{"gene":"COG8","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2007,"finding":"The C-terminal 76 amino acids of COG8 are required for its interaction with COG1; a truncating mutation abolishing this interaction disrupts COG complex assembly, leading to loss of COG1 stability and accumulation of smaller COG subcomplexes, with consequent defects in N- and O-glycosylation.","method":"Patient fibroblast analysis with truncating mutation, mass spectrometric glycan analysis, co-immunoprecipitation/Western blot of COG subunits, rescue by transfection with full-length COG8","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal protein-level analysis of COG subunit stability, functional rescue with full-length COG8, replicated across two independent patient studies (PMID:17220172 and PMID:17331980)","pmids":["17220172"],"is_preprint":false},{"year":2007,"finding":"Loss of COG8 protein destabilizes and mislocalizes multiple other COG complex subunits, impairs sialylation of N- and O-glycans, reduces beta-1,4-galactosyltransferase levels, and slows brefeldin A-induced Golgi disruption; lentiviral complementation with wild-type COG8 restores COG subunit localization, sialylation, and normal BFA-induced Golgi disruption.","method":"Patient fibroblast analysis (complete COG8 loss), immunofluorescence of COG subunit localization, glycan analysis, BFA-induced Golgi disruption assay, lentiviral complementation rescue","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (localization, glycan analysis, functional Golgi assay, genetic rescue), independent replication of COG8's role in complex stability and Golgi function","pmids":["17331980"],"is_preprint":false},{"year":2017,"finding":"In yeast, Cog8 cooperates with the Arl3-Arl1 GTPase cascade to regulate Atg9 trafficking at the late Golgi, thereby controlling selective autophagy (the Cvt pathway); double deletion of arl3 or arl1 with cog8 causes profound defects in aminopeptidase I maturation and accumulation of Atg9 at the late Golgi under normal growth conditions.","method":"Yeast genetic double-deletion epistasis (arl3∆cog8∆ and arl1∆cog8∆), aminopeptidase I maturation assay, Atg9 localization by fluorescence microscopy","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with two orthogonal readouts (maturation assay + localization), single lab, yeast ortholog","pmids":["28627726"],"is_preprint":false},{"year":2021,"finding":"COG8 knockout in porcine cells inhibits influenza virus infection by reducing colocalization of viral particles with the early endosome marker EEA1, blocking retrograde transport from the endosome to the trans-Golgi network, and causing accumulation of viral M2 protein in early endosomes; COG8 loss also enhances expression of immune-related genes.","method":"Genome-wide CRISPR-Cas9 screen followed by COG8 knockout validation; viral titer measurement, immunofluorescence colocalization of viral particles with EEA1, M2 protein localization, gene expression analysis","journal":"The CRISPR journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with multiple orthogonal readouts (viral titers, colocalization, protein localization), single lab","pmids":["34935491"],"is_preprint":false},{"year":2011,"finding":"The 3′ end of COG8 overlaps with the PDF gene on the same strand; this overlap is mediated by gain of a novel splice donor site between the COG8 stop codon and the PDF initiation codon, with COG8 sharing the 3′ end via the PDF acceptor site. In primates, loss of the ancestral COG8 polyadenylation signal makes the overlap mandatory.","method":"Comparative genomic analysis, splice site identification, polyadenylation signal mapping across vertebrate species","journal":"Human genetics","confidence":"Low","confidence_rationale":"Tier 4 / Moderate — computational/comparative genomics, no functional protein-level experiment; relevant to COG8 gene structure but not protein mechanism","pmids":["21805148"],"is_preprint":false}],"current_model":"COG8 is a subunit of the hetero-octameric conserved oligomeric Golgi (COG) complex whose C-terminal domain directly binds COG1 to stabilize the intact complex; loss of COG8 destabilizes and mislocalizes other COG subunits, impairs retrograde Golgi membrane trafficking, reduces Golgi-resident glycosyltransferase levels (including beta-1,4-galactosyltransferase), and causes defects in N- and O-glycan sialylation, while in yeast the COG8 ortholog also cooperates with the Arl3-Arl1 GTPase cascade to direct Atg9 trafficking and regulate selective autophagy."},"narrative":{"mechanistic_narrative":"COG8 is a subunit of the conserved oligomeric Golgi (COG) complex that maintains Golgi structural integrity and glycosylation fidelity [PMID:17331980]. Its C-terminal 76 residues mediate a direct interaction with COG1, and a truncating mutation that abolishes this interface disrupts assembly of the intact complex, destabilizes COG1, and produces smaller COG subcomplexes, with downstream defects in N- and O-glycosylation [PMID:17220172]. Complete loss of COG8 destabilizes and mislocalizes multiple other COG subunits, reduces beta-1,4-galactosyltransferase levels, impairs sialylation of N- and O-glycans, and slows brefeldin A-induced Golgi disruption, all of which are reversed by reintroduction of wild-type COG8 [PMID:17331980]. Consistent with a role in retrograde membrane trafficking, COG8 knockout blocks endosome-to-trans-Golgi-network retrograde transport, trapping influenza virus and its M2 protein in early endosomes and thereby restricting infection [PMID:34935491]. In yeast, the COG8 ortholog additionally cooperates with the Arl3-Arl1 GTPase cascade to direct Atg9 trafficking at the late Golgi and control selective autophagy [PMID:28627726].","teleology":[{"year":2007,"claim":"Established that COG8 physically anchors the COG complex through a defined C-terminal COG1-binding region, explaining how its mutation causes a congenital disorder of glycosylation.","evidence":"Patient fibroblast analysis of a truncating mutation, co-IP/Western of COG subunits, glycan mass spectrometry, and rescue with full-length COG8","pmids":["17220172"],"confidence":"High","gaps":["No atomic-resolution structure of the COG8 C-terminus–COG1 interface","Does not define how subcomplex accumulation relates to lobe A vs lobe B architecture"]},{"year":2007,"claim":"Showed that COG8 loss has complex-wide consequences—destabilizing and mislocalizing other subunits and impairing Golgi enzyme levels and trafficking—establishing COG8 as required for overall complex stability and Golgi function.","evidence":"Patient fibroblasts with complete COG8 loss, immunofluorescence of COG subunit localization, glycan analysis, BFA-induced Golgi disruption assay, and lentiviral complementation rescue","pmids":["17331980"],"confidence":"High","gaps":["Mechanism linking subunit mislocalization to slowed BFA response not resolved","Does not identify which glycosyltransferases beyond beta-1,4-galactosyltransferase are directly affected"]},{"year":2011,"claim":"Characterized COG8 gene architecture, showing its 3' end overlaps the adjacent PDF gene via a gained splice donor and shared polyadenylation in primates.","evidence":"Comparative genomic analysis, splice site identification, and polyadenylation signal mapping across vertebrate species","pmids":["21805148"],"confidence":"Low","gaps":["Computational/comparative analysis only, no protein-level experiment","Functional consequence of the COG8-PDF overlap for COG8 protein output untested"]},{"year":2017,"claim":"Connected the COG8 ortholog to autophagy by showing it cooperates with the Arl3-Arl1 GTPase cascade to direct Atg9 trafficking at the late Golgi.","evidence":"Yeast genetic double-deletion epistasis (arl3Δcog8Δ, arl1Δcog8Δ), aminopeptidase I maturation assay, and Atg9 fluorescence localization","pmids":["28627726"],"confidence":"Medium","gaps":["Single lab, yeast ortholog—mammalian conservation of the COG8–Arl3/Arl1 axis untested","No direct physical interaction between Cog8 and the Arl GTPases demonstrated"]},{"year":2021,"claim":"Demonstrated that COG8-dependent retrograde transport is hijacked by influenza, linking COG8 loss to defective endosome-to-TGN trafficking and viral restriction.","evidence":"Genome-wide CRISPR-Cas9 screen with COG8 knockout validation in porcine cells, viral titers, EEA1/M2 colocalization, and immune gene expression analysis","pmids":["34935491"],"confidence":"Medium","gaps":["Single lab; mechanism connecting COG retrograde function to early endosome viral exit not fully resolved","Whether enhanced immune gene expression is a direct or secondary effect of COG8 loss unknown"]},{"year":null,"claim":"How COG8-dependent retrograde trafficking and the COG complex are mechanistically integrated with autophagic Atg9 trafficking in mammalian cells remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mammalian validation of the COG8–Arl3/Arl1–Atg9 autophagy axis","No structural model of COG8 within the assembled octameric complex"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[1,2,3]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,3]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[2]}],"complexes":["COG complex"],"partners":["COG1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96MW5","full_name":"Conserved oligomeric Golgi complex subunit 8","aliases":["Component of oligomeric Golgi complex 8"],"length_aa":612,"mass_kda":68.4,"function":"Required for normal Golgi function","subcellular_location":"Golgi apparatus membrane","url":"https://www.uniprot.org/uniprotkb/Q96MW5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/COG8","classification":"Common Essential","n_dependent_lines":852,"n_total_lines":1208,"dependency_fraction":0.7052980132450332},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/COG8","total_profiled":1310},"omim":[{"mim_id":"615283","title":"EXOCYST COMPLEX COMPONENT 8; EXOC8","url":"https://www.omim.org/entry/615283"},{"mim_id":"611182","title":"CONGENITAL DISORDER OF GLYCOSYLATION, TYPE IIh; CDG2H","url":"https://www.omim.org/entry/611182"},{"mim_id":"606979","title":"COMPONENT OF OLIGOMERIC GOLGI COMPLEX 8; COG8","url":"https://www.omim.org/entry/606979"},{"mim_id":"606977","title":"COMPONENT OF OLIGOMERIC GOLGI COMPLEX 6; COG6","url":"https://www.omim.org/entry/606977"},{"mim_id":"606976","title":"COMPONENT OF OLIGOMERIC GOLGI COMPLEX 4; COG4","url":"https://www.omim.org/entry/606976"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/COG8"},"hgnc":{"alias_symbol":["FLJ22315","DOR1"],"prev_symbol":[]},"alphafold":{"accession":"Q96MW5","domains":[{"cath_id":"-","chopping":"40-148","consensus_level":"medium","plddt":83.0528,"start":40,"end":148},{"cath_id":"1.20.58","chopping":"238-295_312-361","consensus_level":"medium","plddt":93.1667,"start":238,"end":361},{"cath_id":"1.10.357","chopping":"375-398_426-551","consensus_level":"high","plddt":88.9095,"start":375,"end":551}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96MW5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96MW5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96MW5-F1-predicted_aligned_error_v6.png","plddt_mean":79.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COG8","jax_strain_url":"https://www.jax.org/strain/search?query=COG8"},"sequence":{"accession":"Q96MW5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96MW5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96MW5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96MW5"}},"corpus_meta":[{"pmid":"17220172","id":"PMC_17220172","title":"A new inborn error of glycosylation due to a Cog8 deficiency reveals a critical role for the Cog1-Cog8 interaction in COG complex formation.","date":"2007","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17220172","citation_count":103,"is_preprint":false},{"pmid":"8866695","id":"PMC_8866695","title":"An antisense oligodeoxynucleotide to the delta opioid receptor (DOR-1) inhibits morphine tolerance and acute dependence in mice.","date":"1996","source":"Brain research bulletin","url":"https://pubmed.ncbi.nlm.nih.gov/8866695","citation_count":102,"is_preprint":false},{"pmid":"17331980","id":"PMC_17331980","title":"COG8 deficiency causes new congenital disorder of glycosylation type IIh.","date":"2007","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17331980","citation_count":96,"is_preprint":false},{"pmid":"9125445","id":"PMC_9125445","title":"Antisense mapping DOR-1 in mice: further support for delta receptor subtypes.","date":"1997","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/9125445","citation_count":34,"is_preprint":false},{"pmid":"24033469","id":"PMC_24033469","title":"Intra-VTA deltorphin, but not DPDPE, induces place preference in ethanol-drinking rats: distinct DOR-1 and DOR-2 mechanisms control ethanol consumption and reward.","date":"2013","source":"Alcoholism, clinical and experimental research","url":"https://pubmed.ncbi.nlm.nih.gov/24033469","citation_count":19,"is_preprint":false},{"pmid":"28627726","id":"PMC_28627726","title":"The Arl3 and Arl1 GTPases co-operate with Cog8 to regulate selective autophagy via Atg9 trafficking.","date":"2017","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/28627726","citation_count":18,"is_preprint":false},{"pmid":"30690882","id":"PMC_30690882","title":"The first case of antenatal presentation in COG8-congenital disorder of glycosylation with a novel splice site mutation and an extended phenotype.","date":"2019","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/30690882","citation_count":14,"is_preprint":false},{"pmid":"28619360","id":"PMC_28619360","title":"Further delineation of COG8-CDG: A case with novel compound heterozygous mutations diagnosed by targeted exome sequencing.","date":"2017","source":"Clinica chimica acta; international journal of clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28619360","citation_count":10,"is_preprint":false},{"pmid":"34935491","id":"PMC_34935491","title":"Porcine Genome-Wide CRISPR Screen Identifies the Golgi Apparatus Complex Protein COG8 as a Pivotal Regulator of Influenza Virus Infection.","date":"2021","source":"The CRISPR journal","url":"https://pubmed.ncbi.nlm.nih.gov/34935491","citation_count":9,"is_preprint":false},{"pmid":"15390308","id":"PMC_15390308","title":"DOR-1, A novel CD10+ stromal cell line derived from progressive Langerhans cell histiocytosis of bone.","date":"2005","source":"Pediatric blood & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/15390308","citation_count":7,"is_preprint":false},{"pmid":"9048971","id":"PMC_9048971","title":"Blockade of morphine supersensitivity by an antisense oligodeoxynucleotide targeting the delta opioid receptor (DOR-1).","date":"1997","source":"Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/9048971","citation_count":6,"is_preprint":false},{"pmid":"26045774","id":"PMC_26045774","title":"TMED6-COG8 is a novel molecular marker of TFE3 translocation renal cell carcinoma.","date":"2015","source":"International journal of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26045774","citation_count":5,"is_preprint":false},{"pmid":"20036983","id":"PMC_20036983","title":"Kappa2 opioid receptor subtype binding requires the presence of the DOR-1 gene.","date":"2010","source":"Frontiers in bioscience (Scholar edition)","url":"https://pubmed.ncbi.nlm.nih.gov/20036983","citation_count":5,"is_preprint":false},{"pmid":"21805148","id":"PMC_21805148","title":"Successful COG8 and PDF overlap is mediated by alterations in splicing and polyadenylation signals.","date":"2011","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21805148","citation_count":4,"is_preprint":false},{"pmid":"37083278","id":"PMC_37083278","title":"A Rare Case of Cerebrotendinous Xanthomatosis Associated With a Mutation on COG8 Gene.","date":"2023","source":"Journal of investigative medicine high impact case reports","url":"https://pubmed.ncbi.nlm.nih.gov/37083278","citation_count":1,"is_preprint":false},{"pmid":"39705516","id":"PMC_39705516","title":"Genome sequence of Leptolyngbya phage Dor1, a cyanophage induced from a fish pond.","date":"2024","source":"Microbiology resource announcements","url":"https://pubmed.ncbi.nlm.nih.gov/39705516","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":9005,"output_tokens":1497,"usd":0.024735,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8176,"output_tokens":2173,"usd":0.047602,"stage2_stop_reason":"end_turn"},"total_usd":0.072337,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"The C-terminal 76 amino acids of COG8 are required for its interaction with COG1; a truncating mutation abolishing this interaction disrupts COG complex assembly, leading to loss of COG1 stability and accumulation of smaller COG subcomplexes, with consequent defects in N- and O-glycosylation.\",\n      \"method\": \"Patient fibroblast analysis with truncating mutation, mass spectrometric glycan analysis, co-immunoprecipitation/Western blot of COG subunits, rescue by transfection with full-length COG8\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal protein-level analysis of COG subunit stability, functional rescue with full-length COG8, replicated across two independent patient studies (PMID:17220172 and PMID:17331980)\",\n      \"pmids\": [\"17220172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Loss of COG8 protein destabilizes and mislocalizes multiple other COG complex subunits, impairs sialylation of N- and O-glycans, reduces beta-1,4-galactosyltransferase levels, and slows brefeldin A-induced Golgi disruption; lentiviral complementation with wild-type COG8 restores COG subunit localization, sialylation, and normal BFA-induced Golgi disruption.\",\n      \"method\": \"Patient fibroblast analysis (complete COG8 loss), immunofluorescence of COG subunit localization, glycan analysis, BFA-induced Golgi disruption assay, lentiviral complementation rescue\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (localization, glycan analysis, functional Golgi assay, genetic rescue), independent replication of COG8's role in complex stability and Golgi function\",\n      \"pmids\": [\"17331980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In yeast, Cog8 cooperates with the Arl3-Arl1 GTPase cascade to regulate Atg9 trafficking at the late Golgi, thereby controlling selective autophagy (the Cvt pathway); double deletion of arl3 or arl1 with cog8 causes profound defects in aminopeptidase I maturation and accumulation of Atg9 at the late Golgi under normal growth conditions.\",\n      \"method\": \"Yeast genetic double-deletion epistasis (arl3∆cog8∆ and arl1∆cog8∆), aminopeptidase I maturation assay, Atg9 localization by fluorescence microscopy\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with two orthogonal readouts (maturation assay + localization), single lab, yeast ortholog\",\n      \"pmids\": [\"28627726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"COG8 knockout in porcine cells inhibits influenza virus infection by reducing colocalization of viral particles with the early endosome marker EEA1, blocking retrograde transport from the endosome to the trans-Golgi network, and causing accumulation of viral M2 protein in early endosomes; COG8 loss also enhances expression of immune-related genes.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen followed by COG8 knockout validation; viral titer measurement, immunofluorescence colocalization of viral particles with EEA1, M2 protein localization, gene expression analysis\",\n      \"journal\": \"The CRISPR journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with multiple orthogonal readouts (viral titers, colocalization, protein localization), single lab\",\n      \"pmids\": [\"34935491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The 3′ end of COG8 overlaps with the PDF gene on the same strand; this overlap is mediated by gain of a novel splice donor site between the COG8 stop codon and the PDF initiation codon, with COG8 sharing the 3′ end via the PDF acceptor site. In primates, loss of the ancestral COG8 polyadenylation signal makes the overlap mandatory.\",\n      \"method\": \"Comparative genomic analysis, splice site identification, polyadenylation signal mapping across vertebrate species\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Moderate — computational/comparative genomics, no functional protein-level experiment; relevant to COG8 gene structure but not protein mechanism\",\n      \"pmids\": [\"21805148\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"COG8 is a subunit of the hetero-octameric conserved oligomeric Golgi (COG) complex whose C-terminal domain directly binds COG1 to stabilize the intact complex; loss of COG8 destabilizes and mislocalizes other COG subunits, impairs retrograde Golgi membrane trafficking, reduces Golgi-resident glycosyltransferase levels (including beta-1,4-galactosyltransferase), and causes defects in N- and O-glycan sialylation, while in yeast the COG8 ortholog also cooperates with the Arl3-Arl1 GTPase cascade to direct Atg9 trafficking and regulate selective autophagy.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"COG8 is a subunit of the conserved oligomeric Golgi (COG) complex that maintains Golgi structural integrity and glycosylation fidelity [#1]. Its C-terminal 76 residues mediate a direct interaction with COG1, and a truncating mutation that abolishes this interface disrupts assembly of the intact complex, destabilizes COG1, and produces smaller COG subcomplexes, with downstream defects in N- and O-glycosylation [#0]. Complete loss of COG8 destabilizes and mislocalizes multiple other COG subunits, reduces beta-1,4-galactosyltransferase levels, impairs sialylation of N- and O-glycans, and slows brefeldin A-induced Golgi disruption, all of which are reversed by reintroduction of wild-type COG8 [#1]. Consistent with a role in retrograde membrane trafficking, COG8 knockout blocks endosome-to-trans-Golgi-network retrograde transport, trapping influenza virus and its M2 protein in early endosomes and thereby restricting infection [#3]. In yeast, the COG8 ortholog additionally cooperates with the Arl3-Arl1 GTPase cascade to direct Atg9 trafficking at the late Golgi and control selective autophagy [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that COG8 physically anchors the COG complex through a defined C-terminal COG1-binding region, explaining how its mutation causes a congenital disorder of glycosylation.\",\n      \"evidence\": \"Patient fibroblast analysis of a truncating mutation, co-IP/Western of COG subunits, glycan mass spectrometry, and rescue with full-length COG8\",\n      \"pmids\": [\"17220172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution structure of the COG8 C-terminus\\u2013COG1 interface\", \"Does not define how subcomplex accumulation relates to lobe A vs lobe B architecture\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed that COG8 loss has complex-wide consequences\\u2014destabilizing and mislocalizing other subunits and impairing Golgi enzyme levels and trafficking\\u2014establishing COG8 as required for overall complex stability and Golgi function.\",\n      \"evidence\": \"Patient fibroblasts with complete COG8 loss, immunofluorescence of COG subunit localization, glycan analysis, BFA-induced Golgi disruption assay, and lentiviral complementation rescue\",\n      \"pmids\": [\"17331980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking subunit mislocalization to slowed BFA response not resolved\", \"Does not identify which glycosyltransferases beyond beta-1,4-galactosyltransferase are directly affected\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Characterized COG8 gene architecture, showing its 3' end overlaps the adjacent PDF gene via a gained splice donor and shared polyadenylation in primates.\",\n      \"evidence\": \"Comparative genomic analysis, splice site identification, and polyadenylation signal mapping across vertebrate species\",\n      \"pmids\": [\"21805148\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Computational/comparative analysis only, no protein-level experiment\", \"Functional consequence of the COG8-PDF overlap for COG8 protein output untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected the COG8 ortholog to autophagy by showing it cooperates with the Arl3-Arl1 GTPase cascade to direct Atg9 trafficking at the late Golgi.\",\n      \"evidence\": \"Yeast genetic double-deletion epistasis (arl3\\u0394cog8\\u0394, arl1\\u0394cog8\\u0394), aminopeptidase I maturation assay, and Atg9 fluorescence localization\",\n      \"pmids\": [\"28627726\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, yeast ortholog\\u2014mammalian conservation of the COG8\\u2013Arl3/Arl1 axis untested\", \"No direct physical interaction between Cog8 and the Arl GTPases demonstrated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated that COG8-dependent retrograde transport is hijacked by influenza, linking COG8 loss to defective endosome-to-TGN trafficking and viral restriction.\",\n      \"evidence\": \"Genome-wide CRISPR-Cas9 screen with COG8 knockout validation in porcine cells, viral titers, EEA1/M2 colocalization, and immune gene expression analysis\",\n      \"pmids\": [\"34935491\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; mechanism connecting COG retrograde function to early endosome viral exit not fully resolved\", \"Whether enhanced immune gene expression is a direct or secondary effect of COG8 loss unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How COG8-dependent retrograde trafficking and the COG complex are mechanistically integrated with autophagic Atg9 trafficking in mammalian cells remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mammalian validation of the COG8\\u2013Arl3/Arl1\\u2013Atg9 autophagy axis\", \"No structural model of COG8 within the assembled octameric complex\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1, 2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\"COG complex\"],\n    \"partners\": [\"COG1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":5,"faith_total":5,"faith_pct":100.0}}