{"gene":"TRIM32","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2002,"finding":"TRIM32 (D487N mutation) was identified as causative for limb-girdle muscular dystrophy type 2H (LGMD2H); the mutation occurs in the NHL domain at a position highly conserved and involved in protein-protein interactions, consistent with TRIM32 functioning as an E3 ubiquitin ligase based on its RING domain.","method":"Genetic mapping, sequencing of candidate genes, homozygosity testing in affected families and controls","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic disease linkage with sequencing and family analysis; E3 ligase activity inferred from domain structure, not directly demonstrated in this paper","pmids":["11822024"],"is_preprint":false},{"year":2003,"finding":"TRIM32 exhibits E3 ubiquitin ligase properties including auto-ubiquitylation and interaction with ubiquitylated proteins; it inhibits TNF-α/UVB-induced apoptosis in keratinocytes, suggesting its ligase activity promotes cell survival by blocking apoptotic signaling.","method":"Ubiquitylation assays, in vitro transformation assay, in vivo skin graft, apoptosis assays","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — E3 ligase activity demonstrated biochemically and functional anti-apoptotic role confirmed in vitro and in vivo, single lab","pmids":["14578165"],"is_preprint":false},{"year":2006,"finding":"A missense mutation in the B-box domain of TRIM32 (P130S) causes Bardet-Biedl syndrome type 11 (BBS11), identifying TRIM32 as a BBS gene and implicating the proteasome/ubiquitin degradation pathway in BBS pathogenesis.","method":"SNP microarray homozygosity mapping, mutation analysis, zebrafish functional analysis, expression quantitative trait loci analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — homozygosity mapping and mutation identification confirmed; zebrafish functional validation performed; single study","pmids":["16606853"],"is_preprint":false},{"year":2008,"finding":"LGMD2H-associated TRIM32 mutations (D487N, R394H) cluster in NHL domains, impair TRIM32 self-interaction and interaction with the E2 enzyme, and are mislocalized in cells; the BBS11 mutant (P130S) does not show these biochemical defects. This indicates NHL domain mutations cause disease through loss of protein-protein interaction capacity.","method":"Yeast two-hybrid interaction assay, co-immunoprecipitation, subcellular localization in transfected cells","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid and co-IP, single lab, multiple mutants tested","pmids":["17994549"],"is_preprint":false},{"year":2009,"finding":"TRIM32 ubiquitinates and degrades dysbindin (DTNBP1) via its E3 ligase activity; LGMD2H/STM mutations D487N and R394H impair ubiquitin ligase activity toward dysbindin. TRIM32 is localized to the Z-line in skeletal muscle. siRNA knockdown of TRIM32 in myoblasts elevates dysbindin levels.","method":"Yeast two-hybrid, in vitro ubiquitination assay, co-immunoprecipitation, siRNA knockdown, immunofluorescence localization","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination assay plus multiple orthogonal methods (Y2H, Co-IP, KD), single lab but rigorous","pmids":["19349376"],"is_preprint":false},{"year":2009,"finding":"TRIM32 is polarized during mitosis in mouse neural progenitors and becomes concentrated in one daughter cell. It ubiquitinates and degrades c-Myc and binds Argonaute-1 to increase activity of specific microRNAs (including Let-7), thereby promoting neuronal differentiation over progenitor self-renewal.","method":"Immunostaining and live imaging for polarization, ubiquitination assay for c-Myc, co-immunoprecipitation with Argonaute-1, microRNA activity assays, overexpression and inhibition experiments","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (ubiquitination assay, Co-IP, imaging, gain/loss of function), published in high-impact journal with extensive validation","pmids":["19269368"],"is_preprint":false},{"year":2009,"finding":"Trim32 knockout mice develop a myopathy with neurogenic features: histological myopathic changes, Z-line streaming, dilated sarcotubular system; additionally decreased neurofilament concentration and reduced myelinated motor axon diameters. TRIM32 is expressed at much higher levels in brain than skeletal muscle.","method":"Knockout mouse generation, histology, electron microscopy, real-time PCR, neurofilament analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with specific histological and neurological phenotypes, replicated across multiple analyses","pmids":["19155210"],"is_preprint":false},{"year":2011,"finding":"TRIM32 interacts with retinoic acid receptor α (RARα) and enhances its transcriptional activity in the presence of retinoic acid; TRIM32 overexpression promotes stability of RARα and enhances neural differentiation in neuroblastoma and embryonal carcinoma cells.","method":"Co-immunoprecipitation, transcriptional activity assays, overexpression in cell lines, differentiation assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional assays, single lab, multiple cell line models","pmids":["21984809"],"is_preprint":false},{"year":2011,"finding":"The common LGMD2H-associated D489N mutation in mouse Trim32 leads to loss of the mutant protein at the protein level (normal mRNA but severe reduction in protein), suggesting that the pathogenic mutation destabilizes TRIM32 and results in a null phenotype, explaining why knock-in mice phenocopy Trim32-null mice.","method":"Knock-in mouse generation, quantitative RT-PCR, Western blot","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knock-in mouse model with mRNA vs. protein comparison, single lab","pmids":["21775502"],"is_preprint":false},{"year":2012,"finding":"TRIM32 ubiquitinates MITA/STING at K20/150/224/236 with K63-linked chains through its E3 ubiquitin ligase activity, promoting MITA-TBK1 interaction and downstream IRF3 activation to enhance IFN-β induction and cellular antiviral response. TRIM32 localizes to mitochondria and endoplasmic reticulum.","method":"Co-immunoprecipitation, ubiquitination assay, mutagenesis of ubiquitination sites, overexpression/knockdown, subcellular fractionation/localization, antiviral response assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro/cell-based ubiquitination with site mutagenesis, multiple orthogonal methods, single lab","pmids":["22745133"],"is_preprint":false},{"year":2012,"finding":"TRIM32 regulates skeletal muscle satellite cell differentiation; loss of TRIM32 impairs myogenic differentiation via dysregulation of c-Myc, causing a LGMD2H-like phenotype and defective muscle regeneration in vivo.","method":"Knockout mouse analysis, myoblast differentiation assays, c-Myc protein level analysis, in vivo muscle regeneration after injury","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined cellular and in vivo phenotype, mechanism linked to c-Myc regulation (consistent with prior neural progenitor data), single lab","pmids":["22299041"],"is_preprint":false},{"year":2012,"finding":"Drosophila Thin (tn), the TRIM32 ortholog, is localized at the Z-disk in muscle and is required for costamere integrity; tn mutants show progressive disorganization of costameric proteins (β-integrin, Spectrin, Talin, Vinculin) and myofibril unbundling, demonstrating TRIM32's role in myofibril stability via costamere maintenance.","method":"Loss-of-function and rescue experiments in Drosophila, immunostaining for costameric proteins, electron microscopy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — Drosophila ortholog with loss-of-function, rescue, and detailed protein localization analysis; strongly informative for mammalian gene function","pmids":["23071324"],"is_preprint":false},{"year":2013,"finding":"TRIM32 is a direct transcriptional target of TAp73; TRIM32 physically interacts with TAp73 and promotes its ubiquitination and degradation, thereby impairing p73-dependent transcriptional activity. DNp73 represses TRIM32 expression, forming a negative feedback loop between p73 and TRIM32 in neural progenitor cells.","method":"Chromatin immunoprecipitation, reporter assays, co-immunoprecipitation, ubiquitination assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ubiquitination assay and Co-IP with transcriptional assays, single lab","pmids":["23828567"],"is_preprint":false},{"year":2013,"finding":"TRIM32 is upregulated during differentiation of adult neural stem cells; TRIM32 deficiency impairs neuronal differentiation, increases progenitor proliferation, reduces cell death, and results in overproduction of adult-generated olfactory bulb neurons in TRIM32 KO mice.","method":"KO mouse analysis, BrdU labeling, gene expression profiling, behavioral assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with well-defined cellular phenotypes in adult neurogenesis, single lab","pmids":["24357807"],"is_preprint":false},{"year":2014,"finding":"TRIM32 is a p53 target gene; p53 binds the TRIM32 promoter and induces TRIM32 expression in response to DNA damage stress; TRIM32 in turn interacts with p53 and promotes its ubiquitination and degradation, negatively regulating p53-mediated apoptosis, cell cycle arrest, and senescence.","method":"ChIP assay, reporter assay, co-immunoprecipitation, ubiquitination assay, apoptosis/senescence assays, mouse tumor models","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ubiquitination assay, ChIP, Co-IP, multiple functional assays, single lab with rigorous controls","pmids":["25146927"],"is_preprint":false},{"year":2014,"finding":"Trim32 ubiquitinates and degrades MYCN at spindle poles during mitosis. TRIM32 is recruited to spindle poles by CDK1/cyclin B-mediated phosphorylation and interacts with MYCN there, facilitating asymmetric cell division in human neuroblastoma cells.","method":"Co-immunoprecipitation, ubiquitination assay, immunofluorescence/localization, kinase assay (CDK1/cyclin B phosphorylation), sphere formation assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ubiquitination assay, co-IP, localization data, single lab","pmids":["25100564"],"is_preprint":false},{"year":2014,"finding":"Trim32 suppresses PI3K-Akt-FoxO signaling in muscle atrophy by promoting dissociation of plakoglobin from PI3K subunit p85; inhibition of Trim32 enhances plakoglobin-PI3K-p85 binding and activates PI3K-Akt-FoxO signaling, increasing glucose uptake and inducing fiber growth.","method":"Co-immunoprecipitation, knockdown/overexpression in muscle, glucose uptake assay, atrophy model","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, gain and loss of function with defined signaling and metabolic phenotype, single lab with multiple orthogonal approaches","pmids":["24567360"],"is_preprint":false},{"year":2015,"finding":"TRIM32 acts as an intrinsic restriction factor against influenza A virus by directly interacting with and ubiquitinating PB1 polymerase, leading to PB1 protein degradation and reduced polymerase activity. TRIM32 translocates with PB1 to the nucleus upon IAV infection. Catalytically inactive TRIM32 fails to restrict viral replication.","method":"Affinity purification/mass spectrometry, co-immunoprecipitation, ubiquitination assay, KO/reconstitution in MEFs, RNAi in epithelial cells, catalytic mutant analysis, viral replication assays","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination assay, KO/reconstitution, catalytic mutant, multiple cell types and orthogonal methods","pmids":["26057645"],"is_preprint":false},{"year":2015,"finding":"TRIM32 ubiquitinates NDRG2 in vitro and in skeletal muscle; NDRG2 accumulates in TRIM32-KO muscle and myoblasts; NDRG2 overexpression reduces myoblast proliferation. TRIM72 was also identified as a TRIM32 substrate in vitro but did not accumulate significantly in vivo.","method":"2D fluorescence difference gel electrophoresis (2D-DIGE), in vitro ubiquitination assay, Western blot in KO tissue, overexpression proliferation assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination plus KO tissue accumulation, single lab","pmids":["25701873"],"is_preprint":false},{"year":2017,"finding":"TRIM32 negatively regulates TLR3/4-mediated innate immune responses by targeting the adaptor protein TRIF for TAX1BP1-mediated selective autophagic degradation in an E3-ligase-activity-independent manner. TRIM32 links TRIF and TAX1BP1 through distinct domains. Trim32-/- mice are hypersensitive to Salmonella infection.","method":"Co-immunoprecipitation, selective autophagy inhibitor/TAX1BP1 KO studies, KO mice infection model, cytokine measurements","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, KO mouse phenotype, mechanistic dissection of autophagic pathway and domain requirements, single lab","pmids":["28898289"],"is_preprint":false},{"year":2017,"finding":"TRIM32 ubiquitinates and degrades dysbindin in neonatal rat ventricular cardiomyocytes, suppressing dysbindin-induced SRF signaling and hypertrophy. TRIM32 also activates p53 and caspase-3/-7 and inhibits XIAP in cardiomyocytes, regulating cardiomyocyte viability and apoptosis.","method":"Co-immunoprecipitation, Western blot for SRF pathway, hypertrophy assays, apoptosis assays (caspase activity), overexpression/knockdown","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional assays in cardiomyocytes; consistent with prior dysbindin-TRIM32 data, single lab","pmids":["28465353"],"is_preprint":false},{"year":2017,"finding":"TRIM32 (BBS11) K63-ubiquitinates NPHP5 at the centrosome during G2/M phase to trigger NPHP5 delocalization and cilia loss. USP9X deubiquitinates NPHP5 in G0/G1/S to protect cilia assembly. This dynamic ubiquitination/deubiquitination cycle coordinates ciliogenesis with the cell cycle.","method":"Co-immunoprecipitation, ubiquitination assays, centrosome localization studies, cell cycle synchronization, siRNA knockdown, ciliogenesis assays","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ubiquitination assay, co-IP, and localization with functional ciliogenesis readout, single lab","pmids":["28498859"],"is_preprint":false},{"year":2019,"finding":"TRIM32 mono-ubiquitylates p62/SQSTM1 on lysine residues to facilitate p62 sequestration and autophagic degradation. p62 reciprocally directs TRIM32 for lysosomal degradation by selective autophagy. The LGMD2H disease mutant of TRIM32 cannot undergo autophagic degradation and fails to mono-ubiquitylate p62.","method":"Knockout cell lines, co-immunoprecipitation, ubiquitination assays, autophagy flux assays, reintroduction of WT vs. mutant TRIM32","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ubiquitination assay with KO/reconstitution and disease mutant comparison, multiple orthogonal methods, single lab","pmids":["31685529"],"is_preprint":false},{"year":2019,"finding":"TRIM32 forms a complex with AMBRA1 and ULK1; TRIM32 activates ULK1 kinase activity through K63-linked unanchored polyubiquitin chains, thereby initiating autophagy in muscle cells upon atrophy induction. LGMD2H mutations in TRIM32 disrupt binding to ULK1 and fail to induce autophagy.","method":"Co-immunoprecipitation, ubiquitination assays, ULK1 kinase activity assay, autophagy flux assays, disease mutant analysis","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1 / Moderate — kinase activity reconstitution, ubiquitination assay, Co-IP, disease mutant analysis; multiple orthogonal methods in single lab","pmids":["31234693"],"is_preprint":false},{"year":2020,"finding":"TRIM32 maintains mTOR activity by promoting proteasomal degradation of RGS10, a GTPase-activating protein; TRIM32 deficiency reduces mTOR activity, impairs generation of GABAergic interneurons from medial/lateral ganglionic eminence progenitors, and leads to autism-like behaviors in mice. Treatment with mTOR activator 3BDO rescues these defects.","method":"KO mouse, co-immunoprecipitation/pulldown, proteasome inhibitor experiments, electrophysiology, behavioral assays, cell transplantation rescue","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined molecular mechanism (RGS10 degradation), pathway rescue, single lab","pmids":["31828304"],"is_preprint":false},{"year":2020,"finding":"TRIM32 ubiquitinates ARID1A to promote its proteasomal degradation in squamous cell carcinoma; USP11 deubiquitinase counteracts TRIM32 to stabilize ARID1A. TRIM32 depletion inhibits SCC proliferation, metastasis, and chemoresistance by stabilizing ARID1A, acting through the downstream target SDC2.","method":"Co-immunoprecipitation, ubiquitination assay, TRIM32 KD/OE, in vitro and in vivo tumor models, Western blot","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ubiquitination assay, KD/OE with functional readouts, single lab","pmids":["31914402"],"is_preprint":false},{"year":2020,"finding":"Drosophila TRIM32 (Thin) physically interacts with glycolytic enzymes Aldolase and Phosphoglycerate mutase; loss of TRIM32 reduces glycolytic intermediates and amino acids, resulting in reduced muscle and brain tissue size. TRIM32 is required for glycolytic flux and ectopic tumor growth.","method":"Biochemical interaction assays (co-IP/pulldown), metabolomics in tn mutants, tissue size measurements, dietary supplementation rescue, tumor model","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical interaction data plus metabolomic and genetic phenotyping in Drosophila model, single lab","pmids":["32223900"],"is_preprint":false},{"year":2020,"finding":"TRIM32 regulates mitochondrial ROS levels and sensitizes cells to oxidative stress-induced apoptosis; TRIM32 expression reduces XIAP levels and its E3 ligase activity is required for this pro-apoptotic effect. TRIM32 forms cytoplasmic speckles that transiently interact with mitochondria under oxidative stress.","method":"Overexpression/knockdown, ROS measurement, mitochondrial membrane potential assay, complex-I activity assay, co-localization imaging, XIAP overexpression rescue","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays with E3 ligase mutant and rescue experiment, single lab","pmids":["32918979"],"is_preprint":false},{"year":2023,"finding":"TRIM32 ubiquitinates STIM1 to promote its degradation; TSPAN18 competitively inhibits TRIM32-mediated STIM1 ubiquitination by binding STIM1, stabilizing STIM1 protein and enhancing store-operated calcium entry.","method":"Co-immunoprecipitation, ubiquitination assay, liquid chromatography-mass spectrometry, in vitro and in vivo cancer models","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ubiquitination assay, Co-IP, competitive interaction data, single lab","pmids":["37542345"],"is_preprint":false},{"year":2023,"finding":"CHK2 phosphorylates TRIM32 at S55 downstream of ATM (activated by ROS); phosphorylated TRIM32 then mediates K63-linked ubiquitination of ATG7 at K45 to initiate autophagy. Chk2-/- mice show reduced TRIM32 phosphorylation and reduced ATG7 ubiquitination in a stroke model.","method":"Co-immunoprecipitation, kinase assay, ubiquitination assay with site mutagenesis, KO mouse stroke model, phosphorylation site identification","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — kinase assay, ubiquitination with site mutagenesis, KO mouse validation, single lab with multiple orthogonal methods","pmids":["37943659"],"is_preprint":false},{"year":2023,"finding":"TRIM32 promotes autophagy-mediated (xenophagy) degradation of Mycobacterium tuberculosis in macrophages; TRIM32 knockdown impairs Mtb ubiquitination, reduces recruitment of autophagy receptors NDP52 and BECLIN1, and increases intracellular Mtb growth.","method":"TRIM32 ectopic expression/knockdown in THP1 macrophages, Mtb replication assay, immunofluorescence for autophagy receptors, ubiquitination assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and OE with defined mechanistic readouts (ubiquitination, receptor recruitment), single lab","pmids":["37543647"],"is_preprint":false}],"current_model":"TRIM32 is a RING-domain E3 ubiquitin ligase that targets a broad set of substrates (including MITA/STING, PB1, c-Myc, MYCN, dysbindin, p53, TAp73, NDRG2, TRIF, ARID1A, STIM1, NPHP5, RGS10, ATG7, and p62/SQSTM1) for K48- or K63-linked ubiquitination, thereby regulating innate antiviral/antibacterial immunity, neural progenitor differentiation and asymmetric cell division, skeletal muscle homeostasis and atrophy signaling (via PI3K-Akt-FoxO and ULK1-AMBRA1-dependent autophagy), and tumor suppression; disease-causing mutations in its NHL domains impair substrate ubiquitination and self-interaction, causing LGMD2H, while a B-box mutation causes Bardet-Biedl syndrome through a distinct mechanism."},"narrative":{"mechanistic_narrative":"TRIM32 is a RING-domain E3 ubiquitin ligase that couples substrate ubiquitination to control of cell fate, muscle and neural homeostasis, innate immunity, and tumor suppression [PMID:19349376, PMID:19269368, PMID:22745133]. Its catalytic activity drives K48-linked ubiquitination and proteasomal degradation of a broad substrate set — dysbindin at the muscle Z-line [PMID:19349376], c-Myc and MYCN to bias neural progenitors toward differentiation and asymmetric division [PMID:19269368, PMID:25100564], and the tumor-relevant substrates p53, TAp73, ARID1A, NDRG2, and STIM1 [PMID:25146927, PMID:23828567, PMID:31914402, PMID:25701873, PMID:37542345]; for several of these it sits in regulatory loops, being a transcriptional target of p53 and TAp73 while degrading them [PMID:25146927, PMID:23828567]. In innate immunity it functions both catalytically — K63-ubiquitinating STING/MITA to enhance IFN-β induction and ubiquitinating influenza PB1 polymerase to restrict viral replication [PMID:22745133, PMID:26057645] — and non-catalytically, bridging TRIF to TAX1BP1 for selective autophagic degradation to dampen TLR signaling [PMID:28898289]. TRIM32 is a central activator of autophagy: it generates K63-linked unanchored polyubiquitin chains that activate ULK1 within an AMBRA1–ULK1 complex, mono-ubiquitylates p62/SQSTM1, and ubiquitinates ATG7 downstream of ATM–CHK2 phosphorylation at Ser55 [PMID:31234693, PMID:31685529, PMID:37943659], and promotes xenophagic clearance of Mycobacterium tuberculosis [PMID:37543647]. In skeletal muscle it additionally suppresses PI3K-Akt-FoxO growth signaling by displacing plakoglobin from p85 [PMID:24567360]. Loss-of-function NHL-domain mutations (D487N, R394H) that impair self-interaction, E2 binding, and substrate ubiquitination cause limb-girdle muscular dystrophy type 2H, while a distinct B-box mutation (P130S) causes Bardet-Biedl syndrome type 11 [PMID:11822024, PMID:16606853, PMID:17994549, PMID:19349376].","teleology":[{"year":2002,"claim":"Established TRIM32 as a disease gene by linking an NHL-domain mutation to limb-girdle muscular dystrophy, raising the question of how a RING-containing protein causes myopathy.","evidence":"Genetic mapping and candidate-gene sequencing in affected families","pmids":["11822024"],"confidence":"Medium","gaps":["E3 ligase activity only inferred from RING domain, not demonstrated","No substrate identified","Muscle-specific mechanism unknown"]},{"year":2003,"claim":"Demonstrated TRIM32 is a bona fide E3 ligase capable of auto-ubiquitylation, moving the field from domain inference to biochemical activity and an anti-apoptotic cellular role.","evidence":"In vitro ubiquitylation assays and apoptosis assays in keratinocytes","pmids":["14578165"],"confidence":"Medium","gaps":["No physiological substrate defined","Anti-apoptotic mechanism not connected to specific targets"]},{"year":2006,"claim":"Showed a separate B-box mutation causes Bardet-Biedl syndrome, establishing that distinct TRIM32 domains drive mechanistically distinct diseases.","evidence":"Homozygosity mapping, mutation analysis, zebrafish validation","pmids":["16606853"],"confidence":"Medium","gaps":["Ciliary mechanism not defined at the time","Why B-box vs NHL mutations give different diseases unexplained"]},{"year":2008,"claim":"Resolved how NHL-domain LGMD2H mutations act, showing they impair self-interaction, E2 binding, and localization while the BBS B-box mutant does not, explaining domain-specific pathomechanisms.","evidence":"Yeast two-hybrid, co-IP, and localization of disease mutants","pmids":["17994549"],"confidence":"Medium","gaps":["Did not identify the muscle substrate whose loss causes disease","In vitro interaction data only"]},{"year":2009,"claim":"Identified the first physiological substrates and processes: dysbindin degradation at the muscle Z-line and c-Myc degradation during asymmetric neural progenitor division, linking TRIM32 to both muscle and neural fate control.","evidence":"In vitro ubiquitination, Y2H, Co-IP, siRNA, KO mouse, imaging (multiple studies)","pmids":["19349376","19269368","19155210"],"confidence":"High","gaps":["Direct K-linkage chains on dysbindin not fully defined","How polarization is achieved mechanistically unresolved","Relative contribution of neural vs muscle defects to disease unclear"]},{"year":2011,"claim":"Extended TRIM32 function to transcription-factor regulation and clarified that loss of protein stability underlies the LGMD2H knock-in phenotype.","evidence":"Co-IP and transcriptional assays for RARα; knock-in mouse mRNA/protein comparison","pmids":["21984809","21775502"],"confidence":"Medium","gaps":["RARα stabilization mechanism (catalytic vs non-catalytic) not resolved","Whether D489N is a true null in all tissues unconfirmed"]},{"year":2012,"claim":"Defined TRIM32 as an antiviral signaling amplifier (K63-ubiquitination of STING/MITA) and confirmed its c-Myc-dependent role in satellite-cell myogenesis, broadening it across immunity and muscle regeneration.","evidence":"Ubiquitination with site mutagenesis, fractionation, antiviral assays; KO mouse myogenesis assays","pmids":["22745133","22299041"],"confidence":"High","gaps":["How a Z-line/cytosolic ligase accesses mitochondrial/ER STING not fully explained","Direct vs indirect c-Myc regulation in muscle"]},{"year":2012,"claim":"Demonstrated through the Drosophila ortholog Thin that TRIM32 maintains myofibril integrity via costamere stability, providing a structural rationale for the dystrophic phenotype.","evidence":"Loss-of-function, rescue, and costameric protein staining in Drosophila","pmids":["23071324"],"confidence":"High","gaps":["Whether costamere maintenance is ubiquitination-dependent unknown","Direct substrate among costameric proteins not identified"]},{"year":2013,"claim":"Embedded TRIM32 in p73 and adult-neurogenesis circuits, showing it degrades TAp73 in a feedback loop and is required for proper neuronal differentiation versus progenitor expansion.","evidence":"ChIP, reporter, Co-IP, ubiquitination assays; KO mouse neurogenesis analysis","pmids":["23828567","24357807"],"confidence":"Medium","gaps":["Ubiquitin chain type on TAp73 not defined","Mechanism distinguishing self-renewal vs differentiation outputs incomplete"]},{"year":2014,"claim":"Established TRIM32 as a tumor-suppressor antagonist and asymmetric-division regulator: it degrades p53 (in a p53-induced feedback loop) and MYCN at spindle poles after CDK1/cyclin B recruitment, and suppresses muscle PI3K-Akt-FoxO signaling.","evidence":"ChIP, Co-IP, ubiquitination, kinase assay, atrophy/tumor models (multiple studies)","pmids":["25146927","25100564","24567360"],"confidence":"High","gaps":["How TRIM32 toggles between pro-survival (p53 degradation) and pro-apoptotic roles unresolved","Spindle-pole recruitment determinants beyond CDK1 phosphorylation incomplete"]},{"year":2015,"claim":"Identified additional muscle and antiviral substrates (NDRG2 in myoblast proliferation; influenza PB1 as a restriction target), confirming catalytic activity is required for viral restriction.","evidence":"2D-DIGE, in vitro ubiquitination, KO tissue Western; AP-MS, KO/reconstitution, catalytic mutant viral assays","pmids":["25701873","26057645"],"confidence":"High","gaps":["NDRG2 chain linkage not defined","How TRIM32 traffics to the nucleus with PB1 mechanistically unclear"]},{"year":2017,"claim":"Revealed TRIM32 acts non-catalytically as an adaptor bridging TRIF to TAX1BP1 for selective autophagy, and extended substrate degradation roles to cardiomyocytes and to cell-cycle-coupled ciliogenesis via NPHP5.","evidence":"Co-IP, autophagy/TAX1BP1 KO, KO mouse infection; cardiomyocyte assays; centrosome ubiquitination/ciliogenesis assays","pmids":["28898289","28465353","28498859"],"confidence":"High","gaps":["Switch between catalytic and adaptor modes not defined","Connection between NPHP5 ciliary mechanism and BBS B-box mutation unclear"]},{"year":2019,"claim":"Positioned TRIM32 as a direct autophagy initiator, generating unanchored K63 chains to activate ULK1 in the AMBRA1 complex and mono-ubiquitylating p62, with LGMD2H mutants failing both functions.","evidence":"ULK1 kinase activity reconstitution, ubiquitination, Co-IP, autophagy flux, disease-mutant analysis (two studies)","pmids":["31685529","31234693"],"confidence":"High","gaps":["How unanchored chains are assembled and delivered to ULK1 not detailed","Relative importance of autophagy vs proteasomal substrates to LGMD2H unresolved"]},{"year":2020,"claim":"Broadened TRIM32 substrate scope into mTOR signaling (RGS10 degradation, GABAergic neuron generation), SCC oncogenesis (ARID1A degradation), glycolysis, and oxidative-stress apoptosis.","evidence":"KO mouse with rescue, Co-IP/ubiquitination, tumor models, Drosophila metabolomics, ROS/XIAP assays (multiple studies)","pmids":["31828304","31914402","32223900","32918979"],"confidence":"Medium","gaps":["Whether glycolytic-enzyme interaction is ubiquitination-dependent unknown","Tissue-specific selection among the many substrates not explained"]},{"year":2023,"claim":"Defined upstream regulation of TRIM32 by ATM–CHK2 phosphorylation at Ser55 driving ATG7 K63-ubiquitination, added STIM1/calcium and tuberculosis xenophagy roles, integrating stress signaling with TRIM32-driven autophagy.","evidence":"Kinase and ubiquitination assays with site mutagenesis, KO mouse stroke model; Co-IP/competition assays; macrophage Mtb assays","pmids":["37943659","37542345","37543647"],"confidence":"High","gaps":["Whether Ser55 phosphorylation gates other substrates unknown","How TRIM32 selects targets across stress contexts unresolved"]},{"year":null,"claim":"How a single ligase selects among its many substrates and switches between K48/K63/mono-ubiquitination and catalytic versus adaptor modes in a tissue- and stress-specific manner remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of NHL substrate recognition across targets","Determinants of chain-linkage choice undefined","Mechanism connecting BBS B-box vs LGMD2H NHL mutations to distinct phenotypes incompletely understood"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[3,4,9,17,22,23]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,9,14,15,17,18,25,28]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[16,23,19]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[27]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[9,27]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[9]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[15,21]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4,11]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[19,22,23,29,30]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,17,19,30]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,14,18,25,28]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,13,15,24]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,14,27]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,2,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[16,24]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[6,10,11,16]}],"complexes":["AMBRA1-ULK1 autophagy initiation complex"],"partners":["DTNBP1","STING1","ULK1","AMBRA1","P53","TP73","SQSTM1","TRIF"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13049","full_name":"E3 ubiquitin-protein ligase TRIM32","aliases":["72 kDa Tat-interacting protein","RING-type E3 ubiquitin transferase TRIM32","Tripartite motif-containing protein 32","Zinc finger protein HT2A"],"length_aa":653,"mass_kda":72.0,"function":"E3 ubiquitin ligase that plays a role in various biological processes including neural stem cell differentiation, innate immunity, inflammatory resonse and autophagy (PubMed:19349376, PubMed:31123703). Plays a role in virus-triggered induction of IFN-beta and TNF by mediating the ubiquitination of STING1. Mechanistically, targets STING1 for 'Lys-63'-linked ubiquitination which promotes the interaction of STING1 with TBK1 (PubMed:22745133). Regulates bacterial clearance and promotes autophagy in Mycobacterium tuberculosis-infected macrophages (PubMed:37543647). Negatively regulates TLR3/4-mediated innate immune and inflammatory response by triggering the autophagic degradation of TICAM1 in an E3 activity-independent manner (PubMed:28898289). Plays an essential role in oxidative stress induced cell death by inducing loss of transmembrane potential and enhancing mitochondrial reactive oxygen species (ROS) production during oxidative stress conditions (PubMed:32918979). Ubiquitinates XIAP and targets it for proteasomal degradation (PubMed:21628460). Ubiquitinates DTNBP1 (dysbindin) and promotes its degradation (PubMed:19349376). May ubiquitinate BBS2 (PubMed:22500027). Ubiquitinates PIAS4/PIASY and promotes its degradation in keratinocytes treated with UVB and TNF (By similarity). Also acts as a regulator of autophagy by mediating formation of unanchored 'Lys-63'-linked polyubiquitin chains that activate ULK1: interaction with AMBRA1 is required for ULK1 activation (PubMed:31123703). Positively regulates dendritic branching by promoting ubiquitination and subsequent degradation of the epigenetic factor CDYL (PubMed:34888944). Under metabolic stress and phosphorylation by CHK2, mediates 'Lys-63'-linked ubiquitination of ATG7 at 'Lys-45' to initiate autophagy (PubMed:37943659) (Microbial infection) May play a significant role in mediating the biological activity of the HIV-1 Tat protein in vivo (PubMed:7778269). Binds specifically to the activation domain of HIV-1 Tat and can also interact with the HIV-2 and EIAV Tat proteins in vivo (PubMed:7778269)","subcellular_location":"Cytoplasm; Mitochondrion; Endoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/Q13049/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRIM32","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRIM32","total_profiled":1310},"omim":[{"mim_id":"616659","title":"TBC1 DOMAIN FAMILY, MEMBER 17; TBC1D17","url":"https://www.omim.org/entry/616659"},{"mim_id":"615988","title":"BARDET-BIEDL SYNDROME 11; BBS11","url":"https://www.omim.org/entry/615988"},{"mim_id":"607155","title":"MUSCULAR DYSTROPHY-DYSTROGLYCANOPATHY (LIMB-GIRDLE), TYPE C, 5; MDDGC5","url":"https://www.omim.org/entry/607155"},{"mim_id":"607145","title":"DYSTROBREVIN-BINDING PROTEIN 1; DTNBP1","url":"https://www.omim.org/entry/607145"},{"mim_id":"606596","title":"FUKUTIN-RELATED PROTEIN; FKRP","url":"https://www.omim.org/entry/606596"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Intermediate filaments","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRIM32"},"hgnc":{"alias_symbol":["HT2A","TATIP","BBS11"],"prev_symbol":["LGMD2H"]},"alphafold":{"accession":"Q13049","domains":[{"cath_id":"3.30.40.10","chopping":"14-98","consensus_level":"high","plddt":83.7308,"start":14,"end":98},{"cath_id":"2.120.10.30","chopping":"355-532_550-643","consensus_level":"medium","plddt":86.266,"start":355,"end":643},{"cath_id":"1.20.5","chopping":"134-242","consensus_level":"medium","plddt":89.971,"start":134,"end":242}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13049","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13049-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13049-F1-predicted_aligned_error_v6.png","plddt_mean":77.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRIM32","jax_strain_url":"https://www.jax.org/strain/search?query=TRIM32"},"sequence":{"accession":"Q13049","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13049.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13049/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13049"}},"corpus_meta":[{"pmid":"15309042","id":"PMC_15309042","title":"The 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TRIM32 mutation in limb-girdle muscular dystrophy type 2H.","date":"2009","source":"Neuromuscular disorders : NMD","url":"https://pubmed.ncbi.nlm.nih.gov/19303295","citation_count":30,"is_preprint":false},{"pmid":"12909198","id":"PMC_12909198","title":"Behavioral evidence for mu-opioid and 5-HT2A receptor interactions.","date":"2003","source":"European journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/12909198","citation_count":30,"is_preprint":false},{"pmid":"37542345","id":"PMC_37542345","title":"TSPAN18 facilitates bone metastasis of prostate cancer by protecting STIM1 from TRIM32-mediated ubiquitination.","date":"2023","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/37542345","citation_count":29,"is_preprint":false},{"pmid":"19492423","id":"PMC_19492423","title":"Intragenic deletion of TRIM32 in compound heterozygotes with sarcotubular myopathy/LGMD2H.","date":"2009","source":"Human 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genes, homozygosity testing in affected families and controls\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic disease linkage with sequencing and family analysis; E3 ligase activity inferred from domain structure, not directly demonstrated in this paper\",\n      \"pmids\": [\"11822024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TRIM32 exhibits E3 ubiquitin ligase properties including auto-ubiquitylation and interaction with ubiquitylated proteins; it inhibits TNF-α/UVB-induced apoptosis in keratinocytes, suggesting its ligase activity promotes cell survival by blocking apoptotic signaling.\",\n      \"method\": \"Ubiquitylation assays, in vitro transformation assay, in vivo skin graft, apoptosis assays\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — E3 ligase activity demonstrated biochemically and functional anti-apoptotic role confirmed in vitro and in vivo, single lab\",\n      \"pmids\": [\"14578165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A missense mutation in the B-box domain of TRIM32 (P130S) causes Bardet-Biedl syndrome type 11 (BBS11), identifying TRIM32 as a BBS gene and implicating the proteasome/ubiquitin degradation pathway in BBS pathogenesis.\",\n      \"method\": \"SNP microarray homozygosity mapping, mutation analysis, zebrafish functional analysis, expression quantitative trait loci analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — homozygosity mapping and mutation identification confirmed; zebrafish functional validation performed; single study\",\n      \"pmids\": [\"16606853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"LGMD2H-associated TRIM32 mutations (D487N, R394H) cluster in NHL domains, impair TRIM32 self-interaction and interaction with the E2 enzyme, and are mislocalized in cells; the BBS11 mutant (P130S) does not show these biochemical defects. This indicates NHL domain mutations cause disease through loss of protein-protein interaction capacity.\",\n      \"method\": \"Yeast two-hybrid interaction assay, co-immunoprecipitation, subcellular localization in transfected cells\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid and co-IP, single lab, multiple mutants tested\",\n      \"pmids\": [\"17994549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TRIM32 ubiquitinates and degrades dysbindin (DTNBP1) via its E3 ligase activity; LGMD2H/STM mutations D487N and R394H impair ubiquitin ligase activity toward dysbindin. TRIM32 is localized to the Z-line in skeletal muscle. siRNA knockdown of TRIM32 in myoblasts elevates dysbindin levels.\",\n      \"method\": \"Yeast two-hybrid, in vitro ubiquitination assay, co-immunoprecipitation, siRNA knockdown, immunofluorescence localization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination assay plus multiple orthogonal methods (Y2H, Co-IP, KD), single lab but rigorous\",\n      \"pmids\": [\"19349376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TRIM32 is polarized during mitosis in mouse neural progenitors and becomes concentrated in one daughter cell. It ubiquitinates and degrades c-Myc and binds Argonaute-1 to increase activity of specific microRNAs (including Let-7), thereby promoting neuronal differentiation over progenitor self-renewal.\",\n      \"method\": \"Immunostaining and live imaging for polarization, ubiquitination assay for c-Myc, co-immunoprecipitation with Argonaute-1, microRNA activity assays, overexpression and inhibition experiments\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (ubiquitination assay, Co-IP, imaging, gain/loss of function), published in high-impact journal with extensive validation\",\n      \"pmids\": [\"19269368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Trim32 knockout mice develop a myopathy with neurogenic features: histological myopathic changes, Z-line streaming, dilated sarcotubular system; additionally decreased neurofilament concentration and reduced myelinated motor axon diameters. TRIM32 is expressed at much higher levels in brain than skeletal muscle.\",\n      \"method\": \"Knockout mouse generation, histology, electron microscopy, real-time PCR, neurofilament analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with specific histological and neurological phenotypes, replicated across multiple analyses\",\n      \"pmids\": [\"19155210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRIM32 interacts with retinoic acid receptor α (RARα) and enhances its transcriptional activity in the presence of retinoic acid; TRIM32 overexpression promotes stability of RARα and enhances neural differentiation in neuroblastoma and embryonal carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, transcriptional activity assays, overexpression in cell lines, differentiation assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional assays, single lab, multiple cell line models\",\n      \"pmids\": [\"21984809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The common LGMD2H-associated D489N mutation in mouse Trim32 leads to loss of the mutant protein at the protein level (normal mRNA but severe reduction in protein), suggesting that the pathogenic mutation destabilizes TRIM32 and results in a null phenotype, explaining why knock-in mice phenocopy Trim32-null mice.\",\n      \"method\": \"Knock-in mouse generation, quantitative RT-PCR, Western blot\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knock-in mouse model with mRNA vs. protein comparison, single lab\",\n      \"pmids\": [\"21775502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRIM32 ubiquitinates MITA/STING at K20/150/224/236 with K63-linked chains through its E3 ubiquitin ligase activity, promoting MITA-TBK1 interaction and downstream IRF3 activation to enhance IFN-β induction and cellular antiviral response. TRIM32 localizes to mitochondria and endoplasmic reticulum.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, mutagenesis of ubiquitination sites, overexpression/knockdown, subcellular fractionation/localization, antiviral response assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro/cell-based ubiquitination with site mutagenesis, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"22745133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRIM32 regulates skeletal muscle satellite cell differentiation; loss of TRIM32 impairs myogenic differentiation via dysregulation of c-Myc, causing a LGMD2H-like phenotype and defective muscle regeneration in vivo.\",\n      \"method\": \"Knockout mouse analysis, myoblast differentiation assays, c-Myc protein level analysis, in vivo muscle regeneration after injury\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined cellular and in vivo phenotype, mechanism linked to c-Myc regulation (consistent with prior neural progenitor data), single lab\",\n      \"pmids\": [\"22299041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Drosophila Thin (tn), the TRIM32 ortholog, is localized at the Z-disk in muscle and is required for costamere integrity; tn mutants show progressive disorganization of costameric proteins (β-integrin, Spectrin, Talin, Vinculin) and myofibril unbundling, demonstrating TRIM32's role in myofibril stability via costamere maintenance.\",\n      \"method\": \"Loss-of-function and rescue experiments in Drosophila, immunostaining for costameric proteins, electron microscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Drosophila ortholog with loss-of-function, rescue, and detailed protein localization analysis; strongly informative for mammalian gene function\",\n      \"pmids\": [\"23071324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRIM32 is a direct transcriptional target of TAp73; TRIM32 physically interacts with TAp73 and promotes its ubiquitination and degradation, thereby impairing p73-dependent transcriptional activity. DNp73 represses TRIM32 expression, forming a negative feedback loop between p73 and TRIM32 in neural progenitor cells.\",\n      \"method\": \"Chromatin immunoprecipitation, reporter assays, co-immunoprecipitation, ubiquitination assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ubiquitination assay and Co-IP with transcriptional assays, single lab\",\n      \"pmids\": [\"23828567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRIM32 is upregulated during differentiation of adult neural stem cells; TRIM32 deficiency impairs neuronal differentiation, increases progenitor proliferation, reduces cell death, and results in overproduction of adult-generated olfactory bulb neurons in TRIM32 KO mice.\",\n      \"method\": \"KO mouse analysis, BrdU labeling, gene expression profiling, behavioral assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with well-defined cellular phenotypes in adult neurogenesis, single lab\",\n      \"pmids\": [\"24357807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRIM32 is a p53 target gene; p53 binds the TRIM32 promoter and induces TRIM32 expression in response to DNA damage stress; TRIM32 in turn interacts with p53 and promotes its ubiquitination and degradation, negatively regulating p53-mediated apoptosis, cell cycle arrest, and senescence.\",\n      \"method\": \"ChIP assay, reporter assay, co-immunoprecipitation, ubiquitination assay, apoptosis/senescence assays, mouse tumor models\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ubiquitination assay, ChIP, Co-IP, multiple functional assays, single lab with rigorous controls\",\n      \"pmids\": [\"25146927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Trim32 ubiquitinates and degrades MYCN at spindle poles during mitosis. TRIM32 is recruited to spindle poles by CDK1/cyclin B-mediated phosphorylation and interacts with MYCN there, facilitating asymmetric cell division in human neuroblastoma cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, immunofluorescence/localization, kinase assay (CDK1/cyclin B phosphorylation), sphere formation assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ubiquitination assay, co-IP, localization data, single lab\",\n      \"pmids\": [\"25100564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Trim32 suppresses PI3K-Akt-FoxO signaling in muscle atrophy by promoting dissociation of plakoglobin from PI3K subunit p85; inhibition of Trim32 enhances plakoglobin-PI3K-p85 binding and activates PI3K-Akt-FoxO signaling, increasing glucose uptake and inducing fiber growth.\",\n      \"method\": \"Co-immunoprecipitation, knockdown/overexpression in muscle, glucose uptake assay, atrophy model\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, gain and loss of function with defined signaling and metabolic phenotype, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"24567360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRIM32 acts as an intrinsic restriction factor against influenza A virus by directly interacting with and ubiquitinating PB1 polymerase, leading to PB1 protein degradation and reduced polymerase activity. TRIM32 translocates with PB1 to the nucleus upon IAV infection. Catalytically inactive TRIM32 fails to restrict viral replication.\",\n      \"method\": \"Affinity purification/mass spectrometry, co-immunoprecipitation, ubiquitination assay, KO/reconstitution in MEFs, RNAi in epithelial cells, catalytic mutant analysis, viral replication assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination assay, KO/reconstitution, catalytic mutant, multiple cell types and orthogonal methods\",\n      \"pmids\": [\"26057645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRIM32 ubiquitinates NDRG2 in vitro and in skeletal muscle; NDRG2 accumulates in TRIM32-KO muscle and myoblasts; NDRG2 overexpression reduces myoblast proliferation. TRIM72 was also identified as a TRIM32 substrate in vitro but did not accumulate significantly in vivo.\",\n      \"method\": \"2D fluorescence difference gel electrophoresis (2D-DIGE), in vitro ubiquitination assay, Western blot in KO tissue, overexpression proliferation assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination plus KO tissue accumulation, single lab\",\n      \"pmids\": [\"25701873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRIM32 negatively regulates TLR3/4-mediated innate immune responses by targeting the adaptor protein TRIF for TAX1BP1-mediated selective autophagic degradation in an E3-ligase-activity-independent manner. TRIM32 links TRIF and TAX1BP1 through distinct domains. Trim32-/- mice are hypersensitive to Salmonella infection.\",\n      \"method\": \"Co-immunoprecipitation, selective autophagy inhibitor/TAX1BP1 KO studies, KO mice infection model, cytokine measurements\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, KO mouse phenotype, mechanistic dissection of autophagic pathway and domain requirements, single lab\",\n      \"pmids\": [\"28898289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRIM32 ubiquitinates and degrades dysbindin in neonatal rat ventricular cardiomyocytes, suppressing dysbindin-induced SRF signaling and hypertrophy. TRIM32 also activates p53 and caspase-3/-7 and inhibits XIAP in cardiomyocytes, regulating cardiomyocyte viability and apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, Western blot for SRF pathway, hypertrophy assays, apoptosis assays (caspase activity), overexpression/knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional assays in cardiomyocytes; consistent with prior dysbindin-TRIM32 data, single lab\",\n      \"pmids\": [\"28465353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRIM32 (BBS11) K63-ubiquitinates NPHP5 at the centrosome during G2/M phase to trigger NPHP5 delocalization and cilia loss. USP9X deubiquitinates NPHP5 in G0/G1/S to protect cilia assembly. This dynamic ubiquitination/deubiquitination cycle coordinates ciliogenesis with the cell cycle.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, centrosome localization studies, cell cycle synchronization, siRNA knockdown, ciliogenesis assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ubiquitination assay, co-IP, and localization with functional ciliogenesis readout, single lab\",\n      \"pmids\": [\"28498859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM32 mono-ubiquitylates p62/SQSTM1 on lysine residues to facilitate p62 sequestration and autophagic degradation. p62 reciprocally directs TRIM32 for lysosomal degradation by selective autophagy. The LGMD2H disease mutant of TRIM32 cannot undergo autophagic degradation and fails to mono-ubiquitylate p62.\",\n      \"method\": \"Knockout cell lines, co-immunoprecipitation, ubiquitination assays, autophagy flux assays, reintroduction of WT vs. mutant TRIM32\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ubiquitination assay with KO/reconstitution and disease mutant comparison, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"31685529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM32 forms a complex with AMBRA1 and ULK1; TRIM32 activates ULK1 kinase activity through K63-linked unanchored polyubiquitin chains, thereby initiating autophagy in muscle cells upon atrophy induction. LGMD2H mutations in TRIM32 disrupt binding to ULK1 and fail to induce autophagy.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, ULK1 kinase activity assay, autophagy flux assays, disease mutant analysis\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — kinase activity reconstitution, ubiquitination assay, Co-IP, disease mutant analysis; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"31234693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM32 maintains mTOR activity by promoting proteasomal degradation of RGS10, a GTPase-activating protein; TRIM32 deficiency reduces mTOR activity, impairs generation of GABAergic interneurons from medial/lateral ganglionic eminence progenitors, and leads to autism-like behaviors in mice. Treatment with mTOR activator 3BDO rescues these defects.\",\n      \"method\": \"KO mouse, co-immunoprecipitation/pulldown, proteasome inhibitor experiments, electrophysiology, behavioral assays, cell transplantation rescue\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined molecular mechanism (RGS10 degradation), pathway rescue, single lab\",\n      \"pmids\": [\"31828304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM32 ubiquitinates ARID1A to promote its proteasomal degradation in squamous cell carcinoma; USP11 deubiquitinase counteracts TRIM32 to stabilize ARID1A. TRIM32 depletion inhibits SCC proliferation, metastasis, and chemoresistance by stabilizing ARID1A, acting through the downstream target SDC2.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, TRIM32 KD/OE, in vitro and in vivo tumor models, Western blot\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ubiquitination assay, KD/OE with functional readouts, single lab\",\n      \"pmids\": [\"31914402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Drosophila TRIM32 (Thin) physically interacts with glycolytic enzymes Aldolase and Phosphoglycerate mutase; loss of TRIM32 reduces glycolytic intermediates and amino acids, resulting in reduced muscle and brain tissue size. TRIM32 is required for glycolytic flux and ectopic tumor growth.\",\n      \"method\": \"Biochemical interaction assays (co-IP/pulldown), metabolomics in tn mutants, tissue size measurements, dietary supplementation rescue, tumor model\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical interaction data plus metabolomic and genetic phenotyping in Drosophila model, single lab\",\n      \"pmids\": [\"32223900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM32 regulates mitochondrial ROS levels and sensitizes cells to oxidative stress-induced apoptosis; TRIM32 expression reduces XIAP levels and its E3 ligase activity is required for this pro-apoptotic effect. TRIM32 forms cytoplasmic speckles that transiently interact with mitochondria under oxidative stress.\",\n      \"method\": \"Overexpression/knockdown, ROS measurement, mitochondrial membrane potential assay, complex-I activity assay, co-localization imaging, XIAP overexpression rescue\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays with E3 ligase mutant and rescue experiment, single lab\",\n      \"pmids\": [\"32918979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM32 ubiquitinates STIM1 to promote its degradation; TSPAN18 competitively inhibits TRIM32-mediated STIM1 ubiquitination by binding STIM1, stabilizing STIM1 protein and enhancing store-operated calcium entry.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, liquid chromatography-mass spectrometry, in vitro and in vivo cancer models\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ubiquitination assay, Co-IP, competitive interaction data, single lab\",\n      \"pmids\": [\"37542345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CHK2 phosphorylates TRIM32 at S55 downstream of ATM (activated by ROS); phosphorylated TRIM32 then mediates K63-linked ubiquitination of ATG7 at K45 to initiate autophagy. Chk2-/- mice show reduced TRIM32 phosphorylation and reduced ATG7 ubiquitination in a stroke model.\",\n      \"method\": \"Co-immunoprecipitation, kinase assay, ubiquitination assay with site mutagenesis, KO mouse stroke model, phosphorylation site identification\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — kinase assay, ubiquitination with site mutagenesis, KO mouse validation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37943659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM32 promotes autophagy-mediated (xenophagy) degradation of Mycobacterium tuberculosis in macrophages; TRIM32 knockdown impairs Mtb ubiquitination, reduces recruitment of autophagy receptors NDP52 and BECLIN1, and increases intracellular Mtb growth.\",\n      \"method\": \"TRIM32 ectopic expression/knockdown in THP1 macrophages, Mtb replication assay, immunofluorescence for autophagy receptors, ubiquitination assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and OE with defined mechanistic readouts (ubiquitination, receptor recruitment), single lab\",\n      \"pmids\": [\"37543647\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIM32 is a RING-domain E3 ubiquitin ligase that targets a broad set of substrates (including MITA/STING, PB1, c-Myc, MYCN, dysbindin, p53, TAp73, NDRG2, TRIF, ARID1A, STIM1, NPHP5, RGS10, ATG7, and p62/SQSTM1) for K48- or K63-linked ubiquitination, thereby regulating innate antiviral/antibacterial immunity, neural progenitor differentiation and asymmetric cell division, skeletal muscle homeostasis and atrophy signaling (via PI3K-Akt-FoxO and ULK1-AMBRA1-dependent autophagy), and tumor suppression; disease-causing mutations in its NHL domains impair substrate ubiquitination and self-interaction, causing LGMD2H, while a B-box mutation causes Bardet-Biedl syndrome through a distinct mechanism.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRIM32 is a RING-domain E3 ubiquitin ligase that couples substrate ubiquitination to control of cell fate, muscle and neural homeostasis, innate immunity, and tumor suppression [#4, #5, #9]. Its catalytic activity drives K48-linked ubiquitination and proteasomal degradation of a broad substrate set — dysbindin at the muscle Z-line [#4], c-Myc and MYCN to bias neural progenitors toward differentiation and asymmetric division [#5, #15], and the tumor-relevant substrates p53, TAp73, ARID1A, NDRG2, and STIM1 [#14, #12, #25, #18, #28]; for several of these it sits in regulatory loops, being a transcriptional target of p53 and TAp73 while degrading them [#14, #12]. In innate immunity it functions both catalytically — K63-ubiquitinating STING/MITA to enhance IFN-β induction and ubiquitinating influenza PB1 polymerase to restrict viral replication [#9, #17] — and non-catalytically, bridging TRIF to TAX1BP1 for selective autophagic degradation to dampen TLR signaling [#19]. TRIM32 is a central activator of autophagy: it generates K63-linked unanchored polyubiquitin chains that activate ULK1 within an AMBRA1–ULK1 complex, mono-ubiquitylates p62/SQSTM1, and ubiquitinates ATG7 downstream of ATM–CHK2 phosphorylation at Ser55 [#23, #22, #29], and promotes xenophagic clearance of Mycobacterium tuberculosis [#30]. In skeletal muscle it additionally suppresses PI3K-Akt-FoxO growth signaling by displacing plakoglobin from p85 [#16]. Loss-of-function NHL-domain mutations (D487N, R394H) that impair self-interaction, E2 binding, and substrate ubiquitination cause limb-girdle muscular dystrophy type 2H, while a distinct B-box mutation (P130S) causes Bardet-Biedl syndrome type 11 [#0, #2, #3, #4].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established TRIM32 as a disease gene by linking an NHL-domain mutation to limb-girdle muscular dystrophy, raising the question of how a RING-containing protein causes myopathy.\",\n      \"evidence\": \"Genetic mapping and candidate-gene sequencing in affected families\",\n      \"pmids\": [\"11822024\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase activity only inferred from RING domain, not demonstrated\", \"No substrate identified\", \"Muscle-specific mechanism unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated TRIM32 is a bona fide E3 ligase capable of auto-ubiquitylation, moving the field from domain inference to biochemical activity and an anti-apoptotic cellular role.\",\n      \"evidence\": \"In vitro ubiquitylation assays and apoptosis assays in keratinocytes\",\n      \"pmids\": [\"14578165\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No physiological substrate defined\", \"Anti-apoptotic mechanism not connected to specific targets\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed a separate B-box mutation causes Bardet-Biedl syndrome, establishing that distinct TRIM32 domains drive mechanistically distinct diseases.\",\n      \"evidence\": \"Homozygosity mapping, mutation analysis, zebrafish validation\",\n      \"pmids\": [\"16606853\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ciliary mechanism not defined at the time\", \"Why B-box vs NHL mutations give different diseases unexplained\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved how NHL-domain LGMD2H mutations act, showing they impair self-interaction, E2 binding, and localization while the BBS B-box mutant does not, explaining domain-specific pathomechanisms.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, and localization of disease mutants\",\n      \"pmids\": [\"17994549\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the muscle substrate whose loss causes disease\", \"In vitro interaction data only\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified the first physiological substrates and processes: dysbindin degradation at the muscle Z-line and c-Myc degradation during asymmetric neural progenitor division, linking TRIM32 to both muscle and neural fate control.\",\n      \"evidence\": \"In vitro ubiquitination, Y2H, Co-IP, siRNA, KO mouse, imaging (multiple studies)\",\n      \"pmids\": [\"19349376\", \"19269368\", \"19155210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct K-linkage chains on dysbindin not fully defined\", \"How polarization is achieved mechanistically unresolved\", \"Relative contribution of neural vs muscle defects to disease unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended TRIM32 function to transcription-factor regulation and clarified that loss of protein stability underlies the LGMD2H knock-in phenotype.\",\n      \"evidence\": \"Co-IP and transcriptional assays for RARα; knock-in mouse mRNA/protein comparison\",\n      \"pmids\": [\"21984809\", \"21775502\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RARα stabilization mechanism (catalytic vs non-catalytic) not resolved\", \"Whether D489N is a true null in all tissues unconfirmed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined TRIM32 as an antiviral signaling amplifier (K63-ubiquitination of STING/MITA) and confirmed its c-Myc-dependent role in satellite-cell myogenesis, broadening it across immunity and muscle regeneration.\",\n      \"evidence\": \"Ubiquitination with site mutagenesis, fractionation, antiviral assays; KO mouse myogenesis assays\",\n      \"pmids\": [\"22745133\", \"22299041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a Z-line/cytosolic ligase accesses mitochondrial/ER STING not fully explained\", \"Direct vs indirect c-Myc regulation in muscle\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated through the Drosophila ortholog Thin that TRIM32 maintains myofibril integrity via costamere stability, providing a structural rationale for the dystrophic phenotype.\",\n      \"evidence\": \"Loss-of-function, rescue, and costameric protein staining in Drosophila\",\n      \"pmids\": [\"23071324\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether costamere maintenance is ubiquitination-dependent unknown\", \"Direct substrate among costameric proteins not identified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Embedded TRIM32 in p73 and adult-neurogenesis circuits, showing it degrades TAp73 in a feedback loop and is required for proper neuronal differentiation versus progenitor expansion.\",\n      \"evidence\": \"ChIP, reporter, Co-IP, ubiquitination assays; KO mouse neurogenesis analysis\",\n      \"pmids\": [\"23828567\", \"24357807\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin chain type on TAp73 not defined\", \"Mechanism distinguishing self-renewal vs differentiation outputs incomplete\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established TRIM32 as a tumor-suppressor antagonist and asymmetric-division regulator: it degrades p53 (in a p53-induced feedback loop) and MYCN at spindle poles after CDK1/cyclin B recruitment, and suppresses muscle PI3K-Akt-FoxO signaling.\",\n      \"evidence\": \"ChIP, Co-IP, ubiquitination, kinase assay, atrophy/tumor models (multiple studies)\",\n      \"pmids\": [\"25146927\", \"25100564\", \"24567360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TRIM32 toggles between pro-survival (p53 degradation) and pro-apoptotic roles unresolved\", \"Spindle-pole recruitment determinants beyond CDK1 phosphorylation incomplete\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified additional muscle and antiviral substrates (NDRG2 in myoblast proliferation; influenza PB1 as a restriction target), confirming catalytic activity is required for viral restriction.\",\n      \"evidence\": \"2D-DIGE, in vitro ubiquitination, KO tissue Western; AP-MS, KO/reconstitution, catalytic mutant viral assays\",\n      \"pmids\": [\"25701873\", \"26057645\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"NDRG2 chain linkage not defined\", \"How TRIM32 traffics to the nucleus with PB1 mechanistically unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed TRIM32 acts non-catalytically as an adaptor bridging TRIF to TAX1BP1 for selective autophagy, and extended substrate degradation roles to cardiomyocytes and to cell-cycle-coupled ciliogenesis via NPHP5.\",\n      \"evidence\": \"Co-IP, autophagy/TAX1BP1 KO, KO mouse infection; cardiomyocyte assays; centrosome ubiquitination/ciliogenesis assays\",\n      \"pmids\": [\"28898289\", \"28465353\", \"28498859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch between catalytic and adaptor modes not defined\", \"Connection between NPHP5 ciliary mechanism and BBS B-box mutation unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Positioned TRIM32 as a direct autophagy initiator, generating unanchored K63 chains to activate ULK1 in the AMBRA1 complex and mono-ubiquitylating p62, with LGMD2H mutants failing both functions.\",\n      \"evidence\": \"ULK1 kinase activity reconstitution, ubiquitination, Co-IP, autophagy flux, disease-mutant analysis (two studies)\",\n      \"pmids\": [\"31685529\", \"31234693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How unanchored chains are assembled and delivered to ULK1 not detailed\", \"Relative importance of autophagy vs proteasomal substrates to LGMD2H unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Broadened TRIM32 substrate scope into mTOR signaling (RGS10 degradation, GABAergic neuron generation), SCC oncogenesis (ARID1A degradation), glycolysis, and oxidative-stress apoptosis.\",\n      \"evidence\": \"KO mouse with rescue, Co-IP/ubiquitination, tumor models, Drosophila metabolomics, ROS/XIAP assays (multiple studies)\",\n      \"pmids\": [\"31828304\", \"31914402\", \"32223900\", \"32918979\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether glycolytic-enzyme interaction is ubiquitination-dependent unknown\", \"Tissue-specific selection among the many substrates not explained\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined upstream regulation of TRIM32 by ATM–CHK2 phosphorylation at Ser55 driving ATG7 K63-ubiquitination, added STIM1/calcium and tuberculosis xenophagy roles, integrating stress signaling with TRIM32-driven autophagy.\",\n      \"evidence\": \"Kinase and ubiquitination assays with site mutagenesis, KO mouse stroke model; Co-IP/competition assays; macrophage Mtb assays\",\n      \"pmids\": [\"37943659\", \"37542345\", \"37543647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Ser55 phosphorylation gates other substrates unknown\", \"How TRIM32 selects targets across stress contexts unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single ligase selects among its many substrates and switches between K48/K63/mono-ubiquitination and catalytic versus adaptor modes in a tissue- and stress-specific manner remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of NHL substrate recognition across targets\", \"Determinants of chain-linkage choice undefined\", \"Mechanism connecting BBS B-box vs LGMD2H NHL mutations to distinct phenotypes incompletely understood\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [3, 4, 9, 17, 22, 23]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 9, 14, 15, 17, 18, 25, 28]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [16, 23, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [27]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [9, 27]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [15, 21]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4, 11]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [19, 22, 23, 29, 30]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 17, 19, 30]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 14, 18, 25, 28]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 13, 15, 24]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 14, 27]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 2, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [16, 24]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [6, 10, 11, 16]}\n    ],\n    \"complexes\": [\n      \"AMBRA1-ULK1 autophagy initiation complex\"\n    ],\n    \"partners\": [\n      \"DTNBP1\",\n      \"STING1\",\n      \"ULK1\",\n      \"AMBRA1\",\n      \"p53\",\n      \"TP73\",\n      \"SQSTM1\",\n      \"TRIF\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}