{"gene":"WDR20","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2010,"finding":"WDR20 was identified as a common binding partner of UAF1, USP12, and USP46. WDR20 associates exclusively with USP12 and USP46, not with USP1. A ternary USP12·UAF1·WDR20 complex was purified, and WDR20 stimulated the enzymatic activity of USP12·UAF1 but not USP1·UAF1. siRNA-mediated depletion of WDR20 did not affect the Fanconi anemia pathway or DNA damage responses.","method":"Co-immunoprecipitation, affinity pulldown, in vitro DUB activity assay, siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — reciprocal Co-IP, purified ternary complex, in vitro enzymatic assay with multiple substrates tested, single lab with multiple orthogonal methods","pmids":["20147737"],"is_preprint":false},{"year":2016,"finding":"Crystal structures of USP12 in complex with UAF1 and WDR20 revealed that UAF1 and WDR20 interact with USP12 at two distinct sites far from its catalytic center. UAF1 docks at the distal end of the USP12 Fingers domain and induces a cascade of structural changes reaching a ubiquitin-contacting loop adjacent to the catalytic cleft. WDR20 anchors at the base of this loop and remotely modulates the catalytic center. Neither cofactor increases substrate affinity; instead they potentiate USP12 through distinct allosteric mechanisms.","method":"X-ray crystallography, in vitro biochemical assays, structural mutagenesis analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional biochemical validation, multiple orthogonal methods in single rigorous study","pmids":["27373336"],"is_preprint":false},{"year":2013,"finding":"C. elegans WDR-20 (ortholog of WDR20) binds and stimulates the catalytic activity of USP-46 in vitro. Overexpression of WDR-20 in vivo increases GLR-1 glutamate receptor abundance in the ventral nerve cord, correlating with decreased ubiquitin-GLR-1 conjugates, indicating WDR-20 promotes deubiquitination and stabilization of GLR-1. Loss-of-function wdr-20 mutants show locomotion defects consistent with decreased glutamatergic signaling, and the locomotion effect of WDR-20/WDR-48 overexpression is blocked in usp-46 loss-of-function mutants.","method":"In vitro DUB activity assay, C. elegans genetics (overexpression, loss-of-function mutants), ubiquitin conjugate immunoblotting, behavioral assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro biochemical assay combined with in vivo genetic epistasis and biochemical readout of ubiquitination, multiple orthogonal methods","pmids":["24356955"],"is_preprint":false},{"year":2018,"finding":"WDR20 promotes recruitment of USP12 to the plasma membrane and regulates dynamic shuttling of the USP12/UAF1/WDR20 complex between the plasma membrane, cytoplasm, and nucleus. This shuttling is mediated by CRM1-dependent nuclear export and requires a short N-terminal motif (1MEIL4) in USP12 and a novel nuclear export sequence (450MDGAIASGVSKFATLSLHD468) in WDR20. WDR20 promotes plasma membrane recruitment of USP12 but not USP46. Site-directed mutagenesis of these sequences abolished the relevant localizations.","method":"Confocal and live-cell microscopy, site-directed mutagenesis, CRM1 inhibitor treatment, subcellular fractionation","journal":"European journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional mutagenesis, multiple mutants tested, pharmacological validation, single lab","pmids":["30466959"],"is_preprint":false},{"year":2015,"finding":"WDR20 and UAF1 (Uaf-1) are required for USP12 stabilization in prostate cancer cells. Individual silencing of either UAF1 or WDR20 is sufficient to abrogate USP12 complex activity, down-regulate androgen receptor (AR)-mediated transcription via AR destabilization, and result in increased apoptosis and decreased colony-forming ability of prostate cancer cells. USP12/UAF1/WDR20 complex presence was confirmed in prostate cancer cells by co-immunoprecipitation.","method":"Co-immunoprecipitation, siRNA silencing, AR transcriptional reporter assays, apoptosis assays, colony formation assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal Co-IP confirmed complex, functional knockdown with multiple readouts, single lab","pmids":["26462181"],"is_preprint":false},{"year":2016,"finding":"WDR20 downregulation due to 14q copy number loss is associated with malignant transformation in clear cell renal cell carcinoma. Exogenous WDR20 expression significantly inhibited growth of RCC cell lines and induced apoptosis. WDR20 overexpression clearly reduced phosphorylation levels of ERK and AKT in RCC cells.","method":"Exogenous WDR20 expression in RCC cell lines, proliferation assays, apoptosis assays, phospho-ERK and phospho-AKT immunoblotting","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional overexpression with defined signaling readouts, single lab, no direct mechanistic link to DUB complex established in this study","pmids":["26790128"],"is_preprint":false},{"year":2018,"finding":"WDR20 is a novel regulator of endoplasmic reticulum-associated degradation (ERAD). WDR20 depletion inhibits degradation of TCRα (an ERAD substrate), while WDR20 overexpression reduces TCRα protein level. WDR20 associates with TCRα, p97, GP78, and HRD1. A portion of WDR20 localizes to the ER-containing microsomal membrane. WDR20 increases TCRα ubiquitination in an HRD1 E3 ligase-dependent manner and acts as an adaptor to mediate the interaction between p97 and TCRα.","method":"CRISPR-based screen, siRNA knockdown, WDR20 overexpression, co-immunoprecipitation, subcellular fractionation, ubiquitination assay","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — CRISPR screen followed by mechanistic follow-up with Co-IP and biochemical fractionation, multiple orthogonal methods, single lab","pmids":["29655804"],"is_preprint":false},{"year":2021,"finding":"In C. elegans, WDR-20 (ortholog of WDR20) regulates local insertion of GLR-1 AMPA receptors into the neuronal cell surface in a USP-46-dependent manner. Increased expression of WDR-20, but not WDR-48, is sufficient to increase GLR-1 surface levels dependent on USP-46. Loss of wdr-20 reduces rate of local GLR-1 insertion in neurites; overexpression of wdr-20 increases GLR-1 insertion rate. Genetic manipulations altering glutamate signaling produce reciprocal changes in wdr-20 transcription (activity-regulated expression), and homeostatic compensatory changes in surface GLR-1 levels are dependent on wdr-20.","method":"C. elegans genetics (loss-of-function mutants, overexpression), live imaging of GLR-1 surface levels and insertion rates, epistasis with usp-46 mutants","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic epistasis experiments with orthogonal live imaging and behavioral readouts, extends prior replication across labs","pmids":["33622778"],"is_preprint":false},{"year":2021,"finding":"DMWD (a WDR20 paralog) binds both USP12 and USP46 and shares the same binding interface in USP12 as WDR20, suggesting their interactions with USP12 may be mutually exclusive. Both DMWD and WDR20 promote USP12 enzymatic activity, but they differentially modulate the subcellular localization of USP12. Molecular evolution analysis reveals WDR20 and DMWD arose by duplication from a common ancestor.","method":"Co-immunoprecipitation of epitope-tagged proteins, in vitro DUB activity assay, subcellular localization microscopy, phylogenetic analysis","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct Co-IP confirmed binding, in vitro activity assay, localization imaging, single lab","pmids":["33844468"],"is_preprint":false},{"year":2024,"finding":"WDR20 silencing in hepatocellular carcinoma (HCC) cells selectively inhibits HCC proliferation without affecting normal hepatocytes. WDR20 knockdown induces HCC cellular senescence and suppresses tumor progression in multiple in vivo HCC models. Mechanistically, WDR20 silencing disturbs c-Myc protein stability by orchestrating simultaneous USP12/46-mediated deubiquitination of c-Myc, thereby promoting CDKN1A transcriptional activation. WDR20 and c-Myc show positive co-expression in HCC clinical samples. WDR20 silencing decreased c-Myc expression and induced senescence in patient-derived HCC organoids.","method":"siRNA library screen, siRNA knockdown, xenograft and transgenic HCC mouse models, hydrodynamic tail vein injection model, co-immunoprecipitation, ubiquitination assay, patient-derived organoids, tissue microarray","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal in vivo models, biochemical mechanistic assays, patient-derived organoid validation, single lab with strong evidence","pmids":["39432777"],"is_preprint":false}],"current_model":"WDR20 is a WD40-repeat β-propeller protein that functions as a stimulatory/regulatory subunit of the USP12·UAF1·WDR20 (and USP46·UAF1·WDR20) ternary deubiquitinase complex: it allosterically activates USP12 catalytic activity by anchoring at the base of a ubiquitin-contacting loop and remotely modulating the catalytic center, promotes CRM1-dependent shuttling of the complex between the plasma membrane, cytoplasm, and nucleus (via a nuclear export sequence in WDR20 and an N-terminal motif in USP12), and in neurons drives deubiquitination and surface stabilization of AMPA/glutamate receptors; additionally, WDR20 has been shown to act as an ERAD adaptor linking p97 to substrates via HRD1, and its regulation of USP12/46-mediated deubiquitination of c-Myc prevents HCC cellular senescence."},"narrative":{"mechanistic_narrative":"WDR20 is a WD40-repeat protein that functions as a regulatory subunit of the USP12·UAF1 and USP46·UAF1 deubiquitinase complexes, binding selectively to USP12 and USP46 (but not USP1) and stimulating their catalytic activity [PMID:20147737]. Structural analysis shows that WDR20 and UAF1 dock at two distinct sites far from the USP12 catalytic center: WDR20 anchors at the base of a ubiquitin-contacting loop adjacent to the catalytic cleft and allosterically potentiates the enzyme without increasing substrate affinity [PMID:27373336]. Beyond activation, WDR20 controls the subcellular distribution of the complex, recruiting USP12 to the plasma membrane and driving CRM1-dependent shuttling between membrane, cytoplasm, and nucleus via a nuclear export sequence in WDR20 and an N-terminal motif in USP12 [PMID:30466959]. Through this DUB-stimulatory role WDR20 deubiquitinates and stabilizes specific substrates: in neurons it promotes deubiquitination, surface insertion, and stabilization of GLR-1/AMPA-type glutamate receptors in a USP-46-dependent, activity-regulated manner [PMID:24356955, PMID:33622778], and in hepatocellular carcinoma it orchestrates USP12/46-mediated deubiquitination of c-Myc, so that its loss destabilizes c-Myc, activates CDKN1A, and triggers cellular senescence [PMID:39432777]. WDR20 supports the viability and proliferation of multiple cancers, stabilizing the androgen receptor in prostate cancer [PMID:26462181] and acting as a tumor suppressor whose loss promotes malignant transformation in renal cell carcinoma [PMID:26790128]. Independently of its DUB role, WDR20 also acts as an ERAD adaptor that links p97 to substrates and promotes HRD1-dependent ubiquitination and degradation of TCRα [PMID:29655804].","teleology":[{"year":2010,"claim":"Established WDR20 as a dedicated, selective subunit of the USP12/USP46 deubiquitinase complexes rather than a general DUB cofactor, defining its core biochemical identity.","evidence":"Co-IP, affinity purification of a ternary complex, and in vitro DUB assays in human cells","pmids":["20147737"],"confidence":"High","gaps":["Molecular basis of activation not resolved","Physiological substrates not identified","No role in the Fanconi anemia/USP1 pathway"]},{"year":2013,"claim":"Defined a physiological substrate axis by showing the WDR20 ortholog stimulates USP-46 to deubiquitinate and stabilize glutamate receptors, linking the complex to neuronal signaling.","evidence":"In vitro DUB assay plus C. elegans genetics, ubiquitin-conjugate immunoblotting, and behavioral epistasis with usp-46","pmids":["24356955"],"confidence":"High","gaps":["Mechanism of GLR-1 selectivity unknown","Conservation in mammalian neurons not tested","Direct vs indirect deubiquitination not distinguished"]},{"year":2015,"claim":"Showed WDR20 is required for USP12 complex activity and stability in cancer, coupling it to androgen receptor signaling and cell survival.","evidence":"Co-IP, siRNA silencing, AR reporter, apoptosis and colony assays in prostate cancer cells","pmids":["26462181"],"confidence":"Medium","gaps":["Whether AR is a direct DUB substrate not established","Single cell-type context","No in vivo validation"]},{"year":2016,"claim":"Resolved the structural mechanism, showing WDR20 activates USP12 allosterically from a remote site adjacent to the catalytic cleft rather than by enhancing substrate binding.","evidence":"X-ray crystallography of USP12·UAF1·WDR20 with structural mutagenesis and biochemical validation","pmids":["27373336"],"confidence":"High","gaps":["Structures of substrate-bound states absent","How allostery translates to specific substrates unknown"]},{"year":2016,"claim":"Implicated WDR20 as a growth-suppressive gene lost in renal cancer, linking its downregulation to ERK/AKT signaling.","evidence":"Exogenous WDR20 expression in RCC lines with proliferation, apoptosis, and phospho-ERK/AKT immunoblotting","pmids":["26790128"],"confidence":"Medium","gaps":["No mechanistic link to the DUB complex in this context","Direct effectors of ERK/AKT modulation unknown","Tumor-suppressor role conflicts with pro-survival roles elsewhere"]},{"year":2018,"claim":"Uncovered a DUB-independent function: WDR20 acts as an ERAD adaptor bridging p97 to substrates and promoting HRD1-dependent degradation.","evidence":"CRISPR screen, siRNA/overexpression, Co-IP with p97/GP78/HRD1, fractionation, and ubiquitination assays on TCRα","pmids":["29655804"],"confidence":"Medium","gaps":["Reconciliation with deubiquitinase activity unclear","Whether USP12/46 are involved not tested","Generality across ERAD substrates unknown"]},{"year":2018,"claim":"Established WDR20 as a spatial regulator of the complex, controlling plasma-membrane recruitment and CRM1-dependent nucleocytoplasmic shuttling via defined export motifs.","evidence":"Live-cell/confocal microscopy, site-directed mutagenesis of NES/N-terminal motifs, CRM1 inhibition, and fractionation","pmids":["30466959"],"confidence":"High","gaps":["Functional consequence of shuttling for specific substrates unresolved","Signals triggering relocalization unknown","Differential handling of USP12 vs USP46 unexplained"]},{"year":2021,"claim":"Refined the neuronal mechanism, showing WDR20 controls activity-regulated local insertion of AMPA receptors at the cell surface and homeostatic plasticity.","evidence":"C. elegans live imaging of GLR-1 surface levels and insertion rates with usp-46 epistasis and transcriptional readouts","pmids":["33622778"],"confidence":"High","gaps":["Pathway from glutamate signaling to wdr-20 transcription undefined","Mammalian relevance untested"]},{"year":2021,"claim":"Identified a paralog (DMWD) that competes for the same USP12 interface and differentially affects localization, indicating combinatorial control of the complex.","evidence":"Co-IP, in vitro DUB assays, localization microscopy, and phylogenetic analysis","pmids":["33844468"],"confidence":"Medium","gaps":["Whether WDR20 and DMWD binding is truly mutually exclusive not directly shown","Context determining which paralog binds unknown"]},{"year":2024,"claim":"Demonstrated a therapeutically relevant axis: WDR20 stabilizes c-Myc through USP12/46 deubiquitination, and its loss drives senescence and tumor suppression in HCC.","evidence":"siRNA screen, multiple in vivo HCC models, Co-IP/ubiquitination assays, patient-derived organoids, and tissue microarrays","pmids":["39432777"],"confidence":"High","gaps":["Whether c-Myc is a direct DUB substrate vs indirect not fully resolved","Tumor-type specificity vs RCC suppressor role not reconciled"]},{"year":null,"claim":"How WDR20's distinct functions — DUB activation, complex localization, and ERAD adaptor role — are coordinated and substrate-selected in a given cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking DUB-dependent and ERAD-adaptor functions","Substrate-targeting determinants unknown","Context dictating tumor-suppressor vs pro-tumor roles unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2,8]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,6,9]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[6]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,6]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[4,5,9]}],"complexes":["USP12·UAF1·WDR20","USP46·UAF1·WDR20"],"partners":["USP12","USP46","UAF1","P97","HRD1","GP78","DMWD"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8TBZ3","full_name":"WD repeat-containing protein 20","aliases":["Protein DMR"],"length_aa":569,"mass_kda":62.9,"function":"Regulator of deubiquitinating complexes. Activates deubiquitinating activity of complexes containing USP12 (PubMed:20147737, PubMed:27373336). Anchors at the base of the ubiquitin-contacting loop of USP12 and remotely modulates the catalytic center of the enzyme (PubMed:27373336). Regulates shuttling of the USP12 deubiquitinase complex between the plasma membrane, cytoplasm and nucleus (PubMed:30466959)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q8TBZ3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WDR20","classification":"Not Classified","n_dependent_lines":16,"n_total_lines":1208,"dependency_fraction":0.013245033112582781},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"SNRPF","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/WDR20","total_profiled":1310},"omim":[{"mim_id":"617741","title":"WD REPEAT-CONTAINING PROTEIN 20; WDR20","url":"https://www.omim.org/entry/617741"},{"mim_id":"612167","title":"WD REPEAT-CONTAINING PROTEIN 48; WDR48","url":"https://www.omim.org/entry/612167"},{"mim_id":"603091","title":"UBIQUITIN-SPECIFIC PROTEASE 12; USP12","url":"https://www.omim.org/entry/603091"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/WDR20"},"hgnc":{"alias_symbol":["DMR","MGC33177","FLJ33659","Bun107"],"prev_symbol":[]},"alphafold":{"accession":"Q8TBZ3","domains":[{"cath_id":"2.130.10.10","chopping":"231-319_363-391_513-530","consensus_level":"medium","plddt":95.8924,"start":231,"end":530}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TBZ3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TBZ3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TBZ3-F1-predicted_aligned_error_v6.png","plddt_mean":77.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WDR20","jax_strain_url":"https://www.jax.org/strain/search?query=WDR20"},"sequence":{"accession":"Q8TBZ3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TBZ3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TBZ3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TBZ3"}},"corpus_meta":[{"pmid":"15314640","id":"PMC_15314640","title":"Microdeletions 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WDR20 associates exclusively with USP12 and USP46, not with USP1. A ternary USP12·UAF1·WDR20 complex was purified, and WDR20 stimulated the enzymatic activity of USP12·UAF1 but not USP1·UAF1. siRNA-mediated depletion of WDR20 did not affect the Fanconi anemia pathway or DNA damage responses.\",\n      \"method\": \"Co-immunoprecipitation, affinity pulldown, in vitro DUB activity assay, siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — reciprocal Co-IP, purified ternary complex, in vitro enzymatic assay with multiple substrates tested, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20147737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structures of USP12 in complex with UAF1 and WDR20 revealed that UAF1 and WDR20 interact with USP12 at two distinct sites far from its catalytic center. UAF1 docks at the distal end of the USP12 Fingers domain and induces a cascade of structural changes reaching a ubiquitin-contacting loop adjacent to the catalytic cleft. WDR20 anchors at the base of this loop and remotely modulates the catalytic center. Neither cofactor increases substrate affinity; instead they potentiate USP12 through distinct allosteric mechanisms.\",\n      \"method\": \"X-ray crystallography, in vitro biochemical assays, structural mutagenesis analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional biochemical validation, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"27373336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"C. elegans WDR-20 (ortholog of WDR20) binds and stimulates the catalytic activity of USP-46 in vitro. Overexpression of WDR-20 in vivo increases GLR-1 glutamate receptor abundance in the ventral nerve cord, correlating with decreased ubiquitin-GLR-1 conjugates, indicating WDR-20 promotes deubiquitination and stabilization of GLR-1. Loss-of-function wdr-20 mutants show locomotion defects consistent with decreased glutamatergic signaling, and the locomotion effect of WDR-20/WDR-48 overexpression is blocked in usp-46 loss-of-function mutants.\",\n      \"method\": \"In vitro DUB activity assay, C. elegans genetics (overexpression, loss-of-function mutants), ubiquitin conjugate immunoblotting, behavioral assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro biochemical assay combined with in vivo genetic epistasis and biochemical readout of ubiquitination, multiple orthogonal methods\",\n      \"pmids\": [\"24356955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"WDR20 promotes recruitment of USP12 to the plasma membrane and regulates dynamic shuttling of the USP12/UAF1/WDR20 complex between the plasma membrane, cytoplasm, and nucleus. This shuttling is mediated by CRM1-dependent nuclear export and requires a short N-terminal motif (1MEIL4) in USP12 and a novel nuclear export sequence (450MDGAIASGVSKFATLSLHD468) in WDR20. WDR20 promotes plasma membrane recruitment of USP12 but not USP46. Site-directed mutagenesis of these sequences abolished the relevant localizations.\",\n      \"method\": \"Confocal and live-cell microscopy, site-directed mutagenesis, CRM1 inhibitor treatment, subcellular fractionation\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional mutagenesis, multiple mutants tested, pharmacological validation, single lab\",\n      \"pmids\": [\"30466959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"WDR20 and UAF1 (Uaf-1) are required for USP12 stabilization in prostate cancer cells. Individual silencing of either UAF1 or WDR20 is sufficient to abrogate USP12 complex activity, down-regulate androgen receptor (AR)-mediated transcription via AR destabilization, and result in increased apoptosis and decreased colony-forming ability of prostate cancer cells. USP12/UAF1/WDR20 complex presence was confirmed in prostate cancer cells by co-immunoprecipitation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA silencing, AR transcriptional reporter assays, apoptosis assays, colony formation assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal Co-IP confirmed complex, functional knockdown with multiple readouts, single lab\",\n      \"pmids\": [\"26462181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"WDR20 downregulation due to 14q copy number loss is associated with malignant transformation in clear cell renal cell carcinoma. Exogenous WDR20 expression significantly inhibited growth of RCC cell lines and induced apoptosis. WDR20 overexpression clearly reduced phosphorylation levels of ERK and AKT in RCC cells.\",\n      \"method\": \"Exogenous WDR20 expression in RCC cell lines, proliferation assays, apoptosis assays, phospho-ERK and phospho-AKT immunoblotting\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional overexpression with defined signaling readouts, single lab, no direct mechanistic link to DUB complex established in this study\",\n      \"pmids\": [\"26790128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"WDR20 is a novel regulator of endoplasmic reticulum-associated degradation (ERAD). WDR20 depletion inhibits degradation of TCRα (an ERAD substrate), while WDR20 overexpression reduces TCRα protein level. WDR20 associates with TCRα, p97, GP78, and HRD1. A portion of WDR20 localizes to the ER-containing microsomal membrane. WDR20 increases TCRα ubiquitination in an HRD1 E3 ligase-dependent manner and acts as an adaptor to mediate the interaction between p97 and TCRα.\",\n      \"method\": \"CRISPR-based screen, siRNA knockdown, WDR20 overexpression, co-immunoprecipitation, subcellular fractionation, ubiquitination assay\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — CRISPR screen followed by mechanistic follow-up with Co-IP and biochemical fractionation, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"29655804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In C. elegans, WDR-20 (ortholog of WDR20) regulates local insertion of GLR-1 AMPA receptors into the neuronal cell surface in a USP-46-dependent manner. Increased expression of WDR-20, but not WDR-48, is sufficient to increase GLR-1 surface levels dependent on USP-46. Loss of wdr-20 reduces rate of local GLR-1 insertion in neurites; overexpression of wdr-20 increases GLR-1 insertion rate. Genetic manipulations altering glutamate signaling produce reciprocal changes in wdr-20 transcription (activity-regulated expression), and homeostatic compensatory changes in surface GLR-1 levels are dependent on wdr-20.\",\n      \"method\": \"C. elegans genetics (loss-of-function mutants, overexpression), live imaging of GLR-1 surface levels and insertion rates, epistasis with usp-46 mutants\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic epistasis experiments with orthogonal live imaging and behavioral readouts, extends prior replication across labs\",\n      \"pmids\": [\"33622778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DMWD (a WDR20 paralog) binds both USP12 and USP46 and shares the same binding interface in USP12 as WDR20, suggesting their interactions with USP12 may be mutually exclusive. Both DMWD and WDR20 promote USP12 enzymatic activity, but they differentially modulate the subcellular localization of USP12. Molecular evolution analysis reveals WDR20 and DMWD arose by duplication from a common ancestor.\",\n      \"method\": \"Co-immunoprecipitation of epitope-tagged proteins, in vitro DUB activity assay, subcellular localization microscopy, phylogenetic analysis\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct Co-IP confirmed binding, in vitro activity assay, localization imaging, single lab\",\n      \"pmids\": [\"33844468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WDR20 silencing in hepatocellular carcinoma (HCC) cells selectively inhibits HCC proliferation without affecting normal hepatocytes. WDR20 knockdown induces HCC cellular senescence and suppresses tumor progression in multiple in vivo HCC models. Mechanistically, WDR20 silencing disturbs c-Myc protein stability by orchestrating simultaneous USP12/46-mediated deubiquitination of c-Myc, thereby promoting CDKN1A transcriptional activation. WDR20 and c-Myc show positive co-expression in HCC clinical samples. WDR20 silencing decreased c-Myc expression and induced senescence in patient-derived HCC organoids.\",\n      \"method\": \"siRNA library screen, siRNA knockdown, xenograft and transgenic HCC mouse models, hydrodynamic tail vein injection model, co-immunoprecipitation, ubiquitination assay, patient-derived organoids, tissue microarray\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal in vivo models, biochemical mechanistic assays, patient-derived organoid validation, single lab with strong evidence\",\n      \"pmids\": [\"39432777\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WDR20 is a WD40-repeat β-propeller protein that functions as a stimulatory/regulatory subunit of the USP12·UAF1·WDR20 (and USP46·UAF1·WDR20) ternary deubiquitinase complex: it allosterically activates USP12 catalytic activity by anchoring at the base of a ubiquitin-contacting loop and remotely modulating the catalytic center, promotes CRM1-dependent shuttling of the complex between the plasma membrane, cytoplasm, and nucleus (via a nuclear export sequence in WDR20 and an N-terminal motif in USP12), and in neurons drives deubiquitination and surface stabilization of AMPA/glutamate receptors; additionally, WDR20 has been shown to act as an ERAD adaptor linking p97 to substrates via HRD1, and its regulation of USP12/46-mediated deubiquitination of c-Myc prevents HCC cellular senescence.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"WDR20 is a WD40-repeat protein that functions as a regulatory subunit of the USP12·UAF1 and USP46·UAF1 deubiquitinase complexes, binding selectively to USP12 and USP46 (but not USP1) and stimulating their catalytic activity [#0]. Structural analysis shows that WDR20 and UAF1 dock at two distinct sites far from the USP12 catalytic center: WDR20 anchors at the base of a ubiquitin-contacting loop adjacent to the catalytic cleft and allosterically potentiates the enzyme without increasing substrate affinity [#1]. Beyond activation, WDR20 controls the subcellular distribution of the complex, recruiting USP12 to the plasma membrane and driving CRM1-dependent shuttling between membrane, cytoplasm, and nucleus via a nuclear export sequence in WDR20 and an N-terminal motif in USP12 [#3]. Through this DUB-stimulatory role WDR20 deubiquitinates and stabilizes specific substrates: in neurons it promotes deubiquitination, surface insertion, and stabilization of GLR-1/AMPA-type glutamate receptors in a USP-46-dependent, activity-regulated manner [#2, #7], and in hepatocellular carcinoma it orchestrates USP12/46-mediated deubiquitination of c-Myc, so that its loss destabilizes c-Myc, activates CDKN1A, and triggers cellular senescence [#9]. WDR20 supports the viability and proliferation of multiple cancers, stabilizing the androgen receptor in prostate cancer [#4] and acting as a tumor suppressor whose loss promotes malignant transformation in renal cell carcinoma [#5]. Independently of its DUB role, WDR20 also acts as an ERAD adaptor that links p97 to substrates and promotes HRD1-dependent ubiquitination and degradation of TCRα [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Established WDR20 as a dedicated, selective subunit of the USP12/USP46 deubiquitinase complexes rather than a general DUB cofactor, defining its core biochemical identity.\",\n      \"evidence\": \"Co-IP, affinity purification of a ternary complex, and in vitro DUB assays in human cells\",\n      \"pmids\": [\"20147737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of activation not resolved\", \"Physiological substrates not identified\", \"No role in the Fanconi anemia/USP1 pathway\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined a physiological substrate axis by showing the WDR20 ortholog stimulates USP-46 to deubiquitinate and stabilize glutamate receptors, linking the complex to neuronal signaling.\",\n      \"evidence\": \"In vitro DUB assay plus C. elegans genetics, ubiquitin-conjugate immunoblotting, and behavioral epistasis with usp-46\",\n      \"pmids\": [\"24356955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of GLR-1 selectivity unknown\", \"Conservation in mammalian neurons not tested\", \"Direct vs indirect deubiquitination not distinguished\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed WDR20 is required for USP12 complex activity and stability in cancer, coupling it to androgen receptor signaling and cell survival.\",\n      \"evidence\": \"Co-IP, siRNA silencing, AR reporter, apoptosis and colony assays in prostate cancer cells\",\n      \"pmids\": [\"26462181\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether AR is a direct DUB substrate not established\", \"Single cell-type context\", \"No in vivo validation\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved the structural mechanism, showing WDR20 activates USP12 allosterically from a remote site adjacent to the catalytic cleft rather than by enhancing substrate binding.\",\n      \"evidence\": \"X-ray crystallography of USP12·UAF1·WDR20 with structural mutagenesis and biochemical validation\",\n      \"pmids\": [\"27373336\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures of substrate-bound states absent\", \"How allostery translates to specific substrates unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Implicated WDR20 as a growth-suppressive gene lost in renal cancer, linking its downregulation to ERK/AKT signaling.\",\n      \"evidence\": \"Exogenous WDR20 expression in RCC lines with proliferation, apoptosis, and phospho-ERK/AKT immunoblotting\",\n      \"pmids\": [\"26790128\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mechanistic link to the DUB complex in this context\", \"Direct effectors of ERK/AKT modulation unknown\", \"Tumor-suppressor role conflicts with pro-survival roles elsewhere\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Uncovered a DUB-independent function: WDR20 acts as an ERAD adaptor bridging p97 to substrates and promoting HRD1-dependent degradation.\",\n      \"evidence\": \"CRISPR screen, siRNA/overexpression, Co-IP with p97/GP78/HRD1, fractionation, and ubiquitination assays on TCRα\",\n      \"pmids\": [\"29655804\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation with deubiquitinase activity unclear\", \"Whether USP12/46 are involved not tested\", \"Generality across ERAD substrates unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established WDR20 as a spatial regulator of the complex, controlling plasma-membrane recruitment and CRM1-dependent nucleocytoplasmic shuttling via defined export motifs.\",\n      \"evidence\": \"Live-cell/confocal microscopy, site-directed mutagenesis of NES/N-terminal motifs, CRM1 inhibition, and fractionation\",\n      \"pmids\": [\"30466959\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of shuttling for specific substrates unresolved\", \"Signals triggering relocalization unknown\", \"Differential handling of USP12 vs USP46 unexplained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Refined the neuronal mechanism, showing WDR20 controls activity-regulated local insertion of AMPA receptors at the cell surface and homeostatic plasticity.\",\n      \"evidence\": \"C. elegans live imaging of GLR-1 surface levels and insertion rates with usp-46 epistasis and transcriptional readouts\",\n      \"pmids\": [\"33622778\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Pathway from glutamate signaling to wdr-20 transcription undefined\", \"Mammalian relevance untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified a paralog (DMWD) that competes for the same USP12 interface and differentially affects localization, indicating combinatorial control of the complex.\",\n      \"evidence\": \"Co-IP, in vitro DUB assays, localization microscopy, and phylogenetic analysis\",\n      \"pmids\": [\"33844468\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether WDR20 and DMWD binding is truly mutually exclusive not directly shown\", \"Context determining which paralog binds unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated a therapeutically relevant axis: WDR20 stabilizes c-Myc through USP12/46 deubiquitination, and its loss drives senescence and tumor suppression in HCC.\",\n      \"evidence\": \"siRNA screen, multiple in vivo HCC models, Co-IP/ubiquitination assays, patient-derived organoids, and tissue microarrays\",\n      \"pmids\": [\"39432777\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether c-Myc is a direct DUB substrate vs indirect not fully resolved\", \"Tumor-type specificity vs RCC suppressor role not reconciled\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How WDR20's distinct functions — DUB activation, complex localization, and ERAD adaptor role — are coordinated and substrate-selected in a given cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking DUB-dependent and ERAD-adaptor functions\", \"Substrate-targeting determinants unknown\", \"Context dictating tumor-suppressor vs pro-tumor roles unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2, 8]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 6, 9]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [4, 5, 9]}\n    ],\n    \"complexes\": [\"USP12·UAF1·WDR20\", \"USP46·UAF1·WDR20\"],\n    \"partners\": [\"USP12\", \"USP46\", \"UAF1\", \"p97\", \"HRD1\", \"GP78\", \"DMWD\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}