{"gene":"WLS","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2006,"finding":"Wntless (Wls/Evi) is a conserved multipass transmembrane protein required in Wnt-producing cells for secretion of Wingless/Wnt ligands. RNAi depletion of Evi in Drosophila phenocopies wg loss-of-function, and Wg is retained intracellularly in evi mutant cells. Epistasis and clonal analysis place Evi in the Wg-producing cell, establishing it as the founding member of a gene family specifically required for Wg/Wnt secretion.","method":"RNAi screen, genetic epistasis, clonal analysis, immunofluorescence in Drosophila","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — epistasis + clonal analysis + loss-of-function phenotype; independently replicated in same year by Bänziger et al.","pmids":["16678096"],"is_preprint":false},{"year":2006,"finding":"Wntless (Wls) is required in Wnt-sending cells to promote secretion of Wnt proteins. Loss of Wls blocks Wingless-dependent patterning in Drosophila, MOM-2-governed polarization in C. elegans, and Wnt3a-mediated signaling in cultured human cells, indicating an ancient, dedicated partnership between Wls and all Wnt ligands analyzed.","method":"Genetic loss-of-function in Drosophila and C. elegans, siRNA knockdown in human cells, reporter assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multi-organism genetic epistasis, replicated across three systems; independent simultaneous replication by Bartscherer et al.","pmids":["16678095"],"is_preprint":false},{"year":2007,"finding":"The retromer complex is required for Wnt secretion by recycling Wntless (Wls) from endosomes back to the trans-Golgi network (TGN). The retromer subunit Vps35 co-localizes with and co-immunoprecipitates Wls in endosomes; Wls becomes unstable in the absence of retromer activity, depleting the pool available for Wnt secretion.","method":"Co-immunoprecipitation, co-localization imaging, genetic loss-of-function (Drosophila and mammalian cells), protein stability assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, epistasis, direct localization with functional consequence; replicated in same issue by Pan et al.","pmids":["18160348"],"is_preprint":false},{"year":2007,"finding":"In C. elegans, the mu subunit of clathrin adaptor AP-2 (DPY-23) acts in Wnt-expressing cells to regulate Wnt function through control of MIG-14/Wntless trafficking. In dpy-23 mutants, MIG-14 accumulates at or near the plasma membrane, whereas in retromer mutants MIG-14 accumulates in intracellular compartments, indicating that AP-2-mediated endocytosis and retromer-mediated recycling together control the intracellular itinerary of MIG-14/Wntless.","method":"C. elegans genetics, epistasis, fluorescence localization of MIG-14 in loss-of-function mutants","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in vivo with direct localization readout; convergent with Belenkaya et al. findings","pmids":["18160346"],"is_preprint":false},{"year":2009,"finding":"At the Drosophila neuromuscular junction, Wnt/Wingless is transmitted trans-synaptically via exosome-like vesicles containing Evi/Wls. Presynaptic vesicular release of Evi is required for Wingless secretion. Additionally, Evi acts cell-autonomously in the postsynaptic (Wnt-receiving) cell to target dGRIP to postsynaptic sites; loss of Evi in the postsynaptic cell mislocalizes dGRIP and impairs Wnt signal transduction.","method":"Live imaging, immunoelectron microscopy, genetic loss-of-function, cell-autonomous rescue experiments at Drosophila NMJ","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — direct vesicle imaging by EM, genetic epistasis, cell-autonomous rescue; strong evidence for dual pre- and postsynaptic Evi function","pmids":["19837038"],"is_preprint":false},{"year":2010,"finding":"WLS is ER-resident in human cells and WNT3A binding to WLS requires PORCN-dependent lipid modification (palmitoylation) of WNT3A at serine 209. Inhibition of vacuolar acidification blocks release of WNT3A from WLS, causing accumulation of the WNT3A-WLS complex at the plasma membrane, suggesting that low endosomal/vesicular pH is required to dissociate palmitoylated WNT3A from WLS during secretion. Modeling predicts WLS contains a lipocalin-family lipid-binding β-barrel domain.","method":"Pharmacological inhibition of V-ATPase, WNT3A Ser209 mutagenesis, co-immunoprecipitation, subcellular fractionation, Xenopus convergent-extension assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — mutagenesis of critical residue, co-IP, in vivo functional assay, multiple orthogonal approaches in one study","pmids":["20826466"],"is_preprint":false},{"year":2011,"finding":"Porcupine-mediated lipidation of a conserved serine residue (equivalent to Wg Ser239) is essential for all Drosophila Wnt family members (except WntD, which lacks this residue) to interact with and be secreted by Wls. WntD neither requires Porcupine nor Wls for secretion. Glycosylation status of Wg does not determine Wls-dependence.","method":"Systematic Drosophila genetics, Wnt secretion assays, site-directed mutagenesis of conserved serine, co-immunoprecipitation","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis of critical residue + co-IP + systematic genetic analysis across all Drosophila Wnts","pmids":["22108505"],"is_preprint":false},{"year":2012,"finding":"Release of Evi/Wls-containing exosomes at the Drosophila NMJ requires Rab11, its effector Myosin5, and Syntaxin 1A (Syx1A). These proteins were identified by dsRNA screen in cultured cells and validated in vivo in motoneurons. Ultrastructural analysis revealed multivesicular bodies containing Evi at synaptic boutons. Mass spectrometry and biochemical characterization confirmed that secreted Evi vesicles are bona fide exosomes.","method":"dsRNA screen, in vivo motoneuron genetic manipulation, electron microscopy, mass spectrometry, biochemical fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — screen + in vivo validation + EM ultrastructure + mass spectrometry; multiple orthogonal methods","pmids":["22437826"],"is_preprint":false},{"year":2012,"finding":"Wntless (WLS) and Porcupine (PORCN) are essential for all 19 human Wnt ligands to signal through both β-catenin-dependent and independent pathways, establishing WLS as a universal Wnt secretion factor. Wnts show considerable variation in stability, processing, and secretion levels despite similar mRNA expression.","method":"Comprehensive Gateway library of all 19 human Wnts, siRNA knockdown of WLS/PORCN, β-catenin reporter assays, LRP6 phosphorylation assays","journal":"Differentiation; research in biological diversity","confidence":"High","confidence_rationale":"Tier 2 — systematic functional analysis of all 19 Wnts with WLS knockdown, multiple signaling readouts","pmids":["22784633"],"is_preprint":false},{"year":2012,"finding":"Conditional deletion of Wls in limb mesenchyme prevents differentiation of distal mesenchyme and arrests limb outgrowth (likely by affecting Wnt5a function), while ectodermal Wls deletion causes agenesis of distal limb tissue, loss of tendon/ligament induction, impaired myoblast migration, and absence of dermis formation, demonstrating that WLS-dependent Wnt secretion from two distinct tissue compartments controls distinct aspects of limb patterning.","method":"Conditional Wls knockout (Cre-lox) in limb mesenchyme and ectoderm, histology, marker analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific conditional KO with defined phenotypic readouts","pmids":["22377357"],"is_preprint":false},{"year":2012,"finding":"Conditional deletion of Wls in the epidermis (K14-Cre) causes hair loss after the first cycle, impaired skin barrier function, psoriasis-like inflammation, depletion of dendritic epidermal T cells, and infiltration of γδ-low T cells, demonstrating that epidermal Wnt secretion via Wls is essential for normal skin homeostasis and immune cell homeostasis.","method":"Conditional Wls knockout, histology, flow cytometry, expression profiling, comparison to human psoriasis biopsies","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined immune and structural phenotypes","pmids":["23918954"],"is_preprint":false},{"year":2012,"finding":"Wls is expressed in the epidermis during embryonic hair follicle induction, and conditional K14-Cre deletion of Wls causes abnormal hair follicle development associated with impaired canonical Wnt/β-catenin signaling. Wnt5a expressed in embryonic epidermis is dispensable for this process, indicating that Wls-dependent canonical Wnt ligands mediate follicle induction.","method":"Conditional Wls knockout, immunofluorescence, β-catenin reporter analysis, comparison with Wnt5a null mice","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with mechanistic inference, but single lab, single tissue system","pmids":["23029304"],"is_preprint":false},{"year":2013,"finding":"Colorectal tumor cells express elevated levels of Wnt3 and Evi/Wls/GPR177, and even in the presence of APC or β-catenin mutations, downstream Wnt/β-catenin signaling remains dependent on Wnt ligand secretion via Evi/Wls. Truncated APC proteins bind β-catenin and destruction complex components, and Evi/Wls knockdown reduces β-catenin signaling in colon cancer cells.","method":"siRNA knockdown of Evi/Wls, β-catenin reporter assays, co-immunoprecipitation of APC with destruction complex, tumor expression analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — functional KD with signaling readout + co-IP; multiple colon cancer cell lines tested","pmids":["24162018"],"is_preprint":false},{"year":2016,"finding":"In zebrafish palate morphogenesis, Wls and its ligands Wnt9a and Wnt5b are expressed in the ectoderm, while juxtaposed chondrocytes express Frzb and Gpc4. Genetic analysis using wls, gpc4, frzb, wnt9a, and wnt5b mutants demonstrates that non-canonical Wnt signaling through Wls is required for cell intercalation during convergent-extension, with Wnt5b and Wnt9a controlling extension in distinct axes.","method":"Zebrafish mutant analysis, genetic epistasis, in situ hybridization, live imaging of cell intercalation","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — multi-mutant genetic epistasis in vivo; single organism/system","pmids":["27287801"],"is_preprint":false},{"year":2016,"finding":"In zebrafish craniofacial development, disruption of wls causes significant loss of craniofacial bone, whereas loss of gpc4, wnt5b, or wnt9a results in severely delayed endochondral ossification, demonstrating that Wls-dependent non-canonical Wnt signaling regulates coordinated cartilage maturation and the timing of osteogenic differentiation.","method":"Zebrafish genetic mutant analysis, Alcian blue/Alizarin red staining, histology, marker analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — multi-mutant genetic analysis with quantitative developmental phenotype; single organism","pmids":["27908786"],"is_preprint":false},{"year":2018,"finding":"In the absence of Wnt ligands, Evi/Wls abundance is regulated by ubiquitin-proteasome-mediated endoplasmic reticulum-associated degradation (ERAD). Evi is ubiquitinated by the E2-conjugating enzyme UBE2J2 and the E3-ligase CGRRF1. A triaging complex of Porcupine (PORCN) and VCP/p97 determines whether Evi enters the secretory pathway or is degraded via ERAD, thereby adjusting Evi levels to match Wnt export demand.","method":"siRNA knockdown, co-immunoprecipitation, ubiquitination assays, proteasome inhibitor experiments, ERAD pathway dissection","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — identification of specific E2, E3, and AAA-ATPase with co-IP and functional rescue; multiple orthogonal approaches","pmids":["29378775"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM structure of palmitoleated human WNT8A in complex with WLS resolved at 3.2 Å reveals that the WLS membrane domain has close structural homology to G protein-coupled receptors (GPCRs). A Wnt hairpin inserts into a conserved hydrophobic cavity in the GPCR-like domain of WLS, and the palmitoleate moiety protrudes between two WLS helices into the lipid bilayer. A second conserved Wnt hairpin undergoes a conformational switch that may facilitate Wnt transfer to receiving cells.","method":"Cryo-electron microscopy (3.2 Å), biochemical binding experiments, mutagenesis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — high-resolution cryo-EM structure with biochemical validation; provides direct molecular mechanism for Wnt-WLS interaction","pmids":["33357447"],"is_preprint":false},{"year":2020,"finding":"TMEM132A physically interacts with WLS and stabilizes Wnt ligands, enhances the WLS-Wnt ligand interaction, and activates the Wnt signaling pathway, identifying TMEM132A as a novel regulator of Wnt ligand trafficking and secretion.","method":"Co-immunoprecipitation, Wnt luciferase reporter assays, siRNA knockdown, protein stability assays","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP with functional reporter assay; single lab, limited mechanistic depth","pmids":["33324648"],"is_preprint":false},{"year":2011,"finding":"Evi/Wls/GPR177 is a specific regulator of pan-Wnt protein secretion affecting both canonical and non-canonical signaling. Depletion of Evi/Wls in glioma and glioma stem-like cells reduces cell proliferation, induces apoptosis, and reduces cell migration and tumor formation in vivo. Evi/Wls overexpression is sufficient to promote downstream Wnt signaling.","method":"siRNA/shRNA knockdown of Evi/Wls, cell proliferation assays, apoptosis assays, migration assays, in vivo xenograft tumor formation, Wnt reporter assays","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — KD with multiple cellular readouts including in vivo; OE with signaling readout; single lab","pmids":["22147553"],"is_preprint":false}],"current_model":"WLS/Wntless (GPR177/Evi) is a multi-pass transmembrane protein with GPCR-like membrane domain topology that acts as a dedicated cargo receptor in Wnt-producing cells: it binds palmitoylated Wnt ligands (via insertion of a Wnt hairpin into a hydrophobic cavity, with the palmitoleate extending into the bilayer) and escorts them through the secretory pathway; its intracellular recycling from endosomes to the trans-Golgi network by the retromer complex and AP-2-mediated endocytosis maintains the Wls pool required for continuous Wnt secretion, while its steady-state abundance is controlled by ERAD (via UBE2J2/CGRRF1/VCP) in the absence of Wnt ligands, and Wnt-loaded Evi can also be released in exosome-like vesicles (requiring Rab11, Myosin5, and Syntaxin 1A) for trans-synaptic Wnt transmission."},"narrative":{"teleology":[{"year":2006,"claim":"Two independent groups simultaneously identified Wntless/Evi as the first gene specifically required in Wnt-producing cells for Wnt ligand secretion, answering whether a dedicated transmembrane factor exists upstream of Wnt release.","evidence":"RNAi screens, clonal analysis and genetic epistasis in Drosophila, C. elegans, and human cells","pmids":["16678096","16678095"],"confidence":"High","gaps":["Mechanism of Wnt-WLS binding unknown","Unclear whether WLS acts on all Wnt family members","Trafficking route of WLS itself not determined"]},{"year":2007,"claim":"The intracellular itinerary of WLS was defined: AP-2-mediated endocytosis retrieves WLS from the plasma membrane, and the retromer complex recycles it from endosomes to the TGN, solving how the cell sustains the WLS pool needed for continuous Wnt export.","evidence":"Co-IP of Wls with Vps35, fluorescence localization of MIG-14/Wls in retromer and AP-2 mutants in C. elegans and Drosophila","pmids":["18160348","18160346"],"confidence":"High","gaps":["Sorting signals on WLS for retromer and AP-2 recognition not mapped","Whether additional trafficking machinery participates remains untested"]},{"year":2009,"claim":"Discovery that WLS-containing exosome-like vesicles mediate trans-synaptic Wingless delivery at the Drosophila NMJ answered how a lipidated Wnt traverses the synaptic cleft and revealed an unexpected postsynaptic role for Evi in targeting dGRIP.","evidence":"Immunoelectron microscopy of MVBs at synaptic boutons, genetic rescue of pre- and postsynaptic Evi function","pmids":["19837038"],"confidence":"High","gaps":["Whether exosomal WLS-Wnt delivery operates in mammalian synapses is unknown","Postsynaptic mechanism of Evi action beyond dGRIP localization is unresolved"]},{"year":2010,"claim":"Establishing that Porcupine-dependent palmitoylation of a conserved Wnt serine is a prerequisite for WLS binding, and that low luminal pH triggers Wnt release, defined the biochemical basis of cargo recognition and unloading.","evidence":"Ser209 mutagenesis of WNT3A, co-IP with WLS, V-ATPase inhibition causing WNT3A-WLS accumulation at PM, Xenopus CE assay","pmids":["20826466","22108505"],"confidence":"High","gaps":["Structural basis for lipid-dependent recognition not yet resolved at this point","pH-sensing residues in WLS not identified"]},{"year":2012,"claim":"Systematic analysis of all 19 human Wnts confirmed WLS as a universal secretion factor, while exosome release was shown to depend on Rab11, Myosin5, and Syntaxin 1A, answering both the generality and machinery questions for WLS-mediated Wnt export.","evidence":"Gateway library of 19 Wnts with WLS/PORCN knockdown; dsRNA screen, EM, and mass spectrometry of Evi exosomes at Drosophila NMJ","pmids":["22784633","22437826"],"confidence":"High","gaps":["Whether exosomal versus direct secretion pathways are differentially used for specific Wnts is unknown","Stoichiometry of Wnt loading per exosome not determined"]},{"year":2012,"claim":"Conditional Wls knockouts in mouse limb mesenchyme, ectoderm, and epidermis demonstrated that WLS-dependent Wnt secretion is essential for limb outgrowth, hair follicle induction, skin barrier integrity, and immune cell homeostasis, establishing broad in vivo requirements.","evidence":"Cre-lox conditional Wls deletion in multiple tissue compartments with histological and immunological phenotyping","pmids":["22377357","23918954","23029304"],"confidence":"High","gaps":["Which specific Wnt ligands mediate each tissue phenotype is incompletely resolved","Compensatory mechanisms in surviving tissue not characterized"]},{"year":2013,"claim":"Demonstration that Wnt/β-catenin signaling in APC-mutant colorectal cancer cells still depends on Evi/WLS-mediated Wnt ligand secretion challenged the assumption that downstream pathway mutations render autocrine Wnt secretion irrelevant, identifying WLS as a potential therapeutic vulnerability.","evidence":"Evi/WLS knockdown in colon cancer cells carrying APC mutations with β-catenin reporter readout","pmids":["24162018"],"confidence":"High","gaps":["In vivo therapeutic efficacy of WLS inhibition in APC-mutant tumors untested","Which specific Wnt ligands sustain autocrine signaling not fully defined"]},{"year":2018,"claim":"Identification of the ERAD pathway (UBE2J2 as E2, CGRRF1 as E3, VCP/p97 as extractase) that degrades unloaded WLS answered how the cell tunes WLS abundance to match Wnt production demand, with PORCN acting as a triage factor.","evidence":"Co-IP, ubiquitination assays, proteasome inhibitor experiments, siRNA epistasis in mammalian cells","pmids":["29378775"],"confidence":"High","gaps":["Ubiquitination sites on WLS not mapped","Whether additional E3 ligases contribute is unclear","Structural basis for PORCN-mediated triage not resolved"]},{"year":2020,"claim":"The 3.2 Å cryo-EM structure of palmitoleated WNT8A bound to WLS revealed the molecular architecture: WLS adopts a GPCR-like seven-TM fold and captures the Wnt palmitoleate via a hydrophobic cavity, providing the first atomic-resolution view of the cargo receptor mechanism.","evidence":"Cryo-electron microscopy of the human WNT8A–WLS complex with mutagenesis validation","pmids":["33357447"],"confidence":"High","gaps":["No structure of WLS in its apo or endosomal-pH state","Conformational changes during Wnt release not captured experimentally","Whether the second Wnt hairpin conformational switch occurs in all Wnts is unverified"]},{"year":null,"claim":"Key open questions include the structural basis for pH-triggered Wnt dissociation from WLS, the identity of sorting signals recognized by retromer and AP-2 on WLS, whether exosomal versus direct secretory routes are differentially utilized for specific Wnt family members, and the in vivo therapeutic potential of targeting WLS in Wnt-dependent cancers.","evidence":"","pmids":[],"confidence":"High","gaps":["No apo-WLS or low-pH WLS structure available","Sorting signals on WLS cytoplasmic domains not mapped","In vivo efficacy of WLS-targeted cancer therapy not demonstrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[0,1,5,6,16]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[5,16]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[5,15]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[2,3]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2,3]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4,7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,8,12,16]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,3,4,7]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[2,3,15]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,13,14]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[15]}],"complexes":[],"partners":["VPS35","UBE2J2","CGRRF1","VCP","PORCN","TMEM132A"],"other_free_text":[]},"mechanistic_narrative":"WLS (Wntless/Evi/GPR177) is a multi-pass transmembrane cargo receptor that is essential in Wnt-producing cells for the secretion of all lipid-modified Wnt ligands across metazoans [PMID:16678096, PMID:16678095, PMID:22784633]. Cryo-EM reveals that WLS adopts a GPCR-like seven-transmembrane fold harboring a hydrophobic cavity into which a palmitoylated Wnt hairpin inserts, with the palmitoleate moiety extending into the bilayer; binding requires Porcupine-dependent lipidation of a conserved Wnt serine, and low endosomal pH facilitates Wnt release [PMID:33357447, PMID:20826466, PMID:22108505]. The intracellular WLS pool is maintained by retromer-mediated recycling from endosomes to the trans-Golgi network and AP-2-dependent endocytosis from the plasma membrane, while in the absence of Wnt cargo WLS is cleared by ERAD through UBE2J2/CGRRF1-mediated ubiquitination and VCP-dependent extraction [PMID:18160348, PMID:18160346, PMID:29378775]. WLS-loaded vesicles released as exosomes at Drosophila synapses—dependent on Rab11, Myosin5, and Syntaxin 1A—enable trans-synaptic Wnt transmission, and tissue-specific Wls deletion in mice disrupts limb patterning, hair follicle development, and skin immune homeostasis [PMID:19837038, PMID:22437826, PMID:22377357, PMID:23918954]."},"prefetch_data":{"uniprot":{"accession":"Q5T9L3","full_name":"Protein wntless homolog","aliases":["Integral membrane protein GPR177","Protein evenness interrupted homolog","EVI","Putative NF-kappa-B-activating protein 373"],"length_aa":541,"mass_kda":62.3,"function":"Regulates Wnt proteins sorting and secretion in a feedback regulatory mechanism. This reciprocal interaction plays a key role in the regulation of expression, subcellular location, binding and organelle-specific association of Wnt proteins (PubMed:34587386). Plays also an important role in establishment of the anterior-posterior body axis formation during development (By similarity)","subcellular_location":"Golgi apparatus membrane; Cytoplasmic vesicle membrane; Cell membrane; Endoplasmic reticulum membrane; Golgi apparatus membrane; Early endosome membrane","url":"https://www.uniprot.org/uniprotkb/Q5T9L3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WLS","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2},{"gene":"TMED10","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/WLS","total_profiled":1310},"omim":[{"mim_id":"619648","title":"ZAKI SYNDROME; ZKS","url":"https://www.omim.org/entry/619648"},{"mim_id":"615406","title":"GNG12 ANTISENSE RNA 1, NONCODING; GNG12AS1","url":"https://www.omim.org/entry/615406"},{"mim_id":"611514","title":"WNT LIGAND SECRETION MEDIATOR; WLS","url":"https://www.omim.org/entry/611514"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endoplasmic reticulum","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/WLS"},"hgnc":{"alias_symbol":["FLJ23091","MRP","EVI","mig-14"],"prev_symbol":["C1orf139","GPR177"]},"alphafold":{"accession":"Q5T9L3","domains":[{"cath_id":"1.20.1070","chopping":"4-38_228-491","consensus_level":"high","plddt":86.615,"start":4,"end":491},{"cath_id":"-","chopping":"42-226","consensus_level":"high","plddt":89.3691,"start":42,"end":226}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5T9L3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q5T9L3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q5T9L3-F1-predicted_aligned_error_v6.png","plddt_mean":82.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WLS","jax_strain_url":"https://www.jax.org/strain/search?query=WLS"},"sequence":{"accession":"Q5T9L3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q5T9L3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q5T9L3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5T9L3"}},"corpus_meta":[{"pmid":"7954421","id":"PMC_7954421","title":"Pharmacological 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and phenocopies wg loss-of-function, placing evi in the Wg-producing cell by epistasis and clonal analysis.\",\n      \"method\": \"Drosophila RNAi screen, genetic epistasis, clonal analysis, in vivo phenotypic rescue\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal epistasis + clonal analysis + human cell depletion, foundational discovery paper with >450 citations\",\n      \"pmids\": [\"16678096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"WLS (Evi) is released in exosome-like vesicles at the Drosophila neuromuscular junction and this vesicular release is required for trans-synaptic Wingless secretion; additionally, Evi functions cell-autonomously in the postsynaptic cell to target dGRIP to synaptic sites for Wnt signal transduction.\",\n      \"method\": \"Live imaging, genetic loss-of-function, electron microscopy, immunostaining at NMJ\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (EM, genetics, imaging) in vivo, >360 citations\",\n      \"pmids\": [\"19837038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In C. elegans, MIG-14 (WLS ortholog) undergoes intracellular trafficking regulated by AP-2 (clathrin adaptor, DPY-23) and retromer: AP-2 loss causes MIG-14 accumulation at/near the plasma membrane, while retromer loss causes MIG-14 accumulation in intracellular compartments, indicating that AP-2-mediated endocytosis and retromer-dependent recycling control MIG-14 availability for Wnt secretion.\",\n      \"method\": \"C. elegans genetics, epistasis, immunostaining, loss-of-function mutant analysis\",\n      \"journal\": \"Developmental Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with defined localization phenotypes, >170 citations\",\n      \"pmids\": [\"18160346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"WLS binds WNT3A in the ER, and this interaction requires PORCN-dependent lipid modification (palmitoylation) of WNT3A at serine 209; vacuolar acidification is required to release palmitoylated WNT3A from WLS in secretory vesicles, as V-ATPase inhibition causes accumulation of the WNT3A–WLS complex.\",\n      \"method\": \"Small molecule screen, pharmacological V-ATPase inhibition, cell fractionation, Xenopus in vivo assays, structural modeling\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (biochemical, pharmacological, in vivo), >160 citations\",\n      \"pmids\": [\"20826466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Porcupine-mediated lipidation of the conserved serine residue (equivalent to Wg S239) is essential for the physical and functional interaction of Wnt ligands with WLS; all Drosophila Wnts except WntD (which lacks this serine and Porcupine dependence) require WLS for secretion.\",\n      \"method\": \"Systematic Drosophila Wnt family knockdown/overexpression, site-directed mutagenesis, co-immunoprecipitation\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis of key residue + co-IP + systematic functional analysis, >150 citations\",\n      \"pmids\": [\"22108505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Evi/WLS vesicle release at synaptic boutons requires Rab11, its effector Myosin5, and Syntaxin 1A (Syx1A); multivesicular bodies containing Evi were identified ultrastructurally at boutons, and secreted Evi vesicles share biochemical and morphological characteristics of exosomes.\",\n      \"method\": \"dsRNA screen in cultured cells, in vivo motoneuron genetics, mass spectrometry, electron microscopy, biochemical fractionation\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (EM, MS, genetics, biochemistry), >230 citations\",\n      \"pmids\": [\"22437826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"WLS/Evi (GPR177) is a specific regulator of pan-Wnt protein secretion affecting both canonical and non-canonical Wnt signaling; its depletion in glioma cells reduces proliferation, induces apoptosis, impairs migration, and reduces in vivo tumor formation, while overexpression promotes downstream Wnt signaling.\",\n      \"method\": \"RNAi knockdown, overexpression, in vivo xenograft tumor formation assay, cell proliferation and migration assays\",\n      \"journal\": \"EMBO Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD/OE with defined cellular phenotypes, single lab study\",\n      \"pmids\": [\"22147553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"WLS/Evi abundance is regulated by ERAD (ER-associated degradation): in the absence of Wnt ligands, WLS is ubiquitinated by E2-conjugating enzyme UBE2J2 and E3-ligase CGRRF1 and degraded in a VCP-dependent manner; Porcupine (PORCN) and VCP form a triaging complex that determines whether WLS enters the secretory or ERAD pathway.\",\n      \"method\": \"siRNA screen, co-immunoprecipitation, ubiquitination assays, proteasome inhibition, genetic epistasis\",\n      \"journal\": \"The EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods identifying writers (UBE2J2, CGRRF1) and regulatory complex (PORCN/VCP), rigorous biochemical validation\",\n      \"pmids\": [\"29378775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structure of palmitoleated human WNT8A in complex with WLS at 3.2 Å resolution reveals that the WLS membrane domain has close structural homology to GPCRs; a Wnt hairpin inserts into a conserved hydrophobic cavity in the GPCR-like domain with the palmitoleate protruding between two helices into the bilayer; a conformational switch on a separate Wnt hairpin may contribute to Wnt transfer to receiving cells.\",\n      \"method\": \"Cryo-EM structure determination, biochemical validation experiments\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure (3.2 Å) with biochemical validation, >63 citations\",\n      \"pmids\": [\"33357447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Conditional knockout of Evi/WLS in the epidermis (K14-Cre) results in hair loss after the first hair cycle, impaired skin barrier, psoriasiform inflammation, immune cell infiltration, and depletion of dendritic epidermal T cells, demonstrating an essential role of epidermal Wnt secretion in skin homeostasis and immune cell recruitment/survival.\",\n      \"method\": \"Conditional knockout mouse model, gene expression profiling, immunohistochemistry, immune cell analysis\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean tissue-specific KO with defined cellular and molecular phenotypes\",\n      \"pmids\": [\"23918954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Conditional deletion of Wls in limb mesenchyme prevents differentiation of distal mesenchyme and arrests limb outgrowth (likely via Wnt5a); deletion in ectoderm causes agenesis of distal limb tissue, loss of mesenchymal cell proliferation/survival, and failure of distal tendon/ligament induction, myoblast migration, and dermis formation.\",\n      \"method\": \"Conditional knockout mouse (mesenchymal and ectodermal Cre drivers), histology, cellular behavior analysis\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with multiple defined phenotypic readouts\",\n      \"pmids\": [\"22377357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Wls conditional knockout in hair follicle epidermis (K14-cre;Wls(c/c)) causes abnormal hair follicle development attributable to impaired canonical Wnt/β-catenin signaling; Wnt5a knockout does not show this phenotype, implicating Wls specifically in β-catenin-dependent Wnt secretion during embryonic hair follicle induction.\",\n      \"method\": \"Conditional knockout mouse, genetic comparison with Wnt5a null, immunostaining, signaling pathway analysis\",\n      \"journal\": \"PloS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with pathway placement, single lab\",\n      \"pmids\": [\"23029304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TMEM132A physically interacts with WLS, stabilizes Wnt ligand, enhances WLS–Wnt ligand interaction, and activates Wnt signaling, identifying TMEM132A as a novel regulator of Wnt secretion through WLS.\",\n      \"method\": \"Co-immunoprecipitation, Wnt reporter assays, protein stability assays, overexpression/knockdown\",\n      \"journal\": \"Frontiers in Cell and Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP with functional follow-up, single lab study\",\n      \"pmids\": [\"33324648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In zebrafish, wls (expressed in ectoderm) is required for convergent-extension during palate morphogenesis; genetic analysis places wls upstream of wnt9a and wnt5b in non-canonical Wnt signaling controlling cell intercalation and palate extension.\",\n      \"method\": \"Zebrafish mutant analysis, genetic epistasis with wnt9a, wnt5b, gpc4, frzb mutants\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in zebrafish, multiple mutant combinations tested\",\n      \"pmids\": [\"27287801\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WLS (Wntless/Evi/GPR177) is a multipass transmembrane protein that acts as a dedicated cargo receptor for Wnt ligands in the secretory pathway: it binds Wnts in the ER in a Porcupine-dependent, palmitoylation-dependent manner (requiring the conserved lipid-modified serine on Wnt), transports them to the cell surface or into exosome-like vesicles for secretion, is recycled via AP-2-mediated endocytosis and retromer-dependent retrograde trafficking, and is degraded by ERAD (via UBE2J2/CGRRF1/VCP) when Wnt ligands are absent; its GPCR-like membrane domain structure, revealed by cryo-EM, accommodates the Wnt palmitoleate in a hydrophobic cavity, and release of Wnt from WLS requires vacuolar acidification.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries only from KEEP papers.\n\n**Classification:**\n- WLS (Wntless/GPR177/Evi/Sprinter) = the Wnt cargo receptor/transporter\n- EXCLUDE: Papers about MRP (multidrug resistance protein/ABCC family), RNase MRP, MRP-8/S100A8, MRP-14/S100A9, MARCKS-related protein, Mrp antiporters (bacterial), Moringa polysaccharide, EVI-1 (zinc finger oncogene), mig-14 (Salmonella), Mrp complex (bacterial Na+/H+ antiporter), wheat ABCC transporters, etc.\n\n**KEEP papers (WLS/Wntless):**\n- PMID 16678096 (Bartscherer 2006 - Evi/Wls discovery in Drosophila)\n- PMID 16678095 (Bänziger 2006 - Wntless discovery)\n- PMID 19837038 (Korkut 2009 - trans-synaptic vesicular Wnt transmission)\n- PMID 22437826 (Koles 2012 - Evi exosome release mechanism)\n- PMID 18160346 (Pan 2007 - C. elegans AP-2/retromer/mig-14/Wntless)\n- PMID 20826466 (Coombs 2010 - WLS-dependent WNT3A secretion)\n- PMID 22108505 (Herr 2011 - Porcupine lipidation required for Wls)\n- PMID 33357447 (Nygaard 2020 - cryo-EM structure WLS/WNT8A)\n- PMID 22147553 (Augustin 2011 - Evi/Gpr177 in glioma)\n- PMID 22377357 (Zhu 2012 - Wls in limb patterning)\n- PMID 23918954 (Augustin 2013 - epidermal Evi/Wls knockout)\n- PMID 23029304 (Huang 2012 - Wls in hair follicle induction)\n- PMID 18160348 (Belenkaya 2007 - retromer recycles Wntless)\n- PMID 24162018 (Voloshanenko 2013 - Wnt secretion in colon cancer)\n- PMID 29378775 (Glaeser 2018 - ERAD-dependent control of Evi)\n- PMID 33324648 (Li 2020 - TMEM132A/WLS interaction)\n- PMID 22784633 (Najdi 2012 - Wnt expression library, WLS essential)\n- PMID 27287801 (Rochard 2016 - wls in zebrafish palate)\n- PMID 27908786 (Ling 2016 - wls in zebrafish craniofacial)\n- PMID 26186194 (BioPlex - interaction network, WLS incidentally included - EXCLUDE, not mechanistic about WLS specifically)\n- PMID 28514442 (BioPlex 2.0 - same, EXCLUDE)\n- PMID 33961781 (BioPlex 3.0 - same, EXCLUDE)\n- PMID 26911590 (Mullin 2016 - GWAS BMD/WLS - EXCLUDE, no mechanism)\n- PMID 22504420 (Estrada 2012 - GWAS BMD - EXCLUDE)\n- PMID 19801982 (Rivadeneira 2009 - GWAS BMD GPR177 - EXCLUDE)\n- PMID 17804805 (Binnerts 2007 - RSpo1/LRP6, not WLS mechanism - EXCLUDE)\n- Other curated papers (cDNA collections, interactome maps without WLS-specific findings) - EXCLUDE for mechanistic extraction\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"Wntless (Wls/Evi) is a conserved multipass transmembrane protein required in Wnt-producing cells for secretion of Wingless/Wnt ligands. RNAi depletion of Evi in Drosophila phenocopies wg loss-of-function, and Wg is retained intracellularly in evi mutant cells. Epistasis and clonal analysis place Evi in the Wg-producing cell, establishing it as the founding member of a gene family specifically required for Wg/Wnt secretion.\",\n      \"method\": \"RNAi screen, genetic epistasis, clonal analysis, immunofluorescence in Drosophila\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis + clonal analysis + loss-of-function phenotype; independently replicated in same year by Bänziger et al.\",\n      \"pmids\": [\"16678096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Wntless (Wls) is required in Wnt-sending cells to promote secretion of Wnt proteins. Loss of Wls blocks Wingless-dependent patterning in Drosophila, MOM-2-governed polarization in C. elegans, and Wnt3a-mediated signaling in cultured human cells, indicating an ancient, dedicated partnership between Wls and all Wnt ligands analyzed.\",\n      \"method\": \"Genetic loss-of-function in Drosophila and C. elegans, siRNA knockdown in human cells, reporter assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multi-organism genetic epistasis, replicated across three systems; independent simultaneous replication by Bartscherer et al.\",\n      \"pmids\": [\"16678095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The retromer complex is required for Wnt secretion by recycling Wntless (Wls) from endosomes back to the trans-Golgi network (TGN). The retromer subunit Vps35 co-localizes with and co-immunoprecipitates Wls in endosomes; Wls becomes unstable in the absence of retromer activity, depleting the pool available for Wnt secretion.\",\n      \"method\": \"Co-immunoprecipitation, co-localization imaging, genetic loss-of-function (Drosophila and mammalian cells), protein stability assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, epistasis, direct localization with functional consequence; replicated in same issue by Pan et al.\",\n      \"pmids\": [\"18160348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In C. elegans, the mu subunit of clathrin adaptor AP-2 (DPY-23) acts in Wnt-expressing cells to regulate Wnt function through control of MIG-14/Wntless trafficking. In dpy-23 mutants, MIG-14 accumulates at or near the plasma membrane, whereas in retromer mutants MIG-14 accumulates in intracellular compartments, indicating that AP-2-mediated endocytosis and retromer-mediated recycling together control the intracellular itinerary of MIG-14/Wntless.\",\n      \"method\": \"C. elegans genetics, epistasis, fluorescence localization of MIG-14 in loss-of-function mutants\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in vivo with direct localization readout; convergent with Belenkaya et al. findings\",\n      \"pmids\": [\"18160346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"At the Drosophila neuromuscular junction, Wnt/Wingless is transmitted trans-synaptically via exosome-like vesicles containing Evi/Wls. Presynaptic vesicular release of Evi is required for Wingless secretion. Additionally, Evi acts cell-autonomously in the postsynaptic (Wnt-receiving) cell to target dGRIP to postsynaptic sites; loss of Evi in the postsynaptic cell mislocalizes dGRIP and impairs Wnt signal transduction.\",\n      \"method\": \"Live imaging, immunoelectron microscopy, genetic loss-of-function, cell-autonomous rescue experiments at Drosophila NMJ\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct vesicle imaging by EM, genetic epistasis, cell-autonomous rescue; strong evidence for dual pre- and postsynaptic Evi function\",\n      \"pmids\": [\"19837038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"WLS is ER-resident in human cells and WNT3A binding to WLS requires PORCN-dependent lipid modification (palmitoylation) of WNT3A at serine 209. Inhibition of vacuolar acidification blocks release of WNT3A from WLS, causing accumulation of the WNT3A-WLS complex at the plasma membrane, suggesting that low endosomal/vesicular pH is required to dissociate palmitoylated WNT3A from WLS during secretion. Modeling predicts WLS contains a lipocalin-family lipid-binding β-barrel domain.\",\n      \"method\": \"Pharmacological inhibition of V-ATPase, WNT3A Ser209 mutagenesis, co-immunoprecipitation, subcellular fractionation, Xenopus convergent-extension assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis of critical residue, co-IP, in vivo functional assay, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"20826466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Porcupine-mediated lipidation of a conserved serine residue (equivalent to Wg Ser239) is essential for all Drosophila Wnt family members (except WntD, which lacks this residue) to interact with and be secreted by Wls. WntD neither requires Porcupine nor Wls for secretion. Glycosylation status of Wg does not determine Wls-dependence.\",\n      \"method\": \"Systematic Drosophila genetics, Wnt secretion assays, site-directed mutagenesis of conserved serine, co-immunoprecipitation\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis of critical residue + co-IP + systematic genetic analysis across all Drosophila Wnts\",\n      \"pmids\": [\"22108505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Release of Evi/Wls-containing exosomes at the Drosophila NMJ requires Rab11, its effector Myosin5, and Syntaxin 1A (Syx1A). These proteins were identified by dsRNA screen in cultured cells and validated in vivo in motoneurons. Ultrastructural analysis revealed multivesicular bodies containing Evi at synaptic boutons. Mass spectrometry and biochemical characterization confirmed that secreted Evi vesicles are bona fide exosomes.\",\n      \"method\": \"dsRNA screen, in vivo motoneuron genetic manipulation, electron microscopy, mass spectrometry, biochemical fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — screen + in vivo validation + EM ultrastructure + mass spectrometry; multiple orthogonal methods\",\n      \"pmids\": [\"22437826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Wntless (WLS) and Porcupine (PORCN) are essential for all 19 human Wnt ligands to signal through both β-catenin-dependent and independent pathways, establishing WLS as a universal Wnt secretion factor. Wnts show considerable variation in stability, processing, and secretion levels despite similar mRNA expression.\",\n      \"method\": \"Comprehensive Gateway library of all 19 human Wnts, siRNA knockdown of WLS/PORCN, β-catenin reporter assays, LRP6 phosphorylation assays\",\n      \"journal\": \"Differentiation; research in biological diversity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic functional analysis of all 19 Wnts with WLS knockdown, multiple signaling readouts\",\n      \"pmids\": [\"22784633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Conditional deletion of Wls in limb mesenchyme prevents differentiation of distal mesenchyme and arrests limb outgrowth (likely by affecting Wnt5a function), while ectodermal Wls deletion causes agenesis of distal limb tissue, loss of tendon/ligament induction, impaired myoblast migration, and absence of dermis formation, demonstrating that WLS-dependent Wnt secretion from two distinct tissue compartments controls distinct aspects of limb patterning.\",\n      \"method\": \"Conditional Wls knockout (Cre-lox) in limb mesenchyme and ectoderm, histology, marker analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific conditional KO with defined phenotypic readouts\",\n      \"pmids\": [\"22377357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Conditional deletion of Wls in the epidermis (K14-Cre) causes hair loss after the first cycle, impaired skin barrier function, psoriasis-like inflammation, depletion of dendritic epidermal T cells, and infiltration of γδ-low T cells, demonstrating that epidermal Wnt secretion via Wls is essential for normal skin homeostasis and immune cell homeostasis.\",\n      \"method\": \"Conditional Wls knockout, histology, flow cytometry, expression profiling, comparison to human psoriasis biopsies\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined immune and structural phenotypes\",\n      \"pmids\": [\"23918954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Wls is expressed in the epidermis during embryonic hair follicle induction, and conditional K14-Cre deletion of Wls causes abnormal hair follicle development associated with impaired canonical Wnt/β-catenin signaling. Wnt5a expressed in embryonic epidermis is dispensable for this process, indicating that Wls-dependent canonical Wnt ligands mediate follicle induction.\",\n      \"method\": \"Conditional Wls knockout, immunofluorescence, β-catenin reporter analysis, comparison with Wnt5a null mice\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with mechanistic inference, but single lab, single tissue system\",\n      \"pmids\": [\"23029304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Colorectal tumor cells express elevated levels of Wnt3 and Evi/Wls/GPR177, and even in the presence of APC or β-catenin mutations, downstream Wnt/β-catenin signaling remains dependent on Wnt ligand secretion via Evi/Wls. Truncated APC proteins bind β-catenin and destruction complex components, and Evi/Wls knockdown reduces β-catenin signaling in colon cancer cells.\",\n      \"method\": \"siRNA knockdown of Evi/Wls, β-catenin reporter assays, co-immunoprecipitation of APC with destruction complex, tumor expression analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional KD with signaling readout + co-IP; multiple colon cancer cell lines tested\",\n      \"pmids\": [\"24162018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In zebrafish palate morphogenesis, Wls and its ligands Wnt9a and Wnt5b are expressed in the ectoderm, while juxtaposed chondrocytes express Frzb and Gpc4. Genetic analysis using wls, gpc4, frzb, wnt9a, and wnt5b mutants demonstrates that non-canonical Wnt signaling through Wls is required for cell intercalation during convergent-extension, with Wnt5b and Wnt9a controlling extension in distinct axes.\",\n      \"method\": \"Zebrafish mutant analysis, genetic epistasis, in situ hybridization, live imaging of cell intercalation\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multi-mutant genetic epistasis in vivo; single organism/system\",\n      \"pmids\": [\"27287801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In zebrafish craniofacial development, disruption of wls causes significant loss of craniofacial bone, whereas loss of gpc4, wnt5b, or wnt9a results in severely delayed endochondral ossification, demonstrating that Wls-dependent non-canonical Wnt signaling regulates coordinated cartilage maturation and the timing of osteogenic differentiation.\",\n      \"method\": \"Zebrafish genetic mutant analysis, Alcian blue/Alizarin red staining, histology, marker analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multi-mutant genetic analysis with quantitative developmental phenotype; single organism\",\n      \"pmids\": [\"27908786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In the absence of Wnt ligands, Evi/Wls abundance is regulated by ubiquitin-proteasome-mediated endoplasmic reticulum-associated degradation (ERAD). Evi is ubiquitinated by the E2-conjugating enzyme UBE2J2 and the E3-ligase CGRRF1. A triaging complex of Porcupine (PORCN) and VCP/p97 determines whether Evi enters the secretory pathway or is degraded via ERAD, thereby adjusting Evi levels to match Wnt export demand.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, ubiquitination assays, proteasome inhibitor experiments, ERAD pathway dissection\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — identification of specific E2, E3, and AAA-ATPase with co-IP and functional rescue; multiple orthogonal approaches\",\n      \"pmids\": [\"29378775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structure of palmitoleated human WNT8A in complex with WLS resolved at 3.2 Å reveals that the WLS membrane domain has close structural homology to G protein-coupled receptors (GPCRs). A Wnt hairpin inserts into a conserved hydrophobic cavity in the GPCR-like domain of WLS, and the palmitoleate moiety protrudes between two WLS helices into the lipid bilayer. A second conserved Wnt hairpin undergoes a conformational switch that may facilitate Wnt transfer to receiving cells.\",\n      \"method\": \"Cryo-electron microscopy (3.2 Å), biochemical binding experiments, mutagenesis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure with biochemical validation; provides direct molecular mechanism for Wnt-WLS interaction\",\n      \"pmids\": [\"33357447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TMEM132A physically interacts with WLS and stabilizes Wnt ligands, enhances the WLS-Wnt ligand interaction, and activates the Wnt signaling pathway, identifying TMEM132A as a novel regulator of Wnt ligand trafficking and secretion.\",\n      \"method\": \"Co-immunoprecipitation, Wnt luciferase reporter assays, siRNA knockdown, protein stability assays\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP with functional reporter assay; single lab, limited mechanistic depth\",\n      \"pmids\": [\"33324648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Evi/Wls/GPR177 is a specific regulator of pan-Wnt protein secretion affecting both canonical and non-canonical signaling. Depletion of Evi/Wls in glioma and glioma stem-like cells reduces cell proliferation, induces apoptosis, and reduces cell migration and tumor formation in vivo. Evi/Wls overexpression is sufficient to promote downstream Wnt signaling.\",\n      \"method\": \"siRNA/shRNA knockdown of Evi/Wls, cell proliferation assays, apoptosis assays, migration assays, in vivo xenograft tumor formation, Wnt reporter assays\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with multiple cellular readouts including in vivo; OE with signaling readout; single lab\",\n      \"pmids\": [\"22147553\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WLS/Wntless (GPR177/Evi) is a multi-pass transmembrane protein with GPCR-like membrane domain topology that acts as a dedicated cargo receptor in Wnt-producing cells: it binds palmitoylated Wnt ligands (via insertion of a Wnt hairpin into a hydrophobic cavity, with the palmitoleate extending into the bilayer) and escorts them through the secretory pathway; its intracellular recycling from endosomes to the trans-Golgi network by the retromer complex and AP-2-mediated endocytosis maintains the Wls pool required for continuous Wnt secretion, while its steady-state abundance is controlled by ERAD (via UBE2J2/CGRRF1/VCP) in the absence of Wnt ligands, and Wnt-loaded Evi can also be released in exosome-like vesicles (requiring Rab11, Myosin5, and Syntaxin 1A) for trans-synaptic Wnt transmission.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"WLS (Wntless/Evi/GPR177) is a conserved multipass transmembrane cargo receptor essential for the secretion of nearly all Wnt family ligands from producing cells, functioning in both canonical and non-canonical Wnt signaling across species [PMID:16678096, PMID:22147553]. WLS binds lipid-modified Wnt ligands in the endoplasmic reticulum in a Porcupine-dependent manner—requiring palmitoylation of a conserved serine residue—and its cryo-EM structure reveals a GPCR-like transmembrane domain that accommodates the Wnt palmitoleate in a hydrophobic cavity; release of Wnt from WLS in secretory compartments depends on vacuolar acidification [PMID:20826466, PMID:22108505, PMID:33357447]. WLS is recycled from the plasma membrane via AP-2/clathrin-mediated endocytosis and retromer-dependent retrograde transport, and in the absence of Wnt ligands it is triaged for ERAD-mediated degradation through UBE2J2, CGRRF1, and VCP [PMID:18160346, PMID:29378775]. WLS also mediates exosome-dependent Wnt secretion at synapses via Rab11/Myosin5/Syntaxin1A-dependent multivesicular body release, and tissue-specific knockout studies demonstrate its essential roles in limb development, hair follicle cycling, skin barrier integrity, and palate morphogenesis [PMID:19837038, PMID:22437826, PMID:22377357, PMID:23918954].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"The identification of WLS/Evi as a transmembrane protein required in Wnt-producing cells for ligand secretion established the first dedicated Wnt cargo receptor, answering how Wnt ligands exit the secretory pathway.\",\n      \"evidence\": \"Drosophila RNAi screen, clonal analysis, and genetic epistasis showing Wg retention in evi-mutant cells\",\n      \"pmids\": [\"16678096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of WLS–Wnt interaction unknown\", \"Whether WLS acts on all Wnt family members not tested\", \"Recycling route of WLS not yet mapped\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that WLS (MIG-14) undergoes AP-2-dependent endocytosis and retromer-dependent retrograde recycling revealed the intracellular trafficking circuit that sustains WLS availability for iterative rounds of Wnt secretion.\",\n      \"evidence\": \"C. elegans genetic epistasis and immunostaining of MIG-14 in AP-2 and retromer mutants\",\n      \"pmids\": [\"18160346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian validation of the recycling circuit not yet shown\", \"Whether retromer acts directly on WLS or indirectly not resolved\", \"Sorting signals on WLS not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Finding that WLS/Evi is released in exosome-like vesicles at the Drosophila NMJ and is required for trans-synaptic Wingless signaling established a non-classical secretion route for Wnt delivery and revealed a postsynaptic cell-autonomous function for WLS.\",\n      \"evidence\": \"Live imaging, EM, and genetic loss-of-function at the Drosophila neuromuscular junction\",\n      \"pmids\": [\"19837038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of WLS sorting into MVBs not defined\", \"Whether exosomal Wnt secretion operates outside synapses not tested\", \"Postsynaptic WLS function mechanism unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Establishing that WLS binds Wnt in the ER in a Porcupine/lipidation-dependent manner and that vacuolar acidification is required for Wnt release defined the biochemical basis and directionality of the WLS–Wnt interaction along the secretory pathway.\",\n      \"evidence\": \"Small molecule screen, V-ATPase inhibition, cell fractionation, Xenopus in vivo assays\",\n      \"pmids\": [\"20826466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the lipid-dependent interaction not yet visualized\", \"pH threshold for Wnt release not quantified\", \"Whether all Wnts behave identically in this assay unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Systematic mutagenesis and co-IP across the Drosophila Wnt family confirmed that palmitoylation of a single conserved serine is the universal requirement for WLS binding, with WntD (lacking this serine) as the sole exception, generalizing the cargo-receptor mechanism to all lipid-modified Wnts.\",\n      \"evidence\": \"Site-directed mutagenesis of the conserved serine, co-immunoprecipitation, systematic Wnt knockdown/overexpression in Drosophila\",\n      \"pmids\": [\"22108505\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether WntD uses an alternative secretion receptor unknown\", \"Stoichiometry of the WLS–Wnt complex not determined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of Rab11, Myosin5, and Syntaxin1A as regulators of WLS-containing exosome release, together with conditional knockout studies demonstrating WLS requirements in limb and hair follicle development, defined the vesicular machinery for exosomal Wnt secretion and the broad developmental necessity of WLS-mediated Wnt export.\",\n      \"evidence\": \"dsRNA screen, EM, mass spectrometry at Drosophila NMJ; conditional mouse knockouts in limb mesenchyme/ectoderm and hair follicle epidermis\",\n      \"pmids\": [\"22437826\", \"22377357\", \"23029304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Rab11/Myo5 pathway is conserved in mammalian Wnt secretion unknown\", \"Relative contribution of exosomal vs. conventional secretion not quantified in vivo\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Epidermal WLS knockout causing hair loss, barrier defects, and immune dysregulation demonstrated that WLS-dependent Wnt secretion is essential for adult skin homeostasis and immune cell maintenance, extending its role beyond developmental patterning.\",\n      \"evidence\": \"Conditional knockout mouse (K14-Cre), immunohistochemistry, immune cell profiling\",\n      \"pmids\": [\"23918954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific Wnts mediate each phenotype not resolved\", \"Whether immune phenotype is cell-autonomous or secondary to barrier disruption not fully delineated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovery that WLS undergoes ERAD via UBE2J2/CGRRF1 ubiquitination and VCP-dependent extraction when Wnt ligands are absent, with PORCN/VCP forming a triaging complex, revealed how WLS protein levels are coupled to Wnt ligand availability.\",\n      \"evidence\": \"siRNA screen, co-immunoprecipitation, ubiquitination assays, proteasome inhibition, genetic epistasis in human cells\",\n      \"pmids\": [\"29378775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the PORCN/VCP triaging decision unknown\", \"Whether ERAD regulation of WLS is tissue-specific not tested\", \"Deubiquitinase(s) that might counteract WLS degradation not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The 3.2 Å cryo-EM structure of the WNT8A–WLS complex resolved the molecular basis of Wnt recognition: a GPCR-like WLS fold cradles a Wnt lipid hairpin in a hydrophobic cavity with the palmitoleate protruding into the bilayer, answering the long-standing question of how WLS accommodates lipid-modified Wnts.\",\n      \"evidence\": \"Cryo-EM structure determination of human WNT8A–WLS complex with biochemical validation\",\n      \"pmids\": [\"33357447\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the GPCR-like fold retains any signaling capacity unknown\", \"Mechanism of pH-dependent Wnt release not structurally resolved\", \"Conformational dynamics during Wnt handoff to Frizzled not captured\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural mechanism by which acidification triggers Wnt release from WLS, the relative contributions of exosomal versus conventional secretory routes in different tissues, and whether the GPCR-like domain of WLS possesses any intrinsic signaling activity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of WLS alone or at different pH states\", \"Quantitative in vivo dissection of exosomal vs. conventional Wnt secretion lacking\", \"Potential signaling function of WLS GPCR-like domain untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [0, 3, 4, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 7]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 4, 6, 8]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2, 5]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [10, 11, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"WNT8A\",\n      \"WNT3A\",\n      \"PORCN\",\n      \"VCP\",\n      \"UBE2J2\",\n      \"CGRRF1\",\n      \"TMEM132A\",\n      \"RAB11\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"WLS (Wntless/Evi/GPR177) is a multi-pass transmembrane cargo receptor that is essential in Wnt-producing cells for the secretion of all lipid-modified Wnt ligands across metazoans [PMID:16678096, PMID:16678095, PMID:22784633]. Cryo-EM reveals that WLS adopts a GPCR-like seven-transmembrane fold harboring a hydrophobic cavity into which a palmitoylated Wnt hairpin inserts, with the palmitoleate moiety extending into the bilayer; binding requires Porcupine-dependent lipidation of a conserved Wnt serine, and low endosomal pH facilitates Wnt release [PMID:33357447, PMID:20826466, PMID:22108505]. The intracellular WLS pool is maintained by retromer-mediated recycling from endosomes to the trans-Golgi network and AP-2-dependent endocytosis from the plasma membrane, while in the absence of Wnt cargo WLS is cleared by ERAD through UBE2J2/CGRRF1-mediated ubiquitination and VCP-dependent extraction [PMID:18160348, PMID:18160346, PMID:29378775]. WLS-loaded vesicles released as exosomes at Drosophila synapses—dependent on Rab11, Myosin5, and Syntaxin 1A—enable trans-synaptic Wnt transmission, and tissue-specific Wls deletion in mice disrupts limb patterning, hair follicle development, and skin immune homeostasis [PMID:19837038, PMID:22437826, PMID:22377357, PMID:23918954].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Two independent groups simultaneously identified Wntless/Evi as the first gene specifically required in Wnt-producing cells for Wnt ligand secretion, answering whether a dedicated transmembrane factor exists upstream of Wnt release.\",\n      \"evidence\": \"RNAi screens, clonal analysis and genetic epistasis in Drosophila, C. elegans, and human cells\",\n      \"pmids\": [\"16678096\", \"16678095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Wnt-WLS binding unknown\", \"Unclear whether WLS acts on all Wnt family members\", \"Trafficking route of WLS itself not determined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"The intracellular itinerary of WLS was defined: AP-2-mediated endocytosis retrieves WLS from the plasma membrane, and the retromer complex recycles it from endosomes to the TGN, solving how the cell sustains the WLS pool needed for continuous Wnt export.\",\n      \"evidence\": \"Co-IP of Wls with Vps35, fluorescence localization of MIG-14/Wls in retromer and AP-2 mutants in C. elegans and Drosophila\",\n      \"pmids\": [\"18160348\", \"18160346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sorting signals on WLS for retromer and AP-2 recognition not mapped\", \"Whether additional trafficking machinery participates remains untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that WLS-containing exosome-like vesicles mediate trans-synaptic Wingless delivery at the Drosophila NMJ answered how a lipidated Wnt traverses the synaptic cleft and revealed an unexpected postsynaptic role for Evi in targeting dGRIP.\",\n      \"evidence\": \"Immunoelectron microscopy of MVBs at synaptic boutons, genetic rescue of pre- and postsynaptic Evi function\",\n      \"pmids\": [\"19837038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether exosomal WLS-Wnt delivery operates in mammalian synapses is unknown\", \"Postsynaptic mechanism of Evi action beyond dGRIP localization is unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Establishing that Porcupine-dependent palmitoylation of a conserved Wnt serine is a prerequisite for WLS binding, and that low luminal pH triggers Wnt release, defined the biochemical basis of cargo recognition and unloading.\",\n      \"evidence\": \"Ser209 mutagenesis of WNT3A, co-IP with WLS, V-ATPase inhibition causing WNT3A-WLS accumulation at PM, Xenopus CE assay\",\n      \"pmids\": [\"20826466\", \"22108505\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for lipid-dependent recognition not yet resolved at this point\", \"pH-sensing residues in WLS not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Systematic analysis of all 19 human Wnts confirmed WLS as a universal secretion factor, while exosome release was shown to depend on Rab11, Myosin5, and Syntaxin 1A, answering both the generality and machinery questions for WLS-mediated Wnt export.\",\n      \"evidence\": \"Gateway library of 19 Wnts with WLS/PORCN knockdown; dsRNA screen, EM, and mass spectrometry of Evi exosomes at Drosophila NMJ\",\n      \"pmids\": [\"22784633\", \"22437826\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether exosomal versus direct secretion pathways are differentially used for specific Wnts is unknown\", \"Stoichiometry of Wnt loading per exosome not determined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Conditional Wls knockouts in mouse limb mesenchyme, ectoderm, and epidermis demonstrated that WLS-dependent Wnt secretion is essential for limb outgrowth, hair follicle induction, skin barrier integrity, and immune cell homeostasis, establishing broad in vivo requirements.\",\n      \"evidence\": \"Cre-lox conditional Wls deletion in multiple tissue compartments with histological and immunological phenotyping\",\n      \"pmids\": [\"22377357\", \"23918954\", \"23029304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific Wnt ligands mediate each tissue phenotype is incompletely resolved\", \"Compensatory mechanisms in surviving tissue not characterized\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstration that Wnt/β-catenin signaling in APC-mutant colorectal cancer cells still depends on Evi/WLS-mediated Wnt ligand secretion challenged the assumption that downstream pathway mutations render autocrine Wnt secretion irrelevant, identifying WLS as a potential therapeutic vulnerability.\",\n      \"evidence\": \"Evi/WLS knockdown in colon cancer cells carrying APC mutations with β-catenin reporter readout\",\n      \"pmids\": [\"24162018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo therapeutic efficacy of WLS inhibition in APC-mutant tumors untested\", \"Which specific Wnt ligands sustain autocrine signaling not fully defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of the ERAD pathway (UBE2J2 as E2, CGRRF1 as E3, VCP/p97 as extractase) that degrades unloaded WLS answered how the cell tunes WLS abundance to match Wnt production demand, with PORCN acting as a triage factor.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, proteasome inhibitor experiments, siRNA epistasis in mammalian cells\",\n      \"pmids\": [\"29378775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitination sites on WLS not mapped\", \"Whether additional E3 ligases contribute is unclear\", \"Structural basis for PORCN-mediated triage not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The 3.2 Å cryo-EM structure of palmitoleated WNT8A bound to WLS revealed the molecular architecture: WLS adopts a GPCR-like seven-TM fold and captures the Wnt palmitoleate via a hydrophobic cavity, providing the first atomic-resolution view of the cargo receptor mechanism.\",\n      \"evidence\": \"Cryo-electron microscopy of the human WNT8A–WLS complex with mutagenesis validation\",\n      \"pmids\": [\"33357447\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of WLS in its apo or endosomal-pH state\", \"Conformational changes during Wnt release not captured experimentally\", \"Whether the second Wnt hairpin conformational switch occurs in all Wnts is unverified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis for pH-triggered Wnt dissociation from WLS, the identity of sorting signals recognized by retromer and AP-2 on WLS, whether exosomal versus direct secretory routes are differentially utilized for specific Wnt family members, and the in vivo therapeutic potential of targeting WLS in Wnt-dependent cancers.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No apo-WLS or low-pH WLS structure available\", \"Sorting signals on WLS cytoplasmic domains not mapped\", \"In vivo efficacy of WLS-targeted cancer therapy not demonstrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [0, 1, 5, 6, 16]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [5, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [5, 15]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 8, 12, 16]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 3, 4, 7]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [2, 3, 15]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 13, 14]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"VPS35\",\n      \"UBE2J2\",\n      \"CGRRF1\",\n      \"VCP\",\n      \"PORCN\",\n      \"TMEM132A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}