{"gene":"COPG1","run_date":"2026-06-13T19:06:35","timeline":{"discoveries":[{"year":2026,"finding":"COPG1 knockdown in hepatocellular carcinoma cells impaired malignant phenotypes and reduced tumorigenicity in vivo. Mechanistically, COPG1 depletion induced Golgi disruption and ER stress, increased reactive oxygen species (ROS) production, and suppressed PI3K-AKT signaling, thereby sensitizing cells to sorafenib and doxorubicin.","method":"COPG1 knockdown (loss-of-function) in HCC cell lines with in vivo tumorigenicity assay; measurement of Golgi morphology, ER stress markers, ROS production, and PI3K-AKT pathway activity; drug sensitivity assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with defined cellular phenotypes and multiple orthogonal readouts (Golgi disruption, ER stress, ROS, AKT signaling, in vivo), single lab","pmids":["41751842"],"is_preprint":false},{"year":2025,"finding":"COPG1 (as part of the COPI coatomer complex) is required in hepatocytes for HDL holoparticle uptake, selective HDL lipid uptake, and apoA-I secretion. Knockdown of COPG1 decreased cell-surface abundance of scavenger receptor SR-BI (likely via interference with SR-BI glycosylation) and decreased APOA1 expression, while increasing cell-surface ABCA1 abundance and ABCA1-mediated cholesterol efflux.","method":"Genome-wide RNAi screen in Huh-7 hepatocarcinoma cells for fluorescent HDL uptake, followed by targeted siRNA knockdown validation; flow cytometry for SR-BI and ABCA1 surface abundance; apoA-I secretion assay; cholesterol efflux assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide screen with targeted validation, multiple orthogonal cellular readouts, single lab, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.08.21.25332476"],"is_preprint":true},{"year":2024,"finding":"COPG1 (a COPI coatomer subunit) is required for efficient secretion of dengue virus non-structural protein 1 (NS1) from infected cells. siRNA knockdown of COPG1 in DENV-infected cells reduced NS1 secretion without affecting infectious virus egress. Similar effects were observed with West Nile virus, indicating a conserved role for COPI machinery in NS1 secretion across orthoflaviviruses.","method":"Customised membrane-trafficking siRNA screen; targeted siRNA knockdown in DENV- and WNV/KUNV-infected cells with NS1 secretion assays; heterologous expression of wildtype and pathogenic COPI variants; chemical inhibition studies","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA screen validated by targeted KD with multiple viral systems and orthogonal approaches, single lab, preprint not yet peer-reviewed","pmids":["bio_10.1101_2024.10.12.618008"],"is_preprint":true}],"current_model":"COPG1, a subunit of the COPI coatomer complex, is required for Golgi-dependent vesicular trafficking processes including HDL holoparticle uptake and apoA-I secretion in hepatocytes (via regulation of SR-BI glycosylation and surface abundance), efficient dengue/West Nile virus NS1 protein secretion through the early secretory pathway, and maintenance of Golgi integrity and ER homeostasis in cancer cells where its loss suppresses PI3K-AKT signaling, increases ROS, and sensitizes cells to chemotherapy."},"narrative":{"mechanistic_narrative":"COPG1 is a subunit of the COPI coatomer complex that supports Golgi-dependent vesicular trafficking and the integrity of the early secretory pathway [PMID:bio_10.1101_2025.08.21.25332476, PMID:bio_10.1101_2024.10.12.618008]. In hepatocytes, COPG1 is required for HDL holoparticle uptake, selective HDL lipid uptake, and apoA-I secretion; its depletion lowers cell-surface abundance of the scavenger receptor SR-BI (via interference with SR-BI glycosylation) and reduces APOA1 expression, while raising surface ABCA1 and ABCA1-mediated cholesterol efflux [PMID:bio_10.1101_2025.08.21.25332476]. The same COPI trafficking machinery is exploited for efficient secretion of the flaviviral non-structural protein NS1, since COPG1 knockdown reduces NS1 secretion from dengue- and West Nile virus-infected cells without affecting infectious virus egress [PMID:bio_10.1101_2024.10.12.618008]. In hepatocellular carcinoma cells, loss of COPG1 disrupts Golgi morphology and triggers ER stress, elevates reactive oxygen species, and suppresses PI3K-AKT signaling, impairing malignant phenotypes and sensitizing cells to sorafenib and doxorubicin [PMID:41751842]. Beyond these trafficking and cancer-cell phenotypes, no further molecular detail of COPG1 has been characterized in the available corpus.","teleology":[{"year":2024,"claim":"Established that the COPI subunit COPG1 is selectively required for cellular secretion of flaviviral NS1, distinguishing host trafficking needs for protein secretion from those for virus egress.","evidence":"Membrane-trafficking siRNA screen and targeted knockdown in DENV- and WNV/KUNV-infected cells with NS1 secretion assays, plus expression of COPI variants and chemical inhibition (preprint)","pmids":["bio_10.1101_2024.10.12.618008"],"confidence":"Medium","gaps":["Direct interaction between COPG1 and NS1 not demonstrated","Step in the secretory pathway where COPI acts on NS1 not resolved","Preprint not yet peer-reviewed"]},{"year":2025,"claim":"Identified COPG1 as a hepatocyte trafficking factor controlling HDL uptake and apoA-I output through regulation of SR-BI and ABCA1 surface abundance, linking COPI function to lipoprotein metabolism.","evidence":"Genome-wide RNAi screen for fluorescent HDL uptake in Huh-7 cells with siRNA validation, surface receptor flow cytometry, apoA-I secretion and cholesterol efflux assays (preprint)","pmids":["bio_10.1101_2025.08.21.25332476"],"confidence":"Medium","gaps":["Mechanism by which COPG1 loss alters SR-BI glycosylation not directly shown","Opposing effects on SR-BI versus ABCA1 not mechanistically explained","Preprint not yet peer-reviewed"]},{"year":2026,"claim":"Connected COPG1-dependent Golgi/ER homeostasis to cancer cell survival, showing its loss triggers ER stress, ROS, and PI3K-AKT suppression that sensitizes tumor cells to chemotherapy.","evidence":"COPG1 knockdown in HCC cell lines with in vivo tumorigenicity, Golgi and ER stress markers, ROS, AKT signaling, and drug sensitivity assays","pmids":["41751842"],"confidence":"Medium","gaps":["Causal ordering of Golgi disruption, ER stress, ROS, and AKT suppression not resolved","Direct molecular targets connecting COPG1 to PI3K-AKT not identified","Single lab"]},{"year":null,"claim":"How COPG1, as a coatomer subunit, achieves cargo selectivity across these distinct contexts (lipoprotein receptors, viral NS1, pro-survival signaling components) remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural or biochemical map of COPG1 cargo recognition","No direct interactome reported in the corpus","Tissue-specific functions beyond hepatocytes and cancer cells uncharacterized"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,2]}],"complexes":["COPI coatomer"],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y678","full_name":"Coatomer subunit gamma-1","aliases":["Gamma-1-coat protein","Gamma-1-COP"],"length_aa":874,"mass_kda":97.7,"function":"The coatomer is a cytosolic protein complex that binds to dilysine motifs and reversibly associates with Golgi non-clathrin-coated vesicles, which further mediate biosynthetic protein transport from the ER, via the Golgi up to the trans Golgi network. Coatomer complex is required for budding from Golgi membranes, and is essential for the retrograde Golgi-to-ER transport of dilysine-tagged proteins. In mammals, the coatomer can only be recruited by membranes associated to ADP-ribosylation factors (ARFs), which are small GTP-binding proteins; the complex also influences the Golgi structural integrity, as well as the processing, activity, and endocytic recycling of LDL receptors. Required for limiting lipid storage in lipid droplets. Involved in lipid homeostasis by regulating the presence of perilipin family members PLIN2 and PLIN3 at the lipid droplet surface and promoting the association of adipocyte triglyceride lipase (PNPLA2) with the lipid droplet surface to mediate lipolysis (By similarity)","subcellular_location":"Cytoplasm; Golgi apparatus membrane; Cytoplasmic vesicle, COPI-coated vesicle membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y678/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/COPG1","classification":"Common Essential","n_dependent_lines":1104,"n_total_lines":1208,"dependency_fraction":0.9139072847682119},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000181789","cell_line_id":"CID000911","localizations":[{"compartment":"golgi","grade":3},{"compartment":"vesicles","grade":2},{"compartment":"cytoplasmic","grade":1}],"interactors":[{"gene":"COPA","stoichiometry":10.0},{"gene":"COPB2","stoichiometry":10.0},{"gene":"COPE","stoichiometry":10.0},{"gene":"COPB1","stoichiometry":10.0},{"gene":"COPZ1","stoichiometry":10.0},{"gene":"ARCN1","stoichiometry":10.0},{"gene":"NOLC1","stoichiometry":10.0},{"gene":"SCYL3","stoichiometry":0.2},{"gene":"ATL2","stoichiometry":0.2},{"gene":"GEMIN4","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000911","total_profiled":1310},"omim":[{"mim_id":"620983","title":"IMMUNODEFICIENCY 128; IMD128","url":"https://www.omim.org/entry/620983"},{"mim_id":"615526","title":"COATOMER PROTEIN COMPLEX, SUBUNIT ZETA-2; COPZ2","url":"https://www.omim.org/entry/615526"},{"mim_id":"615525","title":"COATOMER PROTEIN COMPLEX, SUBUNIT GAMMA-1; COPG1","url":"https://www.omim.org/entry/615525"},{"mim_id":"615472","title":"COATOMER PROTEIN COMPLEX, SUBUNIT ZETA-1; COPZ1","url":"https://www.omim.org/entry/615472"},{"mim_id":"606516","title":"MUSCLEBLIND-LIKE SPLICING REGULATOR 1; MBNL1","url":"https://www.omim.org/entry/606516"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/COPG1"},"hgnc":{"alias_symbol":[],"prev_symbol":["COPG"]},"alphafold":{"accession":"Q9Y678","domains":[{"cath_id":"-","chopping":"207-280","consensus_level":"medium","plddt":90.2754,"start":207,"end":280},{"cath_id":"2.60.40.1480","chopping":"611-758","consensus_level":"high","plddt":91.9276,"start":611,"end":758},{"cath_id":"3.30.310.10","chopping":"763-872","consensus_level":"high","plddt":90.0299,"start":763,"end":872},{"cath_id":"1.25.40","chopping":"446-548","consensus_level":"medium","plddt":92.3592,"start":446,"end":548}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y678","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y678-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y678-F1-predicted_aligned_error_v6.png","plddt_mean":87.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COPG1","jax_strain_url":"https://www.jax.org/strain/search?query=COPG1"},"sequence":{"accession":"Q9Y678","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y678.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y678/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y678"}},"corpus_meta":[{"pmid":"9857196","id":"PMC_9857196","title":"The structure of plasmid-encoded transcriptional repressor CopG unliganded and bound to its operator.","date":"1998","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/9857196","citation_count":144,"is_preprint":false},{"pmid":"8825095","id":"PMC_8825095","title":"Replication control of plasmid pLS1: efficient regulation of plasmid copy number is exerted by the combined action of two plasmid components, CopG and RNA II.","date":"1995","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/8825095","citation_count":64,"is_preprint":false},{"pmid":"19520770","id":"PMC_19520770","title":"Repressor CopG prevents access of RNA polymerase to promoter and actively dissociates open complexes.","date":"2009","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/19520770","citation_count":29,"is_preprint":false},{"pmid":"11428897","id":"PMC_11428897","title":"Plasmid transcriptional repressor CopG oligomerises to render helical superstructures unbound and in complexes with oligonucleotides.","date":"2001","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/11428897","citation_count":23,"is_preprint":false},{"pmid":"32571874","id":"PMC_32571874","title":"The bacterial copper resistance protein CopG contains a cysteine-bridged tetranuclear copper cluster.","date":"2020","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/32571874","citation_count":17,"is_preprint":false},{"pmid":"9714164","id":"PMC_9714164","title":"Structural features of the plasmid pMV158-encoded transcriptional repressor CopG, a protein sharing similarities with both helix-turn-helix and beta-sheet DNA binding proteins.","date":"1998","source":"Proteins","url":"https://pubmed.ncbi.nlm.nih.gov/9714164","citation_count":14,"is_preprint":false},{"pmid":"15169951","id":"PMC_15169951","title":"Facile chemical synthesis and equilibrium unfolding properties of CopG.","date":"2004","source":"Protein science : a publication of the Protein Society","url":"https://pubmed.ncbi.nlm.nih.gov/15169951","citation_count":7,"is_preprint":false},{"pmid":"9541028","id":"PMC_9541028","title":"Overexpression, purification, crystallization and preliminary X-ray diffraction analysis of the pMV158-encoded plasmid transcriptional repressor protein CopG.","date":"1998","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/9541028","citation_count":5,"is_preprint":false},{"pmid":"38927295","id":"PMC_38927295","title":"CopG1, a Novel Transcriptional Regulator Affecting Symbiosis in Bradyrhizobium sp. SUTN9-2.","date":"2024","source":"Biology","url":"https://pubmed.ncbi.nlm.nih.gov/38927295","citation_count":1,"is_preprint":false},{"pmid":"36637718","id":"PMC_36637718","title":"Structural Analyses of the Multicopper Site of CopG Support a Role as a Redox Enzyme.","date":"2023","source":"Advances in experimental medicine and biology","url":"https://pubmed.ncbi.nlm.nih.gov/36637718","citation_count":0,"is_preprint":false},{"pmid":"41751842","id":"PMC_41751842","title":"COPG1 Is a Selectively Essential Regulator of Cancer Progression and Chemoresistance via Redox Modulation and AKT Signaling.","date":"2026","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41751842","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.08.21.25332476","title":"The COPI coatomer regulates several steps of HDL metabolism","date":"2025-08-26","source":"bioRxiv","url":"https://doi.org/10.1101/2025.08.21.25332476","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.12.618008","title":"Coatomer protein complex I is required for efficient secretion of dengue virus non-structural protein 1","date":"2024-10-13","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.12.618008","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8808,"output_tokens":1418,"usd":0.023847,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7607,"output_tokens":1782,"usd":0.041293,"stage2_stop_reason":"end_turn"},"total_usd":0.06514,"stage1_batch_id":"msgbatch_0147LFpL5iCPFZF66xp23BqC","stage2_batch_id":"msgbatch_01Crtwc6eCsZh1CrnfJhY7J7","note":"batch pricing = 50% of standard"},"stage1_raw":"I need to carefully classify each paper before extracting discoveries.\n\n**Classification:**\n- Papers [1]-[4], [6]-[8]: These describe a bacterial plasmid-encoded transcriptional repressor \"CopG\" from streptococcal plasmid pMV158. This is NOT the human COPG1/COPG gene (which encodes a COPI coatomer complex subunit). These are symbol collisions (bacterial plasmid repressor vs. mammalian coatomer protein). **EXCLUDE.**\n- Paper [5]: Describes a bacterial copper resistance protein \"CopG\" from Pseudomonas aeruginosa. Symbol collision. **EXCLUDE.**\n- Paper [9]: Describes CopG1 as a transcriptional regulator in Bradyrhizobium sp. (a nitrogen-fixing bacterium). Symbol collision — completely different biological context. **EXCLUDE.**\n- Paper [10]: Reviews the bacterial copper resistance CopG protein. Symbol collision. **EXCLUDE.**\n- Paper [11]: COPG1 as a COPI coatomer subunit in human cancer/HCC — this IS the human COPG1. **INCLUDE.**\n- Paper [12]: COPI coatomer components including COPG1 in HDL metabolism in hepatocytes — this IS the human COPG1. **INCLUDE** (preprint).\n- Paper [13]: COPI coatomer components including COPG1 in dengue NS1 secretion — this IS the human COPG1. **INCLUDE** (preprint).\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2026,\n      \"finding\": \"COPG1 knockdown in hepatocellular carcinoma cells impaired malignant phenotypes and reduced tumorigenicity in vivo. Mechanistically, COPG1 depletion induced Golgi disruption and ER stress, increased reactive oxygen species (ROS) production, and suppressed PI3K-AKT signaling, thereby sensitizing cells to sorafenib and doxorubicin.\",\n      \"method\": \"COPG1 knockdown (loss-of-function) in HCC cell lines with in vivo tumorigenicity assay; measurement of Golgi morphology, ER stress markers, ROS production, and PI3K-AKT pathway activity; drug sensitivity assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with defined cellular phenotypes and multiple orthogonal readouts (Golgi disruption, ER stress, ROS, AKT signaling, in vivo), single lab\",\n      \"pmids\": [\"41751842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"COPG1 (as part of the COPI coatomer complex) is required in hepatocytes for HDL holoparticle uptake, selective HDL lipid uptake, and apoA-I secretion. Knockdown of COPG1 decreased cell-surface abundance of scavenger receptor SR-BI (likely via interference with SR-BI glycosylation) and decreased APOA1 expression, while increasing cell-surface ABCA1 abundance and ABCA1-mediated cholesterol efflux.\",\n      \"method\": \"Genome-wide RNAi screen in Huh-7 hepatocarcinoma cells for fluorescent HDL uptake, followed by targeted siRNA knockdown validation; flow cytometry for SR-BI and ABCA1 surface abundance; apoA-I secretion assay; cholesterol efflux assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide screen with targeted validation, multiple orthogonal cellular readouts, single lab, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.08.21.25332476\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"COPG1 (a COPI coatomer subunit) is required for efficient secretion of dengue virus non-structural protein 1 (NS1) from infected cells. siRNA knockdown of COPG1 in DENV-infected cells reduced NS1 secretion without affecting infectious virus egress. Similar effects were observed with West Nile virus, indicating a conserved role for COPI machinery in NS1 secretion across orthoflaviviruses.\",\n      \"method\": \"Customised membrane-trafficking siRNA screen; targeted siRNA knockdown in DENV- and WNV/KUNV-infected cells with NS1 secretion assays; heterologous expression of wildtype and pathogenic COPI variants; chemical inhibition studies\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA screen validated by targeted KD with multiple viral systems and orthogonal approaches, single lab, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.10.12.618008\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"COPG1, a subunit of the COPI coatomer complex, is required for Golgi-dependent vesicular trafficking processes including HDL holoparticle uptake and apoA-I secretion in hepatocytes (via regulation of SR-BI glycosylation and surface abundance), efficient dengue/West Nile virus NS1 protein secretion through the early secretory pathway, and maintenance of Golgi integrity and ER homeostasis in cancer cells where its loss suppresses PI3K-AKT signaling, increases ROS, and sensitizes cells to chemotherapy.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"COPG1 is a subunit of the COPI coatomer complex that supports Golgi-dependent vesicular trafficking and the integrity of the early secretory pathway [#1, #2]. In hepatocytes, COPG1 is required for HDL holoparticle uptake, selective HDL lipid uptake, and apoA-I secretion; its depletion lowers cell-surface abundance of the scavenger receptor SR-BI (via interference with SR-BI glycosylation) and reduces APOA1 expression, while raising surface ABCA1 and ABCA1-mediated cholesterol efflux [#1]. The same COPI trafficking machinery is exploited for efficient secretion of the flaviviral non-structural protein NS1, since COPG1 knockdown reduces NS1 secretion from dengue- and West Nile virus-infected cells without affecting infectious virus egress [#2]. In hepatocellular carcinoma cells, loss of COPG1 disrupts Golgi morphology and triggers ER stress, elevates reactive oxygen species, and suppresses PI3K-AKT signaling, impairing malignant phenotypes and sensitizing cells to sorafenib and doxorubicin [#0]. Beyond these trafficking and cancer-cell phenotypes, no further molecular detail of COPG1 has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2024,\n      \"claim\": \"Established that the COPI subunit COPG1 is selectively required for cellular secretion of flaviviral NS1, distinguishing host trafficking needs for protein secretion from those for virus egress.\",\n      \"evidence\": \"Membrane-trafficking siRNA screen and targeted knockdown in DENV- and WNV/KUNV-infected cells with NS1 secretion assays, plus expression of COPI variants and chemical inhibition (preprint)\",\n      \"pmids\": [\n        \"bio_10.1101_2024.10.12.618008\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct interaction between COPG1 and NS1 not demonstrated\",\n        \"Step in the secretory pathway where COPI acts on NS1 not resolved\",\n        \"Preprint not yet peer-reviewed\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified COPG1 as a hepatocyte trafficking factor controlling HDL uptake and apoA-I output through regulation of SR-BI and ABCA1 surface abundance, linking COPI function to lipoprotein metabolism.\",\n      \"evidence\": \"Genome-wide RNAi screen for fluorescent HDL uptake in Huh-7 cells with siRNA validation, surface receptor flow cytometry, apoA-I secretion and cholesterol efflux assays (preprint)\",\n      \"pmids\": [\n        \"bio_10.1101_2025.08.21.25332476\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which COPG1 loss alters SR-BI glycosylation not directly shown\",\n        \"Opposing effects on SR-BI versus ABCA1 not mechanistically explained\",\n        \"Preprint not yet peer-reviewed\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Connected COPG1-dependent Golgi/ER homeostasis to cancer cell survival, showing its loss triggers ER stress, ROS, and PI3K-AKT suppression that sensitizes tumor cells to chemotherapy.\",\n      \"evidence\": \"COPG1 knockdown in HCC cell lines with in vivo tumorigenicity, Golgi and ER stress markers, ROS, AKT signaling, and drug sensitivity assays\",\n      \"pmids\": [\n        \"41751842\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Causal ordering of Golgi disruption, ER stress, ROS, and AKT suppression not resolved\",\n        \"Direct molecular targets connecting COPG1 to PI3K-AKT not identified\",\n        \"Single lab\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How COPG1, as a coatomer subunit, achieves cargo selectivity across these distinct contexts (lipoprotein receptors, viral NS1, pro-survival signaling components) remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No structural or biochemical map of COPG1 cargo recognition\",\n        \"No direct interactome reported in the corpus\",\n        \"Tissue-specific functions beyond hepatocytes and cancer cells uncharacterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [\n      \"COPI coatomer\"\n    ],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win"}}