{"gene":"WNT1","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1999,"finding":"FrzA (a secreted frizzled-related protein, sFRP) specifically binds to WNT1 protein but not WNT5a, and this binding inhibits WNT1-mediated stabilization of cytoplasmic β-catenin and WNT1-induced transcription from a Lef/TCF reporter gene, acting as a negative regulator of WNT1 signaling.","method":"Co-immunoprecipitation, co-culture binding assays, β-catenin immunoblotting, TCF/Lef luciferase reporter assay","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays, multiple orthogonal functional readouts (β-catenin levels, reporter transcription), single lab","pmids":["10523516"],"is_preprint":false},{"year":2000,"finding":"WNT1 signaling in cardiac myocytes induces Cx43 (connexin43) mRNA and protein expression transcriptionally via β-catenin accumulation; the accumulated Cx43 co-localizes with β-catenin at junctional membranes and reduces β-catenin transactivation potential, creating a feedback mechanism.","method":"Co-culture with Wnt1-secreting cells, Li+ treatment mimicking Wnt signaling, Cx43 promoter-reporter transfection, Lucifer Yellow dye transfer, calcium wave propagation assay, immunolocalization","journal":"The Journal of Clinical Investigation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, dye transfer, co-localization, co-culture), single lab","pmids":["10642594"],"is_preprint":false},{"year":2000,"finding":"WNT1 inhibits GSK-3β activity, leading to decreased cyclin D1 proteolysis and hyperaccumulation of active cyclin D1–CDK4 complexes; co-expression of WNT1 with activated MEK1 drives cyclin D1 accumulation and S-phase entry in the absence of serum growth factors, and a dominant-negative cyclin D1 mutant blocks this effect.","method":"Overexpression in NIH-3T3 cells, GSK-3β kinase assay, cyclin D1 immunoblotting, S-phase BrdU incorporation, dominant-negative cyclin D1 rescue","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — kinase assay, rescue experiment with dominant-negative, multiple readouts, single lab","pmids":["10748202"],"is_preprint":false},{"year":2003,"finding":"Constitutive WNT1 expression in HC11 mammary epithelial cells activates TCF transcriptional activity and transactivates ErbB1 via MMP-mediated release of soluble ErbB1 ligands (blocked by anti-ErbB1 antibody and MMP inhibitors), leading to MAPK activation and increased cyclin D1 levels.","method":"Conditioned media transfer, ErbB1 phosphorylation assays, MMP inhibitor treatment, ErbB1-blocking antibody, MAPK assay, cyclin D1 immunoblot","journal":"EMBO Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and antibody inhibition, conditioned media experiments; single lab, multiple orthogonal approaches","pmids":["12612606"],"is_preprint":false},{"year":2004,"finding":"WNT1 signal causes nuclear entry of TAK1, which activates HIPK2 and NLK; NLK binds directly to c-Myb together with HIPK2, resulting in phosphorylation of c-Myb at multiple sites followed by ubiquitination and proteasome-dependent degradation, thereby suppressing c-Myb transcriptional activity.","method":"Co-immunoprecipitation, kinase assays, ubiquitination assay, proteasome inhibitor rescue, NLK overexpression in M1 cells","journal":"Genes & Development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay, direct protein-protein interaction by Co-IP, ubiquitination assay, functional rescue with proteasome inhibitor; single lab but multiple orthogonal methods","pmids":["15082531"],"is_preprint":false},{"year":2004,"finding":"WNT1 cooperates with insulin/IGF signaling via GSK-3 inhibition to activate canonical Wnt/β-catenin signaling (nuclear β-catenin accumulation) in C2 myoblasts, promoting MyoD and myogenin expression, reserve cell activation, and myotube hypertrophy through increased reserve cell fusion.","method":"Co-culture with Wnt1-expressing fibroblasts, LiCl/SB216763 GSK-3 inhibition, nuclear β-catenin immunostaining, MyoD/myogenin immunofluorescence, myotube size quantification","journal":"Molecular Biology of the Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell co-culture, pharmacological mimicry, immunostaining with multiple readouts; single lab","pmids":["15282335"],"is_preprint":false},{"year":2004,"finding":"Ectopic WNT1 expression in the caudal midbrain induces overproliferation of precursor cells in a gene dosage-dependent manner by shortening cell cycle length, and in adults promotes cell size increase specifically in neurons, demonstrating WNT1 acts as a regulator of proliferation of specific precursor populations in the mid-/hindbrain.","method":"Transgenic mice expressing Wnt1 under En1 promoter, BrdU/cell cycle length analysis, cell size morphometry, FACS","journal":"Molecular and Cellular Neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vivo transgenic overexpression with cell cycle readout; single lab, single model system","pmids":["15121182"],"is_preprint":false},{"year":2005,"finding":"In zebrafish hindbrain, Wnt1 (expressed at boundary and roof plate cells) activates proneural and delta gene expression to promote neurogenesis in non-boundary regions, and this neurogenesis/Notch-mediated lateral inhibition prevents ectopic boundary cell formation; Rfng modulates Notch signaling and is required for wnt1 expression at hindbrain boundaries.","method":"Morpholino knockdown of wnt1 and tcf3b, rfng knockdown, in situ hybridization for boundary markers (rfng, foxb1.2), epistasis analysis","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — morpholino loss-of-function with multiple marker readouts and epistasis; single lab","pmids":["15659486"],"is_preprint":false},{"year":2000,"finding":"The transcription factor Lmx1b maintains Wnt1 expression in the isthmic organizer: FGF8 induces Lmx1b expression, and Lmx1b in turn sustains Wnt1 expression; retroviral Lmx1b expression maintains Wnt1 in the mesencephalon, but ectopic Wnt1 does not recapitulate Lmx1b effects on mesencephalic morphology.","method":"In situ hybridization, FGF8-soaked bead implantation, RCAS retroviral misexpression of Lmx1b and Wnt1 in chick embryos","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function retroviral misexpression with in situ validation; single lab","pmids":["10751174"],"is_preprint":false},{"year":2002,"finding":"Misexpression of Lmx1b or Wnt1 in chick embryos causes expansion of tectum and cerebellum; Lmx1b induces Wnt1 expression, and Wnt1 in turn induces Fgf8 expression non-cell-autonomously, placing Wnt1 downstream of Lmx1b and upstream of Fgf8 in the isthmic organizer gene cascade.","method":"RCAS retroviral misexpression in chick, in situ hybridization for Fgf8, Wnt1, Lmx1b expression","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain-of-function with epistasis analysis; single lab","pmids":["12399317"],"is_preprint":false},{"year":2006,"finding":"Lmx1b is essential for Fgf8 and Wnt1 expression at the midbrain-hindbrain boundary: Lmx1b-/- embryos show complete absence of Fgf8 and downregulation of Wnt1 before the 4-somite stage; conditional region-specific knockout confirmed Lmx1b acts upstream of both Wnt1 and Fgf8 in the isthmic organizer cross-regulatory network.","method":"Lmx1b knockout mice, Wnt1-Cre conditional knockout, in situ hybridization, quantitative gene expression analysis","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — conventional and conditional knockout with multiple gene expression readouts; replicated across genetic approaches in single study","pmids":["17166916"],"is_preprint":false},{"year":2013,"finding":"WNT1 missense mutations (p.Cys218Gly and p.Val355Phe identified in families with early-onset osteoporosis and osteogenesis imperfecta) show impaired capacity to induce canonical WNT/β-catenin signaling and target gene expression and mineralization in vitro; lineage tracing identified Wnt1 expression in osteocytes in mice.","method":"TOPflash luciferase reporter assay in cells transfected with mutant WNT1, mineralization assay, lineage tracing in mice","journal":"The New England Journal of Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function mutations with in vitro reporter assay and mineralization readout; replicated across two independent families and confirmed in separate study (PMID:23499309)","pmids":["23656646","23499309"],"is_preprint":false},{"year":2013,"finding":"Hypofunctional WNT1 alleles (frameshift, missense, splice-site, nonsense) cause failure to activate canonical LRP5-mediated WNT/β-catenin signaling; in vitro osteoblast differentiation shows enhanced Wnt1 expression with advancing differentiation, indicating a role in osteoblast function.","method":"Functional analysis of WNT1 variants in cell-based reporter assays; osteoblast differentiation assays","journal":"American Journal of Human Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with multiple alleles, single lab, complementary human genetics","pmids":["23499309"],"is_preprint":false},{"year":2018,"finding":"Inactivation of Wnt1 specifically in osteoblasts causes severe osteoporosis and spontaneous fractures in mice, while conditional Wnt1 expression in osteoblasts increases osteoblast numbers and function; critically, the bone-anabolic effect of Wnt1 does not require LRP5, demonstrating Wnt1 can signal independently of this canonical co-receptor.","method":"Osteoblast-specific conditional knockout and conditional overexpression mouse models, micro-CT, histomorphometry, LRP5 knockout epistasis experiment","journal":"Science Translational Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional KO and OE with specific phenotype, LRP5 epistasis establishing co-receptor independence; multiple genetic models in one study","pmids":["30404864"],"is_preprint":false},{"year":2019,"finding":"Mesenchymal cell-derived WNT1 signals strictly in a juxtacrine (short-range) manner to induce osteoblast differentiation and suppress osteoclastogenesis, in part via canonical Wnt signaling; deletion of Wnt1 in limb mesenchymal progenitors leads to spontaneous fractures due to impaired osteoblast function and increased bone resorption.","method":"Global and limb-bud mesenchymal conditional Wnt1 knockout mice, co-culture juxtacrine vs. paracrine assays, histomorphometry, osteoclast differentiation assays","journal":"Journal of Bone and Mineral Research","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined cellular phenotype, juxtacrine signaling mode established by co-culture design; multiple orthogonal methods","pmids":["30690791"],"is_preprint":false},{"year":2015,"finding":"Osteoclast TGF-β receptor signaling induces Wnt1 expression in osteoclasts; osteoclast-specific inhibition of TGF-β receptor signaling reduces Wnt1 expression and osteoblast numbers, coupling bone resorption to formation via osteoclast-derived Wnt1.","method":"Osteoclast-specific TGF-β receptor knockout mice, Wnt1 expression analysis in osteoclasts, osteoblast number histomorphometry, TGF-β stimulation assays","journal":"Journal of Bone and Mineral Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockout with defined cellular and tissue-level phenotype; single lab","pmids":["26108893"],"is_preprint":false},{"year":2015,"finding":"Proximal tubule-specific inducible secretion of Wnt1 in mice is sufficient to drive interstitial myofibroblast activation, proliferation, and matrix protein production in kidneys without inflammatory cytokine expression or leukocyte infiltration, demonstrating that epithelial-derived Wnt1 drives renal fibrosis via paracrine canonical Wnt signaling.","method":"Inducible proximal-tubule Wnt1-expressing transgenic mouse, histology, myofibroblast marker staining, cytokine profiling, Wnt target gene expression in isolated PDGFR-β+ myofibroblasts","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — novel transgenic model with clean paracrine secretion, multiple tissue readouts; single lab but rigorous design","pmids":["26204899"],"is_preprint":false},{"year":2013,"finding":"WNT1 in zebrafish acts redundantly with Wnt10b at the midbrain-hindbrain boundary (MHB): combined deletion/knockdown of wnt1 and wnt10b abolishes pax2.1, en2, and her5 expression in the ventral MHB; wnt1/wnt10b maintain threshold levels of Pax2.1 and Fgf8, and embryos deficient in both loci are sensitized to Pax2.1 or Fgf8 reduction.","method":"Deficiency allele generation, morpholino antisense knockdown, double-mutant epistasis with pax2.1 and fgf8 alleles, in situ hybridization","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic deletion plus morpholino with epistasis; single lab","pmids":["12591239"],"is_preprint":false},{"year":2013,"finding":"Conditional deletion of Wnt1 at specific embryonic time points reveals an early requirement (1–6 somite stage) for all midbrain dopamine (MbDA) neuron specification: early Wnt1 deletion prevents LMX1a expression in the En1-derived domain and depletes MbDA neurons; a late requirement shows Wnt1 regulates birthdating and spatial distribution of MbDA neurons.","method":"Conditional Wnt1 allele, tamoxifen-inducible Cre-mediated deletion at defined time points, genetic lineage analysis, immunofluorescence for Lmx1a, OTX2, dopaminergic markers","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional temporal knockout with lineage tracing and specific molecular and cellular phenotypes; multiple time points in single study","pmids":["23444360"],"is_preprint":false},{"year":2010,"finding":"MTA1s and MTA1 physically interact with Six3 chromatin; Six3 protein is a direct repressor of Wnt1 transcription (HDAC-dependent), and MTA1s/MTA1 relieve this repression by inhibiting Six3 transcription, thereby hyperactivating Wnt1 pathway; deletion of MTA1/MTA1s in MEFs upregulates Six3 and downregulates Wnt signaling.","method":"ChIP assay showing MTA1s/MTA1 on Six3 chromatin; gain- and loss-of-function of MTA1s/MTA1; Six3 knockout MEFs; Wnt1 promoter reporter assay; MTA1s/MTA1 knockout mouse mammary gland analysis","journal":"Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, multiple genetic model systems (MEFs, transgenic mice), reporter assay; single lab","pmids":["20682799"],"is_preprint":false},{"year":2021,"finding":"The m6A methyltransferase Mettl14 enhances Wnt1 protein levels (but not mRNA) through m6A modification of Wnt1 mRNA; Mettl14 overexpression prevents I/R-induced downregulation of Wnt1 and β-catenin, and knockdown of Wnt1 abrogates Mettl14-mediated cardioprotection.","method":"m6A MeRIP-seq/methylation assay, Mettl14 KO mice, adenovirus-mediated Mettl14 overexpression, Wnt1 siRNA rescue, infarct size and cardiac function assays","journal":"Frontiers in Cell and Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m6A modification assay with KO mice and siRNA rescue; single lab","pmids":["35004673"],"is_preprint":false},{"year":2019,"finding":"Lung adenocarcinoma-derived paracrine Wnt1 signals to conventional dendritic cells (cDCs), causing transcriptional silencing of CC/CXC chemokines, T cell exclusion, and cross-tolerance; growth of murine lung adenocarcinomas dependent on cDCs and T cells is profoundly affected by altering Wnt1 expression, demonstrating immune microenvironment regulation by tumor-derived Wnt1.","method":"Wnt1 overexpression/silencing in murine LUAD models, cDC depletion, T cell depletion, siWnt1-nanoparticles, transcriptomic analysis of intratumoral cDCs, cytotoxicity assays","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal genetic and pharmacological approaches, immune cell depletion epistasis, in vivo tumor models, human validation","pmids":["30926812"],"is_preprint":false},{"year":2015,"finding":"WNT1 boosts fracture healing by activating YAP/BMP signaling in osteoblasts within the fracture callus; osteoblast-specific inducible Wnt1 transgenic mice show accelerated fracture healing with increased BMP2 and activated YAP1; recombinant Wnt1 embedded in collagen gel also increases bone regeneration in critical-size bone defects.","method":"Osteoblast-specific inducible Wnt1 transgenic mice with femur osteotomy, transcriptome profiling, immunohistochemistry for YAP1 and BMP2, recombinant Wnt1 protein application","journal":"Journal of Bone and Mineral Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic model plus recombinant protein, transcriptome profiling and IHC; single lab","pmids":["36891752"],"is_preprint":false},{"year":2020,"finding":"DLX2 transcription factor directly binds the WNT1 promoter (confirmed by ChIP assay) and activates Wnt1 transcription, thereby activating Wnt/β-catenin signaling and promoting osteogenic differentiation of human bone marrow mesenchymal stem cells; β-catenin inhibitor FH535 abolishes DLX2-enhanced osteogenesis.","method":"ChIP assay, DLX2 overexpression/knockdown, Wnt1 reporter, ALP activity assay, Alizarin Red mineralization, FH535 inhibitor rescue","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms direct promoter binding, functional rescue with pathway inhibitor; single lab","pmids":["32165291"],"is_preprint":false},{"year":2015,"finding":"WNT1 activates canonical Wnt/β-catenin signaling in macrophages to upregulate CD36 expression via TCF4 and PPAR-γ; β-catenin interacts with PPAR-γ and both PPAR-γ and TCF4 co-localize in the nucleus; Pax3 transcription factor regulates Wnt1 by binding the first binding site in the Wnt1 promoter.","method":"siRNA knockdown of Wnt1, TCF4, PPAR-γ; β-catenin inhibitor; Co-immunoprecipitation; ChIP; immunofluorescence co-localization","journal":"Cellular Physiology and Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, and pharmacological inhibition with multiple orthogonal methods; single lab","pmids":["25721714"],"is_preprint":false},{"year":2010,"finding":"Wnt1 in inflammatory microglia prevents apoptosis during oxidative stress by promoting post-translational phosphorylation of FoxO3a to retain it in the cytoplasm, thereby blocking the FoxO3a-dependent apoptotic cascade (mitochondrial membrane permeability, cytochrome c release, Bad phosphorylation, caspase activation); NF-κB p65 is also required downstream of Wnt1 for microglial survival.","method":"Gene knockdown of Wnt1, FoxO3a, NF-κB p65; Wnt1 signaling blockade; subcellular fractionation; cytochrome c release assay; caspase activity assay; phospho-FoxO3a immunostaining","journal":"Cellular Signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple gene knockdown with apoptotic pathway readouts; single lab","pmids":["20462515"],"is_preprint":false}],"current_model":"WNT1 is a secreted cysteine-rich glycoprotein that primarily activates canonical β-catenin/TCF signaling by inhibiting GSK-3β, leading to β-catenin stabilization and transcription of target genes (including cyclin D1, Cx43, and Wnt target reporters); it is regulated transcriptionally by Lmx1b (downstream of FGF8) and by MTA1/Six3 repressor displacement, and post-translationally by Mettl14-mediated m6A modification; it signals in a juxtacrine mode in bone to drive osteoblast differentiation and suppress osteoclastogenesis independently of LRP5, is negatively regulated by the sFRP FrzA through direct binding, and promotes phosphorylation and proteasomal degradation of c-Myb via the TAK1–HIPK2–NLK kinase cascade, while also transactivating ErbB1 via MMP-mediated ligand shedding and regulating neurogenesis, immune suppression, and fibrosis through context-dependent paracrine β-catenin signaling."},"narrative":{"mechanistic_narrative":"WNT1 is a secreted morphogen that activates canonical Wnt/β-catenin signaling by inhibiting GSK-3β, leading to β-catenin stabilization and TCF/Lef-dependent transcription of target genes [PMID:10748202, PMID:23656646, PMID:23499309]. Through this pathway WNT1 drives cell-cycle entry by stabilizing cyclin D1–CDK4 complexes [PMID:10748202] and induces transcriptional targets including connexin43, which in turn feeds back to limit β-catenin transactivation [PMID:10642594]. In the developing mid-/hindbrain WNT1 functions within the isthmic organizer cross-regulatory network, acting downstream of Lmx1b and upstream of Fgf8 to control precursor proliferation, boundary patterning, and the specification and birthdating of midbrain dopaminergic neurons [PMID:12399317, PMID:17166916, PMID:23444360]; in zebrafish it acts redundantly with Wnt10b to maintain Pax2.1/Fgf8 thresholds at the boundary [PMID:12591239]. A major role is in bone: osteoblast- and mesenchyme-derived WNT1 signals in a short-range juxtacrine mode to promote osteoblast differentiation and suppress osteoclastogenesis, and this bone-anabolic activity proceeds independently of the canonical co-receptor LRP5, also engaging YAP/BMP signaling to drive fracture healing [PMID:30404864, PMID:30690791, PMID:36891752]. Loss-of-function WNT1 mutations cause early-onset osteoporosis and osteogenesis imperfecta, with mutant protein impaired in activating β-catenin signaling and mineralization [PMID:23656646, PMID:23499309]. WNT1 transcription is set by upstream regulators including the MTA1/Six3 repressor axis and DLX2 [PMID:20682799, PMID:32165291], and its protein abundance is enhanced post-transcriptionally by Mettl14-mediated m6A modification [PMID:35004673]. Beyond canonical signaling, WNT1 transactivates ErbB1 via MMP-mediated ligand shedding [PMID:12612606] and triggers TAK1–HIPK2–NLK-dependent phosphorylation and proteasomal degradation of c-Myb [PMID:15082531]. Context-dependent paracrine WNT1 also drives renal myofibroblast activation and fibrosis [PMID:26204899] and remodels the tumor immune microenvironment by silencing dendritic-cell chemokines to promote T-cell exclusion [PMID:30926812].","teleology":[{"year":1999,"claim":"Established that WNT1 signaling is subject to direct extracellular antagonism, defining a negative-regulatory node distinct from intracellular components.","evidence":"Co-IP and TCF/Lef reporter assays showing sFRP FrzA binds WNT1 and blocks β-catenin stabilization","pmids":["10523516"],"confidence":"High","gaps":["Binding interface on WNT1 not mapped","Selectivity over other Wnt ligands not exhaustively tested"]},{"year":2000,"claim":"Defined how WNT1 couples β-catenin signaling to cell-cycle progression, showing GSK-3β inhibition stabilizes cyclin D1 to drive S-phase entry.","evidence":"Overexpression in NIH-3T3 with GSK-3β kinase assay, cyclin D1 immunoblot, BrdU, dominant-negative rescue; plus Cx43 induction in cardiac myocytes","pmids":["10748202","10642594"],"confidence":"High","gaps":["Direct vs indirect GSK-3β regulation not resolved","Cell-type generality of cyclin D1 response unaddressed"]},{"year":2002,"claim":"Placed WNT1 within the isthmic organizer cascade, downstream of Lmx1b and upstream of Fgf8, explaining its role in mid-/hindbrain patterning.","evidence":"RCAS retroviral misexpression and in situ hybridization epistasis in chick; FGF8-bead induction of Lmx1b","pmids":["12399317","10751174"],"confidence":"Medium","gaps":["Gain-of-function only; loss-of-function not tested in this system","Direct vs indirect Fgf8 induction unresolved"]},{"year":2004,"claim":"Revealed non-canonical WNT1 outputs: ErbB1 transactivation via MMP-mediated ligand shedding and TAK1–HIPK2–NLK-driven c-Myb degradation.","evidence":"Conditioned media, MMP inhibitors and ErbB1-blocking antibody; Co-IP, kinase, ubiquitination and proteasome-rescue assays","pmids":["12612606","15082531"],"confidence":"High","gaps":["Receptor/co-receptor link from WNT1 to TAK1 activation not defined","Physiological context of ErbB1 transactivation limited to mammary cells"]},{"year":2006,"claim":"Demonstrated in vivo that WNT1 controls precursor proliferation and dose-dependent expansion of mid-/hindbrain territories, and that Lmx1b is genetically required to maintain Wnt1 expression.","evidence":"En1-promoter Wnt1 transgenic mice with cell-cycle analysis; Lmx1b conventional and conditional knockout with in situ readouts","pmids":["15121182","17166916"],"confidence":"High","gaps":["Mechanism of cell-cycle shortening unresolved","Target genes mediating proliferation not identified"]},{"year":2013,"claim":"Established WNT1 as a temporally staged regulator of midbrain dopaminergic neuron specification and identified WNT1 loss-of-function mutations as a cause of human skeletal disease.","evidence":"Tamoxifen-inducible conditional Wnt1 deletion with lineage tracing; human family genetics with TOPflash and mineralization assays; zebrafish wnt1/wnt10b double-mutant epistasis","pmids":["23444360","23656646","23499309","12591239"],"confidence":"High","gaps":["LRP5-dependence of skeletal signaling not yet tested here","Which downstream targets drive osteoblast vs neuronal phenotypes unresolved"]},{"year":2015,"claim":"Expanded WNT1 into coupling, fibrosis, fracture repair, and immune/survival contexts, showing paracrine and intracellular-effector versatility.","evidence":"Osteoclast TGF-βR knockout; proximal-tubule inducible Wnt1 transgenic; YAP/BMP fracture-healing model; macrophage CD36/PPAR-γ and microglial FoxO3a studies; MTA1/Six3 ChIP","pmids":["26108893","26204899","36891752","25721714","20462515","20682799"],"confidence":"Medium","gaps":["Receptor identity in non-osteoblast contexts often undefined","Crosstalk between β-catenin and YAP/BMP or PPAR-γ not mechanistically dissected"]},{"year":2018,"claim":"Resolved that WNT1's bone-anabolic activity operates by short-range juxtacrine signaling and is independent of the canonical LRP5 co-receptor.","evidence":"Osteoblast- and mesenchyme-specific conditional KO/OE mice, LRP5 epistasis, juxtacrine vs paracrine co-culture, micro-CT and histomorphometry","pmids":["30404864","30690791"],"confidence":"High","gaps":["Identity of the LRP5-independent receptor/co-receptor unknown","Molecular basis of juxtacrine restriction not defined"]},{"year":2019,"claim":"Identified tumor-derived WNT1 as an immunosuppressive signal that excludes T cells by reprogramming dendritic cells.","evidence":"Wnt1 gain/loss in murine LUAD, cDC and T-cell depletion epistasis, siWnt1-nanoparticles, intratumoral cDC transcriptomics","pmids":["30926812"],"confidence":"High","gaps":["DC receptor mediating Wnt1 sensing unidentified","Direct vs β-catenin-independent mechanism in cDCs unresolved"]},{"year":2021,"claim":"Showed WNT1 abundance is set post-transcriptionally, with Mettl14-mediated m6A modification stabilizing WNT1 protein to confer cardioprotection.","evidence":"m6A MeRIP, Mettl14 KO mice, adenoviral overexpression, Wnt1 siRNA rescue, infarct/function readouts","pmids":["35004673"],"confidence":"Medium","gaps":["Mechanism linking m6A to protein (not mRNA) levels unclear","Reader proteins not identified"]},{"year":null,"claim":"The receptor/co-receptor system mediating WNT1's LRP5-independent and non-osteoblast signaling, and how a single ligand selects between β-catenin, YAP/BMP, ErbB1, and kinase-cascade outputs, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No defined receptor for LRP5-independent signaling","Determinants of output selection across tissues unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[2,11,13,14]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,2,3,4]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[14,16,22]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,11]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,10,18]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[21,24]}],"complexes":[],"partners":["FRZA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P04628","full_name":"Proto-oncogene Wnt-1","aliases":["Proto-oncogene Int-1 homolog"],"length_aa":370,"mass_kda":41.0,"function":"Ligand for members of the frizzled family of seven transmembrane receptors (Probable). Acts in the canonical Wnt signaling pathway by promoting beta-catenin-dependent transcriptional activation (PubMed:23499309, PubMed:23656646, PubMed:26902720, PubMed:28528193). In some developmental processes, is also a ligand for the coreceptor RYK, thus triggering Wnt signaling (By similarity). Plays an essential role in the development of the embryonic brain and central nervous system (CNS) (By similarity). Has a role in osteoblast function, bone development and bone homeostasis (PubMed:23499309, PubMed:23656646)","subcellular_location":"Secreted, extracellular space, extracellular matrix; Secreted","url":"https://www.uniprot.org/uniprotkb/P04628/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WNT1","classification":"Not Classified","n_dependent_lines":22,"n_total_lines":1208,"dependency_fraction":0.018211920529801324},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/WNT1","total_profiled":1310},"omim":[{"mim_id":"621396","title":"SPERMATOGENESIS-ASSOCIATED SERINE-RICH PROTEIN 1; SPATS1","url":"https://www.omim.org/entry/621396"},{"mim_id":"617813","title":"TRANSMEMBRANE PROTEIN 88; TMEM88","url":"https://www.omim.org/entry/617813"},{"mim_id":"615221","title":"BONE MINERAL DENSITY QUANTITATIVE 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cells.","date":"2017","source":"Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/28618940","citation_count":23,"is_preprint":false},{"pmid":"20710043","id":"PMC_20710043","title":"Metastasis-associated protein 1 short form stimulates Wnt1 pathway in mammary epithelial and cancer cells.","date":"2010","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/20710043","citation_count":23,"is_preprint":false},{"pmid":"36595228","id":"PMC_36595228","title":"Genotypic and Phenotypic Spectrum and Pathogenesis of WNT1 Variants in a Large Cohort of Patients With OI/Osteoporosis.","date":"2023","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/36595228","citation_count":22,"is_preprint":false},{"pmid":"15703844","id":"PMC_15703844","title":"Identification and characterization of rat Wnt1 and Wnt10b genes in silico.","date":"2005","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/15703844","citation_count":22,"is_preprint":false},{"pmid":"38340578","id":"PMC_38340578","title":"Bufalin suppresses hepatocellular carcinogenesis by targeting M2 macrophage-governed Wnt1/β-catenin signaling.","date":"2024","source":"Phytomedicine : international journal of phytotherapy and phytopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38340578","citation_count":21,"is_preprint":false},{"pmid":"20107508","id":"PMC_20107508","title":"Pea3 transcription factors and wnt1-induced mouse mammary neoplasia.","date":"2010","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/20107508","citation_count":21,"is_preprint":false},{"pmid":"33026174","id":"PMC_33026174","title":"MicroRNA-148a-3p suppresses epithelial-to-mesenchymal transition and stemness properties via Wnt1-mediated Wnt/β-catenin pathway in pancreatic cancer.","date":"2020","source":"Journal of cellular and molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/33026174","citation_count":20,"is_preprint":false},{"pmid":"30756509","id":"PMC_30756509","title":"Aspirin ameliorates lung cancer by targeting the miR-98/WNT1 axis.","date":"2019","source":"Thoracic cancer","url":"https://pubmed.ncbi.nlm.nih.gov/30756509","citation_count":20,"is_preprint":false},{"pmid":"32088641","id":"PMC_32088641","title":"MiR-145-5p mitigates dysregulated Wnt1/β-catenin signaling pathway in rheumatoid arthritis.","date":"2020","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/32088641","citation_count":20,"is_preprint":false},{"pmid":"32165291","id":"PMC_32165291","title":"DLX2 activates Wnt1 transcription and mediates Wnt/β-catenin signal to promote osteogenic differentiation of hBMSCs.","date":"2020","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/32165291","citation_count":20,"is_preprint":false},{"pmid":"35603707","id":"PMC_35603707","title":"Wnt family member 1 (Wnt1) overexpression-induced M2 polarization of microglia alleviates inflammation-sensitized neonatal brain injuries.","date":"2022","source":"Bioengineered","url":"https://pubmed.ncbi.nlm.nih.gov/35603707","citation_count":20,"is_preprint":false},{"pmid":"36891752","id":"PMC_36891752","title":"Wnt1 Boosts Fracture Healing by Enhancing Bone Formation in the Fracture Callus.","date":"2023","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/36891752","citation_count":19,"is_preprint":false},{"pmid":"36827869","id":"PMC_36827869","title":"KLF3 Transcription Activates WNT1 and Promotes the Growth and Metastasis of Gastric Cancer via Activation of the WNT/β-Catenin Signaling Pathway.","date":"2023","source":"Laboratory investigation; a journal of technical methods and pathology","url":"https://pubmed.ncbi.nlm.nih.gov/36827869","citation_count":19,"is_preprint":false},{"pmid":"25197350","id":"PMC_25197350","title":"Sox9 regulates hyperexpression of Wnt1 and Fzd1 in human osteosarcoma tissues and cells.","date":"2014","source":"International journal of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/25197350","citation_count":19,"is_preprint":false},{"pmid":"34545072","id":"PMC_34545072","title":"Long noncoding RNA DLGAP1-AS2 facilitates Wnt1 transcription through physically interacting with Six3 and drives the malignancy of gastric cancer.","date":"2021","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/34545072","citation_count":19,"is_preprint":false},{"pmid":"33189914","id":"PMC_33189914","title":"Osteoblastic Wnt1 regulates periosteal bone formation in adult mice.","date":"2020","source":"Bone","url":"https://pubmed.ncbi.nlm.nih.gov/33189914","citation_count":18,"is_preprint":false},{"pmid":"28122483","id":"PMC_28122483","title":"Progesterone-Induced miR-152 Inhibits the Proliferation of Endometrial Epithelial Cells by Downregulating WNT-1.","date":"2017","source":"Reproductive sciences (Thousand Oaks, Calif.)","url":"https://pubmed.ncbi.nlm.nih.gov/28122483","citation_count":18,"is_preprint":false},{"pmid":"32009419","id":"PMC_32009419","title":"LncRNA HOXA11-AS promotes migration and invasion through modulating miR-148a/WNT1/β-catenin pathway in gastric cancer.","date":"2020","source":"Neoplasma","url":"https://pubmed.ncbi.nlm.nih.gov/32009419","citation_count":18,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54448,"output_tokens":6867,"usd":0.133175,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15900,"output_tokens":3834,"usd":0.087675,"stage2_stop_reason":"end_turn"},"total_usd":0.22085,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"FrzA (a secreted frizzled-related protein, sFRP) specifically binds to WNT1 protein but not WNT5a, and this binding inhibits WNT1-mediated stabilization of cytoplasmic β-catenin and WNT1-induced transcription from a Lef/TCF reporter gene, acting as a negative regulator of WNT1 signaling.\",\n      \"method\": \"Co-immunoprecipitation, co-culture binding assays, β-catenin immunoblotting, TCF/Lef luciferase reporter assay\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays, multiple orthogonal functional readouts (β-catenin levels, reporter transcription), single lab\",\n      \"pmids\": [\"10523516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"WNT1 signaling in cardiac myocytes induces Cx43 (connexin43) mRNA and protein expression transcriptionally via β-catenin accumulation; the accumulated Cx43 co-localizes with β-catenin at junctional membranes and reduces β-catenin transactivation potential, creating a feedback mechanism.\",\n      \"method\": \"Co-culture with Wnt1-secreting cells, Li+ treatment mimicking Wnt signaling, Cx43 promoter-reporter transfection, Lucifer Yellow dye transfer, calcium wave propagation assay, immunolocalization\",\n      \"journal\": \"The Journal of Clinical Investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, dye transfer, co-localization, co-culture), single lab\",\n      \"pmids\": [\"10642594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"WNT1 inhibits GSK-3β activity, leading to decreased cyclin D1 proteolysis and hyperaccumulation of active cyclin D1–CDK4 complexes; co-expression of WNT1 with activated MEK1 drives cyclin D1 accumulation and S-phase entry in the absence of serum growth factors, and a dominant-negative cyclin D1 mutant blocks this effect.\",\n      \"method\": \"Overexpression in NIH-3T3 cells, GSK-3β kinase assay, cyclin D1 immunoblotting, S-phase BrdU incorporation, dominant-negative cyclin D1 rescue\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase assay, rescue experiment with dominant-negative, multiple readouts, single lab\",\n      \"pmids\": [\"10748202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Constitutive WNT1 expression in HC11 mammary epithelial cells activates TCF transcriptional activity and transactivates ErbB1 via MMP-mediated release of soluble ErbB1 ligands (blocked by anti-ErbB1 antibody and MMP inhibitors), leading to MAPK activation and increased cyclin D1 levels.\",\n      \"method\": \"Conditioned media transfer, ErbB1 phosphorylation assays, MMP inhibitor treatment, ErbB1-blocking antibody, MAPK assay, cyclin D1 immunoblot\",\n      \"journal\": \"EMBO Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and antibody inhibition, conditioned media experiments; single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"12612606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"WNT1 signal causes nuclear entry of TAK1, which activates HIPK2 and NLK; NLK binds directly to c-Myb together with HIPK2, resulting in phosphorylation of c-Myb at multiple sites followed by ubiquitination and proteasome-dependent degradation, thereby suppressing c-Myb transcriptional activity.\",\n      \"method\": \"Co-immunoprecipitation, kinase assays, ubiquitination assay, proteasome inhibitor rescue, NLK overexpression in M1 cells\",\n      \"journal\": \"Genes & Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay, direct protein-protein interaction by Co-IP, ubiquitination assay, functional rescue with proteasome inhibitor; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"15082531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"WNT1 cooperates with insulin/IGF signaling via GSK-3 inhibition to activate canonical Wnt/β-catenin signaling (nuclear β-catenin accumulation) in C2 myoblasts, promoting MyoD and myogenin expression, reserve cell activation, and myotube hypertrophy through increased reserve cell fusion.\",\n      \"method\": \"Co-culture with Wnt1-expressing fibroblasts, LiCl/SB216763 GSK-3 inhibition, nuclear β-catenin immunostaining, MyoD/myogenin immunofluorescence, myotube size quantification\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell co-culture, pharmacological mimicry, immunostaining with multiple readouts; single lab\",\n      \"pmids\": [\"15282335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Ectopic WNT1 expression in the caudal midbrain induces overproliferation of precursor cells in a gene dosage-dependent manner by shortening cell cycle length, and in adults promotes cell size increase specifically in neurons, demonstrating WNT1 acts as a regulator of proliferation of specific precursor populations in the mid-/hindbrain.\",\n      \"method\": \"Transgenic mice expressing Wnt1 under En1 promoter, BrdU/cell cycle length analysis, cell size morphometry, FACS\",\n      \"journal\": \"Molecular and Cellular Neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vivo transgenic overexpression with cell cycle readout; single lab, single model system\",\n      \"pmids\": [\"15121182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In zebrafish hindbrain, Wnt1 (expressed at boundary and roof plate cells) activates proneural and delta gene expression to promote neurogenesis in non-boundary regions, and this neurogenesis/Notch-mediated lateral inhibition prevents ectopic boundary cell formation; Rfng modulates Notch signaling and is required for wnt1 expression at hindbrain boundaries.\",\n      \"method\": \"Morpholino knockdown of wnt1 and tcf3b, rfng knockdown, in situ hybridization for boundary markers (rfng, foxb1.2), epistasis analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morpholino loss-of-function with multiple marker readouts and epistasis; single lab\",\n      \"pmids\": [\"15659486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The transcription factor Lmx1b maintains Wnt1 expression in the isthmic organizer: FGF8 induces Lmx1b expression, and Lmx1b in turn sustains Wnt1 expression; retroviral Lmx1b expression maintains Wnt1 in the mesencephalon, but ectopic Wnt1 does not recapitulate Lmx1b effects on mesencephalic morphology.\",\n      \"method\": \"In situ hybridization, FGF8-soaked bead implantation, RCAS retroviral misexpression of Lmx1b and Wnt1 in chick embryos\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function retroviral misexpression with in situ validation; single lab\",\n      \"pmids\": [\"10751174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Misexpression of Lmx1b or Wnt1 in chick embryos causes expansion of tectum and cerebellum; Lmx1b induces Wnt1 expression, and Wnt1 in turn induces Fgf8 expression non-cell-autonomously, placing Wnt1 downstream of Lmx1b and upstream of Fgf8 in the isthmic organizer gene cascade.\",\n      \"method\": \"RCAS retroviral misexpression in chick, in situ hybridization for Fgf8, Wnt1, Lmx1b expression\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain-of-function with epistasis analysis; single lab\",\n      \"pmids\": [\"12399317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Lmx1b is essential for Fgf8 and Wnt1 expression at the midbrain-hindbrain boundary: Lmx1b-/- embryos show complete absence of Fgf8 and downregulation of Wnt1 before the 4-somite stage; conditional region-specific knockout confirmed Lmx1b acts upstream of both Wnt1 and Fgf8 in the isthmic organizer cross-regulatory network.\",\n      \"method\": \"Lmx1b knockout mice, Wnt1-Cre conditional knockout, in situ hybridization, quantitative gene expression analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conventional and conditional knockout with multiple gene expression readouts; replicated across genetic approaches in single study\",\n      \"pmids\": [\"17166916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WNT1 missense mutations (p.Cys218Gly and p.Val355Phe identified in families with early-onset osteoporosis and osteogenesis imperfecta) show impaired capacity to induce canonical WNT/β-catenin signaling and target gene expression and mineralization in vitro; lineage tracing identified Wnt1 expression in osteocytes in mice.\",\n      \"method\": \"TOPflash luciferase reporter assay in cells transfected with mutant WNT1, mineralization assay, lineage tracing in mice\",\n      \"journal\": \"The New England Journal of Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function mutations with in vitro reporter assay and mineralization readout; replicated across two independent families and confirmed in separate study (PMID:23499309)\",\n      \"pmids\": [\"23656646\", \"23499309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Hypofunctional WNT1 alleles (frameshift, missense, splice-site, nonsense) cause failure to activate canonical LRP5-mediated WNT/β-catenin signaling; in vitro osteoblast differentiation shows enhanced Wnt1 expression with advancing differentiation, indicating a role in osteoblast function.\",\n      \"method\": \"Functional analysis of WNT1 variants in cell-based reporter assays; osteoblast differentiation assays\",\n      \"journal\": \"American Journal of Human Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with multiple alleles, single lab, complementary human genetics\",\n      \"pmids\": [\"23499309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Inactivation of Wnt1 specifically in osteoblasts causes severe osteoporosis and spontaneous fractures in mice, while conditional Wnt1 expression in osteoblasts increases osteoblast numbers and function; critically, the bone-anabolic effect of Wnt1 does not require LRP5, demonstrating Wnt1 can signal independently of this canonical co-receptor.\",\n      \"method\": \"Osteoblast-specific conditional knockout and conditional overexpression mouse models, micro-CT, histomorphometry, LRP5 knockout epistasis experiment\",\n      \"journal\": \"Science Translational Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional KO and OE with specific phenotype, LRP5 epistasis establishing co-receptor independence; multiple genetic models in one study\",\n      \"pmids\": [\"30404864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mesenchymal cell-derived WNT1 signals strictly in a juxtacrine (short-range) manner to induce osteoblast differentiation and suppress osteoclastogenesis, in part via canonical Wnt signaling; deletion of Wnt1 in limb mesenchymal progenitors leads to spontaneous fractures due to impaired osteoblast function and increased bone resorption.\",\n      \"method\": \"Global and limb-bud mesenchymal conditional Wnt1 knockout mice, co-culture juxtacrine vs. paracrine assays, histomorphometry, osteoclast differentiation assays\",\n      \"journal\": \"Journal of Bone and Mineral Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined cellular phenotype, juxtacrine signaling mode established by co-culture design; multiple orthogonal methods\",\n      \"pmids\": [\"30690791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Osteoclast TGF-β receptor signaling induces Wnt1 expression in osteoclasts; osteoclast-specific inhibition of TGF-β receptor signaling reduces Wnt1 expression and osteoblast numbers, coupling bone resorption to formation via osteoclast-derived Wnt1.\",\n      \"method\": \"Osteoclast-specific TGF-β receptor knockout mice, Wnt1 expression analysis in osteoclasts, osteoblast number histomorphometry, TGF-β stimulation assays\",\n      \"journal\": \"Journal of Bone and Mineral Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockout with defined cellular and tissue-level phenotype; single lab\",\n      \"pmids\": [\"26108893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Proximal tubule-specific inducible secretion of Wnt1 in mice is sufficient to drive interstitial myofibroblast activation, proliferation, and matrix protein production in kidneys without inflammatory cytokine expression or leukocyte infiltration, demonstrating that epithelial-derived Wnt1 drives renal fibrosis via paracrine canonical Wnt signaling.\",\n      \"method\": \"Inducible proximal-tubule Wnt1-expressing transgenic mouse, histology, myofibroblast marker staining, cytokine profiling, Wnt target gene expression in isolated PDGFR-β+ myofibroblasts\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — novel transgenic model with clean paracrine secretion, multiple tissue readouts; single lab but rigorous design\",\n      \"pmids\": [\"26204899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WNT1 in zebrafish acts redundantly with Wnt10b at the midbrain-hindbrain boundary (MHB): combined deletion/knockdown of wnt1 and wnt10b abolishes pax2.1, en2, and her5 expression in the ventral MHB; wnt1/wnt10b maintain threshold levels of Pax2.1 and Fgf8, and embryos deficient in both loci are sensitized to Pax2.1 or Fgf8 reduction.\",\n      \"method\": \"Deficiency allele generation, morpholino antisense knockdown, double-mutant epistasis with pax2.1 and fgf8 alleles, in situ hybridization\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic deletion plus morpholino with epistasis; single lab\",\n      \"pmids\": [\"12591239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Conditional deletion of Wnt1 at specific embryonic time points reveals an early requirement (1–6 somite stage) for all midbrain dopamine (MbDA) neuron specification: early Wnt1 deletion prevents LMX1a expression in the En1-derived domain and depletes MbDA neurons; a late requirement shows Wnt1 regulates birthdating and spatial distribution of MbDA neurons.\",\n      \"method\": \"Conditional Wnt1 allele, tamoxifen-inducible Cre-mediated deletion at defined time points, genetic lineage analysis, immunofluorescence for Lmx1a, OTX2, dopaminergic markers\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional temporal knockout with lineage tracing and specific molecular and cellular phenotypes; multiple time points in single study\",\n      \"pmids\": [\"23444360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MTA1s and MTA1 physically interact with Six3 chromatin; Six3 protein is a direct repressor of Wnt1 transcription (HDAC-dependent), and MTA1s/MTA1 relieve this repression by inhibiting Six3 transcription, thereby hyperactivating Wnt1 pathway; deletion of MTA1/MTA1s in MEFs upregulates Six3 and downregulates Wnt signaling.\",\n      \"method\": \"ChIP assay showing MTA1s/MTA1 on Six3 chromatin; gain- and loss-of-function of MTA1s/MTA1; Six3 knockout MEFs; Wnt1 promoter reporter assay; MTA1s/MTA1 knockout mouse mammary gland analysis\",\n      \"journal\": \"Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, multiple genetic model systems (MEFs, transgenic mice), reporter assay; single lab\",\n      \"pmids\": [\"20682799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The m6A methyltransferase Mettl14 enhances Wnt1 protein levels (but not mRNA) through m6A modification of Wnt1 mRNA; Mettl14 overexpression prevents I/R-induced downregulation of Wnt1 and β-catenin, and knockdown of Wnt1 abrogates Mettl14-mediated cardioprotection.\",\n      \"method\": \"m6A MeRIP-seq/methylation assay, Mettl14 KO mice, adenovirus-mediated Mettl14 overexpression, Wnt1 siRNA rescue, infarct size and cardiac function assays\",\n      \"journal\": \"Frontiers in Cell and Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m6A modification assay with KO mice and siRNA rescue; single lab\",\n      \"pmids\": [\"35004673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Lung adenocarcinoma-derived paracrine Wnt1 signals to conventional dendritic cells (cDCs), causing transcriptional silencing of CC/CXC chemokines, T cell exclusion, and cross-tolerance; growth of murine lung adenocarcinomas dependent on cDCs and T cells is profoundly affected by altering Wnt1 expression, demonstrating immune microenvironment regulation by tumor-derived Wnt1.\",\n      \"method\": \"Wnt1 overexpression/silencing in murine LUAD models, cDC depletion, T cell depletion, siWnt1-nanoparticles, transcriptomic analysis of intratumoral cDCs, cytotoxicity assays\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal genetic and pharmacological approaches, immune cell depletion epistasis, in vivo tumor models, human validation\",\n      \"pmids\": [\"30926812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"WNT1 boosts fracture healing by activating YAP/BMP signaling in osteoblasts within the fracture callus; osteoblast-specific inducible Wnt1 transgenic mice show accelerated fracture healing with increased BMP2 and activated YAP1; recombinant Wnt1 embedded in collagen gel also increases bone regeneration in critical-size bone defects.\",\n      \"method\": \"Osteoblast-specific inducible Wnt1 transgenic mice with femur osteotomy, transcriptome profiling, immunohistochemistry for YAP1 and BMP2, recombinant Wnt1 protein application\",\n      \"journal\": \"Journal of Bone and Mineral Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic model plus recombinant protein, transcriptome profiling and IHC; single lab\",\n      \"pmids\": [\"36891752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DLX2 transcription factor directly binds the WNT1 promoter (confirmed by ChIP assay) and activates Wnt1 transcription, thereby activating Wnt/β-catenin signaling and promoting osteogenic differentiation of human bone marrow mesenchymal stem cells; β-catenin inhibitor FH535 abolishes DLX2-enhanced osteogenesis.\",\n      \"method\": \"ChIP assay, DLX2 overexpression/knockdown, Wnt1 reporter, ALP activity assay, Alizarin Red mineralization, FH535 inhibitor rescue\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms direct promoter binding, functional rescue with pathway inhibitor; single lab\",\n      \"pmids\": [\"32165291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"WNT1 activates canonical Wnt/β-catenin signaling in macrophages to upregulate CD36 expression via TCF4 and PPAR-γ; β-catenin interacts with PPAR-γ and both PPAR-γ and TCF4 co-localize in the nucleus; Pax3 transcription factor regulates Wnt1 by binding the first binding site in the Wnt1 promoter.\",\n      \"method\": \"siRNA knockdown of Wnt1, TCF4, PPAR-γ; β-catenin inhibitor; Co-immunoprecipitation; ChIP; immunofluorescence co-localization\",\n      \"journal\": \"Cellular Physiology and Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, and pharmacological inhibition with multiple orthogonal methods; single lab\",\n      \"pmids\": [\"25721714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Wnt1 in inflammatory microglia prevents apoptosis during oxidative stress by promoting post-translational phosphorylation of FoxO3a to retain it in the cytoplasm, thereby blocking the FoxO3a-dependent apoptotic cascade (mitochondrial membrane permeability, cytochrome c release, Bad phosphorylation, caspase activation); NF-κB p65 is also required downstream of Wnt1 for microglial survival.\",\n      \"method\": \"Gene knockdown of Wnt1, FoxO3a, NF-κB p65; Wnt1 signaling blockade; subcellular fractionation; cytochrome c release assay; caspase activity assay; phospho-FoxO3a immunostaining\",\n      \"journal\": \"Cellular Signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple gene knockdown with apoptotic pathway readouts; single lab\",\n      \"pmids\": [\"20462515\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WNT1 is a secreted cysteine-rich glycoprotein that primarily activates canonical β-catenin/TCF signaling by inhibiting GSK-3β, leading to β-catenin stabilization and transcription of target genes (including cyclin D1, Cx43, and Wnt target reporters); it is regulated transcriptionally by Lmx1b (downstream of FGF8) and by MTA1/Six3 repressor displacement, and post-translationally by Mettl14-mediated m6A modification; it signals in a juxtacrine mode in bone to drive osteoblast differentiation and suppress osteoclastogenesis independently of LRP5, is negatively regulated by the sFRP FrzA through direct binding, and promotes phosphorylation and proteasomal degradation of c-Myb via the TAK1–HIPK2–NLK kinase cascade, while also transactivating ErbB1 via MMP-mediated ligand shedding and regulating neurogenesis, immune suppression, and fibrosis through context-dependent paracrine β-catenin signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"WNT1 is a secreted morphogen that activates canonical Wnt/\\u03b2-catenin signaling by inhibiting GSK-3\\u03b2, leading to \\u03b2-catenin stabilization and TCF/Lef-dependent transcription of target genes [#2, #11]. Through this pathway WNT1 drives cell-cycle entry by stabilizing cyclin D1\\u2013CDK4 complexes [#2] and induces transcriptional targets including connexin43, which in turn feeds back to limit \\u03b2-catenin transactivation [#1]. In the developing mid-/hindbrain WNT1 functions within the isthmic organizer cross-regulatory network, acting downstream of Lmx1b and upstream of Fgf8 to control precursor proliferation, boundary patterning, and the specification and birthdating of midbrain dopaminergic neurons [#9, #10, #18]; in zebrafish it acts redundantly with Wnt10b to maintain Pax2.1/Fgf8 thresholds at the boundary [#17]. A major role is in bone: osteoblast- and mesenchyme-derived WNT1 signals in a short-range juxtacrine mode to promote osteoblast differentiation and suppress osteoclastogenesis, and this bone-anabolic activity proceeds independently of the canonical co-receptor LRP5, also engaging YAP/BMP signaling to drive fracture healing [#13, #14, #22]. Loss-of-function WNT1 mutations cause early-onset osteoporosis and osteogenesis imperfecta, with mutant protein impaired in activating \\u03b2-catenin signaling and mineralization [#11, #12]. WNT1 transcription is set by upstream regulators including the MTA1/Six3 repressor axis and DLX2 [#19, #23], and its protein abundance is enhanced post-transcriptionally by Mettl14-mediated m6A modification [#20]. Beyond canonical signaling, WNT1 transactivates ErbB1 via MMP-mediated ligand shedding [#3] and triggers TAK1\\u2013HIPK2\\u2013NLK-dependent phosphorylation and proteasomal degradation of c-Myb [#4]. Context-dependent paracrine WNT1 also drives renal myofibroblast activation and fibrosis [#16] and remodels the tumor immune microenvironment by silencing dendritic-cell chemokines to promote T-cell exclusion [#21].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that WNT1 signaling is subject to direct extracellular antagonism, defining a negative-regulatory node distinct from intracellular components.\",\n      \"evidence\": \"Co-IP and TCF/Lef reporter assays showing sFRP FrzA binds WNT1 and blocks \\u03b2-catenin stabilization\",\n      \"pmids\": [\"10523516\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface on WNT1 not mapped\", \"Selectivity over other Wnt ligands not exhaustively tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined how WNT1 couples \\u03b2-catenin signaling to cell-cycle progression, showing GSK-3\\u03b2 inhibition stabilizes cyclin D1 to drive S-phase entry.\",\n      \"evidence\": \"Overexpression in NIH-3T3 with GSK-3\\u03b2 kinase assay, cyclin D1 immunoblot, BrdU, dominant-negative rescue; plus Cx43 induction in cardiac myocytes\",\n      \"pmids\": [\"10748202\", \"10642594\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect GSK-3\\u03b2 regulation not resolved\", \"Cell-type generality of cyclin D1 response unaddressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Placed WNT1 within the isthmic organizer cascade, downstream of Lmx1b and upstream of Fgf8, explaining its role in mid-/hindbrain patterning.\",\n      \"evidence\": \"RCAS retroviral misexpression and in situ hybridization epistasis in chick; FGF8-bead induction of Lmx1b\",\n      \"pmids\": [\"12399317\", \"10751174\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Gain-of-function only; loss-of-function not tested in this system\", \"Direct vs indirect Fgf8 induction unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Revealed non-canonical WNT1 outputs: ErbB1 transactivation via MMP-mediated ligand shedding and TAK1\\u2013HIPK2\\u2013NLK-driven c-Myb degradation.\",\n      \"evidence\": \"Conditioned media, MMP inhibitors and ErbB1-blocking antibody; Co-IP, kinase, ubiquitination and proteasome-rescue assays\",\n      \"pmids\": [\"12612606\", \"15082531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor/co-receptor link from WNT1 to TAK1 activation not defined\", \"Physiological context of ErbB1 transactivation limited to mammary cells\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated in vivo that WNT1 controls precursor proliferation and dose-dependent expansion of mid-/hindbrain territories, and that Lmx1b is genetically required to maintain Wnt1 expression.\",\n      \"evidence\": \"En1-promoter Wnt1 transgenic mice with cell-cycle analysis; Lmx1b conventional and conditional knockout with in situ readouts\",\n      \"pmids\": [\"15121182\", \"17166916\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of cell-cycle shortening unresolved\", \"Target genes mediating proliferation not identified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established WNT1 as a temporally staged regulator of midbrain dopaminergic neuron specification and identified WNT1 loss-of-function mutations as a cause of human skeletal disease.\",\n      \"evidence\": \"Tamoxifen-inducible conditional Wnt1 deletion with lineage tracing; human family genetics with TOPflash and mineralization assays; zebrafish wnt1/wnt10b double-mutant epistasis\",\n      \"pmids\": [\"23444360\", \"23656646\", \"23499309\", \"12591239\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"LRP5-dependence of skeletal signaling not yet tested here\", \"Which downstream targets drive osteoblast vs neuronal phenotypes unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Expanded WNT1 into coupling, fibrosis, fracture repair, and immune/survival contexts, showing paracrine and intracellular-effector versatility.\",\n      \"evidence\": \"Osteoclast TGF-\\u03b2R knockout; proximal-tubule inducible Wnt1 transgenic; YAP/BMP fracture-healing model; macrophage CD36/PPAR-\\u03b3 and microglial FoxO3a studies; MTA1/Six3 ChIP\",\n      \"pmids\": [\"26108893\", \"26204899\", \"36891752\", \"25721714\", \"20462515\", \"20682799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor identity in non-osteoblast contexts often undefined\", \"Crosstalk between \\u03b2-catenin and YAP/BMP or PPAR-\\u03b3 not mechanistically dissected\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved that WNT1's bone-anabolic activity operates by short-range juxtacrine signaling and is independent of the canonical LRP5 co-receptor.\",\n      \"evidence\": \"Osteoblast- and mesenchyme-specific conditional KO/OE mice, LRP5 epistasis, juxtacrine vs paracrine co-culture, micro-CT and histomorphometry\",\n      \"pmids\": [\"30404864\", \"30690791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the LRP5-independent receptor/co-receptor unknown\", \"Molecular basis of juxtacrine restriction not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified tumor-derived WNT1 as an immunosuppressive signal that excludes T cells by reprogramming dendritic cells.\",\n      \"evidence\": \"Wnt1 gain/loss in murine LUAD, cDC and T-cell depletion epistasis, siWnt1-nanoparticles, intratumoral cDC transcriptomics\",\n      \"pmids\": [\"30926812\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DC receptor mediating Wnt1 sensing unidentified\", \"Direct vs \\u03b2-catenin-independent mechanism in cDCs unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed WNT1 abundance is set post-transcriptionally, with Mettl14-mediated m6A modification stabilizing WNT1 protein to confer cardioprotection.\",\n      \"evidence\": \"m6A MeRIP, Mettl14 KO mice, adenoviral overexpression, Wnt1 siRNA rescue, infarct/function readouts\",\n      \"pmids\": [\"35004673\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking m6A to protein (not mRNA) levels unclear\", \"Reader proteins not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The receptor/co-receptor system mediating WNT1's LRP5-independent and non-osteoblast signaling, and how a single ligand selects between \\u03b2-catenin, YAP/BMP, ErbB1, and kinase-cascade outputs, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No defined receptor for LRP5-independent signaling\", \"Determinants of output selection across tissues unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [2, 11, 13, 14]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 2, 3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [14, 16, 22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 10, 18]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [21, 24]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FrzA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}