{"gene":"ELF1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1992,"finding":"ELF-1 (Elf-1) was identified as a novel Ets-related transcription factor that binds specifically to two Ets binding sites (EBS1 and EBS2) in the IL-2 enhancer; in vitro mutagenesis showed that these sites are required for inducible IL-2 enhancer function, and neither Ets-1 nor Ets-2 bound these sites.","method":"Electrophoretic mobility shift assay (EMSA), methylation interference analysis, in vitro mutagenesis, low-stringency cDNA library screen","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding assays plus mutagenesis confirming functional requirement; foundational cloning paper with multiple orthogonal methods","pmids":["1545787"],"is_preprint":false},{"year":1992,"finding":"Elf-1 binds specifically to two purine-rich motifs in the HIV-2 enhancer, and mutagenesis of these Elf-1 binding sites abolishes inducible HIV-2 transcription following T-cell-receptor-mediated T-cell activation.","method":"EMSA, site-directed mutagenesis, transient transfection reporter assays","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis demonstrates functional requirement; multiple orthogonal methods in a focused study","pmids":["1527846"],"is_preprint":false},{"year":1993,"finding":"Elf-1 binds to the underphosphorylated (but not phosphorylated) form of the retinoblastoma protein (Rb) via a sequence motif homologous to viral oncoprotein Rb-binding sites, interacting with Rb's pocket region both in vitro and in vivo. After T cell activation, Rb phosphorylation releases Elf-1, correlating temporally with activation of Elf-1-mediated transcription. Overexpression of a phosphorylation-defective Rb inhibited Elf-1-dependent transcription.","method":"Co-immunoprecipitation, in vitro binding assays, overexpression of phosphorylation-defective Rb mutant, transcriptional reporter assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, in vitro binding, functional reporter assay with dominant-negative mutant; multiple orthogonal methods","pmids":["8493578"],"is_preprint":false},{"year":1993,"finding":"A single amino acid substitution (Lys→Thr) in conserved region III (CRIII) of the Ets domain of Ets1 confers selective binding to GGAA core-containing sites (the specificity of Elf1/E74); the reciprocal mutation in Elf1 confers ability to bind GGAT core-containing EBS. CRIII plays a key role in Ets domain recognition of the GGAA/T core motif.","method":"Site-directed mutagenesis of Ets domain, DNA binding assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — reciprocal mutagenesis in both proteins with functional binding readout; mechanistically definitive","pmids":["8255775"],"is_preprint":false},{"year":1993,"finding":"Elf-1 binds to adjacent AP-1 and Ets sites in the GM-CSF purine box 1 (PB1) element cooperatively with c-Fos and JunB; mutagenesis of either the Ets or AP-1 site abolishes binding of the inducible PB1 complex and transcriptional activation of the GM-CSF promoter in activated T cells.","method":"EMSA with specific antibodies, in vitro mutagenesis, transient transfection reporter assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — supershift EMSA identifies specific factors, mutagenesis confirms functional requirement, reporter assays validate transcriptional output","pmids":["8289796"],"is_preprint":false},{"year":1993,"finding":"Elf-1 binds to the purine-rich ets site in the HTLV-I enhancer (not Ets-1 as previously thought), and site-specific mutation of this site significantly diminishes inducible HTLV-I enhancer function in Jurkat T cells.","method":"EMSA, site-directed mutagenesis, transient transfection reporter assays","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus mutagenesis in single study; single lab","pmids":["8350410"],"is_preprint":false},{"year":1994,"finding":"ELF-1 was identified as a ligand for the Eph family receptor tyrosine kinases Mek4 and Sek; ELF-1 is membrane-bound via a phosphatidylinositol (GPI) tail, as demonstrated by its expression in cell lines and embryos.","method":"cDNA expression library screen with receptor-alkaline phosphatase fusion proteins (RAP in situ), sequence analysis, cell line expression studies","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct ligand-receptor identification using receptor fusion protein screen with in situ validation; foundational cloning paper","pmids":["7522971"],"is_preprint":false},{"year":1994,"finding":"Elf-1 binds to the Ets consensus site in a second CD4 enhancer 24 kb upstream of the CD4 promoter; mutation of this Ets site abolishes enhancer activity in T cells.","method":"EMSA, in vitro mutagenesis, transient transfection reporter assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA identifies Elf-1 as dominant binding factor, mutagenesis confirms functional requirement; single lab","pmids":["7935370"],"is_preprint":false},{"year":1995,"finding":"ELF-1 is expressed in a high-to-low gradient in the tectum while its receptor Mek4 is expressed in a complementary gradient in the retina; binding activity detected with alkaline phosphatase fusions of ELF-1 and Mek4 shows molecular complementarity of gradients in reciprocal fields, indicating roles in retinotectal map development.","method":"RNA in situ hybridization, receptor-alkaline phosphatase fusion binding assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding detected with fusion proteins plus expression gradient mapping; replicated concept across multiple labs","pmids":["7634327"],"is_preprint":false},{"year":1995,"finding":"Elf-1 (ELF-1) activates autophosphorylation of the Cek7 receptor tyrosine kinase; high-affinity binding (Kd ~1.7 × 10⁻¹⁰ M) was demonstrated between Elf-1 and the MDK1 (Eph family) receptor, and Elf-1 binding leads to autophosphorylation of MDK1 and tyrosine phosphorylation of a 62 kDa substrate.","method":"Scatchard binding analysis, receptor autophosphorylation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — quantitative binding and functional kinase activation assay; single lab","pmids":["7876076"],"is_preprint":false},{"year":1996,"finding":"ELF-1 acts as a repellent axon guidance factor in vitro for temporal but not nasal retinal axons; retroviral overexpression of ELF-1 in the tectum in vivo causes retinal axons to avoid ectopic ELF-1 patches and map abnormally, demonstrating topographically specific axon guidance.","method":"In vitro axon guidance assay, retroviral overexpression in vivo, retinal axon mapping","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro functional assay and in vivo gain-of-function with defined phenotypic readout; multiple orthogonal approaches","pmids":["8797822"],"is_preprint":false},{"year":1996,"finding":"Elf-1 is constitutively localized in the nucleus, dependent on amino acids 86–265. The N-terminal 86 amino acids contain a transcriptional activation domain whose activity is attenuated by an internal repression domain. Elf-1 stimulates transcription via E74 target sequences independently of mitogenic signaling.","method":"Subcellular fractionation, deletion mutagenesis of Elf-1 fused to Gal4 DNA binding domain, reporter assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping by deletion mutants with functional reporter readout; single lab, multiple deletion constructs","pmids":["9180266"],"is_preprint":false},{"year":1996,"finding":"Elf-1 binds to a conserved Ets site (site III) in the mouse IL-2 receptor alpha IL-2-responsive enhancer (IL-2rE) and participates in IL-2 responsiveness; mutations in site III that reduce Elf-1 binding in vitro reduce IL-2rE activity in vivo, suggesting Elf-1 can act as a transcriptional repressor at the PRRIII element of the human IL-2Rα gene.","method":"EMSA with recombinant Elf-1, supershift with anti-Elf-1 antibody, biotinylated probe precipitation, in vivo footprinting, transient transfection reporter assays, mutagenesis","journal":"Molecular and cellular biology / The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (EMSA, supershift, in vivo footprinting, mutagenesis, reporter assays) across two independent labs","pmids":["8943338","9104808"],"is_preprint":false},{"year":1996,"finding":"Elf-1 is expressed in an increasing gradient in the septum and selectively allows neurite growth from topographically appropriate lateral hippocampal neurons while inhibiting medial hippocampal neurite outgrowth; Elf-1 specifically binds the Bsk Eph receptor and elicits its tyrosine kinase activity.","method":"In vitro neurite outgrowth assay, receptor binding assay, kinase activity assay","journal":"Proceedings of the National Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional in vitro assays with receptor binding and kinase activation; single lab","pmids":["8855326"],"is_preprint":false},{"year":1996,"finding":"ELF-1 (RAGS and ELF-1) acts as a repellent factor for temporal retinal axons in two in vitro assays; RAGS is repellent for both temporal and nasal axons while ELF-1 is repellent only for temporal axons, correlating with strength of receptor interaction.","method":"Stripe assay and growth cone collapse assay in vitro","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent in vitro functional assays; single lab but two orthogonal methods","pmids":["9135142"],"is_preprint":false},{"year":1997,"finding":"ELF-1 inhibits neurite outgrowth of Cek8-expressing motoneurons when presented in membrane-bound or clustered Fc chimeric form but not as unclustered soluble protein, and this inhibition correlates with receptor (Cek8) phosphorylation.","method":"Motoneuron neurite outgrowth assay, receptor phosphorylation assay, Fc-chimera clustering","journal":"Mechanisms of development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assay with mechanistic correlation to receptor phosphorylation; single lab","pmids":["9232603"],"is_preprint":false},{"year":1996,"finding":"Elf-1 binds to the Ets consensus site in the IL-3 promoter; both the AP-1 and Elf-1 binding sites are required for T cell-specific IL-3 promoter activity, but unlike in the IL-2 gene, Elf-1 and AP-1 factors bind independently in the IL-3 promoter.","method":"DNase I footprinting, EMSA, in vitro translation of Elf-1, supershift with Elf-1 antisera, transient transfection with mutagenized reporter constructs","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding and functional methods; single lab","pmids":["8228815"],"is_preprint":false},{"year":1998,"finding":"Elf-1 is the primary Ets factor binding to the Ets binding sites (zEBS1 and zEBS2) in the TCR zeta-chain promoter; mutagenesis of these sites markedly reduces transcription, and ectopic Elf-1 expression increases TCR zeta-chain promoter activity mapping to zEBS1 and zEBS2. A GAL4-Elf-1 fusion also trans-activates TCR zeta-chain promoter constructs containing GAL4 sites.","method":"EMSA, in vitro mutagenesis, ectopic expression in COS-7 cells, GAL4 fusion trans-activation assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — EMSA, mutagenesis, ectopic expression, and GAL4 fusion assays in one study; multiple orthogonal methods","pmids":["9510181"],"is_preprint":false},{"year":1998,"finding":"PU.1 and Elf-1 both bind to the SCL (tal-1) promoter 1b Ets motifs and transactivate the promoter in mast cells; transcription factors PU.1, Elf-1, Sp1, and Sp3 are present in mast cell extracts and bind promoter 1b.","method":"Gel shift assay, reporter transactivation, ChIP (not explicitly stated but implied by promoter binding), transient transfection","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and transactivation assays; single lab","pmids":["9786909"],"is_preprint":false},{"year":1999,"finding":"Elf-1 binds to the Ets site in the FcεRI alpha-chain promoter and is one of the factors (with GATA-1) essential for promoter activity; Elf-1 binding is required for alpha-chain-producing cell specificity.","method":"EMSA with nuclear extracts and in vitro-translated proteins, transient transfection reporter assays with mutagenized promoter","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus functional mutagenesis; single lab","pmids":["10395650"],"is_preprint":false},{"year":1999,"finding":"Elf-1 binds to the P4 Ets site in the CD4 promoter and specifically activates CD4 promoter activity; no other tested Ets family members bound this site in T cells.","method":"EMSA, transient transfection reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus functional reporter assay; single lab","pmids":["10347164"],"is_preprint":false},{"year":1999,"finding":"Elf-1 and PU.1 both bind to a promoter element mutated in chronic granulomatous disease (CGD) patients (-57 to -52 bp) and transactivate the gp91(phox) promoter; CGD-associated point mutations at -57 and -55 significantly reduce Elf-1 and PU.1 binding and transactivation, but no synergy occurs between Elf-1 and PU.1 on this promoter.","method":"EMSA, transient transfection reporter assays with CGD mutations, overexpression in HeLa and PLB985 cells","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and reporter assays with disease-relevant mutations; single lab","pmids":["10233904"],"is_preprint":false},{"year":1999,"finding":"Elf-1 does not cooperate with GATA3 to activate the human IL-5 promoter (unlike Ets1 and Ets2), demonstrating specificity among closely related Ets factors in this context.","method":"Transient transfection reporter assays in Jurkat T-cells and Kasumi myeloid cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — negative finding for Elf-1 confirmed by reporter assay; single lab, single method","pmids":["10212281"],"is_preprint":false},{"year":2001,"finding":"Elf-1 is a transcriptional regulator of the Tie2 gene in endothelial cells; chicken Elf-1 (cELF-1) is expressed in developing blood vessels, binds conserved Ets sites in Tie1 and Tie2 promoters, and strongly transactivates these genes. Elf-1-containing complexes in CAM blood vessel extracts are recognized by anti-cELF-1 antibody.","method":"In situ hybridization, immunohistochemistry, RT-PCR, EMSA with antibody supershift, transient transfection reporter assays","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA with supershift plus transactivation assays in vascular tissue; single lab","pmids":["11157678"],"is_preprint":false},{"year":2002,"finding":"Elf-1 exists as an 80-kDa form in the cytoplasm and as a 98-kDa form in the nucleus; phosphorylation and O-linked glycosylation contribute to the increased molecular mass. The 98-kDa nuclear form is released from cytoplasmic retinoblastoma protein tethering and moves to the nucleus to bind the TCR zeta-chain promoter; the cytoplasmic 98-kDa form undergoes proteasomal degradation.","method":"Subcellular fractionation, Western blot, phosphatase and glycosidase treatment, immunoprecipitation, DNA binding assay, proteasome inhibitor experiments","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical methods (fractionation, PTM identification, Rb co-IP, promoter binding) establishing localization-function link","pmids":["11884456"],"is_preprint":false},{"year":2002,"finding":"Defective production of the functional 98-kDa nuclear form of Elf-1 in SLE T cells results from abnormal posttranslational modifications; two distinct defects were identified: decreased 98-kDa levels OR normal apparent levels but abnormal isoelectric focusing pattern. This defect causes reduced TCR zeta-chain transcription.","method":"Subcellular fractionation, Western blot, isoelectric focusing, transcription/translation analysis, reporter assays","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical methods in primary SLE T cells; single lab","pmids":["12421992"],"is_preprint":false},{"year":2004,"finding":"Elf-1 binds to conserved Ets sites in the scl/tal-1 5' (-3.8) bifunctional enhancer in hematopoietic progenitors and endothelial cells in vivo, as demonstrated by ChIP; the -3.8 enhancer (but not the +18/19 enhancer) is required for scl transcription.","method":"ChIP, comparative genomics, transgenic mice, knockout approach","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ChIP plus transgenic/knockout validation; single lab","pmids":["14966269"],"is_preprint":false},{"year":2005,"finding":"Elf-1 was identified via DNA affinity chromatography as the Ets protein with highest affinity for the TdT promoter D' element; a D' mutation that selectively reduces Elf-1 binding greatly reduces TdT promoter activity in immature T and B cells.","method":"DNA affinity chromatography, peptide microsequencing, immunoblot, transient transfection reporter assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — affinity chromatography with microsequencing plus mutagenesis functional assay; single lab","pmids":["8887642"],"is_preprint":false},{"year":2005,"finding":"Elf-1, Fli-1, and Ets1 bind in vivo to conserved Ets sites in the LMO2 proximal promoter in hematopoietic and endothelial cells, and these sites are required for promoter activity; transgenic analysis confirmed the proximal promoter drives endothelial expression in vivo.","method":"ChIP, EMSA, transient/stable transfection reporter assays, transgenic mice","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ChIP plus multiple cell-line validations and transgenic confirmation; single lab","pmids":["15994290"],"is_preprint":false},{"year":2005,"finding":"A 34-amino-acid peptide corresponding to the terminal ETS domain of ELF-1 blocks ELF-1 function; a TAT-fused version enters endothelial cell nuclei, reduces Tie2 and eNOS expression, inhibits angiopoietin-1-mediated endothelial cell migration, and systemically attenuates B16 melanoma tumor growth and tumor angiogenesis in nude mice.","method":"Cell-penetrating peptide delivery, reporter assays, endothelial cell migration assay, mouse tumor xenograft model","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional domain-blocking peptide with in vitro and in vivo phenotypic readouts; single lab","pmids":["16352813"],"is_preprint":false},{"year":2005,"finding":"Elf1 (yeast) is a transcription elongation factor that associates co-transcriptionally with actively transcribed regions; synthetic lethality with mutations in Spt4, Spt5, Spt6, and Paf1 complex members identifies it as part of the elongation machinery. Association is partially dependent on Spt4 and Spt6. Elf1 is purified in association with casein kinase II.","method":"Genetic screen (synthetic lethality), ChIP genome-wide, protein purification/mass spectrometry","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis screen plus ChIP plus biochemical purification; multiple orthogonal methods in single study","pmids":["16260625"],"is_preprint":false},{"year":2006,"finding":"Fli-1, Erg, and Elf-1 bind in vivo to conserved Ets sites in both the endoglin promoter and a -8 kb enhancer in endothelial cells; both elements depend on these Ets sites for activity.","method":"ChIP, comparative genomics, transient transfection reporter assays, transgenic mice","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ChIP plus functional reporter assays and transgenic validation; single lab","pmids":["16484587"],"is_preprint":false},{"year":2006,"finding":"Elf-1 binds to two Ets binding sites in the LAT gene proximal promoter and overexpression of Elf-1 augments LAT promoter activity; a Runx-1 binding site adjacent to one Ets site has an inhibitory effect.","method":"EMSA, transient transfection reporter assays, Elf-1 overexpression","journal":"BMC molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus reporter transactivation; single lab","pmids":["16464244"],"is_preprint":false},{"year":2006,"finding":"Yeast Elf1 is phosphorylated by protein kinase CK2 at Ser95 and Ser117 in vitro; Elf1 co-immunoprecipitates with both catalytic (α, α') and regulatory (β, β') subunits of CK2.","method":"In vitro kinase assay, MALDI-MS phosphosite identification, co-immunoprecipitation","journal":"Journal of biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay with MS-identified sites plus co-IP; single lab","pmids":["16756761"],"is_preprint":false},{"year":2007,"finding":"Elf-1 specifically binds to GGAA elements in the FcRγ promoter and represses FcRγ expression; forced Elf-1 expression suppresses FcRγ, while siRNA knockdown of Elf-1 increases FcRγ expression.","method":"EMSA, overexpression and siRNA knockdown, reporter assays","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA with gain- and loss-of-function showing bidirectional transcriptional regulation; single lab","pmids":["17878388"],"is_preprint":false},{"year":2008,"finding":"PP2A dephosphorylates Elf-1 at Thr-231, resulting in limited nuclear 98-kDa Elf-1 form and decreased binding to CD3ζ and FcRγ promoters. Aberrantly increased PP2A in lupus T cells causes this dephosphorylation. Suppression of PP2A expression increases CD3ζ and decreases FcRγ expression, correcting early signaling defects.","method":"Phosphatase activity assays, phosphosite-specific analysis, ChIP, siRNA knockdown of PP2A, Western blot","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — identified writer/eraser (PP2A), specific phosphosite (Thr-231), functional consequence on promoter binding and gene expression, confirmed by loss-of-function; multiple orthogonal methods","pmids":["18714041"],"is_preprint":false},{"year":2008,"finding":"Elf-1 negatively regulates FcεRI alpha-chain expression in primary mast cells (BMMC) by suppressing PU.1-mediated transcription; Elf-1 siRNA knockdown increases alpha-chain transcription and increases PU.1 occupancy at the promoter (by ChIP), while Elf-1 overexpression suppresses alpha-chain promoter activity.","method":"siRNA knockdown, overexpression, transient reporter assay, ChIP","journal":"Immunogenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA plus overexpression plus ChIP in primary cells; single lab","pmids":["18629488"],"is_preprint":false},{"year":2009,"finding":"O-GlcNAc modification inhibits a physical interaction between Sp1 and Elf-1 transcription factors, negatively regulating transcription of the Pem gene.","method":"Co-immunoprecipitation, O-GlcNAc modification analysis, reporter assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP demonstrating interaction modulated by PTM, with reporter readout; single lab","pmids":["19285002"],"is_preprint":false},{"year":2010,"finding":"Elf-1-deficient mice exhibit a partial, cell-intrinsic block in NKT cell development affecting selection, survival, and maturation, with residual NKT cells producing less cytokine upon antigen stimulation; NK cell proportions are normal, demonstrating selective requirement for Elf-1 in NKT but not NK cell development.","method":"Knockout mouse model (Elf-1⁻/⁻), flow cytometry, bone marrow chimera (cell-intrinsic defect), cytokine stimulation assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with specific cellular phenotype, cell-autonomous effect confirmed by chimera experiments; multiple readouts","pmids":["21148815"],"is_preprint":false},{"year":2010,"finding":"PU.1 is a major upstream transcriptional regulator of Elf-1 (identified by ChIP-chip); Elf-1 downregulation is necessary for terminal erythroid differentiation (overexpression of Elf-1 inhibits erythroid maturation).","method":"ChIP-chip (locus-wide), comparative genomics, overexpression in primary murine fetal liver erythroid differentiation assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-chip identifies upstream regulator, functional overexpression confirms role in differentiation; single lab","pmids":["20525788"],"is_preprint":false},{"year":2010,"finding":"ELF1 binds to a conserved ETS site in the MEIS1 promoter and is enriched there by ChIP; siRNA-mediated knockdown of ELF1 decreases MEIS1 expression in K562 cells and primary human samples, identifying ELF1 as a positive transcriptional regulator of MEIS1.","method":"EMSA, ChIP, siRNA knockdown with mRNA quantification","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus in vivo ChIP plus functional knockdown; single lab","pmids":["20600580"],"is_preprint":false},{"year":2011,"finding":"O-GlcNAc modification of Elf-1 promotes its nuclear localization; in intestinal epithelial cells (IECs), O-GlcNAc modification of Elf-1 is significantly lower than in monocytes, preventing nuclear translocation of Elf-1 and thereby relieving Elf-1-mediated repression of the Tollip gene, which explains elevated Tollip expression in IECs.","method":"Subcellular fractionation, Western blot for O-GlcNAc modification, comparison of Caco-2 (IEC) vs. THP-1 (monocyte) cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical fractionation plus PTM analysis linked to functional gene expression outcome; single lab","pmids":["21867680"],"is_preprint":false},{"year":2018,"finding":"ELF1 has two distinct tumor-suppressive roles in prostate cancer: (1) inhibiting cell migration and EMT by interfering with oncogenic ETS factors at ETS/AP-1 cis-regulatory sequences, and (2) activating genes promoting senescence at unique ELF1-targeted sites. ELF1 knockdown increases docetaxel resistance.","method":"Genome-wide chromatin mapping (ChIP-seq), cell migration assay, EMT marker analysis, senescence assay, siRNA knockdown, drug resistance assay","journal":"Genes & cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide binding mapping plus multiple functional assays; single lab","pmids":["30603056"],"is_preprint":false},{"year":2019,"finding":"ELF1 inhibits replication of eight diverse RNA and DNA viruses (independent of type I interferons) in a broadly antiviral transcriptional program distinct from interferon signatures; Elf1-deficient mice show enhanced susceptibility to influenza A virus. ELF1's antiviral effect is independent of STAT1 and JAK phosphorylation.","method":"Microscopy-based viral infection quantification, Elf1-knockout mouse infection, RNA-seq comparative expression analysis, JAK inhibitor and STAT1-KO experiments","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse in vivo validation plus multiple virus species plus mechanistic dissection from IFN pathway; multiple orthogonal methods","pmids":["31682641"],"is_preprint":false},{"year":2021,"finding":"In yeast, elongation factor Elf1 inhibits RNA Pol II transcriptional bypass of CTG and CAG trinucleotide repeat slip-out structures (individually and cooperatively with Spt4/5), while Spt4/5 promotes Pol II transcription through B-form CTG•CAG duplex DNA—opposite roles depending on DNA template structure.","method":"In vitro reconstituted yeast transcription system with defined DNA templates","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical reconstitution in vitro with purified components and defined substrates; mechanistically definitive","pmids":["33877330"],"is_preprint":false},{"year":2024,"finding":"Yeast Elf1 promotes TC-NER by enhancing Rad26 (CSB ortholog) interactions with lesion-arrested RNA Pol II; cryo-EM structures of Pol II-Rad26 stalled at different obstacles show Rad26 uses a common mechanism to recognize stalled Pol II with additional interactions at lesion-arrested Pol II, and Elf1 further stabilizes Rad26–Pol II interactions specifically at lesions. Biochemical and genetic data support the Elf1–Rad26 interplay in TC-NER initiation.","method":"Cryo-EM structural determination, biochemical assays, genetic epistasis in yeast","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structures plus biochemical assays plus genetic validation; multiple orthogonal methods in single study","pmids":["38194460"],"is_preprint":false},{"year":2024,"finding":"The C-terminal domain (CTD) of yeast Elf1 is required for efficient TC-NER genome-wide; the Elf1 CTD binds the pleckstrin homology (PH) domain of the p62 subunit of TFIIH in vitro, and a conserved TFIIH-interaction region (TIR) in the CTD is necessary for this binding and for TC-NER—functionally analogous to the TIR in mammalian UVSSA that recruits TFIIH.","method":"CPD-seq (genome-wide repair mapping), in vitro binding assay, CTD deletion/mutation analysis, structural/sequence comparison","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide repair mapping plus in vitro binding with domain mutagenesis; multiple orthogonal methods; functional analogy validated structurally","pmids":["39043658"],"is_preprint":false},{"year":2025,"finding":"In zebrafish, Elf1 is a cell-autonomous regulator of macrophage development with minimal effect on neutrophil differentiation; CRISPR/Cas9 knockout and dominant-negative overexpression demonstrate Elf1 is required for macrophage infiltration to tissue injury. Overexpression of cxcr4b (a downstream Elf1 target essential for cell migration) rescues the macrophage defect, placing cxcr4b downstream of Elf1.","method":"Morpholino knockdown, CRISPR/Cas9 knockout, dominant-negative overexpression in macrophages, rescue with cxcr4b overexpression, tissue injury model","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO and rescue experiments establishing pathway position; single lab in zebrafish model","pmids":["40141178"],"is_preprint":false},{"year":2025,"finding":"ELF1 binds to promoters of METTL3 and YTHDF2 and transactivates their expression; elevated ELF1 in nucleus pulposus cells promotes m6A methylation of E2F3 mRNA via METTL3, which is then recognized and destabilized by YTHDF2, causing E2F3 mRNA degradation, G1/S cell cycle arrest, and NPC senescence.","method":"ChIP-seq, ChIP, proteomic/RNA-seq, MeRIP-qPCR, RNA pull-down, luciferase reporter assay, AAV5 overexpression and KO mice, small molecule targeting","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus multiple binding assays plus in vivo KO/OE; single lab, complex multi-step pathway","pmids":["40467575"],"is_preprint":false},{"year":2025,"finding":"ELF-1 deficiency in non-hematopoietic (epithelial) cells intrinsically worsens DSS-induced colitis in mice; ELF-1 directly regulates Rack1 gene expression in colonic epithelial tissue and its absence enhances pro-inflammatory chemokine production, leading to neutrophil and immune cell infiltration.","method":"Conditional/global ELF-1 KO mouse, bone marrow transfer experiments (confirming non-hematopoietic cell-intrinsic defect), DSS colitis model, ChIP, chemokine quantification","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bone marrow chimera confirms cell-autonomous non-hematopoietic role, ChIP identifies direct target Rack1; single lab","pmids":["40057592"],"is_preprint":false}],"current_model":"ELF1 (E74-like factor 1) is a lymphoid-enriched ETS-family transcription factor that binds GGAA-core Ets sites to regulate a broad set of hematopoietic, endothelial, and immune-cell genes (including IL-2, GM-CSF, TCRζ, FcRγ, CD4, LAT, Tie2, LMO2, and SCL); its transcriptional activity is controlled by posttranslational modifications—phosphorylation (including by the PP2A phosphatase at Thr-231) and O-GlcNAcylation—that govern its nuclear import and DNA-binding capacity and its regulated release from retinoblastoma protein; as a GPI-anchored ligand it also activates Eph-family receptor tyrosine kinases to mediate repellent axon guidance and topographic neural map formation; and, through its yeast/mammalian ortholog ELOF1/Elf1, it functions as a transcription elongation factor that recruits TFIIH via its C-terminal domain to initiate transcription-coupled nucleotide excision repair at RNA Pol II lesion-arrest sites."},"narrative":{"mechanistic_narrative":"ELF1 (Elf-1) is a lymphoid-enriched ETS-family transcription factor that recognizes GGAA-core Ets binding sites to control a broad program of hematopoietic, immune, and endothelial genes [PMID:1545787, PMID:8255775]. Selective recognition of the GGAA core is conferred by a single residue in conserved region III of its Ets domain, distinguishing it from Ets1/Ets2 [PMID:1545787, PMID:8255775]. Through this activity it directly regulates immune and signaling genes including IL-2, GM-CSF, the TCR ζ-chain, CD4, LAT, TdT, and Fc receptor genes [PMID:1545787, PMID:8289796, PMID:9510181, PMID:10347164, PMID:16464244, PMID:8887642], frequently acting combinatorially with other factors—cooperatively with AP-1 (c-Fos/JunB) at the GM-CSF PB1 element and with PU.1 at hematopoietic promoters such as SCL/tal-1 and gp91phox [PMID:8289796, PMID:9786909, PMID:10233904]. ELF1 can function as either an activator or a repressor depending on context, suppressing FcRγ and antagonizing PU.1-driven FcεRI α-chain transcription [PMID:17878388, PMID:18629488]. In the vascular system it transactivates endothelial genes including Tie1/Tie2, LMO2, and endoglin, and is required for angiopoietin-1-driven endothelial migration and tumor angiogenesis [PMID:11157678, PMID:15994290, PMID:16484587, PMID:16352813]. Its activity is governed by posttranslational control of localization: ELF1 is tethered in the cytoplasm by the underphosphorylated retinoblastoma protein and released upon Rb phosphorylation after T-cell activation [PMID:8493578], and a nuclear 98-kDa form generated through phosphorylation and O-GlcNAcylation is required for promoter binding [PMID:11884456]. PP2A dephosphorylation at Thr-231 limits the nuclear form and reduces binding to CD3ζ and FcRγ promoters, a defect amplified in lupus T cells, while O-GlcNAcylation controls nuclear translocation and modulates interaction with Sp1 [PMID:18714041, PMID:19285002, PMID:21867680]. Genetic loss-of-function defines physiological roles in NKT-cell development, macrophage development via cxcr4b, intestinal epithelial homeostasis via Rack1, and a broadly antiviral transcriptional program independent of type I interferon [PMID:21148815, PMID:40141178, PMID:40057592, PMID:31682641]. The yeast ortholog Elf1 acts as a transcription elongation factor associated with the Spt4/Spt5/Spt6/Paf1 machinery and promotes transcription-coupled nucleotide excision repair by stabilizing Rad26 at lesion-arrested RNA Pol II and recruiting TFIIH through a C-terminal TFIIH-interaction region [PMID:16260625, PMID:38194460, PMID:39043658].","teleology":[{"year":1992,"claim":"Established ELF1 as a distinct Ets-family transcription factor with its own DNA-binding specificity, answering whether a new factor governed inducible immune-gene enhancers.","evidence":"EMSA, methylation interference, and in vitro mutagenesis of the IL-2 and HIV-2 enhancers in T cells","pmids":["1545787","1527846"],"confidence":"High","gaps":["Cellular signals controlling inducible binding not yet defined","No domain map of activation versus DNA-binding regions"]},{"year":1993,"claim":"Defined the molecular basis of ELF1's GGAA-core site selectivity and its combinatorial action with AP-1, explaining how it is targeted distinctly from Ets1/Ets2.","evidence":"Reciprocal Ets-domain mutagenesis plus cooperative supershift EMSA and reporter assays at GM-CSF and viral enhancers","pmids":["8255775","8289796","8350410"],"confidence":"High","gaps":["Structural detail of the Ets-domain/DNA interface not resolved","Genome-wide site repertoire unknown at this stage"]},{"year":1993,"claim":"Identified Rb-mediated cytoplasmic tethering and activation-dependent release as the first layer of post-translational control over ELF1 activity.","evidence":"Reciprocal co-IP, in vitro binding, and dominant-negative phosphorylation-defective Rb in T cells","pmids":["8493578"],"confidence":"High","gaps":["Kinase responsible for Rb phosphorylation in this context not identified","Mechanism linking release to nuclear import unresolved"]},{"year":1994,"claim":"Revealed an unexpected, second identity: a GPI-anchored Eph-receptor ligand, raising the question of whether the timeline conflates two molecularly distinct entities sharing the ELF-1 name.","evidence":"Receptor-alkaline phosphatase fusion expression-library screen identifying ELF-1 as a Mek4/Sek ligand","pmids":["7522971"],"confidence":"High","gaps":["Relationship between the GPI-anchored ligand and the nuclear ETS factor not reconciled in the corpus","Whether these are the same gene product is not established"]},{"year":1995,"claim":"Showed the ELF-1 Eph ligand forms a graded guidance cue, addressing how complementary receptor/ligand gradients pattern the retinotectal map.","evidence":"RNA in situ hybridization and receptor-AP fusion binding across tectum and retina","pmids":["7634327","7876076"],"confidence":"High","gaps":["Downstream signaling of activated Eph receptor only partially defined","Substrate identity (62 kDa) unknown"]},{"year":1996,"claim":"Demonstrated repellent, topographically specific axon guidance by the ELF-1 ligand and constrained the cells responsive to it.","evidence":"In vitro stripe/collapse assays and retroviral in vivo overexpression with axon mapping","pmids":["8797822","9135142","8855326","9232603"],"confidence":"High","gaps":["Receptor-clustering requirement only partially mechanistic","In vivo loss-of-function for guidance not shown"]},{"year":1996,"claim":"Mapped ELF1's transcriptional architecture—constitutive nuclear localization, an N-terminal activation domain, and an internal repression domain—answering how it both activates and restrains transcription.","evidence":"Subcellular fractionation and Gal4-fusion deletion mutagenesis with reporter assays","pmids":["9180266"],"confidence":"Medium","gaps":["Coactivators/corepressors recruited by these domains not identified","Conflicts with later cytoplasmic-tethering data not reconciled here"]},{"year":1996,"claim":"Extended ELF1's regulatory reach across immune-gene promoters and revealed it can act as a repressor as well as an activator.","evidence":"EMSA, supershift, in vivo footprinting, and mutagenesis at IL-2Rα, IL-3, and TdT promoters","pmids":["8943338","9104808","8228815","8887642"],"confidence":"High","gaps":["Determinants of activator-versus-repressor outcome not defined","Cofactor partners at repressive sites unknown"]},{"year":1999,"claim":"Defined ELF1 as a direct regulator of additional immune/hematopoietic genes and its functional specificity relative to other Ets factors.","evidence":"EMSA and reporter assays at CD4, FcεRI α-chain, gp91phox, IL-5, and SCL promoters","pmids":["10347164","10395650","10233904","10212281","9786909"],"confidence":"Medium","gaps":["Why ELF1 fails to cooperate with GATA3 (unlike Ets1/2) mechanistically unexplained","In vivo occupancy not established for most targets"]},{"year":2002,"claim":"Connected molecular-mass forms of ELF1 to localization and function, establishing that a phosphorylated/O-GlcNAcylated 98-kDa nuclear form is the active species and its loss underlies SLE T-cell defects.","evidence":"Fractionation, PTM enzymatic stripping, IEF, Rb co-IP, and promoter binding in normal and SLE T cells","pmids":["11884456","12421992"],"confidence":"High","gaps":["Enzymes generating the 98-kDa form not yet identified","Precise PTM sites mapped only later"]},{"year":2001,"claim":"Established ELF1 as a transcriptional driver of the endothelial/hematopoietic program and a target for anti-angiogenic intervention.","evidence":"In situ, EMSA/supershift, ChIP, transgenics, and a dominant-negative ETS-domain peptide in tumor xenografts (Tie1/Tie2, LMO2, endoglin, eNOS)","pmids":["11157678","15994290","16484587","16352813","14966269"],"confidence":"Medium","gaps":["Redundancy with Fli-1/Erg/Ets1 at shared sites not resolved","Direct endothelial loss-of-function phenotype not shown"]},{"year":2005,"claim":"Identified the yeast ortholog Elf1 as a transcription elongation factor physically and genetically linked to the elongation machinery and to CK2.","evidence":"Synthetic-lethality screen, genome-wide ChIP, and protein purification/MS; in vitro CK2 phosphorylation at Ser95/Ser117","pmids":["16260625","16756761"],"confidence":"High","gaps":["Functional consequence of CK2 phosphorylation not established","Connection between elongation role and mammalian ETS function unclear"]},{"year":2008,"claim":"Pinpointed PP2A-mediated dephosphorylation at Thr-231 as the eraser controlling the nuclear ELF1 pool and its target binding, mechanistically linking PTM to lupus T-cell gene dysregulation.","evidence":"Phosphatase and phosphosite-specific assays, ChIP, and PP2A siRNA in T cells","pmids":["18714041"],"confidence":"High","gaps":["Kinase opposing PP2A at Thr-231 not identified","How dephosphorylation prevents nuclear accumulation mechanistically unresolved"]},{"year":2009,"claim":"Defined O-GlcNAcylation as a switch controlling ELF1 nuclear translocation and its Sp1 interaction, extending PTM control of localization-dependent function.","evidence":"Co-IP, O-GlcNAc analysis, fractionation, and reporter assays (Pem and Tollip genes; Caco-2 vs THP-1)","pmids":["19285002","21867680"],"confidence":"Medium","gaps":["O-GlcNAc sites on ELF1 not mapped","Cell-type determinants of differential glycosylation unknown"]},{"year":2010,"claim":"Placed ELF1 within hematopoietic differentiation circuits as both a PU.1 target and a regulator of MEIS1 and erythroid maturation, and defined its requirement in NKT-cell development.","evidence":"ChIP-chip, EMSA/ChIP, overexpression/knockdown in erythroid and K562 cells, and Elf-1−/− mice with chimeras","pmids":["20525788","20600580","21148815"],"confidence":"High","gaps":["Direct ELF1 target genes in NKT cells not defined","Mechanism of erythroid block downstream of ELF1 unresolved"]},{"year":2019,"claim":"Uncovered a broad, interferon-independent antiviral transcriptional program directed by ELF1, defining a novel innate-immune effector role.","evidence":"Multi-virus infection quantification, RNA-seq, Elf1-KO mouse influenza challenge, and JAK/STAT1 inhibition","pmids":["31682641"],"confidence":"High","gaps":["Direct antiviral target genes not enumerated","Mechanism of IFN-independent induction of the program unknown"]},{"year":2024,"claim":"Resolved the structural and biochemical mechanism by which the yeast ortholog initiates transcription-coupled NER—stabilizing Rad26 at lesion-stalled Pol II and recruiting TFIIH via its C-terminal TFIIH-interaction region.","evidence":"Cryo-EM of Pol II–Rad26 complexes, in vitro reconstitution, CPD-seq, and CTD-domain binding/mutagenesis to TFIIH p62 PH domain","pmids":["38194460","39043658","33877330"],"confidence":"High","gaps":["Whether mammalian ELF1 retains an equivalent TC-NER function not tested","Relationship between elongation role and lesion-bypass control not fully integrated"]},{"year":2025,"claim":"Extended ELF1's in vivo physiological roles to macrophage development, intestinal epithelial homeostasis, and m6A-coupled cell-cycle control, defining direct downstream effectors.","evidence":"Zebrafish CRISPR/dominant-negative with cxcr4b rescue; conditional KO mouse colitis with Rack1 ChIP; ChIP-seq of METTL3/YTHDF2 with E2F3 m6A in nucleus pulposus cells","pmids":["40141178","40057592","40467575"],"confidence":"Medium","gaps":["Direct versus indirect nature of some target relationships not fully separated","Conservation of these roles to human tissues not established"]},{"year":null,"claim":"Whether the nuclear ETS transcription factor and the GPI-anchored Eph ligand reported under the ELF-1 name are the same gene product, and how the elongation/TC-NER ortholog function relates to mammalian ETS activity, remains unresolved in this corpus.","evidence":"","pmids":[],"confidence":"Low","gaps":["No experiment in the corpus reconciles the transcription-factor and Eph-ligand identities","Mammalian counterpart of the yeast elongation/TC-NER role not directly tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3,17,23,34,42]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,3,27,40]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[6,8,9,13]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[11,24,41]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[24,41]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,17,23,30]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[38,43,49]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[45,46]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[8,10,47]}],"complexes":[],"partners":["RB1","PU.1","SP1","EPHA3","JUNB","FOS","RAD26","TFIIH"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P32519","full_name":"ETS-related transcription factor Elf-1","aliases":["E74-like factor 1"],"length_aa":619,"mass_kda":67.5,"function":"Transcription factor that activates the LYN and BLK promoters. Appears to be required for the T-cell-receptor-mediated trans activation of HIV-2 gene expression. Binds specifically to two purine-rich motifs in the HIV-2 enhancer","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P32519/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ELF1","classification":"Not Classified","n_dependent_lines":14,"n_total_lines":1208,"dependency_fraction":0.011589403973509934},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ELF1","total_profiled":1310},"omim":[{"mim_id":"619818","title":"ELONGATION FACTOR 1; ELOF1","url":"https://www.omim.org/entry/619818"},{"mim_id":"619798","title":"E74-LIKE ETS TRANSCRIPTION FACTOR 2; ELF2","url":"https://www.omim.org/entry/619798"},{"mim_id":"605474","title":"TOLL-LIKE RECEPTOR 9; TLR9","url":"https://www.omim.org/entry/605474"},{"mim_id":"601535","title":"EPHRIN A5; EFNA5","url":"https://www.omim.org/entry/601535"},{"mim_id":"600609","title":"GA-BINDING PROTEIN TRANSCRIPTION FACTOR, ALPHA SUBUNIT; GABPA","url":"https://www.omim.org/entry/600609"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":189.8}],"url":"https://www.proteinatlas.org/search/ELF1"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P32519","domains":[{"cath_id":"1.10.10.10","chopping":"209-288","consensus_level":"high","plddt":93.9821,"start":209,"end":288}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P32519","model_url":"https://alphafold.ebi.ac.uk/files/AF-P32519-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P32519-F1-predicted_aligned_error_v6.png","plddt_mean":52.78},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ELF1","jax_strain_url":"https://www.jax.org/strain/search?query=ELF1"},"sequence":{"accession":"P32519","fasta_url":"https://rest.uniprot.org/uniprotkb/P32519.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P32519/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P32519"}},"corpus_meta":[{"pmid":"7634327","id":"PMC_7634327","title":"Complementary gradients in expression and binding of ELF-1 and Mek4 in development of the topographic retinotectal projection map.","date":"1995","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/7634327","citation_count":674,"is_preprint":false},{"pmid":"8797822","id":"PMC_8797822","title":"Topographically specific effects of ELF-1 on retinal axon guidance in vitro and retinal axon mapping in vivo.","date":"1996","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/8797822","citation_count":366,"is_preprint":false},{"pmid":"7522971","id":"PMC_7522971","title":"Identification and cloning of ELF-1, a developmentally expressed ligand for the Mek4 and Sek receptor tyrosine kinases.","date":"1994","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/7522971","citation_count":326,"is_preprint":false},{"pmid":"1545787","id":"PMC_1545787","title":"cis-acting sequences required for inducible interleukin-2 enhancer function bind a novel Ets-related protein, Elf-1.","date":"1992","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/1545787","citation_count":255,"is_preprint":false},{"pmid":"9135142","id":"PMC_9135142","title":"Shared and distinct functions of RAGS and ELF-1 in guiding retinal axons.","date":"1997","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/9135142","citation_count":218,"is_preprint":false},{"pmid":"8493578","id":"PMC_8493578","title":"Regulation of the Ets-related transcription factor Elf-1 by binding to the retinoblastoma protein.","date":"1993","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/8493578","citation_count":212,"is_preprint":false},{"pmid":"1909284","id":"PMC_1909284","title":"Developmental function of Elf-1: an essential transcription factor during embryogenesis in Drosophila.","date":"1991","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/1909284","citation_count":171,"is_preprint":false},{"pmid":"8289796","id":"PMC_8289796","title":"Activation of the granulocyte-macrophage colony-stimulating factor promoter in T cells requires cooperative binding of Elf-1 and AP-1 transcription factors.","date":"1994","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/8289796","citation_count":140,"is_preprint":false},{"pmid":"8855326","id":"PMC_8855326","title":"Regulation of topographic projection in the brain: Elf-1 in the hippocamposeptal system.","date":"1996","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/8855326","citation_count":132,"is_preprint":false},{"pmid":"8896456","id":"PMC_8896456","title":"An IL-2 response element in the human IL-2 receptor alpha chain promoter is a composite element that binds Stat5, Elf-1, HMG-I(Y) and a GATA family protein.","date":"1996","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/8896456","citation_count":128,"is_preprint":false},{"pmid":"1527846","id":"PMC_1527846","title":"A novel Ets-related transcription factor, Elf-1, binds to human immunodeficiency virus type 2 regulatory elements that are required for inducible trans activation in T cells.","date":"1992","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/1527846","citation_count":109,"is_preprint":false},{"pmid":"8943338","id":"PMC_8943338","title":"Elf-1 and Stat5 bind to a critical element in a new enhancer of the human interleukin-2 receptor alpha gene.","date":"1996","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/8943338","citation_count":90,"is_preprint":false},{"pmid":"10212281","id":"PMC_10212281","title":"Regulation of the human interleukin-5 promoter by Ets transcription factors. Ets1 and Ets2, but not Elf-1, cooperate with GATA3 and HTLV-I Tax1.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10212281","citation_count":90,"is_preprint":false},{"pmid":"7935370","id":"PMC_7935370","title":"Elf-1 binds to a critical element in a second CD4 enhancer.","date":"1994","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/7935370","citation_count":89,"is_preprint":false},{"pmid":"8228815","id":"PMC_8228815","title":"Molecular regulation of the human IL-3 gene: inducible T cell-restricted expression requires intact AP-1 and Elf-1 nuclear protein binding sites.","date":"1993","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/8228815","citation_count":77,"is_preprint":false},{"pmid":"8756667","id":"PMC_8756667","title":"Characterization of NERF, a novel transcription factor related to the Ets factor ELF-1.","date":"1996","source":"Molecular and cellular 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(EMSA), methylation interference analysis, in vitro mutagenesis, low-stringency cDNA library screen\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding assays plus mutagenesis confirming functional requirement; foundational cloning paper with multiple orthogonal methods\",\n      \"pmids\": [\"1545787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Elf-1 binds specifically to two purine-rich motifs in the HIV-2 enhancer, and mutagenesis of these Elf-1 binding sites abolishes inducible HIV-2 transcription following T-cell-receptor-mediated T-cell activation.\",\n      \"method\": \"EMSA, site-directed mutagenesis, transient transfection reporter assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis demonstrates functional requirement; multiple orthogonal methods in a focused study\",\n      \"pmids\": [\"1527846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Elf-1 binds to the underphosphorylated (but not phosphorylated) form of the retinoblastoma protein (Rb) via a sequence motif homologous to viral oncoprotein Rb-binding sites, interacting with Rb's pocket region both in vitro and in vivo. After T cell activation, Rb phosphorylation releases Elf-1, correlating temporally with activation of Elf-1-mediated transcription. Overexpression of a phosphorylation-defective Rb inhibited Elf-1-dependent transcription.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, overexpression of phosphorylation-defective Rb mutant, transcriptional reporter assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, in vitro binding, functional reporter assay with dominant-negative mutant; multiple orthogonal methods\",\n      \"pmids\": [\"8493578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"A single amino acid substitution (Lys→Thr) in conserved region III (CRIII) of the Ets domain of Ets1 confers selective binding to GGAA core-containing sites (the specificity of Elf1/E74); the reciprocal mutation in Elf1 confers ability to bind GGAT core-containing EBS. CRIII plays a key role in Ets domain recognition of the GGAA/T core motif.\",\n      \"method\": \"Site-directed mutagenesis of Ets domain, DNA binding assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reciprocal mutagenesis in both proteins with functional binding readout; mechanistically definitive\",\n      \"pmids\": [\"8255775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Elf-1 binds to adjacent AP-1 and Ets sites in the GM-CSF purine box 1 (PB1) element cooperatively with c-Fos and JunB; mutagenesis of either the Ets or AP-1 site abolishes binding of the inducible PB1 complex and transcriptional activation of the GM-CSF promoter in activated T cells.\",\n      \"method\": \"EMSA with specific antibodies, in vitro mutagenesis, transient transfection reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — supershift EMSA identifies specific factors, mutagenesis confirms functional requirement, reporter assays validate transcriptional output\",\n      \"pmids\": [\"8289796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Elf-1 binds to the purine-rich ets site in the HTLV-I enhancer (not Ets-1 as previously thought), and site-specific mutation of this site significantly diminishes inducible HTLV-I enhancer function in Jurkat T cells.\",\n      \"method\": \"EMSA, site-directed mutagenesis, transient transfection reporter assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus mutagenesis in single study; single lab\",\n      \"pmids\": [\"8350410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"ELF-1 was identified as a ligand for the Eph family receptor tyrosine kinases Mek4 and Sek; ELF-1 is membrane-bound via a phosphatidylinositol (GPI) tail, as demonstrated by its expression in cell lines and embryos.\",\n      \"method\": \"cDNA expression library screen with receptor-alkaline phosphatase fusion proteins (RAP in situ), sequence analysis, cell line expression studies\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct ligand-receptor identification using receptor fusion protein screen with in situ validation; foundational cloning paper\",\n      \"pmids\": [\"7522971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Elf-1 binds to the Ets consensus site in a second CD4 enhancer 24 kb upstream of the CD4 promoter; mutation of this Ets site abolishes enhancer activity in T cells.\",\n      \"method\": \"EMSA, in vitro mutagenesis, transient transfection reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA identifies Elf-1 as dominant binding factor, mutagenesis confirms functional requirement; single lab\",\n      \"pmids\": [\"7935370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"ELF-1 is expressed in a high-to-low gradient in the tectum while its receptor Mek4 is expressed in a complementary gradient in the retina; binding activity detected with alkaline phosphatase fusions of ELF-1 and Mek4 shows molecular complementarity of gradients in reciprocal fields, indicating roles in retinotectal map development.\",\n      \"method\": \"RNA in situ hybridization, receptor-alkaline phosphatase fusion binding assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding detected with fusion proteins plus expression gradient mapping; replicated concept across multiple labs\",\n      \"pmids\": [\"7634327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Elf-1 (ELF-1) activates autophosphorylation of the Cek7 receptor tyrosine kinase; high-affinity binding (Kd ~1.7 × 10⁻¹⁰ M) was demonstrated between Elf-1 and the MDK1 (Eph family) receptor, and Elf-1 binding leads to autophosphorylation of MDK1 and tyrosine phosphorylation of a 62 kDa substrate.\",\n      \"method\": \"Scatchard binding analysis, receptor autophosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative binding and functional kinase activation assay; single lab\",\n      \"pmids\": [\"7876076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"ELF-1 acts as a repellent axon guidance factor in vitro for temporal but not nasal retinal axons; retroviral overexpression of ELF-1 in the tectum in vivo causes retinal axons to avoid ectopic ELF-1 patches and map abnormally, demonstrating topographically specific axon guidance.\",\n      \"method\": \"In vitro axon guidance assay, retroviral overexpression in vivo, retinal axon mapping\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro functional assay and in vivo gain-of-function with defined phenotypic readout; multiple orthogonal approaches\",\n      \"pmids\": [\"8797822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Elf-1 is constitutively localized in the nucleus, dependent on amino acids 86–265. The N-terminal 86 amino acids contain a transcriptional activation domain whose activity is attenuated by an internal repression domain. Elf-1 stimulates transcription via E74 target sequences independently of mitogenic signaling.\",\n      \"method\": \"Subcellular fractionation, deletion mutagenesis of Elf-1 fused to Gal4 DNA binding domain, reporter assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping by deletion mutants with functional reporter readout; single lab, multiple deletion constructs\",\n      \"pmids\": [\"9180266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Elf-1 binds to a conserved Ets site (site III) in the mouse IL-2 receptor alpha IL-2-responsive enhancer (IL-2rE) and participates in IL-2 responsiveness; mutations in site III that reduce Elf-1 binding in vitro reduce IL-2rE activity in vivo, suggesting Elf-1 can act as a transcriptional repressor at the PRRIII element of the human IL-2Rα gene.\",\n      \"method\": \"EMSA with recombinant Elf-1, supershift with anti-Elf-1 antibody, biotinylated probe precipitation, in vivo footprinting, transient transfection reporter assays, mutagenesis\",\n      \"journal\": \"Molecular and cellular biology / The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (EMSA, supershift, in vivo footprinting, mutagenesis, reporter assays) across two independent labs\",\n      \"pmids\": [\"8943338\", \"9104808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Elf-1 is expressed in an increasing gradient in the septum and selectively allows neurite growth from topographically appropriate lateral hippocampal neurons while inhibiting medial hippocampal neurite outgrowth; Elf-1 specifically binds the Bsk Eph receptor and elicits its tyrosine kinase activity.\",\n      \"method\": \"In vitro neurite outgrowth assay, receptor binding assay, kinase activity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional in vitro assays with receptor binding and kinase activation; single lab\",\n      \"pmids\": [\"8855326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"ELF-1 (RAGS and ELF-1) acts as a repellent factor for temporal retinal axons in two in vitro assays; RAGS is repellent for both temporal and nasal axons while ELF-1 is repellent only for temporal axons, correlating with strength of receptor interaction.\",\n      \"method\": \"Stripe assay and growth cone collapse assay in vitro\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent in vitro functional assays; single lab but two orthogonal methods\",\n      \"pmids\": [\"9135142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"ELF-1 inhibits neurite outgrowth of Cek8-expressing motoneurons when presented in membrane-bound or clustered Fc chimeric form but not as unclustered soluble protein, and this inhibition correlates with receptor (Cek8) phosphorylation.\",\n      \"method\": \"Motoneuron neurite outgrowth assay, receptor phosphorylation assay, Fc-chimera clustering\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assay with mechanistic correlation to receptor phosphorylation; single lab\",\n      \"pmids\": [\"9232603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Elf-1 binds to the Ets consensus site in the IL-3 promoter; both the AP-1 and Elf-1 binding sites are required for T cell-specific IL-3 promoter activity, but unlike in the IL-2 gene, Elf-1 and AP-1 factors bind independently in the IL-3 promoter.\",\n      \"method\": \"DNase I footprinting, EMSA, in vitro translation of Elf-1, supershift with Elf-1 antisera, transient transfection with mutagenized reporter constructs\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding and functional methods; single lab\",\n      \"pmids\": [\"8228815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Elf-1 is the primary Ets factor binding to the Ets binding sites (zEBS1 and zEBS2) in the TCR zeta-chain promoter; mutagenesis of these sites markedly reduces transcription, and ectopic Elf-1 expression increases TCR zeta-chain promoter activity mapping to zEBS1 and zEBS2. A GAL4-Elf-1 fusion also trans-activates TCR zeta-chain promoter constructs containing GAL4 sites.\",\n      \"method\": \"EMSA, in vitro mutagenesis, ectopic expression in COS-7 cells, GAL4 fusion trans-activation assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — EMSA, mutagenesis, ectopic expression, and GAL4 fusion assays in one study; multiple orthogonal methods\",\n      \"pmids\": [\"9510181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"PU.1 and Elf-1 both bind to the SCL (tal-1) promoter 1b Ets motifs and transactivate the promoter in mast cells; transcription factors PU.1, Elf-1, Sp1, and Sp3 are present in mast cell extracts and bind promoter 1b.\",\n      \"method\": \"Gel shift assay, reporter transactivation, ChIP (not explicitly stated but implied by promoter binding), transient transfection\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and transactivation assays; single lab\",\n      \"pmids\": [\"9786909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Elf-1 binds to the Ets site in the FcεRI alpha-chain promoter and is one of the factors (with GATA-1) essential for promoter activity; Elf-1 binding is required for alpha-chain-producing cell specificity.\",\n      \"method\": \"EMSA with nuclear extracts and in vitro-translated proteins, transient transfection reporter assays with mutagenized promoter\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus functional mutagenesis; single lab\",\n      \"pmids\": [\"10395650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Elf-1 binds to the P4 Ets site in the CD4 promoter and specifically activates CD4 promoter activity; no other tested Ets family members bound this site in T cells.\",\n      \"method\": \"EMSA, transient transfection reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus functional reporter assay; single lab\",\n      \"pmids\": [\"10347164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Elf-1 and PU.1 both bind to a promoter element mutated in chronic granulomatous disease (CGD) patients (-57 to -52 bp) and transactivate the gp91(phox) promoter; CGD-associated point mutations at -57 and -55 significantly reduce Elf-1 and PU.1 binding and transactivation, but no synergy occurs between Elf-1 and PU.1 on this promoter.\",\n      \"method\": \"EMSA, transient transfection reporter assays with CGD mutations, overexpression in HeLa and PLB985 cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and reporter assays with disease-relevant mutations; single lab\",\n      \"pmids\": [\"10233904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Elf-1 does not cooperate with GATA3 to activate the human IL-5 promoter (unlike Ets1 and Ets2), demonstrating specificity among closely related Ets factors in this context.\",\n      \"method\": \"Transient transfection reporter assays in Jurkat T-cells and Kasumi myeloid cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — negative finding for Elf-1 confirmed by reporter assay; single lab, single method\",\n      \"pmids\": [\"10212281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Elf-1 is a transcriptional regulator of the Tie2 gene in endothelial cells; chicken Elf-1 (cELF-1) is expressed in developing blood vessels, binds conserved Ets sites in Tie1 and Tie2 promoters, and strongly transactivates these genes. Elf-1-containing complexes in CAM blood vessel extracts are recognized by anti-cELF-1 antibody.\",\n      \"method\": \"In situ hybridization, immunohistochemistry, RT-PCR, EMSA with antibody supershift, transient transfection reporter assays\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA with supershift plus transactivation assays in vascular tissue; single lab\",\n      \"pmids\": [\"11157678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Elf-1 exists as an 80-kDa form in the cytoplasm and as a 98-kDa form in the nucleus; phosphorylation and O-linked glycosylation contribute to the increased molecular mass. The 98-kDa nuclear form is released from cytoplasmic retinoblastoma protein tethering and moves to the nucleus to bind the TCR zeta-chain promoter; the cytoplasmic 98-kDa form undergoes proteasomal degradation.\",\n      \"method\": \"Subcellular fractionation, Western blot, phosphatase and glycosidase treatment, immunoprecipitation, DNA binding assay, proteasome inhibitor experiments\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical methods (fractionation, PTM identification, Rb co-IP, promoter binding) establishing localization-function link\",\n      \"pmids\": [\"11884456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Defective production of the functional 98-kDa nuclear form of Elf-1 in SLE T cells results from abnormal posttranslational modifications; two distinct defects were identified: decreased 98-kDa levels OR normal apparent levels but abnormal isoelectric focusing pattern. This defect causes reduced TCR zeta-chain transcription.\",\n      \"method\": \"Subcellular fractionation, Western blot, isoelectric focusing, transcription/translation analysis, reporter assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical methods in primary SLE T cells; single lab\",\n      \"pmids\": [\"12421992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Elf-1 binds to conserved Ets sites in the scl/tal-1 5' (-3.8) bifunctional enhancer in hematopoietic progenitors and endothelial cells in vivo, as demonstrated by ChIP; the -3.8 enhancer (but not the +18/19 enhancer) is required for scl transcription.\",\n      \"method\": \"ChIP, comparative genomics, transgenic mice, knockout approach\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ChIP plus transgenic/knockout validation; single lab\",\n      \"pmids\": [\"14966269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Elf-1 was identified via DNA affinity chromatography as the Ets protein with highest affinity for the TdT promoter D' element; a D' mutation that selectively reduces Elf-1 binding greatly reduces TdT promoter activity in immature T and B cells.\",\n      \"method\": \"DNA affinity chromatography, peptide microsequencing, immunoblot, transient transfection reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — affinity chromatography with microsequencing plus mutagenesis functional assay; single lab\",\n      \"pmids\": [\"8887642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Elf-1, Fli-1, and Ets1 bind in vivo to conserved Ets sites in the LMO2 proximal promoter in hematopoietic and endothelial cells, and these sites are required for promoter activity; transgenic analysis confirmed the proximal promoter drives endothelial expression in vivo.\",\n      \"method\": \"ChIP, EMSA, transient/stable transfection reporter assays, transgenic mice\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ChIP plus multiple cell-line validations and transgenic confirmation; single lab\",\n      \"pmids\": [\"15994290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A 34-amino-acid peptide corresponding to the terminal ETS domain of ELF-1 blocks ELF-1 function; a TAT-fused version enters endothelial cell nuclei, reduces Tie2 and eNOS expression, inhibits angiopoietin-1-mediated endothelial cell migration, and systemically attenuates B16 melanoma tumor growth and tumor angiogenesis in nude mice.\",\n      \"method\": \"Cell-penetrating peptide delivery, reporter assays, endothelial cell migration assay, mouse tumor xenograft model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional domain-blocking peptide with in vitro and in vivo phenotypic readouts; single lab\",\n      \"pmids\": [\"16352813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Elf1 (yeast) is a transcription elongation factor that associates co-transcriptionally with actively transcribed regions; synthetic lethality with mutations in Spt4, Spt5, Spt6, and Paf1 complex members identifies it as part of the elongation machinery. Association is partially dependent on Spt4 and Spt6. Elf1 is purified in association with casein kinase II.\",\n      \"method\": \"Genetic screen (synthetic lethality), ChIP genome-wide, protein purification/mass spectrometry\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis screen plus ChIP plus biochemical purification; multiple orthogonal methods in single study\",\n      \"pmids\": [\"16260625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Fli-1, Erg, and Elf-1 bind in vivo to conserved Ets sites in both the endoglin promoter and a -8 kb enhancer in endothelial cells; both elements depend on these Ets sites for activity.\",\n      \"method\": \"ChIP, comparative genomics, transient transfection reporter assays, transgenic mice\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ChIP plus functional reporter assays and transgenic validation; single lab\",\n      \"pmids\": [\"16484587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Elf-1 binds to two Ets binding sites in the LAT gene proximal promoter and overexpression of Elf-1 augments LAT promoter activity; a Runx-1 binding site adjacent to one Ets site has an inhibitory effect.\",\n      \"method\": \"EMSA, transient transfection reporter assays, Elf-1 overexpression\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus reporter transactivation; single lab\",\n      \"pmids\": [\"16464244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Yeast Elf1 is phosphorylated by protein kinase CK2 at Ser95 and Ser117 in vitro; Elf1 co-immunoprecipitates with both catalytic (α, α') and regulatory (β, β') subunits of CK2.\",\n      \"method\": \"In vitro kinase assay, MALDI-MS phosphosite identification, co-immunoprecipitation\",\n      \"journal\": \"Journal of biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay with MS-identified sites plus co-IP; single lab\",\n      \"pmids\": [\"16756761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Elf-1 specifically binds to GGAA elements in the FcRγ promoter and represses FcRγ expression; forced Elf-1 expression suppresses FcRγ, while siRNA knockdown of Elf-1 increases FcRγ expression.\",\n      \"method\": \"EMSA, overexpression and siRNA knockdown, reporter assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA with gain- and loss-of-function showing bidirectional transcriptional regulation; single lab\",\n      \"pmids\": [\"17878388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PP2A dephosphorylates Elf-1 at Thr-231, resulting in limited nuclear 98-kDa Elf-1 form and decreased binding to CD3ζ and FcRγ promoters. Aberrantly increased PP2A in lupus T cells causes this dephosphorylation. Suppression of PP2A expression increases CD3ζ and decreases FcRγ expression, correcting early signaling defects.\",\n      \"method\": \"Phosphatase activity assays, phosphosite-specific analysis, ChIP, siRNA knockdown of PP2A, Western blot\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — identified writer/eraser (PP2A), specific phosphosite (Thr-231), functional consequence on promoter binding and gene expression, confirmed by loss-of-function; multiple orthogonal methods\",\n      \"pmids\": [\"18714041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Elf-1 negatively regulates FcεRI alpha-chain expression in primary mast cells (BMMC) by suppressing PU.1-mediated transcription; Elf-1 siRNA knockdown increases alpha-chain transcription and increases PU.1 occupancy at the promoter (by ChIP), while Elf-1 overexpression suppresses alpha-chain promoter activity.\",\n      \"method\": \"siRNA knockdown, overexpression, transient reporter assay, ChIP\",\n      \"journal\": \"Immunogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA plus overexpression plus ChIP in primary cells; single lab\",\n      \"pmids\": [\"18629488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"O-GlcNAc modification inhibits a physical interaction between Sp1 and Elf-1 transcription factors, negatively regulating transcription of the Pem gene.\",\n      \"method\": \"Co-immunoprecipitation, O-GlcNAc modification analysis, reporter assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP demonstrating interaction modulated by PTM, with reporter readout; single lab\",\n      \"pmids\": [\"19285002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Elf-1-deficient mice exhibit a partial, cell-intrinsic block in NKT cell development affecting selection, survival, and maturation, with residual NKT cells producing less cytokine upon antigen stimulation; NK cell proportions are normal, demonstrating selective requirement for Elf-1 in NKT but not NK cell development.\",\n      \"method\": \"Knockout mouse model (Elf-1⁻/⁻), flow cytometry, bone marrow chimera (cell-intrinsic defect), cytokine stimulation assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with specific cellular phenotype, cell-autonomous effect confirmed by chimera experiments; multiple readouts\",\n      \"pmids\": [\"21148815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PU.1 is a major upstream transcriptional regulator of Elf-1 (identified by ChIP-chip); Elf-1 downregulation is necessary for terminal erythroid differentiation (overexpression of Elf-1 inhibits erythroid maturation).\",\n      \"method\": \"ChIP-chip (locus-wide), comparative genomics, overexpression in primary murine fetal liver erythroid differentiation assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-chip identifies upstream regulator, functional overexpression confirms role in differentiation; single lab\",\n      \"pmids\": [\"20525788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ELF1 binds to a conserved ETS site in the MEIS1 promoter and is enriched there by ChIP; siRNA-mediated knockdown of ELF1 decreases MEIS1 expression in K562 cells and primary human samples, identifying ELF1 as a positive transcriptional regulator of MEIS1.\",\n      \"method\": \"EMSA, ChIP, siRNA knockdown with mRNA quantification\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus in vivo ChIP plus functional knockdown; single lab\",\n      \"pmids\": [\"20600580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"O-GlcNAc modification of Elf-1 promotes its nuclear localization; in intestinal epithelial cells (IECs), O-GlcNAc modification of Elf-1 is significantly lower than in monocytes, preventing nuclear translocation of Elf-1 and thereby relieving Elf-1-mediated repression of the Tollip gene, which explains elevated Tollip expression in IECs.\",\n      \"method\": \"Subcellular fractionation, Western blot for O-GlcNAc modification, comparison of Caco-2 (IEC) vs. THP-1 (monocyte) cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical fractionation plus PTM analysis linked to functional gene expression outcome; single lab\",\n      \"pmids\": [\"21867680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ELF1 has two distinct tumor-suppressive roles in prostate cancer: (1) inhibiting cell migration and EMT by interfering with oncogenic ETS factors at ETS/AP-1 cis-regulatory sequences, and (2) activating genes promoting senescence at unique ELF1-targeted sites. ELF1 knockdown increases docetaxel resistance.\",\n      \"method\": \"Genome-wide chromatin mapping (ChIP-seq), cell migration assay, EMT marker analysis, senescence assay, siRNA knockdown, drug resistance assay\",\n      \"journal\": \"Genes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide binding mapping plus multiple functional assays; single lab\",\n      \"pmids\": [\"30603056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ELF1 inhibits replication of eight diverse RNA and DNA viruses (independent of type I interferons) in a broadly antiviral transcriptional program distinct from interferon signatures; Elf1-deficient mice show enhanced susceptibility to influenza A virus. ELF1's antiviral effect is independent of STAT1 and JAK phosphorylation.\",\n      \"method\": \"Microscopy-based viral infection quantification, Elf1-knockout mouse infection, RNA-seq comparative expression analysis, JAK inhibitor and STAT1-KO experiments\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse in vivo validation plus multiple virus species plus mechanistic dissection from IFN pathway; multiple orthogonal methods\",\n      \"pmids\": [\"31682641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In yeast, elongation factor Elf1 inhibits RNA Pol II transcriptional bypass of CTG and CAG trinucleotide repeat slip-out structures (individually and cooperatively with Spt4/5), while Spt4/5 promotes Pol II transcription through B-form CTG•CAG duplex DNA—opposite roles depending on DNA template structure.\",\n      \"method\": \"In vitro reconstituted yeast transcription system with defined DNA templates\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical reconstitution in vitro with purified components and defined substrates; mechanistically definitive\",\n      \"pmids\": [\"33877330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Yeast Elf1 promotes TC-NER by enhancing Rad26 (CSB ortholog) interactions with lesion-arrested RNA Pol II; cryo-EM structures of Pol II-Rad26 stalled at different obstacles show Rad26 uses a common mechanism to recognize stalled Pol II with additional interactions at lesion-arrested Pol II, and Elf1 further stabilizes Rad26–Pol II interactions specifically at lesions. Biochemical and genetic data support the Elf1–Rad26 interplay in TC-NER initiation.\",\n      \"method\": \"Cryo-EM structural determination, biochemical assays, genetic epistasis in yeast\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structures plus biochemical assays plus genetic validation; multiple orthogonal methods in single study\",\n      \"pmids\": [\"38194460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The C-terminal domain (CTD) of yeast Elf1 is required for efficient TC-NER genome-wide; the Elf1 CTD binds the pleckstrin homology (PH) domain of the p62 subunit of TFIIH in vitro, and a conserved TFIIH-interaction region (TIR) in the CTD is necessary for this binding and for TC-NER—functionally analogous to the TIR in mammalian UVSSA that recruits TFIIH.\",\n      \"method\": \"CPD-seq (genome-wide repair mapping), in vitro binding assay, CTD deletion/mutation analysis, structural/sequence comparison\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide repair mapping plus in vitro binding with domain mutagenesis; multiple orthogonal methods; functional analogy validated structurally\",\n      \"pmids\": [\"39043658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In zebrafish, Elf1 is a cell-autonomous regulator of macrophage development with minimal effect on neutrophil differentiation; CRISPR/Cas9 knockout and dominant-negative overexpression demonstrate Elf1 is required for macrophage infiltration to tissue injury. Overexpression of cxcr4b (a downstream Elf1 target essential for cell migration) rescues the macrophage defect, placing cxcr4b downstream of Elf1.\",\n      \"method\": \"Morpholino knockdown, CRISPR/Cas9 knockout, dominant-negative overexpression in macrophages, rescue with cxcr4b overexpression, tissue injury model\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO and rescue experiments establishing pathway position; single lab in zebrafish model\",\n      \"pmids\": [\"40141178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ELF1 binds to promoters of METTL3 and YTHDF2 and transactivates their expression; elevated ELF1 in nucleus pulposus cells promotes m6A methylation of E2F3 mRNA via METTL3, which is then recognized and destabilized by YTHDF2, causing E2F3 mRNA degradation, G1/S cell cycle arrest, and NPC senescence.\",\n      \"method\": \"ChIP-seq, ChIP, proteomic/RNA-seq, MeRIP-qPCR, RNA pull-down, luciferase reporter assay, AAV5 overexpression and KO mice, small molecule targeting\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus multiple binding assays plus in vivo KO/OE; single lab, complex multi-step pathway\",\n      \"pmids\": [\"40467575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ELF-1 deficiency in non-hematopoietic (epithelial) cells intrinsically worsens DSS-induced colitis in mice; ELF-1 directly regulates Rack1 gene expression in colonic epithelial tissue and its absence enhances pro-inflammatory chemokine production, leading to neutrophil and immune cell infiltration.\",\n      \"method\": \"Conditional/global ELF-1 KO mouse, bone marrow transfer experiments (confirming non-hematopoietic cell-intrinsic defect), DSS colitis model, ChIP, chemokine quantification\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bone marrow chimera confirms cell-autonomous non-hematopoietic role, ChIP identifies direct target Rack1; single lab\",\n      \"pmids\": [\"40057592\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ELF1 (E74-like factor 1) is a lymphoid-enriched ETS-family transcription factor that binds GGAA-core Ets sites to regulate a broad set of hematopoietic, endothelial, and immune-cell genes (including IL-2, GM-CSF, TCRζ, FcRγ, CD4, LAT, Tie2, LMO2, and SCL); its transcriptional activity is controlled by posttranslational modifications—phosphorylation (including by the PP2A phosphatase at Thr-231) and O-GlcNAcylation—that govern its nuclear import and DNA-binding capacity and its regulated release from retinoblastoma protein; as a GPI-anchored ligand it also activates Eph-family receptor tyrosine kinases to mediate repellent axon guidance and topographic neural map formation; and, through its yeast/mammalian ortholog ELOF1/Elf1, it functions as a transcription elongation factor that recruits TFIIH via its C-terminal domain to initiate transcription-coupled nucleotide excision repair at RNA Pol II lesion-arrest sites.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ELF1 (Elf-1) is a lymphoid-enriched ETS-family transcription factor that recognizes GGAA-core Ets binding sites to control a broad program of hematopoietic, immune, and endothelial genes [#0, #3]. Selective recognition of the GGAA core is conferred by a single residue in conserved region III of its Ets domain, distinguishing it from Ets1/Ets2 [#0, #3]. Through this activity it directly regulates immune and signaling genes including IL-2, GM-CSF, the TCR \\u03b6-chain, CD4, LAT, TdT, and Fc receptor genes [#0, #4, #17, #20, #32, #27], frequently acting combinatorially with other factors\\u2014cooperatively with AP-1 (c-Fos/JunB) at the GM-CSF PB1 element and with PU.1 at hematopoietic promoters such as SCL/tal-1 and gp91phox [#4, #18, #21]. ELF1 can function as either an activator or a repressor depending on context, suppressing FcR\\u03b3 and antagonizing PU.1-driven Fc\\u03b5RI \\u03b1-chain transcription [#34, #36]. In the vascular system it transactivates endothelial genes including Tie1/Tie2, LMO2, and endoglin, and is required for angiopoietin-1-driven endothelial migration and tumor angiogenesis [#23, #28, #31, #29]. Its activity is governed by posttranslational control of localization: ELF1 is tethered in the cytoplasm by the underphosphorylated retinoblastoma protein and released upon Rb phosphorylation after T-cell activation [#2], and a nuclear 98-kDa form generated through phosphorylation and O-GlcNAcylation is required for promoter binding [#24]. PP2A dephosphorylation at Thr-231 limits the nuclear form and reduces binding to CD3\\u03b6 and FcR\\u03b3 promoters, a defect amplified in lupus T cells, while O-GlcNAcylation controls nuclear translocation and modulates interaction with Sp1 [#35, #37, #41]. Genetic loss-of-function defines physiological roles in NKT-cell development, macrophage development via cxcr4b, intestinal epithelial homeostasis via Rack1, and a broadly antiviral transcriptional program independent of type I interferon [#38, #47, #49, #43]. The yeast ortholog Elf1 acts as a transcription elongation factor associated with the Spt4/Spt5/Spt6/Paf1 machinery and promotes transcription-coupled nucleotide excision repair by stabilizing Rad26 at lesion-arrested RNA Pol II and recruiting TFIIH through a C-terminal TFIIH-interaction region [#30, #45, #46].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established ELF1 as a distinct Ets-family transcription factor with its own DNA-binding specificity, answering whether a new factor governed inducible immune-gene enhancers.\",\n      \"evidence\": \"EMSA, methylation interference, and in vitro mutagenesis of the IL-2 and HIV-2 enhancers in T cells\",\n      \"pmids\": [\"1545787\", \"1527846\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular signals controlling inducible binding not yet defined\", \"No domain map of activation versus DNA-binding regions\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Defined the molecular basis of ELF1's GGAA-core site selectivity and its combinatorial action with AP-1, explaining how it is targeted distinctly from Ets1/Ets2.\",\n      \"evidence\": \"Reciprocal Ets-domain mutagenesis plus cooperative supershift EMSA and reporter assays at GM-CSF and viral enhancers\",\n      \"pmids\": [\"8255775\", \"8289796\", \"8350410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural detail of the Ets-domain/DNA interface not resolved\", \"Genome-wide site repertoire unknown at this stage\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Identified Rb-mediated cytoplasmic tethering and activation-dependent release as the first layer of post-translational control over ELF1 activity.\",\n      \"evidence\": \"Reciprocal co-IP, in vitro binding, and dominant-negative phosphorylation-defective Rb in T cells\",\n      \"pmids\": [\"8493578\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for Rb phosphorylation in this context not identified\", \"Mechanism linking release to nuclear import unresolved\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Revealed an unexpected, second identity: a GPI-anchored Eph-receptor ligand, raising the question of whether the timeline conflates two molecularly distinct entities sharing the ELF-1 name.\",\n      \"evidence\": \"Receptor-alkaline phosphatase fusion expression-library screen identifying ELF-1 as a Mek4/Sek ligand\",\n      \"pmids\": [\"7522971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between the GPI-anchored ligand and the nuclear ETS factor not reconciled in the corpus\", \"Whether these are the same gene product is not established\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Showed the ELF-1 Eph ligand forms a graded guidance cue, addressing how complementary receptor/ligand gradients pattern the retinotectal map.\",\n      \"evidence\": \"RNA in situ hybridization and receptor-AP fusion binding across tectum and retina\",\n      \"pmids\": [\"7634327\", \"7876076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling of activated Eph receptor only partially defined\", \"Substrate identity (62 kDa) unknown\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Demonstrated repellent, topographically specific axon guidance by the ELF-1 ligand and constrained the cells responsive to it.\",\n      \"evidence\": \"In vitro stripe/collapse assays and retroviral in vivo overexpression with axon mapping\",\n      \"pmids\": [\"8797822\", \"9135142\", \"8855326\", \"9232603\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor-clustering requirement only partially mechanistic\", \"In vivo loss-of-function for guidance not shown\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Mapped ELF1's transcriptional architecture\\u2014constitutive nuclear localization, an N-terminal activation domain, and an internal repression domain\\u2014answering how it both activates and restrains transcription.\",\n      \"evidence\": \"Subcellular fractionation and Gal4-fusion deletion mutagenesis with reporter assays\",\n      \"pmids\": [\"9180266\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Coactivators/corepressors recruited by these domains not identified\", \"Conflicts with later cytoplasmic-tethering data not reconciled here\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Extended ELF1's regulatory reach across immune-gene promoters and revealed it can act as a repressor as well as an activator.\",\n      \"evidence\": \"EMSA, supershift, in vivo footprinting, and mutagenesis at IL-2R\\u03b1, IL-3, and TdT promoters\",\n      \"pmids\": [\"8943338\", \"9104808\", \"8228815\", \"8887642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of activator-versus-repressor outcome not defined\", \"Cofactor partners at repressive sites unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined ELF1 as a direct regulator of additional immune/hematopoietic genes and its functional specificity relative to other Ets factors.\",\n      \"evidence\": \"EMSA and reporter assays at CD4, Fc\\u03b5RI \\u03b1-chain, gp91phox, IL-5, and SCL promoters\",\n      \"pmids\": [\"10347164\", \"10395650\", \"10233904\", \"10212281\", \"9786909\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Why ELF1 fails to cooperate with GATA3 (unlike Ets1/2) mechanistically unexplained\", \"In vivo occupancy not established for most targets\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Connected molecular-mass forms of ELF1 to localization and function, establishing that a phosphorylated/O-GlcNAcylated 98-kDa nuclear form is the active species and its loss underlies SLE T-cell defects.\",\n      \"evidence\": \"Fractionation, PTM enzymatic stripping, IEF, Rb co-IP, and promoter binding in normal and SLE T cells\",\n      \"pmids\": [\"11884456\", \"12421992\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymes generating the 98-kDa form not yet identified\", \"Precise PTM sites mapped only later\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Established ELF1 as a transcriptional driver of the endothelial/hematopoietic program and a target for anti-angiogenic intervention.\",\n      \"evidence\": \"In situ, EMSA/supershift, ChIP, transgenics, and a dominant-negative ETS-domain peptide in tumor xenografts (Tie1/Tie2, LMO2, endoglin, eNOS)\",\n      \"pmids\": [\"11157678\", \"15994290\", \"16484587\", \"16352813\", \"14966269\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Redundancy with Fli-1/Erg/Ets1 at shared sites not resolved\", \"Direct endothelial loss-of-function phenotype not shown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified the yeast ortholog Elf1 as a transcription elongation factor physically and genetically linked to the elongation machinery and to CK2.\",\n      \"evidence\": \"Synthetic-lethality screen, genome-wide ChIP, and protein purification/MS; in vitro CK2 phosphorylation at Ser95/Ser117\",\n      \"pmids\": [\"16260625\", \"16756761\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of CK2 phosphorylation not established\", \"Connection between elongation role and mammalian ETS function unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Pinpointed PP2A-mediated dephosphorylation at Thr-231 as the eraser controlling the nuclear ELF1 pool and its target binding, mechanistically linking PTM to lupus T-cell gene dysregulation.\",\n      \"evidence\": \"Phosphatase and phosphosite-specific assays, ChIP, and PP2A siRNA in T cells\",\n      \"pmids\": [\"18714041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase opposing PP2A at Thr-231 not identified\", \"How dephosphorylation prevents nuclear accumulation mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined O-GlcNAcylation as a switch controlling ELF1 nuclear translocation and its Sp1 interaction, extending PTM control of localization-dependent function.\",\n      \"evidence\": \"Co-IP, O-GlcNAc analysis, fractionation, and reporter assays (Pem and Tollip genes; Caco-2 vs THP-1)\",\n      \"pmids\": [\"19285002\", \"21867680\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"O-GlcNAc sites on ELF1 not mapped\", \"Cell-type determinants of differential glycosylation unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed ELF1 within hematopoietic differentiation circuits as both a PU.1 target and a regulator of MEIS1 and erythroid maturation, and defined its requirement in NKT-cell development.\",\n      \"evidence\": \"ChIP-chip, EMSA/ChIP, overexpression/knockdown in erythroid and K562 cells, and Elf-1\\u2212/\\u2212 mice with chimeras\",\n      \"pmids\": [\"20525788\", \"20600580\", \"21148815\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ELF1 target genes in NKT cells not defined\", \"Mechanism of erythroid block downstream of ELF1 unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Uncovered a broad, interferon-independent antiviral transcriptional program directed by ELF1, defining a novel innate-immune effector role.\",\n      \"evidence\": \"Multi-virus infection quantification, RNA-seq, Elf1-KO mouse influenza challenge, and JAK/STAT1 inhibition\",\n      \"pmids\": [\"31682641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct antiviral target genes not enumerated\", \"Mechanism of IFN-independent induction of the program unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the structural and biochemical mechanism by which the yeast ortholog initiates transcription-coupled NER\\u2014stabilizing Rad26 at lesion-stalled Pol II and recruiting TFIIH via its C-terminal TFIIH-interaction region.\",\n      \"evidence\": \"Cryo-EM of Pol II\\u2013Rad26 complexes, in vitro reconstitution, CPD-seq, and CTD-domain binding/mutagenesis to TFIIH p62 PH domain\",\n      \"pmids\": [\"38194460\", \"39043658\", \"33877330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mammalian ELF1 retains an equivalent TC-NER function not tested\", \"Relationship between elongation role and lesion-bypass control not fully integrated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended ELF1's in vivo physiological roles to macrophage development, intestinal epithelial homeostasis, and m6A-coupled cell-cycle control, defining direct downstream effectors.\",\n      \"evidence\": \"Zebrafish CRISPR/dominant-negative with cxcr4b rescue; conditional KO mouse colitis with Rack1 ChIP; ChIP-seq of METTL3/YTHDF2 with E2F3 m6A in nucleus pulposus cells\",\n      \"pmids\": [\"40141178\", \"40057592\", \"40467575\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect nature of some target relationships not fully separated\", \"Conservation of these roles to human tissues not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether the nuclear ETS transcription factor and the GPI-anchored Eph ligand reported under the ELF-1 name are the same gene product, and how the elongation/TC-NER ortholog function relates to mammalian ETS activity, remains unresolved in this corpus.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No experiment in the corpus reconciles the transcription-factor and Eph-ligand identities\", \"Mammalian counterpart of the yeast elongation/TC-NER role not directly tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3, 17, 23, 34, 42]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 3, 27, 40]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [6, 8, 9, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [11, 24, 41]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [24, 41]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 17, 23, 30]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [38, 43, 49]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [45, 46]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 10, 47]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RB1\", \"PU.1\", \"Sp1\", \"EPHA3\", \"JunB\", \"FOS\", \"Rad26\", \"TFIIH\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}