{"gene":"OAZ2","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":2022,"finding":"RNA-edited AZIN1 promotes tumor angiogenesis via an OAZ2-mediated ubiquitin-independent proteasome pathway that delays c-Myc degradation, leading to increased IL-8 mRNA levels and secretion of the angiogenic factor IL-8.","method":"In vitro and in vivo experiments with RNA-edited AZIN1 constructs, combined with pathway analysis linking OAZ2 to ubiquitin-independent proteasomal degradation of c-Myc","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway established in vitro and in vivo by single lab with functional readout, but limited orthogonal validation of OAZ2-specific role","pmids":["35365616"],"is_preprint":false},{"year":2018,"finding":"miR-34a directly targets the 3'UTR of OAZ2 mRNA to positively regulate its mRNA stability, and suppression of this miR-34a/OAZ2 signaling axis by chemotherapeutic agents enhances ABC transporter activation and antiapoptosis pathways, contributing to multidrug resistance in colon cancer cells.","method":"Luciferase reporter assays targeting OAZ2 3'UTR, ectopic miR-34a expression/inhibition with drug-response assays, and histoculture drug response assay in clinical samples","journal":"Journal of immunology research","confidence":"Medium","confidence_rationale":"Tier 2 — direct 3'UTR targeting demonstrated with functional downstream consequences, single lab","pmids":["30175154"],"is_preprint":false},{"year":2009,"finding":"OAZ1 and OAZ2 are expressed ubiquitously and control intracellular polyamine concentrations in a feedback manner by binding to and inactivating ornithine decarboxylase (ODC), whereas OAZ3 is expressed specifically in germline cells during spermiogenesis.","method":"Genetic knockout mouse model (OAZ3 knockout), polyamine concentration measurements, and expression analysis","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 — function of OAZ1/OAZ2 as ODC regulators established by comparison with OAZ3 knockout and expression analysis; OAZ1/2 function is contextual description from prior literature cited within this paper","pmids":["19893612"],"is_preprint":false},{"year":2011,"finding":"Increased H3K4me3 histone modification at the OAZ1 promoter (but not specifically OAZ2 promoter) is associated with upregulation of OAZ1 and OAZ2 expression in the prefrontal cortex of suicide completers, implicating epigenetic regulation of OAZ2 expression via open chromatin marks.","method":"Chromatin immunoprecipitation (ChIP) for H3K4me3 at promoter regions, correlation with gene expression in human postmortem brain tissue","journal":"The international journal of neuropsychopharmacology","confidence":"Low","confidence_rationale":"Tier 3 — epigenetic association in human tissue, OAZ2 promoter H3K4me3 not directly measured, indirect inference","pmids":["22008221"],"is_preprint":false},{"year":2021,"finding":"UXT knockdown in colorectal cancer cells increases expression of OAZ1, OAZ2, and OAZ3 (which negatively regulate polyamine synthesis) and decreases putrescine levels, while UXT overexpression has the opposite effect, placing OAZ2 downstream of UXT in polyamine metabolic regulation.","method":"siRNA knockdown and overexpression of UXT with measurement of OAZ1/2/3 mRNA and putrescine levels; in vivo xenograft tumor model","journal":"Human cell","confidence":"Low","confidence_rationale":"Tier 3 — functional knockdown/overexpression with metabolite readout but no direct OAZ2-specific mechanistic dissection","pmids":["41931169"],"is_preprint":false}],"current_model":"OAZ2 is a ubiquitously expressed ornithine decarboxylase (ODC) antizyme that negatively regulates intracellular polyamine concentrations by binding to and inactivating ODC in a polyamine-dependent feedback manner; it also participates in a ubiquitin-independent proteasomal degradation pathway (downstream of RNA-edited AZIN1) that targets c-Myc, and its mRNA is directly stabilized by miR-34a, loss of which contributes to multidrug resistance via ABC transporter activation."},"narrative":{"teleology":[{"year":2009,"claim":"Establishing OAZ2 as a ubiquitously expressed ODC antizyme resolved its basic biochemical identity: OAZ2 binds and inactivates ODC to control intracellular polyamine levels in a feedback manner, distinguishing it from the germline-specific OAZ3.","evidence":"OAZ3 knockout mouse model with polyamine measurements and comparative expression analysis across tissues","pmids":["19893612"],"confidence":"Medium","gaps":["Non-redundant functions of OAZ2 versus OAZ1 remain undefined","No OAZ2-specific knockout phenotype reported","Tissue-specific quantitative contribution of OAZ2 to polyamine homeostasis not dissected"]},{"year":2018,"claim":"Identifying miR-34a as a direct positive regulator of OAZ2 mRNA stability revealed a post-transcriptional control layer and connected OAZ2 loss to chemoresistance through ABC transporter activation.","evidence":"Luciferase reporter assays on OAZ2 3′UTR, miR-34a overexpression/inhibition with drug-response assays in colon cancer cells and clinical histoculture samples","pmids":["30175154"],"confidence":"Medium","gaps":["Mechanism by which miR-34a stabilizes rather than represses OAZ2 mRNA is unconventional and not mechanistically resolved","Whether OAZ2 protein levels change proportionally to mRNA was not directly demonstrated","Single-lab finding without independent replication"]},{"year":2022,"claim":"Demonstrating that RNA-edited AZIN1 delays c-Myc degradation through an OAZ2-dependent ubiquitin-independent proteasome pathway expanded OAZ2's role beyond ODC regulation to include control of oncoprotein stability and downstream angiogenesis via IL-8.","evidence":"In vitro and in vivo experiments with edited AZIN1 constructs, pathway analysis linking OAZ2 to ubiquitin-independent proteasomal degradation of c-Myc","pmids":["35365616"],"confidence":"Medium","gaps":["Direct physical interaction between OAZ2 and c-Myc has not been demonstrated","Whether OAZ2 acts as a direct adaptor for proteasomal targeting of c-Myc or acts indirectly remains unclear","Limited orthogonal validation of OAZ2-specific contribution"]},{"year":null,"claim":"Key open questions include the non-redundant in vivo functions of OAZ2 versus OAZ1, the structural basis for OAZ2-mediated ubiquitin-independent proteasomal targeting, and whether OAZ2 directly binds substrates beyond ODC.","evidence":"","pmids":[],"confidence":"Low","gaps":["No OAZ2-specific genetic loss-of-function model exists","No structural data for OAZ2 or OAZ2–substrate complexes reported","Full substrate repertoire of OAZ2 in ubiquitin-independent degradation unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,4]}],"complexes":[],"partners":["ODC1","AZIN1"],"other_free_text":[]},"mechanistic_narrative":"OAZ2 is an ornithine decarboxylase (ODC) antizyme that negatively regulates intracellular polyamine concentrations by binding to and inactivating ODC in a polyamine-dependent feedback loop [PMID:19893612]. OAZ2 participates in a ubiquitin-independent proteasomal degradation pathway that targets c-Myc; RNA-edited AZIN1 delays this OAZ2-mediated c-Myc degradation, leading to increased IL-8 secretion and tumor angiogenesis [PMID:35365616]. OAZ2 mRNA stability is directly regulated by miR-34a through its 3′UTR, and loss of this miR-34a/OAZ2 axis enhances ABC transporter activation and multidrug resistance in colon cancer cells [PMID:30175154]."},"prefetch_data":{"uniprot":{"accession":"O95190","full_name":"Ornithine decarboxylase antizyme 2","aliases":[],"length_aa":189,"mass_kda":21.0,"function":"Ornithine decarboxylase (ODC) antizyme protein that negatively regulates ODC activity and intracellular polyamine biosynthesis and uptake in response to increased intracellular polyamine levels. Binds to ODC monomers, inhibiting the assembly of the functional ODC homodimers. Does not target the ODC monomers for degradation, which allows a protein synthesis-independent restoration of ODC activity (PubMed:17900240). Involved in the translocation of AZIN2 from ER-Golgi intermediate compartment (ERGIC) to the cytosol (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O95190/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/OAZ2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/OAZ2","total_profiled":1310},"omim":[{"mim_id":"608353","title":"ANTIZYME INHIBITOR 2; AZIN2","url":"https://www.omim.org/entry/608353"},{"mim_id":"605138","title":"ORNITHINE DECARBOXYLASE ANTIZYME 3; OAZ3","url":"https://www.omim.org/entry/605138"},{"mim_id":"604152","title":"ORNITHINE DECARBOXYLASE ANTIZYME 2; OAZ2","url":"https://www.omim.org/entry/604152"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/OAZ2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O95190","domains":[{"cath_id":"3.40.630.60","chopping":"53-179","consensus_level":"high","plddt":91.6278,"start":53,"end":179}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95190","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95190-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95190-F1-predicted_aligned_error_v6.png","plddt_mean":77.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=OAZ2","jax_strain_url":"https://www.jax.org/strain/search?query=OAZ2"},"sequence":{"accession":"O95190","fasta_url":"https://rest.uniprot.org/uniprotkb/O95190.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95190/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95190"}},"corpus_meta":[{"pmid":"19047152","id":"PMC_19047152","title":"ODC1 is a critical determinant of MYCN oncogenesis and a therapeutic target in neuroblastoma.","date":"2008","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/19047152","citation_count":218,"is_preprint":false},{"pmid":"19893612","id":"PMC_19893612","title":"OAZ-t/OAZ3 is essential for rigid connection of sperm tails to heads in mouse.","date":"2009","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19893612","citation_count":86,"is_preprint":false},{"pmid":"19960435","id":"PMC_19960435","title":"The polyamine metabolism genes ornithine decarboxylase and antizyme 2 predict aggressive behavior in neuroblastomas with and without MYCN amplification.","date":"2010","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/19960435","citation_count":56,"is_preprint":false},{"pmid":"22008221","id":"PMC_22008221","title":"Effects of histone modifications on increased expression of polyamine biosynthetic genes in suicide.","date":"2011","source":"The international journal of neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/22008221","citation_count":39,"is_preprint":false},{"pmid":"35365616","id":"PMC_35365616","title":"A novel mechanism for A-to-I RNA-edited AZIN1 in promoting tumor angiogenesis in colorectal cancer.","date":"2022","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/35365616","citation_count":33,"is_preprint":false},{"pmid":"23260169","id":"PMC_23260169","title":"Effects of promoter methylation on increased expression of polyamine biosynthetic genes in suicide.","date":"2012","source":"Journal of psychiatric research","url":"https://pubmed.ncbi.nlm.nih.gov/23260169","citation_count":32,"is_preprint":false},{"pmid":"30175154","id":"PMC_30175154","title":"miR-34a Regulates Multidrug Resistance via Positively Modulating OAZ2 Signaling in Colon Cancer Cells.","date":"2018","source":"Journal of immunology research","url":"https://pubmed.ncbi.nlm.nih.gov/30175154","citation_count":31,"is_preprint":false},{"pmid":"21712390","id":"PMC_21712390","title":"Ornithine decarboxylase antizyme Oaz3 modulates protein phosphatase activity.","date":"2011","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21712390","citation_count":24,"is_preprint":false},{"pmid":"20670436","id":"PMC_20670436","title":"Clock genes and their genomic distributions in three species of salmonid fishes: Associations with genes regulating sexual maturation and cell cycling.","date":"2010","source":"BMC research notes","url":"https://pubmed.ncbi.nlm.nih.gov/20670436","citation_count":23,"is_preprint":false},{"pmid":"25079701","id":"PMC_25079701","title":"Gene polymorphisms in the ornithine decarboxylase-polyamine pathway modify gastric cancer risk by interaction with isoflavone concentrations.","date":"2014","source":"Gastric cancer : official journal of the International Gastric Cancer Association and the Japanese Gastric Cancer Association","url":"https://pubmed.ncbi.nlm.nih.gov/25079701","citation_count":18,"is_preprint":false},{"pmid":"28324173","id":"PMC_28324173","title":"Effect of Oaz1 overexpression on goose ovarian granulosa cells.","date":"2017","source":"Amino acids","url":"https://pubmed.ncbi.nlm.nih.gov/28324173","citation_count":18,"is_preprint":false},{"pmid":"12426106","id":"PMC_12426106","title":"Structure and promoter activity of the gene encoding ornithine decarboxylase antizyme expressed exclusively in haploid germ cells in testis (OAZt/Oaz3).","date":"2002","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/12426106","citation_count":12,"is_preprint":false},{"pmid":"32748829","id":"PMC_32748829","title":"Deep Transcriptomic Analysis Reveals the Dynamic Developmental Progression during Early Development of Channel Catfish (Ictalurus punctatus).","date":"2020","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32748829","citation_count":12,"is_preprint":false},{"pmid":"27074718","id":"PMC_27074718","title":"Effects of agmatine on secretion of interferon tau and catecholamines and expression of genes related to production of polyamines by ovine trophectoderm cells.","date":"2016","source":"Amino acids","url":"https://pubmed.ncbi.nlm.nih.gov/27074718","citation_count":11,"is_preprint":false},{"pmid":"33633776","id":"PMC_33633776","title":"Gene Banks as Reservoirs to Detect Recent Selection: The Example of the Asturiana de los Valles Bovine Breed.","date":"2021","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33633776","citation_count":8,"is_preprint":false},{"pmid":"24831833","id":"PMC_24831833","title":"Molecular cloning and mRNA expression analysis of ornithine decarboxylase antizyme 2 in ovarian follicles of the Sichuan white goose (Anser cygnoides).","date":"2014","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/24831833","citation_count":6,"is_preprint":false},{"pmid":"36527757","id":"PMC_36527757","title":"Identifying transcript-level differential expression in primary human immune cells.","date":"2022","source":"Molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36527757","citation_count":5,"is_preprint":false},{"pmid":"33817296","id":"PMC_33817296","title":"Exogenous spermidine affects polyamine metabolism in the mouse hypothalamus.","date":"2021","source":"Open life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33817296","citation_count":4,"is_preprint":false},{"pmid":"39226776","id":"PMC_39226776","title":"Whole-genome analysis of resilience based on the stability of reproduction performance during a porcine reproductive and respiratory syndrome virus outbreak in sows.","date":"2024","source":"Animal : an international journal of animal bioscience","url":"https://pubmed.ncbi.nlm.nih.gov/39226776","citation_count":2,"is_preprint":false},{"pmid":"40026806","id":"PMC_40026806","title":"Development of a Diagnostic Model for Focal Segmental Glomerulosclerosis: Integrating Machine Learning on Activated Pathways and Clinical Validation.","date":"2025","source":"International journal of general medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40026806","citation_count":0,"is_preprint":false},{"pmid":"41931169","id":"PMC_41931169","title":"Ubiquitously expressed prefoldin-like chaperone (UXT) regulates putrescine metabolism and promotes colorectal cancer progression.","date":"2026","source":"Human cell","url":"https://pubmed.ncbi.nlm.nih.gov/41931169","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12318,"output_tokens":1297,"usd":0.028205},"stage2":{"model":"claude-opus-4-6","input_tokens":4514,"output_tokens":2579,"usd":0.130568},"total_usd":0.158773,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2022,\n      \"finding\": \"RNA-edited AZIN1 promotes tumor angiogenesis via an OAZ2-mediated ubiquitin-independent proteasome pathway that delays c-Myc degradation, leading to increased IL-8 mRNA levels and secretion of the angiogenic factor IL-8.\",\n      \"method\": \"In vitro and in vivo experiments with RNA-edited AZIN1 constructs, combined with pathway analysis linking OAZ2 to ubiquitin-independent proteasomal degradation of c-Myc\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway established in vitro and in vivo by single lab with functional readout, but limited orthogonal validation of OAZ2-specific role\",\n      \"pmids\": [\"35365616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"miR-34a directly targets the 3'UTR of OAZ2 mRNA to positively regulate its mRNA stability, and suppression of this miR-34a/OAZ2 signaling axis by chemotherapeutic agents enhances ABC transporter activation and antiapoptosis pathways, contributing to multidrug resistance in colon cancer cells.\",\n      \"method\": \"Luciferase reporter assays targeting OAZ2 3'UTR, ectopic miR-34a expression/inhibition with drug-response assays, and histoculture drug response assay in clinical samples\",\n      \"journal\": \"Journal of immunology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3'UTR targeting demonstrated with functional downstream consequences, single lab\",\n      \"pmids\": [\"30175154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"OAZ1 and OAZ2 are expressed ubiquitously and control intracellular polyamine concentrations in a feedback manner by binding to and inactivating ornithine decarboxylase (ODC), whereas OAZ3 is expressed specifically in germline cells during spermiogenesis.\",\n      \"method\": \"Genetic knockout mouse model (OAZ3 knockout), polyamine concentration measurements, and expression analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — function of OAZ1/OAZ2 as ODC regulators established by comparison with OAZ3 knockout and expression analysis; OAZ1/2 function is contextual description from prior literature cited within this paper\",\n      \"pmids\": [\"19893612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Increased H3K4me3 histone modification at the OAZ1 promoter (but not specifically OAZ2 promoter) is associated with upregulation of OAZ1 and OAZ2 expression in the prefrontal cortex of suicide completers, implicating epigenetic regulation of OAZ2 expression via open chromatin marks.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) for H3K4me3 at promoter regions, correlation with gene expression in human postmortem brain tissue\",\n      \"journal\": \"The international journal of neuropsychopharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — epigenetic association in human tissue, OAZ2 promoter H3K4me3 not directly measured, indirect inference\",\n      \"pmids\": [\"22008221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"UXT knockdown in colorectal cancer cells increases expression of OAZ1, OAZ2, and OAZ3 (which negatively regulate polyamine synthesis) and decreases putrescine levels, while UXT overexpression has the opposite effect, placing OAZ2 downstream of UXT in polyamine metabolic regulation.\",\n      \"method\": \"siRNA knockdown and overexpression of UXT with measurement of OAZ1/2/3 mRNA and putrescine levels; in vivo xenograft tumor model\",\n      \"journal\": \"Human cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — functional knockdown/overexpression with metabolite readout but no direct OAZ2-specific mechanistic dissection\",\n      \"pmids\": [\"41931169\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"OAZ2 is a ubiquitously expressed ornithine decarboxylase (ODC) antizyme that negatively regulates intracellular polyamine concentrations by binding to and inactivating ODC in a polyamine-dependent feedback manner; it also participates in a ubiquitin-independent proteasomal degradation pathway (downstream of RNA-edited AZIN1) that targets c-Myc, and its mRNA is directly stabilized by miR-34a, loss of which contributes to multidrug resistance via ABC transporter activation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"OAZ2 is an ornithine decarboxylase (ODC) antizyme that negatively regulates intracellular polyamine concentrations by binding to and inactivating ODC in a polyamine-dependent feedback loop [PMID:19893612]. OAZ2 participates in a ubiquitin-independent proteasomal degradation pathway that targets c-Myc; RNA-edited AZIN1 delays this OAZ2-mediated c-Myc degradation, leading to increased IL-8 secretion and tumor angiogenesis [PMID:35365616]. OAZ2 mRNA stability is directly regulated by miR-34a through its 3′UTR, and loss of this miR-34a/OAZ2 axis enhances ABC transporter activation and multidrug resistance in colon cancer cells [PMID:30175154].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing OAZ2 as a ubiquitously expressed ODC antizyme resolved its basic biochemical identity: OAZ2 binds and inactivates ODC to control intracellular polyamine levels in a feedback manner, distinguishing it from the germline-specific OAZ3.\",\n      \"evidence\": \"OAZ3 knockout mouse model with polyamine measurements and comparative expression analysis across tissues\",\n      \"pmids\": [\"19893612\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Non-redundant functions of OAZ2 versus OAZ1 remain undefined\",\n        \"No OAZ2-specific knockout phenotype reported\",\n        \"Tissue-specific quantitative contribution of OAZ2 to polyamine homeostasis not dissected\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying miR-34a as a direct positive regulator of OAZ2 mRNA stability revealed a post-transcriptional control layer and connected OAZ2 loss to chemoresistance through ABC transporter activation.\",\n      \"evidence\": \"Luciferase reporter assays on OAZ2 3′UTR, miR-34a overexpression/inhibition with drug-response assays in colon cancer cells and clinical histoculture samples\",\n      \"pmids\": [\"30175154\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which miR-34a stabilizes rather than represses OAZ2 mRNA is unconventional and not mechanistically resolved\",\n        \"Whether OAZ2 protein levels change proportionally to mRNA was not directly demonstrated\",\n        \"Single-lab finding without independent replication\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that RNA-edited AZIN1 delays c-Myc degradation through an OAZ2-dependent ubiquitin-independent proteasome pathway expanded OAZ2's role beyond ODC regulation to include control of oncoprotein stability and downstream angiogenesis via IL-8.\",\n      \"evidence\": \"In vitro and in vivo experiments with edited AZIN1 constructs, pathway analysis linking OAZ2 to ubiquitin-independent proteasomal degradation of c-Myc\",\n      \"pmids\": [\"35365616\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between OAZ2 and c-Myc has not been demonstrated\",\n        \"Whether OAZ2 acts as a direct adaptor for proteasomal targeting of c-Myc or acts indirectly remains unclear\",\n        \"Limited orthogonal validation of OAZ2-specific contribution\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the non-redundant in vivo functions of OAZ2 versus OAZ1, the structural basis for OAZ2-mediated ubiquitin-independent proteasomal targeting, and whether OAZ2 directly binds substrates beyond ODC.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No OAZ2-specific genetic loss-of-function model exists\",\n        \"No structural data for OAZ2 or OAZ2–substrate complexes reported\",\n        \"Full substrate repertoire of OAZ2 in ubiquitin-independent degradation unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"R-HSA-R-HSA-392499\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ODC1\",\n      \"AZIN1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to fix the pathway term_id — I had a typo. Let me correct:\n\n```json\n{\n  \"mechanistic_narrative\": \"OAZ2 is an ornithine decarboxylase (ODC) antizyme that negatively regulates intracellular polyamine concentrations by binding to and inactivating ODC in a polyamine-dependent feedback loop [PMID:19893612]. OAZ2 participates in a ubiquitin-independent proteasomal degradation pathway that targets c-Myc; RNA-edited AZIN1 delays this OAZ2-mediated c-Myc degradation, leading to increased IL-8 secretion and tumor angiogenesis [PMID:35365616]. OAZ2 mRNA stability is directly regulated by miR-34a through its 3′UTR, and loss of this miR-34a/OAZ2 axis enhances ABC transporter activation and multidrug resistance in colon cancer cells [PMID:30175154].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing OAZ2 as a ubiquitously expressed ODC antizyme resolved its basic biochemical identity: OAZ2 binds and inactivates ODC to control intracellular polyamine levels in a feedback manner, distinguishing it from the germline-specific OAZ3.\",\n      \"evidence\": \"OAZ3 knockout mouse model with polyamine measurements and comparative expression analysis across tissues\",\n      \"pmids\": [\"19893612\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Non-redundant functions of OAZ2 versus OAZ1 remain undefined\",\n        \"No OAZ2-specific knockout phenotype reported\",\n        \"Tissue-specific quantitative contribution of OAZ2 to polyamine homeostasis not dissected\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying miR-34a as a direct positive regulator of OAZ2 mRNA stability revealed a post-transcriptional control layer and connected OAZ2 loss to chemoresistance through ABC transporter activation.\",\n      \"evidence\": \"Luciferase reporter assays on OAZ2 3′UTR, miR-34a overexpression/inhibition with drug-response assays in colon cancer cells and clinical histoculture samples\",\n      \"pmids\": [\"30175154\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which miR-34a stabilizes rather than represses OAZ2 mRNA is unconventional and not mechanistically resolved\",\n        \"Whether OAZ2 protein levels change proportionally to mRNA was not directly demonstrated\",\n        \"Single-lab finding without independent replication\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that RNA-edited AZIN1 delays c-Myc degradation through an OAZ2-dependent ubiquitin-independent proteasome pathway expanded OAZ2's role beyond ODC regulation to include control of oncoprotein stability and downstream angiogenesis via IL-8.\",\n      \"evidence\": \"In vitro and in vivo experiments with edited AZIN1 constructs, pathway analysis linking OAZ2 to ubiquitin-independent proteasomal degradation of c-Myc\",\n      \"pmids\": [\"35365616\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between OAZ2 and c-Myc has not been demonstrated\",\n        \"Whether OAZ2 acts as a direct adaptor for proteasomal targeting of c-Myc or acts indirectly remains unclear\",\n        \"Limited orthogonal validation of OAZ2-specific contribution\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the non-redundant in vivo functions of OAZ2 versus OAZ1, the structural basis for OAZ2-mediated ubiquitin-independent proteasomal targeting, and whether OAZ2 directly binds substrates beyond ODC.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No OAZ2-specific genetic loss-of-function model exists\",\n        \"No structural data for OAZ2 or OAZ2-substrate complexes reported\",\n        \"Full substrate repertoire of OAZ2 in ubiquitin-independent degradation unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ODC1\",\n      \"AZIN1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}