{"gene":"VPS13B","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2003,"finding":"COH1/VPS13B encodes a putative transmembrane protein of 4,022 amino acids with homology to Saccharomyces cerevisiae VPS13, suggesting a role in vesicle-mediated sorting and intracellular protein transport.","method":"Sequence analysis, homology to yeast Vps13, gene characterization","journal":"American journal of human genetics","confidence":"Low","confidence_rationale":"Tier 4 — computational/homology prediction, no direct functional assay","pmids":["12730828"],"is_preprint":false},{"year":2011,"finding":"COH1/VPS13B is a peripheral Golgi membrane protein that co-localizes with the cis-Golgi matrix protein GM130; RNAi-mediated depletion causes fragmentation of the Golgi ribbon into ministacks, and Golgi fragmentation is also observed in fibroblasts from Cohen syndrome patients.","method":"Immunofluorescence co-localization, RNAi knockdown, patient fibroblast analysis, subcellular fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (localization, RNAi KD with defined cellular phenotype, patient cells), replicated in patient fibroblasts","pmids":["21865173"],"is_preprint":false},{"year":2014,"finding":"COH1/VPS13B physically interacts with the active GTP-bound form of RAB6 at the Golgi complex; RAB6A/A' knockdown prevents COH1 Golgi localization, constitutively inactive RAB6_T27N increases solubilization of COH1 from membranes, and co-IP confirms preferential interaction with constitutively active RAB6_Q72L. COH1 depletion in primary neurons impairs neurite outgrowth, linking Golgi integrity to axonal outgrowth.","method":"Co-immunoprecipitation, RNAi knockdown, dominant-negative/constitutively active RAB6 mutants, membrane solubilization assay, primary neuron morphology assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with multiple RAB6 mutants, RNAi with defined cellular phenotypes in neurons, multiple orthogonal methods in one study","pmids":["25492866"],"is_preprint":false},{"year":2019,"finding":"Vps13b mutant mice (exon 2 deletion) display motor deficits (reduced open field activity, shorter rotarod latency) and spatial learning deficits (Morris water maze), recapitulating intellectual disability and hypotonia features of Cohen syndrome.","method":"Mouse knockout model, behavioral testing (open field, rotarod, Morris water maze)","journal":"Experimental neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined behavioral phenotypes, single study","pmids":["31495077"],"is_preprint":false},{"year":2020,"finding":"VPS13B loss (patient iPSC-derived neurons and CRISPR KO HeLa cells) leads to accumulation of autophagic vacuoles at axonal terminals and upregulation of autophagic flux; transcriptomic analysis reveals dysregulation of autophagosome organization genes including upregulation of ATG4C.","method":"iPSC-derived neurons from Cohen syndrome patients, CRISPR/Cas9 VPS13B KO HeLa cells, autophagic flux assays, transcriptomic analysis","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 — multiple cell models (patient iPSC neurons + KO cell line) with orthogonal readouts, single lab","pmids":["32375900"],"is_preprint":false},{"year":2020,"finding":"In a Vps13b knockout mouse model, VPS13B participates in lens homeostasis; loss of VPS13B leads to cataract formation associated with large vacuoles in the cortical lens area, epithelial-mesenchymal transition, and fibrosis.","method":"Vps13b knockout mouse (Vps13b∆Ex3/∆Ex3), ophthalmoscopy, slit-lamp examination, histology, immunohistochemistry, western blot","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 — KO mouse with defined cellular phenotype and multiple readouts, single study","pmids":["32915983"],"is_preprint":false},{"year":2023,"finding":"Vps13b is differentially expressed across brain regions with highest expression in cerebellum, hippocampus, and cortex with postnatal peak; Vps13b-/- mice display microcephaly, growth delay, hypotonia, altered memory, and enhanced sociability. Specific neuroanatomical changes include reduction in dentate gyrus size and thinning of motor cortex layer VI, with increased neuronal death during infantile stages but no progression in adulthood.","method":"Vps13b knockout mouse model, 2D and 3D brain histo-morphological analyses, behavioral testing, expression profiling across brain regions","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2 — comprehensive KO mouse characterization with multiple orthogonal methods, single lab","pmids":["37573958"],"is_preprint":false},{"year":2023,"finding":"VPS13B localizes at the interface between proximal and distal Golgi subcompartments (cis-trans interface); VPS13B KO cells show delayed Golgi complex reformation after Brefeldin A-induced disruption. VPS13B physically interacts with FAM177A1, a Golgi protein whose loss phenocopies VPS13B KO delay. In zebrafish, vps13b genetically interacts with fam177a1.","method":"Super-resolution microscopy, BFA-washout Golgi reformation assay, co-IP/interaction studies, zebrafish genetic interaction","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — super-resolution localization, functional KO assay, genetic epistasis in zebrafish, and biochemical interaction in one study","pmids":["39331042"],"is_preprint":false},{"year":2024,"finding":"VPS13B is recruited to ER exit site (ERES)-Golgi interfaces by the adaptor protein Sec23IP via direct interaction through the VPS13 adaptor binding (VAB) domain. This interaction promotes ERES-Golgi association. Disease-associated missense mutations in VPS13B-VAB impair Sec23IP binding. Loss of VPS13B or Sec23IP blocks formation of tubular ERGIC (an unconventional ER-to-Golgi cargo carrier) and delays ER export of procollagen, linking VPS13B function to joint laxity in Cohen syndrome patients.","method":"Co-IP, direct interaction mapping, VAB domain mutagenesis, ERGIC tubule formation assay, procollagen secretion assay, KO cell lines","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — direct binding domain identified with mutagenesis, multiple functional assays (tubular ERGIC, procollagen secretion), disease mutations tested","pmids":["39352497"],"is_preprint":false},{"year":2023,"finding":"VPS13B localizes to and promotes formation of Golgi-lipid droplet membrane contact sites (MCSs) upon oleic acid stimulation; depletion of VPS13B moderately reduces Golgi-LD contact formation in addition to causing Golgi fragmentation.","method":"3D high-resolution microscopy, oleic acid stimulation, VPS13B depletion","journal":"Contact (Thousand Oaks)","confidence":"Low","confidence_rationale":"Tier 3 — single study, microscopy-based localization with partial functional follow-up","pmids":["38090145"],"is_preprint":false},{"year":2025,"finding":"VPS13B localizes to Mitofusin 2-positive mitochondria via its C-terminal region and recruits phosphatidylinositol-4-phosphate (PI4P)-rich Golgi vesicles to mitochondrial fission sites. Loss of VPS13B (including in Cohen syndrome patient-derived neurons) causes abnormally elongated/fused mitochondria with reduced membrane potential and impaired mitophagy. Loss of VPS13B or depletion of PI4P results in incomplete mitochondrial fission despite normal DRP1 recruitment, indicating VPS13B-mediated lipid transfer is required for membrane fission.","method":"Live-cell imaging, mitochondrial morphology assays, membrane potential measurements, mitophagy assays, PI4P depletion, DRP1 recruitment assay, patient iPSC-derived neurons, C-terminal domain localization mapping","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (lipid transfer, domain mapping, patient neurons, DRP1 epistasis), strong mechanistic model in single study","pmids":["41402289"],"is_preprint":false},{"year":2021,"finding":"A VPS13B missense variant (c.710G>C, p.Arg237Pro) shows diminished localization at the Golgi complex by immunofluorescence, establishing that Golgi targeting is functionally relevant for VPS13B and that specific missense mutations disrupt this localization.","method":"Functional characterization of missense variant, immunofluorescence Golgi localization assay","journal":"Frontiers in neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional localization assay with disease-associated missense variant, single study","pmids":["39723426"],"is_preprint":false},{"year":2026,"finding":"VPS13B regulates intracellular trafficking of the tight junction protein coxsackievirus and adenovirus receptor (CXADR) in gingival epithelial cells; VPS13B knockout causes decreased cell-surface CXADR and increased lysosomal CXADR degradation (bafilomycin A1 rescue), leading to increased epithelial permeability to LPS and PGN. The C-terminus of CXADR (not JAM1) is required for VPS13B-dependent trafficking.","method":"VPS13B KO cell lines, surface localization assay, bafilomycin A1 treatment, chimeric CXADR-JAM1 construct, epithelial permeability assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — KO with multiple functional readouts, domain-swap experiment, single study","pmids":["41730960"],"is_preprint":false}],"current_model":"VPS13B/COH1 is a large peripheral membrane protein that functions at multiple membrane interfaces: it localizes to the cis-trans Golgi interface (recruited via Sec23IP at ERES-Golgi contacts through its VAB domain), acts as a RAB6 effector for Golgi structural maintenance, transfers phosphatidylinositol-4-phosphate-rich lipids from Golgi vesicles to mitochondrial fission sites to drive DRP1-independent membrane scission, and regulates intracellular trafficking of specific cargo (e.g., CXADR, procollagen); loss of VPS13B causes Golgi fragmentation, defective tubular ERGIC formation, impaired ER-to-Golgi transport, elongated/fused mitochondria with impaired mitophagy, upregulated autophagy, and defective neurite outgrowth—collectively explaining the pleiotropic features of Cohen syndrome."},"narrative":{"teleology":[{"year":2003,"claim":"Identification of VPS13B/COH1 as the gene mutated in Cohen syndrome established its disease relevance but left its cellular function unknown beyond homology to yeast vacuolar protein sorting factor Vps13.","evidence":"Positional cloning, sequence analysis, and homology to S. cerevisiae VPS13","pmids":["12730828"],"confidence":"Low","gaps":["Homology-based prediction only; no direct functional data for the human protein","Subcellular localization not determined","No biochemical activity established"]},{"year":2011,"claim":"Demonstration that VPS13B is a peripheral cis-Golgi membrane protein whose depletion fragments the Golgi ribbon established Golgi maintenance as its primary cellular function and linked Golgi disruption to Cohen syndrome pathology.","evidence":"Immunofluorescence co-localization with GM130, RNAi knockdown, subcellular fractionation, and patient fibroblast analysis","pmids":["21865173"],"confidence":"High","gaps":["Mechanism of Golgi recruitment unknown","No direct interacting partners identified","Whether Golgi fragmentation is cause or consequence of downstream phenotypes unclear"]},{"year":2014,"claim":"Discovery that VPS13B is a RAB6 effector — binding preferentially to GTP-bound RAB6 — explained how VPS13B is recruited to Golgi membranes and connected Golgi integrity to neurite outgrowth in primary neurons.","evidence":"Co-immunoprecipitation with RAB6 mutants (constitutively active Q72L, dominant-negative T27N), membrane solubilization assay, RAB6 RNAi, and neuron morphology assay","pmids":["25492866"],"confidence":"High","gaps":["Whether RAB6 is the sole Golgi recruiter or acts in concert with other factors","Molecular mechanism by which VPS13B maintains Golgi structure unresolved","Lipid transfer activity not yet demonstrated"]},{"year":2019,"claim":"Vps13b knockout mice recapitulated key Cohen syndrome features — motor deficits, spatial learning impairment — validating the mouse as a disease model and confirming a neuronal requirement for VPS13B in vivo.","evidence":"Mouse Vps13b exon 2 deletion, behavioral testing (open field, rotarod, Morris water maze)","pmids":["31495077"],"confidence":"Medium","gaps":["Cellular and circuit-level mechanisms underlying behavioral deficits not explored","Single knockout allele studied"]},{"year":2020,"claim":"VPS13B loss was shown to upregulate autophagy and cause autophagic vacuole accumulation at axonal terminals, revealing a connection between Golgi dysfunction and autophagosome dysregulation in Cohen syndrome neurons; separately, Vps13b KO mice developed cataracts with lens vacuolation and fibrosis, extending the phenotypic spectrum.","evidence":"iPSC-derived neurons from patients, CRISPR KO HeLa cells with autophagic flux assays and transcriptomics; Vps13b KO mouse ophthalmoscopy, histology, immunohistochemistry","pmids":["32375900","32915983"],"confidence":"Medium","gaps":["Whether autophagy upregulation is compensatory or pathogenic unclear","Direct mechanistic link between Golgi fragmentation and autophagy induction not established","Lens phenotype mechanism not connected to known VPS13B molecular functions"]},{"year":2023,"claim":"Super-resolution imaging refined VPS13B localization to the cis-trans Golgi interface and identified FAM177A1 as a physical interactor whose loss phenocopies VPS13B deficiency, while comprehensive KO mouse analysis revealed microcephaly, neuroanatomical changes, and infantile neuronal death — establishing both a new binding partner and the developmental window of VPS13B requirement.","evidence":"Super-resolution microscopy, BFA-washout Golgi reformation assay, co-IP, zebrafish genetic interaction, KO mouse 2D/3D brain morphometry and behavioral testing","pmids":["39331042","37573958"],"confidence":"High","gaps":["Function of FAM177A1 in the VPS13B complex not determined","Whether VPS13B acts as a lipid channel at the cis-trans interface not tested","Mechanism of infantile neuronal death not defined"]},{"year":2024,"claim":"Identification of Sec23IP as the adaptor that recruits VPS13B to ERES-Golgi contacts via the VAB domain, and demonstration that this interaction is required for tubular ERGIC formation and procollagen export, provided a molecular mechanism for the joint laxity phenotype in Cohen syndrome.","evidence":"Co-IP, VAB domain mutagenesis with disease-associated missense mutations, ERGIC tubule formation assay, procollagen secretion assay, KO cell lines","pmids":["39352497"],"confidence":"High","gaps":["Whether VPS13B transfers lipids at ERES-Golgi contacts specifically is not shown","Structural basis of VAB-Sec23IP interaction unresolved","In vivo validation of procollagen trafficking defect in animal models lacking"]},{"year":2025,"claim":"VPS13B was shown to localize to MFN2-positive mitochondria and deliver PI4P-rich Golgi vesicles to mitochondrial fission sites, enabling membrane scission independently of DRP1 constriction; this established VPS13B as a lipid transfer protein linking Golgi and mitochondrial biology and explained the elongated mitochondria and impaired mitophagy in Cohen syndrome.","evidence":"Live-cell imaging, mitochondrial morphology and membrane potential measurements, mitophagy assays, PI4P depletion, DRP1 recruitment assay, C-terminal domain mapping, patient iPSC-derived neurons","pmids":["41402289"],"confidence":"High","gaps":["Direct lipid transfer activity not reconstituted in vitro with purified protein","Whether PI4P is the sole lipid species transferred is unknown","Relative contribution of Golgi versus mitochondrial dysfunction to Cohen syndrome phenotypes not dissected"]},{"year":2026,"claim":"VPS13B was found to regulate surface trafficking of the tight junction protein CXADR by preventing its lysosomal degradation, revealing a cargo-specific role in epithelial barrier maintenance relevant to periodontal pathology in Cohen syndrome.","evidence":"VPS13B KO gingival epithelial cells, surface CXADR assay, bafilomycin A1 rescue, CXADR-JAM1 chimera, epithelial permeability assay","pmids":["41730960"],"confidence":"Medium","gaps":["Mechanism by which VPS13B sorts CXADR away from lysosomes not defined","Whether this trafficking role is direct or secondary to Golgi disruption unclear","Single study, awaits independent confirmation"]},{"year":null,"claim":"Key unresolved questions include whether VPS13B functions as a bona fide lipid transfer channel (no in vitro reconstitution exists), how its multiple organellar localizations are coordinately regulated, and which specific VPS13B functions — Golgi maintenance, ER-Golgi transport, or mitochondrial fission — are primarily responsible for neurodevelopmental pathology in Cohen syndrome.","evidence":"","pmids":[],"confidence":"Low","gaps":["No in vitro lipid transfer reconstitution with purified VPS13B","No high-resolution structure of full-length VPS13B or its lipid-binding channel","Relative pathogenic contribution of Golgi vs. mitochondrial vs. trafficking defects to Cohen syndrome phenotypes not resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[10]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,8]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[1,2,7,8,11]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[10]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,2,8,12]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[4]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[7,10]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[8,12]}],"complexes":[],"partners":["RAB6A","SEC23IP","FAM177A1","MFN2","CXADR"],"other_free_text":[]},"mechanistic_narrative":"VPS13B is a large peripheral membrane protein that functions as a lipid transfer bridge at multiple organellar contact sites, maintaining Golgi ribbon integrity, facilitating ER-to-Golgi transport, and promoting mitochondrial fission. It localizes to the cis-trans Golgi interface where it is recruited by RAB6-GTP and by Sec23IP at ERES-Golgi contacts via its VAB domain; loss of VPS13B causes Golgi fragmentation, failure to form tubular ERGIC carriers, impaired procollagen secretion, and defective neurite outgrowth [PMID:21865173, PMID:25492866, PMID:39352497, PMID:39331042]. VPS13B also localizes to Mitofusin 2-positive mitochondria where it delivers PI4P-rich Golgi-derived vesicles to fission sites, enabling DRP1-independent membrane scission; its loss produces elongated mitochondria with reduced membrane potential and impaired mitophagy [PMID:41402289]. Biallelic loss-of-function mutations in VPS13B cause Cohen syndrome, an autosomal recessive disorder characterized by intellectual disability, microcephaly, joint laxity, and retinal dystrophy, phenotypes recapitulated in knockout mouse models showing microcephaly, motor and cognitive deficits, and cataracts [PMID:12730828, PMID:37573958, PMID:32915983]."},"prefetch_data":{"uniprot":{"accession":"Q7Z7G8","full_name":"Intermembrane lipid transfer protein VPS13B","aliases":["Cohen syndrome protein 1","Vacuolar protein sorting-associated protein 13B"],"length_aa":4022,"mass_kda":448.7,"function":"Mediates the transfer of lipids between membranes at organelle contact sites (By similarity). Binds phosphatidylinositol 3-phosphate (By similarity). Functions as a tethering factor in the slow endocytic recycling pathway, to assist traffic between early and recycling endosomes (PubMed:24334764, PubMed:30962439, PubMed:32375900). Involved in the transport of proacrosomal vesicles to the nuclear dense lamina (NDL) during spermatid development (By similarity). Plays a role in the assembly of the Golgi apparatus, possibly by mediating trafficking to the Golgi membrane (PubMed:21865173). Plays a role in the development of the nervous system, and may be required for neuron projection development (PubMed:25492866, PubMed:32560273). May also play a role during adipose tissue development (PubMed:26358774). Required for maintenance of the ocular lens (By similarity)","subcellular_location":"Recycling endosome membrane; Cytoplasmic vesicle, secretory vesicle, acrosome membrane; Golgi apparatus, cis-Golgi network membrane; Endoplasmic reticulum-Golgi intermediate compartment membrane; Golgi apparatus, trans-Golgi network membrane; Early endosome membrane; Lysosome membrane","url":"https://www.uniprot.org/uniprotkb/Q7Z7G8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VPS13B","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/VPS13B","total_profiled":1310},"omim":[{"mim_id":"619181","title":"FAMILY WITH SEQUENCE SIMILARITY 177, MEMBER A1; FAM177A1","url":"https://www.omim.org/entry/619181"},{"mim_id":"618921","title":"LACTAMASE, BETA-2; LACTB2","url":"https://www.omim.org/entry/618921"},{"mim_id":"607817","title":"VACUOLAR PROTEIN SORTING 13 HOMOLOG B; VPS13B","url":"https://www.omim.org/entry/607817"},{"mim_id":"601993","title":"NUCLEAR RECEPTOR COACTIVATOR 2; NCOA2","url":"https://www.omim.org/entry/601993"},{"mim_id":"216550","title":"COHEN SYNDROME; COH1","url":"https://www.omim.org/entry/216550"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cell Junctions","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/VPS13B"},"hgnc":{"alias_symbol":["BLTP5B"],"prev_symbol":["CHS1","COH1"]},"alphafold":{"accession":"Q7Z7G8","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z7G8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z7G8-5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z7G8-5-F1-predicted_aligned_error_v6.png","plddt_mean":71.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VPS13B","jax_strain_url":"https://www.jax.org/strain/search?query=VPS13B"},"sequence":{"accession":"Q7Z7G8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q7Z7G8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q7Z7G8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z7G8"}},"corpus_meta":[{"pmid":"12730828","id":"PMC_12730828","title":"Cohen syndrome is caused by mutations in a novel gene, COH1, encoding a transmembrane protein with a presumed role in 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vesicle-mediated sorting and intracellular protein transport.\",\n      \"method\": \"Sequence analysis, homology to yeast Vps13, gene characterization\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational/homology prediction, no direct functional assay\",\n      \"pmids\": [\"12730828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"COH1/VPS13B is a peripheral Golgi membrane protein that co-localizes with the cis-Golgi matrix protein GM130; RNAi-mediated depletion causes fragmentation of the Golgi ribbon into ministacks, and Golgi fragmentation is also observed in fibroblasts from Cohen syndrome patients.\",\n      \"method\": \"Immunofluorescence co-localization, RNAi knockdown, patient fibroblast analysis, subcellular fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (localization, RNAi KD with defined cellular phenotype, patient cells), replicated in patient fibroblasts\",\n      \"pmids\": [\"21865173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"COH1/VPS13B physically interacts with the active GTP-bound form of RAB6 at the Golgi complex; RAB6A/A' knockdown prevents COH1 Golgi localization, constitutively inactive RAB6_T27N increases solubilization of COH1 from membranes, and co-IP confirms preferential interaction with constitutively active RAB6_Q72L. COH1 depletion in primary neurons impairs neurite outgrowth, linking Golgi integrity to axonal outgrowth.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, dominant-negative/constitutively active RAB6 mutants, membrane solubilization assay, primary neuron morphology assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with multiple RAB6 mutants, RNAi with defined cellular phenotypes in neurons, multiple orthogonal methods in one study\",\n      \"pmids\": [\"25492866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Vps13b mutant mice (exon 2 deletion) display motor deficits (reduced open field activity, shorter rotarod latency) and spatial learning deficits (Morris water maze), recapitulating intellectual disability and hypotonia features of Cohen syndrome.\",\n      \"method\": \"Mouse knockout model, behavioral testing (open field, rotarod, Morris water maze)\",\n      \"journal\": \"Experimental neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined behavioral phenotypes, single study\",\n      \"pmids\": [\"31495077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"VPS13B loss (patient iPSC-derived neurons and CRISPR KO HeLa cells) leads to accumulation of autophagic vacuoles at axonal terminals and upregulation of autophagic flux; transcriptomic analysis reveals dysregulation of autophagosome organization genes including upregulation of ATG4C.\",\n      \"method\": \"iPSC-derived neurons from Cohen syndrome patients, CRISPR/Cas9 VPS13B KO HeLa cells, autophagic flux assays, transcriptomic analysis\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple cell models (patient iPSC neurons + KO cell line) with orthogonal readouts, single lab\",\n      \"pmids\": [\"32375900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In a Vps13b knockout mouse model, VPS13B participates in lens homeostasis; loss of VPS13B leads to cataract formation associated with large vacuoles in the cortical lens area, epithelial-mesenchymal transition, and fibrosis.\",\n      \"method\": \"Vps13b knockout mouse (Vps13b∆Ex3/∆Ex3), ophthalmoscopy, slit-lamp examination, histology, immunohistochemistry, western blot\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with defined cellular phenotype and multiple readouts, single study\",\n      \"pmids\": [\"32915983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Vps13b is differentially expressed across brain regions with highest expression in cerebellum, hippocampus, and cortex with postnatal peak; Vps13b-/- mice display microcephaly, growth delay, hypotonia, altered memory, and enhanced sociability. Specific neuroanatomical changes include reduction in dentate gyrus size and thinning of motor cortex layer VI, with increased neuronal death during infantile stages but no progression in adulthood.\",\n      \"method\": \"Vps13b knockout mouse model, 2D and 3D brain histo-morphological analyses, behavioral testing, expression profiling across brain regions\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — comprehensive KO mouse characterization with multiple orthogonal methods, single lab\",\n      \"pmids\": [\"37573958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VPS13B localizes at the interface between proximal and distal Golgi subcompartments (cis-trans interface); VPS13B KO cells show delayed Golgi complex reformation after Brefeldin A-induced disruption. VPS13B physically interacts with FAM177A1, a Golgi protein whose loss phenocopies VPS13B KO delay. In zebrafish, vps13b genetically interacts with fam177a1.\",\n      \"method\": \"Super-resolution microscopy, BFA-washout Golgi reformation assay, co-IP/interaction studies, zebrafish genetic interaction\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — super-resolution localization, functional KO assay, genetic epistasis in zebrafish, and biochemical interaction in one study\",\n      \"pmids\": [\"39331042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"VPS13B is recruited to ER exit site (ERES)-Golgi interfaces by the adaptor protein Sec23IP via direct interaction through the VPS13 adaptor binding (VAB) domain. This interaction promotes ERES-Golgi association. Disease-associated missense mutations in VPS13B-VAB impair Sec23IP binding. Loss of VPS13B or Sec23IP blocks formation of tubular ERGIC (an unconventional ER-to-Golgi cargo carrier) and delays ER export of procollagen, linking VPS13B function to joint laxity in Cohen syndrome patients.\",\n      \"method\": \"Co-IP, direct interaction mapping, VAB domain mutagenesis, ERGIC tubule formation assay, procollagen secretion assay, KO cell lines\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding domain identified with mutagenesis, multiple functional assays (tubular ERGIC, procollagen secretion), disease mutations tested\",\n      \"pmids\": [\"39352497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VPS13B localizes to and promotes formation of Golgi-lipid droplet membrane contact sites (MCSs) upon oleic acid stimulation; depletion of VPS13B moderately reduces Golgi-LD contact formation in addition to causing Golgi fragmentation.\",\n      \"method\": \"3D high-resolution microscopy, oleic acid stimulation, VPS13B depletion\",\n      \"journal\": \"Contact (Thousand Oaks)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single study, microscopy-based localization with partial functional follow-up\",\n      \"pmids\": [\"38090145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"VPS13B localizes to Mitofusin 2-positive mitochondria via its C-terminal region and recruits phosphatidylinositol-4-phosphate (PI4P)-rich Golgi vesicles to mitochondrial fission sites. Loss of VPS13B (including in Cohen syndrome patient-derived neurons) causes abnormally elongated/fused mitochondria with reduced membrane potential and impaired mitophagy. Loss of VPS13B or depletion of PI4P results in incomplete mitochondrial fission despite normal DRP1 recruitment, indicating VPS13B-mediated lipid transfer is required for membrane fission.\",\n      \"method\": \"Live-cell imaging, mitochondrial morphology assays, membrane potential measurements, mitophagy assays, PI4P depletion, DRP1 recruitment assay, patient iPSC-derived neurons, C-terminal domain localization mapping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (lipid transfer, domain mapping, patient neurons, DRP1 epistasis), strong mechanistic model in single study\",\n      \"pmids\": [\"41402289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A VPS13B missense variant (c.710G>C, p.Arg237Pro) shows diminished localization at the Golgi complex by immunofluorescence, establishing that Golgi targeting is functionally relevant for VPS13B and that specific missense mutations disrupt this localization.\",\n      \"method\": \"Functional characterization of missense variant, immunofluorescence Golgi localization assay\",\n      \"journal\": \"Frontiers in neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional localization assay with disease-associated missense variant, single study\",\n      \"pmids\": [\"39723426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"VPS13B regulates intracellular trafficking of the tight junction protein coxsackievirus and adenovirus receptor (CXADR) in gingival epithelial cells; VPS13B knockout causes decreased cell-surface CXADR and increased lysosomal CXADR degradation (bafilomycin A1 rescue), leading to increased epithelial permeability to LPS and PGN. The C-terminus of CXADR (not JAM1) is required for VPS13B-dependent trafficking.\",\n      \"method\": \"VPS13B KO cell lines, surface localization assay, bafilomycin A1 treatment, chimeric CXADR-JAM1 construct, epithelial permeability assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple functional readouts, domain-swap experiment, single study\",\n      \"pmids\": [\"41730960\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VPS13B/COH1 is a large peripheral membrane protein that functions at multiple membrane interfaces: it localizes to the cis-trans Golgi interface (recruited via Sec23IP at ERES-Golgi contacts through its VAB domain), acts as a RAB6 effector for Golgi structural maintenance, transfers phosphatidylinositol-4-phosphate-rich lipids from Golgi vesicles to mitochondrial fission sites to drive DRP1-independent membrane scission, and regulates intracellular trafficking of specific cargo (e.g., CXADR, procollagen); loss of VPS13B causes Golgi fragmentation, defective tubular ERGIC formation, impaired ER-to-Golgi transport, elongated/fused mitochondria with impaired mitophagy, upregulated autophagy, and defective neurite outgrowth—collectively explaining the pleiotropic features of Cohen syndrome.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"VPS13B is a large peripheral membrane protein that functions as a lipid transfer bridge at multiple organellar contact sites, maintaining Golgi ribbon integrity, facilitating ER-to-Golgi transport, and promoting mitochondrial fission. It localizes to the cis-trans Golgi interface where it is recruited by RAB6-GTP and by Sec23IP at ERES-Golgi contacts via its VAB domain; loss of VPS13B causes Golgi fragmentation, failure to form tubular ERGIC carriers, impaired procollagen secretion, and defective neurite outgrowth [PMID:21865173, PMID:25492866, PMID:39352497, PMID:39331042]. VPS13B also localizes to Mitofusin 2-positive mitochondria where it delivers PI4P-rich Golgi-derived vesicles to fission sites, enabling DRP1-independent membrane scission; its loss produces elongated mitochondria with reduced membrane potential and impaired mitophagy [PMID:41402289]. Biallelic loss-of-function mutations in VPS13B cause Cohen syndrome, an autosomal recessive disorder characterized by intellectual disability, microcephaly, joint laxity, and retinal dystrophy, phenotypes recapitulated in knockout mouse models showing microcephaly, motor and cognitive deficits, and cataracts [PMID:12730828, PMID:37573958, PMID:32915983].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of VPS13B/COH1 as the gene mutated in Cohen syndrome established its disease relevance but left its cellular function unknown beyond homology to yeast vacuolar protein sorting factor Vps13.\",\n      \"evidence\": \"Positional cloning, sequence analysis, and homology to S. cerevisiae VPS13\",\n      \"pmids\": [\"12730828\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Homology-based prediction only; no direct functional data for the human protein\",\n        \"Subcellular localization not determined\",\n        \"No biochemical activity established\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstration that VPS13B is a peripheral cis-Golgi membrane protein whose depletion fragments the Golgi ribbon established Golgi maintenance as its primary cellular function and linked Golgi disruption to Cohen syndrome pathology.\",\n      \"evidence\": \"Immunofluorescence co-localization with GM130, RNAi knockdown, subcellular fractionation, and patient fibroblast analysis\",\n      \"pmids\": [\"21865173\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism of Golgi recruitment unknown\",\n        \"No direct interacting partners identified\",\n        \"Whether Golgi fragmentation is cause or consequence of downstream phenotypes unclear\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that VPS13B is a RAB6 effector — binding preferentially to GTP-bound RAB6 — explained how VPS13B is recruited to Golgi membranes and connected Golgi integrity to neurite outgrowth in primary neurons.\",\n      \"evidence\": \"Co-immunoprecipitation with RAB6 mutants (constitutively active Q72L, dominant-negative T27N), membrane solubilization assay, RAB6 RNAi, and neuron morphology assay\",\n      \"pmids\": [\"25492866\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether RAB6 is the sole Golgi recruiter or acts in concert with other factors\",\n        \"Molecular mechanism by which VPS13B maintains Golgi structure unresolved\",\n        \"Lipid transfer activity not yet demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Vps13b knockout mice recapitulated key Cohen syndrome features — motor deficits, spatial learning impairment — validating the mouse as a disease model and confirming a neuronal requirement for VPS13B in vivo.\",\n      \"evidence\": \"Mouse Vps13b exon 2 deletion, behavioral testing (open field, rotarod, Morris water maze)\",\n      \"pmids\": [\"31495077\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Cellular and circuit-level mechanisms underlying behavioral deficits not explored\",\n        \"Single knockout allele studied\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"VPS13B loss was shown to upregulate autophagy and cause autophagic vacuole accumulation at axonal terminals, revealing a connection between Golgi dysfunction and autophagosome dysregulation in Cohen syndrome neurons; separately, Vps13b KO mice developed cataracts with lens vacuolation and fibrosis, extending the phenotypic spectrum.\",\n      \"evidence\": \"iPSC-derived neurons from patients, CRISPR KO HeLa cells with autophagic flux assays and transcriptomics; Vps13b KO mouse ophthalmoscopy, histology, immunohistochemistry\",\n      \"pmids\": [\"32375900\", \"32915983\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether autophagy upregulation is compensatory or pathogenic unclear\",\n        \"Direct mechanistic link between Golgi fragmentation and autophagy induction not established\",\n        \"Lens phenotype mechanism not connected to known VPS13B molecular functions\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Super-resolution imaging refined VPS13B localization to the cis-trans Golgi interface and identified FAM177A1 as a physical interactor whose loss phenocopies VPS13B deficiency, while comprehensive KO mouse analysis revealed microcephaly, neuroanatomical changes, and infantile neuronal death — establishing both a new binding partner and the developmental window of VPS13B requirement.\",\n      \"evidence\": \"Super-resolution microscopy, BFA-washout Golgi reformation assay, co-IP, zebrafish genetic interaction, KO mouse 2D/3D brain morphometry and behavioral testing\",\n      \"pmids\": [\"39331042\", \"37573958\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Function of FAM177A1 in the VPS13B complex not determined\",\n        \"Whether VPS13B acts as a lipid channel at the cis-trans interface not tested\",\n        \"Mechanism of infantile neuronal death not defined\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of Sec23IP as the adaptor that recruits VPS13B to ERES-Golgi contacts via the VAB domain, and demonstration that this interaction is required for tubular ERGIC formation and procollagen export, provided a molecular mechanism for the joint laxity phenotype in Cohen syndrome.\",\n      \"evidence\": \"Co-IP, VAB domain mutagenesis with disease-associated missense mutations, ERGIC tubule formation assay, procollagen secretion assay, KO cell lines\",\n      \"pmids\": [\"39352497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether VPS13B transfers lipids at ERES-Golgi contacts specifically is not shown\",\n        \"Structural basis of VAB-Sec23IP interaction unresolved\",\n        \"In vivo validation of procollagen trafficking defect in animal models lacking\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"VPS13B was shown to localize to MFN2-positive mitochondria and deliver PI4P-rich Golgi vesicles to mitochondrial fission sites, enabling membrane scission independently of DRP1 constriction; this established VPS13B as a lipid transfer protein linking Golgi and mitochondrial biology and explained the elongated mitochondria and impaired mitophagy in Cohen syndrome.\",\n      \"evidence\": \"Live-cell imaging, mitochondrial morphology and membrane potential measurements, mitophagy assays, PI4P depletion, DRP1 recruitment assay, C-terminal domain mapping, patient iPSC-derived neurons\",\n      \"pmids\": [\"41402289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct lipid transfer activity not reconstituted in vitro with purified protein\",\n        \"Whether PI4P is the sole lipid species transferred is unknown\",\n        \"Relative contribution of Golgi versus mitochondrial dysfunction to Cohen syndrome phenotypes not dissected\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"VPS13B was found to regulate surface trafficking of the tight junction protein CXADR by preventing its lysosomal degradation, revealing a cargo-specific role in epithelial barrier maintenance relevant to periodontal pathology in Cohen syndrome.\",\n      \"evidence\": \"VPS13B KO gingival epithelial cells, surface CXADR assay, bafilomycin A1 rescue, CXADR-JAM1 chimera, epithelial permeability assay\",\n      \"pmids\": [\"41730960\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which VPS13B sorts CXADR away from lysosomes not defined\",\n        \"Whether this trafficking role is direct or secondary to Golgi disruption unclear\",\n        \"Single study, awaits independent confirmation\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include whether VPS13B functions as a bona fide lipid transfer channel (no in vitro reconstitution exists), how its multiple organellar localizations are coordinately regulated, and which specific VPS13B functions — Golgi maintenance, ER-Golgi transport, or mitochondrial fission — are primarily responsible for neurodevelopmental pathology in Cohen syndrome.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No in vitro lipid transfer reconstitution with purified VPS13B\",\n        \"No high-resolution structure of full-length VPS13B or its lipid-binding channel\",\n        \"Relative pathogenic contribution of Golgi vs. mitochondrial vs. trafficking defects to Cohen syndrome phenotypes not resolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1, 2, 7, 8, 11]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2, 8, 12]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [7, 10]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [8, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"RAB6A\",\n      \"SEC23IP\",\n      \"FAM177A1\",\n      \"MFN2\",\n      \"CXADR\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}