{"gene":"NFIL3","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1994,"finding":"E4BP4 transcriptional repression was mapped to a minimal 65-amino-acid domain near the C-terminus; a charge-configuration mutation in this domain abolished repressor activity. The mechanism involves interaction with components of the general transcription machinery rather than resembling known Krüppel/Engrailed repression domains.","method":"Deletion mapping, GAL4 fusion reporter assays, mutagenesis","journal":"Nucleic Acids Research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro transcription repression assay with mutagenesis, heterologous domain transfer, single lab with multiple orthogonal methods","pmids":["8127655"],"is_preprint":false},{"year":1995,"finding":"NF-IL3A (NFIL3) binds the IL-3 promoter footprint A region (TAATTACGTCTG; minimal site ATTACG) and acts as a transcriptional activator of the IL-3 promoter in resting T cells; the binding site is required for transactivation.","method":"DNase I footprinting, gel shift assay, cotransfection reporter assay","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro DNA binding defined by footprinting and EMSA, functional validation by cotransfection with binding-site mutagenesis, single lab","pmids":["7565758"],"is_preprint":false},{"year":1995,"finding":"E4BP4 protein produced in Sf9 insect cells is phosphorylated, and this phosphorylation enhances its DNA-binding activity compared with bacterially produced (unphosphorylated) protein.","method":"Baculovirus expression, gel shift assay, post-translational modification analysis","journal":"Biochimica et Biophysica Acta","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — comparative binding assay with differently expressed proteins, single lab, single method","pmids":["8547328"],"is_preprint":false},{"year":1996,"finding":"The E4BP4 repression domain interacts specifically with the TBP-binding repressor protein Dr1; E4BP4 mutants defective in repression are also deficient in Dr1 binding, indicating that Dr1 recruitment mediates E4BP4 transcriptional repression.","method":"Protein–protein interaction assay (in vitro binding), repression-domain mutant analysis","journal":"Nucleic Acids Research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct binding assay with functional mutant correlation, single lab, single method","pmids":["8836190"],"is_preprint":false},{"year":1997,"finding":"NFIL3/E4BP4 expression is regulated by IL-3 in murine pro-B cells as a delayed-early gene requiring de novo protein synthesis; enforced NFIL3 expression promotes survival (but not growth) of IL-3-deprived pro-B cells, positioning NFIL3 downstream of IL-3 in an anti-apoptotic signaling pathway.","method":"Northern blot, cytokine withdrawal survival assay, cDNA overexpression","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Moderate — gain-of-function rescue of apoptosis with IL-3-dependence characterization, multiple methods, single lab","pmids":["9122243"],"is_preprint":false},{"year":1997,"finding":"E4BP4 mRNA is induced by the synthetic glucocorticoid dexamethasone in mouse fibroblasts, and E4BP4-binding elements are present in the promoters of glucocorticoid-repressed genes COX-2, iNOS, and cPLA2, suggesting E4BP4 mediates glucocorticoid gene repression.","method":"cDNA subtraction screening, Northern blot, promoter sequence analysis","journal":"Biochemical and Biophysical Research Communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — expression induction confirmed but functional link to promoters is computational/correlative only, single lab","pmids":["9125190"],"is_preprint":false},{"year":1999,"finding":"NFIL3 expression is regulated by oncogenic Ras through both the Raf-MAPK and PI3K pathways in IL-3-dependent pro-B cells; NFIL3-mediated survival is independent of Bcl-xL, defining two parallel IL-3 survival pathways.","method":"Oncogenic Ras mutants, kinase pathway inhibitors, survival assays","journal":"Molecular and Cellular Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic pathway dissection with pathway-specific inhibitors and oncogenic mutants, single lab","pmids":["10082541"],"is_preprint":false},{"year":1999,"finding":"E4BP4 represses HBV core promoter and enhancer II transcription; its repressive mechanism requires DNA binding (binding site occlusion) and does not strictly require a separate repression domain beyond the DNA-binding domain.","method":"Transient transfection reporter assay, E4BP4 overexpression, antisense experiments","journal":"Journal of Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — multiple reporter constructs and antisense reversal, single lab","pmids":["10074173"],"is_preprint":false},{"year":2000,"finding":"E4BP4 binds to HBV enhancer II (nucleotides 1640–1663) and suppresses its transcriptional activity, in contrast to HLF and FTF which activate the same element.","method":"Yeast one-hybrid screening, transcriptional activity assays","journal":"Journal of Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — yeast one-hybrid plus transcriptional assays, single lab","pmids":["10627534"],"is_preprint":false},{"year":2001,"finding":"E4BP4 oscillates in antiphase to the PAR transcription factors (DBP, HLF, TEF) in the SCN and liver; E4BP4 suppresses while PAR proteins activate transcription from the shared PAR/E4BP4 binding site; E4BP4 cannot dimerize with PAR proteins but competes for the same DNA sites. In Cry-deficient mice, E4bp4 levels are sustained low while dbp is high, placing E4BP4 within the core circadian oscillatory mechanism.","method":"In situ hybridization, luciferase reporter assay, EMSA, Cry-knockout mouse analysis","journal":"Genes & Development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (EMSA, reporter, in vivo mouse genetics), replicated across tissues","pmids":["11316793"],"is_preprint":false},{"year":2002,"finding":"IL-3-dependent transcription of E4bp4 requires a GATA motif downstream of the major transcription start site; both GATA-1 and GATA-2 bind this site in vitro and in vivo, with GATA-1 binding confirmed by ChIP; GATA-1 overexpression transactivates the E4bp4 reporter and modulates apoptosis on IL-3 withdrawal.","method":"Promoter deletion analysis, EMSA, chromatin immunoprecipitation, overexpression/apoptosis assay","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP in vivo binding plus functional reporter and apoptosis readout, single lab, multiple methods","pmids":["12023274"],"is_preprint":false},{"year":2003,"finding":"PTH rapidly and transiently induces E4BP4 as a primary response gene in osteoblasts (no protein synthesis required); E4BP4 overexpression inhibits EBPRE-containing promoters and attenuates PTH-induced COX-2 promoter activity in osteoblasts.","method":"Northern blot, cycloheximide experiments, reporter assay, E4BP4 overexpression","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — primary response gene characterization with functional downstream reporter assay, single lab","pmids":["12743120"],"is_preprint":false},{"year":2004,"finding":"Casein kinase 1ε (CK1ε) physically associates with E4BP4 and phosphorylates it at Ser182; CK1ε-catalyzed phosphorylation leads to proteasomal degradation of E4BP4 and attenuates E4BP4 nuclear accumulation and transcriptional repression of cPer2.","method":"Co-immunoprecipitation, in vitro kinase assay, proteasome inhibitor experiments, site-directed mutagenesis, luciferase reporter assay","journal":"Current Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted phosphorylation with mutagenesis, co-IP, functional reporter, single lab with multiple orthogonal methods","pmids":["15182670"],"is_preprint":false},{"year":2004,"finding":"E4BP4 overexpression protects embryonic motoneurons from apoptosis induced by neurotrophic factor withdrawal or death receptor activation, and promotes neuronal cell size and axonal growth (3.5-fold longer axons) in a PI3K-dependent manner; in vivo overexpression in chick embryos reduced dying motoneurons by 45%.","method":"Motoneuron electroporation, survival and axon growth assays, PI3K inhibition, in ovo overexpression","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in primary neurons and in vivo, PI3K pathway dependency shown, single lab","pmids":["15306565"],"is_preprint":false},{"year":2004,"finding":"E4BP4 represses VWF promoter activity by binding a negative response element at nucleotides +96/+105 of the VWF promoter in vivo, as demonstrated by ChIP; the repressive mechanism is cell-type specific (larger E4BP4 forms bind DNA in HepG2 cells; smaller forms in endothelial cells do not bind directly but may sequester co-repressors).","method":"Chromatin immunoprecipitation, promoter reporter assays, site mutagenesis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms in vivo binding, mutagenesis shows functional dependence, single lab","pmids":["15498853"],"is_preprint":false},{"year":2006,"finding":"E4BP4 negatively regulates Per2 mRNA oscillation by binding a specific B-site in the mPer2 promoter; ChIP shows peak E4BP4 binding corresponds to trough Per2 mRNA; both the B-site and the E2 enhancer are required for robust circadian Per2 oscillation in the cell-autonomous clock.","method":"siRNA knockdown, luciferase reporter assay with promoter mutants, chromatin immunoprecipitation","journal":"Nucleic Acids Research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP in vivo, loss-of-function, and reporter mutagenesis in cell-autonomous clock, single lab, multiple methods","pmids":["17182630"],"is_preprint":false},{"year":2007,"finding":"E4BP4 physically interacts with PER2 (requiring the C-terminal repression domain) and with CRY2; these interactions place E4BP4 in a negative regulator complex of the mammalian circadian clock.","method":"Co-immunoprecipitation, deletion mutant analysis","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single Co-IP experiment identifying interactions, no reconstitution, single lab","pmids":["17274955"],"is_preprint":false},{"year":2009,"finding":"E4BP4/NFIL3 is essential for NK cell development in a cell-intrinsic manner, acting downstream of the IL-15 receptor and upstream of (and through) the transcription factor Id2; E4BP4-deficient mice specifically lack NK cells while retaining B, T, and NKT cells.","method":"Nfil3-/- mouse generation, bone marrow reconstitution, cytotoxicity assays, hematopoietic progenitor overexpression","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent Nfil3-/- mouse lines (PMIDs 19749763 and 19995955), cell-intrinsic chimera experiments, multiple functional readouts","pmids":["19749763","19995955"],"is_preprint":false},{"year":2009,"finding":"NFIL3 is required for IgE class switching in a B-cell-intrinsic manner; NFIL3 binds the Iε promoter in vivo (ChIP) and is required for IL-4/LPS-induced germline epsilon (GLε) transcript production; NFIL3 expression in NFIL3-deficient B cells restores GLε transcription.","method":"Nfil3-/- mice, B-cell chimeras, chromatin immunoprecipitation, rescue experiments, cycloheximide GLε induction","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP in vivo binding, cell-intrinsic chimera, rescue experiment, single lab with multiple methods","pmids":["20080759"],"is_preprint":false},{"year":2010,"finding":"E4BP4 represses FGF21 transcription by binding a D-box element in the distal Fgf21 promoter; this repression is insulin-responsive via AKT-mediated induction of E4BP4. E4BP4 knockdown augments Fgf21 oscillation amplitude and overexpression represses FGF21 secretion from primary hepatocytes.","method":"ChIP, luciferase reporter assay, siRNA knockdown, overexpression in hepatocytes, D-box mutagenesis","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP, reporter with mutagenesis, primary hepatocyte functional assay, single lab with multiple orthogonal methods","pmids":["20851878"],"is_preprint":false},{"year":2011,"finding":"NFIL3/E4BP4 is essential for CD8α+ conventional dendritic cell development; Nfil3-/- mice specifically lack CD8α+ cDCs but retain CD8α- cDCs and pDCs. NFIL3 regulates CD8α+ cDC development partly through Batf3 expression; loss of NFIL3 impairs cross-priming of CD8+ T cells and IL-12 production after TLR3 stimulation.","method":"Nfil3-/- mice, bone marrow reconstitution, Flt3L cultures, T cell cross-priming assay, cytokine production assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Nfil3-/- mouse with multiple functional readouts and upstream Batf3 regulatory link, single lab","pmids":["21474667"],"is_preprint":false},{"year":2011,"finding":"NFIL3 is a negative regulator of IL-12 p40 (Il12b) transcription in macrophages; NFIL3 binds the Il12b promoter (confirmed by ChIP); NFIL3 is induced by IL-10/STAT3 signaling and its repression of Il12b does not require IL-10 but requires a C-terminal minimal repression domain.","method":"ChIP, luciferase reporter with BAC-GFP reporter line, shRNA knockdown, Nfil3-/- mice","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP in vivo, loss-of-function in macrophages with multiple reporters and KO mice, domain-deletion repression analysis, single lab","pmids":["21383239"],"is_preprint":false},{"year":2011,"finding":"A single NFIL3-binding site 10 kb upstream of Il12b is required for IL-10/STAT3-mediated repression of IL-12p40; NFIL3 binds this enhancer site and myeloid cells lacking NFIL3 overproduce IL-12p40 and IL-12p70.","method":"Enhancer deletion, ChIP, site mutagenesis, Nfil3-/- myeloid cells","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP with mutagenesis of binding site and KO validation, single lab, multiple methods","pmids":["21566115"],"is_preprint":false},{"year":2011,"finding":"E4BP4 regulates IL-10 and IL-13 production in CD4+ T cells: enforced E4BP4 expression drives IL-10 and IL-13 production in Th1 cells; E4bp4-/- Th1 cells, Treg cells, and NKT cells show attenuated IL-10 and IL-13; E4bp4-/- Th2 cells show impaired IL-10 (but not IL-13) production.","method":"Nfil3-/- mice, retroviral overexpression, cytokine ELISA and intracellular staining","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function in multiple T cell subsets, single lab with multiple methods","pmids":["21460847"],"is_preprint":false},{"year":2011,"finding":"NFIL3 directly binds and negatively regulates the Il13 gene in Th2 cells; NFIL3 deficiency increases IL-13 and IL-5 but decreases IL-4 production in a T-cell-intrinsic manner.","method":"ChIP, retroviral NFIL3 expression, Nfil3-/- Th2 cell cytokine analysis","journal":"EMBO Journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrates direct Il13 binding, gain- and loss-of-function, T-cell intrinsic transfer, single lab","pmids":["21499227"],"is_preprint":false},{"year":2011,"finding":"DBP (positive D-box regulator) knockdown shortens the circadian period of Per1/Per2 reporters in fibroblasts, while E4BP4 (negative D-box regulator) knockdown has the opposite effect; overexpression produces reciprocal phenotypes, demonstrating that D-box regulators including E4BP4 determine circadian period length.","method":"siRNA knockdown, cDNA overexpression, bioluminescent reporter assay in Rat-1 fibroblasts","journal":"FEBS Letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — cell-based oscillator assay with bidirectional perturbation, single lab","pmids":["21635892"],"is_preprint":false},{"year":2013,"finding":"E4BP4 represses Fgf21 via recruitment of histone methyltransferase G9a, which catalyzes H3K9me2 at the Fgf21 promoter; E4BP4 physically interacts with G9a; G9a SET-domain deletion abolishes repression; acute hepatic G9a knockdown de-represses Fgf21 during refeeding.","method":"Co-immunoprecipitation, G9a inhibitor (BIX01294), H3K9me2 ChIP, overexpression, shRNA knockdown, adenoviral G9a depletion in vivo","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP, catalytic mutant, histone ChIP, and in vivo rescue, multiple orthogonal methods, single lab","pmids":["23283977"],"is_preprint":false},{"year":2013,"finding":"Nfil3 is required only early during NK cell development (at or before the NK progenitor stage); specific deletion in mature peripheral NK cells or immature BM NK cells has no effect on lineage maintenance; viral signals (Ly49H engagement, proinflammatory cytokines) can bypass Nfil3 to generate Ly49H+ NK cells in Nfil3-/- mice infected with MCMV.","method":"Conditional Nfil3 deletion (immature/mature NK stages), MCMV infection model, memory NK cell persistence assay","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — stage-specific conditional KO with multiple functional assays, replicated across conditions, single lab","pmids":["24277151"],"is_preprint":false},{"year":2013,"finding":"Nfil3 is required for glucocorticoid-induced apoptosis (GICD) in T cells; a glucocorticoid response element 5 kb upstream of the Nfil3 promoter is bound by GR (confirmed by ChIP); Nfil3 siRNA knockdown to 20% of normal abrogates GICD in CTLL-2 T cells.","method":"Microarray, ChIP, siRNA knockdown, apoptosis assay","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms GRE binding, siRNA functional assay, single lab","pmids":["23425966"],"is_preprint":false},{"year":2014,"finding":"E4BP4 binds directly to the regulatory regions of both Eomes and Id2 genes and promotes their transcription; E4BP4 is required at the CLP stage for NK lineage commitment; forced Eomes and Id2 expression can rescue NK production from E4bp4-/- progenitors.","method":"ChIP, progenitor rescue experiments with retroviral Eomes/Id2, CLP-stage conditional analysis","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP confirms direct binding, genetic epistasis by rescue, stage-specific analysis, single lab with multiple methods","pmids":["24663216"],"is_preprint":false},{"year":2014,"finding":"NFIL3 directs differentiation of a committed ILC precursor (αLP/CXCR6+ cells) that gives rise to all ILC lineages; NFIL3 was required in the CLP and directly regulates TOX expression to govern ILC development.","method":"Nfil3-/- mice, clonal differentiation assays, conditional knockouts, ChIP for TOX regulation","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clonal differentiation experiments, direct TOX regulation by ChIP, cell-intrinsic analysis, single lab","pmids":["25310240"],"is_preprint":false},{"year":2014,"finding":"Nfil3 is required for formation of Eomes-expressing NK cells (conventional medullary and thymic NK), but TRAIL+ Eomes- NK cells develop independently of Nfil3; restoration of Eomes in Nfil3-/- progenitors rescues conventional NK development.","method":"Nfil3-/- mice, retroviral Eomes rescue, flow cytometry phenotyping","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Nfil3-/- phenotyping with Eomes rescue, single lab","pmids":["24532575"],"is_preprint":false},{"year":2014,"finding":"NFIL3 exerts its function via direct Id2 regulation in the CHILP; ectopic Id2 expression in Nfil3-null precursors rescues ILC lineage development in vivo; IL-7 controls Nfil3 expression in lymphoid progenitors.","method":"Conditional Nfil3 ablation, Id2 rescue experiments, ChIP for Id2 regulation","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct Id2 regulation by ChIP, in vivo rescue, cell-intrinsic conditional KO, single lab","pmids":["25801035"],"is_preprint":false},{"year":2014,"finding":"NFIL3 is a microbiota-dependent, IL-10-independent regulator of IL-12p40 in the colon; Nfil3-/- mice develop spontaneous colitis that is abrogated by additional Il12b deletion and requires microbiota (germ-free Nfil3-/- mice are protected).","method":"Double-KO mice (Nfil3-/-/Il12b-/-), germ-free Nfil3-/- mice, CD4+ T cell adoptive transfer","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double KO, germ-free experiment, adoptive transfer, multiple orthogonal in vivo approaches","pmids":["24442434"],"is_preprint":false},{"year":2015,"finding":"IL-27 induces NFIL3 in T cells; NFIL3 promotes permissive chromatin remodeling at the Tim-3 locus and induces Tim-3 and IL-10 co-expression; IL-27/NFIL3 axis drives T cell dysfunction and reduced effector function in a NFIL3-dependent manner.","method":"IL-27R-/- mice, NFIL3 overexpression/knockdown, chromatin accessibility/histone modification assays, Tim-3 expression analysis","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — IL-27R-/- mouse in vivo phenotype, NFIL3 gain/loss-of-function, chromatin assay, single lab with multiple methods","pmids":["25614966"],"is_preprint":false},{"year":2015,"finding":"PDK1 connects IL-15 signaling to E4BP4 induction in NK cells via mTOR; PDK1-deficient NK cells show reduced mTOR activation, E4BP4 induction, and CD122 expression; ectopic E4BP4 expression or mTOR activation partially rescues NK development from PDK1-deficient progenitors, defining a PDK1-mTOR-E4BP4-CD122 positive feedback loop.","method":"Conditional PDK1 KO, retroviral E4BP4 overexpression, mTOR activation rescue, CD122 expression analysis","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with gain-of-function rescue, pathway epistasis, single lab with multiple methods","pmids":["25624444"],"is_preprint":false},{"year":2016,"finding":"E4BP4 promotes survival of IL-5-stimulated eosinophils against glucocorticoid-induced apoptosis; IL-5 and dexamethasone synergistically induce NFIL3; siRNA-mediated NFIL3 inhibition or Pim-1 kinase blockade abrogates the IL-5 protective effect, identifying crosstalk between IL-5 anti-apoptotic pathways and GR transactivation via NFIL3.","method":"siRNA knockdown, Pim-1 inhibitor, apoptosis assays, proteomic analysis","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — siRNA functional assay with pharmacological inhibitor, single lab","pmids":["26880402"],"is_preprint":false},{"year":2016,"finding":"E4BP4 is an insulin-induced stabilizer of nuclear SREBP-1c in hepatocytes; E4BP4 interacts with nuclear SREBP-1c to preserve its acetylation and protect it from ubiquitination-dependent degradation, thereby promoting SREBP-1c-mediated de novo lipogenesis.","method":"Co-immunoprecipitation, ubiquitination assay, acetylation assay, adenoviral shRNA liver depletion, E4bp4-/- hepatocytes","journal":"Journal of Lipid Research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Co-IP, ubiquitination/acetylation biochemistry, in vivo liver depletion, single lab with multiple orthogonal methods","pmids":["27252523"],"is_preprint":false},{"year":2017,"finding":"Smad3 directly suppresses E4BP4/NFIL3 transcription; Smad3 deletion enhances E4BP4-mediated NK cell differentiation and anti-tumor effector functions; Smad3 suppresses IFN-γ expression via E4BP4 in a T-bet-independent manner.","method":"Smad3-/- bone marrow NK differentiation, ChIP/transcription assays for E4BP4 as Smad3 target, IFN-γ assays, Smad3 inhibitor (SIS3) in vivo","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct transcriptional target ChIP, KO ex vivo differentiation, in vivo tumor model, single lab","pmids":["28262747"],"is_preprint":false},{"year":2017,"finding":"The intestinal microbiota regulates NFIL3 transcription in intestinal epithelial cells (IECs) through group 3 ILCs, STAT3, and the epithelial circadian clock; NFIL3 controls a circadian lipid metabolic program in IECs and regulates lipid absorption and export.","method":"Nfil3-/- mice, germ-free mice, ILC3-depleted mice, STAT3 pathway analysis, lipid absorption assays, circadian gene expression","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (germ-free, ILC3 depletion, Nfil3-/-), STAT3 pathway, functional lipid assays, published in high-tier journal","pmids":["28860383"],"is_preprint":false},{"year":2017,"finding":"NFIL3 represses hepatic gluconeogenesis by competing with CREB for binding at cAMP response elements in gluconeogenic gene promoters (e.g., PEPCK, G6Pase); this requires the NFIL3 bZIP DNA-binding domain; hepatic NFIL3 is decreased in insulin-resistant mice and its ectopic expression in insulin-resistant livers ameliorates hyperglycemia.","method":"ChIP, luciferase reporter assay, adenoviral hepatic NFIL3 delivery in ob/ob and HFD mice, primary hepatocyte glucose production assays","journal":"Metabolism","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP, reporter with binding competition, in vivo rescue of hyperglycemia, single lab with multiple methods","pmids":["29132537"],"is_preprint":false},{"year":2018,"finding":"E4BP4 regulates carboxylesterase 2 (Ces2) enzymes by antagonizing Rev-erbα transrepression; E4BP4 directly interacts with Rev-erbα (Co-IP); Rev-erbα represses Ces2b by binding its promoter (-767 to -754 bp); E4BP4 loss down-regulates Ces2 genes and impairs CPT-11 pharmacokinetics.","method":"Co-immunoprecipitation, luciferase reporter, EMSA, E4bp4-/- mice, pharmacokinetic studies","journal":"Biochemical Pharmacology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Co-IP, EMSA, reporter with site identification, in vivo pharmacokinetic validation, single lab","pmids":["29653076"],"is_preprint":false},{"year":2018,"finding":"E4BP4 inhibits Tfh cell differentiation by recruiting repressive epigenetic modifiers HDAC1 and EZH2 to repress Bcl6 transcription; phosphorylation-site mutants of E4BP4 show limited capability to inhibit Tfh differentiation; E4BP4 phosphorylation is impaired in SLE patients.","method":"Conditional E4bp4 KO and knockin T cells, ChIP for HDAC1/EZH2 recruitment, phosphorylation mutant analysis, SLE patient samples","journal":"Journal of Clinical Investigation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP for epigenetic modifier recruitment, conditional KO/KI, phospho-mutant, single lab with multiple methods","pmids":["32191636"],"is_preprint":false},{"year":2018,"finding":"E4BP4 interacts with G9a to form a multi-molecular complex on the SOSTDC1 promoter in thyroid cancer cells, causing SOSTDC1 silencing through G9a-mediated histone methylation, which leads to deregulated hepcidin secretion and iron dysregulation promoting cancer proliferation.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, in vivo xenograft, luciferase assay","journal":"Cell Death & Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP with functional in vivo validation, single lab","pmids":["30250199"],"is_preprint":false},{"year":2019,"finding":"NFIL3 acts as a transcriptional activator of the PRNP promoter in lung adenocarcinoma cells, driving PrPc expression; NFIL3-induced cell migration and invasion requires PrPc and proceeds through JNK signaling-dependent lamellipodium formation.","method":"Luciferase reporter assay, ChIP, PrPc knockdown, JNK inhibitor, migration/invasion assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms NFIL3 binding to PRNP promoter, pathway epistasis with JNK inhibitor, single lab","pmids":["31477838"],"is_preprint":false},{"year":2019,"finding":"NFIL3 directly binds and negatively regulates Foxp3 expression in Treg cells; NFIL3 overexpression in Treg cells induces methylation at Foxp3 locus CpG regulatory sites, diminishing Foxp3 and other Treg signature genes, impairing immunosuppressive activity.","method":"ChIP, bisulfite sequencing, overexpression in Treg cells, in vitro and in vivo suppression assays","journal":"Experimental & Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrates direct Foxp3 binding, bisulfite sequencing shows methylation change, functional suppression assay, single lab","pmids":["31311918"],"is_preprint":false},{"year":2019,"finding":"An Nfil3-Zeb2-Id2 genetic circuit controls cDC1 progenitor development: Nfil3 is required for transition from Zeb2hi/Id2lo CDPs to Zeb2lo/Id2hi CDPs (earliest committed cDC1 progenitors), blocking E-protein activity to exclude pDC potential.","method":"Single-cell RNA sequencing, genetic epistasis (Nfil3, Zeb2, Id2 KO combinations)","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — scRNA-seq combined with genetic epistasis in multiple KO combinations, single lab","pmids":["31406377"],"is_preprint":false},{"year":2019,"finding":"E4bp4 negatively regulates Cyp3a11 expression and activity in liver, kidney, and intestine by directly binding the C-site (-1539/-1529 bp) in the Cyp3a11 promoter; E4bp4-/- mice show elevated Cyp3a11 activity and reduced systemic midazolam exposure.","method":"E4bp4-/- mice, luciferase reporter, EMSA, microsomal enzyme activity, pharmacokinetic studies","journal":"Biochemical Pharmacology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — EMSA defines binding site, reporter assay, KO in vivo pharmacokinetics, single lab with multiple methods","pmids":["30796914"],"is_preprint":false},{"year":2020,"finding":"PBX1 directly binds the Nfil3 promoter and upregulates NFIL3 expression to promote early NK cell development; knockout of the PBX1 binding site in the Nfil3 promoter reduces NK progenitor and NK cell numbers phenocopying Nfil3 KO; PBX1 residue N286 in the homeodomain is required for Nfil3 promoter binding.","method":"Conditional PBX1 KO, ChIP, CRISPR-mediated Nfil3 promoter binding-site KO, PBX1 homeodomain mutagenesis","journal":"FASEB Journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP, in vivo CRISPR binding-site KO phenotype, homeodomain mutagenesis, single lab with multiple methods","pmids":["32190943"],"is_preprint":false},{"year":2021,"finding":"REV-ERBα/β repress E4BP4 transcription in cardiomyocytes; loss of Rev-erbs causes E4BP4 induction; E4BP4 directly controls circadian Nampt expression and NAD+ production via distal cis-regulatory elements; this REV-ERB→E4BP4→NAMPT→NAD+ pathway is required for cardiac metabolic homeostasis and function.","method":"Cardiomyocyte-specific Rev-erb double KO mice, ChIP for E4BP4 binding to Nampt enhancers, NAD+ metabolite measurement, dilated cardiomyopathy phenotype analysis","journal":"Nature Cardiovascular Research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO, ChIP for direct target binding, metabolite measurement, in vivo cardiac phenotype, single lab with multiple methods","pmids":["35036997"],"is_preprint":false},{"year":2021,"finding":"mTORC1 primarily promotes E4BP4 expression to regulate early NK cell differentiation (iNK stage), while both mTORC1 and mTORC2 enhance T-bet expression; mTORC2 deficiency specifically impairs CD27-CD11b- early iNK cells.","method":"CD122-Cre and Ncr1-Cre mediated conditional KO of mTOR, Raptor, Rictor; flow cytometry; E4BP4 and T-bet expression analysis","journal":"Cell Death and Differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stage-specific conditional KO of two mTOR complexes, single lab with multiple genetic tools","pmids":["33462410"],"is_preprint":false},{"year":2021,"finding":"NFIL3 promotes transcription of REDD1 by binding to its promoter; REDD1 augments neutrophil autophagy and NET formation by inhibiting mTOR; NFIL3 silencing reduces inflammatory injury in acute gouty arthritis mice by inhibiting neutrophil autophagy and NET formation via the REDD1/mTOR pathway.","method":"ChIP/luciferase for REDD1 promoter binding, NFIL3 gain/loss-of-function in neutrophils, in vivo gout model with NFIL3 silencing, autophagy and NET assays","journal":"Frontiers in Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms REDD1 promoter binding, in vivo pathway validation, single lab","pmids":["34660620"],"is_preprint":false},{"year":2022,"finding":"NFIL3 directly suppresses NFKBIA transcription (confirmed by ChIP and luciferase reporter), thereby enhancing NF-κB signaling to promote TNBC cell proliferation and metastasis; NFIL3 also auto-represses its own transcription.","method":"ChIP, luciferase reporter assay, colony formation, migration, transwell assay, subcutaneous tumor model, tail-vein injection metastasis model","journal":"Journal of Experimental & Clinical Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter for NFKBIA, in vitro and in vivo functional validation, single lab","pmids":["35180863"],"is_preprint":false},{"year":2022,"finding":"E4BP4 inhibits the ERK1/2 signaling pathway in microglia by trans-repressing Mapk1/3 (genes encoding ERK1/2) via direct binding to D-box elements in their promoter regions, thereby restraining microglial activation; microglial E4bp4 deletion exacerbates delirium-associated cognitive decline.","method":"Microglial-specific E4bp4 KO, ChIP for Mapk1/3 D-box binding, scRNA-seq, ERK1/2 activation assays, cognitive behavioral tests","journal":"Advanced Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms direct Mapk1/3 promoter binding, cell-type-specific KO, single lab","pmids":["35713240"],"is_preprint":false},{"year":2023,"finding":"E4BP4 is modified by SUMOylation at five lysine residues; HFD feeding induces deSUMOylation of hepatic E4BP4; SUMOylated E4BP4 downregulates Fsp27 and lipid droplet formation, while deSUMOylated (active) E4BP4 enhances Fsp27 transactivation via CREBH interaction to promote liver steatosis.","method":"SUMOylation mutants, Co-IP for CREBH interaction, primary hepatocyte lipid assays, HFD E4bp4-LKO mice, Fsp27 overexpression rescue","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — SUMOylation site mutants, Co-IP, in vivo liver-specific KO, multiple orthogonal methods, single lab","pmids":["36508222"],"is_preprint":false},{"year":2024,"finding":"Hepatocyte E4BP4 interacts with and stabilizes YAP; E4BP4 induces OPN (osteopontin) via YAP to activate hepatic stellate cells and promote liver fibrosis; E4BP4 overexpression in hepatocytes activates HSCs in medium transfer experiments, and this is abrogated by OPN neutralization or depletion.","method":"Co-IP for E4BP4-YAP interaction, RNA-Seq, OPN antibody neutralization, shRNA Opn depletion, medium transfer HSC activation assay, hepatocyte-specific E4bp4 KO in NASH diet and CCl4 models","journal":"Advanced Science","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Co-IP, RNA-Seq, antibody neutralization, genetic rescue, multiple in vivo models, single lab","pmids":["39473081"],"is_preprint":false},{"year":2017,"finding":"hnRNP A1 binds a specific region of the Nfil3 5'-UTR IRES and regulates cap-independent, IRES-mediated translation of Nfil3 mRNA; hnRNP A1 knockdown abolishes Nfil3 protein oscillation without affecting mRNA oscillation, revealing a post-transcriptional layer of circadian Nfil3 regulation.","method":"IRES reporter assay, RNA pulldown, hnRNP A1 knockdown, circadian protein/mRNA tracking","journal":"Scientific Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IRES functional assay, RNA pulldown identifying binding protein, loss-of-function, single lab","pmids":["28220845"],"is_preprint":false},{"year":2018,"finding":"E4BP4 SUMOylation and phosphorylation modulate its function and NK cell development; a novel E4bp4 target gene is Notch1; abrogation of Notch signaling impedes NK cell production; complete absence of NK development from E4bp4-/- progenitors is fully rescued by short exposure to Notch peptide ligands.","method":"Post-translational modification mutants, Notch ChIP/reporter identification, Notch ligand rescue of NK progenitors, NK cell development assays","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PTM mutants with functional readout, Notch rescue experiment, single lab","pmids":["29311361"],"is_preprint":false},{"year":2020,"finding":"E4BP4 promotes hepatic lipid accumulation by suppressing AMPK activity through promotion of AMPKβ1 ubiquitination and degradation; hepatic E4bp4 induction by ER stress (tunicamycin, HFLMCD diet) is partially dependent on CHOP and requires an E-box in the E4bp4 promoter.","method":"E4bp4 liver-specific KO mice, AMPKβ1 ubiquitination assay, primary hepatocyte lipid assays, AMPKβ1 depletion rescue, promoter E-box mutation analysis","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay for AMPKβ1 degradation, liver-specific KO, rescue experiment, single lab","pmids":["32780887"],"is_preprint":false},{"year":2014,"finding":"E4BP4 directly represses SOSTDC1 expression in breast cancer cells; E4BP4 binding regions in the SOSTDC1 promoter were identified by deletion analysis; E4BP4 knockdown combined with demethylation treatment up-regulates SOSTDC1 and inhibits cell proliferation.","method":"Promoter deletion/reporter assay, E4BP4 knockdown, 5'-Aza-dC treatment, cell proliferation assay","journal":"Cellular Oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — promoter deletion only (no ChIP confirming direct binding), single lab","pmids":["25338303"],"is_preprint":false},{"year":2004,"finding":"PTH induces E4bp4 mRNA expression in osteoblasts primarily through cAMP-PKA signaling; PKA inhibitor H89 blocks PTH- and forskolin-induced E4bp4; PTH(3-34) (lacking cAMP activation) does not induce E4bp4; this pathway is confirmed in vivo.","method":"Pharmacological signaling dissection (H89, 8-Br-cAMP, PMA, ionomycin), PTH(3-34) mutant, in vivo PTH injection","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple signaling pathway probes with dominant-negative PTH analog, in vivo confirmation, single lab","pmids":["15087429"],"is_preprint":false},{"year":2014,"finding":"α1-adrenergic receptor signaling in osteoblasts upregulates Nfil3/E4BP4, which then binds to D-box elements in the Bmp4 promoter (confirmed by ChIP) to repress Bmp4 expression in a circadian manner.","method":"ChIP for E4BP4 binding to Bmp4 promoter, α1-AR agonist treatment, gain/loss-of-function for Nfil3, circadian expression analysis","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms direct D-box binding, functional gain/loss of function, single lab","pmids":["24794868"],"is_preprint":false},{"year":2019,"finding":"NFIL3 promotes transcription of REDD1 (binding its promoter) and regulates ferroptosis and inflammation in sepsis-associated acute kidney injury; NFIL3 knockdown attenuates renal tubular ferroptosis and inflammation by downregulating ACSL4.","method":"NFIL3 knockdown in vitro and in vivo SA-AKI models, ACSL4 expression analysis, ferroptosis markers","journal":"Cell Death Discovery","confidence":"Low","confidence_rationale":"Tier 3 / Weak — loss-of-function with correlative ACSL4 analysis, no direct ChIP for ACSL4 promoter shown in abstract, single lab","pmids":["39097582"],"is_preprint":false},{"year":2023,"finding":"H2S sulfhydrylates NFIL3 protein, which reduces NFIL3 binding to the MEST promoter (confirmed by ChIP-qPCR and luciferase assay) and thereby suppresses MEST transcription, inhibiting low-shear-stress-induced endothelial-mesenchymal transition and atherosclerosis.","method":"ChIP-qPCR, luciferase reporter assay, NFIL3 knockdown, H2S donor treatment, sulfhydrylation assay","journal":"Nitric Oxide","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP-qPCR and reporter with PTM (sulfhydrylation), loss-of-function, single lab","pmids":["38049061"],"is_preprint":false}],"current_model":"NFIL3/E4BP4 is a bZIP transcription factor that acts predominantly as a transcriptional repressor (via a C-terminal 65-aa repression domain that recruits the co-repressor Dr1, and via epigenetic co-repressors G9a and HDAC1/EZH2) but can also activate transcription depending on context; it is regulated post-translationally by CK1ε-mediated phosphorylation (leading to proteasomal degradation), SUMOylation, and sulfhydrylation, and at the translational level by hnRNP A1-dependent IRES activity; in the circadian clock it oscillates in antiphase to PAR proteins (DBP/HLF/TEF), competing for the same D-box sites to repress circadian target genes including Per2, Fgf21, Nampt, and Bmp4; in immunity it is an essential cell-intrinsic transcription factor downstream of IL-15/PDK1/mTORC1 that directly activates Id2, Eomes, TOX, and Notch1 to drive commitment and development of NK cells and all ILC lineages, while also regulating IgE class switching in B cells, CD8α+ cDC development via Batf3, and T cell effector function via Tim-3/IL-10 and Tfh suppression via Bcl6/EZH2; in metabolism it suppresses hepatic gluconeogenesis by competing with CREB at CRE sites, promotes de novo lipogenesis by stabilizing SREBP-1c acetylation, and regulates lipid droplet biogenesis through Fsp27 transactivation via CREBH after HFD-induced deSUMOylation."},"narrative":{"mechanistic_narrative":"NFIL3 (E4BP4) is a basic leucine-zipper transcription factor that integrates cytokine and metabolic signals to control immune cell development, circadian gene expression, and hepatic lipid and glucose metabolism, acting predominantly as a repressor but also as a context-dependent activator [PMID:11316793, PMID:19749763, PMID:19995955, PMID:24663216]. Its repressor function is conferred by a discrete C-terminal 65-amino-acid domain that recruits the TBP-binding co-repressor Dr1, and is amplified by epigenetic co-repressors including the histone methyltransferase G9a and the HDAC1/EZH2 machinery [PMID:8127655, PMID:8836190, PMID:23283977, PMID:32191636]. In the circadian clock NFIL3 oscillates in antiphase to the PAR factors (DBP/HLF/TEF), competing for shared D-box sites to repress targets such as Per2, Fgf21, Nampt, and Bmp4, thereby setting period and amplitude [PMID:11316793, PMID:17182630, PMID:20851878, PMID:35036997, PMID:24794868]. In immunity NFIL3 is an essential cell-intrinsic factor acting downstream of IL-15 via a PDK1–mTORC1 axis to drive NK cell and innate lymphoid cell commitment through direct transactivation of Id2, Eomes, TOX, and Notch1, and it independently directs CD8α+/cDC1 dendritic cell development through Batf3 and a Zeb2–Id2 circuit [PMID:19749763, PMID:19995955, PMID:24663216, PMID:25310240, PMID:25801035, PMID:25624444, PMID:31406377, PMID:29311361]. Beyond lineage specification NFIL3 tunes effector function by repressing Il12b in myeloid cells, repressing Bcl6 to limit Tfh differentiation, repressing Foxp3 in Tregs, and driving Tim-3/IL-10 co-expression downstream of IL-27 [PMID:21383239, PMID:21566115, PMID:25614966, PMID:32191636, PMID:31311918]. In the liver NFIL3 suppresses gluconeogenesis by competing with CREB at CRE sites, while promoting de novo lipogenesis by stabilizing nuclear SREBP-1c and, after HFD-induced deSUMOylation, transactivating the lipid-droplet gene Fsp27 via CREBH [PMID:27252523, PMID:29132537, PMID:36508222]. NFIL3 protein abundance and activity are set post-translationally by CK1ε-mediated Ser182 phosphorylation that triggers proteasomal degradation, by SUMOylation, by sulfhydrylation, and translationally by hnRNP A1-dependent IRES activity [PMID:15182670, PMID:36508222, PMID:28220845, PMID:38049061].","teleology":[{"year":1994,"claim":"Established that NFIL3 acts as a transcriptional repressor through a defined, transferable domain rather than as a generic DNA binder, localizing its repressive function molecularly.","evidence":"deletion mapping, GAL4 fusion reporters, and charge-mutagenesis of a 65-aa C-terminal domain","pmids":["8127655"],"confidence":"High","gaps":["The general transcription machinery contact was inferred, not identified","Did not establish the in vivo target genes repressed via this domain"]},{"year":1995,"claim":"Showed NFIL3 can also act as a sequence-specific activator, demonstrating its dual transcriptional capacity depends on promoter context.","evidence":"DNase I footprinting, EMSA, and cotransfection reporter assays on the IL-3 promoter","pmids":["7565758"],"confidence":"High","gaps":["Mechanism switching between activation and repression unresolved","No co-factor identified for activation"]},{"year":1996,"claim":"Identified the co-repressor Dr1 as the molecular mediator of NFIL3 repression, connecting the repression domain to the basal transcription machinery.","evidence":"in vitro protein binding with repression-defective mutant correlation","pmids":["8836190"],"confidence":"Medium","gaps":["Single in vitro binding method without reciprocal validation","Not shown on an endogenous target gene"]},{"year":1997,"claim":"Placed NFIL3 downstream of cytokine survival signaling, showing it transduces IL-3 anti-apoptotic signals in lymphoid progenitors.","evidence":"Northern blot, cytokine-withdrawal survival assay, and cDNA overexpression in pro-B cells","pmids":["9122243"],"confidence":"High","gaps":["Pro-survival target genes not defined","Relationship between repressor activity and survival function unclear"]},{"year":2001,"claim":"Embedded NFIL3 in the core circadian oscillator as the negative D-box regulator opposing PAR activators through DNA-site competition.","evidence":"in situ hybridization, luciferase reporters, EMSA, and Cry-knockout mouse analysis in SCN and liver","pmids":["11316793"],"confidence":"High","gaps":["Direct clock target genes not yet enumerated","Mechanism placing E4bp4 downstream of CRY not fully resolved"]},{"year":2004,"claim":"Defined the principal post-translational control of NFIL3 stability, showing CK1ε phosphorylation at Ser182 drives proteasomal degradation and limits repression.","evidence":"co-IP, in vitro kinase assay, proteasome inhibition, site-directed mutagenesis, and reporter assays","pmids":["15182670"],"confidence":"High","gaps":["Phosphatase counteracting CK1ε not identified","Whether degradation is gated by circadian or signaling inputs unresolved"]},{"year":2006,"claim":"Provided direct in vivo evidence that NFIL3 represses a clock gene by binding the Per2 promoter B-site, mechanizing its circadian role.","evidence":"siRNA knockdown, reporter mutagenesis, and ChIP correlating peak binding with trough Per2 mRNA","pmids":["17182630"],"confidence":"High","gaps":["Co-repressors recruited at the Per2 B-site not identified at this stage"]},{"year":2009,"claim":"Identified NFIL3 as a non-redundant, cell-intrinsic master regulator of NK cell development acting downstream of IL-15 and upstream of Id2.","evidence":"two independent Nfil3-/- mouse lines, bone marrow chimeras, and progenitor overexpression","pmids":["19749763","19995955"],"confidence":"High","gaps":["Direct vs indirect regulation of Id2 not yet shown by ChIP","Developmental stage of NFIL3 requirement undefined"]},{"year":2011,"claim":"Broadened NFIL3's immune role beyond NK cells to dendritic cell development and cytokine programming, including IL-12p40 repression and IL-10/IL-13 control.","evidence":"Nfil3-/- mice, ChIP on Il12b/Il13 loci, enhancer mutagenesis, and gain/loss-of-function across DC and T cell subsets","pmids":["21474667","21383239","21566115","21460847","21499227"],"confidence":"High","gaps":["Whether the same repression machinery operates across all loci unclear","Direct vs Batf3-mediated DC effects not fully separated"]},{"year":2013,"claim":"Mechanized NFIL3 repression epigenetically by showing direct recruitment of G9a to deposit H3K9me2 at the Fgf21 promoter.","evidence":"co-IP, G9a catalytic-mutant and inhibitor, H3K9me2 ChIP, and in vivo G9a depletion","pmids":["23283977"],"confidence":"High","gaps":["Generality of G9a recruitment to other NFIL3 targets not established here"]},{"year":2014,"claim":"Resolved the transcriptional circuitry of NFIL3-driven lymphopoiesis, showing direct activation of Eomes, Id2, and TOX at the common lymphoid/ILC precursor stage.","evidence":"ChIP, retroviral Eomes/Id2 rescue of Nfil3-/- progenitors, and stage-specific conditional analysis","pmids":["24663216","25310240","24277151","24532575"],"confidence":"High","gaps":["Why NFIL3 is required only early/transiently in NK lineage not fully explained","Eomes-independent TRAIL+ NK pathway mechanism unclear"]},{"year":2015,"claim":"Connected upstream signaling to NFIL3 induction, defining a PDK1–mTOR–E4BP4–CD122 feedback loop downstream of IL-15 and an IL-27–NFIL3–Tim-3/IL-10 dysfunction axis.","evidence":"conditional PDK1 KO with mTOR/E4BP4 rescue, and IL-27R-/- mice with chromatin accessibility assays","pmids":["25624444","25614966"],"confidence":"High","gaps":["Direct mTORC1 target driving E4bp4 transcription not identified","How IL-27 vs IL-15 inputs are integrated at the Nfil3 locus unclear"]},{"year":2016,"claim":"Established NFIL3 as a hepatic metabolic regulator that stabilizes nuclear SREBP-1c to promote de novo lipogenesis.","evidence":"co-IP, ubiquitination/acetylation assays, adenoviral liver depletion, and E4bp4-/- hepatocytes","pmids":["27252523"],"confidence":"High","gaps":["How NFIL3 preserves SREBP-1c acetylation mechanistically not resolved"]},{"year":2017,"claim":"Linked NFIL3 to systemic and intestinal metabolic control, integrating microbiota, ILC3, and circadian inputs to regulate epithelial lipid handling.","evidence":"germ-free, ILC3-depleted, and Nfil3-/- mice with STAT3 pathway analysis and lipid absorption assays; plus IRES translational regulation","pmids":["28860383","28220845"],"confidence":"High","gaps":["Direct epithelial lipid-gene targets of NFIL3 incompletely mapped","How circadian and microbial signals are integrated at the locus unresolved"]},{"year":2017,"claim":"Showed NFIL3 represses gluconeogenesis and is itself a Smad3 target, expanding its metabolic and developmental regulatory network.","evidence":"ChIP, reporter competition with CREB, in vivo hepatic rescue of hyperglycemia, and Smad3-/- NK differentiation","pmids":["29132537","28262747"],"confidence":"High","gaps":["Whether CREB competition uses the same DNA element in all gluconeogenic promoters unclear"]},{"year":2018,"claim":"Mechanized NFIL3 repression in adaptive immunity through HDAC1/EZH2 recruitment at Bcl6, and tied its activity to phosphorylation status relevant to autoimmunity.","evidence":"conditional KO/KI T cells, ChIP for HDAC1/EZH2 recruitment, phospho-mutants, and SLE patient samples","pmids":["32191636","29311361"],"confidence":"High","gaps":["Kinase/phosphatase controlling the relevant phosphosite in T cells not pinpointed","Notch1 as direct target needs further validation beyond rescue"]},{"year":2019,"claim":"Defined the upstream and downstream architecture of NFIL3-dependent cDC1 development and added drug-metabolism and Treg targets to its repertoire.","evidence":"scRNA-seq and genetic epistasis (Nfil3/Zeb2/Id2), PBX1 ChIP and promoter binding-site CRISPR KO, and Cyp3a11/Foxp3 ChIP with KO pharmacokinetics","pmids":["31406377","32190943","30796914","31311918"],"confidence":"High","gaps":["Integration of PBX1 and cytokine inputs at the Nfil3 promoter unresolved","Direct vs methylation-mediated Foxp3 repression mechanism incompletely separated"]},{"year":2021,"claim":"Embedded NFIL3 in a REV-ERB→E4BP4→NAMPT→NAD+ circadian metabolic pathway controlling cardiac homeostasis.","evidence":"cardiomyocyte-specific Rev-erb double KO, ChIP at Nampt enhancers, and NAD+ metabolite measurement","pmids":["35036997"],"confidence":"High","gaps":["Tissue specificity of the NAMPT regulation not generalized"]},{"year":2023,"claim":"Revealed SUMOylation as a metabolic switch and a CREBH partnership controlling lipid-droplet gene Fsp27, refining NFIL3's pro-steatotic role.","evidence":"SUMOylation-site mutants, co-IP for CREBH, HFD liver-specific KO, and Fsp27 rescue","pmids":["36508222","39473081"],"confidence":"High","gaps":["The deSUMOylating enzyme acting on E4BP4 after HFD not identified","How SUMOylation status reprograms target selection mechanistically unclear"]},{"year":null,"claim":"How a single bZIP factor selects between repression (Dr1/G9a/HDAC1/EZH2) and activation, and how its many post-translational modifications (phosphorylation, SUMOylation, sulfhydrylation) and translational IRES control are coordinately decoded to specify distinct immune, circadian, and metabolic outputs, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking PTM state to target-gene choice","No structural basis for activator vs repressor mode","Cross-talk between circadian, immune, and metabolic programs in vivo not integrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,9,29,40,52]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,9,15,40,47]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[37,54,55]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[12,14]}],"pathway":[{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[9,15,19,49,61]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[17,18,20,21,30,42]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,3,26,42]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[37,40,49,54,58]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[29,30,32,46]}],"complexes":[],"partners":["DR1","G9A","HDAC1","EZH2","CK1Ε","SREBP-1C","PER2","CREBH"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q16649","full_name":"Nuclear factor interleukin-3-regulated protein","aliases":["E4 promoter-binding protein 4","Interleukin-3 promoter transcriptional activator","Interleukin-3-binding protein 1","Transcriptional activator NF-IL3A"],"length_aa":462,"mass_kda":51.5,"function":"Acts as a transcriptional regulator that recognizes and binds to the sequence 5'-[GA]TTA[CT]GTAA[CT]-3', a sequence present in many cellular and viral promoters. Represses transcription from promoters with activating transcription factor (ATF) sites. Represses promoter activity in osteoblasts (By similarity). Represses transcriptional activity of PER1 (By similarity). Represses transcriptional activity of PER2 via the B-site on the promoter (By similarity). Activates transcription from the interleukin-3 promoter in T-cells. Competes for the same consensus-binding site with PAR DNA-binding factors (DBP, HLF and TEF) (By similarity). Component of the circadian clock that acts as a negative regulator for the circadian expression of PER2 oscillation in the cell-autonomous core clock (By similarity). Protects pro-B cells from programmed cell death (By similarity). Represses the transcription of CYP2A5 (By similarity). Positively regulates the expression and activity of CES2 by antagonizing the repressive action of NR1D1 on CES2 (By similarity). Required for the development of natural killer cell precursors (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q16649/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NFIL3","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NFIL3","total_profiled":1310},"omim":[{"mim_id":"618795","title":"JUVENILE ARTHRITIS; JUVAR","url":"https://www.omim.org/entry/618795"},{"mim_id":"606200","title":"BASIC HELIX-LOOP-HELIX FAMILY, MEMBER E41; BHLHE41","url":"https://www.omim.org/entry/606200"},{"mim_id":"605802","title":"ZINC FINGER E BOX-BINDING HOMEOBOX 2; ZEB2","url":"https://www.omim.org/entry/605802"},{"mim_id":"605327","title":"NUCLEAR FACTOR, INTERLEUKIN 3-REGULATED; NFIL3","url":"https://www.omim.org/entry/605327"},{"mim_id":"604256","title":"BASIC HELIX-LOOP-HELIX FAMILY, MEMBER E40; BHLHE40","url":"https://www.omim.org/entry/604256"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear bodies","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NFIL3"},"hgnc":{"alias_symbol":["E4BP4","NFIL3A","NF-IL3A"],"prev_symbol":["IL3BP1"]},"alphafold":{"accession":"Q16649","domains":[{"cath_id":"1.10.287","chopping":"73-154","consensus_level":"medium","plddt":93.1076,"start":73,"end":154}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16649","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q16649-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q16649-F1-predicted_aligned_error_v6.png","plddt_mean":57.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NFIL3","jax_strain_url":"https://www.jax.org/strain/search?query=NFIL3"},"sequence":{"accession":"Q16649","fasta_url":"https://rest.uniprot.org/uniprotkb/Q16649.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q16649/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q16649"}},"corpus_meta":[{"pmid":"19749763","id":"PMC_19749763","title":"The basic leucine zipper transcription factor E4BP4 is essential for natural killer cell development.","date":"2009","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/19749763","citation_count":364,"is_preprint":false},{"pmid":"28860383","id":"PMC_28860383","title":"The intestinal microbiota regulates body composition through NFIL3 and the circadian clock.","date":"2017","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/28860383","citation_count":357,"is_preprint":false},{"pmid":"11316793","id":"PMC_11316793","title":"Antagonistic role of E4BP4 and PAR proteins in the circadian oscillatory mechanism.","date":"2001","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/11316793","citation_count":332,"is_preprint":false},{"pmid":"19995955","id":"PMC_19995955","title":"Nfil3/E4bp4 is required for the development and maturation of NK cells in vivo.","date":"2009","source":"The Journal of experimental 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Part A, Molecular & integrative physiology","url":"https://pubmed.ncbi.nlm.nih.gov/17996471","citation_count":17,"is_preprint":false},{"pmid":"24280221","id":"PMC_24280221","title":"Neuroprotective role of the basic leucine zipper transcription factor NFIL3 in models of amyotrophic lateral sclerosis.","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24280221","citation_count":17,"is_preprint":false},{"pmid":"36508222","id":"PMC_36508222","title":"High-Fat Diet-Induced DeSUMOylation of E4BP4 Promotes Lipid Droplet Biogenesis and Liver Steatosis in Mice.","date":"2023","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/36508222","citation_count":16,"is_preprint":false},{"pmid":"30796914","id":"PMC_30796914","title":"The transcription factor E4bp4 regulates the expression and activity of Cyp3a11 in mice.","date":"2019","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/30796914","citation_count":15,"is_preprint":false},{"pmid":"29856483","id":"PMC_29856483","title":"A minireview of E4BP4/NFIL3 in heart failure.","date":"2018","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/29856483","citation_count":13,"is_preprint":false},{"pmid":"28416324","id":"PMC_28416324","title":"E4BP4 mediates glucocorticoid-regulated adipogenesis through COX2.","date":"2017","source":"Molecular and cellular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/28416324","citation_count":12,"is_preprint":false},{"pmid":"35777910","id":"PMC_35777910","title":"NFIL3 deficiency alleviates EAE through regulating different immune cell subsets.","date":"2021","source":"Journal of advanced research","url":"https://pubmed.ncbi.nlm.nih.gov/35777910","citation_count":12,"is_preprint":false},{"pmid":"36403704","id":"PMC_36403704","title":"Nuclear factor interleukin 3 (NFIL3) participates in regulation of the NF-κB-mediated inflammation and antioxidant system in Litopenaeus vannamei under ammonia-N stress.","date":"2022","source":"Fish & shellfish immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36403704","citation_count":12,"is_preprint":false},{"pmid":"38049061","id":"PMC_38049061","title":"Hydrogen sulfide attenuates atherosclerosis induced by low shear stress by sulfhydrylating endothelium NFIL3 to restrain MEST mediated endothelial mesenchymal transformation.","date":"2023","source":"Nitric oxide : biology and chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38049061","citation_count":12,"is_preprint":false},{"pmid":"28506725","id":"PMC_28506725","title":"The first invertebrate NFIL3 transcription factor with role in immune defense identified from the Hong Kong oyster, Crassostrea hongkongensis.","date":"2017","source":"Developmental and comparative immunology","url":"https://pubmed.ncbi.nlm.nih.gov/28506725","citation_count":12,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48718,"output_tokens":14970,"usd":0.185352,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":27291,"output_tokens":5782,"usd":0.140503,"stage2_stop_reason":"end_turn"},"total_usd":0.325855,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1994,\n      \"finding\": \"E4BP4 transcriptional repression was mapped to a minimal 65-amino-acid domain near the C-terminus; a charge-configuration mutation in this domain abolished repressor activity. The mechanism involves interaction with components of the general transcription machinery rather than resembling known Krüppel/Engrailed repression domains.\",\n      \"method\": \"Deletion mapping, GAL4 fusion reporter assays, mutagenesis\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro transcription repression assay with mutagenesis, heterologous domain transfer, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"8127655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"NF-IL3A (NFIL3) binds the IL-3 promoter footprint A region (TAATTACGTCTG; minimal site ATTACG) and acts as a transcriptional activator of the IL-3 promoter in resting T cells; the binding site is required for transactivation.\",\n      \"method\": \"DNase I footprinting, gel shift assay, cotransfection reporter assay\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro DNA binding defined by footprinting and EMSA, functional validation by cotransfection with binding-site mutagenesis, single lab\",\n      \"pmids\": [\"7565758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"E4BP4 protein produced in Sf9 insect cells is phosphorylated, and this phosphorylation enhances its DNA-binding activity compared with bacterially produced (unphosphorylated) protein.\",\n      \"method\": \"Baculovirus expression, gel shift assay, post-translational modification analysis\",\n      \"journal\": \"Biochimica et Biophysica Acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — comparative binding assay with differently expressed proteins, single lab, single method\",\n      \"pmids\": [\"8547328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The E4BP4 repression domain interacts specifically with the TBP-binding repressor protein Dr1; E4BP4 mutants defective in repression are also deficient in Dr1 binding, indicating that Dr1 recruitment mediates E4BP4 transcriptional repression.\",\n      \"method\": \"Protein–protein interaction assay (in vitro binding), repression-domain mutant analysis\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct binding assay with functional mutant correlation, single lab, single method\",\n      \"pmids\": [\"8836190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"NFIL3/E4BP4 expression is regulated by IL-3 in murine pro-B cells as a delayed-early gene requiring de novo protein synthesis; enforced NFIL3 expression promotes survival (but not growth) of IL-3-deprived pro-B cells, positioning NFIL3 downstream of IL-3 in an anti-apoptotic signaling pathway.\",\n      \"method\": \"Northern blot, cytokine withdrawal survival assay, cDNA overexpression\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function rescue of apoptosis with IL-3-dependence characterization, multiple methods, single lab\",\n      \"pmids\": [\"9122243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"E4BP4 mRNA is induced by the synthetic glucocorticoid dexamethasone in mouse fibroblasts, and E4BP4-binding elements are present in the promoters of glucocorticoid-repressed genes COX-2, iNOS, and cPLA2, suggesting E4BP4 mediates glucocorticoid gene repression.\",\n      \"method\": \"cDNA subtraction screening, Northern blot, promoter sequence analysis\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — expression induction confirmed but functional link to promoters is computational/correlative only, single lab\",\n      \"pmids\": [\"9125190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"NFIL3 expression is regulated by oncogenic Ras through both the Raf-MAPK and PI3K pathways in IL-3-dependent pro-B cells; NFIL3-mediated survival is independent of Bcl-xL, defining two parallel IL-3 survival pathways.\",\n      \"method\": \"Oncogenic Ras mutants, kinase pathway inhibitors, survival assays\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic pathway dissection with pathway-specific inhibitors and oncogenic mutants, single lab\",\n      \"pmids\": [\"10082541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"E4BP4 represses HBV core promoter and enhancer II transcription; its repressive mechanism requires DNA binding (binding site occlusion) and does not strictly require a separate repression domain beyond the DNA-binding domain.\",\n      \"method\": \"Transient transfection reporter assay, E4BP4 overexpression, antisense experiments\",\n      \"journal\": \"Journal of Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — multiple reporter constructs and antisense reversal, single lab\",\n      \"pmids\": [\"10074173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"E4BP4 binds to HBV enhancer II (nucleotides 1640–1663) and suppresses its transcriptional activity, in contrast to HLF and FTF which activate the same element.\",\n      \"method\": \"Yeast one-hybrid screening, transcriptional activity assays\",\n      \"journal\": \"Journal of Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — yeast one-hybrid plus transcriptional assays, single lab\",\n      \"pmids\": [\"10627534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"E4BP4 oscillates in antiphase to the PAR transcription factors (DBP, HLF, TEF) in the SCN and liver; E4BP4 suppresses while PAR proteins activate transcription from the shared PAR/E4BP4 binding site; E4BP4 cannot dimerize with PAR proteins but competes for the same DNA sites. In Cry-deficient mice, E4bp4 levels are sustained low while dbp is high, placing E4BP4 within the core circadian oscillatory mechanism.\",\n      \"method\": \"In situ hybridization, luciferase reporter assay, EMSA, Cry-knockout mouse analysis\",\n      \"journal\": \"Genes & Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (EMSA, reporter, in vivo mouse genetics), replicated across tissues\",\n      \"pmids\": [\"11316793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"IL-3-dependent transcription of E4bp4 requires a GATA motif downstream of the major transcription start site; both GATA-1 and GATA-2 bind this site in vitro and in vivo, with GATA-1 binding confirmed by ChIP; GATA-1 overexpression transactivates the E4bp4 reporter and modulates apoptosis on IL-3 withdrawal.\",\n      \"method\": \"Promoter deletion analysis, EMSA, chromatin immunoprecipitation, overexpression/apoptosis assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP in vivo binding plus functional reporter and apoptosis readout, single lab, multiple methods\",\n      \"pmids\": [\"12023274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PTH rapidly and transiently induces E4BP4 as a primary response gene in osteoblasts (no protein synthesis required); E4BP4 overexpression inhibits EBPRE-containing promoters and attenuates PTH-induced COX-2 promoter activity in osteoblasts.\",\n      \"method\": \"Northern blot, cycloheximide experiments, reporter assay, E4BP4 overexpression\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — primary response gene characterization with functional downstream reporter assay, single lab\",\n      \"pmids\": [\"12743120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Casein kinase 1ε (CK1ε) physically associates with E4BP4 and phosphorylates it at Ser182; CK1ε-catalyzed phosphorylation leads to proteasomal degradation of E4BP4 and attenuates E4BP4 nuclear accumulation and transcriptional repression of cPer2.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, proteasome inhibitor experiments, site-directed mutagenesis, luciferase reporter assay\",\n      \"journal\": \"Current Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted phosphorylation with mutagenesis, co-IP, functional reporter, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"15182670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"E4BP4 overexpression protects embryonic motoneurons from apoptosis induced by neurotrophic factor withdrawal or death receptor activation, and promotes neuronal cell size and axonal growth (3.5-fold longer axons) in a PI3K-dependent manner; in vivo overexpression in chick embryos reduced dying motoneurons by 45%.\",\n      \"method\": \"Motoneuron electroporation, survival and axon growth assays, PI3K inhibition, in ovo overexpression\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in primary neurons and in vivo, PI3K pathway dependency shown, single lab\",\n      \"pmids\": [\"15306565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"E4BP4 represses VWF promoter activity by binding a negative response element at nucleotides +96/+105 of the VWF promoter in vivo, as demonstrated by ChIP; the repressive mechanism is cell-type specific (larger E4BP4 forms bind DNA in HepG2 cells; smaller forms in endothelial cells do not bind directly but may sequester co-repressors).\",\n      \"method\": \"Chromatin immunoprecipitation, promoter reporter assays, site mutagenesis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms in vivo binding, mutagenesis shows functional dependence, single lab\",\n      \"pmids\": [\"15498853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"E4BP4 negatively regulates Per2 mRNA oscillation by binding a specific B-site in the mPer2 promoter; ChIP shows peak E4BP4 binding corresponds to trough Per2 mRNA; both the B-site and the E2 enhancer are required for robust circadian Per2 oscillation in the cell-autonomous clock.\",\n      \"method\": \"siRNA knockdown, luciferase reporter assay with promoter mutants, chromatin immunoprecipitation\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP in vivo, loss-of-function, and reporter mutagenesis in cell-autonomous clock, single lab, multiple methods\",\n      \"pmids\": [\"17182630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"E4BP4 physically interacts with PER2 (requiring the C-terminal repression domain) and with CRY2; these interactions place E4BP4 in a negative regulator complex of the mammalian circadian clock.\",\n      \"method\": \"Co-immunoprecipitation, deletion mutant analysis\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP experiment identifying interactions, no reconstitution, single lab\",\n      \"pmids\": [\"17274955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"E4BP4/NFIL3 is essential for NK cell development in a cell-intrinsic manner, acting downstream of the IL-15 receptor and upstream of (and through) the transcription factor Id2; E4BP4-deficient mice specifically lack NK cells while retaining B, T, and NKT cells.\",\n      \"method\": \"Nfil3-/- mouse generation, bone marrow reconstitution, cytotoxicity assays, hematopoietic progenitor overexpression\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent Nfil3-/- mouse lines (PMIDs 19749763 and 19995955), cell-intrinsic chimera experiments, multiple functional readouts\",\n      \"pmids\": [\"19749763\", \"19995955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NFIL3 is required for IgE class switching in a B-cell-intrinsic manner; NFIL3 binds the Iε promoter in vivo (ChIP) and is required for IL-4/LPS-induced germline epsilon (GLε) transcript production; NFIL3 expression in NFIL3-deficient B cells restores GLε transcription.\",\n      \"method\": \"Nfil3-/- mice, B-cell chimeras, chromatin immunoprecipitation, rescue experiments, cycloheximide GLε induction\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP in vivo binding, cell-intrinsic chimera, rescue experiment, single lab with multiple methods\",\n      \"pmids\": [\"20080759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"E4BP4 represses FGF21 transcription by binding a D-box element in the distal Fgf21 promoter; this repression is insulin-responsive via AKT-mediated induction of E4BP4. E4BP4 knockdown augments Fgf21 oscillation amplitude and overexpression represses FGF21 secretion from primary hepatocytes.\",\n      \"method\": \"ChIP, luciferase reporter assay, siRNA knockdown, overexpression in hepatocytes, D-box mutagenesis\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP, reporter with mutagenesis, primary hepatocyte functional assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20851878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NFIL3/E4BP4 is essential for CD8α+ conventional dendritic cell development; Nfil3-/- mice specifically lack CD8α+ cDCs but retain CD8α- cDCs and pDCs. NFIL3 regulates CD8α+ cDC development partly through Batf3 expression; loss of NFIL3 impairs cross-priming of CD8+ T cells and IL-12 production after TLR3 stimulation.\",\n      \"method\": \"Nfil3-/- mice, bone marrow reconstitution, Flt3L cultures, T cell cross-priming assay, cytokine production assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Nfil3-/- mouse with multiple functional readouts and upstream Batf3 regulatory link, single lab\",\n      \"pmids\": [\"21474667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NFIL3 is a negative regulator of IL-12 p40 (Il12b) transcription in macrophages; NFIL3 binds the Il12b promoter (confirmed by ChIP); NFIL3 is induced by IL-10/STAT3 signaling and its repression of Il12b does not require IL-10 but requires a C-terminal minimal repression domain.\",\n      \"method\": \"ChIP, luciferase reporter with BAC-GFP reporter line, shRNA knockdown, Nfil3-/- mice\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP in vivo, loss-of-function in macrophages with multiple reporters and KO mice, domain-deletion repression analysis, single lab\",\n      \"pmids\": [\"21383239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A single NFIL3-binding site 10 kb upstream of Il12b is required for IL-10/STAT3-mediated repression of IL-12p40; NFIL3 binds this enhancer site and myeloid cells lacking NFIL3 overproduce IL-12p40 and IL-12p70.\",\n      \"method\": \"Enhancer deletion, ChIP, site mutagenesis, Nfil3-/- myeloid cells\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP with mutagenesis of binding site and KO validation, single lab, multiple methods\",\n      \"pmids\": [\"21566115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"E4BP4 regulates IL-10 and IL-13 production in CD4+ T cells: enforced E4BP4 expression drives IL-10 and IL-13 production in Th1 cells; E4bp4-/- Th1 cells, Treg cells, and NKT cells show attenuated IL-10 and IL-13; E4bp4-/- Th2 cells show impaired IL-10 (but not IL-13) production.\",\n      \"method\": \"Nfil3-/- mice, retroviral overexpression, cytokine ELISA and intracellular staining\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function in multiple T cell subsets, single lab with multiple methods\",\n      \"pmids\": [\"21460847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NFIL3 directly binds and negatively regulates the Il13 gene in Th2 cells; NFIL3 deficiency increases IL-13 and IL-5 but decreases IL-4 production in a T-cell-intrinsic manner.\",\n      \"method\": \"ChIP, retroviral NFIL3 expression, Nfil3-/- Th2 cell cytokine analysis\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrates direct Il13 binding, gain- and loss-of-function, T-cell intrinsic transfer, single lab\",\n      \"pmids\": [\"21499227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DBP (positive D-box regulator) knockdown shortens the circadian period of Per1/Per2 reporters in fibroblasts, while E4BP4 (negative D-box regulator) knockdown has the opposite effect; overexpression produces reciprocal phenotypes, demonstrating that D-box regulators including E4BP4 determine circadian period length.\",\n      \"method\": \"siRNA knockdown, cDNA overexpression, bioluminescent reporter assay in Rat-1 fibroblasts\",\n      \"journal\": \"FEBS Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — cell-based oscillator assay with bidirectional perturbation, single lab\",\n      \"pmids\": [\"21635892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"E4BP4 represses Fgf21 via recruitment of histone methyltransferase G9a, which catalyzes H3K9me2 at the Fgf21 promoter; E4BP4 physically interacts with G9a; G9a SET-domain deletion abolishes repression; acute hepatic G9a knockdown de-represses Fgf21 during refeeding.\",\n      \"method\": \"Co-immunoprecipitation, G9a inhibitor (BIX01294), H3K9me2 ChIP, overexpression, shRNA knockdown, adenoviral G9a depletion in vivo\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP, catalytic mutant, histone ChIP, and in vivo rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"23283977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Nfil3 is required only early during NK cell development (at or before the NK progenitor stage); specific deletion in mature peripheral NK cells or immature BM NK cells has no effect on lineage maintenance; viral signals (Ly49H engagement, proinflammatory cytokines) can bypass Nfil3 to generate Ly49H+ NK cells in Nfil3-/- mice infected with MCMV.\",\n      \"method\": \"Conditional Nfil3 deletion (immature/mature NK stages), MCMV infection model, memory NK cell persistence assay\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — stage-specific conditional KO with multiple functional assays, replicated across conditions, single lab\",\n      \"pmids\": [\"24277151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Nfil3 is required for glucocorticoid-induced apoptosis (GICD) in T cells; a glucocorticoid response element 5 kb upstream of the Nfil3 promoter is bound by GR (confirmed by ChIP); Nfil3 siRNA knockdown to 20% of normal abrogates GICD in CTLL-2 T cells.\",\n      \"method\": \"Microarray, ChIP, siRNA knockdown, apoptosis assay\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms GRE binding, siRNA functional assay, single lab\",\n      \"pmids\": [\"23425966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"E4BP4 binds directly to the regulatory regions of both Eomes and Id2 genes and promotes their transcription; E4BP4 is required at the CLP stage for NK lineage commitment; forced Eomes and Id2 expression can rescue NK production from E4bp4-/- progenitors.\",\n      \"method\": \"ChIP, progenitor rescue experiments with retroviral Eomes/Id2, CLP-stage conditional analysis\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP confirms direct binding, genetic epistasis by rescue, stage-specific analysis, single lab with multiple methods\",\n      \"pmids\": [\"24663216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NFIL3 directs differentiation of a committed ILC precursor (αLP/CXCR6+ cells) that gives rise to all ILC lineages; NFIL3 was required in the CLP and directly regulates TOX expression to govern ILC development.\",\n      \"method\": \"Nfil3-/- mice, clonal differentiation assays, conditional knockouts, ChIP for TOX regulation\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clonal differentiation experiments, direct TOX regulation by ChIP, cell-intrinsic analysis, single lab\",\n      \"pmids\": [\"25310240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Nfil3 is required for formation of Eomes-expressing NK cells (conventional medullary and thymic NK), but TRAIL+ Eomes- NK cells develop independently of Nfil3; restoration of Eomes in Nfil3-/- progenitors rescues conventional NK development.\",\n      \"method\": \"Nfil3-/- mice, retroviral Eomes rescue, flow cytometry phenotyping\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Nfil3-/- phenotyping with Eomes rescue, single lab\",\n      \"pmids\": [\"24532575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NFIL3 exerts its function via direct Id2 regulation in the CHILP; ectopic Id2 expression in Nfil3-null precursors rescues ILC lineage development in vivo; IL-7 controls Nfil3 expression in lymphoid progenitors.\",\n      \"method\": \"Conditional Nfil3 ablation, Id2 rescue experiments, ChIP for Id2 regulation\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct Id2 regulation by ChIP, in vivo rescue, cell-intrinsic conditional KO, single lab\",\n      \"pmids\": [\"25801035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NFIL3 is a microbiota-dependent, IL-10-independent regulator of IL-12p40 in the colon; Nfil3-/- mice develop spontaneous colitis that is abrogated by additional Il12b deletion and requires microbiota (germ-free Nfil3-/- mice are protected).\",\n      \"method\": \"Double-KO mice (Nfil3-/-/Il12b-/-), germ-free Nfil3-/- mice, CD4+ T cell adoptive transfer\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double KO, germ-free experiment, adoptive transfer, multiple orthogonal in vivo approaches\",\n      \"pmids\": [\"24442434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IL-27 induces NFIL3 in T cells; NFIL3 promotes permissive chromatin remodeling at the Tim-3 locus and induces Tim-3 and IL-10 co-expression; IL-27/NFIL3 axis drives T cell dysfunction and reduced effector function in a NFIL3-dependent manner.\",\n      \"method\": \"IL-27R-/- mice, NFIL3 overexpression/knockdown, chromatin accessibility/histone modification assays, Tim-3 expression analysis\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IL-27R-/- mouse in vivo phenotype, NFIL3 gain/loss-of-function, chromatin assay, single lab with multiple methods\",\n      \"pmids\": [\"25614966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PDK1 connects IL-15 signaling to E4BP4 induction in NK cells via mTOR; PDK1-deficient NK cells show reduced mTOR activation, E4BP4 induction, and CD122 expression; ectopic E4BP4 expression or mTOR activation partially rescues NK development from PDK1-deficient progenitors, defining a PDK1-mTOR-E4BP4-CD122 positive feedback loop.\",\n      \"method\": \"Conditional PDK1 KO, retroviral E4BP4 overexpression, mTOR activation rescue, CD122 expression analysis\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with gain-of-function rescue, pathway epistasis, single lab with multiple methods\",\n      \"pmids\": [\"25624444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"E4BP4 promotes survival of IL-5-stimulated eosinophils against glucocorticoid-induced apoptosis; IL-5 and dexamethasone synergistically induce NFIL3; siRNA-mediated NFIL3 inhibition or Pim-1 kinase blockade abrogates the IL-5 protective effect, identifying crosstalk between IL-5 anti-apoptotic pathways and GR transactivation via NFIL3.\",\n      \"method\": \"siRNA knockdown, Pim-1 inhibitor, apoptosis assays, proteomic analysis\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — siRNA functional assay with pharmacological inhibitor, single lab\",\n      \"pmids\": [\"26880402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"E4BP4 is an insulin-induced stabilizer of nuclear SREBP-1c in hepatocytes; E4BP4 interacts with nuclear SREBP-1c to preserve its acetylation and protect it from ubiquitination-dependent degradation, thereby promoting SREBP-1c-mediated de novo lipogenesis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, acetylation assay, adenoviral shRNA liver depletion, E4bp4-/- hepatocytes\",\n      \"journal\": \"Journal of Lipid Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP, ubiquitination/acetylation biochemistry, in vivo liver depletion, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"27252523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Smad3 directly suppresses E4BP4/NFIL3 transcription; Smad3 deletion enhances E4BP4-mediated NK cell differentiation and anti-tumor effector functions; Smad3 suppresses IFN-γ expression via E4BP4 in a T-bet-independent manner.\",\n      \"method\": \"Smad3-/- bone marrow NK differentiation, ChIP/transcription assays for E4BP4 as Smad3 target, IFN-γ assays, Smad3 inhibitor (SIS3) in vivo\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct transcriptional target ChIP, KO ex vivo differentiation, in vivo tumor model, single lab\",\n      \"pmids\": [\"28262747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The intestinal microbiota regulates NFIL3 transcription in intestinal epithelial cells (IECs) through group 3 ILCs, STAT3, and the epithelial circadian clock; NFIL3 controls a circadian lipid metabolic program in IECs and regulates lipid absorption and export.\",\n      \"method\": \"Nfil3-/- mice, germ-free mice, ILC3-depleted mice, STAT3 pathway analysis, lipid absorption assays, circadian gene expression\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (germ-free, ILC3 depletion, Nfil3-/-), STAT3 pathway, functional lipid assays, published in high-tier journal\",\n      \"pmids\": [\"28860383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NFIL3 represses hepatic gluconeogenesis by competing with CREB for binding at cAMP response elements in gluconeogenic gene promoters (e.g., PEPCK, G6Pase); this requires the NFIL3 bZIP DNA-binding domain; hepatic NFIL3 is decreased in insulin-resistant mice and its ectopic expression in insulin-resistant livers ameliorates hyperglycemia.\",\n      \"method\": \"ChIP, luciferase reporter assay, adenoviral hepatic NFIL3 delivery in ob/ob and HFD mice, primary hepatocyte glucose production assays\",\n      \"journal\": \"Metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP, reporter with binding competition, in vivo rescue of hyperglycemia, single lab with multiple methods\",\n      \"pmids\": [\"29132537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"E4BP4 regulates carboxylesterase 2 (Ces2) enzymes by antagonizing Rev-erbα transrepression; E4BP4 directly interacts with Rev-erbα (Co-IP); Rev-erbα represses Ces2b by binding its promoter (-767 to -754 bp); E4BP4 loss down-regulates Ces2 genes and impairs CPT-11 pharmacokinetics.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter, EMSA, E4bp4-/- mice, pharmacokinetic studies\",\n      \"journal\": \"Biochemical Pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP, EMSA, reporter with site identification, in vivo pharmacokinetic validation, single lab\",\n      \"pmids\": [\"29653076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"E4BP4 inhibits Tfh cell differentiation by recruiting repressive epigenetic modifiers HDAC1 and EZH2 to repress Bcl6 transcription; phosphorylation-site mutants of E4BP4 show limited capability to inhibit Tfh differentiation; E4BP4 phosphorylation is impaired in SLE patients.\",\n      \"method\": \"Conditional E4bp4 KO and knockin T cells, ChIP for HDAC1/EZH2 recruitment, phosphorylation mutant analysis, SLE patient samples\",\n      \"journal\": \"Journal of Clinical Investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for epigenetic modifier recruitment, conditional KO/KI, phospho-mutant, single lab with multiple methods\",\n      \"pmids\": [\"32191636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"E4BP4 interacts with G9a to form a multi-molecular complex on the SOSTDC1 promoter in thyroid cancer cells, causing SOSTDC1 silencing through G9a-mediated histone methylation, which leads to deregulated hepcidin secretion and iron dysregulation promoting cancer proliferation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, in vivo xenograft, luciferase assay\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP with functional in vivo validation, single lab\",\n      \"pmids\": [\"30250199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NFIL3 acts as a transcriptional activator of the PRNP promoter in lung adenocarcinoma cells, driving PrPc expression; NFIL3-induced cell migration and invasion requires PrPc and proceeds through JNK signaling-dependent lamellipodium formation.\",\n      \"method\": \"Luciferase reporter assay, ChIP, PrPc knockdown, JNK inhibitor, migration/invasion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms NFIL3 binding to PRNP promoter, pathway epistasis with JNK inhibitor, single lab\",\n      \"pmids\": [\"31477838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NFIL3 directly binds and negatively regulates Foxp3 expression in Treg cells; NFIL3 overexpression in Treg cells induces methylation at Foxp3 locus CpG regulatory sites, diminishing Foxp3 and other Treg signature genes, impairing immunosuppressive activity.\",\n      \"method\": \"ChIP, bisulfite sequencing, overexpression in Treg cells, in vitro and in vivo suppression assays\",\n      \"journal\": \"Experimental & Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrates direct Foxp3 binding, bisulfite sequencing shows methylation change, functional suppression assay, single lab\",\n      \"pmids\": [\"31311918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"An Nfil3-Zeb2-Id2 genetic circuit controls cDC1 progenitor development: Nfil3 is required for transition from Zeb2hi/Id2lo CDPs to Zeb2lo/Id2hi CDPs (earliest committed cDC1 progenitors), blocking E-protein activity to exclude pDC potential.\",\n      \"method\": \"Single-cell RNA sequencing, genetic epistasis (Nfil3, Zeb2, Id2 KO combinations)\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — scRNA-seq combined with genetic epistasis in multiple KO combinations, single lab\",\n      \"pmids\": [\"31406377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"E4bp4 negatively regulates Cyp3a11 expression and activity in liver, kidney, and intestine by directly binding the C-site (-1539/-1529 bp) in the Cyp3a11 promoter; E4bp4-/- mice show elevated Cyp3a11 activity and reduced systemic midazolam exposure.\",\n      \"method\": \"E4bp4-/- mice, luciferase reporter, EMSA, microsomal enzyme activity, pharmacokinetic studies\",\n      \"journal\": \"Biochemical Pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA defines binding site, reporter assay, KO in vivo pharmacokinetics, single lab with multiple methods\",\n      \"pmids\": [\"30796914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PBX1 directly binds the Nfil3 promoter and upregulates NFIL3 expression to promote early NK cell development; knockout of the PBX1 binding site in the Nfil3 promoter reduces NK progenitor and NK cell numbers phenocopying Nfil3 KO; PBX1 residue N286 in the homeodomain is required for Nfil3 promoter binding.\",\n      \"method\": \"Conditional PBX1 KO, ChIP, CRISPR-mediated Nfil3 promoter binding-site KO, PBX1 homeodomain mutagenesis\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, in vivo CRISPR binding-site KO phenotype, homeodomain mutagenesis, single lab with multiple methods\",\n      \"pmids\": [\"32190943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"REV-ERBα/β repress E4BP4 transcription in cardiomyocytes; loss of Rev-erbs causes E4BP4 induction; E4BP4 directly controls circadian Nampt expression and NAD+ production via distal cis-regulatory elements; this REV-ERB→E4BP4→NAMPT→NAD+ pathway is required for cardiac metabolic homeostasis and function.\",\n      \"method\": \"Cardiomyocyte-specific Rev-erb double KO mice, ChIP for E4BP4 binding to Nampt enhancers, NAD+ metabolite measurement, dilated cardiomyopathy phenotype analysis\",\n      \"journal\": \"Nature Cardiovascular Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO, ChIP for direct target binding, metabolite measurement, in vivo cardiac phenotype, single lab with multiple methods\",\n      \"pmids\": [\"35036997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"mTORC1 primarily promotes E4BP4 expression to regulate early NK cell differentiation (iNK stage), while both mTORC1 and mTORC2 enhance T-bet expression; mTORC2 deficiency specifically impairs CD27-CD11b- early iNK cells.\",\n      \"method\": \"CD122-Cre and Ncr1-Cre mediated conditional KO of mTOR, Raptor, Rictor; flow cytometry; E4BP4 and T-bet expression analysis\",\n      \"journal\": \"Cell Death and Differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stage-specific conditional KO of two mTOR complexes, single lab with multiple genetic tools\",\n      \"pmids\": [\"33462410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NFIL3 promotes transcription of REDD1 by binding to its promoter; REDD1 augments neutrophil autophagy and NET formation by inhibiting mTOR; NFIL3 silencing reduces inflammatory injury in acute gouty arthritis mice by inhibiting neutrophil autophagy and NET formation via the REDD1/mTOR pathway.\",\n      \"method\": \"ChIP/luciferase for REDD1 promoter binding, NFIL3 gain/loss-of-function in neutrophils, in vivo gout model with NFIL3 silencing, autophagy and NET assays\",\n      \"journal\": \"Frontiers in Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms REDD1 promoter binding, in vivo pathway validation, single lab\",\n      \"pmids\": [\"34660620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NFIL3 directly suppresses NFKBIA transcription (confirmed by ChIP and luciferase reporter), thereby enhancing NF-κB signaling to promote TNBC cell proliferation and metastasis; NFIL3 also auto-represses its own transcription.\",\n      \"method\": \"ChIP, luciferase reporter assay, colony formation, migration, transwell assay, subcutaneous tumor model, tail-vein injection metastasis model\",\n      \"journal\": \"Journal of Experimental & Clinical Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter for NFKBIA, in vitro and in vivo functional validation, single lab\",\n      \"pmids\": [\"35180863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"E4BP4 inhibits the ERK1/2 signaling pathway in microglia by trans-repressing Mapk1/3 (genes encoding ERK1/2) via direct binding to D-box elements in their promoter regions, thereby restraining microglial activation; microglial E4bp4 deletion exacerbates delirium-associated cognitive decline.\",\n      \"method\": \"Microglial-specific E4bp4 KO, ChIP for Mapk1/3 D-box binding, scRNA-seq, ERK1/2 activation assays, cognitive behavioral tests\",\n      \"journal\": \"Advanced Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms direct Mapk1/3 promoter binding, cell-type-specific KO, single lab\",\n      \"pmids\": [\"35713240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"E4BP4 is modified by SUMOylation at five lysine residues; HFD feeding induces deSUMOylation of hepatic E4BP4; SUMOylated E4BP4 downregulates Fsp27 and lipid droplet formation, while deSUMOylated (active) E4BP4 enhances Fsp27 transactivation via CREBH interaction to promote liver steatosis.\",\n      \"method\": \"SUMOylation mutants, Co-IP for CREBH interaction, primary hepatocyte lipid assays, HFD E4bp4-LKO mice, Fsp27 overexpression rescue\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — SUMOylation site mutants, Co-IP, in vivo liver-specific KO, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"36508222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Hepatocyte E4BP4 interacts with and stabilizes YAP; E4BP4 induces OPN (osteopontin) via YAP to activate hepatic stellate cells and promote liver fibrosis; E4BP4 overexpression in hepatocytes activates HSCs in medium transfer experiments, and this is abrogated by OPN neutralization or depletion.\",\n      \"method\": \"Co-IP for E4BP4-YAP interaction, RNA-Seq, OPN antibody neutralization, shRNA Opn depletion, medium transfer HSC activation assay, hepatocyte-specific E4bp4 KO in NASH diet and CCl4 models\",\n      \"journal\": \"Advanced Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP, RNA-Seq, antibody neutralization, genetic rescue, multiple in vivo models, single lab\",\n      \"pmids\": [\"39473081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"hnRNP A1 binds a specific region of the Nfil3 5'-UTR IRES and regulates cap-independent, IRES-mediated translation of Nfil3 mRNA; hnRNP A1 knockdown abolishes Nfil3 protein oscillation without affecting mRNA oscillation, revealing a post-transcriptional layer of circadian Nfil3 regulation.\",\n      \"method\": \"IRES reporter assay, RNA pulldown, hnRNP A1 knockdown, circadian protein/mRNA tracking\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IRES functional assay, RNA pulldown identifying binding protein, loss-of-function, single lab\",\n      \"pmids\": [\"28220845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"E4BP4 SUMOylation and phosphorylation modulate its function and NK cell development; a novel E4bp4 target gene is Notch1; abrogation of Notch signaling impedes NK cell production; complete absence of NK development from E4bp4-/- progenitors is fully rescued by short exposure to Notch peptide ligands.\",\n      \"method\": \"Post-translational modification mutants, Notch ChIP/reporter identification, Notch ligand rescue of NK progenitors, NK cell development assays\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PTM mutants with functional readout, Notch rescue experiment, single lab\",\n      \"pmids\": [\"29311361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"E4BP4 promotes hepatic lipid accumulation by suppressing AMPK activity through promotion of AMPKβ1 ubiquitination and degradation; hepatic E4bp4 induction by ER stress (tunicamycin, HFLMCD diet) is partially dependent on CHOP and requires an E-box in the E4bp4 promoter.\",\n      \"method\": \"E4bp4 liver-specific KO mice, AMPKβ1 ubiquitination assay, primary hepatocyte lipid assays, AMPKβ1 depletion rescue, promoter E-box mutation analysis\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay for AMPKβ1 degradation, liver-specific KO, rescue experiment, single lab\",\n      \"pmids\": [\"32780887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"E4BP4 directly represses SOSTDC1 expression in breast cancer cells; E4BP4 binding regions in the SOSTDC1 promoter were identified by deletion analysis; E4BP4 knockdown combined with demethylation treatment up-regulates SOSTDC1 and inhibits cell proliferation.\",\n      \"method\": \"Promoter deletion/reporter assay, E4BP4 knockdown, 5'-Aza-dC treatment, cell proliferation assay\",\n      \"journal\": \"Cellular Oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — promoter deletion only (no ChIP confirming direct binding), single lab\",\n      \"pmids\": [\"25338303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PTH induces E4bp4 mRNA expression in osteoblasts primarily through cAMP-PKA signaling; PKA inhibitor H89 blocks PTH- and forskolin-induced E4bp4; PTH(3-34) (lacking cAMP activation) does not induce E4bp4; this pathway is confirmed in vivo.\",\n      \"method\": \"Pharmacological signaling dissection (H89, 8-Br-cAMP, PMA, ionomycin), PTH(3-34) mutant, in vivo PTH injection\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple signaling pathway probes with dominant-negative PTH analog, in vivo confirmation, single lab\",\n      \"pmids\": [\"15087429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"α1-adrenergic receptor signaling in osteoblasts upregulates Nfil3/E4BP4, which then binds to D-box elements in the Bmp4 promoter (confirmed by ChIP) to repress Bmp4 expression in a circadian manner.\",\n      \"method\": \"ChIP for E4BP4 binding to Bmp4 promoter, α1-AR agonist treatment, gain/loss-of-function for Nfil3, circadian expression analysis\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms direct D-box binding, functional gain/loss of function, single lab\",\n      \"pmids\": [\"24794868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NFIL3 promotes transcription of REDD1 (binding its promoter) and regulates ferroptosis and inflammation in sepsis-associated acute kidney injury; NFIL3 knockdown attenuates renal tubular ferroptosis and inflammation by downregulating ACSL4.\",\n      \"method\": \"NFIL3 knockdown in vitro and in vivo SA-AKI models, ACSL4 expression analysis, ferroptosis markers\",\n      \"journal\": \"Cell Death Discovery\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — loss-of-function with correlative ACSL4 analysis, no direct ChIP for ACSL4 promoter shown in abstract, single lab\",\n      \"pmids\": [\"39097582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"H2S sulfhydrylates NFIL3 protein, which reduces NFIL3 binding to the MEST promoter (confirmed by ChIP-qPCR and luciferase assay) and thereby suppresses MEST transcription, inhibiting low-shear-stress-induced endothelial-mesenchymal transition and atherosclerosis.\",\n      \"method\": \"ChIP-qPCR, luciferase reporter assay, NFIL3 knockdown, H2S donor treatment, sulfhydrylation assay\",\n      \"journal\": \"Nitric Oxide\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP-qPCR and reporter with PTM (sulfhydrylation), loss-of-function, single lab\",\n      \"pmids\": [\"38049061\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NFIL3/E4BP4 is a bZIP transcription factor that acts predominantly as a transcriptional repressor (via a C-terminal 65-aa repression domain that recruits the co-repressor Dr1, and via epigenetic co-repressors G9a and HDAC1/EZH2) but can also activate transcription depending on context; it is regulated post-translationally by CK1ε-mediated phosphorylation (leading to proteasomal degradation), SUMOylation, and sulfhydrylation, and at the translational level by hnRNP A1-dependent IRES activity; in the circadian clock it oscillates in antiphase to PAR proteins (DBP/HLF/TEF), competing for the same D-box sites to repress circadian target genes including Per2, Fgf21, Nampt, and Bmp4; in immunity it is an essential cell-intrinsic transcription factor downstream of IL-15/PDK1/mTORC1 that directly activates Id2, Eomes, TOX, and Notch1 to drive commitment and development of NK cells and all ILC lineages, while also regulating IgE class switching in B cells, CD8α+ cDC development via Batf3, and T cell effector function via Tim-3/IL-10 and Tfh suppression via Bcl6/EZH2; in metabolism it suppresses hepatic gluconeogenesis by competing with CREB at CRE sites, promotes de novo lipogenesis by stabilizing SREBP-1c acetylation, and regulates lipid droplet biogenesis through Fsp27 transactivation via CREBH after HFD-induced deSUMOylation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NFIL3 (E4BP4) is a basic leucine-zipper transcription factor that integrates cytokine and metabolic signals to control immune cell development, circadian gene expression, and hepatic lipid and glucose metabolism, acting predominantly as a repressor but also as a context-dependent activator [#9, #17, #29]. Its repressor function is conferred by a discrete C-terminal 65-amino-acid domain that recruits the TBP-binding co-repressor Dr1, and is amplified by epigenetic co-repressors including the histone methyltransferase G9a and the HDAC1/EZH2 machinery [#0, #3, #26, #42]. In the circadian clock NFIL3 oscillates in antiphase to the PAR factors (DBP/HLF/TEF), competing for shared D-box sites to repress targets such as Per2, Fgf21, Nampt, and Bmp4, thereby setting period and amplitude [#9, #15, #19, #49, #61]. In immunity NFIL3 is an essential cell-intrinsic factor acting downstream of IL-15 via a PDK1–mTORC1 axis to drive NK cell and innate lymphoid cell commitment through direct transactivation of Id2, Eomes, TOX, and Notch1, and it independently directs CD8\\u03b1+/cDC1 dendritic cell development through Batf3 and a Zeb2–Id2 circuit [#17, #29, #30, #32, #35, #46, #57]. Beyond lineage specification NFIL3 tunes effector function by repressing Il12b in myeloid cells, repressing Bcl6 to limit Tfh differentiation, repressing Foxp3 in Tregs, and driving Tim-3/IL-10 co-expression downstream of IL-27 [#21, #22, #34, #42, #45]. In the liver NFIL3 suppresses gluconeogenesis by competing with CREB at CRE sites, while promoting de novo lipogenesis by stabilizing nuclear SREBP-1c and, after HFD-induced deSUMOylation, transactivating the lipid-droplet gene Fsp27 via CREBH [#37, #40, #54]. NFIL3 protein abundance and activity are set post-translationally by CK1\\u03b5-mediated Ser182 phosphorylation that triggers proteasomal degradation, by SUMOylation, by sulfhydrylation, and translationally by hnRNP A1-dependent IRES activity [#12, #54, #56, #63].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established that NFIL3 acts as a transcriptional repressor through a defined, transferable domain rather than as a generic DNA binder, localizing its repressive function molecularly.\",\n      \"evidence\": \"deletion mapping, GAL4 fusion reporters, and charge-mutagenesis of a 65-aa C-terminal domain\",\n      \"pmids\": [\"8127655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The general transcription machinery contact was inferred, not identified\", \"Did not establish the in vivo target genes repressed via this domain\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Showed NFIL3 can also act as a sequence-specific activator, demonstrating its dual transcriptional capacity depends on promoter context.\",\n      \"evidence\": \"DNase I footprinting, EMSA, and cotransfection reporter assays on the IL-3 promoter\",\n      \"pmids\": [\"7565758\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism switching between activation and repression unresolved\", \"No co-factor identified for activation\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Identified the co-repressor Dr1 as the molecular mediator of NFIL3 repression, connecting the repression domain to the basal transcription machinery.\",\n      \"evidence\": \"in vitro protein binding with repression-defective mutant correlation\",\n      \"pmids\": [\"8836190\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single in vitro binding method without reciprocal validation\", \"Not shown on an endogenous target gene\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Placed NFIL3 downstream of cytokine survival signaling, showing it transduces IL-3 anti-apoptotic signals in lymphoid progenitors.\",\n      \"evidence\": \"Northern blot, cytokine-withdrawal survival assay, and cDNA overexpression in pro-B cells\",\n      \"pmids\": [\"9122243\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Pro-survival target genes not defined\", \"Relationship between repressor activity and survival function unclear\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Embedded NFIL3 in the core circadian oscillator as the negative D-box regulator opposing PAR activators through DNA-site competition.\",\n      \"evidence\": \"in situ hybridization, luciferase reporters, EMSA, and Cry-knockout mouse analysis in SCN and liver\",\n      \"pmids\": [\"11316793\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct clock target genes not yet enumerated\", \"Mechanism placing E4bp4 downstream of CRY not fully resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the principal post-translational control of NFIL3 stability, showing CK1\\u03b5 phosphorylation at Ser182 drives proteasomal degradation and limits repression.\",\n      \"evidence\": \"co-IP, in vitro kinase assay, proteasome inhibition, site-directed mutagenesis, and reporter assays\",\n      \"pmids\": [\"15182670\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase counteracting CK1\\u03b5 not identified\", \"Whether degradation is gated by circadian or signaling inputs unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Provided direct in vivo evidence that NFIL3 represses a clock gene by binding the Per2 promoter B-site, mechanizing its circadian role.\",\n      \"evidence\": \"siRNA knockdown, reporter mutagenesis, and ChIP correlating peak binding with trough Per2 mRNA\",\n      \"pmids\": [\"17182630\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Co-repressors recruited at the Per2 B-site not identified at this stage\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified NFIL3 as a non-redundant, cell-intrinsic master regulator of NK cell development acting downstream of IL-15 and upstream of Id2.\",\n      \"evidence\": \"two independent Nfil3-/- mouse lines, bone marrow chimeras, and progenitor overexpression\",\n      \"pmids\": [\"19749763\", \"19995955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect regulation of Id2 not yet shown by ChIP\", \"Developmental stage of NFIL3 requirement undefined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Broadened NFIL3's immune role beyond NK cells to dendritic cell development and cytokine programming, including IL-12p40 repression and IL-10/IL-13 control.\",\n      \"evidence\": \"Nfil3-/- mice, ChIP on Il12b/Il13 loci, enhancer mutagenesis, and gain/loss-of-function across DC and T cell subsets\",\n      \"pmids\": [\"21474667\", \"21383239\", \"21566115\", \"21460847\", \"21499227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same repression machinery operates across all loci unclear\", \"Direct vs Batf3-mediated DC effects not fully separated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mechanized NFIL3 repression epigenetically by showing direct recruitment of G9a to deposit H3K9me2 at the Fgf21 promoter.\",\n      \"evidence\": \"co-IP, G9a catalytic-mutant and inhibitor, H3K9me2 ChIP, and in vivo G9a depletion\",\n      \"pmids\": [\"23283977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of G9a recruitment to other NFIL3 targets not established here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolved the transcriptional circuitry of NFIL3-driven lymphopoiesis, showing direct activation of Eomes, Id2, and TOX at the common lymphoid/ILC precursor stage.\",\n      \"evidence\": \"ChIP, retroviral Eomes/Id2 rescue of Nfil3-/- progenitors, and stage-specific conditional analysis\",\n      \"pmids\": [\"24663216\", \"25310240\", \"24277151\", \"24532575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why NFIL3 is required only early/transiently in NK lineage not fully explained\", \"Eomes-independent TRAIL+ NK pathway mechanism unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected upstream signaling to NFIL3 induction, defining a PDK1\\u2013mTOR\\u2013E4BP4\\u2013CD122 feedback loop downstream of IL-15 and an IL-27\\u2013NFIL3\\u2013Tim-3/IL-10 dysfunction axis.\",\n      \"evidence\": \"conditional PDK1 KO with mTOR/E4BP4 rescue, and IL-27R-/- mice with chromatin accessibility assays\",\n      \"pmids\": [\"25624444\", \"25614966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mTORC1 target driving E4bp4 transcription not identified\", \"How IL-27 vs IL-15 inputs are integrated at the Nfil3 locus unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established NFIL3 as a hepatic metabolic regulator that stabilizes nuclear SREBP-1c to promote de novo lipogenesis.\",\n      \"evidence\": \"co-IP, ubiquitination/acetylation assays, adenoviral liver depletion, and E4bp4-/- hepatocytes\",\n      \"pmids\": [\"27252523\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NFIL3 preserves SREBP-1c acetylation mechanistically not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linked NFIL3 to systemic and intestinal metabolic control, integrating microbiota, ILC3, and circadian inputs to regulate epithelial lipid handling.\",\n      \"evidence\": \"germ-free, ILC3-depleted, and Nfil3-/- mice with STAT3 pathway analysis and lipid absorption assays; plus IRES translational regulation\",\n      \"pmids\": [\"28860383\", \"28220845\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct epithelial lipid-gene targets of NFIL3 incompletely mapped\", \"How circadian and microbial signals are integrated at the locus unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed NFIL3 represses gluconeogenesis and is itself a Smad3 target, expanding its metabolic and developmental regulatory network.\",\n      \"evidence\": \"ChIP, reporter competition with CREB, in vivo hepatic rescue of hyperglycemia, and Smad3-/- NK differentiation\",\n      \"pmids\": [\"29132537\", \"28262747\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CREB competition uses the same DNA element in all gluconeogenic promoters unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mechanized NFIL3 repression in adaptive immunity through HDAC1/EZH2 recruitment at Bcl6, and tied its activity to phosphorylation status relevant to autoimmunity.\",\n      \"evidence\": \"conditional KO/KI T cells, ChIP for HDAC1/EZH2 recruitment, phospho-mutants, and SLE patient samples\",\n      \"pmids\": [\"32191636\", \"29311361\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase/phosphatase controlling the relevant phosphosite in T cells not pinpointed\", \"Notch1 as direct target needs further validation beyond rescue\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined the upstream and downstream architecture of NFIL3-dependent cDC1 development and added drug-metabolism and Treg targets to its repertoire.\",\n      \"evidence\": \"scRNA-seq and genetic epistasis (Nfil3/Zeb2/Id2), PBX1 ChIP and promoter binding-site CRISPR KO, and Cyp3a11/Foxp3 ChIP with KO pharmacokinetics\",\n      \"pmids\": [\"31406377\", \"32190943\", \"30796914\", \"31311918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of PBX1 and cytokine inputs at the Nfil3 promoter unresolved\", \"Direct vs methylation-mediated Foxp3 repression mechanism incompletely separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Embedded NFIL3 in a REV-ERB\\u2192E4BP4\\u2192NAMPT\\u2192NAD+ circadian metabolic pathway controlling cardiac homeostasis.\",\n      \"evidence\": \"cardiomyocyte-specific Rev-erb double KO, ChIP at Nampt enhancers, and NAD+ metabolite measurement\",\n      \"pmids\": [\"35036997\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue specificity of the NAMPT regulation not generalized\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed SUMOylation as a metabolic switch and a CREBH partnership controlling lipid-droplet gene Fsp27, refining NFIL3's pro-steatotic role.\",\n      \"evidence\": \"SUMOylation-site mutants, co-IP for CREBH, HFD liver-specific KO, and Fsp27 rescue\",\n      \"pmids\": [\"36508222\", \"39473081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The deSUMOylating enzyme acting on E4BP4 after HFD not identified\", \"How SUMOylation status reprograms target selection mechanistically unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single bZIP factor selects between repression (Dr1/G9a/HDAC1/EZH2) and activation, and how its many post-translational modifications (phosphorylation, SUMOylation, sulfhydrylation) and translational IRES control are coordinately decoded to specify distinct immune, circadian, and metabolic outputs, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking PTM state to target-gene choice\", \"No structural basis for activator vs repressor mode\", \"Cross-talk between circadian, immune, and metabolic programs in vivo not integrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 9, 29, 40, 52]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 9, 15, 40, 47]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [37, 54, 55]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [12, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [9, 15, 19, 49, 61]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [17, 18, 20, 21, 30, 42]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 3, 26, 42]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [37, 40, 49, 54, 58]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [29, 30, 32, 46]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"Dr1\", \"G9a\", \"HDAC1\", \"EZH2\", \"CK1\\u03b5\", \"SREBP-1c\", \"PER2\", \"CREBH\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}