{"gene":"AP1M2","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1999,"finding":"mu1B (AP1M2) is an epithelial cell-specific homolog of mu1A that assembles into a novel form of the AP-1 clathrin adaptor complex (AP-1B). Expression of mu1B in LLC-PK1 kidney epithelial cells, which normally lack mu1B and missort basolateral proteins apically, selectively restores basolateral targeting of membrane proteins without affecting apical targeting, establishing AP1M2 as the critical subunit mediating basolateral sorting in polarized epithelial cells.","method":"Stable transfection of mu1B into LLC-PK1 cells, immunofluorescence, flow cytometry, functional sorting assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — clean gain-of-function in defined cell system with specific polarized sorting phenotype, seminal discovery paper with 432 citations","pmids":["10535737"],"is_preprint":false},{"year":1999,"finding":"mu1B (AP1M2) is a novel member of the adaptor medium chain family with 79% amino acid sequence identity to mu1A, expressed specifically in a subset of polarized epithelial and exocrine cells (not ubiquitously). Yeast two-hybrid analyses demonstrate that mu1B interacts with generic tyrosine-based sorting signals, consistent with a role in polarized protein sorting.","method":"Northern blotting, in situ hybridization, yeast two-hybrid interaction assays","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific expression confirmed by multiple methods, direct binding to sorting signals demonstrated; 212 citations","pmids":["10338135"],"is_preprint":false},{"year":1999,"finding":"The genomic structure of Ap1m2 (mu1B) was determined: the gene contains introns at identical positions to Ap1m1 (mu1A), consistent with origin by relatively recent gene duplication. AP1M2 was mapped to human chromosome 19p13.2 and mouse chromosome 9 (proximal region), regions known to be syntenic.","method":"Genomic cloning, intron mapping, chromosomal mapping (FISH/radiation hybrid)","journal":"Cytogenetics and cell genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct genomic structural analysis; provides evolutionary context but limited functional mechanism","pmids":["10640811"],"is_preprint":false},{"year":2001,"finding":"AP-1B (containing AP1M2/mu1B) localizes to the trans-Golgi network and recycling endosomes, specifically to subdomains of the TGN distinct from those occupied by AP-1A. AP-1B interacts with basolateral cargo such as LDLR and with clathrin in the TGN, mediating sorting of basolateral proteins away from apical and AP-1A-selected endolysosomal proteins.","method":"Immunofluorescence, immunoelectron microscopy of epitope-tagged mu1A and mu1B in LLC-PK1 cells, co-localization with furin and LDLR","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — direct subcellular localization by immunoelectron microscopy with functional sorting readout, 208 citations","pmids":["11157985"],"is_preprint":false},{"year":2007,"finding":"Type Igamma phosphatidylinositol phosphate kinase (PIPKIgamma) directly binds to the mu1B (AP1M2) subunit of AP-1B and acts as a signalling scaffold linking AP-1B to E-cadherin for basolateral trafficking. Disruption of PIPKIgamma binding to mu1B impairs E-cadherin transport and blocks adherens junction assembly. A hereditary gastric cancer-associated E-cadherin mutation that loses PIPKIgamma binding shows disrupted basolateral membrane targeting.","method":"Co-immunoprecipitation, yeast two-hybrid, siRNA knockdown, dominant-negative constructs, fluorescence microscopy, in vitro binding assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, functional rescue, disease mutation validation; multiple orthogonal methods; 145 citations","pmids":["17261850"],"is_preprint":false},{"year":2016,"finding":"AP1M2 (mu1B) interacts with the tyrosine-sorting motif YMPL of Arabidopsis vacuolar sorting receptor VSR4 through the mu-homology domain of AP1M2. Mutation of YMPL attenuates this interaction (shown by bimolecular fluorescence complementation), and disruption of the tyrosine-sorting motif alters VSR4 localization (increased plasma membrane or vacuolar accumulation), demonstrating the role of the AP1M2 tyrosine-motif binding site in post-Golgi sorting.","method":"Bimolecular fluorescence complementation (BiFC/V10-BiFC system), site-directed mutagenesis, confocal microscopy","journal":"Bioscience, biotechnology, and biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, BiFC interaction assay with mutagenesis; plant system may not fully reflect mammalian AP1M2","pmids":["26745465"],"is_preprint":false},{"year":2024,"finding":"Intestinal epithelial cell-specific deletion of Ap1m2 in mice (Ap1m2ΔIEC) causes spontaneous IgA nephropathy-like disease. Mechanistically, AP1M2 deficiency leads to mis-sorting of polymeric immunoglobulin receptors (pIgR) in intestinal epithelial cells, resulting in downregulation and aberrant localization of pIgR and consequently elevated aberrantly glycosylated IgA in serum. AP1M2 deficiency also disrupts IL-22-STAT3 signaling in the intestine, causing dysbiosis that further promotes aberrant IgA glycosylation and renal IgA deposition.","method":"Intestinal epithelium-specific Ap1m2 knockout mice, immunofluorescence, flow cytometry, antibiotic treatment experiments, serum IgA glycosylation analysis, kidney pathology","journal":"EBioMedicine","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific KO with defined molecular mechanism (pIgR mis-sorting), multiple orthogonal phenotypic readouts","pmids":["39059316"],"is_preprint":false},{"year":2025,"finding":"AP1M2 deficiency (biallelic loss-of-function) causes a new autoinflammatory disease with colitis in humans and mice. Mechanistically, AP1M2 deficiency in intestinal epithelial cells leads to accumulation of TNFR1 signaling downstream proteins (RIPK1, TBK1, IKKα/β, NEMO) in clathrin-coated vesicles, causing enhanced NF-κB activation and chemokine overproduction. Knockout of Tnfr1 rescued the gastrointestinal inflammation, demonstrating that AP1M2-mediated TNFR1 endocytic trafficking suppresses NF-κB-driven intestinal inflammation.","method":"Ap1m2-/- and Ap1m2-/-::Tnfr1-/- mouse models, super-resolution imaging, clathrin-coated vesicle enrichment, Western blot, Stereo-seq, genetic epistasis (Tnfr1 KO rescue)","journal":"Arthritis & rheumatology (Hoboken, N.J.)","confidence":"High","confidence_rationale":"Tier 1-2 — genetic epistasis (double KO rescue), super-resolution imaging, biochemical fractionation, and human patient variant all converging on one mechanism","pmids":["41451456"],"is_preprint":false},{"year":2025,"finding":"AP1M2 promotes gemcitabine-cisplatin chemoresistance in bladder cancer by interacting with the RNA-binding protein PUM1 to stabilize RAD54B mRNA, thereby enhancing DNA repair and cell survival under chemotherapeutic stress. Inhibition of AP1M2 or the AP1M2/PUM1/RAD54B axis sensitized bladder cancer xenografts to gemcitabine-cisplatin treatment in vivo.","method":"Co-immunoprecipitation, bladder cancer organoid model with drug sensitivity assays, Western blot, xenograft mouse model, RNA stability assays","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP interaction, in vivo xenograft validation; single lab but multiple methods including in vivo rescue","pmids":["40387455"],"is_preprint":false},{"year":2004,"finding":"HIV-1 Nef disrupts MHC-I trafficking to the cell surface by recruiting AP-1 (containing mu1 subunit) to the MHC-I cytoplasmic tail and rerouting newly synthesized MHC-I from the TGN to lysosomes; this mechanism depends on expression of the mu1 subunit of AP-1A. Nef promotes a physical interaction between endogenous AP-1 and MHC-I via a novel AP-1 binding site in the MHC-I cytoplasmic tail.","method":"Co-immunoprecipitation of endogenous proteins in HIV-infected primary T cells, siRNA knockdown of mu1, confocal microscopy, flow cytometry","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — endogenous co-IP in primary cells, siRNA epistasis; however this paper focuses on AP-1A (mu1A) not AP1M2 specifically","pmids":["15569716"],"is_preprint":false}],"current_model":"AP1M2 (mu1B) is the epithelial cell-specific mu subunit of the AP-1B clathrin adaptor complex that localizes to the TGN and recycling endosomes, where it recognizes tyrosine-based sorting signals on basolateral cargo proteins to mediate polarized basolateral membrane targeting; additionally, AP1M2 regulates TNFR1 endocytic trafficking in intestinal epithelial cells to suppress NF-κB activation and prevent autoinflammation, facilitates proper sorting of polymeric immunoglobulin receptors to maintain intestinal barrier integrity, and interacts with PUM1 to stabilize RAD54B mRNA and modulate DNA damage responses in cancer cells."},"narrative":{"teleology":[{"year":1999,"claim":"Identification of AP1M2 as an epithelial-specific AP-1 medium chain resolved how polarized epithelial cells selectively sort basolateral cargo, establishing that a tissue-specific adaptor subunit swap (mu1B for mu1A) creates a functionally distinct AP-1B complex.","evidence":"Cloning, expression profiling (Northern, in situ hybridization), yeast two-hybrid binding to tyrosine-based signals, and gain-of-function transfection into mu1B-deficient LLC-PK1 cells restoring basolateral sorting","pmids":["10535737","10338135"],"confidence":"High","gaps":["Structural basis of mu1B versus mu1A cargo discrimination not determined","Endogenous regulatory mechanisms controlling AP1M2 expression unknown"]},{"year":2001,"claim":"Demonstrating that AP-1B localizes to distinct TGN and recycling endosome subdomains, separate from AP-1A, established the compartmental basis for how the two AP-1 variants sort different cargo classes (basolateral versus endolysosomal).","evidence":"Immunoelectron microscopy and co-localization with furin and LDLR in LLC-PK1 cells expressing epitope-tagged mu1A or mu1B","pmids":["11157985"],"confidence":"High","gaps":["Mechanism specifying AP-1B to basolateral TGN subdomains versus AP-1A to other TGN subdomains not identified","Recycling endosome sorting function not functionally dissected from TGN sorting"]},{"year":2007,"claim":"Discovery that PIPKIγ binds mu1B directly and scaffolds E-cadherin to AP-1B revealed how a lipid kinase coordinates cargo selection with basolateral targeting, linking AP1M2 to adherens junction biogenesis and explaining a hereditary gastric cancer E-cadherin mutation.","evidence":"Reciprocal co-immunoprecipitation, yeast two-hybrid, siRNA knockdown, dominant-negative constructs, and disease mutation analysis","pmids":["17261850"],"confidence":"High","gaps":["Whether PIPKIγ enzymatic product (PI(4,5)P2) is required at the sorting step or only the scaffolding interaction is unclear","Full set of cargoes that require PIPKIγ–mu1B scaffolding not defined"]},{"year":2024,"claim":"Intestinal epithelial-specific Ap1m2 knockout revealed that AP1M2-mediated pIgR sorting is essential for mucosal IgA transport and that its loss causes systemic IgA nephropathy-like disease through aberrant IgA glycosylation and dysbiosis, extending AP1M2 function beyond local membrane sorting to systemic immune homeostasis.","evidence":"Conditional intestinal epithelial Ap1m2 knockout mice with serum IgA glycosylation analysis, kidney pathology, and antibiotic rescue experiments","pmids":["39059316"],"confidence":"High","gaps":["Precise step in pIgR trafficking disrupted by AP1M2 loss (TGN exit versus recycling endosome sorting) not resolved","Whether AP1M2 deficiency in non-intestinal epithelia contributes to IgA nephropathy unknown"]},{"year":2025,"claim":"Identification of AP1M2 as the critical regulator of TNFR1 endocytic trafficking in intestinal epithelium, with biallelic loss-of-function causing human autoinflammatory colitis rescued by Tnfr1 knockout, established a direct link between AP-1B-mediated receptor endocytosis and inflammatory signaling control.","evidence":"Ap1m2 knockout and Ap1m2/Tnfr1 double-knockout mice, super-resolution imaging of clathrin-coated vesicles, biochemical fractionation, human patient variant identification","pmids":["41451456"],"confidence":"High","gaps":["Whether TNFR1 is a direct cargo of AP-1B or is mistrafficked indirectly not determined","Contribution of other inflammatory receptors to the autoinflammatory phenotype not excluded"]},{"year":2025,"claim":"A non-canonical role for AP1M2 was reported in bladder cancer, where it interacts with PUM1 to stabilize RAD54B mRNA and promote DNA repair-dependent chemoresistance, suggesting functions beyond canonical vesicular sorting.","evidence":"Co-immunoprecipitation, RNA stability assays, bladder cancer organoids, and xenograft models with drug sensitivity readouts","pmids":["40387455"],"confidence":"Medium","gaps":["RNA-binding or mRNA stabilization activity attributed to AP1M2 has no independent confirmation","Structural basis of AP1M2–PUM1 interaction unknown","Whether this function occurs in normal epithelia or is cancer-specific not addressed"]},{"year":null,"claim":"Key unresolved questions include the structural basis for AP-1B versus AP-1A cargo discrimination, the full cargo repertoire sorted by AP1M2 in different epithelial tissues, and whether the non-canonical RNA-stabilization function represents a physiologically relevant activity.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal structure of AP-1B or mu1B in complex with cargo signals","Comprehensive cargo identification by unbiased proteomics not performed","Relationship between canonical sorting defects and the PUM1/RAD54B axis unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,3,4]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[0,1,3,5]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[3,7]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,3,4,6,7]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,3,5,6]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,7]}],"complexes":["AP-1B"],"partners":["PIPKIGAMMA","TNFR1","PUM1","LDLR","PIGR","E-CADHERIN"],"other_free_text":[]},"mechanistic_narrative":"AP1M2 (mu1B) is the epithelial cell-specific medium subunit of the AP-1B clathrin adaptor complex, which directs polarized basolateral membrane sorting of cargo proteins bearing tyrosine-based sorting signals in epithelial cells. AP1M2 assembles into a distinct AP-1B complex that localizes to the trans-Golgi network and recycling endosomes, where it recognizes basolateral sorting motifs on cargo such as LDLR and E-cadherin and cooperates with PIPKIγ as a scaffold for adherens junction assembly [PMID:10535737, PMID:11157985, PMID:17261850]. In intestinal epithelial cells, AP1M2 is required for proper sorting of the polymeric immunoglobulin receptor (pIgR) and for TNFR1 endocytic trafficking; loss of AP1M2 causes pIgR mis-sorting leading to aberrant IgA glycosylation and IgA nephropathy-like disease, and triggers TNFR1-dependent NF-κB hyperactivation causing autoinflammatory colitis [PMID:39059316, PMID:41451456]. Biallelic loss-of-function mutations in AP1M2 cause a Mendelian autoinflammatory disease with colitis in humans [PMID:41451456]."},"prefetch_data":{"uniprot":{"accession":"Q9Y6Q5","full_name":"AP-1 complex subunit mu-2","aliases":["AP-mu chain family member mu1B","Adaptor protein complex AP-1 subunit mu-2","Adaptor-related protein complex 1 subunit mu-2","Clathrin assembly protein complex 1 mu-2 medium chain 2","Golgi adaptor HA1/AP1 adaptin mu-2 subunit","Mu-adaptin 2","Mu1B-adaptin"],"length_aa":423,"mass_kda":48.1,"function":"Subunit of clathrin-associated adaptor protein complex 1 that plays a role in protein sorting in the trans-Golgi network (TGN) and endosomes. The AP complexes mediate the recruitment of clathrin to membranes and the recognition of sorting signals within the cytosolic tails of transmembrane cargo molecules","subcellular_location":"Golgi apparatus; Cytoplasmic vesicle, clathrin-coated vesicle membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y6Q5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AP1M2","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AP1M2","total_profiled":1310},"omim":[{"mim_id":"614368","title":"ADAPTOR-RELATED PROTEIN COMPLEX 5, MU-1 SUBUNIT; AP5M1","url":"https://www.omim.org/entry/614368"},{"mim_id":"607309","title":"ADAPTOR-RELATED PROTEIN COMPLEX 1, MU-2 SUBUNIT; AP1M2","url":"https://www.omim.org/entry/607309"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Vesicles","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/AP1M2"},"hgnc":{"alias_symbol":["HSMU1B","mu2","AP1-mu2"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y6Q5","domains":[{"cath_id":"3.30.450.60","chopping":"6-133","consensus_level":"high","plddt":95.6466,"start":6,"end":133},{"cath_id":"2.60.40.1170","chopping":"171-274_388-421","consensus_level":"medium","plddt":93.6353,"start":171,"end":421},{"cath_id":"2.60.40.1170","chopping":"278-367_374-384","consensus_level":"medium","plddt":94.7242,"start":278,"end":384}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6Q5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6Q5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6Q5-F1-predicted_aligned_error_v6.png","plddt_mean":92.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AP1M2","jax_strain_url":"https://www.jax.org/strain/search?query=AP1M2"},"sequence":{"accession":"Q9Y6Q5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6Q5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6Q5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6Q5"}},"corpus_meta":[{"pmid":"10228163","id":"PMC_10228163","title":"Inhibition 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mapping suggests new mechanistic details underlying Alzheimer's disease.","date":"2010","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/21163940","citation_count":96,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26908601","id":"PMC_26908601","title":"Genome-wide association analysis of self-reported events in 6135 individuals and 252 827 controls identifies 8 loci associated with thrombosis.","date":"2016","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26908601","citation_count":94,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":44607,"output_tokens":2349,"usd":0.084528},"stage2":{"model":"claude-opus-4-6","input_tokens":5700,"output_tokens":1671,"usd":0.105413},"total_usd":0.43034,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":56446,"output_tokens":3312,"usd":0.109509},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6487,"output_tokens":2193,"usd":0.13089}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"AP1M2 (mu1B) is the epithelial cell-specific medium chain of the AP-1 clathrin adaptor complex; its gene (Ap1m2) was mapped to human chromosome 19p13.2 and mouse chromosome 9, and genomic structure analysis showed Ap1m1 and Ap1m2 arose from a recent gene duplication distinct from Ap2m1.\",\n      \"method\": \"Genomic cloning, chromosomal mapping, intron position comparison\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct molecular cloning and chromosomal mapping, single study\",\n      \"pmids\": [\"10640811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AP1M2 (clathrin adaptor protein complex 1 subunit mu 2) facilitates polarized protein trafficking toward the basolateral membrane in intestinal epithelial cells (IECs), contributing to epithelial barrier function. IEC-specific Ap1m2 knockout mice spontaneously developed IgA nephropathy-like features, aberrant glycosylation of IgA due to mis-sorting of polymeric immunoglobulin receptors, and intestinal dysbiosis via attenuated IL-22-STAT3 signaling.\",\n      \"method\": \"IEC-specific knockout mouse model, immunofluorescence, western blot, stereo-seq, clathrin-coated vesicle fractionation\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO mouse with multiple orthogonal mechanistic readouts, moderate evidence from single study\",\n      \"pmids\": [\"39059316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AP1M2 deficiency in intestinal epithelial cells causes accumulation of TNFR1-signaling downstream proteins (RIPK1, TBK1, IKKα/β, NEMO) in clathrin-coated vesicles, leading to enhanced NF-κB activation and chemokine overproduction; Tnfr1 knockout rescued gastrointestinal inflammation in Ap1m2-deficient mice.\",\n      \"method\": \"Ap1m2 knockout mice, genetic epistasis (Tnfr1 KO rescue), super-resolution imaging, clathrin-coated vesicle enrichment, western blot\",\n      \"journal\": \"Arthritis & rheumatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — epistasis rescue with Tnfr1 KO plus biochemical fractionation and super-resolution imaging in single rigorous study\",\n      \"pmids\": [\"41451456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AP2-μ2 (the μ2 subunit of AP-2, which is related to AP1M2 in the adaptor family context) interacts with SLC26A4 (Pendrin) in the endolymphatic sac to regulate SLC26A4 plasma membrane abundance; pharmacological inhibition of clathrin-mediated endocytosis increased apical surface SLC26A4 in mitochondria-rich cells.\",\n      \"method\": \"Co-localization (confocal), structural modeling, pharmacological inhibition of CME, viral HA-tag expression in endolymphatic sac cells\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct interaction modeled and validated pharmacologically but in AP-2 mu2 context (AP2M1), not AP1M2; included as related adaptor mu2 subunit\",\n      \"pmids\": [\"39383236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The AP-2 μ2 subunit (AP2M1) recognizes two tyrosine-based motifs in the cytoplasmic domain of N-cadherin to mediate clathrin-mediated endocytosis (CME) of N-cadherin; β-catenin inhibits this endocytosis by masking these motifs, and removal of β-catenin facilitates μ2 binding, increasing N-cadherin CME and promoting neurite outgrowth.\",\n      \"method\": \"Co-IP, mutagenesis of tyrosine motifs, live-cell endocytosis assays in neurons, β-catenin knockdown\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with mutagenesis and functional neurite outgrowth readout, single study; pertains to AP-2 mu2 (AP2M1)\",\n      \"pmids\": [\"28224728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AP1M2 interacts with the RNA-binding protein PUM1 to stabilize RAD54B mRNA, thereby supporting DNA repair and survival of bladder cancer cells under gemcitabine-cisplatin chemotherapeutic stress; inhibition of AP1M2/PUM1-mediated RAD54B expression sensitized BC xenografts to gemcitabine-cisplatin treatment in vivo.\",\n      \"method\": \"Co-immunoprecipitation, mRNA stability assays, xenograft mouse model, western blot, drug sensitivity assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP demonstrating protein complex plus in vivo xenograft rescue, single lab study\",\n      \"pmids\": [\"40387455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AP1M2 promotes HCC cell proliferation and migration through activation of the JNK/ERK signaling pathway, as demonstrated by AP1M2 knockdown and overexpression experiments in HCC cell lines.\",\n      \"method\": \"siRNA knockdown, overexpression, western blot (JNK/ERK pathway), proliferation/migration assays (EdU, CCK-8, Transwell)\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, pathway inferred from signaling blots without direct mechanistic link; no identified direct substrate or binding partner\",\n      \"pmids\": [\"39303819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HPV-16 E7 binds to the AP2-μ2 subunit via residues 25-YEQL-28 (a YXXPhi-type motif) within its CR2 domain; this interaction is modulated by CKII phosphorylation of serines 31 and 32 downstream of LXCXE, and E7 association with AP2-μ2 contributes to inhibition of EGFR internalization and cellular transformation.\",\n      \"method\": \"Co-IP, point mutagenesis, transformation assays, EGFR endocytosis measurement\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with mutagenesis and functional transformation/endocytosis readout; pertains to AP2 mu2 (AP2M1)\",\n      \"pmids\": [\"36255238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Crystal structures of AP2-μ2 in complex with HPV16 E7-derived peptides reveal that the interaction is primarily maintained by the Y-x-x-Phi motif and further supported by acidic cluster residues of E7; this AP2-μ2-binding motif is conserved across Alpha-, Beta-, and Mupapillomaviruses.\",\n      \"method\": \"X-ray crystallography, biochemical binding assays, sequence alignment\",\n      \"journal\": \"Journal of microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with biochemical validation, pertains to AP2 mu2 subunit (AP2M1)\",\n      \"pmids\": [\"40878558\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AP1M2 encodes the μ1B medium chain of the epithelial cell-specific AP-1B clathrin adaptor complex, where it directs polarized basolateral trafficking in intestinal epithelial cells; loss of AP1M2 disrupts polymeric immunoglobulin receptor sorting, impairs IL-22-STAT3 signaling, causes intestinal dysbiosis, and—by failing to remove TNFR1-pathway components (RIPK1, TBK1, IKKα/β, NEMO) via clathrin-mediated endocytosis—leads to constitutive NF-κB activation and chemokine overproduction, linking epithelial barrier dysfunction to systemic autoinflammatory disease.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper and extract discoveries only from KEEP papers.\n\n**Classification:**\n\nPapers about AP1M2 (the canonical protein — clathrin adaptor protein complex 1, mu2 subunit, epithelial-specific basolateral sorting):\n- KEEP: Papers about mu1B/AP1M2 in epithelial polarized sorting, basolateral targeting\n- KEEP: Papers about AP-2 mu2 subunit (relevant mechanistic context for understanding AP1M2 function)\n\n**EXCLUDE candidates:**\n- Reovirus μ2 protein (M1 gene product) — completely different protein (viral)\n- Opioid μ2 receptor — pharmacology, different entity\n- Drosophila MU2 (MDC1 ortholog, DNA damage) — different gene/function\n- Arabidopsis μ2 (plant AP2) — plant, but context is CME, could be ortholog... actually this is AP2M not AP1M2\n- Inorganic chemistry μ2 bridging ligands — clearly unrelated\n- GST Mu2 (glutathione S-transferase mu2) — different gene (GSTM2)\n- Bacteriophage mu2 — unrelated\n- Zea mays Mu2 transposon — unrelated\n- Papers about AP-2 μ2 subunit (AP2M1/mu2) — these are about a paralog (AP-2 complex mu2), not AP1M2\n\nAfter careful review, AP1M2 = mu1B (the AP-1B complex mu subunit, epithelial-specific). Key papers are those about mu1B specifically.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"mu1B (AP1M2) is an epithelial cell-specific homolog of mu1A that assembles into a novel form of the AP-1 clathrin adaptor complex (AP-1B). Expression of mu1B in LLC-PK1 kidney epithelial cells, which normally lack mu1B and missort basolateral proteins apically, selectively restores basolateral targeting of membrane proteins without affecting apical targeting, establishing AP1M2 as the critical subunit mediating basolateral sorting in polarized epithelial cells.\",\n      \"method\": \"Stable transfection of mu1B into LLC-PK1 cells, immunofluorescence, flow cytometry, functional sorting assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean gain-of-function in defined cell system with specific polarized sorting phenotype, seminal discovery paper with 432 citations\",\n      \"pmids\": [\"10535737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"mu1B (AP1M2) is a novel member of the adaptor medium chain family with 79% amino acid sequence identity to mu1A, expressed specifically in a subset of polarized epithelial and exocrine cells (not ubiquitously). Yeast two-hybrid analyses demonstrate that mu1B interacts with generic tyrosine-based sorting signals, consistent with a role in polarized protein sorting.\",\n      \"method\": \"Northern blotting, in situ hybridization, yeast two-hybrid interaction assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific expression confirmed by multiple methods, direct binding to sorting signals demonstrated; 212 citations\",\n      \"pmids\": [\"10338135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The genomic structure of Ap1m2 (mu1B) was determined: the gene contains introns at identical positions to Ap1m1 (mu1A), consistent with origin by relatively recent gene duplication. AP1M2 was mapped to human chromosome 19p13.2 and mouse chromosome 9 (proximal region), regions known to be syntenic.\",\n      \"method\": \"Genomic cloning, intron mapping, chromosomal mapping (FISH/radiation hybrid)\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct genomic structural analysis; provides evolutionary context but limited functional mechanism\",\n      \"pmids\": [\"10640811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"AP-1B (containing AP1M2/mu1B) localizes to the trans-Golgi network and recycling endosomes, specifically to subdomains of the TGN distinct from those occupied by AP-1A. AP-1B interacts with basolateral cargo such as LDLR and with clathrin in the TGN, mediating sorting of basolateral proteins away from apical and AP-1A-selected endolysosomal proteins.\",\n      \"method\": \"Immunofluorescence, immunoelectron microscopy of epitope-tagged mu1A and mu1B in LLC-PK1 cells, co-localization with furin and LDLR\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct subcellular localization by immunoelectron microscopy with functional sorting readout, 208 citations\",\n      \"pmids\": [\"11157985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Type Igamma phosphatidylinositol phosphate kinase (PIPKIgamma) directly binds to the mu1B (AP1M2) subunit of AP-1B and acts as a signalling scaffold linking AP-1B to E-cadherin for basolateral trafficking. Disruption of PIPKIgamma binding to mu1B impairs E-cadherin transport and blocks adherens junction assembly. A hereditary gastric cancer-associated E-cadherin mutation that loses PIPKIgamma binding shows disrupted basolateral membrane targeting.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, siRNA knockdown, dominant-negative constructs, fluorescence microscopy, in vitro binding assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, functional rescue, disease mutation validation; multiple orthogonal methods; 145 citations\",\n      \"pmids\": [\"17261850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AP1M2 (mu1B) interacts with the tyrosine-sorting motif YMPL of Arabidopsis vacuolar sorting receptor VSR4 through the mu-homology domain of AP1M2. Mutation of YMPL attenuates this interaction (shown by bimolecular fluorescence complementation), and disruption of the tyrosine-sorting motif alters VSR4 localization (increased plasma membrane or vacuolar accumulation), demonstrating the role of the AP1M2 tyrosine-motif binding site in post-Golgi sorting.\",\n      \"method\": \"Bimolecular fluorescence complementation (BiFC/V10-BiFC system), site-directed mutagenesis, confocal microscopy\",\n      \"journal\": \"Bioscience, biotechnology, and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, BiFC interaction assay with mutagenesis; plant system may not fully reflect mammalian AP1M2\",\n      \"pmids\": [\"26745465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Intestinal epithelial cell-specific deletion of Ap1m2 in mice (Ap1m2ΔIEC) causes spontaneous IgA nephropathy-like disease. Mechanistically, AP1M2 deficiency leads to mis-sorting of polymeric immunoglobulin receptors (pIgR) in intestinal epithelial cells, resulting in downregulation and aberrant localization of pIgR and consequently elevated aberrantly glycosylated IgA in serum. AP1M2 deficiency also disrupts IL-22-STAT3 signaling in the intestine, causing dysbiosis that further promotes aberrant IgA glycosylation and renal IgA deposition.\",\n      \"method\": \"Intestinal epithelium-specific Ap1m2 knockout mice, immunofluorescence, flow cytometry, antibiotic treatment experiments, serum IgA glycosylation analysis, kidney pathology\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with defined molecular mechanism (pIgR mis-sorting), multiple orthogonal phenotypic readouts\",\n      \"pmids\": [\"39059316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AP1M2 deficiency (biallelic loss-of-function) causes a new autoinflammatory disease with colitis in humans and mice. Mechanistically, AP1M2 deficiency in intestinal epithelial cells leads to accumulation of TNFR1 signaling downstream proteins (RIPK1, TBK1, IKKα/β, NEMO) in clathrin-coated vesicles, causing enhanced NF-κB activation and chemokine overproduction. Knockout of Tnfr1 rescued the gastrointestinal inflammation, demonstrating that AP1M2-mediated TNFR1 endocytic trafficking suppresses NF-κB-driven intestinal inflammation.\",\n      \"method\": \"Ap1m2-/- and Ap1m2-/-::Tnfr1-/- mouse models, super-resolution imaging, clathrin-coated vesicle enrichment, Western blot, Stereo-seq, genetic epistasis (Tnfr1 KO rescue)\",\n      \"journal\": \"Arthritis & rheumatology (Hoboken, N.J.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic epistasis (double KO rescue), super-resolution imaging, biochemical fractionation, and human patient variant all converging on one mechanism\",\n      \"pmids\": [\"41451456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AP1M2 promotes gemcitabine-cisplatin chemoresistance in bladder cancer by interacting with the RNA-binding protein PUM1 to stabilize RAD54B mRNA, thereby enhancing DNA repair and cell survival under chemotherapeutic stress. Inhibition of AP1M2 or the AP1M2/PUM1/RAD54B axis sensitized bladder cancer xenografts to gemcitabine-cisplatin treatment in vivo.\",\n      \"method\": \"Co-immunoprecipitation, bladder cancer organoid model with drug sensitivity assays, Western blot, xenograft mouse model, RNA stability assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP interaction, in vivo xenograft validation; single lab but multiple methods including in vivo rescue\",\n      \"pmids\": [\"40387455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HIV-1 Nef disrupts MHC-I trafficking to the cell surface by recruiting AP-1 (containing mu1 subunit) to the MHC-I cytoplasmic tail and rerouting newly synthesized MHC-I from the TGN to lysosomes; this mechanism depends on expression of the mu1 subunit of AP-1A. Nef promotes a physical interaction between endogenous AP-1 and MHC-I via a novel AP-1 binding site in the MHC-I cytoplasmic tail.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins in HIV-infected primary T cells, siRNA knockdown of mu1, confocal microscopy, flow cytometry\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — endogenous co-IP in primary cells, siRNA epistasis; however this paper focuses on AP-1A (mu1A) not AP1M2 specifically\",\n      \"pmids\": [\"15569716\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AP1M2 (mu1B) is the epithelial cell-specific mu subunit of the AP-1B clathrin adaptor complex that localizes to the TGN and recycling endosomes, where it recognizes tyrosine-based sorting signals on basolateral cargo proteins to mediate polarized basolateral membrane targeting; additionally, AP1M2 regulates TNFR1 endocytic trafficking in intestinal epithelial cells to suppress NF-κB activation and prevent autoinflammation, facilitates proper sorting of polymeric immunoglobulin receptors to maintain intestinal barrier integrity, and interacts with PUM1 to stabilize RAD54B mRNA and modulate DNA damage responses in cancer cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"AP1M2 encodes the μ1B medium chain of the epithelial-specific AP-1B clathrin adaptor complex and directs polarized basolateral membrane trafficking in intestinal epithelial cells. AP1M2 sorts the polymeric immunoglobulin receptor and supports IL-22–STAT3 signaling; its loss causes intestinal dysbiosis, aberrant IgA glycosylation, and IgA nephropathy-like disease in mice [PMID:39059316]. AP1M2 also mediates clathrin-dependent removal of TNFR1-pathway components (RIPK1, TBK1, IKKα/β, NEMO), and its deficiency leads to constitutive NF-κB activation and chemokine overproduction—a phenotype rescued by Tnfr1 knockout—linking epithelial trafficking to systemic autoinflammation [PMID:41451456]. Additionally, AP1M2 interacts with the RNA-binding protein PUM1 to stabilize RAD54B mRNA, supporting DNA repair in bladder cancer cells under chemotherapeutic stress [PMID:40387455].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of AP1M2 as an epithelial-specific μ1 chain paralog established the existence of a tissue-restricted AP-1B adaptor complex distinct from ubiquitous AP-1A.\",\n      \"evidence\": \"Genomic cloning, chromosomal mapping, and intron-position analysis showing Ap1m1/Ap1m2 gene duplication\",\n      \"pmids\": [\"10640811\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional data on cargo sorting by μ1B at this stage\",\n        \"Expression pattern across epithelial tissues not fully characterized\",\n        \"No protein-level confirmation of AP-1B complex assembly\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"IEC-specific knockout demonstrated that AP1M2 is required for basolateral sorting of the polymeric immunoglobulin receptor, IL-22–STAT3 signaling, and maintenance of intestinal homeostasis, establishing its first in vivo physiological functions and linking its loss to IgA nephropathy-like disease.\",\n      \"evidence\": \"IEC-specific Ap1m2 knockout mice with immunofluorescence, western blot, stereo-seq, and clathrin-coated vesicle fractionation\",\n      \"pmids\": [\"39059316\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct cargo recognition motifs bound by μ1B not identified\",\n        \"Mechanism linking AP1M2 loss to aberrant IgA glycosylation is indirect\",\n        \"Whether AP1M2 functions equivalently in non-intestinal epithelia remains untested\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Genetic epistasis and super-resolution imaging revealed that AP1M2 prevents pathological NF-κB activation by clearing TNFR1-signaling components from clathrin-coated vesicles, providing a direct mechanistic link between epithelial trafficking and autoinflammation.\",\n      \"evidence\": \"Ap1m2 KO mice rescued by Tnfr1 KO, super-resolution imaging, clathrin-coated vesicle enrichment, western blot\",\n      \"pmids\": [\"41451456\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether AP1M2 directly recognizes TNFR1 or acts indirectly through cargo sorting is unresolved\",\n        \"Structural basis of μ1B cargo selectivity versus μ1A unknown\",\n        \"Contribution of other AP-1B subunits to TNFR1 pathway clearance not dissected\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A non-canonical role for AP1M2 was identified in mRNA stabilization: AP1M2 binds PUM1 to protect RAD54B mRNA, supporting DNA repair and chemoresistance in bladder cancer, expanding AP1M2 function beyond vesicle trafficking.\",\n      \"evidence\": \"Co-immunoprecipitation, mRNA stability assays, bladder cancer xenograft model with gemcitabine-cisplatin treatment\",\n      \"pmids\": [\"40387455\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether PUM1 interaction involves the canonical cargo-binding domain of μ1B is unknown\",\n        \"Not independently replicated; single-lab study\",\n        \"Relevance of this RNA-stabilization role in normal epithelial physiology untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for AP1M2 (μ1B) cargo selectivity versus the ubiquitous μ1A subunit, the full repertoire of basolateral cargoes sorted by AP-1B, and the physiological significance of the non-canonical PUM1 interaction remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal structure of μ1B or μ1B–cargo complex available\",\n        \"Systematic identification of AP-1B–dependent cargoes not performed\",\n        \"Whether AP1M2 mRNA-stabilization function occurs in non-cancer contexts is unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [\n      \"AP-1B\"\n    ],\n    \"partners\": [\n      \"PUM1\",\n      \"RIPK1\",\n      \"TNFR1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"AP1M2 (mu1B) is the epithelial cell-specific medium subunit of the AP-1B clathrin adaptor complex, which directs polarized basolateral membrane sorting of cargo proteins bearing tyrosine-based sorting signals in epithelial cells. AP1M2 assembles into a distinct AP-1B complex that localizes to the trans-Golgi network and recycling endosomes, where it recognizes basolateral sorting motifs on cargo such as LDLR and E-cadherin and cooperates with PIPKIγ as a scaffold for adherens junction assembly [PMID:10535737, PMID:11157985, PMID:17261850]. In intestinal epithelial cells, AP1M2 is required for proper sorting of the polymeric immunoglobulin receptor (pIgR) and for TNFR1 endocytic trafficking; loss of AP1M2 causes pIgR mis-sorting leading to aberrant IgA glycosylation and IgA nephropathy-like disease, and triggers TNFR1-dependent NF-κB hyperactivation causing autoinflammatory colitis [PMID:39059316, PMID:41451456]. Biallelic loss-of-function mutations in AP1M2 cause a Mendelian autoinflammatory disease with colitis in humans [PMID:41451456].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of AP1M2 as an epithelial-specific AP-1 medium chain resolved how polarized epithelial cells selectively sort basolateral cargo, establishing that a tissue-specific adaptor subunit swap (mu1B for mu1A) creates a functionally distinct AP-1B complex.\",\n      \"evidence\": \"Cloning, expression profiling (Northern, in situ hybridization), yeast two-hybrid binding to tyrosine-based signals, and gain-of-function transfection into mu1B-deficient LLC-PK1 cells restoring basolateral sorting\",\n      \"pmids\": [\"10535737\", \"10338135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of mu1B versus mu1A cargo discrimination not determined\", \"Endogenous regulatory mechanisms controlling AP1M2 expression unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that AP-1B localizes to distinct TGN and recycling endosome subdomains, separate from AP-1A, established the compartmental basis for how the two AP-1 variants sort different cargo classes (basolateral versus endolysosomal).\",\n      \"evidence\": \"Immunoelectron microscopy and co-localization with furin and LDLR in LLC-PK1 cells expressing epitope-tagged mu1A or mu1B\",\n      \"pmids\": [\"11157985\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism specifying AP-1B to basolateral TGN subdomains versus AP-1A to other TGN subdomains not identified\", \"Recycling endosome sorting function not functionally dissected from TGN sorting\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that PIPKIγ binds mu1B directly and scaffolds E-cadherin to AP-1B revealed how a lipid kinase coordinates cargo selection with basolateral targeting, linking AP1M2 to adherens junction biogenesis and explaining a hereditary gastric cancer E-cadherin mutation.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, yeast two-hybrid, siRNA knockdown, dominant-negative constructs, and disease mutation analysis\",\n      \"pmids\": [\"17261850\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PIPKIγ enzymatic product (PI(4,5)P2) is required at the sorting step or only the scaffolding interaction is unclear\", \"Full set of cargoes that require PIPKIγ–mu1B scaffolding not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Intestinal epithelial-specific Ap1m2 knockout revealed that AP1M2-mediated pIgR sorting is essential for mucosal IgA transport and that its loss causes systemic IgA nephropathy-like disease through aberrant IgA glycosylation and dysbiosis, extending AP1M2 function beyond local membrane sorting to systemic immune homeostasis.\",\n      \"evidence\": \"Conditional intestinal epithelial Ap1m2 knockout mice with serum IgA glycosylation analysis, kidney pathology, and antibiotic rescue experiments\",\n      \"pmids\": [\"39059316\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise step in pIgR trafficking disrupted by AP1M2 loss (TGN exit versus recycling endosome sorting) not resolved\", \"Whether AP1M2 deficiency in non-intestinal epithelia contributes to IgA nephropathy unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of AP1M2 as the critical regulator of TNFR1 endocytic trafficking in intestinal epithelium, with biallelic loss-of-function causing human autoinflammatory colitis rescued by Tnfr1 knockout, established a direct link between AP-1B-mediated receptor endocytosis and inflammatory signaling control.\",\n      \"evidence\": \"Ap1m2 knockout and Ap1m2/Tnfr1 double-knockout mice, super-resolution imaging of clathrin-coated vesicles, biochemical fractionation, human patient variant identification\",\n      \"pmids\": [\"41451456\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TNFR1 is a direct cargo of AP-1B or is mistrafficked indirectly not determined\", \"Contribution of other inflammatory receptors to the autoinflammatory phenotype not excluded\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A non-canonical role for AP1M2 was reported in bladder cancer, where it interacts with PUM1 to stabilize RAD54B mRNA and promote DNA repair-dependent chemoresistance, suggesting functions beyond canonical vesicular sorting.\",\n      \"evidence\": \"Co-immunoprecipitation, RNA stability assays, bladder cancer organoids, and xenograft models with drug sensitivity readouts\",\n      \"pmids\": [\"40387455\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RNA-binding or mRNA stabilization activity attributed to AP1M2 has no independent confirmation\", \"Structural basis of AP1M2–PUM1 interaction unknown\", \"Whether this function occurs in normal epithelia or is cancer-specific not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for AP-1B versus AP-1A cargo discrimination, the full cargo repertoire sorted by AP1M2 in different epithelial tissues, and whether the non-canonical RNA-stabilization function represents a physiologically relevant activity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of AP-1B or mu1B in complex with cargo signals\", \"Comprehensive cargo identification by unbiased proteomics not performed\", \"Relationship between canonical sorting defects and the PUM1/RAD54B axis unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 3, 4]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [0, 1, 3, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [3, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 3, 4, 6, 7]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 3, 5, 6]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 7]}\n    ],\n    \"complexes\": [\"AP-1B\"],\n    \"partners\": [\"PIPKIgamma\", \"TNFR1\", \"PUM1\", \"LDLR\", \"pIgR\", \"E-cadherin\"],\n    \"other_free_text\": []\n  }\n}\n```"}