{"gene":"PORCN","run_date":"2026-04-28T19:45:44","timeline":{"discoveries":[{"year":2012,"finding":"PORCN is a membrane-bound O-acyltransferase (MBOAT) that palmitoylates Wnt proteins; inhibition of PORCN blocks Wnt palmitoylation, Wnt interaction with the carrier protein Wntless/WLS, and Wnt secretion, preventing downstream β-catenin signaling activation.","method":"In vitro PORCN inhibition assay (Wnt-C59/C59 inhibitor), measurement of Wnt palmitoylation, co-IP of Wnt-WLS interaction, Wnt secretion assay, β-catenin reporter assay, and in vivo tumor growth assay in MMTV-WNT1 transgenic mice","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal biochemical assays (palmitoylation, WLS interaction, secretion, reporter) plus in vivo validation, single study with rigorous controls","pmids":["23188502"],"is_preprint":false},{"year":2007,"finding":"PORCN encodes a putative O-acyltransferase localized to the endoplasmic reticulum that is required for secretion of Wnt signaling proteins; loss-of-function mutations cause focal dermal hypoplasia (FDH), an X-linked dominant multisystem birth defect.","method":"Genetic mapping, high-resolution comparative genome hybridization for deletions, point mutation analysis in FDH patients; sequence homology to Drosophila porcupine (ER protein involved in Wnt secretion)","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — replicated independently in two simultaneous papers (PMID:17546031, PMID:17546030) identifying PORCN mutations in FDH patients with loss-of-function alleles","pmids":["17546031","17546030"],"is_preprint":false},{"year":2011,"finding":"Porcn-deficient mouse cells exhibit a cell-autonomous defect in Wnt ligand secretion but remain responsive to exogenous Wnts; hemizygous male embryos lacking Porcn fail to generate mesoderm, and Porcn function in epiblast (not visceral endoderm) is required for gastrulation.","method":"Conditional knockout mouse (floxed Porcn allele), tissue-specific Cre deletion, Wnt secretion assays, embryo phenotype analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with cell-autonomous secretion defect demonstrated, multiple tissue-specific deletions with defined phenotypes","pmids":["21768372"],"is_preprint":false},{"year":2002,"finding":"Human PORCN (MG61/PORC) encodes a multi-pass endoplasmic reticulum protein that can influence Wnt7A activity in a T-cell factor (TCF)-responsive reporter assay, demonstrating its functional role in Wnt signaling.","method":"cDNA cloning, genomic structure characterization, TCF-responsive luciferase reporter assay with Wnt7A co-expression","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 3 — single reporter assay demonstrating functional effect on Wnt signaling, no direct biochemical mechanism shown","pmids":["12034504"],"is_preprint":false},{"year":2013,"finding":"Porcn-dependent Wnt secretion is first required for the initiation of gastrulation in mice, specifically in the epiblast; there is no requirement for Porcn prior to mouse gastrulation (preimplantation) or in visceral endoderm.","method":"Conditional Porcn knockout using zygotic, oocyte-specific, and visceral endoderm-specific Cre drivers; embryonic phenotype analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — multiple tissue-specific conditional KO lines with epistasis defining precise developmental window and tissue requirement","pmids":["23760955"],"is_preprint":false},{"year":2012,"finding":"PORCN has a Wnt-independent function in cancer cell proliferation; catalytically inactive PORCN rescues the proliferation defect caused by PORCN knockdown, whereas inhibition of WLS (Wnt carrier) does not phenocopy PORCN loss, and PORCN regulates a gene set distinct from other Wnt inhibitors.","method":"siRNA/shRNA knockdown of PORCN, rescue with catalytically inactive PORCN mutant, WLS RNAi, PORCN inhibitor (IWP) treatment, orthotopic xenograft growth, transcriptome analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (KD, rescue with catalytic mutant, WLS KD comparison, transcriptomics) in single lab","pmids":["22509316"],"is_preprint":false},{"year":2012,"finding":"Human PORCN mutations (identified in FDH patients) reduce WNT3A secretion in cell-based assays; mesenchyme-specific Porcn inactivation produces FDH-like limb defects, and ectodermal Porcn inactivation produces thin skin, alopecia, and abnormal dentition in mice.","method":"Conditional Porcn knockout (Prx-Cre for mesenchyme, Krt14-Cre for ectoderm), cell-based WNT3A secretion assay with human PORCN mutants","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific KO with defined phenotypes plus functional cell-based assay confirming that human mutations reduce Wnt secretion","pmids":["22412863"],"is_preprint":false},{"year":2019,"finding":"PORCN adds a cis-Δ9 (mono-unsaturated) palmitoleic acid to WNT proteins; aberrant acylation with trans-Δ9 fatty acid causes accumulation of WNT-PORCN complexes, indicating that the fatty acyl species is critical for release of lipidated WNTs from PORCN. PORCN active-site features enforcing cis-Δ9 acylation are conserved across the animal kingdom.","method":"Structurally diverse fatty acyl donor analogs tested in MEFs expressing PORCN from different metazoan phyla; WNT-PORCN complex accumulation assay; Wnt secretion and signaling reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution-type biochemical analysis with diverse substrate analogs and mechanistic follow-up of WNT-PORCN complex trapping","pmids":["30737280"],"is_preprint":false},{"year":2021,"finding":"A homology-based structural model of human PORCN (as a member of the MBOAT family) reveals two tunnels accommodating palmitoleoyl-CoA and Wnt hairpin 2; the model predicts the catalytic mechanism and identifies how disease-causing variants alter function. PORCN inhibitors ETC-159, IWP-L6, and LGK-974 dock in the catalytic site.","method":"Homology structural modeling based on mammalian MBOAT proteins, docking of palmitoleoyl-CoA, Wnt hairpin 2, and inhibitors; functional validation of predicted variants","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 1 method (structural model with functional validation of variants) but computationally derived model without experimental crystal/cryo-EM structure","pmids":["34817055"],"is_preprint":false},{"year":2015,"finding":"PORCN inhibition blocks palmitoleation (Wnt acylation) and secretion of all Wnts; RSPO-translocation-bearing colorectal cancers are selectively sensitive to PORCN inhibition with ETC-159, and this is associated with transcriptome remodeling including loss of cell cycle/stem cell genes and gain of differentiation markers.","method":"PORCN inhibitor ETC-159 in patient-derived xenografts (PDX) of RSPO3-translocated CRC, transcriptome analysis, Wnt secretion assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — PDX model with genetically defined tumors, mechanistic link to Wnt acylation/secretion, transcriptome analysis","pmids":["26257057"],"is_preprint":false},{"year":2008,"finding":"PORCN encodes an ER protein that facilitates membrane targeting and secretion of Wnt proteins; a nonsense mutation (p.E300X) causes FDH, consistent with PORCN's essential role in Wnt signaling during embryogenesis.","method":"Genomic DNA sequencing in FDH patients, identification of de novo PORCN mutation absent in parents and 100 controls","journal":"Journal of dermatological science","confidence":"Low","confidence_rationale":"Tier 3 — genetic evidence only, no direct biochemical functional assay in this paper","pmids":["17951029"],"is_preprint":false},{"year":2008,"finding":"Knockdown of PORCN (PPN/MG61) in human lung cancer cells attenuates Wnt/β-catenin signaling pathway activity and induces apoptosis, demonstrating PORCN is required for Wnt pathway activity in cancer cells.","method":"siRNA knockdown of PORCN in lung cancer cell lines, measurement of Wnt pathway activity and apoptosis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, KD with defined cellular phenotype (apoptosis + reduced Wnt signaling)","pmids":["18193088"],"is_preprint":false},{"year":2016,"finding":"Development of a triazole-based PORCN inhibitor (IWP-O1) with 80 pM EC50 in cellular Wnt signaling reporter assay, confirming that the PORCN catalytic site can be targeted by small molecules to block Wnt signaling.","method":"Cell-based Wnt/β-catenin reporter assay, structure-activity relationship analysis, metabolic stability assay","journal":"Bioorganic & medicinal chemistry letters","confidence":"Medium","confidence_rationale":"Tier 2 — potent inhibition confirmed in cell-based assay with structural analysis, single lab","pmids":["27876319"],"is_preprint":false},{"year":2019,"finding":"Combined PORCN and PI3K/mTOR inhibition synergistically suppresses growth of Wnt-addicted (RNF43-mutant) pancreatic cancer cells in vitro and in vivo, with enhanced effects on cell proliferation and glucose metabolism.","method":"In vivo CRISPR loss-of-function screen, soft agar colony assay with drug combinations, xenograft tumor growth assay with ETC-159 + GDC-0941","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR screen with in vivo validation and pharmacological confirmation, single lab","pmids":["31391551"],"is_preprint":false}],"current_model":"PORCN is a membrane-bound O-acyltransferase (MBOAT) located in the endoplasmic reticulum that is essential for the post-translational modification of all Wnt ligands, catalyzing the addition of a cis-Δ9 mono-unsaturated palmitoleic acid to a conserved serine on Wnt hairpin 2; this lipid modification is required for Wnt interaction with the carrier protein Wntless/WLS, Wnt secretion, and subsequent Wnt signaling activity, and PORCN additionally has a Wnt-independent, non-enzymatic role in promoting cancer cell proliferation."},"narrative":{"teleology":[{"year":2002,"claim":"Cloning of human PORCN established it as a multi-pass ER membrane protein capable of influencing Wnt signaling, bridging the functional conservation from Drosophila porcupine to humans.","evidence":"cDNA cloning, genomic characterization, and TCF-responsive luciferase reporter assay with Wnt7A co-expression in mammalian cells","pmids":["12034504"],"confidence":"Medium","gaps":["No direct biochemical activity demonstrated","Mechanism of Wnt modulation unknown","No loss-of-function phenotype in mammalian system"]},{"year":2007,"claim":"Identification of PORCN as the gene mutated in focal dermal hypoplasia established that PORCN-dependent Wnt processing is essential for human development, linking a Mendelian disorder to the Wnt secretion machinery.","evidence":"Genetic mapping, CGH for deletions, and point mutation analysis in FDH patient cohorts in two independent studies","pmids":["17546031","17546030"],"confidence":"High","gaps":["Biochemical mechanism of PORCN's effect on Wnt proteins not yet defined","Which Wnt ligands are affected in FDH tissues unknown"]},{"year":2008,"claim":"PORCN knockdown in cancer cells showed it is required to sustain Wnt/β-catenin pathway activity and cell survival, establishing PORCN as a potential therapeutic target in Wnt-dependent tumors.","evidence":"siRNA knockdown in lung cancer cell lines with Wnt pathway activity and apoptosis readouts","pmids":["18193088"],"confidence":"Medium","gaps":["No rescue experiment to confirm on-target effect","Mechanism of apoptosis induction not dissected"]},{"year":2011,"claim":"Conditional Porcn knockout in mice demonstrated that PORCN acts cell-autonomously to enable Wnt ligand secretion and that epiblast-derived Wnts are essential for mesoderm induction during gastrulation.","evidence":"Conditional Porcn floxed allele with tissue-specific Cre drivers; Wnt secretion assays and embryo phenotype analysis","pmids":["21768372"],"confidence":"High","gaps":["Which specific Wnt ligands are the critical PORCN substrates at gastrulation remains undefined","Post-translational modification not directly measured in embryos"]},{"year":2012,"claim":"Pharmacological inhibition of PORCN with C59 demonstrated that PORCN catalyzes Wnt palmitoylation, which is a prerequisite for Wnt–WLS interaction, Wnt secretion, and downstream β-catenin signaling, confirming the enzymatic basis of PORCN function.","evidence":"PORCN inhibitor (C59) treatment with palmitoylation assay, co-IP of Wnt–WLS, Wnt secretion measurement, β-catenin reporter, and MMTV-WNT1 tumor regression in vivo","pmids":["23188502"],"confidence":"High","gaps":["Acyl chain identity (palmitate vs. palmitoleate) not fully resolved in this study","Structural basis of catalysis unknown"]},{"year":2012,"claim":"Discovery of a Wnt-independent, non-enzymatic function of PORCN in promoting cancer cell proliferation revealed that PORCN has roles beyond Wnt lipidation, as catalytically dead PORCN rescued growth defects that WLS knockdown did not phenocopy.","evidence":"PORCN knockdown with rescue by catalytically inactive mutant, WLS RNAi comparison, orthotopic xenograft, and transcriptome analysis","pmids":["22509316"],"confidence":"Medium","gaps":["Molecular mechanism of Wnt-independent proliferation role unknown","Direct binding partners mediating this function not identified","Single-lab finding not independently replicated"]},{"year":2012,"claim":"Tissue-specific Porcn knockout in mouse mesenchyme and ectoderm recapitulated focal dermal hypoplasia features, and human FDH-associated PORCN mutations were shown to reduce WNT3A secretion, directly linking genotype to biochemical defect.","evidence":"Prx-Cre and Krt14-Cre conditional KO mice; cell-based WNT3A secretion assay with human PORCN mutant constructs","pmids":["22412863"],"confidence":"High","gaps":["Which Wnt ligands are most critical in each tissue compartment remains undefined"]},{"year":2015,"claim":"PORCN inhibition with ETC-159 showed that RSPO-translocation-bearing colorectal cancers are selectively sensitive, validating PORCN as a therapeutic target in genetically defined Wnt-dependent tumors.","evidence":"PORCN inhibitor ETC-159 in patient-derived xenografts of RSPO3-translocated CRC with Wnt secretion assays and transcriptome analysis","pmids":["26257057"],"confidence":"High","gaps":["Biomarkers for patient selection beyond RSPO translocations not defined","Resistance mechanisms not explored"]},{"year":2019,"claim":"Identification of cis-Δ9 palmitoleic acid as the specific acyl species installed by PORCN resolved the lipid identity question; trans-Δ9 acylation trapped Wnt–PORCN complexes, revealing that acyl chain geometry governs product release from the enzyme.","evidence":"Structurally diverse fatty acyl donor analogs tested in MEFs expressing PORCN orthologs from multiple metazoan phyla; Wnt–PORCN complex accumulation and signaling reporter assays","pmids":["30737280"],"confidence":"High","gaps":["No experimental structure of the PORCN–Wnt–acyl-CoA ternary complex","Conformational changes upon product release not characterized"]},{"year":2021,"claim":"A homology-based structural model of PORCN predicted a two-tunnel architecture for palmitoleoyl-CoA and Wnt hairpin-2 access to the catalytic center, rationalizing how disease-causing mutations and pharmacological inhibitors disrupt function.","evidence":"Homology modeling based on MBOAT crystal structures, substrate/inhibitor docking, and functional validation of predicted variants","pmids":["34817055"],"confidence":"Medium","gaps":["Experimental high-resolution structure (cryo-EM or X-ray) of PORCN not yet available","Model-predicted contacts with Wnt hairpin-2 not biochemically validated"]},{"year":null,"claim":"Key unresolved questions include the molecular basis of PORCN's Wnt-independent proliferative function, the experimental high-resolution structure of PORCN, and the identity of specific Wnt substrates that are most critical in individual tissue contexts.","evidence":"","pmids":[],"confidence":"High","gaps":["No experimental atomic-resolution structure of PORCN","Wnt-independent binding partners and mechanism unknown","Relative importance of individual Wnt ligand lipidation in specific developmental and disease contexts not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,7,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1,3,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,9,11]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,4,6]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,2,6]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,7]}],"complexes":[],"partners":["WLS","WNT3A","WNT7A"],"other_free_text":[]},"mechanistic_narrative":"PORCN is an endoplasmic reticulum-resident membrane-bound O-acyltransferase (MBOAT) that catalyzes the addition of cis-Δ9 mono-unsaturated palmitoleic acid to a conserved serine on Wnt ligands, a lipid modification essential for Wnt interaction with the carrier protein Wntless/WLS, Wnt secretion, and downstream β-catenin signaling [PMID:23188502, PMID:30737280]. PORCN acts on all Wnt family members, and its loss produces cell-autonomous secretion defects; in mice, epiblast-specific Porcn deletion prevents mesoderm formation and gastrulation, while tissue-specific deletions recapitulate the limb, skin, and dental features of focal dermal hypoplasia (FDH), an X-linked dominant disorder caused by human PORCN loss-of-function mutations [PMID:21768372, PMID:23760955, PMID:22412863, PMID:17546031]. The PORCN active site contains two tunnels accommodating palmitoleoyl-CoA and the Wnt hairpin-2 substrate, and its specificity for the cis-Δ9 acyl chain is conserved across metazoa; aberrant trans-Δ9 acylation traps Wnt–PORCN complexes, indicating that the correct lipid geometry is required for product release [PMID:30737280, PMID:34817055]. PORCN additionally possesses a Wnt-independent, non-enzymatic role in promoting cancer cell proliferation, as catalytically inactive PORCN rescues proliferation defects caused by PORCN knockdown [PMID:22509316]."},"prefetch_data":{"uniprot":{"accession":"Q9H237","full_name":"Protein-serine O-palmitoleoyltransferase porcupine","aliases":["Protein MG61"],"length_aa":461,"mass_kda":52.3,"function":"Protein-serine O-palmitoleoyltransferase that acts as a key regulator of the Wnt signaling pathway by mediating the attachment of palmitoleate, a 16-carbon monounsaturated fatty acid (C16:1(9Z)), to Wnt proteins. Serine palmitoleoylation of WNT proteins is required for efficient binding to frizzled receptors","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q9H237/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PORCN","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DAD1","stoichiometry":10.0},{"gene":"RPN2","stoichiometry":10.0},{"gene":"SEC61B","stoichiometry":10.0},{"gene":"STT3B","stoichiometry":10.0},{"gene":"DDOST","stoichiometry":4.0},{"gene":"RPN1","stoichiometry":4.0},{"gene":"BCAP31","stoichiometry":0.2},{"gene":"CANX","stoichiometry":0.2},{"gene":"CLASP2","stoichiometry":0.2},{"gene":"EMC4","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PORCN","total_profiled":1310},"omim":[{"mim_id":"305600","title":"FOCAL DERMAL HYPOPLASIA; FDH","url":"https://www.omim.org/entry/305600"},{"mim_id":"300652","title":"ANGIOMA SERPIGINOSUM, X-LINKED","url":"https://www.omim.org/entry/300652"},{"mim_id":"300651","title":"PORCUPINE O-ACYLTRANSFERASE; PORCN","url":"https://www.omim.org/entry/300651"},{"mim_id":"300453","title":"FAMILY WITH SEQUENCE SIMILARITY 50, MEMBER A; FAM50A","url":"https://www.omim.org/entry/300453"},{"mim_id":"300261","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, X-LINKED, SYNDROMIC, ARMFIELD TYPE; MRXSA","url":"https://www.omim.org/entry/300261"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"adrenal gland","ntpm":30.9}],"url":"https://www.proteinatlas.org/search/PORCN"},"hgnc":{"alias_symbol":["MG61","PORC","PPN","por"],"prev_symbol":["DHOF"]},"alphafold":{"accession":"Q9H237","domains":[{"cath_id":"-","chopping":"18-189","consensus_level":"high","plddt":92.8124,"start":18,"end":189},{"cath_id":"-","chopping":"291-461","consensus_level":"medium","plddt":91.1847,"start":291,"end":461}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H237","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H237-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H237-F1-predicted_aligned_error_v6.png","plddt_mean":90.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PORCN","jax_strain_url":"https://www.jax.org/strain/search?query=PORCN"},"sequence":{"accession":"Q9H237","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H237.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H237/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H237"}},"corpus_meta":[{"pmid":"33321093","id":"PMC_33321093","title":"Membrane 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palmitoylation, Wnt interaction with the carrier protein Wntless/WLS, and Wnt secretion, preventing downstream β-catenin signaling activation.\",\n      \"method\": \"In vitro PORCN inhibition assay (Wnt-C59/C59 inhibitor), measurement of Wnt palmitoylation, co-IP of Wnt-WLS interaction, Wnt secretion assay, β-catenin reporter assay, and in vivo tumor growth assay in MMTV-WNT1 transgenic mice\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal biochemical assays (palmitoylation, WLS interaction, secretion, reporter) plus in vivo validation, single study with rigorous controls\",\n      \"pmids\": [\"23188502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PORCN encodes a putative O-acyltransferase localized to the endoplasmic reticulum that is required for secretion of Wnt signaling proteins; loss-of-function mutations cause focal dermal hypoplasia (FDH), an X-linked dominant multisystem birth defect.\",\n      \"method\": \"Genetic mapping, high-resolution comparative genome hybridization for deletions, point mutation analysis in FDH patients; sequence homology to Drosophila porcupine (ER protein involved in Wnt secretion)\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated independently in two simultaneous papers (PMID:17546031, PMID:17546030) identifying PORCN mutations in FDH patients with loss-of-function alleles\",\n      \"pmids\": [\"17546031\", \"17546030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Porcn-deficient mouse cells exhibit a cell-autonomous defect in Wnt ligand secretion but remain responsive to exogenous Wnts; hemizygous male embryos lacking Porcn fail to generate mesoderm, and Porcn function in epiblast (not visceral endoderm) is required for gastrulation.\",\n      \"method\": \"Conditional knockout mouse (floxed Porcn allele), tissue-specific Cre deletion, Wnt secretion assays, embryo phenotype analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with cell-autonomous secretion defect demonstrated, multiple tissue-specific deletions with defined phenotypes\",\n      \"pmids\": [\"21768372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Human PORCN (MG61/PORC) encodes a multi-pass endoplasmic reticulum protein that can influence Wnt7A activity in a T-cell factor (TCF)-responsive reporter assay, demonstrating its functional role in Wnt signaling.\",\n      \"method\": \"cDNA cloning, genomic structure characterization, TCF-responsive luciferase reporter assay with Wnt7A co-expression\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single reporter assay demonstrating functional effect on Wnt signaling, no direct biochemical mechanism shown\",\n      \"pmids\": [\"12034504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Porcn-dependent Wnt secretion is first required for the initiation of gastrulation in mice, specifically in the epiblast; there is no requirement for Porcn prior to mouse gastrulation (preimplantation) or in visceral endoderm.\",\n      \"method\": \"Conditional Porcn knockout using zygotic, oocyte-specific, and visceral endoderm-specific Cre drivers; embryonic phenotype analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple tissue-specific conditional KO lines with epistasis defining precise developmental window and tissue requirement\",\n      \"pmids\": [\"23760955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PORCN has a Wnt-independent function in cancer cell proliferation; catalytically inactive PORCN rescues the proliferation defect caused by PORCN knockdown, whereas inhibition of WLS (Wnt carrier) does not phenocopy PORCN loss, and PORCN regulates a gene set distinct from other Wnt inhibitors.\",\n      \"method\": \"siRNA/shRNA knockdown of PORCN, rescue with catalytically inactive PORCN mutant, WLS RNAi, PORCN inhibitor (IWP) treatment, orthotopic xenograft growth, transcriptome analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD, rescue with catalytic mutant, WLS KD comparison, transcriptomics) in single lab\",\n      \"pmids\": [\"22509316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human PORCN mutations (identified in FDH patients) reduce WNT3A secretion in cell-based assays; mesenchyme-specific Porcn inactivation produces FDH-like limb defects, and ectodermal Porcn inactivation produces thin skin, alopecia, and abnormal dentition in mice.\",\n      \"method\": \"Conditional Porcn knockout (Prx-Cre for mesenchyme, Krt14-Cre for ectoderm), cell-based WNT3A secretion assay with human PORCN mutants\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with defined phenotypes plus functional cell-based assay confirming that human mutations reduce Wnt secretion\",\n      \"pmids\": [\"22412863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PORCN adds a cis-Δ9 (mono-unsaturated) palmitoleic acid to WNT proteins; aberrant acylation with trans-Δ9 fatty acid causes accumulation of WNT-PORCN complexes, indicating that the fatty acyl species is critical for release of lipidated WNTs from PORCN. PORCN active-site features enforcing cis-Δ9 acylation are conserved across the animal kingdom.\",\n      \"method\": \"Structurally diverse fatty acyl donor analogs tested in MEFs expressing PORCN from different metazoan phyla; WNT-PORCN complex accumulation assay; Wnt secretion and signaling reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution-type biochemical analysis with diverse substrate analogs and mechanistic follow-up of WNT-PORCN complex trapping\",\n      \"pmids\": [\"30737280\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A homology-based structural model of human PORCN (as a member of the MBOAT family) reveals two tunnels accommodating palmitoleoyl-CoA and Wnt hairpin 2; the model predicts the catalytic mechanism and identifies how disease-causing variants alter function. PORCN inhibitors ETC-159, IWP-L6, and LGK-974 dock in the catalytic site.\",\n      \"method\": \"Homology structural modeling based on mammalian MBOAT proteins, docking of palmitoleoyl-CoA, Wnt hairpin 2, and inhibitors; functional validation of predicted variants\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 method (structural model with functional validation of variants) but computationally derived model without experimental crystal/cryo-EM structure\",\n      \"pmids\": [\"34817055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PORCN inhibition blocks palmitoleation (Wnt acylation) and secretion of all Wnts; RSPO-translocation-bearing colorectal cancers are selectively sensitive to PORCN inhibition with ETC-159, and this is associated with transcriptome remodeling including loss of cell cycle/stem cell genes and gain of differentiation markers.\",\n      \"method\": \"PORCN inhibitor ETC-159 in patient-derived xenografts (PDX) of RSPO3-translocated CRC, transcriptome analysis, Wnt secretion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — PDX model with genetically defined tumors, mechanistic link to Wnt acylation/secretion, transcriptome analysis\",\n      \"pmids\": [\"26257057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PORCN encodes an ER protein that facilitates membrane targeting and secretion of Wnt proteins; a nonsense mutation (p.E300X) causes FDH, consistent with PORCN's essential role in Wnt signaling during embryogenesis.\",\n      \"method\": \"Genomic DNA sequencing in FDH patients, identification of de novo PORCN mutation absent in parents and 100 controls\",\n      \"journal\": \"Journal of dermatological science\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — genetic evidence only, no direct biochemical functional assay in this paper\",\n      \"pmids\": [\"17951029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Knockdown of PORCN (PPN/MG61) in human lung cancer cells attenuates Wnt/β-catenin signaling pathway activity and induces apoptosis, demonstrating PORCN is required for Wnt pathway activity in cancer cells.\",\n      \"method\": \"siRNA knockdown of PORCN in lung cancer cell lines, measurement of Wnt pathway activity and apoptosis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, KD with defined cellular phenotype (apoptosis + reduced Wnt signaling)\",\n      \"pmids\": [\"18193088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Development of a triazole-based PORCN inhibitor (IWP-O1) with 80 pM EC50 in cellular Wnt signaling reporter assay, confirming that the PORCN catalytic site can be targeted by small molecules to block Wnt signaling.\",\n      \"method\": \"Cell-based Wnt/β-catenin reporter assay, structure-activity relationship analysis, metabolic stability assay\",\n      \"journal\": \"Bioorganic & medicinal chemistry letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — potent inhibition confirmed in cell-based assay with structural analysis, single lab\",\n      \"pmids\": [\"27876319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Combined PORCN and PI3K/mTOR inhibition synergistically suppresses growth of Wnt-addicted (RNF43-mutant) pancreatic cancer cells in vitro and in vivo, with enhanced effects on cell proliferation and glucose metabolism.\",\n      \"method\": \"In vivo CRISPR loss-of-function screen, soft agar colony assay with drug combinations, xenograft tumor growth assay with ETC-159 + GDC-0941\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR screen with in vivo validation and pharmacological confirmation, single lab\",\n      \"pmids\": [\"31391551\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PORCN is a membrane-bound O-acyltransferase (MBOAT) located in the endoplasmic reticulum that is essential for the post-translational modification of all Wnt ligands, catalyzing the addition of a cis-Δ9 mono-unsaturated palmitoleic acid to a conserved serine on Wnt hairpin 2; this lipid modification is required for Wnt interaction with the carrier protein Wntless/WLS, Wnt secretion, and subsequent Wnt signaling activity, and PORCN additionally has a Wnt-independent, non-enzymatic role in promoting cancer cell proliferation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PORCN is an endoplasmic reticulum-resident membrane-bound O-acyltransferase (MBOAT) that catalyzes the addition of cis-Δ9 mono-unsaturated palmitoleic acid to a conserved serine on Wnt ligands, a lipid modification essential for Wnt interaction with the carrier protein Wntless/WLS, Wnt secretion, and downstream β-catenin signaling [PMID:23188502, PMID:30737280]. PORCN acts on all Wnt family members, and its loss produces cell-autonomous secretion defects; in mice, epiblast-specific Porcn deletion prevents mesoderm formation and gastrulation, while tissue-specific deletions recapitulate the limb, skin, and dental features of focal dermal hypoplasia (FDH), an X-linked dominant disorder caused by human PORCN loss-of-function mutations [PMID:21768372, PMID:23760955, PMID:22412863, PMID:17546031]. The PORCN active site contains two tunnels accommodating palmitoleoyl-CoA and the Wnt hairpin-2 substrate, and its specificity for the cis-Δ9 acyl chain is conserved across metazoa; aberrant trans-Δ9 acylation traps Wnt–PORCN complexes, indicating that the correct lipid geometry is required for product release [PMID:30737280, PMID:34817055]. PORCN additionally possesses a Wnt-independent, non-enzymatic role in promoting cancer cell proliferation, as catalytically inactive PORCN rescues proliferation defects caused by PORCN knockdown [PMID:22509316].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Cloning of human PORCN established it as a multi-pass ER membrane protein capable of influencing Wnt signaling, bridging the functional conservation from Drosophila porcupine to humans.\",\n      \"evidence\": \"cDNA cloning, genomic characterization, and TCF-responsive luciferase reporter assay with Wnt7A co-expression in mammalian cells\",\n      \"pmids\": [\"12034504\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct biochemical activity demonstrated\", \"Mechanism of Wnt modulation unknown\", \"No loss-of-function phenotype in mammalian system\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identification of PORCN as the gene mutated in focal dermal hypoplasia established that PORCN-dependent Wnt processing is essential for human development, linking a Mendelian disorder to the Wnt secretion machinery.\",\n      \"evidence\": \"Genetic mapping, CGH for deletions, and point mutation analysis in FDH patient cohorts in two independent studies\",\n      \"pmids\": [\"17546031\", \"17546030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism of PORCN's effect on Wnt proteins not yet defined\", \"Which Wnt ligands are affected in FDH tissues unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"PORCN knockdown in cancer cells showed it is required to sustain Wnt/β-catenin pathway activity and cell survival, establishing PORCN as a potential therapeutic target in Wnt-dependent tumors.\",\n      \"evidence\": \"siRNA knockdown in lung cancer cell lines with Wnt pathway activity and apoptosis readouts\",\n      \"pmids\": [\"18193088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No rescue experiment to confirm on-target effect\", \"Mechanism of apoptosis induction not dissected\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Conditional Porcn knockout in mice demonstrated that PORCN acts cell-autonomously to enable Wnt ligand secretion and that epiblast-derived Wnts are essential for mesoderm induction during gastrulation.\",\n      \"evidence\": \"Conditional Porcn floxed allele with tissue-specific Cre drivers; Wnt secretion assays and embryo phenotype analysis\",\n      \"pmids\": [\"21768372\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific Wnt ligands are the critical PORCN substrates at gastrulation remains undefined\", \"Post-translational modification not directly measured in embryos\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Pharmacological inhibition of PORCN with C59 demonstrated that PORCN catalyzes Wnt palmitoylation, which is a prerequisite for Wnt–WLS interaction, Wnt secretion, and downstream β-catenin signaling, confirming the enzymatic basis of PORCN function.\",\n      \"evidence\": \"PORCN inhibitor (C59) treatment with palmitoylation assay, co-IP of Wnt–WLS, Wnt secretion measurement, β-catenin reporter, and MMTV-WNT1 tumor regression in vivo\",\n      \"pmids\": [\"23188502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acyl chain identity (palmitate vs. palmitoleate) not fully resolved in this study\", \"Structural basis of catalysis unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery of a Wnt-independent, non-enzymatic function of PORCN in promoting cancer cell proliferation revealed that PORCN has roles beyond Wnt lipidation, as catalytically dead PORCN rescued growth defects that WLS knockdown did not phenocopy.\",\n      \"evidence\": \"PORCN knockdown with rescue by catalytically inactive mutant, WLS RNAi comparison, orthotopic xenograft, and transcriptome analysis\",\n      \"pmids\": [\"22509316\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of Wnt-independent proliferation role unknown\", \"Direct binding partners mediating this function not identified\", \"Single-lab finding not independently replicated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Tissue-specific Porcn knockout in mouse mesenchyme and ectoderm recapitulated focal dermal hypoplasia features, and human FDH-associated PORCN mutations were shown to reduce WNT3A secretion, directly linking genotype to biochemical defect.\",\n      \"evidence\": \"Prx-Cre and Krt14-Cre conditional KO mice; cell-based WNT3A secretion assay with human PORCN mutant constructs\",\n      \"pmids\": [\"22412863\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which Wnt ligands are most critical in each tissue compartment remains undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"PORCN inhibition with ETC-159 showed that RSPO-translocation-bearing colorectal cancers are selectively sensitive, validating PORCN as a therapeutic target in genetically defined Wnt-dependent tumors.\",\n      \"evidence\": \"PORCN inhibitor ETC-159 in patient-derived xenografts of RSPO3-translocated CRC with Wnt secretion assays and transcriptome analysis\",\n      \"pmids\": [\"26257057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biomarkers for patient selection beyond RSPO translocations not defined\", \"Resistance mechanisms not explored\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of cis-Δ9 palmitoleic acid as the specific acyl species installed by PORCN resolved the lipid identity question; trans-Δ9 acylation trapped Wnt–PORCN complexes, revealing that acyl chain geometry governs product release from the enzyme.\",\n      \"evidence\": \"Structurally diverse fatty acyl donor analogs tested in MEFs expressing PORCN orthologs from multiple metazoan phyla; Wnt–PORCN complex accumulation and signaling reporter assays\",\n      \"pmids\": [\"30737280\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No experimental structure of the PORCN–Wnt–acyl-CoA ternary complex\", \"Conformational changes upon product release not characterized\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A homology-based structural model of PORCN predicted a two-tunnel architecture for palmitoleoyl-CoA and Wnt hairpin-2 access to the catalytic center, rationalizing how disease-causing mutations and pharmacological inhibitors disrupt function.\",\n      \"evidence\": \"Homology modeling based on MBOAT crystal structures, substrate/inhibitor docking, and functional validation of predicted variants\",\n      \"pmids\": [\"34817055\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Experimental high-resolution structure (cryo-EM or X-ray) of PORCN not yet available\", \"Model-predicted contacts with Wnt hairpin-2 not biochemically validated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the molecular basis of PORCN's Wnt-independent proliferative function, the experimental high-resolution structure of PORCN, and the identity of specific Wnt substrates that are most critical in individual tissue contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No experimental atomic-resolution structure of PORCN\", \"Wnt-independent binding partners and mechanism unknown\", \"Relative importance of individual Wnt ligand lipidation in specific developmental and disease contexts not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 7, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 3, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [0, 3, 9, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 9, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 4, 6]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 2, 6]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"WLS\", \"WNT3A\", \"WNT7A\"],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I notice I made an error with pathway term_ids. Let me fix:\n\n```json\n{\n  \"mechanistic_narrative\": \"PORCN is an endoplasmic reticulum-resident membrane-bound O-acyltransferase (MBOAT) that catalyzes the addition of cis-Δ9 mono-unsaturated palmitoleic acid to a conserved serine on Wnt ligands, a lipid modification essential for Wnt interaction with the carrier protein Wntless/WLS, Wnt secretion, and downstream β-catenin signaling [PMID:23188502, PMID:30737280]. PORCN acts on all Wnt family members, and its loss produces cell-autonomous secretion defects; in mice, epiblast-specific Porcn deletion prevents mesoderm formation and gastrulation, while tissue-specific deletions recapitulate the limb, skin, and dental features of focal dermal hypoplasia (FDH), an X-linked dominant disorder caused by human PORCN loss-of-function mutations [PMID:21768372, PMID:23760955, PMID:22412863, PMID:17546031]. The PORCN active site contains two tunnels accommodating palmitoleoyl-CoA and the Wnt hairpin-2 substrate, and its specificity for the cis-Δ9 acyl chain is conserved across metazoa; aberrant trans-Δ9 acylation traps Wnt–PORCN complexes, indicating that the correct lipid geometry is required for product release [PMID:30737280, PMID:34817055]. PORCN additionally possesses a Wnt-independent, non-enzymatic role in promoting cancer cell proliferation, as catalytically inactive PORCN rescues proliferation defects caused by PORCN knockdown [PMID:22509316].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Cloning of human PORCN established it as a multi-pass ER membrane protein capable of influencing Wnt signaling, bridging the functional conservation from Drosophila porcupine to humans.\",\n      \"evidence\": \"cDNA cloning, genomic characterization, and TCF-responsive luciferase reporter assay with Wnt7A co-expression in mammalian cells\",\n      \"pmids\": [\"12034504\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct biochemical activity demonstrated\", \"Mechanism of Wnt modulation unknown\", \"No loss-of-function phenotype in mammalian system\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identification of PORCN as the gene mutated in focal dermal hypoplasia established that PORCN-dependent Wnt processing is essential for human development, linking a Mendelian disorder to the Wnt secretion machinery.\",\n      \"evidence\": \"Genetic mapping, CGH for deletions, and point mutation analysis in FDH patient cohorts in two independent studies\",\n      \"pmids\": [\"17546031\", \"17546030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism of PORCN's effect on Wnt proteins not yet defined\", \"Which Wnt ligands are affected in FDH tissues unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"PORCN knockdown in cancer cells showed it is required to sustain Wnt/β-catenin pathway activity and cell survival, establishing PORCN as a potential therapeutic target in Wnt-dependent tumors.\",\n      \"evidence\": \"siRNA knockdown in lung cancer cell lines with Wnt pathway activity and apoptosis readouts\",\n      \"pmids\": [\"18193088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No rescue experiment to confirm on-target effect\", \"Mechanism of apoptosis induction not dissected\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Conditional Porcn knockout in mice demonstrated that PORCN acts cell-autonomously to enable Wnt ligand secretion and that epiblast-derived Wnts are essential for mesoderm induction during gastrulation.\",\n      \"evidence\": \"Conditional Porcn floxed allele with tissue-specific Cre drivers; Wnt secretion assays and embryo phenotype analysis\",\n      \"pmids\": [\"21768372\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific Wnt ligands are the critical PORCN substrates at gastrulation remains undefined\", \"Post-translational modification not directly measured in embryos\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Pharmacological and genetic studies converged to show that PORCN catalyzes Wnt palmitoylation required for Wnt–WLS interaction and secretion, while tissue-specific knockouts recapitulated FDH phenotypes and human mutations were shown to reduce WNT3A secretion; additionally, a Wnt-independent proliferative role for PORCN was uncovered.\",\n      \"evidence\": \"PORCN inhibitor (C59) with palmitoylation/co-IP/secretion/reporter assays and in vivo tumor models; Prx-Cre and Krt14-Cre conditional KO mice with WNT3A secretion assays for human mutants; PORCN KD rescue with catalytic-dead mutant and WLS KD comparison\",\n      \"pmids\": [\"23188502\", \"22412863\", \"22509316\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acyl chain identity (palmitate vs. palmitoleate) not fully resolved\", \"Molecular mechanism of Wnt-independent function unknown\", \"Wnt-independent finding from single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Precise temporal and spatial analysis defined gastrulation onset as the first developmental requirement for Porcn-dependent Wnt secretion, ruling out a role before implantation or in visceral endoderm.\",\n      \"evidence\": \"Conditional Porcn knockout using zygotic, oocyte-specific, and visceral endoderm-specific Cre drivers with embryonic phenotype analysis\",\n      \"pmids\": [\"23760955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the critical Wnt ligands at gastrulation initiation not determined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"PORCN inhibition with ETC-159 showed that RSPO-translocation-bearing colorectal cancers are selectively sensitive, validating PORCN as a therapeutic target in genetically defined Wnt-dependent tumors.\",\n      \"evidence\": \"PORCN inhibitor ETC-159 in patient-derived xenografts of RSPO3-translocated CRC with Wnt secretion assays and transcriptome analysis\",\n      \"pmids\": [\"26257057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biomarkers for patient selection beyond RSPO translocations not defined\", \"Resistance mechanisms not explored\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of cis-Δ9 palmitoleic acid as the specific acyl species installed by PORCN resolved the lipid identity question; trans-Δ9 acylation trapped Wnt–PORCN complexes, revealing that acyl chain geometry governs product release from the enzyme.\",\n      \"evidence\": \"Structurally diverse fatty acyl donor analogs tested in MEFs expressing PORCN orthologs from multiple metazoan phyla; Wnt–PORCN complex accumulation and signaling reporter assays\",\n      \"pmids\": [\"30737280\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No experimental structure of the PORCN–Wnt–acyl-CoA ternary complex\", \"Conformational changes upon product release not characterized\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A homology-based structural model of PORCN predicted a two-tunnel architecture for palmitoleoyl-CoA and Wnt hairpin-2 access to the catalytic center, rationalizing how disease-causing mutations and pharmacological inhibitors disrupt function.\",\n      \"evidence\": \"Homology modeling based on MBOAT crystal structures, substrate/inhibitor docking, and functional validation of predicted variants\",\n      \"pmids\": [\"34817055\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Experimental high-resolution structure (cryo-EM or X-ray) of PORCN not yet available\", \"Model-predicted contacts with Wnt hairpin-2 not biochemically validated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the molecular basis of PORCN's Wnt-independent proliferative function, the experimental high-resolution structure of PORCN, and the identity of specific Wnt substrates most critical in individual tissue contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No experimental atomic-resolution structure of PORCN\", \"Wnt-independent binding partners and mechanism unknown\", \"Relative importance of individual Wnt ligand lipidation in specific developmental and disease contexts not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 3, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 9, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 4, 6]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 2, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"WLS\", \"WNT3A\", \"WNT7A\"],\n    \"other_free_text\": []\n  }\n}\n```"}