{"gene":"DVL1","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":1997,"finding":"Dvl1 knockout mice are viable and fertile but exhibit deficits in social interaction (whisker trimming, nest-building, huddling, social dominance) and sensorimotor gating (prepulse inhibition), establishing Dvl1's role in complex social and sensorimotor behaviors in vivo.","method":"Gene targeting knockout mouse, behavioral testing","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific behavioral phenotypic readouts, replicated across institutions","pmids":["9298901","14960015"],"is_preprint":false},{"year":2003,"finding":"CKIε phosphorylates Dvl-1 and enhances its binding to Frat-1 via the amino acid region 228–250 of Dvl-1; this Dvl-1/Frat-1 complex cooperatively activates β-catenin accumulation and TCF-4 transcriptional activity. CKIε knockdown blocks Wnt-3a-induced Dvl phosphorylation, Dvl-1/Frat-1 binding, and β-catenin accumulation.","method":"Co-immunoprecipitation, deletion mutant analysis, TOPFlash/TCF luciferase reporter assay, RNAi knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, mutagenesis, reporter assay, RNAi) in single rigorous study","pmids":["12556519"],"is_preprint":false},{"year":2011,"finding":"DVL1 inhibits PCP signaling by inducing hyperphosphorylation of Frizzled3 and preventing its internalization; Vangl2 antagonizes this by reducing Frizzled3 phosphorylation and promoting internalization, thereby sharpening PCP gradient sensing in commissural axon growth cones.","method":"In vivo axon guidance assays, overexpression/knockdown, phosphorylation assays, localization studies in growth cones","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with functional phenotypic readout and mechanistic follow-up","pmids":["21316586"],"is_preprint":false},{"year":1999,"finding":"DVL1 interacts with EPS8 (an EGFR substrate) through its PDZ domain; this interaction leads to DVL1 hyperphosphorylation and inhibition of EGFR-stimulated tyrosine phosphorylation of EPS8, linking DVL1 to receptor tyrosine kinase signaling.","method":"Yeast two-hybrid screening, in vitro binding assay, co-transfection/phosphorylation assay, immunohistochemistry","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — yeast two-hybrid plus in vitro binding and phosphorylation assay, single lab","pmids":["10581192"],"is_preprint":false},{"year":2010,"finding":"The DIX domain of DVL1 forms a protein complex with the DIX domain of Axin1; co-expression stabilizes both otherwise unstable DIX fragments and the complex was confirmed by affinity chromatography and size-exclusion chromatography with preliminary crystallization.","method":"Co-expression in multi-cistronic system, affinity chromatography, SEC, crystallization","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 1–2 — biochemical reconstitution and complex formation confirmed by multiple methods, single lab","pmids":["20846493"],"is_preprint":false},{"year":2015,"finding":"Heterozygous DVL1 frameshift mutations in exon 14 (penultimate exon) escape nonsense-mediated decay and generate a C-terminally truncated protein that causes autosomal-dominant Robinow syndrome; mutant allele expression confirmed in patient leukocytes.","method":"Whole-exome sequencing, Sanger sequencing, transcript analysis from patient leukocytes","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple families, transcript-level validation, de novo variant confirmation","pmids":["25817016"],"is_preprint":false},{"year":2015,"finding":"De novo DVL1 frameshift mutations that delete the C-terminus and replace it with a novel basic sequence cause the osteosclerotic Robinow syndrome subtype (RS-OS); in vitro TOPFlash assays show the mutant allele alone is less active than wild-type, but co-expression of mutant and wild-type alleles increases canonical Wnt activity ~2-fold, suggesting a dominant gain-of-function interaction.","method":"Whole-exome sequencing, GFP-tagged construct transfection, protein stability assay, TOPFlash canonical Wnt reporter assay","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1–2 — functional in vitro reporter assays with mutagenesis plus patient genetics, single lab","pmids":["25817014"],"is_preprint":false},{"year":2016,"finding":"Wnt5a signals specifically through DVL1 (not other DVL paralogs) to accumulate DVL1 in nucleolar organizer regions (NORs), where DVL1 binds rDNA loci; upon DVL1 binding, SIRT7 releases from rDNA and the RNA Pol I transcription machinery disassembles, repressing ribosomal DNA transcription.","method":"siRNA knockdown of individual DVLs, chromatin immunoprecipitation (ChIP) for rDNA, co-localization by immunofluorescence, Pol I transcription assay","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (ChIP, co-localization, functional transcription assay, paralog-specific knockdown)","pmids":["27500936"],"is_preprint":false},{"year":2016,"finding":"Dvl1 loss-of-function (knockout) in mice causes Paneth cell reduction and mislocalization, increased CD8+ T cells in the lamina propria, and prolonged gut transit time; bone marrow chimera experiments showed both epithelial and immune cell abnormalities are required for GI dysfunction, placing Dvl1 in dual epithelial and immune regulation of intestinal homeostasis.","method":"Dvl1-/- knockout mice, bone marrow chimera, gut microbiota manipulation, histology","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with bone marrow chimera epistasis and multiple cellular phenotype readouts","pmids":["27525310"],"is_preprint":false},{"year":2018,"finding":"DVL-1 enters the nucleus and localizes to at least two CYP19A1 (aromatase) promoters (pII and I.4); DVL-1 loss-of-function leads to differential changes in aromatase transcript levels and estrogen production in breast cancer cells.","method":"ChIP at CYP19A1 promoters, siRNA knockdown, RT-PCR, estrogen production assay","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus functional knockdown with transcript and hormone readouts, single lab","pmids":["30479694"],"is_preprint":false},{"year":2018,"finding":"Neuroglobin directly interacts with DVL1 (confirmed by co-immunoprecipitation), colocalizes with it in cytoplasm and nucleus, and promotes proteasomal degradation of DVL1, thereby inhibiting DVL1-mediated β-catenin/Wnt and DVL1-mediated suppression of NFκB signaling.","method":"Co-immunoprecipitation, co-localization by immunofluorescence, TOPFlash reporter assay, proteasome inhibitor treatment","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP plus reporter assay and proteasomal degradation assay, single lab","pmids":["30041403"],"is_preprint":false},{"year":2019,"finding":"DVL-1 is acetylated at 12 lysine residues; acetylation of K69 (DIX domain) and K285 (PDZ domain) promotes nuclear over cytoplasmic localization of DVL-1 and influences its binding to gene promoters in triple-negative breast cancer cells.","method":"LC-MS/MS acetylation site mapping, site-directed mutagenesis, subcellular fractionation, ChIP","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1–2 — mass spectrometry acetylation mapping plus mutagenesis and functional localization/ChIP studies, single lab","pmids":["31700102"],"is_preprint":false},{"year":2021,"finding":"DVL-1 occupies genomic regions identified by ChIP-Seq and its peaks co-localize with the repressive epigenetic mark H3K27me3 and EZH2, establishing DVL-1 as a nuclear transcriptional regulator.","method":"ChIP-Seq, bioinformatics co-localization with H3K27me3 and EZH2 ChIP-Seq","journal":"Genes & cancer","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-Seq with epigenetic mark co-localization, single lab","pmids":["34659647"],"is_preprint":false},{"year":2022,"finding":"DVL1 (and DVL3) must be present in the nucleus to regulate proliferation in human myoblasts; DVL1 nuclear activity is independent of β-catenin nuclear translocation and does not require the DIX or PDZ domains (unlike DVL3), indicating domain-distinct nuclear mechanisms.","method":"siRNA knockdown, nuclear localization mutants, BrdU proliferation assay, β-catenin nuclear translocation assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — domain mutagenesis plus functional proliferation and localization assays, single lab","pmids":["35589804"],"is_preprint":false},{"year":2023,"finding":"DVL1 interacts with somatostatin receptor 2 (Sstr2) in a ligand-independent manner and targets Sstr2 for lysosomal (not proteasomal) degradation without affecting receptor internalization or recycling, but suppresses agonist-stimulated ERK1/2 activation; Wnt ligand overexpression potentiates this degradation.","method":"Co-immunoprecipitation, receptor internalization/recycling assays, lysosomal inhibitor assays, adenylyl cyclase signaling assay, ERK1/2 phosphorylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal biochemical assays defining a novel substrate and mechanistic outcome, single rigorous study","pmids":["36965619"],"is_preprint":false},{"year":2023,"finding":"DVL1 Robinow syndrome frameshift variants (expressed in Drosophila and chicken) cause loss of canonical and gain of non-canonical Wnt signaling; in Drosophila, variants induce JNK-dependent ectopic MMP1 expression, increased cell death in imaginal discs, and aberrant collagen IV deposition, without altering cell proliferation.","method":"Transgenic Drosophila and chicken expression of human DVL1 variants, TOPFlash and PCP reporter assays, immunostaining for MMP1/collagen IV, caspase inhibitor rescue","journal":"Disease models & mechanisms","confidence":"High","confidence_rationale":"Tier 2 — in vivo model organism functional assays with multiple readouts and epistasis (caspase inhibitor, JNK dependence)","pmids":["36916233"],"is_preprint":false},{"year":2024,"finding":"HECW1 (E3 ubiquitin ligase) promotes ubiquitination of DVL1, leading to its degradation and suppression of Wnt/β-catenin signaling; HECW1 inhibition reduces DVL1 ubiquitination, increases DVL1 levels, and promotes cervical cancer cell proliferation.","method":"Overexpression/knockdown, ubiquitination assay, co-immunoprecipitation, TOPFlash reporter, in vivo xenograft","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2–3 — ubiquitination assay plus reporter and in vivo validation, single lab","pmids":["38266865"],"is_preprint":false},{"year":2025,"finding":"DACT3 interacts with DVL1 (co-immunoprecipitation) and inhibits DVL1-induced GSK-3β phosphorylation at Ser9 and β-catenin phosphorylation at Ser675, reducing β-catenin nuclear translocation and transcriptional activity, thereby suppressing DVL1-driven NSCLC malignant phenotypes.","method":"Co-immunoprecipitation, TOPFlash luciferase assay, immunofluorescence, Western blot for GSK-3β and β-catenin phosphorylation, siRNA/cDNA transfection","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus multiple downstream pathway readouts with mutagenesis context, single lab","pmids":["40838391"],"is_preprint":false},{"year":2025,"finding":"DVL1 Robinow syndrome frameshift mutant proteins fail to redistribute from cytoplasmic puncta in response to WNT3A stimulation (unlike wild-type DVL1) and fail to activate canonical WNT signaling in TOPFlash assays; the mutant C-terminal tail interferes with CSNK1E-induced phosphorylation of DVL1.","method":"Immunocytochemistry of DVL1 puncta redistribution, TOPFlash reporter assay, CSNK1E phosphorylation assay, transfection of WT/frameshift/truncated constructs","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal assays (localization, reporter, phosphorylation) across all three DVL paralogs; preprint","pmids":["bio_10.1101_2025.08.02.668297"],"is_preprint":true},{"year":2026,"finding":"Nup358 interacts with DVL1 through its N-terminal domain and inhibits DVL1 spontaneous phase separation into biomolecular condensates; loss of Nup358 allows DVL1 condensate formation, which promotes Tankyrase-mediated Axin1 degradation, constitutive β-catenin stabilization, and ligand-independent Wnt activation that depletes intestinal transit-amplifying progenitors.","method":"Conditional Nup358 knockout in mice, co-immunoprecipitation of Nup358-DVL1, imaging of DVL1 condensates, Axin1 degradation assay, β-catenin stabilization assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo mouse KO with mechanistic Co-IP and condensate/signaling assays; preprint","pmids":["41929184"],"is_preprint":true}],"current_model":"DVL1 is a cytoplasmic scaffolding protein that transduces both canonical (β-catenin-dependent) and non-canonical/PCP Wnt signals downstream of Frizzled receptors: it is phosphorylated by CKIε to form an activating complex with Frat-1 that stabilizes β-catenin, interacts via its DIX domain with Axin1 to modulate the β-catenin destruction complex, and can form phase-separated condensates that drive ligand-independent Wnt activation; DVL1 also inhibits PCP signaling by hyperphosphorylating and preventing internalization of Frizzled3 (antagonized by Vangl2), undergoes acetylation at K69/K285 and ubiquitination (by HECW1) that control its nuclear translocation and stability respectively, accumulates in the nucleus at rDNA loci to repress RNA Pol I transcription in response to Wnt5a, and is subject to proteasomal degradation promoted by Neuroglobin; loss-of-function causes social behavior and sensorimotor gating deficits in mice, while dominant Robinow syndrome frameshift mutations generate a basic C-terminal tail that locks DVL1 in cytoplasmic puncta, impairs CKIε-dependent phosphorylation, and shifts signaling from canonical toward non-canonical Wnt."},"narrative":{"teleology":[{"year":1997,"claim":"Establishing that Dvl1 has a non-redundant in vivo role in complex behavior, Dvl1-knockout mice revealed deficits in social interaction and sensorimotor gating (prepulse inhibition) despite normal viability and fertility.","evidence":"Gene-targeted knockout mice with behavioral phenotyping","pmids":["9298901","14960015"],"confidence":"High","gaps":["Neuroanatomical and circuit-level mechanisms underlying the behavioral phenotype were undefined","Redundancy with Dvl2/Dvl3 in the CNS was not dissected"]},{"year":1999,"claim":"A yeast two-hybrid screen identified EPS8 as a PDZ-domain interactor of DVL1, suggesting DVL1 interfaces with receptor tyrosine kinase signaling beyond Wnt pathways.","evidence":"Yeast two-hybrid, in vitro binding, co-transfection phosphorylation assays","pmids":["10581192"],"confidence":"Medium","gaps":["No in vivo validation of DVL1–EPS8 interaction","Functional consequence for EGFR signaling in physiological contexts not tested"]},{"year":2003,"claim":"The mechanism by which DVL1 activates canonical Wnt signaling was resolved: CKIε phosphorylates DVL1 to enhance its binding to Frat-1 (via residues 228–250), and this complex cooperatively stabilizes β-catenin and activates TCF-4 transcription.","evidence":"Co-IP, deletion mutant mapping, TOPFlash reporter, RNAi knockdown of CKIε","pmids":["12556519"],"confidence":"High","gaps":["Structural basis of the CKIε–DVL1–Frat-1 ternary complex was not determined","Specific CKIε phosphorylation sites on DVL1 were not mapped"]},{"year":2010,"claim":"Biochemical reconstitution demonstrated that DVL1 and Axin1 interact directly through their DIX domains, providing a molecular basis for DVL1's recruitment to the β-catenin destruction complex.","evidence":"Co-expression of DIX domains, affinity chromatography, size-exclusion chromatography, crystallization","pmids":["20846493"],"confidence":"Medium","gaps":["High-resolution structure of the DVL1–Axin1 DIX complex was not solved","Stoichiometry and polymerization state in cells were not determined"]},{"year":2011,"claim":"DVL1's role in non-canonical PCP signaling was defined: DVL1 hyperphosphorylates Frizzled3 to prevent its internalization, thereby inhibiting PCP signal propagation, while Vangl2 antagonizes this effect to sharpen gradient sensing in commissural axon growth cones.","evidence":"In vivo axon guidance assays, overexpression/knockdown, Frizzled3 phosphorylation and internalization measurements","pmids":["21316586"],"confidence":"High","gaps":["Kinase responsible for DVL1-induced Frizzled3 phosphorylation was not identified","Whether this mechanism generalizes beyond commissural axons was not tested"]},{"year":2015,"claim":"The genetic basis of DVL1-associated Robinow syndrome was established: heterozygous frameshift mutations in exon 14 escape NMD and produce C-terminally altered proteins that cause autosomal-dominant osteosclerotic Robinow syndrome, with co-expression of mutant and wild-type alleles paradoxically enhancing canonical Wnt reporter activity.","evidence":"Whole-exome sequencing of multiple families, transcript validation in patient leukocytes, TOPFlash reporter assays with mutant constructs","pmids":["25817016","25817014"],"confidence":"High","gaps":["Precise molecular mechanism of the dominant interaction between mutant and wild-type DVL1 was not resolved","Tissue-specific consequences of the mutant allele were not tested in vivo"]},{"year":2016,"claim":"DVL1 was revealed to have a paralog-specific nuclear function: Wnt5a drives DVL1 accumulation at nucleolar organizer regions where it displaces SIRT7 from rDNA and disassembles the RNA Pol I transcription machinery, repressing ribosomal RNA transcription.","evidence":"Paralog-specific siRNA, ChIP at rDNA loci, immunofluorescence co-localization, Pol I transcription assay","pmids":["27500936"],"confidence":"High","gaps":["How Wnt5a signaling specifically directs DVL1 (not DVL2/3) to the nucleolus was unknown","Downstream physiological impact of rRNA repression was not addressed"]},{"year":2016,"claim":"Dvl1 loss-of-function in the gut was shown to disrupt both epithelial (Paneth cell) and immune (CD8+ T cell) homeostasis, with bone marrow chimera experiments demonstrating that both compartments contribute to gastrointestinal dysfunction.","evidence":"Dvl1−/− knockout mice, bone marrow chimera, histology, gut transit measurements","pmids":["27525310"],"confidence":"High","gaps":["Wnt pathway branch (canonical vs. non-canonical) mediating epithelial versus immune phenotypes was not resolved","Microbiota-dependent versus -independent contributions were incompletely dissected"]},{"year":2018,"claim":"Post-translational control of DVL1 stability was identified: Neuroglobin directly binds DVL1 and promotes its proteasomal degradation, thereby inhibiting both DVL1-mediated canonical Wnt and NF-κB signaling.","evidence":"Co-immunoprecipitation, co-localization, TOPFlash reporter, proteasome inhibitor rescue","pmids":["30041403"],"confidence":"Medium","gaps":["Whether Neuroglobin recruits a specific E3 ligase to DVL1 was not determined","Physiological context (cell type, stimulus) for Neuroglobin–DVL1 regulation was not established"]},{"year":2019,"claim":"Acetylation was identified as a key post-translational modification regulating DVL1 nuclear–cytoplasmic partitioning: mass spectrometry mapped 12 acetylated lysines, and site-directed mutagenesis showed that K69 (DIX) and K285 (PDZ) acetylation promotes nuclear accumulation and chromatin binding.","evidence":"LC-MS/MS, site-directed mutagenesis, subcellular fractionation, ChIP in triple-negative breast cancer cells","pmids":["31700102"],"confidence":"Medium","gaps":["Acetyltransferase(s) and deacetylase(s) responsible were not identified","Functional consequence for specific target gene expression was not determined"]},{"year":2021,"claim":"ChIP-Seq demonstrated that nuclear DVL1 occupies genomic regions co-marked with H3K27me3 and EZH2, linking DVL1 to Polycomb-mediated transcriptional repression.","evidence":"ChIP-Seq with bioinformatic co-localization analysis of DVL1, H3K27me3, and EZH2 peaks","pmids":["34659647"],"confidence":"Medium","gaps":["Direct physical interaction between DVL1 and PRC2 components was not shown","Causal role of DVL1 in establishing or maintaining H3K27me3 marks was not tested"]},{"year":2022,"claim":"Nuclear DVL1 was shown to regulate myoblast proliferation independently of β-catenin nuclear translocation and without requiring its DIX or PDZ domains, establishing a domain-distinct nuclear mechanism separable from canonical Wnt scaffolding.","evidence":"siRNA knockdown, nuclear localization mutants, BrdU proliferation assay in human myoblasts","pmids":["35589804"],"confidence":"Medium","gaps":["Nuclear binding partners mediating DVL1's proliferative effect were not identified","Whether this mechanism operates in vivo during myogenesis was untested"]},{"year":2023,"claim":"DVL1 was found to regulate a non-Wnt GPCR: it interacts with somatostatin receptor 2 (SSTR2) in a ligand-independent manner and targets it for lysosomal degradation, suppressing agonist-stimulated ERK1/2 activation.","evidence":"Co-IP, receptor internalization/recycling assays, lysosomal inhibitor rescue, ERK1/2 phosphorylation assay","pmids":["36965619"],"confidence":"High","gaps":["Domain of DVL1 responsible for SSTR2 interaction was not mapped","Whether other GPCRs are similarly regulated by DVL1 was not explored"]},{"year":2023,"claim":"In vivo functional studies of Robinow frameshift variants in Drosophila and chicken resolved the signaling shift: mutant DVL1 loses canonical Wnt output while gaining non-canonical Wnt/JNK signaling, leading to ectopic MMP1, apoptosis, and aberrant collagen IV deposition.","evidence":"Transgenic Drosophila and chicken embryo expression of human DVL1 variants, TOPFlash/PCP reporters, MMP1/collagen IV immunostaining, caspase inhibitor rescue","pmids":["36916233"],"confidence":"High","gaps":["Whether JNK hyperactivation is the primary driver of skeletal phenotypes in Robinow patients was not determined","Tissue-specific signaling balance in mammalian models was not assessed"]},{"year":2024,"claim":"The E3 ubiquitin ligase HECW1 was identified as a direct regulator of DVL1 turnover: HECW1 ubiquitinates DVL1 for degradation, and loss of HECW1 stabilizes DVL1, hyperactivating Wnt/β-catenin signaling and promoting cervical cancer cell proliferation.","evidence":"Ubiquitination assay, Co-IP, TOPFlash reporter, xenograft tumor model","pmids":["38266865"],"confidence":"Medium","gaps":["Specific ubiquitination sites on DVL1 targeted by HECW1 were not mapped","Relationship between HECW1 and Neuroglobin-mediated DVL1 degradation was not addressed"]},{"year":null,"claim":"Key unresolved questions include: the structural basis for how the Robinow frameshift C-terminal tail blocks CKIε phosphorylation and locks DVL1 in puncta; the identity of nuclear interaction partners that mediate DVL1's β-catenin-independent proliferative and Polycomb-associated functions; and whether DVL1 phase separation is regulated physiologically to tune Wnt signaling in specific tissues.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of full-length DVL1 or the Robinow mutant C-terminal tail","Nuclear DVL1 interactome is incomplete","In vivo significance of DVL1 condensate regulation (e.g., by Nup358) awaits peer-reviewed confirmation"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,4,14]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,14,17]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[7,12]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[7,9,12]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,4,10,14]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,9,11,12,13]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,4,6,14,15,16,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,5,6,15]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[7,9,12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,6,15]}],"complexes":["β-catenin destruction complex"],"partners":["FRAT1","AXIN1","CSNK1E","EPS8","SSTR2","HECW1","NGB","DACT3"],"other_free_text":[]},"mechanistic_narrative":"DVL1 is a cytoplasmic scaffolding protein that transduces Wnt signals downstream of Frizzled receptors through both canonical (β-catenin-dependent) and non-canonical/planar cell polarity (PCP) pathways, and additionally functions as a nuclear transcriptional regulator. In canonical Wnt signaling, CKIε phosphorylates DVL1 to promote its interaction with Frat-1 and cooperative activation of β-catenin/TCF transcription [PMID:12556519]; DVL1 also engages Axin1 through DIX–DIX domain interactions to modulate the β-catenin destruction complex [PMID:20846493], and its phase separation into biomolecular condensates can drive ligand-independent Wnt activation by promoting Tankyrase-mediated Axin1 degradation [PMID:41929184]. In the nucleus, DVL1 accumulates at rDNA loci in response to Wnt5a to repress RNA Pol I transcription [PMID:27500936], co-localizes with H3K27me3/EZH2-marked chromatin [PMID:34659647], and regulates myoblast proliferation through a β-catenin-independent mechanism [PMID:35589804]. Heterozygous frameshift mutations in exon 14 of DVL1 that generate a novel basic C-terminal tail cause autosomal-dominant Robinow syndrome by impairing CKIε-dependent phosphorylation and shifting signaling from canonical toward non-canonical Wnt/JNK output [PMID:25817016, PMID:36916233]."},"prefetch_data":{"uniprot":{"accession":"O14640","full_name":"Segment polarity protein dishevelled homolog DVL-1","aliases":["DSH homolog 1"],"length_aa":695,"mass_kda":75.2,"function":"Participates in Wnt signaling by binding to the cytoplasmic C-terminus of frizzled family members and transducing the Wnt signal to down-stream effectors. Plays a role both in canonical and non-canonical Wnt signaling. Plays a role in the signal transduction pathways mediated by multiple Wnt genes. Required for LEF1 activation upon WNT1 and WNT3A signaling. DVL1 and PAK1 form a ternary complex with MUSK which is important for MUSK-dependent regulation of AChR clustering during the formation of the neuromuscular junction (NMJ)","subcellular_location":"Cell membrane; Cytoplasm, cytosol; Cytoplasmic vesicle","url":"https://www.uniprot.org/uniprotkb/O14640/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DVL1","classification":"Not Classified","n_dependent_lines":71,"n_total_lines":1208,"dependency_fraction":0.058774834437086095},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DVL1","total_profiled":1310},"omim":[{"mim_id":"621363","title":"MAP7 DOMAIN-CONTAINING PROTEIN 1; MAP7D1","url":"https://www.omim.org/entry/621363"},{"mim_id":"617813","title":"TRANSMEMBRANE PROTEIN 88; TMEM88","url":"https://www.omim.org/entry/617813"},{"mim_id":"617485","title":"WD REPEAT- AND FYVE DOMAIN-CONTAINING PROTEIN 3; WDFY3","url":"https://www.omim.org/entry/617485"},{"mim_id":"616894","title":"ROBINOW SYNDROME, AUTOSOMAL DOMINANT 3; DRS3","url":"https://www.omim.org/entry/616894"},{"mim_id":"616331","title":"ROBINOW SYNDROME, AUTOSOMAL DOMINANT 2; DRS2","url":"https://www.omim.org/entry/616331"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"},{"location":"Focal adhesion sites","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":215.3}],"url":"https://www.proteinatlas.org/search/DVL1"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O14640","domains":[{"cath_id":"2.40.240.130","chopping":"5-84","consensus_level":"high","plddt":89.2424,"start":5,"end":84},{"cath_id":"2.30.42.10","chopping":"250-337","consensus_level":"high","plddt":85.4131,"start":250,"end":337},{"cath_id":"1.10.10.10","chopping":"416-507","consensus_level":"high","plddt":87.0833,"start":416,"end":507}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14640","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14640-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14640-F1-predicted_aligned_error_v6.png","plddt_mean":59.84},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DVL1","jax_strain_url":"https://www.jax.org/strain/search?query=DVL1"},"sequence":{"accession":"O14640","fasta_url":"https://rest.uniprot.org/uniprotkb/O14640.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14640/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14640"}},"corpus_meta":[{"pmid":"9298901","id":"PMC_9298901","title":"Social interaction and sensorimotor gating abnormalities in mice lacking Dvl1.","date":"1997","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/9298901","citation_count":378,"is_preprint":false},{"pmid":"21316586","id":"PMC_21316586","title":"Vangl2 promotes Wnt/planar cell polarity-like signaling by antagonizing Dvl1-mediated feedback inhibition in growth cone guidance.","date":"2011","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/21316586","citation_count":163,"is_preprint":false},{"pmid":"25817016","id":"PMC_25817016","title":"DVL1 frameshift mutations clustering in the penultimate exon cause autosomal-dominant Robinow syndrome.","date":"2015","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25817016","citation_count":108,"is_preprint":false},{"pmid":"12824876","id":"PMC_12824876","title":"Amplification, up-regulation and over-expression of DVL-1, the human counterpart of the Drosophila disheveled gene, in primary breast cancers.","date":"2003","source":"Cancer science","url":"https://pubmed.ncbi.nlm.nih.gov/12824876","citation_count":105,"is_preprint":false},{"pmid":"12556519","id":"PMC_12556519","title":"Casein kinase I epsilon enhances the binding of Dvl-1 to Frat-1 and is essential for Wnt-3a-induced accumulation of beta-catenin.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12556519","citation_count":96,"is_preprint":false},{"pmid":"14960015","id":"PMC_14960015","title":"Expanded characterization of the social interaction abnormalities in mice lacking Dvl1.","date":"2004","source":"Genes, brain, and behavior","url":"https://pubmed.ncbi.nlm.nih.gov/14960015","citation_count":78,"is_preprint":false},{"pmid":"25817014","id":"PMC_25817014","title":"Mutations in DVL1 cause an osteosclerotic form of Robinow syndrome.","date":"2015","source":"American journal of human 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trimming, nest-building, huddling, social dominance) and sensorimotor gating (prepulse inhibition), establishing Dvl1's role in complex social and sensorimotor behaviors in vivo.\",\n      \"method\": \"Gene targeting knockout mouse, behavioral testing\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific behavioral phenotypic readouts, replicated across institutions\",\n      \"pmids\": [\"9298901\", \"14960015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CKIε phosphorylates Dvl-1 and enhances its binding to Frat-1 via the amino acid region 228–250 of Dvl-1; this Dvl-1/Frat-1 complex cooperatively activates β-catenin accumulation and TCF-4 transcriptional activity. CKIε knockdown blocks Wnt-3a-induced Dvl phosphorylation, Dvl-1/Frat-1 binding, and β-catenin accumulation.\",\n      \"method\": \"Co-immunoprecipitation, deletion mutant analysis, TOPFlash/TCF luciferase reporter assay, RNAi knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, mutagenesis, reporter assay, RNAi) in single rigorous study\",\n      \"pmids\": [\"12556519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DVL1 inhibits PCP signaling by inducing hyperphosphorylation of Frizzled3 and preventing its internalization; Vangl2 antagonizes this by reducing Frizzled3 phosphorylation and promoting internalization, thereby sharpening PCP gradient sensing in commissural axon growth cones.\",\n      \"method\": \"In vivo axon guidance assays, overexpression/knockdown, phosphorylation assays, localization studies in growth cones\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with functional phenotypic readout and mechanistic follow-up\",\n      \"pmids\": [\"21316586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"DVL1 interacts with EPS8 (an EGFR substrate) through its PDZ domain; this interaction leads to DVL1 hyperphosphorylation and inhibition of EGFR-stimulated tyrosine phosphorylation of EPS8, linking DVL1 to receptor tyrosine kinase signaling.\",\n      \"method\": \"Yeast two-hybrid screening, in vitro binding assay, co-transfection/phosphorylation assay, immunohistochemistry\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — yeast two-hybrid plus in vitro binding and phosphorylation assay, single lab\",\n      \"pmids\": [\"10581192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The DIX domain of DVL1 forms a protein complex with the DIX domain of Axin1; co-expression stabilizes both otherwise unstable DIX fragments and the complex was confirmed by affinity chromatography and size-exclusion chromatography with preliminary crystallization.\",\n      \"method\": \"Co-expression in multi-cistronic system, affinity chromatography, SEC, crystallization\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — biochemical reconstitution and complex formation confirmed by multiple methods, single lab\",\n      \"pmids\": [\"20846493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Heterozygous DVL1 frameshift mutations in exon 14 (penultimate exon) escape nonsense-mediated decay and generate a C-terminally truncated protein that causes autosomal-dominant Robinow syndrome; mutant allele expression confirmed in patient leukocytes.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing, transcript analysis from patient leukocytes\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple families, transcript-level validation, de novo variant confirmation\",\n      \"pmids\": [\"25817016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"De novo DVL1 frameshift mutations that delete the C-terminus and replace it with a novel basic sequence cause the osteosclerotic Robinow syndrome subtype (RS-OS); in vitro TOPFlash assays show the mutant allele alone is less active than wild-type, but co-expression of mutant and wild-type alleles increases canonical Wnt activity ~2-fold, suggesting a dominant gain-of-function interaction.\",\n      \"method\": \"Whole-exome sequencing, GFP-tagged construct transfection, protein stability assay, TOPFlash canonical Wnt reporter assay\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — functional in vitro reporter assays with mutagenesis plus patient genetics, single lab\",\n      \"pmids\": [\"25817014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Wnt5a signals specifically through DVL1 (not other DVL paralogs) to accumulate DVL1 in nucleolar organizer regions (NORs), where DVL1 binds rDNA loci; upon DVL1 binding, SIRT7 releases from rDNA and the RNA Pol I transcription machinery disassembles, repressing ribosomal DNA transcription.\",\n      \"method\": \"siRNA knockdown of individual DVLs, chromatin immunoprecipitation (ChIP) for rDNA, co-localization by immunofluorescence, Pol I transcription assay\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ChIP, co-localization, functional transcription assay, paralog-specific knockdown)\",\n      \"pmids\": [\"27500936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Dvl1 loss-of-function (knockout) in mice causes Paneth cell reduction and mislocalization, increased CD8+ T cells in the lamina propria, and prolonged gut transit time; bone marrow chimera experiments showed both epithelial and immune cell abnormalities are required for GI dysfunction, placing Dvl1 in dual epithelial and immune regulation of intestinal homeostasis.\",\n      \"method\": \"Dvl1-/- knockout mice, bone marrow chimera, gut microbiota manipulation, histology\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with bone marrow chimera epistasis and multiple cellular phenotype readouts\",\n      \"pmids\": [\"27525310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DVL-1 enters the nucleus and localizes to at least two CYP19A1 (aromatase) promoters (pII and I.4); DVL-1 loss-of-function leads to differential changes in aromatase transcript levels and estrogen production in breast cancer cells.\",\n      \"method\": \"ChIP at CYP19A1 promoters, siRNA knockdown, RT-PCR, estrogen production assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus functional knockdown with transcript and hormone readouts, single lab\",\n      \"pmids\": [\"30479694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Neuroglobin directly interacts with DVL1 (confirmed by co-immunoprecipitation), colocalizes with it in cytoplasm and nucleus, and promotes proteasomal degradation of DVL1, thereby inhibiting DVL1-mediated β-catenin/Wnt and DVL1-mediated suppression of NFκB signaling.\",\n      \"method\": \"Co-immunoprecipitation, co-localization by immunofluorescence, TOPFlash reporter assay, proteasome inhibitor treatment\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus reporter assay and proteasomal degradation assay, single lab\",\n      \"pmids\": [\"30041403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DVL-1 is acetylated at 12 lysine residues; acetylation of K69 (DIX domain) and K285 (PDZ domain) promotes nuclear over cytoplasmic localization of DVL-1 and influences its binding to gene promoters in triple-negative breast cancer cells.\",\n      \"method\": \"LC-MS/MS acetylation site mapping, site-directed mutagenesis, subcellular fractionation, ChIP\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — mass spectrometry acetylation mapping plus mutagenesis and functional localization/ChIP studies, single lab\",\n      \"pmids\": [\"31700102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DVL-1 occupies genomic regions identified by ChIP-Seq and its peaks co-localize with the repressive epigenetic mark H3K27me3 and EZH2, establishing DVL-1 as a nuclear transcriptional regulator.\",\n      \"method\": \"ChIP-Seq, bioinformatics co-localization with H3K27me3 and EZH2 ChIP-Seq\",\n      \"journal\": \"Genes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-Seq with epigenetic mark co-localization, single lab\",\n      \"pmids\": [\"34659647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DVL1 (and DVL3) must be present in the nucleus to regulate proliferation in human myoblasts; DVL1 nuclear activity is independent of β-catenin nuclear translocation and does not require the DIX or PDZ domains (unlike DVL3), indicating domain-distinct nuclear mechanisms.\",\n      \"method\": \"siRNA knockdown, nuclear localization mutants, BrdU proliferation assay, β-catenin nuclear translocation assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain mutagenesis plus functional proliferation and localization assays, single lab\",\n      \"pmids\": [\"35589804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DVL1 interacts with somatostatin receptor 2 (Sstr2) in a ligand-independent manner and targets Sstr2 for lysosomal (not proteasomal) degradation without affecting receptor internalization or recycling, but suppresses agonist-stimulated ERK1/2 activation; Wnt ligand overexpression potentiates this degradation.\",\n      \"method\": \"Co-immunoprecipitation, receptor internalization/recycling assays, lysosomal inhibitor assays, adenylyl cyclase signaling assay, ERK1/2 phosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical assays defining a novel substrate and mechanistic outcome, single rigorous study\",\n      \"pmids\": [\"36965619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DVL1 Robinow syndrome frameshift variants (expressed in Drosophila and chicken) cause loss of canonical and gain of non-canonical Wnt signaling; in Drosophila, variants induce JNK-dependent ectopic MMP1 expression, increased cell death in imaginal discs, and aberrant collagen IV deposition, without altering cell proliferation.\",\n      \"method\": \"Transgenic Drosophila and chicken expression of human DVL1 variants, TOPFlash and PCP reporter assays, immunostaining for MMP1/collagen IV, caspase inhibitor rescue\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo model organism functional assays with multiple readouts and epistasis (caspase inhibitor, JNK dependence)\",\n      \"pmids\": [\"36916233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HECW1 (E3 ubiquitin ligase) promotes ubiquitination of DVL1, leading to its degradation and suppression of Wnt/β-catenin signaling; HECW1 inhibition reduces DVL1 ubiquitination, increases DVL1 levels, and promotes cervical cancer cell proliferation.\",\n      \"method\": \"Overexpression/knockdown, ubiquitination assay, co-immunoprecipitation, TOPFlash reporter, in vivo xenograft\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — ubiquitination assay plus reporter and in vivo validation, single lab\",\n      \"pmids\": [\"38266865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DACT3 interacts with DVL1 (co-immunoprecipitation) and inhibits DVL1-induced GSK-3β phosphorylation at Ser9 and β-catenin phosphorylation at Ser675, reducing β-catenin nuclear translocation and transcriptional activity, thereby suppressing DVL1-driven NSCLC malignant phenotypes.\",\n      \"method\": \"Co-immunoprecipitation, TOPFlash luciferase assay, immunofluorescence, Western blot for GSK-3β and β-catenin phosphorylation, siRNA/cDNA transfection\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus multiple downstream pathway readouts with mutagenesis context, single lab\",\n      \"pmids\": [\"40838391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DVL1 Robinow syndrome frameshift mutant proteins fail to redistribute from cytoplasmic puncta in response to WNT3A stimulation (unlike wild-type DVL1) and fail to activate canonical WNT signaling in TOPFlash assays; the mutant C-terminal tail interferes with CSNK1E-induced phosphorylation of DVL1.\",\n      \"method\": \"Immunocytochemistry of DVL1 puncta redistribution, TOPFlash reporter assay, CSNK1E phosphorylation assay, transfection of WT/frameshift/truncated constructs\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal assays (localization, reporter, phosphorylation) across all three DVL paralogs; preprint\",\n      \"pmids\": [\"bio_10.1101_2025.08.02.668297\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Nup358 interacts with DVL1 through its N-terminal domain and inhibits DVL1 spontaneous phase separation into biomolecular condensates; loss of Nup358 allows DVL1 condensate formation, which promotes Tankyrase-mediated Axin1 degradation, constitutive β-catenin stabilization, and ligand-independent Wnt activation that depletes intestinal transit-amplifying progenitors.\",\n      \"method\": \"Conditional Nup358 knockout in mice, co-immunoprecipitation of Nup358-DVL1, imaging of DVL1 condensates, Axin1 degradation assay, β-catenin stabilization assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse KO with mechanistic Co-IP and condensate/signaling assays; preprint\",\n      \"pmids\": [\"41929184\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DVL1 is a cytoplasmic scaffolding protein that transduces both canonical (β-catenin-dependent) and non-canonical/PCP Wnt signals downstream of Frizzled receptors: it is phosphorylated by CKIε to form an activating complex with Frat-1 that stabilizes β-catenin, interacts via its DIX domain with Axin1 to modulate the β-catenin destruction complex, and can form phase-separated condensates that drive ligand-independent Wnt activation; DVL1 also inhibits PCP signaling by hyperphosphorylating and preventing internalization of Frizzled3 (antagonized by Vangl2), undergoes acetylation at K69/K285 and ubiquitination (by HECW1) that control its nuclear translocation and stability respectively, accumulates in the nucleus at rDNA loci to repress RNA Pol I transcription in response to Wnt5a, and is subject to proteasomal degradation promoted by Neuroglobin; loss-of-function causes social behavior and sensorimotor gating deficits in mice, while dominant Robinow syndrome frameshift mutations generate a basic C-terminal tail that locks DVL1 in cytoplasmic puncta, impairs CKIε-dependent phosphorylation, and shifts signaling from canonical toward non-canonical Wnt.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DVL1 is a cytoplasmic scaffolding protein that transduces Wnt signals downstream of Frizzled receptors through both canonical (β-catenin-dependent) and non-canonical/planar cell polarity (PCP) pathways, and additionally functions as a nuclear transcriptional regulator. In canonical Wnt signaling, CKIε phosphorylates DVL1 to promote its interaction with Frat-1 and cooperative activation of β-catenin/TCF transcription [PMID:12556519]; DVL1 also engages Axin1 through DIX–DIX domain interactions to modulate the β-catenin destruction complex [PMID:20846493], and its phase separation into biomolecular condensates can drive ligand-independent Wnt activation by promoting Tankyrase-mediated Axin1 degradation [PMID:41929184]. In the nucleus, DVL1 accumulates at rDNA loci in response to Wnt5a to repress RNA Pol I transcription [PMID:27500936], co-localizes with H3K27me3/EZH2-marked chromatin [PMID:34659647], and regulates myoblast proliferation through a β-catenin-independent mechanism [PMID:35589804]. Heterozygous frameshift mutations in exon 14 of DVL1 that generate a novel basic C-terminal tail cause autosomal-dominant Robinow syndrome by impairing CKIε-dependent phosphorylation and shifting signaling from canonical toward non-canonical Wnt/JNK output [PMID:25817016, PMID:36916233].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing that Dvl1 has a non-redundant in vivo role in complex behavior, Dvl1-knockout mice revealed deficits in social interaction and sensorimotor gating (prepulse inhibition) despite normal viability and fertility.\",\n      \"evidence\": \"Gene-targeted knockout mice with behavioral phenotyping\",\n      \"pmids\": [\"9298901\", \"14960015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neuroanatomical and circuit-level mechanisms underlying the behavioral phenotype were undefined\", \"Redundancy with Dvl2/Dvl3 in the CNS was not dissected\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"A yeast two-hybrid screen identified EPS8 as a PDZ-domain interactor of DVL1, suggesting DVL1 interfaces with receptor tyrosine kinase signaling beyond Wnt pathways.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding, co-transfection phosphorylation assays\",\n      \"pmids\": [\"10581192\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vivo validation of DVL1–EPS8 interaction\", \"Functional consequence for EGFR signaling in physiological contexts not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"The mechanism by which DVL1 activates canonical Wnt signaling was resolved: CKIε phosphorylates DVL1 to enhance its binding to Frat-1 (via residues 228–250), and this complex cooperatively stabilizes β-catenin and activates TCF-4 transcription.\",\n      \"evidence\": \"Co-IP, deletion mutant mapping, TOPFlash reporter, RNAi knockdown of CKIε\",\n      \"pmids\": [\"12556519\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the CKIε–DVL1–Frat-1 ternary complex was not determined\", \"Specific CKIε phosphorylation sites on DVL1 were not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Biochemical reconstitution demonstrated that DVL1 and Axin1 interact directly through their DIX domains, providing a molecular basis for DVL1's recruitment to the β-catenin destruction complex.\",\n      \"evidence\": \"Co-expression of DIX domains, affinity chromatography, size-exclusion chromatography, crystallization\",\n      \"pmids\": [\"20846493\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"High-resolution structure of the DVL1–Axin1 DIX complex was not solved\", \"Stoichiometry and polymerization state in cells were not determined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"DVL1's role in non-canonical PCP signaling was defined: DVL1 hyperphosphorylates Frizzled3 to prevent its internalization, thereby inhibiting PCP signal propagation, while Vangl2 antagonizes this effect to sharpen gradient sensing in commissural axon growth cones.\",\n      \"evidence\": \"In vivo axon guidance assays, overexpression/knockdown, Frizzled3 phosphorylation and internalization measurements\",\n      \"pmids\": [\"21316586\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for DVL1-induced Frizzled3 phosphorylation was not identified\", \"Whether this mechanism generalizes beyond commissural axons was not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The genetic basis of DVL1-associated Robinow syndrome was established: heterozygous frameshift mutations in exon 14 escape NMD and produce C-terminally altered proteins that cause autosomal-dominant osteosclerotic Robinow syndrome, with co-expression of mutant and wild-type alleles paradoxically enhancing canonical Wnt reporter activity.\",\n      \"evidence\": \"Whole-exome sequencing of multiple families, transcript validation in patient leukocytes, TOPFlash reporter assays with mutant constructs\",\n      \"pmids\": [\"25817016\", \"25817014\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise molecular mechanism of the dominant interaction between mutant and wild-type DVL1 was not resolved\", \"Tissue-specific consequences of the mutant allele were not tested in vivo\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"DVL1 was revealed to have a paralog-specific nuclear function: Wnt5a drives DVL1 accumulation at nucleolar organizer regions where it displaces SIRT7 from rDNA and disassembles the RNA Pol I transcription machinery, repressing ribosomal RNA transcription.\",\n      \"evidence\": \"Paralog-specific siRNA, ChIP at rDNA loci, immunofluorescence co-localization, Pol I transcription assay\",\n      \"pmids\": [\"27500936\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Wnt5a signaling specifically directs DVL1 (not DVL2/3) to the nucleolus was unknown\", \"Downstream physiological impact of rRNA repression was not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Dvl1 loss-of-function in the gut was shown to disrupt both epithelial (Paneth cell) and immune (CD8+ T cell) homeostasis, with bone marrow chimera experiments demonstrating that both compartments contribute to gastrointestinal dysfunction.\",\n      \"evidence\": \"Dvl1−/− knockout mice, bone marrow chimera, histology, gut transit measurements\",\n      \"pmids\": [\"27525310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Wnt pathway branch (canonical vs. non-canonical) mediating epithelial versus immune phenotypes was not resolved\", \"Microbiota-dependent versus -independent contributions were incompletely dissected\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Post-translational control of DVL1 stability was identified: Neuroglobin directly binds DVL1 and promotes its proteasomal degradation, thereby inhibiting both DVL1-mediated canonical Wnt and NF-κB signaling.\",\n      \"evidence\": \"Co-immunoprecipitation, co-localization, TOPFlash reporter, proteasome inhibitor rescue\",\n      \"pmids\": [\"30041403\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Neuroglobin recruits a specific E3 ligase to DVL1 was not determined\", \"Physiological context (cell type, stimulus) for Neuroglobin–DVL1 regulation was not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Acetylation was identified as a key post-translational modification regulating DVL1 nuclear–cytoplasmic partitioning: mass spectrometry mapped 12 acetylated lysines, and site-directed mutagenesis showed that K69 (DIX) and K285 (PDZ) acetylation promotes nuclear accumulation and chromatin binding.\",\n      \"evidence\": \"LC-MS/MS, site-directed mutagenesis, subcellular fractionation, ChIP in triple-negative breast cancer cells\",\n      \"pmids\": [\"31700102\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Acetyltransferase(s) and deacetylase(s) responsible were not identified\", \"Functional consequence for specific target gene expression was not determined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"ChIP-Seq demonstrated that nuclear DVL1 occupies genomic regions co-marked with H3K27me3 and EZH2, linking DVL1 to Polycomb-mediated transcriptional repression.\",\n      \"evidence\": \"ChIP-Seq with bioinformatic co-localization analysis of DVL1, H3K27me3, and EZH2 peaks\",\n      \"pmids\": [\"34659647\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between DVL1 and PRC2 components was not shown\", \"Causal role of DVL1 in establishing or maintaining H3K27me3 marks was not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Nuclear DVL1 was shown to regulate myoblast proliferation independently of β-catenin nuclear translocation and without requiring its DIX or PDZ domains, establishing a domain-distinct nuclear mechanism separable from canonical Wnt scaffolding.\",\n      \"evidence\": \"siRNA knockdown, nuclear localization mutants, BrdU proliferation assay in human myoblasts\",\n      \"pmids\": [\"35589804\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear binding partners mediating DVL1's proliferative effect were not identified\", \"Whether this mechanism operates in vivo during myogenesis was untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"DVL1 was found to regulate a non-Wnt GPCR: it interacts with somatostatin receptor 2 (SSTR2) in a ligand-independent manner and targets it for lysosomal degradation, suppressing agonist-stimulated ERK1/2 activation.\",\n      \"evidence\": \"Co-IP, receptor internalization/recycling assays, lysosomal inhibitor rescue, ERK1/2 phosphorylation assay\",\n      \"pmids\": [\"36965619\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain of DVL1 responsible for SSTR2 interaction was not mapped\", \"Whether other GPCRs are similarly regulated by DVL1 was not explored\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"In vivo functional studies of Robinow frameshift variants in Drosophila and chicken resolved the signaling shift: mutant DVL1 loses canonical Wnt output while gaining non-canonical Wnt/JNK signaling, leading to ectopic MMP1, apoptosis, and aberrant collagen IV deposition.\",\n      \"evidence\": \"Transgenic Drosophila and chicken embryo expression of human DVL1 variants, TOPFlash/PCP reporters, MMP1/collagen IV immunostaining, caspase inhibitor rescue\",\n      \"pmids\": [\"36916233\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether JNK hyperactivation is the primary driver of skeletal phenotypes in Robinow patients was not determined\", \"Tissue-specific signaling balance in mammalian models was not assessed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The E3 ubiquitin ligase HECW1 was identified as a direct regulator of DVL1 turnover: HECW1 ubiquitinates DVL1 for degradation, and loss of HECW1 stabilizes DVL1, hyperactivating Wnt/β-catenin signaling and promoting cervical cancer cell proliferation.\",\n      \"evidence\": \"Ubiquitination assay, Co-IP, TOPFlash reporter, xenograft tumor model\",\n      \"pmids\": [\"38266865\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific ubiquitination sites on DVL1 targeted by HECW1 were not mapped\", \"Relationship between HECW1 and Neuroglobin-mediated DVL1 degradation was not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis for how the Robinow frameshift C-terminal tail blocks CKIε phosphorylation and locks DVL1 in puncta; the identity of nuclear interaction partners that mediate DVL1's β-catenin-independent proliferative and Polycomb-associated functions; and whether DVL1 phase separation is regulated physiologically to tune Wnt signaling in specific tissues.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of full-length DVL1 or the Robinow mutant C-terminal tail\", \"Nuclear DVL1 interactome is incomplete\", \"In vivo significance of DVL1 condensate regulation (e.g., by Nup358) awaits peer-reviewed confirmation\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 4, 14]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 14, 17]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [7, 12]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [7, 9, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 4, 10, 14]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 9, 11, 12, 13]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 4, 6, 14, 15, 16, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 5, 6, 15]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [7, 9, 12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 6, 15]}\n    ],\n    \"complexes\": [\n      \"β-catenin destruction complex\"\n    ],\n    \"partners\": [\n      \"FRAT1\",\n      \"AXIN1\",\n      \"CSNK1E\",\n      \"EPS8\",\n      \"SSTR2\",\n      \"HECW1\",\n      \"NGB\",\n      \"DACT3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}