{"gene":"USF2","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":1996,"finding":"USF2 contains two distinct nuclear localization signals: the basic region and the conserved USF-specific region (USR). Two transcriptional activation domains were identified: the USR and an exon 5-encoded region. The USR activates transcription only in its natural context upstream of the USF2 basic region and only with reporter constructs containing the adenovirus major late minimal promoter (not E1b minimal promoter), unless an initiator element is inserted downstream of the TATA box. The exon 4-encoded region modulates the potency of the exon 5 activation domain.","method":"Indirect immunofluorescence with transiently transfected cells; cotransfection assays with deletion mutants fused to USF2 or GAL4 DNA-binding domains; reporter gene assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple deletion mutants, two independent reporter systems, and localization studies in a single rigorous study","pmids":["8657110"],"is_preprint":false},{"year":1997,"finding":"USF2 activity is required for glucose-stimulated L-pyruvate kinase (L-PK) promoter activity in single living islet beta-cells. Microinjection of anti-USF2 antibodies inhibited L-PK promoter activity by 71–87% at high glucose, and the effect was dependent on an intact L4 box (E-box elements at −165 and −154 bp).","method":"Photon-counting digital imaging of firefly luciferase in single living cells; microinjection of USF2-specific antibodies; reporter constructs with mutated L4 box","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, antibody microinjection plus reporter assay with mutant constructs; later contradicted by Wang & Wollheim 2002","pmids":["9252379"],"is_preprint":false},{"year":1997,"finding":"USF2 (FIP) interacts with the bZip transcription factor c-Maf via its bHLH domain. USF2 mutants lacking the leucine zipper formed heterodimers with c-Maf but did not homodimerize; deletion of the basic region or mutation of helices abolished c-Maf binding without affecting homodimerization. In the presence of USF2, the DNA binding activity of c-Maf was markedly reduced, suggesting a tetrameric USF2–c-Maf complex that inhibits c-Maf DNA binding.","method":"Yeast two-hybrid; in vitro binding with USF2 deletion/point mutants; gel-shift DNA binding assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — yeast two-hybrid plus in vitro binding assays, single lab, single study","pmids":["9070273"],"is_preprint":false},{"year":1998,"finding":"USF2 undergoes nuclear translocation in mast cells upon activation by IL-3 or IgE–antigen crosslinking. Prevention of USF2 nuclear translocation using a peptide derived from the USF-specific NLS region significantly inhibited IL-3-mediated mast cell survival, linking USF2 nuclear entry to cell viability.","method":"Subcellular fractionation; peptide inhibition of nuclear translocation; cell viability assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct localization experiment with functional consequence (cell survival), single lab, single study","pmids":["9743349"],"is_preprint":false},{"year":1999,"finding":"USF2-dependent transcriptional activation of the F1F0 ATP synthase alpha-subunit (ATPA) initiator element is mediated by the coactivator p300. Wild-type adenovirus E1A (which binds p300) inhibited USF2-dependent ATPA transactivation, whereas E1A mutants lacking p300-binding sites did not; overexpression of p300 reversed E1A inhibition.","method":"Cotransfection reporter assays; E1A mutant analysis; p300 overexpression rescue experiments","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter assays with E1A mutants and p300 overexpression, multiple orthogonal approaches, single lab","pmids":["10434034"],"is_preprint":false},{"year":2000,"finding":"USF1 and USF2 are the major transcription factors binding the FMR1 promoter in brain and testis extracts. Methylation of the FMR1 promoter reduces USF1/USF2 binding (to a lesser degree than its abolition of alpha-Pal/NRF-1 binding), suggesting methylation inhibits FMR1 transcription partly by blocking USF factor binding.","method":"Electrophoretic mobility shift assay (EMSA) with brain/testis nuclear extracts; identification of conserved binding sites; methylation interference assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA with tissue extracts and methylation interference, single lab, two orthogonal methods","pmids":["11058604"],"is_preprint":false},{"year":2001,"finding":"USF1 and USF2 bind to E-box elements in the APC tumor suppressor gene promoter (preferentially the E-box B site) and activate APC transcription. Mutation of E-box B completely abolished basal APC promoter activity; ectopic USF1/USF2 expression activated the APC promoter in HCT-116 cells.","method":"Transient transfection reporter assays; E-box site-directed mutagenesis; cotransfection with USF1/USF2 expression vectors","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — reporter assays with mutagenesis, single lab, single study","pmids":["11241666"],"is_preprint":false},{"year":2001,"finding":"USF1/USF2 heterodimer activates the human FcεRI alpha chain gene by binding a CAGCTG E-box element in the first intron. Overexpression of USF2 antisense repressed the FcεRI alpha chain promoter and decreased alpha chain mRNA in mast cell lines.","method":"EMSA with antibodies and in vitro translation products; USF2 antisense overexpression; promoter-reporter assays","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA, antisense knockdown, reporter assays, single lab","pmids":["11180124"],"is_preprint":false},{"year":2001,"finding":"USF-2 and USF-1 co-activate the HOXB4 promoter through an E-box (HXRE-2) in hematopoietic stem cells and K562 cells via the MAP kinase pathway, promoting stem cell self-renewal. MITF bound the same E-box but did not activate the HOXB4 promoter. USF-2 was identified by yeast one-hybrid screening of bone marrow and K562 libraries.","method":"Yeast one-hybrid assay; EMSA with K562 nuclear extracts; cotransfection in K562 and CD34+ cells; MAP kinase pathway inhibitor experiments","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast one-hybrid, EMSA, cotransfection assays with pathway inhibition, single lab","pmids":["11085749"],"is_preprint":false},{"year":2002,"finding":"ChREBP, not USF2, mediates glucose-stimulated L-PK expression in INS-1 insulin-secreting cells. Overexpression or dominant-negative suppression of USF1/USF2 (using tet-on inducible system) had no effect on basal or glucose-responsive endogenous L-PK mRNA, despite dramatically altering USF binding to the L-PK promoter (shown by EMSA).","method":"Tet-on inducible overexpression; dominant-negative USF mutants; quantitative Northern blot; EMSA; nuclear run-on assay; ChREBP overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — rigorous inducible system with multiple mutant constructs and orthogonal methods; directly contradicts and supersedes the 1997 Kennedy et al. finding for INS-1 cells","pmids":["12087089"],"is_preprint":false},{"year":2002,"finding":"USF-1 and USF-2 bind the E-box at −893/−888 of the murine iNOS promoter in vivo and act as transcriptional repressors of basal and IL-1β-induced iNOS expression in mesangial cells. Mutation of the E-box augmented iNOS response; cotransfection of dominant-negative USF-2 lacking the DNA-binding domain also augmented IL-1β stimulation.","method":"Site-directed mutagenesis of E-box; cotransfection reporter assays; EMSA with USF supershift antibodies; dominant-negative cotransfection","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis, reporter assay, EMSA/supershift, dominant-negative analysis, single lab","pmids":["12225970"],"is_preprint":false},{"year":2003,"finding":"USF2 (but not USF1) is a specific transcriptional activator of the IGF2R (IGF2 receptor) gene in non-tumorigenic mammary epithelial cells (MCF-10A). Both USF1 and USF2 bound IGF2R E-box elements in vitro and were present at the IGF2R promoter chromatin in vivo, but only overexpressed USF2 transactivated the IGF2R promoter. A USF dominant-negative mutant decreased IGF2R mRNA. In breast cancer cell lines (MCF-7, MDA-MB-231), IGF2R promoter activity was USF-independent.","method":"In vitro DNA binding (EMSA); ChIP; overexpression and dominant-negative transfection; Northern blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP for in vivo occupancy combined with in vitro binding, overexpression, dominant-negative, and mRNA measurement in one study","pmids":["12857727"],"is_preprint":false},{"year":2004,"finding":"USF1 and USF2 constitutively bind the class B E-box in the proximal human HO-1 promoter in vivo. Overexpression of USF1 or USF2 enhanced basal HO-1 expression; dominant-negative USF reduced HO-1 expression. A specific guanine contact point is essential for USF binding. USF proteins mediate HO-1 induction by haem and cadmium in human renal proximal tubular epithelial cells.","method":"ChIP; EMSA; dimethylsulphate in vivo footprinting; USF overexpression and dominant-negative transfection; E-box mutagenesis","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo footprinting, ChIP, EMSA, mutagenesis, and functional overexpression/dominant-negative in one study","pmids":["15242350"],"is_preprint":false},{"year":2004,"finding":"A novel USF2 isoform (USF2c), generated by alternative splicing that removes exons 4, 5, and part of exon 6, binds as a homodimer to the E-box of the cathepsin B promoter and acts as a transcriptional repressor of cathepsin B expression. USF2c (~29 kDa) is expressed in prostate and glioblastoma cancer cell lines.","method":"RT-PCR cloning; in vitro transcription/translation; EMSA; cotransfection reporter assays","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vitro translation + EMSA + reporter assay, single lab, single study","pmids":["15276216"],"is_preprint":false},{"year":2005,"finding":"Lysyl tRNA synthetase (LysRS) associates with USF2 in mast cells. Hint negatively regulates USF2, and Ap4A (synthesized by LysRS) acts as a positive regulator of USF2 activity by a mechanism similar to that described for MITF regulation by LysRS.","method":"Co-immunoprecipitation of LysRS with USF2; functional assays measuring USF2 transcriptional activity in the presence of Hint and Ap4A","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional Ap4A assays, single lab","pmids":["16199869"],"is_preprint":false},{"year":2005,"finding":"USF1 and USF2 act as repressors of the human MCT1 (monocarboxylate transporter 1) promoter via binding to the site at −114/−119. Site-directed mutagenesis and cotransfection with USF1/USF2 expression vectors confirmed the repressor role; endogenous MCT1 expression was decreased in USF2-overexpressing Caco-2 cells.","method":"EMSA; site-directed mutagenesis; cotransfection reporter assays; endogenous mRNA measurement","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA, mutagenesis, reporter, and endogenous expression assay, single lab","pmids":["15691871"],"is_preprint":false},{"year":2005,"finding":"Active USF2 overexpression inhibits c-Myc-dependent cellular transformation: in c-Myc-transformed (but not E1A-transformed) rat embryo fibroblasts, transcriptionally active USF2 reduced anchorage-independent growth, decreased tumor formation in nude mice by >30-fold, and cotransfection assays indicated USF2 acts by preventing transcriptional repression by c-Myc.","method":"Stable clone generation; soft agar colony assay; nude mouse xenograft; cotransfection with dominant-negative Myc/USF mutants","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro transformation assay plus in vivo xenograft plus genetic rescue, single lab","pmids":["15541720"],"is_preprint":false},{"year":2006,"finding":"USF2 functions as a tumor suppressor in prostate carcinogenesis. Ectopic USF2 expression in PC-3 cells inhibited anchorage-independent growth (90–98%), invasion (80%), and in vivo tumorigenicity (80–90% in nude mice). USF2-null mice developed marked prostate hyperplasia, confirming an in vivo role in normal prostate growth/differentiation.","method":"Western blot; soft agar assay; Matrigel invasion assay; nude mouse xenograft; USF2-knockout mouse generation; IHC of human prostate cancer tissues","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays, in vivo xenograft, genetic knockout mouse model, replicated in human tissue","pmids":["16186802"],"is_preprint":false},{"year":2008,"finding":"USF2 opposes HO-1 regulation in a cell-type-dependent manner: USF-2 inhibits HO-1 expression in primary hepatocytes but induces it in tumor cell lines. This differential regulation requires both an E-box and an AP-1 site in the HO-1 promoter and involves USF-2 interaction with Fra-1 (an AP-1 factor). The USF-specific region (USR) and exon 4 transactivation domain of USF-2 are required for the differential activity.","method":"Reporter assays with E-box and AP-1 site mutations; protein–protein interaction studies (co-immunoprecipitation of USF with Fra-1); USF-2 domain deletion mutants","journal":"Antioxidants & redox signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with Fra-1, promoter mutagenesis, domain deletion analysis, single lab","pmids":["18331200"],"is_preprint":false},{"year":2008,"finding":"USF1 and USF2 binding profiles across the entire human genome in a liver cell line (ChIP-chip) show that they bind predominantly near transcription start sites of protein-coding genes, that their binding positively correlates with gene expression, that they frequently co-occupy bidirectional promoters, and that USF1 preferentially binds and potentially regulates nuclear mitochondrial genes and lipid/cholesterol metabolism genes in collaboration with GABPA/NRF-2.","method":"Genome-wide ChIP-chip at 35-bp resolution in liver cell line (HepG2); correlation with gene expression data","journal":"Genome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-chip is rigorous but is a single cell-line survey without functional follow-up for individual USF2 targets","pmids":["18230803"],"is_preprint":false},{"year":2009,"finding":"DNA-binding assays (EMSA) showed that the A allele of rs1867277 in the FOXE1 5' UTR specifically recruits the USF1/USF2 transcription factor complex; transfection studies confirmed allele-dependent transcriptional regulation of FOXE1, indicating USF1/USF2 binding to this sequence drives FOXE1 expression.","method":"EMSA; supershift with USF1/USF2 antibodies; transfection reporter assays","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA with antibody supershift and functional reporter assay, single study","pmids":["19730683"],"is_preprint":false},{"year":2009,"finding":"HINT1 co-immunoprecipitates with USF2 in HepG2 cell extracts and overexpression of HINT1 inhibits USF2 transcriptional activity, reducing expression of USF2-regulated genes including cyclin D1 and TGFβ2 in hepatoma cells.","method":"Co-immunoprecipitation; reporter assays; Western blot of downstream targets","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single Co-IP and reporter assay, single lab","pmids":["19089909"],"is_preprint":false},{"year":2013,"finding":"USF2 is specifically required for activation of HIF2 target genes under hypoxia. HIF2α physically interacts with USF2 in a manner dependent on the HIF2α N-TAD (and involving both N- and C-TADs). USF2 exhibits specific binding to the promoters of HIF2 (not HIF1) target genes. Addition of functional USF2 binding sites to a HIF1 target gene promoter increases its response to HIF2+USF2 activation. RNA Pol II association with HIF2 target genes is USF2-dependent.","method":"siRNA knockdown; reporter gene assays; ChIP; co-immunoprecipitation (HIF2α–USF2 interaction) with domain-mapping mutants","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with domain mapping, ChIP, reporter assays, and RNA Pol II ChIP all in one study, multiple orthogonal methods","pmids":["23991099"],"is_preprint":false},{"year":2018,"finding":"USF2 inhibits transcription of Smurf1 and Smurf2 (negative regulators of TGF-β signaling) by binding their E-box-containing promoters both in vitro and in vivo, thereby enhancing TGF-β pathway activity.","method":"Luciferase reporter assay; ChIP; overexpression of USF2; mRNA quantification","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assays with overexpression, single lab, single study","pmids":["30244169"],"is_preprint":false},{"year":2018,"finding":"USF2 and PLAG1 co-regulate MSI2 expression in hematopoietic stem and progenitor cells: both factors bind the MSI2 promoter (confirmed by ChIP-seq), their coincident overexpression in cord blood CD34+ cells enhances MSI2 transcription and expands CD34+ cells similarly to direct MSI2 overexpression.","method":"Luciferase reporter assay; ChIP-seq; lentiviral overexpression in cord blood CD34+ cells; CD34+ cell expansion assay","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq and functional overexpression with cellular phenotype, single lab","pmids":["29641991"],"is_preprint":false},{"year":2019,"finding":"CDK5 phosphorylates USF2 at serine 155 and serine 222, stabilizing the USF2 protein and regulating cellular growth and migration.","method":"In vitro kinase assay; site-directed mutagenesis of S155 and S222; Western blot; cell growth and migration assays","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro kinase assay with mutagenesis plus cellular phenotype, single lab, single study","pmids":["31013770"],"is_preprint":false},{"year":2019,"finding":"USF2 binds the transcriptional initiation region of ATF4 and regulates ATF4 transcription; overexpression of USF2 promotes osteogenic differentiation of periodontal ligament cells (PDLCs), and simultaneous USF2 overexpression with ATF4 silencing reverses this osteogenic effect.","method":"Luciferase reporter assay; USF2 and ATF4 overexpression/silencing; qRT-PCR; Alizarin red staining","journal":"Journal of periodontal research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — reporter assay plus genetic rescue experiment, single lab","pmids":["31448831"],"is_preprint":false},{"year":2020,"finding":"USF2 acts as an upstream transcriptional regulator of proinflammatory cytokines (IL-17A, IFN-γ, IL-22, GM-CSF) and T-bet in pathogenic Th17 cells; shRNA targeting USF2 reduced expression of these cytokines in CCR6+ T cells from rheumatoid arthritis patients.","method":"shRNA knockdown of USF2 in primary human Th17 cells; gene expression analysis; gene set enrichment analysis identifying USF2 as upstream regulator","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — shRNA knockdown with defined cytokine readouts in primary human cells, single lab","pmids":["33203678"],"is_preprint":false},{"year":2021,"finding":"USF2 transcriptionally activates THBS1, promoting oxidative stress and activating TGF-β/Smad3/NLRP3/Caspase-1 signaling to stimulate pyroptosis in sepsis-induced acute kidney injury. USF2 knockdown downregulates THBS1, inhibits TGF-β/Smad3 pathway activation, and reduces pyroptosis.","method":"USF2 knockdown (siRNA); ChIP/luciferase reporter for USF2–THBS1 promoter interaction; mouse AKI model; measurement of NLRP3/Caspase-1/GSDMD-N/IL-1β/IL-18; LDH assay","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP/reporter confirming direct transcriptional regulation plus in vivo mouse model and mechanistic pathway readouts, single lab","pmids":["34756923"],"is_preprint":false},{"year":2021,"finding":"USF2 transcriptionally regulates S100A8 expression by directly binding to the S100A8 promoter; TGF-β enhances the USF2/S100A8 signaling axis in colorectal cancer cells, promoting EMT and metastasis. Luciferase reporter and ChIP assays confirmed direct USF2 binding to the S100A8 promoter.","method":"Luciferase reporter assay; ChIP; USF2/S100A8 overexpression and knockdown; in vitro migration/invasion assay; in vivo mouse metastasis model","journal":"Cancer communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter for direct binding, in vitro and in vivo functional assays, single lab","pmids":["33389821"],"is_preprint":false},{"year":2022,"finding":"USF2 directly binds two E-box sites in the TXNRD1 promoter and functions as a transcriptional suppressor of TXNRD1 in hepatocellular carcinoma; USF2 acts as a tumor suppressor through downstream repression of TXNRD1, which otherwise activates Akt/mTOR signaling by attenuating PTEN.","method":"ChIP; luciferase reporter assay; USF2 and TXNRD1 knockdown/overexpression; in vitro and in vivo functional assays; Akt/mTOR pathway readouts","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter for direct promoter binding, in vivo experiments, single lab","pmids":["36319631"],"is_preprint":false},{"year":2022,"finding":"USF2 transcriptionally activates TREM1 by binding its promoter (confirmed by luciferase reporter and ChIP assays), and USF2 knockdown reduces inflammatory cytokines (IL-6, IL-1β, TNF-α) in LPS-induced endometrial epithelial cells via the TREM1–TLR2/4–NF-κB axis.","method":"Luciferase reporter assay; ChIP; Co-IP (TREM1–TLR2/4); siRNA knockdown; ELISA","journal":"Bioengineered","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter confirm direct transcriptional activation; Co-IP for downstream binding partner; single lab","pmids":["35100093"],"is_preprint":false},{"year":2023,"finding":"USF2 is a transcriptional activator of YTHDF1; USF2 knockdown in ischemia/reperfusion-injured neurons reduces YTHDF1, which otherwise suppresses autophagy via m6A-mediated stabilization of Cdc25A (an autophagy inhibitor), thereby worsening neuronal injury. Usf2 interference improved autophagy and alleviated I/R injury in MCAO mice.","method":"Luciferase reporter (USF2 binding to YTHDF1 promoter); lentiviral Usf2 shRNA in HT22 neurons and MCAO mice; YTHDF1 overexpression rescue; m6A/Cdc25A stability assays; autophagy and apoptosis readouts","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay for direct transcriptional regulation, in vitro and in vivo genetic rescue, single lab","pmids":["37914905"],"is_preprint":false},{"year":2023,"finding":"USF2 negatively regulates STX6 transcription in hepatocellular carcinoma; STX6 facilitates autophagosome–lysosome fusion and accelerates LC3B degradation by promoting autophagic flux, promoting HCC progression downstream of USF2.","method":"Gain- and loss-of-function experiments; mechanistic reporter assays; co-localization of autophagosomes and lysosomes; in vitro and in vivo proliferation/metastasis assays","journal":"International journal of biological sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional knockdown/overexpression with cellular phenotype, limited direct mechanistic evidence for USF2–STX6 transcriptional relationship, single lab","pmids":["37564208"],"is_preprint":false},{"year":2024,"finding":"USF2 represses lysosomal and autophagy genes under nutrient-rich conditions by binding CLEAR motifs together with HDAC1, reducing histone H3K27 acetylation and restricting chromatin accessibility. Under starvation, USF2 competes with TFEB for binding to target gene promoters. GSK3β phosphorylates USF2 at serine 155, reducing its DNA-binding activity and thereby de-repressing lysosomal gene expression. This mechanism was validated as a potential therapeutic target for α1-antitrypsin deficiency.","method":"ChIP for USF2 and HDAC1 co-occupancy at CLEAR motifs; histone acetylation (H3K27ac) assays; ATAC-seq (chromatin accessibility); competitive TFEB/USF2 binding assays; GSK3β phosphorylation assay; S155 mutagenesis; starvation-dependent gene regulation assays; disease model validation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (ChIP, ATAC-seq, phosphorylation/mutagenesis, competitive binding) in a single rigorous study with disease model validation","pmids":["39333072"],"is_preprint":false}],"current_model":"USF2 is a bHLH-leucine zipper transcription factor that binds E-box (CANNTG) and CLEAR motifs in target gene promoters, recruiting co-activators (p300) or co-repressors (HDAC1) to activate or repress transcription depending on cellular context; its activity is regulated by CDK5-mediated phosphorylation at S155/S222 (stabilizing the protein) and GSK3β-mediated phosphorylation at S155 (reducing DNA binding to de-repress lysosomal/autophagy genes under starvation), nuclear translocation is induced by mast cell activation signals and involves both its basic region and the conserved USF-specific region (USR), and it interacts with partners including HIF2α (to specify HIF2 target gene activation), Fra-1 (modulating HO-1 regulation), LysRS/Ap4A (regulating transcriptional activity), and HINT1 (inhibiting USF2 activity), with established roles in suppressing tumorigenesis, regulating lysosomal/autophagy homeostasis, controlling inflammatory cytokine production in Th17 cells, and governing expression of targets including IGF2R, TXNRD1, THBS1, S100A8, Smurf1/2, TREM1, STX6, and HOXB4."},"narrative":{"mechanistic_narrative":"USF2 is a basic-helix-loop-helix leucine-zipper transcription factor that binds E-box (CANNTG) and CLEAR motifs in target promoters to either activate or repress transcription in a context- and partner-dependent manner [PMID:12857727, PMID:15242350, PMID:39333072]. Its activity is governed by two transactivation domains (the USF-specific region/USR and an exon 5-encoded region) and two nuclear localization signals residing in the basic region and the USR [PMID:8657110], and nuclear translocation is inducibly triggered in mast cells by IL-3 or IgE-antigen activation signals to support cell survival [PMID:9743349]. Transcriptional output is set by recruited cofactors and binding partners: USF2 engages the coactivator p300 to drive activation [PMID:10434034], partners with HDAC1 at CLEAR motifs to repress lysosomal/autophagy genes and lower H3K27 acetylation under nutrient-rich conditions, then is overridden under starvation when GSK3β phosphorylates Ser155 to reduce DNA binding and de-repress these genes in competition with TFEB [PMID:39333072], and physically associates with HIF2α to confer HIF2-specific (versus HIF1) target-gene activation and Pol II recruitment under hypoxia [PMID:23991099]. USF2 is itself stabilized by CDK5 phosphorylation at Ser155/Ser222 [PMID:31013770] and is negatively regulated by HINT1 binding [PMID:19089909] and modulated by a LysRS/Ap4A axis [PMID:16199869]. Functionally, USF2 behaves as a tumor suppressor: it restrains c-Myc-dependent and prostate carcinogenesis, with USF2-null mice developing prostate hyperplasia [PMID:15541720, PMID:16186802], and it represses oncogenic targets such as TXNRD1 in hepatocellular carcinoma [PMID:36319631]. It directly governs an extensive target repertoire including IGF2R, HO-1, Smurf1/2, THBS1, S100A8, TREM1, and HOXB4, linking it to autophagy/lysosomal homeostasis, TGF-β signaling, inflammation, and hematopoietic self-renewal [PMID:12857727, PMID:15242350, PMID:30244169, PMID:34756923, PMID:33389821, PMID:35100093, PMID:11085749]. USF2 also acts as an upstream regulator of proinflammatory cytokine production in pathogenic Th17 cells [PMID:33203678].","teleology":[{"year":1996,"claim":"Establishing the domain architecture answered how USF2 partitions its activation and nuclear-targeting functions, defining the USR and exon 5 region as transactivation domains and identifying two distinct NLSs.","evidence":"Immunofluorescence and GAL4/USF2 fusion reporter assays with deletion mutants in transfected cells","pmids":["8657110"],"confidence":"High","gaps":["Did not address endogenous target genes","Context-restricted USR activation mechanism not fully resolved"]},{"year":1997,"claim":"Early studies tested whether USF2 mediates glucose-responsive metabolic gene transcription and whether it heterodimerizes beyond its own family, implicating it in L-PK activation and in inhibiting c-Maf DNA binding.","evidence":"Antibody microinjection with L4-box mutant reporters in living beta-cells; yeast two-hybrid and gel-shift with c-Maf","pmids":["9252379","9070273"],"confidence":"Medium","gaps":["L-PK role later contradicted in INS-1 cells","c-Maf interaction shown only in vitro/yeast"]},{"year":1998,"claim":"Linking nuclear translocation to a cellular outcome showed that USF2 nuclear entry, driven through its USR-derived NLS, is required for IL-3-mediated mast cell survival.","evidence":"Subcellular fractionation and NLS-peptide inhibition with cell viability readout in mast cells","pmids":["9743349"],"confidence":"Medium","gaps":["Downstream survival genes not identified","Single lab/system"]},{"year":1999,"claim":"Identifying p300 as the coactivator answered how USF2 transactivates through initiator elements, defining a coactivator-dependent activation mechanism.","evidence":"Cotransfection reporter assays with E1A mutants and p300 rescue on the ATPA promoter","pmids":["10434034"],"confidence":"Medium","gaps":["Direct USF2-p300 binding not mapped","Promoter-specific generalization untested"]},{"year":2000,"claim":"Genome-promoter binding surveys established USF1/USF2 as direct regulators across diverse promoters (FMR1, APC, FcεRI, HOXB4) and showed methylation can block their binding.","evidence":"EMSA with tissue extracts, methylation interference, yeast one-hybrid, and reporter assays across multiple promoters","pmids":["11058604","11241666","11180124","11085749"],"confidence":"Medium","gaps":["USF1 vs USF2 specificity not resolved at most promoters","Largely correlative for endogenous regulation"]},{"year":2002,"claim":"A rigorous inducible system overturned the earlier L-PK model, showing ChREBP rather than USF mediates glucose-responsive L-PK expression and clarifying the limits of USF2's metabolic role.","evidence":"Tet-on overexpression/dominant-negative, Northern blot, EMSA, nuclear run-on in INS-1 cells","pmids":["12087089"],"confidence":"High","gaps":["Does not exclude USF2 metabolic roles in other tissues","Mechanism of dispensability at the bound promoter unexplained"]},{"year":2003,"claim":"Comparing USF1 and USF2 at IGF2R revealed paralog-specific activation, showing USF2 (not USF1) transactivates despite both occupying the promoter, and that this is lost in breast cancer cells.","evidence":"EMSA, ChIP, overexpression/dominant-negative, and Northern blot in mammary epithelial vs cancer lines","pmids":["12857727"],"confidence":"High","gaps":["Molecular basis of USF2-specific activation unresolved","Cause of USF-independence in cancer cells unknown"]},{"year":2004,"claim":"Studies of HO-1 and a repressive splice isoform established that USF2 output is bidirectional and isoform-dependent, with USF2c acting as a homodimeric repressor.","evidence":"ChIP, in vivo footprinting, EMSA on HO-1; RT-PCR cloning, in vitro translation, and reporter assays for USF2c","pmids":["15242350","15276216"],"confidence":"High","gaps":["Switch between activation and repression not mechanistically defined","USF2c tissue distribution and physiological role limited"]},{"year":2005,"claim":"Regulatory inputs and additional repressive targets were defined: a LysRS/Hint/Ap4A axis tunes USF2 activity, USF2 represses MCT1, and active USF2 suppresses c-Myc-driven transformation.","evidence":"Co-IP of LysRS with USF2 plus Ap4A functional assays; MCT1 EMSA/reporter; soft agar and nude mouse assays for c-Myc transformation","pmids":["16199869","15691871","15541720"],"confidence":"Medium","gaps":["LysRS/Ap4A mechanism inferred by analogy to MITF","Anti-transformation mechanism only partially mapped"]},{"year":2006,"claim":"Genetic and xenograft evidence established USF2 as a bona fide tumor suppressor in prostate, with knockout mice developing prostate hyperplasia.","evidence":"Soft agar, invasion, xenograft assays in PC-3, USF2-knockout mouse, and human tissue IHC","pmids":["16186802"],"confidence":"High","gaps":["Tumor-suppressive target genes in prostate not fully defined","Mechanism of hyperplasia in knockout unresolved"]},{"year":2008,"claim":"The cell-type-dependent reversal of HO-1 regulation was explained by USF2's partnership with the AP-1 factor Fra-1 and its requirement for both E-box and AP-1 sites plus the USR/exon 4 domains.","evidence":"Promoter mutagenesis, Co-IP with Fra-1, and domain-deletion analysis in hepatocytes vs tumor lines","pmids":["18331200"],"confidence":"Medium","gaps":["Determinants selecting activation vs repression per cell type unresolved","Single lab"]},{"year":2008,"claim":"Genome-wide mapping placed USF1/USF2 binding predominantly at active transcription start sites and bidirectional promoters, framing them as broad promoter-proximal regulators.","evidence":"ChIP-chip at 35-bp resolution in HepG2 correlated with expression data","pmids":["18230803"],"confidence":"Medium","gaps":["No functional follow-up for individual USF2 targets","Single cell line"]},{"year":2009,"claim":"Negative regulation by HINT1 and allele-specific recruitment at FOXE1 refined understanding of USF2 control and its role in disease-associated variants.","evidence":"Co-IP and reporter assays for HINT1; EMSA supershift and allele-specific reporter at FOXE1 rs1867277","pmids":["19089909","19730683"],"confidence":"Medium","gaps":["HINT1 inhibition mechanism not structurally defined","FOXE1 regulation shown largely in vitro"]},{"year":2013,"claim":"Identifying the HIF2α interaction answered how HIF2 versus HIF1 target-gene specificity is achieved, showing USF2 is required for HIF2 target activation and Pol II recruitment under hypoxia.","evidence":"siRNA, ChIP, reporter assays, and Co-IP with HIF2α domain-mapping mutants","pmids":["23991099"],"confidence":"High","gaps":["Structural basis of HIF2α-USF2 contact not resolved","In vivo relevance across tissues untested"]},{"year":2018,"claim":"USF2 was linked to TGF-β signaling and hematopoietic self-renewal by repressing Smurf1/2 and co-activating MSI2 with PLAG1.","evidence":"ChIP/ChIP-seq, reporter assays, and overexpression with CD34+ expansion phenotype","pmids":["30244169","29641991"],"confidence":"Medium","gaps":["Direct vs indirect contribution to TGF-β output not fully separated","Single lab per study"]},{"year":2019,"claim":"Post-translational and target-level mechanisms advanced: CDK5 phosphorylation at S155/S222 stabilizes USF2, and USF2 directly regulates ATF4 to drive osteogenic differentiation.","evidence":"In vitro kinase assay with S155/S222 mutagenesis; reporter assays and ATF4 silencing rescue in periodontal ligament cells","pmids":["31013770","31448831"],"confidence":"Medium","gaps":["How S155/S222 phosphorylation stabilizes the protein unresolved","Single-lab phenotypes"]},{"year":2020,"claim":"USF2 was established as an upstream regulator of pathogenic Th17 cytokine programs, extending its role to inflammation.","evidence":"shRNA knockdown in primary human CCR6+ Th17 cells with cytokine readouts and GSEA","pmids":["33203678"],"confidence":"Medium","gaps":["Direct USF2 target promoters in Th17 cells not mapped","Mechanism upstream of cytokine genes inferred"]},{"year":2021,"claim":"Disease-context studies defined USF2-driven transcriptional axes (THBS1, S100A8) that promote pyroptosis/AKI and colorectal EMT/metastasis via TGF-β signaling.","evidence":"ChIP/reporter for direct binding plus in vitro and in vivo functional models","pmids":["34756923","33389821"],"confidence":"Medium","gaps":["Context that switches USF2 between tumor-suppressive and pro-metastatic roles unresolved","Single lab per target"]},{"year":2022,"claim":"USF2's tumor-suppressive output was further mechanized through direct repression of TXNRD1 (gating Akt/mTOR via PTEN) and activation of TREM1 in inflammation.","evidence":"ChIP and reporter assays for direct promoter binding with knockdown/overexpression and pathway readouts","pmids":["36319631","35100093"],"confidence":"Medium","gaps":["Determinants of repressor vs activator role at different promoters unresolved","Single lab per study"]},{"year":2023,"claim":"USF2 was tied to autophagy regulation through transcriptional control of YTHDF1 and STX6, linking it to neuronal I/R injury and HCC autophagic flux.","evidence":"Reporter assays and genetic rescue in neurons/HCC models with autophagy readouts","pmids":["37914905","37564208"],"confidence":"Medium","gaps":["STX6 transcriptional link supported by limited direct evidence (Low confidence)","Direct vs indirect autophagy control not fully separated"]},{"year":2024,"claim":"A unifying mechanism for autophagy/lysosomal control was established: USF2 represses CLEAR-motif genes with HDAC1 under nutrient-rich conditions, and GSK3β phosphorylation at S155 de-represses them under starvation in competition with TFEB.","evidence":"ChIP for USF2/HDAC1 co-occupancy, H3K27ac and ATAC-seq, competitive TFEB binding, GSK3β phosphorylation, S155 mutagenesis, and disease-model validation","pmids":["39333072"],"confidence":"High","gaps":["How S155 phosphorylation by GSK3β versus CDK5 produces opposite functional outcomes unresolved","Generality of TFEB competition across cell types untested"]},{"year":null,"claim":"What molecular features dictate USF2's switch between activator and repressor (cofactor identity, partner, post-translational state) across cell types remains the central unresolved question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of context-dependent cofactor selection","Conflicting S155 phosphorylation outcomes (CDK5 stabilizing vs GSK3β inhibiting) not reconciled","USF1 vs USF2 paralog division of labor incompletely defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,6,11,12,16,22,30,34]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[11,12,22,23,30,34]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,14,21]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,3]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[12,22,34]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,11,12,22,34]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[32,33,34]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[34]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[16,17,28,29,30]}],"complexes":[],"partners":["USF1","HIF2A","FOSL1","HINT1","KARS1","P300","HDAC1","C-MAF"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15853","full_name":"Upstream stimulatory factor 2","aliases":["Class B basic helix-loop-helix protein 12","bHLHb12","FOS-interacting protein","FIP","Major late transcription factor 2","Upstream transcription factor 2"],"length_aa":346,"mass_kda":37.0,"function":"Transcription factor that binds to a symmetrical DNA sequence (E-boxes) (5'-CACGTG-3') that is found in a variety of viral and cellular promoters","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q15853/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/USF2","classification":"Not Classified","n_dependent_lines":323,"n_total_lines":1208,"dependency_fraction":0.2673841059602649},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/USF2","total_profiled":1310},"omim":[{"mim_id":"612822","title":"UTP20 SMALL SUBUNIT PROCESSOME COMPONENT; UTP20","url":"https://www.omim.org/entry/612822"},{"mim_id":"606464","title":"HEPCIDIN ANTIMICROBIAL PEPTIDE; HAMP","url":"https://www.omim.org/entry/606464"},{"mim_id":"602868","title":"CELL DIVISION CYCLE 5-LIKE; CDC5L","url":"https://www.omim.org/entry/602868"},{"mim_id":"601728","title":"PHOSPHATASE AND TENSIN HOMOLOG; PTEN","url":"https://www.omim.org/entry/601728"},{"mim_id":"600390","title":"UPSTREAM TRANSCRIPTION FACTOR 2, FOS-INTERACTING; USF2","url":"https://www.omim.org/entry/600390"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/USF2"},"hgnc":{"alias_symbol":["FIP","bHLHb12"],"prev_symbol":[]},"alphafold":{"accession":"Q15853","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15853","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15853-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15853-F1-predicted_aligned_error_v6.png","plddt_mean":58.47},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=USF2","jax_strain_url":"https://www.jax.org/strain/search?query=USF2"},"sequence":{"accession":"Q15853","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15853.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15853/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15853"}},"corpus_meta":[{"pmid":"6384177","id":"PMC_6384177","title":"Replacement of the fip gene of Escherichia coli by an inactive gene cloned on a plasmid.","date":"1984","source":"Journal of 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Section D, Biological crystallography","url":"https://pubmed.ncbi.nlm.nih.gov/11679765","citation_count":17,"is_preprint":false},{"pmid":"28202377","id":"PMC_28202377","title":"Characterization of a new fungal immunomodulatory protein, FIP-dsq2 from Dichomitus squalens.","date":"2017","source":"Journal of biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/28202377","citation_count":16,"is_preprint":false},{"pmid":"24682474","id":"PMC_24682474","title":"Production and functional characterization of a novel fungal immunomodulatory protein FIP-SN15 shuffled from two genes of Ganoderma species.","date":"2014","source":"Applied microbiology and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/24682474","citation_count":16,"is_preprint":false},{"pmid":"25131377","id":"PMC_25131377","title":"Alleviation of respiratory syncytial virus replication and inflammation by fungal immunomodulatory protein FIP-fve from Flammulina velutipes.","date":"2014","source":"Antiviral research","url":"https://pubmed.ncbi.nlm.nih.gov/25131377","citation_count":16,"is_preprint":false},{"pmid":"17188823","id":"PMC_17188823","title":"Absence of surface expression of feline infectious peritonitis virus (FIPV) antigens on infected cells isolated from cats with FIP.","date":"2006","source":"Veterinary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/17188823","citation_count":16,"is_preprint":false},{"pmid":"21556691","id":"PMC_21556691","title":"Characterization of an immunomodulatory Der p 2-FIP-fve fusion protein produced in transformed rice suspension cell culture.","date":"2011","source":"Transgenic research","url":"https://pubmed.ncbi.nlm.nih.gov/21556691","citation_count":15,"is_preprint":false},{"pmid":"11444880","id":"PMC_11444880","title":"Sites on FIP-3 (NEMO/IKKgamma) essential for its phosphorylation and NF-kappaB modulating activity.","date":"2001","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/11444880","citation_count":15,"is_preprint":false},{"pmid":"9743349","id":"PMC_9743349","title":"Nuclear translocation of upstream stimulating factor 2 (USF2) in activated mast cells: a possible role in their survival.","date":"1998","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/9743349","citation_count":15,"is_preprint":false},{"pmid":"37914905","id":"PMC_37914905","title":"Usf2 Deficiency Promotes Autophagy to Alleviate Cerebral Ischemia-Reperfusion Injury Through Suppressing YTHDF1-m6A-Mediated Cdc25A Translation.","date":"2023","source":"Molecular neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/37914905","citation_count":14,"is_preprint":false},{"pmid":"35100093","id":"PMC_35100093","title":"Upstream stimulatory factor 2 (USF2) induced upregulation of triggering receptor expressed on myeloid cells 1 (TREM1) promotes endometritis by regulating toll-like receptor (TLR) 2/4-nuclear factor-kappaB (NF-κB) signaling pathway.","date":"2022","source":"Bioengineered","url":"https://pubmed.ncbi.nlm.nih.gov/35100093","citation_count":14,"is_preprint":false},{"pmid":"15276216","id":"PMC_15276216","title":"Isolation of a novel USF2 isoform: repressor of cathepsin B expression.","date":"2004","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/15276216","citation_count":14,"is_preprint":false},{"pmid":"28078399","id":"PMC_28078399","title":"FIP-sch2, a new fungal immunomodulatory protein from Stachybotrys chlorohalonata, suppresses proliferation and migration in lung cancer cells.","date":"2017","source":"Applied microbiology and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/28078399","citation_count":14,"is_preprint":false},{"pmid":"37341818","id":"PMC_37341818","title":"Knockdown of USF2 inhibits pyroptosis of podocytes and attenuates kidney injury in lupus nephritis.","date":"2023","source":"Journal of molecular histology","url":"https://pubmed.ncbi.nlm.nih.gov/37341818","citation_count":13,"is_preprint":false},{"pmid":"21921026","id":"PMC_21921026","title":"ID1 inhibits USF2 and blocks TGF-β-induced apoptosis in mesangial cells.","date":"2011","source":"American journal of physiology. 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Two transcriptional activation domains were identified: the USR and an exon 5-encoded region. The USR activates transcription only in its natural context upstream of the USF2 basic region and only with reporter constructs containing the adenovirus major late minimal promoter (not E1b minimal promoter), unless an initiator element is inserted downstream of the TATA box. The exon 4-encoded region modulates the potency of the exon 5 activation domain.\",\n      \"method\": \"Indirect immunofluorescence with transiently transfected cells; cotransfection assays with deletion mutants fused to USF2 or GAL4 DNA-binding domains; reporter gene assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple deletion mutants, two independent reporter systems, and localization studies in a single rigorous study\",\n      \"pmids\": [\"8657110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"USF2 activity is required for glucose-stimulated L-pyruvate kinase (L-PK) promoter activity in single living islet beta-cells. Microinjection of anti-USF2 antibodies inhibited L-PK promoter activity by 71–87% at high glucose, and the effect was dependent on an intact L4 box (E-box elements at −165 and −154 bp).\",\n      \"method\": \"Photon-counting digital imaging of firefly luciferase in single living cells; microinjection of USF2-specific antibodies; reporter constructs with mutated L4 box\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, antibody microinjection plus reporter assay with mutant constructs; later contradicted by Wang & Wollheim 2002\",\n      \"pmids\": [\"9252379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"USF2 (FIP) interacts with the bZip transcription factor c-Maf via its bHLH domain. USF2 mutants lacking the leucine zipper formed heterodimers with c-Maf but did not homodimerize; deletion of the basic region or mutation of helices abolished c-Maf binding without affecting homodimerization. In the presence of USF2, the DNA binding activity of c-Maf was markedly reduced, suggesting a tetrameric USF2–c-Maf complex that inhibits c-Maf DNA binding.\",\n      \"method\": \"Yeast two-hybrid; in vitro binding with USF2 deletion/point mutants; gel-shift DNA binding assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — yeast two-hybrid plus in vitro binding assays, single lab, single study\",\n      \"pmids\": [\"9070273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"USF2 undergoes nuclear translocation in mast cells upon activation by IL-3 or IgE–antigen crosslinking. Prevention of USF2 nuclear translocation using a peptide derived from the USF-specific NLS region significantly inhibited IL-3-mediated mast cell survival, linking USF2 nuclear entry to cell viability.\",\n      \"method\": \"Subcellular fractionation; peptide inhibition of nuclear translocation; cell viability assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct localization experiment with functional consequence (cell survival), single lab, single study\",\n      \"pmids\": [\"9743349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"USF2-dependent transcriptional activation of the F1F0 ATP synthase alpha-subunit (ATPA) initiator element is mediated by the coactivator p300. Wild-type adenovirus E1A (which binds p300) inhibited USF2-dependent ATPA transactivation, whereas E1A mutants lacking p300-binding sites did not; overexpression of p300 reversed E1A inhibition.\",\n      \"method\": \"Cotransfection reporter assays; E1A mutant analysis; p300 overexpression rescue experiments\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter assays with E1A mutants and p300 overexpression, multiple orthogonal approaches, single lab\",\n      \"pmids\": [\"10434034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"USF1 and USF2 are the major transcription factors binding the FMR1 promoter in brain and testis extracts. Methylation of the FMR1 promoter reduces USF1/USF2 binding (to a lesser degree than its abolition of alpha-Pal/NRF-1 binding), suggesting methylation inhibits FMR1 transcription partly by blocking USF factor binding.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA) with brain/testis nuclear extracts; identification of conserved binding sites; methylation interference assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA with tissue extracts and methylation interference, single lab, two orthogonal methods\",\n      \"pmids\": [\"11058604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"USF1 and USF2 bind to E-box elements in the APC tumor suppressor gene promoter (preferentially the E-box B site) and activate APC transcription. Mutation of E-box B completely abolished basal APC promoter activity; ectopic USF1/USF2 expression activated the APC promoter in HCT-116 cells.\",\n      \"method\": \"Transient transfection reporter assays; E-box site-directed mutagenesis; cotransfection with USF1/USF2 expression vectors\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — reporter assays with mutagenesis, single lab, single study\",\n      \"pmids\": [\"11241666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"USF1/USF2 heterodimer activates the human FcεRI alpha chain gene by binding a CAGCTG E-box element in the first intron. Overexpression of USF2 antisense repressed the FcεRI alpha chain promoter and decreased alpha chain mRNA in mast cell lines.\",\n      \"method\": \"EMSA with antibodies and in vitro translation products; USF2 antisense overexpression; promoter-reporter assays\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA, antisense knockdown, reporter assays, single lab\",\n      \"pmids\": [\"11180124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"USF-2 and USF-1 co-activate the HOXB4 promoter through an E-box (HXRE-2) in hematopoietic stem cells and K562 cells via the MAP kinase pathway, promoting stem cell self-renewal. MITF bound the same E-box but did not activate the HOXB4 promoter. USF-2 was identified by yeast one-hybrid screening of bone marrow and K562 libraries.\",\n      \"method\": \"Yeast one-hybrid assay; EMSA with K562 nuclear extracts; cotransfection in K562 and CD34+ cells; MAP kinase pathway inhibitor experiments\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast one-hybrid, EMSA, cotransfection assays with pathway inhibition, single lab\",\n      \"pmids\": [\"11085749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ChREBP, not USF2, mediates glucose-stimulated L-PK expression in INS-1 insulin-secreting cells. Overexpression or dominant-negative suppression of USF1/USF2 (using tet-on inducible system) had no effect on basal or glucose-responsive endogenous L-PK mRNA, despite dramatically altering USF binding to the L-PK promoter (shown by EMSA).\",\n      \"method\": \"Tet-on inducible overexpression; dominant-negative USF mutants; quantitative Northern blot; EMSA; nuclear run-on assay; ChREBP overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — rigorous inducible system with multiple mutant constructs and orthogonal methods; directly contradicts and supersedes the 1997 Kennedy et al. finding for INS-1 cells\",\n      \"pmids\": [\"12087089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"USF-1 and USF-2 bind the E-box at −893/−888 of the murine iNOS promoter in vivo and act as transcriptional repressors of basal and IL-1β-induced iNOS expression in mesangial cells. Mutation of the E-box augmented iNOS response; cotransfection of dominant-negative USF-2 lacking the DNA-binding domain also augmented IL-1β stimulation.\",\n      \"method\": \"Site-directed mutagenesis of E-box; cotransfection reporter assays; EMSA with USF supershift antibodies; dominant-negative cotransfection\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis, reporter assay, EMSA/supershift, dominant-negative analysis, single lab\",\n      \"pmids\": [\"12225970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"USF2 (but not USF1) is a specific transcriptional activator of the IGF2R (IGF2 receptor) gene in non-tumorigenic mammary epithelial cells (MCF-10A). Both USF1 and USF2 bound IGF2R E-box elements in vitro and were present at the IGF2R promoter chromatin in vivo, but only overexpressed USF2 transactivated the IGF2R promoter. A USF dominant-negative mutant decreased IGF2R mRNA. In breast cancer cell lines (MCF-7, MDA-MB-231), IGF2R promoter activity was USF-independent.\",\n      \"method\": \"In vitro DNA binding (EMSA); ChIP; overexpression and dominant-negative transfection; Northern blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP for in vivo occupancy combined with in vitro binding, overexpression, dominant-negative, and mRNA measurement in one study\",\n      \"pmids\": [\"12857727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"USF1 and USF2 constitutively bind the class B E-box in the proximal human HO-1 promoter in vivo. Overexpression of USF1 or USF2 enhanced basal HO-1 expression; dominant-negative USF reduced HO-1 expression. A specific guanine contact point is essential for USF binding. USF proteins mediate HO-1 induction by haem and cadmium in human renal proximal tubular epithelial cells.\",\n      \"method\": \"ChIP; EMSA; dimethylsulphate in vivo footprinting; USF overexpression and dominant-negative transfection; E-box mutagenesis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo footprinting, ChIP, EMSA, mutagenesis, and functional overexpression/dominant-negative in one study\",\n      \"pmids\": [\"15242350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A novel USF2 isoform (USF2c), generated by alternative splicing that removes exons 4, 5, and part of exon 6, binds as a homodimer to the E-box of the cathepsin B promoter and acts as a transcriptional repressor of cathepsin B expression. USF2c (~29 kDa) is expressed in prostate and glioblastoma cancer cell lines.\",\n      \"method\": \"RT-PCR cloning; in vitro transcription/translation; EMSA; cotransfection reporter assays\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vitro translation + EMSA + reporter assay, single lab, single study\",\n      \"pmids\": [\"15276216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Lysyl tRNA synthetase (LysRS) associates with USF2 in mast cells. Hint negatively regulates USF2, and Ap4A (synthesized by LysRS) acts as a positive regulator of USF2 activity by a mechanism similar to that described for MITF regulation by LysRS.\",\n      \"method\": \"Co-immunoprecipitation of LysRS with USF2; functional assays measuring USF2 transcriptional activity in the presence of Hint and Ap4A\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional Ap4A assays, single lab\",\n      \"pmids\": [\"16199869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"USF1 and USF2 act as repressors of the human MCT1 (monocarboxylate transporter 1) promoter via binding to the site at −114/−119. Site-directed mutagenesis and cotransfection with USF1/USF2 expression vectors confirmed the repressor role; endogenous MCT1 expression was decreased in USF2-overexpressing Caco-2 cells.\",\n      \"method\": \"EMSA; site-directed mutagenesis; cotransfection reporter assays; endogenous mRNA measurement\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA, mutagenesis, reporter, and endogenous expression assay, single lab\",\n      \"pmids\": [\"15691871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Active USF2 overexpression inhibits c-Myc-dependent cellular transformation: in c-Myc-transformed (but not E1A-transformed) rat embryo fibroblasts, transcriptionally active USF2 reduced anchorage-independent growth, decreased tumor formation in nude mice by >30-fold, and cotransfection assays indicated USF2 acts by preventing transcriptional repression by c-Myc.\",\n      \"method\": \"Stable clone generation; soft agar colony assay; nude mouse xenograft; cotransfection with dominant-negative Myc/USF mutants\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro transformation assay plus in vivo xenograft plus genetic rescue, single lab\",\n      \"pmids\": [\"15541720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"USF2 functions as a tumor suppressor in prostate carcinogenesis. Ectopic USF2 expression in PC-3 cells inhibited anchorage-independent growth (90–98%), invasion (80%), and in vivo tumorigenicity (80–90% in nude mice). USF2-null mice developed marked prostate hyperplasia, confirming an in vivo role in normal prostate growth/differentiation.\",\n      \"method\": \"Western blot; soft agar assay; Matrigel invasion assay; nude mouse xenograft; USF2-knockout mouse generation; IHC of human prostate cancer tissues\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays, in vivo xenograft, genetic knockout mouse model, replicated in human tissue\",\n      \"pmids\": [\"16186802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"USF2 opposes HO-1 regulation in a cell-type-dependent manner: USF-2 inhibits HO-1 expression in primary hepatocytes but induces it in tumor cell lines. This differential regulation requires both an E-box and an AP-1 site in the HO-1 promoter and involves USF-2 interaction with Fra-1 (an AP-1 factor). The USF-specific region (USR) and exon 4 transactivation domain of USF-2 are required for the differential activity.\",\n      \"method\": \"Reporter assays with E-box and AP-1 site mutations; protein–protein interaction studies (co-immunoprecipitation of USF with Fra-1); USF-2 domain deletion mutants\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with Fra-1, promoter mutagenesis, domain deletion analysis, single lab\",\n      \"pmids\": [\"18331200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"USF1 and USF2 binding profiles across the entire human genome in a liver cell line (ChIP-chip) show that they bind predominantly near transcription start sites of protein-coding genes, that their binding positively correlates with gene expression, that they frequently co-occupy bidirectional promoters, and that USF1 preferentially binds and potentially regulates nuclear mitochondrial genes and lipid/cholesterol metabolism genes in collaboration with GABPA/NRF-2.\",\n      \"method\": \"Genome-wide ChIP-chip at 35-bp resolution in liver cell line (HepG2); correlation with gene expression data\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-chip is rigorous but is a single cell-line survey without functional follow-up for individual USF2 targets\",\n      \"pmids\": [\"18230803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"DNA-binding assays (EMSA) showed that the A allele of rs1867277 in the FOXE1 5' UTR specifically recruits the USF1/USF2 transcription factor complex; transfection studies confirmed allele-dependent transcriptional regulation of FOXE1, indicating USF1/USF2 binding to this sequence drives FOXE1 expression.\",\n      \"method\": \"EMSA; supershift with USF1/USF2 antibodies; transfection reporter assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA with antibody supershift and functional reporter assay, single study\",\n      \"pmids\": [\"19730683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HINT1 co-immunoprecipitates with USF2 in HepG2 cell extracts and overexpression of HINT1 inhibits USF2 transcriptional activity, reducing expression of USF2-regulated genes including cyclin D1 and TGFβ2 in hepatoma cells.\",\n      \"method\": \"Co-immunoprecipitation; reporter assays; Western blot of downstream targets\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP and reporter assay, single lab\",\n      \"pmids\": [\"19089909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"USF2 is specifically required for activation of HIF2 target genes under hypoxia. HIF2α physically interacts with USF2 in a manner dependent on the HIF2α N-TAD (and involving both N- and C-TADs). USF2 exhibits specific binding to the promoters of HIF2 (not HIF1) target genes. Addition of functional USF2 binding sites to a HIF1 target gene promoter increases its response to HIF2+USF2 activation. RNA Pol II association with HIF2 target genes is USF2-dependent.\",\n      \"method\": \"siRNA knockdown; reporter gene assays; ChIP; co-immunoprecipitation (HIF2α–USF2 interaction) with domain-mapping mutants\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with domain mapping, ChIP, reporter assays, and RNA Pol II ChIP all in one study, multiple orthogonal methods\",\n      \"pmids\": [\"23991099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USF2 inhibits transcription of Smurf1 and Smurf2 (negative regulators of TGF-β signaling) by binding their E-box-containing promoters both in vitro and in vivo, thereby enhancing TGF-β pathway activity.\",\n      \"method\": \"Luciferase reporter assay; ChIP; overexpression of USF2; mRNA quantification\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assays with overexpression, single lab, single study\",\n      \"pmids\": [\"30244169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USF2 and PLAG1 co-regulate MSI2 expression in hematopoietic stem and progenitor cells: both factors bind the MSI2 promoter (confirmed by ChIP-seq), their coincident overexpression in cord blood CD34+ cells enhances MSI2 transcription and expands CD34+ cells similarly to direct MSI2 overexpression.\",\n      \"method\": \"Luciferase reporter assay; ChIP-seq; lentiviral overexpression in cord blood CD34+ cells; CD34+ cell expansion assay\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq and functional overexpression with cellular phenotype, single lab\",\n      \"pmids\": [\"29641991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK5 phosphorylates USF2 at serine 155 and serine 222, stabilizing the USF2 protein and regulating cellular growth and migration.\",\n      \"method\": \"In vitro kinase assay; site-directed mutagenesis of S155 and S222; Western blot; cell growth and migration assays\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro kinase assay with mutagenesis plus cellular phenotype, single lab, single study\",\n      \"pmids\": [\"31013770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"USF2 binds the transcriptional initiation region of ATF4 and regulates ATF4 transcription; overexpression of USF2 promotes osteogenic differentiation of periodontal ligament cells (PDLCs), and simultaneous USF2 overexpression with ATF4 silencing reverses this osteogenic effect.\",\n      \"method\": \"Luciferase reporter assay; USF2 and ATF4 overexpression/silencing; qRT-PCR; Alizarin red staining\",\n      \"journal\": \"Journal of periodontal research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — reporter assay plus genetic rescue experiment, single lab\",\n      \"pmids\": [\"31448831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USF2 acts as an upstream transcriptional regulator of proinflammatory cytokines (IL-17A, IFN-γ, IL-22, GM-CSF) and T-bet in pathogenic Th17 cells; shRNA targeting USF2 reduced expression of these cytokines in CCR6+ T cells from rheumatoid arthritis patients.\",\n      \"method\": \"shRNA knockdown of USF2 in primary human Th17 cells; gene expression analysis; gene set enrichment analysis identifying USF2 as upstream regulator\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — shRNA knockdown with defined cytokine readouts in primary human cells, single lab\",\n      \"pmids\": [\"33203678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USF2 transcriptionally activates THBS1, promoting oxidative stress and activating TGF-β/Smad3/NLRP3/Caspase-1 signaling to stimulate pyroptosis in sepsis-induced acute kidney injury. USF2 knockdown downregulates THBS1, inhibits TGF-β/Smad3 pathway activation, and reduces pyroptosis.\",\n      \"method\": \"USF2 knockdown (siRNA); ChIP/luciferase reporter for USF2–THBS1 promoter interaction; mouse AKI model; measurement of NLRP3/Caspase-1/GSDMD-N/IL-1β/IL-18; LDH assay\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP/reporter confirming direct transcriptional regulation plus in vivo mouse model and mechanistic pathway readouts, single lab\",\n      \"pmids\": [\"34756923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USF2 transcriptionally regulates S100A8 expression by directly binding to the S100A8 promoter; TGF-β enhances the USF2/S100A8 signaling axis in colorectal cancer cells, promoting EMT and metastasis. Luciferase reporter and ChIP assays confirmed direct USF2 binding to the S100A8 promoter.\",\n      \"method\": \"Luciferase reporter assay; ChIP; USF2/S100A8 overexpression and knockdown; in vitro migration/invasion assay; in vivo mouse metastasis model\",\n      \"journal\": \"Cancer communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter for direct binding, in vitro and in vivo functional assays, single lab\",\n      \"pmids\": [\"33389821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USF2 directly binds two E-box sites in the TXNRD1 promoter and functions as a transcriptional suppressor of TXNRD1 in hepatocellular carcinoma; USF2 acts as a tumor suppressor through downstream repression of TXNRD1, which otherwise activates Akt/mTOR signaling by attenuating PTEN.\",\n      \"method\": \"ChIP; luciferase reporter assay; USF2 and TXNRD1 knockdown/overexpression; in vitro and in vivo functional assays; Akt/mTOR pathway readouts\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter for direct promoter binding, in vivo experiments, single lab\",\n      \"pmids\": [\"36319631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USF2 transcriptionally activates TREM1 by binding its promoter (confirmed by luciferase reporter and ChIP assays), and USF2 knockdown reduces inflammatory cytokines (IL-6, IL-1β, TNF-α) in LPS-induced endometrial epithelial cells via the TREM1–TLR2/4–NF-κB axis.\",\n      \"method\": \"Luciferase reporter assay; ChIP; Co-IP (TREM1–TLR2/4); siRNA knockdown; ELISA\",\n      \"journal\": \"Bioengineered\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter confirm direct transcriptional activation; Co-IP for downstream binding partner; single lab\",\n      \"pmids\": [\"35100093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USF2 is a transcriptional activator of YTHDF1; USF2 knockdown in ischemia/reperfusion-injured neurons reduces YTHDF1, which otherwise suppresses autophagy via m6A-mediated stabilization of Cdc25A (an autophagy inhibitor), thereby worsening neuronal injury. Usf2 interference improved autophagy and alleviated I/R injury in MCAO mice.\",\n      \"method\": \"Luciferase reporter (USF2 binding to YTHDF1 promoter); lentiviral Usf2 shRNA in HT22 neurons and MCAO mice; YTHDF1 overexpression rescue; m6A/Cdc25A stability assays; autophagy and apoptosis readouts\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay for direct transcriptional regulation, in vitro and in vivo genetic rescue, single lab\",\n      \"pmids\": [\"37914905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USF2 negatively regulates STX6 transcription in hepatocellular carcinoma; STX6 facilitates autophagosome–lysosome fusion and accelerates LC3B degradation by promoting autophagic flux, promoting HCC progression downstream of USF2.\",\n      \"method\": \"Gain- and loss-of-function experiments; mechanistic reporter assays; co-localization of autophagosomes and lysosomes; in vitro and in vivo proliferation/metastasis assays\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional knockdown/overexpression with cellular phenotype, limited direct mechanistic evidence for USF2–STX6 transcriptional relationship, single lab\",\n      \"pmids\": [\"37564208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"USF2 represses lysosomal and autophagy genes under nutrient-rich conditions by binding CLEAR motifs together with HDAC1, reducing histone H3K27 acetylation and restricting chromatin accessibility. Under starvation, USF2 competes with TFEB for binding to target gene promoters. GSK3β phosphorylates USF2 at serine 155, reducing its DNA-binding activity and thereby de-repressing lysosomal gene expression. This mechanism was validated as a potential therapeutic target for α1-antitrypsin deficiency.\",\n      \"method\": \"ChIP for USF2 and HDAC1 co-occupancy at CLEAR motifs; histone acetylation (H3K27ac) assays; ATAC-seq (chromatin accessibility); competitive TFEB/USF2 binding assays; GSK3β phosphorylation assay; S155 mutagenesis; starvation-dependent gene regulation assays; disease model validation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (ChIP, ATAC-seq, phosphorylation/mutagenesis, competitive binding) in a single rigorous study with disease model validation\",\n      \"pmids\": [\"39333072\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"USF2 is a bHLH-leucine zipper transcription factor that binds E-box (CANNTG) and CLEAR motifs in target gene promoters, recruiting co-activators (p300) or co-repressors (HDAC1) to activate or repress transcription depending on cellular context; its activity is regulated by CDK5-mediated phosphorylation at S155/S222 (stabilizing the protein) and GSK3β-mediated phosphorylation at S155 (reducing DNA binding to de-repress lysosomal/autophagy genes under starvation), nuclear translocation is induced by mast cell activation signals and involves both its basic region and the conserved USF-specific region (USR), and it interacts with partners including HIF2α (to specify HIF2 target gene activation), Fra-1 (modulating HO-1 regulation), LysRS/Ap4A (regulating transcriptional activity), and HINT1 (inhibiting USF2 activity), with established roles in suppressing tumorigenesis, regulating lysosomal/autophagy homeostasis, controlling inflammatory cytokine production in Th17 cells, and governing expression of targets including IGF2R, TXNRD1, THBS1, S100A8, Smurf1/2, TREM1, STX6, and HOXB4.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"USF2 is a basic-helix-loop-helix leucine-zipper transcription factor that binds E-box (CANNTG) and CLEAR motifs in target promoters to either activate or repress transcription in a context- and partner-dependent manner [#11, #12, #34]. Its activity is governed by two transactivation domains (the USF-specific region/USR and an exon 5-encoded region) and two nuclear localization signals residing in the basic region and the USR [#0], and nuclear translocation is inducibly triggered in mast cells by IL-3 or IgE-antigen activation signals to support cell survival [#3]. Transcriptional output is set by recruited cofactors and binding partners: USF2 engages the coactivator p300 to drive activation [#4], partners with HDAC1 at CLEAR motifs to repress lysosomal/autophagy genes and lower H3K27 acetylation under nutrient-rich conditions, then is overridden under starvation when GSK3\\u03b2 phosphorylates Ser155 to reduce DNA binding and de-repress these genes in competition with TFEB [#34], and physically associates with HIF2\\u03b1 to confer HIF2-specific (versus HIF1) target-gene activation and Pol II recruitment under hypoxia [#22]. USF2 is itself stabilized by CDK5 phosphorylation at Ser155/Ser222 [#25] and is negatively regulated by HINT1 binding [#21] and modulated by a LysRS/Ap4A axis [#14]. Functionally, USF2 behaves as a tumor suppressor: it restrains c-Myc-dependent and prostate carcinogenesis, with USF2-null mice developing prostate hyperplasia [#16, #17], and it represses oncogenic targets such as TXNRD1 in hepatocellular carcinoma [#30]. It directly governs an extensive target repertoire including IGF2R, HO-1, Smurf1/2, THBS1, S100A8, TREM1, and HOXB4, linking it to autophagy/lysosomal homeostasis, TGF-\\u03b2 signaling, inflammation, and hematopoietic self-renewal [#11, #12, #23, #28, #29, #31, #8]. USF2 also acts as an upstream regulator of proinflammatory cytokine production in pathogenic Th17 cells [#27].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing the domain architecture answered how USF2 partitions its activation and nuclear-targeting functions, defining the USR and exon 5 region as transactivation domains and identifying two distinct NLSs.\",\n      \"evidence\": \"Immunofluorescence and GAL4/USF2 fusion reporter assays with deletion mutants in transfected cells\",\n      \"pmids\": [\"8657110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address endogenous target genes\", \"Context-restricted USR activation mechanism not fully resolved\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Early studies tested whether USF2 mediates glucose-responsive metabolic gene transcription and whether it heterodimerizes beyond its own family, implicating it in L-PK activation and in inhibiting c-Maf DNA binding.\",\n      \"evidence\": \"Antibody microinjection with L4-box mutant reporters in living beta-cells; yeast two-hybrid and gel-shift with c-Maf\",\n      \"pmids\": [\"9252379\", \"9070273\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"L-PK role later contradicted in INS-1 cells\", \"c-Maf interaction shown only in vitro/yeast\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Linking nuclear translocation to a cellular outcome showed that USF2 nuclear entry, driven through its USR-derived NLS, is required for IL-3-mediated mast cell survival.\",\n      \"evidence\": \"Subcellular fractionation and NLS-peptide inhibition with cell viability readout in mast cells\",\n      \"pmids\": [\"9743349\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream survival genes not identified\", \"Single lab/system\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identifying p300 as the coactivator answered how USF2 transactivates through initiator elements, defining a coactivator-dependent activation mechanism.\",\n      \"evidence\": \"Cotransfection reporter assays with E1A mutants and p300 rescue on the ATPA promoter\",\n      \"pmids\": [\"10434034\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct USF2-p300 binding not mapped\", \"Promoter-specific generalization untested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Genome-promoter binding surveys established USF1/USF2 as direct regulators across diverse promoters (FMR1, APC, Fc\\u03b5RI, HOXB4) and showed methylation can block their binding.\",\n      \"evidence\": \"EMSA with tissue extracts, methylation interference, yeast one-hybrid, and reporter assays across multiple promoters\",\n      \"pmids\": [\"11058604\", \"11241666\", \"11180124\", \"11085749\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"USF1 vs USF2 specificity not resolved at most promoters\", \"Largely correlative for endogenous regulation\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"A rigorous inducible system overturned the earlier L-PK model, showing ChREBP rather than USF mediates glucose-responsive L-PK expression and clarifying the limits of USF2's metabolic role.\",\n      \"evidence\": \"Tet-on overexpression/dominant-negative, Northern blot, EMSA, nuclear run-on in INS-1 cells\",\n      \"pmids\": [\"12087089\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not exclude USF2 metabolic roles in other tissues\", \"Mechanism of dispensability at the bound promoter unexplained\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Comparing USF1 and USF2 at IGF2R revealed paralog-specific activation, showing USF2 (not USF1) transactivates despite both occupying the promoter, and that this is lost in breast cancer cells.\",\n      \"evidence\": \"EMSA, ChIP, overexpression/dominant-negative, and Northern blot in mammary epithelial vs cancer lines\",\n      \"pmids\": [\"12857727\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of USF2-specific activation unresolved\", \"Cause of USF-independence in cancer cells unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Studies of HO-1 and a repressive splice isoform established that USF2 output is bidirectional and isoform-dependent, with USF2c acting as a homodimeric repressor.\",\n      \"evidence\": \"ChIP, in vivo footprinting, EMSA on HO-1; RT-PCR cloning, in vitro translation, and reporter assays for USF2c\",\n      \"pmids\": [\"15242350\", \"15276216\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch between activation and repression not mechanistically defined\", \"USF2c tissue distribution and physiological role limited\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Regulatory inputs and additional repressive targets were defined: a LysRS/Hint/Ap4A axis tunes USF2 activity, USF2 represses MCT1, and active USF2 suppresses c-Myc-driven transformation.\",\n      \"evidence\": \"Co-IP of LysRS with USF2 plus Ap4A functional assays; MCT1 EMSA/reporter; soft agar and nude mouse assays for c-Myc transformation\",\n      \"pmids\": [\"16199869\", \"15691871\", \"15541720\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"LysRS/Ap4A mechanism inferred by analogy to MITF\", \"Anti-transformation mechanism only partially mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Genetic and xenograft evidence established USF2 as a bona fide tumor suppressor in prostate, with knockout mice developing prostate hyperplasia.\",\n      \"evidence\": \"Soft agar, invasion, xenograft assays in PC-3, USF2-knockout mouse, and human tissue IHC\",\n      \"pmids\": [\"16186802\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tumor-suppressive target genes in prostate not fully defined\", \"Mechanism of hyperplasia in knockout unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The cell-type-dependent reversal of HO-1 regulation was explained by USF2's partnership with the AP-1 factor Fra-1 and its requirement for both E-box and AP-1 sites plus the USR/exon 4 domains.\",\n      \"evidence\": \"Promoter mutagenesis, Co-IP with Fra-1, and domain-deletion analysis in hepatocytes vs tumor lines\",\n      \"pmids\": [\"18331200\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants selecting activation vs repression per cell type unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genome-wide mapping placed USF1/USF2 binding predominantly at active transcription start sites and bidirectional promoters, framing them as broad promoter-proximal regulators.\",\n      \"evidence\": \"ChIP-chip at 35-bp resolution in HepG2 correlated with expression data\",\n      \"pmids\": [\"18230803\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional follow-up for individual USF2 targets\", \"Single cell line\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Negative regulation by HINT1 and allele-specific recruitment at FOXE1 refined understanding of USF2 control and its role in disease-associated variants.\",\n      \"evidence\": \"Co-IP and reporter assays for HINT1; EMSA supershift and allele-specific reporter at FOXE1 rs1867277\",\n      \"pmids\": [\"19089909\", \"19730683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"HINT1 inhibition mechanism not structurally defined\", \"FOXE1 regulation shown largely in vitro\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying the HIF2\\u03b1 interaction answered how HIF2 versus HIF1 target-gene specificity is achieved, showing USF2 is required for HIF2 target activation and Pol II recruitment under hypoxia.\",\n      \"evidence\": \"siRNA, ChIP, reporter assays, and Co-IP with HIF2\\u03b1 domain-mapping mutants\",\n      \"pmids\": [\"23991099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of HIF2\\u03b1-USF2 contact not resolved\", \"In vivo relevance across tissues untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"USF2 was linked to TGF-\\u03b2 signaling and hematopoietic self-renewal by repressing Smurf1/2 and co-activating MSI2 with PLAG1.\",\n      \"evidence\": \"ChIP/ChIP-seq, reporter assays, and overexpression with CD34+ expansion phenotype\",\n      \"pmids\": [\"30244169\", \"29641991\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect contribution to TGF-\\u03b2 output not fully separated\", \"Single lab per study\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Post-translational and target-level mechanisms advanced: CDK5 phosphorylation at S155/S222 stabilizes USF2, and USF2 directly regulates ATF4 to drive osteogenic differentiation.\",\n      \"evidence\": \"In vitro kinase assay with S155/S222 mutagenesis; reporter assays and ATF4 silencing rescue in periodontal ligament cells\",\n      \"pmids\": [\"31013770\", \"31448831\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How S155/S222 phosphorylation stabilizes the protein unresolved\", \"Single-lab phenotypes\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"USF2 was established as an upstream regulator of pathogenic Th17 cytokine programs, extending its role to inflammation.\",\n      \"evidence\": \"shRNA knockdown in primary human CCR6+ Th17 cells with cytokine readouts and GSEA\",\n      \"pmids\": [\"33203678\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct USF2 target promoters in Th17 cells not mapped\", \"Mechanism upstream of cytokine genes inferred\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Disease-context studies defined USF2-driven transcriptional axes (THBS1, S100A8) that promote pyroptosis/AKI and colorectal EMT/metastasis via TGF-\\u03b2 signaling.\",\n      \"evidence\": \"ChIP/reporter for direct binding plus in vitro and in vivo functional models\",\n      \"pmids\": [\"34756923\", \"33389821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Context that switches USF2 between tumor-suppressive and pro-metastatic roles unresolved\", \"Single lab per target\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"USF2's tumor-suppressive output was further mechanized through direct repression of TXNRD1 (gating Akt/mTOR via PTEN) and activation of TREM1 in inflammation.\",\n      \"evidence\": \"ChIP and reporter assays for direct promoter binding with knockdown/overexpression and pathway readouts\",\n      \"pmids\": [\"36319631\", \"35100093\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants of repressor vs activator role at different promoters unresolved\", \"Single lab per study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"USF2 was tied to autophagy regulation through transcriptional control of YTHDF1 and STX6, linking it to neuronal I/R injury and HCC autophagic flux.\",\n      \"evidence\": \"Reporter assays and genetic rescue in neurons/HCC models with autophagy readouts\",\n      \"pmids\": [\"37914905\", \"37564208\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"STX6 transcriptional link supported by limited direct evidence (Low confidence)\", \"Direct vs indirect autophagy control not fully separated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A unifying mechanism for autophagy/lysosomal control was established: USF2 represses CLEAR-motif genes with HDAC1 under nutrient-rich conditions, and GSK3\\u03b2 phosphorylation at S155 de-represses them under starvation in competition with TFEB.\",\n      \"evidence\": \"ChIP for USF2/HDAC1 co-occupancy, H3K27ac and ATAC-seq, competitive TFEB binding, GSK3\\u03b2 phosphorylation, S155 mutagenesis, and disease-model validation\",\n      \"pmids\": [\"39333072\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How S155 phosphorylation by GSK3\\u03b2 versus CDK5 produces opposite functional outcomes unresolved\", \"Generality of TFEB competition across cell types untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"What molecular features dictate USF2's switch between activator and repressor (cofactor identity, partner, post-translational state) across cell types remains the central unresolved question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of context-dependent cofactor selection\", \"Conflicting S155 phosphorylation outcomes (CDK5 stabilizing vs GSK3\\u03b2 inhibiting) not reconciled\", \"USF1 vs USF2 paralog division of labor incompletely defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 6, 11, 12, 16, 22, 30, 34]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [11, 12, 22, 23, 30, 34]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 14, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [12, 22, 34]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 11, 12, 22, 34]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [32, 33, 34]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [34]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [16, 17, 28, 29, 30]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"USF1\", \"HIF2A\", \"FOSL1\", \"HINT1\", \"KARS1\", \"p300\", \"HDAC1\", \"c-Maf\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}