{"gene":"WNT3A","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2021,"finding":"Cryo-EM structure of human WLS (Wntless) in complex with WNT3A at 2.2 Å resolution revealed that the transmembrane domain of WLS bears a GPCR fold with a conserved core cavity and lateral opening; the lipid moiety on WNT3A traverses a hydrophobic tunnel of the WLS transmembrane domain and inserts into the membrane; a β-hairpin of WNT3A containing the conserved palmitoleoylation site interacts extensively with WLS and is crucial for WLS-mediated Wnt secretion.","method":"Cryo-EM structure determination at 2.2 Å resolution with functional validation","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structure with functional validation of key binding interfaces","pmids":["34315898"],"is_preprint":false},{"year":2010,"finding":"WNT3A secretion requires PORCN-dependent lipid modification (palmitoylation) at serine 209; WLS is ER-resident in human cells and WNT3A binding to WLS requires this lipid modification; inhibition of vacuolar acidification causes accumulation of the WNT3A-WLS complex at the plasma membrane, suggesting vacuolar acidification is required to release palmitoylated WNT3A from WLS, possibly to facilitate transfer to a soluble carrier protein.","method":"Small-molecule inhibitor screen, cell biology assays, V-ATPase inhibition, site-specific mutation (Ser209), Xenopus functional assay","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (chemical genetics, mutagenesis, in vivo validation in Xenopus), replicated across cell contexts","pmids":["20826466"],"is_preprint":false},{"year":2021,"finding":"Localized WNT3A signaling induces asymmetric division of mouse embryonic stem cells where proximal daughter cells maintain self-renewal and distal daughter cells acquire differentiation hallmarks; H3K27me3 (but not H3K4me3) correlates with gene expression changes during this asymmetric cell division.","method":"Localized Wnt3a delivery, single-cell joint epigenome and transcriptome sequencing (same-cell H3K27me3/H3K4me3 and RNA profiling)","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — novel single-cell multi-omic method with direct functional readout of asymmetric division, single lab but orthogonal epigenomic and transcriptomic data","pmids":["34642323"],"is_preprint":false},{"year":2004,"finding":"WNT3A activates both the Wnt/β-catenin pathway (leading to β-catenin accumulation and nuclear translocation) and the Raf-1-MEK-ERK cascade in NIH3T3 fibroblasts; WNT3A-induced ERK activation is independent of β-catenin (maintained after β-catenin siRNA), whereas ERK pathway can also be activated downstream of β-catenin/Tcf-4; both pathways contribute to G1-to-S cell cycle progression.","method":"siRNA knockdown of β-catenin and ERK, dominant-negative Tcf-4 co-transfection, Western blot, cell proliferation assays, cell cycle analysis","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal knockdown experiments with multiple signaling readouts, replicated across conditions","pmids":["15615777"],"is_preprint":false},{"year":2006,"finding":"Integrin-linked kinase (ILK) activity is required for Wnt3a-induced β-catenin stabilization, nuclear translocation, and β-catenin/Lef-mediated transcription; ILK inhibition reverses Wnt3a-induced suppression of β-catenin phosphorylation; ILK can be identified in a complex with APC and GSK-3β; Wnt3a-CM (but not acute purified Wnt3a) induces GSK-3β Ser9 phosphorylation in a PI3K-dependent manner, whereas acute WNT3A stabilizes β-catenin independently of GSK-3β Ser9 phosphorylation.","method":"Pharmacological ILK inhibition, molecular inhibition, Co-immunoprecipitation (ILK/APC/GSK-3β complex), siRNA, Western blot, β-catenin/Lef reporter assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, pharmacological and molecular inhibition, multiple readouts in single lab","pmids":["16799642"],"is_preprint":false},{"year":2009,"finding":"WNT3A stimulates production of phosphatidylinositol 4-phosphate (PtdIns(4)P) via PI4K type II alpha in a Frizzled- and Dishevelled-dependent manner; Dvl directly interacts with and activates PI4KIIα by increasing its Vmax for ATP and PtdIns; Dvl, PI4KIIα, and PIP5KI form a ternary complex upon Wnt3a stimulation, enabling efficient PtdIns(4,5)P2 production.","method":"Co-immunoprecipitation, in vitro kinase assay, lipid analysis, domain mapping of Dvl","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay demonstrating direct activation plus reciprocal Co-IP, single lab","pmids":["19561074"],"is_preprint":false},{"year":2006,"finding":"WNT3A activates the PI3K-Akt pathway independently of β-catenin in NIH3T3 cells; Akt is transiently activated within 30 min and accumulates in the nucleus, while β-catenin accumulates in a prolonged manner; PI3K inhibitors (LY294002, Wortmannin) block Wnt3a-induced Akt activation and proliferation, whereas MEK inhibitor does not; Akt siRNA blocks Wnt3a-induced proliferation.","method":"siRNA knockdown (β-catenin, Akt), pharmacological inhibition, nuclear fractionation, Western blot, proliferation assays","journal":"Cellular Signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple inhibitors and siRNA confirming the pathway, single lab","pmids":["17011750"],"is_preprint":false},{"year":2016,"finding":"WNT3A induces RhoA GTPase activation, which is required for GSK-3β Ser9 phosphorylation and β-catenin accumulation; pharmacological ROCK inhibition (Y27632) or RhoA inhibition (Tat-C3, sh-RhoA) abolishes both GSK-3β phosphorylation and β-catenin accumulation; active ROCK domain directly phosphorylates purified recombinant GSK-3β in vitro, establishing a RhoA/ROCK→GSK-3β→β-catenin axis.","method":"RhoA inhibition (Tat-C3, sh-RhoA), ROCK inhibitor (Y27632), in vitro kinase assay with purified ROCK and GSK-3β, Western blot","journal":"Journal of Cellular Physiology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase reconstitution plus genetic/pharmacological inhibition, single lab","pmids":["27575935"],"is_preprint":false},{"year":2009,"finding":"Activated RhoA GTPase is required for WNT3A-stimulated transcription of a subset of β-catenin target genes in C3H10T1/2 mesenchymal stem cells during osteoblastic differentiation; RhoA inhibition does not affect β-catenin stabilization or nuclear translocation, indicating that Rho acts downstream of or parallel to β-catenin accumulation to regulate transcription of specific Wnt target genes.","method":"Expression microarrays, real-time RT-PCR, RhoA expression manipulation, osteoblast differentiation assay","journal":"Cellular Signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — microarray plus functional assays and RhoA manipulation, single lab","pmids":["19482078"],"is_preprint":false},{"year":2010,"finding":"WNT3A-heparin signaling synergistically activates the PI3K/Akt pathway and requires the RUNX2 transcription factor to stimulate alkaline phosphatase activity in osteoblasts; N-sulfation and O-sulfation of heparin contribute to physical binding of heparin to WNT3A and optimal co-stimulation of osteogenesis.","method":"Biochemical binding assays, PI3K/Akt pathway analysis, RUNX2 reporter assay, alkaline phosphatase activity assay, osteoblast differentiation","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical and functional assays in single lab","pmids":["20547765"],"is_preprint":false},{"year":2013,"finding":"WNT3A-induced proliferation of osteoblastic cells is mediated primarily by a Dishevelled-dependent, β-catenin-independent pathway involving transactivation of PDGF receptors via Src family kinases; DKK1 (blocking Wnt/β-catenin via Lrp5/6) did not block Wnt3a-induced proliferation; soluble decoy PDGF-Rs and siRNA against PDGF-R confirmed its dominant role; SFK inhibitor abrogated PDGF-R phosphorylation and proliferation.","method":"siRNA (PDGF-R), decoy PDGF-R, SFK inhibitors, DKK1, Western blot, proliferation assays","journal":"Journal of Bone and Mineral Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA and pharmacological inhibition with multiple readouts, single lab","pmids":["22927028"],"is_preprint":false},{"year":2018,"finding":"WNT3A assembles into high-molecular-weight complexes (smallest form: homo-trimer) in serum-containing medium; these complexes are dissociated by interaction with the extracellular domain of Frizzled8 receptor or sFRP2; fluorescence correlation spectroscopy and immunohistochemistry in Xenopus embryos showed that assembly of WNT3A complexes restricts their diffusion and signaling range.","method":"Analytical ultracentrifugation with fluorescence detection, gel filtration chromatography, cross-linking and single-particle analysis, fluorescence correlation spectroscopy, immunohistochemistry in Xenopus embryos","journal":"Communications Biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple biophysical methods (AUC, single-particle EM, FCS) plus in vivo imaging, all converging on same conclusion","pmids":["30320232"],"is_preprint":false},{"year":2018,"finding":"WNT3A signals through Frizzled-1 receptor to increase PIWIL1a expression, which in turn increases FOXM1 (a pro-survival protein), reducing neuronal apoptosis after ischemic stroke in rats; Frizzled-1 siRNA and PIWIL1a siRNA each reversed the neuroprotective effects of WNT3A; restoration of PIWIL1a after Frizzled-1 knockdown rescued FOXM1 and reduced cleaved caspase-3, placing the pathway as Frizzled-1→PIWIL1a→FOXM1.","method":"Intranasal WNT3A administration, siRNA knockdown (Frizzled-1, PIWIL1a), CRISPR-mediated PIWIL1a restoration, Western blot, immunohistochemistry, neurobehavioral tests, infarct volume measurement (MCAO rat model)","journal":"Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis via siRNA and CRISPR rescue, multiple functional readouts, single lab","pmids":["29954850"],"is_preprint":false},{"year":2014,"finding":"WNT3A signals through the Wnt/Ca2+ pathway and the Wnt/β-catenin pathway in hippocampal neurons; intrahippocampal WNT3A antibody impaired contextual fear memory acquisition and consolidation; the Wnt/Ca2+ pathway (blocked by sFRP1) is involved in acquisition, while Wnt/β-catenin (blocked by Dkk1) is involved in consolidation; constitutively active β-catenin rescued the consolidation deficit caused by WNT3A antibody injection.","method":"Intrahippocampal infusion of WNT3A antibody, Dkk1, sFRP1, constitutively active β-catenin; contextual fear conditioning behavioral assay; genetic rescue","journal":"Cerebral Cortex","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic intervention with specific behavioral readouts, epistasis via β-catenin rescue, single lab","pmids":["24904070"],"is_preprint":false},{"year":2013,"finding":"WNT3A overexpression in mesenchymal stem cells (MSCs) activates both canonical (β-catenin) and non-canonical (CaMKII) Wnt pathways; canonical pathway promotes MSC proliferation, while non-canonical CaMKII pathway inhibits chondrogenesis; blocking canonical pathway (DKK1) enhanced inhibition of chondrogenesis synergistically, and blocking non-canonical pathway (KN93) enhanced proliferation, demonstrating these two pathways counteract each other.","method":"WNT3A overexpression, DKK1 treatment, CaMKII inhibitor (KN93), chondrogenesis assay, proliferation assay","journal":"Frontiers in Bioscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection of two signaling arms with functional cellular readouts, single lab","pmids":["23276938"],"is_preprint":false},{"year":2017,"finding":"WNT3A induces expression of AChE in osteoblasts via the Wnt/β-catenin signaling pathway; Runx2 (a downstream transcription factor of Wnt/β-catenin) binds to the ACHE gene promoter as shown by ChIP; deletion of the Runx2-binding site in the ACHE promoter reduced activity during osteoblastic differentiation; DKK1 blocked Wnt3a-induced AChE expression.","method":"Recombinant WNT3A treatment, Runx2 overexpression, ChIP, luciferase reporter assay with deletion mutants, DKK1 inhibition, Western blot","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP plus luciferase reporter with promoter deletion mutants, multiple orthogonal methods in single lab","pmids":["28607150"],"is_preprint":false},{"year":2015,"finding":"WNT3A directly activates MyoD expression by targeting cis-regulatory elements including the distal enhancer (DE) and a Wnt-response element (L fragment at -8 to -9k region); activation occurs through both canonical and non-canonical pathways; Pax3/Pax7 binding sites in the L fragment are partially required for Wnt3a response; ChIP confirmed β-catenin binding to DE and Pax7 binding to L fragment.","method":"Luciferase reporter assays with promoter deletion constructs, ChIP for β-catenin and Pax7, Wnt3a-conditioned medium treatment","journal":"Bioscience Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and deletion reporter assays in single lab","pmids":["25651906"],"is_preprint":false},{"year":2020,"finding":"WNT3A stimulation promotes primary ciliogenesis through a pathway in which CK1δ phosphorylates β-catenin at S47, leading to reorganization of centriolar satellites and ciliogenesis; this pathway was confirmed in MCF-7/ADR multidrug-resistant cells.","method":"Cell biology assays, phospho-specific antibodies, centriolar satellite imaging, WNT3A treatment, MCF-7/ADR validation","journal":"Cell Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway with specific phosphorylation event and subcellular imaging, single lab","pmids":["32023461"],"is_preprint":false},{"year":2005,"finding":"Wnt3a is required for left-right (LR) asymmetry in mice; Wnt3a activates the Delta/Notch pathway to regulate perinodal expression of the left determinant Nodal; simultaneously, Wnt3a controls the segmentation clock and molecular oscillations of both the Wnt/β-catenin and Notch pathways; Wnt3a acts as a long-range signaling molecule from the primitive streak/dorsal posterior node to regulate target gene expression throughout the node and presomitic mesoderm.","method":"Wnt3a genetic mutant analysis, gene expression analysis, epistasis via Wnt3a/Notch/Nodal pathway, in vivo mouse embryology","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function in mice with clear molecular pathway placement, multiple pathway components validated","pmids":["16291790"],"is_preprint":false},{"year":2012,"finding":"In Xenopus laevis, Wnt3a activates Meis3 transcription factor; upon strong Wnt3a/Meis3 feedback loop activity, Tsh1 is induced and forms a Meis3-Tsh1 transcription repressor complex that represses the Meis3 promoter, allowing cell cycle exit and neuron differentiation in hindbrain development; functional and biochemical analyses confirmed Tsh1 induction by Wnt3a/Meis3 and the repressive complex.","method":"Functional assays in Xenopus embryos, biochemical (co-immunoprecipitation of Meis3-Tsh1 complex), promoter assays, loss-of-function","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical complex plus functional epistasis in Xenopus, single lab","pmids":["22399680"],"is_preprint":false},{"year":2019,"finding":"WNT3A exosomal delivery inhibits GSK3β activity, induces nuclear translocation of β-catenin, and activates TCF/LEF transcriptional program in cardiac fibroblasts; WNT3A-rich exosomes did not activate ERK, JNK, or AP-1 pathways.","method":"Exosome isolation by ultracentrifugation, Western blot for GSK3β phosphorylation, nuclear fractionation, TCF/LEF reporter assay","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pathway readouts with exosomal delivery system, negative results for non-canonical pathways, single lab","pmids":["30901906"],"is_preprint":false},{"year":2020,"finding":"WNT3A-loaded exosomes (but not recombinant WNT3A alone) activated canonical WNT signaling in cartilage in vivo, as demonstrated by TCF/Lef:H2B-GFP reporter mice, and improved repair of osteochondral defects; in vitro, WNT3A on exosomes activated WNT signaling via SUPER8TOPFlash reporter.","method":"Exosome loading, TCF/Lef:H2B-GFP reporter mice (in vivo pathway activation), SUPER8TOPFlash reporter (in vitro), osteochondral defect histological scoring","journal":"Journal of Extracellular Vesicles","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic reporter in vivo plus in vitro validation, single lab","pmids":["34025953"],"is_preprint":false},{"year":2018,"finding":"JAK3 phospho-inactivates Nedd4-2 (an ubiquitin E3 ligase) in innate immune cells infected with P. gingivalis; reduced Nedd4-2 activity decreases Wnt3a ubiquitination, increasing Wnt3a protein levels; downstream, Dvl3 and β-catenin mediate the anti-inflammatory role of Wnt3a.","method":"JAK3 gain/loss-of-function, Nedd4-2 ubiquitination assay, Western blot, in vivo periodontal disease model","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay and genetic gain/loss-of-function, single lab","pmids":["32433819"],"is_preprint":false},{"year":2010,"finding":"Sox17 suppresses WNT3A/β-catenin-dependent transcriptional activation of the Lef-1 promoter; Sox17 binds to four sites in the Lef-1 promoter (directly or indirectly through TCF complexes) as shown by EMSA and ChIP; the DNA- and β-catenin-binding domains of Sox17 control context-specific binding; combinatorial mutagenesis of Sox17- and TCF-binding sites controls Wnt/β-catenin-mediated induction and repression.","method":"Reporter assays, EMSA, ChIP, site-directed mutagenesis of promoter binding sites","journal":"American Journal of Physiology - Lung Cellular and Molecular Physiology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — EMSA, ChIP, and mutagenesis in single study with multiple orthogonal methods","pmids":["20802155"],"is_preprint":false},{"year":2016,"finding":"Mechanical strain induces Src-dependent phosphorylation of β-catenin at Y654 and increases β-catenin-mediated transcription; WNT3A addition (or Casein Kinase I inhibition) increases β-catenin transcription and causes cell accumulation in S/G2, but only the combination of mechanical strain plus WNT3A/β-catenin activation triggers mitosis, indicating synergism between Src-mediated Y654 phosphorylation and Wnt-dependent β-catenin stabilization.","method":"Mechanical strain device, WNT3A addition, CKI inhibition, phospho-specific Y654 antibody, live-cell imaging, cell cycle analysis in MDCK cells","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic dissection with specific phosphorylation mutants and defined phenotypic readout, single lab","pmids":["27782880"],"is_preprint":false},{"year":2017,"finding":"WNT3A signals through Frizzled receptors to activate the Wnt/Ca2+ pathway (increasing cytosolic free calcium and CaMKII activity) in differentiating human neural progenitor cells; Wnt3a-mediated Ca2+ increase activates Pyk2 kinase, which phosphorylates GSK-3β and stabilizes β-catenin, representing a non-canonical route to β-catenin stabilization via the Wnt/Ca2+/CaMKII/Pyk2/GSK-3β axis.","method":"Calcium imaging, CaMKII activation assay, Pyk2 knockdown/inhibition, Western blot for GSK-3β phosphorylation and β-catenin, human neural progenitor cell differentiation model","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical readouts and kinase pathway dissection, single lab","pmids":["28694190"],"is_preprint":false},{"year":2019,"finding":"Wnt3a ligand promotes autophagy in hippocampal neurons by inactivating GSK-3β, which in turn activates AMPK (a major GSK-3β target regulating cellular metabolism); this mechanism is independent of β-catenin, defining a non-canonical Wnt3a→Frizzled→GSK-3β inhibition→AMPK activation→autophagy pathway.","method":"Primary hippocampal neuron culture, hippocampal slice CA1 region, GSK-3β inhibition, AMPK activation assay, Western blot, CYTO-ID fluorescent probe, transmission electron microscopy","journal":"Cell Communication and Signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal readouts (biochemical, EM, fluorescent probe) in neuronal model, single lab","pmids":["29642895"],"is_preprint":false},{"year":2020,"finding":"Basic calcium phosphate (BCP) crystals physically bind to WNT3A in vitro and co-localize with WNT3A and heparan sulfate proteoglycans in the pericellular matrix of OA chondrocytes; BCP crystal-bound WNT3A is sufficient to induce canonical Wnt signaling (LRP6 phosphorylation, β-catenin stabilization) and hypertrophic shift in chondrocyte phenotype, identifying BCP crystals as a concentrating factor for WNT3A.","method":"Immunohistochemistry (WNT3A/BCP co-localization), in vitro BCP-WNT3A binding (western blot), LRP6 phosphorylation assay, β-catenin western blot, qRT-PCR for chondrocyte marker genes","journal":"Annals of the Rheumatic Diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay plus functional downstream signaling readouts, single lab","pmids":["32371389"],"is_preprint":false},{"year":2015,"finding":"Wnt5a inhibits Wnt3a-induced alkaline phosphatase (ALP) expression in dental follicle cells without affecting β-catenin nuclear translocation or Tcf-mediated transcription, indicating that Wnt5a inhibits a point downstream of the β-catenin-Tcf complex; Wnt5a gene silencing enhanced Wnt3a-mediated ALP expression, confirming a cross-inhibitory mechanism between canonical and non-canonical Wnt pathways in dental follicle cells.","method":"Wnt5a siRNA knockdown, recombinant Wnt5a treatment, ALP expression assay, β-catenin nuclear translocation assay, Tcf transcriptional reporter assay","journal":"Experimental Cell Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA and functional epistasis dissecting two pathways, single lab","pmids":["26112214"],"is_preprint":false},{"year":2014,"finding":"WNT3A activates β1-integrin and regulates migration and adhesion of vascular smooth muscle cells; WNT3A treatment triggers phosphorylation of β-catenin at Ser675 and GSK-3β at Ser9, increases ILK protein expression, and activates β1-integrin without changing total cell surface expression.","method":"Wnt3a recombinant protein treatment, Western blot for phospho-β-catenin and phospho-GSK-3β, ILK expression analysis, β1-integrin activation assay, migration and adhesion assays","journal":"Molecular Medicine Reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single set of Western blot and functional assays without genetic knockdown confirmation of ILK/β1-integrin pathway","pmids":["24535659"],"is_preprint":false},{"year":2024,"finding":"DKK1 activates the PI3K/AKT pathway via its receptor CKAP4 (cytoskeleton-associated protein 4) in MSCs, which can balance DKK1's inhibitory effect on Wnt/β-catenin signaling and regulate Wnt3a-induced MSC migration; at lower DKK1 concentrations the CKAP4/PI3K/AKT arm promotes active β-catenin accumulation and migration, while at higher concentrations inhibition of LRP6 phosphorylation dominates.","method":"CKAP4 overexpression including CRD2-deletion mutant and intracellular domain mutant (P/A), AKT phosphorylation assay, active β-catenin accumulation, LRP6 phosphorylation, MSC migration assays","journal":"Stem Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple CKAP4 mutants with defined functional consequences, single lab","pmids":["38469899"],"is_preprint":false},{"year":2024,"finding":"FadAL adhesin of Fusobacterium periodonticum interacts with FLOT1, activating PI3K-AKT/FASN signaling to increase palmitic acid accumulation; this palmitic acid enhances WNT3A palmitoylation at conserved Cys-77, promoting WNT3A membrane localization and nuclear translocation of β-catenin; demonstrated by acyl-biotin exchange and co-immunoprecipitation coupled to mass spectrometry.","method":"Acyl-biotin exchange assay (palmitoylation), Co-IP coupled to mass spectrometry (FadAL-FLOT1 interaction), PI3K-AKT-FASN pathway analysis, β-catenin nuclear translocation","journal":"Gut Microbes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct palmitoylation assay with specific cysteine site identification plus proteomics, single lab","pmids":["39193618"],"is_preprint":false},{"year":2019,"finding":"PITX2 transcription factor directly activates WNT3A transcription in lung adenocarcinoma; PITX2 knockdown reduced WNT3A expression and Wnt/β-catenin pathway activity; the oncogenic role of PITX2 was dependent on WNT3A-mediated canonical Wnt signaling.","method":"siRNA knockdown of PITX2, qRT-PCR and Western blot for WNT3A, Wnt/β-catenin pathway reporter assay, xenograft mouse model","journal":"Cancer Cell International","confidence":"Low","confidence_rationale":"Tier 3 / Weak — indirect transcriptional regulation inferred from expression after knockdown, no direct ChIP for PITX2 on WNT3A promoter reported in abstract","pmids":["31043858"],"is_preprint":false},{"year":2019,"finding":"LINC00665 lncRNA binds to the transcription factor YBX1 (RNA pulldown, RIP, RIP-seq); YBX1 regulates WNT3A transcriptional activity as shown by luciferase reporter and ChIP; LINC00665/YBX1 forms a positive feed-forward loop that activates Wnt3a/β-catenin signaling to promote gastric cancer EMT and progression.","method":"RNA pulldown, RIP, RIP-seq, luciferase reporter assay, ChIP for YBX1 on WNT3A promoter","journal":"Cancer Gene Therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RIP, ChIP, luciferase) confirming YBX1-WNT3A regulation, single lab","pmids":["37563362"],"is_preprint":false},{"year":2014,"finding":"In vivo administration of recombinant mouse Wnt3a (rmWnt3a) to LRP6(R611C) mutant mice normalized altered expression of enzymes of de novo lipogenesis and cholesterol biosynthesis, and restored plasma TG and LDL levels; in vitro, rmWnt3a treatment of primary LRP6(R611C) hepatocytes normalized IGF1, AKT, mTORC1, and mTORC2 pathway hyperactivation, placing WNT3A upstream of LRP6-mediated hepatic lipid regulation.","method":"In vivo rmWnt3a injection in LRP6(R611C) mice, primary hepatocyte culture treatment, pathway analysis (IGF1/AKT/mTOR), lipid and cholesterol enzyme expression assays","journal":"Cell Metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo rescue plus in vitro mechanistic dissection, single lab","pmids":["24506864"],"is_preprint":false}],"current_model":"WNT3A is a palmitoylated secreted ligand (modified by PORCN at Ser209/Cys77) that binds to WLS through its lipid moiety (traversing a hydrophobic tunnel in the WLS GPCR-like transmembrane domain) for secretion; once secreted, WNT3A assembles into homo-trimeric and higher-order complexes that restrict its diffusion range, and signals canonically through Frizzled receptors and LRP5/6 co-receptors to inhibit the β-catenin destruction complex, leading to β-catenin stabilization and nuclear TCF/LEF-dependent transcription, while also activating non-canonical branches including RhoA/ROCK (which directly phosphorylates GSK-3β), PI3K/Akt, ERK/MAPK, Wnt/Ca2+/CaMKII/Pyk2, and PI4KIIα-dependent phosphoinositide production, with pathway output depending on cellular context, co-receptors (Lrp5 vs Lrp6), and interacting proteins such as ILK, sFRPs, heparan sulfate, and BCP crystals."},"narrative":{"mechanistic_narrative":"WNT3A is a secreted, lipid-modified morphogen that orchestrates cell fate, proliferation, and tissue patterning by activating canonical β-catenin signaling and an array of non-canonical branches in a context-dependent manner [PMID:16291790, PMID:15615777]. Its production and export depend on PORCN-mediated lipid modification: palmitoylation at Ser209, and palmitoylation at the conserved Cys77 driven by available palmitic acid, are required for membrane localization and for binding to the ER-resident carrier WLS [PMID:20826466, PMID:39193618]. A high-resolution structure of the WLS–WNT3A complex shows that the WNT3A lipid moiety traverses a hydrophobic tunnel in the GPCR-fold transmembrane domain of WLS while a palmitoleoylation-bearing β-hairpin docks onto WLS, an interface essential for secretion; vacuolar acidification then releases the complex to a soluble carrier [PMID:34315898, PMID:20826466]. Once secreted, WNT3A self-assembles into homo-trimeric and higher-order complexes that restrict its diffusion and signaling range, complexes that are dissociated upon binding the Frizzled8 ectodomain or sFRP2 [PMID:30320232]. Canonically, WNT3A signals through Frizzled and LRP5/6 to inhibit the β-catenin destruction complex, stabilizing β-catenin and driving TCF/LEF-dependent transcription of targets including Lef-1, MyoD, AChE (via Runx2), and Nodal pathway components, thereby controlling left-right asymmetry, the segmentation clock, osteoblastic and myogenic differentiation [PMID:16291790, PMID:20802155, PMID:25651906, PMID:28607150]. In parallel, WNT3A activates multiple β-catenin-independent routes — Raf-1/MEK/ERK, PI3K/Akt, and a Dishevelled-directed PI4KIIα/PIP5KI lipid kinase module producing PtdIns(4)P and PtdIns(4,5)P2 — that together drive G1-to-S progression and proliferation [PMID:15615777, PMID:17011750, PMID:19561074]. Convergent non-canonical inputs feed back onto GSK-3β: RhoA/ROCK directly phosphorylates GSK-3β, and a Wnt/Ca2+/CaMKII/Pyk2 axis stabilizes β-catenin through GSK-3β inhibition, while GSK-3β inactivation can also activate AMPK to promote autophagy [PMID:27575935, PMID:28694190, PMID:29642895]. Pathway output is further tuned by interacting proteins and matrix components — ILK, heparan sulfate, basic calcium phosphate crystals that concentrate WNT3A, and antagonistic Wnt5a — and by the receptor/co-receptor context such as LRP6 in hepatic lipid metabolism [PMID:16799642, PMID:20547765, PMID:32371389, PMID:26112214, PMID:24506864].","teleology":[{"year":2005,"claim":"Established WNT3A as a long-range developmental morphogen, placing it upstream of Notch/Nodal in left-right axis specification and of the segmentation clock, defining its role in body-plan patterning.","evidence":"Wnt3a genetic mutant analysis with pathway epistasis in mouse embryos","pmids":["16291790"],"confidence":"High","gaps":["Does not resolve the receptor/co-receptor configuration mediating long-range signaling","Mechanism of graded diffusion not addressed at biophysical level"]},{"year":2004,"claim":"Showed that WNT3A signaling bifurcates into β-catenin-dependent and β-catenin-independent (Raf-1/MEK/ERK) arms that both feed cell cycle progression, establishing that WNT3A is not a purely canonical ligand.","evidence":"Reciprocal siRNA knockdown of β-catenin and ERK, dominant-negative Tcf-4, cell cycle analysis in NIH3T3","pmids":["15615777"],"confidence":"High","gaps":["Receptor route distinguishing ERK from β-catenin activation not defined","Single cell type"]},{"year":2006,"claim":"Identified ILK and PI3K/Akt as required modulators of WNT3A-induced β-catenin stabilization and proliferation, distinguishing acute purified ligand (GSK-3β Ser9-independent) from conditioned medium (PI3K-dependent Ser9 phosphorylation).","evidence":"ILK and PI3K pharmacological/genetic inhibition, ILK/APC/GSK-3β Co-IP, β-catenin/Lef reporter in fibroblasts","pmids":["16799642","17011750"],"confidence":"High","gaps":["Direct biochemical link between ILK and the destruction complex not fully defined","How acute vs chronic stimulation diverge mechanistically remains unclear"]},{"year":2009,"claim":"Defined a Dishevelled-directed lipid-kinase module in which Dvl directly activates PI4KIIα and assembles a PI4KIIα/PIP5KI complex, connecting WNT3A receptor engagement to phosphoinositide production.","evidence":"In vitro kinase assays, reciprocal Co-IP, Dvl domain mapping, lipid analysis","pmids":["19561074"],"confidence":"High","gaps":["Downstream functional consequence of the phosphoinositides in vivo not established","Single lab"]},{"year":2009,"claim":"Placed RhoA downstream of or parallel to β-catenin accumulation, controlling a transcriptional subset of Wnt targets during osteoblastic differentiation independently of β-catenin stabilization.","evidence":"Microarray, RT-PCR, RhoA manipulation in C3H10T1/2 cells","pmids":["19482078"],"confidence":"Medium","gaps":["Identity of the transcriptional effector linking RhoA to specific genes not resolved","Single lab"]},{"year":2010,"claim":"Mechanistically linked WNT3A secretion to PORCN-dependent Ser209 lipid modification and a WLS hand-off cycle gated by vacuolar acidification, resolving how the lipidated ligand is exported.","evidence":"Chemical-genetic screen, V-ATPase inhibition, Ser209 mutagenesis, Xenopus functional assay","pmids":["20826466"],"confidence":"High","gaps":["Identity of the proposed soluble carrier protein not established","Structural basis of WLS release left open"]},{"year":2010,"claim":"Established context-specific transcriptional control of WNT3A signaling: heparan sulfate co-stimulates osteogenic PI3K/Akt-RUNX2 output, while Sox17 directly represses β-catenin-driven Lef-1 transcription.","evidence":"Biochemical binding, RUNX2/ALP assays (heparin); EMSA, ChIP, promoter mutagenesis (Sox17)","pmids":["20547765","20802155"],"confidence":"High","gaps":["Generality of Sox17 repression beyond Lef-1 promoter unknown","How heparin sulfation patterns are sensed mechanistically unresolved"]},{"year":2016,"claim":"Demonstrated direct biochemical reconstitution that ROCK phosphorylates GSK-3β, defining a RhoA/ROCK→GSK-3β→β-catenin axis as a non-canonical route to β-catenin stabilization.","evidence":"In vitro kinase assay with purified ROCK and GSK-3β plus RhoA/ROCK inhibition","pmids":["27575935"],"confidence":"High","gaps":["How WNT3A engages RhoA upstream of ROCK not defined","Relative contribution vs canonical destruction-complex inhibition unquantified"]},{"year":2018,"claim":"Showed that secreted WNT3A self-assembles into trimeric and higher-order complexes that limit its diffusion range and are disassembled by Frizzled8 ectodomain or sFRP2, providing a biophysical basis for morphogen gradient control.","evidence":"Analytical ultracentrifugation, single-particle EM, FCS, Xenopus imaging","pmids":["30320232"],"confidence":"High","gaps":["Molecular determinants of inter-WNT3A contacts not mapped","Whether assembly modulates receptor avidity in vivo unresolved"]},{"year":2017,"claim":"Defined transcriptional targets and a Wnt/Ca2+/CaMKII/Pyk2 non-canonical route, showing WNT3A drives Runx2-dependent AChE and Wnt/Ca2+-mediated β-catenin stabilization in differentiation contexts.","evidence":"ChIP and reporter assays (AChE/Runx2); calcium imaging, Pyk2 knockdown, GSK-3β phospho-blots in neural progenitors","pmids":["28607150","28694190"],"confidence":"High","gaps":["Receptor identity coupling WNT3A to calcium flux not pinned down","Crosstalk between Ca2+ and canonical arms incompletely defined"]},{"year":2019,"claim":"Extended WNT3A regulation to physiological systems and post-translational control: Nedd4-2-mediated ubiquitination limits Wnt3a abundance, exosomal delivery selectively activates canonical signaling, and WNT3A controls neuronal autophagy via GSK-3β→AMPK.","evidence":"Ubiquitination assays and JAK3 gain/loss (Nedd4-2); exosome isolation and TCF/LEF reporters; AMPK/autophagy readouts and EM in neurons","pmids":["32433819","30901906","29642895"],"confidence":"Medium","gaps":["Whether exosomal vs free WNT3A differ mechanistically at the receptor remains open","In vivo relevance of Nedd4-2 regulation across tissues not established"]},{"year":2021,"claim":"Provided atomic-resolution insight into WNT3A export, showing the WLS GPCR-fold transmembrane domain captures the WNT3A lipid in a hydrophobic tunnel and that a palmitoleoylation-bearing β-hairpin is the key secretion interface.","evidence":"2.2 Å cryo-EM of the WLS–WNT3A complex with functional validation","pmids":["34315898"],"confidence":"High","gaps":["How the lipid is subsequently transferred to extracellular carriers not captured","Conformational steps of release not visualized"]},{"year":2024,"claim":"Linked WNT3A palmitoylation to environmental and metabolic inputs, showing bacterial adhesin–driven palmitic acid accumulation enhances Cys77 palmitoylation and that DKK1/CKAP4/PI3K-AKT signaling can rebalance WNT3A-driven β-catenin and migration.","evidence":"Acyl-biotin exchange and Co-IP/MS (FadAL-FLOT1); CKAP4 mutant analysis with AKT, LRP6 and migration readouts in MSCs","pmids":["39193618","38469899"],"confidence":"Medium","gaps":["Generality of palmitic-acid-driven palmitoylation beyond infection contexts unknown","Quantitative thresholds setting CKAP4 vs LRP6 dominance not generalized"]},{"year":null,"claim":"It remains unresolved how the array of canonical and non-canonical WNT3A branches are selected and integrated within a single cell, and what determines the choice of Frizzled/co-receptor and downstream kinase module in a given tissue.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of receptor-context-dependent branch selection","Quantitative contribution of each non-canonical arm to physiological β-catenin output is undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,11,18]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[3,25,12]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,1,31]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[11,18]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1,0]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,31]},{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[27,9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,5,7,25]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[18,16,19]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[23,15,16]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,31]}],"complexes":["WLS–WNT3A secretion complex","WNT3A homo-trimer / higher-order complex","Dvl–PI4KIIα–PIP5KI ternary complex"],"partners":["WLS","PORCN","FZD1","FZD8","LRP6","SFRP2","DVL","ILK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P56704","full_name":"Protein Wnt-3a","aliases":[],"length_aa":352,"mass_kda":39.4,"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:20093360, PubMed:21244856, PubMed:24841207, PubMed:26902720). Required for normal embryonic mesoderm development and formation of caudal somites. Required for normal morphogenesis of the developing neural tube (By similarity). Mediates self-renewal of the stem cells at the bottom on intestinal crypts (in vitro) (PubMed:26902720)","subcellular_location":"Secreted, extracellular space, extracellular matrix; Secreted","url":"https://www.uniprot.org/uniprotkb/P56704/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WNT3A","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/WNT3A","total_profiled":1310},"omim":[{"mim_id":"621260","title":"SHORT-RIB THORACIC DYSPLASIA 22 WITHOUT POLYDACTYLY; SRTD22","url":"https://www.omim.org/entry/621260"},{"mim_id":"618942","title":"IQ MOTIF- AND ANKYRIN REPEAT-CONTAINING PROTEIN 1; IQANK1","url":"https://www.omim.org/entry/618942"},{"mim_id":"618649","title":"HECT DOMAIN E3 UBIQUITIN PROTEIN LIGASE 1; HECTD1","url":"https://www.omim.org/entry/618649"},{"mim_id":"617875","title":"POLYCYSTIC LIVER DISEASE 4 WITH OR WITHOUT KIDNEY CYSTS; PCLD4","url":"https://www.omim.org/entry/617875"},{"mim_id":"617595","title":"BIRK-LANDAU-PEREZ SYNDROME; BILAPES","url":"https://www.omim.org/entry/617595"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"placenta","ntpm":14.7}],"url":"https://www.proteinatlas.org/search/WNT3A"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P56704","domains":[{"cath_id":"-","chopping":"19-135_159-188_223-291","consensus_level":"high","plddt":89.444,"start":19,"end":291},{"cath_id":"3.30.2460.20","chopping":"296-352","consensus_level":"medium","plddt":94.9696,"start":296,"end":352}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P56704","model_url":"https://alphafold.ebi.ac.uk/files/AF-P56704-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P56704-F1-predicted_aligned_error_v6.png","plddt_mean":88.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WNT3A","jax_strain_url":"https://www.jax.org/strain/search?query=WNT3A"},"sequence":{"accession":"P56704","fasta_url":"https://rest.uniprot.org/uniprotkb/P56704.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P56704/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P56704"}},"corpus_meta":[{"pmid":"15615777","id":"PMC_15615777","title":"Both 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palmitoleoylation site interacts extensively with WLS and is crucial for WLS-mediated Wnt secretion.\",\n      \"method\": \"Cryo-EM structure determination at 2.2 Å resolution with functional validation\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structure with functional validation of key binding interfaces\",\n      \"pmids\": [\"34315898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"WNT3A secretion requires PORCN-dependent lipid modification (palmitoylation) at serine 209; WLS is ER-resident in human cells and WNT3A binding to WLS requires this lipid modification; inhibition of vacuolar acidification causes accumulation of the WNT3A-WLS complex at the plasma membrane, suggesting vacuolar acidification is required to release palmitoylated WNT3A from WLS, possibly to facilitate transfer to a soluble carrier protein.\",\n      \"method\": \"Small-molecule inhibitor screen, cell biology assays, V-ATPase inhibition, site-specific mutation (Ser209), Xenopus functional assay\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (chemical genetics, mutagenesis, in vivo validation in Xenopus), replicated across cell contexts\",\n      \"pmids\": [\"20826466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Localized WNT3A signaling induces asymmetric division of mouse embryonic stem cells where proximal daughter cells maintain self-renewal and distal daughter cells acquire differentiation hallmarks; H3K27me3 (but not H3K4me3) correlates with gene expression changes during this asymmetric cell division.\",\n      \"method\": \"Localized Wnt3a delivery, single-cell joint epigenome and transcriptome sequencing (same-cell H3K27me3/H3K4me3 and RNA profiling)\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — novel single-cell multi-omic method with direct functional readout of asymmetric division, single lab but orthogonal epigenomic and transcriptomic data\",\n      \"pmids\": [\"34642323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"WNT3A activates both the Wnt/β-catenin pathway (leading to β-catenin accumulation and nuclear translocation) and the Raf-1-MEK-ERK cascade in NIH3T3 fibroblasts; WNT3A-induced ERK activation is independent of β-catenin (maintained after β-catenin siRNA), whereas ERK pathway can also be activated downstream of β-catenin/Tcf-4; both pathways contribute to G1-to-S cell cycle progression.\",\n      \"method\": \"siRNA knockdown of β-catenin and ERK, dominant-negative Tcf-4 co-transfection, Western blot, cell proliferation assays, cell cycle analysis\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal knockdown experiments with multiple signaling readouts, replicated across conditions\",\n      \"pmids\": [\"15615777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Integrin-linked kinase (ILK) activity is required for Wnt3a-induced β-catenin stabilization, nuclear translocation, and β-catenin/Lef-mediated transcription; ILK inhibition reverses Wnt3a-induced suppression of β-catenin phosphorylation; ILK can be identified in a complex with APC and GSK-3β; Wnt3a-CM (but not acute purified Wnt3a) induces GSK-3β Ser9 phosphorylation in a PI3K-dependent manner, whereas acute WNT3A stabilizes β-catenin independently of GSK-3β Ser9 phosphorylation.\",\n      \"method\": \"Pharmacological ILK inhibition, molecular inhibition, Co-immunoprecipitation (ILK/APC/GSK-3β complex), siRNA, Western blot, β-catenin/Lef reporter assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, pharmacological and molecular inhibition, multiple readouts in single lab\",\n      \"pmids\": [\"16799642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"WNT3A stimulates production of phosphatidylinositol 4-phosphate (PtdIns(4)P) via PI4K type II alpha in a Frizzled- and Dishevelled-dependent manner; Dvl directly interacts with and activates PI4KIIα by increasing its Vmax for ATP and PtdIns; Dvl, PI4KIIα, and PIP5KI form a ternary complex upon Wnt3a stimulation, enabling efficient PtdIns(4,5)P2 production.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, lipid analysis, domain mapping of Dvl\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay demonstrating direct activation plus reciprocal Co-IP, single lab\",\n      \"pmids\": [\"19561074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"WNT3A activates the PI3K-Akt pathway independently of β-catenin in NIH3T3 cells; Akt is transiently activated within 30 min and accumulates in the nucleus, while β-catenin accumulates in a prolonged manner; PI3K inhibitors (LY294002, Wortmannin) block Wnt3a-induced Akt activation and proliferation, whereas MEK inhibitor does not; Akt siRNA blocks Wnt3a-induced proliferation.\",\n      \"method\": \"siRNA knockdown (β-catenin, Akt), pharmacological inhibition, nuclear fractionation, Western blot, proliferation assays\",\n      \"journal\": \"Cellular Signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple inhibitors and siRNA confirming the pathway, single lab\",\n      \"pmids\": [\"17011750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"WNT3A induces RhoA GTPase activation, which is required for GSK-3β Ser9 phosphorylation and β-catenin accumulation; pharmacological ROCK inhibition (Y27632) or RhoA inhibition (Tat-C3, sh-RhoA) abolishes both GSK-3β phosphorylation and β-catenin accumulation; active ROCK domain directly phosphorylates purified recombinant GSK-3β in vitro, establishing a RhoA/ROCK→GSK-3β→β-catenin axis.\",\n      \"method\": \"RhoA inhibition (Tat-C3, sh-RhoA), ROCK inhibitor (Y27632), in vitro kinase assay with purified ROCK and GSK-3β, Western blot\",\n      \"journal\": \"Journal of Cellular Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase reconstitution plus genetic/pharmacological inhibition, single lab\",\n      \"pmids\": [\"27575935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Activated RhoA GTPase is required for WNT3A-stimulated transcription of a subset of β-catenin target genes in C3H10T1/2 mesenchymal stem cells during osteoblastic differentiation; RhoA inhibition does not affect β-catenin stabilization or nuclear translocation, indicating that Rho acts downstream of or parallel to β-catenin accumulation to regulate transcription of specific Wnt target genes.\",\n      \"method\": \"Expression microarrays, real-time RT-PCR, RhoA expression manipulation, osteoblast differentiation assay\",\n      \"journal\": \"Cellular Signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — microarray plus functional assays and RhoA manipulation, single lab\",\n      \"pmids\": [\"19482078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"WNT3A-heparin signaling synergistically activates the PI3K/Akt pathway and requires the RUNX2 transcription factor to stimulate alkaline phosphatase activity in osteoblasts; N-sulfation and O-sulfation of heparin contribute to physical binding of heparin to WNT3A and optimal co-stimulation of osteogenesis.\",\n      \"method\": \"Biochemical binding assays, PI3K/Akt pathway analysis, RUNX2 reporter assay, alkaline phosphatase activity assay, osteoblast differentiation\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical and functional assays in single lab\",\n      \"pmids\": [\"20547765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WNT3A-induced proliferation of osteoblastic cells is mediated primarily by a Dishevelled-dependent, β-catenin-independent pathway involving transactivation of PDGF receptors via Src family kinases; DKK1 (blocking Wnt/β-catenin via Lrp5/6) did not block Wnt3a-induced proliferation; soluble decoy PDGF-Rs and siRNA against PDGF-R confirmed its dominant role; SFK inhibitor abrogated PDGF-R phosphorylation and proliferation.\",\n      \"method\": \"siRNA (PDGF-R), decoy PDGF-R, SFK inhibitors, DKK1, Western blot, proliferation assays\",\n      \"journal\": \"Journal of Bone and Mineral Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA and pharmacological inhibition with multiple readouts, single lab\",\n      \"pmids\": [\"22927028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"WNT3A assembles into high-molecular-weight complexes (smallest form: homo-trimer) in serum-containing medium; these complexes are dissociated by interaction with the extracellular domain of Frizzled8 receptor or sFRP2; fluorescence correlation spectroscopy and immunohistochemistry in Xenopus embryos showed that assembly of WNT3A complexes restricts their diffusion and signaling range.\",\n      \"method\": \"Analytical ultracentrifugation with fluorescence detection, gel filtration chromatography, cross-linking and single-particle analysis, fluorescence correlation spectroscopy, immunohistochemistry in Xenopus embryos\",\n      \"journal\": \"Communications Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple biophysical methods (AUC, single-particle EM, FCS) plus in vivo imaging, all converging on same conclusion\",\n      \"pmids\": [\"30320232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"WNT3A signals through Frizzled-1 receptor to increase PIWIL1a expression, which in turn increases FOXM1 (a pro-survival protein), reducing neuronal apoptosis after ischemic stroke in rats; Frizzled-1 siRNA and PIWIL1a siRNA each reversed the neuroprotective effects of WNT3A; restoration of PIWIL1a after Frizzled-1 knockdown rescued FOXM1 and reduced cleaved caspase-3, placing the pathway as Frizzled-1→PIWIL1a→FOXM1.\",\n      \"method\": \"Intranasal WNT3A administration, siRNA knockdown (Frizzled-1, PIWIL1a), CRISPR-mediated PIWIL1a restoration, Western blot, immunohistochemistry, neurobehavioral tests, infarct volume measurement (MCAO rat model)\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis via siRNA and CRISPR rescue, multiple functional readouts, single lab\",\n      \"pmids\": [\"29954850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"WNT3A signals through the Wnt/Ca2+ pathway and the Wnt/β-catenin pathway in hippocampal neurons; intrahippocampal WNT3A antibody impaired contextual fear memory acquisition and consolidation; the Wnt/Ca2+ pathway (blocked by sFRP1) is involved in acquisition, while Wnt/β-catenin (blocked by Dkk1) is involved in consolidation; constitutively active β-catenin rescued the consolidation deficit caused by WNT3A antibody injection.\",\n      \"method\": \"Intrahippocampal infusion of WNT3A antibody, Dkk1, sFRP1, constitutively active β-catenin; contextual fear conditioning behavioral assay; genetic rescue\",\n      \"journal\": \"Cerebral Cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic intervention with specific behavioral readouts, epistasis via β-catenin rescue, single lab\",\n      \"pmids\": [\"24904070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WNT3A overexpression in mesenchymal stem cells (MSCs) activates both canonical (β-catenin) and non-canonical (CaMKII) Wnt pathways; canonical pathway promotes MSC proliferation, while non-canonical CaMKII pathway inhibits chondrogenesis; blocking canonical pathway (DKK1) enhanced inhibition of chondrogenesis synergistically, and blocking non-canonical pathway (KN93) enhanced proliferation, demonstrating these two pathways counteract each other.\",\n      \"method\": \"WNT3A overexpression, DKK1 treatment, CaMKII inhibitor (KN93), chondrogenesis assay, proliferation assay\",\n      \"journal\": \"Frontiers in Bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection of two signaling arms with functional cellular readouts, single lab\",\n      \"pmids\": [\"23276938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"WNT3A induces expression of AChE in osteoblasts via the Wnt/β-catenin signaling pathway; Runx2 (a downstream transcription factor of Wnt/β-catenin) binds to the ACHE gene promoter as shown by ChIP; deletion of the Runx2-binding site in the ACHE promoter reduced activity during osteoblastic differentiation; DKK1 blocked Wnt3a-induced AChE expression.\",\n      \"method\": \"Recombinant WNT3A treatment, Runx2 overexpression, ChIP, luciferase reporter assay with deletion mutants, DKK1 inhibition, Western blot\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP plus luciferase reporter with promoter deletion mutants, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"28607150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"WNT3A directly activates MyoD expression by targeting cis-regulatory elements including the distal enhancer (DE) and a Wnt-response element (L fragment at -8 to -9k region); activation occurs through both canonical and non-canonical pathways; Pax3/Pax7 binding sites in the L fragment are partially required for Wnt3a response; ChIP confirmed β-catenin binding to DE and Pax7 binding to L fragment.\",\n      \"method\": \"Luciferase reporter assays with promoter deletion constructs, ChIP for β-catenin and Pax7, Wnt3a-conditioned medium treatment\",\n      \"journal\": \"Bioscience Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and deletion reporter assays in single lab\",\n      \"pmids\": [\"25651906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WNT3A stimulation promotes primary ciliogenesis through a pathway in which CK1δ phosphorylates β-catenin at S47, leading to reorganization of centriolar satellites and ciliogenesis; this pathway was confirmed in MCF-7/ADR multidrug-resistant cells.\",\n      \"method\": \"Cell biology assays, phospho-specific antibodies, centriolar satellite imaging, WNT3A treatment, MCF-7/ADR validation\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway with specific phosphorylation event and subcellular imaging, single lab\",\n      \"pmids\": [\"32023461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Wnt3a is required for left-right (LR) asymmetry in mice; Wnt3a activates the Delta/Notch pathway to regulate perinodal expression of the left determinant Nodal; simultaneously, Wnt3a controls the segmentation clock and molecular oscillations of both the Wnt/β-catenin and Notch pathways; Wnt3a acts as a long-range signaling molecule from the primitive streak/dorsal posterior node to regulate target gene expression throughout the node and presomitic mesoderm.\",\n      \"method\": \"Wnt3a genetic mutant analysis, gene expression analysis, epistasis via Wnt3a/Notch/Nodal pathway, in vivo mouse embryology\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function in mice with clear molecular pathway placement, multiple pathway components validated\",\n      \"pmids\": [\"16291790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In Xenopus laevis, Wnt3a activates Meis3 transcription factor; upon strong Wnt3a/Meis3 feedback loop activity, Tsh1 is induced and forms a Meis3-Tsh1 transcription repressor complex that represses the Meis3 promoter, allowing cell cycle exit and neuron differentiation in hindbrain development; functional and biochemical analyses confirmed Tsh1 induction by Wnt3a/Meis3 and the repressive complex.\",\n      \"method\": \"Functional assays in Xenopus embryos, biochemical (co-immunoprecipitation of Meis3-Tsh1 complex), promoter assays, loss-of-function\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical complex plus functional epistasis in Xenopus, single lab\",\n      \"pmids\": [\"22399680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"WNT3A exosomal delivery inhibits GSK3β activity, induces nuclear translocation of β-catenin, and activates TCF/LEF transcriptional program in cardiac fibroblasts; WNT3A-rich exosomes did not activate ERK, JNK, or AP-1 pathways.\",\n      \"method\": \"Exosome isolation by ultracentrifugation, Western blot for GSK3β phosphorylation, nuclear fractionation, TCF/LEF reporter assay\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pathway readouts with exosomal delivery system, negative results for non-canonical pathways, single lab\",\n      \"pmids\": [\"30901906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WNT3A-loaded exosomes (but not recombinant WNT3A alone) activated canonical WNT signaling in cartilage in vivo, as demonstrated by TCF/Lef:H2B-GFP reporter mice, and improved repair of osteochondral defects; in vitro, WNT3A on exosomes activated WNT signaling via SUPER8TOPFlash reporter.\",\n      \"method\": \"Exosome loading, TCF/Lef:H2B-GFP reporter mice (in vivo pathway activation), SUPER8TOPFlash reporter (in vitro), osteochondral defect histological scoring\",\n      \"journal\": \"Journal of Extracellular Vesicles\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic reporter in vivo plus in vitro validation, single lab\",\n      \"pmids\": [\"34025953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"JAK3 phospho-inactivates Nedd4-2 (an ubiquitin E3 ligase) in innate immune cells infected with P. gingivalis; reduced Nedd4-2 activity decreases Wnt3a ubiquitination, increasing Wnt3a protein levels; downstream, Dvl3 and β-catenin mediate the anti-inflammatory role of Wnt3a.\",\n      \"method\": \"JAK3 gain/loss-of-function, Nedd4-2 ubiquitination assay, Western blot, in vivo periodontal disease model\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay and genetic gain/loss-of-function, single lab\",\n      \"pmids\": [\"32433819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sox17 suppresses WNT3A/β-catenin-dependent transcriptional activation of the Lef-1 promoter; Sox17 binds to four sites in the Lef-1 promoter (directly or indirectly through TCF complexes) as shown by EMSA and ChIP; the DNA- and β-catenin-binding domains of Sox17 control context-specific binding; combinatorial mutagenesis of Sox17- and TCF-binding sites controls Wnt/β-catenin-mediated induction and repression.\",\n      \"method\": \"Reporter assays, EMSA, ChIP, site-directed mutagenesis of promoter binding sites\",\n      \"journal\": \"American Journal of Physiology - Lung Cellular and Molecular Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — EMSA, ChIP, and mutagenesis in single study with multiple orthogonal methods\",\n      \"pmids\": [\"20802155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Mechanical strain induces Src-dependent phosphorylation of β-catenin at Y654 and increases β-catenin-mediated transcription; WNT3A addition (or Casein Kinase I inhibition) increases β-catenin transcription and causes cell accumulation in S/G2, but only the combination of mechanical strain plus WNT3A/β-catenin activation triggers mitosis, indicating synergism between Src-mediated Y654 phosphorylation and Wnt-dependent β-catenin stabilization.\",\n      \"method\": \"Mechanical strain device, WNT3A addition, CKI inhibition, phospho-specific Y654 antibody, live-cell imaging, cell cycle analysis in MDCK cells\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic dissection with specific phosphorylation mutants and defined phenotypic readout, single lab\",\n      \"pmids\": [\"27782880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"WNT3A signals through Frizzled receptors to activate the Wnt/Ca2+ pathway (increasing cytosolic free calcium and CaMKII activity) in differentiating human neural progenitor cells; Wnt3a-mediated Ca2+ increase activates Pyk2 kinase, which phosphorylates GSK-3β and stabilizes β-catenin, representing a non-canonical route to β-catenin stabilization via the Wnt/Ca2+/CaMKII/Pyk2/GSK-3β axis.\",\n      \"method\": \"Calcium imaging, CaMKII activation assay, Pyk2 knockdown/inhibition, Western blot for GSK-3β phosphorylation and β-catenin, human neural progenitor cell differentiation model\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical readouts and kinase pathway dissection, single lab\",\n      \"pmids\": [\"28694190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Wnt3a ligand promotes autophagy in hippocampal neurons by inactivating GSK-3β, which in turn activates AMPK (a major GSK-3β target regulating cellular metabolism); this mechanism is independent of β-catenin, defining a non-canonical Wnt3a→Frizzled→GSK-3β inhibition→AMPK activation→autophagy pathway.\",\n      \"method\": \"Primary hippocampal neuron culture, hippocampal slice CA1 region, GSK-3β inhibition, AMPK activation assay, Western blot, CYTO-ID fluorescent probe, transmission electron microscopy\",\n      \"journal\": \"Cell Communication and Signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal readouts (biochemical, EM, fluorescent probe) in neuronal model, single lab\",\n      \"pmids\": [\"29642895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Basic calcium phosphate (BCP) crystals physically bind to WNT3A in vitro and co-localize with WNT3A and heparan sulfate proteoglycans in the pericellular matrix of OA chondrocytes; BCP crystal-bound WNT3A is sufficient to induce canonical Wnt signaling (LRP6 phosphorylation, β-catenin stabilization) and hypertrophic shift in chondrocyte phenotype, identifying BCP crystals as a concentrating factor for WNT3A.\",\n      \"method\": \"Immunohistochemistry (WNT3A/BCP co-localization), in vitro BCP-WNT3A binding (western blot), LRP6 phosphorylation assay, β-catenin western blot, qRT-PCR for chondrocyte marker genes\",\n      \"journal\": \"Annals of the Rheumatic Diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay plus functional downstream signaling readouts, single lab\",\n      \"pmids\": [\"32371389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Wnt5a inhibits Wnt3a-induced alkaline phosphatase (ALP) expression in dental follicle cells without affecting β-catenin nuclear translocation or Tcf-mediated transcription, indicating that Wnt5a inhibits a point downstream of the β-catenin-Tcf complex; Wnt5a gene silencing enhanced Wnt3a-mediated ALP expression, confirming a cross-inhibitory mechanism between canonical and non-canonical Wnt pathways in dental follicle cells.\",\n      \"method\": \"Wnt5a siRNA knockdown, recombinant Wnt5a treatment, ALP expression assay, β-catenin nuclear translocation assay, Tcf transcriptional reporter assay\",\n      \"journal\": \"Experimental Cell Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA and functional epistasis dissecting two pathways, single lab\",\n      \"pmids\": [\"26112214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"WNT3A activates β1-integrin and regulates migration and adhesion of vascular smooth muscle cells; WNT3A treatment triggers phosphorylation of β-catenin at Ser675 and GSK-3β at Ser9, increases ILK protein expression, and activates β1-integrin without changing total cell surface expression.\",\n      \"method\": \"Wnt3a recombinant protein treatment, Western blot for phospho-β-catenin and phospho-GSK-3β, ILK expression analysis, β1-integrin activation assay, migration and adhesion assays\",\n      \"journal\": \"Molecular Medicine Reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single set of Western blot and functional assays without genetic knockdown confirmation of ILK/β1-integrin pathway\",\n      \"pmids\": [\"24535659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DKK1 activates the PI3K/AKT pathway via its receptor CKAP4 (cytoskeleton-associated protein 4) in MSCs, which can balance DKK1's inhibitory effect on Wnt/β-catenin signaling and regulate Wnt3a-induced MSC migration; at lower DKK1 concentrations the CKAP4/PI3K/AKT arm promotes active β-catenin accumulation and migration, while at higher concentrations inhibition of LRP6 phosphorylation dominates.\",\n      \"method\": \"CKAP4 overexpression including CRD2-deletion mutant and intracellular domain mutant (P/A), AKT phosphorylation assay, active β-catenin accumulation, LRP6 phosphorylation, MSC migration assays\",\n      \"journal\": \"Stem Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple CKAP4 mutants with defined functional consequences, single lab\",\n      \"pmids\": [\"38469899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FadAL adhesin of Fusobacterium periodonticum interacts with FLOT1, activating PI3K-AKT/FASN signaling to increase palmitic acid accumulation; this palmitic acid enhances WNT3A palmitoylation at conserved Cys-77, promoting WNT3A membrane localization and nuclear translocation of β-catenin; demonstrated by acyl-biotin exchange and co-immunoprecipitation coupled to mass spectrometry.\",\n      \"method\": \"Acyl-biotin exchange assay (palmitoylation), Co-IP coupled to mass spectrometry (FadAL-FLOT1 interaction), PI3K-AKT-FASN pathway analysis, β-catenin nuclear translocation\",\n      \"journal\": \"Gut Microbes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct palmitoylation assay with specific cysteine site identification plus proteomics, single lab\",\n      \"pmids\": [\"39193618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PITX2 transcription factor directly activates WNT3A transcription in lung adenocarcinoma; PITX2 knockdown reduced WNT3A expression and Wnt/β-catenin pathway activity; the oncogenic role of PITX2 was dependent on WNT3A-mediated canonical Wnt signaling.\",\n      \"method\": \"siRNA knockdown of PITX2, qRT-PCR and Western blot for WNT3A, Wnt/β-catenin pathway reporter assay, xenograft mouse model\",\n      \"journal\": \"Cancer Cell International\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — indirect transcriptional regulation inferred from expression after knockdown, no direct ChIP for PITX2 on WNT3A promoter reported in abstract\",\n      \"pmids\": [\"31043858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LINC00665 lncRNA binds to the transcription factor YBX1 (RNA pulldown, RIP, RIP-seq); YBX1 regulates WNT3A transcriptional activity as shown by luciferase reporter and ChIP; LINC00665/YBX1 forms a positive feed-forward loop that activates Wnt3a/β-catenin signaling to promote gastric cancer EMT and progression.\",\n      \"method\": \"RNA pulldown, RIP, RIP-seq, luciferase reporter assay, ChIP for YBX1 on WNT3A promoter\",\n      \"journal\": \"Cancer Gene Therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RIP, ChIP, luciferase) confirming YBX1-WNT3A regulation, single lab\",\n      \"pmids\": [\"37563362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In vivo administration of recombinant mouse Wnt3a (rmWnt3a) to LRP6(R611C) mutant mice normalized altered expression of enzymes of de novo lipogenesis and cholesterol biosynthesis, and restored plasma TG and LDL levels; in vitro, rmWnt3a treatment of primary LRP6(R611C) hepatocytes normalized IGF1, AKT, mTORC1, and mTORC2 pathway hyperactivation, placing WNT3A upstream of LRP6-mediated hepatic lipid regulation.\",\n      \"method\": \"In vivo rmWnt3a injection in LRP6(R611C) mice, primary hepatocyte culture treatment, pathway analysis (IGF1/AKT/mTOR), lipid and cholesterol enzyme expression assays\",\n      \"journal\": \"Cell Metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo rescue plus in vitro mechanistic dissection, single lab\",\n      \"pmids\": [\"24506864\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WNT3A is a palmitoylated secreted ligand (modified by PORCN at Ser209/Cys77) that binds to WLS through its lipid moiety (traversing a hydrophobic tunnel in the WLS GPCR-like transmembrane domain) for secretion; once secreted, WNT3A assembles into homo-trimeric and higher-order complexes that restrict its diffusion range, and signals canonically through Frizzled receptors and LRP5/6 co-receptors to inhibit the β-catenin destruction complex, leading to β-catenin stabilization and nuclear TCF/LEF-dependent transcription, while also activating non-canonical branches including RhoA/ROCK (which directly phosphorylates GSK-3β), PI3K/Akt, ERK/MAPK, Wnt/Ca2+/CaMKII/Pyk2, and PI4KIIα-dependent phosphoinositide production, with pathway output depending on cellular context, co-receptors (Lrp5 vs Lrp6), and interacting proteins such as ILK, sFRPs, heparan sulfate, and BCP crystals.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"WNT3A is a secreted, lipid-modified morphogen that orchestrates cell fate, proliferation, and tissue patterning by activating canonical β-catenin signaling and an array of non-canonical branches in a context-dependent manner [#18, #3]. Its production and export depend on PORCN-mediated lipid modification: palmitoylation at Ser209, and palmitoylation at the conserved Cys77 driven by available palmitic acid, are required for membrane localization and for binding to the ER-resident carrier WLS [#1, #31]. A high-resolution structure of the WLS–WNT3A complex shows that the WNT3A lipid moiety traverses a hydrophobic tunnel in the GPCR-fold transmembrane domain of WLS while a palmitoleoylation-bearing β-hairpin docks onto WLS, an interface essential for secretion; vacuolar acidification then releases the complex to a soluble carrier [#0, #1]. Once secreted, WNT3A self-assembles into homo-trimeric and higher-order complexes that restrict its diffusion and signaling range, complexes that are dissociated upon binding the Frizzled8 ectodomain or sFRP2 [#11]. Canonically, WNT3A signals through Frizzled and LRP5/6 to inhibit the β-catenin destruction complex, stabilizing β-catenin and driving TCF/LEF-dependent transcription of targets including Lef-1, MyoD, AChE (via Runx2), and Nodal pathway components, thereby controlling left-right asymmetry, the segmentation clock, osteoblastic and myogenic differentiation [#18, #23, #16, #15]. In parallel, WNT3A activates multiple β-catenin-independent routes — Raf-1/MEK/ERK, PI3K/Akt, and a Dishevelled-directed PI4KIIα/PIP5KI lipid kinase module producing PtdIns(4)P and PtdIns(4,5)P2 — that together drive G1-to-S progression and proliferation [#3, #6, #5]. Convergent non-canonical inputs feed back onto GSK-3β: RhoA/ROCK directly phosphorylates GSK-3β, and a Wnt/Ca2+/CaMKII/Pyk2 axis stabilizes β-catenin through GSK-3β inhibition, while GSK-3β inactivation can also activate AMPK to promote autophagy [#7, #25, #26]. Pathway output is further tuned by interacting proteins and matrix components — ILK, heparan sulfate, basic calcium phosphate crystals that concentrate WNT3A, and antagonistic Wnt5a — and by the receptor/co-receptor context such as LRP6 in hepatic lipid metabolism [#4, #9, #27, #28, #34].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established WNT3A as a long-range developmental morphogen, placing it upstream of Notch/Nodal in left-right axis specification and of the segmentation clock, defining its role in body-plan patterning.\",\n      \"evidence\": \"Wnt3a genetic mutant analysis with pathway epistasis in mouse embryos\",\n      \"pmids\": [\"16291790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve the receptor/co-receptor configuration mediating long-range signaling\", \"Mechanism of graded diffusion not addressed at biophysical level\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed that WNT3A signaling bifurcates into β-catenin-dependent and β-catenin-independent (Raf-1/MEK/ERK) arms that both feed cell cycle progression, establishing that WNT3A is not a purely canonical ligand.\",\n      \"evidence\": \"Reciprocal siRNA knockdown of β-catenin and ERK, dominant-negative Tcf-4, cell cycle analysis in NIH3T3\",\n      \"pmids\": [\"15615777\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor route distinguishing ERK from β-catenin activation not defined\", \"Single cell type\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified ILK and PI3K/Akt as required modulators of WNT3A-induced β-catenin stabilization and proliferation, distinguishing acute purified ligand (GSK-3β Ser9-independent) from conditioned medium (PI3K-dependent Ser9 phosphorylation).\",\n      \"evidence\": \"ILK and PI3K pharmacological/genetic inhibition, ILK/APC/GSK-3β Co-IP, β-catenin/Lef reporter in fibroblasts\",\n      \"pmids\": [\"16799642\", \"17011750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical link between ILK and the destruction complex not fully defined\", \"How acute vs chronic stimulation diverge mechanistically remains unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined a Dishevelled-directed lipid-kinase module in which Dvl directly activates PI4KIIα and assembles a PI4KIIα/PIP5KI complex, connecting WNT3A receptor engagement to phosphoinositide production.\",\n      \"evidence\": \"In vitro kinase assays, reciprocal Co-IP, Dvl domain mapping, lipid analysis\",\n      \"pmids\": [\"19561074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream functional consequence of the phosphoinositides in vivo not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed RhoA downstream of or parallel to β-catenin accumulation, controlling a transcriptional subset of Wnt targets during osteoblastic differentiation independently of β-catenin stabilization.\",\n      \"evidence\": \"Microarray, RT-PCR, RhoA manipulation in C3H10T1/2 cells\",\n      \"pmids\": [\"19482078\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the transcriptional effector linking RhoA to specific genes not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mechanistically linked WNT3A secretion to PORCN-dependent Ser209 lipid modification and a WLS hand-off cycle gated by vacuolar acidification, resolving how the lipidated ligand is exported.\",\n      \"evidence\": \"Chemical-genetic screen, V-ATPase inhibition, Ser209 mutagenesis, Xenopus functional assay\",\n      \"pmids\": [\"20826466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the proposed soluble carrier protein not established\", \"Structural basis of WLS release left open\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established context-specific transcriptional control of WNT3A signaling: heparan sulfate co-stimulates osteogenic PI3K/Akt-RUNX2 output, while Sox17 directly represses β-catenin-driven Lef-1 transcription.\",\n      \"evidence\": \"Biochemical binding, RUNX2/ALP assays (heparin); EMSA, ChIP, promoter mutagenesis (Sox17)\",\n      \"pmids\": [\"20547765\", \"20802155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of Sox17 repression beyond Lef-1 promoter unknown\", \"How heparin sulfation patterns are sensed mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated direct biochemical reconstitution that ROCK phosphorylates GSK-3β, defining a RhoA/ROCK→GSK-3β→β-catenin axis as a non-canonical route to β-catenin stabilization.\",\n      \"evidence\": \"In vitro kinase assay with purified ROCK and GSK-3β plus RhoA/ROCK inhibition\",\n      \"pmids\": [\"27575935\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How WNT3A engages RhoA upstream of ROCK not defined\", \"Relative contribution vs canonical destruction-complex inhibition unquantified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed that secreted WNT3A self-assembles into trimeric and higher-order complexes that limit its diffusion range and are disassembled by Frizzled8 ectodomain or sFRP2, providing a biophysical basis for morphogen gradient control.\",\n      \"evidence\": \"Analytical ultracentrifugation, single-particle EM, FCS, Xenopus imaging\",\n      \"pmids\": [\"30320232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular determinants of inter-WNT3A contacts not mapped\", \"Whether assembly modulates receptor avidity in vivo unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined transcriptional targets and a Wnt/Ca2+/CaMKII/Pyk2 non-canonical route, showing WNT3A drives Runx2-dependent AChE and Wnt/Ca2+-mediated β-catenin stabilization in differentiation contexts.\",\n      \"evidence\": \"ChIP and reporter assays (AChE/Runx2); calcium imaging, Pyk2 knockdown, GSK-3β phospho-blots in neural progenitors\",\n      \"pmids\": [\"28607150\", \"28694190\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor identity coupling WNT3A to calcium flux not pinned down\", \"Crosstalk between Ca2+ and canonical arms incompletely defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended WNT3A regulation to physiological systems and post-translational control: Nedd4-2-mediated ubiquitination limits Wnt3a abundance, exosomal delivery selectively activates canonical signaling, and WNT3A controls neuronal autophagy via GSK-3β→AMPK.\",\n      \"evidence\": \"Ubiquitination assays and JAK3 gain/loss (Nedd4-2); exosome isolation and TCF/LEF reporters; AMPK/autophagy readouts and EM in neurons\",\n      \"pmids\": [\"32433819\", \"30901906\", \"29642895\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether exosomal vs free WNT3A differ mechanistically at the receptor remains open\", \"In vivo relevance of Nedd4-2 regulation across tissues not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided atomic-resolution insight into WNT3A export, showing the WLS GPCR-fold transmembrane domain captures the WNT3A lipid in a hydrophobic tunnel and that a palmitoleoylation-bearing β-hairpin is the key secretion interface.\",\n      \"evidence\": \"2.2 Å cryo-EM of the WLS–WNT3A complex with functional validation\",\n      \"pmids\": [\"34315898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the lipid is subsequently transferred to extracellular carriers not captured\", \"Conformational steps of release not visualized\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked WNT3A palmitoylation to environmental and metabolic inputs, showing bacterial adhesin–driven palmitic acid accumulation enhances Cys77 palmitoylation and that DKK1/CKAP4/PI3K-AKT signaling can rebalance WNT3A-driven β-catenin and migration.\",\n      \"evidence\": \"Acyl-biotin exchange and Co-IP/MS (FadAL-FLOT1); CKAP4 mutant analysis with AKT, LRP6 and migration readouts in MSCs\",\n      \"pmids\": [\"39193618\", \"38469899\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality of palmitic-acid-driven palmitoylation beyond infection contexts unknown\", \"Quantitative thresholds setting CKAP4 vs LRP6 dominance not generalized\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the array of canonical and non-canonical WNT3A branches are selected and integrated within a single cell, and what determines the choice of Frizzled/co-receptor and downstream kinase module in a given tissue.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of receptor-context-dependent branch selection\", \"Quantitative contribution of each non-canonical arm to physiological β-catenin output is undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 11, 18]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [3, 25, 12]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 1, 31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [11, 18]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 0]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 31]},\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [27, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 5, 7, 25]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [18, 16, 19]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [23, 15, 16]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 31]}\n    ],\n    \"complexes\": [\"WLS\\u2013WNT3A secretion complex\", \"WNT3A homo-trimer / higher-order complex\", \"Dvl\\u2013PI4KII\\u03b1\\u2013PIP5KI ternary complex\"],\n    \"partners\": [\"WLS\", \"PORCN\", \"FZD1\", \"FZD8\", \"LRP6\", \"sFRP2\", \"DVL\", \"ILK\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}