{"gene":"NAB2","run_date":"2026-04-29T11:37:56","timeline":{"discoveries":[{"year":1996,"finding":"NAB2 functions as a transcriptional corepressor that directly interacts with the R1 domain of NGFI-A (Egr-1) and Krox20, repressing their transcriptional activation activity. The first conserved domain (NCD1) of NAB2 mediates this interaction.","method":"Protein interaction mapping, transcriptional repression assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — original discovery with direct binding domain mapping and functional repression assays, replicated across multiple subsequent studies","pmids":["8668170"],"is_preprint":false},{"year":2006,"finding":"NAB2 represses transcription via at least two repression domains, one of which requires interaction with CHD4, a subunit of the NuRD (nucleosome remodeling and deacetylase) chromatin remodeling complex. Both NAB1 and NAB2 bind CHD3 or CHD4. NAB2 and CHD4 co-occupy the Rad gene promoter in myelinating Schwann cells, and interaction with CHD4 is regulated by alternative splicing of NAB2 mRNA.","method":"Co-immunoprecipitation, chromatin immunoprecipitation, transcriptional repression assays, alternative splicing analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ChIP at endogenous locus, and functional repression assays in a single study","pmids":["16574654"],"is_preprint":false},{"year":2005,"finding":"Egr-1 directly activates the NAB2 promoter through Egr-binding sites (including a cluster between -329 and -260 bp), and NAB2 in turn represses its own promoter, establishing a negative feedback loop. Depletion of Egr-1 by siRNA reduces NAB2 expression.","method":"Promoter cloning, reporter assay, EMSA, siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (EMSA, reporter, siRNA) establishing the feedback mechanism","pmids":["16260776"],"is_preprint":false},{"year":1998,"finding":"Overexpression of NAB2 in PC12 cells inhibits NGF-induced differentiation and maintains proliferation, while downstream NGF response genes (TGF-beta1, MMP-3) are repressed and p21(WAF1) is downregulated. This places NAB2 as a repressor of Egr1-dependent differentiation programs.","method":"Stable transfection, adenoviral overexpression, gene expression analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — clean loss/gain-of-function with defined molecular and cellular phenotypes, multiple experimental approaches","pmids":["9722618"],"is_preprint":false},{"year":2002,"finding":"NAB2 overexpression inhibits VEGF-induced expression of tissue factor, VEGF receptor-1, and urokinase plasminogen activator, and blocks tubule and sprout formation in angiogenesis assays. NAB2 levels are reciprocally regulated with EGR-1 following VEGF treatment.","method":"Adenovirus-mediated overexpression, reporter assay, in vitro angiogenesis assay, Matrigel model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple in vitro and in vivo assays with clear mechanistic readouts","pmids":["12427750"],"is_preprint":false},{"year":2013,"finding":"NAB2-STAT6 gene fusion is the defining driver mutation of solitary fibrous tumor (SFT). The fusion protein harbors the EGR-binding domain of NAB2 fused to the transactivation domain of STAT6, converting a transcriptional repressor into a transcriptional activator. Overexpression of NAB2-STAT6 induces proliferation and activates EGR-responsive genes.","method":"Whole-exome and transcriptome sequencing, RT-PCR, overexpression in cultured cells, gene expression analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1-2 — discovery paper with sequencing, RT-PCR validation in 51 tumors, and functional cell-based assays; highly cited and replicated","pmids":["23313952"],"is_preprint":false},{"year":2013,"finding":"The NAB2-STAT6 fusion protein causes nuclear relocalization of STAT6 (normally cytoplasmic), which can be used as a surrogate diagnostic marker. Tissues without the fusion show nuclear NAB2 and cytoplasmic STAT6.","method":"Proximity ligation assay, STAT6 immunohistochemistry, exome sequencing","journal":"Acta neuropathologica","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (PLA, IHC, sequencing) across large tumor cohort; replicated in multiple subsequent studies","pmids":["23575898"],"is_preprint":false},{"year":2009,"finding":"NAB2 suppresses TGF-beta-induced fibroblast activation (collagen synthesis and myofibroblast differentiation) by recruiting the NuRD chromatin remodeling complex to the COL1A2 promoter, reducing histone H4 acetylation. Nab2 knockout mice show increased dermal collagen accumulation.","method":"Ectopic expression, siRNA knockdown, ChIP, Nab2 knockout mouse model, collagen synthesis assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO phenotype plus mechanistic ChIP and in vitro functional assays","pmids":["19888474"],"is_preprint":false},{"year":2006,"finding":"NAB2 acts as a coactivator for Egr-1 at the IL-2 promoter in T cells: NAB2 overexpression enhances IL-2 production while siRNA-mediated knockdown inhibits it. ChIP shows NAB2 is recruited to the Egr-1 binding site on the IL-2 promoter.","method":"Overexpression, siRNA knockdown, chromatin immunoprecipitation, cytokine measurement","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — ChIP plus complementary gain/loss-of-function experiments linking NAB2 to IL-2 promoter occupancy and production","pmids":["17142725"],"is_preprint":false},{"year":2011,"finding":"NAB2 regulates secondary CD8+ T-cell responses by repressing TRAIL expression. Enforced NAB2 expression prevents TRAIL induction in helpless CD8+ T cells after restimulation; dominant-negative NAB2 impairs secondary proliferation reversible by TRAIL blockade. IL-2 coordinately increases NAB2 and decreases TRAIL.","method":"Retroviral overexpression, dominant-negative expression, TRAIL blockade, transcriptional profiling","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — multiple complementary gain/loss-of-function experiments with epistasis (rescue by TRAIL blockade)","pmids":["22128144"],"is_preprint":false},{"year":2010,"finding":"EGR1, EGR2, and EGR3 all activate NAB2 transcription through similar cis-regulatory elements in melanoma/carcinoma cells, and NAB2 represses this activation, establishing a negative feedback loop. siRNA depletion of each EGR reduces endogenous NAB2 levels.","method":"Reporter assay, siRNA knockdown, promoter analysis","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 2 — consistent across multiple EGR family members with both gain and loss-of-function approaches","pmids":["20506119"],"is_preprint":false},{"year":1999,"finding":"NAB2 is expressed in vascular smooth muscle cells (VSMC) in response to PMA and FGF-2, trails Egr-1 induction kinetically, and inhibits Egr-1-dependent gene expression in VSMC. NAB2 levels also increase transiently in vivo after mechanical arterial injury coinciding with elevated Egr-1.","method":"Western blot, mRNA analysis, reporter assay, in vivo arterial injury model","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 — in vitro functional repression plus in vivo model, multiple readouts","pmids":["10514413"],"is_preprint":false},{"year":2001,"finding":"NAB2 blocks Egr-1-mediated transcriptional activation of tissue factor promoter and suppresses production of PDGF-AB, HGF, TGFbeta1, and VEGF. Wild-type but not dominant-negative NAB2 blocks tubule formation in an in vitro angiogenesis model.","method":"Reporter assay, dominant-negative analysis, ELISA, in vitro angiogenesis assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — dominant-negative approach identifies functional domain requirement; multiple target gene readouts","pmids":["11327726"],"is_preprint":false},{"year":2020,"finding":"NAB2-STAT6 fusion activates EGR-1 transcription and its target gene IGF2, upregulates cyclin D1 and phospho-Rb, and enhances cell proliferation and oncogenic transformation. IGF2 inhibitor treatment reduces NAB2-STAT6-driven proliferation.","method":"Transfection, Western blot, gene expression analysis, IGF2 inhibitor treatment, soft-agar assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — single lab, multiple methods but modest mechanistic depth","pmids":["32216968"],"is_preprint":false},{"year":2025,"finding":"NAB2-STAT6 operates as a transcriptional coactivator at EGR1-targeted enhancers and promoters. In physiological conditions, NAB2 is primarily cytoplasmic; NAB2-STAT6 redirects NAB1, NAB2, and EGR1 to the nucleus and bolsters expression of neuronal EGR1 targets. The STAT6 moiety drives nuclear localization of the fusion and contributes to co-activating ability. The fusion activates a neuroendocrine gene signature in SFTs.","method":"Inducible cell model, primary tumor samples, ChIP-seq/ATAC-seq, transcriptomics","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 — inducible model plus primary samples, genome-wide chromatin profiling, mechanistic dissection of fusion domains","pmids":["40875449"],"is_preprint":false},{"year":2018,"finding":"The nuclear localization signal (NLS) of NAB2 maps to the KKXK343-346 motif, which is necessary and sufficient for nuclear localization. Mutation of KKXK to AAXA causes cytoplasmic mislocalization; upstream K(X2)R motif is dispensable. Fusion of KKXK to cytoplasmic eIF2Bε causes its nuclear import.","method":"Site-directed mutagenesis, GFP fusion localization, domain transplantation","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with domain transplantation establishing necessity and sufficiency","pmids":["30411343"],"is_preprint":false},{"year":2006,"finding":"FGF23 induces two isoforms of NAB2 (corepressors of Egr-1) in addition to Egr-1 itself. Both NAB2 isoforms are nuclear and suppress Egr-1 transcriptional activity, establishing a negative feedback loop downstream of FGF23 signaling.","method":"Expression analysis, nuclear localization assay, transcriptional reporter assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, functional reporter assay with localization, limited mechanistic depth","pmids":["17174939"],"is_preprint":false},{"year":2012,"finding":"EGR1 and NAB2 act in concert to positively regulate p130(Cas)/BCAR1 expression in breast cancer cells. ChIP shows both EGR1 and NAB2 are recruited to the BCAR1 5' region. In MCF-7 cells, p130(Cas) positively regulates EGR1 and NAB2 in a feedback loop.","method":"Overexpression, siRNA knockdown, chromatin immunoprecipitation, reporter assay","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus gain/loss-of-function, single lab","pmids":["22431919"],"is_preprint":false},{"year":2017,"finding":"WT1 binds and transactivates the proximal NAB2 promoter, and WT1 can recruit NAB2 to the IRF8 promoter, where NAB2 modulates WT1 transcriptional activity.","method":"ChIP, luciferase reporter assay, overexpression/knockdown of WT1","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter assay, single lab","pmids":["29152069"],"is_preprint":false},{"year":2013,"finding":"NAB2 and EGR-1 exert opposing roles in regulating TRAIL expression in NK cells: NAB2 promotes TRAIL induction while EGR-1 acts as a brake. NAB2 is induced by IL-2 and IL-15 in NK cells.","method":"Overexpression, knockdown, cytokine stimulation, TRAIL expression analysis","journal":"Immunology letters","confidence":"Medium","confidence_rationale":"Tier 2 — complementary gain/loss-of-function, single lab","pmids":["23416169"],"is_preprint":false},{"year":2008,"finding":"TCR-induced Egr-1 and NAB2 enhance T cell function and require AP-1-mediated transcription. Egr-2 and Egr-3 (induced by NF-AT without AP-1) suppress Egr-1 and NAB2 expression. Egr-3 is upstream of Egr-2. T cells from Egr-2/3 null mice are hyperresponsive while Egr-3 transgenic T cells are hyporesponsive.","method":"Genetic mouse models (knockout, transgenic), transcriptional reporter analysis, T cell functional assays","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic models (KO/transgenic) with functional readouts plus mechanistic promoter analysis","pmids":["18203138"],"is_preprint":false},{"year":1997,"finding":"The NAB2 and STAT6 genes are in close genomic proximity on chromosome 12q13 with convergent transcripts that overlap by 58 bp. Alternative splicing of NAB2 (lacking exon 3) produces a protein lacking the ability to repress NGFI-A/Krox20.","method":"Genomic sequencing, transcript analysis, functional repression assay","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 1-2 — direct sequencing of genomic locus and functional characterization of splice variant","pmids":["9126479"],"is_preprint":false}],"current_model":"NAB2 is a transcriptional coregulator that normally localizes to the nucleus (via a KKXK NLS) and represses EGR-family transcription factors (EGR1/NGFI-A, EGR2/Krox20, EGR3) by binding their R1 domain through its NCD1 domain and recruiting the CHD4/NuRD chromatin remodeling complex; EGR1 in turn induces NAB2 expression through the NAB2 promoter, creating a negative feedback loop that limits EGR-dependent transcription of mitogenic, fibrotic, and angiogenic target genes—while in solitary fibrous tumors, an intrachromosomal NAB2-STAT6 gene fusion converts this repressor into a nuclear-localizing transcriptional coactivator that drives EGR1-dependent neuronal/neuroendocrine target gene expression and cell proliferation."},"narrative":{"teleology":[{"year":1996,"claim":"Establishing that NAB2 is a transcriptional corepressor that directly binds EGR-family transcription factors resolved how EGR-driven transcription is attenuated, revealing the NCD1 domain as the interaction interface with the EGR R1 domain.","evidence":"Protein interaction mapping and transcriptional repression assays using NGFI-A/Krox20","pmids":["8668170"],"confidence":"High","gaps":["No structural detail of the NCD1–R1 interaction","Mechanism of repression beyond binding not addressed"]},{"year":1997,"claim":"Mapping the NAB2 and STAT6 genes to convergent overlapping loci on 12q13 and identifying an alternatively spliced NAB2 isoform lacking repressor activity established the genomic architecture that later explained the recurrent NAB2-STAT6 fusion.","evidence":"Genomic sequencing, transcript analysis, and functional repression assays of splice variants","pmids":["9126479"],"confidence":"High","gaps":["Physiological relevance of the alternative splice isoform unclear","Regulation of alternative splicing not defined"]},{"year":1998,"claim":"Demonstrating that NAB2 overexpression blocks NGF-induced differentiation and maintains proliferation in PC12 cells placed NAB2 as a functional antagonist of EGR1-driven differentiation programs at the cellular level.","evidence":"Stable transfection and adenoviral overexpression with gene expression analysis in PC12 cells","pmids":["9722618"],"confidence":"High","gaps":["Endogenous loss-of-function not shown in this system","Direct target genes mediating the proliferative phenotype not identified"]},{"year":2001,"claim":"Showing that NAB2 suppresses EGR1-mediated transcription of tissue factor, PDGF, VEGF, and blocks angiogenesis in vitro expanded the biological scope of NAB2 repression to vascular biology and growth factor signaling.","evidence":"Reporter assays, dominant-negative analysis, ELISA, and in vitro angiogenesis assays","pmids":["11327726","12427750"],"confidence":"High","gaps":["In vivo vascular phenotype of NAB2 loss not established at this point","Mechanism distinguishing dominant-negative from wild-type activity not fully resolved"]},{"year":2005,"claim":"Identifying that EGR1 directly activates the NAB2 promoter and NAB2 represses its own transcription established a negative feedback loop as the core regulatory logic of EGR-NAB signaling.","evidence":"Promoter cloning, reporter assay, EMSA, and siRNA knockdown of EGR1","pmids":["16260776","20506119"],"confidence":"High","gaps":["Kinetics and dynamics of the feedback loop in physiological settings not modeled","Whether all EGR members contribute equally in different tissues unclear"]},{"year":2006,"claim":"Identifying CHD4/NuRD as the chromatin remodeling effector recruited by NAB2 resolved the mechanistic basis of transcriptional repression, showing that NAB2 represses targets by remodeling chromatin rather than simply blocking activator function.","evidence":"Co-immunoprecipitation, ChIP at the Rad promoter in Schwann cells, repression assays, and alternative splicing analysis","pmids":["16574654"],"confidence":"High","gaps":["Whether CHD3 vs CHD4 recruitment differs functionally","Full composition of the NAB2-associated repressive complex not defined"]},{"year":2006,"claim":"Discovery that NAB2 can act as a coactivator of EGR1 at the IL-2 promoter in T cells revealed context-dependent dual functionality, challenging the view of NAB2 as a constitutive repressor.","evidence":"Overexpression, siRNA knockdown, ChIP at IL-2 promoter, and cytokine measurement in T cells","pmids":["17142725"],"confidence":"High","gaps":["Molecular basis for the switch from corepressor to coactivator unknown","Whether coactivation involves distinct cofactors or post-translational modifications not tested"]},{"year":2009,"claim":"Demonstrating that Nab2 knockout mice exhibit increased dermal collagen accumulation, linked mechanistically to NuRD recruitment and histone deacetylation at COL1A2, provided the first in vivo genetic evidence that NAB2 is an endogenous anti-fibrotic factor.","evidence":"Nab2 knockout mouse, ChIP showing NuRD occupancy at COL1A2, collagen synthesis assays","pmids":["19888474"],"confidence":"High","gaps":["Full spectrum of fibrotic target genes repressed by NAB2 in vivo not mapped","Whether NAB2 loss phenocopies specific fibrotic diseases not tested"]},{"year":2011,"claim":"Showing that NAB2 represses TRAIL in CD8+ T cells to enable secondary expansion—rescuable by TRAIL blockade—established NAB2 as a regulator of adaptive immune memory through an epistatic mechanism.","evidence":"Retroviral overexpression, dominant-negative expression, TRAIL blockade rescue in CD8+ T cells","pmids":["22128144"],"confidence":"High","gaps":["Whether NAB2 regulation of TRAIL is direct or via intermediate EGR targets at the chromatin level","Relevance to infection models in vivo not shown"]},{"year":2013,"claim":"Discovery of the NAB2-STAT6 gene fusion as the universal driver of solitary fibrous tumors fundamentally reframed NAB2's disease relevance, showing that fusion of its EGR-binding domain to the STAT6 transactivation domain converts NAB2 from a repressor to a nuclear transcriptional activator driving proliferation.","evidence":"Whole-exome/transcriptome sequencing of 51 SFTs, RT-PCR validation, overexpression in cultured cells, proximity ligation assay, and STAT6 IHC","pmids":["23313952","23575898"],"confidence":"High","gaps":["Precise mechanism by which the fusion activates rather than represses at EGR-bound sites","Whether the fusion requires endogenous EGR1 or can function autonomously"]},{"year":2018,"claim":"Mapping the NAB2 nuclear localization signal to the KKXK343-346 motif resolved how NAB2 enters the nucleus and clarified why endogenous STAT6 (normally cytoplasmic) becomes nuclear when fused to NAB2.","evidence":"Site-directed mutagenesis, GFP fusion localization, domain transplantation to eIF2Bε","pmids":["30411343"],"confidence":"High","gaps":["Import receptor that recognizes the KKXK motif not identified","Whether NLS masking regulates NAB2 cytoplasmic retention under certain conditions"]},{"year":2025,"claim":"Genome-wide chromatin profiling established that NAB2-STAT6 functions as a coactivator at EGR1-targeted enhancers and promoters, activating a neuronal/neuroendocrine gene signature and redirecting endogenous NAB1, NAB2, and EGR1 to the nucleus, resolving the transcriptional mechanism underlying SFT oncogenesis.","evidence":"Inducible cell model, primary SFT samples, ChIP-seq/ATAC-seq, transcriptomics","pmids":["40875449"],"confidence":"High","gaps":["How the STAT6 transactivation domain overrides NuRD-mediated repression mechanistically","Whether therapeutic disruption of the NAB2-STAT6–EGR1 interaction is feasible"]},{"year":null,"claim":"The molecular basis for context-dependent switching between corepression and coactivation by wild-type NAB2, the identity of the nuclear import receptor recognizing KKXK, and the structural details of the NCD1–EGR R1 interaction remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of NAB2 or the NAB2–EGR complex","Mechanism of coactivation at IL-2 and BCAR1 promoters not reconciled with NuRD-dependent repression","Post-translational modifications regulating NAB2 function largely uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2,3,7,8,10,14]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,15,16]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,2,7,8,14]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[1,7]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,9,20]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,13,14]}],"complexes":["NuRD complex (via CHD4)"],"partners":["EGR1","EGR2","EGR3","CHD4","CHD3","STAT6","WT1"],"other_free_text":[]},"mechanistic_narrative":"NAB2 is a transcriptional coregulator of the EGR family of zinc-finger transcription factors that operates primarily as a repressor but can function context-dependently as a coactivator. NAB2 binds the R1 domain of EGR1, EGR2, and EGR3 through its NCD1 domain and recruits the CHD4/NuRD chromatin remodeling complex to repress target genes involved in mitogenesis, fibrosis, and angiogenesis, including tissue factor, collagen, VEGF, and TRAIL [PMID:8668170, PMID:16574654, PMID:12427750, PMID:19888474, PMID:22128144]. EGR family members directly activate NAB2 transcription, while NAB2 represses its own promoter, establishing a negative feedback loop that limits EGR-dependent transcriptional programs in vascular, immune, and neural contexts [PMID:16260776, PMID:20506119]. In solitary fibrous tumors, an intrachromosomal NAB2-STAT6 gene fusion converts NAB2 from a repressor into a nuclear transcriptional coactivator that drives EGR1-dependent neuroendocrine gene expression and cell proliferation [PMID:23313952, PMID:40875449]."},"prefetch_data":{"uniprot":{"accession":"Q15742","full_name":"NGFI-A-binding protein 2","aliases":["EGR-1-binding protein 2","Melanoma-associated delayed early response protein","Protein MADER"],"length_aa":525,"mass_kda":56.6,"function":"Acts as a transcriptional repressor for zinc finger transcription factors EGR1 and EGR2. Isoform 2 lacks repression ability (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q15742/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NAB2","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NAB2","total_profiled":1310},"omim":[{"mim_id":"613279","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 14: ZC3H14","url":"https://www.omim.org/entry/613279"},{"mim_id":"602381","title":"NGFIA-BINDING PROTEIN 2; NAB2","url":"https://www.omim.org/entry/602381"},{"mim_id":"602278","title":"NEURAL PRECURSOR CELL EXPRESSED, DEVELOPMENTALLY DOWNREGULATED 4; NEDD4","url":"https://www.omim.org/entry/602278"},{"mim_id":"601512","title":"SIGNAL TRANSDUCER AND ACTIVATOR OF TRANSCRIPTION 6; STAT6","url":"https://www.omim.org/entry/601512"},{"mim_id":"601074","title":"CUGBP- AND ELAV-LIKE FAMILY, MEMBER 1; CELF1","url":"https://www.omim.org/entry/601074"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NAB2"},"hgnc":{"alias_symbol":["MADER"],"prev_symbol":[]},"alphafold":{"accession":"Q15742","domains":[{"cath_id":"1.10.150","chopping":"39-112","consensus_level":"high","plddt":92.6077,"start":39,"end":112},{"cath_id":"1.20.120.2010","chopping":"238-362","consensus_level":"high","plddt":87.4886,"start":238,"end":362}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15742","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15742-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15742-F1-predicted_aligned_error_v6.png","plddt_mean":62.47},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NAB2","jax_strain_url":"https://www.jax.org/strain/search?query=NAB2"},"sequence":{"accession":"Q15742","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15742.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15742/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15742"}},"corpus_meta":[{"pmid":"23313952","id":"PMC_23313952","title":"Identification of recurrent NAB2-STAT6 gene fusions in solitary fibrous tumor by integrative sequencing.","date":"2013","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23313952","citation_count":609,"is_preprint":false},{"pmid":"8668170","id":"PMC_8668170","title":"NAB2, a corepressor of NGFI-A (Egr-1) and Krox20, is induced by proliferative and differentiative stimuli.","date":"1996","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/8668170","citation_count":327,"is_preprint":false},{"pmid":"23575898","id":"PMC_23575898","title":"Meningeal hemangiopericytoma and solitary fibrous tumors carry the NAB2-STAT6 fusion and can be diagnosed by nuclear expression of STAT6 protein.","date":"2013","source":"Acta neuropathologica","url":"https://pubmed.ncbi.nlm.nih.gov/23575898","citation_count":286,"is_preprint":false},{"pmid":"24513261","id":"PMC_24513261","title":"Solitary fibrous tumors/hemangiopericytomas with different variants of the NAB2-STAT6 gene fusion are characterized by specific histomorphology and distinct clinicopathological features.","date":"2014","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/24513261","citation_count":187,"is_preprint":false},{"pmid":"8474438","id":"PMC_8474438","title":"NAB2: a yeast nuclear polyadenylated RNA-binding protein essential for cell viability.","date":"1993","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/8474438","citation_count":157,"is_preprint":false},{"pmid":"26226844","id":"PMC_26226844","title":"NAB2-STAT6 fusion types account for clinicopathological variations in solitary fibrous tumors.","date":"2015","source":"Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc","url":"https://pubmed.ncbi.nlm.nih.gov/26226844","citation_count":129,"is_preprint":false},{"pmid":"25582503","id":"PMC_25582503","title":"Distinct clinicopathological features of NAB2-STAT6 fusion gene variants in solitary fibrous tumor with emphasis on the acquisition of highly malignant potential.","date":"2014","source":"Human pathology","url":"https://pubmed.ncbi.nlm.nih.gov/25582503","citation_count":115,"is_preprint":false},{"pmid":"24702701","id":"PMC_24702701","title":"Nuclear relocation of STAT6 reliably predicts NAB2-STAT6 fusion for the diagnosis of solitary fibrous tumour.","date":"2014","source":"Histopathology","url":"https://pubmed.ncbi.nlm.nih.gov/24702701","citation_count":103,"is_preprint":false},{"pmid":"16574654","id":"PMC_16574654","title":"NAB2 represses transcription by interacting with the CHD4 subunit of the nucleosome remodeling and deacetylase (NuRD) complex.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16574654","citation_count":96,"is_preprint":false},{"pmid":"19840948","id":"PMC_19840948","title":"Purification of nuclear poly(A)-binding protein Nab2 reveals association with the yeast transcriptome 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Femur.","date":"2021","source":"Cureus","url":"https://pubmed.ncbi.nlm.nih.gov/33628684","citation_count":5,"is_preprint":false},{"pmid":"38523251","id":"PMC_38523251","title":"NAB2::STAT6 fusions and genome-wide DNA methylation profiling: Predictors of patient outcomes in meningeal solitary fibrous tumors.","date":"2024","source":"Brain pathology (Zurich, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/38523251","citation_count":5,"is_preprint":false},{"pmid":"32817074","id":"PMC_32817074","title":"A Genetic Screen Links the Disease-Associated Nab2 RNA-Binding Protein to the Planar Cell Polarity Pathway in Drosophila melanogaster.","date":"2020","source":"G3 (Bethesda, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/32817074","citation_count":4,"is_preprint":false},{"pmid":"30411343","id":"PMC_30411343","title":"Refining the nuclear localization signal within the Egr transcriptional coregulator NAB2.","date":"2018","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/30411343","citation_count":3,"is_preprint":false},{"pmid":"40875449","id":"PMC_40875449","title":"NAB2-STAT6 drives an EGR1-dependent neuroendocrine program in solitary fibrous tumors.","date":"2025","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/40875449","citation_count":3,"is_preprint":false},{"pmid":"38985523","id":"PMC_38985523","title":"The RNA-binding protein Nab2 regulates levels of the RhoGEF Trio to govern axon and dendrite morphology.","date":"2024","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/38985523","citation_count":3,"is_preprint":false},{"pmid":"26136329","id":"PMC_26136329","title":"[Two Cases of Primary Intracranial Solitary Fibrous Tumor:Genetic Examination of NAB2-STAT6 Fusion and Its Association with Hemangiopericytoma].","date":"2015","source":"No shinkei geka. Neurological surgery","url":"https://pubmed.ncbi.nlm.nih.gov/26136329","citation_count":3,"is_preprint":false},{"pmid":"29152069","id":"PMC_29152069","title":"The transcriptional coregulator NAB2 is a target gene for the Wilms' tumor gene 1 protein (WT1) in leukemic cells.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/29152069","citation_count":3,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50734,"output_tokens":4833,"usd":0.112349},"stage2":{"model":"claude-opus-4-6","input_tokens":8362,"output_tokens":3049,"usd":0.177053},"total_usd":0.289402,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"NAB2 functions as a transcriptional corepressor that directly interacts with the R1 domain of NGFI-A (Egr-1) and Krox20, repressing their transcriptional activation activity. The first conserved domain (NCD1) of NAB2 mediates this interaction.\",\n      \"method\": \"Protein interaction mapping, transcriptional repression assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — original discovery with direct binding domain mapping and functional repression assays, replicated across multiple subsequent studies\",\n      \"pmids\": [\"8668170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NAB2 represses transcription via at least two repression domains, one of which requires interaction with CHD4, a subunit of the NuRD (nucleosome remodeling and deacetylase) chromatin remodeling complex. Both NAB1 and NAB2 bind CHD3 or CHD4. NAB2 and CHD4 co-occupy the Rad gene promoter in myelinating Schwann cells, and interaction with CHD4 is regulated by alternative splicing of NAB2 mRNA.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation, transcriptional repression assays, alternative splicing analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ChIP at endogenous locus, and functional repression assays in a single study\",\n      \"pmids\": [\"16574654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Egr-1 directly activates the NAB2 promoter through Egr-binding sites (including a cluster between -329 and -260 bp), and NAB2 in turn represses its own promoter, establishing a negative feedback loop. Depletion of Egr-1 by siRNA reduces NAB2 expression.\",\n      \"method\": \"Promoter cloning, reporter assay, EMSA, siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (EMSA, reporter, siRNA) establishing the feedback mechanism\",\n      \"pmids\": [\"16260776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Overexpression of NAB2 in PC12 cells inhibits NGF-induced differentiation and maintains proliferation, while downstream NGF response genes (TGF-beta1, MMP-3) are repressed and p21(WAF1) is downregulated. This places NAB2 as a repressor of Egr1-dependent differentiation programs.\",\n      \"method\": \"Stable transfection, adenoviral overexpression, gene expression analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss/gain-of-function with defined molecular and cellular phenotypes, multiple experimental approaches\",\n      \"pmids\": [\"9722618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NAB2 overexpression inhibits VEGF-induced expression of tissue factor, VEGF receptor-1, and urokinase plasminogen activator, and blocks tubule and sprout formation in angiogenesis assays. NAB2 levels are reciprocally regulated with EGR-1 following VEGF treatment.\",\n      \"method\": \"Adenovirus-mediated overexpression, reporter assay, in vitro angiogenesis assay, Matrigel model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo assays with clear mechanistic readouts\",\n      \"pmids\": [\"12427750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NAB2-STAT6 gene fusion is the defining driver mutation of solitary fibrous tumor (SFT). The fusion protein harbors the EGR-binding domain of NAB2 fused to the transactivation domain of STAT6, converting a transcriptional repressor into a transcriptional activator. Overexpression of NAB2-STAT6 induces proliferation and activates EGR-responsive genes.\",\n      \"method\": \"Whole-exome and transcriptome sequencing, RT-PCR, overexpression in cultured cells, gene expression analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — discovery paper with sequencing, RT-PCR validation in 51 tumors, and functional cell-based assays; highly cited and replicated\",\n      \"pmids\": [\"23313952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The NAB2-STAT6 fusion protein causes nuclear relocalization of STAT6 (normally cytoplasmic), which can be used as a surrogate diagnostic marker. Tissues without the fusion show nuclear NAB2 and cytoplasmic STAT6.\",\n      \"method\": \"Proximity ligation assay, STAT6 immunohistochemistry, exome sequencing\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (PLA, IHC, sequencing) across large tumor cohort; replicated in multiple subsequent studies\",\n      \"pmids\": [\"23575898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NAB2 suppresses TGF-beta-induced fibroblast activation (collagen synthesis and myofibroblast differentiation) by recruiting the NuRD chromatin remodeling complex to the COL1A2 promoter, reducing histone H4 acetylation. Nab2 knockout mice show increased dermal collagen accumulation.\",\n      \"method\": \"Ectopic expression, siRNA knockdown, ChIP, Nab2 knockout mouse model, collagen synthesis assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO phenotype plus mechanistic ChIP and in vitro functional assays\",\n      \"pmids\": [\"19888474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NAB2 acts as a coactivator for Egr-1 at the IL-2 promoter in T cells: NAB2 overexpression enhances IL-2 production while siRNA-mediated knockdown inhibits it. ChIP shows NAB2 is recruited to the Egr-1 binding site on the IL-2 promoter.\",\n      \"method\": \"Overexpression, siRNA knockdown, chromatin immunoprecipitation, cytokine measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus complementary gain/loss-of-function experiments linking NAB2 to IL-2 promoter occupancy and production\",\n      \"pmids\": [\"17142725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NAB2 regulates secondary CD8+ T-cell responses by repressing TRAIL expression. Enforced NAB2 expression prevents TRAIL induction in helpless CD8+ T cells after restimulation; dominant-negative NAB2 impairs secondary proliferation reversible by TRAIL blockade. IL-2 coordinately increases NAB2 and decreases TRAIL.\",\n      \"method\": \"Retroviral overexpression, dominant-negative expression, TRAIL blockade, transcriptional profiling\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple complementary gain/loss-of-function experiments with epistasis (rescue by TRAIL blockade)\",\n      \"pmids\": [\"22128144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"EGR1, EGR2, and EGR3 all activate NAB2 transcription through similar cis-regulatory elements in melanoma/carcinoma cells, and NAB2 represses this activation, establishing a negative feedback loop. siRNA depletion of each EGR reduces endogenous NAB2 levels.\",\n      \"method\": \"Reporter assay, siRNA knockdown, promoter analysis\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — consistent across multiple EGR family members with both gain and loss-of-function approaches\",\n      \"pmids\": [\"20506119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"NAB2 is expressed in vascular smooth muscle cells (VSMC) in response to PMA and FGF-2, trails Egr-1 induction kinetically, and inhibits Egr-1-dependent gene expression in VSMC. NAB2 levels also increase transiently in vivo after mechanical arterial injury coinciding with elevated Egr-1.\",\n      \"method\": \"Western blot, mRNA analysis, reporter assay, in vivo arterial injury model\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro functional repression plus in vivo model, multiple readouts\",\n      \"pmids\": [\"10514413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NAB2 blocks Egr-1-mediated transcriptional activation of tissue factor promoter and suppresses production of PDGF-AB, HGF, TGFbeta1, and VEGF. Wild-type but not dominant-negative NAB2 blocks tubule formation in an in vitro angiogenesis model.\",\n      \"method\": \"Reporter assay, dominant-negative analysis, ELISA, in vitro angiogenesis assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — dominant-negative approach identifies functional domain requirement; multiple target gene readouts\",\n      \"pmids\": [\"11327726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NAB2-STAT6 fusion activates EGR-1 transcription and its target gene IGF2, upregulates cyclin D1 and phospho-Rb, and enhances cell proliferation and oncogenic transformation. IGF2 inhibitor treatment reduces NAB2-STAT6-driven proliferation.\",\n      \"method\": \"Transfection, Western blot, gene expression analysis, IGF2 inhibitor treatment, soft-agar assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab, multiple methods but modest mechanistic depth\",\n      \"pmids\": [\"32216968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NAB2-STAT6 operates as a transcriptional coactivator at EGR1-targeted enhancers and promoters. In physiological conditions, NAB2 is primarily cytoplasmic; NAB2-STAT6 redirects NAB1, NAB2, and EGR1 to the nucleus and bolsters expression of neuronal EGR1 targets. The STAT6 moiety drives nuclear localization of the fusion and contributes to co-activating ability. The fusion activates a neuroendocrine gene signature in SFTs.\",\n      \"method\": \"Inducible cell model, primary tumor samples, ChIP-seq/ATAC-seq, transcriptomics\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — inducible model plus primary samples, genome-wide chromatin profiling, mechanistic dissection of fusion domains\",\n      \"pmids\": [\"40875449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The nuclear localization signal (NLS) of NAB2 maps to the KKXK343-346 motif, which is necessary and sufficient for nuclear localization. Mutation of KKXK to AAXA causes cytoplasmic mislocalization; upstream K(X2)R motif is dispensable. Fusion of KKXK to cytoplasmic eIF2Bε causes its nuclear import.\",\n      \"method\": \"Site-directed mutagenesis, GFP fusion localization, domain transplantation\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with domain transplantation establishing necessity and sufficiency\",\n      \"pmids\": [\"30411343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FGF23 induces two isoforms of NAB2 (corepressors of Egr-1) in addition to Egr-1 itself. Both NAB2 isoforms are nuclear and suppress Egr-1 transcriptional activity, establishing a negative feedback loop downstream of FGF23 signaling.\",\n      \"method\": \"Expression analysis, nuclear localization assay, transcriptional reporter assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, functional reporter assay with localization, limited mechanistic depth\",\n      \"pmids\": [\"17174939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"EGR1 and NAB2 act in concert to positively regulate p130(Cas)/BCAR1 expression in breast cancer cells. ChIP shows both EGR1 and NAB2 are recruited to the BCAR1 5' region. In MCF-7 cells, p130(Cas) positively regulates EGR1 and NAB2 in a feedback loop.\",\n      \"method\": \"Overexpression, siRNA knockdown, chromatin immunoprecipitation, reporter assay\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus gain/loss-of-function, single lab\",\n      \"pmids\": [\"22431919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"WT1 binds and transactivates the proximal NAB2 promoter, and WT1 can recruit NAB2 to the IRF8 promoter, where NAB2 modulates WT1 transcriptional activity.\",\n      \"method\": \"ChIP, luciferase reporter assay, overexpression/knockdown of WT1\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assay, single lab\",\n      \"pmids\": [\"29152069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NAB2 and EGR-1 exert opposing roles in regulating TRAIL expression in NK cells: NAB2 promotes TRAIL induction while EGR-1 acts as a brake. NAB2 is induced by IL-2 and IL-15 in NK cells.\",\n      \"method\": \"Overexpression, knockdown, cytokine stimulation, TRAIL expression analysis\",\n      \"journal\": \"Immunology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — complementary gain/loss-of-function, single lab\",\n      \"pmids\": [\"23416169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TCR-induced Egr-1 and NAB2 enhance T cell function and require AP-1-mediated transcription. Egr-2 and Egr-3 (induced by NF-AT without AP-1) suppress Egr-1 and NAB2 expression. Egr-3 is upstream of Egr-2. T cells from Egr-2/3 null mice are hyperresponsive while Egr-3 transgenic T cells are hyporesponsive.\",\n      \"method\": \"Genetic mouse models (knockout, transgenic), transcriptional reporter analysis, T cell functional assays\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic models (KO/transgenic) with functional readouts plus mechanistic promoter analysis\",\n      \"pmids\": [\"18203138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The NAB2 and STAT6 genes are in close genomic proximity on chromosome 12q13 with convergent transcripts that overlap by 58 bp. Alternative splicing of NAB2 (lacking exon 3) produces a protein lacking the ability to repress NGFI-A/Krox20.\",\n      \"method\": \"Genomic sequencing, transcript analysis, functional repression assay\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct sequencing of genomic locus and functional characterization of splice variant\",\n      \"pmids\": [\"9126479\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NAB2 is a transcriptional coregulator that normally localizes to the nucleus (via a KKXK NLS) and represses EGR-family transcription factors (EGR1/NGFI-A, EGR2/Krox20, EGR3) by binding their R1 domain through its NCD1 domain and recruiting the CHD4/NuRD chromatin remodeling complex; EGR1 in turn induces NAB2 expression through the NAB2 promoter, creating a negative feedback loop that limits EGR-dependent transcription of mitogenic, fibrotic, and angiogenic target genes—while in solitary fibrous tumors, an intrachromosomal NAB2-STAT6 gene fusion converts this repressor into a nuclear-localizing transcriptional coactivator that drives EGR1-dependent neuronal/neuroendocrine target gene expression and cell proliferation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NAB2 is a transcriptional coregulator of the EGR family of zinc-finger transcription factors that operates primarily as a repressor but can function context-dependently as a coactivator. NAB2 binds the R1 domain of EGR1, EGR2, and EGR3 through its NCD1 domain and recruits the CHD4/NuRD chromatin remodeling complex to repress target genes involved in mitogenesis, fibrosis, and angiogenesis, including tissue factor, collagen, VEGF, and TRAIL [PMID:8668170, PMID:16574654, PMID:12427750, PMID:19888474, PMID:22128144]. EGR family members directly activate NAB2 transcription, while NAB2 represses its own promoter, establishing a negative feedback loop that limits EGR-dependent transcriptional programs in vascular, immune, and neural contexts [PMID:16260776, PMID:20506119]. In solitary fibrous tumors, an intrachromosomal NAB2-STAT6 gene fusion converts NAB2 from a repressor into a nuclear transcriptional coactivator that drives EGR1-dependent neuroendocrine gene expression and cell proliferation [PMID:23313952, PMID:40875449].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing that NAB2 is a transcriptional corepressor that directly binds EGR-family transcription factors resolved how EGR-driven transcription is attenuated, revealing the NCD1 domain as the interaction interface with the EGR R1 domain.\",\n      \"evidence\": \"Protein interaction mapping and transcriptional repression assays using NGFI-A/Krox20\",\n      \"pmids\": [\"8668170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural detail of the NCD1–R1 interaction\", \"Mechanism of repression beyond binding not addressed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Mapping the NAB2 and STAT6 genes to convergent overlapping loci on 12q13 and identifying an alternatively spliced NAB2 isoform lacking repressor activity established the genomic architecture that later explained the recurrent NAB2-STAT6 fusion.\",\n      \"evidence\": \"Genomic sequencing, transcript analysis, and functional repression assays of splice variants\",\n      \"pmids\": [\"9126479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of the alternative splice isoform unclear\", \"Regulation of alternative splicing not defined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrating that NAB2 overexpression blocks NGF-induced differentiation and maintains proliferation in PC12 cells placed NAB2 as a functional antagonist of EGR1-driven differentiation programs at the cellular level.\",\n      \"evidence\": \"Stable transfection and adenoviral overexpression with gene expression analysis in PC12 cells\",\n      \"pmids\": [\"9722618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous loss-of-function not shown in this system\", \"Direct target genes mediating the proliferative phenotype not identified\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showing that NAB2 suppresses EGR1-mediated transcription of tissue factor, PDGF, VEGF, and blocks angiogenesis in vitro expanded the biological scope of NAB2 repression to vascular biology and growth factor signaling.\",\n      \"evidence\": \"Reporter assays, dominant-negative analysis, ELISA, and in vitro angiogenesis assays\",\n      \"pmids\": [\"11327726\", \"12427750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo vascular phenotype of NAB2 loss not established at this point\", \"Mechanism distinguishing dominant-negative from wild-type activity not fully resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identifying that EGR1 directly activates the NAB2 promoter and NAB2 represses its own transcription established a negative feedback loop as the core regulatory logic of EGR-NAB signaling.\",\n      \"evidence\": \"Promoter cloning, reporter assay, EMSA, and siRNA knockdown of EGR1\",\n      \"pmids\": [\"16260776\", \"20506119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetics and dynamics of the feedback loop in physiological settings not modeled\", \"Whether all EGR members contribute equally in different tissues unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying CHD4/NuRD as the chromatin remodeling effector recruited by NAB2 resolved the mechanistic basis of transcriptional repression, showing that NAB2 represses targets by remodeling chromatin rather than simply blocking activator function.\",\n      \"evidence\": \"Co-immunoprecipitation, ChIP at the Rad promoter in Schwann cells, repression assays, and alternative splicing analysis\",\n      \"pmids\": [\"16574654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CHD3 vs CHD4 recruitment differs functionally\", \"Full composition of the NAB2-associated repressive complex not defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery that NAB2 can act as a coactivator of EGR1 at the IL-2 promoter in T cells revealed context-dependent dual functionality, challenging the view of NAB2 as a constitutive repressor.\",\n      \"evidence\": \"Overexpression, siRNA knockdown, ChIP at IL-2 promoter, and cytokine measurement in T cells\",\n      \"pmids\": [\"17142725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for the switch from corepressor to coactivator unknown\", \"Whether coactivation involves distinct cofactors or post-translational modifications not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating that Nab2 knockout mice exhibit increased dermal collagen accumulation, linked mechanistically to NuRD recruitment and histone deacetylation at COL1A2, provided the first in vivo genetic evidence that NAB2 is an endogenous anti-fibrotic factor.\",\n      \"evidence\": \"Nab2 knockout mouse, ChIP showing NuRD occupancy at COL1A2, collagen synthesis assays\",\n      \"pmids\": [\"19888474\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full spectrum of fibrotic target genes repressed by NAB2 in vivo not mapped\", \"Whether NAB2 loss phenocopies specific fibrotic diseases not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing that NAB2 represses TRAIL in CD8+ T cells to enable secondary expansion—rescuable by TRAIL blockade—established NAB2 as a regulator of adaptive immune memory through an epistatic mechanism.\",\n      \"evidence\": \"Retroviral overexpression, dominant-negative expression, TRAIL blockade rescue in CD8+ T cells\",\n      \"pmids\": [\"22128144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NAB2 regulation of TRAIL is direct or via intermediate EGR targets at the chromatin level\", \"Relevance to infection models in vivo not shown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery of the NAB2-STAT6 gene fusion as the universal driver of solitary fibrous tumors fundamentally reframed NAB2's disease relevance, showing that fusion of its EGR-binding domain to the STAT6 transactivation domain converts NAB2 from a repressor to a nuclear transcriptional activator driving proliferation.\",\n      \"evidence\": \"Whole-exome/transcriptome sequencing of 51 SFTs, RT-PCR validation, overexpression in cultured cells, proximity ligation assay, and STAT6 IHC\",\n      \"pmids\": [\"23313952\", \"23575898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise mechanism by which the fusion activates rather than represses at EGR-bound sites\", \"Whether the fusion requires endogenous EGR1 or can function autonomously\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mapping the NAB2 nuclear localization signal to the KKXK343-346 motif resolved how NAB2 enters the nucleus and clarified why endogenous STAT6 (normally cytoplasmic) becomes nuclear when fused to NAB2.\",\n      \"evidence\": \"Site-directed mutagenesis, GFP fusion localization, domain transplantation to eIF2Bε\",\n      \"pmids\": [\"30411343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Import receptor that recognizes the KKXK motif not identified\", \"Whether NLS masking regulates NAB2 cytoplasmic retention under certain conditions\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Genome-wide chromatin profiling established that NAB2-STAT6 functions as a coactivator at EGR1-targeted enhancers and promoters, activating a neuronal/neuroendocrine gene signature and redirecting endogenous NAB1, NAB2, and EGR1 to the nucleus, resolving the transcriptional mechanism underlying SFT oncogenesis.\",\n      \"evidence\": \"Inducible cell model, primary SFT samples, ChIP-seq/ATAC-seq, transcriptomics\",\n      \"pmids\": [\"40875449\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the STAT6 transactivation domain overrides NuRD-mediated repression mechanistically\", \"Whether therapeutic disruption of the NAB2-STAT6–EGR1 interaction is feasible\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular basis for context-dependent switching between corepression and coactivation by wild-type NAB2, the identity of the nuclear import receptor recognizing KKXK, and the structural details of the NCD1–EGR R1 interaction remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of NAB2 or the NAB2–EGR complex\", \"Mechanism of coactivation at IL-2 and BCAR1 promoters not reconciled with NuRD-dependent repression\", \"Post-translational modifications regulating NAB2 function largely uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 3, 7, 8, 10, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 15, 16]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 2, 7, 8, 14]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 9, 20]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 13, 14]}\n    ],\n    \"complexes\": [\n      \"NuRD complex (via CHD4)\"\n    ],\n    \"partners\": [\n      \"EGR1\",\n      \"EGR2\",\n      \"EGR3\",\n      \"CHD4\",\n      \"CHD3\",\n      \"STAT6\",\n      \"WT1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}