{"gene":"TRIM8","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2002,"finding":"TRIM8/GERP (also known as RNF27) physically interacts with SOCS-1 in vitro and in vivo, and co-expression of TRIM8 with SOCS-1 decreases SOCS-1 protein stability and levels, resulting in decreased repression of interferon-gamma signaling by SOCS-1.","method":"Co-immunoprecipitation (in vitro and in vivo), co-expression functional assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP in vitro and in vivo, functional co-expression assay, single lab with two orthogonal methods","pmids":["12163497"],"is_preprint":false},{"year":2000,"finding":"TRIM8/GERP contains an N-terminal RING finger, two B-boxes, and a coiled-coil domain, placing it in the RBCC subfamily of RING finger proteins, and is expressed in brain, lung, breast, placenta, kidney, muscle, and germinal center B cells.","method":"cDNA cloning, sequence analysis, expression profiling by PCR","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — domain characterization by sequence analysis and expression profiling, single study but foundational structural characterization","pmids":["11118312"],"is_preprint":false},{"year":2010,"finding":"TRIM8 interacts with PIAS3 (protein inhibitor of activated STAT3) and negatively regulates PIAS3 either by proteasomal degradation or by excluding PIAS3 from the nucleus, thereby enhancing STAT3-dependent signaling. Ectopic TRIM8 expression in NIH3T3 cells enhances Src-dependent tumorigenesis.","method":"Co-immunoprecipitation, ubiquitin-proteasome pathway assays, nuclear/cytoplasmic fractionation, focus formation assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional degradation and localization assays, single lab with multiple orthogonal methods","pmids":["20516148"],"is_preprint":false},{"year":2011,"finding":"TRIM8 mediates K63-linked polyubiquitination of TAK1, a serine/threonine kinase essential for TNFα- and IL-1β-induced NF-κB activation. TRIM8 interacts with TAK1 and its overexpression potentiates NF-κB activation, while knockdown has opposite effects.","method":"Co-immunoprecipitation, ubiquitination assay (K63-specific), overexpression and knockdown with NF-κB reporter assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus K63-specific ubiquitination assay, replicated in subsequent independent studies (PMID 27995356, 38430804)","pmids":["22084099"],"is_preprint":false},{"year":2011,"finding":"TRIM8 interacts with Hsp90β, which in turn interacts with STAT3, and TRIM8 modulates nuclear translocation of phosphorylated STAT3 through this interaction, thereby selectively downregulating Nanog transcription in embryonic stem cells. TRIM8 knockdown increased nuclear phospho-STAT3 and enhanced Nanog transcription.","method":"Co-immunoprecipitation, knockdown, nuclear fractionation, qPCR for Nanog","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus functional knockdown with transcriptional readout, single lab","pmids":["21689689"],"is_preprint":false},{"year":2012,"finding":"TRIM8 physically interacts with p53 (by co-immunoprecipitation), impairs p53 interaction with MDM2, induces degradation of MDM2, and stabilizes p53, leading to cell cycle arrest and upregulation of CDKN1A (p21) and GADD45. TRIM8 expression is induced by p53 under stress conditions (UV exposure).","method":"Co-immunoprecipitation, Western blot, cell cycle analysis, gene expression assays (qRT-PCR), TRIM8 knockdown/overexpression","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional assays for MDM2 degradation and p53 stabilization, single lab with multiple orthogonal methods","pmids":["22262183"],"is_preprint":false},{"year":2012,"finding":"TRIM8 undergoes TNF-induced translocation from the nucleus to the cytoplasm, and this cytoplasmic translocation is essential for TNF-induced NF-κB activation (but not p65-mediated NF-κB). TRIM8 negates PIAS3-mediated negative repression of NF-κB at p65 by inducing PIAS3 translocation from nucleus to cytoplasm and its turnover. TRIM8 ubiquitin ligase activity is required for regulation of NF-κB in both cytoplasm and nucleus.","method":"Fluorescence microscopy (live imaging of GFP-TRIM8), domain mutant analysis, nuclear/cytoplasmic fractionation, NF-κB reporter assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional consequence, domain mutants, single lab","pmids":["23152791"],"is_preprint":false},{"year":2017,"finding":"TRIM8 negatively regulates TLR3- and TLR4-mediated innate immune responses by interacting with TRIF (TOLL/IL-1 receptor domain-containing adapter-inducing IFN-β) and mediating K6- and K33-linked polyubiquitination of TRIF, leading to disruption of the TRIF-TBK1 association. TRIM8-knockout mice showed increased susceptibility to poly I:C- and LPS-induced inflammatory death and Salmonella infection.","method":"Trim8 gene-knockout mouse model, co-immunoprecipitation, K6/K33-specific ubiquitination assays, cytokine measurements, in vivo infection models","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse model plus mechanistic Co-IP and specific ubiquitination assays, multiple orthogonal methods in one study","pmids":["28747347"],"is_preprint":false},{"year":2017,"finding":"TRIM8 activates STAT3 signaling to maintain stemness and self-renewal of glioblastoma stem-like cells (GSCs) by suppressing PIAS3 expression through E3-mediated ubiquitination and proteasomal degradation. STAT3 activation also upregulates TRIM8, forming a positive feedback loop.","method":"TRIM8 knockdown and overexpression, Western blot for p-STAT3/PIAS3/stemness markers, sphere-forming assays, immunoprecipitation","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional KD/OE experiments with mechanistic pathway placement, single lab","pmids":["28100038"],"is_preprint":false},{"year":2017,"finding":"TRIM8 reduces levels of the pro-proliferative ΔNp63α protein in both a proteasomal and caspase-1 dependent manner in a p53 wild-type background. ΔNp63α in turn suppresses TRIM8 gene expression by preventing p53-mediated transactivation of TRIM8, forming a negative feedback loop.","method":"Western blot for ΔNp63α degradation, proteasomal and caspase-1 inhibitor assays, TRIM8 overexpression, luciferase reporter for TRIM8 promoter","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — degradation pathway confirmed by pharmacological inhibitors (proteasome + caspase-1), single lab with multiple methods","pmids":["31781486"],"is_preprint":false},{"year":2019,"finding":"TRIM8 protects phosphorylated IRF7 (pIRF7) from proteasomal degradation in human plasmacytoid dendritic cells in an E3 ubiquitin ligase-independent manner by preventing its recognition by the peptidyl-prolyl isomerase Pin1, thereby enabling type I IFN production.","method":"siRNA screen in primary human pDCs, TRIM8 knockdown, co-immunoprecipitation with Pin1, proteasomal degradation assays","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional siRNA screen in primary cells, Co-IP with Pin1, mechanistic proteasome assays; multiple orthogonal methods establishing a novel E3 ligase-independent mechanism","pmids":["31799391"],"is_preprint":false},{"year":2019,"finding":"TRIM8 regulates lysosomal biogenesis and autophagy flux. TRIM8 stabilizes XIAP during genotoxic stress and forms a complex with XIAP and caspase-3 to inhibit caspase-3 activation. TRIM8-mediated autophagy promotes degradation of cleaved caspase-3 subunits, providing cytoprotection during genotoxic stress.","method":"Autophagy flux assays (LC3 turnover), co-immunoprecipitation (TRIM8-XIAP-caspase-3 complex), TRIM8 overexpression/knockdown, etoposide treatment","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for complex identification, autophagy flux assays, and functional caspase-3 inhibition assays, single lab","pmids":["29678622"],"is_preprint":false},{"year":2020,"finding":"TRIM8 interacts with KIF11/Eg5 and KIFC1, two master regulators of mitotic spindle assembly, localizes at the mitotic spindle during mitosis, and plays a role in centrosome separation at the beginning of mitosis, with its depletion causing delayed mitotic progression and chromosomal instability.","method":"Proteomics/interactome in primary mouse embryonic neural stem cells, co-immunoprecipitation, immunofluorescence microscopy during mitosis, TRIM8 knockdown with cell cycle analysis","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP confirmed by proteomics, direct localization imaging, functional KD phenotype, single lab with multiple methods","pmids":["31904480"],"is_preprint":false},{"year":2020,"finding":"POU3F2 transcription factor directly binds to the SCZ-associated SNP rs5011218 in the TRIM8 promoter region (validated by EMSA and luciferase reporter assay), inducing TRIM8 expression. Knockdown of TRIM8 in human neural progenitor cells promoted proliferation, inhibited neuronal differentiation, and impaired excitatory synaptic transmission.","method":"Luciferase reporter assay, EMSA, TRIM8 knockdown in NPCs, electrophysiology (mEPSCs)","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct transcription factor binding validated by EMSA + reporter, functional KD with defined neuronal phenotype, single lab","pmids":["32929213"],"is_preprint":false},{"year":2021,"finding":"TRIM8 functions as an E3 ubiquitin ligase that ubiquitinates EWS/FLI fusion oncoprotein, leading to its degradation. TRIM8 knockout leads to increased EWS/FLI protein levels that are not tolerated (oncogene overdose), making TRIM8 a selective dependency in Ewing sarcoma. This was discovered via CRISPR-Cas9 screening.","method":"CRISPR-Cas9 screen, TRIM8 knockout, ubiquitination assays, protein stability assays, rescue experiments","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide CRISPR screen validated by direct ubiquitination assays and rescue experiments, multiple orthogonal methods","pmids":["34329586"],"is_preprint":false},{"year":2021,"finding":"De novo truncating TRIM8 variants cause mislocalization of the TRIM8 protein from nuclear bodies to diffuse nucleoplasm. Wild-type TRIM8 localizes to nuclear bodies that co-localize with Gemini and Cajal bodies in immortalized human podocytes and neuronal cells; all pathogenic truncations cluster within the C-terminal region (residues 390–487) and result in diffuse nucleoplasmic distribution.","method":"Overexpression of WT and patient-variant TRIM8 constructs in podocyte and neuronal cell lines, fluorescence microscopy, co-localization studies","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment in human cells with multiple patient variants, single study with clean phenotypic readout","pmids":["33508234"],"is_preprint":false},{"year":2020,"finding":"TRIM8 acts as a positive regulator of IFN-γ signaling in macrophages; TRIM8 knockdown in cultured macrophages significantly reduced IFN-γ responsiveness.","method":"siRNA knockdown in macrophages, IFN-γ signaling readouts (gene expression, phospho-STAT1)","journal":"Annals of the rheumatic diseases","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single KD experiment in macrophages, single lab, limited mechanistic detail in abstract","pmids":["33277241"],"is_preprint":false},{"year":2020,"finding":"TRIM8 interacts with ERα via its RING domain in the cytoplasm and increases polyubiquitination of the ERα protein, leading to ERα degradation and suppression of estrogen signaling and breast cancer cell proliferation.","method":"Co-immunoprecipitation, domain mapping (RING domain mutant), ubiquitination assay, RNA sequencing, in vitro and in vivo proliferation assays","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, ubiquitination assay, functional in vivo rescue, single lab","pmids":["33163282"],"is_preprint":false},{"year":2024,"finding":"TRIB3 directly interacts with HNF4α and recruits TRIM8 to form an E3 ligase complex that catalyzes K48-linked polyubiquitination of HNF4α at lysine 470, leading to proteasomal degradation of HNF4α during ER stress and NAFLD progression.","method":"Co-immunoprecipitation, mass spectrometry, in vivo and in vitro ubiquitination assays, site-specific mutagenesis (K470), RNA sequencing","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro and in vivo ubiquitination assays with site-specific mutagenesis, Co-IP validated by mass spectrometry, multiple orthogonal methods","pmids":["38237865"],"is_preprint":false},{"year":2023,"finding":"TRIM21 and TRIM8 directly mutually regulate each other via K48-linked ubiquitination, activating the proteasome pathway for each other's degradation in lung and renal cancer cells.","method":"Co-immunoprecipitation, K48-specific ubiquitination assays, overexpression/knockdown experiments","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and K48-specific ubiquitination assays, single lab","pmids":["37914816"],"is_preprint":false},{"year":2024,"finding":"TRIM8 interacts with VDAC2 and promotes its K48-linked polyubiquitination and proteasomal degradation, increasing ovarian cancer cell resistance to ferroptosis and promoting proliferation and migration.","method":"Co-immunoprecipitation, mass spectrometry, Western blot, ubiquitination assay, xenograft mouse model","journal":"Cancer medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay, in vivo xenograft, single lab","pmids":["38881325"],"is_preprint":false},{"year":2025,"finding":"TRIM8 promotes K63-linked ubiquitination of glycolytic enzyme PGK1, improving PGK1 stability, which leads to ACAT1 recruitment and subsequent PGK1 acetylation-dependent glycolytic activity, facilitating lactate accumulation and tumor angiogenesis in gastric cancer.","method":"Co-immunoprecipitation, K63-specific ubiquitination assay, acetylation assays, tube formation and endothelial migration assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus K63-specific ubiquitination and acetylation assays, functional angiogenesis assays, single lab","pmids":["41184227"],"is_preprint":false},{"year":2025,"finding":"TRIM8 facilitates K48-linked ubiquitin-proteasome degradation of YTHDF2 via its RING domain, which inhibits YTHDF2-m6A-mediated SREBF2 mRNA degradation, thereby upregulating SREBF2 and enhancing chondrocyte ferroptosis in osteoarthritis.","method":"Co-immunoprecipitation, RING domain mutant, ubiquitination assay, m6A-YTHDF2 pathway assays, TRIM8 KD in OA mouse model","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mutant, ubiquitination assay, in vivo OA model, single lab","pmids":["40073810"],"is_preprint":false},{"year":2025,"finding":"TRIM8 promotes K48-linked ubiquitin-proteasome degradation of the PEDV nucleocapsid (N) protein via interaction with the coiled-coil domain of TRIM8, inhibiting PEDV replication in a dose-dependent manner.","method":"Co-immunoprecipitation, TRIM8 knockout/overexpression cell lines, K48-specific ubiquitination assays, TRIM8 domain mapping","journal":"Veterinary research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping plus K48-specific ubiquitination assay, KO/OE functional readout, single lab","pmids":["39819815"],"is_preprint":false},{"year":2025,"finding":"TRIM8 promotes K48-linked ubiquitination of MYOF (myoferlin), facilitating its proteasomal degradation, thereby suppressing extracellular MMP secretion, cell migration, and lung cancer metastasis.","method":"Co-immunoprecipitation, K48-specific ubiquitination assay, gain-/loss-of-function experiments, xenograft model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus K48-specific ubiquitination assay, in vivo xenograft rescue, single lab","pmids":["39934162"],"is_preprint":false},{"year":2025,"finding":"Endogenous TRIM8 localizes as a novel ciliary protein co-localizing with CEP170 at the centrosomal region throughout all mitotic phases. TRIM8 depletion results in reduced number of ciliated cells and shorter cilia in ARPE-19 cells, and perturbs the 'Cell Cycle Control of Chromosomal Replication' pathway. TRIM8 negatively regulates TOP2A expression.","method":"scRNA-seq, proteomics (LC-MS/MS), polysome profiling with RNA-seq, immunofluorescence microscopy, TRIM8 knockdown","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by immunofluorescence confirmed by multi-omics, functional KD with defined cilia phenotype, single lab","pmids":["41057298"],"is_preprint":false},{"year":2025,"finding":"Disease-causing C-terminal truncations of TRIM8 disrupt its condensate formation, impair proteasomal regulation, and disrupt TAK1/NF-κB signaling; functional assays in cellular and animal models link these disruptions to podocyte dysfunction and impaired response to injury.","method":"Systematic mesoscale localization screen (72 TRIM proteins), condensate formation assays, proteasomal regulation assays, NF-κB signaling assays, podocyte functional models, animal models","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays in cellular and animal models; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2024,"finding":"TRIM8 ubiquitinates and degrades SOCS1 in cervical cancer cells, promoting cancer cell proliferation, invasion, and migration; inhibition of SOCS1 partially reverses the effects of TRIM8 knockdown.","method":"Protein immunoprecipitation, ubiquitination assay (MG132 treatment), CCK-8/colony formation/Transwell assays, rescue experiments with si-SOCS1","journal":"Biochemical genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay with proteasome inhibitor, functional rescue experiment, single lab","pmids":["38918306"],"is_preprint":false},{"year":2022,"finding":"TRIM8 interacts with GPX1 (glutathione peroxidase 1) and promotes GPX1 ubiquitination and degradation, negatively regulating antioxidant defense in cardiomyocytes during ischemia/reperfusion injury.","method":"Co-immunoprecipitation, ubiquitination assay, TRIM8 overexpression/knockdown, in vitro I/R model and in vivo rat model","journal":"Pharmaceutical biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay, in vivo rat validation, single lab","pmids":["35968584"],"is_preprint":false},{"year":2025,"finding":"ITLN1 antagonizes TRIM8-mediated K48-linked ubiquitination and degradation of CAPN2 (calpain-2) by binding TRIM8, thereby stabilizing CAPN2 and promoting ZBP1-dependent PANoptosis in intestinal epithelial cells in Crohn's disease.","method":"Co-immunoprecipitation combined with mass spectrometry, RNA-seq, ubiquitination assays, rescue experiments, IL-10 KO colitis mouse model","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identification, ubiquitination assays, functional rescue, in vivo KO model, single study","pmids":["40520022"],"is_preprint":false},{"year":2024,"finding":"TRIM8 inhibits DUSP14, promoting MAPKs pathway activation, leading to adipocyte inflammation and insulin resistance; TRIM8 deficiency decreased inflammatory cytokines and improved insulin signaling, effects reversed by DUSP14 knockdown.","method":"TRIM8 knockdown/overexpression, DUSP14 knockdown/overexpression, cytokine measurements, glucose uptake assay, Western blot for insulin signaling","journal":"Adipocyte","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional rescue experiments placing TRIM8 upstream of DUSP14/MAPKs, but no direct binding or ubiquitination data shown, single lab","pmids":["39039652"],"is_preprint":false}],"current_model":"TRIM8 is a RING finger-containing E3 ubiquitin ligase that operates at the intersection of NF-κB, p53, and JAK-STAT signaling: it promotes K63-linked polyubiquitination and activation of TAK1 to potentiate NF-κB responses, while also targeting TRIF for K6/K33-linked ubiquitination to terminate TLR3/4 signaling; it stabilizes p53 by physically interacting with it, degrading MDM2, and reducing ΔNp63α; it promotes STAT3 signaling by ubiquitinating and degrading the STAT3 inhibitor PIAS3 or by modulating STAT3 nuclear transport via Hsp90β; it protects phospho-IRF7 from Pin1-mediated proteasomal destruction in plasmacytoid dendritic cells in an E3-independent manner; it ubiquitinates and degrades SOCS-1, EWS/FLI, ERα, VDAC2, MYOF, YTHDF2, GPX1, and CAPN2 via K48-linked polyubiquitination; it promotes K63-linked ubiquitination of PGK1 to drive glycolysis-dependent angiogenesis; it localizes to nuclear bodies in a C-terminus-dependent manner, and to the mitotic spindle and centrosome/ciliary base, where it regulates bipolar spindle formation, chromosomal stability, and ciliogenesis."},"narrative":{"mechanistic_narrative":"TRIM8 is a RING finger E3 ubiquitin ligase of the RBCC/TRIM family that governs protein stability across innate immune, transcriptional, and cell-cycle programs by directing substrate-selective polyubiquitination [PMID:11118312, PMID:34329586]. In innate immunity it acts bidirectionally: it potentiates NF-κB signaling by mediating K63-linked polyubiquitination of the kinase TAK1, with cytoplasmic translocation of TRIM8 required for this activation [PMID:22084099, PMID:23152791]; conversely it restrains TLR3/TLR4 responses by catalyzing K6/K33-linked ubiquitination of TRIF to disrupt the TRIF-TBK1 association, and Trim8-knockout mice show heightened susceptibility to endotoxin and Salmonella [PMID:28747347]. TRIM8 also reinforces STAT3-dependent signaling by ubiquitinating and degrading the STAT3 inhibitor PIAS3, forming a positive feedback loop that sustains glioblastoma stem-cell self-renewal, and modulates phospho-STAT3 nuclear transport through Hsp90β [PMID:20516148, PMID:28100038, PMID:21689689]. Through physical interaction with p53 it impairs the p53-MDM2 association, drives MDM2 degradation, and stabilizes p53 to enforce cell-cycle arrest, while itself being a p53-induced gene [PMID:22262183]. The bulk of its characterized targets are degraded via K48-linked polyubiquitination—including the EWS/FLI fusion oncoprotein (making TRIM8 a selective dependency in Ewing sarcoma), HNF4α (recruited by TRIB3 during NAFLD), ERα, VDAC2, MYOF, YTHDF2, GPX1, SOCS1, and CAPN2—linking TRIM8 to oncogenic protein turnover, ferroptosis, and antioxidant defense [PMID:34329586, PMID:38237865, PMID:33163282, PMID:38881325, PMID:39934162, PMID:40073810, PMID:35968584, PMID:38918306, PMID:40520022]. A non-catalytic mode also exists: in plasmacytoid dendritic cells TRIM8 protects phospho-IRF7 from Pin1-mediated proteasomal destruction in an E3-independent manner to enable type I IFN production [PMID:31799391]. TRIM8 localizes to nuclear bodies in a C-terminus-dependent manner and to the mitotic spindle and centrosome/ciliary base, where it interacts with KIF11/Eg5 and KIFC1 to control centrosome separation, spindle bipolarity, chromosomal stability, and ciliogenesis [PMID:33508234, PMID:31904480, PMID:41057298]. De novo C-terminal truncating variants mislocalize TRIM8 from nuclear bodies to diffuse nucleoplasm, defining a human disease mechanism affecting podocyte and neuronal function [PMID:33508234].","teleology":[{"year":2002,"claim":"Established TRIM8 as a regulator of cytokine signaling by showing it destabilizes a key negative regulator, the first functional readout for the protein.","evidence":"Reciprocal Co-IP in vitro and in vivo plus co-expression functional assay showing TRIM8 decreases SOCS-1 stability and relieves IFN-γ repression","pmids":["12163497"],"confidence":"Medium","gaps":["Ubiquitin-linkage type not defined","RING-dependence of SOCS-1 turnover not established in this study"]},{"year":2010,"claim":"Defined a STAT3-promoting mode by identifying PIAS3 as a TRIM8 target whose loss enhances STAT3 signaling and supports transformation.","evidence":"Co-IP, proteasome-pathway assays, nuclear/cytoplasmic fractionation, and focus-formation assay in NIH3T3 cells","pmids":["20516148"],"confidence":"Medium","gaps":["Whether regulation is degradation versus nuclear exclusion left ambiguous","Ubiquitin-linkage specificity not resolved"]},{"year":2011,"claim":"Identified the catalytic basis for TRIM8's NF-κB activation by showing K63-linked ubiquitination of the upstream kinase TAK1.","evidence":"Co-IP, K63-specific ubiquitination assay, and overexpression/knockdown with NF-κB reporters","pmids":["22084099"],"confidence":"High","gaps":["Ubiquitin acceptor lysines on TAK1 not mapped","Signal-dependent regulation of TRIM8 activity not defined here"]},{"year":2012,"claim":"Connected TRIM8 to the p53 tumor-suppressor axis, showing it stabilizes p53 by degrading MDM2 and is itself a p53 stress-response target.","evidence":"Co-IP, Western blot for MDM2 degradation, cell-cycle analysis, and qRT-PCR of p53 targets after UV stress","pmids":["22262183"],"confidence":"Medium","gaps":["Direct MDM2 ubiquitination by TRIM8 not demonstrated","Linkage type on MDM2 unknown"]},{"year":2012,"claim":"Showed that subcellular relocation gates TRIM8 function, with TNF-induced nuclear-to-cytoplasmic translocation required for NF-κB activation.","evidence":"Live GFP-TRIM8 imaging, domain-mutant analysis, fractionation, and NF-κB reporters","pmids":["23152791"],"confidence":"Medium","gaps":["Trigger and machinery for translocation unknown","Relationship to TAK1 ubiquitination not integrated"]},{"year":2017,"claim":"Resolved a context-dependent immune role: TRIM8 negatively regulates TLR3/4 signaling by atypical K6/K33 ubiquitination of TRIF, validated by knockout-mouse phenotypes.","evidence":"Trim8-knockout mice, Co-IP, K6/K33-specific ubiquitination assays, and in vivo infection/inflammation models","pmids":["28747347"],"confidence":"High","gaps":["How TRIM8 switches between NF-κB activation and TLR restraint not defined","TRIF acceptor lysines not mapped"]},{"year":2017,"claim":"Placed TRIM8 in cancer stemness through a STAT3-PIAS3 positive feedback loop sustaining glioblastoma stem-like cells.","evidence":"TRIM8 KD/OE, Western blots for p-STAT3/PIAS3/stemness markers, sphere-forming assays, and immunoprecipitation","pmids":["28100038"],"confidence":"Medium","gaps":["PIAS3 ubiquitin-linkage type not specified","Generality beyond GSCs untested in this study"]},{"year":2017,"claim":"Extended the p53 network by showing TRIM8 lowers pro-proliferative ΔNp63α in a reciprocal negative feedback loop.","evidence":"Western blot of ΔNp63α, proteasome and caspase-1 inhibitor assays, and TRIM8 promoter luciferase reporter","pmids":["31781486"],"confidence":"Medium","gaps":["Direct ubiquitination of ΔNp63α not shown","Role of caspase-1 versus proteasome not fully separated"]},{"year":2018,"claim":"Revealed a cytoprotective role linking TRIM8 to autophagy and apoptosis control during genotoxic stress.","evidence":"LC3-turnover autophagy flux assays, Co-IP of a TRIM8-XIAP-caspase-3 complex, and etoposide treatment with KD/OE","pmids":["29678622"],"confidence":"Medium","gaps":["Whether TRIM8 ubiquitinates XIAP or caspase-3 directly unclear","Mechanism of lysosomal/autophagy regulation undefined"]},{"year":2019,"claim":"Uncovered an E3-independent function: TRIM8 shields phospho-IRF7 from Pin1-driven degradation to license type I IFN in pDCs.","evidence":"siRNA screen in primary human pDCs, Co-IP with Pin1, and proteasomal degradation assays","pmids":["31799391"],"confidence":"High","gaps":["Structural basis of pIRF7 protection not defined","Whether the RING is dispensable in other contexts unknown"]},{"year":2020,"claim":"Defined a mitotic structural role, placing TRIM8 at the spindle/centrosome through interactions with spindle motors and linking it to chromosomal stability.","evidence":"Interactome proteomics in neural stem cells, Co-IP with KIF11/KIFC1, mitotic immunofluorescence, and KD cell-cycle analysis","pmids":["31904480"],"confidence":"Medium","gaps":["Whether spindle regulation requires E3 activity unknown","Motor substrates of TRIM8 ubiquitination not identified"]},{"year":2020,"claim":"Linked TRIM8 to neurodevelopment and schizophrenia risk via promoter regulation by POU3F2 and effects on neural progenitor differentiation.","evidence":"Luciferase reporter, EMSA at SNP rs5011218, TRIM8 KD in NPCs, and mEPSC electrophysiology","pmids":["32929213"],"confidence":"Medium","gaps":["Downstream TRIM8 effectors in neurons not identified","Single-lab functional readouts"]},{"year":2021,"claim":"Identified TRIM8 as a selective Ewing sarcoma dependency by degrading the EWS/FLI fusion oncoprotein to prevent oncogene overdose.","evidence":"CRISPR-Cas9 screen, TRIM8 knockout, ubiquitination and protein-stability assays, and rescue experiments","pmids":["34329586"],"confidence":"High","gaps":["EWS/FLI ubiquitin acceptor sites not mapped","Generalizability to other fusion oncoproteins untested"]},{"year":2021,"claim":"Established the human disease mechanism by showing C-terminal truncating variants mislocalize TRIM8 from nuclear bodies to diffuse nucleoplasm.","evidence":"Overexpression of WT and patient-variant constructs in podocytes and neuronal cells with co-localization microscopy","pmids":["33508234"],"confidence":"Medium","gaps":["Functional consequence of mislocalization on substrate ubiquitination not measured","Nuclear-body composition incompletely defined"]},{"year":2023,"claim":"Showed TRIM8 participates in reciprocal E3-E3 cross-regulation, being degraded by and degrading TRIM21 in cancer cells.","evidence":"Reciprocal Co-IP and K48-specific ubiquitination assays with KD/OE in lung and renal cancer cells","pmids":["37914816"],"confidence":"Medium","gaps":["Physiological trigger for the mutual degradation unknown","Single-lab observation"]},{"year":2024,"claim":"Demonstrated adaptor-directed substrate selection, with TRIB3 recruiting TRIM8 to degrade HNF4α via site-specific K48 ubiquitination during NAFLD.","evidence":"Co-IP/MS, in vitro and in vivo ubiquitination assays, and K470 site-specific mutagenesis","pmids":["38237865"],"confidence":"High","gaps":["Whether other adaptors redirect TRIM8 substrate choice unknown","Regulation of TRIB3-TRIM8 complex assembly undefined"]},{"year":2024,"claim":"Broadened the K48-degradation substrate set into cancer metabolism and ferroptosis (VDAC2, SOCS1) supporting tumor cell survival and proliferation.","evidence":"Co-IP/MS, ubiquitination assays, functional rescue, and xenograft models across ovarian and cervical cancer","pmids":["38881325","38918306"],"confidence":"Medium","gaps":["Acceptor lysines not mapped","Context-specificity of substrate engagement unclear"]},{"year":2025,"claim":"Consolidated TRIM8 as a broad K48-ligase across antiviral defense and disease (PEDV N protein, MYOF, YTHDF2, GPX1, CAPN2) and as a K63-ligase promoting PGK1-driven glycolytic angiogenesis.","evidence":"Co-IP with domain mapping, linkage-specific ubiquitination assays, and in vivo/functional models across multiple tissues","pmids":["39819815","39934162","40073810","35968584","40520022","41184227"],"confidence":"Medium","gaps":["Determinants of K48-versus-K63 linkage choice across substrates undefined","Most substrates established by single labs"]},{"year":2025,"claim":"Refined the mitotic/ciliary localization by placing endogenous TRIM8 with CEP170 at the centrosome throughout mitosis and linking depletion to ciliogenesis defects and TOP2A regulation.","evidence":"scRNA-seq, LC-MS/MS proteomics, polysome profiling, immunofluorescence, and KD in ARPE-19 cells","pmids":["41057298"],"confidence":"Medium","gaps":["Whether ciliary function requires ubiquitin ligase activity unknown","Direct ciliary substrates not identified"]},{"year":null,"claim":"How TRIM8 selects among its many K48 versus K63 substrates and switches between catalytic and E3-independent (e.g. pIRF7-protective) modes, and how C-terminal condensate/nuclear-body integrity controls these activities, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model for linkage-type or substrate selection","Structural basis of condensate formation and its functional output undefined","In vivo hierarchy among competing substrate pathways unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[3,7,14,17,18,20,21,22,24]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,3,7,14,17,18,20,24,27,28]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[3,14,17,18]},{"term_id":"GO:0098772","term_label":"molecular function regulator 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Participates in the activation of interferon-gamma signaling by promoting proteasomal degradation of the repressor SOCS1 (PubMed:12163497). Plays a positive role in the TNFalpha and IL-1beta signaling pathways. Mechanistically, induces the 'Lys-63'-linked polyubiquitination of MAP3K7/TAK1 component leading to the activation of NF-kappa-B (PubMed:22084099, PubMed:23152791, PubMed:27981609, PubMed:34871740). Also modulates STAT3 activity through negative regulation of PIAS3, either by degradation of PIAS3 through the ubiquitin-proteasome pathway or exclusion of PIAS3 from the nucleus (PubMed:20516148). Negatively regulates TLR3/4-mediated innate immune response by catalyzing 'Lys-6'- and 'Lys-33'-linked polyubiquitination of TICAM1 and thereby disrupting the TICAM1-TBK1 interaction (PubMed:28747347)","subcellular_location":"Cytoplasm; Nucleus; Nucleus, nuclear body","url":"https://www.uniprot.org/uniprotkb/Q9BZR9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRIM8","classification":"Not Classified","n_dependent_lines":21,"n_total_lines":1208,"dependency_fraction":0.0173841059602649},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"MIF","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TRIM8","total_profiled":1310},"omim":[{"mim_id":"619428","title":"FOCAL SEGMENTAL GLOMERULOSCLEROSIS AND NEURODEVELOPMENTAL SYNDROME; FSGSNEDS","url":"https://www.omim.org/entry/619428"},{"mim_id":"606125","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 8; TRIM8","url":"https://www.omim.org/entry/606125"},{"mim_id":"603597","title":"SUPPRESSOR OF CYTOKINE SIGNALING 1; SOCS1","url":"https://www.omim.org/entry/603597"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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co-expression functional assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP in vitro and in vivo, functional co-expression assay, single lab with two orthogonal methods\",\n      \"pmids\": [\"12163497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TRIM8/GERP contains an N-terminal RING finger, two B-boxes, and a coiled-coil domain, placing it in the RBCC subfamily of RING finger proteins, and is expressed in brain, lung, breast, placenta, kidney, muscle, and germinal center B cells.\",\n      \"method\": \"cDNA cloning, sequence analysis, expression profiling by PCR\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — domain characterization by sequence analysis and expression profiling, single study but foundational structural characterization\",\n      \"pmids\": [\"11118312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRIM8 interacts with PIAS3 (protein inhibitor of activated STAT3) and negatively regulates PIAS3 either by proteasomal degradation or by excluding PIAS3 from the nucleus, thereby enhancing STAT3-dependent signaling. Ectopic TRIM8 expression in NIH3T3 cells enhances Src-dependent tumorigenesis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitin-proteasome pathway assays, nuclear/cytoplasmic fractionation, focus formation assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional degradation and localization assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20516148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRIM8 mediates K63-linked polyubiquitination of TAK1, a serine/threonine kinase essential for TNFα- and IL-1β-induced NF-κB activation. TRIM8 interacts with TAK1 and its overexpression potentiates NF-κB activation, while knockdown has opposite effects.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay (K63-specific), overexpression and knockdown with NF-κB reporter assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus K63-specific ubiquitination assay, replicated in subsequent independent studies (PMID 27995356, 38430804)\",\n      \"pmids\": [\"22084099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRIM8 interacts with Hsp90β, which in turn interacts with STAT3, and TRIM8 modulates nuclear translocation of phosphorylated STAT3 through this interaction, thereby selectively downregulating Nanog transcription in embryonic stem cells. TRIM8 knockdown increased nuclear phospho-STAT3 and enhanced Nanog transcription.\",\n      \"method\": \"Co-immunoprecipitation, knockdown, nuclear fractionation, qPCR for Nanog\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus functional knockdown with transcriptional readout, single lab\",\n      \"pmids\": [\"21689689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRIM8 physically interacts with p53 (by co-immunoprecipitation), impairs p53 interaction with MDM2, induces degradation of MDM2, and stabilizes p53, leading to cell cycle arrest and upregulation of CDKN1A (p21) and GADD45. TRIM8 expression is induced by p53 under stress conditions (UV exposure).\",\n      \"method\": \"Co-immunoprecipitation, Western blot, cell cycle analysis, gene expression assays (qRT-PCR), TRIM8 knockdown/overexpression\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional assays for MDM2 degradation and p53 stabilization, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22262183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRIM8 undergoes TNF-induced translocation from the nucleus to the cytoplasm, and this cytoplasmic translocation is essential for TNF-induced NF-κB activation (but not p65-mediated NF-κB). TRIM8 negates PIAS3-mediated negative repression of NF-κB at p65 by inducing PIAS3 translocation from nucleus to cytoplasm and its turnover. TRIM8 ubiquitin ligase activity is required for regulation of NF-κB in both cytoplasm and nucleus.\",\n      \"method\": \"Fluorescence microscopy (live imaging of GFP-TRIM8), domain mutant analysis, nuclear/cytoplasmic fractionation, NF-κB reporter assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional consequence, domain mutants, single lab\",\n      \"pmids\": [\"23152791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRIM8 negatively regulates TLR3- and TLR4-mediated innate immune responses by interacting with TRIF (TOLL/IL-1 receptor domain-containing adapter-inducing IFN-β) and mediating K6- and K33-linked polyubiquitination of TRIF, leading to disruption of the TRIF-TBK1 association. TRIM8-knockout mice showed increased susceptibility to poly I:C- and LPS-induced inflammatory death and Salmonella infection.\",\n      \"method\": \"Trim8 gene-knockout mouse model, co-immunoprecipitation, K6/K33-specific ubiquitination assays, cytokine measurements, in vivo infection models\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse model plus mechanistic Co-IP and specific ubiquitination assays, multiple orthogonal methods in one study\",\n      \"pmids\": [\"28747347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRIM8 activates STAT3 signaling to maintain stemness and self-renewal of glioblastoma stem-like cells (GSCs) by suppressing PIAS3 expression through E3-mediated ubiquitination and proteasomal degradation. STAT3 activation also upregulates TRIM8, forming a positive feedback loop.\",\n      \"method\": \"TRIM8 knockdown and overexpression, Western blot for p-STAT3/PIAS3/stemness markers, sphere-forming assays, immunoprecipitation\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional KD/OE experiments with mechanistic pathway placement, single lab\",\n      \"pmids\": [\"28100038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRIM8 reduces levels of the pro-proliferative ΔNp63α protein in both a proteasomal and caspase-1 dependent manner in a p53 wild-type background. ΔNp63α in turn suppresses TRIM8 gene expression by preventing p53-mediated transactivation of TRIM8, forming a negative feedback loop.\",\n      \"method\": \"Western blot for ΔNp63α degradation, proteasomal and caspase-1 inhibitor assays, TRIM8 overexpression, luciferase reporter for TRIM8 promoter\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — degradation pathway confirmed by pharmacological inhibitors (proteasome + caspase-1), single lab with multiple methods\",\n      \"pmids\": [\"31781486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM8 protects phosphorylated IRF7 (pIRF7) from proteasomal degradation in human plasmacytoid dendritic cells in an E3 ubiquitin ligase-independent manner by preventing its recognition by the peptidyl-prolyl isomerase Pin1, thereby enabling type I IFN production.\",\n      \"method\": \"siRNA screen in primary human pDCs, TRIM8 knockdown, co-immunoprecipitation with Pin1, proteasomal degradation assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional siRNA screen in primary cells, Co-IP with Pin1, mechanistic proteasome assays; multiple orthogonal methods establishing a novel E3 ligase-independent mechanism\",\n      \"pmids\": [\"31799391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM8 regulates lysosomal biogenesis and autophagy flux. TRIM8 stabilizes XIAP during genotoxic stress and forms a complex with XIAP and caspase-3 to inhibit caspase-3 activation. TRIM8-mediated autophagy promotes degradation of cleaved caspase-3 subunits, providing cytoprotection during genotoxic stress.\",\n      \"method\": \"Autophagy flux assays (LC3 turnover), co-immunoprecipitation (TRIM8-XIAP-caspase-3 complex), TRIM8 overexpression/knockdown, etoposide treatment\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for complex identification, autophagy flux assays, and functional caspase-3 inhibition assays, single lab\",\n      \"pmids\": [\"29678622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM8 interacts with KIF11/Eg5 and KIFC1, two master regulators of mitotic spindle assembly, localizes at the mitotic spindle during mitosis, and plays a role in centrosome separation at the beginning of mitosis, with its depletion causing delayed mitotic progression and chromosomal instability.\",\n      \"method\": \"Proteomics/interactome in primary mouse embryonic neural stem cells, co-immunoprecipitation, immunofluorescence microscopy during mitosis, TRIM8 knockdown with cell cycle analysis\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP confirmed by proteomics, direct localization imaging, functional KD phenotype, single lab with multiple methods\",\n      \"pmids\": [\"31904480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"POU3F2 transcription factor directly binds to the SCZ-associated SNP rs5011218 in the TRIM8 promoter region (validated by EMSA and luciferase reporter assay), inducing TRIM8 expression. Knockdown of TRIM8 in human neural progenitor cells promoted proliferation, inhibited neuronal differentiation, and impaired excitatory synaptic transmission.\",\n      \"method\": \"Luciferase reporter assay, EMSA, TRIM8 knockdown in NPCs, electrophysiology (mEPSCs)\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct transcription factor binding validated by EMSA + reporter, functional KD with defined neuronal phenotype, single lab\",\n      \"pmids\": [\"32929213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM8 functions as an E3 ubiquitin ligase that ubiquitinates EWS/FLI fusion oncoprotein, leading to its degradation. TRIM8 knockout leads to increased EWS/FLI protein levels that are not tolerated (oncogene overdose), making TRIM8 a selective dependency in Ewing sarcoma. This was discovered via CRISPR-Cas9 screening.\",\n      \"method\": \"CRISPR-Cas9 screen, TRIM8 knockout, ubiquitination assays, protein stability assays, rescue experiments\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide CRISPR screen validated by direct ubiquitination assays and rescue experiments, multiple orthogonal methods\",\n      \"pmids\": [\"34329586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"De novo truncating TRIM8 variants cause mislocalization of the TRIM8 protein from nuclear bodies to diffuse nucleoplasm. Wild-type TRIM8 localizes to nuclear bodies that co-localize with Gemini and Cajal bodies in immortalized human podocytes and neuronal cells; all pathogenic truncations cluster within the C-terminal region (residues 390–487) and result in diffuse nucleoplasmic distribution.\",\n      \"method\": \"Overexpression of WT and patient-variant TRIM8 constructs in podocyte and neuronal cell lines, fluorescence microscopy, co-localization studies\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment in human cells with multiple patient variants, single study with clean phenotypic readout\",\n      \"pmids\": [\"33508234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM8 acts as a positive regulator of IFN-γ signaling in macrophages; TRIM8 knockdown in cultured macrophages significantly reduced IFN-γ responsiveness.\",\n      \"method\": \"siRNA knockdown in macrophages, IFN-γ signaling readouts (gene expression, phospho-STAT1)\",\n      \"journal\": \"Annals of the rheumatic diseases\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single KD experiment in macrophages, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"33277241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM8 interacts with ERα via its RING domain in the cytoplasm and increases polyubiquitination of the ERα protein, leading to ERα degradation and suppression of estrogen signaling and breast cancer cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping (RING domain mutant), ubiquitination assay, RNA sequencing, in vitro and in vivo proliferation assays\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, ubiquitination assay, functional in vivo rescue, single lab\",\n      \"pmids\": [\"33163282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIB3 directly interacts with HNF4α and recruits TRIM8 to form an E3 ligase complex that catalyzes K48-linked polyubiquitination of HNF4α at lysine 470, leading to proteasomal degradation of HNF4α during ER stress and NAFLD progression.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, in vivo and in vitro ubiquitination assays, site-specific mutagenesis (K470), RNA sequencing\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro and in vivo ubiquitination assays with site-specific mutagenesis, Co-IP validated by mass spectrometry, multiple orthogonal methods\",\n      \"pmids\": [\"38237865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM21 and TRIM8 directly mutually regulate each other via K48-linked ubiquitination, activating the proteasome pathway for each other's degradation in lung and renal cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, K48-specific ubiquitination assays, overexpression/knockdown experiments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and K48-specific ubiquitination assays, single lab\",\n      \"pmids\": [\"37914816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM8 interacts with VDAC2 and promotes its K48-linked polyubiquitination and proteasomal degradation, increasing ovarian cancer cell resistance to ferroptosis and promoting proliferation and migration.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, Western blot, ubiquitination assay, xenograft mouse model\",\n      \"journal\": \"Cancer medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay, in vivo xenograft, single lab\",\n      \"pmids\": [\"38881325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM8 promotes K63-linked ubiquitination of glycolytic enzyme PGK1, improving PGK1 stability, which leads to ACAT1 recruitment and subsequent PGK1 acetylation-dependent glycolytic activity, facilitating lactate accumulation and tumor angiogenesis in gastric cancer.\",\n      \"method\": \"Co-immunoprecipitation, K63-specific ubiquitination assay, acetylation assays, tube formation and endothelial migration assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus K63-specific ubiquitination and acetylation assays, functional angiogenesis assays, single lab\",\n      \"pmids\": [\"41184227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM8 facilitates K48-linked ubiquitin-proteasome degradation of YTHDF2 via its RING domain, which inhibits YTHDF2-m6A-mediated SREBF2 mRNA degradation, thereby upregulating SREBF2 and enhancing chondrocyte ferroptosis in osteoarthritis.\",\n      \"method\": \"Co-immunoprecipitation, RING domain mutant, ubiquitination assay, m6A-YTHDF2 pathway assays, TRIM8 KD in OA mouse model\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mutant, ubiquitination assay, in vivo OA model, single lab\",\n      \"pmids\": [\"40073810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM8 promotes K48-linked ubiquitin-proteasome degradation of the PEDV nucleocapsid (N) protein via interaction with the coiled-coil domain of TRIM8, inhibiting PEDV replication in a dose-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, TRIM8 knockout/overexpression cell lines, K48-specific ubiquitination assays, TRIM8 domain mapping\",\n      \"journal\": \"Veterinary research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping plus K48-specific ubiquitination assay, KO/OE functional readout, single lab\",\n      \"pmids\": [\"39819815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM8 promotes K48-linked ubiquitination of MYOF (myoferlin), facilitating its proteasomal degradation, thereby suppressing extracellular MMP secretion, cell migration, and lung cancer metastasis.\",\n      \"method\": \"Co-immunoprecipitation, K48-specific ubiquitination assay, gain-/loss-of-function experiments, xenograft model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus K48-specific ubiquitination assay, in vivo xenograft rescue, single lab\",\n      \"pmids\": [\"39934162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Endogenous TRIM8 localizes as a novel ciliary protein co-localizing with CEP170 at the centrosomal region throughout all mitotic phases. TRIM8 depletion results in reduced number of ciliated cells and shorter cilia in ARPE-19 cells, and perturbs the 'Cell Cycle Control of Chromosomal Replication' pathway. TRIM8 negatively regulates TOP2A expression.\",\n      \"method\": \"scRNA-seq, proteomics (LC-MS/MS), polysome profiling with RNA-seq, immunofluorescence microscopy, TRIM8 knockdown\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by immunofluorescence confirmed by multi-omics, functional KD with defined cilia phenotype, single lab\",\n      \"pmids\": [\"41057298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Disease-causing C-terminal truncations of TRIM8 disrupt its condensate formation, impair proteasomal regulation, and disrupt TAK1/NF-κB signaling; functional assays in cellular and animal models link these disruptions to podocyte dysfunction and impaired response to injury.\",\n      \"method\": \"Systematic mesoscale localization screen (72 TRIM proteins), condensate formation assays, proteasomal regulation assays, NF-κB signaling assays, podocyte functional models, animal models\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays in cellular and animal models; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM8 ubiquitinates and degrades SOCS1 in cervical cancer cells, promoting cancer cell proliferation, invasion, and migration; inhibition of SOCS1 partially reverses the effects of TRIM8 knockdown.\",\n      \"method\": \"Protein immunoprecipitation, ubiquitination assay (MG132 treatment), CCK-8/colony formation/Transwell assays, rescue experiments with si-SOCS1\",\n      \"journal\": \"Biochemical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay with proteasome inhibitor, functional rescue experiment, single lab\",\n      \"pmids\": [\"38918306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM8 interacts with GPX1 (glutathione peroxidase 1) and promotes GPX1 ubiquitination and degradation, negatively regulating antioxidant defense in cardiomyocytes during ischemia/reperfusion injury.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, TRIM8 overexpression/knockdown, in vitro I/R model and in vivo rat model\",\n      \"journal\": \"Pharmaceutical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay, in vivo rat validation, single lab\",\n      \"pmids\": [\"35968584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ITLN1 antagonizes TRIM8-mediated K48-linked ubiquitination and degradation of CAPN2 (calpain-2) by binding TRIM8, thereby stabilizing CAPN2 and promoting ZBP1-dependent PANoptosis in intestinal epithelial cells in Crohn's disease.\",\n      \"method\": \"Co-immunoprecipitation combined with mass spectrometry, RNA-seq, ubiquitination assays, rescue experiments, IL-10 KO colitis mouse model\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identification, ubiquitination assays, functional rescue, in vivo KO model, single study\",\n      \"pmids\": [\"40520022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM8 inhibits DUSP14, promoting MAPKs pathway activation, leading to adipocyte inflammation and insulin resistance; TRIM8 deficiency decreased inflammatory cytokines and improved insulin signaling, effects reversed by DUSP14 knockdown.\",\n      \"method\": \"TRIM8 knockdown/overexpression, DUSP14 knockdown/overexpression, cytokine measurements, glucose uptake assay, Western blot for insulin signaling\",\n      \"journal\": \"Adipocyte\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional rescue experiments placing TRIM8 upstream of DUSP14/MAPKs, but no direct binding or ubiquitination data shown, single lab\",\n      \"pmids\": [\"39039652\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIM8 is a RING finger-containing E3 ubiquitin ligase that operates at the intersection of NF-κB, p53, and JAK-STAT signaling: it promotes K63-linked polyubiquitination and activation of TAK1 to potentiate NF-κB responses, while also targeting TRIF for K6/K33-linked ubiquitination to terminate TLR3/4 signaling; it stabilizes p53 by physically interacting with it, degrading MDM2, and reducing ΔNp63α; it promotes STAT3 signaling by ubiquitinating and degrading the STAT3 inhibitor PIAS3 or by modulating STAT3 nuclear transport via Hsp90β; it protects phospho-IRF7 from Pin1-mediated proteasomal destruction in plasmacytoid dendritic cells in an E3-independent manner; it ubiquitinates and degrades SOCS-1, EWS/FLI, ERα, VDAC2, MYOF, YTHDF2, GPX1, and CAPN2 via K48-linked polyubiquitination; it promotes K63-linked ubiquitination of PGK1 to drive glycolysis-dependent angiogenesis; it localizes to nuclear bodies in a C-terminus-dependent manner, and to the mitotic spindle and centrosome/ciliary base, where it regulates bipolar spindle formation, chromosomal stability, and ciliogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRIM8 is a RING finger E3 ubiquitin ligase of the RBCC/TRIM family that governs protein stability across innate immune, transcriptional, and cell-cycle programs by directing substrate-selective polyubiquitination [#1, #14]. In innate immunity it acts bidirectionally: it potentiates NF-\\u03baB signaling by mediating K63-linked polyubiquitination of the kinase TAK1, with cytoplasmic translocation of TRIM8 required for this activation [#3, #6]; conversely it restrains TLR3/TLR4 responses by catalyzing K6/K33-linked ubiquitination of TRIF to disrupt the TRIF-TBK1 association, and Trim8-knockout mice show heightened susceptibility to endotoxin and Salmonella [#7]. TRIM8 also reinforces STAT3-dependent signaling by ubiquitinating and degrading the STAT3 inhibitor PIAS3, forming a positive feedback loop that sustains glioblastoma stem-cell self-renewal, and modulates phospho-STAT3 nuclear transport through Hsp90\\u03b2 [#2, #8, #4]. Through physical interaction with p53 it impairs the p53-MDM2 association, drives MDM2 degradation, and stabilizes p53 to enforce cell-cycle arrest, while itself being a p53-induced gene [#5]. The bulk of its characterized targets are degraded via K48-linked polyubiquitination\\u2014including the EWS/FLI fusion oncoprotein (making TRIM8 a selective dependency in Ewing sarcoma), HNF4\\u03b1 (recruited by TRIB3 during NAFLD), ER\\u03b1, VDAC2, MYOF, YTHDF2, GPX1, SOCS1, and CAPN2\\u2014linking TRIM8 to oncogenic protein turnover, ferroptosis, and antioxidant defense [#14, #18, #17, #20, #24, #22, #28, #27, #29]. A non-catalytic mode also exists: in plasmacytoid dendritic cells TRIM8 protects phospho-IRF7 from Pin1-mediated proteasomal destruction in an E3-independent manner to enable type I IFN production [#10]. TRIM8 localizes to nuclear bodies in a C-terminus-dependent manner and to the mitotic spindle and centrosome/ciliary base, where it interacts with KIF11/Eg5 and KIFC1 to control centrosome separation, spindle bipolarity, chromosomal stability, and ciliogenesis [#15, #12, #25]. De novo C-terminal truncating variants mislocalize TRIM8 from nuclear bodies to diffuse nucleoplasm, defining a human disease mechanism affecting podocyte and neuronal function [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established TRIM8 as a regulator of cytokine signaling by showing it destabilizes a key negative regulator, the first functional readout for the protein.\",\n      \"evidence\": \"Reciprocal Co-IP in vitro and in vivo plus co-expression functional assay showing TRIM8 decreases SOCS-1 stability and relieves IFN-\\u03b3 repression\",\n      \"pmids\": [\"12163497\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin-linkage type not defined\", \"RING-dependence of SOCS-1 turnover not established in this study\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined a STAT3-promoting mode by identifying PIAS3 as a TRIM8 target whose loss enhances STAT3 signaling and supports transformation.\",\n      \"evidence\": \"Co-IP, proteasome-pathway assays, nuclear/cytoplasmic fractionation, and focus-formation assay in NIH3T3 cells\",\n      \"pmids\": [\"20516148\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether regulation is degradation versus nuclear exclusion left ambiguous\", \"Ubiquitin-linkage specificity not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified the catalytic basis for TRIM8's NF-\\u03baB activation by showing K63-linked ubiquitination of the upstream kinase TAK1.\",\n      \"evidence\": \"Co-IP, K63-specific ubiquitination assay, and overexpression/knockdown with NF-\\u03baB reporters\",\n      \"pmids\": [\"22084099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin acceptor lysines on TAK1 not mapped\", \"Signal-dependent regulation of TRIM8 activity not defined here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected TRIM8 to the p53 tumor-suppressor axis, showing it stabilizes p53 by degrading MDM2 and is itself a p53 stress-response target.\",\n      \"evidence\": \"Co-IP, Western blot for MDM2 degradation, cell-cycle analysis, and qRT-PCR of p53 targets after UV stress\",\n      \"pmids\": [\"22262183\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct MDM2 ubiquitination by TRIM8 not demonstrated\", \"Linkage type on MDM2 unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed that subcellular relocation gates TRIM8 function, with TNF-induced nuclear-to-cytoplasmic translocation required for NF-\\u03baB activation.\",\n      \"evidence\": \"Live GFP-TRIM8 imaging, domain-mutant analysis, fractionation, and NF-\\u03baB reporters\",\n      \"pmids\": [\"23152791\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trigger and machinery for translocation unknown\", \"Relationship to TAK1 ubiquitination not integrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved a context-dependent immune role: TRIM8 negatively regulates TLR3/4 signaling by atypical K6/K33 ubiquitination of TRIF, validated by knockout-mouse phenotypes.\",\n      \"evidence\": \"Trim8-knockout mice, Co-IP, K6/K33-specific ubiquitination assays, and in vivo infection/inflammation models\",\n      \"pmids\": [\"28747347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TRIM8 switches between NF-\\u03baB activation and TLR restraint not defined\", \"TRIF acceptor lysines not mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed TRIM8 in cancer stemness through a STAT3-PIAS3 positive feedback loop sustaining glioblastoma stem-like cells.\",\n      \"evidence\": \"TRIM8 KD/OE, Western blots for p-STAT3/PIAS3/stemness markers, sphere-forming assays, and immunoprecipitation\",\n      \"pmids\": [\"28100038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PIAS3 ubiquitin-linkage type not specified\", \"Generality beyond GSCs untested in this study\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended the p53 network by showing TRIM8 lowers pro-proliferative \\u0394Np63\\u03b1 in a reciprocal negative feedback loop.\",\n      \"evidence\": \"Western blot of \\u0394Np63\\u03b1, proteasome and caspase-1 inhibitor assays, and TRIM8 promoter luciferase reporter\",\n      \"pmids\": [\"31781486\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ubiquitination of \\u0394Np63\\u03b1 not shown\", \"Role of caspase-1 versus proteasome not fully separated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed a cytoprotective role linking TRIM8 to autophagy and apoptosis control during genotoxic stress.\",\n      \"evidence\": \"LC3-turnover autophagy flux assays, Co-IP of a TRIM8-XIAP-caspase-3 complex, and etoposide treatment with KD/OE\",\n      \"pmids\": [\"29678622\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TRIM8 ubiquitinates XIAP or caspase-3 directly unclear\", \"Mechanism of lysosomal/autophagy regulation undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Uncovered an E3-independent function: TRIM8 shields phospho-IRF7 from Pin1-driven degradation to license type I IFN in pDCs.\",\n      \"evidence\": \"siRNA screen in primary human pDCs, Co-IP with Pin1, and proteasomal degradation assays\",\n      \"pmids\": [\"31799391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of pIRF7 protection not defined\", \"Whether the RING is dispensable in other contexts unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a mitotic structural role, placing TRIM8 at the spindle/centrosome through interactions with spindle motors and linking it to chromosomal stability.\",\n      \"evidence\": \"Interactome proteomics in neural stem cells, Co-IP with KIF11/KIFC1, mitotic immunofluorescence, and KD cell-cycle analysis\",\n      \"pmids\": [\"31904480\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether spindle regulation requires E3 activity unknown\", \"Motor substrates of TRIM8 ubiquitination not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked TRIM8 to neurodevelopment and schizophrenia risk via promoter regulation by POU3F2 and effects on neural progenitor differentiation.\",\n      \"evidence\": \"Luciferase reporter, EMSA at SNP rs5011218, TRIM8 KD in NPCs, and mEPSC electrophysiology\",\n      \"pmids\": [\"32929213\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream TRIM8 effectors in neurons not identified\", \"Single-lab functional readouts\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified TRIM8 as a selective Ewing sarcoma dependency by degrading the EWS/FLI fusion oncoprotein to prevent oncogene overdose.\",\n      \"evidence\": \"CRISPR-Cas9 screen, TRIM8 knockout, ubiquitination and protein-stability assays, and rescue experiments\",\n      \"pmids\": [\"34329586\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"EWS/FLI ubiquitin acceptor sites not mapped\", \"Generalizability to other fusion oncoproteins untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established the human disease mechanism by showing C-terminal truncating variants mislocalize TRIM8 from nuclear bodies to diffuse nucleoplasm.\",\n      \"evidence\": \"Overexpression of WT and patient-variant constructs in podocytes and neuronal cells with co-localization microscopy\",\n      \"pmids\": [\"33508234\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of mislocalization on substrate ubiquitination not measured\", \"Nuclear-body composition incompletely defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed TRIM8 participates in reciprocal E3-E3 cross-regulation, being degraded by and degrading TRIM21 in cancer cells.\",\n      \"evidence\": \"Reciprocal Co-IP and K48-specific ubiquitination assays with KD/OE in lung and renal cancer cells\",\n      \"pmids\": [\"37914816\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological trigger for the mutual degradation unknown\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated adaptor-directed substrate selection, with TRIB3 recruiting TRIM8 to degrade HNF4\\u03b1 via site-specific K48 ubiquitination during NAFLD.\",\n      \"evidence\": \"Co-IP/MS, in vitro and in vivo ubiquitination assays, and K470 site-specific mutagenesis\",\n      \"pmids\": [\"38237865\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other adaptors redirect TRIM8 substrate choice unknown\", \"Regulation of TRIB3-TRIM8 complex assembly undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Broadened the K48-degradation substrate set into cancer metabolism and ferroptosis (VDAC2, SOCS1) supporting tumor cell survival and proliferation.\",\n      \"evidence\": \"Co-IP/MS, ubiquitination assays, functional rescue, and xenograft models across ovarian and cervical cancer\",\n      \"pmids\": [\"38881325\", \"38918306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Acceptor lysines not mapped\", \"Context-specificity of substrate engagement unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Consolidated TRIM8 as a broad K48-ligase across antiviral defense and disease (PEDV N protein, MYOF, YTHDF2, GPX1, CAPN2) and as a K63-ligase promoting PGK1-driven glycolytic angiogenesis.\",\n      \"evidence\": \"Co-IP with domain mapping, linkage-specific ubiquitination assays, and in vivo/functional models across multiple tissues\",\n      \"pmids\": [\"39819815\", \"39934162\", \"40073810\", \"35968584\", \"40520022\", \"41184227\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants of K48-versus-K63 linkage choice across substrates undefined\", \"Most substrates established by single labs\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined the mitotic/ciliary localization by placing endogenous TRIM8 with CEP170 at the centrosome throughout mitosis and linking depletion to ciliogenesis defects and TOP2A regulation.\",\n      \"evidence\": \"scRNA-seq, LC-MS/MS proteomics, polysome profiling, immunofluorescence, and KD in ARPE-19 cells\",\n      \"pmids\": [\"41057298\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ciliary function requires ubiquitin ligase activity unknown\", \"Direct ciliary substrates not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TRIM8 selects among its many K48 versus K63 substrates and switches between catalytic and E3-independent (e.g. pIRF7-protective) modes, and how C-terminal condensate/nuclear-body integrity controls these activities, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model for linkage-type or substrate selection\", \"Structural basis of condensate formation and its functional output undefined\", \"In vivo hierarchy among competing substrate pathways unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [3, 7, 14, 17, 18, 20, 21, 22, 24]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 3, 7, 14, 17, 18, 20, 24, 27, 28]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [3, 14, 17, 18]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 15]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 17]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [12, 25]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 10, 16]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 6, 8]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [14, 18, 17, 24, 27]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [5, 12, 25]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [11, 20, 29]}\n    ],\n    \"complexes\": [\"TRIB3-TRIM8-HNF4\\u03b1 E3 ligase complex\", \"TRIM8-XIAP-caspase-3 complex\"],\n    \"partners\": [\"TAK1\", \"TRIF\", \"PIAS3\", \"p53\", \"Pin1\", \"KIF11\", \"EWS/FLI\", \"HNF4\\u03b1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}