{"gene":"VPS51","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2002,"finding":"Vps51 (Ykr020w) is a subunit of the Vps fifty-three (GARP/VFT) tethering complex composed of Vps52, Vps53, and Vps54, and is required for retrograde traffic from the early endosome back to the late Golgi in yeast.","method":"Genetic deletion, biochemical co-purification, and functional trafficking assays in yeast","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-purification identifying complex membership, genetic epistasis, multiple functional readouts, replicated in subsequent studies across organisms","pmids":["12446664"],"is_preprint":false},{"year":2002,"finding":"Vps51 is essential for Cvt vesicle formation (selective autophagy pathway) in yeast and cooperates with SNAREs Tlg1 and Tlg2 to correctly target the prApe1-Cvt19-Cvt9 complex to the preautophagosomal structure; autophagosomes in vps51Δ mutants are reduced in size.","method":"Genetic deletion (vps51Δ), morphological analysis of Cvt vesicle formation, epistasis with SNARE mutants","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with specific cellular phenotype, epistasis with SNAREs, single lab","pmids":["12446664"],"is_preprint":false},{"year":2006,"finding":"The N-terminal domain of yeast Tlg1 (a SNARE) binds directly to residues 18–30 of Vps51, which form a short helix that fits into a conserved groove in the three-helix bundle of Tlg1; however, removal of this Tlg1-binding sequence from Vps51 does not block endosome-to-Golgi retrograde traffic in vivo.","method":"Crystal structure determination (X-ray crystallography) of Tlg1 N-terminal domain bound to Vps51 peptide; in vivo traffic assay with Vps51 truncation mutants","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis validation, complemented by in vivo functional assay, single lab","pmids":["16420526"],"is_preprint":false},{"year":2011,"finding":"The C. elegans GARP complex contains a conserved Vps51 subunit; GARP subunits bind specific sets of Golgi SNAREs in yeast two-hybrid assays, supporting a role in tethering and SNARE complex assembly at the Golgi; loss of GARP causes lysosomal morphology defects, and simultaneous loss of GARP and COG complexes results in a synthetic lethal phenotype.","method":"Functional characterization in C. elegans via genetic deletion, lysosomal morphology analysis, yeast two-hybrid interaction assay, synthetic lethality epistasis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with defined organelle phenotype plus yeast two-hybrid for SNARE binding, single lab, two orthogonal approaches","pmids":["21613545"],"is_preprint":false},{"year":2019,"finding":"VPS51 is a shared subunit of the human GARP and EARP heterotetrameric complexes (with VPS52, VPS53, and either VPS54 or VPS50). Patient-derived compound heterozygous mutations reduce GARP/EARP assembly, alter cation-independent mannose 6-phosphate receptor (CI-M6PR) distribution, and cause lysosomal swelling in skin fibroblasts, demonstrating that VPS51 is required for proper endosome-to-TGN and endosome recycling trafficking.","method":"Exome sequencing, fibroblast biochemistry (complex assembly assays), immunofluorescence microscopy of CI-M6PR distribution and lysosomal morphology, proteasome inhibitor rescue of frameshift mutant protein","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient fibroblast loss-of-function with multiple orthogonal cellular readouts (complex assembly, receptor trafficking, lysosome morphology), mechanistically distinct from yeast studies, confirmed by second independent clinical report","pmids":["30624672"],"is_preprint":false},{"year":2019,"finding":"Homozygous intragenic deletion of VPS51 in humans disrupts GARP/EARP complex function, confirming VPS51's essential role in endosome-derived vesicle fusion with the trans-Golgi network and recycling endosomes in vivo.","method":"Whole exome sequencing, clinical genetics confirmation in two affected siblings","journal":"European journal of medical genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genetic identification only, no independent biochemical mechanistic experiments beyond disease confirmation","pmids":["31207318"],"is_preprint":false},{"year":2025,"finding":"A novel homozygous VPS51 missense variant (p.Thr504Met) in patient fibroblasts reduces VPS51 protein levels and autophagy-related protein levels (LC3B, p62, RAB7A, TBC1D15), leads to proteomic disruptions in vesicular trafficking and lysosomal function, and increases mitochondria-lysosome contact sites as detected by live-cell confocal microscopy, indicating that VPS51 dysfunction impairs organelle communication.","method":"Western blotting, mRNA expression analysis, SWATH-MS proteomic profiling, live-cell confocal microscopy of mitochondria-lysosome contacts in patient fibroblasts","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (proteomics, western blot, live imaging) in patient fibroblasts, single lab, novel finding on mitochondria-lysosome contacts","pmids":["40565173"],"is_preprint":false}],"current_model":"VPS51 is a shared structural subunit of the heterotetrameric GARP (Golgi-associated retrograde protein) and EARP (endosome-associated recycling protein) tethering complexes that directly binds the SNARE protein Tlg1/syntaxin via its N-terminal helix to facilitate tethering and fusion of endosome-derived vesicles with the trans-Golgi network and recycling endosomes; loss of VPS51 disrupts retrograde endosomal trafficking, misdistributes the mannose 6-phosphate receptor, causes lysosomal swelling, impairs autophagy, and perturbs mitochondria-lysosome contacts, collectively explaining the severe neurodevelopmental phenotype seen in patients with biallelic VPS51 mutations."},"narrative":{"mechanistic_narrative":"VPS51 is a structural subunit of the GARP (Golgi-associated retrograde protein) tethering complex, together with Vps52, Vps53, and Vps54, where it mediates retrograde vesicle traffic from the early endosome back to the late Golgi [PMID:12446664]. In humans it is shared between the heterotetrameric GARP and EARP complexes (with VPS52, VPS53, and either VPS54 or VPS50), and patient-derived loss-of-function mutations reduce complex assembly, misdistribute the cation-independent mannose 6-phosphate receptor, and cause lysosomal swelling, establishing VPS51 as essential for endosome-to-TGN and endosome-recycling trafficking [PMID:30624672]. Mechanistically, an N-terminal helix of VPS51 (residues 18–30 in yeast) docks directly into a conserved groove of the SNARE Tlg1, linking the complex to SNARE-mediated tethering and fusion, although this binding sequence is dispensable for retrograde traffic in vivo [PMID:16420526]. Beyond its core trafficking role, VPS51 supports selective autophagy and organelle homeostasis: its loss impairs autophagy-related protein levels and increases mitochondria-lysosome contact sites [PMID:40565173]. Biallelic VPS51 mutations cause a severe neurodevelopmental disorder [PMID:30624672].","teleology":[{"year":2002,"claim":"Established VPS51 as a bona fide subunit of the GARP tethering complex and assigned its core cellular function in endosome-to-Golgi retrograde traffic, defining the protein's primary role.","evidence":"Genetic deletion, biochemical co-purification, and trafficking assays in yeast","pmids":["12446664"],"confidence":"High","gaps":["Did not resolve how VPS51 contributes structurally within the four-subunit complex","Mechanism of vesicle tethering at the molecular level not defined"]},{"year":2002,"claim":"Extended VPS51 function beyond retrograde traffic to selective autophagy, showing it cooperates with SNAREs Tlg1/Tlg2 to target cargo to the preautophagosomal structure.","evidence":"vps51Δ deletion, Cvt vesicle morphology analysis, and SNARE epistasis in yeast","pmids":["12446664"],"confidence":"Medium","gaps":["Single lab; direct biochemical SNARE interaction not shown in this context","Whether autophagy role is conserved in mammals not addressed"]},{"year":2006,"claim":"Provided the structural basis for VPS51's link to the fusion machinery by showing its N-terminal helix binds directly into a groove on the Tlg1 SNARE, while revealing this interaction is dispensable for retrograde traffic.","evidence":"X-ray crystallography of Tlg1–Vps51 peptide complex plus in vivo truncation assays in yeast","pmids":["16420526"],"confidence":"High","gaps":["Functional role of the Tlg1 interaction if not retrograde traffic remains unexplained","Single lab; structure limited to a peptide rather than full complex"]},{"year":2011,"claim":"Demonstrated conservation of the VPS51-containing GARP complex in metazoans and tied its loss to lysosomal morphology defects, broadening relevance beyond yeast.","evidence":"Genetic deletion, lysosomal morphology, yeast two-hybrid SNARE binding, and synthetic lethality in C. elegans","pmids":["21613545"],"confidence":"Medium","gaps":["Direct VPS51-SNARE binding inferred from complex-level Y2H, not VPS51-specific","Single lab; mammalian validation pending"]},{"year":2019,"claim":"Defined the human disease relevance and dual-complex membership of VPS51, showing it is shared between GARP and EARP and that its loss disrupts CI-M6PR distribution and lysosome morphology.","evidence":"Exome sequencing plus patient fibroblast biochemistry, immunofluorescence, and proteasome rescue assays","pmids":["30624672"],"confidence":"High","gaps":["Mechanistic basis of the neurodevelopmental phenotype not resolved at the cellular level","How VPS51 partitions between GARP and EARP not quantified"]},{"year":2019,"claim":"Confirmed VPS51's essential in vivo trafficking role through an independent homozygous deletion in affected siblings.","evidence":"Whole exome sequencing and clinical genetics in two siblings","pmids":["31207318"],"confidence":"Low","gaps":["Genetic identification only, no independent biochemical mechanistic experiments","Trafficking consequences inferred rather than directly measured"]},{"year":2025,"claim":"Connected VPS51 dysfunction to impaired autophagy protein homeostasis and altered inter-organelle communication, implicating mitochondria-lysosome contacts in disease pathology.","evidence":"Western blot, mRNA analysis, SWATH-MS proteomics, and live-cell imaging of mitochondria-lysosome contacts in patient fibroblasts","pmids":["40565173"],"confidence":"Medium","gaps":["Single lab and single missense variant; causal chain from trafficking defect to contact-site increase not established","Whether altered contacts drive or follow the trafficking defect unresolved"]},{"year":null,"claim":"How loss of VPS51-dependent retrograde and recycling trafficking mechanistically produces the severe neurodevelopmental phenotype remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No neuronal model linking trafficking defect to developmental outcome","Relative contributions of GARP versus EARP dysfunction to disease not separated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,4]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,4]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,4]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[1,6]}],"complexes":["GARP","EARP"],"partners":["VPS52","VPS53","VPS54","VPS50","TLG1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UID3","full_name":"Vacuolar protein sorting-associated protein 51 homolog","aliases":["Another new gene 2 protein","Protein fat-free homolog"],"length_aa":782,"mass_kda":86.0,"function":"Acts as a component of the GARP complex that is involved in retrograde transport from early and late endosomes to the trans-Golgi network (TGN). The GARP complex is required for the maintenance of protein retrieval from endosomes to the TGN, acid hydrolase sorting, lysosome function, endosomal cholesterol traffic and autophagy. VPS51 participates in retrograde transport of acid hydrolase receptors, likely by promoting tethering and SNARE-dependent fusion of endosome-derived carriers to the TGN (PubMed:20685960). Acts as a component of the EARP complex that is involved in endocytic recycling. The EARP complex associates with Rab4-positive endosomes and promotes recycling of internalized transferrin receptor (TFRC) to the plasma membrane (PubMed:25799061)","subcellular_location":"Golgi apparatus, trans-Golgi network; Recycling endosome","url":"https://www.uniprot.org/uniprotkb/Q9UID3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/VPS51","classification":"Common Essential","n_dependent_lines":863,"n_total_lines":1208,"dependency_fraction":0.7144039735099338},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/VPS51","total_profiled":1310},"omim":[{"mim_id":"619397","title":"ZINC FINGER PROTEIN-LIKE 1; ZFPL1","url":"https://www.omim.org/entry/619397"},{"mim_id":"618606","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 13; PCH13","url":"https://www.omim.org/entry/618606"},{"mim_id":"616465","title":"VPS50, EARP/GARPII COMPLEX SUBUNIT; VPS50","url":"https://www.omim.org/entry/616465"},{"mim_id":"615850","title":"VPS53 SUBUNIT OF GARP COMPLEX; VPS53","url":"https://www.omim.org/entry/615850"},{"mim_id":"615738","title":"VPS51 SUBUNIT OF GARP COMPLEX; VPS51","url":"https://www.omim.org/entry/615738"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/VPS51"},"hgnc":{"alias_symbol":["ANG2","ANG3","FFR"],"prev_symbol":["C11orf3","C11orf2"]},"alphafold":{"accession":"Q9UID3","domains":[{"cath_id":"1.20.58","chopping":"265-390","consensus_level":"high","plddt":86.1274,"start":265,"end":390},{"cath_id":"1.20.1310","chopping":"410-431_442-513_520-560","consensus_level":"high","plddt":90.6987,"start":410,"end":560},{"cath_id":"1.20.58","chopping":"584-633_688-782","consensus_level":"high","plddt":89.9659,"start":584,"end":782}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UID3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UID3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UID3-F1-predicted_aligned_error_v6.png","plddt_mean":80.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VPS51","jax_strain_url":"https://www.jax.org/strain/search?query=VPS51"},"sequence":{"accession":"Q9UID3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UID3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UID3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UID3"}},"corpus_meta":[{"pmid":"67025","id":"PMC_67025","title":"Sources of frequency following responses (FFR) in man.","date":"1977","source":"Electroencephalography and clinical neurophysiology","url":"https://pubmed.ncbi.nlm.nih.gov/67025","citation_count":122,"is_preprint":false},{"pmid":"12446664","id":"PMC_12446664","title":"Vps51 is part of the yeast Vps fifty-three tethering complex essential for retrograde traffic from the early endosome and Cvt vesicle completion.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12446664","citation_count":94,"is_preprint":false},{"pmid":"30624672","id":"PMC_30624672","title":"A neurodevelopmental disorder caused by mutations in the VPS51 subunit of the GARP and EARP complexes.","date":"2019","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30624672","citation_count":54,"is_preprint":false},{"pmid":"16420526","id":"PMC_16420526","title":"Structural analysis of the interaction between the SNARE Tlg1 and Vps51.","date":"2006","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/16420526","citation_count":46,"is_preprint":false},{"pmid":"16111779","id":"PMC_16111779","title":"Purification and characterization of a furfural reductase (FFR) from Escherichia coli strain LYO1--an enzyme important in the detoxification of furfural during ethanol production.","date":"2005","source":"Journal of biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/16111779","citation_count":45,"is_preprint":false},{"pmid":"33497718","id":"PMC_33497718","title":"Subcortical rather than cortical sources of the frequency-following response (FFR) relate to speech-in-noise perception in normal-hearing listeners.","date":"2021","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/33497718","citation_count":37,"is_preprint":false},{"pmid":"11504276","id":"PMC_11504276","title":"Pharmacokinetics and safety of FFR-rFVIIa after single doses in healthy 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autophagosomes in vps51Δ mutants are reduced in size.\",\n      \"method\": \"Genetic deletion (vps51Δ), morphological analysis of Cvt vesicle formation, epistasis with SNARE mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with specific cellular phenotype, epistasis with SNAREs, single lab\",\n      \"pmids\": [\"12446664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The N-terminal domain of yeast Tlg1 (a SNARE) binds directly to residues 18–30 of Vps51, which form a short helix that fits into a conserved groove in the three-helix bundle of Tlg1; however, removal of this Tlg1-binding sequence from Vps51 does not block endosome-to-Golgi retrograde traffic in vivo.\",\n      \"method\": \"Crystal structure determination (X-ray crystallography) of Tlg1 N-terminal domain bound to Vps51 peptide; in vivo traffic assay with Vps51 truncation mutants\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis validation, complemented by in vivo functional assay, single lab\",\n      \"pmids\": [\"16420526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The C. elegans GARP complex contains a conserved Vps51 subunit; GARP subunits bind specific sets of Golgi SNAREs in yeast two-hybrid assays, supporting a role in tethering and SNARE complex assembly at the Golgi; loss of GARP causes lysosomal morphology defects, and simultaneous loss of GARP and COG complexes results in a synthetic lethal phenotype.\",\n      \"method\": \"Functional characterization in C. elegans via genetic deletion, lysosomal morphology analysis, yeast two-hybrid interaction assay, synthetic lethality epistasis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with defined organelle phenotype plus yeast two-hybrid for SNARE binding, single lab, two orthogonal approaches\",\n      \"pmids\": [\"21613545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"VPS51 is a shared subunit of the human GARP and EARP heterotetrameric complexes (with VPS52, VPS53, and either VPS54 or VPS50). Patient-derived compound heterozygous mutations reduce GARP/EARP assembly, alter cation-independent mannose 6-phosphate receptor (CI-M6PR) distribution, and cause lysosomal swelling in skin fibroblasts, demonstrating that VPS51 is required for proper endosome-to-TGN and endosome recycling trafficking.\",\n      \"method\": \"Exome sequencing, fibroblast biochemistry (complex assembly assays), immunofluorescence microscopy of CI-M6PR distribution and lysosomal morphology, proteasome inhibitor rescue of frameshift mutant protein\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient fibroblast loss-of-function with multiple orthogonal cellular readouts (complex assembly, receptor trafficking, lysosome morphology), mechanistically distinct from yeast studies, confirmed by second independent clinical report\",\n      \"pmids\": [\"30624672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Homozygous intragenic deletion of VPS51 in humans disrupts GARP/EARP complex function, confirming VPS51's essential role in endosome-derived vesicle fusion with the trans-Golgi network and recycling endosomes in vivo.\",\n      \"method\": \"Whole exome sequencing, clinical genetics confirmation in two affected siblings\",\n      \"journal\": \"European journal of medical genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genetic identification only, no independent biochemical mechanistic experiments beyond disease confirmation\",\n      \"pmids\": [\"31207318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A novel homozygous VPS51 missense variant (p.Thr504Met) in patient fibroblasts reduces VPS51 protein levels and autophagy-related protein levels (LC3B, p62, RAB7A, TBC1D15), leads to proteomic disruptions in vesicular trafficking and lysosomal function, and increases mitochondria-lysosome contact sites as detected by live-cell confocal microscopy, indicating that VPS51 dysfunction impairs organelle communication.\",\n      \"method\": \"Western blotting, mRNA expression analysis, SWATH-MS proteomic profiling, live-cell confocal microscopy of mitochondria-lysosome contacts in patient fibroblasts\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (proteomics, western blot, live imaging) in patient fibroblasts, single lab, novel finding on mitochondria-lysosome contacts\",\n      \"pmids\": [\"40565173\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VPS51 is a shared structural subunit of the heterotetrameric GARP (Golgi-associated retrograde protein) and EARP (endosome-associated recycling protein) tethering complexes that directly binds the SNARE protein Tlg1/syntaxin via its N-terminal helix to facilitate tethering and fusion of endosome-derived vesicles with the trans-Golgi network and recycling endosomes; loss of VPS51 disrupts retrograde endosomal trafficking, misdistributes the mannose 6-phosphate receptor, causes lysosomal swelling, impairs autophagy, and perturbs mitochondria-lysosome contacts, collectively explaining the severe neurodevelopmental phenotype seen in patients with biallelic VPS51 mutations.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"VPS51 is a structural subunit of the GARP (Golgi-associated retrograde protein) tethering complex, together with Vps52, Vps53, and Vps54, where it mediates retrograde vesicle traffic from the early endosome back to the late Golgi [#0]. In humans it is shared between the heterotetrameric GARP and EARP complexes (with VPS52, VPS53, and either VPS54 or VPS50), and patient-derived loss-of-function mutations reduce complex assembly, misdistribute the cation-independent mannose 6-phosphate receptor, and cause lysosomal swelling, establishing VPS51 as essential for endosome-to-TGN and endosome-recycling trafficking [#4]. Mechanistically, an N-terminal helix of VPS51 (residues 18–30 in yeast) docks directly into a conserved groove of the SNARE Tlg1, linking the complex to SNARE-mediated tethering and fusion, although this binding sequence is dispensable for retrograde traffic in vivo [#2]. Beyond its core trafficking role, VPS51 supports selective autophagy and organelle homeostasis: its loss impairs autophagy-related protein levels and increases mitochondria-lysosome contact sites [#6]. Biallelic VPS51 mutations cause a severe neurodevelopmental disorder [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established VPS51 as a bona fide subunit of the GARP tethering complex and assigned its core cellular function in endosome-to-Golgi retrograde traffic, defining the protein's primary role.\",\n      \"evidence\": \"Genetic deletion, biochemical co-purification, and trafficking assays in yeast\",\n      \"pmids\": [\"12446664\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not resolve how VPS51 contributes structurally within the four-subunit complex\",\n        \"Mechanism of vesicle tethering at the molecular level not defined\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extended VPS51 function beyond retrograde traffic to selective autophagy, showing it cooperates with SNAREs Tlg1/Tlg2 to target cargo to the preautophagosomal structure.\",\n      \"evidence\": \"vps51\\u0394 deletion, Cvt vesicle morphology analysis, and SNARE epistasis in yeast\",\n      \"pmids\": [\"12446664\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab; direct biochemical SNARE interaction not shown in this context\",\n        \"Whether autophagy role is conserved in mammals not addressed\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Provided the structural basis for VPS51's link to the fusion machinery by showing its N-terminal helix binds directly into a groove on the Tlg1 SNARE, while revealing this interaction is dispensable for retrograde traffic.\",\n      \"evidence\": \"X-ray crystallography of Tlg1–Vps51 peptide complex plus in vivo truncation assays in yeast\",\n      \"pmids\": [\"16420526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional role of the Tlg1 interaction if not retrograde traffic remains unexplained\",\n        \"Single lab; structure limited to a peptide rather than full complex\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated conservation of the VPS51-containing GARP complex in metazoans and tied its loss to lysosomal morphology defects, broadening relevance beyond yeast.\",\n      \"evidence\": \"Genetic deletion, lysosomal morphology, yeast two-hybrid SNARE binding, and synthetic lethality in C. elegans\",\n      \"pmids\": [\"21613545\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct VPS51-SNARE binding inferred from complex-level Y2H, not VPS51-specific\",\n        \"Single lab; mammalian validation pending\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined the human disease relevance and dual-complex membership of VPS51, showing it is shared between GARP and EARP and that its loss disrupts CI-M6PR distribution and lysosome morphology.\",\n      \"evidence\": \"Exome sequencing plus patient fibroblast biochemistry, immunofluorescence, and proteasome rescue assays\",\n      \"pmids\": [\"30624672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanistic basis of the neurodevelopmental phenotype not resolved at the cellular level\",\n        \"How VPS51 partitions between GARP and EARP not quantified\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Confirmed VPS51's essential in vivo trafficking role through an independent homozygous deletion in affected siblings.\",\n      \"evidence\": \"Whole exome sequencing and clinical genetics in two siblings\",\n      \"pmids\": [\"31207318\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Genetic identification only, no independent biochemical mechanistic experiments\",\n        \"Trafficking consequences inferred rather than directly measured\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected VPS51 dysfunction to impaired autophagy protein homeostasis and altered inter-organelle communication, implicating mitochondria-lysosome contacts in disease pathology.\",\n      \"evidence\": \"Western blot, mRNA analysis, SWATH-MS proteomics, and live-cell imaging of mitochondria-lysosome contacts in patient fibroblasts\",\n      \"pmids\": [\"40565173\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab and single missense variant; causal chain from trafficking defect to contact-site increase not established\",\n        \"Whether altered contacts drive or follow the trafficking defect unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How loss of VPS51-dependent retrograde and recycling trafficking mechanistically produces the severe neurodevelopmental phenotype remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No neuronal model linking trafficking defect to developmental outcome\",\n        \"Relative contributions of GARP versus EARP dysfunction to disease not separated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [1, 6]}\n    ],\n    \"complexes\": [\"GARP\", \"EARP\"],\n    \"partners\": [\"VPS52\", \"VPS53\", \"VPS54\", \"VPS50\", \"Tlg1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}