{"gene":"USP12","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2010,"finding":"USP12 deubiquitinates histone H2A and H2B, preferring nucleosomal substrates. WDR48 (UAF1) interacts with USP12 and is required for its histone deubiquitination activity in vitro and in vivo.","method":"In vitro deubiquitination assay with nucleosomal substrates, co-immunoprecipitation, Xenopus knockdown/overexpression with chromatin immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro enzymatic assay with nucleosomal substrates combined with in vivo ChIP and genetic knockdown, replicated across multiple methods in one study","pmids":["21183687"],"is_preprint":false},{"year":2010,"finding":"WDR20, a WD40-repeat protein, forms a ternary complex with USP12 and UAF1 (WDR48) and stimulates the enzymatic activity of the USP12×UAF1 complex but not of USP1×UAF1.","method":"Co-immunoprecipitation, tandem affinity purification of ternary complex, in vitro DUB activity assay, siRNA depletion","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — purification of ternary complex combined with in vitro enzymatic activity assay, multiple orthogonal methods in one study","pmids":["20147737"],"is_preprint":false},{"year":2012,"finding":"USP12, together with its activator UAF1, deubiquitinates the non-activated form of Notch receptor in cell culture and in vitro, promoting Notch trafficking to lysosomes for degradation; USP12 silencing interrupts Notch lysosomal trafficking, increases receptor at the cell surface and elevates Notch signaling.","method":"shRNA library screen, in vitro deubiquitination assay, cell-based Notch trafficking assay, Drosophila homolog genetic validation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro DUB assay plus cell-based trafficking readout plus genetic validation in Drosophila homolog, multiple orthogonal methods","pmids":["22778262"],"is_preprint":false},{"year":2013,"finding":"USP12 in complex with UAF1 and WDR20 deubiquitinates the androgen receptor (AR), enhancing AR protein stability and transcriptional activity in prostate cancer cells.","method":"siRNA screen, co-immunoprecipitation, ubiquitination assay, AR stability and transcription reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — reciprocal Co-IP and ubiquitination assay from single lab with multiple readouts but no in vitro reconstitution","pmids":["24056413"],"is_preprint":false},{"year":2013,"finding":"The WDR48·USP12 complex deubiquitinates PHLPP1 (PH domain leucine-rich repeat protein phosphatase 1), thereby stabilizing PHLPP1 and negatively regulating Akt activation.","method":"Tandem affinity purification, co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown with Akt activity readout","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — TAP identification plus deubiquitination assay in cells, single lab","pmids":["24145035"],"is_preprint":false},{"year":2014,"finding":"USP12 in complex with UAF1 and WDR20 directly deubiquitinates and stabilizes the Akt phosphatases PHLPP and PHLPPL, leading to decreased pAkt levels, down-regulation of AR Ser213 phosphorylation, and enhanced AR stability and transcriptional activity.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, phospho-Akt and phospho-AR immunoblotting","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP, ubiquitination assay, and downstream signaling readouts from single lab","pmids":["25216524"],"is_preprint":false},{"year":2015,"finding":"USP12 regulates cell cycle progression in HeLa cells; knockdown causes G1 arrest and decreases BMI-1, c-Myc, and cyclin D2 transcript levels; catalytically inactive C48S mutant abolishes these effects, confirming dependence on deubiquitinase activity.","method":"siRNA knockdown, overexpression of WT and catalytically inactive/gain-of-function mutants, flow cytometry cell cycle analysis, qPCR","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — active-site mutagenesis confirms enzymatic dependence, single lab","pmids":["26680102"],"is_preprint":false},{"year":2015,"finding":"EBNA3A and EBNA3B viral proteins associate with a deubiquitination complex containing WDR48, WDR20, and USP46 (or its paralog USP12); WDR48 is recruited to the p14(ARF) promoter in an EBNA3C-dependent manner, implicating the USP12/46 complex in EBV-mediated gene regulation.","method":"Tandem affinity purification, mass spectrometry, co-immunoprecipitation, chromatin immunoprecipitation","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — TAP/MS identification confirmed by Co-IP and ChIP, but USP12 and USP46 are not distinguished; single lab","pmids":["25855980"],"is_preprint":false},{"year":2016,"finding":"Crystal structure of USP12-Ub/UAF1 complex at 2.8 Å resolution reveals two UAF1 binding sites on USP12 (1:2 stoichiometry, affinities ~4 nM and ~325 nM). Mutagenesis of the fingers subdomain shows the high-affinity interface is required for UAF1-mediated activation; the second binding site does not affect activation.","method":"X-ray crystallography, isothermal titration calorimetry, site-directed mutagenesis, in vitro DUB activity assay","journal":"Journal of structural biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and in vitro activity assay, multiple orthogonal methods in one study","pmids":["27650958"],"is_preprint":false},{"year":2016,"finding":"TCR stimulation induces phosphorylation of Usp12 and its time-dependent translocation from nucleus to cytosol. Usp12 deubiquitylates LAT and Trat1, preventing their lysosomal degradation, thereby maintaining the proximal TCR complex and enabling NFκB, NFAT, and MAPK signaling.","method":"Activity-based probe labeling (HA-Ub-VME) in primary T cells, Usp12-/- Jurkat cells, proximity-based BirA labeling, surface TCR flow cytometry, rescue experiments with WT Usp12","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout cells with phenotypic rescue, activity-based probe capture, proximity labeling, and substrate identification by multiple orthogonal methods","pmids":["26811477"],"is_preprint":false},{"year":2017,"finding":"USP12 is required for LPS-induced NF-κB pathway activation in macrophages; USP12 knockdown reduces inhibitory phosphorylation of IκBα and attenuates LPS-induced iNOS and IL-6 expression, as well as ERK1/2 and p38 phosphorylation.","method":"siRNA knockdown in RAW 264.7 macrophages, qPCR, western blot for IκBα phosphorylation and MAPK activation","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single method (knockdown + immunoblot), single lab, no direct substrate identification","pmids":["28063927"],"is_preprint":false},{"year":2018,"finding":"USP12 deubiquitinates MDM2 and AR, controlling the levels of both p53 and AR in prostate cancer; USP12 regulation of this TP53-MDM2-AR-AKT signalling network was established by denaturing immunoprecipitations and transcriptome analysis.","method":"Denaturing co-immunoprecipitation, transcriptome analysis, immunopathology","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — denaturing IP to confirm direct deubiquitination combined with transcriptome analysis, single lab","pmids":["29755129"],"is_preprint":false},{"year":2018,"finding":"WDR20 promotes recruitment of USP12 (but not USP46) to the plasma membrane; the USP12/UAF1/WDR20 complex shuttles between plasma membrane, cytoplasm, and nucleus via CRM1-dependent nuclear export. This requires a short N-terminal motif (1MEIL4) in USP12 and a nuclear export sequence in WDR20.","method":"Confocal and live microscopy of epitope-tagged proteins, site-directed mutagenesis, CRM1 inhibitor (leptomycin B) treatment","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — live imaging combined with mutagenesis and pharmacological inhibition, single lab, functional consequence of localization not directly demonstrated","pmids":["30466959"],"is_preprint":false},{"year":2020,"finding":"USP12 translocates from the cytoplasm to the nucleus upon IFN stimulation. In the nucleus, USP12 inhibits CBP acetyltransferase activity by interacting with CBP's HAT domain, blocking CBP-mediated acetylation of phospho-STAT1 and thereby inhibiting TCPTP-mediated dephosphorylation of p-STAT1, sustaining nuclear p-STAT1 and IFN antiviral efficacy. This function is independent of USP12's deubiquitinase activity.","method":"Co-immunoprecipitation (USP12–CBP interaction at HAT domain), subcellular fractionation/immunofluorescence for translocation, acetyltransferase activity assay, p-STAT1 immunoblotting, antiviral assays","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP mapping to HAT domain plus enzymatic activity assay and signaling readouts, single lab, deubiquitinase-independence not confirmed by mutagenesis shown in abstract","pmids":["31899788"],"is_preprint":false},{"year":2021,"finding":"USP12 mechanistically promotes lung tumour growth and immunosuppression through insufficient deubiquitination of PPM1B, leading to NF-κB hyperactivation in tumour cells and a pro-tumorigenic secretome.","method":"KrasG12D mouse model, USP12 knockdown/overexpression, ubiquitination assay for PPM1B, NF-κB reporter/immunoblot, immune microenvironment analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — mechanistic link via PPM1B deubiquitination demonstrated with in vivo mouse model, single lab","pmids":["34381028"],"is_preprint":false},{"year":2021,"finding":"USP12 interacts with, deubiquitylates, and stabilizes HMGB1, promoting HMGB1-mediated pro-survival autophagy in multiple myeloma and contributing to bortezomib resistance.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, autophagy flux assays, bortezomib sensitivity assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP and ubiquitination assay establishing substrate relationship, single lab","pmids":["34997217"],"is_preprint":false},{"year":2021,"finding":"USP12 binds and stabilizes p300 by deubiquitination, thereby activating transcription of METTL3 and promoting pathological cardiac hypertrophy.","method":"Co-immunoprecipitation, ubiquitination assay, USP12 knockdown/overexpression in NRCMs, in vivo Ang II mouse model","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP and ubiquitination assay with in vivo validation, single lab","pmids":["34339675"],"is_preprint":false},{"year":2021,"finding":"USP12 stabilizes BCL10 by deubiquitination, thereby activating NF-κB signaling in CD4+ T cells to promote their activation, differentiation, and proliferation; this mechanism is not observed in CD8+ T cells.","method":"USP12-deficient mice, Co-immunoprecipitation, ubiquitination assay, NF-κB reporter, T cell differentiation/proliferation assays","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — knockout mouse with Co-IP and ubiquitination assay establishing BCL10 as substrate, single lab","pmids":["33941870"],"is_preprint":false},{"year":2021,"finding":"USP12 deubiquitinates and stabilizes midkine (MDK); overexpression of MDK rescues the loss of angiogenesis caused by USP12 knockdown, establishing MDK as a functionally relevant USP12 substrate in breast cancer angiogenesis.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, MDK rescue experiments, HUVEC tube formation and migration assays, in vivo orthotopic model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP and ubiquitination assay with functional rescue by substrate overexpression, single lab","pmids":["34759262"],"is_preprint":false},{"year":2021,"finding":"DMWD (dystrophia myotonica WD repeat protein) binds USP12 and USP46 at the same interface as WDR20, with mutually exclusive binding. Like WDR20, DMWD promotes USP12 enzymatic activity, but DMWD and WDR20 differentially modulate subcellular localization of USP12.","method":"Direct co-immunoprecipitation of epitope-tagged proteins, in vitro DUB activity assay, subcellular localization microscopy, phylogenetic/molecular evolution analysis","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP and in vitro activity assay with localization readout, single lab","pmids":["33844468"],"is_preprint":false},{"year":2022,"finding":"USP12 deubiquitinates and stabilizes p65 (NF-κB subunit) in monocytic MDSCs, sustaining expression of iNOS and PD-L1 and thereby promoting MDSC immunosuppressive function.","method":"USP12-knockout mice, co-immunoprecipitation, ubiquitination assay, flow cytometry for iNOS/PD-L1, CD8+ T cell suppression assay","journal":"Immunology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — knockout mice with Co-IP and ubiquitination assay, single lab","pmids":["35898171"],"is_preprint":false},{"year":2022,"finding":"USP12 directly interacts with Bax and removes K63-linked ubiquitin chains from Bax (at K128 and K190), affecting Bax half-life but not proteasomal degradation.","method":"Yeast two-hybrid screening, co-immunoprecipitation, site-directed mutagenesis of Bax ubiquitination sites (K128R, K189R, K190R), protein half-life assay","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Y2H plus mutagenesis and half-life assay, single lab","pmids":["36361894"],"is_preprint":false},{"year":2023,"finding":"USP12 directly interacts with and deubiquitinates RRM2 (ribonucleotide reductase subunit M2) in non-small cell lung cancer cells, stabilizing RRM2 protein levels; USP12 knockdown causes DNA replication stress.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, DNA replication stress assay, in vivo tumor growth assay","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP and ubiquitination assay establishing direct substrate relationship, single lab","pmids":["37341611"],"is_preprint":false},{"year":2023,"finding":"USP12 deubiquitinates and stabilizes IFI16, preventing its proteasomal degradation and thereby sustaining IFI16-STING-IRF3 and p65-mediated antiviral signaling in response to HSV-1.","method":"USP12 knockout/knockdown, co-immunoprecipitation, ubiquitination assay, IFN-β/ISG expression, viral replication assay","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — knockout plus Co-IP and ubiquitination assay with antiviral functional readout, single lab","pmids":["37410794"],"is_preprint":false},{"year":2024,"finding":"WDR20 facilitates simultaneous USP12/46-mediated deubiquitination of c-Myc, maintaining c-Myc protein stability and preventing HCC cellular senescence; WDR20 silencing destabilizes c-Myc and promotes CDKN1A transcription.","method":"siRNA screen, co-immunoprecipitation, ubiquitination assay, HCC xenograft/transgenic mouse models, patient-derived organoids","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP and ubiquitination assay with multiple in vivo model validation, but USP12 and USP46 not distinguished; single lab","pmids":["39432777"],"is_preprint":false},{"year":2024,"finding":"USP12 deubiquitinates YAP, specifically inhibiting K48-linked poly-ubiquitination at K315, thereby stabilizing YAP and promoting gastric cancer progression via the Hippo/YAP axis; USP12 localizes to the nucleus and co-immunoprecipitates with YAP.","method":"DUB siRNA library screen, co-immunoprecipitation, immunostaining for nuclear localization, ubiquitination assay with K315 site mutagenesis, siRNA knockdown and overexpression with YAP activity readouts","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP, site-specific mutagenesis, and functional rescue, single lab","pmids":["38605077"],"is_preprint":false},{"year":2024,"finding":"USP12 deubiquitinates FOXO3, preventing its ubiquitin-mediated degradation; elevated USP12 (stabilized by METTL3/YTHDF1-dependent m6A modification) enhances FOXO3 binding to the PUMA promoter, activating intrinsic apoptosis in sepsis-induced myocardial dysfunction.","method":"Proteomic profiling in LPS-induced mouse model, co-immunoprecipitation, ubiquitination assay, METTL3/YTHDF1 inhibitor experiments, in vitro and in vivo loss-of-function","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP and ubiquitination assay with in vivo validation and upstream regulatory mechanism identified, single lab","pmids":["39662205"],"is_preprint":false}],"current_model":"USP12 is a deubiquitinating enzyme that functions as a catalytic subunit within a ternary complex with the scaffold/activator UAF1 (WDR48) and the stimulatory subunit WDR20 (or alternatively DMWD); crystal structure and mutagenesis show UAF1 binds USP12 at two sites (high-affinity fingers subdomain interface required for activation), WDR20 further stimulates activity and controls CRM1-dependent nucleocytoplasmic shuttling of the complex, and the enzyme acts on a broad range of substrates—including histones H2A/H2B, AR, MDM2, Notch, PHLPP1/2, LAT, Trat1, BCL10, HMGB1, p300, IFI16, YAP, RRM2, c-Myc, p65, PPM1B, MDK, FOXO3, and Bax—to regulate gene expression, cell proliferation and survival, T cell and innate immune signaling, and viral defense; additionally, USP12 inhibits CBP acetyltransferase activity independently of its deubiquitinase function during interferon signaling."},"narrative":{"mechanistic_narrative":"USP12 is a deubiquitinating enzyme that functions as the catalytic subunit of a ternary complex with the WD40-repeat scaffold UAF1 (WDR48) and the activating subunit WDR20, controlling the stability and trafficking of a broad range of substrates to regulate gene expression, cell proliferation, immune signaling, and antiviral defense [PMID:21183687, PMID:20147737]. UAF1 binds USP12 at two sites with 1:2 stoichiometry, and engagement of the high-affinity fingers-subdomain interface is required for activation, while WDR20 further stimulates catalysis and, together with UAF1, governs CRM1-dependent shuttling of the complex between plasma membrane, cytoplasm, and nucleus via an N-terminal motif in USP12 and an export sequence in WDR20 [PMID:20147737, PMID:27650958, PMID:30466959]; the paralog-related protein DMWD binds the same interface as WDR20 in a mutually exclusive manner and likewise activates the enzyme while differentially tuning its localization [PMID:33844468]. Through nucleosomal deubiquitination of histones H2A/H2B and removal of degradative or trafficking-directed ubiquitin marks, USP12 stabilizes diverse substrates including the androgen receptor, MDM2, PHLPP1/2, BCL10, p65, p300, c-Myc, YAP, RRM2, IFI16, HMGB1, midkine, FOXO3 and Bax, and promotes Notch lysosomal degradation [PMID:21183687, PMID:22778262, PMID:24056413, PMID:24145035, PMID:29755129, PMID:33941870, PMID:35898171, PMID:37341611, PMID:37410794, PMID:38605077]. In T-cell receptor signaling, USP12 deubiquitinates LAT and Trat1 to preserve the proximal TCR complex and downstream NF-κB, NFAT, and MAPK activation [PMID:26811477], and it potentiates innate and antiviral responses by stabilizing NF-κB and STING-pathway components [PMID:34381028, PMID:35898171, PMID:37410794]. Independently of its catalytic activity, nuclear USP12 binds the CBP HAT domain to inhibit CBP-mediated acetylation of phospho-STAT1, sustaining nuclear p-STAT1 during interferon signaling [PMID:31899788].","teleology":[{"year":2010,"claim":"Established that USP12 is a chromatin-directed deubiquitinase whose activity depends on an obligate partner, defining the molecular logic of substrate engagement.","evidence":"In vitro deubiquitination of nucleosomal H2A/H2B plus Xenopus knockdown and ChIP, with UAF1 co-IP showing the partner is required for activity","pmids":["21183687"],"confidence":"High","gaps":["Did not define how UAF1 binding activates the catalytic domain","Range of physiological histone-modified loci not mapped"]},{"year":2010,"claim":"Identified WDR20 as a third, USP12-selective subunit, establishing the ternary architecture and showing activation is partner-specific rather than generic.","evidence":"Tandem affinity purification of the ternary complex, in vitro DUB activity assay, and siRNA depletion comparing USP12 vs USP1 complexes","pmids":["20147737"],"confidence":"High","gaps":["Structural basis of WDR20 stimulation not resolved","Whether WDR20 alters substrate selection unknown"]},{"year":2012,"claim":"Showed USP12 acts on a membrane-receptor substrate to direct its trafficking fate, extending its role beyond chromatin into receptor degradation control.","evidence":"shRNA screen, in vitro DUB assay, cell-based Notch trafficking, and Drosophila homolog genetic validation","pmids":["22778262"],"confidence":"High","gaps":["Ubiquitin linkage type on Notch not defined","How USP12 is targeted to endosomal Notch unknown"]},{"year":2013,"claim":"Linked USP12 to oncogenic signaling by showing it stabilizes the androgen receptor and the Akt phosphatase PHLPP1, positioning it as a node controlling proliferation and survival signaling.","evidence":"siRNA/TAP, co-IP, in vivo ubiquitination assays, AR transcription reporters, and Akt activity readouts","pmids":["24056413","24145035"],"confidence":"Medium","gaps":["No in vitro reconstitution of AR or PHLPP1 deubiquitination","Single lab"]},{"year":2014,"claim":"Integrated the AR and PHLPP findings into a single circuit, showing USP12 dampens Akt to indirectly stabilize and activate AR.","evidence":"Co-IP, ubiquitination assays, and phospho-Akt/phospho-AR immunoblotting in prostate cancer cells","pmids":["25216524"],"confidence":"Medium","gaps":["Direct vs indirect contributions to AR stability not separated","Single lab"]},{"year":2015,"claim":"Demonstrated that USP12's proliferative role requires catalytic activity, ruling out a purely scaffolding contribution to cell-cycle control.","evidence":"siRNA knockdown plus catalytically inactive C48S mutant, flow cytometry cell-cycle analysis, and qPCR of BMI-1/c-Myc/cyclin D2","pmids":["26680102"],"confidence":"Medium","gaps":["Direct substrates driving G1 arrest not identified","Effects on transcript levels mechanistically unexplained"]},{"year":2016,"claim":"Provided the structural mechanism of activation, showing two UAF1 sites of distinct affinity and that only the high-affinity fingers interface drives catalysis.","evidence":"2.8 Å crystal structure of USP12-Ub/UAF1, ITC, site-directed mutagenesis, and in vitro DUB activity assay","pmids":["27650958"],"confidence":"High","gaps":["WDR20 not included in the structure","Function of the second, low-affinity UAF1 site unknown"]},{"year":2016,"claim":"Defined USP12 as a positive regulator of T-cell receptor signaling by identifying LAT and Trat1 as substrates protected from lysosomal degradation.","evidence":"Activity-based probe labeling in primary T cells, USP12-/- Jurkat cells with WT rescue, proximity BirA labeling, and surface TCR flow cytometry","pmids":["26811477"],"confidence":"High","gaps":["Kinase responsible for stimulation-induced USP12 phosphorylation not identified","Ubiquitin linkage chemistry on LAT/Trat1 not defined"]},{"year":2015,"claim":"Connected the USP12/UAF1/WDR20 complex to viral transcriptional reprogramming through EBNA3 viral proteins.","evidence":"TAP/MS, co-IP, and ChIP placing WDR48 at the p14(ARF) promoter in an EBNA3C-dependent manner","pmids":["25855980"],"confidence":"Medium","gaps":["USP12 and its paralog USP46 not distinguished","Catalytic relevance to the promoter effect untested"]},{"year":2018,"claim":"Expanded the prostate-cancer circuit by showing USP12 deubiquitinates MDM2 in addition to AR, embedding it in a TP53-MDM2-AR-AKT network.","evidence":"Denaturing co-IP confirming direct deubiquitination plus transcriptome analysis and immunopathology","pmids":["29755129"],"confidence":"Medium","gaps":["Net directionality on p53 levels context-dependent","Single lab"]},{"year":2018,"claim":"Resolved the subcellular control of the complex, showing WDR20 recruits USP12 to the plasma membrane and CRM1-dependent export drives shuttling, dependent on defined motifs in USP12 and WDR20.","evidence":"Confocal/live microscopy of tagged proteins, mutagenesis of the USP12 N-terminal motif, and leptomycin B CRM1 inhibition","pmids":["30466959"],"confidence":"Medium","gaps":["Functional consequence of each localization not directly demonstrated","Import machinery not identified"]},{"year":2020,"claim":"Revealed a catalysis-independent function of USP12 in interferon signaling, where it inhibits CBP acetyltransferase to sustain nuclear phospho-STAT1.","evidence":"Co-IP mapping USP12 to the CBP HAT domain, acetyltransferase activity assay, p-STAT1 immunoblotting, and antiviral assays","pmids":["31899788"],"confidence":"Medium","gaps":["Deubiquitinase-independence not confirmed by catalytic-dead mutant in this context","Single lab"]},{"year":2021,"claim":"Established a recurring theme of USP12 stabilizing distinct substrates to control NF-κB output across immune and tumor contexts (PPM1B, BCL10, p65).","evidence":"USP12 knockout/knockdown mice, co-IP, ubiquitination assays, NF-κB reporters, and immune microenvironment/T-cell differentiation analyses","pmids":["34381028","33941870","35898171"],"confidence":"Medium","gaps":["Opposing effects on NF-κB (via PPM1B vs p65/BCL10) not mechanistically reconciled","Ubiquitin linkage specificity varies and largely undefined"]},{"year":2021,"claim":"Broadened the substrate repertoire to transcriptional, survival, and angiogenic regulators (p300, HMGB1, midkine), linking USP12 to autophagy, cardiac hypertrophy, and cancer angiogenesis.","evidence":"Co-IP, ubiquitination assays, knockdown with functional rescue, and in vivo disease models","pmids":["34339675","34997217","34759262"],"confidence":"Medium","gaps":["Direct vs complex-dependent deubiquitination not separated for each substrate","Single lab per substrate"]},{"year":2021,"claim":"Characterized DMWD as an alternative activating subunit binding the WDR20 interface in mutually exclusive fashion, indicating combinatorial control of activity and localization.","evidence":"Direct co-IP of tagged proteins, in vitro DUB activity assay, localization microscopy, and phylogenetic analysis","pmids":["33844468"],"confidence":"Medium","gaps":["Physiological contexts favoring DMWD vs WDR20 unknown","Structural basis of competition not solved"]},{"year":2022,"claim":"Showed USP12 directly removes K63-linked ubiquitin from Bax at specific lysines, affecting half-life without proteasomal degradation, implicating it in apoptotic control.","evidence":"Yeast two-hybrid, co-IP, and site-directed mutagenesis of Bax K128/K190 with half-life assays","pmids":["36361894"],"confidence":"Medium","gaps":["Cellular outcome of Bax K63 chain removal not fully defined","Single lab"]},{"year":2023,"claim":"Extended USP12 into nucleotide metabolism/replication and antiviral DNA sensing by stabilizing RRM2 and IFI16.","evidence":"Co-IP, ubiquitination assays, DNA replication stress readouts, USP12 knockout, and HSV-1 antiviral assays","pmids":["37341611","37410794"],"confidence":"Medium","gaps":["Whether the same complex composition governs both substrates untested","Single lab per substrate"]},{"year":2024,"claim":"Further generalized USP12-family deubiquitination of growth/oncogenic regulators (c-Myc, YAP, FOXO3), including site-specific control of YAP K48 chains and m6A-driven upregulation of USP12.","evidence":"DUB siRNA library screens, co-IP, site-specific ubiquitination mutagenesis (YAP K315), and in vivo HCC/gastric/sepsis models","pmids":["39432777","38605077","39662205"],"confidence":"Medium","gaps":["USP12 vs USP46 not distinguished for c-Myc","Context-determinants of substrate choice remain unclear"]},{"year":null,"claim":"How USP12 achieves substrate selectivity across such a broad, context-dependent substrate range, and what dictates the choice between WDR20- vs DMWD-bound complexes and catalytic vs non-catalytic functions, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying determinant of substrate recognition identified","Subunit-composition rules for substrate/localization choice undefined","Catalysis-independent CBP inhibition not generalized beyond IFN context"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,9,21,25]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,12,13,25]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9,12]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[12]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,17,20,23]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,16,24,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,14,25]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[6,24]}],"complexes":["USP12-UAF1(WDR48)-WDR20 deubiquitinase complex"],"partners":["WDR48","WDR20","DMWD","AR","PHLPP1","MDM2","BCL10","CREBBP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O75317","full_name":"Ubiquitin carboxyl-terminal hydrolase 12","aliases":["Deubiquitinating enzyme 12","Ubiquitin specific peptidase 12","Ubiquitin thioesterase 12","Ubiquitin-hydrolyzing enzyme 1","Ubiquitin-specific-processing protease 12"],"length_aa":370,"mass_kda":42.9,"function":"Deubiquitinating enzyme that plays various roles in the regulation of the immune response and inflammation (PubMed:19075014, PubMed:27373336). During TCR engagement and activation, translocates into the cytoplasm and deubiquitinates its substrates LAT and TRAT1 and prevents their lysosome-dependent degradation to stabilize the TCR signaling complex at the plasma membrane (PubMed:26811477). Plays an essential role in the selective LPS-induced macrophage response through the activation of NF-kappa-B pathway (PubMed:28063927). In addition, promotes that antiviral immune response through targeting DNA sensor IFI16 to inhibit its proteasome-dependent degradation (PubMed:37410794). Participates in the interferon signaling pathway and antiviral response independently of its deubiquitinase activity by maintaining nuclear phosphorylated STAT1 levels via inhibition of its CREBBP-mediated acetylation and subsequent dephosphorylation (PubMed:31899788). Plays an intrinsic role in promoting the differentiation, activation and proliferation of CD4(+) T-cell by activating the NF-kappa-B signaling pathway through deubiquitinating and stabilizing B-cell lymphoma/leukemia 10/BCL10 (By similarity). In myeloid-derived suppressor cells promotes the activation of the NF-kappa-B via deubiquitination and stabilization of RELA (By similarity). Regulates the 'Lys-63'-linked polyubiquitin chains of BAX and thereby modulates the mitochondrial apoptotic process (PubMed:36361894). Negative regulator of NOTCH signaling that specifically deubiquitinates non-activated NOTCH receptors to target them for lysosomal degradation; deubiquitination of NOTCH stimulates its transport form late endosomes to lysosomes (PubMed:22778262). Protects neurons against HTT/huntingtin-induced polyglutamine expansion-dependent neurodegeneration through regulation of autophagic flux (PubMed:30266909). This function is independent of deubiquitinase activity or of other components of the USP12-WDR20-WDR48 deubiquitinating complex (By similarity). In complex with WDR48, acts as a potential tumor suppressor by positively regulating PHLPP1 stability (PubMed:24145035) (Microbial infection) Forms a complex with Epstein-Barr virus protein EBNA3 which is an active deubiquitinase activity that may select specific substrates to promote B-lymphocyte transformation","subcellular_location":"Nucleus; Cytoplasm; Cell membrane","url":"https://www.uniprot.org/uniprotkb/O75317/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/USP12","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/USP12","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"},{"mim_id":"190198","title":"NOTCH RECEPTOR 1; NOTCH1","url":"https://www.omim.org/entry/190198"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/USP12"},"hgnc":{"alias_symbol":[],"prev_symbol":["USP12L1"]},"alphafold":{"accession":"O75317","domains":[{"cath_id":"3.90.70.10","chopping":"33-143_171-367","consensus_level":"medium","plddt":93.8771,"start":33,"end":367}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O75317","model_url":"https://alphafold.ebi.ac.uk/files/AF-O75317-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O75317-F1-predicted_aligned_error_v6.png","plddt_mean":88.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=USP12","jax_strain_url":"https://www.jax.org/strain/search?query=USP12"},"sequence":{"accession":"O75317","fasta_url":"https://rest.uniprot.org/uniprotkb/O75317.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O75317/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O75317"}},"corpus_meta":[{"pmid":"21183687","id":"PMC_21183687","title":"Regulation of histone H2A and H2B deubiquitination and Xenopus development by USP12 and USP46.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21183687","citation_count":102,"is_preprint":false},{"pmid":"20147737","id":"PMC_20147737","title":"WDR20 regulates activity of the USP12 x UAF1 deubiquitinating enzyme complex.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/20147737","citation_count":81,"is_preprint":false},{"pmid":"24056413","id":"PMC_24056413","title":"Deubiquitinating enzyme Usp12 is a novel co-activator of the androgen receptor.","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24056413","citation_count":76,"is_preprint":false},{"pmid":"24145035","id":"PMC_24145035","title":"WD repeat protein WDR48 in complex with deubiquitinase USP12 suppresses Akt-dependent cell survival signaling by stabilizing PH domain leucine-rich repeat protein phosphatase 1 (PHLPP1).","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24145035","citation_count":62,"is_preprint":false},{"pmid":"22778262","id":"PMC_22778262","title":"The ubiquitin-specific protease 12 (USP12) is a negative regulator of notch signaling acting on notch receptor trafficking toward degradation.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22778262","citation_count":60,"is_preprint":false},{"pmid":"25855980","id":"PMC_25855980","title":"The EBNA3 family of Epstein-Barr virus nuclear proteins associates with the USP46/USP12 deubiquitination complexes to regulate lymphoblastoid cell line growth.","date":"2015","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/25855980","citation_count":50,"is_preprint":false},{"pmid":"25216524","id":"PMC_25216524","title":"Deubiquitinating enzyme Usp12 regulates the interaction between the androgen receptor and the 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USP12.","date":"2018","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/29755129","citation_count":36,"is_preprint":false},{"pmid":"34997217","id":"PMC_34997217","title":"Deubiquitylase USP12 induces pro-survival autophagy and bortezomib resistance in multiple myeloma by stabilizing HMGB1.","date":"2022","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/34997217","citation_count":35,"is_preprint":false},{"pmid":"34339675","id":"PMC_34339675","title":"De-ubiquitination of p300 by USP12 Critically Enhances METTL3 Expression and Ang II-induced cardiac hypertrophy.","date":"2021","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/34339675","citation_count":32,"is_preprint":false},{"pmid":"27650958","id":"PMC_27650958","title":"A conserved two-step binding for the UAF1 regulator to the USP12 deubiquitinating enzyme.","date":"2016","source":"Journal of structural 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disease","url":"https://pubmed.ncbi.nlm.nih.gov/34759262","citation_count":21,"is_preprint":false},{"pmid":"33941870","id":"PMC_33941870","title":"USP12 promotes CD4+ T cell responses through deubiquitinating and stabilizing BCL10.","date":"2021","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/33941870","citation_count":19,"is_preprint":false},{"pmid":"26680102","id":"PMC_26680102","title":"USP12 regulates cell cycle progression by involving c-Myc, cyclin D2 and BMI-1.","date":"2015","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/26680102","citation_count":17,"is_preprint":false},{"pmid":"37410794","id":"PMC_37410794","title":"USP12 promotes antiviral responses by deubiquitinating and stabilizing IFI16.","date":"2023","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/37410794","citation_count":16,"is_preprint":false},{"pmid":"35898171","id":"PMC_35898171","title":"USP12 positively regulates M-MDSC function to inhibit antitumour immunity through deubiquitinating and stabilizing p65.","date":"2022","source":"Immunology","url":"https://pubmed.ncbi.nlm.nih.gov/35898171","citation_count":15,"is_preprint":false},{"pmid":"39432777","id":"PMC_39432777","title":"WDR20 prevents hepatocellular carcinoma senescence by orchestrating the simultaneous USP12/46-mediated deubiquitination of c-Myc.","date":"2024","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/39432777","citation_count":14,"is_preprint":false},{"pmid":"37752518","id":"PMC_37752518","title":"Spotlights on ubiquitin-specific protease 12 (USP12) in diseases: from multifaceted roles to pathophysiological mechanisms.","date":"2023","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/37752518","citation_count":13,"is_preprint":false},{"pmid":"37341611","id":"PMC_37341611","title":"USP12 promotes nonsmall cell lung cancer progression through deubiquitinating and stabilizing RRM2.","date":"2023","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/37341611","citation_count":11,"is_preprint":false},{"pmid":"36361894","id":"PMC_36361894","title":"Deubiquitinating Enzyme USP12 Regulates the Pro-Apoptosis Protein Bax.","date":"2022","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36361894","citation_count":11,"is_preprint":false},{"pmid":"28063927","id":"PMC_28063927","title":"Deubiquitinase USP12 promotes LPS induced macrophage responses through inhibition of IκBα.","date":"2017","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/28063927","citation_count":11,"is_preprint":false},{"pmid":"38113977","id":"PMC_38113977","title":"USP12 regulates ER stress-associated osteogenesis in human periodontal ligament cells under tension stress.","date":"2023","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/38113977","citation_count":10,"is_preprint":false},{"pmid":"38605077","id":"PMC_38605077","title":"USP12 facilitates gastric cancer progression via stabilizing YAP.","date":"2024","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/38605077","citation_count":10,"is_preprint":false},{"pmid":"30466959","id":"PMC_30466959","title":"WDR20 regulates shuttling of the USP12 deubiquitinase complex between the plasma membrane, cytoplasm and nucleus.","date":"2018","source":"European journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/30466959","citation_count":9,"is_preprint":false},{"pmid":"33174033","id":"PMC_33174033","title":"Downregulation of USP12 inhibits tumor growth via the p38/MAPK pathway in hepatocellular carcinoma.","date":"2020","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/33174033","citation_count":8,"is_preprint":false},{"pmid":"35032679","id":"PMC_35032679","title":"Grouper USP12 exerts antiviral activity against nodavirus infection.","date":"2022","source":"Fish & shellfish immunology","url":"https://pubmed.ncbi.nlm.nih.gov/35032679","citation_count":6,"is_preprint":false},{"pmid":"39662205","id":"PMC_39662205","title":"METTL3/YTHDF1-mediated m6A modification stabilizes USP12 to deubiquitinate FOXO3 and promote apoptosis in sepsis-induced myocardial dysfunction.","date":"2024","source":"Molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/39662205","citation_count":6,"is_preprint":false},{"pmid":"39700963","id":"PMC_39700963","title":"Membrane palmitoylated protein MPP1 inhibits immune escape by regulating the USP12/ CCL5 axis in urothelial carcinoma.","date":"2024","source":"International 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Co-occurrence","date":"2025-05-25","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.24.25328240","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":18471,"output_tokens":6362,"usd":0.075422,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15058,"output_tokens":5412,"usd":0.105295,"stage2_stop_reason":"end_turn"},"total_usd":0.180717,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2010,\n      \"finding\": \"USP12 deubiquitinates histone H2A and H2B, preferring nucleosomal substrates. WDR48 (UAF1) interacts with USP12 and is required for its histone deubiquitination activity in vitro and in vivo.\",\n      \"method\": \"In vitro deubiquitination assay with nucleosomal substrates, co-immunoprecipitation, Xenopus knockdown/overexpression with chromatin immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro enzymatic assay with nucleosomal substrates combined with in vivo ChIP and genetic knockdown, replicated across multiple methods in one study\",\n      \"pmids\": [\"21183687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"WDR20, a WD40-repeat protein, forms a ternary complex with USP12 and UAF1 (WDR48) and stimulates the enzymatic activity of the USP12×UAF1 complex but not of USP1×UAF1.\",\n      \"method\": \"Co-immunoprecipitation, tandem affinity purification of ternary complex, in vitro DUB activity assay, siRNA depletion\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — purification of ternary complex combined with in vitro enzymatic activity assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"20147737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"USP12, together with its activator UAF1, deubiquitinates the non-activated form of Notch receptor in cell culture and in vitro, promoting Notch trafficking to lysosomes for degradation; USP12 silencing interrupts Notch lysosomal trafficking, increases receptor at the cell surface and elevates Notch signaling.\",\n      \"method\": \"shRNA library screen, in vitro deubiquitination assay, cell-based Notch trafficking assay, Drosophila homolog genetic validation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro DUB assay plus cell-based trafficking readout plus genetic validation in Drosophila homolog, multiple orthogonal methods\",\n      \"pmids\": [\"22778262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"USP12 in complex with UAF1 and WDR20 deubiquitinates the androgen receptor (AR), enhancing AR protein stability and transcriptional activity in prostate cancer cells.\",\n      \"method\": \"siRNA screen, co-immunoprecipitation, ubiquitination assay, AR stability and transcription reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — reciprocal Co-IP and ubiquitination assay from single lab with multiple readouts but no in vitro reconstitution\",\n      \"pmids\": [\"24056413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The WDR48·USP12 complex deubiquitinates PHLPP1 (PH domain leucine-rich repeat protein phosphatase 1), thereby stabilizing PHLPP1 and negatively regulating Akt activation.\",\n      \"method\": \"Tandem affinity purification, co-immunoprecipitation, in vivo ubiquitination assay, siRNA knockdown with Akt activity readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — TAP identification plus deubiquitination assay in cells, single lab\",\n      \"pmids\": [\"24145035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"USP12 in complex with UAF1 and WDR20 directly deubiquitinates and stabilizes the Akt phosphatases PHLPP and PHLPPL, leading to decreased pAkt levels, down-regulation of AR Ser213 phosphorylation, and enhanced AR stability and transcriptional activity.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, phospho-Akt and phospho-AR immunoblotting\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP, ubiquitination assay, and downstream signaling readouts from single lab\",\n      \"pmids\": [\"25216524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"USP12 regulates cell cycle progression in HeLa cells; knockdown causes G1 arrest and decreases BMI-1, c-Myc, and cyclin D2 transcript levels; catalytically inactive C48S mutant abolishes these effects, confirming dependence on deubiquitinase activity.\",\n      \"method\": \"siRNA knockdown, overexpression of WT and catalytically inactive/gain-of-function mutants, flow cytometry cell cycle analysis, qPCR\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — active-site mutagenesis confirms enzymatic dependence, single lab\",\n      \"pmids\": [\"26680102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"EBNA3A and EBNA3B viral proteins associate with a deubiquitination complex containing WDR48, WDR20, and USP46 (or its paralog USP12); WDR48 is recruited to the p14(ARF) promoter in an EBNA3C-dependent manner, implicating the USP12/46 complex in EBV-mediated gene regulation.\",\n      \"method\": \"Tandem affinity purification, mass spectrometry, co-immunoprecipitation, chromatin immunoprecipitation\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — TAP/MS identification confirmed by Co-IP and ChIP, but USP12 and USP46 are not distinguished; single lab\",\n      \"pmids\": [\"25855980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structure of USP12-Ub/UAF1 complex at 2.8 Å resolution reveals two UAF1 binding sites on USP12 (1:2 stoichiometry, affinities ~4 nM and ~325 nM). Mutagenesis of the fingers subdomain shows the high-affinity interface is required for UAF1-mediated activation; the second binding site does not affect activation.\",\n      \"method\": \"X-ray crystallography, isothermal titration calorimetry, site-directed mutagenesis, in vitro DUB activity assay\",\n      \"journal\": \"Journal of structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and in vitro activity assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"27650958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TCR stimulation induces phosphorylation of Usp12 and its time-dependent translocation from nucleus to cytosol. Usp12 deubiquitylates LAT and Trat1, preventing their lysosomal degradation, thereby maintaining the proximal TCR complex and enabling NFκB, NFAT, and MAPK signaling.\",\n      \"method\": \"Activity-based probe labeling (HA-Ub-VME) in primary T cells, Usp12-/- Jurkat cells, proximity-based BirA labeling, surface TCR flow cytometry, rescue experiments with WT Usp12\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout cells with phenotypic rescue, activity-based probe capture, proximity labeling, and substrate identification by multiple orthogonal methods\",\n      \"pmids\": [\"26811477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"USP12 is required for LPS-induced NF-κB pathway activation in macrophages; USP12 knockdown reduces inhibitory phosphorylation of IκBα and attenuates LPS-induced iNOS and IL-6 expression, as well as ERK1/2 and p38 phosphorylation.\",\n      \"method\": \"siRNA knockdown in RAW 264.7 macrophages, qPCR, western blot for IκBα phosphorylation and MAPK activation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single method (knockdown + immunoblot), single lab, no direct substrate identification\",\n      \"pmids\": [\"28063927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP12 deubiquitinates MDM2 and AR, controlling the levels of both p53 and AR in prostate cancer; USP12 regulation of this TP53-MDM2-AR-AKT signalling network was established by denaturing immunoprecipitations and transcriptome analysis.\",\n      \"method\": \"Denaturing co-immunoprecipitation, transcriptome analysis, immunopathology\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — denaturing IP to confirm direct deubiquitination combined with transcriptome analysis, single lab\",\n      \"pmids\": [\"29755129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"WDR20 promotes recruitment of USP12 (but not USP46) to the plasma membrane; the USP12/UAF1/WDR20 complex shuttles between plasma membrane, cytoplasm, and nucleus via CRM1-dependent nuclear export. This requires a short N-terminal motif (1MEIL4) in USP12 and a nuclear export sequence in WDR20.\",\n      \"method\": \"Confocal and live microscopy of epitope-tagged proteins, site-directed mutagenesis, CRM1 inhibitor (leptomycin B) treatment\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — live imaging combined with mutagenesis and pharmacological inhibition, single lab, functional consequence of localization not directly demonstrated\",\n      \"pmids\": [\"30466959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP12 translocates from the cytoplasm to the nucleus upon IFN stimulation. In the nucleus, USP12 inhibits CBP acetyltransferase activity by interacting with CBP's HAT domain, blocking CBP-mediated acetylation of phospho-STAT1 and thereby inhibiting TCPTP-mediated dephosphorylation of p-STAT1, sustaining nuclear p-STAT1 and IFN antiviral efficacy. This function is independent of USP12's deubiquitinase activity.\",\n      \"method\": \"Co-immunoprecipitation (USP12–CBP interaction at HAT domain), subcellular fractionation/immunofluorescence for translocation, acetyltransferase activity assay, p-STAT1 immunoblotting, antiviral assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP mapping to HAT domain plus enzymatic activity assay and signaling readouts, single lab, deubiquitinase-independence not confirmed by mutagenesis shown in abstract\",\n      \"pmids\": [\"31899788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP12 mechanistically promotes lung tumour growth and immunosuppression through insufficient deubiquitination of PPM1B, leading to NF-κB hyperactivation in tumour cells and a pro-tumorigenic secretome.\",\n      \"method\": \"KrasG12D mouse model, USP12 knockdown/overexpression, ubiquitination assay for PPM1B, NF-κB reporter/immunoblot, immune microenvironment analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — mechanistic link via PPM1B deubiquitination demonstrated with in vivo mouse model, single lab\",\n      \"pmids\": [\"34381028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP12 interacts with, deubiquitylates, and stabilizes HMGB1, promoting HMGB1-mediated pro-survival autophagy in multiple myeloma and contributing to bortezomib resistance.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, autophagy flux assays, bortezomib sensitivity assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP and ubiquitination assay establishing substrate relationship, single lab\",\n      \"pmids\": [\"34997217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP12 binds and stabilizes p300 by deubiquitination, thereby activating transcription of METTL3 and promoting pathological cardiac hypertrophy.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, USP12 knockdown/overexpression in NRCMs, in vivo Ang II mouse model\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP and ubiquitination assay with in vivo validation, single lab\",\n      \"pmids\": [\"34339675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP12 stabilizes BCL10 by deubiquitination, thereby activating NF-κB signaling in CD4+ T cells to promote their activation, differentiation, and proliferation; this mechanism is not observed in CD8+ T cells.\",\n      \"method\": \"USP12-deficient mice, Co-immunoprecipitation, ubiquitination assay, NF-κB reporter, T cell differentiation/proliferation assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — knockout mouse with Co-IP and ubiquitination assay establishing BCL10 as substrate, single lab\",\n      \"pmids\": [\"33941870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP12 deubiquitinates and stabilizes midkine (MDK); overexpression of MDK rescues the loss of angiogenesis caused by USP12 knockdown, establishing MDK as a functionally relevant USP12 substrate in breast cancer angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, MDK rescue experiments, HUVEC tube formation and migration assays, in vivo orthotopic model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP and ubiquitination assay with functional rescue by substrate overexpression, single lab\",\n      \"pmids\": [\"34759262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DMWD (dystrophia myotonica WD repeat protein) binds USP12 and USP46 at the same interface as WDR20, with mutually exclusive binding. Like WDR20, DMWD promotes USP12 enzymatic activity, but DMWD and WDR20 differentially modulate subcellular localization of USP12.\",\n      \"method\": \"Direct co-immunoprecipitation of epitope-tagged proteins, in vitro DUB activity assay, subcellular localization microscopy, phylogenetic/molecular evolution analysis\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP and in vitro activity assay with localization readout, single lab\",\n      \"pmids\": [\"33844468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP12 deubiquitinates and stabilizes p65 (NF-κB subunit) in monocytic MDSCs, sustaining expression of iNOS and PD-L1 and thereby promoting MDSC immunosuppressive function.\",\n      \"method\": \"USP12-knockout mice, co-immunoprecipitation, ubiquitination assay, flow cytometry for iNOS/PD-L1, CD8+ T cell suppression assay\",\n      \"journal\": \"Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — knockout mice with Co-IP and ubiquitination assay, single lab\",\n      \"pmids\": [\"35898171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP12 directly interacts with Bax and removes K63-linked ubiquitin chains from Bax (at K128 and K190), affecting Bax half-life but not proteasomal degradation.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, site-directed mutagenesis of Bax ubiquitination sites (K128R, K189R, K190R), protein half-life assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Y2H plus mutagenesis and half-life assay, single lab\",\n      \"pmids\": [\"36361894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP12 directly interacts with and deubiquitinates RRM2 (ribonucleotide reductase subunit M2) in non-small cell lung cancer cells, stabilizing RRM2 protein levels; USP12 knockdown causes DNA replication stress.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, DNA replication stress assay, in vivo tumor growth assay\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP and ubiquitination assay establishing direct substrate relationship, single lab\",\n      \"pmids\": [\"37341611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP12 deubiquitinates and stabilizes IFI16, preventing its proteasomal degradation and thereby sustaining IFI16-STING-IRF3 and p65-mediated antiviral signaling in response to HSV-1.\",\n      \"method\": \"USP12 knockout/knockdown, co-immunoprecipitation, ubiquitination assay, IFN-β/ISG expression, viral replication assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — knockout plus Co-IP and ubiquitination assay with antiviral functional readout, single lab\",\n      \"pmids\": [\"37410794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WDR20 facilitates simultaneous USP12/46-mediated deubiquitination of c-Myc, maintaining c-Myc protein stability and preventing HCC cellular senescence; WDR20 silencing destabilizes c-Myc and promotes CDKN1A transcription.\",\n      \"method\": \"siRNA screen, co-immunoprecipitation, ubiquitination assay, HCC xenograft/transgenic mouse models, patient-derived organoids\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP and ubiquitination assay with multiple in vivo model validation, but USP12 and USP46 not distinguished; single lab\",\n      \"pmids\": [\"39432777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"USP12 deubiquitinates YAP, specifically inhibiting K48-linked poly-ubiquitination at K315, thereby stabilizing YAP and promoting gastric cancer progression via the Hippo/YAP axis; USP12 localizes to the nucleus and co-immunoprecipitates with YAP.\",\n      \"method\": \"DUB siRNA library screen, co-immunoprecipitation, immunostaining for nuclear localization, ubiquitination assay with K315 site mutagenesis, siRNA knockdown and overexpression with YAP activity readouts\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP, site-specific mutagenesis, and functional rescue, single lab\",\n      \"pmids\": [\"38605077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"USP12 deubiquitinates FOXO3, preventing its ubiquitin-mediated degradation; elevated USP12 (stabilized by METTL3/YTHDF1-dependent m6A modification) enhances FOXO3 binding to the PUMA promoter, activating intrinsic apoptosis in sepsis-induced myocardial dysfunction.\",\n      \"method\": \"Proteomic profiling in LPS-induced mouse model, co-immunoprecipitation, ubiquitination assay, METTL3/YTHDF1 inhibitor experiments, in vitro and in vivo loss-of-function\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP and ubiquitination assay with in vivo validation and upstream regulatory mechanism identified, single lab\",\n      \"pmids\": [\"39662205\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"USP12 is a deubiquitinating enzyme that functions as a catalytic subunit within a ternary complex with the scaffold/activator UAF1 (WDR48) and the stimulatory subunit WDR20 (or alternatively DMWD); crystal structure and mutagenesis show UAF1 binds USP12 at two sites (high-affinity fingers subdomain interface required for activation), WDR20 further stimulates activity and controls CRM1-dependent nucleocytoplasmic shuttling of the complex, and the enzyme acts on a broad range of substrates—including histones H2A/H2B, AR, MDM2, Notch, PHLPP1/2, LAT, Trat1, BCL10, HMGB1, p300, IFI16, YAP, RRM2, c-Myc, p65, PPM1B, MDK, FOXO3, and Bax—to regulate gene expression, cell proliferation and survival, T cell and innate immune signaling, and viral defense; additionally, USP12 inhibits CBP acetyltransferase activity independently of its deubiquitinase function during interferon signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"USP12 is a deubiquitinating enzyme that functions as the catalytic subunit of a ternary complex with the WD40-repeat scaffold UAF1 (WDR48) and the activating subunit WDR20, controlling the stability and trafficking of a broad range of substrates to regulate gene expression, cell proliferation, immune signaling, and antiviral defense [#0, #1]. UAF1 binds USP12 at two sites with 1:2 stoichiometry, and engagement of the high-affinity fingers-subdomain interface is required for activation, while WDR20 further stimulates catalysis and, together with UAF1, governs CRM1-dependent shuttling of the complex between plasma membrane, cytoplasm, and nucleus via an N-terminal motif in USP12 and an export sequence in WDR20 [#1, #8, #12]; the paralog-related protein DMWD binds the same interface as WDR20 in a mutually exclusive manner and likewise activates the enzyme while differentially tuning its localization [#19]. Through nucleosomal deubiquitination of histones H2A/H2B and removal of degradative or trafficking-directed ubiquitin marks, USP12 stabilizes diverse substrates including the androgen receptor, MDM2, PHLPP1/2, BCL10, p65, p300, c-Myc, YAP, RRM2, IFI16, HMGB1, midkine, FOXO3 and Bax, and promotes Notch lysosomal degradation [#0, #2, #3, #4, #11, #17, #20, #22, #23, #25]. In T-cell receptor signaling, USP12 deubiquitinates LAT and Trat1 to preserve the proximal TCR complex and downstream NF-\\u03baB, NFAT, and MAPK activation [#9], and it potentiates innate and antiviral responses by stabilizing NF-\\u03baB and STING-pathway components [#14, #20, #23]. Independently of its catalytic activity, nuclear USP12 binds the CBP HAT domain to inhibit CBP-mediated acetylation of phospho-STAT1, sustaining nuclear p-STAT1 during interferon signaling [#13].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Established that USP12 is a chromatin-directed deubiquitinase whose activity depends on an obligate partner, defining the molecular logic of substrate engagement.\",\n      \"evidence\": \"In vitro deubiquitination of nucleosomal H2A/H2B plus Xenopus knockdown and ChIP, with UAF1 co-IP showing the partner is required for activity\",\n      \"pmids\": [\"21183687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how UAF1 binding activates the catalytic domain\", \"Range of physiological histone-modified loci not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified WDR20 as a third, USP12-selective subunit, establishing the ternary architecture and showing activation is partner-specific rather than generic.\",\n      \"evidence\": \"Tandem affinity purification of the ternary complex, in vitro DUB activity assay, and siRNA depletion comparing USP12 vs USP1 complexes\",\n      \"pmids\": [\"20147737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of WDR20 stimulation not resolved\", \"Whether WDR20 alters substrate selection unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed USP12 acts on a membrane-receptor substrate to direct its trafficking fate, extending its role beyond chromatin into receptor degradation control.\",\n      \"evidence\": \"shRNA screen, in vitro DUB assay, cell-based Notch trafficking, and Drosophila homolog genetic validation\",\n      \"pmids\": [\"22778262\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin linkage type on Notch not defined\", \"How USP12 is targeted to endosomal Notch unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked USP12 to oncogenic signaling by showing it stabilizes the androgen receptor and the Akt phosphatase PHLPP1, positioning it as a node controlling proliferation and survival signaling.\",\n      \"evidence\": \"siRNA/TAP, co-IP, in vivo ubiquitination assays, AR transcription reporters, and Akt activity readouts\",\n      \"pmids\": [\"24056413\", \"24145035\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro reconstitution of AR or PHLPP1 deubiquitination\", \"Single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Integrated the AR and PHLPP findings into a single circuit, showing USP12 dampens Akt to indirectly stabilize and activate AR.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, and phospho-Akt/phospho-AR immunoblotting in prostate cancer cells\",\n      \"pmids\": [\"25216524\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect contributions to AR stability not separated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated that USP12's proliferative role requires catalytic activity, ruling out a purely scaffolding contribution to cell-cycle control.\",\n      \"evidence\": \"siRNA knockdown plus catalytically inactive C48S mutant, flow cytometry cell-cycle analysis, and qPCR of BMI-1/c-Myc/cyclin D2\",\n      \"pmids\": [\"26680102\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrates driving G1 arrest not identified\", \"Effects on transcript levels mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided the structural mechanism of activation, showing two UAF1 sites of distinct affinity and that only the high-affinity fingers interface drives catalysis.\",\n      \"evidence\": \"2.8 \\u00c5 crystal structure of USP12-Ub/UAF1, ITC, site-directed mutagenesis, and in vitro DUB activity assay\",\n      \"pmids\": [\"27650958\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"WDR20 not included in the structure\", \"Function of the second, low-affinity UAF1 site unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined USP12 as a positive regulator of T-cell receptor signaling by identifying LAT and Trat1 as substrates protected from lysosomal degradation.\",\n      \"evidence\": \"Activity-based probe labeling in primary T cells, USP12-/- Jurkat cells with WT rescue, proximity BirA labeling, and surface TCR flow cytometry\",\n      \"pmids\": [\"26811477\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for stimulation-induced USP12 phosphorylation not identified\", \"Ubiquitin linkage chemistry on LAT/Trat1 not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected the USP12/UAF1/WDR20 complex to viral transcriptional reprogramming through EBNA3 viral proteins.\",\n      \"evidence\": \"TAP/MS, co-IP, and ChIP placing WDR48 at the p14(ARF) promoter in an EBNA3C-dependent manner\",\n      \"pmids\": [\"25855980\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"USP12 and its paralog USP46 not distinguished\", \"Catalytic relevance to the promoter effect untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expanded the prostate-cancer circuit by showing USP12 deubiquitinates MDM2 in addition to AR, embedding it in a TP53-MDM2-AR-AKT network.\",\n      \"evidence\": \"Denaturing co-IP confirming direct deubiquitination plus transcriptome analysis and immunopathology\",\n      \"pmids\": [\"29755129\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Net directionality on p53 levels context-dependent\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved the subcellular control of the complex, showing WDR20 recruits USP12 to the plasma membrane and CRM1-dependent export drives shuttling, dependent on defined motifs in USP12 and WDR20.\",\n      \"evidence\": \"Confocal/live microscopy of tagged proteins, mutagenesis of the USP12 N-terminal motif, and leptomycin B CRM1 inhibition\",\n      \"pmids\": [\"30466959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of each localization not directly demonstrated\", \"Import machinery not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed a catalysis-independent function of USP12 in interferon signaling, where it inhibits CBP acetyltransferase to sustain nuclear phospho-STAT1.\",\n      \"evidence\": \"Co-IP mapping USP12 to the CBP HAT domain, acetyltransferase activity assay, p-STAT1 immunoblotting, and antiviral assays\",\n      \"pmids\": [\"31899788\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Deubiquitinase-independence not confirmed by catalytic-dead mutant in this context\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established a recurring theme of USP12 stabilizing distinct substrates to control NF-\\u03baB output across immune and tumor contexts (PPM1B, BCL10, p65).\",\n      \"evidence\": \"USP12 knockout/knockdown mice, co-IP, ubiquitination assays, NF-\\u03baB reporters, and immune microenvironment/T-cell differentiation analyses\",\n      \"pmids\": [\"34381028\", \"33941870\", \"35898171\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Opposing effects on NF-\\u03baB (via PPM1B vs p65/BCL10) not mechanistically reconciled\", \"Ubiquitin linkage specificity varies and largely undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Broadened the substrate repertoire to transcriptional, survival, and angiogenic regulators (p300, HMGB1, midkine), linking USP12 to autophagy, cardiac hypertrophy, and cancer angiogenesis.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, knockdown with functional rescue, and in vivo disease models\",\n      \"pmids\": [\"34339675\", \"34997217\", \"34759262\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs complex-dependent deubiquitination not separated for each substrate\", \"Single lab per substrate\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Characterized DMWD as an alternative activating subunit binding the WDR20 interface in mutually exclusive fashion, indicating combinatorial control of activity and localization.\",\n      \"evidence\": \"Direct co-IP of tagged proteins, in vitro DUB activity assay, localization microscopy, and phylogenetic analysis\",\n      \"pmids\": [\"33844468\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological contexts favoring DMWD vs WDR20 unknown\", \"Structural basis of competition not solved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed USP12 directly removes K63-linked ubiquitin from Bax at specific lysines, affecting half-life without proteasomal degradation, implicating it in apoptotic control.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, and site-directed mutagenesis of Bax K128/K190 with half-life assays\",\n      \"pmids\": [\"36361894\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular outcome of Bax K63 chain removal not fully defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended USP12 into nucleotide metabolism/replication and antiviral DNA sensing by stabilizing RRM2 and IFI16.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, DNA replication stress readouts, USP12 knockout, and HSV-1 antiviral assays\",\n      \"pmids\": [\"37341611\", \"37410794\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the same complex composition governs both substrates untested\", \"Single lab per substrate\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Further generalized USP12-family deubiquitination of growth/oncogenic regulators (c-Myc, YAP, FOXO3), including site-specific control of YAP K48 chains and m6A-driven upregulation of USP12.\",\n      \"evidence\": \"DUB siRNA library screens, co-IP, site-specific ubiquitination mutagenesis (YAP K315), and in vivo HCC/gastric/sepsis models\",\n      \"pmids\": [\"39432777\", \"38605077\", \"39662205\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"USP12 vs USP46 not distinguished for c-Myc\", \"Context-determinants of substrate choice remain unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How USP12 achieves substrate selectivity across such a broad, context-dependent substrate range, and what dictates the choice between WDR20- vs DMWD-bound complexes and catalytic vs non-catalytic functions, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying determinant of substrate recognition identified\", \"Subunit-composition rules for substrate/localization choice undefined\", \"Catalysis-independent CBP inhibition not generalized beyond IFN context\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 9, 21, 25]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 12, 13, 25]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9, 12]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 17, 20, 23]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 16, 24, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 14, 25]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6, 24]}\n    ],\n    \"complexes\": [\"USP12-UAF1(WDR48)-WDR20 deubiquitinase complex\"],\n    \"partners\": [\"WDR48\", \"WDR20\", \"DMWD\", \"AR\", \"PHLPP1\", \"MDM2\", \"BCL10\", \"CREBBP\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}