{"gene":"COPZ2","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2011,"finding":"COPZ2 encodes a subunit (ζ2) of the COPI coatomer protein complex involved in intracellular trafficking and autophagy. Knockdown of COPZ2 alone (unlike COPZ1 knockdown) did not cause Golgi collapse, autophagy block, or apoptosis in tumor cells; however, simultaneous knockdown of both COPZ1 and COPZ2 was required to inhibit normal cell growth, indicating functional redundancy between the two paralogs.","method":"siRNA knockdown, cell viability assays, Golgi morphology assessment, autophagy assays, apoptosis assays in tumor vs. normal cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays (Golgi morphology, autophagy, apoptosis, growth inhibition) with siRNA knockdown in both tumor and normal cells; key findings replicated across different cell types","pmids":["21746916"],"is_preprint":false},{"year":2011,"finding":"COPZ2 gene silencing in tumor cells renders them dependent on the paralog COPZ1 for survival. Re-expression of COPZ2 in tumor cells protected them from cell death caused by COPZ1 knockdown, establishing that tumor-specific COPZ2 silencing is the mechanistic basis for COPZ1 dependency.","method":"COPZ2 re-expression rescue experiment, COPZ1 siRNA knockdown, cell viability/apoptosis assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — rescue-by-re-expression is a rigorous epistasis approach; multiple cell lines tested with consistent results in one focused study","pmids":["21746916"],"is_preprint":false},{"year":2011,"finding":"COPZ2 harbors miR-152 within its intronic sequence, and COPZ2 is co-silenced with miR-152 in tumor cells via DNA hypermethylation. However, COPZ2 itself displays no tumor-suppressive activity; the tumor suppressor function is attributed to miR-152, not the COPZ2 protein.","method":"DNA methylation analysis, expression profiling of COPZ2 and miR-152 in tumor cell lines and clinical samples, functional assays separating COPZ2 and miR-152 activities","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct experimental separation of COPZ2 protein function from miR-152 function in a single focused study; no independent replication of the 'no tumor suppressor activity' negative finding","pmids":["21746916"],"is_preprint":false},{"year":2016,"finding":"Hypoxia reduces COPZ2 expression (along with other COPI coatomer genes) in mouse beta cells, and this reduction is associated with decreased ER-to-Golgi protein trafficking. JNK inhibition restored COPZ2/COPI gene expression and ER-to-Golgi trafficking, placing COPZ2 regulation downstream of JNK activation under hypoxic stress.","method":"siRNA knockdown of pathway components, JNK inhibitor treatment, ER-to-Golgi trafficking assays, qPCR for gene expression in mouse islets and MIN6 cells","journal":"Diabetologia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic/pharmacological epistasis with functional trafficking readout; COPZ2 is one of several COPI genes measured, not exclusively studied, in a single lab study","pmids":["27039902"],"is_preprint":false},{"year":2025,"finding":"Transduction of COPZ2 into COPZ1-mutated human CD34+ cells restored defective granulopoiesis, demonstrating that COPZ2 can functionally compensate for loss of COPZ1 in hematopoietic differentiation.","method":"Lentiviral transduction of COPZ2 into CD34+ cells with COPZ1 mutations; granulocytic differentiation assays","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — rescue experiment with defined cellular phenotype (granulopoiesis restoration); single study, human primary cells","pmids":["39642330"],"is_preprint":false}],"current_model":"COPZ2 encodes the ζ2 subunit of the COPI coatomer complex involved in ER-to-Golgi vesicular trafficking and autophagy; it is functionally redundant with its paralog COPZ1 in normal cells, such that tumor-specific silencing of COPZ2 (via DNA hypermethylation, co-silencing with the intronic miR-152) renders tumor cells uniquely dependent on COPZ1 for Golgi integrity, autophagy, and survival, and COPZ2 re-expression can rescue cells from COPZ1 loss-of-function including restoration of granulopoiesis in COPZ1-mutant hematopoietic cells."},"narrative":{"mechanistic_narrative":"COPZ2 encodes the ζ2 subunit of the COPI coatomer complex that mediates intracellular vesicular trafficking and autophagy [PMID:21746916]. It is functionally redundant with its paralog COPZ1: knockdown of COPZ2 alone does not cause Golgi collapse, autophagy block, or apoptosis, but simultaneous loss of both paralogs is required to impair normal cell growth [PMID:21746916]. This redundancy becomes therapeutically relevant when COPZ2 is silenced—as occurs in tumor cells—rendering those cells uniquely dependent on COPZ1, such that re-expression of COPZ2 rescues them from COPZ1 knockdown-induced death [PMID:21746916], and transduction of COPZ2 into COPZ1-mutant human CD34+ cells restores defective granulopoiesis [PMID:39642330]. COPZ2 expression is itself stress-regulated: hypoxia lowers COPZ2 and other COPI coatomer genes downstream of JNK activation, with a corresponding decline in ER-to-Golgi trafficking [PMID:27039902]. The COPZ2 locus harbors miR-152 within an intron, and the two are co-silenced via DNA hypermethylation, but the tumor-suppressive activity maps to miR-152 rather than the COPZ2 protein [PMID:21746916].","teleology":[{"year":2011,"claim":"Established that COPZ2 is a COPI coatomer ζ subunit functionally redundant with COPZ1, resolving why its individual loss is phenotypically silent while combined paralog loss disrupts cell growth.","evidence":"siRNA knockdown with Golgi morphology, autophagy, apoptosis, and viability readouts in tumor and normal cells","pmids":["21746916"],"confidence":"High","gaps":["No structural or biochemical demonstration of COPZ2 incorporation into the coatomer","Mechanism distinguishing COPZ1 vs COPZ2 contribution to specific cargo trafficking unknown"]},{"year":2011,"claim":"Showed that tumor-specific COPZ2 silencing is the mechanistic basis for COPZ1 dependency, since COPZ2 re-expression protects tumor cells from COPZ1 knockdown.","evidence":"COPZ2 re-expression rescue with COPZ1 siRNA and viability/apoptosis assays across multiple cell lines","pmids":["21746916"],"confidence":"High","gaps":["Does not define the trafficking cargoes whose loss kills COPZ2-silenced cells","In vivo therapeutic window of COPZ1 targeting not established here"]},{"year":2011,"claim":"Distinguished the COPZ2 protein from its intronic miR-152, attributing the locus's tumor-suppressor activity to the microRNA rather than the protein.","evidence":"DNA methylation and expression profiling with functional separation of COPZ2 and miR-152 activities in tumor lines and clinical samples","pmids":["21746916"],"confidence":"Medium","gaps":["Negative finding (no COPZ2 tumor-suppressor activity) not independently replicated","Regulatory coupling between COPZ2 transcription and miR-152 maturation not detailed"]},{"year":2016,"claim":"Placed COPZ2 regulation downstream of JNK under hypoxic stress, linking coatomer gene expression to ER-to-Golgi trafficking capacity.","evidence":"JNK inhibition, siRNA, and ER-to-Golgi trafficking assays with qPCR in mouse islets and MIN6 cells","pmids":["27039902"],"confidence":"Medium","gaps":["COPZ2 measured among several COPI genes, not isolated","Direct transcriptional mechanism of JNK-dependent COPZ2 repression unknown"]},{"year":2025,"claim":"Extended COPZ2-COPZ1 redundancy to hematopoiesis by showing COPZ2 can compensate for COPZ1 mutation to restore granulopoiesis.","evidence":"Lentiviral COPZ2 transduction into COPZ1-mutant human CD34+ cells with granulocytic differentiation assays","pmids":["39642330"],"confidence":"Medium","gaps":["Single study in primary cells without reciprocal validation","Molecular basis of COPZ1 requirement during granulopoiesis not defined"]},{"year":null,"claim":"It remains unknown how COPZ1 and COPZ2 differ at the level of cargo selectivity or coatomer assembly, and what dictates tissue- and tumor-specific silencing of COPZ2.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of COPZ2-containing coatomer","Substrate/cargo specificity distinguishing the paralogs undefined","Regulators of COPZ2 epigenetic silencing beyond DNA hypermethylation unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,3]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,3]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0]}],"complexes":["COPI coatomer"],"partners":["COPZ1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9P299","full_name":"Coatomer subunit zeta-2","aliases":["Zeta-2-coat protein","Zeta-2 COP"],"length_aa":210,"mass_kda":23.5,"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. The zeta subunit may be involved in regulating the coat assembly and, hence, the rate of biosynthetic protein transport due to its association-dissociation properties with the coatomer complex","subcellular_location":"Cytoplasm; Endoplasmic reticulum-Golgi intermediate compartment membrane; Golgi apparatus membrane; Cytoplasmic vesicle, COPI-coated vesicle membrane","url":"https://www.uniprot.org/uniprotkb/Q9P299/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/COPZ2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":74,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/COPZ2","total_profiled":1310},"omim":[{"mim_id":"621439","title":"NEUTROPENIA, SEVERE CONGENITAL, 12, AUTOSOMAL RECESSIVE; SCN12","url":"https://www.omim.org/entry/621439"},{"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":"604355","title":"COATOMER PROTEIN COMPLEX, SUBUNIT GAMMA-2; COPG2","url":"https://www.omim.org/entry/604355"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/COPZ2"},"hgnc":{"alias_symbol":["MGC23008"],"prev_symbol":[]},"alphafold":{"accession":"Q9P299","domains":[{"cath_id":"3.30.450.60","chopping":"45-178","consensus_level":"medium","plddt":96.1734,"start":45,"end":178}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P299","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P299-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P299-F1-predicted_aligned_error_v6.png","plddt_mean":83.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COPZ2","jax_strain_url":"https://www.jax.org/strain/search?query=COPZ2"},"sequence":{"accession":"Q9P299","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9P299.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9P299/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P299"}},"corpus_meta":[{"pmid":"21868754","id":"PMC_21868754","title":"miR-152 is a tumor suppressor microRNA that is silenced by DNA hypermethylation in endometrial cancer.","date":"2011","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/21868754","citation_count":188,"is_preprint":false},{"pmid":"27039902","id":"PMC_27039902","title":"Hypoxia reduces ER-to-Golgi protein trafficking and increases cell death by inhibiting the adaptive unfolded protein response in mouse beta cells.","date":"2016","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/27039902","citation_count":72,"is_preprint":false},{"pmid":"26155421","id":"PMC_26155421","title":"Clinical relevance of miR-mediated HLA-G regulation and the associated immune cell infiltration in renal cell carcinoma.","date":"2015","source":"Oncoimmunology","url":"https://pubmed.ncbi.nlm.nih.gov/26155421","citation_count":66,"is_preprint":false},{"pmid":"21746916","id":"PMC_21746916","title":"Tumor-specific silencing of COPZ2 gene encoding coatomer protein complex subunit ζ 2 renders tumor cells dependent on its paralogous gene COPZ1.","date":"2011","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/21746916","citation_count":45,"is_preprint":false},{"pmid":"30718281","id":"PMC_30718281","title":"The interplay of the metallosensor CueR with two distinct CopZ chaperones defines copper homeostasis in Pseudomonas aeruginosa.","date":"2019","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30718281","citation_count":35,"is_preprint":false},{"pmid":"37551622","id":"PMC_37551622","title":"A workflow to study mechanistic indicators for driver gene prediction with Moonlight.","date":"2023","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/37551622","citation_count":10,"is_preprint":false},{"pmid":"25592736","id":"PMC_25592736","title":"Copper homeostasis-related genes in three separate transcriptional units regulated by CsoR in Corynebacterium glutamicum.","date":"2015","source":"Applied microbiology and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/25592736","citation_count":8,"is_preprint":false},{"pmid":"36476390","id":"PMC_36476390","title":"ArfGAP3 regulates vesicle transport and glucose uptake in myoblasts.","date":"2022","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/36476390","citation_count":7,"is_preprint":false},{"pmid":"31608112","id":"PMC_31608112","title":"Genetic and Expression Analysis of COPI Genes and Alzheimer's Disease Susceptibility.","date":"2019","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31608112","citation_count":6,"is_preprint":false},{"pmid":"39642330","id":"PMC_39642330","title":"A new severe congenital neutropenia syndrome associated with autosomal recessive COPZ1 mutations.","date":"2025","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/39642330","citation_count":5,"is_preprint":false},{"pmid":"38776258","id":"PMC_38776258","title":"The Dynamic Plasticity of P. aeruginosa CueR Copper Transcription Factor upon Cofactor and DNA Binding.","date":"2024","source":"Chembiochem : a European journal of chemical biology","url":"https://pubmed.ncbi.nlm.nih.gov/38776258","citation_count":3,"is_preprint":false},{"pmid":"38226966","id":"PMC_38226966","title":"Identification and validation of SLCO4C1 as a biological marker in hepatocellular carcinoma based on anoikis classification features.","date":"2024","source":"Aging","url":"https://pubmed.ncbi.nlm.nih.gov/38226966","citation_count":3,"is_preprint":false},{"pmid":"40133516","id":"PMC_40133516","title":"Coding and regulatory somatic profiling of triple-negative breast cancer in Sub-Saharan African patients.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/40133516","citation_count":2,"is_preprint":false},{"pmid":"41582644","id":"PMC_41582644","title":"Electron Paramagnetic Resonance Spectroscopy Reveals Promoter Dependent Transcription Regulation by Copper Activated CueR in Pseudomonas aeruginosa.","date":"2026","source":"Chemphyschem : a European journal of chemical physics and physical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/41582644","citation_count":1,"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}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":10549,"output_tokens":1443,"usd":0.026646,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8140,"output_tokens":2110,"usd":0.046725,"stage2_stop_reason":"end_turn"},"total_usd":0.073371,"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\": 2011,\n      \"finding\": \"COPZ2 encodes a subunit (ζ2) of the COPI coatomer protein complex involved in intracellular trafficking and autophagy. Knockdown of COPZ2 alone (unlike COPZ1 knockdown) did not cause Golgi collapse, autophagy block, or apoptosis in tumor cells; however, simultaneous knockdown of both COPZ1 and COPZ2 was required to inhibit normal cell growth, indicating functional redundancy between the two paralogs.\",\n      \"method\": \"siRNA knockdown, cell viability assays, Golgi morphology assessment, autophagy assays, apoptosis assays in tumor vs. normal cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays (Golgi morphology, autophagy, apoptosis, growth inhibition) with siRNA knockdown in both tumor and normal cells; key findings replicated across different cell types\",\n      \"pmids\": [\"21746916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"COPZ2 gene silencing in tumor cells renders them dependent on the paralog COPZ1 for survival. Re-expression of COPZ2 in tumor cells protected them from cell death caused by COPZ1 knockdown, establishing that tumor-specific COPZ2 silencing is the mechanistic basis for COPZ1 dependency.\",\n      \"method\": \"COPZ2 re-expression rescue experiment, COPZ1 siRNA knockdown, cell viability/apoptosis assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rescue-by-re-expression is a rigorous epistasis approach; multiple cell lines tested with consistent results in one focused study\",\n      \"pmids\": [\"21746916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"COPZ2 harbors miR-152 within its intronic sequence, and COPZ2 is co-silenced with miR-152 in tumor cells via DNA hypermethylation. However, COPZ2 itself displays no tumor-suppressive activity; the tumor suppressor function is attributed to miR-152, not the COPZ2 protein.\",\n      \"method\": \"DNA methylation analysis, expression profiling of COPZ2 and miR-152 in tumor cell lines and clinical samples, functional assays separating COPZ2 and miR-152 activities\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct experimental separation of COPZ2 protein function from miR-152 function in a single focused study; no independent replication of the 'no tumor suppressor activity' negative finding\",\n      \"pmids\": [\"21746916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Hypoxia reduces COPZ2 expression (along with other COPI coatomer genes) in mouse beta cells, and this reduction is associated with decreased ER-to-Golgi protein trafficking. JNK inhibition restored COPZ2/COPI gene expression and ER-to-Golgi trafficking, placing COPZ2 regulation downstream of JNK activation under hypoxic stress.\",\n      \"method\": \"siRNA knockdown of pathway components, JNK inhibitor treatment, ER-to-Golgi trafficking assays, qPCR for gene expression in mouse islets and MIN6 cells\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic/pharmacological epistasis with functional trafficking readout; COPZ2 is one of several COPI genes measured, not exclusively studied, in a single lab study\",\n      \"pmids\": [\"27039902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Transduction of COPZ2 into COPZ1-mutated human CD34+ cells restored defective granulopoiesis, demonstrating that COPZ2 can functionally compensate for loss of COPZ1 in hematopoietic differentiation.\",\n      \"method\": \"Lentiviral transduction of COPZ2 into CD34+ cells with COPZ1 mutations; granulocytic differentiation assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rescue experiment with defined cellular phenotype (granulopoiesis restoration); single study, human primary cells\",\n      \"pmids\": [\"39642330\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"COPZ2 encodes the ζ2 subunit of the COPI coatomer complex involved in ER-to-Golgi vesicular trafficking and autophagy; it is functionally redundant with its paralog COPZ1 in normal cells, such that tumor-specific silencing of COPZ2 (via DNA hypermethylation, co-silencing with the intronic miR-152) renders tumor cells uniquely dependent on COPZ1 for Golgi integrity, autophagy, and survival, and COPZ2 re-expression can rescue cells from COPZ1 loss-of-function including restoration of granulopoiesis in COPZ1-mutant hematopoietic cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"COPZ2 encodes the ζ2 subunit of the COPI coatomer complex that mediates intracellular vesicular trafficking and autophagy [#0]. It is functionally redundant with its paralog COPZ1: knockdown of COPZ2 alone does not cause Golgi collapse, autophagy block, or apoptosis, but simultaneous loss of both paralogs is required to impair normal cell growth [#0]. This redundancy becomes therapeutically relevant when COPZ2 is silenced—as occurs in tumor cells—rendering those cells uniquely dependent on COPZ1, such that re-expression of COPZ2 rescues them from COPZ1 knockdown-induced death [#1], and transduction of COPZ2 into COPZ1-mutant human CD34+ cells restores defective granulopoiesis [#4]. COPZ2 expression is itself stress-regulated: hypoxia lowers COPZ2 and other COPI coatomer genes downstream of JNK activation, with a corresponding decline in ER-to-Golgi trafficking [#3]. The COPZ2 locus harbors miR-152 within an intron, and the two are co-silenced via DNA hypermethylation, but the tumor-suppressive activity maps to miR-152 rather than the COPZ2 protein [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that COPZ2 is a COPI coatomer ζ subunit functionally redundant with COPZ1, resolving why its individual loss is phenotypically silent while combined paralog loss disrupts cell growth.\",\n      \"evidence\": \"siRNA knockdown with Golgi morphology, autophagy, apoptosis, and viability readouts in tumor and normal cells\",\n      \"pmids\": [\"21746916\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural or biochemical demonstration of COPZ2 incorporation into the coatomer\", \"Mechanism distinguishing COPZ1 vs COPZ2 contribution to specific cargo trafficking unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed that tumor-specific COPZ2 silencing is the mechanistic basis for COPZ1 dependency, since COPZ2 re-expression protects tumor cells from COPZ1 knockdown.\",\n      \"evidence\": \"COPZ2 re-expression rescue with COPZ1 siRNA and viability/apoptosis assays across multiple cell lines\",\n      \"pmids\": [\"21746916\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define the trafficking cargoes whose loss kills COPZ2-silenced cells\", \"In vivo therapeutic window of COPZ1 targeting not established here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Distinguished the COPZ2 protein from its intronic miR-152, attributing the locus's tumor-suppressor activity to the microRNA rather than the protein.\",\n      \"evidence\": \"DNA methylation and expression profiling with functional separation of COPZ2 and miR-152 activities in tumor lines and clinical samples\",\n      \"pmids\": [\"21746916\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Negative finding (no COPZ2 tumor-suppressor activity) not independently replicated\", \"Regulatory coupling between COPZ2 transcription and miR-152 maturation not detailed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed COPZ2 regulation downstream of JNK under hypoxic stress, linking coatomer gene expression to ER-to-Golgi trafficking capacity.\",\n      \"evidence\": \"JNK inhibition, siRNA, and ER-to-Golgi trafficking assays with qPCR in mouse islets and MIN6 cells\",\n      \"pmids\": [\"27039902\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"COPZ2 measured among several COPI genes, not isolated\", \"Direct transcriptional mechanism of JNK-dependent COPZ2 repression unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended COPZ2-COPZ1 redundancy to hematopoiesis by showing COPZ2 can compensate for COPZ1 mutation to restore granulopoiesis.\",\n      \"evidence\": \"Lentiviral COPZ2 transduction into COPZ1-mutant human CD34+ cells with granulocytic differentiation assays\",\n      \"pmids\": [\"39642330\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single study in primary cells without reciprocal validation\", \"Molecular basis of COPZ1 requirement during granulopoiesis not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how COPZ1 and COPZ2 differ at the level of cargo selectivity or coatomer assembly, and what dictates tissue- and tumor-specific silencing of COPZ2.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of COPZ2-containing coatomer\", \"Substrate/cargo specificity distinguishing the paralogs undefined\", \"Regulators of COPZ2 epigenetic silencing beyond DNA hypermethylation unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"COPI coatomer\"],\n    \"partners\": [\"COPZ1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}