{"gene":"TNFAIP2","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":1994,"finding":"B94/TNFAIP2 is a primary response gene induced by TNF-α in endothelial cells; the mouse homologue is expressed in hematopoietic tissues and the sperm acrosome, with a truncated testis-specific transcript arising from an alternate polyadenylation signal within the open reading frame. Immunostaining localized B94 protein to the acrosomal compartment of mature sperm.","method":"In situ hybridization, Northern blot, affinity-purified polyclonal antiserum immunostaining, mouse chromosomal mapping","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization by immunostaining and expression mapping with functional context, single lab","pmids":["8106408"],"is_preprint":false},{"year":2000,"finding":"TNFAIP2 (B94) is a retinoic acid target gene in acute promyelocytic leukemia cells expressing PML-RARα; induction is rapid (within 1 h), does not require new protein synthesis, is blocked by actinomycin D, and is dependent on the PML coiled-coil domain of PML-RARα, indicating direct transcriptional activation.","method":"cDNA microarray, quantitative RT-PCR, actinomycin D and cycloheximide inhibition assays in TF1-PR cells","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple inhibitor experiments establishing transcriptional mechanism, single lab","pmids":["10766166"],"is_preprint":false},{"year":2010,"finding":"Knockdown of TNFAIP2 by siRNA dramatically reduces migration and invasion of nasopharyngeal carcinoma HK1 cells, establishing a direct role for TNFAIP2 in promoting cell motility.","method":"siRNA knockdown, transwell migration and invasion assays","journal":"Modern pathology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotype, single lab","pmids":["21057457"],"is_preprint":false},{"year":2013,"finding":"The EBV oncoprotein LMP1 transcriptionally induces TNFAIP2 expression through its CTAR2 domain via NF-κB; a specific NF-κB binding site was identified at −3,869 to −3,860 bp of the TNFAIP2 promoter. TNFAIP2 associates with actin (co-immunoprecipitation), participates in actin-based membrane protrusion formation, and promotes LMP1-induced cell motility.","method":"Quantitative RT-PCR, Western blot, luciferase reporter assay, NF-κB inhibition, p65 siRNA knockdown, co-immunoprecipitation, immunofluorescence microscopy, transwell migration assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods including promoter mapping, co-IP, and functional migration assay in single study","pmids":["23975427"],"is_preprint":false},{"year":2015,"finding":"KLF5 directly binds the TNFAIP2 gene promoter and activates its transcription; TNFAIP2 in turn interacts with the small GTPases Rac1 and Cdc42, increasing their activities to alter the actin cytoskeleton and cell morphology, thereby promoting breast cancer cell proliferation, migration, and invasion.","method":"ChIP assay, luciferase reporter assay, co-immunoprecipitation, GTPase activity assays (Rac1/Cdc42 pull-down), siRNA knockdown, cell migration/invasion assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP, co-IP, GTPase activity assay, and functional rescue experiments with multiple orthogonal methods","pmids":["26189798"],"is_preprint":false},{"year":2015,"finding":"TNFAIP2 inhibits NF-κB activity and downstream IL-8 production, acting as an autoinhibitor of the early TNFα response. A genetic variant (rs8126) that increases TNFAIP2 expression correlates with decreased IL-8 and worse survival in septic shock patients.","method":"In vitro microarray gene expression, NF-κB reporter assay, cytokine measurement (IL-8), genetic association study","journal":"Journal of innate immunity","confidence":"Medium","confidence_rationale":"Tier 2–3 — NF-κB reporter assay combined with genetic variant data, single lab","pmids":["26347487"],"is_preprint":false},{"year":2016,"finding":"TNFAIP2 expression is induced by Legionella pneumophila infection in macrophages via NF-κB-dependent transcription (histone H4 acetylation at the TNFAIP2 promoter detected by ChIP-seq); knockdown of TNFAIP2 reduces intracellular L. pneumophila replication, indicating a pro-bacterial role.","method":"ChIP-seq (H4 acetylation), qRT-PCR, Western blot, TNFAIP2 siRNA knockdown with intracellular bacterial replication assay","journal":"The Journal of infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq and functional KD with defined phenotype, single lab","pmids":["27130431"],"is_preprint":false},{"year":2017,"finding":"Knockdown of TNFAIP2 in esophageal squamous cell carcinoma cells decreases expression of β-catenin downstream targets (c-Myc, cyclin D1, MMP-7, Snail) and upregulates E-cadherin and p-GSK-3β, placing TNFAIP2 as a positive regulator of the Wnt/β-catenin signaling pathway.","method":"Lentivirus-mediated RNAi knockdown, Western blot, qRT-PCR, cell proliferation/migration/invasion assays","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2–3 — pathway placement by KD with pathway marker readouts, single lab","pmids":["28393234"],"is_preprint":false},{"year":2019,"finding":"TNFAIP2 translation is controlled by upstream open reading frames (uORFs) in its transcript leader sequence that suppress cap-dependent translation in monocytes; during monocyte-to-macrophage differentiation, these uORFs are inactivated, enabling a large increase in TNFAIP2 protein expression.","method":"Reporter assays (uORF mutagenesis), Western blot, polysome profiling, monocyte differentiation model","journal":"Cellular and molecular life sciences","confidence":"High","confidence_rationale":"Tier 1 — reconstituted reporter assays with mutagenesis of uORFs plus differentiation model, single lab with multiple methods","pmids":["31392347"],"is_preprint":false},{"year":2019,"finding":"TNFAIP2 knockdown in platinum-resistant urothelial carcinoma cells upregulates E-cadherin and downregulates TWIST1, reducing motility; TNFAIP2 overexpression has the opposite effect. Global gene expression analysis identified MTDH as a positive regulator of TNFAIP2-driven EMT.","method":"siRNA knockdown, lentiviral overexpression, microarray global gene expression analysis, Western blot, migration/invasion assays","journal":"Laboratory investigation","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional manipulation (KD and OE) plus transcriptomic pathway identification, single lab","pmids":["31263157"],"is_preprint":false},{"year":2020,"finding":"Tnfaip2 acts as an inhibitor of cellular reprogramming and is required for embryonic stem cell (ESC) differentiation; Tnfaip2-deficient ESCs fail to induce triacylglycerol (TAG) synthesis and lipid droplet formation coincident with reduced vimentin expression. Epistasis analysis places Tnfaip2 upstream of vimentin in suppressing reprogramming. Palmitic acid supplementation rescues differentiation defects in Tnfaip2-null ESCs.","method":"Tnfaip2 knockout ESCs, reprogramming assays, lipidomic analysis (TAG/lipid droplets), vimentin expression analysis, genetic epistasis, palmitic acid rescue","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1–2 — genetic KO with epistasis, lipidomic rescue, multiple orthogonal methods in single study","pmids":["33300287"],"is_preprint":false},{"year":2021,"finding":"STAT1 (phosphorylated) binds the enhancer loci of TNFAIP2, recruits the acetyltransferase EP300, and increases H3K27ac enrichment, thereby transcriptionally upregulating TNFAIP2 in the context of inflammatory bowel disease.","method":"ChIP-PCR, co-immunoprecipitation (STAT1–EP300 interaction), RNA-seq, EP300 inhibitor in DSS colitis mouse model","journal":"Clinical epigenetics","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-PCR and co-IP establishing writer (EP300) recruitment by STAT1, with in vivo validation, single lab","pmids":["34112215"],"is_preprint":false},{"year":2022,"finding":"TNFAIP2 is required for tunneling nanotube (TNT) formation in podocytes; in diabetic nephropathy, the TNFAIP2-TNT system allows autophagosome and lysosome exchange between podocytes, alleviating AGE-induced lysosomal dysfunction and apoptosis. Tnfaip2 deletion in mice exacerbates albuminuria, podocyte injury, and autophagic flux blockade.","method":"Tnfaip2 knockout mice (STZ-induced DN model), live-cell imaging of organelle transfer, lysosome/autophagosome functional assays, Tnfaip2 overexpression","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1–2 — in vivo KO with multiple phenotypic readouts, live-cell organelle transfer imaging, overexpression rescue, replicated in vivo and in vitro","pmids":["35659195"],"is_preprint":false},{"year":2023,"finding":"TNFAIP2 contains a DLG motif that directly binds the Kelch domain of KEAP1, competing with NRF2, thereby preventing NRF2 ubiquitin-proteasomal degradation. This leads to NRF2 accumulation, suppression of ROS-mediated JNK phosphorylation, and cisplatin resistance in head and neck squamous cell carcinoma.","method":"Co-immunoprecipitation coupled with mass spectrometry (Co-IP/MS), mutagenesis of DLG motif, Western blot, flow cytometry (ROS, apoptosis), xenograft and 4NQO mouse models, siRNA knockdown","journal":"Journal of experimental & clinical cancer research","confidence":"High","confidence_rationale":"Tier 1–2 — Co-IP/MS identifying direct TNFAIP2–KEAP1 interaction, mutagenesis of binding motif, in vivo validation","pmids":["37525222"],"is_preprint":false},{"year":2023,"finding":"TNFAIP2 interacts with IQGAP1 and Integrin β4 (co-immunoprecipitation); Integrin β4 activates RAC1 through the TNFAIP2–IQGAP1 axis, conferring DNA damage-related drug resistance in triple-negative breast cancer.","method":"Co-immunoprecipitation, RAC1 activity assay, siRNA knockdown, drug resistance assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP identifying a three-component complex with functional epistasis for RAC1 activation and drug resistance","pmids":["37787041"],"is_preprint":false},{"year":2024,"finding":"TNFAIP2 promotes angiogenesis in triple-negative breast cancer by activating a Rac1→ERK→AP-1 (c-Jun/Fra1) signaling cascade; AP-1 directly binds the HIF1α gene promoter to enhance HIF1α transcription, which drives VEGF-dependent angiogenesis.","method":"Chromatin immunoprecipitation (AP-1 binding to HIF1α promoter), luciferase reporter assay, ERK inhibitor (U0126/trametinib) treatment, VEGFR inhibitor (Apatinib), RAC1 activity assay, xenograft mouse model","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP confirming direct AP-1 occupancy on HIF1α promoter, luciferase validation, in vivo model, multiple inhibitors","pmids":["39532855"],"is_preprint":false},{"year":2025,"finding":"TNFAIP2 binds phosphatidylinositol 4,5-bisphosphate (PIP2) and promotes CSF1R aggregate/cluster formation in macrophages via PIP2, RalA, and the exocyst complex, enabling efficient CSF1R dimerization and activation in response to CSF-1. Additionally, TNFAIP2 enhances trafficking of CSF1R to the cell surface through the same PIP2–RalA–exocyst pathway.","method":"Inhibition/knockdown of TNFAIP2, 293-cell reconstitution of CSF1R clustering, PIP2-binding motif mutagenesis, PIP2 depletion, co-immunoprecipitation, CSF1R surface trafficking assay, RalA and exocyst complex functional experiments","journal":"Life science alliance / Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 1–2 — reconstitution in 293 cells, mutagenesis of PIP2-binding site, multiple orthogonal mechanistic experiments across two papers from same lab","pmids":["39939179","41158107"],"is_preprint":false},{"year":2025,"finding":"TGF-β induces acetylation of KLF5, and acetylated KLF5 directly binds the TNFAIP2 promoter to drive TNFAIP2 transcription and EMT in nasopharyngeal carcinoma; the pro-invasive effects of acetylated KLF5 depend on TNFAIP2.","method":"KLF5 acetylation analysis, ChIP assay (KLF5 binding to TNFAIP2 promoter), TNFAIP2 rescue experiments, in vivo NPC mouse model with TGF-β treatment","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP demonstrating direct promoter binding, acetylation modification mapped, functional rescue, single lab","pmids":["40054652"],"is_preprint":false},{"year":2025,"finding":"TNFAIP2 interacts with KEAP1 and prevents IKKβ ubiquitination at K63, protecting IKKβ from proteasomal degradation and sustaining NF-κB signaling to facilitate EMT and lymphangiogenesis in oral squamous cell carcinoma.","method":"Co-immunoprecipitation, conditional Tnfaip2 knockout mouse (4NQO-induced OSCC model), Western blot (ubiquitination), gene set enrichment analysis, siRNA delivery in vivo","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP and conditional KO mouse with K63-ubiquitination mapping, single lab","pmids":["39948570"],"is_preprint":false}],"current_model":"TNFAIP2 is a TNF-α- and NF-κB-inducible cytosolic protein that activates small GTPases Rac1 and Cdc42 (partly through an Integrin β4–IQGAP1 scaffold), promotes actin remodeling, cell migration, and tumor invasion; stabilizes NRF2 and IKKβ by competing with KEAP1 for substrate binding; binds PIP2 to drive CSF1R clustering and surface trafficking via RalA and the exocyst complex in macrophages; mediates tunneling nanotube formation enabling intercellular organelle transfer; drives HIF1α transcription through a Rac1–ERK–AP-1 axis; and is itself transcriptionally regulated by NF-κB, KLF5 (acetylated by TGF-β), STAT1–EP300–H3K27ac, and PML-RARα/retinoic acid, while its translation is controlled by inhibitory upstream open reading frames that are relieved during macrophage differentiation."},"narrative":{"teleology":[{"year":1994,"claim":"Identifying TNFAIP2 as a TNF-α primary response gene with tissue-restricted isoforms established a new TNF-inducible effector with potential roles in hematopoiesis and spermatogenesis.","evidence":"In situ hybridization, Northern blot, and immunostaining in mouse tissues","pmids":["8106408"],"confidence":"Medium","gaps":["No functional assay to link expression to a cellular process","Acrosomal function of truncated isoform unknown"]},{"year":2000,"claim":"Demonstrating that PML-RARα directly activates TNFAIP2 transcription upon retinoic acid treatment placed the gene within the differentiation program of acute promyelocytic leukemia cells.","evidence":"Microarray, RT-PCR, actinomycin D and cycloheximide inhibition in TF1-PR cells","pmids":["10766166"],"confidence":"Medium","gaps":["No downstream effector pathway identified","Role of PML coiled-coil domain in transcriptional activation not mechanistically resolved"]},{"year":2013,"claim":"Mapping the NF-κB binding site on the TNFAIP2 promoter and showing TNFAIP2 co-immunoprecipitates with actin and promotes membrane protrusions resolved how NF-κB signaling connects to cytoskeletal remodeling and cell motility.","evidence":"Luciferase reporter, p65 siRNA, co-IP, immunofluorescence, transwell migration in NPC cells","pmids":["23975427"],"confidence":"High","gaps":["Direct actin-binding domain not mapped","Whether TNFAIP2 nucleates or bundles actin filaments unknown"]},{"year":2015,"claim":"Identifying TNFAIP2 as a direct KLF5 target and showing it activates Rac1 and Cdc42 GTPases revealed the core molecular mechanism by which TNFAIP2 remodels the cytoskeleton and promotes invasion.","evidence":"ChIP, co-IP, Rac1/Cdc42 pull-down activity assays, siRNA rescue in breast cancer cells","pmids":["26189798"],"confidence":"High","gaps":["Whether TNFAIP2 acts as a GEF, GEF scaffold, or GDI competitor not determined","Structural basis of Rac1/Cdc42 interaction unknown"]},{"year":2015,"claim":"Showing TNFAIP2 inhibits NF-κB activity and IL-8 production revealed a negative feedback loop in the TNFα response, with a clinical genetic correlate in septic shock.","evidence":"NF-κB reporter assay, IL-8 measurement, rs8126 genetic association","pmids":["26347487"],"confidence":"Medium","gaps":["Mechanism of NF-κB inhibition not defined at this stage","Genetic association not replicated in independent cohort"]},{"year":2019,"claim":"Discovering that inhibitory upstream open reading frames suppress TNFAIP2 translation in monocytes and are relieved during macrophage differentiation established a post-transcriptional gate controlling TNFAIP2 protein levels.","evidence":"uORF mutagenesis reporter assays, polysome profiling, monocyte differentiation model","pmids":["31392347"],"confidence":"High","gaps":["Trans-acting factors that inactivate the uORFs unidentified","Whether eIF2α phosphorylation or specific initiation factor changes mediate uORF bypass unknown"]},{"year":2020,"claim":"Genetic ablation of Tnfaip2 in embryonic stem cells revealed an unexpected requirement for TAG/lipid droplet synthesis and vimentin expression during differentiation, broadening the gene's role beyond cytoskeletal regulation to lipid metabolism.","evidence":"Tnfaip2 KO ESCs, lipidomic analysis, vimentin epistasis, palmitic acid rescue","pmids":["33300287"],"confidence":"High","gaps":["Direct enzyme or transporter through which TNFAIP2 controls TAG synthesis unknown","Whether lipid effects are Rac1/Cdc42-dependent not tested"]},{"year":2021,"claim":"Showing that phospho-STAT1 recruits EP300 to deposit H3K27ac at TNFAIP2 enhancers added an interferon/inflammatory transcriptional axis to the gene's regulatory inputs.","evidence":"ChIP-PCR, STAT1–EP300 co-IP, EP300 inhibitor in DSS colitis mouse model","pmids":["34112215"],"confidence":"Medium","gaps":["Whether STAT1-driven induction is independent of NF-κB co-activation not formally dissected","Enhancer–promoter contact not confirmed by 3C/4C"]},{"year":2022,"claim":"Demonstrating that TNFAIP2 drives tunneling nanotube formation enabling autophagosome and lysosome transfer between podocytes established a novel intercellular organelle exchange mechanism with in vivo relevance in diabetic nephropathy.","evidence":"Tnfaip2 KO mice with STZ-induced DN, live-cell imaging of organelle transfer, autophagic flux assays","pmids":["35659195"],"confidence":"High","gaps":["Molecular mechanism connecting TNFAIP2 to TNT biogenesis not defined","Whether Rac1/Cdc42 activation is required for TNT formation not tested"]},{"year":2023,"claim":"Identifying a DLG motif in TNFAIP2 that directly binds the KEAP1 Kelch domain, displacing NRF2 from ubiquitination, provided a structural mechanism for TNFAIP2-mediated antioxidant defense and cisplatin resistance.","evidence":"Co-IP/MS, DLG motif mutagenesis, ROS measurement, xenograft and 4NQO mouse models","pmids":["37525222"],"confidence":"High","gaps":["Binding affinity relative to NRF2 ETGE/DLG motifs not quantified","Crystal structure of TNFAIP2-KEAP1 complex unavailable"]},{"year":2023,"claim":"Revealing that Integrin β4 activates Rac1 through a TNFAIP2–IQGAP1 scaffolding complex explained how extracellular matrix signals converge on TNFAIP2-dependent GTPase signaling to confer drug resistance.","evidence":"Reciprocal co-IP, Rac1 activity assay, siRNA epistasis in triple-negative breast cancer cells","pmids":["37787041"],"confidence":"High","gaps":["Stoichiometry and direct vs. indirect TNFAIP2–IQGAP1 interaction not resolved","Whether this complex is constitutive or signaling-induced not determined"]},{"year":2024,"claim":"Mapping a Rac1→ERK→AP-1 cascade downstream of TNFAIP2 that transcriptionally activates HIF1α connected cytoskeletal GTPase signaling to angiogenesis in triple-negative breast cancer.","evidence":"ChIP (AP-1 on HIF1α promoter), luciferase reporter, ERK/VEGFR inhibitors, xenograft model","pmids":["39532855"],"confidence":"High","gaps":["Whether TNFAIP2-driven HIF1α induction operates under normoxia vs. hypoxia not fully dissected","Contribution of Cdc42 vs. Rac1 to this axis not separated"]},{"year":2025,"claim":"Demonstrating that TNFAIP2 binds PIP2 and engages RalA and the exocyst complex to cluster and traffic CSF1R to the macrophage surface established TNFAIP2 as a lipid-binding organizer of receptor signaling platforms.","evidence":"PIP2-binding motif mutagenesis, PIP2 depletion, CSF1R clustering reconstitution in 293 cells, RalA and exocyst co-IP","pmids":["39939179","41158107"],"confidence":"High","gaps":["Whether PIP2 binding is required for all TNFAIP2 functions (e.g., TNT formation, GTPase activation) not tested","Structural basis of PIP2 recognition undefined"]},{"year":2025,"claim":"Showing that TNFAIP2 competes with IKKβ for KEAP1 binding to prevent K63-linked ubiquitination and degradation of IKKβ unified the KEAP1-competition mechanism with sustained NF-κB signaling.","evidence":"Co-IP, ubiquitination assay, conditional Tnfaip2 KO in 4NQO-induced OSCC mouse model","pmids":["39948570"],"confidence":"Medium","gaps":["Whether KEAP1 binds IKKβ and NRF2 at the same site or distinct sites when TNFAIP2 is present not resolved","Relative contribution of NRF2 stabilization vs. IKKβ stabilization to tumor phenotypes not separated"]},{"year":null,"claim":"Key unresolved questions include the precise biochemical activity of TNFAIP2 toward Rac1/Cdc42 (GEF, scaffold, or GDI-displacement factor), the structural basis of its interactions with KEAP1, PIP2, and GTPases, and how the diverse effector outputs (cytoskeletal remodeling, TNT formation, lipid metabolism, receptor clustering) are coordinated or context-selected.","evidence":"","pmids":[],"confidence":"Low","gaps":["No in vitro reconstitution of GEF or GEF-scaffold activity","No high-resolution structure of TNFAIP2 or its complexes","Context-specific regulation determining which effector pathway dominates is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,13,14,18]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[16]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[3,4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[14,16]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,4,16]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,16]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,5,7,15,16,18]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[13,18]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[12]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[10]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,11,17]}],"complexes":[],"partners":["RAC1","CDC42","KEAP1","IQGAP1","ITGB4","RALA","ACTIN","CSF1R"],"other_free_text":[]},"mechanistic_narrative":"TNFAIP2 is a TNF-α- and NF-κB-inducible cytosolic protein that orchestrates actin remodeling, cell migration, membrane receptor trafficking, and intercellular communication by activating the small GTPases Rac1 and Cdc42. It directly binds Rac1/Cdc42 (partly through an Integrin β4–IQGAP1 scaffold) to drive actin-based protrusions, epithelial–mesenchymal transition, and tumor invasion, and signals through a Rac1→ERK→AP-1 axis to transcriptionally activate HIF1α and VEGF-dependent angiogenesis [PMID:26189798, PMID:37787041, PMID:39532855]. TNFAIP2 also binds PIP2 and engages RalA and the exocyst complex to promote CSF1R clustering and surface trafficking in macrophages, mediates tunneling nanotube formation enabling intercellular organelle transfer in podocytes, and competes with NRF2 and IKKβ for KEAP1 binding via its DLG motif, thereby stabilizing both proteins and modulating oxidative-stress and NF-κB signaling [PMID:39939179, PMID:35659195, PMID:37525222, PMID:39948570]. Its transcription is driven by NF-κB, STAT1–EP300, KLF5 (acetylated by TGF-β signaling), and PML-RARα/retinoic acid, while its translation is controlled by inhibitory upstream open reading frames that are relieved during monocyte-to-macrophage differentiation [PMID:23975427, PMID:34112215, PMID:40054652, PMID:31392347]."},"prefetch_data":{"uniprot":{"accession":"Q03169","full_name":"Tumor necrosis factor alpha-induced protein 2","aliases":["Primary response gene B94 protein"],"length_aa":654,"mass_kda":72.7,"function":"May play a role as a mediator of inflammation and angiogenesis","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q03169/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TNFAIP2","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/TNFAIP2","total_profiled":1310},"omim":[{"mim_id":"603300","title":"TUMOR NECROSIS FACTOR-ALPHA-INDUCED PROTEIN 2; TNFAIP2","url":"https://www.omim.org/entry/603300"},{"mim_id":"191163","title":"TUMOR NECROSIS FACTOR-ALPHA-INDUCED PROTEIN 3; TNFAIP3","url":"https://www.omim.org/entry/191163"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Nuclear membrane","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"urinary bladder","ntpm":258.7}],"url":"https://www.proteinatlas.org/search/TNFAIP2"},"hgnc":{"alias_symbol":["B94","EXOC3L3"],"prev_symbol":[]},"alphafold":{"accession":"Q03169","domains":[{"cath_id":"-","chopping":"80-170","consensus_level":"medium","plddt":90.9793,"start":80,"end":170},{"cath_id":"-","chopping":"193-309","consensus_level":"medium","plddt":90.1509,"start":193,"end":309},{"cath_id":"1.10.357,1.10.357","chopping":"315-461","consensus_level":"high","plddt":94.6122,"start":315,"end":461},{"cath_id":"1.10.357.70","chopping":"485-651","consensus_level":"high","plddt":92.1243,"start":485,"end":651}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q03169","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q03169-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q03169-F1-predicted_aligned_error_v6.png","plddt_mean":85.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TNFAIP2","jax_strain_url":"https://www.jax.org/strain/search?query=TNFAIP2"},"sequence":{"accession":"Q03169","fasta_url":"https://rest.uniprot.org/uniprotkb/Q03169.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q03169/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q03169"}},"corpus_meta":[{"pmid":"26189798","id":"PMC_26189798","title":"KLF5 promotes breast cancer proliferation, migration and invasion in part by upregulating the transcription of TNFAIP2.","date":"2015","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/26189798","citation_count":128,"is_preprint":false},{"pmid":"30145807","id":"PMC_30145807","title":"The roles of TNFAIP2 in cancers and infectious diseases.","date":"2018","source":"Journal of cellular and molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30145807","citation_count":79,"is_preprint":false},{"pmid":"35659195","id":"PMC_35659195","title":"Protective effect of the tunneling nanotube-TNFAIP2/M-sec system on podocyte autophagy in diabetic nephropathy.","date":"2022","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/35659195","citation_count":78,"is_preprint":false},{"pmid":"25888093","id":"PMC_25888093","title":"MicroRNA-184 inhibits cell proliferation and invasion, and specifically targets TNFAIP2 in Glioma.","date":"2015","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/25888093","citation_count":68,"is_preprint":false},{"pmid":"10766166","id":"PMC_10766166","title":"Identification of B94 (TNFAIP2) as a potential retinoic acid target gene in acute promyelocytic leukemia.","date":"2000","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/10766166","citation_count":65,"is_preprint":false},{"pmid":"21934093","id":"PMC_21934093","title":"A functional variant at the miR-184 binding site in TNFAIP2 and risk of squamous cell carcinoma of the head and neck.","date":"2011","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/21934093","citation_count":64,"is_preprint":false},{"pmid":"8106408","id":"PMC_8106408","title":"B94, a primary response gene inducible by tumor necrosis factor-alpha, is expressed in developing hematopoietic tissues and the sperm acrosome.","date":"1994","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8106408","citation_count":62,"is_preprint":false},{"pmid":"23975427","id":"PMC_23975427","title":"NF-κB-mediated transcriptional upregulation of TNFAIP2 by the Epstein-Barr virus oncoprotein, LMP1, promotes cell motility in nasopharyngeal carcinoma.","date":"2013","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/23975427","citation_count":62,"is_preprint":false},{"pmid":"21057457","id":"PMC_21057457","title":"A novel role for TNFAIP2: its correlation with invasion and metastasis in nasopharyngeal carcinoma.","date":"2010","source":"Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc","url":"https://pubmed.ncbi.nlm.nih.gov/21057457","citation_count":50,"is_preprint":false},{"pmid":"37525222","id":"PMC_37525222","title":"TNFAIP2 confers cisplatin resistance in head and neck squamous cell carcinoma via KEAP1/NRF2 signaling.","date":"2023","source":"Journal of experimental & clinical 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(Ctenopharyngodon idella).","date":"2021","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/34262558","citation_count":12,"is_preprint":false},{"pmid":"39532855","id":"PMC_39532855","title":"TNFAIP2 promotes HIF1α transcription and breast cancer angiogenesis by activating the Rac1-ERK-AP1 signaling axis.","date":"2024","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/39532855","citation_count":11,"is_preprint":false},{"pmid":"31392347","id":"PMC_31392347","title":"Translation of TNFAIP2 is tightly controlled by upstream open reading frames.","date":"2019","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/31392347","citation_count":10,"is_preprint":false},{"pmid":"39948570","id":"PMC_39948570","title":"TNFAIP2 promotes NF-κB signaling mediate lymph node metastasis of oral squamous cell carcinoma by protecting IKKβ from ubiquitin proteasome degradation.","date":"2025","source":"Cell communication 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Immunostaining localized B94 protein to the acrosomal compartment of mature sperm.\",\n      \"method\": \"In situ hybridization, Northern blot, affinity-purified polyclonal antiserum immunostaining, mouse chromosomal mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by immunostaining and expression mapping with functional context, single lab\",\n      \"pmids\": [\"8106408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TNFAIP2 (B94) is a retinoic acid target gene in acute promyelocytic leukemia cells expressing PML-RARα; induction is rapid (within 1 h), does not require new protein synthesis, is blocked by actinomycin D, and is dependent on the PML coiled-coil domain of PML-RARα, indicating direct transcriptional activation.\",\n      \"method\": \"cDNA microarray, quantitative RT-PCR, actinomycin D and cycloheximide inhibition assays in TF1-PR cells\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple inhibitor experiments establishing transcriptional mechanism, single lab\",\n      \"pmids\": [\"10766166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Knockdown of TNFAIP2 by siRNA dramatically reduces migration and invasion of nasopharyngeal carcinoma HK1 cells, establishing a direct role for TNFAIP2 in promoting cell motility.\",\n      \"method\": \"siRNA knockdown, transwell migration and invasion assays\",\n      \"journal\": \"Modern pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype, single lab\",\n      \"pmids\": [\"21057457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The EBV oncoprotein LMP1 transcriptionally induces TNFAIP2 expression through its CTAR2 domain via NF-κB; a specific NF-κB binding site was identified at −3,869 to −3,860 bp of the TNFAIP2 promoter. TNFAIP2 associates with actin (co-immunoprecipitation), participates in actin-based membrane protrusion formation, and promotes LMP1-induced cell motility.\",\n      \"method\": \"Quantitative RT-PCR, Western blot, luciferase reporter assay, NF-κB inhibition, p65 siRNA knockdown, co-immunoprecipitation, immunofluorescence microscopy, transwell migration assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including promoter mapping, co-IP, and functional migration assay in single study\",\n      \"pmids\": [\"23975427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KLF5 directly binds the TNFAIP2 gene promoter and activates its transcription; TNFAIP2 in turn interacts with the small GTPases Rac1 and Cdc42, increasing their activities to alter the actin cytoskeleton and cell morphology, thereby promoting breast cancer cell proliferation, migration, and invasion.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, co-immunoprecipitation, GTPase activity assays (Rac1/Cdc42 pull-down), siRNA knockdown, cell migration/invasion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP, co-IP, GTPase activity assay, and functional rescue experiments with multiple orthogonal methods\",\n      \"pmids\": [\"26189798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TNFAIP2 inhibits NF-κB activity and downstream IL-8 production, acting as an autoinhibitor of the early TNFα response. A genetic variant (rs8126) that increases TNFAIP2 expression correlates with decreased IL-8 and worse survival in septic shock patients.\",\n      \"method\": \"In vitro microarray gene expression, NF-κB reporter assay, cytokine measurement (IL-8), genetic association study\",\n      \"journal\": \"Journal of innate immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — NF-κB reporter assay combined with genetic variant data, single lab\",\n      \"pmids\": [\"26347487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TNFAIP2 expression is induced by Legionella pneumophila infection in macrophages via NF-κB-dependent transcription (histone H4 acetylation at the TNFAIP2 promoter detected by ChIP-seq); knockdown of TNFAIP2 reduces intracellular L. pneumophila replication, indicating a pro-bacterial role.\",\n      \"method\": \"ChIP-seq (H4 acetylation), qRT-PCR, Western blot, TNFAIP2 siRNA knockdown with intracellular bacterial replication assay\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq and functional KD with defined phenotype, single lab\",\n      \"pmids\": [\"27130431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Knockdown of TNFAIP2 in esophageal squamous cell carcinoma cells decreases expression of β-catenin downstream targets (c-Myc, cyclin D1, MMP-7, Snail) and upregulates E-cadherin and p-GSK-3β, placing TNFAIP2 as a positive regulator of the Wnt/β-catenin signaling pathway.\",\n      \"method\": \"Lentivirus-mediated RNAi knockdown, Western blot, qRT-PCR, cell proliferation/migration/invasion assays\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — pathway placement by KD with pathway marker readouts, single lab\",\n      \"pmids\": [\"28393234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TNFAIP2 translation is controlled by upstream open reading frames (uORFs) in its transcript leader sequence that suppress cap-dependent translation in monocytes; during monocyte-to-macrophage differentiation, these uORFs are inactivated, enabling a large increase in TNFAIP2 protein expression.\",\n      \"method\": \"Reporter assays (uORF mutagenesis), Western blot, polysome profiling, monocyte differentiation model\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted reporter assays with mutagenesis of uORFs plus differentiation model, single lab with multiple methods\",\n      \"pmids\": [\"31392347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TNFAIP2 knockdown in platinum-resistant urothelial carcinoma cells upregulates E-cadherin and downregulates TWIST1, reducing motility; TNFAIP2 overexpression has the opposite effect. Global gene expression analysis identified MTDH as a positive regulator of TNFAIP2-driven EMT.\",\n      \"method\": \"siRNA knockdown, lentiviral overexpression, microarray global gene expression analysis, Western blot, migration/invasion assays\",\n      \"journal\": \"Laboratory investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation (KD and OE) plus transcriptomic pathway identification, single lab\",\n      \"pmids\": [\"31263157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Tnfaip2 acts as an inhibitor of cellular reprogramming and is required for embryonic stem cell (ESC) differentiation; Tnfaip2-deficient ESCs fail to induce triacylglycerol (TAG) synthesis and lipid droplet formation coincident with reduced vimentin expression. Epistasis analysis places Tnfaip2 upstream of vimentin in suppressing reprogramming. Palmitic acid supplementation rescues differentiation defects in Tnfaip2-null ESCs.\",\n      \"method\": \"Tnfaip2 knockout ESCs, reprogramming assays, lipidomic analysis (TAG/lipid droplets), vimentin expression analysis, genetic epistasis, palmitic acid rescue\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic KO with epistasis, lipidomic rescue, multiple orthogonal methods in single study\",\n      \"pmids\": [\"33300287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STAT1 (phosphorylated) binds the enhancer loci of TNFAIP2, recruits the acetyltransferase EP300, and increases H3K27ac enrichment, thereby transcriptionally upregulating TNFAIP2 in the context of inflammatory bowel disease.\",\n      \"method\": \"ChIP-PCR, co-immunoprecipitation (STAT1–EP300 interaction), RNA-seq, EP300 inhibitor in DSS colitis mouse model\",\n      \"journal\": \"Clinical epigenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-PCR and co-IP establishing writer (EP300) recruitment by STAT1, with in vivo validation, single lab\",\n      \"pmids\": [\"34112215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TNFAIP2 is required for tunneling nanotube (TNT) formation in podocytes; in diabetic nephropathy, the TNFAIP2-TNT system allows autophagosome and lysosome exchange between podocytes, alleviating AGE-induced lysosomal dysfunction and apoptosis. Tnfaip2 deletion in mice exacerbates albuminuria, podocyte injury, and autophagic flux blockade.\",\n      \"method\": \"Tnfaip2 knockout mice (STZ-induced DN model), live-cell imaging of organelle transfer, lysosome/autophagosome functional assays, Tnfaip2 overexpression\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vivo KO with multiple phenotypic readouts, live-cell organelle transfer imaging, overexpression rescue, replicated in vivo and in vitro\",\n      \"pmids\": [\"35659195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TNFAIP2 contains a DLG motif that directly binds the Kelch domain of KEAP1, competing with NRF2, thereby preventing NRF2 ubiquitin-proteasomal degradation. This leads to NRF2 accumulation, suppression of ROS-mediated JNK phosphorylation, and cisplatin resistance in head and neck squamous cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation coupled with mass spectrometry (Co-IP/MS), mutagenesis of DLG motif, Western blot, flow cytometry (ROS, apoptosis), xenograft and 4NQO mouse models, siRNA knockdown\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — Co-IP/MS identifying direct TNFAIP2–KEAP1 interaction, mutagenesis of binding motif, in vivo validation\",\n      \"pmids\": [\"37525222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TNFAIP2 interacts with IQGAP1 and Integrin β4 (co-immunoprecipitation); Integrin β4 activates RAC1 through the TNFAIP2–IQGAP1 axis, conferring DNA damage-related drug resistance in triple-negative breast cancer.\",\n      \"method\": \"Co-immunoprecipitation, RAC1 activity assay, siRNA knockdown, drug resistance assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP identifying a three-component complex with functional epistasis for RAC1 activation and drug resistance\",\n      \"pmids\": [\"37787041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TNFAIP2 promotes angiogenesis in triple-negative breast cancer by activating a Rac1→ERK→AP-1 (c-Jun/Fra1) signaling cascade; AP-1 directly binds the HIF1α gene promoter to enhance HIF1α transcription, which drives VEGF-dependent angiogenesis.\",\n      \"method\": \"Chromatin immunoprecipitation (AP-1 binding to HIF1α promoter), luciferase reporter assay, ERK inhibitor (U0126/trametinib) treatment, VEGFR inhibitor (Apatinib), RAC1 activity assay, xenograft mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP confirming direct AP-1 occupancy on HIF1α promoter, luciferase validation, in vivo model, multiple inhibitors\",\n      \"pmids\": [\"39532855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TNFAIP2 binds phosphatidylinositol 4,5-bisphosphate (PIP2) and promotes CSF1R aggregate/cluster formation in macrophages via PIP2, RalA, and the exocyst complex, enabling efficient CSF1R dimerization and activation in response to CSF-1. Additionally, TNFAIP2 enhances trafficking of CSF1R to the cell surface through the same PIP2–RalA–exocyst pathway.\",\n      \"method\": \"Inhibition/knockdown of TNFAIP2, 293-cell reconstitution of CSF1R clustering, PIP2-binding motif mutagenesis, PIP2 depletion, co-immunoprecipitation, CSF1R surface trafficking assay, RalA and exocyst complex functional experiments\",\n      \"journal\": \"Life science alliance / Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution in 293 cells, mutagenesis of PIP2-binding site, multiple orthogonal mechanistic experiments across two papers from same lab\",\n      \"pmids\": [\"39939179\", \"41158107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TGF-β induces acetylation of KLF5, and acetylated KLF5 directly binds the TNFAIP2 promoter to drive TNFAIP2 transcription and EMT in nasopharyngeal carcinoma; the pro-invasive effects of acetylated KLF5 depend on TNFAIP2.\",\n      \"method\": \"KLF5 acetylation analysis, ChIP assay (KLF5 binding to TNFAIP2 promoter), TNFAIP2 rescue experiments, in vivo NPC mouse model with TGF-β treatment\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating direct promoter binding, acetylation modification mapped, functional rescue, single lab\",\n      \"pmids\": [\"40054652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TNFAIP2 interacts with KEAP1 and prevents IKKβ ubiquitination at K63, protecting IKKβ from proteasomal degradation and sustaining NF-κB signaling to facilitate EMT and lymphangiogenesis in oral squamous cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, conditional Tnfaip2 knockout mouse (4NQO-induced OSCC model), Western blot (ubiquitination), gene set enrichment analysis, siRNA delivery in vivo\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP and conditional KO mouse with K63-ubiquitination mapping, single lab\",\n      \"pmids\": [\"39948570\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TNFAIP2 is a TNF-α- and NF-κB-inducible cytosolic protein that activates small GTPases Rac1 and Cdc42 (partly through an Integrin β4–IQGAP1 scaffold), promotes actin remodeling, cell migration, and tumor invasion; stabilizes NRF2 and IKKβ by competing with KEAP1 for substrate binding; binds PIP2 to drive CSF1R clustering and surface trafficking via RalA and the exocyst complex in macrophages; mediates tunneling nanotube formation enabling intercellular organelle transfer; drives HIF1α transcription through a Rac1–ERK–AP-1 axis; and is itself transcriptionally regulated by NF-κB, KLF5 (acetylated by TGF-β), STAT1–EP300–H3K27ac, and PML-RARα/retinoic acid, while its translation is controlled by inhibitory upstream open reading frames that are relieved during macrophage differentiation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TNFAIP2 is a TNF-α- and NF-κB-inducible cytosolic protein that orchestrates actin remodeling, cell migration, membrane receptor trafficking, and intercellular communication by activating the small GTPases Rac1 and Cdc42. It directly binds Rac1/Cdc42 (partly through an Integrin β4–IQGAP1 scaffold) to drive actin-based protrusions, epithelial–mesenchymal transition, and tumor invasion, and signals through a Rac1→ERK→AP-1 axis to transcriptionally activate HIF1α and VEGF-dependent angiogenesis [PMID:26189798, PMID:37787041, PMID:39532855]. TNFAIP2 also binds PIP2 and engages RalA and the exocyst complex to promote CSF1R clustering and surface trafficking in macrophages, mediates tunneling nanotube formation enabling intercellular organelle transfer in podocytes, and competes with NRF2 and IKKβ for KEAP1 binding via its DLG motif, thereby stabilizing both proteins and modulating oxidative-stress and NF-κB signaling [PMID:39939179, PMID:35659195, PMID:37525222, PMID:39948570]. Its transcription is driven by NF-κB, STAT1–EP300, KLF5 (acetylated by TGF-β signaling), and PML-RARα/retinoic acid, while its translation is controlled by inhibitory upstream open reading frames that are relieved during monocyte-to-macrophage differentiation [PMID:23975427, PMID:34112215, PMID:40054652, PMID:31392347].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Identifying TNFAIP2 as a TNF-α primary response gene with tissue-restricted isoforms established a new TNF-inducible effector with potential roles in hematopoiesis and spermatogenesis.\",\n      \"evidence\": \"In situ hybridization, Northern blot, and immunostaining in mouse tissues\",\n      \"pmids\": [\"8106408\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional assay to link expression to a cellular process\", \"Acrosomal function of truncated isoform unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrating that PML-RARα directly activates TNFAIP2 transcription upon retinoic acid treatment placed the gene within the differentiation program of acute promyelocytic leukemia cells.\",\n      \"evidence\": \"Microarray, RT-PCR, actinomycin D and cycloheximide inhibition in TF1-PR cells\",\n      \"pmids\": [\"10766166\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No downstream effector pathway identified\", \"Role of PML coiled-coil domain in transcriptional activation not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapping the NF-κB binding site on the TNFAIP2 promoter and showing TNFAIP2 co-immunoprecipitates with actin and promotes membrane protrusions resolved how NF-κB signaling connects to cytoskeletal remodeling and cell motility.\",\n      \"evidence\": \"Luciferase reporter, p65 siRNA, co-IP, immunofluorescence, transwell migration in NPC cells\",\n      \"pmids\": [\"23975427\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct actin-binding domain not mapped\", \"Whether TNFAIP2 nucleates or bundles actin filaments unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying TNFAIP2 as a direct KLF5 target and showing it activates Rac1 and Cdc42 GTPases revealed the core molecular mechanism by which TNFAIP2 remodels the cytoskeleton and promotes invasion.\",\n      \"evidence\": \"ChIP, co-IP, Rac1/Cdc42 pull-down activity assays, siRNA rescue in breast cancer cells\",\n      \"pmids\": [\"26189798\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TNFAIP2 acts as a GEF, GEF scaffold, or GDI competitor not determined\", \"Structural basis of Rac1/Cdc42 interaction unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showing TNFAIP2 inhibits NF-κB activity and IL-8 production revealed a negative feedback loop in the TNFα response, with a clinical genetic correlate in septic shock.\",\n      \"evidence\": \"NF-κB reporter assay, IL-8 measurement, rs8126 genetic association\",\n      \"pmids\": [\"26347487\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of NF-κB inhibition not defined at this stage\", \"Genetic association not replicated in independent cohort\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovering that inhibitory upstream open reading frames suppress TNFAIP2 translation in monocytes and are relieved during macrophage differentiation established a post-transcriptional gate controlling TNFAIP2 protein levels.\",\n      \"evidence\": \"uORF mutagenesis reporter assays, polysome profiling, monocyte differentiation model\",\n      \"pmids\": [\"31392347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trans-acting factors that inactivate the uORFs unidentified\", \"Whether eIF2α phosphorylation or specific initiation factor changes mediate uORF bypass unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genetic ablation of Tnfaip2 in embryonic stem cells revealed an unexpected requirement for TAG/lipid droplet synthesis and vimentin expression during differentiation, broadening the gene's role beyond cytoskeletal regulation to lipid metabolism.\",\n      \"evidence\": \"Tnfaip2 KO ESCs, lipidomic analysis, vimentin epistasis, palmitic acid rescue\",\n      \"pmids\": [\"33300287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct enzyme or transporter through which TNFAIP2 controls TAG synthesis unknown\", \"Whether lipid effects are Rac1/Cdc42-dependent not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showing that phospho-STAT1 recruits EP300 to deposit H3K27ac at TNFAIP2 enhancers added an interferon/inflammatory transcriptional axis to the gene's regulatory inputs.\",\n      \"evidence\": \"ChIP-PCR, STAT1–EP300 co-IP, EP300 inhibitor in DSS colitis mouse model\",\n      \"pmids\": [\"34112215\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether STAT1-driven induction is independent of NF-κB co-activation not formally dissected\", \"Enhancer–promoter contact not confirmed by 3C/4C\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that TNFAIP2 drives tunneling nanotube formation enabling autophagosome and lysosome transfer between podocytes established a novel intercellular organelle exchange mechanism with in vivo relevance in diabetic nephropathy.\",\n      \"evidence\": \"Tnfaip2 KO mice with STZ-induced DN, live-cell imaging of organelle transfer, autophagic flux assays\",\n      \"pmids\": [\"35659195\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism connecting TNFAIP2 to TNT biogenesis not defined\", \"Whether Rac1/Cdc42 activation is required for TNT formation not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identifying a DLG motif in TNFAIP2 that directly binds the KEAP1 Kelch domain, displacing NRF2 from ubiquitination, provided a structural mechanism for TNFAIP2-mediated antioxidant defense and cisplatin resistance.\",\n      \"evidence\": \"Co-IP/MS, DLG motif mutagenesis, ROS measurement, xenograft and 4NQO mouse models\",\n      \"pmids\": [\"37525222\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding affinity relative to NRF2 ETGE/DLG motifs not quantified\", \"Crystal structure of TNFAIP2-KEAP1 complex unavailable\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealing that Integrin β4 activates Rac1 through a TNFAIP2–IQGAP1 scaffolding complex explained how extracellular matrix signals converge on TNFAIP2-dependent GTPase signaling to confer drug resistance.\",\n      \"evidence\": \"Reciprocal co-IP, Rac1 activity assay, siRNA epistasis in triple-negative breast cancer cells\",\n      \"pmids\": [\"37787041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and direct vs. indirect TNFAIP2–IQGAP1 interaction not resolved\", \"Whether this complex is constitutive or signaling-induced not determined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapping a Rac1→ERK→AP-1 cascade downstream of TNFAIP2 that transcriptionally activates HIF1α connected cytoskeletal GTPase signaling to angiogenesis in triple-negative breast cancer.\",\n      \"evidence\": \"ChIP (AP-1 on HIF1α promoter), luciferase reporter, ERK/VEGFR inhibitors, xenograft model\",\n      \"pmids\": [\"39532855\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TNFAIP2-driven HIF1α induction operates under normoxia vs. hypoxia not fully dissected\", \"Contribution of Cdc42 vs. Rac1 to this axis not separated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating that TNFAIP2 binds PIP2 and engages RalA and the exocyst complex to cluster and traffic CSF1R to the macrophage surface established TNFAIP2 as a lipid-binding organizer of receptor signaling platforms.\",\n      \"evidence\": \"PIP2-binding motif mutagenesis, PIP2 depletion, CSF1R clustering reconstitution in 293 cells, RalA and exocyst co-IP\",\n      \"pmids\": [\"39939179\", \"41158107\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PIP2 binding is required for all TNFAIP2 functions (e.g., TNT formation, GTPase activation) not tested\", \"Structural basis of PIP2 recognition undefined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showing that TNFAIP2 competes with IKKβ for KEAP1 binding to prevent K63-linked ubiquitination and degradation of IKKβ unified the KEAP1-competition mechanism with sustained NF-κB signaling.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, conditional Tnfaip2 KO in 4NQO-induced OSCC mouse model\",\n      \"pmids\": [\"39948570\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether KEAP1 binds IKKβ and NRF2 at the same site or distinct sites when TNFAIP2 is present not resolved\", \"Relative contribution of NRF2 stabilization vs. IKKβ stabilization to tumor phenotypes not separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the precise biochemical activity of TNFAIP2 toward Rac1/Cdc42 (GEF, scaffold, or GDI-displacement factor), the structural basis of its interactions with KEAP1, PIP2, and GTPases, and how the diverse effector outputs (cytoskeletal remodeling, TNT formation, lipid metabolism, receptor clustering) are coordinated or context-selected.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No in vitro reconstitution of GEF or GEF-scaffold activity\", \"No high-resolution structure of TNFAIP2 or its complexes\", \"Context-specific regulation determining which effector pathway dominates is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 13, 14, 18]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [14, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 4, 16]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 5, 7, 15, 16, 18]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [13, 18]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 11, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"RAC1\",\n      \"CDC42\",\n      \"KEAP1\",\n      \"IQGAP1\",\n      \"ITGB4\",\n      \"RALA\",\n      \"ACTIN\",\n      \"CSF1R\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}