical pathways in addition to canonical β-catenin.\",\n      \"evidence\": \"Retroviral Wnt3 expression in mammary epithelial cells; antisense β-catenin and GSK3 inhibition failing to recapitulate Wnt3 target gene induction\",\n      \"pmids\": [\"10884377\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the non-canonical pathway not determined\", \"Receptor mediating β-catenin-independent signaling unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defining Wnt3's role in AER establishment and limb patterning upstream of BMP signaling extended the gene's developmental functions beyond gastrulation to organogenesis.\",\n      \"evidence\": \"Mouse conditional β-catenin knockout in ventral ectoderm with genetic epistasis to BMP pathway\",\n      \"pmids\": [\"12569130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Wnt3 acts directly on AER precursors or indirectly via BMP not fully resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of a homozygous WNT3 nonsense mutation (Q83X) causing human tetra-amelia linked a Mendelian disease to WNT3 loss-of-function and confirmed the essential role in limb formation across species.\",\n      \"evidence\": \"Homozygosity mapping and sequencing in a consanguineous family\",\n      \"pmids\": [\"14872406\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype–phenotype spectrum for hypomorphic alleles unknown\", \"Craniofacial and urogenital phenotype mechanisms not dissected\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolving the tissue-specific requirement for Wnt3 in gastrulation showed that epiblast-expressed Wnt3, not visceral endoderm Wnt3, is essential for primitive streak induction, while visceral endoderm Wnt3 modulates timing.\",\n      \"evidence\": \"Chimeric embryo analyses and tissue-specific conditional Wnt3 knockout in mice\",\n      \"pmids\": [\"18028899\", \"25907228\", \"16289026\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals initiating Wnt3 expression in the posterior visceral endoderm not identified\", \"Quantitative threshold of Wnt3 required for streak induction unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that Wnt3 mediates cell adhesion-mediated drug resistance in myeloma via a non-canonical RhoA/ROCK pathway (insensitive to DKK-1) identified a context-specific non-canonical effector route.\",\n      \"evidence\": \"siRNA knockdown of Wnt3, Rho kinase inhibitor Y27632, DKK-1 insensitivity, co-culture adhesion assays in myeloma cells\",\n      \"pmids\": [\"17575106\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor mediating Wnt3-RhoA axis not identified\", \"Whether this pathway operates in non-cancer contexts unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Establishing that Wnt3 directly binds FZD7 and that Dkk1 antagonizes Wnt3 during head morphogenesis defined the ligand–receptor pair and a negative feedback loop regulating canonical signaling.\",\n      \"evidence\": \"Co-immunoprecipitation of Wnt3-FZD7, compound Dkk1;Wnt3 heterozygous mouse genetics\",\n      \"pmids\": [\"18313787\", \"18403408\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Wnt3-FZD7 interaction not determined\", \"Whether Wnt3-Dkk1 feedback operates in all Wnt3-expressing tissues unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating that Wnt3 regulates its own expression via β-catenin during gastrulation maintenance and drives EMT/trastuzumab resistance in breast cancer consolidated Wnt3's role as both a developmental autoregulatory signal and an oncogenic driver.\",\n      \"evidence\": \"Conditional epiblast Wnt3 KO with molecular marker analysis; stable Wnt3 transfection in SKBR3 breast cancer cells with β-catenin nuclear localization, EGFR transactivation, and EMT marker analysis\",\n      \"pmids\": [\"23085236\", \"23071104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Autoregulatory enhancer elements not mapped\", \"Whether Wnt3-driven EMT is reversible unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of Wnt3's non-canonical MAPK/ERK pathway activation in cerebellar granule cell progenitors and its role in definitive endoderm differentiation of hESCs showed that Wnt3 dosage specifies distinct cell fates through pathway selection.\",\n      \"evidence\": \"MEK inhibitor rescue in GCP proliferation assays; WNT3 knockdown/overexpression in multiple hESC lines with DE differentiation quantification\",\n      \"pmids\": [\"24303070\", \"24052941\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of pathway selection (canonical vs. MAPK) at the receptor level not known\", \"Whether Wnt3 and Wnt3a have overlapping roles in DE specification not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Biophysical demonstration that Wnt3 associates with cholesterol-dependent membrane domains in a Porcupine/palmitoylation-dependent manner in vivo resolved how lipid modification controls Wnt3 membrane behavior and signaling competence.\",\n      \"evidence\": \"SPIM-FCS in live zebrafish embryos with Porcupine inhibitor C59 and cholesterol reduction\",\n      \"pmids\": [\"27463143\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific lipid species (palmitoleate vs. palmitate) is added not resolved by imaging\", \"Whether membrane domain association is required for all Wnt3 signaling outputs unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mutagenesis of the conserved serine palmitoylation site demonstrated that this modification is dispensable for Wnt3 secretion and initial Frizzled binding but essential for membrane domain organization and signaling activation, separating secretion from signaling competence.\",\n      \"evidence\": \"Site-directed mutagenesis of Ser palmitoylation site with β-catenin reporter assays in mammalian cells and zebrafish embryos\",\n      \"pmids\": [\"31803740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mechanism by which palmitoylation enables signaling not determined\", \"Whether cysteine-site lipidation has independent signaling functions not fully addressed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Quantitative biophysical measurement of Wnt3 extracellular spread showed HSPG-modulated diffusion (not free diffusion alone) and established that LRP5 co-receptor is required for Wnt3-Frizzled1 binding, defining the minimal receptor complex.\",\n      \"evidence\": \"FCS, FRAP, and FCCS in live zebrafish brain tissue with LRP5 knockdown\",\n      \"pmids\": [\"33236989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other co-receptors (LRP6, Ror2) substitute for LRP5 in Wnt3 binding not tested\", \"Binding affinities for different Frizzled family members not compared\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Systematic mutagenesis of both lipidation sites (C80, S212) showed that either is sufficient for secretion and membrane organization, but S212 lipidation is specifically indispensable for receptor interaction and signaling, establishing a hierarchy of lipid modifications.\",\n      \"evidence\": \"C80A and S212A point mutations with FCS-based membrane assays, secretion assays, and signaling reporters in zebrafish neural tissue\",\n      \"pmids\": [\"34124053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of differentially lipidated Wnt3 not available\", \"Whether the lipidation hierarchy applies to other Wnt family members unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of YAP as a direct repressor at the WNT3 enhancer and Twist/Smad3 as activators at the WNT3 promoter defined upstream transcriptional logic controlling WNT3 expression in pluripotency exit and EMT.\",\n      \"evidence\": \"ChIP-seq for YAP in hESCs with CRISPR KO; ChIP for Twist at Wnt3 promoter with Smad3 inhibition in breast cancer cells\",\n      \"pmids\": [\"29269485\", \"28337662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether YAP and Twist compete at overlapping regulatory elements unknown\", \"Epigenetic regulation of the WNT3 locus not fully mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that Flotillin-2 and Ror2 regulate Wnt3-carrying cytonemes and that HNF4α is an upstream transcriptional regulator of intestinal Wnt3 expanded the mechanisms of Wnt3 transport and tissue-specific transcriptional control.\",\n      \"evidence\": \"Live-cell imaging of cytonemes with Flot2/Ror2 perturbation in gastric cancer cells; Hnf4a conditional knockout in jejunal enteroids with Wnt3a rescue\",\n      \"pmids\": [\"36040316\", \"36464209\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of cytonemes vs. diffusion to Wnt3 spread in vivo not quantified\", \"Whether HNF4α directly binds the Wnt3 promoter not shown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Establishing that (P)RR stabilizes Wnt3 protein by inhibiting NEDD4L-mediated ubiquitination and that ZFX directly transactivates WNT3 in CML stem cells defined post-translational and transcriptional regulatory axes in cancer.\",\n      \"evidence\": \"Co-IP of Wnt3 with NEDD4L, ATP6AP2 knock-in mice; ChIP and luciferase for ZFX at WNT3 promoter with rescue overexpression\",\n      \"pmids\": [\"36597142\", \"37864206\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NEDD4L ubiquitination sites on Wnt3 not mapped\", \"Whether ZFX regulation of WNT3 operates outside CML not tested\", \"Whether (P)RR-mediated stabilization occurs before or after Wnt3 secretion not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrating that N-glycosylation at Asn301 is required for Wnt3 protein stability and that dual glycosylation (Asn90/Asn301) is needed for FZD7 binding and signaling defined a second class of essential post-translational modification for Wnt3 function.\",\n      \"evidence\": \"Site-directed mutagenesis of N-glycosylation sites with confocal FZD7 binding assay, stability assays, and HCC cell function assays\",\n      \"pmids\": [\"38994173\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Glycan structures at each site not characterized\", \"Whether glycosylation affects Wnt3 interaction with LRP5/6 not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of Wnt3-Frizzled-LRP complex assembly, the mechanism governing canonical vs. non-canonical pathway selection at the receptor level, and whether cytoneme- vs. diffusion-mediated transport predominates in specific tissues remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of Wnt3 in complex with its receptor\", \"Pathway selection mechanism between canonical and non-canonical routes not defined\", \"In vivo quantitative comparison of transport modes lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 3, 8, 15, 17, 24]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [3, 4, 11, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [12, 14, 17, 21]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [14, 15, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 4, 8, 11, 15, 17, 23, 29]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 2, 7, 9, 10, 26]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [4, 23, 28, 31]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"FZD7\",\n      \"FZD1\",\n      \"LRP5\",\n      \"NEDD4L\",\n      \"FLOT2\",\n      \"ROR2\",\n      \"DKK1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}