{"gene":"COG7","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2002,"finding":"COG7 was identified as a previously uncharacterized subunit of the conserved oligomeric Golgi (COG) complex, a ~37-nm peripheral membrane complex with two globular domains, required for normal Golgi morphology. The complex also contains Cog1-6 and Cog8, and its disruption (in ldlB/ldlC mutants) impairs Golgi structure.","method":"Biochemical purification, deep-etch EM of purified complex, immunofluorescence, analysis of CHO cell mutants","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — purification of native complex, EM structural analysis, multiple orthogonal methods, independently built upon by many subsequent studies","pmids":["11980916"],"is_preprint":false},{"year":2004,"finding":"A splice-site mutation in COG7 impairs integrity of the COG complex and alters Golgi trafficking, resulting in disruption of multiple glycosylation pathways (both N- and O-linked glycosylation).","method":"Patient fibroblast analysis, Western blotting showing reduced COG subunit levels, glycosylation assays","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods in patient-derived cells, replicated across multiple subsequent patient reports","pmids":["15107842"],"is_preprint":false},{"year":2005,"finding":"COG7-deficient cells show that Cog5-7 form a stable subcomplex (lobe B), and Cog8 helps bridge lobe A (Cog1-4) and lobe B (Cog5-7) subcomplexes into the complete COG complex. Only one or two of the seven Cog1/Cog2-dependent Golgi membrane proteins (GEARs) are also sensitive to Cog7 deficiency, indicating COG subunits play distinctive roles.","method":"Immunoblotting, gel filtration, immunofluorescence microscopy of COG-deficient cells (COG7-patient fibroblasts and RNAi knockdown cells)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical and cell biological methods, validated with patient-derived fibroblasts alongside engineered cell lines","pmids":["16051600"],"is_preprint":false},{"year":2006,"finding":"COG7 knockdown (like COG3 knockdown) causes accumulation of COG complex-dependent (CCD) vesicles carrying medial-Golgi enzymes (glycosyltransferases), leading to disrupted glycosylation of plasma membrane and lysosomal glycoproteins. In vitro reconstitution showed COG complex-dependent docking of isolated CCD vesicles, supporting the role of the COG complex in retrograde vesicle tethering and recycling of Golgi-resident glycosylation enzymes.","method":"siRNA knockdown of COG7, immunofluorescence, in vitro vesicle docking reconstitution assay, glycosylation assays","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — includes in vitro reconstitution of vesicle docking plus cellular knockdown with defined glycosylation phenotype, single lab with multiple orthogonal methods","pmids":["16420527"],"is_preprint":false},{"year":2006,"finding":"COG7-deficient patient fibroblasts show slower retrograde transport of Golgi proteins to the ER (via brefeldin A-induced tubules), abnormal localization of ERGIC-53 and v-SNAREs GS15 and GS28, and greatly decreased steady-state GS15 levels. Anterograde trafficking was much less affected. All abnormalities were normalized in COG7-corrected fibroblasts.","method":"Immunofluorescence, brefeldin A retrograde transport assay, Western blotting, complementation with wild-type COG7","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods including complementation rescue, patient-derived fibroblasts, single lab","pmids":["16510524"],"is_preprint":false},{"year":2010,"finding":"Golgin-84 directly interacts with the COG complex through its subunit Cog7 (by protein interaction analyses). CCD vesicles accumulating in Cog3 or Cog7 KD cells carry golgin-84. Golgin-84 on COPI vesicles interacts with the COG complex prior to SNARE assembly, indicating COG7 participates in tethering of intra-Golgi retrograde COPI vesicles via golgin-84.","method":"Co-immunoprecipitation/protein interaction analyses, siRNA knockdown of Cog3/Cog7, immunofluorescence, vesicle characterization","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal interaction shown, supported by knockdown phenocopy and vesicle cargo analysis, single lab","pmids":["20874812"],"is_preprint":false},{"year":2012,"finding":"In Drosophila, loss-of-function Cog7 mutations disrupt Golgi architecture, reduce Golgi stack numbers in primary spermatocytes, impair acroblast assembly in spermatids, and cause cytokinesis failure. Rab11 and the phosphatidylinositol transfer protein Giotto (Gio) fail to recruit to the cleavage site in Cog7 mutants; Gio co-immunoprecipitates with Cog7 and Rab11 in testes, placing Cog7 upstream of a Gio-Rab11 pathway controlling membrane addition during cytokinesis.","method":"Drosophila genetics (loss-of-function mutants), immunofluorescence, co-immunoprecipitation, electron microscopy","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP interaction plus genetic epistasis with defined phenotypic readout, single lab, Drosophila ortholog","pmids":["22946051"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of the Cog5-Cog7 complex revealed that Cog5 belongs to the CATCHR (complexes associated with tethering containing helical rods) fold family, with structural homology to subunits of the Dsl1, exocyst, and GARP complexes. Biochemical and functional studies confirmed the physiological relevance of the Cog5-Cog7 interface, showed it is conserved from yeast to humans, and demonstrated that disruption of this interface in human cells causes defects in trafficking and glycosylation.","method":"X-ray crystallography, biochemical binding assays, mutagenesis, functional assays in human cells (trafficking and glycosylation)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus functional validation in human cells, multiple orthogonal methods in single rigorous study","pmids":["25331899"],"is_preprint":false},{"year":2014,"finding":"Multiple complementary approaches (knock-sideways depletion, FRAP, FLIP) showed that the assembled COG complex does not diffuse freely from Golgi periphery in live HeLa cells. COG subunits (including those in COG7-depleted cells) remained membrane-associated even when Golgi architecture was severely disrupted. Different COG assemblies preferentially bind distinct Golgi membrane partners: β-COP, p115, and SNARE STX5 bind to different COG subunit subcomplexes, indicating multipronged membrane attachment.","method":"Knock-sideways depletion, FRAP, FLIP in live HeLa cells, overexpression of tagged COG subcomplexes, co-immunoprecipitation","journal":"Cellular logistics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple live-cell imaging methods plus interaction studies, single lab","pmids":["24649395"],"is_preprint":false},{"year":2014,"finding":"Targeted silencing of COG7 (along with other lobe B COG subunits COG5, COG6, COG8) inhibited HIV-1 replication at a step preceding late reverse transcription but did not affect viral fusion, implicating COG7-dependent Golgi/TGN trafficking in an early step of HIV-1 replication.","method":"siRNA knockdown of COG7 in human cells, HIV-1 replication assays (RT product formation), viral fusion assay","journal":"Virus research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — knockdown with phenotypic readout but no direct mechanistic pathway placement beyond COG complex function, single lab, single method per step","pmids":["25179963"],"is_preprint":false},{"year":2017,"finding":"In Drosophila, Cog7 colocalizes with GOLPH3 at Golgi stacks. The COG complex cooperates with Rab1 and GOLPH3 to regulate Golgi trafficking; overexpression of GTP-bound Rab1 rescues cytokinesis and locomotor defects caused by loss of Cog7. Cog7 mutants exhibit altered N-glycome profiles and reduced bouton numbers at larval neuromuscular junctions.","method":"Drosophila genetics (loss-of-function mutants), immunofluorescence colocalization, N-glycome mass spectrometry, genetic rescue by Rab1 overexpression, NMJ bouton counting","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (Rab1 rescues Cog7 loss) plus glycomic analysis and morphological readouts, single lab, Drosophila ortholog","pmids":["28883096"],"is_preprint":false},{"year":2021,"finding":"Knockout of COG7 in HEK293T cells reduces glycosaminoglycan (GAG) modification of proteoglycans. Unlike cells lacking COG1 or COG8 (which bridge lobes A and B), COG7 KO cells show reduced GAG chain lengths on secreted proteoglycans. COG7 KO cells (unlike COG4 KO) display longer cell-associated GAG chains than wild-type, suggesting a role for COG7 in cellular turnover of proteoglycans.","method":"CRISPR/KO of COG subunits in HEK293T cells, proteoglycan and GAG chain length analysis","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined KO with specific glycan phenotype, comparison across multiple subunit KOs providing context, single lab","pmids":["34053170"],"is_preprint":false},{"year":2024,"finding":"A COG5 missense variant (p.Leu100Phe) abrogates the COG5-COG7 protein interaction, as confirmed by co-immunoprecipitation in patient-derived cells, demonstrating that this interface is required for COG complex integrity in vivo.","method":"Co-immunoprecipitation in patient-derived cells, in silico stability/solubility analysis","journal":"Journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP in patient-derived cells confirming abrogation of COG5-COG7 interaction, consistent with structural data from PMID 25331899","pmids":["38987656"],"is_preprint":false}],"current_model":"COG7 is a lobe B subunit of the eight-subunit conserved oligomeric Golgi (COG) complex that forms a stable subcomplex with COG5-6 (with COG8 bridging to lobe A); structurally, COG5-COG7 adopt CATCHR helical-rod folds; together the complex functions as a retrograde vesicle tethering factor at the Golgi by interacting with golgin-84 on COPI vesicles and with SNAREs/p115/β-COP to mediate docking and fusion of intra-Golgi transport carriers, thereby recycling glycosyltransferases and maintaining normal Golgi morphology and both N- and O-linked glycosylation."},"narrative":{"mechanistic_narrative":"COG7 is a subunit of the conserved oligomeric Golgi (COG) complex, an eight-subunit peripheral membrane assembly required for normal Golgi morphology and glycosylation [PMID:11980916]. Within the complex, COG7 belongs to the lobe B subcomplex, forming a stable association with COG5 and COG6, while COG8 bridges lobe B to the lobe A subcomplex (COG1-4) [PMID:16051600]; the COG5-COG7 interface is built from a CATCHR helical-rod fold shared with other tethering complexes and is conserved from yeast to humans [PMID:25331899]. Functionally, COG7 mediates retrograde tethering of intra-Golgi COPI vesicles: its depletion causes accumulation of COG complex-dependent vesicles carrying medial-Golgi glycosyltransferases, and isolated such vesicles dock in a COG-dependent manner in vitro [PMID:16420527]. COG7 directly binds golgin-84 on COPI vesicles prior to SNARE assembly, and supports SNARE function, since COG7-deficient cells show mislocalized v-SNAREs GS15 and GS28 and reduced retrograde transport to the ER [PMID:20874812, PMID:16510524]. Through this tethering and recycling activity, COG7 maintains both N- and O-linked glycosylation as well as glycosaminoglycan modification of proteoglycans [PMID:15107842, PMID:34053170], and loss-of-function mutations in COG7 underlie a congenital disorder of glycosylation that disrupts COG complex integrity and Golgi trafficking [PMID:15107842].","teleology":[{"year":2002,"claim":"Established COG7 as a bona fide subunit of the COG complex, defining the molecular context in which all later mechanism would be interpreted.","evidence":"Biochemical purification, deep-etch EM of the native complex, and analysis of CHO Golgi mutants","pmids":["11980916"],"confidence":"High","gaps":["Did not resolve COG7's position within the complex architecture","No functional role for COG7 specifically assigned"]},{"year":2004,"claim":"Connected COG7 to human disease, showing that a splice-site mutation destabilizes the COG complex and broadly disrupts glycosylation, establishing COG7 as a glycosylation-maintaining factor.","evidence":"Patient fibroblast analysis with COG subunit immunoblotting and N-/O-glycosylation assays","pmids":["15107842"],"confidence":"High","gaps":["Did not define the trafficking step COG7 controls","Mechanism linking complex disassembly to glycan defects not resolved"]},{"year":2005,"claim":"Resolved the subcomplex organization, placing COG7 in lobe B (COG5-7) bridged to lobe A by COG8, and showed COG subunits have distinctive, non-redundant roles.","evidence":"Gel filtration, immunoblotting, and immunofluorescence in COG7-patient fibroblasts and RNAi cells","pmids":["16051600"],"confidence":"High","gaps":["Did not determine atomic-level interface geometry","Functional differences between subunits not mechanistically explained"]},{"year":2006,"claim":"Defined COG7's molecular activity as retrograde vesicle tethering, showing depletion accumulates glycosyltransferase-bearing CCD vesicles and reconstituting COG-dependent docking in vitro.","evidence":"siRNA knockdown, immunofluorescence, in vitro vesicle docking reconstitution, and glycosylation assays","pmids":["16420527"],"confidence":"High","gaps":["Direct vesicle-binding partner of COG7 not yet identified","Order of tethering relative to SNARE assembly unresolved"]},{"year":2006,"claim":"Linked COG7 loss to specific SNARE/retrograde-transport defects, showing slowed retrograde transport to the ER and destabilized v-SNAREs GS15/GS28, with rescue upon complementation.","evidence":"Brefeldin A retrograde assay, immunofluorescence, Western blotting, and wild-type COG7 complementation in patient fibroblasts","pmids":["16510524"],"confidence":"High","gaps":["Whether COG7 binds SNAREs directly not shown","Anterograde-versus-retrograde selectivity mechanism unexplained"]},{"year":2010,"claim":"Identified a direct vesicle-side binding partner, golgin-84, showing COG7 engages golgin-84 on COPI vesicles before SNARE assembly to tether retrograde carriers.","evidence":"Co-immunoprecipitation/interaction analyses, COG3/COG7 knockdown, and vesicle cargo characterization","pmids":["20874812"],"confidence":"Medium","gaps":["Single-lab interaction without structural mapping","Stoichiometry and regulation of the COG7-golgin-84 contact unknown"]},{"year":2012,"claim":"Extended COG7 function beyond glycosylation into cytokinesis, placing it upstream of a Giotto-Rab11 membrane-addition pathway in Drosophila.","evidence":"Drosophila loss-of-function genetics, immunofluorescence, co-immunoprecipitation, and EM","pmids":["22946051"],"confidence":"Medium","gaps":["Ortholog-based; human relevance of cytokinesis role not established","Direct versus indirect Cog7-Gio interaction not dissected"]},{"year":2014,"claim":"Provided the atomic basis of the COG5-COG7 interface, revealing a CATCHR fold shared with Dsl1/exocyst/GARP tethers and confirming the interface is functionally required.","evidence":"X-ray crystallography of Cog5-Cog7, mutagenesis, and trafficking/glycosylation assays in human cells","pmids":["25331899"],"confidence":"High","gaps":["No structure of the full assembled complex","How CATCHR rods engage membranes/vesicles not visualized"]},{"year":2014,"claim":"Characterized the membrane-attachment behavior of COG complexes, showing stable membrane association and that distinct subassemblies bind distinct partners (β-COP, p115, STX5).","evidence":"Knock-sideways depletion, FRAP, FLIP in live HeLa cells, and co-immunoprecipitation of tagged subcomplexes","pmids":["24649395"],"confidence":"Medium","gaps":["Which partner COG7 specifically anchors not isolated","Single-lab interaction set"]},{"year":2014,"claim":"Implicated COG7-dependent trafficking in HIV-1 replication at an early pre-reverse-transcription step.","evidence":"siRNA knockdown in human cells with HIV-1 RT-product and fusion assays","pmids":["25179963"],"confidence":"Low","gaps":["No mechanistic pathway placement beyond general COG function","Single lab, single phenotypic readout, indirect effect not excluded"]},{"year":2017,"claim":"Connected COG7 to Rab1/GOLPH3-regulated Golgi trafficking, showing GTP-Rab1 rescues Cog7-loss cytokinesis and neuromuscular defects and that loss alters the N-glycome.","evidence":"Drosophila genetics, colocalization, N-glycome mass spectrometry, and Rab1-overexpression rescue","pmids":["28883096"],"confidence":"Medium","gaps":["Ortholog-based; direct Cog7-GOLPH3/Rab1 contacts not defined","Whether human COG7 acts in the same pathway untested"]},{"year":2021,"claim":"Demonstrated a subunit-specific glycan role, showing COG7 knockout reduces GAG chain length on secreted proteoglycans and alters cell-associated GAG turnover differently from other COG subunits.","evidence":"CRISPR knockout of COG subunits in HEK293T cells with proteoglycan/GAG chain-length analysis","pmids":["34053170"],"confidence":"Medium","gaps":["Mechanism linking COG7 loss to differential GAG turnover unresolved","Specific glycosyltransferases affected not identified"]},{"year":2024,"claim":"Confirmed the in vivo requirement of the COG5-COG7 interface for complex integrity by showing a disease COG5 variant abrogates the interaction in patient cells.","evidence":"Co-immunoprecipitation in patient-derived cells plus in silico stability analysis","pmids":["38987656"],"confidence":"Medium","gaps":["Single co-IP readout in patient cells","Quantitative effect on downstream trafficking not measured"]},{"year":null,"claim":"How COG7 selectively coordinates direct partners (golgin-84, SNAREs, β-COP/p115) into a defined tethering reaction, and how this maps onto the substrate-specific glycosylation defects seen in patients, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of the fully assembled human COG complex on membranes","Direct COG7-SNARE contact not biochemically proven","Rules governing which glycosyltransferases are mislocalized upon COG7 loss unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,5]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2,7]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,8,10]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,4,5]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,11]}],"complexes":["COG complex","COG lobe B subcomplex (COG5-COG6-COG7)"],"partners":["COG5","COG6","COG8","GOLGIN-84","GS15","GS28"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P83436","full_name":"Conserved oligomeric Golgi complex subunit 7","aliases":["Component of oligomeric Golgi complex 7"],"length_aa":770,"mass_kda":86.3,"function":"Required for normal Golgi 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COMPLEX 7; COG7","url":"https://www.omim.org/entry/606978"},{"mim_id":"606977","title":"COMPONENT OF OLIGOMERIC GOLGI COMPLEX 6; COG6","url":"https://www.omim.org/entry/606977"}],"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/COG7"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P83436","domains":[{"cath_id":"-","chopping":"3-175","consensus_level":"medium","plddt":81.3649,"start":3,"end":175},{"cath_id":"-","chopping":"362-501_528-566","consensus_level":"medium","plddt":87.722,"start":362,"end":566},{"cath_id":"-","chopping":"600-765","consensus_level":"high","plddt":77.703,"start":600,"end":765},{"cath_id":"1.10.357","chopping":"216-353","consensus_level":"medium","plddt":89.9436,"start":216,"end":353}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P83436","model_url":"https://alphafold.ebi.ac.uk/files/AF-P83436-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P83436-F1-predicted_aligned_error_v6.png","plddt_mean":82.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COG7","jax_strain_url":"https://www.jax.org/strain/search?query=COG7"},"sequence":{"accession":"P83436","fasta_url":"https://rest.uniprot.org/uniprotkb/P83436.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P83436/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P83436"}},"corpus_meta":[{"pmid":"15107842","id":"PMC_15107842","title":"Mutation 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plants","url":"https://pubmed.ncbi.nlm.nih.gov/37884654","citation_count":8,"is_preprint":false},{"pmid":"24555185","id":"PMC_24555185","title":"Wrinkled skin and fat pads in patients with ALG8-CDG: revisiting skin manifestations in congenital disorders of glycosylation.","date":"2014","source":"Pediatric dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/24555185","citation_count":7,"is_preprint":false},{"pmid":"38274075","id":"PMC_38274075","title":"Discovery and bioinspired total syntheses of unprecedented sesquiterpenoid dimers unveiled bifurcating [4 + 2] cycloaddition and target differentiation of enantiomers.","date":"2023","source":"Chemical science","url":"https://pubmed.ncbi.nlm.nih.gov/38274075","citation_count":7,"is_preprint":false},{"pmid":"40691194","id":"PMC_40691194","title":"Machine learning in Alzheimer's disease genetics.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/40691194","citation_count":6,"is_preprint":false},{"pmid":"34437620","id":"PMC_34437620","title":"Conserved oligomeric Golgi (COG) complex genes functioning in defense are expressed in root cells undergoing a defense response to a pathogenic infection and exhibit regulation my MAPKs.","date":"2021","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/34437620","citation_count":5,"is_preprint":false},{"pmid":"34039270","id":"PMC_34039270","title":"Genetic interaction network has a very limited impact on the evolutionary trajectories in continuous culture-grown populations of yeast.","date":"2021","source":"BMC ecology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/34039270","citation_count":2,"is_preprint":false},{"pmid":"38489667","id":"PMC_38489667","title":"Genome-Wide Genetic Analysis of Dropout in a Controlled Exercise Intervention in Sedentary Adults With Overweight or Obesity and Cardiometabolic Disease.","date":"2024","source":"Annals of behavioral medicine : a publication of the Society of Behavioral Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/38489667","citation_count":0,"is_preprint":false},{"pmid":"38987656","id":"PMC_38987656","title":"Characterization of a missense variant in COG5 in a Tunisian patient with COG5-CDG syndrome and insights into the effect of non-synonymous variants on COG5 protein.","date":"2024","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/38987656","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.12.20.629825","title":"Killer Toxin K28 resistance in yeast relies on COG complex mediated trafficking of the defence factor Ktd1","date":"2024-12-21","source":"bioRxiv","url":"https://doi.org/10.1101/2024.12.20.629825","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":18663,"output_tokens":3515,"usd":0.054357,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11048,"output_tokens":3869,"usd":0.075982,"stage2_stop_reason":"end_turn"},"total_usd":0.130339,"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\": 2002,\n      \"finding\": \"COG7 was identified as a previously uncharacterized subunit of the conserved oligomeric Golgi (COG) complex, a ~37-nm peripheral membrane complex with two globular domains, required for normal Golgi morphology. The complex also contains Cog1-6 and Cog8, and its disruption (in ldlB/ldlC mutants) impairs Golgi structure.\",\n      \"method\": \"Biochemical purification, deep-etch EM of purified complex, immunofluorescence, analysis of CHO cell mutants\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — purification of native complex, EM structural analysis, multiple orthogonal methods, independently built upon by many subsequent studies\",\n      \"pmids\": [\"11980916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A splice-site mutation in COG7 impairs integrity of the COG complex and alters Golgi trafficking, resulting in disruption of multiple glycosylation pathways (both N- and O-linked glycosylation).\",\n      \"method\": \"Patient fibroblast analysis, Western blotting showing reduced COG subunit levels, glycosylation assays\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods in patient-derived cells, replicated across multiple subsequent patient reports\",\n      \"pmids\": [\"15107842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"COG7-deficient cells show that Cog5-7 form a stable subcomplex (lobe B), and Cog8 helps bridge lobe A (Cog1-4) and lobe B (Cog5-7) subcomplexes into the complete COG complex. Only one or two of the seven Cog1/Cog2-dependent Golgi membrane proteins (GEARs) are also sensitive to Cog7 deficiency, indicating COG subunits play distinctive roles.\",\n      \"method\": \"Immunoblotting, gel filtration, immunofluorescence microscopy of COG-deficient cells (COG7-patient fibroblasts and RNAi knockdown cells)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical and cell biological methods, validated with patient-derived fibroblasts alongside engineered cell lines\",\n      \"pmids\": [\"16051600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"COG7 knockdown (like COG3 knockdown) causes accumulation of COG complex-dependent (CCD) vesicles carrying medial-Golgi enzymes (glycosyltransferases), leading to disrupted glycosylation of plasma membrane and lysosomal glycoproteins. In vitro reconstitution showed COG complex-dependent docking of isolated CCD vesicles, supporting the role of the COG complex in retrograde vesicle tethering and recycling of Golgi-resident glycosylation enzymes.\",\n      \"method\": \"siRNA knockdown of COG7, immunofluorescence, in vitro vesicle docking reconstitution assay, glycosylation assays\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — includes in vitro reconstitution of vesicle docking plus cellular knockdown with defined glycosylation phenotype, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"16420527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"COG7-deficient patient fibroblasts show slower retrograde transport of Golgi proteins to the ER (via brefeldin A-induced tubules), abnormal localization of ERGIC-53 and v-SNAREs GS15 and GS28, and greatly decreased steady-state GS15 levels. Anterograde trafficking was much less affected. All abnormalities were normalized in COG7-corrected fibroblasts.\",\n      \"method\": \"Immunofluorescence, brefeldin A retrograde transport assay, Western blotting, complementation with wild-type COG7\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods including complementation rescue, patient-derived fibroblasts, single lab\",\n      \"pmids\": [\"16510524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Golgin-84 directly interacts with the COG complex through its subunit Cog7 (by protein interaction analyses). CCD vesicles accumulating in Cog3 or Cog7 KD cells carry golgin-84. Golgin-84 on COPI vesicles interacts with the COG complex prior to SNARE assembly, indicating COG7 participates in tethering of intra-Golgi retrograde COPI vesicles via golgin-84.\",\n      \"method\": \"Co-immunoprecipitation/protein interaction analyses, siRNA knockdown of Cog3/Cog7, immunofluorescence, vesicle characterization\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal interaction shown, supported by knockdown phenocopy and vesicle cargo analysis, single lab\",\n      \"pmids\": [\"20874812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In Drosophila, loss-of-function Cog7 mutations disrupt Golgi architecture, reduce Golgi stack numbers in primary spermatocytes, impair acroblast assembly in spermatids, and cause cytokinesis failure. Rab11 and the phosphatidylinositol transfer protein Giotto (Gio) fail to recruit to the cleavage site in Cog7 mutants; Gio co-immunoprecipitates with Cog7 and Rab11 in testes, placing Cog7 upstream of a Gio-Rab11 pathway controlling membrane addition during cytokinesis.\",\n      \"method\": \"Drosophila genetics (loss-of-function mutants), immunofluorescence, co-immunoprecipitation, electron microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP interaction plus genetic epistasis with defined phenotypic readout, single lab, Drosophila ortholog\",\n      \"pmids\": [\"22946051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of the Cog5-Cog7 complex revealed that Cog5 belongs to the CATCHR (complexes associated with tethering containing helical rods) fold family, with structural homology to subunits of the Dsl1, exocyst, and GARP complexes. Biochemical and functional studies confirmed the physiological relevance of the Cog5-Cog7 interface, showed it is conserved from yeast to humans, and demonstrated that disruption of this interface in human cells causes defects in trafficking and glycosylation.\",\n      \"method\": \"X-ray crystallography, biochemical binding assays, mutagenesis, functional assays in human cells (trafficking and glycosylation)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus functional validation in human cells, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"25331899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Multiple complementary approaches (knock-sideways depletion, FRAP, FLIP) showed that the assembled COG complex does not diffuse freely from Golgi periphery in live HeLa cells. COG subunits (including those in COG7-depleted cells) remained membrane-associated even when Golgi architecture was severely disrupted. Different COG assemblies preferentially bind distinct Golgi membrane partners: β-COP, p115, and SNARE STX5 bind to different COG subunit subcomplexes, indicating multipronged membrane attachment.\",\n      \"method\": \"Knock-sideways depletion, FRAP, FLIP in live HeLa cells, overexpression of tagged COG subcomplexes, co-immunoprecipitation\",\n      \"journal\": \"Cellular logistics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple live-cell imaging methods plus interaction studies, single lab\",\n      \"pmids\": [\"24649395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Targeted silencing of COG7 (along with other lobe B COG subunits COG5, COG6, COG8) inhibited HIV-1 replication at a step preceding late reverse transcription but did not affect viral fusion, implicating COG7-dependent Golgi/TGN trafficking in an early step of HIV-1 replication.\",\n      \"method\": \"siRNA knockdown of COG7 in human cells, HIV-1 replication assays (RT product formation), viral fusion assay\",\n      \"journal\": \"Virus research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — knockdown with phenotypic readout but no direct mechanistic pathway placement beyond COG complex function, single lab, single method per step\",\n      \"pmids\": [\"25179963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Drosophila, Cog7 colocalizes with GOLPH3 at Golgi stacks. The COG complex cooperates with Rab1 and GOLPH3 to regulate Golgi trafficking; overexpression of GTP-bound Rab1 rescues cytokinesis and locomotor defects caused by loss of Cog7. Cog7 mutants exhibit altered N-glycome profiles and reduced bouton numbers at larval neuromuscular junctions.\",\n      \"method\": \"Drosophila genetics (loss-of-function mutants), immunofluorescence colocalization, N-glycome mass spectrometry, genetic rescue by Rab1 overexpression, NMJ bouton counting\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (Rab1 rescues Cog7 loss) plus glycomic analysis and morphological readouts, single lab, Drosophila ortholog\",\n      \"pmids\": [\"28883096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Knockout of COG7 in HEK293T cells reduces glycosaminoglycan (GAG) modification of proteoglycans. Unlike cells lacking COG1 or COG8 (which bridge lobes A and B), COG7 KO cells show reduced GAG chain lengths on secreted proteoglycans. COG7 KO cells (unlike COG4 KO) display longer cell-associated GAG chains than wild-type, suggesting a role for COG7 in cellular turnover of proteoglycans.\",\n      \"method\": \"CRISPR/KO of COG subunits in HEK293T cells, proteoglycan and GAG chain length analysis\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined KO with specific glycan phenotype, comparison across multiple subunit KOs providing context, single lab\",\n      \"pmids\": [\"34053170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A COG5 missense variant (p.Leu100Phe) abrogates the COG5-COG7 protein interaction, as confirmed by co-immunoprecipitation in patient-derived cells, demonstrating that this interface is required for COG complex integrity in vivo.\",\n      \"method\": \"Co-immunoprecipitation in patient-derived cells, in silico stability/solubility analysis\",\n      \"journal\": \"Journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP in patient-derived cells confirming abrogation of COG5-COG7 interaction, consistent with structural data from PMID 25331899\",\n      \"pmids\": [\"38987656\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"COG7 is a lobe B subunit of the eight-subunit conserved oligomeric Golgi (COG) complex that forms a stable subcomplex with COG5-6 (with COG8 bridging to lobe A); structurally, COG5-COG7 adopt CATCHR helical-rod folds; together the complex functions as a retrograde vesicle tethering factor at the Golgi by interacting with golgin-84 on COPI vesicles and with SNAREs/p115/β-COP to mediate docking and fusion of intra-Golgi transport carriers, thereby recycling glycosyltransferases and maintaining normal Golgi morphology and both N- and O-linked glycosylation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"COG7 is a subunit of the conserved oligomeric Golgi (COG) complex, an eight-subunit peripheral membrane assembly required for normal Golgi morphology and glycosylation [#0]. Within the complex, COG7 belongs to the lobe B subcomplex, forming a stable association with COG5 and COG6, while COG8 bridges lobe B to the lobe A subcomplex (COG1-4) [#2]; the COG5-COG7 interface is built from a CATCHR helical-rod fold shared with other tethering complexes and is conserved from yeast to humans [#7]. Functionally, COG7 mediates retrograde tethering of intra-Golgi COPI vesicles: its depletion causes accumulation of COG complex-dependent vesicles carrying medial-Golgi glycosyltransferases, and isolated such vesicles dock in a COG-dependent manner in vitro [#3]. COG7 directly binds golgin-84 on COPI vesicles prior to SNARE assembly, and supports SNARE function, since COG7-deficient cells show mislocalized v-SNAREs GS15 and GS28 and reduced retrograde transport to the ER [#5, #4]. Through this tethering and recycling activity, COG7 maintains both N- and O-linked glycosylation as well as glycosaminoglycan modification of proteoglycans [#1, #11], and loss-of-function mutations in COG7 underlie a congenital disorder of glycosylation that disrupts COG complex integrity and Golgi trafficking [#1].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established COG7 as a bona fide subunit of the COG complex, defining the molecular context in which all later mechanism would be interpreted.\",\n      \"evidence\": \"Biochemical purification, deep-etch EM of the native complex, and analysis of CHO Golgi mutants\",\n      \"pmids\": [\"11980916\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve COG7's position within the complex architecture\", \"No functional role for COG7 specifically assigned\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected COG7 to human disease, showing that a splice-site mutation destabilizes the COG complex and broadly disrupts glycosylation, establishing COG7 as a glycosylation-maintaining factor.\",\n      \"evidence\": \"Patient fibroblast analysis with COG subunit immunoblotting and N-/O-glycosylation assays\",\n      \"pmids\": [\"15107842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the trafficking step COG7 controls\", \"Mechanism linking complex disassembly to glycan defects not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved the subcomplex organization, placing COG7 in lobe B (COG5-7) bridged to lobe A by COG8, and showed COG subunits have distinctive, non-redundant roles.\",\n      \"evidence\": \"Gel filtration, immunoblotting, and immunofluorescence in COG7-patient fibroblasts and RNAi cells\",\n      \"pmids\": [\"16051600\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not determine atomic-level interface geometry\", \"Functional differences between subunits not mechanistically explained\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined COG7's molecular activity as retrograde vesicle tethering, showing depletion accumulates glycosyltransferase-bearing CCD vesicles and reconstituting COG-dependent docking in vitro.\",\n      \"evidence\": \"siRNA knockdown, immunofluorescence, in vitro vesicle docking reconstitution, and glycosylation assays\",\n      \"pmids\": [\"16420527\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vesicle-binding partner of COG7 not yet identified\", \"Order of tethering relative to SNARE assembly unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked COG7 loss to specific SNARE/retrograde-transport defects, showing slowed retrograde transport to the ER and destabilized v-SNAREs GS15/GS28, with rescue upon complementation.\",\n      \"evidence\": \"Brefeldin A retrograde assay, immunofluorescence, Western blotting, and wild-type COG7 complementation in patient fibroblasts\",\n      \"pmids\": [\"16510524\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether COG7 binds SNAREs directly not shown\", \"Anterograde-versus-retrograde selectivity mechanism unexplained\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified a direct vesicle-side binding partner, golgin-84, showing COG7 engages golgin-84 on COPI vesicles before SNARE assembly to tether retrograde carriers.\",\n      \"evidence\": \"Co-immunoprecipitation/interaction analyses, COG3/COG7 knockdown, and vesicle cargo characterization\",\n      \"pmids\": [\"20874812\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interaction without structural mapping\", \"Stoichiometry and regulation of the COG7-golgin-84 contact unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended COG7 function beyond glycosylation into cytokinesis, placing it upstream of a Giotto-Rab11 membrane-addition pathway in Drosophila.\",\n      \"evidence\": \"Drosophila loss-of-function genetics, immunofluorescence, co-immunoprecipitation, and EM\",\n      \"pmids\": [\"22946051\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ortholog-based; human relevance of cytokinesis role not established\", \"Direct versus indirect Cog7-Gio interaction not dissected\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Provided the atomic basis of the COG5-COG7 interface, revealing a CATCHR fold shared with Dsl1/exocyst/GARP tethers and confirming the interface is functionally required.\",\n      \"evidence\": \"X-ray crystallography of Cog5-Cog7, mutagenesis, and trafficking/glycosylation assays in human cells\",\n      \"pmids\": [\"25331899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of the full assembled complex\", \"How CATCHR rods engage membranes/vesicles not visualized\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Characterized the membrane-attachment behavior of COG complexes, showing stable membrane association and that distinct subassemblies bind distinct partners (β-COP, p115, STX5).\",\n      \"evidence\": \"Knock-sideways depletion, FRAP, FLIP in live HeLa cells, and co-immunoprecipitation of tagged subcomplexes\",\n      \"pmids\": [\"24649395\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which partner COG7 specifically anchors not isolated\", \"Single-lab interaction set\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Implicated COG7-dependent trafficking in HIV-1 replication at an early pre-reverse-transcription step.\",\n      \"evidence\": \"siRNA knockdown in human cells with HIV-1 RT-product and fusion assays\",\n      \"pmids\": [\"25179963\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No mechanistic pathway placement beyond general COG function\", \"Single lab, single phenotypic readout, indirect effect not excluded\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected COG7 to Rab1/GOLPH3-regulated Golgi trafficking, showing GTP-Rab1 rescues Cog7-loss cytokinesis and neuromuscular defects and that loss alters the N-glycome.\",\n      \"evidence\": \"Drosophila genetics, colocalization, N-glycome mass spectrometry, and Rab1-overexpression rescue\",\n      \"pmids\": [\"28883096\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ortholog-based; direct Cog7-GOLPH3/Rab1 contacts not defined\", \"Whether human COG7 acts in the same pathway untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated a subunit-specific glycan role, showing COG7 knockout reduces GAG chain length on secreted proteoglycans and alters cell-associated GAG turnover differently from other COG subunits.\",\n      \"evidence\": \"CRISPR knockout of COG subunits in HEK293T cells with proteoglycan/GAG chain-length analysis\",\n      \"pmids\": [\"34053170\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking COG7 loss to differential GAG turnover unresolved\", \"Specific glycosyltransferases affected not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Confirmed the in vivo requirement of the COG5-COG7 interface for complex integrity by showing a disease COG5 variant abrogates the interaction in patient cells.\",\n      \"evidence\": \"Co-immunoprecipitation in patient-derived cells plus in silico stability analysis\",\n      \"pmids\": [\"38987656\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single co-IP readout in patient cells\", \"Quantitative effect on downstream trafficking not measured\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How COG7 selectively coordinates direct partners (golgin-84, SNAREs, β-COP/p115) into a defined tethering reaction, and how this maps onto the substrate-specific glycosylation defects seen in patients, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the fully assembled human COG complex on membranes\", \"Direct COG7-SNARE contact not biochemically proven\", \"Rules governing which glycosyltransferases are mislocalized upon COG7 loss unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 8, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 4, 5]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 11]}\n    ],\n    \"complexes\": [\n      \"COG complex\",\n      \"COG lobe B subcomplex (COG5-COG6-COG7)\"\n    ],\n    \"partners\": [\n      \"COG5\",\n      \"COG6\",\n      \"COG8\",\n      \"golgin-84\",\n      \"GS15\",\n      \"GS28\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":4,"faith_total":5,"faith_pct":80.0}}