{"gene":"EGR3","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1991,"finding":"EGR3 encodes a 387 amino acid zinc-finger transcription factor with three Cys2-His2 zinc fingers that can activate transcription of a CAT reporter gene linked to the cis element CGCCCCCGC, the same target sequence recognized by EGR1 and EGR2. EGR3 is induced as an immediate-early gene by mitogenic stimulation.","method":"CAT reporter assay, low-stringency hybridization cloning, Northern blot","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro transcriptional activation assay with defined cis-element, single lab but multiple orthogonal methods (reporter assay, sequence analysis, expression profiling)","pmids":["1906159"],"is_preprint":false},{"year":1994,"finding":"Egr3/Pilot is rapidly and transiently induced in hippocampal and cortical neurons by electroconvulsive seizure, NMDA receptor activation, and dopamine-altering drugs; it binds the same consensus DNA sequence as Egr1/zif268 and the two proteins are co-expressed in the same neurons, suggesting competitive or cooperative transcriptional regulation at shared target sites.","method":"Differential cDNA cloning, Northern blot, gel shift (EMSA) for DNA binding, in situ hybridization, pharmacological manipulations","journal":"Learning & Memory","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — EMSA demonstrated sequence-specific DNA binding; multiple orthogonal methods (cloning, expression, DNA binding); single lab","pmids":["10467592"],"is_preprint":false},{"year":1998,"finding":"Egr3 is essential for muscle spindle morphogenesis: Egr3-deficient mice lack muscle spindles entirely. Egr3 is expressed specifically in developing intrafusal myotubes (not in Ia afferent neurons) after innervation by sensory afferents, indicating that Egr3-mediated transcription in myotubes is required for spindle induction.","method":"Gene targeting (knockout mice), histology, in situ hybridization, nerve transection experiments","journal":"Nature Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean germline KO with specific developmental phenotype (absence of spindles), expression localization, replicated by subsequent studies","pmids":["9731539"],"is_preprint":false},{"year":1998,"finding":"EGR3 expression in T cells (but not fibroblasts) is driven by a 27-bp promoter element that binds NF-ATp and NF-ATc, making it sensitive to cyclosporin A (CsA) inhibition of calcineurin/NF-AT signaling. In fibroblasts, different CsA-insensitive promoter regions drive EGR3 expression, and insufficient NF-ATp levels explain the lack of this element's activity there.","method":"Promoter deletion analysis, EMSA, transient transfection reporter assays, NF-ATp overexpression in fibroblasts","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — detailed promoter dissection with mutagenesis, EMSA, and gain-of-function rescue in a single rigorous study","pmids":["9819402"],"is_preprint":false},{"year":1998,"finding":"Following electroconvulsive stimulation in hippocampal granule cells, Egr1 protein peaks at 0.5–1 h and decays by 4 h, whereas Egr3 protein peaks at 4 h; their DNA-binding activities follow the same sequential pattern, indicating they mediate early and late phases, respectively, of transcriptional responses at their shared consensus element.","method":"Western blot, gel shift assay (EMSA), electroconvulsive stimulation in vivo","journal":"Journal of Neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and protein-level time courses in vivo; single lab, two orthogonal methods","pmids":["9489747"],"is_preprint":false},{"year":2001,"finding":"Egr3 is required for intrafusal fiber differentiation and spindle maintenance after birth: in Egr3-deficient mice, myotubes are initially innervated by Ia afferents and begin spindle assembly, but fail to express slow-developmental myosin heavy chain, form thin capsules, and after birth the sensory and motor innervation withdraws and spindles disassemble. Egr3 expression in myotubes is controlled by innervation (lost after nerve transection).","method":"Egr3 KO analysis, immunohistochemistry, in situ hybridization, nerve transection","journal":"Developmental Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — detailed spatiotemporal KO phenotype analysis with multiple markers, replicated findings from the 1998 paper in a follow-up study","pmids":["11401400"],"is_preprint":false},{"year":2004,"finding":"EGR3 is a direct transcriptional target of estrogen receptor alpha (ERα) in breast cancer MCF-7 cells; EGR3 in turn transcriptionally induces NAB2 and FasL. Cycloheximide and ICI 182,780 (ERα antagonist) block EGR3 induction, confirming it is a primary ERα target.","method":"Northern blot, cycloheximide/ICI 182,780 treatment, stable transfection with inducible EGR3, microarray, reporter assay","journal":"Journal of Molecular Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition of ER plus functional downstream target identification; single lab, multiple methods","pmids":["15171706"],"is_preprint":false},{"year":2005,"finding":"Egr3 directly up-regulates GABRA4 promoter activity in hippocampal neurons, and Egr3 knockout mice have ~50% less GABRA4 mRNA in hippocampus. After pilocarpine-induced status epilepticus, Egr3 binds to the GABRA4 promoter (shown by ChIP) and both GABRA4 and alpha4 subunit protein are increased, establishing Egr3 as a transcriptional regulator of GABRA4 in epilepsy.","method":"Reporter gene transfection in primary hippocampal neurons, Egr3 KO mice, ChIP, in vivo seizure model","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP confirmed in vivo binding; reporter assays; KO validation; multiple orthogonal methods in one study","pmids":["16091474"],"is_preprint":false},{"year":2005,"finding":"Egr2 and Egr3 function as negative regulators of T cell activation and promote anergy by inducing expression of the E3 ubiquitin ligase Cbl-b. Egr3-deficient T cells have reduced Cbl-b expression and are resistant to peptide-induced tolerance in vivo.","method":"Microarray, overexpression in T cells, Egr3 KO mice, in vivo tolerance assay","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO phenotype plus gain-of-function plus target gene validation; replicated in subsequent studies","pmids":["15834410"],"is_preprint":false},{"year":2006,"finding":"Egr3 is transiently induced by pre-TCR signaling in thymocytes and promotes a distinct proliferative phase by reducing E protein-dependent RORγt expression and physically interacting with RORγt to prevent induction of RORγt target genes. After Egr3 levels subside, RORγt activity increases to promote gene rearrangement.","method":"Genetic epistasis (RORγt, Egr3, E protein manipulation), thymocyte proliferation assays, protein interaction studies","journal":"Immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional epistasis and protein interaction demonstrated; single lab","pmids":["16782036"],"is_preprint":false},{"year":2007,"finding":"Egr3 is required for normal hippocampal long-term potentiation (LTP) — both early and late phase — and for hippocampal and amygdala-dependent short-term and long-term learning and memory, independently of Egr1 (Egr1 protein levels are unchanged in Egr3 KO brain).","method":"Egr3 KO mice, electrophysiological LTP recordings, behavioral memory tests (fear conditioning, etc.), Western blot for Egr1","journal":"Molecular and Cellular Neurosciences","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with specific electrophysiological and behavioral phenotypes, distinguishing Egr3 from Egr1 function","pmids":["17350282"],"is_preprint":false},{"year":2008,"finding":"Egr3 is induced by NGF signaling in sympathetic neurons and is required for their normal terminal axon extension and branching in target tissues, but not for neuron survival. Egr3-deficient mice have severe sympathetic target tissue innervation abnormalities and physiological dysautonomia.","method":"Egr3 KO mice, immunohistochemistry, physiological autonomic function assays, NGF treatment","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with specific innervation and physiological phenotypes; downstream pathway (NGF→Egr3) established; replicated by subsequent neuron-specific ablation study","pmids":["18653557"],"is_preprint":false},{"year":2010,"finding":"EGR1, EGR2, and EGR3 all activate NAB2 transcription through similar cis-regulatory elements in melanoma and carcinoma cells, establishing a negative feedback loop (NAB2 represses EGR-induced transcription). EGR3 depletion by siRNA reduces endogenous NAB2 levels; EGR3 also regulates EGR2 expression.","method":"siRNA knockdown, reporter assays, kinetic expression studies","journal":"Journal of Cellular Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assays and siRNA knockdown; single lab, multiple methods","pmids":["20506119"],"is_preprint":false},{"year":2011,"finding":"BDNF increases NMDA receptor NR1 subunit levels in cortical neurons via MAPK pathway activation of TrkB, and this NR1 transcription is controlled by binding of both CREB and Egr3 to the core NR1 promoter region.","method":"BDNF treatment of rat cortical neurons, reporter assays, MAPK pathway inhibition, protein expression analysis","journal":"Journal of Neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter binding and pathway inhibition experiments; single lab","pmids":["22035109"],"is_preprint":false},{"year":2011,"finding":"EGR3 binds to the promoter of TREM-1 in monocytes as demonstrated by ChIP, indicating that EGR3 directly regulates TREM-1 gene expression.","method":"In silico binding site prediction and in vivo ChIP assay","journal":"Brain, Behavior, and Immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP confirmed in vivo promoter binding; single lab, single method for binding","pmids":["21421043"],"is_preprint":false},{"year":2012,"finding":"Deletion of both Egr2 and Egr3 in lymphocytes causes lethal autoimmunity with hyperactive STAT1/STAT3 and impaired antigen receptor-induced AP-1 activation. Egr2 and/or Egr3 directly induce expression of SOCS1 and SOCS3 (inhibitors of STAT1/STAT3), and block function of Batf (an AP-1 inhibitor).","method":"Conditional double KO mice, cytokine profiling, STAT phosphorylation assays, promoter analysis, ChIP","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — double KO with specific molecular mechanism (SOCS1/SOCS3 direct targets) confirmed by ChIP; multiple orthogonal methods","pmids":["23021953"],"is_preprint":false},{"year":2013,"finding":"Egr3 has a sympathetic neuron-autonomous role: isolated Egr3-deficient sympathetic neurons have neurite outgrowth defects in response to NGF, and neuron-specific Egr3 ablation recapitulates the target tissue innervation abnormalities of germline KO. Microarray identified target genes involved in axonogenesis, dendritogenesis, and axon guidance; Egr3 specifically regulates dendrite morphology and terminal axon branching.","method":"Cre-mediated sympathetic neuron-specific KO, primary neuron culture with NGF, microarray, genetic neuronal labeling","journal":"Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-type-specific KO with primary culture phenotype and microarray target identification; multiple orthogonal methods","pmids":["23467373"],"is_preprint":false},{"year":2013,"finding":"NRG1 signaling induces Egr3 transcription in muscle cells through a composite SRF-CREB regulatory element in the Egr3 promoter. NRG1 targets SRF by stimulating nuclear translocation of MRTF-A and MRTF-B coactivators, and phosphorylates CREB. The Erk1/2 MAP kinase is required upstream of CREB phosphorylation for NRG1-induced Egr3 transcription.","method":"Reporter assays with promoter deletions/mutations, MRTF nuclear translocation assays, CREB phosphorylation assays, ERK inhibition in cultured muscle cells and in vivo immunostaining at spindles","journal":"Experimental Cell Research / Journal of Neuroscience Research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — detailed promoter mutagenesis, coactivator translocation, kinase inhibition; two papers from same lab with converging mechanistic results","pmids":["23318675","24272970"],"is_preprint":false},{"year":2014,"finding":"Egr3 protein co-localizes with the meiotic spindle and cytosolic microtubule organizing centers (MTOCs) in mouse oocytes, accumulating around γ-tubulin. Nocodazole-induced microtubule depolymerization disrupts Egr3 localization. However, in vitro microtubule interaction assay showed Egr3 does NOT directly bind polymerized microtubules, suggesting an indirect association with MTOCs.","method":"Immunofluorescence with Egr3-specific antibodies, co-localization with γ-tubulin, nocodazole treatment, in vitro microtubule binding assay","journal":"PloS One","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct localization with functional perturbation (nocodazole) and negative in vitro binding result; single lab","pmids":["24722338"],"is_preprint":false},{"year":2014,"finding":"Egr3 promotes γδ T cell development in the thymus: Egr3 transgenic (overexpressing) mice show a marked increase in peripheral γδ T cells, and thymocytes from these mice are biased toward γδ T cell development. Egr3-induced γδ T cells promote Th17 differentiation when co-cultured with wildtype CD4+ T cells.","method":"Egr3 transgenic mice, flow cytometry, thymocyte differentiation assays, co-culture experiments, bleomycin lung inflammation model","journal":"PloS One","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function transgenic with specific cellular phenotype and functional co-culture validation; single lab","pmids":["24475259"],"is_preprint":false},{"year":2015,"finding":"Egr3 has a skeletal muscle cell-autonomous role in intrafusal fiber differentiation: cell-specific Egr3 ablation in muscle blocks myotube development after Ia-afferent contact, producing shortened 'spindle remnants' that lack fusimotor innervation and fail to express GDNF (required for fusimotor neuron survival), but retain NT3 expression and Ia-afferent innervation.","method":"Conditional (muscle-specific) Egr3 KO, genetic lineage tracing, immunohistochemistry for MyHC, NT3, GDNF","journal":"Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO definitively placing Egr3 in muscle (not sensory neurons or Schwann cells); multiple molecular markers","pmids":["25855173"],"is_preprint":false},{"year":2015,"finding":"Egr3 has opposing roles in nucleus accumbens MSN subtypes in cocaine action: repeated cocaine induces Egr3 in D1-MSNs and reduces it in D2-MSNs. Overexpression of Egr3 in D1-MSNs enhances cocaine reward and locomotion, while overexpression in D2-MSNs blunts these behaviors. Cocaine alters Egr3 binding to promoters of downstream genes including Camk2α, CREB, FosB, Nr4a2, Sirt1 (increased binding in D1-MSNs) and G9a, Dnmt3a (decreased binding).","method":"RiboTag cell-type-specific transcriptomics, Cre-inducible AAV overexpression/knockdown, D1-Cre and D2-Cre mice, ChIP","journal":"Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-type-specific gain- and loss-of-function with behavioral readouts plus ChIP for downstream targets; multiple orthogonal approaches","pmids":["25995477"],"is_preprint":false},{"year":2015,"finding":"Egr3 is required for sleep-deprivation-induced expression of Htr2a (serotonin 2A receptor) in mouse cortex: sleep deprivation induces a 2-fold increase in Htr2a mRNA in wildtype but not Egr3-/- mice.","method":"Egr3 KO mice, sleep deprivation, qPCR for Htr2a mRNA","journal":"ACS Chemical Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean KO with specific gene expression phenotype; single lab, limited mechanistic follow-up in this paper","pmids":["25857407"],"is_preprint":false},{"year":2016,"finding":"Egr2 and Egr3 in T cells cooperatively prevent humoral autoimmunity by supporting TGF-β3 secretion from CD4+CD25-LAG3+ regulatory T cells. Egr2 and Egr3 maintain expression of Ltbp3 (latent TGF-β binding protein 3), which is required for TGF-β3 production; Egr2/3 double KO completely ablates TGF-β3 production from these cells.","method":"T cell-specific Egr2/Egr3 double KO mice, adoptive transfer, TGF-β3-expressing vector treatment, Ltbp3 expression analysis","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Moderate — double conditional KO with specific mechanistic pathway (Ltbp3→TGF-β3) and rescue experiments; single lab but multiple methods","pmids":["27911796"],"is_preprint":false},{"year":2016,"finding":"Egr3 promotes myoblast proliferation and survival: shRNA inhibition of Egr3 in C2C12 cells impairs proliferation rate, reduces NF-κB transcriptional activity, increases apoptotic markers (annexin V+, caspase-3/7, PARP), and the proliferation deficit is partially rescued by pan-caspase inhibitor Z-VAD-FMK.","method":"shRNA knockdown in C2C12 cells, NF-κB reporter assay, apoptosis assays (annexin V, caspase activity), caspase inhibitor rescue","journal":"Journal of Cellular Physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular phenotype and pathway (NF-κB/caspase) and pharmacological rescue; single lab","pmids":["27576048"],"is_preprint":false},{"year":2017,"finding":"KSRP decreases EGR3 mRNA stability in an ARE-independent manner via miR-23a: KSRP facilitates miR-23a biogenesis, miR-23a directly binds EGR3 3'UTR reducing EGR3 expression, and EGR3 acts downstream of KSRP to promote NSCLC cell mobility and metastasis.","method":"KSRP overexpression/knockdown in NSCLC cells, microarray, miRNA screening, 3'UTR reporter assay, in vivo metastasis model","journal":"Biochimica et Biophysica Acta - Gene Regulatory Mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3'UTR luciferase validation plus in vivo metastasis model; single lab","pmids":["28847731"],"is_preprint":false},{"year":2018,"finding":"Egr3 is required for ECS-induced hippocampal expression of Bdnf: ECS induces high-level Bdnf expression in WT hippocampus (including exons IV and VI), but this induction is absent in Egr3-/- mice. The Bdnf promoter contains eight putative EGR3 binding sites, suggesting direct regulation.","method":"Egr3 KO mice, ECS, expression microarray, qRT-PCR, in situ hybridization, Bdnf promoter bioinformatics","journal":"Frontiers in Behavioral Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with specific downstream gene (Bdnf) phenotype replicated across cohorts; promoter binding not confirmed by ChIP in this paper","pmids":["29867393"],"is_preprint":false},{"year":2018,"finding":"EGR3 is a transcriptional regulator of late epidermal differentiation: EGR3 is highly expressed in the stratum granulosum, activates enhancers and drives expression of genes in the epidermal differentiation complex (including filaggrin, loricrin, involucrin targets), and 20 EGR3-specific late differentiation targets were identified. EGR3 expression is lost in parakeratotic lesional skin.","method":"Immunohistochemistry, RNA-seq, ChIP-seq for enhancer analysis, enhancer RNA detection, weighted gene co-expression network analysis","journal":"Journal of Investigative Dermatology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP-seq for enhancer binding combined with transcriptomic target identification; single lab but multiple orthogonal genomic methods","pmids":["30342896"],"is_preprint":false},{"year":2019,"finding":"EGR3 sex-specifically regulates cocaine relapse: EGR3 protein is reduced only in female rodents after 20 days of forced abstinence from cocaine self-administration. Egr3 overexpression in NAc D2-MSNs during forced abstinence facilitates extinction and blunts drug-induced reinstatement in female mice but has the opposite effect in male mice.","method":"Intravenous cocaine self-administration, Western blot for EGR3 protein, virally mediated Egr3 overexpression via A2A-Cre, operant behavioral testing","journal":"Biological Psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific gain-of-function with behavioral outcomes in both sexes; single lab","pmids":["31858986"],"is_preprint":false},{"year":2020,"finding":"EGR3 transcriptionally activates ZFP36, GADD45B, and SOCS3 by directly binding to their promoter regions, and suppresses EMT and cell migration/invasion in prostate cancer cells; EGR3 overexpression suppresses bone metastasis in mouse models.","method":"ChIP assay, luciferase reporter assay, EGR3 overexpression/knockdown in prostate cancer cells, mouse bone metastasis model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP confirmed direct promoter binding of multiple targets; in vivo metastasis model; single lab with multiple orthogonal approaches","pmids":["32796959"],"is_preprint":false},{"year":2020,"finding":"EGR3 directly binds the RELN (Reelin) promoter and activates RELN expression; EGR3 overexpression reduces neurite outgrowth in SH-SY5Y cells, an effect partially reversed by RELN knockdown, placing RELN downstream of EGR3 in neurite outgrowth regulation.","method":"ChIP, luciferase reporter assay, EGR3 overexpression/RELN knockdown in SH-SY5Y cells, neurite outgrowth quantification, microarray + IPA","journal":"Journal of Neurochemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ChIP and reporter assay confirmed direct transcriptional regulation; epistasis by RELN knockdown rescue; single lab","pmids":["33113163"],"is_preprint":false},{"year":2020,"finding":"miR-27a-5p inhibits cardiac fibrosis by suppressing EGR3 expression: miR-27a-5p targets EGR3 3'UTR (validated by reporter assay), and EGR3 suppression reduces TGF-β signaling and pro-fibrotic protein secretion in cardiac fibroblasts. In vivo, miR-27a-5p attenuates TAC-induced cardiac fibrosis.","method":"In silico Venn analysis, luciferase reporter assay, TAC mouse model, miR-27a KO and antisense inhibition, cardiac fibroblast culture","journal":"Journal of Cellular and Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay validation plus in vivo TAC model; single lab","pmids":["33215816"],"is_preprint":false},{"year":2021,"finding":"EGR3 is necessary for allergic inflammation: NF-κB p65 directly regulates EGR3 expression (binding to EGR3 promoter), and EGR3 in turn directly binds the HDAC6 promoter to increase HDAC6 expression, forming an EGR3-HDAC6-IL-27 signaling axis that mediates mast cell-dependent allergic responses and passive anaphylaxis. miR-182-5p is a direct negative regulator of EGR3 (validated by luciferase assay).","method":"RNA-seq, ChIP for NF-κB p65 on EGR3 promoter, ChIP for EGR3 on HDAC6 promoter, luciferase assay for miR-182-5p/EGR3 interaction, passive cutaneous and systemic anaphylaxis models","journal":"Frontiers in Immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple ChIP experiments confirming direct transcriptional regulation at two levels; luciferase validation; in vivo anaphylaxis models; single lab with multiple orthogonal methods","pmids":["34234781"],"is_preprint":false},{"year":2021,"finding":"Cocaine exposure enhances Egr3 binding to promoters of nuclear genes involved in mitochondrial dynamics (PGC1α, Drp1) in D1-MSNs; blunting Egr3 in D1-MSNs blocks cocaine-mediated enhancement of PGC1α and Drp1 expression and attenuates cocaine-induced enhancement of small-sized mitochondria.","method":"ChIP in NAc tissue, virally mediated Egr3 knockdown in D1-MSNs, mRNA quantification, mitochondrial morphology analysis (electron microscopy)","journal":"Molecular Brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for Egr3 binding at target promoters combined with cell-type-specific loss-of-function and morphological readout; single lab","pmids":["34187517"],"is_preprint":false},{"year":2022,"finding":"EGR3 directly regulates Htr2a (5-HT2AR) expression: ChIP in mouse frontal cortex demonstrated EGR3 protein binding to the Htr2a promoter in vivo, and EGR3 drives Htr2a reporter expression via two EGR3 binding sites. Sleep deprivation-induced upregulation of 5-HT2AR requires Egr3, as it does not occur in Egr3-/- mice.","method":"Egr3 KO mice, sleep deprivation, ChIP in vivo, luciferase reporter assay with EGR3 binding site mutations, qPCR and protein quantification","journal":"Molecular Psychiatry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vivo ChIP confirmed promoter binding, reporter assay with site mutagenesis confirmed functional sites, KO phenotype confirmed requirement; multiple orthogonal methods","pmids":["35001075"],"is_preprint":false},{"year":2022,"finding":"Egr3 is required for activity-dependent expression of DNA damage response genes (Gadd45b, Gadd45g) and AP-1 family genes (Fos, Fosb), as well as Mef2c and Calb2, in the hippocampus following ECS. These genes are differentially expressed between WT and Egr3-/- mice after seizure.","method":"Expression microarray on hippocampi of WT vs Egr3-/- mice after ECS, bioinformatics/Enrichr pathway analysis","journal":"Translational Psychiatry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — KO transcriptomics identified downstream targets; single lab but replicated core Egr3-dependent gene finding (Bdnf) and extended to new targets","pmids":["35941129"],"is_preprint":false},{"year":2023,"finding":"EGR3 directly binds to the MCL1 promoter to activate its transcription, and this EGR3-MCL1 axis confers tamoxifen resistance in ERα-positive breast cancer cells by suppressing apoptosis. Estrone upregulates EGR3 expression in tamoxifen-resistant cells.","method":"ChIP, dual luciferase assay, EGR3 overexpression/knockdown, apoptosis assays (CCK8, colony formation, flow cytometry), Western blot","journal":"Journal of Cancer Research and Clinical Oncology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ChIP and luciferase assay confirmed direct promoter binding; functional rescue with apoptosis assays; single lab","pmids":["37999751"],"is_preprint":false},{"year":2024,"finding":"EGR3 functions as a conserved mechanosensitive transcription factor required for cardiac valve morphogenesis: egr3 null zebrafish completely lack valve leaflets, leading to blood regurgitation. EGR3 acts cell-autonomously in endothelial cells, and one downstream effector is the nuclear receptor Nr4a2b. Mechanical forces upregulate egr3/EGR3 expression in zebrafish heart, porcine valvular endothelial cells, and during human aortic valve remodeling.","method":"egr3 null zebrafish (CRISPR), tissue-specific loss- and gain-of-function tools, live imaging of valve morphogenesis, in vitro mechanostimulation of porcine valvular endothelial cells","journal":"Science Advances","confidence":"High","confidence_rationale":"Tier 2 / Moderate — complete null phenotype, cell-autonomous function established by tissue-specific tools, effector identified, mechanosensitivity validated across three systems; single lab but multiple model systems","pmids":["38748804"],"is_preprint":false},{"year":2024,"finding":"EGR3 negatively regulates adipogenesis: EGR3 is downregulated by cortisol in adipose tissue of obese subjects and high-fat-diet mice. EGR3 suppresses adipogenesis and lipogenesis in hADSCs and 3T3-L1 cells via transcriptional regulation of HDAC6 (a downstream target gene and negative regulator of adipogenesis).","method":"EGR3 overexpression/knockdown in hADSCs and 3T3-L1 cells, cortisol treatment, ChIP/reporter analysis of HDAC6 as EGR3 target","journal":"Cell Death Discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with cellular phenotype and downstream target identification; single lab","pmids":["38467615"],"is_preprint":false}],"current_model":"EGR3 is a zinc-finger transcription factor that binds the consensus GC-rich element CGCCCCCGC to activate or repress target gene transcription in response to diverse signals including NGF, NRG1 (via ErbB/ERK/CREB/SRF), BDNF, estrogen, mechanical forces, and synaptic/neuronal activity; it functions as an immediate-early gene regulator of muscle spindle morphogenesis (in intrafusal myotubes downstream of NRG1-ErbB signaling), sympathetic neuron axon branching (downstream of NGF), T cell anergy and autoimmunity (via induction of Cbl-b, SOCS1/3, Ltbp3/TGF-β3, and suppression of Batf), hippocampal LTP and memory, cardiac valve morphogenesis (as a mechanosensitive endothelial transcription factor driving Nr4a2b), late epidermal differentiation, and cocaine-mediated neuroplasticity in NAc MSN subtypes, with its activity modulated by negative feedback through NAB2 and by upstream miRNAs (miR-23a, miR-27a, miR-182-5p, miR-200c-3p) that target its mRNA."},"narrative":{"mechanistic_narrative":"EGR3 is a Cys2-His2 zinc-finger immediate-early transcription factor that binds the GC-rich consensus element CGCCCCCGC—shared with EGR1/EGR2—to activate or repress target genes in response to mitogenic, neuronal-activity, and hormonal signals [PMID:1906159, PMID:10467592]. Its transcription is itself driven by signal-specific promoter inputs: an NF-AT-dependent 27-bp element confers calcineurin-sensitive induction in T cells [PMID:9819402], while NRG1 induces Egr3 in muscle through a composite SRF–CREB element via MRTF-A/B nuclear translocation and ERK1/2-dependent CREB phosphorylation [PMID:23318675, PMID:24272970]. In the nervous system EGR3 is a transient activity-induced regulator that, acting sequentially with EGR1, controls late-phase transcriptional responses and is required for hippocampal LTP and learning, for activity-dependent induction of Bdnf, GABRA4, and Htr2a, and—downstream of NGF—for sympathetic neuron terminal axon and dendrite branching [PMID:9489747, PMID:16091474, PMID:17350282, PMID:23467373, PMID:29867393, PMID:35001075]. In muscle EGR3 acts cell-autonomously within intrafusal myotubes as the essential transcriptional driver of muscle spindle morphogenesis and maintenance [PMID:9731539, PMID:11401400, PMID:25855173]. In the immune system EGR3 (with EGR2) restrains T cell activation and autoimmunity by inducing Cbl-b, SOCS1/SOCS3, and Ltbp3/TGF-β3 while blocking Batf [PMID:15834410, PMID:23021953, PMID:27911796]. EGR3 establishes a NAB2 negative-feedback loop and operates as a context-dependent activator or repressor across epidermal differentiation, cancer cell migration/metastasis, cocaine neuroplasticity in nucleus accumbens MSN subtypes, and mechanosensitive cardiac valve morphogenesis via Nr4a2b [PMID:20506119, PMID:25995477, PMID:30342896, PMID:32796959, PMID:38748804].","teleology":[{"year":1991,"claim":"Established EGR3's molecular identity by showing it is a zinc-finger immediate-early gene that binds the same GC-rich cis element as EGR1/EGR2 and activates transcription, defining it as a sequence-specific transcriptional activator.","evidence":"CAT reporter assay, cloning, and Northern blot defining the CGCCCCCGC target element","pmids":["1906159"],"confidence":"High","gaps":["No endogenous target genes identified at this stage","No tissue-specific function established"]},{"year":1994,"claim":"Placed EGR3 in neuronal activity-dependent transcription by showing rapid induction by seizure and NMDA signaling and co-expression with Egr1 at shared binding sites, raising the question of how the two EGR proteins divide labor.","evidence":"Differential cloning, EMSA DNA binding, in situ hybridization, and pharmacology in hippocampal/cortical neurons","pmids":["10467592"],"confidence":"High","gaps":["Whether Egr1 and Egr3 compete or cooperate at targets unresolved","No direct downstream neuronal target identified"]},{"year":1998,"claim":"Demonstrated a non-redundant developmental role: Egr3 is essential and cell-autonomous in intrafusal myotubes for muscle spindle morphogenesis, establishing EGR3 as a developmental master regulator downstream of innervation.","evidence":"Germline knockout mice, histology, in situ hybridization, and nerve transection","pmids":["9731539"],"confidence":"High","gaps":["Downstream transcriptional targets in myotubes not identified","Upstream innervation-derived signal unknown"]},{"year":1998,"claim":"Dissected signal-specific EGR3 promoter logic, showing T cell EGR3 induction depends on NF-ATp/NF-ATc binding a 27-bp element and is calcineurin/CsA-sensitive, while fibroblasts use distinct promoter inputs.","evidence":"Promoter deletion, EMSA, reporter assays, and NF-ATp overexpression rescue","pmids":["9819402"],"confidence":"High","gaps":["Functional consequence of NF-AT-driven EGR3 in T cells not yet defined","Cell-type specificity mechanism only partially resolved"]},{"year":1998,"claim":"Resolved the EGR1/EGR3 division of labor temporally by showing Egr1 mediates the early and Egr3 the late phase of seizure-induced transcription at the shared element.","evidence":"Western blot and EMSA time courses after electroconvulsive stimulation in vivo","pmids":["9489747"],"confidence":"Medium","gaps":["Single lab, in vivo only","Distinct late-phase target genes not yet identified"]},{"year":2001,"claim":"Refined the spindle phenotype to a postnatal differentiation/maintenance requirement, showing innervated myotubes initiate but fail to complete spindle assembly without Egr3.","evidence":"Spatiotemporal KO marker analysis, immunohistochemistry, nerve transection","pmids":["11401400"],"confidence":"High","gaps":["Direct EGR3 target genes governing myosin/capsule formation unknown"]},{"year":2004,"claim":"Connected EGR3 to hormone signaling, identifying it as a primary ERα target that in turn induces NAB2 and FasL in breast cancer cells.","evidence":"Northern blot, cycloheximide/ICI 182,780, inducible EGR3, microarray, reporter assay in MCF-7","pmids":["15171706"],"confidence":"Medium","gaps":["Direct promoter binding to NAB2/FasL not shown by ChIP here","Single lab"]},{"year":2005,"claim":"Provided first in vivo ChIP evidence of direct EGR3 target regulation, showing Egr3 binds and activates the GABRA4 promoter in hippocampus, linking EGR3 to neuronal GABA receptor expression in epilepsy.","evidence":"Reporter transfection, KO mice, ChIP, and pilocarpine seizure model","pmids":["16091474"],"confidence":"High","gaps":["Functional impact of altered GABRA4 on seizure behavior not fully resolved"]},{"year":2005,"claim":"Defined EGR3's immune function: with EGR2 it negatively regulates T cell activation and induces anergy via the E3 ligase Cbl-b, establishing EGR3 as a tolerance-promoting factor.","evidence":"Microarray, T cell overexpression, KO mice, and in vivo tolerance assay","pmids":["15834410"],"confidence":"High","gaps":["Direct Cbl-b promoter binding not definitively shown","Redundancy with Egr2 not separated"]},{"year":2006,"claim":"Revealed a non-transcriptional regulatory mode in thymocytes: Egr3 physically interacts with RORγt and reduces its activity to drive a proliferative phase of pre-TCR signaling.","evidence":"Genetic epistasis, proliferation assays, and protein interaction studies","pmids":["16782036"],"confidence":"Medium","gaps":["Structural basis of EGR3–RORγt interaction undefined","Single lab"]},{"year":2007,"claim":"Separated EGR3 from EGR1 functionally in cognition, showing Egr3 is required for hippocampal LTP and memory independently of unchanged Egr1 levels.","evidence":"KO mice, LTP electrophysiology, behavioral memory tests, Egr1 Western blot","pmids":["17350282"],"confidence":"High","gaps":["Synaptic target genes mediating the LTP defect not identified here"]},{"year":2008,"claim":"Established the NGF→Egr3 axis in sympathetic neurons required for terminal axon branching and autonomic function but not survival.","evidence":"KO mice, immunohistochemistry, autonomic physiology, NGF treatment","pmids":["18653557"],"confidence":"High","gaps":["Neuron-autonomous vs target-tissue contribution not yet separated","Direct axon-guidance targets unknown"]},{"year":2010,"claim":"Formalized the EGR–NAB2 negative-feedback loop, showing EGR3 (like EGR1/2) activates NAB2, which represses EGR-induced transcription, and that EGR3 also regulates EGR2.","evidence":"siRNA knockdown, reporter assays, kinetic expression in melanoma/carcinoma cells","pmids":["20506119"],"confidence":"Medium","gaps":["Quantitative dynamics of feedback in vivo unresolved","Single lab"]},{"year":2011,"claim":"Linked EGR3 to BDNF-driven synaptic plasticity, showing Egr3 and CREB co-regulate the NMDA NR1 subunit promoter downstream of TrkB/MAPK.","evidence":"BDNF treatment of cortical neurons, reporter assays, MAPK inhibition","pmids":["22035109"],"confidence":"Medium","gaps":["Direct EGR3 binding to NR1 promoter not confirmed by ChIP","Single lab"]},{"year":2011,"claim":"Extended EGR3's direct targets to innate immunity, showing ChIP-confirmed binding to the TREM-1 promoter in monocytes.","evidence":"In silico prediction and in vivo ChIP","pmids":["21421043"],"confidence":"Medium","gaps":["Single method for binding, no functional knockout","Downstream TREM-1 consequence not tested"]},{"year":2012,"claim":"Defined the molecular basis of EGR2/EGR3-dependent immune homeostasis, showing they directly induce SOCS1/SOCS3 to limit STAT1/STAT3 and antagonize Batf to permit AP-1 activation; their loss causes lethal autoimmunity.","evidence":"Conditional double KO, cytokine/STAT profiling, promoter analysis, ChIP","pmids":["23021953"],"confidence":"High","gaps":["Relative EGR2 vs EGR3 contribution to each target not fully separated"]},{"year":2013,"claim":"Established the upstream NRG1 signaling logic for Egr3 induction in muscle, mapping a composite SRF–CREB promoter element controlled by MRTF-A/B translocation and ERK-dependent CREB phosphorylation.","evidence":"Promoter mutagenesis, MRTF translocation, CREB phosphorylation, ERK inhibition in muscle cells and at spindles","pmids":["23318675","24272970"],"confidence":"High","gaps":["How this signaling couples to spindle-specific downstream targets unresolved"]},{"year":2013,"claim":"Proved a neuron-autonomous role for Egr3 in sympathetic axon/dendrite morphology and identified axonogenesis/guidance target genes via microarray.","evidence":"Neuron-specific Cre KO, primary culture with NGF, microarray, genetic labeling","pmids":["23467373"],"confidence":"High","gaps":["Direct vs indirect status of microarray targets not ChIP-validated"]},{"year":2014,"claim":"Reported an unexpected cytoplasmic localization of Egr3 at meiotic spindle/MTOCs in oocytes, while showing it does not directly bind microtubules, indicating an indirect MTOC association distinct from its nuclear role.","evidence":"Immunofluorescence, γ-tubulin co-localization, nocodazole, in vitro microtubule binding assay","pmids":["24722338"],"confidence":"Medium","gaps":["Functional significance of MTOC association unknown","Mediator of indirect association unidentified"]},{"year":2014,"claim":"Showed Egr3 gain-of-function biases thymocytes toward γδ T cell development and promotes Th17 differentiation, expanding its immune developmental role.","evidence":"Egr3 transgenic mice, flow cytometry, differentiation and co-culture assays, bleomycin model","pmids":["24475259"],"confidence":"Medium","gaps":["Loss-of-function requirement not tested","Direct targets in γδ lineage unknown"]},{"year":2015,"claim":"Definitively localized the spindle requirement to muscle by cell-specific ablation, showing Egr3 loss produces spindle remnants lacking GDNF and fusimotor innervation but retaining NT3 and Ia-afferent contact.","evidence":"Muscle-specific conditional KO, lineage tracing, MyHC/NT3/GDNF immunohistochemistry","pmids":["25855173"],"confidence":"High","gaps":["Whether GDNF is a direct EGR3 target not shown"]},{"year":2015,"claim":"Revealed cell-type-opposing functions in addiction, showing cocaine induces Egr3 in D1-MSNs and reduces it in D2-MSNs with opposite behavioral consequences, and altered Egr3 binding at numerous plasticity gene promoters.","evidence":"RiboTag transcriptomics, Cre-inducible AAV manipulation, D1/D2-Cre mice, ChIP","pmids":["25995477"],"confidence":"High","gaps":["Mechanism of opposite D1 vs D2 regulation unresolved"]},{"year":2015,"claim":"Identified Egr3 as required for sleep-deprivation-induced cortical Htr2a expression, linking it to serotonergic regulation.","evidence":"KO mice, sleep deprivation, Htr2a qPCR","pmids":["25857407"],"confidence":"Medium","gaps":["Direct promoter binding not shown in this study","Behavioral consequence not tested"]},{"year":2016,"claim":"Defined an Egr2/Egr3-Ltbp3-TGF-β3 axis in regulatory T cells preventing humoral autoimmunity, with double KO ablating TGF-β3 production.","evidence":"T cell-specific double KO, adoptive transfer, TGF-β3 vector rescue, Ltbp3 analysis","pmids":["27911796"],"confidence":"High","gaps":["Direct Ltbp3 promoter binding not detailed","EGR3-only contribution not isolated"]},{"year":2016,"claim":"Showed Egr3 promotes myoblast proliferation and survival via NF-κB activity and suppression of caspase-dependent apoptosis.","evidence":"shRNA in C2C12, NF-κB reporter, apoptosis assays, caspase-inhibitor rescue","pmids":["27576048"],"confidence":"Medium","gaps":["Direct EGR3 targets in NF-κB/apoptosis pathway not mapped","Single cell-line system"]},{"year":2017,"claim":"Established post-transcriptional control of EGR3, showing KSRP-driven miR-23a destabilizes EGR3 mRNA and that EGR3 promotes NSCLC migration and metastasis.","evidence":"KSRP manipulation, miRNA screening, 3'UTR reporter, in vivo metastasis","pmids":["28847731"],"confidence":"Medium","gaps":["EGR3 transcriptional targets driving metastasis here not identified","Single lab"]},{"year":2018,"claim":"Identified Bdnf as an Egr3-dependent activity-induced gene, showing seizure-induced Bdnf induction (exons IV/VI) is absent in Egr3-/- hippocampus.","evidence":"KO mice, ECS, microarray, qRT-PCR, in situ, promoter bioinformatics","pmids":["29867393"],"confidence":"Medium","gaps":["Promoter binding not confirmed by ChIP here","Direct vs indirect regulation unresolved"]},{"year":2018,"claim":"Defined a tissue-differentiation role outside neurons and immunity, showing EGR3 drives late epidermal differentiation enhancers and the epidermal differentiation complex, with loss in parakeratotic skin.","evidence":"Immunohistochemistry, RNA-seq, ChIP-seq, enhancer RNA, co-expression analysis","pmids":["30342896"],"confidence":"High","gaps":["Upstream signals inducing epidermal EGR3 not defined"]},{"year":2019,"claim":"Revealed sex-specific EGR3 regulation of cocaine relapse, with female-specific EGR3 reduction after abstinence and opposite behavioral effects of D2-MSN overexpression between sexes.","evidence":"Cocaine self-administration, EGR3 Western blot, A2A-Cre Egr3 overexpression, operant behavior","pmids":["31858986"],"confidence":"Medium","gaps":["Molecular basis of sex specificity unknown","Single lab"]},{"year":2020,"claim":"Defined a tumor-suppressive EGR3 program in prostate cancer, with direct activation of ZFP36, GADD45B, and SOCS3, suppression of EMT/invasion, and reduced bone metastasis.","evidence":"ChIP, luciferase, overexpression/knockdown, mouse bone metastasis model","pmids":["32796959"],"confidence":"High","gaps":["Context-dependent oncogenic vs suppressive roles across cancers not reconciled"]},{"year":2020,"claim":"Identified RELN as a direct EGR3 target mediating its inhibition of neurite outgrowth, providing an epistatic neuronal pathway.","evidence":"ChIP, reporter assay, overexpression/RELN knockdown rescue in SH-SY5Y, microarray/IPA","pmids":["33113163"],"confidence":"Medium","gaps":["In vivo relevance not tested","Single cell-line system"]},{"year":2020,"claim":"Linked EGR3 to cardiac fibrosis as a pro-fibrotic TGF-β-promoting factor repressed by miR-27a-5p.","evidence":"Luciferase 3'UTR validation, TAC model, miR-27a KO/inhibition, cardiac fibroblast culture","pmids":["33215816"],"confidence":"Medium","gaps":["Direct EGR3 transcriptional targets in fibrosis not mapped","Single lab"]},{"year":2021,"claim":"Established an NF-κB→EGR3→HDAC6→IL-27 axis driving mast cell-dependent allergic inflammation, with miR-182-5p as a negative regulator.","evidence":"RNA-seq, ChIP for p65/EGR3, luciferase for miR-182-5p, anaphylaxis models","pmids":["34234781"],"confidence":"High","gaps":["Generalizability of HDAC6 axis to other immune contexts unclear"]},{"year":2021,"claim":"Connected EGR3 to mitochondrial dynamics in addiction, showing cocaine enhances Egr3 binding at PGC1α/Drp1 promoters in D1-MSNs to remodel mitochondrial morphology.","evidence":"ChIP in NAc, D1-MSN Egr3 knockdown, mRNA quantification, EM morphology","pmids":["34187517"],"confidence":"Medium","gaps":["Direct vs indirect promoter regulation incompletely separated","Single lab"]},{"year":2022,"claim":"Confirmed Htr2a as a direct in vivo EGR3 target through ChIP and reporter site mutagenesis, mechanistically grounding the sleep-deprivation/serotonin link.","evidence":"KO mice, sleep deprivation, in vivo ChIP, reporter with binding-site mutations, qPCR/protein","pmids":["35001075"],"confidence":"High","gaps":["Behavioral/psychiatric consequence of the EGR3–5-HT2AR axis not fully defined"]},{"year":2022,"claim":"Broadened the activity-dependent EGR3 gene program to DNA-damage-response and AP-1 family genes (Gadd45b/g, Fos, Fosb, Mef2c, Calb2) after seizure.","evidence":"Hippocampal microarray of WT vs Egr3-/- after ECS, pathway analysis","pmids":["35941129"],"confidence":"Medium","gaps":["Direct binding to these promoters not validated","Functional consequences not tested"]},{"year":2023,"claim":"Identified an EGR3–MCL1 axis conferring tamoxifen resistance in ERα+ breast cancer by suppressing apoptosis, with estrone upregulating EGR3.","evidence":"ChIP, dual luciferase, overexpression/knockdown, apoptosis assays, Western blot","pmids":["37999751"],"confidence":"Medium","gaps":["Clinical relevance to patient resistance not established","Single lab"]},{"year":2024,"claim":"Defined EGR3 as a conserved mechanosensitive endothelial transcription factor essential for cardiac valve morphogenesis, acting cell-autonomously via Nr4a2b, validated across zebrafish, porcine, and human systems.","evidence":"egr3 null zebrafish, tissue-specific tools, live imaging, mechanostimulation of valvular endothelial cells","pmids":["38748804"],"confidence":"High","gaps":["Mechanotransduction pathway linking force to EGR3 induction not fully mapped"]},{"year":2024,"claim":"Established EGR3 as a cortisol-repressed negative regulator of adipogenesis acting via HDAC6.","evidence":"Overexpression/knockdown in hADSCs and 3T3-L1, cortisol treatment, ChIP/reporter of HDAC6","pmids":["38467615"],"confidence":"Medium","gaps":["In vivo metabolic phenotype of EGR3 manipulation not established","Single lab"]},{"year":null,"claim":"How EGR3 selects opposite activator vs repressor outcomes and cell-type-specific target sets across its diverse contexts (D1 vs D2 neurons, oncogenic vs tumor-suppressive cancer roles) remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying determinant of EGR3 activator/repressor switching identified","Cofactor-dependent target selection mechanism unknown","No structural model of EGR3-cofactor complexes"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,7,27,29,32,34,37]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,7,14,29,32,34]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,7,27,34]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[18]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,7,27,29,32]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,15,23,32]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,5,20,37]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[10,11,16]}],"complexes":[],"partners":["NAB2","RORC","CREB1","SRF"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q06889","full_name":"Early growth response protein 3","aliases":["Zinc finger protein pilot"],"length_aa":387,"mass_kda":42.6,"function":"Probable transcription factor involved in muscle spindle development","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q06889/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/EGR3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/EGR3","total_profiled":1310},"omim":[{"mim_id":"620799","title":"LONG INTERGENIC NONCODING RNA 941; LINC00941","url":"https://www.omim.org/entry/620799"},{"mim_id":"602419","title":"EARLY GROWTH RESPONSE 3; EGR3","url":"https://www.omim.org/entry/602419"},{"mim_id":"600800","title":"NGFIA-BINDING PROTEIN; NAB1","url":"https://www.omim.org/entry/600800"},{"mim_id":"137141","title":"GAMMA-AMINOBUTYRIC ACID RECEPTOR, ALPHA-4; GABRA4","url":"https://www.omim.org/entry/137141"},{"mim_id":"129010","title":"EARLY GROWTH RESPONSE 2; EGR2","url":"https://www.omim.org/entry/129010"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Nucleoplasm","reliability":"Uncertain"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skin 1","ntpm":41.7}],"url":"https://www.proteinatlas.org/search/EGR3"},"hgnc":{"alias_symbol":["PILOT"],"prev_symbol":[]},"alphafold":{"accession":"Q06889","domains":[{"cath_id":"3.30.160.60","chopping":"303-363","consensus_level":"medium","plddt":88.1913,"start":303,"end":363}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06889","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q06889-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q06889-F1-predicted_aligned_error_v6.png","plddt_mean":49.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EGR3","jax_strain_url":"https://www.jax.org/strain/search?query=EGR3"},"sequence":{"accession":"Q06889","fasta_url":"https://rest.uniprot.org/uniprotkb/Q06889.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q06889/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06889"}},"corpus_meta":[{"pmid":"15834410","id":"PMC_15834410","title":"Egr-2 and Egr-3 are negative regulators of T 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EGR3 is induced as an immediate-early gene by mitogenic stimulation.\",\n      \"method\": \"CAT reporter assay, low-stringency hybridization cloning, Northern blot\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro transcriptional activation assay with defined cis-element, single lab but multiple orthogonal methods (reporter assay, sequence analysis, expression profiling)\",\n      \"pmids\": [\"1906159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Egr3/Pilot is rapidly and transiently induced in hippocampal and cortical neurons by electroconvulsive seizure, NMDA receptor activation, and dopamine-altering drugs; it binds the same consensus DNA sequence as Egr1/zif268 and the two proteins are co-expressed in the same neurons, suggesting competitive or cooperative transcriptional regulation at shared target sites.\",\n      \"method\": \"Differential cDNA cloning, Northern blot, gel shift (EMSA) for DNA binding, in situ hybridization, pharmacological manipulations\",\n      \"journal\": \"Learning & Memory\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA demonstrated sequence-specific DNA binding; multiple orthogonal methods (cloning, expression, DNA binding); single lab\",\n      \"pmids\": [\"10467592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Egr3 is essential for muscle spindle morphogenesis: Egr3-deficient mice lack muscle spindles entirely. Egr3 is expressed specifically in developing intrafusal myotubes (not in Ia afferent neurons) after innervation by sensory afferents, indicating that Egr3-mediated transcription in myotubes is required for spindle induction.\",\n      \"method\": \"Gene targeting (knockout mice), histology, in situ hybridization, nerve transection experiments\",\n      \"journal\": \"Nature Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean germline KO with specific developmental phenotype (absence of spindles), expression localization, replicated by subsequent studies\",\n      \"pmids\": [\"9731539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"EGR3 expression in T cells (but not fibroblasts) is driven by a 27-bp promoter element that binds NF-ATp and NF-ATc, making it sensitive to cyclosporin A (CsA) inhibition of calcineurin/NF-AT signaling. In fibroblasts, different CsA-insensitive promoter regions drive EGR3 expression, and insufficient NF-ATp levels explain the lack of this element's activity there.\",\n      \"method\": \"Promoter deletion analysis, EMSA, transient transfection reporter assays, NF-ATp overexpression in fibroblasts\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — detailed promoter dissection with mutagenesis, EMSA, and gain-of-function rescue in a single rigorous study\",\n      \"pmids\": [\"9819402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Following electroconvulsive stimulation in hippocampal granule cells, Egr1 protein peaks at 0.5–1 h and decays by 4 h, whereas Egr3 protein peaks at 4 h; their DNA-binding activities follow the same sequential pattern, indicating they mediate early and late phases, respectively, of transcriptional responses at their shared consensus element.\",\n      \"method\": \"Western blot, gel shift assay (EMSA), electroconvulsive stimulation in vivo\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and protein-level time courses in vivo; single lab, two orthogonal methods\",\n      \"pmids\": [\"9489747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Egr3 is required for intrafusal fiber differentiation and spindle maintenance after birth: in Egr3-deficient mice, myotubes are initially innervated by Ia afferents and begin spindle assembly, but fail to express slow-developmental myosin heavy chain, form thin capsules, and after birth the sensory and motor innervation withdraws and spindles disassemble. Egr3 expression in myotubes is controlled by innervation (lost after nerve transection).\",\n      \"method\": \"Egr3 KO analysis, immunohistochemistry, in situ hybridization, nerve transection\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — detailed spatiotemporal KO phenotype analysis with multiple markers, replicated findings from the 1998 paper in a follow-up study\",\n      \"pmids\": [\"11401400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"EGR3 is a direct transcriptional target of estrogen receptor alpha (ERα) in breast cancer MCF-7 cells; EGR3 in turn transcriptionally induces NAB2 and FasL. Cycloheximide and ICI 182,780 (ERα antagonist) block EGR3 induction, confirming it is a primary ERα target.\",\n      \"method\": \"Northern blot, cycloheximide/ICI 182,780 treatment, stable transfection with inducible EGR3, microarray, reporter assay\",\n      \"journal\": \"Journal of Molecular Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition of ER plus functional downstream target identification; single lab, multiple methods\",\n      \"pmids\": [\"15171706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Egr3 directly up-regulates GABRA4 promoter activity in hippocampal neurons, and Egr3 knockout mice have ~50% less GABRA4 mRNA in hippocampus. After pilocarpine-induced status epilepticus, Egr3 binds to the GABRA4 promoter (shown by ChIP) and both GABRA4 and alpha4 subunit protein are increased, establishing Egr3 as a transcriptional regulator of GABRA4 in epilepsy.\",\n      \"method\": \"Reporter gene transfection in primary hippocampal neurons, Egr3 KO mice, ChIP, in vivo seizure model\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP confirmed in vivo binding; reporter assays; KO validation; multiple orthogonal methods in one study\",\n      \"pmids\": [\"16091474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Egr2 and Egr3 function as negative regulators of T cell activation and promote anergy by inducing expression of the E3 ubiquitin ligase Cbl-b. Egr3-deficient T cells have reduced Cbl-b expression and are resistant to peptide-induced tolerance in vivo.\",\n      \"method\": \"Microarray, overexpression in T cells, Egr3 KO mice, in vivo tolerance assay\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO phenotype plus gain-of-function plus target gene validation; replicated in subsequent studies\",\n      \"pmids\": [\"15834410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Egr3 is transiently induced by pre-TCR signaling in thymocytes and promotes a distinct proliferative phase by reducing E protein-dependent RORγt expression and physically interacting with RORγt to prevent induction of RORγt target genes. After Egr3 levels subside, RORγt activity increases to promote gene rearrangement.\",\n      \"method\": \"Genetic epistasis (RORγt, Egr3, E protein manipulation), thymocyte proliferation assays, protein interaction studies\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional epistasis and protein interaction demonstrated; single lab\",\n      \"pmids\": [\"16782036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Egr3 is required for normal hippocampal long-term potentiation (LTP) — both early and late phase — and for hippocampal and amygdala-dependent short-term and long-term learning and memory, independently of Egr1 (Egr1 protein levels are unchanged in Egr3 KO brain).\",\n      \"method\": \"Egr3 KO mice, electrophysiological LTP recordings, behavioral memory tests (fear conditioning, etc.), Western blot for Egr1\",\n      \"journal\": \"Molecular and Cellular Neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with specific electrophysiological and behavioral phenotypes, distinguishing Egr3 from Egr1 function\",\n      \"pmids\": [\"17350282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Egr3 is induced by NGF signaling in sympathetic neurons and is required for their normal terminal axon extension and branching in target tissues, but not for neuron survival. Egr3-deficient mice have severe sympathetic target tissue innervation abnormalities and physiological dysautonomia.\",\n      \"method\": \"Egr3 KO mice, immunohistochemistry, physiological autonomic function assays, NGF treatment\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with specific innervation and physiological phenotypes; downstream pathway (NGF→Egr3) established; replicated by subsequent neuron-specific ablation study\",\n      \"pmids\": [\"18653557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"EGR1, EGR2, and EGR3 all activate NAB2 transcription through similar cis-regulatory elements in melanoma and carcinoma cells, establishing a negative feedback loop (NAB2 represses EGR-induced transcription). EGR3 depletion by siRNA reduces endogenous NAB2 levels; EGR3 also regulates EGR2 expression.\",\n      \"method\": \"siRNA knockdown, reporter assays, kinetic expression studies\",\n      \"journal\": \"Journal of Cellular Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assays and siRNA knockdown; single lab, multiple methods\",\n      \"pmids\": [\"20506119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BDNF increases NMDA receptor NR1 subunit levels in cortical neurons via MAPK pathway activation of TrkB, and this NR1 transcription is controlled by binding of both CREB and Egr3 to the core NR1 promoter region.\",\n      \"method\": \"BDNF treatment of rat cortical neurons, reporter assays, MAPK pathway inhibition, protein expression analysis\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter binding and pathway inhibition experiments; single lab\",\n      \"pmids\": [\"22035109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EGR3 binds to the promoter of TREM-1 in monocytes as demonstrated by ChIP, indicating that EGR3 directly regulates TREM-1 gene expression.\",\n      \"method\": \"In silico binding site prediction and in vivo ChIP assay\",\n      \"journal\": \"Brain, Behavior, and Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP confirmed in vivo promoter binding; single lab, single method for binding\",\n      \"pmids\": [\"21421043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Deletion of both Egr2 and Egr3 in lymphocytes causes lethal autoimmunity with hyperactive STAT1/STAT3 and impaired antigen receptor-induced AP-1 activation. Egr2 and/or Egr3 directly induce expression of SOCS1 and SOCS3 (inhibitors of STAT1/STAT3), and block function of Batf (an AP-1 inhibitor).\",\n      \"method\": \"Conditional double KO mice, cytokine profiling, STAT phosphorylation assays, promoter analysis, ChIP\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double KO with specific molecular mechanism (SOCS1/SOCS3 direct targets) confirmed by ChIP; multiple orthogonal methods\",\n      \"pmids\": [\"23021953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Egr3 has a sympathetic neuron-autonomous role: isolated Egr3-deficient sympathetic neurons have neurite outgrowth defects in response to NGF, and neuron-specific Egr3 ablation recapitulates the target tissue innervation abnormalities of germline KO. Microarray identified target genes involved in axonogenesis, dendritogenesis, and axon guidance; Egr3 specifically regulates dendrite morphology and terminal axon branching.\",\n      \"method\": \"Cre-mediated sympathetic neuron-specific KO, primary neuron culture with NGF, microarray, genetic neuronal labeling\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific KO with primary culture phenotype and microarray target identification; multiple orthogonal methods\",\n      \"pmids\": [\"23467373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NRG1 signaling induces Egr3 transcription in muscle cells through a composite SRF-CREB regulatory element in the Egr3 promoter. NRG1 targets SRF by stimulating nuclear translocation of MRTF-A and MRTF-B coactivators, and phosphorylates CREB. The Erk1/2 MAP kinase is required upstream of CREB phosphorylation for NRG1-induced Egr3 transcription.\",\n      \"method\": \"Reporter assays with promoter deletions/mutations, MRTF nuclear translocation assays, CREB phosphorylation assays, ERK inhibition in cultured muscle cells and in vivo immunostaining at spindles\",\n      \"journal\": \"Experimental Cell Research / Journal of Neuroscience Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — detailed promoter mutagenesis, coactivator translocation, kinase inhibition; two papers from same lab with converging mechanistic results\",\n      \"pmids\": [\"23318675\", \"24272970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Egr3 protein co-localizes with the meiotic spindle and cytosolic microtubule organizing centers (MTOCs) in mouse oocytes, accumulating around γ-tubulin. Nocodazole-induced microtubule depolymerization disrupts Egr3 localization. However, in vitro microtubule interaction assay showed Egr3 does NOT directly bind polymerized microtubules, suggesting an indirect association with MTOCs.\",\n      \"method\": \"Immunofluorescence with Egr3-specific antibodies, co-localization with γ-tubulin, nocodazole treatment, in vitro microtubule binding assay\",\n      \"journal\": \"PloS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct localization with functional perturbation (nocodazole) and negative in vitro binding result; single lab\",\n      \"pmids\": [\"24722338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Egr3 promotes γδ T cell development in the thymus: Egr3 transgenic (overexpressing) mice show a marked increase in peripheral γδ T cells, and thymocytes from these mice are biased toward γδ T cell development. Egr3-induced γδ T cells promote Th17 differentiation when co-cultured with wildtype CD4+ T cells.\",\n      \"method\": \"Egr3 transgenic mice, flow cytometry, thymocyte differentiation assays, co-culture experiments, bleomycin lung inflammation model\",\n      \"journal\": \"PloS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function transgenic with specific cellular phenotype and functional co-culture validation; single lab\",\n      \"pmids\": [\"24475259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Egr3 has a skeletal muscle cell-autonomous role in intrafusal fiber differentiation: cell-specific Egr3 ablation in muscle blocks myotube development after Ia-afferent contact, producing shortened 'spindle remnants' that lack fusimotor innervation and fail to express GDNF (required for fusimotor neuron survival), but retain NT3 expression and Ia-afferent innervation.\",\n      \"method\": \"Conditional (muscle-specific) Egr3 KO, genetic lineage tracing, immunohistochemistry for MyHC, NT3, GDNF\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO definitively placing Egr3 in muscle (not sensory neurons or Schwann cells); multiple molecular markers\",\n      \"pmids\": [\"25855173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Egr3 has opposing roles in nucleus accumbens MSN subtypes in cocaine action: repeated cocaine induces Egr3 in D1-MSNs and reduces it in D2-MSNs. Overexpression of Egr3 in D1-MSNs enhances cocaine reward and locomotion, while overexpression in D2-MSNs blunts these behaviors. Cocaine alters Egr3 binding to promoters of downstream genes including Camk2α, CREB, FosB, Nr4a2, Sirt1 (increased binding in D1-MSNs) and G9a, Dnmt3a (decreased binding).\",\n      \"method\": \"RiboTag cell-type-specific transcriptomics, Cre-inducible AAV overexpression/knockdown, D1-Cre and D2-Cre mice, ChIP\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific gain- and loss-of-function with behavioral readouts plus ChIP for downstream targets; multiple orthogonal approaches\",\n      \"pmids\": [\"25995477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Egr3 is required for sleep-deprivation-induced expression of Htr2a (serotonin 2A receptor) in mouse cortex: sleep deprivation induces a 2-fold increase in Htr2a mRNA in wildtype but not Egr3-/- mice.\",\n      \"method\": \"Egr3 KO mice, sleep deprivation, qPCR for Htr2a mRNA\",\n      \"journal\": \"ACS Chemical Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean KO with specific gene expression phenotype; single lab, limited mechanistic follow-up in this paper\",\n      \"pmids\": [\"25857407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Egr2 and Egr3 in T cells cooperatively prevent humoral autoimmunity by supporting TGF-β3 secretion from CD4+CD25-LAG3+ regulatory T cells. Egr2 and Egr3 maintain expression of Ltbp3 (latent TGF-β binding protein 3), which is required for TGF-β3 production; Egr2/3 double KO completely ablates TGF-β3 production from these cells.\",\n      \"method\": \"T cell-specific Egr2/Egr3 double KO mice, adoptive transfer, TGF-β3-expressing vector treatment, Ltbp3 expression analysis\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — double conditional KO with specific mechanistic pathway (Ltbp3→TGF-β3) and rescue experiments; single lab but multiple methods\",\n      \"pmids\": [\"27911796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Egr3 promotes myoblast proliferation and survival: shRNA inhibition of Egr3 in C2C12 cells impairs proliferation rate, reduces NF-κB transcriptional activity, increases apoptotic markers (annexin V+, caspase-3/7, PARP), and the proliferation deficit is partially rescued by pan-caspase inhibitor Z-VAD-FMK.\",\n      \"method\": \"shRNA knockdown in C2C12 cells, NF-κB reporter assay, apoptosis assays (annexin V, caspase activity), caspase inhibitor rescue\",\n      \"journal\": \"Journal of Cellular Physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular phenotype and pathway (NF-κB/caspase) and pharmacological rescue; single lab\",\n      \"pmids\": [\"27576048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KSRP decreases EGR3 mRNA stability in an ARE-independent manner via miR-23a: KSRP facilitates miR-23a biogenesis, miR-23a directly binds EGR3 3'UTR reducing EGR3 expression, and EGR3 acts downstream of KSRP to promote NSCLC cell mobility and metastasis.\",\n      \"method\": \"KSRP overexpression/knockdown in NSCLC cells, microarray, miRNA screening, 3'UTR reporter assay, in vivo metastasis model\",\n      \"journal\": \"Biochimica et Biophysica Acta - Gene Regulatory Mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3'UTR luciferase validation plus in vivo metastasis model; single lab\",\n      \"pmids\": [\"28847731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Egr3 is required for ECS-induced hippocampal expression of Bdnf: ECS induces high-level Bdnf expression in WT hippocampus (including exons IV and VI), but this induction is absent in Egr3-/- mice. The Bdnf promoter contains eight putative EGR3 binding sites, suggesting direct regulation.\",\n      \"method\": \"Egr3 KO mice, ECS, expression microarray, qRT-PCR, in situ hybridization, Bdnf promoter bioinformatics\",\n      \"journal\": \"Frontiers in Behavioral Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with specific downstream gene (Bdnf) phenotype replicated across cohorts; promoter binding not confirmed by ChIP in this paper\",\n      \"pmids\": [\"29867393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"EGR3 is a transcriptional regulator of late epidermal differentiation: EGR3 is highly expressed in the stratum granulosum, activates enhancers and drives expression of genes in the epidermal differentiation complex (including filaggrin, loricrin, involucrin targets), and 20 EGR3-specific late differentiation targets were identified. EGR3 expression is lost in parakeratotic lesional skin.\",\n      \"method\": \"Immunohistochemistry, RNA-seq, ChIP-seq for enhancer analysis, enhancer RNA detection, weighted gene co-expression network analysis\",\n      \"journal\": \"Journal of Investigative Dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP-seq for enhancer binding combined with transcriptomic target identification; single lab but multiple orthogonal genomic methods\",\n      \"pmids\": [\"30342896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EGR3 sex-specifically regulates cocaine relapse: EGR3 protein is reduced only in female rodents after 20 days of forced abstinence from cocaine self-administration. Egr3 overexpression in NAc D2-MSNs during forced abstinence facilitates extinction and blunts drug-induced reinstatement in female mice but has the opposite effect in male mice.\",\n      \"method\": \"Intravenous cocaine self-administration, Western blot for EGR3 protein, virally mediated Egr3 overexpression via A2A-Cre, operant behavioral testing\",\n      \"journal\": \"Biological Psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific gain-of-function with behavioral outcomes in both sexes; single lab\",\n      \"pmids\": [\"31858986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EGR3 transcriptionally activates ZFP36, GADD45B, and SOCS3 by directly binding to their promoter regions, and suppresses EMT and cell migration/invasion in prostate cancer cells; EGR3 overexpression suppresses bone metastasis in mouse models.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, EGR3 overexpression/knockdown in prostate cancer cells, mouse bone metastasis model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP confirmed direct promoter binding of multiple targets; in vivo metastasis model; single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"32796959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EGR3 directly binds the RELN (Reelin) promoter and activates RELN expression; EGR3 overexpression reduces neurite outgrowth in SH-SY5Y cells, an effect partially reversed by RELN knockdown, placing RELN downstream of EGR3 in neurite outgrowth regulation.\",\n      \"method\": \"ChIP, luciferase reporter assay, EGR3 overexpression/RELN knockdown in SH-SY5Y cells, neurite outgrowth quantification, microarray + IPA\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP and reporter assay confirmed direct transcriptional regulation; epistasis by RELN knockdown rescue; single lab\",\n      \"pmids\": [\"33113163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-27a-5p inhibits cardiac fibrosis by suppressing EGR3 expression: miR-27a-5p targets EGR3 3'UTR (validated by reporter assay), and EGR3 suppression reduces TGF-β signaling and pro-fibrotic protein secretion in cardiac fibroblasts. In vivo, miR-27a-5p attenuates TAC-induced cardiac fibrosis.\",\n      \"method\": \"In silico Venn analysis, luciferase reporter assay, TAC mouse model, miR-27a KO and antisense inhibition, cardiac fibroblast culture\",\n      \"journal\": \"Journal of Cellular and Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay validation plus in vivo TAC model; single lab\",\n      \"pmids\": [\"33215816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"EGR3 is necessary for allergic inflammation: NF-κB p65 directly regulates EGR3 expression (binding to EGR3 promoter), and EGR3 in turn directly binds the HDAC6 promoter to increase HDAC6 expression, forming an EGR3-HDAC6-IL-27 signaling axis that mediates mast cell-dependent allergic responses and passive anaphylaxis. miR-182-5p is a direct negative regulator of EGR3 (validated by luciferase assay).\",\n      \"method\": \"RNA-seq, ChIP for NF-κB p65 on EGR3 promoter, ChIP for EGR3 on HDAC6 promoter, luciferase assay for miR-182-5p/EGR3 interaction, passive cutaneous and systemic anaphylaxis models\",\n      \"journal\": \"Frontiers in Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple ChIP experiments confirming direct transcriptional regulation at two levels; luciferase validation; in vivo anaphylaxis models; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"34234781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cocaine exposure enhances Egr3 binding to promoters of nuclear genes involved in mitochondrial dynamics (PGC1α, Drp1) in D1-MSNs; blunting Egr3 in D1-MSNs blocks cocaine-mediated enhancement of PGC1α and Drp1 expression and attenuates cocaine-induced enhancement of small-sized mitochondria.\",\n      \"method\": \"ChIP in NAc tissue, virally mediated Egr3 knockdown in D1-MSNs, mRNA quantification, mitochondrial morphology analysis (electron microscopy)\",\n      \"journal\": \"Molecular Brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for Egr3 binding at target promoters combined with cell-type-specific loss-of-function and morphological readout; single lab\",\n      \"pmids\": [\"34187517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"EGR3 directly regulates Htr2a (5-HT2AR) expression: ChIP in mouse frontal cortex demonstrated EGR3 protein binding to the Htr2a promoter in vivo, and EGR3 drives Htr2a reporter expression via two EGR3 binding sites. Sleep deprivation-induced upregulation of 5-HT2AR requires Egr3, as it does not occur in Egr3-/- mice.\",\n      \"method\": \"Egr3 KO mice, sleep deprivation, ChIP in vivo, luciferase reporter assay with EGR3 binding site mutations, qPCR and protein quantification\",\n      \"journal\": \"Molecular Psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vivo ChIP confirmed promoter binding, reporter assay with site mutagenesis confirmed functional sites, KO phenotype confirmed requirement; multiple orthogonal methods\",\n      \"pmids\": [\"35001075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Egr3 is required for activity-dependent expression of DNA damage response genes (Gadd45b, Gadd45g) and AP-1 family genes (Fos, Fosb), as well as Mef2c and Calb2, in the hippocampus following ECS. These genes are differentially expressed between WT and Egr3-/- mice after seizure.\",\n      \"method\": \"Expression microarray on hippocampi of WT vs Egr3-/- mice after ECS, bioinformatics/Enrichr pathway analysis\",\n      \"journal\": \"Translational Psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — KO transcriptomics identified downstream targets; single lab but replicated core Egr3-dependent gene finding (Bdnf) and extended to new targets\",\n      \"pmids\": [\"35941129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"EGR3 directly binds to the MCL1 promoter to activate its transcription, and this EGR3-MCL1 axis confers tamoxifen resistance in ERα-positive breast cancer cells by suppressing apoptosis. Estrone upregulates EGR3 expression in tamoxifen-resistant cells.\",\n      \"method\": \"ChIP, dual luciferase assay, EGR3 overexpression/knockdown, apoptosis assays (CCK8, colony formation, flow cytometry), Western blot\",\n      \"journal\": \"Journal of Cancer Research and Clinical Oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP and luciferase assay confirmed direct promoter binding; functional rescue with apoptosis assays; single lab\",\n      \"pmids\": [\"37999751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"EGR3 functions as a conserved mechanosensitive transcription factor required for cardiac valve morphogenesis: egr3 null zebrafish completely lack valve leaflets, leading to blood regurgitation. EGR3 acts cell-autonomously in endothelial cells, and one downstream effector is the nuclear receptor Nr4a2b. Mechanical forces upregulate egr3/EGR3 expression in zebrafish heart, porcine valvular endothelial cells, and during human aortic valve remodeling.\",\n      \"method\": \"egr3 null zebrafish (CRISPR), tissue-specific loss- and gain-of-function tools, live imaging of valve morphogenesis, in vitro mechanostimulation of porcine valvular endothelial cells\",\n      \"journal\": \"Science Advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — complete null phenotype, cell-autonomous function established by tissue-specific tools, effector identified, mechanosensitivity validated across three systems; single lab but multiple model systems\",\n      \"pmids\": [\"38748804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"EGR3 negatively regulates adipogenesis: EGR3 is downregulated by cortisol in adipose tissue of obese subjects and high-fat-diet mice. EGR3 suppresses adipogenesis and lipogenesis in hADSCs and 3T3-L1 cells via transcriptional regulation of HDAC6 (a downstream target gene and negative regulator of adipogenesis).\",\n      \"method\": \"EGR3 overexpression/knockdown in hADSCs and 3T3-L1 cells, cortisol treatment, ChIP/reporter analysis of HDAC6 as EGR3 target\",\n      \"journal\": \"Cell Death Discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with cellular phenotype and downstream target identification; single lab\",\n      \"pmids\": [\"38467615\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EGR3 is a zinc-finger transcription factor that binds the consensus GC-rich element CGCCCCCGC to activate or repress target gene transcription in response to diverse signals including NGF, NRG1 (via ErbB/ERK/CREB/SRF), BDNF, estrogen, mechanical forces, and synaptic/neuronal activity; it functions as an immediate-early gene regulator of muscle spindle morphogenesis (in intrafusal myotubes downstream of NRG1-ErbB signaling), sympathetic neuron axon branching (downstream of NGF), T cell anergy and autoimmunity (via induction of Cbl-b, SOCS1/3, Ltbp3/TGF-β3, and suppression of Batf), hippocampal LTP and memory, cardiac valve morphogenesis (as a mechanosensitive endothelial transcription factor driving Nr4a2b), late epidermal differentiation, and cocaine-mediated neuroplasticity in NAc MSN subtypes, with its activity modulated by negative feedback through NAB2 and by upstream miRNAs (miR-23a, miR-27a, miR-182-5p, miR-200c-3p) that target its mRNA.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"EGR3 is a Cys2-His2 zinc-finger immediate-early transcription factor that binds the GC-rich consensus element CGCCCCCGC—shared with EGR1/EGR2—to activate or repress target genes in response to mitogenic, neuronal-activity, and hormonal signals [#0, #1]. Its transcription is itself driven by signal-specific promoter inputs: an NF-AT-dependent 27-bp element confers calcineurin-sensitive induction in T cells [#3], while NRG1 induces Egr3 in muscle through a composite SRF–CREB element via MRTF-A/B nuclear translocation and ERK1/2-dependent CREB phosphorylation [#17]. In the nervous system EGR3 is a transient activity-induced regulator that, acting sequentially with EGR1, controls late-phase transcriptional responses and is required for hippocampal LTP and learning, for activity-dependent induction of Bdnf, GABRA4, and Htr2a, and—downstream of NGF—for sympathetic neuron terminal axon and dendrite branching [#4, #7, #10, #16, #26, #34]. In muscle EGR3 acts cell-autonomously within intrafusal myotubes as the essential transcriptional driver of muscle spindle morphogenesis and maintenance [#2, #5, #20]. In the immune system EGR3 (with EGR2) restrains T cell activation and autoimmunity by inducing Cbl-b, SOCS1/SOCS3, and Ltbp3/TGF-β3 while blocking Batf [#8, #15, #23]. EGR3 establishes a NAB2 negative-feedback loop and operates as a context-dependent activator or repressor across epidermal differentiation, cancer cell migration/metastasis, cocaine neuroplasticity in nucleus accumbens MSN subtypes, and mechanosensitive cardiac valve morphogenesis via Nr4a2b [#12, #21, #27, #29, #37].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established EGR3's molecular identity by showing it is a zinc-finger immediate-early gene that binds the same GC-rich cis element as EGR1/EGR2 and activates transcription, defining it as a sequence-specific transcriptional activator.\",\n      \"evidence\": \"CAT reporter assay, cloning, and Northern blot defining the CGCCCCCGC target element\",\n      \"pmids\": [\"1906159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No endogenous target genes identified at this stage\", \"No tissue-specific function established\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Placed EGR3 in neuronal activity-dependent transcription by showing rapid induction by seizure and NMDA signaling and co-expression with Egr1 at shared binding sites, raising the question of how the two EGR proteins divide labor.\",\n      \"evidence\": \"Differential cloning, EMSA DNA binding, in situ hybridization, and pharmacology in hippocampal/cortical neurons\",\n      \"pmids\": [\"10467592\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Egr1 and Egr3 compete or cooperate at targets unresolved\", \"No direct downstream neuronal target identified\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated a non-redundant developmental role: Egr3 is essential and cell-autonomous in intrafusal myotubes for muscle spindle morphogenesis, establishing EGR3 as a developmental master regulator downstream of innervation.\",\n      \"evidence\": \"Germline knockout mice, histology, in situ hybridization, and nerve transection\",\n      \"pmids\": [\"9731539\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream transcriptional targets in myotubes not identified\", \"Upstream innervation-derived signal unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Dissected signal-specific EGR3 promoter logic, showing T cell EGR3 induction depends on NF-ATp/NF-ATc binding a 27-bp element and is calcineurin/CsA-sensitive, while fibroblasts use distinct promoter inputs.\",\n      \"evidence\": \"Promoter deletion, EMSA, reporter assays, and NF-ATp overexpression rescue\",\n      \"pmids\": [\"9819402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of NF-AT-driven EGR3 in T cells not yet defined\", \"Cell-type specificity mechanism only partially resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Resolved the EGR1/EGR3 division of labor temporally by showing Egr1 mediates the early and Egr3 the late phase of seizure-induced transcription at the shared element.\",\n      \"evidence\": \"Western blot and EMSA time courses after electroconvulsive stimulation in vivo\",\n      \"pmids\": [\"9489747\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, in vivo only\", \"Distinct late-phase target genes not yet identified\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Refined the spindle phenotype to a postnatal differentiation/maintenance requirement, showing innervated myotubes initiate but fail to complete spindle assembly without Egr3.\",\n      \"evidence\": \"Spatiotemporal KO marker analysis, immunohistochemistry, nerve transection\",\n      \"pmids\": [\"11401400\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct EGR3 target genes governing myosin/capsule formation unknown\"]\n    },\n    {\n      \"year\": \"2004\",\n      \"claim\": \"Connected EGR3 to hormone signaling, identifying it as a primary ERα target that in turn induces NAB2 and FasL in breast cancer cells.\",\n      \"evidence\": \"Northern blot, cycloheximide/ICI 182,780, inducible EGR3, microarray, reporter assay in MCF-7\",\n      \"pmids\": [\"15171706\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter binding to NAB2/FasL not shown by ChIP here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Provided first in vivo ChIP evidence of direct EGR3 target regulation, showing Egr3 binds and activates the GABRA4 promoter in hippocampus, linking EGR3 to neuronal GABA receptor expression in epilepsy.\",\n      \"evidence\": \"Reporter transfection, KO mice, ChIP, and pilocarpine seizure model\",\n      \"pmids\": [\"16091474\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional impact of altered GABRA4 on seizure behavior not fully resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined EGR3's immune function: with EGR2 it negatively regulates T cell activation and induces anergy via the E3 ligase Cbl-b, establishing EGR3 as a tolerance-promoting factor.\",\n      \"evidence\": \"Microarray, T cell overexpression, KO mice, and in vivo tolerance assay\",\n      \"pmids\": [\"15834410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Cbl-b promoter binding not definitively shown\", \"Redundancy with Egr2 not separated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed a non-transcriptional regulatory mode in thymocytes: Egr3 physically interacts with RORγt and reduces its activity to drive a proliferative phase of pre-TCR signaling.\",\n      \"evidence\": \"Genetic epistasis, proliferation assays, and protein interaction studies\",\n      \"pmids\": [\"16782036\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of EGR3–RORγt interaction undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Separated EGR3 from EGR1 functionally in cognition, showing Egr3 is required for hippocampal LTP and memory independently of unchanged Egr1 levels.\",\n      \"evidence\": \"KO mice, LTP electrophysiology, behavioral memory tests, Egr1 Western blot\",\n      \"pmids\": [\"17350282\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Synaptic target genes mediating the LTP defect not identified here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established the NGF→Egr3 axis in sympathetic neurons required for terminal axon branching and autonomic function but not survival.\",\n      \"evidence\": \"KO mice, immunohistochemistry, autonomic physiology, NGF treatment\",\n      \"pmids\": [\"18653557\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neuron-autonomous vs target-tissue contribution not yet separated\", \"Direct axon-guidance targets unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Formalized the EGR–NAB2 negative-feedback loop, showing EGR3 (like EGR1/2) activates NAB2, which represses EGR-induced transcription, and that EGR3 also regulates EGR2.\",\n      \"evidence\": \"siRNA knockdown, reporter assays, kinetic expression in melanoma/carcinoma cells\",\n      \"pmids\": [\"20506119\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative dynamics of feedback in vivo unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked EGR3 to BDNF-driven synaptic plasticity, showing Egr3 and CREB co-regulate the NMDA NR1 subunit promoter downstream of TrkB/MAPK.\",\n      \"evidence\": \"BDNF treatment of cortical neurons, reporter assays, MAPK inhibition\",\n      \"pmids\": [\"22035109\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct EGR3 binding to NR1 promoter not confirmed by ChIP\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended EGR3's direct targets to innate immunity, showing ChIP-confirmed binding to the TREM-1 promoter in monocytes.\",\n      \"evidence\": \"In silico prediction and in vivo ChIP\",\n      \"pmids\": [\"21421043\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method for binding, no functional knockout\", \"Downstream TREM-1 consequence not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the molecular basis of EGR2/EGR3-dependent immune homeostasis, showing they directly induce SOCS1/SOCS3 to limit STAT1/STAT3 and antagonize Batf to permit AP-1 activation; their loss causes lethal autoimmunity.\",\n      \"evidence\": \"Conditional double KO, cytokine/STAT profiling, promoter analysis, ChIP\",\n      \"pmids\": [\"23021953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative EGR2 vs EGR3 contribution to each target not fully separated\"]\n    },\n    {\n      \"year\": \"2013\",\n      \"claim\": \"Established the upstream NRG1 signaling logic for Egr3 induction in muscle, mapping a composite SRF–CREB promoter element controlled by MRTF-A/B translocation and ERK-dependent CREB phosphorylation.\",\n      \"evidence\": \"Promoter mutagenesis, MRTF translocation, CREB phosphorylation, ERK inhibition in muscle cells and at spindles\",\n      \"pmids\": [\"23318675\", \"24272970\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How this signaling couples to spindle-specific downstream targets unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Proved a neuron-autonomous role for Egr3 in sympathetic axon/dendrite morphology and identified axonogenesis/guidance target genes via microarray.\",\n      \"evidence\": \"Neuron-specific Cre KO, primary culture with NGF, microarray, genetic labeling\",\n      \"pmids\": [\"23467373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect status of microarray targets not ChIP-validated\"]\n    },\n    {\n      \"year\": \"2014\",\n      \"claim\": \"Reported an unexpected cytoplasmic localization of Egr3 at meiotic spindle/MTOCs in oocytes, while showing it does not directly bind microtubules, indicating an indirect MTOC association distinct from its nuclear role.\",\n      \"evidence\": \"Immunofluorescence, γ-tubulin co-localization, nocodazole, in vitro microtubule binding assay\",\n      \"pmids\": [\"24722338\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional significance of MTOC association unknown\", \"Mediator of indirect association unidentified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed Egr3 gain-of-function biases thymocytes toward γδ T cell development and promotes Th17 differentiation, expanding its immune developmental role.\",\n      \"evidence\": \"Egr3 transgenic mice, flow cytometry, differentiation and co-culture assays, bleomycin model\",\n      \"pmids\": [\"24475259\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Loss-of-function requirement not tested\", \"Direct targets in γδ lineage unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Definitively localized the spindle requirement to muscle by cell-specific ablation, showing Egr3 loss produces spindle remnants lacking GDNF and fusimotor innervation but retaining NT3 and Ia-afferent contact.\",\n      \"evidence\": \"Muscle-specific conditional KO, lineage tracing, MyHC/NT3/GDNF immunohistochemistry\",\n      \"pmids\": [\"25855173\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GDNF is a direct EGR3 target not shown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed cell-type-opposing functions in addiction, showing cocaine induces Egr3 in D1-MSNs and reduces it in D2-MSNs with opposite behavioral consequences, and altered Egr3 binding at numerous plasticity gene promoters.\",\n      \"evidence\": \"RiboTag transcriptomics, Cre-inducible AAV manipulation, D1/D2-Cre mice, ChIP\",\n      \"pmids\": [\"25995477\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of opposite D1 vs D2 regulation unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified Egr3 as required for sleep-deprivation-induced cortical Htr2a expression, linking it to serotonergic regulation.\",\n      \"evidence\": \"KO mice, sleep deprivation, Htr2a qPCR\",\n      \"pmids\": [\"25857407\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter binding not shown in this study\", \"Behavioral consequence not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined an Egr2/Egr3-Ltbp3-TGF-β3 axis in regulatory T cells preventing humoral autoimmunity, with double KO ablating TGF-β3 production.\",\n      \"evidence\": \"T cell-specific double KO, adoptive transfer, TGF-β3 vector rescue, Ltbp3 analysis\",\n      \"pmids\": [\"27911796\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Ltbp3 promoter binding not detailed\", \"EGR3-only contribution not isolated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed Egr3 promotes myoblast proliferation and survival via NF-κB activity and suppression of caspase-dependent apoptosis.\",\n      \"evidence\": \"shRNA in C2C12, NF-κB reporter, apoptosis assays, caspase-inhibitor rescue\",\n      \"pmids\": [\"27576048\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct EGR3 targets in NF-κB/apoptosis pathway not mapped\", \"Single cell-line system\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established post-transcriptional control of EGR3, showing KSRP-driven miR-23a destabilizes EGR3 mRNA and that EGR3 promotes NSCLC migration and metastasis.\",\n      \"evidence\": \"KSRP manipulation, miRNA screening, 3'UTR reporter, in vivo metastasis\",\n      \"pmids\": [\"28847731\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"EGR3 transcriptional targets driving metastasis here not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified Bdnf as an Egr3-dependent activity-induced gene, showing seizure-induced Bdnf induction (exons IV/VI) is absent in Egr3-/- hippocampus.\",\n      \"evidence\": \"KO mice, ECS, microarray, qRT-PCR, in situ, promoter bioinformatics\",\n      \"pmids\": [\"29867393\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Promoter binding not confirmed by ChIP here\", \"Direct vs indirect regulation unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a tissue-differentiation role outside neurons and immunity, showing EGR3 drives late epidermal differentiation enhancers and the epidermal differentiation complex, with loss in parakeratotic skin.\",\n      \"evidence\": \"Immunohistochemistry, RNA-seq, ChIP-seq, enhancer RNA, co-expression analysis\",\n      \"pmids\": [\"30342896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals inducing epidermal EGR3 not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed sex-specific EGR3 regulation of cocaine relapse, with female-specific EGR3 reduction after abstinence and opposite behavioral effects of D2-MSN overexpression between sexes.\",\n      \"evidence\": \"Cocaine self-administration, EGR3 Western blot, A2A-Cre Egr3 overexpression, operant behavior\",\n      \"pmids\": [\"31858986\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of sex specificity unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a tumor-suppressive EGR3 program in prostate cancer, with direct activation of ZFP36, GADD45B, and SOCS3, suppression of EMT/invasion, and reduced bone metastasis.\",\n      \"evidence\": \"ChIP, luciferase, overexpression/knockdown, mouse bone metastasis model\",\n      \"pmids\": [\"32796959\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Context-dependent oncogenic vs suppressive roles across cancers not reconciled\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified RELN as a direct EGR3 target mediating its inhibition of neurite outgrowth, providing an epistatic neuronal pathway.\",\n      \"evidence\": \"ChIP, reporter assay, overexpression/RELN knockdown rescue in SH-SY5Y, microarray/IPA\",\n      \"pmids\": [\"33113163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance not tested\", \"Single cell-line system\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked EGR3 to cardiac fibrosis as a pro-fibrotic TGF-β-promoting factor repressed by miR-27a-5p.\",\n      \"evidence\": \"Luciferase 3'UTR validation, TAC model, miR-27a KO/inhibition, cardiac fibroblast culture\",\n      \"pmids\": [\"33215816\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct EGR3 transcriptional targets in fibrosis not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established an NF-κB→EGR3→HDAC6→IL-27 axis driving mast cell-dependent allergic inflammation, with miR-182-5p as a negative regulator.\",\n      \"evidence\": \"RNA-seq, ChIP for p65/EGR3, luciferase for miR-182-5p, anaphylaxis models\",\n      \"pmids\": [\"34234781\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability of HDAC6 axis to other immune contexts unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected EGR3 to mitochondrial dynamics in addiction, showing cocaine enhances Egr3 binding at PGC1α/Drp1 promoters in D1-MSNs to remodel mitochondrial morphology.\",\n      \"evidence\": \"ChIP in NAc, D1-MSN Egr3 knockdown, mRNA quantification, EM morphology\",\n      \"pmids\": [\"34187517\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect promoter regulation incompletely separated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Confirmed Htr2a as a direct in vivo EGR3 target through ChIP and reporter site mutagenesis, mechanistically grounding the sleep-deprivation/serotonin link.\",\n      \"evidence\": \"KO mice, sleep deprivation, in vivo ChIP, reporter with binding-site mutations, qPCR/protein\",\n      \"pmids\": [\"35001075\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Behavioral/psychiatric consequence of the EGR3–5-HT2AR axis not fully defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Broadened the activity-dependent EGR3 gene program to DNA-damage-response and AP-1 family genes (Gadd45b/g, Fos, Fosb, Mef2c, Calb2) after seizure.\",\n      \"evidence\": \"Hippocampal microarray of WT vs Egr3-/- after ECS, pathway analysis\",\n      \"pmids\": [\"35941129\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding to these promoters not validated\", \"Functional consequences not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified an EGR3–MCL1 axis conferring tamoxifen resistance in ERα+ breast cancer by suppressing apoptosis, with estrone upregulating EGR3.\",\n      \"evidence\": \"ChIP, dual luciferase, overexpression/knockdown, apoptosis assays, Western blot\",\n      \"pmids\": [\"37999751\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Clinical relevance to patient resistance not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined EGR3 as a conserved mechanosensitive endothelial transcription factor essential for cardiac valve morphogenesis, acting cell-autonomously via Nr4a2b, validated across zebrafish, porcine, and human systems.\",\n      \"evidence\": \"egr3 null zebrafish, tissue-specific tools, live imaging, mechanostimulation of valvular endothelial cells\",\n      \"pmids\": [\"38748804\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanotransduction pathway linking force to EGR3 induction not fully mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established EGR3 as a cortisol-repressed negative regulator of adipogenesis acting via HDAC6.\",\n      \"evidence\": \"Overexpression/knockdown in hADSCs and 3T3-L1, cortisol treatment, ChIP/reporter of HDAC6\",\n      \"pmids\": [\"38467615\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo metabolic phenotype of EGR3 manipulation not established\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How EGR3 selects opposite activator vs repressor outcomes and cell-type-specific target sets across its diverse contexts (D1 vs D2 neurons, oncogenic vs tumor-suppressive cancer roles) remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying determinant of EGR3 activator/repressor switching identified\", \"Cofactor-dependent target selection mechanism unknown\", \"No structural model of EGR3-cofactor complexes\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 7, 27, 29, 32, 34, 37]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 7, 14, 29, 32, 34]},\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 7, 27, 34]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 7, 27, 29, 32]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 15, 23, 32]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 5, 20, 37]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [10, 11, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"NAB2\", \"RORC\", \"CREB1\", \"SRF\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}