{"gene":"ELF3","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":1997,"finding":"ELF3 (ESE-1) was identified as an epithelium-specific ETS transcription factor containing an ETS DNA-binding domain and an A/T hook domain; it binds with high affinity to the ETS binding site in the SPRR2A promoter and transactivates SPRR2A and the Endo A enhancer, establishing its role as a transcriptional activator in epithelial differentiation.","method":"DNA binding assays, transactivation reporter assays, identification of protein domains","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — original functional characterization with DNA binding and transactivation assays showing direct promoter interaction","pmids":["9234700"],"is_preprint":false},{"year":2000,"finding":"ELF3 (ESE-1) interacts physically with the p50 subunit of NF-κB, and co-transfection of ELF3 with p50 and p65 NF-κB subunits synergistically enhances transactivation of the NOS2 promoter; site-directed mutagenesis of the ELF3 binding site in the NOS2 promoter abolishes ELF3-mediated transactivation.","method":"Co-immunoprecipitation, reporter transactivation assays, site-directed mutagenesis, co-transfection","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — direct binding to NF-κB p50, mutagenesis of binding site, multiple orthogonal methods in single study","pmids":["11036073"],"is_preprint":false},{"year":2000,"finding":"ELF3 is expressed in mouse corneal epithelium and immortalized human corneal epithelial cells (HCE), is upregulated upon differentiation, transactivates through the regulatory element of cornea-specific K12 keratin, and introduction of ELF3 antisense RNA affects HCE cell differentiation.","method":"Reporter transactivation assays, antisense RNA knockdown, immunostaining","journal":"Mechanisms of development","confidence":"Medium","confidence_rationale":"Tier 2 — functional knockdown and transactivation assay, single lab","pmids":["11025204"],"is_preprint":false},{"year":2003,"finding":"ELF3 (Ese-1) functionally cooperates with the largest Skn-1 isoform (Skn-1a) through an N-terminal pointed-like domain in Skn-1a to induce SPRR2A expression during keratinocyte terminal differentiation; this cooperativity is not found for the smaller isoform Skn-1d1.","method":"Transfection/reporter assays, domain deletion analysis, co-expression studies","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — domain mapping and functional cooperativity shown, single lab","pmids":["12624109"],"is_preprint":false},{"year":2004,"finding":"ELF3 (ESE-1) protein localizes to the cytoplasm in human breast cancer cells; its unique serine- and aspartic acid-rich (SAR) domain, acting in the cytoplasm, is necessary and sufficient to mediate mammary epithelial cell transformation via a non-transcriptional mechanism; nuclear targeting of ELF3 instead induces apoptosis via a transcription-dependent mechanism.","method":"Stable transfection, GFP localization, domain deletion and nuclear localization signal fusion, transformation assays, apoptosis assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods including domain mutagenesis, subcellular localization, and functional transformation assays","pmids":["15169914"],"is_preprint":false},{"year":2004,"finding":"Stable overexpression of ELF3 (ESX) in MCF-12A mammary epithelial cells induces EGF-independent proliferation, serum-independent MAPK phosphorylation, growth in soft agar, increased cell motility and invasion, and epithelial-to-mesenchymal transition, demonstrating that ELF3 alone can confer transformation and an in vitro metastatic phenotype.","method":"Stable transfection, colony formation, soft agar assay, invasion assay, 3D culture morphology","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal functional assays in single study establishing oncogenic role","pmids":["14767472"],"is_preprint":false},{"year":2005,"finding":"ELF3 (ESE-1) binds to several ETS sites on the COX-2 promoter in monocytes/macrophages and activates COX-2 expression in response to LPS; mutation of ETS sites in the COX-2 promoter or overexpression of a dominant-negative ESE-1 inhibits LPS-mediated COX-2 induction; the effect is further enhanced by cooperation with NF-κB and NFAT.","method":"Reporter assays, mutagenesis of ETS sites, dominant-negative overexpression, co-transfection","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1–2 — direct promoter binding, mutagenesis, dominant-negative, multiple conditions","pmids":["15794755"],"is_preprint":false},{"year":2008,"finding":"ELF3 (ESE-1) is induced in chondrocytes by IL-1β and binds to tandem ETS sites at -403/-381 bp on the COL2A1 promoter (confirmed by ChIP), acting as a potent transcriptional suppressor of COL2A1 promoter activity; this is specific to ELF3 among ETS factors tested and accounts for sustained NF-κB-dependent inhibition of COL2A1 by IL-1β.","method":"Transient transfection reporter assays, siRNA knockdown, ChIP, promoter deletion analysis","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 1–2 — in vivo ChIP confirmation of promoter binding, siRNA, and reporter assays","pmids":["18044710"],"is_preprint":false},{"year":2008,"finding":"ELF3 negatively regulates MMP-9 promoter activity via an ETS binding site, suppressing MMP-9 expression and invasion activity in oral squamous cell carcinoma cells.","method":"Transfection, luciferase reporter assay, mutation analysis, gelatin zymography, invasion assay","journal":"Oral diseases","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter mutagenesis and functional assay, single lab","pmids":["18302674"],"is_preprint":false},{"year":2011,"finding":"Elf3-knockout mice show impaired IL-6 and IL-12p40 production in dendritic cells in response to inflammatory stimuli, resulting in defective Th1 priming and exaggerated Th2 differentiation, establishing ELF3 as a regulator of dendritic cell-driven T cell differentiation in allergic airway inflammation.","method":"Elf3 knockout mouse model, cytokine measurement, T cell differentiation assays, in vivo OVA sensitization","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — clean KO mouse with defined cellular phenotype and mechanistic pathway placement","pmids":["21948981"],"is_preprint":false},{"year":2011,"finding":"ELF3 maps downstream of CCA1 in the circadian clock: CCA1 represses ELF3 by directly binding its promoter; ELF3 in turn mediates repression of PIF4 and PIF5 to control hypocotyl elongation; CCA1 and ELF3 also cooperate or act in parallel through the CONSTANS/FT pathway in flowering regulation.","method":"ChIP, genetic epistasis, promoter binding, qRT-PCR, double-mutant analysis","journal":"Plant physiology","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP of CCA1 at ELF3 promoter plus genetic epistasis across multiple phenotypes","pmids":["22190341"],"is_preprint":false},{"year":2013,"finding":"ELF3 physically interacts with androgen receptor (AR) and represses AR transcriptional activity; this interaction inhibits AR recruitment to androgen response elements in target gene promoters; ELF3 knockdown increases AR activity and promotes cell migration, while ELF3 overexpression inhibits tumor growth in vitro and in xenograft models.","method":"Reporter transfection assays, co-immunoprecipitation, ChIP, siRNA knockdown, xenograft model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ChIP, functional KD/OE with defined pathway placement","pmids":["23435425"],"is_preprint":false},{"year":2013,"finding":"ELF3 is identified as an early transcriptional regulator of human urothelial differentiation; ELF3 knockdown in normal human urothelial (NHU) cells reduces expression of FOXA1 and GRHL3 transcription factors in response to PPARγ activation, impairs uroplakin 3a expression, and compromises development and regeneration of urothelial barrier function.","method":"siRNA knockdown, gene expression analysis, barrier function assay, immunohistochemistry","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined pathway placement and multiple downstream readouts, single lab","pmids":["24374157"],"is_preprint":false},{"year":2016,"finding":"ELF3 silencing in normal human epithelial cells enhances their motility and invasion, establishing ELF3 as a functional tumor suppressor with a direct role in restricting epithelial cell migration.","method":"siRNA silencing, motility and invasion assays in human epithelial cells","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 — functional KD with specific phenotypic readout in relevant human cells","pmids":["26806338"],"is_preprint":false},{"year":2016,"finding":"ELF3 represses COL2A1 transcription in chondrocytes by interfering with CBP/p300 and SOX9 activator functions: ELF3 directly interacts with the HMG domain of SOX9 and overexpression of ELF3 significantly decreases SOX9/CBP-dependent histone acetyltransferase (HAT) activity.","method":"Co-transfection, co-immunoprecipitation (truncated Sox9 fragments), HAT activity assay, reporter assays","journal":"Connective tissue research","confidence":"High","confidence_rationale":"Tier 1–2 — direct protein interaction mapping with domain-truncation co-IP plus enzymatic (HAT) activity assay","pmids":["27310669"],"is_preprint":false},{"year":2019,"finding":"ELF3 (Elf3) induces upregulation of the TGF-β receptor II (RII) in cultured podocytes upon AGE stimulation and subsequently activates Smad3 signaling leading to podocyte injury; AGE treatment also induces secretion of Elf3-containing exosomes from podocytes dependent on TGF-β-Smad3 signaling.","method":"siRNA/overexpression, Western blotting, Smad3 knockout mice, exosome isolation, urine assays in patients","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — functional KD/KO with defined pathway placement and in vivo validation, single lab","pmids":["31150422"],"is_preprint":false},{"year":2019,"finding":"ELF3 is required for mesenchymal-to-epithelial transition (MET): depletion of Elf3 at MET onset impairs progression to epithelial state with loss of E-cadherin at the plasma membrane; during MET, ELF3 binds the Grhl3 promoter and activates its expression.","method":"siRNA knockdown, immunofluorescence, ChIP/promoter binding, cell morphology assays","journal":"Cells","confidence":"High","confidence_rationale":"Tier 2 — functional KD with specific MET phenotype plus direct promoter binding (ChIP)","pmids":["31404945"],"is_preprint":false},{"year":2020,"finding":"ELF3 interacts with the histone methyltransferase SET8 and both ELF3 and H4K20me1 (the SET8 downstream mark) are enriched at the MARK4 promoter; in high glucose conditions, ELF3 upregulation combined with SET8 downregulation drives MARK4 expression and NLRP3 inflammasome activation in vascular endothelial cells.","method":"Co-immunoprecipitation, ChIP, luciferase reporter assay, siRNA, overexpression","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP for physical interaction, ChIP for promoter occupancy, single lab","pmids":["32439949"],"is_preprint":false},{"year":2021,"finding":"ELF3 binds to the HLA-C proximal promoter and is required for high-level HLA-C expression on extravillous trophoblasts; ELF3 also binds its own promoter creating an autoregulatory feedback loop; ELF3 cooperates with its coactivator MED23, and disruption of ELF3-MED23 interaction by wrenchnolol downregulates HLA-C expression.","method":"ChIP-PCR, siRNA knockdown, wrenchnolol treatment, ATAC-seq, JQ1 treatment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP confirming ELF3 binding, siRNA and small-molecule inhibitor with specific HLA-C phenotype, autoregulatory loop demonstrated","pmids":["33622787"],"is_preprint":false},{"year":2022,"finding":"ELF3 functions as a transcription factor for IGF1: under hypoxia in ovarian cancer cells, ELF3 drives transcription of IGF1, increasing IGF1 and VEGF secretion, promoting endothelial cell proliferation, migration, and tumor angiogenesis; ELF3 silencing attenuates angiogenesis in ex vivo and xenograft models.","method":"siRNA knockdown, reporter assay, ChIP, ex vivo angiogenesis assay, xenograft model","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — ChIP confirmation of ELF3 binding to IGF1 promoter, functional KD in vitro and in vivo","pmids":["35695065"],"is_preprint":false},{"year":2022,"finding":"ELF3 directly binds the SLC31A1 (copper transporter) promoter and transcriptionally activates SLC31A1 expression, leading to copper imbalance, cuproptosis, and mitochondrial dysfunction in cisplatin-induced acute kidney injury.","method":"Luciferase reporter assay, ChIP, siRNA knockdown, overexpression, in vivo AKI mouse model","journal":"Chemico-biological interactions","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter assay for direct promoter binding, supported by in vivo KD, single lab","pmids":["38462020"],"is_preprint":false},{"year":2022,"finding":"ELF3 acts as an antagonist of ZEB1 (EMT-TF) expression: ELF3 expression is reduced in response to Wnt and RAS oncogenic signaling and its loss correlates with increased ZEB1 and EMT markers in colorectal cancer; ELF3 loss-of-function (siRNA) increases ZEB1 expression.","method":"RNA-Seq, siRNA knockdown, Western blotting, tumor panel IHC, TCGA analysis","journal":"Cancer biology & therapy","confidence":"Medium","confidence_rationale":"Tier 3 — siRNA KD with pathway placement via expression correlation, limited direct mechanistic follow-up","pmids":["30148686"],"is_preprint":false},{"year":2023,"finding":"ELF3 expression is induced synergistically by IL-17A and TNF in synovial fibroblasts via NF-κB signaling and requires IκBζ synthesis; ELF3 in turn drives expression of cytokines and matrix metalloproteinases, and overexpression of ELF3 or IκBζ synergizes with TNF to upregulate CCL8.","method":"siRNA knockdown, overexpression, signaling inhibitors, qRT-PCR, co-transfection in HEK293 cells","journal":"Rheumatology (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 — clean siRNA and OE with defined pathway placement (IκBζ requirement), multiple cell types","pmids":["35792833"],"is_preprint":false},{"year":2024,"finding":"WTAP m6A methyltransferase directly targets ELF3 mRNA and promotes its expression in an m6A-dependent manner during cellular senescence; ELF3 then drives senescence-associated secretory phenotype (SASP) by directly binding the IRF8 promoter at a specific site (-817 to -804) and activating IRF8 transcription.","method":"m6A sequencing/MeRIP, WTAP KD/OE, ELF3 KD/OE, ChIP/luciferase reporter for IRF8 promoter binding, proteomics, in vivo skin aging model","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 — m6A modification directly mapped to ELF3 mRNA, ChIP for IRF8 promoter binding, functional cascade validated in vivo","pmids":["38481803"],"is_preprint":false}],"current_model":"ELF3 is an epithelium-specific ETS transcription factor that activates or represses target gene promoters (including SPRR2A, NOS2, COX-2, COL2A1, MMP-9, IGF1, SLC31A1, HLA-C, and IRF8) via direct DNA binding through its ETS domain, physically interacts with co-regulators including NF-κB p50, SOX9/CBP/p300, androgen receptor, SET8, and MED23 to modulate their activity, can act through a non-transcriptional cytoplasmic mechanism via its SAR domain to drive mammary cell transformation, is regulated post-transcriptionally by WTAP-mediated m6A modification and by ubiquitin-proteasome degradation, and coordinates epithelial identity by promoting MET (in part through activating GRHL3) and repressing EMT factors such as ZEB1."},"narrative":{"teleology":[{"year":1997,"claim":"Identification of ELF3 as an epithelium-specific ETS factor that directly binds and transactivates the SPRR2A promoter established its fundamental role as a transcriptional activator in epithelial differentiation.","evidence":"DNA binding assays and reporter transactivation in epithelial cells","pmids":["9234700"],"confidence":"High","gaps":["Endogenous target gene repertoire unknown","No in vivo loss-of-function data","Mechanism of epithelial restriction of expression undefined"]},{"year":2000,"claim":"Demonstration that ELF3 physically interacts with NF-κB p50 and synergistically activates the NOS2 promoter revealed its role as a co-activator in inflammatory transcription, extending its function beyond simple ETS-site binding.","evidence":"Co-immunoprecipitation, site-directed mutagenesis of ETS site, reporter assays","pmids":["11036073"],"confidence":"High","gaps":["Whether ELF3-NF-κB interaction is direct or bridged is not resolved at structural level","Generality of ELF3-NF-κB cooperativity across other inflammatory promoters untested at that time"]},{"year":2004,"claim":"Discovery that ELF3's cytoplasmic SAR domain drives mammary cell transformation independently of transcription, while nuclear ELF3 induces apoptosis, revealed a dual-function architecture separating oncogenic and tumor-suppressive activities by subcellular compartment.","evidence":"Domain deletions, NLS fusions, GFP localization, transformation and apoptosis assays in breast epithelial cells","pmids":["15169914","14767472"],"confidence":"High","gaps":["Cytoplasmic binding partners and signaling pathway engaged by SAR domain unidentified","Structural basis of SAR-mediated transformation unknown","Context determining nuclear vs. cytoplasmic localization in tumors undefined"]},{"year":2005,"claim":"Showing that ELF3 binds ETS sites in the COX-2 promoter and is required for LPS-induced COX-2 expression in macrophages extended its inflammatory role to prostaglandin signaling and innate immunity.","evidence":"Reporter assays, ETS-site mutagenesis, dominant-negative ELF3, co-transfection with NF-κB/NFAT","pmids":["15794755"],"confidence":"High","gaps":["Direct ChIP at endogenous COX-2 locus not performed in this study","Role in myeloid lineage vs. epithelial lineage regulation not delineated"]},{"year":2008,"claim":"ChIP-validated binding of ELF3 to the COL2A1 promoter in IL-1β-stimulated chondrocytes, combined with its identification as a potent transcriptional repressor of COL2A1, established ELF3 as a mediator of cartilage matrix destruction in inflammation.","evidence":"ChIP, siRNA, reporter assays in chondrocytes","pmids":["18044710"],"confidence":"High","gaps":["Whether ELF3 repression is direct or via co-repressor recruitment was unresolved at that time"]},{"year":2011,"claim":"Elf3-knockout mice revealed a non-epithelial immune function: defective IL-6/IL-12p40 production in dendritic cells skewed T cell differentiation toward Th2, establishing ELF3 as a regulator of innate-adaptive immune crosstalk.","evidence":"Elf3-null mice, OVA sensitization, cytokine measurement, T cell differentiation assays","pmids":["21948981"],"confidence":"High","gaps":["Direct transcriptional targets in dendritic cells not identified by ChIP","Whether this reflects a cell-intrinsic DC defect vs. microenvironmental effect not fully resolved"]},{"year":2013,"claim":"Identification of ELF3 as a physical interactor and functional repressor of androgen receptor, together with its role as an early regulator of urothelial differentiation upstream of FOXA1 and GRHL3, broadened its activity to hormone-receptor modulation and multi-lineage epithelial specification.","evidence":"Reciprocal Co-IP, ChIP for AR recruitment, xenograft tumor growth (AR); siRNA in normal human urothelial cells with barrier function assays (differentiation)","pmids":["23435425","24374157"],"confidence":"High","gaps":["Structural basis of ELF3-AR interaction unknown","Whether ELF3 regulation of FOXA1 is direct or indirect not determined"]},{"year":2016,"claim":"Mapping the ELF3-SOX9 physical interaction to the SOX9 HMG domain and showing that ELF3 inhibits CBP/p300 HAT activity resolved the mechanism of COL2A1 repression in cartilage as co-factor sequestration rather than direct transcriptional silencing.","evidence":"Domain-truncation Co-IP, HAT activity assay, reporter assays in chondrocytes","pmids":["27310669"],"confidence":"High","gaps":["Genome-wide impact of ELF3-mediated CBP/p300 inhibition unknown","In vivo cartilage phenotype of ELF3 gain-of-function not tested"]},{"year":2019,"claim":"ELF3 was shown to be required for mesenchymal-to-epithelial transition by directly binding and activating the GRHL3 promoter, placing it as a master regulator of MET upstream of the GRHL barrier-function program.","evidence":"siRNA at MET onset, ChIP at Grhl3 promoter, E-cadherin immunofluorescence","pmids":["31404945"],"confidence":"High","gaps":["Whether ELF3 activates GRHL3 in all epithelial MET contexts or only specific lineages unknown","Upstream signals activating ELF3 at MET onset not defined"]},{"year":2021,"claim":"Discovery that ELF3 binds its own promoter and cooperates with MED23 to drive HLA-C expression on extravillous trophoblasts revealed an autoregulatory loop and linked ELF3 to immune tolerance at the maternal-fetal interface.","evidence":"ChIP-PCR, siRNA, wrenchnolol disruption of ELF3-MED23, ATAC-seq in trophoblasts","pmids":["33622787"],"confidence":"High","gaps":["Structural basis of ELF3-MED23 interaction unknown","Whether autoregulatory loop operates in other epithelial contexts untested"]},{"year":2022,"claim":"Identification of ELF3 as a direct transcriptional activator of IGF1 under hypoxia and of SLC31A1 in kidney injury expanded the target gene repertoire to angiogenesis and copper homeostasis, while demonstration that ELF3 represses ZEB1 confirmed its role as an EMT antagonist.","evidence":"ChIP at IGF1 and SLC31A1 promoters, xenograft angiogenesis models, siRNA with ZEB1 expression analysis","pmids":["35695065","38462020","30148686"],"confidence":"Medium","gaps":["ZEB1 repression mechanism (direct vs. indirect) not resolved","Whether SLC31A1 activation is a general ELF3 function or injury-specific unknown","Single-lab validation for SLC31A1 and ZEB1 findings"]},{"year":2024,"claim":"Demonstration that WTAP-mediated m6A modification of ELF3 mRNA controls its expression, and that ELF3 directly activates IRF8 transcription to drive senescence-associated secretory phenotype, established the first post-transcriptional regulatory input and linked ELF3 to cellular aging.","evidence":"MeRIP-seq, WTAP KD/OE, ChIP at IRF8 promoter, in vivo skin aging model","pmids":["38481803"],"confidence":"Medium","gaps":["Whether m6A regulation of ELF3 operates in non-senescence contexts unknown","Reader protein mediating m6A-dependent ELF3 stabilization not identified","Single-lab finding awaiting independent confirmation"]},{"year":null,"claim":"The cytoplasmic signaling mechanism of the SAR domain, the full genome-wide direct target repertoire determined by unbiased ChIP-seq across epithelial lineages, and the structural basis of ELF3 interactions with its diverse co-regulators remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No genome-wide ChIP-seq published defining the complete ELF3 cistrome","Cytoplasmic SAR domain effectors and signaling pathway remain unidentified","No crystal or cryo-EM structure of ELF3 or its complexes available"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,6,7,18,19,20,23]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,6,7,11,14,16,18,19,20,23]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,4,7,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,6,7,11,14,18,19,20,23]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,6,9,22]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,11,15,19]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,12,16]}],"complexes":[],"partners":["NFKB1","SOX9","AR","SET8","MED23","CREBBP","EP300","GRHL3"],"other_free_text":[]},"mechanistic_narrative":"ELF3 is an epithelium-restricted ETS transcription factor that coordinates epithelial identity, differentiation, and inflammatory gene expression across diverse tissues. It activates or represses target promoters—including SPRR2A, NOS2, COX-2, COL2A1, HLA-C, IGF1, SLC31A1, and IRF8—by binding ETS motifs directly, and modulates chromatin and co-factor activities through physical interactions with NF-κB p50, SOX9/CBP/p300, androgen receptor, SET8, and MED23 [PMID:9234700, PMID:11036073, PMID:27310669, PMID:33622787]. ELF3 enforces the epithelial state by promoting mesenchymal-to-epithelial transition through transcriptional activation of GRHL3 and repression of the EMT factor ZEB1 [PMID:31404945, PMID:30148686]. Beyond its nuclear function, ELF3 possesses a cytoplasmic SAR domain that is necessary and sufficient to drive mammary epithelial cell transformation through a transcription-independent mechanism, while forced nuclear localization instead triggers apoptosis [PMID:15169914]. ELF3 mRNA is post-transcriptionally regulated by WTAP-mediated m6A modification, linking epitranscriptomic control to ELF3-dependent senescence-associated secretory phenotype programs via IRF8 [PMID:38481803]."},"prefetch_data":{"uniprot":{"accession":"P78545","full_name":"ETS-related transcription factor Elf-3","aliases":["E74-like factor 3","Epithelial-restricted with serine box","Epithelium-restricted Ets protein ESX","Epithelium-specific Ets transcription factor 1","ESE-1"],"length_aa":371,"mass_kda":41.5,"function":"Transcriptional activator that binds and transactivates ETS sequences containing the consensus nucleotide core sequence GGA[AT]. Acts synergistically with POU2F3 to transactivate the SPRR2A promoter and with RUNX1 to transactivate the ANGPT1 promoter. Also transactivates collagenase, CCL20, CLND7, FLG, KRT8, NOS2, PTGS2, SPRR2B, TGFBR2 and TGM3 promoters. Represses KRT4 promoter activity. Involved in mediating vascular inflammation. May play an important role in epithelial cell differentiation and tumorigenesis. May be a critical downstream effector of the ERBB2 signaling pathway. May be associated with mammary gland development and involution. Plays an important role in the regulation of transcription with TATA-less promoters in preimplantation embryos, which is essential in preimplantation development (By similarity)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P78545/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ELF3","classification":"Not Classified","n_dependent_lines":18,"n_total_lines":1208,"dependency_fraction":0.014900662251655629},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ELF3","total_profiled":1310},"omim":[{"mim_id":"609596","title":"EUKARYOTIC TRANSLATION INITIATION FACTOR 3, SUBUNIT K; EIF3K","url":"https://www.omim.org/entry/609596"},{"mim_id":"607394","title":"POU DOMAIN, CLASS 2, TRANSCRIPTION FACTOR 3; POU2F3","url":"https://www.omim.org/entry/607394"},{"mim_id":"605439","title":"ETS HOMOLOGOUS FACTOR; EHF","url":"https://www.omim.org/entry/605439"},{"mim_id":"603956","title":"CERVICAL CANCER","url":"https://www.omim.org/entry/603956"},{"mim_id":"602191","title":"E74-LIKE ETS TRANSCRIPTION FACTOR 3; ELF3","url":"https://www.omim.org/entry/602191"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"esophagus","ntpm":229.3}],"url":"https://www.proteinatlas.org/search/ELF3"},"hgnc":{"alias_symbol":["EPR-1","ESE-1","ERT"],"prev_symbol":["ESX"]},"alphafold":{"accession":"P78545","domains":[{"cath_id":"1.10.150.50","chopping":"1-14_60-134","consensus_level":"medium","plddt":75.8346,"start":1,"end":134},{"cath_id":"1.10.10.10","chopping":"274-368","consensus_level":"high","plddt":89.9661,"start":274,"end":368}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P78545","model_url":"https://alphafold.ebi.ac.uk/files/AF-P78545-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P78545-F1-predicted_aligned_error_v6.png","plddt_mean":64.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ELF3","jax_strain_url":"https://www.jax.org/strain/search?query=ELF3"},"sequence":{"accession":"P78545","fasta_url":"https://rest.uniprot.org/uniprotkb/P78545.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P78545/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P78545"}},"corpus_meta":[{"pmid":"32848244","id":"PMC_32848244","title":"A 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marinum.","date":"2022","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/36409073","citation_count":18,"is_preprint":false},{"pmid":"30528231","id":"PMC_30528231","title":"The lncRNA ELF3-AS1 promotes bladder cancer progression by interaction with Krüppel-like factor 8.","date":"2018","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/30528231","citation_count":18,"is_preprint":false},{"pmid":"27723420","id":"PMC_27723420","title":"Listeria monocytogenes encodes a functional ESX-1 secretion system whose expression is detrimental to in vivo infection.","date":"2016","source":"Virulence","url":"https://pubmed.ncbi.nlm.nih.gov/27723420","citation_count":18,"is_preprint":false},{"pmid":"35005535","id":"PMC_35005535","title":"Crosstalk between the ancestral type VII secretion system ESX-4 and other T7SS in Mycobacterium 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domain; it binds with high affinity to the ETS binding site in the SPRR2A promoter and transactivates SPRR2A and the Endo A enhancer, establishing its role as a transcriptional activator in epithelial differentiation.\",\n      \"method\": \"DNA binding assays, transactivation reporter assays, identification of protein domains\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original functional characterization with DNA binding and transactivation assays showing direct promoter interaction\",\n      \"pmids\": [\"9234700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ELF3 (ESE-1) interacts physically with the p50 subunit of NF-κB, and co-transfection of ELF3 with p50 and p65 NF-κB subunits synergistically enhances transactivation of the NOS2 promoter; site-directed mutagenesis of the ELF3 binding site in the NOS2 promoter abolishes ELF3-mediated transactivation.\",\n      \"method\": \"Co-immunoprecipitation, reporter transactivation assays, site-directed mutagenesis, co-transfection\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct binding to NF-κB p50, mutagenesis of binding site, multiple orthogonal methods in single study\",\n      \"pmids\": [\"11036073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"ELF3 is expressed in mouse corneal epithelium and immortalized human corneal epithelial cells (HCE), is upregulated upon differentiation, transactivates through the regulatory element of cornea-specific K12 keratin, and introduction of ELF3 antisense RNA affects HCE cell differentiation.\",\n      \"method\": \"Reporter transactivation assays, antisense RNA knockdown, immunostaining\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional knockdown and transactivation assay, single lab\",\n      \"pmids\": [\"11025204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ELF3 (Ese-1) functionally cooperates with the largest Skn-1 isoform (Skn-1a) through an N-terminal pointed-like domain in Skn-1a to induce SPRR2A expression during keratinocyte terminal differentiation; this cooperativity is not found for the smaller isoform Skn-1d1.\",\n      \"method\": \"Transfection/reporter assays, domain deletion analysis, co-expression studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping and functional cooperativity shown, single lab\",\n      \"pmids\": [\"12624109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ELF3 (ESE-1) protein localizes to the cytoplasm in human breast cancer cells; its unique serine- and aspartic acid-rich (SAR) domain, acting in the cytoplasm, is necessary and sufficient to mediate mammary epithelial cell transformation via a non-transcriptional mechanism; nuclear targeting of ELF3 instead induces apoptosis via a transcription-dependent mechanism.\",\n      \"method\": \"Stable transfection, GFP localization, domain deletion and nuclear localization signal fusion, transformation assays, apoptosis assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including domain mutagenesis, subcellular localization, and functional transformation assays\",\n      \"pmids\": [\"15169914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Stable overexpression of ELF3 (ESX) in MCF-12A mammary epithelial cells induces EGF-independent proliferation, serum-independent MAPK phosphorylation, growth in soft agar, increased cell motility and invasion, and epithelial-to-mesenchymal transition, demonstrating that ELF3 alone can confer transformation and an in vitro metastatic phenotype.\",\n      \"method\": \"Stable transfection, colony formation, soft agar assay, invasion assay, 3D culture morphology\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays in single study establishing oncogenic role\",\n      \"pmids\": [\"14767472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ELF3 (ESE-1) binds to several ETS sites on the COX-2 promoter in monocytes/macrophages and activates COX-2 expression in response to LPS; mutation of ETS sites in the COX-2 promoter or overexpression of a dominant-negative ESE-1 inhibits LPS-mediated COX-2 induction; the effect is further enhanced by cooperation with NF-κB and NFAT.\",\n      \"method\": \"Reporter assays, mutagenesis of ETS sites, dominant-negative overexpression, co-transfection\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct promoter binding, mutagenesis, dominant-negative, multiple conditions\",\n      \"pmids\": [\"15794755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ELF3 (ESE-1) is induced in chondrocytes by IL-1β and binds to tandem ETS sites at -403/-381 bp on the COL2A1 promoter (confirmed by ChIP), acting as a potent transcriptional suppressor of COL2A1 promoter activity; this is specific to ELF3 among ETS factors tested and accounts for sustained NF-κB-dependent inhibition of COL2A1 by IL-1β.\",\n      \"method\": \"Transient transfection reporter assays, siRNA knockdown, ChIP, promoter deletion analysis\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vivo ChIP confirmation of promoter binding, siRNA, and reporter assays\",\n      \"pmids\": [\"18044710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ELF3 negatively regulates MMP-9 promoter activity via an ETS binding site, suppressing MMP-9 expression and invasion activity in oral squamous cell carcinoma cells.\",\n      \"method\": \"Transfection, luciferase reporter assay, mutation analysis, gelatin zymography, invasion assay\",\n      \"journal\": \"Oral diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter mutagenesis and functional assay, single lab\",\n      \"pmids\": [\"18302674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Elf3-knockout mice show impaired IL-6 and IL-12p40 production in dendritic cells in response to inflammatory stimuli, resulting in defective Th1 priming and exaggerated Th2 differentiation, establishing ELF3 as a regulator of dendritic cell-driven T cell differentiation in allergic airway inflammation.\",\n      \"method\": \"Elf3 knockout mouse model, cytokine measurement, T cell differentiation assays, in vivo OVA sensitization\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO mouse with defined cellular phenotype and mechanistic pathway placement\",\n      \"pmids\": [\"21948981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ELF3 maps downstream of CCA1 in the circadian clock: CCA1 represses ELF3 by directly binding its promoter; ELF3 in turn mediates repression of PIF4 and PIF5 to control hypocotyl elongation; CCA1 and ELF3 also cooperate or act in parallel through the CONSTANS/FT pathway in flowering regulation.\",\n      \"method\": \"ChIP, genetic epistasis, promoter binding, qRT-PCR, double-mutant analysis\",\n      \"journal\": \"Plant physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP of CCA1 at ELF3 promoter plus genetic epistasis across multiple phenotypes\",\n      \"pmids\": [\"22190341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ELF3 physically interacts with androgen receptor (AR) and represses AR transcriptional activity; this interaction inhibits AR recruitment to androgen response elements in target gene promoters; ELF3 knockdown increases AR activity and promotes cell migration, while ELF3 overexpression inhibits tumor growth in vitro and in xenograft models.\",\n      \"method\": \"Reporter transfection assays, co-immunoprecipitation, ChIP, siRNA knockdown, xenograft model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ChIP, functional KD/OE with defined pathway placement\",\n      \"pmids\": [\"23435425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ELF3 is identified as an early transcriptional regulator of human urothelial differentiation; ELF3 knockdown in normal human urothelial (NHU) cells reduces expression of FOXA1 and GRHL3 transcription factors in response to PPARγ activation, impairs uroplakin 3a expression, and compromises development and regeneration of urothelial barrier function.\",\n      \"method\": \"siRNA knockdown, gene expression analysis, barrier function assay, immunohistochemistry\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined pathway placement and multiple downstream readouts, single lab\",\n      \"pmids\": [\"24374157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ELF3 silencing in normal human epithelial cells enhances their motility and invasion, establishing ELF3 as a functional tumor suppressor with a direct role in restricting epithelial cell migration.\",\n      \"method\": \"siRNA silencing, motility and invasion assays in human epithelial cells\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional KD with specific phenotypic readout in relevant human cells\",\n      \"pmids\": [\"26806338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ELF3 represses COL2A1 transcription in chondrocytes by interfering with CBP/p300 and SOX9 activator functions: ELF3 directly interacts with the HMG domain of SOX9 and overexpression of ELF3 significantly decreases SOX9/CBP-dependent histone acetyltransferase (HAT) activity.\",\n      \"method\": \"Co-transfection, co-immunoprecipitation (truncated Sox9 fragments), HAT activity assay, reporter assays\",\n      \"journal\": \"Connective tissue research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct protein interaction mapping with domain-truncation co-IP plus enzymatic (HAT) activity assay\",\n      \"pmids\": [\"27310669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ELF3 (Elf3) induces upregulation of the TGF-β receptor II (RII) in cultured podocytes upon AGE stimulation and subsequently activates Smad3 signaling leading to podocyte injury; AGE treatment also induces secretion of Elf3-containing exosomes from podocytes dependent on TGF-β-Smad3 signaling.\",\n      \"method\": \"siRNA/overexpression, Western blotting, Smad3 knockout mice, exosome isolation, urine assays in patients\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional KD/KO with defined pathway placement and in vivo validation, single lab\",\n      \"pmids\": [\"31150422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ELF3 is required for mesenchymal-to-epithelial transition (MET): depletion of Elf3 at MET onset impairs progression to epithelial state with loss of E-cadherin at the plasma membrane; during MET, ELF3 binds the Grhl3 promoter and activates its expression.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, ChIP/promoter binding, cell morphology assays\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional KD with specific MET phenotype plus direct promoter binding (ChIP)\",\n      \"pmids\": [\"31404945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ELF3 interacts with the histone methyltransferase SET8 and both ELF3 and H4K20me1 (the SET8 downstream mark) are enriched at the MARK4 promoter; in high glucose conditions, ELF3 upregulation combined with SET8 downregulation drives MARK4 expression and NLRP3 inflammasome activation in vascular endothelial cells.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, luciferase reporter assay, siRNA, overexpression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP for physical interaction, ChIP for promoter occupancy, single lab\",\n      \"pmids\": [\"32439949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ELF3 binds to the HLA-C proximal promoter and is required for high-level HLA-C expression on extravillous trophoblasts; ELF3 also binds its own promoter creating an autoregulatory feedback loop; ELF3 cooperates with its coactivator MED23, and disruption of ELF3-MED23 interaction by wrenchnolol downregulates HLA-C expression.\",\n      \"method\": \"ChIP-PCR, siRNA knockdown, wrenchnolol treatment, ATAC-seq, JQ1 treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP confirming ELF3 binding, siRNA and small-molecule inhibitor with specific HLA-C phenotype, autoregulatory loop demonstrated\",\n      \"pmids\": [\"33622787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ELF3 functions as a transcription factor for IGF1: under hypoxia in ovarian cancer cells, ELF3 drives transcription of IGF1, increasing IGF1 and VEGF secretion, promoting endothelial cell proliferation, migration, and tumor angiogenesis; ELF3 silencing attenuates angiogenesis in ex vivo and xenograft models.\",\n      \"method\": \"siRNA knockdown, reporter assay, ChIP, ex vivo angiogenesis assay, xenograft model\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP confirmation of ELF3 binding to IGF1 promoter, functional KD in vitro and in vivo\",\n      \"pmids\": [\"35695065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ELF3 directly binds the SLC31A1 (copper transporter) promoter and transcriptionally activates SLC31A1 expression, leading to copper imbalance, cuproptosis, and mitochondrial dysfunction in cisplatin-induced acute kidney injury.\",\n      \"method\": \"Luciferase reporter assay, ChIP, siRNA knockdown, overexpression, in vivo AKI mouse model\",\n      \"journal\": \"Chemico-biological interactions\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assay for direct promoter binding, supported by in vivo KD, single lab\",\n      \"pmids\": [\"38462020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ELF3 acts as an antagonist of ZEB1 (EMT-TF) expression: ELF3 expression is reduced in response to Wnt and RAS oncogenic signaling and its loss correlates with increased ZEB1 and EMT markers in colorectal cancer; ELF3 loss-of-function (siRNA) increases ZEB1 expression.\",\n      \"method\": \"RNA-Seq, siRNA knockdown, Western blotting, tumor panel IHC, TCGA analysis\",\n      \"journal\": \"Cancer biology & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — siRNA KD with pathway placement via expression correlation, limited direct mechanistic follow-up\",\n      \"pmids\": [\"30148686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ELF3 expression is induced synergistically by IL-17A and TNF in synovial fibroblasts via NF-κB signaling and requires IκBζ synthesis; ELF3 in turn drives expression of cytokines and matrix metalloproteinases, and overexpression of ELF3 or IκBζ synergizes with TNF to upregulate CCL8.\",\n      \"method\": \"siRNA knockdown, overexpression, signaling inhibitors, qRT-PCR, co-transfection in HEK293 cells\",\n      \"journal\": \"Rheumatology (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean siRNA and OE with defined pathway placement (IκBζ requirement), multiple cell types\",\n      \"pmids\": [\"35792833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WTAP m6A methyltransferase directly targets ELF3 mRNA and promotes its expression in an m6A-dependent manner during cellular senescence; ELF3 then drives senescence-associated secretory phenotype (SASP) by directly binding the IRF8 promoter at a specific site (-817 to -804) and activating IRF8 transcription.\",\n      \"method\": \"m6A sequencing/MeRIP, WTAP KD/OE, ELF3 KD/OE, ChIP/luciferase reporter for IRF8 promoter binding, proteomics, in vivo skin aging model\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — m6A modification directly mapped to ELF3 mRNA, ChIP for IRF8 promoter binding, functional cascade validated in vivo\",\n      \"pmids\": [\"38481803\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ELF3 is an epithelium-specific ETS transcription factor that activates or represses target gene promoters (including SPRR2A, NOS2, COX-2, COL2A1, MMP-9, IGF1, SLC31A1, HLA-C, and IRF8) via direct DNA binding through its ETS domain, physically interacts with co-regulators including NF-κB p50, SOX9/CBP/p300, androgen receptor, SET8, and MED23 to modulate their activity, can act through a non-transcriptional cytoplasmic mechanism via its SAR domain to drive mammary cell transformation, is regulated post-transcriptionally by WTAP-mediated m6A modification and by ubiquitin-proteasome degradation, and coordinates epithelial identity by promoting MET (in part through activating GRHL3) and repressing EMT factors such as ZEB1.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ELF3 is an epithelium-restricted ETS transcription factor that coordinates epithelial identity, differentiation, and inflammatory gene expression across diverse tissues. It activates or represses target promoters—including SPRR2A, NOS2, COX-2, COL2A1, HLA-C, IGF1, SLC31A1, and IRF8—by binding ETS motifs directly, and modulates chromatin and co-factor activities through physical interactions with NF-κB p50, SOX9/CBP/p300, androgen receptor, SET8, and MED23 [PMID:9234700, PMID:11036073, PMID:27310669, PMID:33622787]. ELF3 enforces the epithelial state by promoting mesenchymal-to-epithelial transition through transcriptional activation of GRHL3 and repression of the EMT factor ZEB1 [PMID:31404945, PMID:30148686]. Beyond its nuclear function, ELF3 possesses a cytoplasmic SAR domain that is necessary and sufficient to drive mammary epithelial cell transformation through a transcription-independent mechanism, while forced nuclear localization instead triggers apoptosis [PMID:15169914]. ELF3 mRNA is post-transcriptionally regulated by WTAP-mediated m6A modification, linking epitranscriptomic control to ELF3-dependent senescence-associated secretory phenotype programs via IRF8 [PMID:38481803].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of ELF3 as an epithelium-specific ETS factor that directly binds and transactivates the SPRR2A promoter established its fundamental role as a transcriptional activator in epithelial differentiation.\",\n      \"evidence\": \"DNA binding assays and reporter transactivation in epithelial cells\",\n      \"pmids\": [\"9234700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous target gene repertoire unknown\", \"No in vivo loss-of-function data\", \"Mechanism of epithelial restriction of expression undefined\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstration that ELF3 physically interacts with NF-κB p50 and synergistically activates the NOS2 promoter revealed its role as a co-activator in inflammatory transcription, extending its function beyond simple ETS-site binding.\",\n      \"evidence\": \"Co-immunoprecipitation, site-directed mutagenesis of ETS site, reporter assays\",\n      \"pmids\": [\"11036073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ELF3-NF-κB interaction is direct or bridged is not resolved at structural level\", \"Generality of ELF3-NF-κB cooperativity across other inflammatory promoters untested at that time\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Discovery that ELF3's cytoplasmic SAR domain drives mammary cell transformation independently of transcription, while nuclear ELF3 induces apoptosis, revealed a dual-function architecture separating oncogenic and tumor-suppressive activities by subcellular compartment.\",\n      \"evidence\": \"Domain deletions, NLS fusions, GFP localization, transformation and apoptosis assays in breast epithelial cells\",\n      \"pmids\": [\"15169914\", \"14767472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cytoplasmic binding partners and signaling pathway engaged by SAR domain unidentified\", \"Structural basis of SAR-mediated transformation unknown\", \"Context determining nuclear vs. cytoplasmic localization in tumors undefined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showing that ELF3 binds ETS sites in the COX-2 promoter and is required for LPS-induced COX-2 expression in macrophages extended its inflammatory role to prostaglandin signaling and innate immunity.\",\n      \"evidence\": \"Reporter assays, ETS-site mutagenesis, dominant-negative ELF3, co-transfection with NF-κB/NFAT\",\n      \"pmids\": [\"15794755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ChIP at endogenous COX-2 locus not performed in this study\", \"Role in myeloid lineage vs. epithelial lineage regulation not delineated\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"ChIP-validated binding of ELF3 to the COL2A1 promoter in IL-1β-stimulated chondrocytes, combined with its identification as a potent transcriptional repressor of COL2A1, established ELF3 as a mediator of cartilage matrix destruction in inflammation.\",\n      \"evidence\": \"ChIP, siRNA, reporter assays in chondrocytes\",\n      \"pmids\": [\"18044710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ELF3 repression is direct or via co-repressor recruitment was unresolved at that time\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Elf3-knockout mice revealed a non-epithelial immune function: defective IL-6/IL-12p40 production in dendritic cells skewed T cell differentiation toward Th2, establishing ELF3 as a regulator of innate-adaptive immune crosstalk.\",\n      \"evidence\": \"Elf3-null mice, OVA sensitization, cytokine measurement, T cell differentiation assays\",\n      \"pmids\": [\"21948981\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in dendritic cells not identified by ChIP\", \"Whether this reflects a cell-intrinsic DC defect vs. microenvironmental effect not fully resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of ELF3 as a physical interactor and functional repressor of androgen receptor, together with its role as an early regulator of urothelial differentiation upstream of FOXA1 and GRHL3, broadened its activity to hormone-receptor modulation and multi-lineage epithelial specification.\",\n      \"evidence\": \"Reciprocal Co-IP, ChIP for AR recruitment, xenograft tumor growth (AR); siRNA in normal human urothelial cells with barrier function assays (differentiation)\",\n      \"pmids\": [\"23435425\", \"24374157\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ELF3-AR interaction unknown\", \"Whether ELF3 regulation of FOXA1 is direct or indirect not determined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mapping the ELF3-SOX9 physical interaction to the SOX9 HMG domain and showing that ELF3 inhibits CBP/p300 HAT activity resolved the mechanism of COL2A1 repression in cartilage as co-factor sequestration rather than direct transcriptional silencing.\",\n      \"evidence\": \"Domain-truncation Co-IP, HAT activity assay, reporter assays in chondrocytes\",\n      \"pmids\": [\"27310669\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide impact of ELF3-mediated CBP/p300 inhibition unknown\", \"In vivo cartilage phenotype of ELF3 gain-of-function not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"ELF3 was shown to be required for mesenchymal-to-epithelial transition by directly binding and activating the GRHL3 promoter, placing it as a master regulator of MET upstream of the GRHL barrier-function program.\",\n      \"evidence\": \"siRNA at MET onset, ChIP at Grhl3 promoter, E-cadherin immunofluorescence\",\n      \"pmids\": [\"31404945\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ELF3 activates GRHL3 in all epithelial MET contexts or only specific lineages unknown\", \"Upstream signals activating ELF3 at MET onset not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that ELF3 binds its own promoter and cooperates with MED23 to drive HLA-C expression on extravillous trophoblasts revealed an autoregulatory loop and linked ELF3 to immune tolerance at the maternal-fetal interface.\",\n      \"evidence\": \"ChIP-PCR, siRNA, wrenchnolol disruption of ELF3-MED23, ATAC-seq in trophoblasts\",\n      \"pmids\": [\"33622787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ELF3-MED23 interaction unknown\", \"Whether autoregulatory loop operates in other epithelial contexts untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of ELF3 as a direct transcriptional activator of IGF1 under hypoxia and of SLC31A1 in kidney injury expanded the target gene repertoire to angiogenesis and copper homeostasis, while demonstration that ELF3 represses ZEB1 confirmed its role as an EMT antagonist.\",\n      \"evidence\": \"ChIP at IGF1 and SLC31A1 promoters, xenograft angiogenesis models, siRNA with ZEB1 expression analysis\",\n      \"pmids\": [\"35695065\", \"38462020\", \"30148686\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ZEB1 repression mechanism (direct vs. indirect) not resolved\", \"Whether SLC31A1 activation is a general ELF3 function or injury-specific unknown\", \"Single-lab validation for SLC31A1 and ZEB1 findings\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstration that WTAP-mediated m6A modification of ELF3 mRNA controls its expression, and that ELF3 directly activates IRF8 transcription to drive senescence-associated secretory phenotype, established the first post-transcriptional regulatory input and linked ELF3 to cellular aging.\",\n      \"evidence\": \"MeRIP-seq, WTAP KD/OE, ChIP at IRF8 promoter, in vivo skin aging model\",\n      \"pmids\": [\"38481803\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether m6A regulation of ELF3 operates in non-senescence contexts unknown\", \"Reader protein mediating m6A-dependent ELF3 stabilization not identified\", \"Single-lab finding awaiting independent confirmation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The cytoplasmic signaling mechanism of the SAR domain, the full genome-wide direct target repertoire determined by unbiased ChIP-seq across epithelial lineages, and the structural basis of ELF3 interactions with its diverse co-regulators remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No genome-wide ChIP-seq published defining the complete ELF3 cistrome\", \"Cytoplasmic SAR domain effectors and signaling pathway remain unidentified\", \"No crystal or cryo-EM structure of ELF3 or its complexes available\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 6, 7, 18, 19, 20, 23]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 6, 7, 11, 14, 16, 18, 19, 20, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 4, 7, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 6, 7, 11, 14, 18, 19, 20, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 6, 9, 22]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 11, 15, 19]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 12, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"NFKB1\",\n      \"SOX9\",\n      \"AR\",\n      \"SET8\",\n      \"MED23\",\n      \"CREBBP\",\n      \"EP300\",\n      \"GRHL3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}