{"gene":"NAB2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1996,"finding":"NAB2 (MADER) acts as a transcriptional corepressor that directly interacts with the R1 domain of NGFI-A (Egr-1) and Krox20 via its first conserved domain (NCD1), repressing transcriptional activation by both factors.","method":"Protein interaction mapping, transcriptional reporter assays, molecular cloning","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-level interaction mapping with transcriptional repression assays, foundational paper replicated by multiple subsequent studies","pmids":["8668170"],"is_preprint":false},{"year":1996,"finding":"NAB2 (MADER) is a delayed early response gene whose expression is induced by serum stimulation of fibroblasts and NGF stimulation of PC12 cells — the same stimuli that induce Egr-1 — consistent with a negative feedback role.","method":"Northern blot, expression kinetics analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, expression-level measurement, but replicated across multiple stimulus conditions in same study and corroborated by later work","pmids":["8668170"],"is_preprint":false},{"year":1997,"finding":"The Nab2 and Stat6 genes share a common transcription termination region on chromosome 12q13; an alternatively spliced form of Nab2 lacking exon 3 produces a protein that cannot repress NGFI-A or Krox20 transcription.","method":"Genomic sequencing, RT-PCR, transcriptional reporter assays","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct sequencing and functional assay in single lab demonstrating splice-isoform-dependent loss of repression function","pmids":["9126479"],"is_preprint":false},{"year":1998,"finding":"NAB2 overexpression in PC12 cells blocks NGF-induced neuronal differentiation, prevents growth arrest, and suppresses induction of delayed NGF response genes (TGF-β1, MMP-3) and p21(WAF1), without altering early MAP kinase activation or immediate-early gene induction.","method":"Stable transfection, transient transfection, adenoviral infection, immunoblot, growth assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — three independent experimental approaches (stable transfection, transient transfection, adenoviral infection) with specific molecular phenotype readouts in single study","pmids":["9722618"],"is_preprint":false},{"year":1999,"finding":"NAB2 is rapidly and transiently induced in vascular smooth muscle cells (VSMC) by PMA and in vivo mechanical arterial injury, at the protein and mRNA level, trailing Egr-1 induction, and NAB2 expression inhibits Egr-1-dependent gene expression in VSMC.","method":"Western blot, Northern blot, in vivo arterial injury model, transcriptional reporter assays","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo experiments, single lab, multiple readouts","pmids":["10514413"],"is_preprint":false},{"year":2001,"finding":"NAB2 blocks Egr-1-mediated activation of the tissue factor promoter and Egr-1-stimulated production of PDGF-AB, HGF, TGF-β1, and VEGF; a dominant-negative NAB2 mutant fails to abrogate Egr-1-driven promoter activity or tubule formation in an angiogenesis assay.","method":"Reporter gene assay, dominant-negative mutagenesis, ELISA, in vitro angiogenesis assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis used to dissect function, multiple gene targets assessed, single lab","pmids":["11327726"],"is_preprint":false},{"year":2002,"finding":"NAB2 completely blocks VEGF-induced tissue factor reporter gene activity, inhibits upregulation of tissue factor, VEGF receptor-1, and urokinase plasminogen activator mRNAs, and significantly reduces tubule/sprout formation and vessel-like structure invasion in angiogenesis assays when overexpressed via adenovirus in endothelial cells.","method":"Adenoviral overexpression, RT-PCR, reporter gene assay, in vitro and in vivo (Matrigel) angiogenesis assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal assays (reporter gene, mRNA analysis, in vitro angiogenesis, in vivo Matrigel) in single study","pmids":["12427750"],"is_preprint":false},{"year":2005,"finding":"Egr-1 directly activates the NAB2 promoter through a cluster of Egr/Sp1 binding sites (−329 to −260 bp), and NAB2 in turn represses its own promoter activity, establishing a negative feedback loop. Sp1 constitutively binds the promoter region while stimulation induces Egr-1 binding. Depletion of Egr-1 by siRNA reduces NAB2 expression and inducibility.","method":"Promoter cloning, EMSA, reporter gene assay, siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (EMSA, reporter assays, siRNA) demonstrate direct Egr-1 binding and functional consequence on NAB2 expression","pmids":["16260776"],"is_preprint":false},{"year":2006,"finding":"NAB2 represses transcription through at least two domains, one of which requires interaction with CHD4 (chromodomain helicase DNA-binding protein 4), a subunit of the NuRD nucleosome remodeling and deacetylase complex. Both NAB1 and NAB2 can bind CHD3 or CHD4. Repression of the endogenous Rad gene by NAB2 involves CHD4, and NAB2 and CHD4 colocalize on the Rad promoter in myelinating Schwann cells. Alternative splicing of NAB2 mRNA regulates the CHD4 interaction.","method":"Co-immunoprecipitation, GST pulldown, ChIP, mutagenesis, reporter gene assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reciprocal pulldown, ChIP demonstrating co-occupancy at endogenous promoter, mutagenesis to dissect repression domains, alternative splicing functional consequence","pmids":["16574654"],"is_preprint":false},{"year":2006,"finding":"NAB2 is induced by TCR engagement and costimulation, and acts as a coactivator of Egr-1 to enhance IL-2 transcription; NAB2 is recruited to the Egr-1 binding site of the IL-2 promoter as shown by ChIP, and siRNA to NAB2 markedly inhibits IL-2 expression.","method":"Overexpression, siRNA knockdown, ELISA, ChIP, reporter gene assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrates direct promoter occupancy, siRNA and overexpression with quantitative cytokine readout, multiple orthogonal methods","pmids":["17142725"],"is_preprint":false},{"year":2008,"finding":"TCR-induced Egr-1 and NAB2 enhance T cell function, while Egr-2 and Egr-3 suppress Egr-1 and NAB2 expression. Egr-3 is upstream of Egr-2 in this pathway. T cells from Egr-2/Egr-3 null mice are hyperresponsive; Egr-3 transgenic T cells are hyporesponsive, demonstrating opposing roles for NAB2/Egr-1 versus Egr-2/Egr-3 in T cell fate.","method":"Genetic knockout, transgenic overexpression, in vivo pneumonitis model, T cell functional assays","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via knockout and transgenic mice with in vivo phenotypic readout, single lab","pmids":["18203138"],"is_preprint":false},{"year":2009,"finding":"TGF-β induces NAB2 expression in normal fibroblasts; ectopic NAB2 expression blocks Egr-1-dependent transcriptional responses, abrogates TGF-β-induced collagen synthesis and myofibroblast differentiation, and involves recruitment of the NuRD complex to the COL1A2 promoter with reduced histone H4 acetylation. Nab2 knockout mice display increased dermal collagen accumulation.","method":"Ectopic overexpression, siRNA knockdown, reporter gene assay, ChIP, histone acetylation assay, Nab2 knockout mouse","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic knockout mouse phenotype + ChIP + multiple in vitro assays in single study, multiple orthogonal methods","pmids":["19888474"],"is_preprint":false},{"year":2010,"finding":"EGR1, EGR2, and EGR3 all activate NAB2 transcription in cells of neuroectodermal and epithelial origin via similar cis-regulatory elements; NAB2 in turn represses each EGR-induced promoter activity, establishing a conserved negative feedback loop. Depletion of EGR2 or EGR3 by siRNA reduces endogenous NAB2 levels.","method":"Overexpression, siRNA knockdown, reporter gene assay","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA functional validation and reporter assays, single lab, extends prior findings to EGR2/EGR3","pmids":["20506119"],"is_preprint":false},{"year":2011,"finding":"NAB2 is selectively induced in helped CD8+ T cells (by IL-2 signaling) and prevents TRAIL induction after restimulation; enforced NAB2 expression prevents TRAIL induction in helpless CD8+ T cells, while dominant-negative NAB2 impairs secondary proliferative response (reversible by TRAIL blockade), identifying NAB2 as a mediator of Th-dependent CD8+ T cell memory through TRAIL regulation.","method":"Retroviral overexpression, dominant-negative expression, TRAIL blockade, FACS, in vivo T cell response assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function and dominant-negative approaches with rescue experiment (TRAIL blockade), multiple orthogonal readouts in single study","pmids":["22128144"],"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 EGR1 binding to the BCAR1 5' region; p130(Cas) depletion reduces EGR1 and NAB2 expression in tamoxifen-sensitive cells, forming a positive feedback loop.","method":"Overexpression, siRNA knockdown, ChIP, RT-PCR, Western blot","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrates direct promoter occupancy, siRNA knockdowns confirm functional role, single lab","pmids":["22431919"],"is_preprint":false},{"year":2013,"finding":"Recurrent NAB2-STAT6 gene fusions are present in all solitary fibrous tumors tested (51/51 SFTs). The predicted fusion protein harbors the EGR-binding domain of NAB2 fused to the activation domain of STAT6. Overexpression of NAB2-STAT6 induces cell proliferation and activates EGR-responsive genes, converting a transcriptional repressor into a transcriptional activator.","method":"Whole-exome sequencing, transcriptome sequencing, RT-PCR, overexpression in cultured cells, gene expression analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — integrative sequencing plus functional validation (overexpression with proliferation and gene expression readouts) replicated across 51 tumors","pmids":["23313952"],"is_preprint":false},{"year":2013,"finding":"The NAB2-STAT6 fusion protein causes nuclear relocalization of STAT6 protein (which is normally cytoplasmic), detectable by immunohistochemistry and proximity ligation assay; tissues lacking the fusion show nuclear NAB2 and cytoplasmic STAT6.","method":"Proximity ligation assay (Duolink), immunohistochemistry, exome sequencing","journal":"Acta neuropathologica","confidence":"High","confidence_rationale":"Tier 2 / Strong — proximity ligation assay detects fusion protein directly; IHC nuclear STAT6 validated in 35/37 meningeal HPC and 25/25 meningeal SFT vs. 0/87 meningiomas","pmids":["23575898"],"is_preprint":false},{"year":2013,"finding":"NAB2 is induced in NK cells by IL-2 and IL-15 and promotes TRAIL induction, while EGR-1 (induced by the same stimuli) acts as a brake on TRAIL expression in NK cells, establishing reciprocal NAB2/EGR-1 regulation of TRAIL.","method":"Overexpression, knockdown, FACS, TRAIL expression assays","journal":"Immunology letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional overexpression and knockdown with cytokine/expression readouts in NK cells, single lab","pmids":["23416169"],"is_preprint":false},{"year":2017,"finding":"WT1 (Wilms' tumor gene 1 protein) directly binds and transactivates the proximal NAB2 promoter; WT1 overexpression increases NAB2 levels while WT1 suppression decreases NAB2 expression in leukemic cells. WT1 recruits NAB2 to the IRF8 promoter, modulating WT1 transcriptional activity.","method":"ChIP, reporter gene assay, overexpression, siRNA knockdown, gene expression correlation","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assays demonstrate direct promoter binding and transactivation, with gain- and loss-of-function validation, single lab","pmids":["29152069"],"is_preprint":false},{"year":2018,"finding":"The NAB2 nuclear localization signal (NLS) maps to the KKXK (K343–K346) motif; mutation of KKXK to AAXA causes cytoplasmic localization of NAB2, while upstream K(X2)R mutations have no effect. Fusion of the KKXK motif to cytoplasmic eIF2Bε is sufficient for nuclear localization.","method":"Site-directed mutagenesis, fluorescence microscopy (localization assay), fusion protein construct","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis with localization readout, sufficiency shown by fusion protein, single lab","pmids":["30411343"],"is_preprint":false},{"year":2020,"finding":"NAB2-STAT6 fusion protein upregulates EGR-1 and the EGR-1 target gene IGF2, increases p-Rb (Ser795) and cyclin D1 levels, enhances cell proliferation, and promotes oncogenic progression in NIH-3T3 cells; IGF2 inhibitor treatment reduces proliferation in NAB2-STAT6-expressing cells.","method":"Transfection, Western blot, RT-PCR, cell proliferation assay, pharmacological inhibition","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple molecular readouts and pharmacological rescue, single lab, cell line model","pmids":["32216968"],"is_preprint":false},{"year":2025,"finding":"NAB2-STAT6 operates as a transcriptional coactivator for EGR1-targeted enhancers and promoters. In physiological conditions, NAB2 is primarily cytoplasmic with only a small nuclear fraction. NAB2-STAT6 redirects NAB1, NAB2, and EGR1 to the nucleus. The STAT6 moiety is the major driver of nuclear localization and enhances co-activating function. NAB2-STAT6 activates a neuroendocrine gene signature in primary SFT samples.","method":"Inducible cell model, ChIP-seq/ATAC-seq (enhancer/promoter mapping), primary tumor samples, subcellular fractionation, co-immunoprecipitation","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — inducible cell model + primary tumors + genomic occupancy mapping + fractionation with multiple orthogonal methods in single study","pmids":["40875449"],"is_preprint":false},{"year":2024,"finding":"NAB2-STAT6 fusion activates a neuroendocrine gene signature in SFTs; STAT6 moiety drives nuclear localization and co-activating function of the fusion protein (preprint version of peer-reviewed eLife paper above).","method":"Inducible cell model, primary tumor samples, genomic profiling","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — preprint version; findings superseded by peer-reviewed eLife publication; included for completeness","pmids":["38659891"],"is_preprint":true},{"year":2006,"finding":"FGF23 induces expression of two isoforms of NAB2 in kidney cells; both isoforms localize to the nucleus and suppress the transcriptional activity of Egr-1, suggesting a negative feedback loop in FGF23 signaling.","method":"RT-PCR, immunolocalization, reporter gene assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — nuclear localization confirmed by immunofluorescence, functional repression shown by reporter assay, single lab","pmids":["17174939"],"is_preprint":false},{"year":2023,"finding":"ASO treatment targeting NAB2-STAT6 fusion transcript caused 58% reduction in fusion transcript expression and 22% reduction in cell proliferation in vitro; AAV2-mediated CRISPR/CasRx led to 59% reduction in fusion transcript and 55% reduction in xenograft growth ex vivo, validating the fusion transcript as a therapeutic target.","method":"CRISPR/SpCas9 engineered cell models, antisense oligonucleotide treatment, AAV2-mediated CRISPR/CasRx, cell proliferation assay, xenograft model","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple RNA-targeting strategies with in vitro and ex vivo functional readouts, single lab","pmids":["37370737"],"is_preprint":false}],"current_model":"Human NAB2 (MADER) is a transcriptional coregulator that, in its wild-type form, acts primarily as a corepressor of EGR-family transcription factors (Egr-1/NGFI-A, Egr-2/Krox20, Egr-3) by binding their R1 domain via NCD1 and recruiting the NuRD chromatin remodeling complex (via CHD4) to target promoters, thereby limiting EGR-driven expression of mitogenic and fibrotic genes; NAB2 is itself induced by EGR1/2/3 and represses its own promoter, establishing a negative feedback loop, and can paradoxically act as a coactivator (e.g., at the IL-2 promoter in T cells, or in regulating TRAIL in immune cells); in solitary fibrous tumors, an intrachromosomal inversion on chromosome 12q13 generates the NAB2-STAT6 fusion protein, whose STAT6 transactivation domain overrides NAB2's repressor function, redirects NAB1, NAB2, and EGR1 to the nucleus, and converts the complex into a constitutive coactivator of EGR1-target enhancers—including a neuroendocrine gene program—thereby driving tumor cell proliferation."},"narrative":{"mechanistic_narrative":"NAB2 (MADER) is a transcriptional coregulator that governs the output of EGR-family transcription factors, functioning canonically as a corepressor that limits EGR-driven mitogenic and fibrotic gene programs [PMID:8668170, PMID:11327726]. It binds the R1 domain of NGFI-A (Egr-1) and Krox20 through its first conserved domain (NCD1) and represses their transcriptional activation [PMID:8668170], with repression depending in part on direct interaction with CHD4, a subunit of the NuRD nucleosome-remodeling and deacetylase complex, which NAB2 recruits to target promoters such as Rad and COL1A2 to reduce histone H4 acetylation [PMID:16574654, PMID:19888474]. NAB2 is itself a delayed early-response gene induced by EGR1/2/3 through Egr/Sp1 cis-elements and represses its own EGR-induced promoter, establishing a conserved negative feedback loop [PMID:16260776, PMID:20506119]; it is induced downstream of serum, NGF, TGF-β, mechanical arterial injury, and FGF23, in each case curbing EGR-1–dependent responses including neuronal differentiation, collagen synthesis, myofibroblast differentiation, tissue factor expression, and angiogenesis [PMID:9722618, PMID:10514413, PMID:12427750, PMID:19888474, PMID:17174939]. In a context-dependent reversal, NAB2 acts as an EGR-1 coactivator at the IL-2 promoter in T cells and participates in TRAIL and BCAR1/p130Cas regulation in immune and cancer cells [PMID:17142725, PMID:22128144, PMID:22431919]. Its activity is gated by nuclear import through a KKXK (K343–K346) nuclear localization signal [PMID:30411343]. In solitary fibrous tumors, a recurrent NAB2-STAT6 gene fusion joins the EGR-binding domain of NAB2 to the STAT6 transactivation domain, converting the repressor into a constitutive coactivator that redirects NAB1, NAB2, and EGR1 to the nucleus and drives an EGR1-target enhancer program—including a neuroendocrine signature and IGF2 induction—to promote tumor cell proliferation [PMID:23313952, PMID:40875449, PMID:32216968].","teleology":[{"year":1996,"claim":"Established the founding mechanism by identifying NAB2 as a direct corepressor of EGR factors and mapping the interaction to defined protein domains, defining how EGR transcriptional output is restrained.","evidence":"Interaction mapping and reporter assays showing NCD1 binding to the R1 domain of NGFI-A and Krox20 with repression; Northern blot showing serum/NGF induction","pmids":["8668170"],"confidence":"High","gaps":["Did not define the corepression machinery recruited downstream of binding","Negative feedback inferred from induction kinetics, not directly demonstrated at this stage"]},{"year":1997,"claim":"Showed that alternative splicing controls NAB2 function, since an exon-3-deleted isoform loses repression, and located NAB2 adjacent to STAT6 on 12q13 — a genomic juxtaposition later proving oncogenically relevant.","evidence":"Genomic sequencing, RT-PCR, and reporter assays of splice isoforms","pmids":["9126479"],"confidence":"Medium","gaps":["Functional importance of the 12q13 NAB2/STAT6 proximity not yet appreciated","Mechanism by which exon-3 loss abolishes repression not resolved"]},{"year":1998,"claim":"Demonstrated a cellular phenotype for NAB2 corepression by showing it blocks NGF-induced neuronal differentiation and growth arrest specifically through delayed response genes, placing NAB2 downstream of immediate-early signaling.","evidence":"Stable, transient, and adenoviral overexpression in PC12 cells with growth and gene-induction readouts","pmids":["9722618"],"confidence":"High","gaps":["Did not identify the chromatin machinery mediating delayed-gene repression","Endogenous loss-of-function not tested"]},{"year":1999,"claim":"Extended NAB2's corepressor role to the vasculature, showing injury- and PMA-induced NAB2 inhibits Egr-1-dependent transcription in smooth muscle, linking it to vascular injury responses.","evidence":"Western/Northern blot, in vivo arterial injury model, reporter assays in VSMC","pmids":["10514413"],"confidence":"Medium","gaps":["Causal contribution to neointima formation not established by loss-of-function","Target gene set incompletely defined"]},{"year":2001,"claim":"Mapped NAB2's anti-mitogenic/anti-fibrotic reach by showing it blocks Egr-1 induction of tissue factor and multiple growth factors, and that a dominant-negative mutant defines functional domains required for repression.","evidence":"Reporter assays, dominant-negative mutagenesis, ELISA, in vitro angiogenesis assay","pmids":["11327726"],"confidence":"Medium","gaps":["Direct promoter occupancy not shown for most targets","Single-lab observation"]},{"year":2002,"claim":"Showed NAB2 functionally suppresses angiogenesis by blocking VEGF-induced tissue factor and proangiogenic gene programs, broadening its physiological role to vessel formation.","evidence":"Adenoviral overexpression, RT-PCR, reporter assays, in vitro and in vivo Matrigel angiogenesis assays","pmids":["12427750"],"confidence":"High","gaps":["Endogenous NAB2 requirement in angiogenesis not tested by depletion","Chromatin mechanism not addressed"]},{"year":2005,"claim":"Closed the regulatory circuit by showing Egr-1 directly activates the NAB2 promoter via Egr/Sp1 sites while NAB2 represses its own promoter, formally establishing the negative feedback loop.","evidence":"Promoter cloning, EMSA, reporter assays, siRNA knockdown","pmids":["16260776"],"confidence":"High","gaps":["Quantitative dynamics of the feedback loop not modeled","Did not address coactivator contexts"]},{"year":2006,"claim":"Identified the chromatin-modifying mechanism of NAB2 repression by showing it recruits CHD4 of the NuRD complex and co-occupies an endogenous target promoter, explaining how EGR-bound NAB2 silences transcription.","evidence":"Co-IP, GST pulldown, ChIP at the Rad promoter, mutagenesis, reporter assays in Schwann cells","pmids":["16574654"],"confidence":"High","gaps":["Whether NuRD recruitment is universal across all NAB2 targets not established","How splicing toggles the CHD4 interaction mechanistically unresolved"]},{"year":2006,"claim":"Revealed NAB2's context-dependent reversal to coactivation, showing it is recruited to the IL-2 promoter Egr-1 site and is required for IL-2 transcription in T cells, breaking the strict-corepressor view.","evidence":"Overexpression, siRNA, ELISA, ChIP, reporter assays in T cells","pmids":["17142725"],"confidence":"High","gaps":["Molecular switch determining repression versus activation not defined","Cofactors driving coactivation not identified"]},{"year":2006,"claim":"Showed FGF23 signaling induces nuclear NAB2 isoforms that suppress Egr-1, generalizing the feedback motif to renal FGF23 signaling.","evidence":"RT-PCR, immunolocalization, reporter assays in kidney cells","pmids":["17174939"],"confidence":"Medium","gaps":["Physiological consequence in vivo not tested","Single-lab expression-level observation"]},{"year":2008,"claim":"Placed NAB2 within an EGR regulatory hierarchy in T cells, showing Egr-1/NAB2 promote and Egr-2/Egr-3 suppress T cell responsiveness, defining opposing arms of an immune fate decision.","evidence":"Egr-2/Egr-3 knockout and Egr-3 transgenic mice, in vivo pneumonitis model, T cell functional assays","pmids":["18203138"],"confidence":"Medium","gaps":["Direct NAB2 loss-of-function in this circuit not isolated","Mechanism of Egr-2/3 suppression of NAB2 not detailed"]},{"year":2009,"claim":"Established NAB2 as an anti-fibrotic brake in vivo, showing TGF-β-induced NAB2 recruits NuRD to the COL1A2 promoter to limit collagen and myofibroblast differentiation, with Nab2-null mice accumulating dermal collagen.","evidence":"Overexpression, siRNA, ChIP, histone acetylation assay, Nab2 knockout mouse","pmids":["19888474"],"confidence":"High","gaps":["Whether fibrosis phenotype generalizes beyond skin not addressed","Relative contribution of NAB1 not parsed"]},{"year":2010,"claim":"Generalized the feedback architecture by showing all three EGR factors activate NAB2 and NAB2 represses each, confirming a conserved EGR-NAB2 autoregulatory loop across cell types.","evidence":"Overexpression, siRNA, reporter assays in neuroectodermal and epithelial cells","pmids":["20506119"],"confidence":"Medium","gaps":["Direct promoter binding for EGR2/EGR3 not shown here","Single-lab reporter-based evidence"]},{"year":2011,"claim":"Linked NAB2 coactivator function to immune memory, showing IL-2-induced NAB2 represses TRAIL to enable helped CD8+ T cell secondary responses, with dominant-negative NAB2 rescued by TRAIL blockade.","evidence":"Retroviral overexpression, dominant-negative, TRAIL blockade, FACS, in vivo T cell assays","pmids":["22128144"],"confidence":"High","gaps":["Direct TRAIL promoter occupancy by NAB2 not shown","Repressor versus activator role at TRAIL ambiguous across cell types"]},{"year":2012,"claim":"Identified a positive feedback role in cancer, showing EGR1 and NAB2 jointly upregulate p130Cas/BCAR1 in breast cancer with reciprocal reinforcement, again departing from pure corepression.","evidence":"Overexpression, siRNA, ChIP, RT-PCR, Western blot","pmids":["22431919"],"confidence":"Medium","gaps":["Mechanism converting NAB2 to coactivator at BCAR1 not defined","Single-lab cell-line study"]},{"year":2013,"claim":"Established NAB2 as an oncogenic driver by identifying recurrent NAB2-STAT6 fusions in essentially all solitary fibrous tumors, with the fusion converting the repressor into an EGR-target activator that drives proliferation.","evidence":"Whole-exome and transcriptome sequencing across 51 SFTs, RT-PCR, overexpression with proliferation and expression readouts","pmids":["23313952"],"confidence":"High","gaps":["Genome-wide enhancer targets of the fusion not mapped at this stage","Mechanism of repressor-to-activator conversion not yet detailed"]},{"year":2013,"claim":"Provided a diagnostic and mechanistic signature of the fusion by showing NAB2-STAT6 drives aberrant nuclear relocalization of normally cytoplasmic STAT6, detectable by PLA and IHC.","evidence":"Proximity ligation assay, immunohistochemistry, exome sequencing across meningeal SFT/HPC versus meningiomas","pmids":["23575898"],"confidence":"High","gaps":["Functional consequence of relocalization on transcription not directly assayed here","Did not address downstream gene program"]},{"year":2013,"claim":"Showed NAB2/EGR-1 reciprocally regulate TRAIL in NK cells, with NAB2 promoting and EGR-1 braking TRAIL induction, refining the context-dependence of the NAB2-EGR axis.","evidence":"Overexpression, knockdown, FACS, TRAIL expression assays in NK cells","pmids":["23416169"],"confidence":"Medium","gaps":["Direct promoter occupancy not shown","Opposite directionality of TRAIL regulation versus CD8+ T cells unexplained"]},{"year":2017,"claim":"Identified WT1 as an upstream activator that both induces NAB2 and recruits it to the IRF8 promoter, expanding NAB2's coregulator partnerships beyond EGR factors.","evidence":"ChIP, reporter assays, overexpression, siRNA in leukemic cells","pmids":["29152069"],"confidence":"Medium","gaps":["Whether NAB2 represses or activates WT1 targets context-dependent","NuRD involvement in WT1-NAB2 complexes not tested"]},{"year":2018,"claim":"Defined the molecular basis of NAB2 nuclear access by mapping its NLS to the KKXK (K343–K346) motif, which is necessary and sufficient for nuclear localization — a control point later exploited by the STAT6 fusion.","evidence":"Site-directed mutagenesis, fluorescence localization, fusion-protein sufficiency test","pmids":["30411343"],"confidence":"Medium","gaps":["Import receptors recognizing KKXK not identified","Regulation of NLS usage under signaling not addressed"]},{"year":2020,"claim":"Defined a proliferative effector axis of the fusion by showing NAB2-STAT6 upregulates EGR-1 and IGF2 and drives cell-cycle entry, with IGF2 inhibition reducing proliferation.","evidence":"Transfection, Western blot, RT-PCR, proliferation assay, pharmacological IGF2 inhibition in NIH-3T3 cells","pmids":["32216968"],"confidence":"Medium","gaps":["IGF2 dependence shown in fibroblast model, not primary SFT","Full enhancer program not mapped"]},{"year":2023,"claim":"Validated the fusion transcript as a therapeutic target by showing ASO and CRISPR/CasRx knockdown reduce fusion expression, proliferation, and xenograft growth.","evidence":"Engineered cell models, ASO, AAV2-CRISPR/CasRx, proliferation and xenograft assays","pmids":["37370737"],"confidence":"Medium","gaps":["Modest proliferation reduction relative to transcript knockdown","In vivo therapeutic efficacy not established"]},{"year":2025,"claim":"Provided the integrated mechanistic model of oncogenesis, showing NAB2-STAT6 acts as an EGR1-enhancer coactivator that redirects NAB1/NAB2/EGR1 to the nucleus via the STAT6 moiety and activates a neuroendocrine gene program.","evidence":"Inducible cell model, ChIP-seq/ATAC-seq, primary SFT samples, subcellular fractionation, co-IP","pmids":["40875449"],"confidence":"High","gaps":["How STAT6 transactivation domain overrides NuRD-based repression at the chromatin level not fully resolved","Therapeutic targeting of the activated program not addressed"]},{"year":null,"claim":"The molecular switch that determines whether wild-type NAB2 represses (via NuRD/CHD4) or coactivates EGR-targeted genes in a given cellular context remains undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural or biochemical basis for context-dependent corepressor/coactivator switching","Signaling inputs and post-translational marks that toggle NAB2 function not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,8,9,15,21]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[8,11]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[16,19,21,23]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[19,21]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,7,8]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[8,11]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[15,16,21]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,13,17]}],"complexes":["NuRD complex"],"partners":["EGR1","EGR2","EGR3","CHD4","CHD3","STAT6","WT1","NAB1"],"other_free_text":[]}},"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. 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gene.","date":"2015","source":"Anticancer research","url":"https://pubmed.ncbi.nlm.nih.gov/25667482","citation_count":11,"is_preprint":false},{"pmid":"37458420","id":"PMC_37458420","title":"The Drosophila Nab2 RNA binding protein inhibits m6A methylation and male-specific splicing of Sex lethal transcript in female neuronal tissue.","date":"2023","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/37458420","citation_count":10,"is_preprint":false},{"pmid":"36849419","id":"PMC_36849419","title":"Inducible CRISPR Epigenome Systems Mimic Cocaine Induced Bidirectional Regulation of Nab2 and Egr3.","date":"2023","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/36849419","citation_count":10,"is_preprint":false},{"pmid":"33887215","id":"PMC_33887215","title":"Lipomatous Solitary Fibrous Tumors Harbor Rare NAB2-STAT6 Fusion Variants and Show Up-Regulation of the Gene PPARG, Encoding for a Regulator of Adipocyte Differentiation.","date":"2021","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/33887215","citation_count":10,"is_preprint":false},{"pmid":"22806638","id":"PMC_22806638","title":"The transcriptional regulator NAB2 reveals a two-step induction of TRAIL in activated plasmacytoid DCs.","date":"2012","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/22806638","citation_count":10,"is_preprint":false},{"pmid":"33002012","id":"PMC_33002012","title":"Dbp5 associates with RNA-bound Mex67 and Nab2 and its localization at the nuclear pore complex is sufficient for mRNP export and cell viability.","date":"2020","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33002012","citation_count":9,"is_preprint":false},{"pmid":"37370737","id":"PMC_37370737","title":"Reduction of Tumor Growth with RNA-Targeting Treatment of the NAB2-STAT6 Fusion Transcript in Solitary Fibrous Tumor 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pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26817999","citation_count":8,"is_preprint":false},{"pmid":"23475888","id":"PMC_23475888","title":"NAB2-STAT6 fusions are a hallmark of solitary fibrous tumors.","date":"2013","source":"Cancer discovery","url":"https://pubmed.ncbi.nlm.nih.gov/23475888","citation_count":8,"is_preprint":false},{"pmid":"28968297","id":"PMC_28968297","title":"Solitary Fibrous Tumor of the Vulva: Report of 2 Cases, Including a De Novo Dedifferentiated Solitary Fibrous Tumor Diagnosed After Molecular Demonstration of NAB2-STAT6 Gene Fusion.","date":"2018","source":"International journal of gynecological pathology : official journal of the International Society of Gynecological Pathologists","url":"https://pubmed.ncbi.nlm.nih.gov/28968297","citation_count":8,"is_preprint":false},{"pmid":"34139237","id":"PMC_34139237","title":"The RNA-binding protein Nab2 regulates the proteome of the developing Drosophila brain.","date":"2021","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34139237","citation_count":7,"is_preprint":false},{"pmid":"34818026","id":"PMC_34818026","title":"Determination of biological behavior of solitary fibrous tumors: correlation of expression of Ki-67, TPX2 and TERT mRNA subunit level and NAB2-STAT6 fusion compared to morphological aspects of SFTs.","date":"2021","source":"Neoplasma","url":"https://pubmed.ncbi.nlm.nih.gov/34818026","citation_count":7,"is_preprint":false},{"pmid":"34075396","id":"PMC_34075396","title":"NAB2-STAT6 Gene Fusions to Evaluate Primary/Metastasis of Hemangiopericytoma/Solitary Fibrous Tumors.","date":"2021","source":"American journal of clinical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/34075396","citation_count":7,"is_preprint":false},{"pmid":"26425382","id":"PMC_26425382","title":"Importance of NAB2-STAT6 Fusion in the Diagnosis of Pancreatic Solitary Fibrous Tumor with Hamartoma-Like Features: A Case Report and Review of the Literature.","date":"2015","source":"Case reports in pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26425382","citation_count":7,"is_preprint":false},{"pmid":"35471546","id":"PMC_35471546","title":"The Nab2 RNA-binding protein patterns dendritic and axonal projections through a planar cell polarity-sensitive mechanism.","date":"2022","source":"G3 (Bethesda, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/35471546","citation_count":6,"is_preprint":false},{"pmid":"34604117","id":"PMC_34604117","title":"Roles and Cellular Localization of GBP2 and NAB2 During the Blood Stage of Malaria Parasites.","date":"2021","source":"Frontiers in cellular and infection microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/34604117","citation_count":6,"is_preprint":false},{"pmid":"35758200","id":"PMC_35758200","title":"Pancreatic hamartoma: detection of harbouring NAB2::STAT6 fusion gene.","date":"2022","source":"Histopathology","url":"https://pubmed.ncbi.nlm.nih.gov/35758200","citation_count":6,"is_preprint":false},{"pmid":"36056239","id":"PMC_36056239","title":"Analysis of clinicopathological features and NAB2-STAT6 fusion variants of meningeal solitary fibrous tumor with ectopic salivary gland components in the cerebellopontine angle.","date":"2022","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/36056239","citation_count":6,"is_preprint":false},{"pmid":"29464024","id":"PMC_29464024","title":"NAB2 is a novel immune stimulator of MDA-5 that promotes a strong type I interferon response.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/29464024","citation_count":6,"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":"33628684","id":"PMC_33628684","title":"Management of Polymicrobial Cierny-Mader Grade 3 and 4 Chronic Osteomyelitis of the Femur.","date":"2021","source":"Cureus","url":"https://pubmed.ncbi.nlm.nih.gov/33628684","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":"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":"38659891","id":"PMC_38659891","title":"NAB2-STAT6 drives an EGR1-dependent neuroendocrine program in Solitary Fibrous Tumors.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/38659891","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},{"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}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51516,"output_tokens":6016,"usd":0.122394,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14680,"output_tokens":6549,"usd":0.118563,"stage2_stop_reason":"end_turn"},"total_usd":0.240957,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"NAB2 (MADER) acts as a transcriptional corepressor that directly interacts with the R1 domain of NGFI-A (Egr-1) and Krox20 via its first conserved domain (NCD1), repressing transcriptional activation by both factors.\",\n      \"method\": \"Protein interaction mapping, transcriptional reporter assays, molecular cloning\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-level interaction mapping with transcriptional repression assays, foundational paper replicated by multiple subsequent studies\",\n      \"pmids\": [\"8668170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"NAB2 (MADER) is a delayed early response gene whose expression is induced by serum stimulation of fibroblasts and NGF stimulation of PC12 cells — the same stimuli that induce Egr-1 — consistent with a negative feedback role.\",\n      \"method\": \"Northern blot, expression kinetics analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, expression-level measurement, but replicated across multiple stimulus conditions in same study and corroborated by later work\",\n      \"pmids\": [\"8668170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The Nab2 and Stat6 genes share a common transcription termination region on chromosome 12q13; an alternatively spliced form of Nab2 lacking exon 3 produces a protein that cannot repress NGFI-A or Krox20 transcription.\",\n      \"method\": \"Genomic sequencing, RT-PCR, transcriptional reporter assays\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct sequencing and functional assay in single lab demonstrating splice-isoform-dependent loss of repression function\",\n      \"pmids\": [\"9126479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"NAB2 overexpression in PC12 cells blocks NGF-induced neuronal differentiation, prevents growth arrest, and suppresses induction of delayed NGF response genes (TGF-β1, MMP-3) and p21(WAF1), without altering early MAP kinase activation or immediate-early gene induction.\",\n      \"method\": \"Stable transfection, transient transfection, adenoviral infection, immunoblot, growth assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three independent experimental approaches (stable transfection, transient transfection, adenoviral infection) with specific molecular phenotype readouts in single study\",\n      \"pmids\": [\"9722618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"NAB2 is rapidly and transiently induced in vascular smooth muscle cells (VSMC) by PMA and in vivo mechanical arterial injury, at the protein and mRNA level, trailing Egr-1 induction, and NAB2 expression inhibits Egr-1-dependent gene expression in VSMC.\",\n      \"method\": \"Western blot, Northern blot, in vivo arterial injury model, transcriptional reporter assays\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo experiments, single lab, multiple readouts\",\n      \"pmids\": [\"10514413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NAB2 blocks Egr-1-mediated activation of the tissue factor promoter and Egr-1-stimulated production of PDGF-AB, HGF, TGF-β1, and VEGF; a dominant-negative NAB2 mutant fails to abrogate Egr-1-driven promoter activity or tubule formation in an angiogenesis assay.\",\n      \"method\": \"Reporter gene assay, dominant-negative mutagenesis, ELISA, in vitro angiogenesis assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis used to dissect function, multiple gene targets assessed, single lab\",\n      \"pmids\": [\"11327726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NAB2 completely blocks VEGF-induced tissue factor reporter gene activity, inhibits upregulation of tissue factor, VEGF receptor-1, and urokinase plasminogen activator mRNAs, and significantly reduces tubule/sprout formation and vessel-like structure invasion in angiogenesis assays when overexpressed via adenovirus in endothelial cells.\",\n      \"method\": \"Adenoviral overexpression, RT-PCR, reporter gene assay, in vitro and in vivo (Matrigel) angiogenesis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal assays (reporter gene, mRNA analysis, in vitro angiogenesis, in vivo Matrigel) in single study\",\n      \"pmids\": [\"12427750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Egr-1 directly activates the NAB2 promoter through a cluster of Egr/Sp1 binding sites (−329 to −260 bp), and NAB2 in turn represses its own promoter activity, establishing a negative feedback loop. Sp1 constitutively binds the promoter region while stimulation induces Egr-1 binding. Depletion of Egr-1 by siRNA reduces NAB2 expression and inducibility.\",\n      \"method\": \"Promoter cloning, EMSA, reporter gene assay, siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (EMSA, reporter assays, siRNA) demonstrate direct Egr-1 binding and functional consequence on NAB2 expression\",\n      \"pmids\": [\"16260776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NAB2 represses transcription through at least two domains, one of which requires interaction with CHD4 (chromodomain helicase DNA-binding protein 4), a subunit of the NuRD nucleosome remodeling and deacetylase complex. Both NAB1 and NAB2 can bind CHD3 or CHD4. Repression of the endogenous Rad gene by NAB2 involves CHD4, and NAB2 and CHD4 colocalize on the Rad promoter in myelinating Schwann cells. Alternative splicing of NAB2 mRNA regulates the CHD4 interaction.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, ChIP, mutagenesis, reporter gene assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reciprocal pulldown, ChIP demonstrating co-occupancy at endogenous promoter, mutagenesis to dissect repression domains, alternative splicing functional consequence\",\n      \"pmids\": [\"16574654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NAB2 is induced by TCR engagement and costimulation, and acts as a coactivator of Egr-1 to enhance IL-2 transcription; NAB2 is recruited to the Egr-1 binding site of the IL-2 promoter as shown by ChIP, and siRNA to NAB2 markedly inhibits IL-2 expression.\",\n      \"method\": \"Overexpression, siRNA knockdown, ELISA, ChIP, reporter gene assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrates direct promoter occupancy, siRNA and overexpression with quantitative cytokine readout, multiple orthogonal methods\",\n      \"pmids\": [\"17142725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TCR-induced Egr-1 and NAB2 enhance T cell function, while Egr-2 and Egr-3 suppress Egr-1 and NAB2 expression. Egr-3 is upstream of Egr-2 in this pathway. T cells from Egr-2/Egr-3 null mice are hyperresponsive; Egr-3 transgenic T cells are hyporesponsive, demonstrating opposing roles for NAB2/Egr-1 versus Egr-2/Egr-3 in T cell fate.\",\n      \"method\": \"Genetic knockout, transgenic overexpression, in vivo pneumonitis model, T cell functional assays\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via knockout and transgenic mice with in vivo phenotypic readout, single lab\",\n      \"pmids\": [\"18203138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TGF-β induces NAB2 expression in normal fibroblasts; ectopic NAB2 expression blocks Egr-1-dependent transcriptional responses, abrogates TGF-β-induced collagen synthesis and myofibroblast differentiation, and involves recruitment of the NuRD complex to the COL1A2 promoter with reduced histone H4 acetylation. Nab2 knockout mice display increased dermal collagen accumulation.\",\n      \"method\": \"Ectopic overexpression, siRNA knockdown, reporter gene assay, ChIP, histone acetylation assay, Nab2 knockout mouse\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic knockout mouse phenotype + ChIP + multiple in vitro assays in single study, multiple orthogonal methods\",\n      \"pmids\": [\"19888474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"EGR1, EGR2, and EGR3 all activate NAB2 transcription in cells of neuroectodermal and epithelial origin via similar cis-regulatory elements; NAB2 in turn represses each EGR-induced promoter activity, establishing a conserved negative feedback loop. Depletion of EGR2 or EGR3 by siRNA reduces endogenous NAB2 levels.\",\n      \"method\": \"Overexpression, siRNA knockdown, reporter gene assay\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA functional validation and reporter assays, single lab, extends prior findings to EGR2/EGR3\",\n      \"pmids\": [\"20506119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NAB2 is selectively induced in helped CD8+ T cells (by IL-2 signaling) and prevents TRAIL induction after restimulation; enforced NAB2 expression prevents TRAIL induction in helpless CD8+ T cells, while dominant-negative NAB2 impairs secondary proliferative response (reversible by TRAIL blockade), identifying NAB2 as a mediator of Th-dependent CD8+ T cell memory through TRAIL regulation.\",\n      \"method\": \"Retroviral overexpression, dominant-negative expression, TRAIL blockade, FACS, in vivo T cell response assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function and dominant-negative approaches with rescue experiment (TRAIL blockade), multiple orthogonal readouts in single study\",\n      \"pmids\": [\"22128144\"],\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 EGR1 binding to the BCAR1 5' region; p130(Cas) depletion reduces EGR1 and NAB2 expression in tamoxifen-sensitive cells, forming a positive feedback loop.\",\n      \"method\": \"Overexpression, siRNA knockdown, ChIP, RT-PCR, Western blot\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrates direct promoter occupancy, siRNA knockdowns confirm functional role, single lab\",\n      \"pmids\": [\"22431919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Recurrent NAB2-STAT6 gene fusions are present in all solitary fibrous tumors tested (51/51 SFTs). The predicted fusion protein harbors the EGR-binding domain of NAB2 fused to the activation domain of STAT6. Overexpression of NAB2-STAT6 induces cell proliferation and activates EGR-responsive genes, converting a transcriptional repressor into a transcriptional activator.\",\n      \"method\": \"Whole-exome sequencing, transcriptome sequencing, RT-PCR, overexpression in cultured cells, gene expression analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — integrative sequencing plus functional validation (overexpression with proliferation and gene expression readouts) replicated across 51 tumors\",\n      \"pmids\": [\"23313952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The NAB2-STAT6 fusion protein causes nuclear relocalization of STAT6 protein (which is normally cytoplasmic), detectable by immunohistochemistry and proximity ligation assay; tissues lacking the fusion show nuclear NAB2 and cytoplasmic STAT6.\",\n      \"method\": \"Proximity ligation assay (Duolink), immunohistochemistry, exome sequencing\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proximity ligation assay detects fusion protein directly; IHC nuclear STAT6 validated in 35/37 meningeal HPC and 25/25 meningeal SFT vs. 0/87 meningiomas\",\n      \"pmids\": [\"23575898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NAB2 is induced in NK cells by IL-2 and IL-15 and promotes TRAIL induction, while EGR-1 (induced by the same stimuli) acts as a brake on TRAIL expression in NK cells, establishing reciprocal NAB2/EGR-1 regulation of TRAIL.\",\n      \"method\": \"Overexpression, knockdown, FACS, TRAIL expression assays\",\n      \"journal\": \"Immunology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional overexpression and knockdown with cytokine/expression readouts in NK cells, single lab\",\n      \"pmids\": [\"23416169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"WT1 (Wilms' tumor gene 1 protein) directly binds and transactivates the proximal NAB2 promoter; WT1 overexpression increases NAB2 levels while WT1 suppression decreases NAB2 expression in leukemic cells. WT1 recruits NAB2 to the IRF8 promoter, modulating WT1 transcriptional activity.\",\n      \"method\": \"ChIP, reporter gene assay, overexpression, siRNA knockdown, gene expression correlation\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assays demonstrate direct promoter binding and transactivation, with gain- and loss-of-function validation, single lab\",\n      \"pmids\": [\"29152069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The NAB2 nuclear localization signal (NLS) maps to the KKXK (K343–K346) motif; mutation of KKXK to AAXA causes cytoplasmic localization of NAB2, while upstream K(X2)R mutations have no effect. Fusion of the KKXK motif to cytoplasmic eIF2Bε is sufficient for nuclear localization.\",\n      \"method\": \"Site-directed mutagenesis, fluorescence microscopy (localization assay), fusion protein construct\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis with localization readout, sufficiency shown by fusion protein, single lab\",\n      \"pmids\": [\"30411343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NAB2-STAT6 fusion protein upregulates EGR-1 and the EGR-1 target gene IGF2, increases p-Rb (Ser795) and cyclin D1 levels, enhances cell proliferation, and promotes oncogenic progression in NIH-3T3 cells; IGF2 inhibitor treatment reduces proliferation in NAB2-STAT6-expressing cells.\",\n      \"method\": \"Transfection, Western blot, RT-PCR, cell proliferation assay, pharmacological inhibition\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple molecular readouts and pharmacological rescue, single lab, cell line model\",\n      \"pmids\": [\"32216968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NAB2-STAT6 operates as a transcriptional coactivator for EGR1-targeted enhancers and promoters. In physiological conditions, NAB2 is primarily cytoplasmic with only a small nuclear fraction. NAB2-STAT6 redirects NAB1, NAB2, and EGR1 to the nucleus. The STAT6 moiety is the major driver of nuclear localization and enhances co-activating function. NAB2-STAT6 activates a neuroendocrine gene signature in primary SFT samples.\",\n      \"method\": \"Inducible cell model, ChIP-seq/ATAC-seq (enhancer/promoter mapping), primary tumor samples, subcellular fractionation, co-immunoprecipitation\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — inducible cell model + primary tumors + genomic occupancy mapping + fractionation with multiple orthogonal methods in single study\",\n      \"pmids\": [\"40875449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NAB2-STAT6 fusion activates a neuroendocrine gene signature in SFTs; STAT6 moiety drives nuclear localization and co-activating function of the fusion protein (preprint version of peer-reviewed eLife paper above).\",\n      \"method\": \"Inducible cell model, primary tumor samples, genomic profiling\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — preprint version; findings superseded by peer-reviewed eLife publication; included for completeness\",\n      \"pmids\": [\"38659891\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FGF23 induces expression of two isoforms of NAB2 in kidney cells; both isoforms localize to the nucleus and suppress the transcriptional activity of Egr-1, suggesting a negative feedback loop in FGF23 signaling.\",\n      \"method\": \"RT-PCR, immunolocalization, reporter gene assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — nuclear localization confirmed by immunofluorescence, functional repression shown by reporter assay, single lab\",\n      \"pmids\": [\"17174939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASO treatment targeting NAB2-STAT6 fusion transcript caused 58% reduction in fusion transcript expression and 22% reduction in cell proliferation in vitro; AAV2-mediated CRISPR/CasRx led to 59% reduction in fusion transcript and 55% reduction in xenograft growth ex vivo, validating the fusion transcript as a therapeutic target.\",\n      \"method\": \"CRISPR/SpCas9 engineered cell models, antisense oligonucleotide treatment, AAV2-mediated CRISPR/CasRx, cell proliferation assay, xenograft model\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple RNA-targeting strategies with in vitro and ex vivo functional readouts, single lab\",\n      \"pmids\": [\"37370737\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Human NAB2 (MADER) is a transcriptional coregulator that, in its wild-type form, acts primarily as a corepressor of EGR-family transcription factors (Egr-1/NGFI-A, Egr-2/Krox20, Egr-3) by binding their R1 domain via NCD1 and recruiting the NuRD chromatin remodeling complex (via CHD4) to target promoters, thereby limiting EGR-driven expression of mitogenic and fibrotic genes; NAB2 is itself induced by EGR1/2/3 and represses its own promoter, establishing a negative feedback loop, and can paradoxically act as a coactivator (e.g., at the IL-2 promoter in T cells, or in regulating TRAIL in immune cells); in solitary fibrous tumors, an intrachromosomal inversion on chromosome 12q13 generates the NAB2-STAT6 fusion protein, whose STAT6 transactivation domain overrides NAB2's repressor function, redirects NAB1, NAB2, and EGR1 to the nucleus, and converts the complex into a constitutive coactivator of EGR1-target enhancers—including a neuroendocrine gene program—thereby driving tumor cell proliferation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NAB2 (MADER) is a transcriptional coregulator that governs the output of EGR-family transcription factors, functioning canonically as a corepressor that limits EGR-driven mitogenic and fibrotic gene programs [#0, #5]. It binds the R1 domain of NGFI-A (Egr-1) and Krox20 through its first conserved domain (NCD1) and represses their transcriptional activation [#0], with repression depending in part on direct interaction with CHD4, a subunit of the NuRD nucleosome-remodeling and deacetylase complex, which NAB2 recruits to target promoters such as Rad and COL1A2 to reduce histone H4 acetylation [#8, #11]. NAB2 is itself a delayed early-response gene induced by EGR1/2/3 through Egr/Sp1 cis-elements and represses its own EGR-induced promoter, establishing a conserved negative feedback loop [#7, #12]; it is induced downstream of serum, NGF, TGF-\\u03b2, mechanical arterial injury, and FGF23, in each case curbing EGR-1\\u2013dependent responses including neuronal differentiation, collagen synthesis, myofibroblast differentiation, tissue factor expression, and angiogenesis [#3, #4, #6, #11, #23]. In a context-dependent reversal, NAB2 acts as an EGR-1 coactivator at the IL-2 promoter in T cells and participates in TRAIL and BCAR1/p130Cas regulation in immune and cancer cells [#9, #13, #14]. Its activity is gated by nuclear import through a KKXK (K343\\u2013K346) nuclear localization signal [#19]. In solitary fibrous tumors, a recurrent NAB2-STAT6 gene fusion joins the EGR-binding domain of NAB2 to the STAT6 transactivation domain, converting the repressor into a constitutive coactivator that redirects NAB1, NAB2, and EGR1 to the nucleus and drives an EGR1-target enhancer program\\u2014including a neuroendocrine signature and IGF2 induction\\u2014to promote tumor cell proliferation [#15, #21, #20].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established the founding mechanism by identifying NAB2 as a direct corepressor of EGR factors and mapping the interaction to defined protein domains, defining how EGR transcriptional output is restrained.\",\n      \"evidence\": \"Interaction mapping and reporter assays showing NCD1 binding to the R1 domain of NGFI-A and Krox20 with repression; Northern blot showing serum/NGF induction\",\n      \"pmids\": [\"8668170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the corepression machinery recruited downstream of binding\", \"Negative feedback inferred from induction kinetics, not directly demonstrated at this stage\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Showed that alternative splicing controls NAB2 function, since an exon-3-deleted isoform loses repression, and located NAB2 adjacent to STAT6 on 12q13 — a genomic juxtaposition later proving oncogenically relevant.\",\n      \"evidence\": \"Genomic sequencing, RT-PCR, and reporter assays of splice isoforms\",\n      \"pmids\": [\"9126479\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional importance of the 12q13 NAB2/STAT6 proximity not yet appreciated\", \"Mechanism by which exon-3 loss abolishes repression not resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated a cellular phenotype for NAB2 corepression by showing it blocks NGF-induced neuronal differentiation and growth arrest specifically through delayed response genes, placing NAB2 downstream of immediate-early signaling.\",\n      \"evidence\": \"Stable, transient, and adenoviral overexpression in PC12 cells with growth and gene-induction readouts\",\n      \"pmids\": [\"9722618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the chromatin machinery mediating delayed-gene repression\", \"Endogenous loss-of-function not tested\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Extended NAB2's corepressor role to the vasculature, showing injury- and PMA-induced NAB2 inhibits Egr-1-dependent transcription in smooth muscle, linking it to vascular injury responses.\",\n      \"evidence\": \"Western/Northern blot, in vivo arterial injury model, reporter assays in VSMC\",\n      \"pmids\": [\"10514413\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal contribution to neointima formation not established by loss-of-function\", \"Target gene set incompletely defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Mapped NAB2's anti-mitogenic/anti-fibrotic reach by showing it blocks Egr-1 induction of tissue factor and multiple growth factors, and that a dominant-negative mutant defines functional domains required for repression.\",\n      \"evidence\": \"Reporter assays, dominant-negative mutagenesis, ELISA, in vitro angiogenesis assay\",\n      \"pmids\": [\"11327726\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter occupancy not shown for most targets\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed NAB2 functionally suppresses angiogenesis by blocking VEGF-induced tissue factor and proangiogenic gene programs, broadening its physiological role to vessel formation.\",\n      \"evidence\": \"Adenoviral overexpression, RT-PCR, reporter assays, in vitro and in vivo Matrigel angiogenesis assays\",\n      \"pmids\": [\"12427750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous NAB2 requirement in angiogenesis not tested by depletion\", \"Chromatin mechanism not addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Closed the regulatory circuit by showing Egr-1 directly activates the NAB2 promoter via Egr/Sp1 sites while NAB2 represses its own promoter, formally establishing the negative feedback loop.\",\n      \"evidence\": \"Promoter cloning, EMSA, reporter assays, siRNA knockdown\",\n      \"pmids\": [\"16260776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative dynamics of the feedback loop not modeled\", \"Did not address coactivator contexts\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified the chromatin-modifying mechanism of NAB2 repression by showing it recruits CHD4 of the NuRD complex and co-occupies an endogenous target promoter, explaining how EGR-bound NAB2 silences transcription.\",\n      \"evidence\": \"Co-IP, GST pulldown, ChIP at the Rad promoter, mutagenesis, reporter assays in Schwann cells\",\n      \"pmids\": [\"16574654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NuRD recruitment is universal across all NAB2 targets not established\", \"How splicing toggles the CHD4 interaction mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed NAB2's context-dependent reversal to coactivation, showing it is recruited to the IL-2 promoter Egr-1 site and is required for IL-2 transcription in T cells, breaking the strict-corepressor view.\",\n      \"evidence\": \"Overexpression, siRNA, ELISA, ChIP, reporter assays in T cells\",\n      \"pmids\": [\"17142725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular switch determining repression versus activation not defined\", \"Cofactors driving coactivation not identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed FGF23 signaling induces nuclear NAB2 isoforms that suppress Egr-1, generalizing the feedback motif to renal FGF23 signaling.\",\n      \"evidence\": \"RT-PCR, immunolocalization, reporter assays in kidney cells\",\n      \"pmids\": [\"17174939\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological consequence in vivo not tested\", \"Single-lab expression-level observation\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placed NAB2 within an EGR regulatory hierarchy in T cells, showing Egr-1/NAB2 promote and Egr-2/Egr-3 suppress T cell responsiveness, defining opposing arms of an immune fate decision.\",\n      \"evidence\": \"Egr-2/Egr-3 knockout and Egr-3 transgenic mice, in vivo pneumonitis model, T cell functional assays\",\n      \"pmids\": [\"18203138\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct NAB2 loss-of-function in this circuit not isolated\", \"Mechanism of Egr-2/3 suppression of NAB2 not detailed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established NAB2 as an anti-fibrotic brake in vivo, showing TGF-\\u03b2-induced NAB2 recruits NuRD to the COL1A2 promoter to limit collagen and myofibroblast differentiation, with Nab2-null mice accumulating dermal collagen.\",\n      \"evidence\": \"Overexpression, siRNA, ChIP, histone acetylation assay, Nab2 knockout mouse\",\n      \"pmids\": [\"19888474\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether fibrosis phenotype generalizes beyond skin not addressed\", \"Relative contribution of NAB1 not parsed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Generalized the feedback architecture by showing all three EGR factors activate NAB2 and NAB2 represses each, confirming a conserved EGR-NAB2 autoregulatory loop across cell types.\",\n      \"evidence\": \"Overexpression, siRNA, reporter assays in neuroectodermal and epithelial cells\",\n      \"pmids\": [\"20506119\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter binding for EGR2/EGR3 not shown here\", \"Single-lab reporter-based evidence\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked NAB2 coactivator function to immune memory, showing IL-2-induced NAB2 represses TRAIL to enable helped CD8+ T cell secondary responses, with dominant-negative NAB2 rescued by TRAIL blockade.\",\n      \"evidence\": \"Retroviral overexpression, dominant-negative, TRAIL blockade, FACS, in vivo T cell assays\",\n      \"pmids\": [\"22128144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct TRAIL promoter occupancy by NAB2 not shown\", \"Repressor versus activator role at TRAIL ambiguous across cell types\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified a positive feedback role in cancer, showing EGR1 and NAB2 jointly upregulate p130Cas/BCAR1 in breast cancer with reciprocal reinforcement, again departing from pure corepression.\",\n      \"evidence\": \"Overexpression, siRNA, ChIP, RT-PCR, Western blot\",\n      \"pmids\": [\"22431919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism converting NAB2 to coactivator at BCAR1 not defined\", \"Single-lab cell-line study\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established NAB2 as an oncogenic driver by identifying recurrent NAB2-STAT6 fusions in essentially all solitary fibrous tumors, with the fusion converting the repressor into an EGR-target activator that drives proliferation.\",\n      \"evidence\": \"Whole-exome and transcriptome sequencing across 51 SFTs, RT-PCR, overexpression with proliferation and expression readouts\",\n      \"pmids\": [\"23313952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide enhancer targets of the fusion not mapped at this stage\", \"Mechanism of repressor-to-activator conversion not yet detailed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided a diagnostic and mechanistic signature of the fusion by showing NAB2-STAT6 drives aberrant nuclear relocalization of normally cytoplasmic STAT6, detectable by PLA and IHC.\",\n      \"evidence\": \"Proximity ligation assay, immunohistochemistry, exome sequencing across meningeal SFT/HPC versus meningiomas\",\n      \"pmids\": [\"23575898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of relocalization on transcription not directly assayed here\", \"Did not address downstream gene program\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed NAB2/EGR-1 reciprocally regulate TRAIL in NK cells, with NAB2 promoting and EGR-1 braking TRAIL induction, refining the context-dependence of the NAB2-EGR axis.\",\n      \"evidence\": \"Overexpression, knockdown, FACS, TRAIL expression assays in NK cells\",\n      \"pmids\": [\"23416169\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter occupancy not shown\", \"Opposite directionality of TRAIL regulation versus CD8+ T cells unexplained\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified WT1 as an upstream activator that both induces NAB2 and recruits it to the IRF8 promoter, expanding NAB2's coregulator partnerships beyond EGR factors.\",\n      \"evidence\": \"ChIP, reporter assays, overexpression, siRNA in leukemic cells\",\n      \"pmids\": [\"29152069\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NAB2 represses or activates WT1 targets context-dependent\", \"NuRD involvement in WT1-NAB2 complexes not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the molecular basis of NAB2 nuclear access by mapping its NLS to the KKXK (K343\\u2013K346) motif, which is necessary and sufficient for nuclear localization — a control point later exploited by the STAT6 fusion.\",\n      \"evidence\": \"Site-directed mutagenesis, fluorescence localization, fusion-protein sufficiency test\",\n      \"pmids\": [\"30411343\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Import receptors recognizing KKXK not identified\", \"Regulation of NLS usage under signaling not addressed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a proliferative effector axis of the fusion by showing NAB2-STAT6 upregulates EGR-1 and IGF2 and drives cell-cycle entry, with IGF2 inhibition reducing proliferation.\",\n      \"evidence\": \"Transfection, Western blot, RT-PCR, proliferation assay, pharmacological IGF2 inhibition in NIH-3T3 cells\",\n      \"pmids\": [\"32216968\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"IGF2 dependence shown in fibroblast model, not primary SFT\", \"Full enhancer program not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Validated the fusion transcript as a therapeutic target by showing ASO and CRISPR/CasRx knockdown reduce fusion expression, proliferation, and xenograft growth.\",\n      \"evidence\": \"Engineered cell models, ASO, AAV2-CRISPR/CasRx, proliferation and xenograft assays\",\n      \"pmids\": [\"37370737\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Modest proliferation reduction relative to transcript knockdown\", \"In vivo therapeutic efficacy not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided the integrated mechanistic model of oncogenesis, showing NAB2-STAT6 acts as an EGR1-enhancer coactivator that redirects NAB1/NAB2/EGR1 to the nucleus via the STAT6 moiety and activates a neuroendocrine gene program.\",\n      \"evidence\": \"Inducible cell model, ChIP-seq/ATAC-seq, primary SFT samples, subcellular fractionation, co-IP\",\n      \"pmids\": [\"40875449\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How STAT6 transactivation domain overrides NuRD-based repression at the chromatin level not fully resolved\", \"Therapeutic targeting of the activated program not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular switch that determines whether wild-type NAB2 represses (via NuRD/CHD4) or coactivates EGR-targeted genes in a given cellular context remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural or biochemical basis for context-dependent corepressor/coactivator switching\", \"Signaling inputs and post-translational marks that toggle NAB2 function not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 8, 9, 15, 21]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [8, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [16, 19, 21, 23]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [19, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 7, 8]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [8, 11]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [15, 16, 21]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 13, 17]}\n    ],\n    \"complexes\": [\"NuRD complex\"],\n    \"partners\": [\"EGR1\", \"EGR2\", \"EGR3\", \"CHD4\", \"CHD3\", \"STAT6\", \"WT1\", \"NAB1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}