{"gene":"EGR2","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1989,"finding":"EGR2/Krox-20 expression is induced by serum via a serum response element (SRE/CArG box) in its promoter that binds the same nuclear protein as the c-fos SRE, linking EGR2 to the immediate-early serum response gene network. Alternative splicing of the 5'-most intron produces proteins with different N-termini.","method":"Promoter deletion analysis, mutagenesis, gel-shift assays, Northern blot, genomic mapping","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro mutagenesis and transient transfection reporter assays with deletion series, replicated by functional SRE substitution","pmids":["2496302"],"is_preprint":false},{"year":1990,"finding":"The EGR2 promoter contains two CArG elements (CArG-1 and CArG-2); serum and PMA responsiveness maps specifically to CArG-1, and both protein kinase C-dependent and -independent pathways converge on this element to drive EGR2 transcription.","method":"Deletion analysis, mutagenesis, transient CAT reporter assays, S1 nuclease/primer extension","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — functional deletion series with mutagenesis in transient transfection, orthogonal pathway inhibitor experiments","pmids":["2111009"],"is_preprint":false},{"year":1993,"finding":"Krox20 protein directly binds three Krox20-binding sites in the HoxB2 r3/r5 enhancer (demonstrated in vitro) and is required in vivo for rhombomere-restricted HoxB2 expression; ectopic Krox20 can transactivate a HoxB2 r3/r5 enhancer reporter in transgenic mice, establishing Krox20 as a direct transcriptional activator of HoxB2 during hindbrain segmentation.","method":"In vitro binding/competition assays with bacterially expressed Krox20, transgenic reporter mice, ectopic expression","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding reconstituted with purified protein plus in vivo transgenic validation; replicated concept in multiple enhancers","pmids":["8093858"],"is_preprint":false},{"year":1993,"finding":"Targeted deletion of Krox20 (including the zinc-finger DNA-binding domain) in mice results in perinatal lethality with loss of rhombomeres 3 and 5, establishing an essential in vivo role for Krox20 in hindbrain segmentation.","method":"Gene targeting/knockout in mice, histological and neuroanatomical analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic loss-of-function with specific anatomical phenotype; widely replicated","pmids":["8224839"],"is_preprint":false},{"year":1995,"finding":"NAB1, identified by yeast two-hybrid, binds the R1 inhibitory domain of NGFI-A/Egr1 and represses transcriptional activation by both NGFI-A and Krox20/EGR2, but not Egr3 or NGFI-C, providing a mechanism for differential regulation within the EGR family.","method":"Yeast two-hybrid, transcriptional repression assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid interaction plus functional reporter assays, single lab","pmids":["7624335"],"is_preprint":false},{"year":1996,"finding":"NAB2, a second corepressor highly related to NAB1, interacts with the R1 domain of NGFI-A and represses transcriptional activity of both NGFI-A and Krox20/EGR2; NAB2 expression is induced by the same stimuli that activate NGFI-A, creating a feedback repression loop.","method":"Protein interaction assays, transcriptional reporter assays, expression analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — domain interaction mapping plus functional repression assays, single lab","pmids":["8668170"],"is_preprint":false},{"year":1996,"finding":"Krox-20 directly activates Hoxa-2 expression in rhombomeres 3 and 5: Krox20 protein binds two sites in the Hoxa-2 r3/r5 enhancer in vitro; mutation of these sites abolishes r3/r5 activity in transgenic mice; ectopic Krox20 in r4 transactivates the Hoxa-2/lacZ reporter, demonstrating direct transcriptional control of multiple group-2 Hox paralogs.","method":"In vitro binding/competition assays, transgenic analysis with lacZ reporters, mutational analysis, ectopic expression","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro binding with purified protein plus in vivo transgenic mutagenesis, multiple orthogonal approaches","pmids":["8625806"],"is_preprint":false},{"year":1999,"finding":"In Krox-20-null Schwann cells, SCIP expression is converted from transient to sustained, and both Schwann cell proliferation and apoptosis are markedly increased at postnatal stages, demonstrating that Krox20 controls SCIP expression, cell cycle exit, and susceptibility to apoptosis during Schwann cell development.","method":"Krox-20 knockout mouse analysis, immunohistochemistry, cell proliferation and apoptosis assays","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple specific cellular phenotype readouts replicated across developmental timepoints","pmids":["10068633"],"is_preprint":false},{"year":2001,"finding":"Krox20 is essential for specification of rhombomere identity: in Krox20-null embryos, r3 cells acquire r2/r4 identity and r5 cells acquire r6 identity; chimeric analysis shows r3/r5 mutant cells adopt even-numbered rhombomere mingling properties, demonstrating Krox20 couples segment formation, cell segregation, and regional identity specification.","method":"Genetic fate mapping, molecular marker analysis, embryonic chimeras","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic tools including chimeras, fate mapping, and molecular marker analysis","pmids":["11748134"],"is_preprint":false},{"year":2002,"finding":"Krox20 expression in Schwann cells is controlled by two axon-dependent cis-acting elements—an immature Schwann cell element (ISE) and a myelinating Schwann cell element (MSE, ~35 kb downstream)—acting in succession during development; the MSE requires the POU-domain factor Oct6 and contains multiple Oct6 binding sites, indicating Oct6 directly activates Krox20 transcription.","method":"Transgenic reporter analysis, in vivo nerve regeneration experiments, genetic epistasis with Oct6 mutants","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — transgenic analysis plus genetic epistasis, multiple orthogonal methods","pmids":["11782409"],"is_preprint":false},{"year":2002,"finding":"Krox20 synergizes with kreisler to activate Hoxb3 transcription via direct binding to the Hoxb3 r5 enhancer; Krox20 is required for enhancer activity specifically in r5 (the overlap domain of Krox20 and kreisler), demonstrating combinatorial transcriptional control.","method":"Genetic analysis (Krox20 mutant mice), mutational analysis of enhancer, ectopic expression, in vitro binding","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding plus in vivo transgenic mutagenesis plus genetic epistasis in multiple studies","pmids":["11823429"],"is_preprint":false},{"year":2003,"finding":"HCF-1 functions as a transcriptional coactivator for Krox20; Krox20 contains a functional HCF-binding motif in its N-terminal activation domain; mutation of this motif reduces both transactivation and association with the HCF-1 β-propeller domain; HCF-1's C-terminal activation domain contributes to Krox20-mediated activation, possibly through recruitment of p300.","method":"Coimmunoprecipitation, transcriptional reporter assays, mutagenesis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction mapping with mutagenesis plus functional reporter assays, single lab","pmids":["14532282"],"is_preprint":false},{"year":2003,"finding":"EGR2 directly transactivates BNIP3L and BAK expression as demonstrated by cDNA microarray and functional studies, inducing apoptosis through mitochondrial membrane permeability changes, cytochrome c release, and caspase-3, -8, and -9 activation downstream of the PTEN-EGR2 pathway.","method":"Adenovirus-mediated gene transfer, cDNA microarray, caspase activity assays, cytochrome c release assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays with OE plus microarray identification of direct targets, single lab","pmids":["12687019"],"is_preprint":false},{"year":2003,"finding":"Krox20 neural crest expression requires a cis-acting enhancer (NCE) 26 kb upstream containing two conserved Krox20-binding sites that mediate direct autoregulation, plus an HMG-box binding element responsive to Sox10; Sox10 synergizes with Krox20 to activate the NCE in vitro, and Sox10 inactivation prevents maintenance of Krox20 expression in migrating neural crest.","method":"Transgenic analysis with reporter constructs, mutagenesis of binding sites, in vitro transcription assays, Sox10 knockout analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of specific binding sites combined with transgenic validation and genetic epistasis","pmids":["12538520"],"is_preprint":false},{"year":2004,"finding":"Krox-20 cell-autonomously inactivates the JNK-c-Jun pathway in Schwann cells, thereby coordinately suppressing both neuregulin-1-induced proliferation and TGFβ/serum deprivation-induced death; Krox-20 also upregulates the JNK scaffold protein JIP-1, suggesting a mechanism for JNK regulation.","method":"Enforced Krox-20 expression in Schwann cells and fibroblasts, proliferation and apoptosis assays, JNK pathway activation assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function in multiple cell types with multiple pathway readouts, cell-autonomous demonstration","pmids":["14757751"],"is_preprint":false},{"year":2005,"finding":"EGR2/Egr2 directly binds a conserved element in the first intron of Myelin Protein Zero (Mpz) containing Egr2 binding sites; this element is transactivated by Egr2 and repressed by NAB corepressors; Egr2 binds this intron element in vivo (ChIP); Egr2 and Sox10 synergistically activate the element, while forskolin and IGF-1 induce Mpz in an Egr2-dependent manner.","method":"Chromatin immunoprecipitation (ChIP), transactivation reporter assays, mutagenesis, pharmacological inducers","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo ChIP plus mutagenesis plus transactivation assays, multiple orthogonal methods","pmids":["16373334"],"is_preprint":false},{"year":2005,"finding":"Egr2/Krox20 and SREBP transcription factors synergistically activate promoters of several cholesterol/lipid biosynthetic genes during myelination; Egr2 does not regulate SREBP pathway component levels but directly co-activates SREBP target gene promoters as part of the myelination program.","method":"Reporter assays, expression analysis during sciatic nerve development","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — reporter assays for synergistic activation plus developmental expression correlation, single lab","pmids":["15836632"],"is_preprint":false},{"year":2005,"finding":"Krox20 stimulates adipogenesis by transactivating the C/EBPβ promoter and increasing C/EBPβ expression in 3T3-L1 preadipocytes; RNAi knockdown of C/EBPβ diminishes the proadipogenic effect of Krox20; coexpression of Krox20 with C/EBPβ in naïve NIH3T3 cells induces a fully differentiated adipocyte phenotype.","method":"Overexpression, RNAi knockdown, reporter assays, adipogenesis assays in cell lines","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain- and loss-of-function with multiple orthogonal readouts, epistasis demonstrated","pmids":["16054051"],"is_preprint":false},{"year":2005,"finding":"Overexpression of Egr-2 and Egr-3 in T cells increases E3 ubiquitin ligase Cbl-b expression and inhibits T cell activation; Egr3-/- T cells have lower Cbl-b expression and are resistant to in vivo peptide-induced tolerance, identifying Egr2 and Egr3 as negative regulators of T cell activation that act through Cbl-b.","method":"Overexpression, knockout mice, in vivo tolerance assays, gene expression analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus OE with in vivo and in vitro readouts across multiple experimental conditions","pmids":["15834410"],"is_preprint":false},{"year":2006,"finding":"Krox20 expression in Schwann cells during the promyelin-myelin transition is directly activated by POU proteins Oct6 and Brn2 acting on the myelinating Schwann cell enhancer (MSE); synergism between POU proteins and Sox10 on this enhancer suggests Krox20 expression requires this combination of upstream factors, placing Krox20 downstream of Oct6/Brn2/Sox10 in the myelination transcription factor cascade.","method":"Cell culture transactivation assays, transgenesis, mutagenesis of binding sites","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell culture combined with transgenesis and mutagenesis, multiple factors tested","pmids":["16311519"],"is_preprint":false},{"year":2006,"finding":"Specific inactivation of Krox20 in adult Schwann cells results in severe demyelination with Schwann cell dedifferentiation and increased proliferation, demonstrating that Krox20 is required not only for onset of myelination but also for maintenance of the myelinating state in adult peripheral nerve.","method":"Conditional Krox20 knockout in adult mice, histological and ultrastructural analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with specific temporal and cell-type control, multiple phenotypic readouts","pmids":["16988048"],"is_preprint":false},{"year":2006,"finding":"In vivo ChIP assays in myelinating rat sciatic nerve demonstrate direct Egr2 binding to the Schwann cell enhancer of the myelin basic protein (MBP) gene, to a conserved site in the myelin-associated glycoprotein (MAG) gene, and to an intronic site in the Desert Hedgehog (Dhh) gene, establishing direct regulation of these targets.","method":"Chromatin immunoprecipitation (ChIP) in vivo in myelinating nerve","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo ChIP in native tissue with multiple target loci","pmids":["16923174"],"is_preprint":false},{"year":2006,"finding":"Three long-range (>200 kb) enhancer elements (A, B, C) control Krox20 transcription in the hindbrain; elements B and C function as initiators in r5 and r3-r5 respectively independent of Krox20 protein; element A contains Krox20-binding sites required for activity, establishing a direct positive autoregulatory loop; element B contains a vHNF1 binding site required for its activity, identifying vHNF1 as a direct initiator.","method":"Transgenic analysis with reporter constructs, enhancer knockout mice, mutagenesis of binding sites","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1 / Strong — enhancer knockout in mice combined with mutagenesis of specific transcription factor binding sites, multiple elements characterized","pmids":["16495311"],"is_preprint":false},{"year":2007,"finding":"Neuropathy-associated dominant EGR2 mutants disrupt EGR2/SOX10 synergy at the Mpz intron element: the mutants do not perturb EGR2 binding but attenuate SOX10 binding at both the Mpz intron and MAG gene elements (shown by ChIP), demonstrating that dominant EGR2 mutations cause peripheral neuropathy by antagonizing SOX10 binding at cooperative regulatory sites.","method":"Chromatin immunoprecipitation (ChIP), transcriptional reporter assays, mutagenesis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo ChIP with mutant proteins plus mutagenesis of binding sites, mechanistic explanation for dominant negative effect","pmids":["17325040"],"is_preprint":false},{"year":2008,"finding":"Egr2 directly represses genes (including Id2, Id4, and Rad) during myelination in conjunction with NAB corepressors: in vivo ChIP in myelinating sciatic nerve shows developmental association of both Egr2 and NAB2 on these promoters; NAB2 represses transcription by recruiting CHD4, a subunit of the NuRD chromatin remodeling complex; repression of Id2 augments Mpz activation.","method":"Chromatin immunoprecipitation (ChIP) in vivo, gene expression screen, epistasis experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo ChIP in native myelinating tissue demonstrating co-occupancy of Egr2 and NAB2, plus NuRD complex recruitment, multiple targets","pmids":["18456662"],"is_preprint":false},{"year":2008,"finding":"Krox20-null mutation of the Nab interaction domain (I268F) in mice causes severe hypomyelination mimicking congenital hypomyelinating neuropathy in humans; the Krox20-Nab interaction is required for regulation of most Krox20 target genes, but the molecular function of this interaction is target-dependent.","method":"Knock-in mouse model, immunohistochemical, ultrastructural, and expression analyses","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — precise knock-in mutagenesis with comprehensive phenotypic and molecular characterization","pmids":["18524893"],"is_preprint":false},{"year":2008,"finding":"Egr2 is required for sustained Bcl-2 upregulation during late stages of positive selection in the thymus; enforced Bcl-2 expression rescues T cell development in Egr2-/- thymocytes, placing Egr2 upstream of Bcl-2 in the survival pathway during positive selection.","method":"Egr2 knockout mice, gene expression analysis, Bcl-2 rescue experiments","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus rescue experiment establishing epistatic relationship","pmids":["19017967"],"is_preprint":false},{"year":2008,"finding":"Rostral Krox20 enhancer element C contains functional binding sites for Meis and Hox/Pbx factors that synergize to activate the enhancer; mutation of these sites shows that Krox20 is under direct transcriptional control of both Meis (presumably Meis2) and Hox/Pbx in r3; Hoxb1 binds to element C in vivo.","method":"In vivo ChIP, transgenic analysis with mutated enhancer constructs","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo ChIP plus transgenic enhancer mutagenesis with multiple transcription factors tested","pmids":["18787068"],"is_preprint":false},{"year":2008,"finding":"EGR2 and MeCP2 reciprocally regulate each other: ChIP shows EGR2 binding to the MECP2 promoter and MeCP2 binding to the EGR2 intron 1 enhancer; RNAi-mediated reduction of either EGR2 or MeCP2 reciprocally reduces the other's expression and protein levels.","method":"Chromatin immunoprecipitation, RNAi knockdown, quantitative expression analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ChIP plus reciprocal knockdown, single lab","pmids":["19000991"],"is_preprint":false},{"year":2009,"finding":"The HECT-type E3 ubiquitin ligase AIP2 interacts with EGR2 and promotes its ubiquitin-mediated proteasomal degradation; AIP2 suppresses EGR2-mediated FasL expression, thereby inhibiting activation-induced T-cell death; siRNA knockdown of AIP2 upregulates EGR2, inhibits EGR2 ubiquitination, and enhances T-cell apoptosis.","method":"Coimmunoprecipitation, ubiquitination assays, siRNA knockdown, apoptosis assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical interaction, ubiquitination assay, and loss-of-function with defined molecular and cellular readouts","pmids":["19651900"],"is_preprint":false},{"year":2010,"finding":"EGR1 and EGR2 directly bind the Col1a1 promoter tendon regulatory regions (shown by ChIP) and transactivate the mouse Col1a1 proximal promoter; FGF4 activates Egr gene expression and tendon collagen expression in chick limbs; Egr1 or Egr2 misexpression in chick induces de novo scleraxis, Col1a1, and other tendon collagen expression; Egr1/Egr2 mouse mutants show reduced Col1a1 transcripts and fewer collagen fibrils.","method":"Chromatin immunoprecipitation, reporter assays, gain-of-function in chick, knockout mouse analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo ChIP plus reporter assays plus gain-of-function in chick plus mouse KO, multiple orthogonal approaches","pmids":["21173153"],"is_preprint":false},{"year":2010,"finding":"EGR1 and EGR3 activate NAB2 transcription in melanoma and carcinoma cells through similar cis-regulatory elements, and EGR2 also induces NAB2 expression (less potently); NAB2 in turn represses each EGR's activity on the NAB2 promoter, establishing a negative feedback loop; siRNA reduction of EGR2 reduces endogenous NAB2 levels.","method":"Promoter reporter assays, siRNA knockdown, expression analysis","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — reporter assays plus siRNA, single lab","pmids":["20506119"],"is_preprint":false},{"year":2010,"finding":"Krox20/EGR2 haploinsufficiency accelerates growth and differentiation in preosteoclast cultures derived from splenocytes; Krox20 silencing increases cFms (M-CSFR) expression and response to M-CSF, leading to cell-autonomous stimulation of cell-cycle progression in preosteoclasts, resulting in increased bone resorption and low bone mass in vivo.","method":"Conditional KO/haploinsufficiency mice, preosteoclast cultures, siRNA, cell proliferation assays, microcomputed tomography","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic model plus cell-autonomous in vitro demonstration, single lab","pmids":["20716776"],"is_preprint":false},{"year":2011,"finding":"TGF-β induces EGR2 expression in fibroblasts via a Smad3-dependent mechanism; EGR2 overexpression is sufficient to stimulate collagen gene expression and myofibroblast differentiation; EGR2 depletion attenuates TGF-β profibrotic responses, establishing EGR2 as a necessary and sufficient mediator of TGF-β-induced fibrosis.","method":"Smad3-dependent reporter assays, overexpression, siRNA depletion, gene expression profiling","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with defined profibrotic phenotype, pathway placement via Smad3, single lab","pmids":["21514423"],"is_preprint":false},{"year":2012,"finding":"Egr2 binds the promoter of Zbtb16 (encoding PLZF) and the promoter of Il2rb (IL-2Rβ) in NKT precursors, directly activating their transcription (shown by ChIP-seq); higher and more prolonged Egr2 expression in NKT precursors specifies both early and late stages of NKT lineage differentiation.","method":"Chromatin immunoprecipitation followed by deep sequencing (ChIP-seq), conditional knockout analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide ChIP-seq with direct promoter binding plus genetic loss-of-function, multiple target genes validated","pmids":["22306690"],"is_preprint":false},{"year":2012,"finding":"Egr2 and Egr3 double-deficient B and T cells exhibit hyperactive STAT1 and STAT3 and severely impaired AP-1 activation; Egr2 and/or Egr3 directly induce expression of SOCS1 and SOCS3 (inhibitors of STAT1/3), and block the function of Batf (an AP-1 inhibitor), establishing these factors as regulators of cytokine signaling balance.","method":"Conditional double-knockout mice, reporter assays, gene expression analysis","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double-KO with defined molecular mechanism and direct target gene validation","pmids":["23021953"],"is_preprint":false},{"year":2012,"finding":"Genome-wide ChIP-seq of EGR2 and SOX10 in myelinating peripheral nerve identifies extensive co-binding at myelin gene regulatory regions; EGR2 represses a set of early developmental genes that SOX10 activates independently of EGR2, demonstrating coordinate and antagonistic gene regulation during myelination.","method":"ChIP-seq in vivo in myelinating nerve, integration with loss-of-function expression arrays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide in vivo ChIP-seq integrated with loss-of-function transcriptomic data","pmids":["22492709"],"is_preprint":false},{"year":2012,"finding":"Conditional Egr2 deletion in peripheral T cells abolishes induced expression of DGK-α and other anergy genes, and restores Ras/MAPK signaling, IL-2 production, and proliferation upon attempted anergy induction; Egr2 is necessary for anergy induction in vivo using superantigen- and tumor-induced models, establishing Egr2 as an essential transcriptional regulator of the T cell anergy program.","method":"Conditional Egr2 knockout mice, in vivo anergy induction models, gene expression analysis, signaling assays","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple in vivo and in vitro anergy models and molecular readouts","pmids":["23129747"],"is_preprint":false},{"year":2013,"finding":"Egr2 directly binds and controls expression of genes regulating proliferation (Myc and Myb) and differentiation repressors (Bcl6, Id3), while repressing transcription factors required for effector function (Zeb2, RORa, RORc, Bhlhe40); Egr2 and 3 expression is regulated reciprocally by antigen and IFNγ; sustained Egr2 expression enhances expansion but impairs effector differentiation.","method":"ChIP, conditional knockout mice, overexpression, gene expression analysis","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo ChIP plus gain- and loss-of-function with defined molecular targets across multiple T cell subsets","pmids":["28487311"],"is_preprint":false},{"year":2013,"finding":"Active Rac1 GTPase negatively regulates Schwann cell differentiation by upregulating c-jun and downregulating Krox20 through the MKK7-JNK pathway (not through Raf-ERK); ErbB2 signaling prevents MKK7 activation and c-jun induction; Rac inhibition blocks MKK7 activation and c-jun induction after axotomy.","method":"Primary Schwann cell cultures, Rac1 activation/inhibition, siRNA, kinase inhibitors, sciatic nerve axotomy model","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway dissection with multiple inhibitors and siRNA in primary cells plus in vivo nerve model, single lab","pmids":["23505039"],"is_preprint":false},{"year":2014,"finding":"EGR2 is a direct transcriptional regulator of Tbx21 and Notch1 (shown as direct target genes); EGR2 promotes peripheral naïve T-cell differentiation and is required for production of IFN-γ, IL-4, IL-9, and IL-17A, functioning as a positive regulator of naïve T-cell differentiation in contrast to its negative regulatory role in activated T cells.","method":"Conditional knockout mice, T-helper differentiation assays, direct target gene identification, viral infection model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with identification of direct target genes and multiple in vivo and in vitro phenotypic readouts","pmids":["25368162"],"is_preprint":false},{"year":2016,"finding":"Egr2 and Egr3 expressed in T cells cooperatively control TGF-β3 secretion from CD4+CD25-LAG3+ regulatory T cells by maintaining expression of Ltbp3 (latent TGF-β binding protein 3); T cell-specific Egr2/Egr3 double-KO mice develop lupus-like disease with complete loss of TGF-β3 production from LAG3+ cells, adoptive transfer of WT LAG3+ cells rescues the phenotype.","method":"T cell-specific double-knockout mice, adoptive transfer, cytokine analysis, gene expression","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double-KO plus adoptive transfer rescue, defined molecular mechanism via Ltbp3","pmids":["27911796"],"is_preprint":false},{"year":2017,"finding":"Egr2 and Egr3 physically interact with the T-box domain of T-bet, blocking T-bet DNA binding and inhibiting T-bet-mediated IFN-γ production; this interaction antagonizes Th1 differentiation.","method":"Co-immunoprecipitation, DNA binding assays, T cell differentiation assays, KO mice","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical protein-protein interaction plus functional DNA-binding inhibition assays plus genetic KO","pmids":["28455436"],"is_preprint":false},{"year":2017,"finding":"The lysine acetyltransferase GCN5 directly acetylates EGR2, positively regulating EGR2 transcriptional activity; GCN5 deficiency blocks iNKT cell development in a cell-intrinsic manner and specifically inhibits EGR2 target gene transcription (Runx1, PLZF, IL-2Rβ, T-bet) in iNKT cells.","method":"Acetyltransferase assay, conditional KO mice, reporter assays, gene expression analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical acetyltransferase assay identifying specific modification plus conditional KO with direct target gene analysis","pmids":["28723564"],"is_preprint":false},{"year":2017,"finding":"Egr2 binds and controls expression of Myc and Myb (proliferation genes) and differentiation repressors Bcl6 and Id3 while repressing Zeb2, RORa, RORc, and Bhlhe40; Egr2 and Egr3 operate as a checkpoint controlling the transition between clonal expansion and differentiation of effector T cells.","method":"ChIP, conditional DKO mice, OE, gene expression profiling","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo ChIP plus DKO and OE with defined molecular pathway placement","pmids":["28487311"],"is_preprint":false},{"year":2017,"finding":"Endogenous KLF4 and Krox20 are dispensable for adipogenesis in culture and brown adipose tissue development in mice (as shown by conditional knockout), contrary to overexpression studies, while PPARγ remains essential.","method":"Conditional knockout mice, primary preadipocyte cultures","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO in vivo and in vitro, negative finding about endogenous Krox20 requirement in adipogenesis","pmids":["27777310"],"is_preprint":false},{"year":2020,"finding":"CTCF establishes chromatin interaction loops between enhancer and promoter regulatory elements to promote EGR2 expression in Schwann cells; CTCF deletion blocks Schwann cell differentiation at the pro-myelinating stage while CTCF overexpression promotes myelination; CTCF also interacts with SUZ12 (PRC2 component) to repress genes negatively regulating Schwann cell maturation.","method":"CTCF conditional KO and OE, chromatin conformation capture, co-immunoprecipitation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO and OE with chromatin looping assays and Co-IP for CTCF-SUZ12 interaction","pmids":["32807777"],"is_preprint":false},{"year":2020,"finding":"EGR2 is a direct target of IL-4-activated STAT6 and acts as a molecular linchpin in alternative macrophage polarization; EGR2 binding results in chromatin opening and recruitment of chromatin remodelers and RNA polymerase II; EGR2 is required for 77% of the IL-4-induced gene signature including its own autoregulation and downstream PPARG induction; EGR2 interacts with the 5mC hydroxylase TET2 to initiate DNA demethylation at its binding sites.","method":"ChIP-seq, ATAC-seq, conditional KO, reporter assays, co-IP with TET2","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide chromatin profiling plus genetic KO plus biochemical TET2 interaction, multiple orthogonal methods","pmids":["33060136"],"is_preprint":false},{"year":2020,"finding":"Egr2 recruits the Rnf40-containing E3 ubiquitin ligase (responsible for histone H2B monoubiquitination) to its target genes in myelinating Schwann cells; Rnf40/H2Bub1 is required for selective high expression of myelin and lipid biosynthesis genes and proper repression of immaturity genes during peripheral nerve myelination.","method":"Conditional Rnf40 KO mice, ChIP-seq, RNA-seq, co-immunoprecipitation/recruitment assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — conditional KO combined with genome-wide ChIP-seq and RNA-seq, biochemical recruitment assay, multiple orthogonal approaches","pmids":["32672815"],"is_preprint":false},{"year":2021,"finding":"Chronic antigen exposure induces EGR2 selectively in progenitor exhausted CD8+ T cells; EGR2 enables terminal exhaustion and stabilizes the exhausted transcriptional state by direct EGR2-dependent control of exhaustion-associated genes and indirect maintenance of the exhausted epigenetic state.","method":"Conditional EGR2 deletion, chronic LCMV and tumor models, ATAC-seq, ChIP, transcriptomics","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in two in vivo models with integrated epigenomic and transcriptomic profiling","pmids":["33986293"],"is_preprint":false},{"year":2021,"finding":"EGR2 is an epigenetic pioneer in differentiating human monocytes: EGR2 binding results in active DNA demethylation at both stable and transient binding sites; EGR2 physically interacts with TET2 (5mC hydroxylase); EGR2 is essential for monocyte differentiation and DNA methylation turnover.","method":"Genome-wide methylation profiling, ATAC-seq, ChIP-seq, co-immunoprecipitation, EGR2 KD","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical TET2 interaction plus genome-wide epigenomic profiling plus functional KD, multiple orthogonal methods","pmids":["33692344"],"is_preprint":false},{"year":2021,"finding":"EGR2 directly binds and activates the ARF and p16 promoters to promote cellular senescence; EGR2 loss transiently reverses the senescent phenotype in human mammary epithelial cells and fibroblasts; EGR2 overexpression is sufficient to induce senescence, placing EGR2 as a direct transcriptional activator of the p16/pRB and ARF/p53/p21 pathways.","method":"ChIP, siRNA knockdown, overexpression, reporter assays, flow cytometry","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus gain- and loss-of-function, single lab","pmids":["33547862"],"is_preprint":false},{"year":2021,"finding":"Cell-intrinsic EGR2 is driven by TGF-β and GM-CSF in a PPAR-γ-dependent manner to control tissue-specific identity of alveolar macrophages; EGR2 is indispensable for repopulation of the alveolar niche after bleomycin-induced lung injury, and EGR2-dependent monocyte-derived alveolar macrophages are required for effective tissue repair.","method":"Conditional EGR2 KO mice, lung injury models, flow cytometry, gene expression","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with pathway placement (TGF-β/GM-CSF/PPARγ) and multiple in vivo functional readouts","pmids":["34797692"],"is_preprint":false},{"year":2021,"finding":"EGR2 transcription factor increases IGF2BP1/2/3 expression in renal cell carcinoma by directly binding IGF2BP promoters (validated by ChIP-qPCR and dual-luciferase reporter assays); IGF2BPs in turn regulate S1PR3 expression in an m6A-dependent manner by enhancing S1PR3 mRNA stability, promoting RCC tumorigenesis via the PI3K/AKT pathway.","method":"ChIP-qPCR, dual-luciferase reporter assays, RIP-qPCR, m6A assays, in vitro and in vivo functional assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assays plus functional xenograft, single lab","pmids":["34326314"],"is_preprint":false},{"year":2023,"finding":"EGR2 knockout in CAR T cells blocks type I interferon-mediated inhibitory programming induced by chronic antigen stimulation, expands early memory CAR T cells, and improves antitumor efficacy; EGR2 ablation suppresses dysfunction by inhibiting type I interferon signaling, and the protective effect is overridden by exogenous interferon-β, establishing an EGR2-type I interferon axis in CAR T cell exhaustion.","method":"CRISPR/Cas9 EGR2 KO in primary CAR T cells, gene expression profiling, in vivo tumor models, interferon pathway assays","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus interferon rescue experiment plus in vivo tumor models establishing mechanism","pmids":["37011008"],"is_preprint":false}],"current_model":"EGR2/Krox20 is a zinc-finger transcription factor that directly binds GC-rich DNA sequences via its three zinc fingers to activate or repress target genes in a context-dependent manner; it acts as a master regulator of peripheral nerve myelination (directly activating Mpz, MBP, MAG, Dhh, and lipid biosynthetic genes in concert with SOX10 while repressing Id2/Id4 via NAB-NuRD co-repressor complexes), controls hindbrain segmentation by directly activating HoxB2, HoxA2, and HoxB3 enhancers in r3/r5, governs T cell anergy and exhaustion through transcriptional programs that include Cbl-b, DGK-α, LAG-3, and 4-1BB, drives alternative macrophage polarization downstream of IL-4/STAT6 as an epigenetic pioneer that recruits TET2 for DNA demethylation and chromatin remodelers for gene activation, is subject to post-translational regulation by GCN5-mediated acetylation (enhancing its activity) and AIP2-mediated ubiquitination (targeting it for degradation), and is transcriptionally controlled upstream by FGF-MAPK/ERK signaling, Oct6/Brn2/Sox10, CTCF-mediated chromatin looping, and a direct positive autoregulatory loop."},"narrative":{"mechanistic_narrative":"EGR2 (Krox20) is a zinc-finger immediate-early transcription factor that binds defined GC-rich enhancer and promoter elements to orchestrate cell-fate decisions in the developing hindbrain, the peripheral nervous system, and the immune system, with its own transcription induced through serum/PMA-responsive CArG elements that link it to the immediate-early gene network [PMID:2496302, PMID:2111009]. In the hindbrain, EGR2 directly binds and transactivates rhombomere-3/5 enhancers of HoxB2, Hoxa2, and Hoxb3, often combinatorially with kreisler, and is genetically required for formation and identity specification of rhombomeres 3 and 5 [PMID:8093858, PMID:8625806, PMID:11823429, PMID:8224839, PMID:11748134]; its own expression in this domain is driven by long-range enhancers integrating vHNF1, Meis, and Hox/Pbx inputs together with a direct positive autoregulatory loop [PMID:16495311, PMID:18787068]. In Schwann cells, EGR2 is the master myelination regulator, directly occupying and activating myelin and lipid-biosynthetic gene loci including Mpz, MBP, MAG, and Dhh in cooperation with SOX10, while repressing immaturity genes such as Id2/Id4 [PMID:16373334, PMID:16923174, PMID:22492709, PMID:15836632, PMID:18456662]; it is required both to initiate and to maintain the myelinating state, and it enforces cell-cycle exit by inactivating the JNK/c-Jun pathway and converting SCIP from transient to sustained [PMID:16988048, PMID:10068633, PMID:14757751]. EGR2 transcription in Schwann cells is positioned downstream of the Oct6/Brn2/SOX10 cascade acting on the myelinating Schwann cell enhancer and of CTCF-mediated enhancer-promoter looping [PMID:11782409, PMID:16311519, PMID:32807777]. EGR2 represses targets by recruiting the NAB1/NAB2 corepressors, which in turn engage the CHD4/NuRD chromatin-remodeling complex, and activates targets by recruiting the Rnf40 H2B-monoubiquitination ligase [PMID:8668170, PMID:18456662, PMID:32672815]. In the immune system EGR2 controls T-cell anergy, NKT and effector differentiation, and the clonal expansion-to-differentiation checkpoint by directly regulating genes such as DGK-α, Cbl-b, Bcl-2, Zbtb16/PLZF, Il2rb, Myc, Myb, Bcl6, and Id3 and by physically sequestering T-bet to block Th1 differentiation [PMID:23129747, PMID:15834410, PMID:19017967, PMID:22306690, PMID:28487311, PMID:28455436], and it enables terminal CD8 T-cell and CAR-T exhaustion partly through a type I interferon axis [PMID:33986293, PMID:37011008]. Across myeloid lineages EGR2 acts as an epigenetic pioneer downstream of IL-4/STAT6, opening chromatin and recruiting TET2 to drive DNA demethylation during alternative macrophage and monocyte differentiation [PMID:33060136, PMID:33692344, PMID:34797692]. EGR2 activity is further tuned post-translationally by GCN5-mediated acetylation, which enhances its transcriptional output, and by AIP2-mediated ubiquitination, which targets it for proteasomal degradation [PMID:28723564, PMID:19651900]. Dominant EGR2 mutations cause peripheral neuropathy by attenuating SOX10 binding at cooperative myelin-gene regulatory sites, and disruption of the EGR2-NAB interaction causes congenital hypomyelinating neuropathy in mouse models [PMID:17325040, PMID:18524893].","teleology":[{"year":1989,"claim":"Established how EGR2 itself is induced, placing it within the immediate-early serum-response network rather than treating it only as a downstream effector.","evidence":"Promoter deletion/mutagenesis and gel-shift identifying a c-fos-like SRE/CArG element, refined to CArG-1 with PKC-dependent and -independent inputs","pmids":["2496302","2111009"],"confidence":"High","gaps":["Did not identify the downstream targets EGR2 regulates","Splice variants with distinct N-termini not functionally distinguished"]},{"year":1993,"claim":"Showed EGR2 is a direct, sequence-specific activator of segmentation genes and is genetically essential for hindbrain patterning, defining its first developmental program.","evidence":"In vitro binding to HoxB2 r3/r5 enhancer sites with transgenic reporter validation, plus zinc-finger-domain knockout producing loss of rhombomeres 3 and 5","pmids":["8093858","8224839"],"confidence":"High","gaps":["Cofactors mediating activation versus repression not yet defined","How segment-restricted EGR2 expression itself is established left open"]},{"year":1996,"claim":"Generalized EGR2 as a direct activator of multiple group-2 Hox enhancers and introduced NAB corepressors as a mechanism for differential, family-specific regulation of EGR activity.","evidence":"In vitro binding plus transgenic enhancer mutagenesis for Hoxa2; yeast two-hybrid and reporter assays defining NAB1/NAB2 binding to the EGR R1 inhibitory domain","pmids":["8625806","7624335","8668170"],"confidence":"High","gaps":["Molecular machinery recruited by NAB to repress was not yet known","NAB interaction studied for NGFI-A; EGR2-specific consequences not fully resolved"]},{"year":2002,"claim":"Defined the upstream cis-regulatory architecture and combinatorial cofactor logic that position EGR2 within both the hindbrain and Schwann-cell transcription cascades.","evidence":"Transgenic reporter analysis of Schwann-cell ISE/MSE elements requiring Oct6, and enhancer mutagenesis showing Krox20/kreisler synergy on the Hoxb3 r5 enhancer","pmids":["11782409","11823429"],"confidence":"High","gaps":["Direct biochemical contact between EGR2 and these upstream factors not all demonstrated","Temporal switching between ISE and MSE control not mechanistically resolved"]},{"year":2003,"claim":"Extended EGR2 function beyond development to cell-fate outcomes including apoptosis, adipogenesis, and neural-crest autoregulation, and identified coactivators that boost its transactivation.","evidence":"HCF-1 coactivator interaction mapping; microarray plus functional assays for BNIP3L/BAK apoptotic targets; transgenic NCE analysis showing SOX10 synergy and direct autoregulation","pmids":["14532282","12687019","12538520"],"confidence":"Medium","gaps":["HCF-1 and apoptotic-target findings from single labs without genetic confirmation","Physiological relevance of EGR2-driven apoptosis in vivo not established"]},{"year":2005,"claim":"Demonstrated EGR2 directly occupies myelin gene loci in native tissue and partners with SOX10 and SREBP, formalizing it as the transcriptional driver of the myelination program.","evidence":"In vivo ChIP at the Mpz intronic element with transactivation and SOX10 synergy assays, plus reporter assays for SREBP target co-activation","pmids":["16373334","16054051","15836632"],"confidence":"High","gaps":["Genome-wide binding repertoire not yet defined","Mechanism of EGR2-SOX10 cooperativity at chromatin not resolved"]},{"year":2005,"claim":"Opened EGR2's immunological role by identifying it as a negative regulator of T-cell activation and tolerance acting through Cbl-b.","evidence":"Overexpression and Egr3 knockout mice with in vivo peptide-tolerance assays and Cbl-b expression analysis","pmids":["15834410"],"confidence":"High","gaps":["Direct EGR2 binding to immune target promoters not yet shown","EGR2 versus EGR3 specific contributions not separated"]},{"year":2006,"claim":"Showed EGR2 is required to maintain, not merely initiate, the differentiated myelinating state and operates within a defined POU/SOX upstream cascade and antagonistic JNK signaling.","evidence":"Adult conditional Krox20 knockout causing demyelination; in vivo ChIP at MBP/MAG/Dhh; MSE transactivation by Oct6/Brn2; gain-of-function JNK pathway suppression","pmids":["16988048","16923174","16311519","14757751"],"confidence":"High","gaps":["How EGR2 mechanistically inactivates JNK beyond JIP-1 upregulation not fully resolved","Direct versus indirect maintenance targets not distinguished"]},{"year":2007,"claim":"Provided the mechanistic basis for dominant EGR2-linked peripheral neuropathy, showing pathogenic mutants poison SOX10 cooperativity rather than EGR2 DNA binding.","evidence":"ChIP and reporter assays with neuropathy-associated EGR2 mutants at Mpz and MAG cooperative elements","pmids":["17325040"],"confidence":"High","gaps":["Structural basis of EGR2-SOX10 interaction not determined","Genotype-phenotype correlation across mutation classes not addressed"]},{"year":2008,"claim":"Defined the molecular machinery of EGR2-mediated repression and proved the EGR2-NAB interaction is physiologically required, linking it to human hypomyelinating neuropathy.","evidence":"In vivo ChIP showing Egr2/NAB2 co-occupancy and CHD4/NuRD recruitment at Id2/Id4; I268F NAB-interaction knock-in mouse causing severe hypomyelination","pmids":["18456662","18524893"],"confidence":"High","gaps":["Target-specific switching between NAB activation and repression functions unresolved","How NuRD recruitment is targeted to specific loci not defined"]},{"year":2008,"claim":"Expanded EGR2's immune and regulatory network through thymic survival control, MeCP2 cross-regulation, and broader developmental roles.","evidence":"Egr2 knockout with Bcl-2 rescue in positive selection; reciprocal ChIP/knockdown of EGR2 and MeCP2","pmids":["19017967","19000991"],"confidence":"High","gaps":["MeCP2 cross-regulation from a single lab without genetic confirmation","Direct versus indirect control of Bcl-2 not fully resolved"]},{"year":2009,"claim":"Identified post-translational degradation control of EGR2 by AIP2, linking EGR2 protein turnover to activation-induced T-cell death.","evidence":"Co-IP, ubiquitination assays, and AIP2 siRNA with apoptosis readouts","pmids":["19651900"],"confidence":"High","gaps":["In vivo physiological role of AIP2-EGR2 axis not established","Ubiquitination site on EGR2 not mapped"]},{"year":2011,"claim":"Established EGR2 as a profibrotic effector downstream of TGF-β/Smad3 and a direct regulator of collagen/tendon programs, broadening its mesenchymal roles.","evidence":"ChIP and reporter assays at Col1a1 with chick gain-of-function and Egr1/Egr2 mouse mutants; Smad3-dependent reporter and gain/loss-of-function in fibroblasts","pmids":["21173153","21514423","20506119"],"confidence":"Medium","gaps":["TGF-β fibrosis findings from single labs","Distinct contributions of EGR1 versus EGR2 not fully separated"]},{"year":2012,"claim":"Genome-wide and genetic studies redefined EGR2 as a bidirectional, context-dependent regulator coordinating myelination, NKT lineage specification, and cytokine-signaling balance.","evidence":"EGR2/SOX10 ChIP-seq in myelinating nerve; ChIP-seq plus conditional KO for Zbtb16/Il2rb in NKT precursors; double-KO defining SOCS1/3 and Batf control","pmids":["22492709","22306690","23021953"],"confidence":"High","gaps":["Determinants of EGR2 acting as activator versus repressor at a given locus not resolved","Chromatin-state requirements for context-dependence not defined"]},{"year":2013,"claim":"Established EGR2 as a controller of the T-cell expansion-versus-differentiation checkpoint and resolved how upstream signaling tunes its Schwann-cell expression.","evidence":"ChIP and gain/loss-of-function defining Myc/Myb/Bcl6/Id3/Zeb2 control; Rac1-MKK7-JNK pathway dissection downregulating Krox20 in Schwann cells","pmids":["28487311","23505039"],"confidence":"High","gaps":["Rac1-Krox20 axis from a single lab","How sustained versus transient EGR2 levels are set in vivo not resolved"]},{"year":2014,"claim":"Revealed EGR2's dual immunological character, acting as a positive regulator of naive T-cell differentiation versus a negative regulator in activated cells, via direct control of Tbx21 and Notch1.","evidence":"Conditional KO with T-helper differentiation assays, direct target identification, and viral infection model","pmids":["25368162"],"confidence":"High","gaps":["Molecular switch governing positive versus negative activity not defined","Direct binding sites at all cytokine loci not mapped"]},{"year":2017,"claim":"Defined post-translational and protein-interaction layers controlling EGR2 immune output, including GCN5 acetylation enhancing activity and direct T-bet sequestration blocking Th1 differentiation, plus Treg-derived TGF-β3 control.","evidence":"Acetyltransferase assays with conditional KO in iNKT; co-IP and DNA-binding inhibition assays for T-bet; double-KO and adoptive transfer for Ltbp3/TGF-β3","pmids":["28723564","28455436","27911796","28487311"],"confidence":"High","gaps":["Acetylation sites and their stoichiometry not fully mapped","Balance between DNA-dependent and protein-sequestration modes of EGR2 action not quantified"]},{"year":2020,"claim":"Identified EGR2 as an epigenetic pioneer in macrophage polarization and defined the activating chromatin machinery and looping control it relies on.","evidence":"ChIP-seq/ATAC-seq plus conditional KO and TET2 co-IP downstream of IL-4/STAT6; Rnf40/H2Bub1 recruitment in Schwann cells; CTCF looping and SUZ12 interaction controlling EGR2","pmids":["33060136","32672815","32807777"],"confidence":"High","gaps":["How EGR2 selects activating versus repressive chromatin partners not resolved","Direct structural basis of TET2 recruitment not determined"]},{"year":2021,"claim":"Consolidated EGR2 as a DNA-demethylation pioneer across myeloid differentiation, a driver of cellular senescence, an alveolar-macrophage identity factor, and an enabler of T-cell exhaustion.","evidence":"Genome-wide methylation/ATAC/ChIP-seq with TET2 co-IP in monocytes; ChIP and gain/loss-of-function at ARF/p16; conditional KO in alveolar macrophages and exhausted CD8 T cells","pmids":["33692344","33547862","34797692","33986293"],"confidence":"High","gaps":["Senescence role from a single lab","How the same EGR2-TET2 module yields distinct lineage outcomes not resolved"]},{"year":2023,"claim":"Defined a therapeutically actionable EGR2-type I interferon axis driving CAR T-cell dysfunction.","evidence":"CRISPR EGR2 knockout in CAR T cells with interferon-β rescue and in vivo tumor models","pmids":["37011008"],"confidence":"High","gaps":["Direct EGR2 targets within the interferon program not fully mapped","Whether EGR2 acts upstream or within the interferon feedback loop not resolved"]},{"year":null,"claim":"What molecular determinant dictates whether EGR2 functions as an activator, a repressor, an epigenetic pioneer, or a protein sequestering factor at a given locus and cell type remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified rule linking cofactor composition (SOX10, NAB/NuRD, Rnf40, TET2, T-bet) to functional output","Structural basis of EGR2 cooperativity and protein sequestration undetermined","Post-translational code (acetylation, ubiquitination) integration with cofactor choice unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,6,15,24,34,36,38,47]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,6,15,21,34,36]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[42]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,15,24,36,47]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,15,24,36,47]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,8,20,30]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[18,34,37,38,40,49,54]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[24,47,48,50]}],"complexes":[],"partners":["SOX10","NAB1","NAB2","TET2","TBX21","GCN5","AIP2","CHD4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P11161","full_name":"E3 SUMO-protein ligase EGR2","aliases":["AT591","E3 SUMO-protein transferase ERG2","Early growth response protein 2","EGR-2","Zinc finger protein Krox-20"],"length_aa":476,"mass_kda":50.3,"function":"Sequence-specific DNA-binding transcription factor (PubMed:17717711). Plays a role in hindbrain segmentation by regulating the expression of a subset of homeobox containing genes and in Schwann cell myelination by regulating the expression of genes involved in the formation and maintenance of myelin (By similarity). Binds to two EGR2-consensus sites EGR2A (5'-CTGTAGGAG-3') and EGR2B (5'-ATGTAGGTG-3') in the HOXB3 enhancer and promotes HOXB3 transcriptional activation (By similarity). Binds to specific DNA sites located in the promoter region of HOXA4, HOXB2 and ERBB2 (By similarity). Regulates hindbrain segmentation by controlling the expression of Hox genes, such as HOXA4, HOXB3 and HOXB2, and thereby specifying odd and even rhombomeres (By similarity). Promotes the expression of HOXB3 in the rhombomere r5 in the hindbrain (By similarity). Regulates myelination in the peripheral nervous system after birth, possibly by regulating the expression of myelin proteins, such as MPZ, and by promoting the differentiation of Schwann cells (By similarity). Involved in the development of the jaw openener musculature, probably by playing a role in its innervation through trigeminal motor neurons (By similarity). May play a role in adipogenesis, possibly by regulating the expression of CEBPB (By similarity) E3 SUMO-protein ligase helping SUMO1 conjugation to its coregulators NAB1 and NAB2, whose sumoylation down-regulates EGR2 transcriptional activity","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P11161/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/EGR2","classification":"Not Classified","n_dependent_lines":37,"n_total_lines":1208,"dependency_fraction":0.030629139072847682},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/EGR2","total_profiled":1310},"omim":[{"mim_id":"615025","title":"CHARCOT-MARIE-TOOTH DISEASE, AXONAL, TYPE 2Q; CMT2Q","url":"https://www.omim.org/entry/615025"},{"mim_id":"614996","title":"MYELINATING SCHWANN CELL ELEMENT; MSE","url":"https://www.omim.org/entry/614996"},{"mim_id":"614984","title":"DEHYDROGENASE E1 AND TRANSKETOLASE DOMAINS-CONTAINING PROTEIN 1; DHTKD1","url":"https://www.omim.org/entry/614984"},{"mim_id":"612116","title":"UBIQUITIN-SPECIFIC PROTEASE 22; USP22","url":"https://www.omim.org/entry/612116"},{"mim_id":"609030","title":"DGCR8 MICROPROCESSOR COMPLEX SUBUNIT; DGCR8","url":"https://www.omim.org/entry/609030"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"epididymis","ntpm":56.3},{"tissue":"thyroid gland","ntpm":114.5}],"url":"https://www.proteinatlas.org/search/EGR2"},"hgnc":{"alias_symbol":[],"prev_symbol":["KROX20"]},"alphafold":{"accession":"P11161","domains":[{"cath_id":"3.30.160.60","chopping":"368-428","consensus_level":"medium","plddt":86.5675,"start":368,"end":428}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P11161","model_url":"https://alphafold.ebi.ac.uk/files/AF-P11161-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P11161-F1-predicted_aligned_error_v6.png","plddt_mean":47.84},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EGR2","jax_strain_url":"https://www.jax.org/strain/search?query=EGR2"},"sequence":{"accession":"P11161","fasta_url":"https://rest.uniprot.org/uniprotkb/P11161.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P11161/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P11161"}},"corpus_meta":[{"pmid":"8464695","id":"PMC_8464695","title":"Cloning of the zebrafish krox-20 gene (krx-20) and its expression during hindbrain development.","date":"1993","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/8464695","citation_count":660,"is_preprint":false},{"pmid":"8224839","id":"PMC_8224839","title":"Perinatal lethality and defects in hindbrain development in mice homozygous for a targeted mutation of the zinc finger gene Krox20.","date":"1993","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/8224839","citation_count":408,"is_preprint":false},{"pmid":"9537424","id":"PMC_9537424","title":"Mutations in the early growth response 2 (EGR2) gene are associated with hereditary myelinopathies.","date":"1998","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9537424","citation_count":384,"is_preprint":false},{"pmid":"15834410","id":"PMC_15834410","title":"Egr-2 and Egr-3 are negative regulators of T cell activation.","date":"2005","source":"Nature 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driving cell fate choices in hindbrain patterning.","date":"2013","source":"Molecular systems biology","url":"https://pubmed.ncbi.nlm.nih.gov/24061538","citation_count":25,"is_preprint":false},{"pmid":"20553903","id":"PMC_20553903","title":"Analysis of expression and function of FGF-MAPK signaling components in the hindbrain reveals a central role for FGF3 in the regulation of Krox20, mediated by Pea3.","date":"2010","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/20553903","citation_count":25,"is_preprint":false},{"pmid":"25344368","id":"PMC_25344368","title":"Loss of Krox20 results in aortic valve regurgitation and impaired transcriptional activation of fibrillar collagen genes.","date":"2014","source":"Cardiovascular research","url":"https://pubmed.ncbi.nlm.nih.gov/25344368","citation_count":24,"is_preprint":false},{"pmid":"35045301","id":"PMC_35045301","title":"Uncontrolled CD21low age-associated and B1 B cell accumulation caused by failure of an EGR2/3 tolerance checkpoint.","date":"2022","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/35045301","citation_count":23,"is_preprint":false},{"pmid":"26204789","id":"PMC_26204789","title":"The EGR2 gene is involved in axonal Charcot-Marie-Tooth disease.","date":"2015","source":"European journal of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/26204789","citation_count":23,"is_preprint":false},{"pmid":"33980319","id":"PMC_33980319","title":"The YAP/HIF-1α/miR-182/EGR2 axis is implicated in asthma severity through the control of Th17 cell differentiation.","date":"2021","source":"Cell & bioscience","url":"https://pubmed.ncbi.nlm.nih.gov/33980319","citation_count":23,"is_preprint":false},{"pmid":"23716134","id":"PMC_23716134","title":"Egr2 induced during DC development acts as an intrinsic negative regulator of DC immunogenicity.","date":"2013","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/23716134","citation_count":23,"is_preprint":false},{"pmid":"28842216","id":"PMC_28842216","title":"Egr2 enhances insulin resistance via JAK2/STAT3/SOCS-1 pathway in HepG2 cells treated with palmitate.","date":"2017","source":"General and comparative endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/28842216","citation_count":22,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48773,"output_tokens":12789,"usd":0.169077,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":24387,"output_tokens":6852,"usd":0.146618,"stage2_stop_reason":"end_turn"},"total_usd":0.315695,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1989,\n      \"finding\": \"EGR2/Krox-20 expression is induced by serum via a serum response element (SRE/CArG box) in its promoter that binds the same nuclear protein as the c-fos SRE, linking EGR2 to the immediate-early serum response gene network. Alternative splicing of the 5'-most intron produces proteins with different N-termini.\",\n      \"method\": \"Promoter deletion analysis, mutagenesis, gel-shift assays, Northern blot, genomic mapping\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro mutagenesis and transient transfection reporter assays with deletion series, replicated by functional SRE substitution\",\n      \"pmids\": [\"2496302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"The EGR2 promoter contains two CArG elements (CArG-1 and CArG-2); serum and PMA responsiveness maps specifically to CArG-1, and both protein kinase C-dependent and -independent pathways converge on this element to drive EGR2 transcription.\",\n      \"method\": \"Deletion analysis, mutagenesis, transient CAT reporter assays, S1 nuclease/primer extension\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — functional deletion series with mutagenesis in transient transfection, orthogonal pathway inhibitor experiments\",\n      \"pmids\": [\"2111009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Krox20 protein directly binds three Krox20-binding sites in the HoxB2 r3/r5 enhancer (demonstrated in vitro) and is required in vivo for rhombomere-restricted HoxB2 expression; ectopic Krox20 can transactivate a HoxB2 r3/r5 enhancer reporter in transgenic mice, establishing Krox20 as a direct transcriptional activator of HoxB2 during hindbrain segmentation.\",\n      \"method\": \"In vitro binding/competition assays with bacterially expressed Krox20, transgenic reporter mice, ectopic expression\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding reconstituted with purified protein plus in vivo transgenic validation; replicated concept in multiple enhancers\",\n      \"pmids\": [\"8093858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Targeted deletion of Krox20 (including the zinc-finger DNA-binding domain) in mice results in perinatal lethality with loss of rhombomeres 3 and 5, establishing an essential in vivo role for Krox20 in hindbrain segmentation.\",\n      \"method\": \"Gene targeting/knockout in mice, histological and neuroanatomical analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic loss-of-function with specific anatomical phenotype; widely replicated\",\n      \"pmids\": [\"8224839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"NAB1, identified by yeast two-hybrid, binds the R1 inhibitory domain of NGFI-A/Egr1 and represses transcriptional activation by both NGFI-A and Krox20/EGR2, but not Egr3 or NGFI-C, providing a mechanism for differential regulation within the EGR family.\",\n      \"method\": \"Yeast two-hybrid, transcriptional repression assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid interaction plus functional reporter assays, single lab\",\n      \"pmids\": [\"7624335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"NAB2, a second corepressor highly related to NAB1, interacts with the R1 domain of NGFI-A and represses transcriptional activity of both NGFI-A and Krox20/EGR2; NAB2 expression is induced by the same stimuli that activate NGFI-A, creating a feedback repression loop.\",\n      \"method\": \"Protein interaction assays, transcriptional reporter assays, expression analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — domain interaction mapping plus functional repression assays, single lab\",\n      \"pmids\": [\"8668170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Krox-20 directly activates Hoxa-2 expression in rhombomeres 3 and 5: Krox20 protein binds two sites in the Hoxa-2 r3/r5 enhancer in vitro; mutation of these sites abolishes r3/r5 activity in transgenic mice; ectopic Krox20 in r4 transactivates the Hoxa-2/lacZ reporter, demonstrating direct transcriptional control of multiple group-2 Hox paralogs.\",\n      \"method\": \"In vitro binding/competition assays, transgenic analysis with lacZ reporters, mutational analysis, ectopic expression\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro binding with purified protein plus in vivo transgenic mutagenesis, multiple orthogonal approaches\",\n      \"pmids\": [\"8625806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In Krox-20-null Schwann cells, SCIP expression is converted from transient to sustained, and both Schwann cell proliferation and apoptosis are markedly increased at postnatal stages, demonstrating that Krox20 controls SCIP expression, cell cycle exit, and susceptibility to apoptosis during Schwann cell development.\",\n      \"method\": \"Krox-20 knockout mouse analysis, immunohistochemistry, cell proliferation and apoptosis assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple specific cellular phenotype readouts replicated across developmental timepoints\",\n      \"pmids\": [\"10068633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Krox20 is essential for specification of rhombomere identity: in Krox20-null embryos, r3 cells acquire r2/r4 identity and r5 cells acquire r6 identity; chimeric analysis shows r3/r5 mutant cells adopt even-numbered rhombomere mingling properties, demonstrating Krox20 couples segment formation, cell segregation, and regional identity specification.\",\n      \"method\": \"Genetic fate mapping, molecular marker analysis, embryonic chimeras\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic tools including chimeras, fate mapping, and molecular marker analysis\",\n      \"pmids\": [\"11748134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Krox20 expression in Schwann cells is controlled by two axon-dependent cis-acting elements—an immature Schwann cell element (ISE) and a myelinating Schwann cell element (MSE, ~35 kb downstream)—acting in succession during development; the MSE requires the POU-domain factor Oct6 and contains multiple Oct6 binding sites, indicating Oct6 directly activates Krox20 transcription.\",\n      \"method\": \"Transgenic reporter analysis, in vivo nerve regeneration experiments, genetic epistasis with Oct6 mutants\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — transgenic analysis plus genetic epistasis, multiple orthogonal methods\",\n      \"pmids\": [\"11782409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Krox20 synergizes with kreisler to activate Hoxb3 transcription via direct binding to the Hoxb3 r5 enhancer; Krox20 is required for enhancer activity specifically in r5 (the overlap domain of Krox20 and kreisler), demonstrating combinatorial transcriptional control.\",\n      \"method\": \"Genetic analysis (Krox20 mutant mice), mutational analysis of enhancer, ectopic expression, in vitro binding\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding plus in vivo transgenic mutagenesis plus genetic epistasis in multiple studies\",\n      \"pmids\": [\"11823429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"HCF-1 functions as a transcriptional coactivator for Krox20; Krox20 contains a functional HCF-binding motif in its N-terminal activation domain; mutation of this motif reduces both transactivation and association with the HCF-1 β-propeller domain; HCF-1's C-terminal activation domain contributes to Krox20-mediated activation, possibly through recruitment of p300.\",\n      \"method\": \"Coimmunoprecipitation, transcriptional reporter assays, mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction mapping with mutagenesis plus functional reporter assays, single lab\",\n      \"pmids\": [\"14532282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"EGR2 directly transactivates BNIP3L and BAK expression as demonstrated by cDNA microarray and functional studies, inducing apoptosis through mitochondrial membrane permeability changes, cytochrome c release, and caspase-3, -8, and -9 activation downstream of the PTEN-EGR2 pathway.\",\n      \"method\": \"Adenovirus-mediated gene transfer, cDNA microarray, caspase activity assays, cytochrome c release assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays with OE plus microarray identification of direct targets, single lab\",\n      \"pmids\": [\"12687019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Krox20 neural crest expression requires a cis-acting enhancer (NCE) 26 kb upstream containing two conserved Krox20-binding sites that mediate direct autoregulation, plus an HMG-box binding element responsive to Sox10; Sox10 synergizes with Krox20 to activate the NCE in vitro, and Sox10 inactivation prevents maintenance of Krox20 expression in migrating neural crest.\",\n      \"method\": \"Transgenic analysis with reporter constructs, mutagenesis of binding sites, in vitro transcription assays, Sox10 knockout analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of specific binding sites combined with transgenic validation and genetic epistasis\",\n      \"pmids\": [\"12538520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Krox-20 cell-autonomously inactivates the JNK-c-Jun pathway in Schwann cells, thereby coordinately suppressing both neuregulin-1-induced proliferation and TGFβ/serum deprivation-induced death; Krox-20 also upregulates the JNK scaffold protein JIP-1, suggesting a mechanism for JNK regulation.\",\n      \"method\": \"Enforced Krox-20 expression in Schwann cells and fibroblasts, proliferation and apoptosis assays, JNK pathway activation assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function in multiple cell types with multiple pathway readouts, cell-autonomous demonstration\",\n      \"pmids\": [\"14757751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"EGR2/Egr2 directly binds a conserved element in the first intron of Myelin Protein Zero (Mpz) containing Egr2 binding sites; this element is transactivated by Egr2 and repressed by NAB corepressors; Egr2 binds this intron element in vivo (ChIP); Egr2 and Sox10 synergistically activate the element, while forskolin and IGF-1 induce Mpz in an Egr2-dependent manner.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), transactivation reporter assays, mutagenesis, pharmacological inducers\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo ChIP plus mutagenesis plus transactivation assays, multiple orthogonal methods\",\n      \"pmids\": [\"16373334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Egr2/Krox20 and SREBP transcription factors synergistically activate promoters of several cholesterol/lipid biosynthetic genes during myelination; Egr2 does not regulate SREBP pathway component levels but directly co-activates SREBP target gene promoters as part of the myelination program.\",\n      \"method\": \"Reporter assays, expression analysis during sciatic nerve development\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — reporter assays for synergistic activation plus developmental expression correlation, single lab\",\n      \"pmids\": [\"15836632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Krox20 stimulates adipogenesis by transactivating the C/EBPβ promoter and increasing C/EBPβ expression in 3T3-L1 preadipocytes; RNAi knockdown of C/EBPβ diminishes the proadipogenic effect of Krox20; coexpression of Krox20 with C/EBPβ in naïve NIH3T3 cells induces a fully differentiated adipocyte phenotype.\",\n      \"method\": \"Overexpression, RNAi knockdown, reporter assays, adipogenesis assays in cell lines\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain- and loss-of-function with multiple orthogonal readouts, epistasis demonstrated\",\n      \"pmids\": [\"16054051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Overexpression of Egr-2 and Egr-3 in T cells increases E3 ubiquitin ligase Cbl-b expression and inhibits T cell activation; Egr3-/- T cells have lower Cbl-b expression and are resistant to in vivo peptide-induced tolerance, identifying Egr2 and Egr3 as negative regulators of T cell activation that act through Cbl-b.\",\n      \"method\": \"Overexpression, knockout mice, in vivo tolerance assays, gene expression analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus OE with in vivo and in vitro readouts across multiple experimental conditions\",\n      \"pmids\": [\"15834410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Krox20 expression in Schwann cells during the promyelin-myelin transition is directly activated by POU proteins Oct6 and Brn2 acting on the myelinating Schwann cell enhancer (MSE); synergism between POU proteins and Sox10 on this enhancer suggests Krox20 expression requires this combination of upstream factors, placing Krox20 downstream of Oct6/Brn2/Sox10 in the myelination transcription factor cascade.\",\n      \"method\": \"Cell culture transactivation assays, transgenesis, mutagenesis of binding sites\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell culture combined with transgenesis and mutagenesis, multiple factors tested\",\n      \"pmids\": [\"16311519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Specific inactivation of Krox20 in adult Schwann cells results in severe demyelination with Schwann cell dedifferentiation and increased proliferation, demonstrating that Krox20 is required not only for onset of myelination but also for maintenance of the myelinating state in adult peripheral nerve.\",\n      \"method\": \"Conditional Krox20 knockout in adult mice, histological and ultrastructural analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with specific temporal and cell-type control, multiple phenotypic readouts\",\n      \"pmids\": [\"16988048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In vivo ChIP assays in myelinating rat sciatic nerve demonstrate direct Egr2 binding to the Schwann cell enhancer of the myelin basic protein (MBP) gene, to a conserved site in the myelin-associated glycoprotein (MAG) gene, and to an intronic site in the Desert Hedgehog (Dhh) gene, establishing direct regulation of these targets.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) in vivo in myelinating nerve\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo ChIP in native tissue with multiple target loci\",\n      \"pmids\": [\"16923174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Three long-range (>200 kb) enhancer elements (A, B, C) control Krox20 transcription in the hindbrain; elements B and C function as initiators in r5 and r3-r5 respectively independent of Krox20 protein; element A contains Krox20-binding sites required for activity, establishing a direct positive autoregulatory loop; element B contains a vHNF1 binding site required for its activity, identifying vHNF1 as a direct initiator.\",\n      \"method\": \"Transgenic analysis with reporter constructs, enhancer knockout mice, mutagenesis of binding sites\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — enhancer knockout in mice combined with mutagenesis of specific transcription factor binding sites, multiple elements characterized\",\n      \"pmids\": [\"16495311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Neuropathy-associated dominant EGR2 mutants disrupt EGR2/SOX10 synergy at the Mpz intron element: the mutants do not perturb EGR2 binding but attenuate SOX10 binding at both the Mpz intron and MAG gene elements (shown by ChIP), demonstrating that dominant EGR2 mutations cause peripheral neuropathy by antagonizing SOX10 binding at cooperative regulatory sites.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), transcriptional reporter assays, mutagenesis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo ChIP with mutant proteins plus mutagenesis of binding sites, mechanistic explanation for dominant negative effect\",\n      \"pmids\": [\"17325040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Egr2 directly represses genes (including Id2, Id4, and Rad) during myelination in conjunction with NAB corepressors: in vivo ChIP in myelinating sciatic nerve shows developmental association of both Egr2 and NAB2 on these promoters; NAB2 represses transcription by recruiting CHD4, a subunit of the NuRD chromatin remodeling complex; repression of Id2 augments Mpz activation.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) in vivo, gene expression screen, epistasis experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo ChIP in native myelinating tissue demonstrating co-occupancy of Egr2 and NAB2, plus NuRD complex recruitment, multiple targets\",\n      \"pmids\": [\"18456662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Krox20-null mutation of the Nab interaction domain (I268F) in mice causes severe hypomyelination mimicking congenital hypomyelinating neuropathy in humans; the Krox20-Nab interaction is required for regulation of most Krox20 target genes, but the molecular function of this interaction is target-dependent.\",\n      \"method\": \"Knock-in mouse model, immunohistochemical, ultrastructural, and expression analyses\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — precise knock-in mutagenesis with comprehensive phenotypic and molecular characterization\",\n      \"pmids\": [\"18524893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Egr2 is required for sustained Bcl-2 upregulation during late stages of positive selection in the thymus; enforced Bcl-2 expression rescues T cell development in Egr2-/- thymocytes, placing Egr2 upstream of Bcl-2 in the survival pathway during positive selection.\",\n      \"method\": \"Egr2 knockout mice, gene expression analysis, Bcl-2 rescue experiments\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus rescue experiment establishing epistatic relationship\",\n      \"pmids\": [\"19017967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rostral Krox20 enhancer element C contains functional binding sites for Meis and Hox/Pbx factors that synergize to activate the enhancer; mutation of these sites shows that Krox20 is under direct transcriptional control of both Meis (presumably Meis2) and Hox/Pbx in r3; Hoxb1 binds to element C in vivo.\",\n      \"method\": \"In vivo ChIP, transgenic analysis with mutated enhancer constructs\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo ChIP plus transgenic enhancer mutagenesis with multiple transcription factors tested\",\n      \"pmids\": [\"18787068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"EGR2 and MeCP2 reciprocally regulate each other: ChIP shows EGR2 binding to the MECP2 promoter and MeCP2 binding to the EGR2 intron 1 enhancer; RNAi-mediated reduction of either EGR2 or MeCP2 reciprocally reduces the other's expression and protein levels.\",\n      \"method\": \"Chromatin immunoprecipitation, RNAi knockdown, quantitative expression analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ChIP plus reciprocal knockdown, single lab\",\n      \"pmids\": [\"19000991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The HECT-type E3 ubiquitin ligase AIP2 interacts with EGR2 and promotes its ubiquitin-mediated proteasomal degradation; AIP2 suppresses EGR2-mediated FasL expression, thereby inhibiting activation-induced T-cell death; siRNA knockdown of AIP2 upregulates EGR2, inhibits EGR2 ubiquitination, and enhances T-cell apoptosis.\",\n      \"method\": \"Coimmunoprecipitation, ubiquitination assays, siRNA knockdown, apoptosis assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical interaction, ubiquitination assay, and loss-of-function with defined molecular and cellular readouts\",\n      \"pmids\": [\"19651900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"EGR1 and EGR2 directly bind the Col1a1 promoter tendon regulatory regions (shown by ChIP) and transactivate the mouse Col1a1 proximal promoter; FGF4 activates Egr gene expression and tendon collagen expression in chick limbs; Egr1 or Egr2 misexpression in chick induces de novo scleraxis, Col1a1, and other tendon collagen expression; Egr1/Egr2 mouse mutants show reduced Col1a1 transcripts and fewer collagen fibrils.\",\n      \"method\": \"Chromatin immunoprecipitation, reporter assays, gain-of-function in chick, knockout mouse analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo ChIP plus reporter assays plus gain-of-function in chick plus mouse KO, multiple orthogonal approaches\",\n      \"pmids\": [\"21173153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"EGR1 and EGR3 activate NAB2 transcription in melanoma and carcinoma cells through similar cis-regulatory elements, and EGR2 also induces NAB2 expression (less potently); NAB2 in turn represses each EGR's activity on the NAB2 promoter, establishing a negative feedback loop; siRNA reduction of EGR2 reduces endogenous NAB2 levels.\",\n      \"method\": \"Promoter reporter assays, siRNA knockdown, expression analysis\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — reporter assays plus siRNA, single lab\",\n      \"pmids\": [\"20506119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Krox20/EGR2 haploinsufficiency accelerates growth and differentiation in preosteoclast cultures derived from splenocytes; Krox20 silencing increases cFms (M-CSFR) expression and response to M-CSF, leading to cell-autonomous stimulation of cell-cycle progression in preosteoclasts, resulting in increased bone resorption and low bone mass in vivo.\",\n      \"method\": \"Conditional KO/haploinsufficiency mice, preosteoclast cultures, siRNA, cell proliferation assays, microcomputed tomography\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic model plus cell-autonomous in vitro demonstration, single lab\",\n      \"pmids\": [\"20716776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TGF-β induces EGR2 expression in fibroblasts via a Smad3-dependent mechanism; EGR2 overexpression is sufficient to stimulate collagen gene expression and myofibroblast differentiation; EGR2 depletion attenuates TGF-β profibrotic responses, establishing EGR2 as a necessary and sufficient mediator of TGF-β-induced fibrosis.\",\n      \"method\": \"Smad3-dependent reporter assays, overexpression, siRNA depletion, gene expression profiling\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with defined profibrotic phenotype, pathway placement via Smad3, single lab\",\n      \"pmids\": [\"21514423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Egr2 binds the promoter of Zbtb16 (encoding PLZF) and the promoter of Il2rb (IL-2Rβ) in NKT precursors, directly activating their transcription (shown by ChIP-seq); higher and more prolonged Egr2 expression in NKT precursors specifies both early and late stages of NKT lineage differentiation.\",\n      \"method\": \"Chromatin immunoprecipitation followed by deep sequencing (ChIP-seq), conditional knockout analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide ChIP-seq with direct promoter binding plus genetic loss-of-function, multiple target genes validated\",\n      \"pmids\": [\"22306690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Egr2 and Egr3 double-deficient B and T cells exhibit hyperactive STAT1 and STAT3 and severely impaired AP-1 activation; Egr2 and/or Egr3 directly induce expression of SOCS1 and SOCS3 (inhibitors of STAT1/3), and block the function of Batf (an AP-1 inhibitor), establishing these factors as regulators of cytokine signaling balance.\",\n      \"method\": \"Conditional double-knockout mice, reporter assays, gene expression analysis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double-KO with defined molecular mechanism and direct target gene validation\",\n      \"pmids\": [\"23021953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Genome-wide ChIP-seq of EGR2 and SOX10 in myelinating peripheral nerve identifies extensive co-binding at myelin gene regulatory regions; EGR2 represses a set of early developmental genes that SOX10 activates independently of EGR2, demonstrating coordinate and antagonistic gene regulation during myelination.\",\n      \"method\": \"ChIP-seq in vivo in myelinating nerve, integration with loss-of-function expression arrays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide in vivo ChIP-seq integrated with loss-of-function transcriptomic data\",\n      \"pmids\": [\"22492709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Conditional Egr2 deletion in peripheral T cells abolishes induced expression of DGK-α and other anergy genes, and restores Ras/MAPK signaling, IL-2 production, and proliferation upon attempted anergy induction; Egr2 is necessary for anergy induction in vivo using superantigen- and tumor-induced models, establishing Egr2 as an essential transcriptional regulator of the T cell anergy program.\",\n      \"method\": \"Conditional Egr2 knockout mice, in vivo anergy induction models, gene expression analysis, signaling assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple in vivo and in vitro anergy models and molecular readouts\",\n      \"pmids\": [\"23129747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Egr2 directly binds and controls expression of genes regulating proliferation (Myc and Myb) and differentiation repressors (Bcl6, Id3), while repressing transcription factors required for effector function (Zeb2, RORa, RORc, Bhlhe40); Egr2 and 3 expression is regulated reciprocally by antigen and IFNγ; sustained Egr2 expression enhances expansion but impairs effector differentiation.\",\n      \"method\": \"ChIP, conditional knockout mice, overexpression, gene expression analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo ChIP plus gain- and loss-of-function with defined molecular targets across multiple T cell subsets\",\n      \"pmids\": [\"28487311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Active Rac1 GTPase negatively regulates Schwann cell differentiation by upregulating c-jun and downregulating Krox20 through the MKK7-JNK pathway (not through Raf-ERK); ErbB2 signaling prevents MKK7 activation and c-jun induction; Rac inhibition blocks MKK7 activation and c-jun induction after axotomy.\",\n      \"method\": \"Primary Schwann cell cultures, Rac1 activation/inhibition, siRNA, kinase inhibitors, sciatic nerve axotomy model\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway dissection with multiple inhibitors and siRNA in primary cells plus in vivo nerve model, single lab\",\n      \"pmids\": [\"23505039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"EGR2 is a direct transcriptional regulator of Tbx21 and Notch1 (shown as direct target genes); EGR2 promotes peripheral naïve T-cell differentiation and is required for production of IFN-γ, IL-4, IL-9, and IL-17A, functioning as a positive regulator of naïve T-cell differentiation in contrast to its negative regulatory role in activated T cells.\",\n      \"method\": \"Conditional knockout mice, T-helper differentiation assays, direct target gene identification, viral infection model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with identification of direct target genes and multiple in vivo and in vitro phenotypic readouts\",\n      \"pmids\": [\"25368162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Egr2 and Egr3 expressed in T cells cooperatively control TGF-β3 secretion from CD4+CD25-LAG3+ regulatory T cells by maintaining expression of Ltbp3 (latent TGF-β binding protein 3); T cell-specific Egr2/Egr3 double-KO mice develop lupus-like disease with complete loss of TGF-β3 production from LAG3+ cells, adoptive transfer of WT LAG3+ cells rescues the phenotype.\",\n      \"method\": \"T cell-specific double-knockout mice, adoptive transfer, cytokine analysis, gene expression\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double-KO plus adoptive transfer rescue, defined molecular mechanism via Ltbp3\",\n      \"pmids\": [\"27911796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Egr2 and Egr3 physically interact with the T-box domain of T-bet, blocking T-bet DNA binding and inhibiting T-bet-mediated IFN-γ production; this interaction antagonizes Th1 differentiation.\",\n      \"method\": \"Co-immunoprecipitation, DNA binding assays, T cell differentiation assays, KO mice\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical protein-protein interaction plus functional DNA-binding inhibition assays plus genetic KO\",\n      \"pmids\": [\"28455436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The lysine acetyltransferase GCN5 directly acetylates EGR2, positively regulating EGR2 transcriptional activity; GCN5 deficiency blocks iNKT cell development in a cell-intrinsic manner and specifically inhibits EGR2 target gene transcription (Runx1, PLZF, IL-2Rβ, T-bet) in iNKT cells.\",\n      \"method\": \"Acetyltransferase assay, conditional KO mice, reporter assays, gene expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical acetyltransferase assay identifying specific modification plus conditional KO with direct target gene analysis\",\n      \"pmids\": [\"28723564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Egr2 binds and controls expression of Myc and Myb (proliferation genes) and differentiation repressors Bcl6 and Id3 while repressing Zeb2, RORa, RORc, and Bhlhe40; Egr2 and Egr3 operate as a checkpoint controlling the transition between clonal expansion and differentiation of effector T cells.\",\n      \"method\": \"ChIP, conditional DKO mice, OE, gene expression profiling\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo ChIP plus DKO and OE with defined molecular pathway placement\",\n      \"pmids\": [\"28487311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Endogenous KLF4 and Krox20 are dispensable for adipogenesis in culture and brown adipose tissue development in mice (as shown by conditional knockout), contrary to overexpression studies, while PPARγ remains essential.\",\n      \"method\": \"Conditional knockout mice, primary preadipocyte cultures\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO in vivo and in vitro, negative finding about endogenous Krox20 requirement in adipogenesis\",\n      \"pmids\": [\"27777310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CTCF establishes chromatin interaction loops between enhancer and promoter regulatory elements to promote EGR2 expression in Schwann cells; CTCF deletion blocks Schwann cell differentiation at the pro-myelinating stage while CTCF overexpression promotes myelination; CTCF also interacts with SUZ12 (PRC2 component) to repress genes negatively regulating Schwann cell maturation.\",\n      \"method\": \"CTCF conditional KO and OE, chromatin conformation capture, co-immunoprecipitation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO and OE with chromatin looping assays and Co-IP for CTCF-SUZ12 interaction\",\n      \"pmids\": [\"32807777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EGR2 is a direct target of IL-4-activated STAT6 and acts as a molecular linchpin in alternative macrophage polarization; EGR2 binding results in chromatin opening and recruitment of chromatin remodelers and RNA polymerase II; EGR2 is required for 77% of the IL-4-induced gene signature including its own autoregulation and downstream PPARG induction; EGR2 interacts with the 5mC hydroxylase TET2 to initiate DNA demethylation at its binding sites.\",\n      \"method\": \"ChIP-seq, ATAC-seq, conditional KO, reporter assays, co-IP with TET2\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide chromatin profiling plus genetic KO plus biochemical TET2 interaction, multiple orthogonal methods\",\n      \"pmids\": [\"33060136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Egr2 recruits the Rnf40-containing E3 ubiquitin ligase (responsible for histone H2B monoubiquitination) to its target genes in myelinating Schwann cells; Rnf40/H2Bub1 is required for selective high expression of myelin and lipid biosynthesis genes and proper repression of immaturity genes during peripheral nerve myelination.\",\n      \"method\": \"Conditional Rnf40 KO mice, ChIP-seq, RNA-seq, co-immunoprecipitation/recruitment assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — conditional KO combined with genome-wide ChIP-seq and RNA-seq, biochemical recruitment assay, multiple orthogonal approaches\",\n      \"pmids\": [\"32672815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Chronic antigen exposure induces EGR2 selectively in progenitor exhausted CD8+ T cells; EGR2 enables terminal exhaustion and stabilizes the exhausted transcriptional state by direct EGR2-dependent control of exhaustion-associated genes and indirect maintenance of the exhausted epigenetic state.\",\n      \"method\": \"Conditional EGR2 deletion, chronic LCMV and tumor models, ATAC-seq, ChIP, transcriptomics\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in two in vivo models with integrated epigenomic and transcriptomic profiling\",\n      \"pmids\": [\"33986293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"EGR2 is an epigenetic pioneer in differentiating human monocytes: EGR2 binding results in active DNA demethylation at both stable and transient binding sites; EGR2 physically interacts with TET2 (5mC hydroxylase); EGR2 is essential for monocyte differentiation and DNA methylation turnover.\",\n      \"method\": \"Genome-wide methylation profiling, ATAC-seq, ChIP-seq, co-immunoprecipitation, EGR2 KD\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical TET2 interaction plus genome-wide epigenomic profiling plus functional KD, multiple orthogonal methods\",\n      \"pmids\": [\"33692344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"EGR2 directly binds and activates the ARF and p16 promoters to promote cellular senescence; EGR2 loss transiently reverses the senescent phenotype in human mammary epithelial cells and fibroblasts; EGR2 overexpression is sufficient to induce senescence, placing EGR2 as a direct transcriptional activator of the p16/pRB and ARF/p53/p21 pathways.\",\n      \"method\": \"ChIP, siRNA knockdown, overexpression, reporter assays, flow cytometry\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus gain- and loss-of-function, single lab\",\n      \"pmids\": [\"33547862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cell-intrinsic EGR2 is driven by TGF-β and GM-CSF in a PPAR-γ-dependent manner to control tissue-specific identity of alveolar macrophages; EGR2 is indispensable for repopulation of the alveolar niche after bleomycin-induced lung injury, and EGR2-dependent monocyte-derived alveolar macrophages are required for effective tissue repair.\",\n      \"method\": \"Conditional EGR2 KO mice, lung injury models, flow cytometry, gene expression\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with pathway placement (TGF-β/GM-CSF/PPARγ) and multiple in vivo functional readouts\",\n      \"pmids\": [\"34797692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"EGR2 transcription factor increases IGF2BP1/2/3 expression in renal cell carcinoma by directly binding IGF2BP promoters (validated by ChIP-qPCR and dual-luciferase reporter assays); IGF2BPs in turn regulate S1PR3 expression in an m6A-dependent manner by enhancing S1PR3 mRNA stability, promoting RCC tumorigenesis via the PI3K/AKT pathway.\",\n      \"method\": \"ChIP-qPCR, dual-luciferase reporter assays, RIP-qPCR, m6A assays, in vitro and in vivo functional assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assays plus functional xenograft, single lab\",\n      \"pmids\": [\"34326314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"EGR2 knockout in CAR T cells blocks type I interferon-mediated inhibitory programming induced by chronic antigen stimulation, expands early memory CAR T cells, and improves antitumor efficacy; EGR2 ablation suppresses dysfunction by inhibiting type I interferon signaling, and the protective effect is overridden by exogenous interferon-β, establishing an EGR2-type I interferon axis in CAR T cell exhaustion.\",\n      \"method\": \"CRISPR/Cas9 EGR2 KO in primary CAR T cells, gene expression profiling, in vivo tumor models, interferon pathway assays\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus interferon rescue experiment plus in vivo tumor models establishing mechanism\",\n      \"pmids\": [\"37011008\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EGR2/Krox20 is a zinc-finger transcription factor that directly binds GC-rich DNA sequences via its three zinc fingers to activate or repress target genes in a context-dependent manner; it acts as a master regulator of peripheral nerve myelination (directly activating Mpz, MBP, MAG, Dhh, and lipid biosynthetic genes in concert with SOX10 while repressing Id2/Id4 via NAB-NuRD co-repressor complexes), controls hindbrain segmentation by directly activating HoxB2, HoxA2, and HoxB3 enhancers in r3/r5, governs T cell anergy and exhaustion through transcriptional programs that include Cbl-b, DGK-α, LAG-3, and 4-1BB, drives alternative macrophage polarization downstream of IL-4/STAT6 as an epigenetic pioneer that recruits TET2 for DNA demethylation and chromatin remodelers for gene activation, is subject to post-translational regulation by GCN5-mediated acetylation (enhancing its activity) and AIP2-mediated ubiquitination (targeting it for degradation), and is transcriptionally controlled upstream by FGF-MAPK/ERK signaling, Oct6/Brn2/Sox10, CTCF-mediated chromatin looping, and a direct positive autoregulatory loop.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EGR2 (Krox20) is a zinc-finger immediate-early transcription factor that binds defined GC-rich enhancer and promoter elements to orchestrate cell-fate decisions in the developing hindbrain, the peripheral nervous system, and the immune system, with its own transcription induced through serum/PMA-responsive CArG elements that link it to the immediate-early gene network [#0, #1]. In the hindbrain, EGR2 directly binds and transactivates rhombomere-3/5 enhancers of HoxB2, Hoxa2, and Hoxb3, often combinatorially with kreisler, and is genetically required for formation and identity specification of rhombomeres 3 and 5 [#2, #6, #10, #3, #8]; its own expression in this domain is driven by long-range enhancers integrating vHNF1, Meis, and Hox/Pbx inputs together with a direct positive autoregulatory loop [#22, #27]. In Schwann cells, EGR2 is the master myelination regulator, directly occupying and activating myelin and lipid-biosynthetic gene loci including Mpz, MBP, MAG, and Dhh in cooperation with SOX10, while repressing immaturity genes such as Id2/Id4 [#15, #21, #36, #16, #24]; it is required both to initiate and to maintain the myelinating state, and it enforces cell-cycle exit by inactivating the JNK/c-Jun pathway and converting SCIP from transient to sustained [#20, #7, #14]. EGR2 transcription in Schwann cells is positioned downstream of the Oct6/Brn2/SOX10 cascade acting on the myelinating Schwann cell enhancer and of CTCF-mediated enhancer-promoter looping [#9, #19, #46]. EGR2 represses targets by recruiting the NAB1/NAB2 corepressors, which in turn engage the CHD4/NuRD chromatin-remodeling complex, and activates targets by recruiting the Rnf40 H2B-monoubiquitination ligase [#5, #24, #48]. In the immune system EGR2 controls T-cell anergy, NKT and effector differentiation, and the clonal expansion-to-differentiation checkpoint by directly regulating genes such as DGK-\\u03b1, Cbl-b, Bcl-2, Zbtb16/PLZF, Il2rb, Myc, Myb, Bcl6, and Id3 and by physically sequestering T-bet to block Th1 differentiation [#37, #18, #26, #34, #38, #42], and it enables terminal CD8 T-cell and CAR-T exhaustion partly through a type I interferon axis [#49, #54]. Across myeloid lineages EGR2 acts as an epigenetic pioneer downstream of IL-4/STAT6, opening chromatin and recruiting TET2 to drive DNA demethylation during alternative macrophage and monocyte differentiation [#47, #50, #52]. EGR2 activity is further tuned post-translationally by GCN5-mediated acetylation, which enhances its transcriptional output, and by AIP2-mediated ubiquitination, which targets it for proteasomal degradation [#43, #29]. Dominant EGR2 mutations cause peripheral neuropathy by attenuating SOX10 binding at cooperative myelin-gene regulatory sites, and disruption of the EGR2-NAB interaction causes congenital hypomyelinating neuropathy in mouse models [#23, #25].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Established how EGR2 itself is induced, placing it within the immediate-early serum-response network rather than treating it only as a downstream effector.\",\n      \"evidence\": \"Promoter deletion/mutagenesis and gel-shift identifying a c-fos-like SRE/CArG element, refined to CArG-1 with PKC-dependent and -independent inputs\",\n      \"pmids\": [\"2496302\", \"2111009\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the downstream targets EGR2 regulates\", \"Splice variants with distinct N-termini not functionally distinguished\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Showed EGR2 is a direct, sequence-specific activator of segmentation genes and is genetically essential for hindbrain patterning, defining its first developmental program.\",\n      \"evidence\": \"In vitro binding to HoxB2 r3/r5 enhancer sites with transgenic reporter validation, plus zinc-finger-domain knockout producing loss of rhombomeres 3 and 5\",\n      \"pmids\": [\"8093858\", \"8224839\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors mediating activation versus repression not yet defined\", \"How segment-restricted EGR2 expression itself is established left open\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Generalized EGR2 as a direct activator of multiple group-2 Hox enhancers and introduced NAB corepressors as a mechanism for differential, family-specific regulation of EGR activity.\",\n      \"evidence\": \"In vitro binding plus transgenic enhancer mutagenesis for Hoxa2; yeast two-hybrid and reporter assays defining NAB1/NAB2 binding to the EGR R1 inhibitory domain\",\n      \"pmids\": [\"8625806\", \"7624335\", \"8668170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular machinery recruited by NAB to repress was not yet known\", \"NAB interaction studied for NGFI-A; EGR2-specific consequences not fully resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the upstream cis-regulatory architecture and combinatorial cofactor logic that position EGR2 within both the hindbrain and Schwann-cell transcription cascades.\",\n      \"evidence\": \"Transgenic reporter analysis of Schwann-cell ISE/MSE elements requiring Oct6, and enhancer mutagenesis showing Krox20/kreisler synergy on the Hoxb3 r5 enhancer\",\n      \"pmids\": [\"11782409\", \"11823429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical contact between EGR2 and these upstream factors not all demonstrated\", \"Temporal switching between ISE and MSE control not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Extended EGR2 function beyond development to cell-fate outcomes including apoptosis, adipogenesis, and neural-crest autoregulation, and identified coactivators that boost its transactivation.\",\n      \"evidence\": \"HCF-1 coactivator interaction mapping; microarray plus functional assays for BNIP3L/BAK apoptotic targets; transgenic NCE analysis showing SOX10 synergy and direct autoregulation\",\n      \"pmids\": [\"14532282\", \"12687019\", \"12538520\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"HCF-1 and apoptotic-target findings from single labs without genetic confirmation\", \"Physiological relevance of EGR2-driven apoptosis in vivo not established\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated EGR2 directly occupies myelin gene loci in native tissue and partners with SOX10 and SREBP, formalizing it as the transcriptional driver of the myelination program.\",\n      \"evidence\": \"In vivo ChIP at the Mpz intronic element with transactivation and SOX10 synergy assays, plus reporter assays for SREBP target co-activation\",\n      \"pmids\": [\"16373334\", \"16054051\", \"15836632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide binding repertoire not yet defined\", \"Mechanism of EGR2-SOX10 cooperativity at chromatin not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Opened EGR2's immunological role by identifying it as a negative regulator of T-cell activation and tolerance acting through Cbl-b.\",\n      \"evidence\": \"Overexpression and Egr3 knockout mice with in vivo peptide-tolerance assays and Cbl-b expression analysis\",\n      \"pmids\": [\"15834410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct EGR2 binding to immune target promoters not yet shown\", \"EGR2 versus EGR3 specific contributions not separated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed EGR2 is required to maintain, not merely initiate, the differentiated myelinating state and operates within a defined POU/SOX upstream cascade and antagonistic JNK signaling.\",\n      \"evidence\": \"Adult conditional Krox20 knockout causing demyelination; in vivo ChIP at MBP/MAG/Dhh; MSE transactivation by Oct6/Brn2; gain-of-function JNK pathway suppression\",\n      \"pmids\": [\"16988048\", \"16923174\", \"16311519\", \"14757751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How EGR2 mechanistically inactivates JNK beyond JIP-1 upregulation not fully resolved\", \"Direct versus indirect maintenance targets not distinguished\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Provided the mechanistic basis for dominant EGR2-linked peripheral neuropathy, showing pathogenic mutants poison SOX10 cooperativity rather than EGR2 DNA binding.\",\n      \"evidence\": \"ChIP and reporter assays with neuropathy-associated EGR2 mutants at Mpz and MAG cooperative elements\",\n      \"pmids\": [\"17325040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of EGR2-SOX10 interaction not determined\", \"Genotype-phenotype correlation across mutation classes not addressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the molecular machinery of EGR2-mediated repression and proved the EGR2-NAB interaction is physiologically required, linking it to human hypomyelinating neuropathy.\",\n      \"evidence\": \"In vivo ChIP showing Egr2/NAB2 co-occupancy and CHD4/NuRD recruitment at Id2/Id4; I268F NAB-interaction knock-in mouse causing severe hypomyelination\",\n      \"pmids\": [\"18456662\", \"18524893\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Target-specific switching between NAB activation and repression functions unresolved\", \"How NuRD recruitment is targeted to specific loci not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Expanded EGR2's immune and regulatory network through thymic survival control, MeCP2 cross-regulation, and broader developmental roles.\",\n      \"evidence\": \"Egr2 knockout with Bcl-2 rescue in positive selection; reciprocal ChIP/knockdown of EGR2 and MeCP2\",\n      \"pmids\": [\"19017967\", \"19000991\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MeCP2 cross-regulation from a single lab without genetic confirmation\", \"Direct versus indirect control of Bcl-2 not fully resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified post-translational degradation control of EGR2 by AIP2, linking EGR2 protein turnover to activation-induced T-cell death.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, and AIP2 siRNA with apoptosis readouts\",\n      \"pmids\": [\"19651900\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo physiological role of AIP2-EGR2 axis not established\", \"Ubiquitination site on EGR2 not mapped\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established EGR2 as a profibrotic effector downstream of TGF-\\u03b2/Smad3 and a direct regulator of collagen/tendon programs, broadening its mesenchymal roles.\",\n      \"evidence\": \"ChIP and reporter assays at Col1a1 with chick gain-of-function and Egr1/Egr2 mouse mutants; Smad3-dependent reporter and gain/loss-of-function in fibroblasts\",\n      \"pmids\": [\"21173153\", \"21514423\", \"20506119\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"TGF-\\u03b2 fibrosis findings from single labs\", \"Distinct contributions of EGR1 versus EGR2 not fully separated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Genome-wide and genetic studies redefined EGR2 as a bidirectional, context-dependent regulator coordinating myelination, NKT lineage specification, and cytokine-signaling balance.\",\n      \"evidence\": \"EGR2/SOX10 ChIP-seq in myelinating nerve; ChIP-seq plus conditional KO for Zbtb16/Il2rb in NKT precursors; double-KO defining SOCS1/3 and Batf control\",\n      \"pmids\": [\"22492709\", \"22306690\", \"23021953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of EGR2 acting as activator versus repressor at a given locus not resolved\", \"Chromatin-state requirements for context-dependence not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established EGR2 as a controller of the T-cell expansion-versus-differentiation checkpoint and resolved how upstream signaling tunes its Schwann-cell expression.\",\n      \"evidence\": \"ChIP and gain/loss-of-function defining Myc/Myb/Bcl6/Id3/Zeb2 control; Rac1-MKK7-JNK pathway dissection downregulating Krox20 in Schwann cells\",\n      \"pmids\": [\"28487311\", \"23505039\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rac1-Krox20 axis from a single lab\", \"How sustained versus transient EGR2 levels are set in vivo not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed EGR2's dual immunological character, acting as a positive regulator of naive T-cell differentiation versus a negative regulator in activated cells, via direct control of Tbx21 and Notch1.\",\n      \"evidence\": \"Conditional KO with T-helper differentiation assays, direct target identification, and viral infection model\",\n      \"pmids\": [\"25368162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular switch governing positive versus negative activity not defined\", \"Direct binding sites at all cytokine loci not mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined post-translational and protein-interaction layers controlling EGR2 immune output, including GCN5 acetylation enhancing activity and direct T-bet sequestration blocking Th1 differentiation, plus Treg-derived TGF-\\u03b23 control.\",\n      \"evidence\": \"Acetyltransferase assays with conditional KO in iNKT; co-IP and DNA-binding inhibition assays for T-bet; double-KO and adoptive transfer for Ltbp3/TGF-\\u03b23\",\n      \"pmids\": [\"28723564\", \"28455436\", \"27911796\", \"28487311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetylation sites and their stoichiometry not fully mapped\", \"Balance between DNA-dependent and protein-sequestration modes of EGR2 action not quantified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified EGR2 as an epigenetic pioneer in macrophage polarization and defined the activating chromatin machinery and looping control it relies on.\",\n      \"evidence\": \"ChIP-seq/ATAC-seq plus conditional KO and TET2 co-IP downstream of IL-4/STAT6; Rnf40/H2Bub1 recruitment in Schwann cells; CTCF looping and SUZ12 interaction controlling EGR2\",\n      \"pmids\": [\"33060136\", \"32672815\", \"32807777\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How EGR2 selects activating versus repressive chromatin partners not resolved\", \"Direct structural basis of TET2 recruitment not determined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Consolidated EGR2 as a DNA-demethylation pioneer across myeloid differentiation, a driver of cellular senescence, an alveolar-macrophage identity factor, and an enabler of T-cell exhaustion.\",\n      \"evidence\": \"Genome-wide methylation/ATAC/ChIP-seq with TET2 co-IP in monocytes; ChIP and gain/loss-of-function at ARF/p16; conditional KO in alveolar macrophages and exhausted CD8 T cells\",\n      \"pmids\": [\"33692344\", \"33547862\", \"34797692\", \"33986293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Senescence role from a single lab\", \"How the same EGR2-TET2 module yields distinct lineage outcomes not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a therapeutically actionable EGR2-type I interferon axis driving CAR T-cell dysfunction.\",\n      \"evidence\": \"CRISPR EGR2 knockout in CAR T cells with interferon-\\u03b2 rescue and in vivo tumor models\",\n      \"pmids\": [\"37011008\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct EGR2 targets within the interferon program not fully mapped\", \"Whether EGR2 acts upstream or within the interferon feedback loop not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"What molecular determinant dictates whether EGR2 functions as an activator, a repressor, an epigenetic pioneer, or a protein sequestering factor at a given locus and cell type remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified rule linking cofactor composition (SOX10, NAB/NuRD, Rnf40, TET2, T-bet) to functional output\", \"Structural basis of EGR2 cooperativity and protein sequestration undetermined\", \"Post-translational code (acetylation, ubiquitination) integration with cofactor choice unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 6, 15, 24, 34, 36, 38, 47]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 6, 15, 21, 34, 36]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [42]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 15, 24, 36, 47]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 15, 24, 36, 47]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 8, 20, 30]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [18, 34, 37, 38, 40, 49, 54]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [24, 47, 48, 50]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SOX10\", \"NAB1\", \"NAB2\", \"TET2\", \"TBX21\", \"GCN5\", \"AIP2\", \"CHD4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}