{"gene":"COG6","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":2012,"finding":"COG6 interacts with a subset of Golgi SNAREs (STX5, STX6, GS27, SNAP29) via a universal SNARE-binding motif, and this interaction is required for COG6 localization to the Golgi and maintenance of Golgi integrity. Overexpression or depletion of COG6 disrupts Golgi integrity, and a COG6 mutant lacking the SNARE-binding domain fails to localize to the Golgi and cannot induce Golgi fragmentation when overexpressed.","method":"Yeast two-hybrid, co-immunoprecipitation, overexpression/depletion with Golgi morphology readout, domain deletion mutagenesis","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and yeast two-hybrid with functional mutagenesis validation, Moderate-to-Strong evidence from multiple orthogonal methods in one study","pmids":["23057818"],"is_preprint":false},{"year":2013,"finding":"COG6 deficiency in patient cells leads to pronounced reduction of STX6 protein levels, consistent with a stabilizing role of COG6 on STX6, and results in a clinical syndrome of intellectual disability and hypohidrosis without detectable transferrin glycosylation abnormality.","method":"Patient cell expression analysis (protein quantification), autozygosity mapping, exome sequencing","journal":"Journal of medical genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct measurement of STX6 levels in patient cells lacking COG6, single study","pmids":["23606727"],"is_preprint":false},{"year":2025,"finding":"COG6 supports proper sialic acid presentation on the cell surface (required for influenza A virus entry) through its role in Golgi homeostasis, and independently prevents lysosome-dependent degradation of viral proteins; loss of COG6 upregulates lysosomal activity and destabilizes viral proteins, an effect rescued by lysosomal inhibitors. Protein interaction analysis showed COG6 does not directly bind viral proteins, ruling out a shield mechanism.","method":"Genome-wide CRISPR/Cas9 knockout screen, COG6 KO functional assays, lysosomal inhibitor rescue experiments, protein interaction analysis, surface sialic acid quantification","journal":"Microbiology spectrum","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO screen plus multiple orthogonal mechanistic assays (rescue, interaction, surface receptor analysis), Moderate evidence from single lab with complementary methods","pmids":["40910953"],"is_preprint":false},{"year":2025,"finding":"A truncating COG6 variant (p.His302GlnfsTer4) leads to complete absence of COG6 protein, impairment of cooperating COG subunits, and delayed retrograde transport, demonstrating that COG6 is required for retrograde Golgi trafficking and stability of other COG subunits.","method":"Functional studies assessing COG6 subunit expression, cooperating subunit levels, and retrograde transport assay in patient cells; MALDI mass spectrometry glycan analysis","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional assay of retrograde transport and subunit stability in patient cells, single study","pmids":["41362306"],"is_preprint":false}],"current_model":"COG6 is a subunit of the conserved oligomeric Golgi (COG) complex that tethers retrograde intra-Golgi vesicles by interacting with Golgi SNAREs (STX5, STX6, GS27, SNAP29) via a SNARE-binding motif, thereby maintaining Golgi integrity, stabilizing other COG subunits, supporting proper surface sialic acid presentation and protein glycosylation, and preventing lysosome-dependent protein degradation; loss of COG6 disrupts retrograde Golgi transport, destabilizes STX6 and other COG subunits, and causes combined N- and O-glycosylation defects."},"narrative":{"teleology":[{"year":2012,"claim":"Identifying how COG6 engages the vesicle fusion machinery: COG6 was shown to bind Golgi SNAREs (STX5, STX6, GS27, SNAP29) through a conserved SNARE-binding motif, and deletion of this motif abolished Golgi localization and the ability to perturb Golgi morphology, establishing SNARE interaction as the primary mechanism anchoring COG6 at the Golgi and mediating its role in Golgi integrity.","evidence":"Yeast two-hybrid, co-immunoprecipitation, domain-deletion mutagenesis, and overexpression/depletion studies with Golgi morphology readouts in mammalian cells","pmids":["23057818"],"confidence":"High","gaps":["Structural basis of the COG6–SNARE interaction is unresolved","Whether COG6 engages SNAREs simultaneously or sequentially is unknown","Contribution of individual SNARE partners to COG6 function was not dissected"]},{"year":2013,"claim":"Linking COG6 loss to human disease and SNARE stability: patient cells lacking functional COG6 showed pronounced reduction of STX6 protein, demonstrating that COG6 stabilizes at least one of its SNARE partners in vivo and that COG6 deficiency causes a clinical syndrome with intellectual disability and hypohidrosis.","evidence":"Protein quantification in patient-derived cells, autozygosity mapping, and exome sequencing","pmids":["23606727"],"confidence":"Medium","gaps":["Mechanism by which COG6 stabilizes STX6 (direct protection vs. indirect trafficking effect) is not established","No rescue experiment was performed to confirm causality of the COG6 variant","Transferrin glycosylation was normal, leaving the glycosylation spectrum of COG6 deficiency incompletely defined"]},{"year":2025,"claim":"Defining the broader cellular consequences of COG6 loss: COG6 knockout impairs surface sialic acid presentation through disrupted Golgi homeostasis and independently upregulates lysosomal degradation of proteins, demonstrating dual downstream effects—glycosylation defects and enhanced lysosomal catabolism—that are separable and rescued by lysosomal inhibitors.","evidence":"Genome-wide CRISPR/Cas9 knockout screen, COG6 KO functional assays with lysosomal inhibitor rescue, surface sialic acid quantification, and protein interaction analysis in human cells","pmids":["40910953"],"confidence":"High","gaps":["How COG6 loss triggers lysosomal upregulation is mechanistically undefined","Whether enhanced lysosomal degradation is a general consequence of COG complex disruption or specific to COG6 is untested"]},{"year":2025,"claim":"Establishing COG6 as essential for retrograde Golgi transport and COG complex stability: a truncating COG6 variant abolishing protein expression impaired cooperating COG subunit levels and delayed retrograde transport, confirming COG6 as a structural requirement for both the COG complex and its trafficking function.","evidence":"Retrograde transport assays, COG subunit expression analysis, and MALDI mass spectrometry glycan profiling in patient cells","pmids":["41362306"],"confidence":"Medium","gaps":["Which specific COG subunits depend on COG6 for stability and the hierarchy of subunit interdependence are not fully mapped","No reconstitution with purified components to demonstrate direct structural role"]},{"year":null,"claim":"Open question: the structural basis of COG6 integration into the COG complex, the mechanism by which COG6 loss upregulates lysosomal activity, and the full spectrum of glycosylation defects attributable specifically to COG6 remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of COG6 within the octameric COG complex","Causal pathway from COG6 loss to enhanced lysosomal degradation is unknown","Comprehensive glycoproteomics of COG6-deficient cells has not been performed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,2,3]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,3]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,3]}],"complexes":["COG complex"],"partners":["STX5","STX6","GS27","SNAP29"],"other_free_text":[]},"mechanistic_narrative":"COG6 is a subunit of the conserved oligomeric Golgi (COG) complex that functions as a vesicle-tethering factor essential for retrograde intra-Golgi transport and Golgi homeostasis. COG6 interacts with a subset of Golgi SNAREs—STX5, STX6, GS27, and SNAP29—via a universal SNARE-binding motif, and this interaction is required for COG6 Golgi localization and maintenance of Golgi integrity [PMID:23057818]. Loss of COG6 destabilizes STX6 and other COG subunits, delays retrograde Golgi trafficking, impairs cell-surface sialic acid presentation, and upregulates lysosome-dependent protein degradation [PMID:23606727, PMID:41362306, PMID:40910953]. Biallelic loss-of-function variants in COG6 cause a congenital disorder of glycosylation characterized by intellectual disability and additional multisystem features [PMID:23606727, PMID:41362306]."},"prefetch_data":{"uniprot":{"accession":"Q9Y2V7","full_name":"Conserved oligomeric Golgi complex subunit 6","aliases":["Component of oligomeric Golgi complex 6"],"length_aa":657,"mass_kda":73.3,"function":"Required for normal Golgi function","subcellular_location":"Golgi apparatus membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y2V7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/COG6","classification":"Not Classified","n_dependent_lines":306,"n_total_lines":1208,"dependency_fraction":0.2533112582781457},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/COG6","total_profiled":1310},"omim":[{"mim_id":"619286","title":"NEURODEVELOPMENTAL DISORDER WITH SPASTICITY, CATARACTS, AND CEREBELLAR ATROPHY; NEDSCAC","url":"https://www.omim.org/entry/619286"},{"mim_id":"619008","title":"LONG INTERGENIC NONCODING RNA 598; LINC00598","url":"https://www.omim.org/entry/619008"},{"mim_id":"615328","title":"SHAHEEN SYNDROME; SHNS","url":"https://www.omim.org/entry/615328"},{"mim_id":"614576","title":"CONGENITAL DISORDER OF GLYCOSYLATION, TYPE IIl; CDG2L","url":"https://www.omim.org/entry/614576"},{"mim_id":"606977","title":"COMPONENT OF OLIGOMERIC GOLGI COMPLEX 6; COG6","url":"https://www.omim.org/entry/606977"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear speckles","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/COG6"},"hgnc":{"alias_symbol":["COD2","KIAA1134"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y2V7","domains":[{"cath_id":"-","chopping":"237-415","consensus_level":"medium","plddt":92.9675,"start":237,"end":415},{"cath_id":"1.20.1280","chopping":"536-655","consensus_level":"high","plddt":88.8509,"start":536,"end":655},{"cath_id":"1.20.5","chopping":"74-160","consensus_level":"medium","plddt":89.2521,"start":74,"end":160},{"cath_id":"1.10.287","chopping":"163-228","consensus_level":"medium","plddt":85.8329,"start":163,"end":228}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2V7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2V7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2V7-F1-predicted_aligned_error_v6.png","plddt_mean":85.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COG6","jax_strain_url":"https://www.jax.org/strain/search?query=COG6"},"sequence":{"accession":"Q9Y2V7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y2V7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y2V7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2V7"}},"corpus_meta":[{"pmid":"27193031","id":"PMC_27193031","title":"A combined large-scale meta-analysis identifies COG6 as a novel shared risk locus for rheumatoid arthritis and systemic lupus erythematosus.","date":"2016","source":"Annals of the rheumatic diseases","url":"https://pubmed.ncbi.nlm.nih.gov/27193031","citation_count":46,"is_preprint":false},{"pmid":"23606727","id":"PMC_23606727","title":"A novel syndrome of hypohidrosis and intellectual disability is linked to COG6 deficiency.","date":"2013","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23606727","citation_count":43,"is_preprint":false},{"pmid":"23057818","id":"PMC_23057818","title":"COG6 interacts with a subset of the Golgi SNAREs and is important for the Golgi complex integrity.","date":"2012","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/23057818","citation_count":40,"is_preprint":false},{"pmid":"23430903","id":"PMC_23430903","title":"Deficiency of Subunit 6 of the Conserved Oligomeric Golgi Complex (COG6-CDG): Second Patient, Different Phenotype.","date":"2011","source":"JIMD reports","url":"https://pubmed.ncbi.nlm.nih.gov/23430903","citation_count":34,"is_preprint":false},{"pmid":"29445937","id":"PMC_29445937","title":"Secondary Hemophagocytic Syndrome Associated with COG6 Gene Defect: Report and Review.","date":"2018","source":"JIMD reports","url":"https://pubmed.ncbi.nlm.nih.gov/29445937","citation_count":25,"is_preprint":false},{"pmid":"29709711","id":"PMC_29709711","title":"Compound heterozygous variants of the COG6 gene in a Chinese patient with deficiency of subunit 6 of the conserved oligomeric Golgi complex (COG6-CDG).","date":"2018","source":"European journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29709711","citation_count":16,"is_preprint":false},{"pmid":"25264125","id":"PMC_25264125","title":"Investigating the genetic association of HCP5, SPATA2, TNIP1, TNFAIP3 and COG6 with psoriasis in Chinese population.","date":"2014","source":"International journal of immunogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/25264125","citation_count":16,"is_preprint":false},{"pmid":"32499114","id":"PMC_32499114","title":"Arabidopsis COG6 is essential for pollen tube growth and Golgi structure maintenance.","date":"2020","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/32499114","citation_count":13,"is_preprint":false},{"pmid":"32905044","id":"PMC_32905044","title":"Neonatal presentation of COG6-CDG with prominent skin phenotype.","date":"2020","source":"JIMD reports","url":"https://pubmed.ncbi.nlm.nih.gov/32905044","citation_count":12,"is_preprint":false},{"pmid":"37149673","id":"PMC_37149673","title":"Decrease of lethal infectious complications in the context of causes of death (COD) after hematopoietic cell transplantation: COD-2 and COD-1 study of the Infectious Diseases Working Party EBMT.","date":"2023","source":"Bone marrow transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/37149673","citation_count":11,"is_preprint":false},{"pmid":"35068072","id":"PMC_35068072","title":"COG6-CDG: Novel variants and novel malformation.","date":"2022","source":"Birth defects research","url":"https://pubmed.ncbi.nlm.nih.gov/35068072","citation_count":9,"is_preprint":false},{"pmid":"33394555","id":"PMC_33394555","title":"Disorder of sex development associated with a novel homozygous nonsense mutation in COG6 expands the phenotypic spectrum of COG6-CDG.","date":"2021","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/33394555","citation_count":8,"is_preprint":false},{"pmid":"35048409","id":"PMC_35048409","title":"Lethal COG6-CDG in neonatal patient with arachnodactyly, joint contractures, and skin manifestations: Founder mutation in the Southeastern European population?","date":"2022","source":"Pediatric dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/35048409","citation_count":4,"is_preprint":false},{"pmid":"40213872","id":"PMC_40213872","title":"COG6-related prenatal phenotype (CDG2L): Clinico-pathological report and review of the literature.","date":"2025","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40213872","citation_count":0,"is_preprint":false},{"pmid":"39528286","id":"PMC_39528286","title":"[Clinical features and genetic analysis of a child with Congenital disorder of glycosylation due to novel variants of COG6 gene].","date":"2024","source":"Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/39528286","citation_count":0,"is_preprint":false},{"pmid":"41362306","id":"PMC_41362306","title":"Insights Into the Pathological Glycosylation Associated With COG6-CDG.","date":"2025","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/41362306","citation_count":0,"is_preprint":false},{"pmid":"40910953","id":"PMC_40910953","title":"COG6 is an essential host factor for influenza A virus infection.","date":"2025","source":"Microbiology spectrum","url":"https://pubmed.ncbi.nlm.nih.gov/40910953","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":9575,"output_tokens":1142,"usd":0.022927},"stage2":{"model":"claude-opus-4-6","input_tokens":4340,"output_tokens":1652,"usd":0.0945},"total_usd":0.117427,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"COG6 interacts with a subset of Golgi SNAREs (STX5, STX6, GS27, SNAP29) via a universal SNARE-binding motif, and this interaction is required for COG6 localization to the Golgi and maintenance of Golgi integrity. Overexpression or depletion of COG6 disrupts Golgi integrity, and a COG6 mutant lacking the SNARE-binding domain fails to localize to the Golgi and cannot induce Golgi fragmentation when overexpressed.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, overexpression/depletion with Golgi morphology readout, domain deletion mutagenesis\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and yeast two-hybrid with functional mutagenesis validation, Moderate-to-Strong evidence from multiple orthogonal methods in one study\",\n      \"pmids\": [\"23057818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"COG6 deficiency in patient cells leads to pronounced reduction of STX6 protein levels, consistent with a stabilizing role of COG6 on STX6, and results in a clinical syndrome of intellectual disability and hypohidrosis without detectable transferrin glycosylation abnormality.\",\n      \"method\": \"Patient cell expression analysis (protein quantification), autozygosity mapping, exome sequencing\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct measurement of STX6 levels in patient cells lacking COG6, single study\",\n      \"pmids\": [\"23606727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"COG6 supports proper sialic acid presentation on the cell surface (required for influenza A virus entry) through its role in Golgi homeostasis, and independently prevents lysosome-dependent degradation of viral proteins; loss of COG6 upregulates lysosomal activity and destabilizes viral proteins, an effect rescued by lysosomal inhibitors. Protein interaction analysis showed COG6 does not directly bind viral proteins, ruling out a shield mechanism.\",\n      \"method\": \"Genome-wide CRISPR/Cas9 knockout screen, COG6 KO functional assays, lysosomal inhibitor rescue experiments, protein interaction analysis, surface sialic acid quantification\",\n      \"journal\": \"Microbiology spectrum\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO screen plus multiple orthogonal mechanistic assays (rescue, interaction, surface receptor analysis), Moderate evidence from single lab with complementary methods\",\n      \"pmids\": [\"40910953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A truncating COG6 variant (p.His302GlnfsTer4) leads to complete absence of COG6 protein, impairment of cooperating COG subunits, and delayed retrograde transport, demonstrating that COG6 is required for retrograde Golgi trafficking and stability of other COG subunits.\",\n      \"method\": \"Functional studies assessing COG6 subunit expression, cooperating subunit levels, and retrograde transport assay in patient cells; MALDI mass spectrometry glycan analysis\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional assay of retrograde transport and subunit stability in patient cells, single study\",\n      \"pmids\": [\"41362306\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"COG6 is a subunit of the conserved oligomeric Golgi (COG) complex that tethers retrograde intra-Golgi vesicles by interacting with Golgi SNAREs (STX5, STX6, GS27, SNAP29) via a SNARE-binding motif, thereby maintaining Golgi integrity, stabilizing other COG subunits, supporting proper surface sialic acid presentation and protein glycosylation, and preventing lysosome-dependent protein degradation; loss of COG6 disrupts retrograde Golgi transport, destabilizes STX6 and other COG subunits, and causes combined N- and O-glycosylation defects.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"COG6 is a subunit of the conserved oligomeric Golgi (COG) complex that functions as a vesicle-tethering factor essential for retrograde intra-Golgi transport and Golgi homeostasis. COG6 interacts with a subset of Golgi SNAREs—STX5, STX6, GS27, and SNAP29—via a universal SNARE-binding motif, and this interaction is required for COG6 Golgi localization and maintenance of Golgi integrity [PMID:23057818]. Loss of COG6 destabilizes STX6 and other COG subunits, delays retrograde Golgi trafficking, impairs cell-surface sialic acid presentation, and upregulates lysosome-dependent protein degradation [PMID:23606727, PMID:41362306, PMID:40910953]. Biallelic loss-of-function variants in COG6 cause a congenital disorder of glycosylation characterized by intellectual disability and additional multisystem features [PMID:23606727, PMID:41362306].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Identifying how COG6 engages the vesicle fusion machinery: COG6 was shown to bind Golgi SNAREs (STX5, STX6, GS27, SNAP29) through a conserved SNARE-binding motif, and deletion of this motif abolished Golgi localization and the ability to perturb Golgi morphology, establishing SNARE interaction as the primary mechanism anchoring COG6 at the Golgi and mediating its role in Golgi integrity.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, domain-deletion mutagenesis, and overexpression/depletion studies with Golgi morphology readouts in mammalian cells\",\n      \"pmids\": [\"23057818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of the COG6–SNARE interaction is unresolved\",\n        \"Whether COG6 engages SNAREs simultaneously or sequentially is unknown\",\n        \"Contribution of individual SNARE partners to COG6 function was not dissected\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linking COG6 loss to human disease and SNARE stability: patient cells lacking functional COG6 showed pronounced reduction of STX6 protein, demonstrating that COG6 stabilizes at least one of its SNARE partners in vivo and that COG6 deficiency causes a clinical syndrome with intellectual disability and hypohidrosis.\",\n      \"evidence\": \"Protein quantification in patient-derived cells, autozygosity mapping, and exome sequencing\",\n      \"pmids\": [\"23606727\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which COG6 stabilizes STX6 (direct protection vs. indirect trafficking effect) is not established\",\n        \"No rescue experiment was performed to confirm causality of the COG6 variant\",\n        \"Transferrin glycosylation was normal, leaving the glycosylation spectrum of COG6 deficiency incompletely defined\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defining the broader cellular consequences of COG6 loss: COG6 knockout impairs surface sialic acid presentation through disrupted Golgi homeostasis and independently upregulates lysosomal degradation of proteins, demonstrating dual downstream effects—glycosylation defects and enhanced lysosomal catabolism—that are separable and rescued by lysosomal inhibitors.\",\n      \"evidence\": \"Genome-wide CRISPR/Cas9 knockout screen, COG6 KO functional assays with lysosomal inhibitor rescue, surface sialic acid quantification, and protein interaction analysis in human cells\",\n      \"pmids\": [\"40910953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How COG6 loss triggers lysosomal upregulation is mechanistically undefined\",\n        \"Whether enhanced lysosomal degradation is a general consequence of COG complex disruption or specific to COG6 is untested\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Establishing COG6 as essential for retrograde Golgi transport and COG complex stability: a truncating COG6 variant abolishing protein expression impaired cooperating COG subunit levels and delayed retrograde transport, confirming COG6 as a structural requirement for both the COG complex and its trafficking function.\",\n      \"evidence\": \"Retrograde transport assays, COG subunit expression analysis, and MALDI mass spectrometry glycan profiling in patient cells\",\n      \"pmids\": [\"41362306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Which specific COG subunits depend on COG6 for stability and the hierarchy of subunit interdependence are not fully mapped\",\n        \"No reconstitution with purified components to demonstrate direct structural role\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Open question: the structural basis of COG6 integration into the COG complex, the mechanism by which COG6 loss upregulates lysosomal activity, and the full spectrum of glycosylation defects attributable specifically to COG6 remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of COG6 within the octameric COG complex\",\n        \"Causal pathway from COG6 loss to enhanced lysosomal degradation is unknown\",\n        \"Comprehensive glycoproteomics of COG6-deficient cells has not been performed\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"complexes\": [\n      \"COG complex\"\n    ],\n    \"partners\": [\n      \"STX5\",\n      \"STX6\",\n      \"GS27\",\n      \"SNAP29\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}