{"gene":"USP32","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2010,"finding":"USP32 encodes an active deubiquitinating enzyme with conserved catalytic USP-domain residues (asparagine, cysteine, histidine, aspartic acid) and localizes to the Golgi apparatus, as demonstrated by GFP-fusion fluorescence protection assay and BODIPY-TR staining. Stable silencing of USP32 significantly decreases cell proliferation and migration rates.","method":"GFP-fusion fluorescence protection assay, BODIPY-TR Golgi staining, stable shRNA knockdown with proliferation and migration assays","journal":"Mammalian Genome","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct localization experiment with functional consequence (migration/proliferation phenotype), single lab with orthogonal methods","pmids":["20549504"],"is_preprint":false},{"year":2003,"finding":"USP32 (also known as NY-REN-60) is an ancient, highly conserved deubiquitinase gene that served as the ancestral template for the hominoid-specific oncogene Tre2 (USP6), which arose through chimeric fusion of USP32 with TBC1D3. USP32 is broadly expressed across tissues, in contrast to the testis-specific Tre2.","method":"Phylogenetic analysis, genomic sequencing, expression profiling","journal":"Proceedings of the National Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 3 — genomic/evolutionary characterization with expression data; establishes identity and conservation of USP32","pmids":["12604796"],"is_preprint":false},{"year":2009,"finding":"Global proteomic analysis of deubiquitinase interaction networks identified USP32 as a DUB with candidate interacting proteins, placing it within the broader DUB interaction landscape.","method":"Affinity purification–mass spectrometry (AP-MS) with CompPASS bioinformatics","journal":"Cell","confidence":"Low","confidence_rationale":"Tier 3 — large-scale AP-MS; USP32-specific interactions not individually validated in this study","pmids":["19615732"],"is_preprint":false},{"year":2017,"finding":"Silencing of USP32 in small cell lung cancer (SCLC) cells inhibits proliferation and migration, arrests the cell cycle at G0/G1 phase by decreasing CDK4/Cyclin D1 complex and elevating p21, induces apoptosis via activation of cleaved caspase-3 and cleaved PARP, and reduces cell invasiveness by altering EMT marker expression.","method":"siRNA knockdown, cell viability assay, cell cycle analysis by flow cytometry, Western blotting for CDK4/Cyclin D1/p21/caspase-3/PARP, invasion assay","journal":"Cell Proliferation","confidence":"Medium","confidence_rationale":"Tier 2–3 — clean KD with multiple defined cellular phenotypes and molecular markers; single lab","pmids":["28597490"],"is_preprint":false},{"year":2019,"finding":"USP32 deubiquitylates Rab7, the small GTPase central to late endosome (LE) biology. Loss of USP32 inhibits late endosome transport and recycling of LE cargos, resulting in dispersion and swelling of the late endosomal compartment. SILAC-based ubiquitome profiling identified Rab7 as a USP32 substrate. The LE transport effector RILP preferentially binds ubiquitylation-deficient Rab7, while retromer-mediated LE recycling requires an intact cycle of Rab7 ubiquitylation, suggesting USP32-dependent reversible ubiquitylation switches Rab7 between its transport and recycling functions.","method":"SILAC-based ubiquitome profiling, USP32 knockout/knockdown, live-cell imaging, cargo recycling assays, Co-IP with RILP and retromer","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1–2 — SILAC ubiquitome identifies substrate, KO phenotype with multiple orthogonal readouts, mechanistic dissection of RILP vs. retromer preference; single lab but strong methodology","pmids":["30926795"],"is_preprint":false},{"year":2020,"finding":"USP32 knockdown or depletion significantly inhibits gastric cancer (GC) cell proliferation and migration in vitro and in vivo. Mechanistically, USP32 silencing causes decreased expression of SMAD2, and re-introduction of SMAD2 rescues the inhibitory effects, indicating USP32 promotes GC progression through stabilization of SMAD2.","method":"siRNA/shRNA knockdown, in vivo xenograft, immunohistochemistry, Western blotting, SMAD2 rescue experiments","journal":"International Journal of Biological Sciences","confidence":"Medium","confidence_rationale":"Tier 2–3 — KD with in vivo validation and rescue experiment identifying SMAD2 as downstream effector; single lab","pmids":["32226309"],"is_preprint":false},{"year":2021,"finding":"CRISPR-based dual screening identified USP32 as a deubiquitinase that destabilizes SLC35F2 (a solute-carrier protein essential for uptake of the anticancer compound YM155), thereby conferring YM155 resistance. USP32 and SLC35F2 expression are negatively correlated; targeted USP32 knockout verified it as the main determinant of SLC35F2 protein stability in vitro and in vivo. USP32 promotes ER-associated degradation of SLC35F2.","method":"Genome-scale CRISPR-Cas9 knockout screen, Western blotting, in vivo xenograft, co-immunoprecipitation, ubiquitination assays","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1–2 — unbiased genome-scale screen followed by mechanistic validation with KO, in vivo confirmation, and substrate identification; multiple orthogonal methods","pmids":["34815782"],"is_preprint":false},{"year":2022,"finding":"USP32 knockout in hTERT-RPE1 cells results in hyperubiquitination of LAMTOR1, a Ragulator complex subunit. Accumulation of LAMTOR1 ubiquitination impairs its interaction with the vacuolar H+-ATPase, reduces Ragulator function, limits mTORC1 recruitment to lysosomes, decreases mTORC1 activity, and induces autophagy. Depletion of the USP32 homolog CYK-3 in C. elegans similarly results in mTOR inhibition and autophagy induction.","method":"USP32 knockout (CRISPR), ubiquitome proteomics, mTOR localization by immunofluorescence, mTORC1 activity assays (S6K/4E-BP1 phosphorylation), v-ATPase interaction Co-IP, C. elegans CYK-3 depletion","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 1–2 — KO with ubiquitome profiling identifies substrate, multiple orthogonal functional readouts, cross-species validation in C. elegans","pmids":["36476874"],"is_preprint":false},{"year":2023,"finding":"USP32 deubiquitylates Rab35 by removing K48-linked ubiquitin chains, protecting it from proteasomal degradation. Elevated Rab35 in imatinib-resistant GISTs increases exosome secretion that transmits drug resistance to sensitive tumors. The transcription factor ETV1 promotes USP32 expression in GISTs.","method":"Co-immunoprecipitation, ubiquitination assays (K48-linkage specific), Rab35 knockdown/overexpression, exosome secretion quantification, iTRAQ proteomics, ETV1 ChIP/reporter assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 — substrate identification with linkage-specific ubiquitination assay, mechanistic epistasis (USP32→Rab35→exosome secretion→resistance), upstream regulator identified","pmids":["36725886"],"is_preprint":false},{"year":2019,"finding":"miR-let-7a directly targets the 3'-UTR of USP32 mRNA to suppress its protein expression, and overexpression of USP32 reverses let-7a-mediated inhibition of MCF-7 breast cancer cell proliferation, placing USP32 downstream of let-7a in a proliferation-regulatory axis.","method":"miRNA mimic/inhibitor transfection, dual-luciferase reporter assay (3'-UTR), Western blotting, MTT proliferation assay, colony formation","journal":"Translational Cancer Research","confidence":"Medium","confidence_rationale":"Tier 3 — direct 3'-UTR targeting validated by luciferase assay, rescue experiment confirms USP32 as functional downstream target; single lab","pmids":["35116927"],"is_preprint":false},{"year":2024,"finding":"USP32 interacts with BAG3 and deubiquitinates and stabilizes BAG3 protein in a deubiquitinating activity-dependent manner in non-small cell lung cancer (NSCLC) cells. USP32-mediated BAG3 stabilization increases phosphorylation of the RAF/MEK/ERK signaling pathway. Restoration of BAG3 abrogates antitumor effects of USP32 silencing, establishing USP32→BAG3→RAF/MEK/ERK as an oncogenic axis in NSCLC.","method":"AP-MS to identify interacting proteins, Co-IP, ubiquitination assays, shRNA knockdown, BAG3 rescue experiments, Western blotting for RAF/MEK/ERK phosphorylation, in vivo xenograft","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2–3 — substrate identified by AP-MS and validated by Co-IP and ubiquitination assay, pathway placement via rescue; single lab","pmids":["39030175"],"is_preprint":false}],"current_model":"USP32 is an active, Golgi-localized deubiquitinase that regulates endosomal trafficking by deubiquitylating the small GTPases Rab7 (controlling late endosome transport/recycling) and Rab35 (controlling exosome secretion), controls lysosomal mTORC1 signaling by removing non-proteolytic ubiquitin from LAMTOR1, promotes cancer cell survival and proliferation through substrates including SLC35F2 (ER-associated degradation), BAG3 (activating RAF-MEK-ERK), and SMAD2, and is itself regulated at the mRNA level by miR-let-7a."},"narrative":{"teleology":[{"year":2003,"claim":"Establishing the evolutionary identity of USP32 as an ancient, broadly expressed DUB that served as the ancestral template for the hominoid-specific oncogene USP6 (Tre2) resolved the gene's origin and indicated functional conservation across vertebrates.","evidence":"Phylogenetic and genomic analysis of USP32/TBC1D3/USP6 loci with expression profiling","pmids":["12604796"],"confidence":"Medium","gaps":["No biochemical DUB activity demonstrated at this point","Endogenous substrates unknown"]},{"year":2010,"claim":"Demonstrating that USP32 possesses conserved catalytic residues, localizes to the Golgi apparatus, and is required for normal cell proliferation and migration established its enzymatic competence and subcellular context.","evidence":"GFP-fusion fluorescence protection assay with BODIPY-TR Golgi costaining, shRNA knockdown with proliferation/migration assays","pmids":["20549504"],"confidence":"Medium","gaps":["In vitro DUB activity not directly measured","No substrates identified","Golgi localization not confirmed by endogenous staining"]},{"year":2017,"claim":"Showing that USP32 silencing arrests cells in G0/G1 (via CDK4/Cyclin D1 loss and p21 induction), activates apoptosis, and suppresses EMT markers in SCLC cells expanded the proliferative phenotype to a defined cell-cycle and apoptotic mechanism.","evidence":"siRNA knockdown with flow cytometry, Western blotting for cell-cycle regulators and EMT markers, invasion assays in SCLC lines","pmids":["28597490"],"confidence":"Medium","gaps":["Direct DUB substrates mediating cell-cycle effects unidentified","Single cancer type examined"]},{"year":2019,"claim":"Identification of Rab7 as a direct USP32 substrate via SILAC ubiquitome profiling, and demonstration that USP32-dependent deubiquitylation toggles Rab7 between RILP-mediated transport and retromer-mediated recycling, provided the first mechanistic link between USP32 and endosomal trafficking.","evidence":"SILAC ubiquitome profiling in USP32-KO hTERT-RPE1 cells, live-cell imaging, cargo recycling assays, co-IP with RILP and retromer subunits","pmids":["30926795"],"confidence":"High","gaps":["Ubiquitin chain type on Rab7 not fully defined","Upstream signals regulating USP32-Rab7 axis unknown","Impact on in vivo endosomal trafficking not tested"]},{"year":2019,"claim":"Validation that miR-let-7a directly targets the USP32 3′-UTR to suppress its expression, with USP32 re-expression rescuing proliferation, established a post-transcriptional regulatory input controlling USP32 abundance.","evidence":"Dual-luciferase 3′-UTR reporter assay, miRNA mimic/inhibitor transfection, rescue experiments in MCF-7 cells","pmids":["35116927"],"confidence":"Medium","gaps":["Physiological contexts where let-7a–USP32 axis operates are uncharacterized","Other miRNAs regulating USP32 not surveyed"]},{"year":2020,"claim":"Demonstration that USP32 stabilizes SMAD2 in gastric cancer, with SMAD2 re-expression rescuing proliferation/migration upon USP32 loss, expanded the substrate repertoire to TGF-β signaling components.","evidence":"shRNA knockdown with SMAD2 rescue, in vivo xenograft, IHC","pmids":["32226309"],"confidence":"Medium","gaps":["Direct deubiquitylation of SMAD2 not shown with in vitro DUB assay","Ubiquitin chain type on SMAD2 undetermined"]},{"year":2021,"claim":"An unbiased CRISPR screen identified USP32 as the principal determinant of SLC35F2 protein stability, revealing that USP32 paradoxically promotes ER-associated degradation of SLC35F2 to confer drug resistance, uncovering a non-canonical substrate relationship.","evidence":"Genome-scale CRISPR KO screen, USP32 KO validation, co-IP, ubiquitination assays, in vivo xenograft","pmids":["34815782"],"confidence":"High","gaps":["Mechanism by which a DUB promotes ERAD of SLC35F2 is not fully resolved","Whether USP32 acts on an intermediate rather than SLC35F2 directly is unclear"]},{"year":2022,"claim":"Discovery that USP32 deubiquitylates LAMTOR1 to maintain Ragulator–v-ATPase interaction and mTORC1 lysosomal recruitment, confirmed cross-species by CYK-3 depletion in C. elegans, established USP32 as a gatekeeper of nutrient-sensing signaling.","evidence":"USP32 CRISPR-KO, ubiquitome proteomics, mTORC1 activity assays (S6K/4E-BP1 phosphorylation), v-ATPase co-IP, C. elegans CYK-3 depletion","pmids":["36476874"],"confidence":"High","gaps":["Ubiquitin chain type on LAMTOR1 not specified","Whether USP32 acts at lysosomes or Golgi for LAMTOR1 deubiquitylation is unresolved"]},{"year":2023,"claim":"Identification of Rab35 as a USP32 substrate (K48-linked ubiquitin removal) that links USP32 to exosome-mediated transmission of imatinib resistance in GISTs extended the DUB's trafficking role to the exosome biogenesis pathway and revealed ETV1 as a transcriptional activator of USP32.","evidence":"K48-linkage-specific ubiquitination assays, Rab35 KD/OE, exosome quantification, ETV1 ChIP and reporter assays in GIST cells","pmids":["36725886"],"confidence":"High","gaps":["Whether USP32–Rab35 axis operates outside the GIST context is untested","Other chain types on Rab35 not examined"]},{"year":2024,"claim":"Identification of BAG3 as a direct USP32 substrate that activates RAF–MEK–ERK signaling in NSCLC established a new oncogenic axis and demonstrated substrate-level epistasis through BAG3 rescue experiments.","evidence":"AP-MS, co-IP, ubiquitination assays, shRNA KD with BAG3 rescue, RAF/MEK/ERK phosphorylation Western blots, in vivo xenograft","pmids":["39030175"],"confidence":"Medium","gaps":["Ubiquitin chain type on BAG3 not determined","Whether BAG3 stabilization connects to the mTORC1/autophagy axis is unknown"]},{"year":null,"claim":"A unified structural and regulatory model explaining how USP32 selects among its diverse substrates (Rab7, Rab35, LAMTOR1, BAG3, SMAD2, SLC35F2), whether substrate access is determined by Golgi/endosome localization or by adaptor proteins, and how USP32's own catalytic activity is regulated post-translationally, remains to be established.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal structure or cryo-EM structure available","No post-translational regulatory mechanism for USP32 activity defined","Substrate selectivity determinants unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,4,6,7,8,10]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,4,7,8,10]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[4]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[4,8]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,10]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[7]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,6,7,8,10]}],"complexes":[],"partners":["RAB7A","RAB35","LAMTOR1","BAG3","SMAD2","SLC35F2"],"other_free_text":[]},"mechanistic_narrative":"USP32 is a broadly expressed, Golgi-localized deubiquitinating enzyme that controls endosomal and lysosomal trafficking by reversibly removing ubiquitin from small GTPases and lysosomal signaling components. It deubiquitylates Rab7 to regulate the balance between late-endosome transport and retromer-mediated recycling [PMID:30926795], deubiquitylates Rab35 (K48-linked chains) to promote exosome secretion [PMID:36725886], and removes non-proteolytic ubiquitin from the Ragulator subunit LAMTOR1 to sustain vacuolar H⁺-ATPase interaction and mTORC1 recruitment at lysosomes [PMID:36476874]. USP32 also stabilizes oncogenic substrates including SLC35F2 (via ER-associated degradation) [PMID:34815782], BAG3 (activating the RAF–MEK–ERK cascade) [PMID:39030175], and SMAD2 [PMID:32226309], linking its deubiquitinase activity to cancer cell proliferation, migration, and drug resistance across multiple tumor types."},"prefetch_data":{"uniprot":{"accession":"Q8NFA0","full_name":"Ubiquitin carboxyl-terminal hydrolase 32","aliases":["Deubiquitinating enzyme 32","Renal carcinoma antigen NY-REN-60","Ubiquitin thioesterase 32","Ubiquitin-specific-processing protease 32"],"length_aa":1604,"mass_kda":181.7,"function":"Deubiquitinase that can remove conjugated ubiquitin from target proteins, such as RAB7A and LAMTOR1 (PubMed:36476874). Acts as a positive regulator of the mTORC1 signaling by mediating deubiquitination of LAMTOR1, thereby promoting the association between LAMTOR1 and the lysosomal V-ATPase complex and subsequent activation of the mTORC1 complex (PubMed:36476874)","subcellular_location":"Golgi apparatus membrane","url":"https://www.uniprot.org/uniprotkb/Q8NFA0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/USP32","classification":"Not Classified","n_dependent_lines":102,"n_total_lines":1208,"dependency_fraction":0.08443708609271523},"opencell":{"profiled":true,"resolved_as":"USP10","ensg_id":"ENSG00000103194","cell_line_id":"CID001518","localizations":[{"compartment":"cytoplasmic","grade":3}],"interactors":[{"gene":"G3BP2","stoichiometry":4.0},{"gene":"RBM42","stoichiometry":4.0},{"gene":"ATG4B","stoichiometry":0.2},{"gene":"CAPRIN1","stoichiometry":0.2},{"gene":"DRG1","stoichiometry":0.2},{"gene":"EIF3G","stoichiometry":0.2},{"gene":"G3BP1","stoichiometry":0.2},{"gene":"GSPT1","stoichiometry":0.2},{"gene":"LMNB1","stoichiometry":0.2},{"gene":"MAPRE1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001518","total_profiled":1310},"omim":[{"mim_id":"607741","title":"TBC1 DOMAIN FAMILY, MEMBER 3; TBC1D3","url":"https://www.omim.org/entry/607741"},{"mim_id":"607740","title":"UBIQUITIN-SPECIFIC PROTEASE 32; USP32","url":"https://www.omim.org/entry/607740"},{"mim_id":"604334","title":"UBIQUITIN-SPECIFIC PROTEASE 6; USP6","url":"https://www.omim.org/entry/604334"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":95.4}],"url":"https://www.proteinatlas.org/search/USP32"},"hgnc":{"alias_symbol":["NY-REN-60","USP10"],"prev_symbol":[]},"alphafold":{"accession":"Q8NFA0","domains":[{"cath_id":"1.10.238.10","chopping":"14-166","consensus_level":"medium","plddt":89.0008,"start":14,"end":166},{"cath_id":"1.10.238.10","chopping":"182-368","consensus_level":"high","plddt":89.2896,"start":182,"end":368},{"cath_id":"3.30.2230.10","chopping":"372-416_523-598","consensus_level":"medium","plddt":87.3557,"start":372,"end":598},{"cath_id":"3.10.20.90","chopping":"600-610_631-703","consensus_level":"medium","plddt":89.3033,"start":600,"end":703},{"cath_id":"-","chopping":"1076-1133_1148-1216","consensus_level":"high","plddt":86.7294,"start":1076,"end":1216}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NFA0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NFA0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NFA0-F1-predicted_aligned_error_v6.png","plddt_mean":72.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=USP32","jax_strain_url":"https://www.jax.org/strain/search?query=USP32"},"sequence":{"accession":"Q8NFA0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NFA0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NFA0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NFA0"}},"corpus_meta":[{"pmid":"21962518","id":"PMC_21962518","title":"Beclin1 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Stability.","date":"2018","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/29576527","citation_count":150,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"29117863","id":"PMC_29117863","title":"RNA-binding activity of TRIM25 is mediated by its PRY/SPRY domain and is required for ubiquitination.","date":"2017","source":"BMC biology","url":"https://pubmed.ncbi.nlm.nih.gov/29117863","citation_count":135,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"30639242","id":"PMC_30639242","title":"The Functional Proximal Proteome of Oncogenic Ras Includes mTORC2.","date":"2019","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/30639242","citation_count":124,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12604796","id":"PMC_12604796","title":"The Tre2 (USP6) oncogene is a hominoid-specific gene.","date":"2003","source":"Proceedings of the National Academy of Sciences of the United States of 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communications","url":"https://pubmed.ncbi.nlm.nih.gov/35013218","citation_count":99,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32814053","id":"PMC_32814053","title":"Interactome Mapping Provides a Network of Neurodegenerative Disease Proteins and Uncovers Widespread Protein Aggregation in Affected Brains.","date":"2020","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/32814053","citation_count":79,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24705354","id":"PMC_24705354","title":"The palmitoyl acyltransferase HIP14 shares a high proportion of interactors with huntingtin: implications for a role in the pathogenesis of Huntington's disease.","date":"2014","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24705354","citation_count":58,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35384245","id":"PMC_35384245","title":"Physical and functional interactome atlas of human receptor tyrosine 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ubiquitin ligase and CRAF/RAF1 kinase, by the deubiquitylating enzyme USP15.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23105109","citation_count":42,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34369648","id":"PMC_34369648","title":"BioID reveals an ATG9A interaction with ATG13-ATG101 in the degradation of p62/SQSTM1-ubiquitin clusters.","date":"2021","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/34369648","citation_count":42,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26514267","id":"PMC_26514267","title":"Protein interactome mining defines melatonin MT1 receptors as integral component of presynaptic protein complexes of neurons.","date":"2015","source":"Journal of pineal research","url":"https://pubmed.ncbi.nlm.nih.gov/26514267","citation_count":39,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51018,"output_tokens":2376,"usd":0.094347},"stage2":{"model":"claude-opus-4-6","input_tokens":5675,"output_tokens":2492,"usd":0.136013},"total_usd":0.511093,"stage1_batch_id":"msgbatch_01BparvgRZ9S2LMidvaoo86K","stage2_batch_id":"msgbatch_01NkBfv9SVZWthhS7j6mU6G3","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":63805,"output_tokens":3831,"usd":0.12444},"round2_rules_fired":"R2","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6649,"output_tokens":2838,"usd":0.156293}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2019,\n      \"finding\": \"USP32 is a deubiquitylating enzyme that deubiquitylates the small GTPase Rab7, identified by SILAC-based ubiquitome profiling. Loss of USP32 inhibits late endosome (LE) transport and recycling of LE cargos, causing dispersion and swelling of the late compartment. Mechanistic studies show that the LE transport effector RILP prefers ubiquitylation-deficient Rab7, while retromer-mediated LE recycling benefits from an intact cycle of Rab7 ubiquitylation, indicating that reversible ubiquitylation of Rab7 switches it between its various functions.\",\n      \"method\": \"SILAC-based ubiquitome profiling, co-immunoprecipitation, loss-of-function (USP32 knockout/knockdown), live-cell imaging, electron microscopy, functional cargo trafficking assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — SILAC ubiquitome screen identifying substrate, genetic KO with defined trafficking phenotype, multiple orthogonal methods in single paper\",\n      \"pmids\": [\"30926795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"USP32 is an active deubiquitinating enzyme with conserved USP catalytic domain (Asn, Cys, His, Asp residues). GFP-fused USP32 localizes to the Golgi apparatus as determined by fluorescence protection assay and BODIPY-TR co-staining. Stable silencing of USP32 causes a significant decrease in cell proliferation and migration.\",\n      \"method\": \"Fluorescence protection assay, BODIPY-TR Golgi staining, stable shRNA knockdown, proliferation and migration assays, conservation domain analysis\",\n      \"journal\": \"Mammalian genome : official journal of the International Mammalian Genome Society\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence (proliferation/migration), single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20549504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP32 promotes tumorigenesis and chemoresistance in gastric cancer via upregulation of SMAD2 protein levels. Knockdown of USP32 causes a decrease in SMAD2 expression, inhibiting GC cell growth, motility, and resistance to cisplatin.\",\n      \"method\": \"siRNA/shRNA knockdown, Western blotting, in vitro and in vivo tumor growth assays, co-immunoprecipitation\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — KD with defined cellular phenotype and pathway placement (USP32→SMAD2), single lab\",\n      \"pmids\": [\"32226309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Downregulation of USP32 in small cell lung cancer (SCLC) cells inhibits proliferation and migration, arrests cell cycle at G0/G1 phase via decreasing CDK4/Cyclin D1 complex and elevating p21, induces apoptosis via caspase-3/PARP activation, and inhibits invasion by altering EMT marker expression.\",\n      \"method\": \"siRNA knockdown, flow cytometry (cell cycle and apoptosis), Western blotting, invasion assay\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with multiple defined cellular phenotypes, single lab\",\n      \"pmids\": [\"28597490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP32 confers cancer cell resistance to YM155 by promoting ER-associated degradation of solute carrier protein SLC35F2. USP32 destabilizes SLC35F2, reducing uptake of YM155. Expression of USP32 and SLC35F2 is negatively correlated across cancer cell lines, and targeted genome knockout confirmed USP32 as the main determinant of SLC35F2 protein stability in vitro and in vivo.\",\n      \"method\": \"CRISPR-Cas9 genome-scale knockout screen, dual-screening, Western blotting, in vitro and in vivo functional assays\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genome-scale CRISPR screen with validation, genetic KO, in vivo confirmation, identification of substrate (SLC35F2)\",\n      \"pmids\": [\"34815782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP32 deubiquitylates LAMTOR1, a Ragulator complex subunit. Knockout of USP32 results in hyperubiquitination of LAMTOR1, which impairs its interaction with the vacuolar H+-ATPase, reduces Ragulator function, limits mTORC1 recruitment to lysosomes, decreases mTORC1 activity, and induces autophagy. Depletion of USP32 homolog CYK-3 in C. elegans similarly results in mTOR inhibition and autophagy induction.\",\n      \"method\": \"Knockout cell lines (hTERT-RPE1), ubiquitin proteomics, co-immunoprecipitation, mTORC1 activity assays, lysosomal fractionation, C. elegans genetic model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (proteomics, KO, IP, cross-species validation), mechanistic pathway defined with substrate (LAMTOR1) and functional consequence (mTORC1/autophagy)\",\n      \"pmids\": [\"36476874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP32 deubiquitylates Rab35 by reducing Lys48 (K48)-linked ubiquitination, protecting Rab35 from proteasomal degradation and thereby upregulating Rab35 expression. This increases exosome secretion from imatinib-resistant GISTs, transmitting drug resistance to sensitive tumors. The transcription factor ETV1 promotes USP32 expression.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, iTRAQ proteomics, loss-of-function experiments, exosome secretion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with substrate (Rab35), ubiquitination assays, functional exosome assays, single lab\",\n      \"pmids\": [\"36725886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"USP32 interacts with BAG3 and deubiquitinates and stabilizes BAG3 in a deubiquitinating activity-dependent manner in non-small cell lung cancer cells, thereby increasing phosphorylation of the RAF/MEK/ERK signaling pathway and promoting NSCLC proliferation, migration, and EMT.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, mass spectrometry interactome screen, Western blotting, in vitro and in vivo functional assays\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — substrate identification (BAG3) by Co-IP and MS, deubiquitination assay, rescue experiments, single lab\",\n      \"pmids\": [\"39030175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP32 is identified by review as controlling the stability of multiple distinct proteins and is implicated in cell cycle progression, proliferation, migration, and invasion across multiple cancer types including small cell lung cancer, gastric cancer, breast cancer, glioblastoma, and GISTs.\",\n      \"method\": \"Review/synthesis of experimental literature\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — review article, no new direct experimental evidence\",\n      \"pmids\": [\"37679322\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"USP32 is a membrane-associated (Golgi-localized) deubiquitylating enzyme that removes ubiquitin from multiple substrates including Rab7 (regulating late endosome transport/recycling via RILP and retromer), LAMTOR1 (controlling mTORC1 activation and autophagy induction at lysosomes), Rab35 (modulating exosome secretion), SLC35F2 (governing drug uptake), and BAG3 (activating RAF-MEK-ERK signaling), with loss-of-function causing defective endosomal trafficking, reduced mTORC1 activity, autophagy induction, and impaired cell proliferation and migration.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper, then extract discoveries only from KEEP papers about USP32.\n\n**Classification:**\n- Papers [1]-[21], [22] (about USP10): These are about USP10, not USP32 → EXCLUDE (alias collision - different USP family member)\n- Paper [22] \"USP32 regulates late endosomal transport and recycling through deubiquitylation of Rab7\" (PMID:30926795) → KEEP\n- Paper [31] \"USP32 is an active, membrane-bound ubiquitin protease overexpressed in breast cancers\" (PMID:20549504) → KEEP\n- Paper [51] \"USP32 promotes tumorigenesis and chemoresistance in gastric carcinoma via upregulation of SMAD2\" (PMID:32226309) → KEEP\n- Paper [54] \"Downregulation of USP32 inhibits cell proliferation, migration and invasion in human small cell lung cancer\" (PMID:28597490) → KEEP\n- Paper [67] \"USP32 deubiquitinase: cellular functions, regulatory mechanisms, and potential as a cancer therapy target\" (PMID:37679322) → KEEP (review, but cites mechanistic findings)\n- Paper [68] \"USP32 confers cancer cell resistance to YM155 via promoting ER-associated degradation of solute carrier protein SLC35F2\" (PMID:34815782) → KEEP\n- Paper [69] \"USP32-regulated LAMTOR1 ubiquitination impacts mTORC1 activation and autophagy induction\" (PMID:36476874) → KEEP\n- Paper [74] \"Deubiquitylation of Rab35 by USP32 promotes the transmission of imatinib resistance by enhancing exosome secretion in gastrointestinal stromal tumours\" (PMID:36725886) → KEEP\n- Paper [88] \"USP32 facilitates non-small cell lung cancer progression via deubiquitinating BAG3 and activating RAF-MEK-ERK signaling pathway\" (PMID:39030175) → KEEP\n- Paper [95] \"MicroRNA let-7a inhibits proliferation of breast cancer cell by downregulating USP32 expression\" (PMID:35116927) → KEEP\n\nAdditional gene2pubmed papers:\n- [3] \"Defining the human deubiquitinating enzyme interaction landscape\" (PMID:19615732) → KEEP (includes USP32 in DUB interactome)\n- [19] \"The Tre2 (USP6) oncogene is a hominoid-specific gene\" (PMID:12604796) → KEEP (establishes USP32 as ancestral gene)\n- All other gene2pubmed papers: proteomics/interactome databases, cDNA sequencing, phosphoproteomics, etc. — largely non-mechanistic for USP32 specifically → EXCLUDE for mechanistic discoveries\n\nPapers [60] (circ-Usp10 - circRNA) → EXCLUDE (alt-locus product)\nPapers [12] (circWSB1) → EXCLUDE (circRNA)\n\nNow extracting discoveries from KEEP papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2010,\n      \"finding\": \"USP32 encodes an active deubiquitinating enzyme with conserved catalytic USP-domain residues (asparagine, cysteine, histidine, aspartic acid) and localizes to the Golgi apparatus, as demonstrated by GFP-fusion fluorescence protection assay and BODIPY-TR staining. Stable silencing of USP32 significantly decreases cell proliferation and migration rates.\",\n      \"method\": \"GFP-fusion fluorescence protection assay, BODIPY-TR Golgi staining, stable shRNA knockdown with proliferation and migration assays\",\n      \"journal\": \"Mammalian Genome\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct localization experiment with functional consequence (migration/proliferation phenotype), single lab with orthogonal methods\",\n      \"pmids\": [\"20549504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"USP32 (also known as NY-REN-60) is an ancient, highly conserved deubiquitinase gene that served as the ancestral template for the hominoid-specific oncogene Tre2 (USP6), which arose through chimeric fusion of USP32 with TBC1D3. USP32 is broadly expressed across tissues, in contrast to the testis-specific Tre2.\",\n      \"method\": \"Phylogenetic analysis, genomic sequencing, expression profiling\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genomic/evolutionary characterization with expression data; establishes identity and conservation of USP32\",\n      \"pmids\": [\"12604796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Global proteomic analysis of deubiquitinase interaction networks identified USP32 as a DUB with candidate interacting proteins, placing it within the broader DUB interaction landscape.\",\n      \"method\": \"Affinity purification–mass spectrometry (AP-MS) with CompPASS bioinformatics\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — large-scale AP-MS; USP32-specific interactions not individually validated in this study\",\n      \"pmids\": [\"19615732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Silencing of USP32 in small cell lung cancer (SCLC) cells inhibits proliferation and migration, arrests the cell cycle at G0/G1 phase by decreasing CDK4/Cyclin D1 complex and elevating p21, induces apoptosis via activation of cleaved caspase-3 and cleaved PARP, and reduces cell invasiveness by altering EMT marker expression.\",\n      \"method\": \"siRNA knockdown, cell viability assay, cell cycle analysis by flow cytometry, Western blotting for CDK4/Cyclin D1/p21/caspase-3/PARP, invasion assay\",\n      \"journal\": \"Cell Proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — clean KD with multiple defined cellular phenotypes and molecular markers; single lab\",\n      \"pmids\": [\"28597490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"USP32 deubiquitylates Rab7, the small GTPase central to late endosome (LE) biology. Loss of USP32 inhibits late endosome transport and recycling of LE cargos, resulting in dispersion and swelling of the late endosomal compartment. SILAC-based ubiquitome profiling identified Rab7 as a USP32 substrate. The LE transport effector RILP preferentially binds ubiquitylation-deficient Rab7, while retromer-mediated LE recycling requires an intact cycle of Rab7 ubiquitylation, suggesting USP32-dependent reversible ubiquitylation switches Rab7 between its transport and recycling functions.\",\n      \"method\": \"SILAC-based ubiquitome profiling, USP32 knockout/knockdown, live-cell imaging, cargo recycling assays, Co-IP with RILP and retromer\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — SILAC ubiquitome identifies substrate, KO phenotype with multiple orthogonal readouts, mechanistic dissection of RILP vs. retromer preference; single lab but strong methodology\",\n      \"pmids\": [\"30926795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP32 knockdown or depletion significantly inhibits gastric cancer (GC) cell proliferation and migration in vitro and in vivo. Mechanistically, USP32 silencing causes decreased expression of SMAD2, and re-introduction of SMAD2 rescues the inhibitory effects, indicating USP32 promotes GC progression through stabilization of SMAD2.\",\n      \"method\": \"siRNA/shRNA knockdown, in vivo xenograft, immunohistochemistry, Western blotting, SMAD2 rescue experiments\",\n      \"journal\": \"International Journal of Biological Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — KD with in vivo validation and rescue experiment identifying SMAD2 as downstream effector; single lab\",\n      \"pmids\": [\"32226309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRISPR-based dual screening identified USP32 as a deubiquitinase that destabilizes SLC35F2 (a solute-carrier protein essential for uptake of the anticancer compound YM155), thereby conferring YM155 resistance. USP32 and SLC35F2 expression are negatively correlated; targeted USP32 knockout verified it as the main determinant of SLC35F2 protein stability in vitro and in vivo. USP32 promotes ER-associated degradation of SLC35F2.\",\n      \"method\": \"Genome-scale CRISPR-Cas9 knockout screen, Western blotting, in vivo xenograft, co-immunoprecipitation, ubiquitination assays\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — unbiased genome-scale screen followed by mechanistic validation with KO, in vivo confirmation, and substrate identification; multiple orthogonal methods\",\n      \"pmids\": [\"34815782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP32 knockout in hTERT-RPE1 cells results in hyperubiquitination of LAMTOR1, a Ragulator complex subunit. Accumulation of LAMTOR1 ubiquitination impairs its interaction with the vacuolar H+-ATPase, reduces Ragulator function, limits mTORC1 recruitment to lysosomes, decreases mTORC1 activity, and induces autophagy. Depletion of the USP32 homolog CYK-3 in C. elegans similarly results in mTOR inhibition and autophagy induction.\",\n      \"method\": \"USP32 knockout (CRISPR), ubiquitome proteomics, mTOR localization by immunofluorescence, mTORC1 activity assays (S6K/4E-BP1 phosphorylation), v-ATPase interaction Co-IP, C. elegans CYK-3 depletion\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — KO with ubiquitome profiling identifies substrate, multiple orthogonal functional readouts, cross-species validation in C. elegans\",\n      \"pmids\": [\"36476874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP32 deubiquitylates Rab35 by removing K48-linked ubiquitin chains, protecting it from proteasomal degradation. Elevated Rab35 in imatinib-resistant GISTs increases exosome secretion that transmits drug resistance to sensitive tumors. The transcription factor ETV1 promotes USP32 expression in GISTs.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays (K48-linkage specific), Rab35 knockdown/overexpression, exosome secretion quantification, iTRAQ proteomics, ETV1 ChIP/reporter assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — substrate identification with linkage-specific ubiquitination assay, mechanistic epistasis (USP32→Rab35→exosome secretion→resistance), upstream regulator identified\",\n      \"pmids\": [\"36725886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-let-7a directly targets the 3'-UTR of USP32 mRNA to suppress its protein expression, and overexpression of USP32 reverses let-7a-mediated inhibition of MCF-7 breast cancer cell proliferation, placing USP32 downstream of let-7a in a proliferation-regulatory axis.\",\n      \"method\": \"miRNA mimic/inhibitor transfection, dual-luciferase reporter assay (3'-UTR), Western blotting, MTT proliferation assay, colony formation\",\n      \"journal\": \"Translational Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct 3'-UTR targeting validated by luciferase assay, rescue experiment confirms USP32 as functional downstream target; single lab\",\n      \"pmids\": [\"35116927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"USP32 interacts with BAG3 and deubiquitinates and stabilizes BAG3 protein in a deubiquitinating activity-dependent manner in non-small cell lung cancer (NSCLC) cells. USP32-mediated BAG3 stabilization increases phosphorylation of the RAF/MEK/ERK signaling pathway. Restoration of BAG3 abrogates antitumor effects of USP32 silencing, establishing USP32→BAG3→RAF/MEK/ERK as an oncogenic axis in NSCLC.\",\n      \"method\": \"AP-MS to identify interacting proteins, Co-IP, ubiquitination assays, shRNA knockdown, BAG3 rescue experiments, Western blotting for RAF/MEK/ERK phosphorylation, in vivo xenograft\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — substrate identified by AP-MS and validated by Co-IP and ubiquitination assay, pathway placement via rescue; single lab\",\n      \"pmids\": [\"39030175\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"USP32 is an active, Golgi-localized deubiquitinase that regulates endosomal trafficking by deubiquitylating the small GTPases Rab7 (controlling late endosome transport/recycling) and Rab35 (controlling exosome secretion), controls lysosomal mTORC1 signaling by removing non-proteolytic ubiquitin from LAMTOR1, promotes cancer cell survival and proliferation through substrates including SLC35F2 (ER-associated degradation), BAG3 (activating RAF-MEK-ERK), and SMAD2, and is itself regulated at the mRNA level by miR-let-7a.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"USP32 is a Golgi-associated deubiquitylating enzyme that controls endosomal trafficking, lysosomal signaling, and exosome secretion by removing ubiquitin from multiple membrane-associated substrates. It deubiquitylates Rab7 to regulate the balance between late endosome transport (via RILP) and recycling (via retromer), such that USP32 loss causes late compartment dispersion and swelling [PMID:30926795]. USP32 also deubiquitylates LAMTOR1, a Ragulator complex subunit, to sustain vacuolar H⁺-ATPase interaction and mTORC1 recruitment to lysosomes; its loss hyperubiquitylates LAMTOR1, reduces mTORC1 activity, and induces autophagy, a function conserved in C. elegans [PMID:36476874]. Additional substrates include Rab35, whose K48-linked deubiquitylation by USP32 stabilizes it to promote exosome secretion [PMID:36725886], BAG3, whose stabilization activates RAF-MEK-ERK signaling [PMID:39030175], and SLC35F2, whose USP32-dependent destabilization controls drug uptake [PMID:34815782].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Establishing that USP32 is an active DUB with Golgi localization and a role in cell proliferation and migration provided the initial functional framework for subsequent mechanistic studies.\",\n      \"evidence\": \"GFP-fusion fluorescence protection assay with BODIPY-TR Golgi co-staining and stable shRNA knockdown in mammalian cells\",\n      \"pmids\": [\"20549504\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No substrate identified\",\n        \"Proliferation/migration mechanism undefined\",\n        \"Catalytic activity demonstrated only by domain conservation, not by in vitro DUB assay\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Knockdown phenotyping in SCLC cells linked USP32 to cell cycle control (G0/G1 arrest via CDK4/Cyclin D1 and p21), apoptosis, and EMT, broadening its functional scope beyond trafficking.\",\n      \"evidence\": \"siRNA knockdown with flow cytometry, Western blotting, and invasion assays in SCLC cells\",\n      \"pmids\": [\"28597490\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct DUB substrates mediating these phenotypes not identified\",\n        \"Single cancer cell type studied\",\n        \"No rescue with catalytic-dead mutant to confirm DUB-dependence\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of Rab7 as a direct USP32 substrate revealed how reversible ubiquitylation acts as a molecular switch between RILP-mediated late endosome transport and retromer-mediated recycling, providing the first defined substrate-mechanism link for USP32.\",\n      \"evidence\": \"SILAC ubiquitome profiling, USP32 KO, co-IP, live-cell imaging, and electron microscopy in human cells\",\n      \"pmids\": [\"30926795\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Ubiquitin chain type on Rab7 not fully characterized\",\n        \"Structural basis for USP32-Rab7 recognition unknown\",\n        \"Whether Golgi-localized USP32 acts on Rab7 at the Golgi or is relocated to endosomes is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linking USP32 to SMAD2 stabilization in gastric cancer extended its substrate repertoire to TGF-β signaling and chemoresistance, though the directness of this interaction is less rigorously established.\",\n      \"evidence\": \"siRNA/shRNA knockdown, co-IP, and in vitro/in vivo tumor growth assays in gastric cancer cells\",\n      \"pmids\": [\"32226309\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct deubiquitylation of SMAD2 not demonstrated with purified proteins\",\n        \"Ubiquitin linkage type on SMAD2 not defined\",\n        \"Single cancer context\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A genome-scale CRISPR screen identified USP32 as the principal determinant of SLC35F2 stability, showing that USP32 paradoxically destabilizes this solute carrier via ER-associated degradation to limit drug uptake.\",\n      \"evidence\": \"CRISPR-Cas9 genome-wide KO screen, dual screening, Western blot, in vivo xenograft validation\",\n      \"pmids\": [\"34815782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which a DUB promotes rather than prevents degradation of SLC35F2 is incompletely resolved\",\n        \"Whether USP32 deubiquitylates an ERAD component rather than SLC35F2 directly remains open\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of LAMTOR1 as a USP32 substrate connected the enzyme to mTORC1 signaling at lysosomes and autophagy regulation, with cross-species validation in C. elegans demonstrating evolutionary conservation.\",\n      \"evidence\": \"USP32 KO in hTERT-RPE1 cells, ubiquitin proteomics, co-IP, lysosomal fractionation, mTORC1 activity assays, C. elegans CYK-3 depletion\",\n      \"pmids\": [\"36476874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific ubiquitylation sites on LAMTOR1 controlled by USP32 not fully mapped\",\n        \"Whether USP32 acts on LAMTOR1 at the Golgi before delivery to lysosomes or at the lysosomal membrane is unclear\",\n        \"Physiological consequences of USP32 loss on whole-organism mTOR signaling in mammals not established\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"USP32 was shown to stabilize Rab35 by removing K48-linked ubiquitin, thereby promoting exosome secretion and intercellular transfer of drug resistance in GISTs, adding exosome biology to USP32's functional portfolio.\",\n      \"evidence\": \"Co-IP, K48-ubiquitin assays, iTRAQ proteomics, exosome secretion assays in imatinib-resistant GIST cells\",\n      \"pmids\": [\"36725886\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"In vivo exosome-mediated resistance transfer not confirmed\",\n        \"Whether ETV1-driven USP32 transcription is a general or GIST-specific mechanism is unknown\",\n        \"Reciprocal validation of USP32-Rab35 interaction limited\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of BAG3 as a USP32 substrate linked the enzyme to RAF-MEK-ERK signaling activation, EMT, and NSCLC progression, demonstrating DUB activity-dependent stabilization.\",\n      \"evidence\": \"Co-IP, mass spectrometry interactome, ubiquitination assays, catalytic mutant rescue, in vitro and in vivo NSCLC assays\",\n      \"pmids\": [\"39030175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Ubiquitin chain type on BAG3 not characterized\",\n        \"Whether BAG3 stabilization explains the previously observed proliferation phenotype in other cancer types is untested\",\n        \"Independent replication in a second lab pending\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How USP32 achieves substrate selectivity among its diverse membrane-associated substrates, and whether its Golgi localization spatially restricts its activity or whether it redistributes to endosomal/lysosomal compartments, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of USP32 or substrate-recognition domains available\",\n        \"Spatial regulation of USP32 activity across endomembrane compartments not resolved\",\n        \"No mouse knockout or human genetic disease phenotype reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 4, 5, 6, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 7]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 4, 5, 6, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"RAB7A\",\n      \"LAMTOR1\",\n      \"RAB35\",\n      \"BAG3\",\n      \"SLC35F2\",\n      \"SMAD2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"USP32 is a broadly expressed, Golgi-localized deubiquitinating enzyme that controls endosomal and lysosomal trafficking by reversibly removing ubiquitin from small GTPases and lysosomal signaling components. It deubiquitylates Rab7 to regulate the balance between late-endosome transport and retromer-mediated recycling [PMID:30926795], deubiquitylates Rab35 (K48-linked chains) to promote exosome secretion [PMID:36725886], and removes non-proteolytic ubiquitin from the Ragulator subunit LAMTOR1 to sustain vacuolar H⁺-ATPase interaction and mTORC1 recruitment at lysosomes [PMID:36476874]. USP32 also stabilizes oncogenic substrates including SLC35F2 (via ER-associated degradation) [PMID:34815782], BAG3 (activating the RAF–MEK–ERK cascade) [PMID:39030175], and SMAD2 [PMID:32226309], linking its deubiquitinase activity to cancer cell proliferation, migration, and drug resistance across multiple tumor types.\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing the evolutionary identity of USP32 as an ancient, broadly expressed DUB that served as the ancestral template for the hominoid-specific oncogene USP6 (Tre2) resolved the gene's origin and indicated functional conservation across vertebrates.\",\n      \"evidence\": \"Phylogenetic and genomic analysis of USP32/TBC1D3/USP6 loci with expression profiling\",\n      \"pmids\": [\"12604796\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical DUB activity demonstrated at this point\", \"Endogenous substrates unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrating that USP32 possesses conserved catalytic residues, localizes to the Golgi apparatus, and is required for normal cell proliferation and migration established its enzymatic competence and subcellular context.\",\n      \"evidence\": \"GFP-fusion fluorescence protection assay with BODIPY-TR Golgi costaining, shRNA knockdown with proliferation/migration assays\",\n      \"pmids\": [\"20549504\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro DUB activity not directly measured\", \"No substrates identified\", \"Golgi localization not confirmed by endogenous staining\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing that USP32 silencing arrests cells in G0/G1 (via CDK4/Cyclin D1 loss and p21 induction), activates apoptosis, and suppresses EMT markers in SCLC cells expanded the proliferative phenotype to a defined cell-cycle and apoptotic mechanism.\",\n      \"evidence\": \"siRNA knockdown with flow cytometry, Western blotting for cell-cycle regulators and EMT markers, invasion assays in SCLC lines\",\n      \"pmids\": [\"28597490\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DUB substrates mediating cell-cycle effects unidentified\", \"Single cancer type examined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of Rab7 as a direct USP32 substrate via SILAC ubiquitome profiling, and demonstration that USP32-dependent deubiquitylation toggles Rab7 between RILP-mediated transport and retromer-mediated recycling, provided the first mechanistic link between USP32 and endosomal trafficking.\",\n      \"evidence\": \"SILAC ubiquitome profiling in USP32-KO hTERT-RPE1 cells, live-cell imaging, cargo recycling assays, co-IP with RILP and retromer subunits\",\n      \"pmids\": [\"30926795\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin chain type on Rab7 not fully defined\", \"Upstream signals regulating USP32-Rab7 axis unknown\", \"Impact on in vivo endosomal trafficking not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Validation that miR-let-7a directly targets the USP32 3′-UTR to suppress its expression, with USP32 re-expression rescuing proliferation, established a post-transcriptional regulatory input controlling USP32 abundance.\",\n      \"evidence\": \"Dual-luciferase 3′-UTR reporter assay, miRNA mimic/inhibitor transfection, rescue experiments in MCF-7 cells\",\n      \"pmids\": [\"35116927\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological contexts where let-7a–USP32 axis operates are uncharacterized\", \"Other miRNAs regulating USP32 not surveyed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstration that USP32 stabilizes SMAD2 in gastric cancer, with SMAD2 re-expression rescuing proliferation/migration upon USP32 loss, expanded the substrate repertoire to TGF-β signaling components.\",\n      \"evidence\": \"shRNA knockdown with SMAD2 rescue, in vivo xenograft, IHC\",\n      \"pmids\": [\"32226309\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct deubiquitylation of SMAD2 not shown with in vitro DUB assay\", \"Ubiquitin chain type on SMAD2 undetermined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"An unbiased CRISPR screen identified USP32 as the principal determinant of SLC35F2 protein stability, revealing that USP32 paradoxically promotes ER-associated degradation of SLC35F2 to confer drug resistance, uncovering a non-canonical substrate relationship.\",\n      \"evidence\": \"Genome-scale CRISPR KO screen, USP32 KO validation, co-IP, ubiquitination assays, in vivo xenograft\",\n      \"pmids\": [\"34815782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which a DUB promotes ERAD of SLC35F2 is not fully resolved\", \"Whether USP32 acts on an intermediate rather than SLC35F2 directly is unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that USP32 deubiquitylates LAMTOR1 to maintain Ragulator–v-ATPase interaction and mTORC1 lysosomal recruitment, confirmed cross-species by CYK-3 depletion in C. elegans, established USP32 as a gatekeeper of nutrient-sensing signaling.\",\n      \"evidence\": \"USP32 CRISPR-KO, ubiquitome proteomics, mTORC1 activity assays (S6K/4E-BP1 phosphorylation), v-ATPase co-IP, C. elegans CYK-3 depletion\",\n      \"pmids\": [\"36476874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin chain type on LAMTOR1 not specified\", \"Whether USP32 acts at lysosomes or Golgi for LAMTOR1 deubiquitylation is unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of Rab35 as a USP32 substrate (K48-linked ubiquitin removal) that links USP32 to exosome-mediated transmission of imatinib resistance in GISTs extended the DUB's trafficking role to the exosome biogenesis pathway and revealed ETV1 as a transcriptional activator of USP32.\",\n      \"evidence\": \"K48-linkage-specific ubiquitination assays, Rab35 KD/OE, exosome quantification, ETV1 ChIP and reporter assays in GIST cells\",\n      \"pmids\": [\"36725886\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether USP32–Rab35 axis operates outside the GIST context is untested\", \"Other chain types on Rab35 not examined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of BAG3 as a direct USP32 substrate that activates RAF–MEK–ERK signaling in NSCLC established a new oncogenic axis and demonstrated substrate-level epistasis through BAG3 rescue experiments.\",\n      \"evidence\": \"AP-MS, co-IP, ubiquitination assays, shRNA KD with BAG3 rescue, RAF/MEK/ERK phosphorylation Western blots, in vivo xenograft\",\n      \"pmids\": [\"39030175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin chain type on BAG3 not determined\", \"Whether BAG3 stabilization connects to the mTORC1/autophagy axis is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A unified structural and regulatory model explaining how USP32 selects among its diverse substrates (Rab7, Rab35, LAMTOR1, BAG3, SMAD2, SLC35F2), whether substrate access is determined by Golgi/endosome localization or by adaptor proteins, and how USP32's own catalytic activity is regulated post-translationally, remains to be established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal structure or cryo-EM structure available\", \"No post-translational regulatory mechanism for USP32 activity defined\", \"Substrate selectivity determinants unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 4, 6, 7, 8, 10]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 4, 7, 8, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [4, 8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 10]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 6, 7, 8, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RAB7A\", \"RAB35\", \"LAMTOR1\", \"BAG3\", \"SMAD2\", \"SLC35F2\"],\n    \"other_free_text\": []\n  }\n}\n```"}