{"gene":"COPB1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2007,"finding":"COPB1 (β-COP) binds kappa opioid receptor (KOR) mRNA and is required for its axonal transport in dorsal root ganglia neurons. Yeast three-hybrid screening identified COPB1 as a KOR mRNA-associated protein; complexes of endogenous KOR mRNA and COPB1 were colocalized in soma and axons. Axonal transport of biotin-labeled KOR mRNA in Campenot chambers required COPB1 and was blocked by microtubule-disrupting drugs. COPB1 also facilitated local translation of KOR mRNA in soma and axons.","method":"Yeast three-hybrid screening, co-immunoprecipitation of endogenous complexes, Campenot chamber axonal transport assay with biotin-labeled mRNA, MS2-GFP mRNA-tagging system, microtubule disruption pharmacology","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (yeast 3-hybrid, endogenous co-IP, live transport assay, MS2-GFP tagging) in a single lab study","pmids":["17698811"],"is_preprint":false},{"year":2021,"finding":"Biallelic loss-of-function variants in COPB1 (encoding β-COP) cause a recessive neurodevelopmental syndrome (Baralle-Macken syndrome) with severe intellectual disability, cataracts, and variable microcephaly. A splice donor variant causes skipping of exon 8, producing a 36 amino acid in-frame deletion that disrupts a small interaction interface between β-COP and β'-COP. A missense variant (p.Phe551Val) causes defective Golgi-to-ER recycling, with the mutant β-COP retarded in the Golgi. CRISPR/Cas9 modelling of the homologous splice variant in Xenopus tropicalis recapitulated microcephaly and cataracts.","method":"Whole exome/genome sequencing, patient blood RNA studies, CRISPR/Cas9 modelling in Xenopus tropicalis, transfection of COPB1 expression vectors with missense mutation into human cell lines (RPE and HEK293), Golgi-to-ER recycling assays","journal":"Genome medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (patient RNA, Xenopus CRISPR in vivo model recapitulating phenotype, cell-based Golgi trafficking assay of missense mutant), two independent families, mechanistic pathway placement","pmids":["33632302"],"is_preprint":false},{"year":2020,"finding":"COPB1 physically interacts with OSBPL2 (ORP2) and ATGL, and OSBPL2 is required for COPB1-mediated transport of ATGL from the ER to the lipid droplet surface to regulate lipolysis. Loss of OSBPL2 disrupts the COPB1–ATGL interaction and impairs lipid droplet lipolysis.","method":"Co-immunoprecipitation, siRNA knockdown, lipid droplet phenotyping, Western blot","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP identifying binding partners replicated with functional KD assays, single lab","pmids":["32650117"],"is_preprint":false},{"year":1999,"finding":"Mouse β-COP (Copb) is ubiquitously expressed and its gene maps to mouse chromosome 7 at 53.3 cM. Western blotting confirmed protein expression. The Copb gene was excluded as a candidate for the ruby-eye-2 (ru2) locus (a Hermansky-Pudlak syndrome model) by RH mapping and sequencing of RT-PCR products.","method":"RT-PCR, radiation hybrid mapping, Western blotting, sequencing","journal":"Somatic cell and molecular genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — mapping and expression characterization with negative result for candidate gene; no functional mechanism established for the protein itself","pmids":["11441537"],"is_preprint":false},{"year":2025,"finding":"COPB1 deficiency in osteoblasts induces ferroptosis and endoplasmic reticulum stress. Mechanistically, loss of COPB1 activates ATF6-mediated ER stress signaling, which suppresses SLC7A11 transcription, reducing cystine uptake and triggering iron-dependent lipid peroxidation (ferroptosis). Co-immunoprecipitation and ChIP-seq confirmed COPB1 involvement in regulating ATF6-SLC7A11 axis. AAV-mediated COPB1 overexpression restored osteogenic function in osteoporosis mouse models.","method":"siRNA knockdown in MC3T3 cells, conditional knockout mice, RNA-seq, co-immunoprecipitation, ChIP-seq, transmission electron microscopy, flow cytometry, AAV overexpression in OVX and Hamp KO mouse models, Western blot, ALP/Alizarin Red staining","journal":"Journal of orthopaedic translation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP-seq, Co-IP, in vivo KO and rescue) in single lab study establishing pathway placement","pmids":["40206560"],"is_preprint":false},{"year":2025,"finding":"COPB1 knockdown prevents retrieval of STING from the Golgi back to the ER, thereby activating type I interferon signaling. This mechanism restricts intracellular Chlamydia psittaci proliferation, establishing COPB1 as required for STING homeostasis in the Golgi-ER retrograde trafficking pathway.","method":"siRNA library screen in HeLa cells with fluorescently labeled C. psittaci, targeted COPB1 knockdown, type I interferon pathway reporter assays, STING localization assays","journal":"Frontiers in microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional siRNA screen validated with targeted KD, localization assay, and pathway readout; single lab","pmids":["40115189"],"is_preprint":false},{"year":2025,"finding":"Knockdown of COPB1 (and five other COPI subunits) in Huh-7 hepatocytes decreased uptake of HDL holoparticles, reduced cell surface abundance of SR-BI (scavenger receptor BI), decreased APOA1 expression and apoA-I secretion, but increased cell surface ABCA1 abundance and cholesterol efflux. This places COPB1 as required for SR-BI glycosylation and surface trafficking, and for APOA1/apoA-I production in hepatocytes.","method":"Genome-wide RNAi screen, targeted siRNA knockdown validation, fluorescent HDL uptake assays, flow cytometry for surface receptor abundance, cholesterol efflux assays","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, genome-wide screen with replication; mechanistic depth is limited (no direct binding or structural validation); COPB1 is one of six co-equal COPI subunits tested","pmids":[],"is_preprint":true},{"year":2026,"finding":"Patients with homozygous COPB1 loss-of-function mutations exhibit combined immunodeficiency characterized by neutropenia, T cell lymphopenia, profound reduction in switched and unswitched memory B cells, and absent specific antibody responses, establishing a role for COPB1 in lymphocyte and immune cell development/function.","method":"Flow cytometry for lymphocyte subsets, cytokine secretion assays after stimulation, PBMC proliferation assays with dye labeling and CD3/CD28 activation","journal":"Frontiers in immunology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — clinical characterization of three siblings; functional immune assays performed but no molecular mechanism established for why COPB1 loss causes immunodeficiency","pmids":["41676145"],"is_preprint":false}],"current_model":"COPB1 encodes the β-COP subunit of the COPI coatomer complex and is required for retrograde Golgi-to-ER protein trafficking; loss-of-function mutations cause Baralle-Macken syndrome (intellectual disability, cataracts, microcephaly) by disrupting the β-COP/β'-COP interaction interface or by retaining mutant β-COP in the Golgi; COPB1 also facilitates microtubule-dependent axonal transport and local translation of KOR mRNA, regulates ATGL transport from ER to lipid droplets via interaction with OSBPL2, maintains STING retrograde trafficking from Golgi to ER (thereby controlling type I interferon signaling), and is required in osteoblasts where its deficiency triggers ATF6-mediated ER stress and SLC7A11 suppression leading to ferroptosis."},"narrative":{"mechanistic_narrative":"COPB1 encodes the β-COP subunit of the COPI coatomer and functions in retrograde Golgi-to-ER protein trafficking, where biallelic loss-of-function variants cause a recessive neurodevelopmental disorder (Baralle-Macken syndrome) with intellectual disability, cataracts, and microcephaly [PMID:33632302]. Two distinct mutational mechanisms operate: an in-frame deletion disrupts a small β-COP/β'-COP interaction interface, while a missense variant (p.Phe551Val) impairs Golgi-to-ER recycling and retains mutant β-COP in the Golgi, with the phenotype recapitulated by CRISPR modelling in Xenopus tropicalis [PMID:33632302]. Beyond its core coatomer role, COPB1 governs the localization of specific cargo through retrograde trafficking: it is required to retrieve STING from the Golgi back to the ER, and its depletion leaves STING in the Golgi to drive type I interferon signaling [PMID:40115189], and it mediates OSBPL2-dependent transport of ATGL from the ER to lipid droplets to support lipolysis [PMID:32650117]. COPB1 additionally binds kappa opioid receptor (KOR) mRNA and supports its microtubule-dependent axonal transport and local translation in sensory neurons [PMID:17698811]. In osteoblasts, COPB1 loss activates ATF6-mediated ER stress that suppresses SLC7A11 and triggers ferroptosis, and its restoration rescues osteogenic function in osteoporosis models [PMID:40206560].","teleology":[{"year":2007,"claim":"Established that β-COP has an RNA-associated role beyond coatomer assembly by showing it binds KOR mRNA and is required for its microtubule-dependent axonal transport and local translation.","evidence":"Yeast three-hybrid screen, endogenous co-IP, Campenot chamber transport assay, and MS2-GFP tagging in dorsal root ganglion neurons","pmids":["17698811"],"confidence":"Medium","gaps":["Whether mRNA binding is direct or coatomer-mediated is not resolved","The RNA-binding determinant on β-COP is not mapped","Single-lab study without independent replication"]},{"year":2020,"claim":"Defined a cargo-specific trafficking function by showing COPB1 transports ATGL from the ER to lipid droplets in an OSBPL2-dependent manner to regulate lipolysis.","evidence":"Co-immunoprecipitation, siRNA knockdown, and lipid droplet phenotyping","pmids":["32650117"],"confidence":"Medium","gaps":["Direct versus bridged COPB1-ATGL contact not distinguished","Structural basis of the OSBPL2 requirement unknown","Single-lab co-IP and knockdown evidence"]},{"year":2021,"claim":"Connected COPB1 to human disease and to its molecular interaction interface by demonstrating that biallelic loss-of-function variants cause Baralle-Macken syndrome through disrupted β-COP/β'-COP interaction or defective Golgi-to-ER recycling.","evidence":"Exome/genome sequencing in two families, patient RNA analysis, missense-mutant Golgi-to-ER recycling assays in human cells, and CRISPR/Cas9 Xenopus tropicalis modelling recapitulating microcephaly and cataracts","pmids":["33632302"],"confidence":"High","gaps":["How retrograde trafficking failure produces tissue-specific cataract and brain phenotypes is unresolved","No structural model of the disrupted β-COP/β'-COP interface","Genotype-phenotype correlation across allele types not defined"]},{"year":2025,"claim":"Identified a specific retrograde cargo with signaling consequences by showing COPB1 retrieves STING from Golgi to ER, thereby restraining type I interferon output and intracellular pathogen growth.","evidence":"siRNA library screen in HeLa cells against fluorescent C. psittaci, targeted knockdown, STING localization assays, and interferon reporter assays","pmids":["40115189"],"confidence":"Medium","gaps":["Direct COPB1-STING contact not demonstrated","Whether STING retrieval is selective or a bulk consequence of coatomer loss is unclear","Single-lab screen"]},{"year":2025,"claim":"Placed COPB1 in an osteoblast survival pathway by showing its deficiency activates ATF6-mediated ER stress that suppresses SLC7A11 and triggers ferroptosis, with overexpression rescuing osteogenesis in vivo.","evidence":"siRNA knockdown in MC3T3 cells, conditional knockout mice, RNA-seq, co-IP, ChIP-seq, and AAV overexpression in OVX and Hamp KO models","pmids":["40206560"],"confidence":"Medium","gaps":["Mechanistic link between trafficking defect and ATF6 activation not detailed","Whether the ferroptosis axis is osteoblast-specific is untested","Single-lab study"]},{"year":2026,"claim":"Extended the COPB1 disease phenotype by documenting combined immunodeficiency with neutropenia, T cell lymphopenia, and memory B-cell loss in patients with homozygous loss-of-function mutations.","evidence":"Flow cytometry of lymphocyte subsets, cytokine secretion assays, and PBMC proliferation assays in three affected siblings","pmids":["41676145"],"confidence":"Low","gaps":["No molecular mechanism linking COPB1 loss to immune cell defects established","Limited to three siblings without functional rescue","Relationship to the neurodevelopmental phenotype unclear"]},{"year":null,"claim":"How a single coatomer subunit selectively governs distinct cargoes (STING, ATGL, KOR mRNA, SR-BI) and produces tissue-specific disease phenotypes remains the central open question.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model unifying cargo selectivity","Mechanism of tissue-specific vulnerability unexplained","Direct versus indirect cargo binding undefined across substrates"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[1,5]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1,2,5]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,5]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[1,2,5]}],"complexes":["COPI coatomer"],"partners":["COPB2","OSBPL2","ATGL","STING","ATF6"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P53618","full_name":"Coatomer subunit beta","aliases":["Beta-coat protein","Beta-COP"],"length_aa":953,"mass_kda":107.1,"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. Plays a functional role in facilitating the transport of kappa-type opioid receptor mRNAs into axons and enhances translation of these proteins. 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 surface triglyceride lipase (PNPLA2) with the lipid droplet to mediate lipolysis (By similarity). Involved in the Golgi disassembly and reassembly processes during cell cycle. Involved in autophagy by playing a role in early endosome function. Plays a role in organellar compartmentalization of secretory compartments including endoplasmic reticulum (ER)-Golgi intermediate compartment (ERGIC), Golgi, trans-Golgi network (TGN) and recycling endosomes, and in biosynthetic transport of CAV1. Promotes degradation of Nef cellular targets CD4 and MHC class I antigens by facilitating their trafficking to degradative compartments","subcellular_location":"Cytoplasm; Golgi apparatus membrane; Cytoplasmic vesicle, COPI-coated vesicle membrane; Cell membrane; Endoplasmic reticulum-Golgi intermediate compartment","url":"https://www.uniprot.org/uniprotkb/P53618/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/COPB1","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"COPA","stoichiometry":10.0},{"gene":"COPB2","stoichiometry":10.0},{"gene":"COPE","stoichiometry":10.0},{"gene":"COPG1","stoichiometry":10.0},{"gene":"SPTLC1","stoichiometry":4.0},{"gene":"CANX","stoichiometry":0.2},{"gene":"PPM1G","stoichiometry":0.2},{"gene":"SCYL1","stoichiometry":0.2},{"gene":"SEC61B","stoichiometry":0.2},{"gene":"VAPA","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/COPB1","total_profiled":1310},"omim":[{"mim_id":"619255","title":"BARALLE-MACKEN SYNDROME; BARMACS","url":"https://www.omim.org/entry/619255"},{"mim_id":"618777","title":"CALPAIN 8; CAPN8","url":"https://www.omim.org/entry/618777"},{"mim_id":"617852","title":"SEC23-INTERACTING PROTEIN; SEC23IP","url":"https://www.omim.org/entry/617852"},{"mim_id":"616448","title":"RAS-ASSOCIATED PROTEIN RAB12; RAB12","url":"https://www.omim.org/entry/616448"},{"mim_id":"606990","title":"COATOMER PROTEIN COMPLEX, SUBUNIT BETA-2; COPB2","url":"https://www.omim.org/entry/606990"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Golgi apparatus","reliability":"Enhanced"},{"location":"Vesicles","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/COPB1"},"hgnc":{"alias_symbol":[],"prev_symbol":["COPB"]},"alphafold":{"accession":"P53618","domains":[{"cath_id":"2.60.40.1480","chopping":"711-825","consensus_level":"high","plddt":82.9151,"start":711,"end":825},{"cath_id":"3.30.310.10","chopping":"829-948","consensus_level":"high","plddt":83.9879,"start":829,"end":948},{"cath_id":"1.20.930","chopping":"349-453","consensus_level":"medium","plddt":84.9497,"start":349,"end":453},{"cath_id":"1.20.58","chopping":"467-495_540-624","consensus_level":"medium","plddt":91.4025,"start":467,"end":624}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P53618","model_url":"https://alphafold.ebi.ac.uk/files/AF-P53618-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P53618-F1-predicted_aligned_error_v6.png","plddt_mean":82.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COPB1","jax_strain_url":"https://www.jax.org/strain/search?query=COPB1"},"sequence":{"accession":"P53618","fasta_url":"https://rest.uniprot.org/uniprotkb/P53618.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P53618/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P53618"}},"corpus_meta":[{"pmid":"12876283","id":"PMC_12876283","title":"Archaeoglobus 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one","url":"https://pubmed.ncbi.nlm.nih.gov/29864148","citation_count":6,"is_preprint":false},{"pmid":"22663904","id":"PMC_22663904","title":"Conformations of the apo-, substrate-bound and phosphate-bound ATP-binding domain of the Cu(II) ATPase CopB illustrate coupling of domain movement to the catalytic cycle.","date":"2012","source":"Bioscience reports","url":"https://pubmed.ncbi.nlm.nih.gov/22663904","citation_count":6,"is_preprint":false},{"pmid":"39608619","id":"PMC_39608619","title":"Isolation and crystallization of copper resistance protein B (CopB) from Acinetobacter baumannii.","date":"2024","source":"Protein expression and purification","url":"https://pubmed.ncbi.nlm.nih.gov/39608619","citation_count":3,"is_preprint":false},{"pmid":"24234674","id":"PMC_24234674","title":"Investigation of four candidate genes (IGF2, JHDM1A, COPB1 and TEF1) for growth rate and backfat thickness traits on SSC2q in Large White pigs.","date":"2014","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/24234674","citation_count":3,"is_preprint":false},{"pmid":"40396222","id":"PMC_40396222","title":"Exploring Baralle-Macken Syndrome: A Novel COPB1 Mutation in Consanguineous Pakistani Siblings.","date":"2025","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/40396222","citation_count":2,"is_preprint":false},{"pmid":"40115189","id":"PMC_40115189","title":"COPB1-knockdown induced type I interferon signaling activation inhibits Chlamydia psittaci intracellular proliferation.","date":"2025","source":"Frontiers in microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/40115189","citation_count":2,"is_preprint":false},{"pmid":"11441537","id":"PMC_11441537","title":"cDNA sequence and mapping of the mouse Copb gene encoding the beta subunit of the COPI coatomer complex.","date":"1999","source":"Somatic cell and molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11441537","citation_count":1,"is_preprint":false},{"pmid":"41676145","id":"PMC_41676145","title":"Expanding the clinical and immunological phenotypes of COPB1 deficiency.","date":"2026","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/41676145","citation_count":0,"is_preprint":false},{"pmid":"2325626","id":"PMC_2325626","title":"Comparison of the CopB systems of plasmids R1 and ColV2-K94: a single base alteration in CopB gene is responsible for the increased copy number of the low copy number plasmid ColV2-K94.","date":"1990","source":"Molecular & general genetics : MGG","url":"https://pubmed.ncbi.nlm.nih.gov/2325626","citation_count":0,"is_preprint":false},{"pmid":"42074526","id":"PMC_42074526","title":"The copB Is a Key Copper Resistance Gene in Xanthomonas citri pv. mangiferaeindicae GXBS06.","date":"2026","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/42074526","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_2025.03.28.645966","title":"A global perspective on the genomics of Moraxella catarrhalis","date":"2025-03-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.28.645966","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":19114,"output_tokens":2860,"usd":0.050121,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9691,"output_tokens":2692,"usd":0.057877,"stage2_stop_reason":"end_turn"},"total_usd":0.107998,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify papers about the human/mammalian COPB1 gene (beta-COP subunit of the COPI coatomer complex). Let me classify each paper:\n\n- Papers [1-8, 10, 14-15, 17, 22, 25-27, 33-34]: These describe bacterial/archaeal CopB proteins (copper ATPases, plasmid replication control proteins) — these are symbol collisions, not orthologs of human COPB1.\n- Papers [2, 5, 13, 16, 20, 23, 36]: Moraxella/Chlamydia CopB — bacterial proteins, symbol collisions.\n- Paper [24]: Chemistry/materials science CoPB — not biological gene.\n- Papers [3, 9, 11, 21, 29, 30, 31, 32, 35]: These are about the human/mammalian COPB1 (COPI coatomer beta subunit) — INCLUDE.\n- Papers [12, 28]: Porcine COPB1 mapping/expression studies — mostly QTL/expression, no mechanism.\n- Paper [19]: Pan-cancer expression analysis — EXCLUDE (expression/biomarker only).\n\nNow extracting mechanistic discoveries from the relevant papers [3, 9, 11, 21, 29, 30, 31, 32, 35]:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"COPB1 (β-COP) binds kappa opioid receptor (KOR) mRNA and is required for its axonal transport in dorsal root ganglia neurons. Yeast three-hybrid screening identified COPB1 as a KOR mRNA-associated protein; complexes of endogenous KOR mRNA and COPB1 were colocalized in soma and axons. Axonal transport of biotin-labeled KOR mRNA in Campenot chambers required COPB1 and was blocked by microtubule-disrupting drugs. COPB1 also facilitated local translation of KOR mRNA in soma and axons.\",\n      \"method\": \"Yeast three-hybrid screening, co-immunoprecipitation of endogenous complexes, Campenot chamber axonal transport assay with biotin-labeled mRNA, MS2-GFP mRNA-tagging system, microtubule disruption pharmacology\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (yeast 3-hybrid, endogenous co-IP, live transport assay, MS2-GFP tagging) in a single lab study\",\n      \"pmids\": [\"17698811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Biallelic loss-of-function variants in COPB1 (encoding β-COP) cause a recessive neurodevelopmental syndrome (Baralle-Macken syndrome) with severe intellectual disability, cataracts, and variable microcephaly. A splice donor variant causes skipping of exon 8, producing a 36 amino acid in-frame deletion that disrupts a small interaction interface between β-COP and β'-COP. A missense variant (p.Phe551Val) causes defective Golgi-to-ER recycling, with the mutant β-COP retarded in the Golgi. CRISPR/Cas9 modelling of the homologous splice variant in Xenopus tropicalis recapitulated microcephaly and cataracts.\",\n      \"method\": \"Whole exome/genome sequencing, patient blood RNA studies, CRISPR/Cas9 modelling in Xenopus tropicalis, transfection of COPB1 expression vectors with missense mutation into human cell lines (RPE and HEK293), Golgi-to-ER recycling assays\",\n      \"journal\": \"Genome medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (patient RNA, Xenopus CRISPR in vivo model recapitulating phenotype, cell-based Golgi trafficking assay of missense mutant), two independent families, mechanistic pathway placement\",\n      \"pmids\": [\"33632302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"COPB1 physically interacts with OSBPL2 (ORP2) and ATGL, and OSBPL2 is required for COPB1-mediated transport of ATGL from the ER to the lipid droplet surface to regulate lipolysis. Loss of OSBPL2 disrupts the COPB1–ATGL interaction and impairs lipid droplet lipolysis.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, lipid droplet phenotyping, Western blot\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP identifying binding partners replicated with functional KD assays, single lab\",\n      \"pmids\": [\"32650117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Mouse β-COP (Copb) is ubiquitously expressed and its gene maps to mouse chromosome 7 at 53.3 cM. Western blotting confirmed protein expression. The Copb gene was excluded as a candidate for the ruby-eye-2 (ru2) locus (a Hermansky-Pudlak syndrome model) by RH mapping and sequencing of RT-PCR products.\",\n      \"method\": \"RT-PCR, radiation hybrid mapping, Western blotting, sequencing\",\n      \"journal\": \"Somatic cell and molecular genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mapping and expression characterization with negative result for candidate gene; no functional mechanism established for the protein itself\",\n      \"pmids\": [\"11441537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"COPB1 deficiency in osteoblasts induces ferroptosis and endoplasmic reticulum stress. Mechanistically, loss of COPB1 activates ATF6-mediated ER stress signaling, which suppresses SLC7A11 transcription, reducing cystine uptake and triggering iron-dependent lipid peroxidation (ferroptosis). Co-immunoprecipitation and ChIP-seq confirmed COPB1 involvement in regulating ATF6-SLC7A11 axis. AAV-mediated COPB1 overexpression restored osteogenic function in osteoporosis mouse models.\",\n      \"method\": \"siRNA knockdown in MC3T3 cells, conditional knockout mice, RNA-seq, co-immunoprecipitation, ChIP-seq, transmission electron microscopy, flow cytometry, AAV overexpression in OVX and Hamp KO mouse models, Western blot, ALP/Alizarin Red staining\",\n      \"journal\": \"Journal of orthopaedic translation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP-seq, Co-IP, in vivo KO and rescue) in single lab study establishing pathway placement\",\n      \"pmids\": [\"40206560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"COPB1 knockdown prevents retrieval of STING from the Golgi back to the ER, thereby activating type I interferon signaling. This mechanism restricts intracellular Chlamydia psittaci proliferation, establishing COPB1 as required for STING homeostasis in the Golgi-ER retrograde trafficking pathway.\",\n      \"method\": \"siRNA library screen in HeLa cells with fluorescently labeled C. psittaci, targeted COPB1 knockdown, type I interferon pathway reporter assays, STING localization assays\",\n      \"journal\": \"Frontiers in microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional siRNA screen validated with targeted KD, localization assay, and pathway readout; single lab\",\n      \"pmids\": [\"40115189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Knockdown of COPB1 (and five other COPI subunits) in Huh-7 hepatocytes decreased uptake of HDL holoparticles, reduced cell surface abundance of SR-BI (scavenger receptor BI), decreased APOA1 expression and apoA-I secretion, but increased cell surface ABCA1 abundance and cholesterol efflux. This places COPB1 as required for SR-BI glycosylation and surface trafficking, and for APOA1/apoA-I production in hepatocytes.\",\n      \"method\": \"Genome-wide RNAi screen, targeted siRNA knockdown validation, fluorescent HDL uptake assays, flow cytometry for surface receptor abundance, cholesterol efflux assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, genome-wide screen with replication; mechanistic depth is limited (no direct binding or structural validation); COPB1 is one of six co-equal COPI subunits tested\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Patients with homozygous COPB1 loss-of-function mutations exhibit combined immunodeficiency characterized by neutropenia, T cell lymphopenia, profound reduction in switched and unswitched memory B cells, and absent specific antibody responses, establishing a role for COPB1 in lymphocyte and immune cell development/function.\",\n      \"method\": \"Flow cytometry for lymphocyte subsets, cytokine secretion assays after stimulation, PBMC proliferation assays with dye labeling and CD3/CD28 activation\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — clinical characterization of three siblings; functional immune assays performed but no molecular mechanism established for why COPB1 loss causes immunodeficiency\",\n      \"pmids\": [\"41676145\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"COPB1 encodes the β-COP subunit of the COPI coatomer complex and is required for retrograde Golgi-to-ER protein trafficking; loss-of-function mutations cause Baralle-Macken syndrome (intellectual disability, cataracts, microcephaly) by disrupting the β-COP/β'-COP interaction interface or by retaining mutant β-COP in the Golgi; COPB1 also facilitates microtubule-dependent axonal transport and local translation of KOR mRNA, regulates ATGL transport from ER to lipid droplets via interaction with OSBPL2, maintains STING retrograde trafficking from Golgi to ER (thereby controlling type I interferon signaling), and is required in osteoblasts where its deficiency triggers ATF6-mediated ER stress and SLC7A11 suppression leading to ferroptosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"COPB1 encodes the β-COP subunit of the COPI coatomer and functions in retrograde Golgi-to-ER protein trafficking, where biallelic loss-of-function variants cause a recessive neurodevelopmental disorder (Baralle-Macken syndrome) with intellectual disability, cataracts, and microcephaly [#1]. Two distinct mutational mechanisms operate: an in-frame deletion disrupts a small β-COP/β'-COP interaction interface, while a missense variant (p.Phe551Val) impairs Golgi-to-ER recycling and retains mutant β-COP in the Golgi, with the phenotype recapitulated by CRISPR modelling in Xenopus tropicalis [#1]. Beyond its core coatomer role, COPB1 governs the localization of specific cargo through retrograde trafficking: it is required to retrieve STING from the Golgi back to the ER, and its depletion leaves STING in the Golgi to drive type I interferon signaling [#5], and it mediates OSBPL2-dependent transport of ATGL from the ER to lipid droplets to support lipolysis [#2]. COPB1 additionally binds kappa opioid receptor (KOR) mRNA and supports its microtubule-dependent axonal transport and local translation in sensory neurons [#0]. In osteoblasts, COPB1 loss activates ATF6-mediated ER stress that suppresses SLC7A11 and triggers ferroptosis, and its restoration rescues osteogenic function in osteoporosis models [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that β-COP has an RNA-associated role beyond coatomer assembly by showing it binds KOR mRNA and is required for its microtubule-dependent axonal transport and local translation.\",\n      \"evidence\": \"Yeast three-hybrid screen, endogenous co-IP, Campenot chamber transport assay, and MS2-GFP tagging in dorsal root ganglion neurons\",\n      \"pmids\": [\"17698811\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether mRNA binding is direct or coatomer-mediated is not resolved\",\n        \"The RNA-binding determinant on β-COP is not mapped\",\n        \"Single-lab study without independent replication\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a cargo-specific trafficking function by showing COPB1 transports ATGL from the ER to lipid droplets in an OSBPL2-dependent manner to regulate lipolysis.\",\n      \"evidence\": \"Co-immunoprecipitation, siRNA knockdown, and lipid droplet phenotyping\",\n      \"pmids\": [\"32650117\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct versus bridged COPB1-ATGL contact not distinguished\",\n        \"Structural basis of the OSBPL2 requirement unknown\",\n        \"Single-lab co-IP and knockdown evidence\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected COPB1 to human disease and to its molecular interaction interface by demonstrating that biallelic loss-of-function variants cause Baralle-Macken syndrome through disrupted β-COP/β'-COP interaction or defective Golgi-to-ER recycling.\",\n      \"evidence\": \"Exome/genome sequencing in two families, patient RNA analysis, missense-mutant Golgi-to-ER recycling assays in human cells, and CRISPR/Cas9 Xenopus tropicalis modelling recapitulating microcephaly and cataracts\",\n      \"pmids\": [\"33632302\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How retrograde trafficking failure produces tissue-specific cataract and brain phenotypes is unresolved\",\n        \"No structural model of the disrupted β-COP/β'-COP interface\",\n        \"Genotype-phenotype correlation across allele types not defined\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a specific retrograde cargo with signaling consequences by showing COPB1 retrieves STING from Golgi to ER, thereby restraining type I interferon output and intracellular pathogen growth.\",\n      \"evidence\": \"siRNA library screen in HeLa cells against fluorescent C. psittaci, targeted knockdown, STING localization assays, and interferon reporter assays\",\n      \"pmids\": [\"40115189\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct COPB1-STING contact not demonstrated\",\n        \"Whether STING retrieval is selective or a bulk consequence of coatomer loss is unclear\",\n        \"Single-lab screen\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed COPB1 in an osteoblast survival pathway by showing its deficiency activates ATF6-mediated ER stress that suppresses SLC7A11 and triggers ferroptosis, with overexpression rescuing osteogenesis in vivo.\",\n      \"evidence\": \"siRNA knockdown in MC3T3 cells, conditional knockout mice, RNA-seq, co-IP, ChIP-seq, and AAV overexpression in OVX and Hamp KO models\",\n      \"pmids\": [\"40206560\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanistic link between trafficking defect and ATF6 activation not detailed\",\n        \"Whether the ferroptosis axis is osteoblast-specific is untested\",\n        \"Single-lab study\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extended the COPB1 disease phenotype by documenting combined immunodeficiency with neutropenia, T cell lymphopenia, and memory B-cell loss in patients with homozygous loss-of-function mutations.\",\n      \"evidence\": \"Flow cytometry of lymphocyte subsets, cytokine secretion assays, and PBMC proliferation assays in three affected siblings\",\n      \"pmids\": [\"41676145\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No molecular mechanism linking COPB1 loss to immune cell defects established\",\n        \"Limited to three siblings without functional rescue\",\n        \"Relationship to the neurodevelopmental phenotype unclear\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single coatomer subunit selectively governs distinct cargoes (STING, ATGL, KOR mRNA, SR-BI) and produces tissue-specific disease phenotypes remains the central open question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model unifying cargo selectivity\",\n        \"Mechanism of tissue-specific vulnerability unexplained\",\n        \"Direct versus indirect cargo binding undefined across substrates\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 2, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [1, 2, 5]}\n    ],\n    \"complexes\": [\"COPI coatomer\"],\n    \"partners\": [\"COPB2\", \"OSBPL2\", \"ATGL\", \"STING\", \"ATF6\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}