{"gene":"AP3B1","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":1999,"finding":"AP3B1 (beta3A subunit) is a core component of the AP-3 adaptor complex that regulates protein trafficking in the trans-Golgi network/endosomal compartments; mutations (large internal tandem duplication and deletion) in two pearl alleles abrogate beta3A function, causing defective biogenesis of lysosomes, melanosomes, and platelet-dense granules.","method":"Positional/candidate cloning, mutation identification in two alleles, expression analysis in kidney tissue","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — positional cloning with mutation identification replicated across two alleles, independently confirmed by multiple subsequent studies","pmids":["9931340"],"is_preprint":false},{"year":2000,"finding":"Homologous-recombination knockout of Ap3b1 in mice confirms it is the causal gene for the pearl phenotype; loss of AP3B1 causes mislocalization of lysosomal membrane proteins LAMP-I and LAMP-II (clustered on cell surface) and melanosomal membrane protein tyrosinase in fibroblasts and melanocytes, consistent with an alternate plasma-membrane trafficking pathway for AP-3 cargo.","method":"Homologous recombination knockout, compound heterozygote rescue, immunofluorescence localization of LAMP-I, LAMP-II, and tyrosinase","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic null generated by homologous recombination with direct protein localization assay; complemented by compound heterozygote confirmation","pmids":["11058094"],"is_preprint":false},{"year":2002,"finding":"Complete loss of AP3B1 (beta3A) protein due to nonsense mutations leads to co-depletion of the associated mu3 subunit of AP-3, and causes robust aberrant trafficking of LAMP-3 (a lysosomal membrane protein) to the plasma membrane instead of directly to the lysosome, demonstrating that AP3B1 is required for direct TGN-to-lysosome routing of integral lysosomal membrane proteins.","method":"Patient cell biology: immunoblotting for AP-3 subunits, immunofluorescence/cell-surface trafficking assay for LAMP-3 in fibroblasts from AP3B1-null patient","journal":"Pediatric research","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional cell biology in human null patient cells, replicated across multiple labs","pmids":["11809908"],"is_preprint":false},{"year":2006,"finding":"A homozygous genomic deletion causing in-frame skipping of exon 15 in AP3B1 perturbs AP-3 heterotetrameric complex assembly and causes aberrant trafficking of the transmembrane lysosomal protein CD63; in basal keratinocytes, incorporated immature melanosomes are rapidly degraded in large phagolysosomes.","method":"Genetic linkage analysis, targeted gene sequencing, immunofluorescence for CD63 trafficking, electron microscopy of keratinocytes","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — patient genetics with direct functional cell biology (CD63 trafficking assay, EM), single lab but two orthogonal methods","pmids":["16537806"],"is_preprint":false},{"year":2009,"finding":"AP3B1 (beta3A subunit of AP-3) is a substrate for IP7-mediated pyrophosphorylation on a prephosphorylated serine residue; Kif3A (a kinesin-superfamily motor protein) is identified as an AP3B1-binding partner, and IP7-mediated pyrophosphorylation of AP3B1 modulates its interaction with Kif3A, which in turn affects HIV-1 Gag release.","method":"IP7-mediated pyrophosphorylation assay in vitro, co-immunoprecipitation of AP3B1 and Kif3A, HIV-1 virus-like particle release assay with AP-3 complex perturbation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical pyrophosphorylation assay plus Co-IP for binding partner, single lab, two orthogonal methods","pmids":["19934039"],"is_preprint":false},{"year":2009,"finding":"Loss-of-function mutations in AP3B1 cause defective cytotoxic T-lymphocyte (CTL) granule secretion (increased cell-surface CD63, reduced cytotoxicity) and platelet dense granule defects (impaired aggregation, reduced 3H-serotonin uptake), establishing AP3B1/AP-3 as required for biogenesis and/or function of secretory lysosomes in CTLs and platelet dense granules.","method":"Patient-derived CTL clones: CD63 surface expression assay, cytotoxicity assay; platelet aggregation and 3H-serotonin uptake assay","journal":"Haematologica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays in patient-derived cells, two orthogonal readouts, single lab","pmids":["19679886"],"is_preprint":false},{"year":2004,"finding":"A frameshift insertion in a homopolymeric adenine tract in exon 21 of the canine AP3B1 gene is the causative mutation in canine cyclic neutropenia; transcriptional slippage at this polyA tract generates both mutant and wild-type transcripts from homozygous mutant alleles, a consequence of transcriptional infidelity through homopolymeric sequences.","method":"RT-PCR subclone analysis of heterozygous and homozygous dogs, in vitro reporter assay for transcriptional slippage","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reporter assay plus RT-PCR analysis, single lab, two orthogonal methods confirming mechanistic basis","pmids":["15576359"],"is_preprint":false},{"year":2014,"finding":"In pearl (Ap3b1 mutant) eyes, hypopigmentation is more severe than in pale ear (Hps1 mutant) mice, total tyrosinase activity is higher (suggesting weaker degradation of aberrantly transported tyrosinase), and double heterozygous Hps1/Ap3b1 mice show iris hypopigmentation more severe than either single mutant, indicating that AP3B1 and HPS1 operate in distinct but synergistic pathways for ocular melanosome biogenesis and tyrosinase distribution.","method":"Comparative pigmentation analysis in single and double mutant mice, tyrosinase activity assay, histology","journal":"Experimental eye research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with double-mutant analysis plus enzymatic activity assay, single lab","pmids":["25160823"],"is_preprint":false},{"year":2019,"finding":"AP3B1 mutation in pearl mice causes delayed testis development, reduced sperm count, and lower testosterone concentrations during spermatogenesis, and pe males show reduced lysosomes in Sertoli cells, establishing a role for AP3B1/AP-3 in male reproductive development distinct from HPS1.","method":"Comparative analysis of pe and ep mutant mice: sperm count, testosterone measurement, electron microscopy of sperm tails, litter size analysis","journal":"Reproduction, fertility, and development","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — phenotypic characterization in mutant mice with EM and hormonal assays, single lab, no direct molecular mechanism shown","pmids":["30786955"],"is_preprint":false},{"year":2024,"finding":"AP3B1 interacts with PDIA3/ERP57 and is indispensable for PDIA3-triggered selective autophagy-mediated degradation of rabies virus G protein, thereby restricting RABV infection; AP3B1 was identified by affinity tag-purification mass spectrometry as a PDIA3 interactor and its requirement was confirmed by knockout experiments.","method":"Affinity tag-purification mass spectrometry, co-immunoprecipitation, AP3B1 knockout cell functional assay for RABV G protein degradation","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — AP-MS identification plus Co-IP plus KO functional assay, single lab, two orthogonal methods","pmids":["39128851"],"is_preprint":false},{"year":2024,"finding":"AP3B1 physically interacts with the SARS-CoV-2 envelope (E) protein in infected cells and acts as an antiviral factor: overexpression of AP3B1 suppresses SARS-CoV-2 replication, while siRNA-mediated depletion increases release of infectious virus, demonstrating an intrinsic antiviral barrier function of AP3B1.","method":"Immunoprecipitation and immunofluorescence in virus-infected cells, AP3B1 overexpression and siRNA knockdown with viral replication quantification","journal":"Viruses","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — confirmed interaction by IP and IFA, gain- and loss-of-function with viral output readout, single lab, two orthogonal methods","pmids":["39339853"],"is_preprint":false}],"current_model":"AP3B1 encodes the β3A subunit of the heterotetrameric AP-3 adaptor complex, which functions as a coat protein mediating vesicle formation from the trans-Golgi network/endosomes to direct transmembrane cargo (including LAMP-1, LAMP-2, LAMP-3, CD63, and tyrosinase) to lysosomes and lysosome-related organelles (melanosomes, platelet dense granules, CTL secretory lysosomes); loss of AP3B1 destabilizes other AP-3 subunits (e.g., mu3), misdirects lysosomal membrane proteins to the plasma membrane, and impairs biogenesis of multiple lysosome-related organelles, while AP3B1 is also subject to IP7-mediated pyrophosphorylation that modulates its interaction with the kinesin motor Kif3A to regulate intracellular trafficking, and participates in antiviral defense by interacting with viral proteins (SARS-CoV-2 E protein, RABV G protein degradation via PDIA3-mediated selective autophagy)."},"narrative":{"mechanistic_narrative":"AP3B1 encodes the β3A subunit of the heterotetrameric AP-3 adaptor complex, which mediates the direct sorting of integral membrane cargo from the trans-Golgi network/endosomal system to lysosomes and lysosome-related organelles [PMID:9931340, PMID:11809908]. Loss of AP3B1 destabilizes the complex—co-depleting the associated μ3 subunit [PMID:11809908]—and reroutes lysosomal membrane proteins including LAMP-1, LAMP-2, LAMP-3, CD63, and the melanosomal protein tyrosinase to the plasma membrane, demonstrating that AP3B1 enforces a direct intracellular routing pathway distinct from a default surface route [PMID:11058094, PMID:11809908, PMID:16537806]. Through this trafficking function AP3B1 is required for the biogenesis and function of multiple lysosome-related organelles: defects cause hypopigmented melanosomes, impaired platelet dense granules, and defective cytotoxic T-lymphocyte secretory lysosomes, the cellular basis of the pearl phenotype and Hermansky-Pudlak-type disease [PMID:9931340, PMID:19679886]. Genetic studies place AP3B1 in a pathway distinct from but synergistic with HPS1 for ocular melanosome biogenesis [PMID:25160823]. AP3B1 is a substrate for IP7-mediated pyrophosphorylation on a prephosphorylated serine, and this modification modulates its interaction with the kinesin motor Kif3A [PMID:19934039]. Beyond canonical trafficking, AP3B1 functions in antiviral defense, physically interacting with the SARS-CoV-2 envelope protein to restrict viral replication [PMID:39339853] and acting with PDIA3/ERP57 in selective autophagy-mediated degradation of the rabies virus G protein [PMID:39128851].","teleology":[{"year":1999,"claim":"Established AP3B1 as a core AP-3 adaptor subunit whose loss disrupts biogenesis of lysosomes, melanosomes, and platelet-dense granules, defining its identity as a trafficking gene.","evidence":"Positional/candidate cloning and mutation identification in two pearl alleles, with expression analysis","pmids":["9931340"],"confidence":"High","gaps":["Did not resolve the molecular sorting step (direct vs. alternate routing)","No cargo-level trafficking assay"]},{"year":2000,"claim":"Confirmed AP3B1 as the causal pearl gene and showed loss mislocalizes LAMP-I, LAMP-II, and tyrosinase to the cell surface, revealing an alternate plasma-membrane route for AP-3 cargo.","evidence":"Homologous-recombination knockout mice with compound heterozygote rescue and immunofluorescence cargo localization","pmids":["11058094"],"confidence":"High","gaps":["Did not address effects on other AP-3 subunits","Mechanism of the alternate route not defined"]},{"year":2002,"claim":"Demonstrated in human null patient cells that loss of β3A co-depletes the μ3 subunit and aberrantly routes LAMP-3 to the plasma membrane, establishing AP3B1 as required for direct TGN-to-lysosome cargo delivery.","evidence":"Patient fibroblast immunoblotting for AP-3 subunits and cell-surface trafficking assay for LAMP-3","pmids":["11809908"],"confidence":"High","gaps":["Did not map the cargo-recognition determinants","Structural basis of complex destabilization not shown"]},{"year":2006,"claim":"Showed that an in-frame exon-skipping deletion perturbs AP-3 heterotetramer assembly and misroutes CD63, linking complex integrity to cargo sorting and to rapid degradation of immature melanosomes in keratinocytes.","evidence":"Patient genetics with CD63 immunofluorescence trafficking assay and electron microscopy","pmids":["16537806"],"confidence":"High","gaps":["Single-lab functional data","Fate of misrouted CD63 not fully tracked"]},{"year":2009,"claim":"Identified a post-translational regulatory layer: AP3B1 is pyrophosphorylated by IP7 on a prephosphorylated serine, and this modulates binding to the kinesin Kif3A, coupling AP-3 to motor-driven trafficking.","evidence":"In vitro IP7 pyrophosphorylation assay, AP3B1-Kif3A co-immunoprecipitation, and HIV-1 VLP release assay","pmids":["19934039"],"confidence":"Medium","gaps":["Single lab; in vitro pyrophosphorylation","Functional consequence of Kif3A binding in vivo not fully resolved"]},{"year":2009,"claim":"Extended the lysosome-related organelle role to immune and hemostatic cells, showing AP3B1 loss impairs CTL secretory-lysosome function and platelet dense granule activity.","evidence":"Patient-derived CTL clones (CD63 surface, cytotoxicity) and platelet aggregation/serotonin uptake assays","pmids":["19679886"],"confidence":"Medium","gaps":["Single lab","Biogenesis vs. secretion defect not disentangled"]},{"year":2004,"claim":"Characterized a canine AP3B1 frameshift in a homopolymeric tract as the cause of cyclic neutropenia, with transcriptional slippage producing mixed transcripts, illustrating mutational mechanism in this gene.","evidence":"RT-PCR subclone analysis and in vitro reporter assay for transcriptional slippage","pmids":["15576359"],"confidence":"Medium","gaps":["Mechanistic link to neutrophil cycling not established","Model-organism mutation, not human cargo biology"]},{"year":2014,"claim":"Genetic epistasis placed AP3B1 and HPS1 in distinct but synergistic pathways for ocular melanosome biogenesis and tyrosinase distribution.","evidence":"Single and double mutant mouse pigmentation analysis, tyrosinase activity assay, histology","pmids":["25160823"],"confidence":"Medium","gaps":["Molecular basis of pathway divergence not defined","Single lab"]},{"year":2019,"claim":"Implicated AP3B1 in male reproductive development, with pearl mice showing delayed testis development and reduced Sertoli-cell lysosomes.","evidence":"Phenotypic characterization of mutant mice (sperm count, testosterone, EM)","pmids":["30786955"],"confidence":"Low","gaps":["No direct molecular mechanism shown","Single lab phenotypic study","Lysosome defect causal link not established"]},{"year":2024,"claim":"Revealed an antiviral role: AP3B1 interacts with the SARS-CoV-2 E protein and restricts replication, and acts with PDIA3 to drive selective autophagy of the rabies virus G protein.","evidence":"IP/IFA in infected cells with gain/loss-of-function viral output; AP-MS, Co-IP, and KO functional assay for RABV G degradation","pmids":["39339853","39128851"],"confidence":"Medium","gaps":["Mechanistic link between trafficking function and viral restriction not defined","Single lab per virus","Whether AP-3 complex integrity is required not tested"]},{"year":null,"claim":"How AP-3 cargo-recognition specificity, IP7/Kif3A regulation, and the newly described antiviral functions integrate at the structural and pathway level remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the AP-3 cargo-binding interface in the timeline","Mechanism connecting trafficking to viral restriction unknown","In vivo role of pyrophosphorylation undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[1,2,3]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,1,2,3]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,2,3]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,3,5]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[9]}],"complexes":["AP-3 adaptor complex"],"partners":["AP3M1","KIF3A","PDIA3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00203","full_name":"AP-3 complex subunit beta-1","aliases":["Adaptor protein complex AP-3 subunit beta-1","Adaptor-related protein complex 3 subunit beta-1","Beta-3A-adaptin","Clathrin assembly protein complex 3 beta-1 large chain"],"length_aa":1094,"mass_kda":121.3,"function":"Subunit of non-clathrin- and clathrin-associated adaptor protein complex 3 (AP-3) that plays a role in protein sorting in the late-Golgi/trans-Golgi network (TGN) and/or endosomes. The AP complexes mediate both the recruitment of clathrin to membranes and the recognition of sorting signals within the cytosolic tails of transmembrane cargo molecules. AP-3 appears to be involved in the sorting of a subset of transmembrane proteins targeted to lysosomes and lysosome-related organelles. In concert with the BLOC-1 complex, AP-3 is required to target cargos into vesicles assembled at cell bodies for delivery into neurites and nerve terminals","subcellular_location":"Cytoplasmic vesicle, clathrin-coated vesicle membrane; Golgi apparatus","url":"https://www.uniprot.org/uniprotkb/O00203/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AP3B1","classification":"Not Classified","n_dependent_lines":135,"n_total_lines":1208,"dependency_fraction":0.11175496688741722},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AP3B1","total_profiled":1310},"omim":[{"mim_id":"618807","title":"LIPOPROTEIN(a) QUANTITATIVE TRAIT LOCUS; LPAQTL","url":"https://www.omim.org/entry/618807"},{"mim_id":"610366","title":"ADAPTOR-RELATED PROTEIN COMPLEX 3, MU-1 SUBUNIT; AP3M1","url":"https://www.omim.org/entry/610366"},{"mim_id":"609763","title":"PHOSPHATIDYLINOSITOL 4-KINASE, TYPE 2, ALPHA; PI4K2A","url":"https://www.omim.org/entry/609763"},{"mim_id":"608233","title":"HERMANSKY-PUDLAK SYNDROME 2; HPS2","url":"https://www.omim.org/entry/608233"},{"mim_id":"607246","title":"ADAPTOR-RELATED PROTEIN COMPLEX 3, DELTA-1 SUBUNIT; AP3D1","url":"https://www.omim.org/entry/607246"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Nuclear membrane","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/AP3B1"},"hgnc":{"alias_symbol":["ADTB3A","HPS2"],"prev_symbol":[]},"alphafold":{"accession":"O00203","domains":[{"cath_id":"1.25.10.10","chopping":"44-254","consensus_level":"medium","plddt":92.1208,"start":44,"end":254},{"cath_id":"2.60.40.1150","chopping":"872-978","consensus_level":"high","plddt":91.8781,"start":872,"end":978},{"cath_id":"3.30.310.10","chopping":"984-1093","consensus_level":"high","plddt":88.182,"start":984,"end":1093},{"cath_id":"1.25.40","chopping":"477-616","consensus_level":"medium","plddt":88.2525,"start":477,"end":616}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00203","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00203-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00203-F1-predicted_aligned_error_v6.png","plddt_mean":75.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AP3B1","jax_strain_url":"https://www.jax.org/strain/search?query=AP3B1"},"sequence":{"accession":"O00203","fasta_url":"https://rest.uniprot.org/uniprotkb/O00203.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00203/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00203"}},"corpus_meta":[{"pmid":"9931340","id":"PMC_9931340","title":"The beta3A subunit gene (Ap3b1) of the AP-3 adaptor complex is altered in the mouse hypopigmentation mutant pearl, a model for Hermansky-Pudlak syndrome and night blindness.","date":"1999","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9931340","citation_count":214,"is_preprint":false},{"pmid":"11809908","id":"PMC_11809908","title":"Nonsense mutations in ADTB3A cause complete deficiency of the beta3A subunit of adaptor complex-3 and severe Hermansky-Pudlak syndrome type 2.","date":"2002","source":"Pediatric research","url":"https://pubmed.ncbi.nlm.nih.gov/11809908","citation_count":119,"is_preprint":false},{"pmid":"19934039","id":"PMC_19934039","title":"Inositol pyrophosphate mediated pyrophosphorylation of AP3B1 regulates HIV-1 Gag release.","date":"2009","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/19934039","citation_count":114,"is_preprint":false},{"pmid":"16537806","id":"PMC_16537806","title":"Identification of a homozygous deletion in the AP3B1 gene causing Hermansky-Pudlak syndrome, type 2.","date":"2006","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/16537806","citation_count":92,"is_preprint":false},{"pmid":"11058094","id":"PMC_11058094","title":"Defective organellar membrane protein trafficking in Ap3b1-deficient cells.","date":"2000","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/11058094","citation_count":65,"is_preprint":false},{"pmid":"19679886","id":"PMC_19679886","title":"Two patients with Hermansky Pudlak syndrome type 2 and novel mutations in AP3B1.","date":"2009","source":"Haematologica","url":"https://pubmed.ncbi.nlm.nih.gov/19679886","citation_count":43,"is_preprint":false},{"pmid":"33867526","id":"PMC_33867526","title":"Germline variants in UNC13D and AP3B1 are enriched in COVID-19 patients experiencing severe cytokine storms.","date":"2021","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/33867526","citation_count":30,"is_preprint":false},{"pmid":"23557002","id":"PMC_23557002","title":"Disruption of AP3B1 by a chromosome 5 inversion: a new disease mechanism in Hermansky-Pudlak syndrome type 2.","date":"2013","source":"BMC medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23557002","citation_count":26,"is_preprint":false},{"pmid":"11056055","id":"PMC_11056055","title":"Genomic structure of the mouse Ap3b1 gene in normal and pearl mice.","date":"2000","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/11056055","citation_count":22,"is_preprint":false},{"pmid":"25980904","id":"PMC_25980904","title":"Synergistic defects of UNC13D and AP3B1 leading to adult hemophagocytic lymphohistiocytosis.","date":"2015","source":"International journal of hematology","url":"https://pubmed.ncbi.nlm.nih.gov/25980904","citation_count":17,"is_preprint":false},{"pmid":"15576359","id":"PMC_15576359","title":"Paradoxical homozygous expression from heterozygotes and heterozygous expression from homozygotes as a consequence of transcriptional infidelity through a polyadenine tract in the AP3B1 gene responsible for canine cyclic neutropenia.","date":"2004","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/15576359","citation_count":14,"is_preprint":false},{"pmid":"31820501","id":"PMC_31820501","title":"Novel AP3B1 compound heterozygous mutations in a Japanese patient with Hermansky-Pudlak syndrome type 2.","date":"2019","source":"The Journal of dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/31820501","citation_count":10,"is_preprint":false},{"pmid":"25160823","id":"PMC_25160823","title":"The Ap3b1 gene regulates the ocular melanosome biogenesis and tyrosinase distribution differently from the Hps1 gene.","date":"2014","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/25160823","citation_count":7,"is_preprint":false},{"pmid":"32016796","id":"PMC_32016796","title":"The Mutation of the Ap3b1 Gene Causes Uterine Hypoplasia in Pearl Mice.","date":"2020","source":"Reproductive sciences (Thousand Oaks, Calif.)","url":"https://pubmed.ncbi.nlm.nih.gov/32016796","citation_count":6,"is_preprint":false},{"pmid":"30786955","id":"PMC_30786955","title":"Different functions of biogenesis of lysosomal organelles complex 3 subunit 1 (Hps1) and adaptor-related protein complex 3, beta 1 subunit (Ap3b1) genes on spermatogenesis and male fertility.","date":"2019","source":"Reproduction, fertility, and development","url":"https://pubmed.ncbi.nlm.nih.gov/30786955","citation_count":6,"is_preprint":false},{"pmid":"34182253","id":"PMC_34182253","title":"Generation and characterization of a control and patient-derived human iPSC line containing the Hermansky Pudlak type 2 (HPS2) associated heterozygous compound mutation in AP3B1.","date":"2021","source":"Stem cell research","url":"https://pubmed.ncbi.nlm.nih.gov/34182253","citation_count":3,"is_preprint":false},{"pmid":"18000860","id":"PMC_18000860","title":"Sequence analysis of the SRGN, AP3B1, ARF6, and SH2D1A genes in familial hemophagocytic lymphohistiocytosis.","date":"2008","source":"Pediatric blood & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/18000860","citation_count":3,"is_preprint":false},{"pmid":"39128851","id":"PMC_39128851","title":"AP3B1 facilitates PDIA3/ERP57 function to regulate rabies virus glycoprotein selective degradation and viral entry.","date":"2024","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/39128851","citation_count":2,"is_preprint":false},{"pmid":"39339853","id":"PMC_39339853","title":"AP3B1 Has Type I Interferon-Independent Antiviral Function against SARS-CoV-2.","date":"2024","source":"Viruses","url":"https://pubmed.ncbi.nlm.nih.gov/39339853","citation_count":2,"is_preprint":false},{"pmid":"41300827","id":"PMC_41300827","title":"Canine Neuronal Ceroid Lipofuscinosis-like Disorder Associated with Sequence Variants in AP3B1 and TRAPPC9.","date":"2025","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/41300827","citation_count":1,"is_preprint":false},{"pmid":"41152257","id":"PMC_41152257","title":"Synergistic blood-based diagnostic value of AP3B1 and BMPR2 in Parkinson's disease.","date":"2025","source":"NPJ Parkinson's disease","url":"https://pubmed.ncbi.nlm.nih.gov/41152257","citation_count":0,"is_preprint":false},{"pmid":"36614895","id":"PMC_36614895","title":"Hemophagocytic Lymphohistiocytosis Associated with Synergistic Defects of AP3B1 and ATM Genes: A Case Report and Literature Review.","date":"2022","source":"Journal of clinical medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36614895","citation_count":0,"is_preprint":false},{"pmid":"32016797","id":"PMC_32016797","title":"Correction to: The Mutation of the Ap3b1 Gene Causes Uterine Hypoplasia in Pearl Mice.","date":"2020","source":"Reproductive sciences (Thousand Oaks, Calif.)","url":"https://pubmed.ncbi.nlm.nih.gov/32016797","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12369,"output_tokens":2973,"usd":0.040851,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10339,"output_tokens":3427,"usd":0.068685,"stage2_stop_reason":"end_turn"},"total_usd":0.109536,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"AP3B1 (beta3A subunit) is a core component of the AP-3 adaptor complex that regulates protein trafficking in the trans-Golgi network/endosomal compartments; mutations (large internal tandem duplication and deletion) in two pearl alleles abrogate beta3A function, causing defective biogenesis of lysosomes, melanosomes, and platelet-dense granules.\",\n      \"method\": \"Positional/candidate cloning, mutation identification in two alleles, expression analysis in kidney tissue\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — positional cloning with mutation identification replicated across two alleles, independently confirmed by multiple subsequent studies\",\n      \"pmids\": [\"9931340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Homologous-recombination knockout of Ap3b1 in mice confirms it is the causal gene for the pearl phenotype; loss of AP3B1 causes mislocalization of lysosomal membrane proteins LAMP-I and LAMP-II (clustered on cell surface) and melanosomal membrane protein tyrosinase in fibroblasts and melanocytes, consistent with an alternate plasma-membrane trafficking pathway for AP-3 cargo.\",\n      \"method\": \"Homologous recombination knockout, compound heterozygote rescue, immunofluorescence localization of LAMP-I, LAMP-II, and tyrosinase\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic null generated by homologous recombination with direct protein localization assay; complemented by compound heterozygote confirmation\",\n      \"pmids\": [\"11058094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Complete loss of AP3B1 (beta3A) protein due to nonsense mutations leads to co-depletion of the associated mu3 subunit of AP-3, and causes robust aberrant trafficking of LAMP-3 (a lysosomal membrane protein) to the plasma membrane instead of directly to the lysosome, demonstrating that AP3B1 is required for direct TGN-to-lysosome routing of integral lysosomal membrane proteins.\",\n      \"method\": \"Patient cell biology: immunoblotting for AP-3 subunits, immunofluorescence/cell-surface trafficking assay for LAMP-3 in fibroblasts from AP3B1-null patient\",\n      \"journal\": \"Pediatric research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional cell biology in human null patient cells, replicated across multiple labs\",\n      \"pmids\": [\"11809908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A homozygous genomic deletion causing in-frame skipping of exon 15 in AP3B1 perturbs AP-3 heterotetrameric complex assembly and causes aberrant trafficking of the transmembrane lysosomal protein CD63; in basal keratinocytes, incorporated immature melanosomes are rapidly degraded in large phagolysosomes.\",\n      \"method\": \"Genetic linkage analysis, targeted gene sequencing, immunofluorescence for CD63 trafficking, electron microscopy of keratinocytes\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient genetics with direct functional cell biology (CD63 trafficking assay, EM), single lab but two orthogonal methods\",\n      \"pmids\": [\"16537806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"AP3B1 (beta3A subunit of AP-3) is a substrate for IP7-mediated pyrophosphorylation on a prephosphorylated serine residue; Kif3A (a kinesin-superfamily motor protein) is identified as an AP3B1-binding partner, and IP7-mediated pyrophosphorylation of AP3B1 modulates its interaction with Kif3A, which in turn affects HIV-1 Gag release.\",\n      \"method\": \"IP7-mediated pyrophosphorylation assay in vitro, co-immunoprecipitation of AP3B1 and Kif3A, HIV-1 virus-like particle release assay with AP-3 complex perturbation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical pyrophosphorylation assay plus Co-IP for binding partner, single lab, two orthogonal methods\",\n      \"pmids\": [\"19934039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Loss-of-function mutations in AP3B1 cause defective cytotoxic T-lymphocyte (CTL) granule secretion (increased cell-surface CD63, reduced cytotoxicity) and platelet dense granule defects (impaired aggregation, reduced 3H-serotonin uptake), establishing AP3B1/AP-3 as required for biogenesis and/or function of secretory lysosomes in CTLs and platelet dense granules.\",\n      \"method\": \"Patient-derived CTL clones: CD63 surface expression assay, cytotoxicity assay; platelet aggregation and 3H-serotonin uptake assay\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays in patient-derived cells, two orthogonal readouts, single lab\",\n      \"pmids\": [\"19679886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A frameshift insertion in a homopolymeric adenine tract in exon 21 of the canine AP3B1 gene is the causative mutation in canine cyclic neutropenia; transcriptional slippage at this polyA tract generates both mutant and wild-type transcripts from homozygous mutant alleles, a consequence of transcriptional infidelity through homopolymeric sequences.\",\n      \"method\": \"RT-PCR subclone analysis of heterozygous and homozygous dogs, in vitro reporter assay for transcriptional slippage\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reporter assay plus RT-PCR analysis, single lab, two orthogonal methods confirming mechanistic basis\",\n      \"pmids\": [\"15576359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In pearl (Ap3b1 mutant) eyes, hypopigmentation is more severe than in pale ear (Hps1 mutant) mice, total tyrosinase activity is higher (suggesting weaker degradation of aberrantly transported tyrosinase), and double heterozygous Hps1/Ap3b1 mice show iris hypopigmentation more severe than either single mutant, indicating that AP3B1 and HPS1 operate in distinct but synergistic pathways for ocular melanosome biogenesis and tyrosinase distribution.\",\n      \"method\": \"Comparative pigmentation analysis in single and double mutant mice, tyrosinase activity assay, histology\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with double-mutant analysis plus enzymatic activity assay, single lab\",\n      \"pmids\": [\"25160823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AP3B1 mutation in pearl mice causes delayed testis development, reduced sperm count, and lower testosterone concentrations during spermatogenesis, and pe males show reduced lysosomes in Sertoli cells, establishing a role for AP3B1/AP-3 in male reproductive development distinct from HPS1.\",\n      \"method\": \"Comparative analysis of pe and ep mutant mice: sperm count, testosterone measurement, electron microscopy of sperm tails, litter size analysis\",\n      \"journal\": \"Reproduction, fertility, and development\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — phenotypic characterization in mutant mice with EM and hormonal assays, single lab, no direct molecular mechanism shown\",\n      \"pmids\": [\"30786955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AP3B1 interacts with PDIA3/ERP57 and is indispensable for PDIA3-triggered selective autophagy-mediated degradation of rabies virus G protein, thereby restricting RABV infection; AP3B1 was identified by affinity tag-purification mass spectrometry as a PDIA3 interactor and its requirement was confirmed by knockout experiments.\",\n      \"method\": \"Affinity tag-purification mass spectrometry, co-immunoprecipitation, AP3B1 knockout cell functional assay for RABV G protein degradation\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — AP-MS identification plus Co-IP plus KO functional assay, single lab, two orthogonal methods\",\n      \"pmids\": [\"39128851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AP3B1 physically interacts with the SARS-CoV-2 envelope (E) protein in infected cells and acts as an antiviral factor: overexpression of AP3B1 suppresses SARS-CoV-2 replication, while siRNA-mediated depletion increases release of infectious virus, demonstrating an intrinsic antiviral barrier function of AP3B1.\",\n      \"method\": \"Immunoprecipitation and immunofluorescence in virus-infected cells, AP3B1 overexpression and siRNA knockdown with viral replication quantification\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — confirmed interaction by IP and IFA, gain- and loss-of-function with viral output readout, single lab, two orthogonal methods\",\n      \"pmids\": [\"39339853\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AP3B1 encodes the β3A subunit of the heterotetrameric AP-3 adaptor complex, which functions as a coat protein mediating vesicle formation from the trans-Golgi network/endosomes to direct transmembrane cargo (including LAMP-1, LAMP-2, LAMP-3, CD63, and tyrosinase) to lysosomes and lysosome-related organelles (melanosomes, platelet dense granules, CTL secretory lysosomes); loss of AP3B1 destabilizes other AP-3 subunits (e.g., mu3), misdirects lysosomal membrane proteins to the plasma membrane, and impairs biogenesis of multiple lysosome-related organelles, while AP3B1 is also subject to IP7-mediated pyrophosphorylation that modulates its interaction with the kinesin motor Kif3A to regulate intracellular trafficking, and participates in antiviral defense by interacting with viral proteins (SARS-CoV-2 E protein, RABV G protein degradation via PDIA3-mediated selective autophagy).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AP3B1 encodes the β3A subunit of the heterotetrameric AP-3 adaptor complex, which mediates the direct sorting of integral membrane cargo from the trans-Golgi network/endosomal system to lysosomes and lysosome-related organelles [#0, #2]. Loss of AP3B1 destabilizes the complex—co-depleting the associated μ3 subunit [#2]—and reroutes lysosomal membrane proteins including LAMP-1, LAMP-2, LAMP-3, CD63, and the melanosomal protein tyrosinase to the plasma membrane, demonstrating that AP3B1 enforces a direct intracellular routing pathway distinct from a default surface route [#1, #2, #3]. Through this trafficking function AP3B1 is required for the biogenesis and function of multiple lysosome-related organelles: defects cause hypopigmented melanosomes, impaired platelet dense granules, and defective cytotoxic T-lymphocyte secretory lysosomes, the cellular basis of the pearl phenotype and Hermansky-Pudlak-type disease [#0, #5]. Genetic studies place AP3B1 in a pathway distinct from but synergistic with HPS1 for ocular melanosome biogenesis [#7]. AP3B1 is a substrate for IP7-mediated pyrophosphorylation on a prephosphorylated serine, and this modification modulates its interaction with the kinesin motor Kif3A [#4]. Beyond canonical trafficking, AP3B1 functions in antiviral defense, physically interacting with the SARS-CoV-2 envelope protein to restrict viral replication [#10] and acting with PDIA3/ERP57 in selective autophagy-mediated degradation of the rabies virus G protein [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established AP3B1 as a core AP-3 adaptor subunit whose loss disrupts biogenesis of lysosomes, melanosomes, and platelet-dense granules, defining its identity as a trafficking gene.\",\n      \"evidence\": \"Positional/candidate cloning and mutation identification in two pearl alleles, with expression analysis\",\n      \"pmids\": [\"9931340\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the molecular sorting step (direct vs. alternate routing)\", \"No cargo-level trafficking assay\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Confirmed AP3B1 as the causal pearl gene and showed loss mislocalizes LAMP-I, LAMP-II, and tyrosinase to the cell surface, revealing an alternate plasma-membrane route for AP-3 cargo.\",\n      \"evidence\": \"Homologous-recombination knockout mice with compound heterozygote rescue and immunofluorescence cargo localization\",\n      \"pmids\": [\"11058094\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address effects on other AP-3 subunits\", \"Mechanism of the alternate route not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated in human null patient cells that loss of β3A co-depletes the μ3 subunit and aberrantly routes LAMP-3 to the plasma membrane, establishing AP3B1 as required for direct TGN-to-lysosome cargo delivery.\",\n      \"evidence\": \"Patient fibroblast immunoblotting for AP-3 subunits and cell-surface trafficking assay for LAMP-3\",\n      \"pmids\": [\"11809908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map the cargo-recognition determinants\", \"Structural basis of complex destabilization not shown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed that an in-frame exon-skipping deletion perturbs AP-3 heterotetramer assembly and misroutes CD63, linking complex integrity to cargo sorting and to rapid degradation of immature melanosomes in keratinocytes.\",\n      \"evidence\": \"Patient genetics with CD63 immunofluorescence trafficking assay and electron microscopy\",\n      \"pmids\": [\"16537806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-lab functional data\", \"Fate of misrouted CD63 not fully tracked\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified a post-translational regulatory layer: AP3B1 is pyrophosphorylated by IP7 on a prephosphorylated serine, and this modulates binding to the kinesin Kif3A, coupling AP-3 to motor-driven trafficking.\",\n      \"evidence\": \"In vitro IP7 pyrophosphorylation assay, AP3B1-Kif3A co-immunoprecipitation, and HIV-1 VLP release assay\",\n      \"pmids\": [\"19934039\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; in vitro pyrophosphorylation\", \"Functional consequence of Kif3A binding in vivo not fully resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended the lysosome-related organelle role to immune and hemostatic cells, showing AP3B1 loss impairs CTL secretory-lysosome function and platelet dense granule activity.\",\n      \"evidence\": \"Patient-derived CTL clones (CD63 surface, cytotoxicity) and platelet aggregation/serotonin uptake assays\",\n      \"pmids\": [\"19679886\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Biogenesis vs. secretion defect not disentangled\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Characterized a canine AP3B1 frameshift in a homopolymeric tract as the cause of cyclic neutropenia, with transcriptional slippage producing mixed transcripts, illustrating mutational mechanism in this gene.\",\n      \"evidence\": \"RT-PCR subclone analysis and in vitro reporter assay for transcriptional slippage\",\n      \"pmids\": [\"15576359\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link to neutrophil cycling not established\", \"Model-organism mutation, not human cargo biology\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Genetic epistasis placed AP3B1 and HPS1 in distinct but synergistic pathways for ocular melanosome biogenesis and tyrosinase distribution.\",\n      \"evidence\": \"Single and double mutant mouse pigmentation analysis, tyrosinase activity assay, histology\",\n      \"pmids\": [\"25160823\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of pathway divergence not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Implicated AP3B1 in male reproductive development, with pearl mice showing delayed testis development and reduced Sertoli-cell lysosomes.\",\n      \"evidence\": \"Phenotypic characterization of mutant mice (sperm count, testosterone, EM)\",\n      \"pmids\": [\"30786955\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct molecular mechanism shown\", \"Single lab phenotypic study\", \"Lysosome defect causal link not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed an antiviral role: AP3B1 interacts with the SARS-CoV-2 E protein and restricts replication, and acts with PDIA3 to drive selective autophagy of the rabies virus G protein.\",\n      \"evidence\": \"IP/IFA in infected cells with gain/loss-of-function viral output; AP-MS, Co-IP, and KO functional assay for RABV G degradation\",\n      \"pmids\": [\"39339853\", \"39128851\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between trafficking function and viral restriction not defined\", \"Single lab per virus\", \"Whether AP-3 complex integrity is required not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AP-3 cargo-recognition specificity, IP7/Kif3A regulation, and the newly described antiviral functions integrate at the structural and pathway level remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the AP-3 cargo-binding interface in the timeline\", \"Mechanism connecting trafficking to viral restriction unknown\", \"In vivo role of pyrophosphorylation undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [1, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [\"AP-3 adaptor complex\"],\n    \"partners\": [\"AP3M1\", \"KIF3A\", \"PDIA3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}