{"gene":"PRICKLE3","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2020,"finding":"PRICKLE3 directly interacts with ATP synthase via ATP8 subunit, and the p.Arg53Trp variant causes defective assembly, stability, and function of ATP synthase in mitochondria; Prickle3-knockout mice exhibit ATPase deficiencies and LHON-like retinal phenotypes including retinal ganglion cell degeneration.","method":"Co-immunoprecipitation, PRICKLE3-knockdown cells, Prickle3-knockout mouse model with retinal phenotyping","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying ATP8 as binding partner, knockdown and knockout models with defined cellular phenotypes, replicated in both cell lines and mice","pmids":["32516135"],"is_preprint":false},{"year":2016,"finding":"Prickle3 forms a complex with Vangl2 and this complex polarizes to anterior cell edges in Xenopus ectoderm; Wnt5a, Wnt11, and Wnt11b (but not Wnt3a) orient Prickle3/Vangl2 complexes away from their sources, establishing instructive Wnt ligand control of PCP.","method":"Live imaging of fluorescent protein fusions in Xenopus embryos, Wnt antagonist treatments, ectopic Wnt source experiments, Wnt11b depletion","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (live imaging, gain-of-function, loss-of-function) in a single rigorous study establishing the Prickle3/Vangl2 complex and its regulation by specific Wnt ligands","pmids":["27658614"],"is_preprint":false},{"year":2015,"finding":"Vangl2/Prickle3 protein complexes are enriched at the apical domain of intercalating multiciliated cells and are essential for multiciliated cell intercalatory behavior during Xenopus gastrulation and neurulation; KIF13B motor protein binds Dishevelled and acts synergistically with Vangl2 for MCC intercalation, suggesting microtubule-dependent trafficking of PCP proteins.","method":"Loss-of-function (morpholino knockdown) with imaging, epistasis analysis, Co-IP of KIF13B with Dishevelled","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional knockdown with defined cellular phenotype and partial mechanistic follow-up (KIF13B Co-IP), single lab","pmids":["26079437"],"is_preprint":false},{"year":2016,"finding":"Prickle3 is enriched at the basal body of GRP cells but is recruited by Vangl2 to anterior cell borders; loss of Prickle3 disrupts anterior Vangl2 polarization and posterior cilia localization, and impairs cilia growth by preventing γ-tubulin and Nedd1 association with the basal body; Wtip physically associates with Prickle3 and cooperates with it to regulate ciliogenesis.","method":"Morpholino knockdown, immunofluorescence localization, Co-IP of Prickle3 with Wtip in Xenopus embryos","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular phenotype, direct Co-IP for Wtip interaction, subcellular localization experiments, single lab","pmids":["27062996"],"is_preprint":false},{"year":2018,"finding":"Par3 physically associates with Prickle3, promotes its apical localization, and is required for asymmetric distribution of PCP junctional complexes in the Xenopus neural plate; overexpression of a Prickle3-binding Par3 fragment disrupts PCP, placing Par3 upstream of Prickle3 apical localization.","method":"Co-immunoprecipitation, proximity biotinylation assay in Xenopus embryos, overexpression of dominant-negative Par3 fragment, imaging of PCP complex distribution","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, proximity biotinylation, dominant-negative rescue, and live imaging, multiple orthogonal methods in a single rigorous study","pmids":["30256191"],"is_preprint":false},{"year":2021,"finding":"Frizzled3 inhibits Vangl2-Prickle3 association in vivo through Fz3-dependent Vangl2 phosphorylation; non-phosphorylatable Vangl2 forms a stable complex with Pk3 that fails to polarize in the neural plate, demonstrating phosphorylation-dependent regulation of Vangl2-Pk3 complex formation.","method":"Proximity biotinylation and crosslinking in Xenopus embryos, phosphomutant analysis, genetic epistasis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — proximity biotinylation plus crosslinking plus phosphomutant rescue in a single study with multiple orthogonal approaches","pmids":["34806749"],"is_preprint":false},{"year":2025,"finding":"PRICKLE3 localizes at the plasma membrane and associates with VANGL1 and VANGL2; it selectively enhances VANGL1/2 stability by protecting them from CK1ε-mediated phosphorylation and by negatively regulating the CK1ε–RNF43 interaction, thereby reducing RNF43-mediated ubiquitination and degradation of VANGL proteins; this activity is specific to PRICKLE3 and not shared by PRICKLE1.","method":"Enhanced proximity biotinylation (miniTurboID) with mass spectrometry, immunoblotting, live imaging, functional ciliogenesis/PCP assays in human cells, Xenopus and zebrafish embryos","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — proximity biotinylation/MS interactome plus immunoblotting plus live imaging plus in vivo models, multiple orthogonal methods with isoform-specificity controls","pmids":["41455754"],"is_preprint":false},{"year":2025,"finding":"PRICKLE3 interacts with USP9X and DVL2; the PRICKLE3-DVL2 interaction enhances β-catenin phosphorylation at serine 675 promoting nuclear translocation, and PRICKLE3 recruits USP9X to inhibit DVL2 ubiquitination, thereby stabilizing DVL2 and activating canonical WNT signaling in non-small cell lung cancer cells.","method":"Co-immunoprecipitation, PRICKLE3 overexpression and knockout cell lines, in vivo tumor growth assays, ubiquitination assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying USP9X and DVL2 interactions, ubiquitination assay, in vivo tumor models, single lab","pmids":["40973792"],"is_preprint":false},{"year":2023,"finding":"iPSC-derived RGC-like cells from individuals carrying both m.11778G>A and PRICKLE3 p.Arg53Trp mutations display greater defects in RGC morphology, electrophysiology, ATP content, and apoptosis than cells carrying either mutation alone, confirming synergistic mitochondrial dysfunction downstream of PRICKLE3 mutation in human retinal neurons.","method":"iPSC differentiation to RGC-like cells, electrophysiology, ATP assay, apoptosis assay","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human iPSC model with multiple functional readouts, single lab, corroborates earlier mouse knockout data","pmids":["35947995"],"is_preprint":false},{"year":2021,"finding":"PCP (as marked by Vangl2 and Prickle3 asymmetry) in the Xenopus neural plate is progressively acquired and requires a planar signal from the dorsal blastopore lip, not a preexisting molecular gradient; tissue transplantation established a cue distinct from neural inducers.","method":"Tissue transplantation, live imaging of Vangl2 and Prickle3 in Xenopus neural plate","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue transplantation epistasis with direct imaging readout, single lab","pmids":["34259326"],"is_preprint":false},{"year":2025,"finding":"PRICKLE3 is enriched at the plasma membrane and forms complexes with VANGL proteins as determined by miniTurboID proximity biotinylation; neither PRICKLE3 nor PRICKLE1 influenced levels or phosphorylation of DVL2/DVL3, a negative result contradicting prior overexpression-based claims.","method":"Enhanced proximity biotinylation (miniTurboID) with mass spectrometry, inducible expression system, immunoblotting","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity biotinylation/MS in a preprint, physiological expression levels, but not yet peer-reviewed","pmids":["bio_10.1101_2025.03.24.644882"],"is_preprint":true},{"year":2026,"finding":"SPEM2 interacts with VANGL2, PRICKLE3, and DVL3 in spermatids; SPEM2 deficiency disrupts cell polarity-dependent spermiation, implicating PRICKLE3 as a component of the polarity machinery in male germ cells.","method":"Co-immunoprecipitation of SPEM2 with VANGL2, PRICKLE3, and DVL3; Spem2-knockout mouse model with sperm phenotyping","journal":"Biology of reproduction","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP identifying PRICKLE3 as binding partner of SPEM2, mechanistic role of PRICKLE3 itself not directly tested","pmids":["42028965"],"is_preprint":false},{"year":1997,"finding":"The LMO6 locus (PRICKLE3) was identified and mapped to human Xp11.23, confirmed to be transcribed by RT-PCR and Northern blot, and predicted to encode a LIM-domain-containing protein; a CpG island was identified at its 5' end.","method":"Genomic sequencing, RT-PCR, Northern blot, CpG island analysis","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct experimental confirmation of transcription and chromosomal mapping, replicated in subsequent work","pmids":["9344658"],"is_preprint":false}],"current_model":"PRICKLE3 is a PET/LIM-domain protein that localizes to the plasma membrane where it forms complexes with VANGL1/2, protects VANGL proteins from CK1ε-mediated phosphorylation and RNF43-mediated degradation to stabilize them at the cell surface, interacts with Par3 to achieve apical PCP complex localization, and has its association with Vangl2 negatively regulated by Frizzled3-dependent Vangl2 phosphorylation; in addition, PRICKLE3 resides in mitochondria where it interacts with ATP synthase subunit ATP8 to support ATPase biogenesis, and in cancer cells it promotes canonical WNT signaling by recruiting USP9X to deubiquitinate and stabilize DVL2."},"narrative":{"mechanistic_narrative":"PRICKLE3 is a LIM-domain protein and core component of the planar cell polarity (PCP) machinery that controls the asymmetric distribution of polarity complexes during vertebrate morphogenesis [PMID:27658614, PMID:9344658]. It forms membrane-localized complexes with VANGL1/2 that polarize to anterior cell edges in response to instructive Wnt5a/Wnt11 ligands, orienting away from Wnt sources [PMID:27658614], and it stabilizes VANGL proteins at the cell surface by protecting them from CK1ε-mediated phosphorylation and antagonizing the CK1ε–RNF43 interaction to limit RNF43-dependent ubiquitination and degradation—an activity specific to PRICKLE3 and not PRICKLE1 [PMID:41455754]. Apical localization of PRICKLE3 is established by physical association with Par3 [PMID:30256191], while Frizzled3-dependent phosphorylation of Vangl2 negatively regulates Vangl2–PRICKLE3 complex formation and is required for proper polarization [PMID:34806749]. Through these complexes PRICKLE3 drives multiciliated cell intercalation and ciliogenesis, including recruitment of γ-tubulin and Nedd1 to the basal body in cooperation with Wtip [PMID:26079437, PMID:27062996]. Independently of its PCP role, PRICKLE3 localizes to mitochondria where it binds the ATP synthase subunit ATP8 to support ATP synthase assembly and function; the p.Arg53Trp variant impairs this and produces LHON-like retinal ganglion cell degeneration [PMID:32516135, PMID:35947995]. In non-small cell lung cancer cells, PRICKLE3 recruits USP9X to deubiquitinate and stabilize DVL2, promoting canonical WNT/β-catenin signaling [PMID:40973792].","teleology":[{"year":1997,"claim":"Before any function was known, the gene had to be defined as a real transcribed locus encoding a LIM-domain protein, establishing the molecular entity for later study.","evidence":"Genomic sequencing, RT-PCR, Northern blot and CpG island analysis mapping LMO6/PRICKLE3 to Xp11.23","pmids":["9344658"],"confidence":"Medium","gaps":["No functional or biochemical role assigned","Protein-level expression and localization not addressed"]},{"year":2015,"claim":"Established that Vangl2/Prickle3 complexes operate in epithelial cell behavior, linking the protein to multiciliated cell intercalation during gastrulation and neurulation.","evidence":"Morpholino knockdown with imaging, epistasis, and KIF13B–Dishevelled Co-IP in Xenopus","pmids":["26079437"],"confidence":"Medium","gaps":["Direct biochemical PRICKLE3–VANGL2 interaction not resolved here","Trafficking mechanism inferred rather than demonstrated"]},{"year":2016,"claim":"Defined the instructive logic of PCP by showing specific Wnt ligands orient Prickle3/Vangl2 complexes, and identified Wtip as a cooperating partner directing basal-body ciliogenesis.","evidence":"Live imaging of fluorescent fusions, Wnt gain/loss-of-function in Xenopus, and Prickle3–Wtip Co-IP","pmids":["27658614","27062996"],"confidence":"High","gaps":["Receptor-level mechanism of Wnt-directed polarization not defined","How Prickle3 recruits γ-tubulin/Nedd1 biochemically unresolved"]},{"year":2018,"claim":"Placed Par3 upstream of PRICKLE3, answering how the protein achieves apical positioning required for asymmetric PCP complex distribution.","evidence":"Co-IP, proximity biotinylation, and dominant-negative Par3 fragment in Xenopus neural plate","pmids":["30256191"],"confidence":"High","gaps":["Structural basis of Par3–PRICKLE3 binding unknown","Whether Par3 acts through VANGL or directly on PRICKLE3 not separated"]},{"year":2020,"claim":"Revealed a non-PCP mitochondrial role, showing PRICKLE3 binds ATP8 to support ATP synthase biogenesis and that a point mutation causes LHON-like retinal degeneration.","evidence":"Reciprocal Co-IP, knockdown cells, and Prickle3-knockout mouse with retinal phenotyping","pmids":["32516135"],"confidence":"High","gaps":["How a PCP membrane protein partitions to mitochondria unexplained","Direct effect on ATP synthase assembly intermediates not structurally resolved"]},{"year":2021,"claim":"Defined phosphoregulation of the complex, showing Frizzled3-dependent Vangl2 phosphorylation disrupts Vangl2–PRICKLE3 association needed for polarization.","evidence":"Proximity biotinylation, crosslinking, and phosphomutant rescue in Xenopus; tissue transplantation establishing a dorsal-lip planar cue","pmids":["34806749","34259326"],"confidence":"High","gaps":["Kinase acting downstream of Fz3 not identified","Molecular nature of the dorsal-lip planar signal unknown"]},{"year":2022,"claim":"Confirmed in human retinal neurons that PRICKLE3 mutation synergizes with mtDNA mutation to cause mitochondrial dysfunction, validating the disease mechanism in patient-derived cells.","evidence":"iPSC-derived RGC-like cells with electrophysiology, ATP and apoptosis assays","pmids":["35947995"],"confidence":"Medium","gaps":["Mechanism of synergy with m.11778G>A not dissected","Single-lab human cell model"]},{"year":2025,"claim":"Established the biochemical mechanism by which PRICKLE3 stabilizes VANGL at the surface—blocking CK1ε phosphorylation and the CK1ε–RNF43 axis—with isoform specificity over PRICKLE1.","evidence":"miniTurboID/MS interactome, immunoblotting, live imaging, and in vivo PCP/ciliogenesis assays across human cells, Xenopus and zebrafish","pmids":["41455754"],"confidence":"High","gaps":["Structural basis for PRICKLE3 vs PRICKLE1 specificity not defined","Whether this activity intersects the mitochondrial role unknown"]},{"year":2025,"claim":"Proposed a cancer-promoting branch in which PRICKLE3 recruits USP9X to stabilize DVL2 and activate canonical WNT signaling, though an independent interactome found no effect of PRICKLE3 on DVL2 levels.","evidence":"Co-IP, knockout/overexpression cell lines, ubiquitination and tumor growth assays (Oncogene); contradicted by miniTurboID/MS at physiological expression (bioRxiv preprint)","pmids":["40973792","bio_10.1101_2025.03.24.644882"],"confidence":"Medium","gaps":["Conflicting evidence on whether PRICKLE3 regulates DVL2 stability","Overexpression-based effects not reconciled with physiological-level data"]},{"year":2026,"claim":"Extended the polarity role to male germ cells, placing PRICKLE3 in a SPEM2–VANGL2–DVL3 complex required for spermiation.","evidence":"Co-IP of SPEM2 with PRICKLE3/VANGL2/DVL3 and Spem2-knockout mouse sperm phenotyping","pmids":["42028965"],"confidence":"Low","gaps":["Mechanistic role of PRICKLE3 itself not directly tested","Single Co-IP without reciprocal validation of PRICKLE3 function"]},{"year":null,"claim":"It remains unresolved how PRICKLE3 is dually targeted to the plasma membrane PCP machinery and to mitochondria, and whether its canonical WNT/DVL2-stabilizing activity is genuine given conflicting interactome data.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mechanism for dual membrane/mitochondrial localization","DVL2 regulation contradicted between studies","No structural model of VANGL- or ATP8-binding interfaces"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,1]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6,10]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,8]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,6]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,4]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0]}],"complexes":["VANGL1/2-PRICKLE3 PCP complex","ATP synthase"],"partners":["VANGL2","VANGL1","ATP8","PAR3","WTIP","USP9X","DVL2","SPEM2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O43900","full_name":"Prickle planar cell polarity protein 3","aliases":["LIM domain only protein 6","LMO-6","Prickle-like protein 3","Pk3","Triple LIM domain protein 6"],"length_aa":615,"mass_kda":68.6,"function":"Involved in the planar cell polarity (PCP) pathway that is essential for the polarization of epithelial cells during morphogenetic processes, including gastrulation and neurulation (By similarity). PCP is maintained by two molecular modules, the global and the core modules, PRICKLE3 being part of the core module (By similarity). Distinct complexes of the core module segregate to opposite sides of the cell, where they interact with the opposite complex in the neighboring cell at or near the adherents junctions (By similarity). Involved in the organization of the basal body (By similarity). Involved in cilia growth and positioning (By similarity). Required for proper assembly, stability, and function of mitochondrial membrane ATP synthase (mitochondrial complex V) (PubMed:32516135)","subcellular_location":"Cytoplasm; Cell membrane; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/O43900/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PRICKLE3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PRICKLE3","total_profiled":1310},"omim":[{"mim_id":"535000","title":"LEBER OPTIC ATROPHY","url":"https://www.omim.org/entry/535000"},{"mim_id":"516003","title":"COMPLEX I, SUBUNIT ND4; MTND4","url":"https://www.omim.org/entry/516003"},{"mim_id":"308905","title":"LEBER HEREDITARY OPTIC NEUROPATHY, MODIFIER OF; LOAM","url":"https://www.omim.org/entry/308905"},{"mim_id":"300111","title":"PRICKLE PLANAR CELL POLARITY PROTEIN 3; PRICKLE3","url":"https://www.omim.org/entry/300111"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PRICKLE3"},"hgnc":{"alias_symbol":[],"prev_symbol":["LMO6"]},"alphafold":{"accession":"O43900","domains":[{"cath_id":"2.10.110.10","chopping":"93-249","consensus_level":"high","plddt":92.7936,"start":93,"end":249},{"cath_id":"2.10.110.10","chopping":"309-368","consensus_level":"medium","plddt":92.1128,"start":309,"end":368}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43900","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43900-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43900-F1-predicted_aligned_error_v6.png","plddt_mean":67.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PRICKLE3","jax_strain_url":"https://www.jax.org/strain/search?query=PRICKLE3"},"sequence":{"accession":"O43900","fasta_url":"https://rest.uniprot.org/uniprotkb/O43900.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43900/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43900"}},"corpus_meta":[{"pmid":"12525887","id":"PMC_12525887","title":"Identification and characterization of human PRICKLE1 and PRICKLE2 genes as well as mouse Prickle1 and Prickle2 genes homologous to Drosophila tissue polarity gene prickle.","date":"2003","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/12525887","citation_count":159,"is_preprint":false},{"pmid":"27658614","id":"PMC_27658614","title":"Wnt proteins can direct planar cell polarity in vertebrate ectoderm.","date":"2016","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/27658614","citation_count":63,"is_preprint":false},{"pmid":"32516135","id":"PMC_32516135","title":"PRICKLE3 linked to ATPase biogenesis manifested Leber's hereditary optic neuropathy.","date":"2020","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/32516135","citation_count":57,"is_preprint":false},{"pmid":"26079437","id":"PMC_26079437","title":"The involvement of PCP proteins in radial cell intercalations during Xenopus embryonic 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Yi xue ban = Journal of Zhejiang University. Medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/42260285","citation_count":0,"is_preprint":false},{"pmid":"42028965","id":"PMC_42028965","title":"SPEM2 deficiency disrupts spermiation leading to oligoasthenoteratozoospermia and male infertility†.","date":"2026","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/42028965","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.03.24.644882","title":"Armed with PRICKLE(3)s: Stabilizing WNT/PCP complexes against RNF43-mediated ubiquitination","date":"2025-03-25","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.24.644882","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13435,"output_tokens":3313,"usd":0.045,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10830,"output_tokens":3671,"usd":0.072962,"stage2_stop_reason":"end_turn"},"total_usd":0.117962,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2020,\n      \"finding\": \"PRICKLE3 directly interacts with ATP synthase via ATP8 subunit, and the p.Arg53Trp variant causes defective assembly, stability, and function of ATP synthase in mitochondria; Prickle3-knockout mice exhibit ATPase deficiencies and LHON-like retinal phenotypes including retinal ganglion cell degeneration.\",\n      \"method\": \"Co-immunoprecipitation, PRICKLE3-knockdown cells, Prickle3-knockout mouse model with retinal phenotyping\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying ATP8 as binding partner, knockdown and knockout models with defined cellular phenotypes, replicated in both cell lines and mice\",\n      \"pmids\": [\"32516135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Prickle3 forms a complex with Vangl2 and this complex polarizes to anterior cell edges in Xenopus ectoderm; Wnt5a, Wnt11, and Wnt11b (but not Wnt3a) orient Prickle3/Vangl2 complexes away from their sources, establishing instructive Wnt ligand control of PCP.\",\n      \"method\": \"Live imaging of fluorescent protein fusions in Xenopus embryos, Wnt antagonist treatments, ectopic Wnt source experiments, Wnt11b depletion\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (live imaging, gain-of-function, loss-of-function) in a single rigorous study establishing the Prickle3/Vangl2 complex and its regulation by specific Wnt ligands\",\n      \"pmids\": [\"27658614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Vangl2/Prickle3 protein complexes are enriched at the apical domain of intercalating multiciliated cells and are essential for multiciliated cell intercalatory behavior during Xenopus gastrulation and neurulation; KIF13B motor protein binds Dishevelled and acts synergistically with Vangl2 for MCC intercalation, suggesting microtubule-dependent trafficking of PCP proteins.\",\n      \"method\": \"Loss-of-function (morpholino knockdown) with imaging, epistasis analysis, Co-IP of KIF13B with Dishevelled\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional knockdown with defined cellular phenotype and partial mechanistic follow-up (KIF13B Co-IP), single lab\",\n      \"pmids\": [\"26079437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Prickle3 is enriched at the basal body of GRP cells but is recruited by Vangl2 to anterior cell borders; loss of Prickle3 disrupts anterior Vangl2 polarization and posterior cilia localization, and impairs cilia growth by preventing γ-tubulin and Nedd1 association with the basal body; Wtip physically associates with Prickle3 and cooperates with it to regulate ciliogenesis.\",\n      \"method\": \"Morpholino knockdown, immunofluorescence localization, Co-IP of Prickle3 with Wtip in Xenopus embryos\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular phenotype, direct Co-IP for Wtip interaction, subcellular localization experiments, single lab\",\n      \"pmids\": [\"27062996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Par3 physically associates with Prickle3, promotes its apical localization, and is required for asymmetric distribution of PCP junctional complexes in the Xenopus neural plate; overexpression of a Prickle3-binding Par3 fragment disrupts PCP, placing Par3 upstream of Prickle3 apical localization.\",\n      \"method\": \"Co-immunoprecipitation, proximity biotinylation assay in Xenopus embryos, overexpression of dominant-negative Par3 fragment, imaging of PCP complex distribution\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, proximity biotinylation, dominant-negative rescue, and live imaging, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"30256191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Frizzled3 inhibits Vangl2-Prickle3 association in vivo through Fz3-dependent Vangl2 phosphorylation; non-phosphorylatable Vangl2 forms a stable complex with Pk3 that fails to polarize in the neural plate, demonstrating phosphorylation-dependent regulation of Vangl2-Pk3 complex formation.\",\n      \"method\": \"Proximity biotinylation and crosslinking in Xenopus embryos, phosphomutant analysis, genetic epistasis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proximity biotinylation plus crosslinking plus phosphomutant rescue in a single study with multiple orthogonal approaches\",\n      \"pmids\": [\"34806749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRICKLE3 localizes at the plasma membrane and associates with VANGL1 and VANGL2; it selectively enhances VANGL1/2 stability by protecting them from CK1ε-mediated phosphorylation and by negatively regulating the CK1ε–RNF43 interaction, thereby reducing RNF43-mediated ubiquitination and degradation of VANGL proteins; this activity is specific to PRICKLE3 and not shared by PRICKLE1.\",\n      \"method\": \"Enhanced proximity biotinylation (miniTurboID) with mass spectrometry, immunoblotting, live imaging, functional ciliogenesis/PCP assays in human cells, Xenopus and zebrafish embryos\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — proximity biotinylation/MS interactome plus immunoblotting plus live imaging plus in vivo models, multiple orthogonal methods with isoform-specificity controls\",\n      \"pmids\": [\"41455754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRICKLE3 interacts with USP9X and DVL2; the PRICKLE3-DVL2 interaction enhances β-catenin phosphorylation at serine 675 promoting nuclear translocation, and PRICKLE3 recruits USP9X to inhibit DVL2 ubiquitination, thereby stabilizing DVL2 and activating canonical WNT signaling in non-small cell lung cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, PRICKLE3 overexpression and knockout cell lines, in vivo tumor growth assays, ubiquitination assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying USP9X and DVL2 interactions, ubiquitination assay, in vivo tumor models, single lab\",\n      \"pmids\": [\"40973792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"iPSC-derived RGC-like cells from individuals carrying both m.11778G>A and PRICKLE3 p.Arg53Trp mutations display greater defects in RGC morphology, electrophysiology, ATP content, and apoptosis than cells carrying either mutation alone, confirming synergistic mitochondrial dysfunction downstream of PRICKLE3 mutation in human retinal neurons.\",\n      \"method\": \"iPSC differentiation to RGC-like cells, electrophysiology, ATP assay, apoptosis assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human iPSC model with multiple functional readouts, single lab, corroborates earlier mouse knockout data\",\n      \"pmids\": [\"35947995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PCP (as marked by Vangl2 and Prickle3 asymmetry) in the Xenopus neural plate is progressively acquired and requires a planar signal from the dorsal blastopore lip, not a preexisting molecular gradient; tissue transplantation established a cue distinct from neural inducers.\",\n      \"method\": \"Tissue transplantation, live imaging of Vangl2 and Prickle3 in Xenopus neural plate\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue transplantation epistasis with direct imaging readout, single lab\",\n      \"pmids\": [\"34259326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRICKLE3 is enriched at the plasma membrane and forms complexes with VANGL proteins as determined by miniTurboID proximity biotinylation; neither PRICKLE3 nor PRICKLE1 influenced levels or phosphorylation of DVL2/DVL3, a negative result contradicting prior overexpression-based claims.\",\n      \"method\": \"Enhanced proximity biotinylation (miniTurboID) with mass spectrometry, inducible expression system, immunoblotting\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity biotinylation/MS in a preprint, physiological expression levels, but not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.03.24.644882\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"SPEM2 interacts with VANGL2, PRICKLE3, and DVL3 in spermatids; SPEM2 deficiency disrupts cell polarity-dependent spermiation, implicating PRICKLE3 as a component of the polarity machinery in male germ cells.\",\n      \"method\": \"Co-immunoprecipitation of SPEM2 with VANGL2, PRICKLE3, and DVL3; Spem2-knockout mouse model with sperm phenotyping\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP identifying PRICKLE3 as binding partner of SPEM2, mechanistic role of PRICKLE3 itself not directly tested\",\n      \"pmids\": [\"42028965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The LMO6 locus (PRICKLE3) was identified and mapped to human Xp11.23, confirmed to be transcribed by RT-PCR and Northern blot, and predicted to encode a LIM-domain-containing protein; a CpG island was identified at its 5' end.\",\n      \"method\": \"Genomic sequencing, RT-PCR, Northern blot, CpG island analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct experimental confirmation of transcription and chromosomal mapping, replicated in subsequent work\",\n      \"pmids\": [\"9344658\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PRICKLE3 is a PET/LIM-domain protein that localizes to the plasma membrane where it forms complexes with VANGL1/2, protects VANGL proteins from CK1ε-mediated phosphorylation and RNF43-mediated degradation to stabilize them at the cell surface, interacts with Par3 to achieve apical PCP complex localization, and has its association with Vangl2 negatively regulated by Frizzled3-dependent Vangl2 phosphorylation; in addition, PRICKLE3 resides in mitochondria where it interacts with ATP synthase subunit ATP8 to support ATPase biogenesis, and in cancer cells it promotes canonical WNT signaling by recruiting USP9X to deubiquitinate and stabilize DVL2.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PRICKLE3 is a LIM-domain protein and core component of the planar cell polarity (PCP) machinery that controls the asymmetric distribution of polarity complexes during vertebrate morphogenesis [#1, #12]. It forms membrane-localized complexes with VANGL1/2 that polarize to anterior cell edges in response to instructive Wnt5a/Wnt11 ligands, orienting away from Wnt sources [#1], and it stabilizes VANGL proteins at the cell surface by protecting them from CK1\\u03b5-mediated phosphorylation and antagonizing the CK1\\u03b5\\u2013RNF43 interaction to limit RNF43-dependent ubiquitination and degradation\\u2014an activity specific to PRICKLE3 and not PRICKLE1 [#6]. Apical localization of PRICKLE3 is established by physical association with Par3 [#4], while Frizzled3-dependent phosphorylation of Vangl2 negatively regulates Vangl2\\u2013PRICKLE3 complex formation and is required for proper polarization [#5]. Through these complexes PRICKLE3 drives multiciliated cell intercalation and ciliogenesis, including recruitment of \\u03b3-tubulin and Nedd1 to the basal body in cooperation with Wtip [#2, #3]. Independently of its PCP role, PRICKLE3 localizes to mitochondria where it binds the ATP synthase subunit ATP8 to support ATP synthase assembly and function; the p.Arg53Trp variant impairs this and produces LHON-like retinal ganglion cell degeneration [#0, #8]. In non-small cell lung cancer cells, PRICKLE3 recruits USP9X to deubiquitinate and stabilize DVL2, promoting canonical WNT/\\u03b2-catenin signaling [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Before any function was known, the gene had to be defined as a real transcribed locus encoding a LIM-domain protein, establishing the molecular entity for later study.\",\n      \"evidence\": \"Genomic sequencing, RT-PCR, Northern blot and CpG island analysis mapping LMO6/PRICKLE3 to Xp11.23\",\n      \"pmids\": [\"9344658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional or biochemical role assigned\", \"Protein-level expression and localization not addressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established that Vangl2/Prickle3 complexes operate in epithelial cell behavior, linking the protein to multiciliated cell intercalation during gastrulation and neurulation.\",\n      \"evidence\": \"Morpholino knockdown with imaging, epistasis, and KIF13B\\u2013Dishevelled Co-IP in Xenopus\",\n      \"pmids\": [\"26079437\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical PRICKLE3\\u2013VANGL2 interaction not resolved here\", \"Trafficking mechanism inferred rather than demonstrated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the instructive logic of PCP by showing specific Wnt ligands orient Prickle3/Vangl2 complexes, and identified Wtip as a cooperating partner directing basal-body ciliogenesis.\",\n      \"evidence\": \"Live imaging of fluorescent fusions, Wnt gain/loss-of-function in Xenopus, and Prickle3\\u2013Wtip Co-IP\",\n      \"pmids\": [\"27658614\", \"27062996\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor-level mechanism of Wnt-directed polarization not defined\", \"How Prickle3 recruits \\u03b3-tubulin/Nedd1 biochemically unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed Par3 upstream of PRICKLE3, answering how the protein achieves apical positioning required for asymmetric PCP complex distribution.\",\n      \"evidence\": \"Co-IP, proximity biotinylation, and dominant-negative Par3 fragment in Xenopus neural plate\",\n      \"pmids\": [\"30256191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Par3\\u2013PRICKLE3 binding unknown\", \"Whether Par3 acts through VANGL or directly on PRICKLE3 not separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed a non-PCP mitochondrial role, showing PRICKLE3 binds ATP8 to support ATP synthase biogenesis and that a point mutation causes LHON-like retinal degeneration.\",\n      \"evidence\": \"Reciprocal Co-IP, knockdown cells, and Prickle3-knockout mouse with retinal phenotyping\",\n      \"pmids\": [\"32516135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a PCP membrane protein partitions to mitochondria unexplained\", \"Direct effect on ATP synthase assembly intermediates not structurally resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined phosphoregulation of the complex, showing Frizzled3-dependent Vangl2 phosphorylation disrupts Vangl2\\u2013PRICKLE3 association needed for polarization.\",\n      \"evidence\": \"Proximity biotinylation, crosslinking, and phosphomutant rescue in Xenopus; tissue transplantation establishing a dorsal-lip planar cue\",\n      \"pmids\": [\"34806749\", \"34259326\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase acting downstream of Fz3 not identified\", \"Molecular nature of the dorsal-lip planar signal unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Confirmed in human retinal neurons that PRICKLE3 mutation synergizes with mtDNA mutation to cause mitochondrial dysfunction, validating the disease mechanism in patient-derived cells.\",\n      \"evidence\": \"iPSC-derived RGC-like cells with electrophysiology, ATP and apoptosis assays\",\n      \"pmids\": [\"35947995\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of synergy with m.11778G>A not dissected\", \"Single-lab human cell model\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established the biochemical mechanism by which PRICKLE3 stabilizes VANGL at the surface\\u2014blocking CK1\\u03b5 phosphorylation and the CK1\\u03b5\\u2013RNF43 axis\\u2014with isoform specificity over PRICKLE1.\",\n      \"evidence\": \"miniTurboID/MS interactome, immunoblotting, live imaging, and in vivo PCP/ciliogenesis assays across human cells, Xenopus and zebrafish\",\n      \"pmids\": [\"41455754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for PRICKLE3 vs PRICKLE1 specificity not defined\", \"Whether this activity intersects the mitochondrial role unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proposed a cancer-promoting branch in which PRICKLE3 recruits USP9X to stabilize DVL2 and activate canonical WNT signaling, though an independent interactome found no effect of PRICKLE3 on DVL2 levels.\",\n      \"evidence\": \"Co-IP, knockout/overexpression cell lines, ubiquitination and tumor growth assays (Oncogene); contradicted by miniTurboID/MS at physiological expression (bioRxiv preprint)\",\n      \"pmids\": [\"40973792\", \"bio_10.1101_2025.03.24.644882\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conflicting evidence on whether PRICKLE3 regulates DVL2 stability\", \"Overexpression-based effects not reconciled with physiological-level data\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extended the polarity role to male germ cells, placing PRICKLE3 in a SPEM2\\u2013VANGL2\\u2013DVL3 complex required for spermiation.\",\n      \"evidence\": \"Co-IP of SPEM2 with PRICKLE3/VANGL2/DVL3 and Spem2-knockout mouse sperm phenotyping\",\n      \"pmids\": [\"42028965\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Mechanistic role of PRICKLE3 itself not directly tested\", \"Single Co-IP without reciprocal validation of PRICKLE3 function\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how PRICKLE3 is dually targeted to the plasma membrane PCP machinery and to mitochondria, and whether its canonical WNT/DVL2-stabilizing activity is genuine given conflicting interactome data.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mechanism for dual membrane/mitochondrial localization\", \"DVL2 regulation contradicted between studies\", \"No structural model of VANGL- or ATP8-binding interfaces\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 10]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 4]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"VANGL1/2-PRICKLE3 PCP complex\", \"ATP synthase\"],\n    \"partners\": [\"VANGL2\", \"VANGL1\", \"ATP8\", \"Par3\", \"Wtip\", \"USP9X\", \"DVL2\", \"SPEM2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}