{"gene":"TRIM44","run_date":"2026-04-28T21:43:00","timeline":{"discoveries":[{"year":2009,"finding":"TRIM44 interacts with and stabilizes Terf/TRIM17, a TRIM ubiquitin E3 ligase. TRIM44 inhibits ubiquitination of terf, preventing its proteasomal degradation. The N-terminal zinc-finger domain found in ubiquitin hydrolases (ZF UBP) of TRIM44 was proposed to mediate this deubiquitinase-like activity, classifying TRIM44 as a 'USP-like-TRIM' that regulates associated TRIM proteins.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, proteasome inhibitor treatment in mammalian cells","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — in vitro ubiquitination assay plus pulldown and functional cell-based validation in a single study","pmids":["19358823"],"is_preprint":false},{"year":2018,"finding":"TRIM44 functions as a deubiquitinase for HIF-1α, stabilizing HIF-1α expression during both hypoxia and normoxia in multiple myeloma cells. This stabilized HIF-1α stimulates MM cell growth and survival. TRIM44 expression also promoted quiescent MM cell occupancy of the osteoblastic niche and bone destruction in xenograft mice.","method":"Co-immunoprecipitation, gain- and loss-of-function studies in MM cell lines, xenograft mouse model, western blotting","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with functional validation in vitro and in vivo across multiple orthogonal approaches","pmids":["30089913"],"is_preprint":false},{"year":2019,"finding":"TRIM44 directly binds and stabilizes TLR4 (Toll-like receptor 4), preventing its degradation, which activates the AKT/mTOR signaling pathway and induces epithelial-mesenchymal transition (EMT) to promote melanoma progression. TLR4 interference impeded TRIM44-induced tumor progression.","method":"Co-immunoprecipitation, mass spectrometric analysis, gain- and loss-of-function experiments, AKT inhibitor treatment, mouse xenograft models","journal":"Journal of experimental & clinical cancer research : CR","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with MS confirmation plus functional epistasis with inhibitor and in vivo validation","pmids":["30922374"],"is_preprint":false},{"year":2021,"finding":"TRIM44 links the ubiquitin-proteasome system (UPS) to autophagy by binding K48-linked ubiquitin chains on aggregated proteins. TRIM44 expression activates autophagy via promoting SQSTM1/p62 oligomerization, thereby increasing aggregate protein clearance (aggrephagy). UPS suppression leads to TRIM44 upregulation.","method":"Gain- and loss-of-function studies, western blotting, autophagy inhibitors (3-MA, chloroquine), fluorescence imaging of autophagosomes, co-immunoprecipitation","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including UPS inhibition, autophagy inhibitors, and direct binding assays in a single study","pmids":["34382902"],"is_preprint":false},{"year":2021,"finding":"TRIM44 deubiquitinates p62/SQSTM1, promoting its oligomerization and increasing its cytoplasmic retention upon irradiation. This cytoplasmic retention of p62 prevents degradation of FLNA and 53BP1, thereby enhancing DNA damage repair capacity in cancer cells.","method":"Co-immunoprecipitation, ubiquitination assay, immunofluorescence, western blotting, knockdown experiments with irradiation","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including functional deubiquitination assay, protein localization, and defined phenotypic readout (DNA damage repair)","pmids":["34211088"],"is_preprint":false},{"year":2022,"finding":"TRIM44 interacts with FLNA (Filamin A) and promotes its stability and deubiquitination, which in turn facilitates BRCA1 expression and homologous recombination repair, conferring cisplatin resistance in lung adenocarcinoma. BRCA1 depletion abolished TRIM44-modulated cisplatin resistance.","method":"Co-immunoprecipitation, microarray analysis, immunofluorescence, qRT-PCR, western blotting, xenograft models, STRING interaction analysis","journal":"International journal of biological sciences","confidence":"High","confidence_rationale":"Tier 2 — Co-IP plus functional epistasis (BRCA1 KD rescue) with in vivo validation","pmids":["35541909"],"is_preprint":false},{"year":2024,"finding":"TRIM44 promotes SQSTM1/p62 oligomerization in both PB1 domain-dependent and oxidation-dependent manners under oxidative stress. TRIM44 amplifies the interaction between protein kinase A and oligomerized SQSTM1, leading to enhanced phosphorylation of SQSTM1 at S349, which activates NFE2L2/NRF2 transcription factor and enhances autophagic degradation.","method":"Co-immunoprecipitation, western blotting, cell viability assays, phosphorylation analysis, gain- and loss-of-function in cancer cells treated with arsenic trioxide","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods but single lab study","pmids":["39152142"],"is_preprint":false},{"year":2024,"finding":"TRIM44 acts as a crucial mediator that recruits the MRN complex to damaged chromatin, independently of PARP1 activity. TRIM44 binds PARP1 via its ZnF UBP domain and regulates the ubiquitination-PARylation balance of PARP1, facilitating timely MRN complex recruitment for DSB repair. Upon PARP inhibitor treatment, TRIM44 shifts its binding from PARP1 to the MRN complex. Knockdown of TRIM44 enhances olaparib sensitivity and overcomes resistance induced by 53BP1 deficiency.","method":"Screen of 211 human ubiquitin-related proteins, Co-immunoprecipitation, domain mapping (ZnF UBP), knockdown experiments, PARP inhibitor sensitivity assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — systematic screen plus reciprocal Co-IP, domain mapping, and functional epistasis with defined pathway placement","pmids":["39217466"],"is_preprint":false},{"year":2014,"finding":"TRIM44 promotes lung cancer cell migration and invasion via activation of NF-κB signaling, with upregulation of CXCR6 and MMP9. Blocking NF-κB with the inhibitor PDTC reversed TRIM44-mediated upregulation of CXCR6 and MMP9 and alleviated the promotion of migration and invasion.","method":"Overexpression and siRNA knockdown in cell lines, qPCR, cell migration and invasion assays, NF-κB inhibitor (PDTC) treatment","journal":"International journal of clinical oncology","confidence":"Medium","confidence_rationale":"Tier 3 — pathway placement by pharmacological inhibitor without direct binding evidence; single lab study","pmids":["25345539"],"is_preprint":false},{"year":2016,"finding":"TRIM44 induces cell proliferation in lung cancer by accelerating G1/S transition via upregulation of cyclins and CDKs, and promotes EMT and metastasis. TRIM44-induced mTOR signaling, EMT, and cyclin/CDK upregulation were reversed by mTOR inhibitor treatment, placing TRIM44 upstream of mTOR.","method":"siRNA knockdown, overexpression, mTOR inhibitor treatment, cell cycle analysis, in vitro invasion assay, xenograft mouse model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 — pathway placement by pharmacological inhibitor; single lab, single method for mechanistic claim","pmids":["27058415"],"is_preprint":false},{"year":2023,"finding":"TRIM44 stabilizes TAK1 by inhibiting its K48-linked polyubiquitination-mediated proteasomal degradation, thereby increasing phosphorylated TAK1 expression in a fibrotic environment and activating MAPK pathways to promote cardiac fibrosis. Pharmacological inhibition of TAK1 phosphorylation reversed the fibrogenic effects of TRIM44 overexpression.","method":"Co-immunoprecipitation, ubiquitination assay, mouse MI model, TGF-β1 stimulation in cardiac fibroblasts, overexpression and knockdown, TAK1 inhibitor treatment","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 — direct ubiquitination assay, Co-IP, functional epistasis with pharmacological inhibitor, in vivo model","pmids":["37271349"],"is_preprint":false},{"year":2022,"finding":"TRIM44 directly binds LOXL2 and affects its protein stability, mediating extracellular matrix remodeling and T-cell-mediated antitumor immunity in gastric cancer. TRIM44 was found to regulate LOXL2 ubiquitination.","method":"Co-immunoprecipitation, immunofluorescence staining, ubiquitination assay, in vivo tumor models","journal":"Cellular oncology (Dordrecht, Netherlands)","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay but single lab study","pmids":["36512309"],"is_preprint":false},{"year":2020,"finding":"TRIM44 promotes renal cell carcinoma cell proliferation and migration by inhibiting FRK (Fyn-related kinase). FRK was identified as a target gene downregulated by TRIM44, and cell proliferation inhibited by TRIM44 knockdown was recovered by siFRK co-treatment.","method":"Integrated microarray analysis, gain- and loss-of-function studies, siRNA rescue experiments, Oncomine database analysis","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 3 — functional epistasis by siRNA rescue; no direct binding demonstrated; single lab","pmids":["31883420"],"is_preprint":false},{"year":2021,"finding":"TRIM44 promotes ovarian cancer proliferation, migration, and invasion by inhibiting FRK. ChIP assay was used to explore the association between TRIM44 and FRK transcriptional regulation.","method":"ChIP assay, knockdown and overexpression studies, xenograft models, colony formation and Transwell assays","journal":"Neoplasma","confidence":"Medium","confidence_rationale":"Tier 3 — ChIP for transcriptional regulation with functional validation; single lab","pmids":["34034495"],"is_preprint":false},{"year":2015,"finding":"Missense mutations in TRIM44 (p.S64Y and p.G155R) cause aniridia by impairing PAX6 expression. Overexpression of TRIM44 significantly reduced PAX6 expression in human lens epithelial cells, with the p.G155R mutant having a stronger suppressive effect than wildtype TRIM44.","method":"Luciferase reporter assay, western blotting with predicted microRNAs, overexpression of TRIM44 variants in human lens epithelial cells, genetic pedigree analysis","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 3 — overexpression functional assay in relevant cell type; single lab, limited mechanistic detail on how TRIM44 suppresses PAX6","pmids":["26394807"],"is_preprint":false},{"year":2022,"finding":"Cardiac-specific Trim44 knockout in rats attenuated isoproterenol-induced pathological cardiac remodeling by blocking the AKT/mTOR/GSK3β/P70S6K signaling pathway, establishing TRIM44 as a regulator of cardiac hypertrophy signaling.","method":"CRISPR-Cas9 cardiac-specific Trim44 knockout rats, isoproterenol treatment, morphological and functional cardiac assessment, western blotting of AKT/mTOR pathway components","journal":"Disease models & mechanisms","confidence":"High","confidence_rationale":"Tier 2 — genetic KO model with defined pathway readout and in vivo phenotypic validation","pmids":["35855640"],"is_preprint":false},{"year":2022,"finding":"TRIM44 interacts with FRS2 (Fibroblast Growth Factor Receptor Substrate 2) and negatively regulates the expression of BMP4, β-catenin, and TGF-βR1 in endometrial carcinoma cells. FRS2 knockdown reversed the effects of TRIM44 overexpression on cell proliferation, invasion, and apoptosis.","method":"Co-immunoprecipitation, western blotting, loss-of-function analysis, xenograft mouse model","journal":"Evidence-based complementary and alternative medicine : eCAM","confidence":"Low","confidence_rationale":"Tier 3 — single Co-IP with rescue experiment; paper was subsequently retracted (PMID:37501839)","pmids":["36387361"],"is_preprint":false},{"year":2025,"finding":"TRIM44 directly interacts with vimentin and promotes K48-linked polyubiquitination of vimentin through its B-box domain, targeting vimentin for proteasomal degradation. This functions as a tumor-suppressive mechanism in clear cell renal cell carcinoma.","method":"Co-immunoprecipitation, ubiquitination assay, domain mutagenesis (B-box domain), gain- and loss-of-function studies, in vitro and in vivo experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct ubiquitination assay with domain mutagenesis plus Co-IP and in vivo validation in a single study","pmids":["40967439"],"is_preprint":false},{"year":2025,"finding":"TRIM44 promotes DLBCL progression and confers chemoresistance to doxorubicin by increasing autophagic activity, evidenced by upregulated LC3II/LC3-I ratio, Beclin1 expression, and increased autophagosome formation. miR-665 directly targets TRIM44 (validated by miRNA pull-down and luciferase assay).","method":"Gain- and loss-of-function studies, western blotting for autophagy markers, autophagosome imaging, miRNA pull-down, luciferase reporter assay, xenograft model","journal":"Hematological oncology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods for autophagy activation; single lab","pmids":["40677140"],"is_preprint":false},{"year":2025,"finding":"TRIM44 promotes aggressive behaviors in multiple myeloma by deubiquitinating ZEB1, reducing its ubiquitination and enhancing ZEB1 protein stability.","method":"Co-immunoprecipitation followed by western blotting, ubiquitination assay, gain- and loss-of-function studies, xenograft models","journal":"Discover oncology","confidence":"Medium","confidence_rationale":"Tier 2 — direct ubiquitination assay with Co-IP; single lab study","pmids":["40014271"],"is_preprint":false},{"year":2024,"finding":"TRIM44 promotes rabies virus (RABV) replication by activating autophagy; inhibition of autophagy with 3-MA attenuated TRIM44-induced RABV replication, and rapamycin reversed TRIM44-knockdown-induced decreases in LC3B expression and autophagosome formation.","method":"RNA-seq identification, overexpression and knockdown of TRIM44 in NA cells, autophagy inhibitors (3-MA, rapamycin), LC3B assay, autophagosome quantification","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — functional autophagy assays with pharmacological epistasis; single lab","pmids":["38731834"],"is_preprint":false},{"year":2025,"finding":"TRIM44 inhibits NLRP3 inflammasome activation in renal ischemia-reperfusion injury. TRIM44 overexpression reduced NLRP3 and cleaved caspase-1 levels and decreased pyroptosis markers (GSDMD-N, IL-1β, IL-18); NLRP3 inhibition phenocopied TRIM44 overexpression.","method":"In vivo mouse IRI model with adenoviral TRIM44 delivery, hypoxia/reoxygenation in vitro, western blotting for pyroptosis markers, NLRP3 inhibitor treatment","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo and in vitro models with pharmacological epistasis; single lab","pmids":["39813853"],"is_preprint":false}],"current_model":"TRIM44 is a ZF UBP domain-containing deubiquitinase-like TRIM protein (lacking the canonical RING domain) that stabilizes binding partners including Terf/TRIM17, HIF-1α, TLR4, FLNA, TAK1, LOXL2, and ZEB1 by inhibiting their K48-linked ubiquitination and proteasomal degradation; it also deubiquitinates PARP1 and p62/SQSTM1 to regulate DNA damage repair (via MRN complex recruitment) and autophagy (via p62 oligomerization and NFE2L2 activation), placing TRIM44 at the intersection of the UPS, autophagy, and multiple oncogenic signaling pathways (AKT/mTOR, NF-κB, MAPK, Wnt/β-catenin)."},"narrative":{"teleology":[{"year":2009,"claim":"Establishing that TRIM44 is an atypical TRIM protein with deubiquitinase-like activity: the ZnF UBP domain was shown to inhibit ubiquitination of its partner TRIM17, preventing proteasomal degradation and positioning TRIM44 as a 'USP-like TRIM' rather than an E3 ligase.","evidence":"Co-immunoprecipitation, in vitro ubiquitination assay, and proteasome inhibitor treatment in mammalian cells","pmids":["19358823"],"confidence":"High","gaps":["No demonstration of direct deubiquitinase catalytic activity in a reconstituted system","Substrate specificity beyond TRIM17 unknown at this point"]},{"year":2015,"claim":"Linking TRIM44 to a Mendelian disorder: missense mutations in TRIM44 were identified as causative for aniridia, acting through suppression of PAX6 expression, though the molecular mechanism connecting TRIM44 to PAX6 transcriptional regulation remained unclear.","evidence":"Genetic pedigree analysis, luciferase reporter assay, and overexpression of TRIM44 variants in human lens epithelial cells","pmids":["26394807"],"confidence":"Medium","gaps":["Mechanism by which TRIM44 represses PAX6 expression not defined","No ubiquitination substrate identified in this context","Single family study"]},{"year":2016,"claim":"Expanding TRIM44's oncogenic role to signaling pathway activation: TRIM44 was placed upstream of mTOR and NF-κB signaling, driving cell cycle progression, EMT, and metastasis in lung cancer, establishing it as a pro-tumorigenic factor.","evidence":"siRNA knockdown, overexpression, pharmacological mTOR and NF-κB inhibitor reversal, cell cycle analysis, and xenograft models in lung cancer","pmids":["25345539","27058415"],"confidence":"Medium","gaps":["No direct binding partner identified mediating mTOR or NF-κB activation","Pathway placement based solely on pharmacological inhibitor reversal"]},{"year":2018,"claim":"Identifying HIF-1α as a direct deubiquitination target: TRIM44 stabilized HIF-1α under both normoxia and hypoxia in multiple myeloma, connecting its deubiquitinase-like function to tumor microenvironment adaptation and bone destruction.","evidence":"Co-immunoprecipitation, gain- and loss-of-function in MM cells, and xenograft mouse model","pmids":["30089913"],"confidence":"High","gaps":["Whether TRIM44 directly cleaves ubiquitin chains from HIF-1α or acts indirectly through a DUB recruitment mechanism not resolved","Specificity for K48 vs. other ubiquitin linkage types on HIF-1α not determined"]},{"year":2019,"claim":"Demonstrating substrate-level specificity in signaling: TRIM44 directly binds and stabilizes TLR4, activating AKT/mTOR and EMT in melanoma, showing that TRIM44's stabilization of different upstream receptors can converge on common oncogenic pathways.","evidence":"Co-immunoprecipitation with mass spectrometry confirmation, AKT inhibitor epistasis, and mouse xenograft models","pmids":["30922374"],"confidence":"High","gaps":["Whether TRIM44 deubiquitinates TLR4 directly or blocks its ubiquitination by an E3 ligase not distinguished"]},{"year":2021,"claim":"Defining the UPS–autophagy bridge: TRIM44 was shown to bind K48-linked ubiquitin chains on aggregated proteins and promote p62/SQSTM1 oligomerization, activating aggrephagy; separately, TRIM44 deubiquitination of p62 enhanced DNA damage repair through FLNA and 53BP1 stabilization.","evidence":"Gain/loss-of-function, autophagy inhibitors (3-MA, chloroquine), ubiquitination assays, immunofluorescence, and irradiation-based DNA damage assays","pmids":["34382902","34211088"],"confidence":"High","gaps":["Whether TRIM44 is a bona fide deubiquitinase with catalytic activity toward p62 or acts as a scaffold remains unresolved","Structural basis for K48-linked ubiquitin chain recognition not determined"]},{"year":2022,"claim":"Broadening substrate repertoire to extracellular matrix and cardiac signaling: TRIM44 stabilizes FLNA to promote BRCA1-dependent HR repair and cisplatin resistance; stabilizes LOXL2 to remodel the tumor extracellular matrix and suppress antitumor immunity; and drives pathological cardiac hypertrophy through AKT/mTOR/GSK3β signaling in vivo.","evidence":"Co-immunoprecipitation, ubiquitination assays, CRISPR cardiac-specific knockout rats, xenograft models, and pharmacological epistasis","pmids":["35541909","36512309","35855640"],"confidence":"High","gaps":["Cardiac substrates directly deubiquitinated by TRIM44 not identified","Relationship between TRIM44's E3-like (B-box) and DUB-like (ZnF UBP) activities in the same cellular context unclear"]},{"year":2023,"claim":"Identifying TAK1 as a substrate connecting TRIM44 to inflammatory MAPK signaling: TRIM44 inhibits K48-linked polyubiquitination of TAK1, sustaining TAK1 phosphorylation and MAPK activation to promote cardiac fibrosis.","evidence":"Co-immunoprecipitation, ubiquitination assay, mouse myocardial infarction model, TGF-β1 stimulation, and TAK1 inhibitor epistasis","pmids":["37271349"],"confidence":"High","gaps":["Whether TRIM44 directly deubiquitinates TAK1 or competes with a K48-specific E3 ligase not resolved"]},{"year":2024,"claim":"Establishing TRIM44 as a chromatin-proximal DNA repair factor: TRIM44 binds PARP1 via its ZnF UBP domain to regulate the ubiquitination–PARylation balance and recruits the MRN complex to DSBs independently of PARP1 activity, creating a mechanism for PARP inhibitor resistance.","evidence":"Systematic screen of 211 ubiquitin-related proteins, Co-IP, domain mapping, knockdown with PARP inhibitor sensitivity assays","pmids":["39217466"],"confidence":"High","gaps":["Structural basis for ZnF UBP recognition of PARP1 not determined","Whether TRIM44-MRN interaction is direct or mediated by chromatin-associated factors not established"]},{"year":2024,"claim":"Refining the p62 signaling axis under oxidative stress: TRIM44 promotes p62 oligomerization through both PB1-dependent and oxidation-dependent mechanisms, amplifying PKA-mediated p62 S349 phosphorylation to activate NRF2, connecting TRIM44 to antioxidant transcriptional responses.","evidence":"Co-immunoprecipitation, phosphorylation analysis, arsenic trioxide treatment in cancer cells","pmids":["39152142"],"confidence":"Medium","gaps":["Single lab study; PKA–TRIM44–p62 interaction topology not mapped","Whether NRF2 activation is a general TRIM44 function or context-specific not established"]},{"year":2025,"claim":"Revealing an unexpected E3-like activity: TRIM44's B-box domain promotes K48-linked polyubiquitination and proteasomal degradation of vimentin, acting as a tumor suppressor in clear cell RCC — contrasting with its deubiquitinase-like role on other substrates.","evidence":"Co-immunoprecipitation, ubiquitination assay with B-box domain mutagenesis, in vitro and in vivo experiments","pmids":["40967439"],"confidence":"High","gaps":["Whether the B-box domain functions as a direct E3 ligase or recruits an E3 partner not resolved","How substrate selection between stabilization and degradation pathways is determined is unknown"]},{"year":null,"claim":"The fundamental question of whether TRIM44 possesses intrinsic deubiquitinase catalytic activity (via its ZnF UBP domain) or acts exclusively as a ubiquitin-binding scaffold that shields substrates from E3 ligases remains unresolved, as does the structural and regulatory basis for context-dependent switching between its deubiquitinase-like and E3-like activities.","evidence":"","pmids":[],"confidence":"High","gaps":["No in vitro reconstitution with purified TRIM44 demonstrating catalytic DUB activity","No crystal or cryo-EM structure available","Decision mechanism for substrate stabilization vs. degradation unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1,4,7,19]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,4,10,17,19]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,6,7]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,4,6]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[3,4,6,18,20]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,10,17,19]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[4,5,7]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,8,9,15]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[6,21]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[21]}],"complexes":[],"partners":["SQSTM1","PARP1","FLNA","HIF1A","TLR4","MAP3K7","VIM","ZEB1"],"other_free_text":[]},"mechanistic_narrative":"TRIM44 is an atypical TRIM family protein that, through its ZnF UBP domain, functions as a deubiquitinase-like regulator of protein stability, autophagy, and DNA damage repair. TRIM44 stabilizes diverse substrates—including TRIM17, HIF-1α, TLR4, TAK1, LOXL2, ZEB1, and FLNA—by removing or inhibiting their K48-linked polyubiquitination, thereby preventing proteasomal degradation and activating downstream AKT/mTOR, NF-κB, and MAPK signaling cascades [PMID:19358823, PMID:30089913, PMID:30922374, PMID:37271349, PMID:40014271]. TRIM44 also deubiquitinates SQSTM1/p62, promoting its oligomerization to activate selective autophagy (aggrephagy) and NFE2L2/NRF2-mediated stress responses, while its B-box domain can conversely promote K48-linked ubiquitination and degradation of vimentin [PMID:34382902, PMID:39152142, PMID:40967439]. In DNA damage repair, TRIM44 binds PARP1 via its ZnF UBP domain to regulate the ubiquitination–PARylation balance and recruits the MRN complex to damaged chromatin independently of PARP1 catalytic activity, conferring PARP inhibitor resistance [PMID:39217466]. Missense mutations in TRIM44 (p.S64Y, p.G155R) cause aniridia through impaired PAX6 expression [PMID:26394807]."},"prefetch_data":{"uniprot":{"accession":"Q96DX7","full_name":"Tripartite motif-containing protein 44","aliases":["Protein DIPB"],"length_aa":344,"mass_kda":38.5,"function":"May play a role in the process of differentiation and maturation of neuronal cells (By similarity). May regulate the activity of TRIM17. Is a negative regulator of PAX6 expression (PubMed:26394807)","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q96DX7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRIM44","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRIM44","total_profiled":1310},"omim":[{"mim_id":"617142","title":"ANIRIDIA 3; AN3","url":"https://www.omim.org/entry/617142"},{"mim_id":"612298","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 44; TRIM44","url":"https://www.omim.org/entry/612298"},{"mim_id":"106210","title":"ANIRIDIA 1; AN1","url":"https://www.omim.org/entry/106210"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRIM44"},"hgnc":{"alias_symbol":["DIPB","MC7"],"prev_symbol":[]},"alphafold":{"accession":"Q96DX7","domains":[{"cath_id":"3.30.160.60","chopping":"167-213","consensus_level":"medium","plddt":88.5091,"start":167,"end":213},{"cath_id":"3.30.160","chopping":"14-61","consensus_level":"medium","plddt":84.3192,"start":14,"end":61},{"cath_id":"1.20.58","chopping":"215-320","consensus_level":"medium","plddt":93.6608,"start":215,"end":320}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96DX7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96DX7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96DX7-F1-predicted_aligned_error_v6.png","plddt_mean":73.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRIM44","jax_strain_url":"https://www.jax.org/strain/search?query=TRIM44"},"sequence":{"accession":"Q96DX7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96DX7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96DX7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96DX7"}},"corpus_meta":[{"pmid":"22862969","id":"PMC_22862969","title":"Overexpression of TRIM44 contributes to malignant outcome in gastric carcinoma.","date":"2012","source":"Cancer science","url":"https://pubmed.ncbi.nlm.nih.gov/22862969","citation_count":73,"is_preprint":false},{"pmid":"31873114","id":"PMC_31873114","title":"miR-192-5p suppresses the progression of lung cancer bone metastasis by targeting TRIM44.","date":"2019","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/31873114","citation_count":64,"is_preprint":false},{"pmid":"30922374","id":"PMC_30922374","title":"TRIM44 activates the AKT/mTOR signal pathway to induce melanoma progression by stabilizing TLR4.","date":"2019","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/30922374","citation_count":58,"is_preprint":false},{"pmid":"25345539","id":"PMC_25345539","title":"Trim44 facilitates the migration and invasion of human lung cancer cells via the NF-κB signaling pathway.","date":"2014","source":"International journal of clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/25345539","citation_count":57,"is_preprint":false},{"pmid":"30098109","id":"PMC_30098109","title":"TRIM44 promotes human esophageal cancer progression via the AKT/mTOR pathway.","date":"2018","source":"Cancer science","url":"https://pubmed.ncbi.nlm.nih.gov/30098109","citation_count":55,"is_preprint":false},{"pmid":"30539341","id":"PMC_30539341","title":"MiR-101-3p inhibits EMT to attenuate proliferation and metastasis in glioblastoma by targeting TRIM44.","date":"2018","source":"Journal of neuro-oncology","url":"https://pubmed.ncbi.nlm.nih.gov/30539341","citation_count":55,"is_preprint":false},{"pmid":"27058415","id":"PMC_27058415","title":"TRIM44 promotes proliferation and metastasis in non‑small cell lung cancer via mTOR signaling pathway.","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/27058415","citation_count":52,"is_preprint":false},{"pmid":"29446253","id":"PMC_29446253","title":"Elevated TRIM44 promotes 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TRIM44 inhibits ubiquitination of terf, preventing its proteasomal degradation. The N-terminal zinc-finger domain found in ubiquitin hydrolases (ZF UBP) of TRIM44 was proposed to mediate this deubiquitinase-like activity, classifying TRIM44 as a 'USP-like-TRIM' that regulates associated TRIM proteins.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, proteasome inhibitor treatment in mammalian cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro ubiquitination assay plus pulldown and functional cell-based validation in a single study\",\n      \"pmids\": [\"19358823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRIM44 functions as a deubiquitinase for HIF-1α, stabilizing HIF-1α expression during both hypoxia and normoxia in multiple myeloma cells. This stabilized HIF-1α stimulates MM cell growth and survival. TRIM44 expression also promoted quiescent MM cell occupancy of the osteoblastic niche and bone destruction in xenograft mice.\",\n      \"method\": \"Co-immunoprecipitation, gain- and loss-of-function studies in MM cell lines, xenograft mouse model, western blotting\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with functional validation in vitro and in vivo across multiple orthogonal approaches\",\n      \"pmids\": [\"30089913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM44 directly binds and stabilizes TLR4 (Toll-like receptor 4), preventing its degradation, which activates the AKT/mTOR signaling pathway and induces epithelial-mesenchymal transition (EMT) to promote melanoma progression. TLR4 interference impeded TRIM44-induced tumor progression.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometric analysis, gain- and loss-of-function experiments, AKT inhibitor treatment, mouse xenograft models\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with MS confirmation plus functional epistasis with inhibitor and in vivo validation\",\n      \"pmids\": [\"30922374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM44 links the ubiquitin-proteasome system (UPS) to autophagy by binding K48-linked ubiquitin chains on aggregated proteins. TRIM44 expression activates autophagy via promoting SQSTM1/p62 oligomerization, thereby increasing aggregate protein clearance (aggrephagy). UPS suppression leads to TRIM44 upregulation.\",\n      \"method\": \"Gain- and loss-of-function studies, western blotting, autophagy inhibitors (3-MA, chloroquine), fluorescence imaging of autophagosomes, co-immunoprecipitation\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including UPS inhibition, autophagy inhibitors, and direct binding assays in a single study\",\n      \"pmids\": [\"34382902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM44 deubiquitinates p62/SQSTM1, promoting its oligomerization and increasing its cytoplasmic retention upon irradiation. This cytoplasmic retention of p62 prevents degradation of FLNA and 53BP1, thereby enhancing DNA damage repair capacity in cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, immunofluorescence, western blotting, knockdown experiments with irradiation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including functional deubiquitination assay, protein localization, and defined phenotypic readout (DNA damage repair)\",\n      \"pmids\": [\"34211088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM44 interacts with FLNA (Filamin A) and promotes its stability and deubiquitination, which in turn facilitates BRCA1 expression and homologous recombination repair, conferring cisplatin resistance in lung adenocarcinoma. BRCA1 depletion abolished TRIM44-modulated cisplatin resistance.\",\n      \"method\": \"Co-immunoprecipitation, microarray analysis, immunofluorescence, qRT-PCR, western blotting, xenograft models, STRING interaction analysis\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional epistasis (BRCA1 KD rescue) with in vivo validation\",\n      \"pmids\": [\"35541909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM44 promotes SQSTM1/p62 oligomerization in both PB1 domain-dependent and oxidation-dependent manners under oxidative stress. TRIM44 amplifies the interaction between protein kinase A and oligomerized SQSTM1, leading to enhanced phosphorylation of SQSTM1 at S349, which activates NFE2L2/NRF2 transcription factor and enhances autophagic degradation.\",\n      \"method\": \"Co-immunoprecipitation, western blotting, cell viability assays, phosphorylation analysis, gain- and loss-of-function in cancer cells treated with arsenic trioxide\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods but single lab study\",\n      \"pmids\": [\"39152142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM44 acts as a crucial mediator that recruits the MRN complex to damaged chromatin, independently of PARP1 activity. TRIM44 binds PARP1 via its ZnF UBP domain and regulates the ubiquitination-PARylation balance of PARP1, facilitating timely MRN complex recruitment for DSB repair. Upon PARP inhibitor treatment, TRIM44 shifts its binding from PARP1 to the MRN complex. Knockdown of TRIM44 enhances olaparib sensitivity and overcomes resistance induced by 53BP1 deficiency.\",\n      \"method\": \"Screen of 211 human ubiquitin-related proteins, Co-immunoprecipitation, domain mapping (ZnF UBP), knockdown experiments, PARP inhibitor sensitivity assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic screen plus reciprocal Co-IP, domain mapping, and functional epistasis with defined pathway placement\",\n      \"pmids\": [\"39217466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRIM44 promotes lung cancer cell migration and invasion via activation of NF-κB signaling, with upregulation of CXCR6 and MMP9. Blocking NF-κB with the inhibitor PDTC reversed TRIM44-mediated upregulation of CXCR6 and MMP9 and alleviated the promotion of migration and invasion.\",\n      \"method\": \"Overexpression and siRNA knockdown in cell lines, qPCR, cell migration and invasion assays, NF-κB inhibitor (PDTC) treatment\",\n      \"journal\": \"International journal of clinical oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pathway placement by pharmacological inhibitor without direct binding evidence; single lab study\",\n      \"pmids\": [\"25345539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIM44 induces cell proliferation in lung cancer by accelerating G1/S transition via upregulation of cyclins and CDKs, and promotes EMT and metastasis. TRIM44-induced mTOR signaling, EMT, and cyclin/CDK upregulation were reversed by mTOR inhibitor treatment, placing TRIM44 upstream of mTOR.\",\n      \"method\": \"siRNA knockdown, overexpression, mTOR inhibitor treatment, cell cycle analysis, in vitro invasion assay, xenograft mouse model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pathway placement by pharmacological inhibitor; single lab, single method for mechanistic claim\",\n      \"pmids\": [\"27058415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM44 stabilizes TAK1 by inhibiting its K48-linked polyubiquitination-mediated proteasomal degradation, thereby increasing phosphorylated TAK1 expression in a fibrotic environment and activating MAPK pathways to promote cardiac fibrosis. Pharmacological inhibition of TAK1 phosphorylation reversed the fibrogenic effects of TRIM44 overexpression.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, mouse MI model, TGF-β1 stimulation in cardiac fibroblasts, overexpression and knockdown, TAK1 inhibitor treatment\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct ubiquitination assay, Co-IP, functional epistasis with pharmacological inhibitor, in vivo model\",\n      \"pmids\": [\"37271349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM44 directly binds LOXL2 and affects its protein stability, mediating extracellular matrix remodeling and T-cell-mediated antitumor immunity in gastric cancer. TRIM44 was found to regulate LOXL2 ubiquitination.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence staining, ubiquitination assay, in vivo tumor models\",\n      \"journal\": \"Cellular oncology (Dordrecht, Netherlands)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay but single lab study\",\n      \"pmids\": [\"36512309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRIM44 promotes renal cell carcinoma cell proliferation and migration by inhibiting FRK (Fyn-related kinase). FRK was identified as a target gene downregulated by TRIM44, and cell proliferation inhibited by TRIM44 knockdown was recovered by siFRK co-treatment.\",\n      \"method\": \"Integrated microarray analysis, gain- and loss-of-function studies, siRNA rescue experiments, Oncomine database analysis\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional epistasis by siRNA rescue; no direct binding demonstrated; single lab\",\n      \"pmids\": [\"31883420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM44 promotes ovarian cancer proliferation, migration, and invasion by inhibiting FRK. ChIP assay was used to explore the association between TRIM44 and FRK transcriptional regulation.\",\n      \"method\": \"ChIP assay, knockdown and overexpression studies, xenograft models, colony formation and Transwell assays\",\n      \"journal\": \"Neoplasma\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — ChIP for transcriptional regulation with functional validation; single lab\",\n      \"pmids\": [\"34034495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Missense mutations in TRIM44 (p.S64Y and p.G155R) cause aniridia by impairing PAX6 expression. Overexpression of TRIM44 significantly reduced PAX6 expression in human lens epithelial cells, with the p.G155R mutant having a stronger suppressive effect than wildtype TRIM44.\",\n      \"method\": \"Luciferase reporter assay, western blotting with predicted microRNAs, overexpression of TRIM44 variants in human lens epithelial cells, genetic pedigree analysis\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — overexpression functional assay in relevant cell type; single lab, limited mechanistic detail on how TRIM44 suppresses PAX6\",\n      \"pmids\": [\"26394807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cardiac-specific Trim44 knockout in rats attenuated isoproterenol-induced pathological cardiac remodeling by blocking the AKT/mTOR/GSK3β/P70S6K signaling pathway, establishing TRIM44 as a regulator of cardiac hypertrophy signaling.\",\n      \"method\": \"CRISPR-Cas9 cardiac-specific Trim44 knockout rats, isoproterenol treatment, morphological and functional cardiac assessment, western blotting of AKT/mTOR pathway components\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO model with defined pathway readout and in vivo phenotypic validation\",\n      \"pmids\": [\"35855640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM44 interacts with FRS2 (Fibroblast Growth Factor Receptor Substrate 2) and negatively regulates the expression of BMP4, β-catenin, and TGF-βR1 in endometrial carcinoma cells. FRS2 knockdown reversed the effects of TRIM44 overexpression on cell proliferation, invasion, and apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, western blotting, loss-of-function analysis, xenograft mouse model\",\n      \"journal\": \"Evidence-based complementary and alternative medicine : eCAM\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP with rescue experiment; paper was subsequently retracted (PMID:37501839)\",\n      \"pmids\": [\"36387361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM44 directly interacts with vimentin and promotes K48-linked polyubiquitination of vimentin through its B-box domain, targeting vimentin for proteasomal degradation. This functions as a tumor-suppressive mechanism in clear cell renal cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, domain mutagenesis (B-box domain), gain- and loss-of-function studies, in vitro and in vivo experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct ubiquitination assay with domain mutagenesis plus Co-IP and in vivo validation in a single study\",\n      \"pmids\": [\"40967439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM44 promotes DLBCL progression and confers chemoresistance to doxorubicin by increasing autophagic activity, evidenced by upregulated LC3II/LC3-I ratio, Beclin1 expression, and increased autophagosome formation. miR-665 directly targets TRIM44 (validated by miRNA pull-down and luciferase assay).\",\n      \"method\": \"Gain- and loss-of-function studies, western blotting for autophagy markers, autophagosome imaging, miRNA pull-down, luciferase reporter assay, xenograft model\",\n      \"journal\": \"Hematological oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods for autophagy activation; single lab\",\n      \"pmids\": [\"40677140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM44 promotes aggressive behaviors in multiple myeloma by deubiquitinating ZEB1, reducing its ubiquitination and enhancing ZEB1 protein stability.\",\n      \"method\": \"Co-immunoprecipitation followed by western blotting, ubiquitination assay, gain- and loss-of-function studies, xenograft models\",\n      \"journal\": \"Discover oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct ubiquitination assay with Co-IP; single lab study\",\n      \"pmids\": [\"40014271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM44 promotes rabies virus (RABV) replication by activating autophagy; inhibition of autophagy with 3-MA attenuated TRIM44-induced RABV replication, and rapamycin reversed TRIM44-knockdown-induced decreases in LC3B expression and autophagosome formation.\",\n      \"method\": \"RNA-seq identification, overexpression and knockdown of TRIM44 in NA cells, autophagy inhibitors (3-MA, rapamycin), LC3B assay, autophagosome quantification\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional autophagy assays with pharmacological epistasis; single lab\",\n      \"pmids\": [\"38731834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM44 inhibits NLRP3 inflammasome activation in renal ischemia-reperfusion injury. TRIM44 overexpression reduced NLRP3 and cleaved caspase-1 levels and decreased pyroptosis markers (GSDMD-N, IL-1β, IL-18); NLRP3 inhibition phenocopied TRIM44 overexpression.\",\n      \"method\": \"In vivo mouse IRI model with adenoviral TRIM44 delivery, hypoxia/reoxygenation in vitro, western blotting for pyroptosis markers, NLRP3 inhibitor treatment\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and in vitro models with pharmacological epistasis; single lab\",\n      \"pmids\": [\"39813853\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIM44 is a ZF UBP domain-containing deubiquitinase-like TRIM protein (lacking the canonical RING domain) that stabilizes binding partners including Terf/TRIM17, HIF-1α, TLR4, FLNA, TAK1, LOXL2, and ZEB1 by inhibiting their K48-linked ubiquitination and proteasomal degradation; it also deubiquitinates PARP1 and p62/SQSTM1 to regulate DNA damage repair (via MRN complex recruitment) and autophagy (via p62 oligomerization and NFE2L2 activation), placing TRIM44 at the intersection of the UPS, autophagy, and multiple oncogenic signaling pathways (AKT/mTOR, NF-κB, MAPK, Wnt/β-catenin).\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRIM44 is an atypical TRIM family protein that, through its ZnF UBP domain, functions as a deubiquitinase-like regulator of protein stability, autophagy, and DNA damage repair. TRIM44 stabilizes diverse substrates—including TRIM17, HIF-1α, TLR4, TAK1, LOXL2, ZEB1, and FLNA—by removing or inhibiting their K48-linked polyubiquitination, thereby preventing proteasomal degradation and activating downstream AKT/mTOR, NF-κB, and MAPK signaling cascades [PMID:19358823, PMID:30089913, PMID:30922374, PMID:37271349, PMID:40014271]. TRIM44 also deubiquitinates SQSTM1/p62, promoting its oligomerization to activate selective autophagy (aggrephagy) and NFE2L2/NRF2-mediated stress responses, while its B-box domain can conversely promote K48-linked ubiquitination and degradation of vimentin [PMID:34382902, PMID:39152142, PMID:40967439]. In DNA damage repair, TRIM44 binds PARP1 via its ZnF UBP domain to regulate the ubiquitination–PARylation balance and recruits the MRN complex to damaged chromatin independently of PARP1 catalytic activity, conferring PARP inhibitor resistance [PMID:39217466]. Missense mutations in TRIM44 (p.S64Y, p.G155R) cause aniridia through impaired PAX6 expression [PMID:26394807].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing that TRIM44 is an atypical TRIM protein with deubiquitinase-like activity: the ZnF UBP domain was shown to inhibit ubiquitination of its partner TRIM17, preventing proteasomal degradation and positioning TRIM44 as a 'USP-like TRIM' rather than an E3 ligase.\",\n      \"evidence\": \"Co-immunoprecipitation, in vitro ubiquitination assay, and proteasome inhibitor treatment in mammalian cells\",\n      \"pmids\": [\"19358823\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No demonstration of direct deubiquitinase catalytic activity in a reconstituted system\", \"Substrate specificity beyond TRIM17 unknown at this point\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linking TRIM44 to a Mendelian disorder: missense mutations in TRIM44 were identified as causative for aniridia, acting through suppression of PAX6 expression, though the molecular mechanism connecting TRIM44 to PAX6 transcriptional regulation remained unclear.\",\n      \"evidence\": \"Genetic pedigree analysis, luciferase reporter assay, and overexpression of TRIM44 variants in human lens epithelial cells\",\n      \"pmids\": [\"26394807\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which TRIM44 represses PAX6 expression not defined\", \"No ubiquitination substrate identified in this context\", \"Single family study\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Expanding TRIM44's oncogenic role to signaling pathway activation: TRIM44 was placed upstream of mTOR and NF-κB signaling, driving cell cycle progression, EMT, and metastasis in lung cancer, establishing it as a pro-tumorigenic factor.\",\n      \"evidence\": \"siRNA knockdown, overexpression, pharmacological mTOR and NF-κB inhibitor reversal, cell cycle analysis, and xenograft models in lung cancer\",\n      \"pmids\": [\"25345539\", \"27058415\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct binding partner identified mediating mTOR or NF-κB activation\", \"Pathway placement based solely on pharmacological inhibitor reversal\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying HIF-1α as a direct deubiquitination target: TRIM44 stabilized HIF-1α under both normoxia and hypoxia in multiple myeloma, connecting its deubiquitinase-like function to tumor microenvironment adaptation and bone destruction.\",\n      \"evidence\": \"Co-immunoprecipitation, gain- and loss-of-function in MM cells, and xenograft mouse model\",\n      \"pmids\": [\"30089913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRIM44 directly cleaves ubiquitin chains from HIF-1α or acts indirectly through a DUB recruitment mechanism not resolved\", \"Specificity for K48 vs. other ubiquitin linkage types on HIF-1α not determined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating substrate-level specificity in signaling: TRIM44 directly binds and stabilizes TLR4, activating AKT/mTOR and EMT in melanoma, showing that TRIM44's stabilization of different upstream receptors can converge on common oncogenic pathways.\",\n      \"evidence\": \"Co-immunoprecipitation with mass spectrometry confirmation, AKT inhibitor epistasis, and mouse xenograft models\",\n      \"pmids\": [\"30922374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRIM44 deubiquitinates TLR4 directly or blocks its ubiquitination by an E3 ligase not distinguished\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defining the UPS–autophagy bridge: TRIM44 was shown to bind K48-linked ubiquitin chains on aggregated proteins and promote p62/SQSTM1 oligomerization, activating aggrephagy; separately, TRIM44 deubiquitination of p62 enhanced DNA damage repair through FLNA and 53BP1 stabilization.\",\n      \"evidence\": \"Gain/loss-of-function, autophagy inhibitors (3-MA, chloroquine), ubiquitination assays, immunofluorescence, and irradiation-based DNA damage assays\",\n      \"pmids\": [\"34382902\", \"34211088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRIM44 is a bona fide deubiquitinase with catalytic activity toward p62 or acts as a scaffold remains unresolved\", \"Structural basis for K48-linked ubiquitin chain recognition not determined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Broadening substrate repertoire to extracellular matrix and cardiac signaling: TRIM44 stabilizes FLNA to promote BRCA1-dependent HR repair and cisplatin resistance; stabilizes LOXL2 to remodel the tumor extracellular matrix and suppress antitumor immunity; and drives pathological cardiac hypertrophy through AKT/mTOR/GSK3β signaling in vivo.\",\n      \"evidence\": \"Co-immunoprecipitation, ubiquitination assays, CRISPR cardiac-specific knockout rats, xenograft models, and pharmacological epistasis\",\n      \"pmids\": [\"35541909\", \"36512309\", \"35855640\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cardiac substrates directly deubiquitinated by TRIM44 not identified\", \"Relationship between TRIM44's E3-like (B-box) and DUB-like (ZnF UBP) activities in the same cellular context unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identifying TAK1 as a substrate connecting TRIM44 to inflammatory MAPK signaling: TRIM44 inhibits K48-linked polyubiquitination of TAK1, sustaining TAK1 phosphorylation and MAPK activation to promote cardiac fibrosis.\",\n      \"evidence\": \"Co-immunoprecipitation, ubiquitination assay, mouse myocardial infarction model, TGF-β1 stimulation, and TAK1 inhibitor epistasis\",\n      \"pmids\": [\"37271349\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRIM44 directly deubiquitinates TAK1 or competes with a K48-specific E3 ligase not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Establishing TRIM44 as a chromatin-proximal DNA repair factor: TRIM44 binds PARP1 via its ZnF UBP domain to regulate the ubiquitination–PARylation balance and recruits the MRN complex to DSBs independently of PARP1 activity, creating a mechanism for PARP inhibitor resistance.\",\n      \"evidence\": \"Systematic screen of 211 ubiquitin-related proteins, Co-IP, domain mapping, knockdown with PARP inhibitor sensitivity assays\",\n      \"pmids\": [\"39217466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for ZnF UBP recognition of PARP1 not determined\", \"Whether TRIM44-MRN interaction is direct or mediated by chromatin-associated factors not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Refining the p62 signaling axis under oxidative stress: TRIM44 promotes p62 oligomerization through both PB1-dependent and oxidation-dependent mechanisms, amplifying PKA-mediated p62 S349 phosphorylation to activate NRF2, connecting TRIM44 to antioxidant transcriptional responses.\",\n      \"evidence\": \"Co-immunoprecipitation, phosphorylation analysis, arsenic trioxide treatment in cancer cells\",\n      \"pmids\": [\"39152142\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab study; PKA–TRIM44–p62 interaction topology not mapped\", \"Whether NRF2 activation is a general TRIM44 function or context-specific not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealing an unexpected E3-like activity: TRIM44's B-box domain promotes K48-linked polyubiquitination and proteasomal degradation of vimentin, acting as a tumor suppressor in clear cell RCC — contrasting with its deubiquitinase-like role on other substrates.\",\n      \"evidence\": \"Co-immunoprecipitation, ubiquitination assay with B-box domain mutagenesis, in vitro and in vivo experiments\",\n      \"pmids\": [\"40967439\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the B-box domain functions as a direct E3 ligase or recruits an E3 partner not resolved\", \"How substrate selection between stabilization and degradation pathways is determined is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The fundamental question of whether TRIM44 possesses intrinsic deubiquitinase catalytic activity (via its ZnF UBP domain) or acts exclusively as a ubiquitin-binding scaffold that shields substrates from E3 ligases remains unresolved, as does the structural and regulatory basis for context-dependent switching between its deubiquitinase-like and E3-like activities.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vitro reconstitution with purified TRIM44 demonstrating catalytic DUB activity\", \"No crystal or cryo-EM structure available\", \"Decision mechanism for substrate stabilization vs. degradation unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 4, 7, 19]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 4, 10, 17, 19]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 6, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 4, 6]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3, 4, 6, 18, 20]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 10, 17, 19]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [4, 5, 7]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 8, 9, 15]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [6, 21]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [21]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SQSTM1\",\n      \"PARP1\",\n      \"FLNA\",\n      \"HIF1A\",\n      \"TLR4\",\n      \"MAP3K7\",\n      \"VIM\",\n      \"ZEB1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}