{"gene":"TRIP12","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2012,"finding":"TRIP12 (together with UBR5) controls accumulation of RNF168, a rate-limiting HECT E3 ligase that ubiquitylates histones after DNA double-strand breaks. Depletion of TRIP12 and UBR5 allows supraphysiological RNF168 accumulation, leading to massive spreading of ubiquitin conjugates and hyperaccumulation of 53BP1 and BRCA1, demonstrating that TRIP12 restricts the spread of chromatin ubiquitylation at DNA lesions.","method":"siRNA depletion, immunofluorescence, western blotting, DNA damage induction","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal depletion/rescue experiments with multiple orthogonal readouts, widely replicated by subsequent studies","pmids":["22884692"],"is_preprint":false},{"year":2020,"finding":"TRIP12 binds PARP1 via a central PAR-binding WWE domain and, using its C-terminal HECT domain, catalyzes polyubiquitylation of PARP1 to trigger proteasomal degradation, thereby controlling steady-state PARP1 levels and limiting PARPi-induced cytotoxic PARP1 trapping.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, TRIP12 domain mapping, siRNA/CRISPR KO, cell viability and DNA damage assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination assay plus domain mapping plus KO phenotype, single lab with multiple orthogonal methods","pmids":["32755579"],"is_preprint":false},{"year":2021,"finding":"TRIP12 assembles K29-linked ubiquitin chains on neo-substrates (e.g., BRD4 targeted by CRL2VHL-based PROTACs), facilitating formation of K29/K48-branched ubiquitin chains that accelerate K48 chain assembly by CRL2VHL and promote proteasomal degradation; TRIP12 associates with the neo-substrate via CRL2VHL but is dispensable for degradation of the endogenous CRL2VHL substrate HIF-1α.","method":"CRISPR KO, in vitro ubiquitination assay, ubiquitin linkage-specific mass spectrometry, co-immunoprecipitation, PROTAC-induced degradation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with linkage-specific MS and functional KO rescue, single lab with multiple orthogonal methods","pmids":["33567268"],"is_preprint":false},{"year":2008,"finding":"TRIP12 is the E3 enzyme of the human ubiquitin fusion degradation (UFD) pathway: its HECT domain catalyzes in vitro ubiquitination of UFD substrates (including UBB+1) in conjunction with E1, E2, and E4 enzymes, and possesses a noncovalent ubiquitin-binding site; knockdown of TRIP12 stabilizes UFD substrates and reduces UBB+1-induced cell death.","method":"In vitro ubiquitination assay, siRNA knockdown, cycloheximide chase, cross-linking, cell death assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with E1/E2/E4, cross-linking, and in vivo knockdown with multiple substrates, single lab","pmids":["19028681"],"is_preprint":false},{"year":2008,"finding":"TRIP12 functions as an E3 ubiquitin ligase for APP-BP1 (NAE1), the regulatory subunit of the NEDD8-activating enzyme: TRIP12 interacts specifically with the APP-BP1 monomer (not the APP-BP1/Uba3 heterodimer) via yeast two-hybrid and co-immunoprecipitation, catalyzes APP-BP1 polyubiquitination in vitro, and its knockdown stabilizes APP-BP1 and increases neddylation of CUL1.","method":"Yeast two-hybrid, co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown, overexpression","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination plus co-IP plus functional knockdown, single lab","pmids":["18627766"],"is_preprint":false},{"year":2012,"finding":"HUWE1 and TRIP12 function in parallel (independently) in the UFD pathway: double knockdown of both E3 ligases causes additive stabilization of the UFD substrate Ub(G76V)-YFP, yet ubiquitylation of the substrate persists, revealing functional redundancy with additional E3 ligases.","method":"siRNA library screen, high-throughput imaging, co-immunoprecipitation with 26S proteasome, cycloheximide chase","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis via double knockdown with orthogonal readouts, single lab","pmids":["23209776"],"is_preprint":false},{"year":2016,"finding":"TRIP12 functions as an E3 ubiquitin ligase for USP7/HAUSP, controlling USP7 protein stability and consequently affecting USP7-mediated stabilization of p53 and the checkpoint proteins 53BP1 and Chk1; TRIP12 knockdown increased the G1 cell population (mimicking USP7 overexpression) while TRIP12 overexpression increased the intra-S-phase population (mimicking USP7 knockdown).","method":"Co-immunoprecipitation, siRNA knockdown, overexpression, cell cycle analysis","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP plus reciprocal gain/loss-of-function phenotype, single lab","pmids":["27800609"],"is_preprint":false},{"year":2012,"finding":"TRADD modulates the interaction between p19ARF and its E3 ubiquitin ligase ULF (TRIP12) by shuttling from cytoplasm to nucleus, thereby promoting p19ARF stability and tumour suppression; TRADD deficiency reduced p19ARF accumulation and attenuated HRas-induced senescence.","method":"Mouse knockout model, primary cell senescence assay, subcellular fractionation, co-immunoprecipitation","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO plus co-IP plus localization experiments, single lab","pmids":["22561347"],"is_preprint":false},{"year":2010,"finding":"ULF (TRIP12) is a bona fide E3 ubiquitin ligase for ARF: ULF knockdown stabilizes ARF and reactivates p53 responses in AML cells expressing cytoplasmic-dislocated NPM mutant, demonstrating that ULF controls ARF turnover and the ARF-p53 axis.","method":"siRNA knockdown, cycloheximide chase, p53 response assays in OCI-AML3 cells","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in specific cellular context with defined ARF/p53 readout, single lab","pmids":["20699639"],"is_preprint":false},{"year":2011,"finding":"The E3 ubiquitin ligase activity of Trip12 is essential for mouse embryogenesis: a homozygous inactivating mutation in the HECT domain causes embryonic lethality at mid-gestation; Trip12 mutant ES cells are viable but show decreased proliferation, increased BAF57 protein levels (SWI/SNF complex component), and altered gene expression.","method":"Mouse knock-in model, ES cell culture, western blotting, gene expression profiling","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic model with defined catalytic mutation, multiple cellular phenotypes, replication confirmed by subsequent studies","pmids":["22028794"],"is_preprint":false},{"year":2021,"finding":"TRIP12 ubiquitinates glucocerebrosidase (GCase) at lysine 293, triggering its proteasomal degradation; TRIP12-mediated GCase degradation leads to functional GCase impairment, subsequent α-synuclein accumulation, and mitochondrial dysfunction in a Parkinson's disease context.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, site-directed mutagenesis (K293), conditional KO/knockdown, α-syn preformed fibril model in vivo","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination with specific lysine mapping, conditional KO with in vivo rescue, single lab with multiple orthogonal methods","pmids":["34644545"],"is_preprint":false},{"year":2021,"finding":"TRIP12 ubiquitylates FBW7 preferentially on K404/K412 via K11-linked branched ubiquitin chains; SCF(FBW7)-mediated ubiquitylation alone is insufficient for proteasomal degradation and requires this additional TRIP12-mediated branched K11 ubiquitylation. TRIP12 inactivation causes FBW7 accumulation and sensitizes cancer cells to anti-tubulin chemotherapy through increased MCL1 degradation.","method":"shRNA library screen, mass spectrometry-based ubiquitin site mapping, CRISPR KO, epistasis (FBW7 co-inactivation rescue)","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — MS-based site mapping plus genetic epistasis plus functional rescue in multiple cell lines, single lab","pmids":["33824312"],"is_preprint":false},{"year":2021,"finding":"WARS (tryptophanyl-tRNA synthetase) tryptophanylates TRIP12 at lysine 1136, activating its E3 ligase activity; activated TRIP12 degrades NFATc1 (a PD-1 transcription activator), thereby downregulating surface PD-1 on CD8+ T cells. SIRT1 de-tryptophanylates TRIP12 and reverses these effects.","method":"Mass spectrometry, biochemical analyses, flow cytometry, WARS overexpression, SIRT1 manipulation, in vitro co-culture, syngeneic mouse models","journal":"Journal for immunotherapy of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical modification identified by MS with functional rescue experiments, single lab","pmids":["34326168"],"is_preprint":false},{"year":2020,"finding":"TRIP12 expression is cell-cycle regulated and correlates with its nuclear localization. An N-terminal intrinsically disordered region (IDR) mediates euchromatin binding. TRIP12 controls the duration of DNA replication and mitotic entry independently of its catalytic activity, and is required for mitotic progression and chromosome stability.","method":"Cell cycle synchronization, immunofluorescence, subcellular fractionation, CRISPR KO, siRNA knockdown, chromosome spread assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional KO readout, multiple methods, single lab","pmids":["31964993"],"is_preprint":false},{"year":2020,"finding":"TRIP12 binds and ubiquitinates the transcription factor YY1, leading to its proteasomal degradation; this TRIP12/YY1 axis controls HNF4α/miR-122/CCL2 signaling and hepatic inflammation under mild iron overload conditions.","method":"Immunoprecipitation coupled LC-MS/MS, co-immunoprecipitation, in vivo mouse model, YY1 overexpression/silencing","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — substrate identified by IP-MS and validated by co-IP with functional in vivo rescue, single lab","pmids":["33080340"],"is_preprint":false},{"year":2016,"finding":"p16 overexpression leads to downregulation of TRIP12, which in turn increases RNF168 levels and represses DNA damage repair, increases 53BP1 foci, and enhances radioresponsiveness, placing TRIP12 downstream of p16 in a pathway controlling DDR and radiosensitivity.","method":"siRNA knockdown, overexpression, clonogenic survival, western blotting, cycloheximide chase, 53BP1 immunofluorescence, comet assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis established by sequential knockdown/overexpression with multiple functional readouts, single lab","pmids":["27425591"],"is_preprint":false},{"year":2014,"finding":"Nucleostemin (NS) stabilizes ARF by inhibiting its E3 ligase ULF (TRIP12): NS overexpression suppresses ARF polyubiquitination by ULF and extends ARF half-life, while NS knockdown decreases ARF levels; NS can also enhance NPM-mediated ARF stabilization.","method":"Affinity purification/mass spectrometry, co-immunoprecipitation, in vitro and in vivo ubiquitination assays, cycloheximide chase","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — interaction identified by AP-MS, validated by co-IP and ubiquitination assay, single lab","pmids":["24769896"],"is_preprint":false},{"year":2023,"finding":"TRIP12 controls TGFβ signalling independently of its E3 ubiquitin ligase catalytic activity: TRIP12 recruits SMURF2 to SMAD4, promoting inhibitory SMAD4 monoubiquitination; loss of TRIP12 robustly activates TGFβ signalling, and rescue with a catalytically inactive C1959A mutant fully restores normal signalling. This function is evolutionarily conserved in Drosophila.","method":"CRISPR/Cas9 KO, catalytic mutant rescue, co-immunoprecipitation, 3D organoids, Drosophila genetic epistasis","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Moderate — catalytic mutant rescue plus co-IP plus genetic epistasis across multiple organisms and model systems, single lab","pmids":["37863914"],"is_preprint":false},{"year":2025,"finding":"TRIP12 is a ubiquitin chain elongation factor that cooperates with CUL3KEAP1 to ensure robust NRF2 degradation; TRIP12 promotes NRF2 turnover during recovery from oxidative stress, limiting NRF2 activation during stress and accelerating stress response silencing as ROS are cleared.","method":"CRISPR KO, in vitro ubiquitination assay, NRF2 stability assays, cell death readouts (oxeiptosis), epistasis with CUL3KEAP1","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution plus KO epistasis with defined pathway component, single lab","pmids":["40928944"],"is_preprint":false},{"year":2025,"finding":"TRIP12 ubiquitylates DNA polymerase β (Polβ) in a BER complex-dependent manner, controlling cellular levels and chromatin loading of Polβ; TRIP12, but not its partner UBR5, regulates Polβ foci formation after radiation-induced DNA damage, and excessive TRIP12-mediated Polβ engagement promotes BER precedence over DSB repair, affecting DSB formation and radiation sensitivity.","method":"In vitro ubiquitination assay, CRISPR/siRNA KO, chromatin fractionation, immunofluorescence (Polβ foci), clonogenic survival","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination plus KO with functional chromatin-loading and survival readouts, single lab","pmids":["40613707"],"is_preprint":false},{"year":2025,"finding":"TRIP12 ubiquitylates the SWI/SNF component BRG1 in the presence of Wnt, promoting BRG1–β-catenin interaction in the nucleus and recruitment of SWI/SNF to Wnt target genes; genetic epistasis places TRIP12 downstream of the β-catenin destruction complex, and TRIP12 depletion attenuates Wnt signalling in Drosophila, zebrafish, mouse organoids, and human cells.","method":"CRISPR/siRNA KO, co-immunoprecipitation, in vitro ubiquitination assay, genetic epistasis across multiple model organisms, luciferase reporter assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro ubiquitination plus reciprocal co-IP plus epistasis replicated across four model systems, single lab with multiple orthogonal methods","pmids":["40473626"],"is_preprint":false},{"year":2024,"finding":"TRIP12 selectively ubiquitinates the third intracellular loop of Frizzled-9b (Fzd9b) at K437, targeting it for lysosomal degradation and reducing Fzd9b surface expression, thereby dampening Wnt9a/Fzd9b signalling and affecting hematopoietic stem cell proliferation in zebrafish.","method":"CRISPR/siRNA KO in zebrafish, site-directed mutagenesis (K437), flow cytometry for surface receptor levels, in vivo HSC proliferation assay","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis plus in vivo zebrafish model with functional readout, single lab","pmids":["41098776"],"is_preprint":false},{"year":2024,"finding":"K29-linked ubiquitylation of the H3K9me3 methyltransferase SUV39H1 is catalyzed by TRIP12 and reversed by TRABID; K29-linked ubiquitylation is essential for proteasomal degradation of SUV39H1 even in the presence of K48-linked ubiquitylation, and disruption of this modification deregulates the H3K9me3 landscape.","method":"Ubiquitin replacement strategy (cell-based), linkage-specific ubiquitin chain profiling, TRIP12 KO, K29 chain assembly assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — cell-based ubiquitin replacement plus KO with MS-based chain specificity, preprint single lab","pmids":["bio_10.1101_2024.10.29.620783"],"is_preprint":true},{"year":2023,"finding":"TRIP12 suppresses epithelial-mesenchymal transition (EMT) by inhibiting ZEB1/2 gene expression; TRIP12 depletion causes an EMT shift, loss of cell polarity, increased cellular motility, and ZEB1/2 depletion rescues EMT markers in TRIP12-depleted cells.","method":"siRNA depletion, RNA-seq, EMT marker western blotting, cell motility/polarity assays, anoikis assay, epistasis by ZEB1/2 co-depletion","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis by double KD with multiple orthogonal EMT readouts, single lab","pmids":["33963176"],"is_preprint":false},{"year":2023,"finding":"TRIP12 promotes BRD4 degradation by PROTAC-bound CRL2VHL but is dispensable for the degradation of the endogenous CRL2VHL substrate HIF-1α; TRIP12 associates with BRD4 via CRL2VHL and preferentially assembles K29-linked ubiquitin chains. (Replicated finding from PMID:33567268, additional mechanistic detail from a separate paper.)","method":"shRNA screen, co-immunoprecipitation, in vitro ubiquitination assay, mass spectrometry","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with linkage-specific MS, replicated across multiple degrader scaffolds","pmids":["33567268"],"is_preprint":false},{"year":2026,"finding":"TRIP12 stabilizes HIV-1 Tat independently of its own E3 ligase activity by enhancing the interaction between deubiquitinase USP7 and Tat, thereby reducing K48-linked ubiquitination of Tat and inhibiting its proteasomal degradation; TRIP12 KO reduces USP7–Tat interaction, accelerates Tat degradation, and suppresses viral transcription and latency reactivation.","method":"Co-immunoprecipitation, catalytic mutant (E3 ligase-dead) rescue, TRIP12 KO, viral transcription and reactivation assays","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus catalytic-dead mutant rescue plus KO functional readout, single lab","pmids":["42126234"],"is_preprint":false},{"year":2023,"finding":"Small molecule Z363 activates TRIP12, which directly ubiquitinates and degrades MYC (following MYC phosphorylation at Thr58) and also induces degradation of TAF10, indirectly reducing MYC levels; TRIP12 thus controls MYC stability both directly and via TAF10.","method":"CRISPR KO, western blotting, cell culture degradation assays, mouse tumor models","journal":"Clinical and translational medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, primarily western blot with no in vitro ubiquitination assay for MYC; mechanistic claim of direct ubiquitination not fully reconstituted","pmids":["36639831"],"is_preprint":false},{"year":2026,"finding":"TRIP12's N-terminal intrinsically disordered region (IDR) drives formation of chromatin condensates enriched in heterochromatin marks through electrostatic interactions and bridging-induced phase separation; TRIP12-mediated condensate formation alters cell cycle progression, genome accessibility, and transcription independently of its ubiquitin ligase activity.","method":"Overexpression of IDR deletion mutants, live-cell imaging, FRAP, ATAC-seq, RNA-seq, biophysical condensate assays","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with catalytic-dead mutant, live imaging plus chromatin accessibility readouts, single lab","pmids":["41660270"],"is_preprint":false},{"year":2023,"finding":"Ku70 phosphorylation at S155 enhances association with TRIP12; co-immunoprecipitation showed increased TRIP12–Ku70 interaction upon ionizing radiation treatment, suggesting TRIP12 associates with Ku70 in a DNA-damage-dependent manner.","method":"BioID2 proximity labeling, proximity ligation assay, co-immunoprecipitation with ionizing radiation treatment","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single proximity labeling screen plus one co-IP validation, single lab, no functional consequence fully established","pmids":["37108203"],"is_preprint":false},{"year":2024,"finding":"TRIP12 is required for pancreatic acinar-to-ductal metaplasia (ADM) and KrasG12D-induced preneoplastic lesion formation in vivo; loss of TRIP12 prevents ADM after pancreatic injury and impairs metastasis in KrasG12D/Trp53R172H mice, while TRIP12 overexpression is required for PDAC cell growth and E2F target gene expression.","method":"Genetically modified mouse models (conditional KO, KrasG12D/Trp53R172H), ex vivo acinar explants, PDAC cell lines, western blotting","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vivo mouse genetic models with defined phenotypes, single lab","pmids":["38924548"],"is_preprint":false}],"current_model":"TRIP12 is a HECT-domain E3 ubiquitin ligase that targets a broad array of substrates—including RNF168, PARP1, ARF/p14ARF, UFD-pathway substrates (UBB+1), APP-BP1/NAE1, USP7, GCase, FBW7, BRG1, Fzd9b, SUV39H1, NRF2 (cooperating with CUL3KEAP1), Polβ, NFATc1, and YY1—for polyubiquitination and proteasomal (or lysosomal) degradation, preferentially assembling K29- and K11-linked or branched K29/K48 ubiquitin chains; it also exerts ubiquitin-ligase-independent functions, including scaffolding SMURF2 to SMAD4 to repress TGFβ signalling, promoting USP7-mediated Tat stabilization, and forming chromatin condensates via its N-terminal intrinsically disordered region, collectively placing TRIP12 as a master regulator of DNA damage response, cell cycle progression, protein quality control, Wnt and TGFβ signalling, and genome integrity."},"narrative":{"mechanistic_narrative":"TRIP12 is a HECT-domain E3 ubiquitin ligase whose catalytic activity is essential for mammalian development and which serves as a master regulator of protein turnover across the DNA damage response, cell cycle, protein quality control, and developmental signalling [PMID:22028794]. A defining biochemical feature is its ability to assemble atypical and branched ubiquitin chains: it builds K29-linked chains and K29/K48-branched chains that accelerate K48 chain assembly and proteasomal degradation, both on PROTAC neo-substrates recruited via CRL2VHL [PMID:33567268] and on the H3K9me3 methyltransferase SUV39H1, where K29 linkage is required for degradation even in the presence of K48 chains [PMID:bio_10.1101_2024.10.29.620783], and it elongates K11-branched chains on FBW7 to license its destruction [PMID:33824312]. In genome maintenance, TRIP12 restricts the spread of chromatin ubiquitylation at double-strand breaks by limiting accumulation of the RNF168 E3 ligase [PMID:22884692], controls steady-state PARP1 levels to limit PARPi-induced PARP1 trapping [PMID:32755579], and ubiquitylates DNA polymerase β to govern its chromatin loading and the balance between base-excision and double-strand-break repair [PMID:40613707]. It acts as the human ubiquitin-fusion-degradation (UFD) pathway E3 ligase [PMID:19028681, PMID:23209776] and degrades a broad substrate set including the NEDD8-activating enzyme subunit APP-BP1/NAE1 [PMID:18627766], the deubiquitinase USP7 [PMID:27800609], the tumour suppressor ARF [PMID:20699639], glucocerebrosidase [PMID:34644545], and the transcription factors YY1 and NFATc1 [PMID:34326168, PMID:33080340]. TRIP12 also exerts ubiquitin-ligase-independent functions: an N-terminal intrinsically disordered region binds euchromatin and drives chromatin condensate formation that controls cell-cycle progression and genome accessibility [PMID:31964993, PMID:41660270], it scaffolds SMURF2 onto SMAD4 to repress TGFβ signalling [PMID:37863914], and it stabilizes HIV-1 Tat by enhancing the USP7–Tat interaction [PMID:42126234]. In Wnt signalling it acts downstream of the β-catenin destruction complex, ubiquitylating BRG1 to promote SWI/SNF recruitment to target genes while also degrading the receptor Frizzled-9b [PMID:40473626, PMID:41098776].","teleology":[{"year":2008,"claim":"Established TRIP12 as a genuine HECT E3 ligase by defining its enzymatic role in the ubiquitin-fusion-degradation pathway and on the neddylation enzyme subunit APP-BP1, anchoring its catalytic function biochemically.","evidence":"In vitro ubiquitination with E1/E2/E4, cross-linking, yeast two-hybrid, and siRNA knockdown of UFD substrates and APP-BP1","pmids":["19028681","18627766"],"confidence":"High","gaps":["Full substrate repertoire and chain-linkage preference not yet defined","Physiological consequences of APP-BP1 stabilization on global neddylation only partially explored"]},{"year":2011,"claim":"Demonstrated that TRIP12 catalytic activity is indispensable in vivo, showing a HECT-domain mutation causes embryonic lethality and linking TRIP12 to SWI/SNF (BAF57) regulation and proliferation.","evidence":"Mouse catalytic knock-in model, ES cell phenotyping, gene expression profiling","pmids":["22028794"],"confidence":"High","gaps":["Critical developmental substrate(s) driving lethality not identified","Mechanism linking TRIP12 to BAF57 levels unresolved at this stage"]},{"year":2012,"claim":"Positioned TRIP12 as a brake on the DNA damage response by limiting RNF168 accumulation and thereby restricting the spread of chromatin ubiquitylation and 53BP1/BRCA1 recruitment at breaks.","evidence":"siRNA depletion of TRIP12/UBR5, immunofluorescence, DNA damage induction","pmids":["22884692"],"confidence":"High","gaps":["Chain linkage on RNF168 not defined","Relative contributions of TRIP12 versus UBR5 not separated"]},{"year":2012,"claim":"Defined TRIP12 (ULF) as the E3 ligase controlling ARF turnover and the ARF-p53 tumour-suppressor axis, including regulation by TRADD shuttling.","evidence":"siRNA knockdown, cycloheximide chase, p53 response assays, mouse TRADD knockout with senescence assays and co-IP","pmids":["20699639","22561347"],"confidence":"Medium","gaps":["Direct ARF ubiquitination by TRIP12 in vitro not shown in these studies","Ubiquitin chain type on ARF undefined"]},{"year":2016,"claim":"Connected TRIP12 to checkpoint control by identifying USP7 as a substrate and placing TRIP12 downstream of p16 in regulating RNF168, DDR, and radiosensitivity.","evidence":"Co-IP, reciprocal gain/loss-of-function, cell cycle analysis, clonogenic survival, comet assay","pmids":["27800609","27425591"],"confidence":"Medium","gaps":["No in vitro ubiquitination assay for USP7","Direct versus indirect effects on p53/53BP1/Chk1 not fully separated"]},{"year":2020,"claim":"Revealed TRIP12 controls PARP1 levels through a WWE-domain PAR-binding mechanism, and uncovered a catalytic-activity-independent chromatin-binding role of its N-terminal IDR in cell-cycle and chromosome stability.","evidence":"Co-IP, domain mapping, in vitro ubiquitination, KO viability assays, subcellular fractionation, chromosome spreads","pmids":["32755579","31964993"],"confidence":"High","gaps":["Chain architecture on PARP1 not characterized","Molecular basis of IDR euchromatin binding not yet structurally defined"]},{"year":2021,"claim":"Established TRIP12 as a branched-chain elongation factor that assembles K29-linked and K11/K29/K48-branched ubiquitin chains, accelerating degradation of PROTAC neo-substrates, FBW7, and GCase via lysine-specific modification.","evidence":"CRISPR KO, in vitro ubiquitination, linkage-specific mass spectrometry, site-directed mutagenesis, PROTAC degradation and chemosensitization assays","pmids":["33567268","33824312","34644545"],"confidence":"High","gaps":["Determinants of TRIP12 substrate/linkage selectivity unresolved","How branched chains are read by the proteasome not addressed here"]},{"year":2021,"claim":"Showed TRIP12 activity is itself regulated by post-translational modification (WARS-mediated tryptophanylation, reversed by SIRT1) controlling NFATc1 degradation and PD-1 expression on CD8+ T cells.","evidence":"Mass spectrometry, biochemistry, flow cytometry, WARS/SIRT1 manipulation, syngeneic mouse models","pmids":["34326168"],"confidence":"Medium","gaps":["Structural basis of K1136 tryptophanylation-driven activation unknown","Generality of this regulation across other substrates untested"]},{"year":2023,"claim":"Defined ubiquitin-ligase-independent functions of TRIP12 in TGFβ repression by scaffolding SMURF2 onto SMAD4, and established roles in EMT suppression and pancreatic tumourigenesis.","evidence":"CRISPR KO with catalytic-dead (C1959A) rescue, co-IP, organoids, Drosophila epistasis; siRNA/RNA-seq EMT assays; conditional KO mouse PDAC models","pmids":["37863914","33963176","38924548"],"confidence":"High","gaps":["How TRIP12 selects scaffolding versus catalytic modes is unresolved","Mechanism of ZEB1/2 transcriptional repression not defined"]},{"year":2024,"claim":"Extended TRIP12 into developmental Wnt signalling and chromatin-modifier control, ubiquitylating BRG1 to recruit SWI/SNF to Wnt targets, degrading Frizzled-9b, and assembling K29 chains on SUV39H1 to shape the H3K9me3 landscape.","evidence":"CRISPR/siRNA KO, in vitro ubiquitination, reciprocal co-IP, site mutagenesis, ubiquitin replacement/linkage profiling, epistasis across Drosophila/zebrafish/mouse/human","pmids":["40473626","41098776","bio_10.1101_2024.10.29.620783"],"confidence":"Medium","gaps":["How Wnt switches TRIP12 between BRG1 stabilization and Fzd9b degradation is unclear","SUV39H1 finding remains a preprint awaiting peer review"]},{"year":2025,"claim":"Integrated TRIP12 into oxidative-stress and base-excision-repair control, acting as a chain-elongation factor cooperating with CUL3KEAP1 to degrade NRF2 and ubiquitylating Polβ to govern repair-pathway choice.","evidence":"CRISPR KO, in vitro ubiquitination, NRF2 and Polβ stability/chromatin-loading assays, oxeiptosis and clonogenic survival readouts","pmids":["40928944","40613707"],"confidence":"Medium","gaps":["Chain linkage on Polβ not defined","How TRIP12 partitions between CUL3KEAP1 cooperation and independent activity unresolved"]},{"year":2026,"claim":"Demonstrated that the TRIP12 IDR drives bridging-induced chromatin phase separation controlling genome accessibility and that TRIP12 can stabilize substrates non-catalytically, as for HIV-1 Tat via the USP7–Tat interaction.","evidence":"IDR deletion mutants, FRAP, ATAC-seq, biophysical condensate assays; co-IP with catalytic-dead rescue and viral transcription/reactivation assays","pmids":["41660270","42126234"],"confidence":"Medium","gaps":["Physiological triggers of condensate formation in vivo unclear","How condensate function and ligase function are coordinated remains open"]},{"year":null,"claim":"How TRIP12 selects among dozens of substrates and switches between catalytic ubiquitylation, branched-chain elongation, scaffolding, and phase-separation modes remains the central unresolved question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model integrating HECT, WWE, and IDR domains with substrate/linkage choice","Determinants of K29 versus K11 versus branched-chain output undefined","Rules governing catalytic versus non-catalytic engagement unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[3,1,2,11,10,22]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,6,14,19,20]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[17,25]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[13,27]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[13,7]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[13,27]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,1,19]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,5,11,2]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[13,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[17,20,21]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[18]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[22,27]}],"complexes":[],"partners":["UBR5","PARP1","USP7","SMURF2","SMAD4","FBW7","BRG1","YY1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q14669","full_name":"E3 ubiquitin-protein ligase TRIP12","aliases":["E3 ubiquitin-protein ligase for Arf","ULF","HECT-type E3 ubiquitin transferase TRIP12","Thyroid receptor-interacting protein 12","TR-interacting protein 12","TRIP-12"],"length_aa":2067,"mass_kda":228.5,"function":"E3 ubiquitin-protein ligase involved in ubiquitin fusion degradation (UFD) pathway and regulation of DNA repair (PubMed:19028681, PubMed:22884692, PubMed:40419785). Part of the ubiquitin fusion degradation (UFD) pathway, a process that mediates ubiquitination of protein at their N-terminus, regardless of the presence of lysine residues in target proteins (PubMed:19028681). Acts as a key regulator of DNA damage response by acting as a suppressor of RNF168, an E3 ubiquitin-protein ligase that promotes accumulation of 'Lys-63'-linked histone H2A and H2AX at DNA damage sites, thereby acting as a guard against excessive spreading of ubiquitinated chromatin at damaged chromosomes (PubMed:22884692). In normal cells, mediates ubiquitination and degradation of isoform p19ARF/ARF of CDKN2A, a lysine-less tumor suppressor required for p53/TP53 activation under oncogenic stress (PubMed:20208519). In cancer cells, however, isoform p19ARF/ARF and TRIP12 are located in different cell compartments, preventing isoform p19ARF/ARF ubiquitination and degradation (PubMed:20208519). Does not mediate ubiquitination of isoform p16-INK4a of CDKN2A (PubMed:20208519). Also catalyzes ubiquitination of NAE1 and SMARCE1, leading to their degradation (PubMed:18627766). Ubiquitination and degradation of target proteins is regulated by interaction with proteins such as MYC, TRADD or SMARCC1, which disrupt the interaction between TRIP12 and target proteins (PubMed:20829358). Mediates ubiquitination of ASXL1: following binding to N(6)-methyladenosine methylated DNA, ASXL1 is ubiquitinated by TRIP12, leading to its degradation and subsequent inactivation of the PR-DUB complex (PubMed:30982744)","subcellular_location":"Nucleus, nucleoplasm","url":"https://www.uniprot.org/uniprotkb/Q14669/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRIP12","classification":"Not Classified","n_dependent_lines":161,"n_total_lines":1208,"dependency_fraction":0.13327814569536423},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGN5","stoichiometry":0.2},{"gene":"NUMA1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TRIP12","total_profiled":1310},"omim":[{"mim_id":"619626","title":"METHYLTRANSFERASE 4, N6-ADENOSINE; METTL4","url":"https://www.omim.org/entry/619626"},{"mim_id":"617752","title":"CLARK-BARAITSER SYNDROME; CLABARS","url":"https://www.omim.org/entry/617752"},{"mim_id":"604506","title":"THYROID HORMONE RECEPTOR INTERACTOR 12; TRIP12","url":"https://www.omim.org/entry/604506"},{"mim_id":"300431","title":"ATKIN-FLAITZ SYNDROME","url":"https://www.omim.org/entry/300431"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear speckles","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRIP12"},"hgnc":{"alias_symbol":["KIAA0045","ULF","TRIPC"],"prev_symbol":[]},"alphafold":{"accession":"Q14669","domains":[{"cath_id":"-","chopping":"1117-1233_1465-1504","consensus_level":"high","plddt":88.9245,"start":1117,"end":1504},{"cath_id":"3.10.20.90","chopping":"1255-1311_1342-1369_1387-1402","consensus_level":"medium","plddt":82.6401,"start":1255,"end":1402},{"cath_id":"3.90.1750.10","chopping":"1589-1658_1668-1868","consensus_level":"medium","plddt":90.9303,"start":1589,"end":1868},{"cath_id":"3.30.2410.10","chopping":"1877-1986","consensus_level":"medium","plddt":89.0913,"start":1877,"end":1986}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14669","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14669-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14669-F1-predicted_aligned_error_v6.png","plddt_mean":66.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRIP12","jax_strain_url":"https://www.jax.org/strain/search?query=TRIP12"},"sequence":{"accession":"Q14669","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14669.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14669/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14669"}},"corpus_meta":[{"pmid":"22884692","id":"PMC_22884692","title":"TRIP12 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Depletion of TRIP12 and UBR5 allows supraphysiological RNF168 accumulation, leading to massive spreading of ubiquitin conjugates and hyperaccumulation of 53BP1 and BRCA1, demonstrating that TRIP12 restricts the spread of chromatin ubiquitylation at DNA lesions.\",\n      \"method\": \"siRNA depletion, immunofluorescence, western blotting, DNA damage induction\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal depletion/rescue experiments with multiple orthogonal readouts, widely replicated by subsequent studies\",\n      \"pmids\": [\"22884692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIP12 binds PARP1 via a central PAR-binding WWE domain and, using its C-terminal HECT domain, catalyzes polyubiquitylation of PARP1 to trigger proteasomal degradation, thereby controlling steady-state PARP1 levels and limiting PARPi-induced cytotoxic PARP1 trapping.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, TRIP12 domain mapping, siRNA/CRISPR KO, cell viability and DNA damage assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination assay plus domain mapping plus KO phenotype, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"32755579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIP12 assembles K29-linked ubiquitin chains on neo-substrates (e.g., BRD4 targeted by CRL2VHL-based PROTACs), facilitating formation of K29/K48-branched ubiquitin chains that accelerate K48 chain assembly by CRL2VHL and promote proteasomal degradation; TRIP12 associates with the neo-substrate via CRL2VHL but is dispensable for degradation of the endogenous CRL2VHL substrate HIF-1α.\",\n      \"method\": \"CRISPR KO, in vitro ubiquitination assay, ubiquitin linkage-specific mass spectrometry, co-immunoprecipitation, PROTAC-induced degradation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with linkage-specific MS and functional KO rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"33567268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRIP12 is the E3 enzyme of the human ubiquitin fusion degradation (UFD) pathway: its HECT domain catalyzes in vitro ubiquitination of UFD substrates (including UBB+1) in conjunction with E1, E2, and E4 enzymes, and possesses a noncovalent ubiquitin-binding site; knockdown of TRIP12 stabilizes UFD substrates and reduces UBB+1-induced cell death.\",\n      \"method\": \"In vitro ubiquitination assay, siRNA knockdown, cycloheximide chase, cross-linking, cell death assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with E1/E2/E4, cross-linking, and in vivo knockdown with multiple substrates, single lab\",\n      \"pmids\": [\"19028681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRIP12 functions as an E3 ubiquitin ligase for APP-BP1 (NAE1), the regulatory subunit of the NEDD8-activating enzyme: TRIP12 interacts specifically with the APP-BP1 monomer (not the APP-BP1/Uba3 heterodimer) via yeast two-hybrid and co-immunoprecipitation, catalyzes APP-BP1 polyubiquitination in vitro, and its knockdown stabilizes APP-BP1 and increases neddylation of CUL1.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown, overexpression\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination plus co-IP plus functional knockdown, single lab\",\n      \"pmids\": [\"18627766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HUWE1 and TRIP12 function in parallel (independently) in the UFD pathway: double knockdown of both E3 ligases causes additive stabilization of the UFD substrate Ub(G76V)-YFP, yet ubiquitylation of the substrate persists, revealing functional redundancy with additional E3 ligases.\",\n      \"method\": \"siRNA library screen, high-throughput imaging, co-immunoprecipitation with 26S proteasome, cycloheximide chase\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis via double knockdown with orthogonal readouts, single lab\",\n      \"pmids\": [\"23209776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIP12 functions as an E3 ubiquitin ligase for USP7/HAUSP, controlling USP7 protein stability and consequently affecting USP7-mediated stabilization of p53 and the checkpoint proteins 53BP1 and Chk1; TRIP12 knockdown increased the G1 cell population (mimicking USP7 overexpression) while TRIP12 overexpression increased the intra-S-phase population (mimicking USP7 knockdown).\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, overexpression, cell cycle analysis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP plus reciprocal gain/loss-of-function phenotype, single lab\",\n      \"pmids\": [\"27800609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRADD modulates the interaction between p19ARF and its E3 ubiquitin ligase ULF (TRIP12) by shuttling from cytoplasm to nucleus, thereby promoting p19ARF stability and tumour suppression; TRADD deficiency reduced p19ARF accumulation and attenuated HRas-induced senescence.\",\n      \"method\": \"Mouse knockout model, primary cell senescence assay, subcellular fractionation, co-immunoprecipitation\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO plus co-IP plus localization experiments, single lab\",\n      \"pmids\": [\"22561347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ULF (TRIP12) is a bona fide E3 ubiquitin ligase for ARF: ULF knockdown stabilizes ARF and reactivates p53 responses in AML cells expressing cytoplasmic-dislocated NPM mutant, demonstrating that ULF controls ARF turnover and the ARF-p53 axis.\",\n      \"method\": \"siRNA knockdown, cycloheximide chase, p53 response assays in OCI-AML3 cells\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in specific cellular context with defined ARF/p53 readout, single lab\",\n      \"pmids\": [\"20699639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The E3 ubiquitin ligase activity of Trip12 is essential for mouse embryogenesis: a homozygous inactivating mutation in the HECT domain causes embryonic lethality at mid-gestation; Trip12 mutant ES cells are viable but show decreased proliferation, increased BAF57 protein levels (SWI/SNF complex component), and altered gene expression.\",\n      \"method\": \"Mouse knock-in model, ES cell culture, western blotting, gene expression profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic model with defined catalytic mutation, multiple cellular phenotypes, replication confirmed by subsequent studies\",\n      \"pmids\": [\"22028794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIP12 ubiquitinates glucocerebrosidase (GCase) at lysine 293, triggering its proteasomal degradation; TRIP12-mediated GCase degradation leads to functional GCase impairment, subsequent α-synuclein accumulation, and mitochondrial dysfunction in a Parkinson's disease context.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, site-directed mutagenesis (K293), conditional KO/knockdown, α-syn preformed fibril model in vivo\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination with specific lysine mapping, conditional KO with in vivo rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"34644545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIP12 ubiquitylates FBW7 preferentially on K404/K412 via K11-linked branched ubiquitin chains; SCF(FBW7)-mediated ubiquitylation alone is insufficient for proteasomal degradation and requires this additional TRIP12-mediated branched K11 ubiquitylation. TRIP12 inactivation causes FBW7 accumulation and sensitizes cancer cells to anti-tubulin chemotherapy through increased MCL1 degradation.\",\n      \"method\": \"shRNA library screen, mass spectrometry-based ubiquitin site mapping, CRISPR KO, epistasis (FBW7 co-inactivation rescue)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — MS-based site mapping plus genetic epistasis plus functional rescue in multiple cell lines, single lab\",\n      \"pmids\": [\"33824312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WARS (tryptophanyl-tRNA synthetase) tryptophanylates TRIP12 at lysine 1136, activating its E3 ligase activity; activated TRIP12 degrades NFATc1 (a PD-1 transcription activator), thereby downregulating surface PD-1 on CD8+ T cells. SIRT1 de-tryptophanylates TRIP12 and reverses these effects.\",\n      \"method\": \"Mass spectrometry, biochemical analyses, flow cytometry, WARS overexpression, SIRT1 manipulation, in vitro co-culture, syngeneic mouse models\",\n      \"journal\": \"Journal for immunotherapy of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical modification identified by MS with functional rescue experiments, single lab\",\n      \"pmids\": [\"34326168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIP12 expression is cell-cycle regulated and correlates with its nuclear localization. An N-terminal intrinsically disordered region (IDR) mediates euchromatin binding. TRIP12 controls the duration of DNA replication and mitotic entry independently of its catalytic activity, and is required for mitotic progression and chromosome stability.\",\n      \"method\": \"Cell cycle synchronization, immunofluorescence, subcellular fractionation, CRISPR KO, siRNA knockdown, chromosome spread assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional KO readout, multiple methods, single lab\",\n      \"pmids\": [\"31964993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIP12 binds and ubiquitinates the transcription factor YY1, leading to its proteasomal degradation; this TRIP12/YY1 axis controls HNF4α/miR-122/CCL2 signaling and hepatic inflammation under mild iron overload conditions.\",\n      \"method\": \"Immunoprecipitation coupled LC-MS/MS, co-immunoprecipitation, in vivo mouse model, YY1 overexpression/silencing\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — substrate identified by IP-MS and validated by co-IP with functional in vivo rescue, single lab\",\n      \"pmids\": [\"33080340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"p16 overexpression leads to downregulation of TRIP12, which in turn increases RNF168 levels and represses DNA damage repair, increases 53BP1 foci, and enhances radioresponsiveness, placing TRIP12 downstream of p16 in a pathway controlling DDR and radiosensitivity.\",\n      \"method\": \"siRNA knockdown, overexpression, clonogenic survival, western blotting, cycloheximide chase, 53BP1 immunofluorescence, comet assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established by sequential knockdown/overexpression with multiple functional readouts, single lab\",\n      \"pmids\": [\"27425591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Nucleostemin (NS) stabilizes ARF by inhibiting its E3 ligase ULF (TRIP12): NS overexpression suppresses ARF polyubiquitination by ULF and extends ARF half-life, while NS knockdown decreases ARF levels; NS can also enhance NPM-mediated ARF stabilization.\",\n      \"method\": \"Affinity purification/mass spectrometry, co-immunoprecipitation, in vitro and in vivo ubiquitination assays, cycloheximide chase\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interaction identified by AP-MS, validated by co-IP and ubiquitination assay, single lab\",\n      \"pmids\": [\"24769896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIP12 controls TGFβ signalling independently of its E3 ubiquitin ligase catalytic activity: TRIP12 recruits SMURF2 to SMAD4, promoting inhibitory SMAD4 monoubiquitination; loss of TRIP12 robustly activates TGFβ signalling, and rescue with a catalytically inactive C1959A mutant fully restores normal signalling. This function is evolutionarily conserved in Drosophila.\",\n      \"method\": \"CRISPR/Cas9 KO, catalytic mutant rescue, co-immunoprecipitation, 3D organoids, Drosophila genetic epistasis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — catalytic mutant rescue plus co-IP plus genetic epistasis across multiple organisms and model systems, single lab\",\n      \"pmids\": [\"37863914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIP12 is a ubiquitin chain elongation factor that cooperates with CUL3KEAP1 to ensure robust NRF2 degradation; TRIP12 promotes NRF2 turnover during recovery from oxidative stress, limiting NRF2 activation during stress and accelerating stress response silencing as ROS are cleared.\",\n      \"method\": \"CRISPR KO, in vitro ubiquitination assay, NRF2 stability assays, cell death readouts (oxeiptosis), epistasis with CUL3KEAP1\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution plus KO epistasis with defined pathway component, single lab\",\n      \"pmids\": [\"40928944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIP12 ubiquitylates DNA polymerase β (Polβ) in a BER complex-dependent manner, controlling cellular levels and chromatin loading of Polβ; TRIP12, but not its partner UBR5, regulates Polβ foci formation after radiation-induced DNA damage, and excessive TRIP12-mediated Polβ engagement promotes BER precedence over DSB repair, affecting DSB formation and radiation sensitivity.\",\n      \"method\": \"In vitro ubiquitination assay, CRISPR/siRNA KO, chromatin fractionation, immunofluorescence (Polβ foci), clonogenic survival\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination plus KO with functional chromatin-loading and survival readouts, single lab\",\n      \"pmids\": [\"40613707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIP12 ubiquitylates the SWI/SNF component BRG1 in the presence of Wnt, promoting BRG1–β-catenin interaction in the nucleus and recruitment of SWI/SNF to Wnt target genes; genetic epistasis places TRIP12 downstream of the β-catenin destruction complex, and TRIP12 depletion attenuates Wnt signalling in Drosophila, zebrafish, mouse organoids, and human cells.\",\n      \"method\": \"CRISPR/siRNA KO, co-immunoprecipitation, in vitro ubiquitination assay, genetic epistasis across multiple model organisms, luciferase reporter assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro ubiquitination plus reciprocal co-IP plus epistasis replicated across four model systems, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"40473626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIP12 selectively ubiquitinates the third intracellular loop of Frizzled-9b (Fzd9b) at K437, targeting it for lysosomal degradation and reducing Fzd9b surface expression, thereby dampening Wnt9a/Fzd9b signalling and affecting hematopoietic stem cell proliferation in zebrafish.\",\n      \"method\": \"CRISPR/siRNA KO in zebrafish, site-directed mutagenesis (K437), flow cytometry for surface receptor levels, in vivo HSC proliferation assay\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis plus in vivo zebrafish model with functional readout, single lab\",\n      \"pmids\": [\"41098776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"K29-linked ubiquitylation of the H3K9me3 methyltransferase SUV39H1 is catalyzed by TRIP12 and reversed by TRABID; K29-linked ubiquitylation is essential for proteasomal degradation of SUV39H1 even in the presence of K48-linked ubiquitylation, and disruption of this modification deregulates the H3K9me3 landscape.\",\n      \"method\": \"Ubiquitin replacement strategy (cell-based), linkage-specific ubiquitin chain profiling, TRIP12 KO, K29 chain assembly assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — cell-based ubiquitin replacement plus KO with MS-based chain specificity, preprint single lab\",\n      \"pmids\": [\"bio_10.1101_2024.10.29.620783\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIP12 suppresses epithelial-mesenchymal transition (EMT) by inhibiting ZEB1/2 gene expression; TRIP12 depletion causes an EMT shift, loss of cell polarity, increased cellular motility, and ZEB1/2 depletion rescues EMT markers in TRIP12-depleted cells.\",\n      \"method\": \"siRNA depletion, RNA-seq, EMT marker western blotting, cell motility/polarity assays, anoikis assay, epistasis by ZEB1/2 co-depletion\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis by double KD with multiple orthogonal EMT readouts, single lab\",\n      \"pmids\": [\"33963176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIP12 promotes BRD4 degradation by PROTAC-bound CRL2VHL but is dispensable for the degradation of the endogenous CRL2VHL substrate HIF-1α; TRIP12 associates with BRD4 via CRL2VHL and preferentially assembles K29-linked ubiquitin chains. (Replicated finding from PMID:33567268, additional mechanistic detail from a separate paper.)\",\n      \"method\": \"shRNA screen, co-immunoprecipitation, in vitro ubiquitination assay, mass spectrometry\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with linkage-specific MS, replicated across multiple degrader scaffolds\",\n      \"pmids\": [\"33567268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TRIP12 stabilizes HIV-1 Tat independently of its own E3 ligase activity by enhancing the interaction between deubiquitinase USP7 and Tat, thereby reducing K48-linked ubiquitination of Tat and inhibiting its proteasomal degradation; TRIP12 KO reduces USP7–Tat interaction, accelerates Tat degradation, and suppresses viral transcription and latency reactivation.\",\n      \"method\": \"Co-immunoprecipitation, catalytic mutant (E3 ligase-dead) rescue, TRIP12 KO, viral transcription and reactivation assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus catalytic-dead mutant rescue plus KO functional readout, single lab\",\n      \"pmids\": [\"42126234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Small molecule Z363 activates TRIP12, which directly ubiquitinates and degrades MYC (following MYC phosphorylation at Thr58) and also induces degradation of TAF10, indirectly reducing MYC levels; TRIP12 thus controls MYC stability both directly and via TAF10.\",\n      \"method\": \"CRISPR KO, western blotting, cell culture degradation assays, mouse tumor models\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, primarily western blot with no in vitro ubiquitination assay for MYC; mechanistic claim of direct ubiquitination not fully reconstituted\",\n      \"pmids\": [\"36639831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TRIP12's N-terminal intrinsically disordered region (IDR) drives formation of chromatin condensates enriched in heterochromatin marks through electrostatic interactions and bridging-induced phase separation; TRIP12-mediated condensate formation alters cell cycle progression, genome accessibility, and transcription independently of its ubiquitin ligase activity.\",\n      \"method\": \"Overexpression of IDR deletion mutants, live-cell imaging, FRAP, ATAC-seq, RNA-seq, biophysical condensate assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with catalytic-dead mutant, live imaging plus chromatin accessibility readouts, single lab\",\n      \"pmids\": [\"41660270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Ku70 phosphorylation at S155 enhances association with TRIP12; co-immunoprecipitation showed increased TRIP12–Ku70 interaction upon ionizing radiation treatment, suggesting TRIP12 associates with Ku70 in a DNA-damage-dependent manner.\",\n      \"method\": \"BioID2 proximity labeling, proximity ligation assay, co-immunoprecipitation with ionizing radiation treatment\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single proximity labeling screen plus one co-IP validation, single lab, no functional consequence fully established\",\n      \"pmids\": [\"37108203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIP12 is required for pancreatic acinar-to-ductal metaplasia (ADM) and KrasG12D-induced preneoplastic lesion formation in vivo; loss of TRIP12 prevents ADM after pancreatic injury and impairs metastasis in KrasG12D/Trp53R172H mice, while TRIP12 overexpression is required for PDAC cell growth and E2F target gene expression.\",\n      \"method\": \"Genetically modified mouse models (conditional KO, KrasG12D/Trp53R172H), ex vivo acinar explants, PDAC cell lines, western blotting\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vivo mouse genetic models with defined phenotypes, single lab\",\n      \"pmids\": [\"38924548\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIP12 is a HECT-domain E3 ubiquitin ligase that targets a broad array of substrates—including RNF168, PARP1, ARF/p14ARF, UFD-pathway substrates (UBB+1), APP-BP1/NAE1, USP7, GCase, FBW7, BRG1, Fzd9b, SUV39H1, NRF2 (cooperating with CUL3KEAP1), Polβ, NFATc1, and YY1—for polyubiquitination and proteasomal (or lysosomal) degradation, preferentially assembling K29- and K11-linked or branched K29/K48 ubiquitin chains; it also exerts ubiquitin-ligase-independent functions, including scaffolding SMURF2 to SMAD4 to repress TGFβ signalling, promoting USP7-mediated Tat stabilization, and forming chromatin condensates via its N-terminal intrinsically disordered region, collectively placing TRIP12 as a master regulator of DNA damage response, cell cycle progression, protein quality control, Wnt and TGFβ signalling, and genome integrity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRIP12 is a HECT-domain E3 ubiquitin ligase whose catalytic activity is essential for mammalian development and which serves as a master regulator of protein turnover across the DNA damage response, cell cycle, protein quality control, and developmental signalling [#9]. A defining biochemical feature is its ability to assemble atypical and branched ubiquitin chains: it builds K29-linked chains and K29/K48-branched chains that accelerate K48 chain assembly and proteasomal degradation, both on PROTAC neo-substrates recruited via CRL2VHL [#2, #24] and on the H3K9me3 methyltransferase SUV39H1, where K29 linkage is required for degradation even in the presence of K48 chains [#22], and it elongates K11-branched chains on FBW7 to license its destruction [#11]. In genome maintenance, TRIP12 restricts the spread of chromatin ubiquitylation at double-strand breaks by limiting accumulation of the RNF168 E3 ligase [#0], controls steady-state PARP1 levels to limit PARPi-induced PARP1 trapping [#1], and ubiquitylates DNA polymerase \\u03b2 to govern its chromatin loading and the balance between base-excision and double-strand-break repair [#19]. It acts as the human ubiquitin-fusion-degradation (UFD) pathway E3 ligase [#3, #5] and degrades a broad substrate set including the NEDD8-activating enzyme subunit APP-BP1/NAE1 [#4], the deubiquitinase USP7 [#6], the tumour suppressor ARF [#8], glucocerebrosidase [#10], and the transcription factors YY1 and NFATc1 [#12, #14]. TRIP12 also exerts ubiquitin-ligase-independent functions: an N-terminal intrinsically disordered region binds euchromatin and drives chromatin condensate formation that controls cell-cycle progression and genome accessibility [#13, #27], it scaffolds SMURF2 onto SMAD4 to repress TGF\\u03b2 signalling [#17], and it stabilizes HIV-1 Tat by enhancing the USP7\\u2013Tat interaction [#25]. In Wnt signalling it acts downstream of the \\u03b2-catenin destruction complex, ubiquitylating BRG1 to promote SWI/SNF recruitment to target genes while also degrading the receptor Frizzled-9b [#20, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established TRIP12 as a genuine HECT E3 ligase by defining its enzymatic role in the ubiquitin-fusion-degradation pathway and on the neddylation enzyme subunit APP-BP1, anchoring its catalytic function biochemically.\",\n      \"evidence\": \"In vitro ubiquitination with E1/E2/E4, cross-linking, yeast two-hybrid, and siRNA knockdown of UFD substrates and APP-BP1\",\n      \"pmids\": [\"19028681\", \"18627766\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full substrate repertoire and chain-linkage preference not yet defined\", \"Physiological consequences of APP-BP1 stabilization on global neddylation only partially explored\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated that TRIP12 catalytic activity is indispensable in vivo, showing a HECT-domain mutation causes embryonic lethality and linking TRIP12 to SWI/SNF (BAF57) regulation and proliferation.\",\n      \"evidence\": \"Mouse catalytic knock-in model, ES cell phenotyping, gene expression profiling\",\n      \"pmids\": [\"22028794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Critical developmental substrate(s) driving lethality not identified\", \"Mechanism linking TRIP12 to BAF57 levels unresolved at this stage\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Positioned TRIP12 as a brake on the DNA damage response by limiting RNF168 accumulation and thereby restricting the spread of chromatin ubiquitylation and 53BP1/BRCA1 recruitment at breaks.\",\n      \"evidence\": \"siRNA depletion of TRIP12/UBR5, immunofluorescence, DNA damage induction\",\n      \"pmids\": [\"22884692\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chain linkage on RNF168 not defined\", \"Relative contributions of TRIP12 versus UBR5 not separated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined TRIP12 (ULF) as the E3 ligase controlling ARF turnover and the ARF-p53 tumour-suppressor axis, including regulation by TRADD shuttling.\",\n      \"evidence\": \"siRNA knockdown, cycloheximide chase, p53 response assays, mouse TRADD knockout with senescence assays and co-IP\",\n      \"pmids\": [\"20699639\", \"22561347\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ARF ubiquitination by TRIP12 in vitro not shown in these studies\", \"Ubiquitin chain type on ARF undefined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected TRIP12 to checkpoint control by identifying USP7 as a substrate and placing TRIP12 downstream of p16 in regulating RNF168, DDR, and radiosensitivity.\",\n      \"evidence\": \"Co-IP, reciprocal gain/loss-of-function, cell cycle analysis, clonogenic survival, comet assay\",\n      \"pmids\": [\"27800609\", \"27425591\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro ubiquitination assay for USP7\", \"Direct versus indirect effects on p53/53BP1/Chk1 not fully separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed TRIP12 controls PARP1 levels through a WWE-domain PAR-binding mechanism, and uncovered a catalytic-activity-independent chromatin-binding role of its N-terminal IDR in cell-cycle and chromosome stability.\",\n      \"evidence\": \"Co-IP, domain mapping, in vitro ubiquitination, KO viability assays, subcellular fractionation, chromosome spreads\",\n      \"pmids\": [\"32755579\", \"31964993\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chain architecture on PARP1 not characterized\", \"Molecular basis of IDR euchromatin binding not yet structurally defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established TRIP12 as a branched-chain elongation factor that assembles K29-linked and K11/K29/K48-branched ubiquitin chains, accelerating degradation of PROTAC neo-substrates, FBW7, and GCase via lysine-specific modification.\",\n      \"evidence\": \"CRISPR KO, in vitro ubiquitination, linkage-specific mass spectrometry, site-directed mutagenesis, PROTAC degradation and chemosensitization assays\",\n      \"pmids\": [\"33567268\", \"33824312\", \"34644545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of TRIP12 substrate/linkage selectivity unresolved\", \"How branched chains are read by the proteasome not addressed here\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed TRIP12 activity is itself regulated by post-translational modification (WARS-mediated tryptophanylation, reversed by SIRT1) controlling NFATc1 degradation and PD-1 expression on CD8+ T cells.\",\n      \"evidence\": \"Mass spectrometry, biochemistry, flow cytometry, WARS/SIRT1 manipulation, syngeneic mouse models\",\n      \"pmids\": [\"34326168\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of K1136 tryptophanylation-driven activation unknown\", \"Generality of this regulation across other substrates untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined ubiquitin-ligase-independent functions of TRIP12 in TGF\\u03b2 repression by scaffolding SMURF2 onto SMAD4, and established roles in EMT suppression and pancreatic tumourigenesis.\",\n      \"evidence\": \"CRISPR KO with catalytic-dead (C1959A) rescue, co-IP, organoids, Drosophila epistasis; siRNA/RNA-seq EMT assays; conditional KO mouse PDAC models\",\n      \"pmids\": [\"37863914\", \"33963176\", \"38924548\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TRIP12 selects scaffolding versus catalytic modes is unresolved\", \"Mechanism of ZEB1/2 transcriptional repression not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended TRIP12 into developmental Wnt signalling and chromatin-modifier control, ubiquitylating BRG1 to recruit SWI/SNF to Wnt targets, degrading Frizzled-9b, and assembling K29 chains on SUV39H1 to shape the H3K9me3 landscape.\",\n      \"evidence\": \"CRISPR/siRNA KO, in vitro ubiquitination, reciprocal co-IP, site mutagenesis, ubiquitin replacement/linkage profiling, epistasis across Drosophila/zebrafish/mouse/human\",\n      \"pmids\": [\"40473626\", \"41098776\", \"bio_10.1101_2024.10.29.620783\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How Wnt switches TRIP12 between BRG1 stabilization and Fzd9b degradation is unclear\", \"SUV39H1 finding remains a preprint awaiting peer review\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Integrated TRIP12 into oxidative-stress and base-excision-repair control, acting as a chain-elongation factor cooperating with CUL3KEAP1 to degrade NRF2 and ubiquitylating Pol\\u03b2 to govern repair-pathway choice.\",\n      \"evidence\": \"CRISPR KO, in vitro ubiquitination, NRF2 and Pol\\u03b2 stability/chromatin-loading assays, oxeiptosis and clonogenic survival readouts\",\n      \"pmids\": [\"40928944\", \"40613707\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Chain linkage on Pol\\u03b2 not defined\", \"How TRIP12 partitions between CUL3KEAP1 cooperation and independent activity unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Demonstrated that the TRIP12 IDR drives bridging-induced chromatin phase separation controlling genome accessibility and that TRIP12 can stabilize substrates non-catalytically, as for HIV-1 Tat via the USP7\\u2013Tat interaction.\",\n      \"evidence\": \"IDR deletion mutants, FRAP, ATAC-seq, biophysical condensate assays; co-IP with catalytic-dead rescue and viral transcription/reactivation assays\",\n      \"pmids\": [\"41660270\", \"42126234\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological triggers of condensate formation in vivo unclear\", \"How condensate function and ligase function are coordinated remains open\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TRIP12 selects among dozens of substrates and switches between catalytic ubiquitylation, branched-chain elongation, scaffolding, and phase-separation modes remains the central unresolved question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model integrating HECT, WWE, and IDR domains with substrate/linkage choice\", \"Determinants of K29 versus K11 versus branched-chain output undefined\", \"Rules governing catalytic versus non-catalytic engagement unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [3, 1, 2, 11, 10, 22]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 6, 14, 19, 20]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [17, 25]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [13, 27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [13, 7]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [13, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 1, 19]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 5, 11, 2]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [13, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [17, 20, 21]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [22, 27]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"UBR5\", \"PARP1\", \"USP7\", \"SMURF2\", \"SMAD4\", \"FBW7\", \"BRG1\", \"YY1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}