{"gene":"POU2F1","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":1987,"finding":"OTF-1 (POU2F1) was purified from HeLa nuclear extracts and shown to directly stimulate transcription of the human histone H2b gene in a reconstituted in vitro system, dependent on an intact octamer element and the TATA motif but not other H2b promoter elements. Activity was absent in G2-synchronized cells, establishing cell-cycle-dependent regulation.","method":"DNA affinity chromatography purification, SDS-PAGE renaturation, reconstituted in vitro transcription assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro transcription with purified factor, octamer-element dependency established by mutagenesis, cell-cycle control confirmed","pmids":["3677172"],"is_preprint":false},{"year":1988,"finding":"OTF-1 (POU2F1) is physically and functionally identical to the adenovirus DNA replication factor NF-III: identical SDS-PAGE mobility, same binding site and affinity at the adenovirus origin, ability to substitute for NF-III in activating adenovirus DNA replication in vitro, and NF-III can substitute for OTF-1 in H2b transcription, demonstrating a dual role in transcription and DNA replication.","method":"SDS-PAGE, DNA-binding assays, in vitro adenovirus DNA replication assay, in vitro transcription complementation assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal in vitro assays (replication, transcription, binding) with reciprocal substitution experiments in a single rigorous study","pmids":["3413485"],"is_preprint":false},{"year":1988,"finding":"OTF-1 (POU2F1) binds the TAATGARAT sequence in HSV immediate-early gene promoters. The herpes simplex virus trans-activator Vmw65 (VP16) induces formation of an additional, more-retarded complex containing OTF-1, and at least one additional cellular factor (distinct from OTF-1) is required for this complex formation.","method":"Affinity purification, electrophoretic mobility shift assay (EMSA), complementation with OTF-1-depleted nuclear extracts","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal EMSA with purified protein, depletion-complementation experiment, replicated across OTF-1 and OTF-2","pmids":["2842768"],"is_preprint":false},{"year":1990,"finding":"OTF-1 (POU2F1) and Sp1 physically interact and show cooperative binding to DNA: Sp1 binding sites stimulate transcription more strongly when paired with low-affinity OTF-1 sites than high-affinity ones, and this functional cooperation is mirrored by cooperative protein–DNA complex formation in vitro.","method":"Synthetic enhancer constructs, in vitro transcription assays, EMSA cooperative binding","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro transcription plus cooperative EMSA; functional and physical interaction demonstrated in same study","pmids":["2191301"],"is_preprint":false},{"year":1990,"finding":"Purified OTF-1 (POU2F1) and OTF-2 show indistinguishable DNA-binding affinity and contacts on H2b and immunoglobulin promoters and equivalent intrinsic capacity to activate transcription from either promoter in OTF-depleted extracts. Full immunoglobulin gene transcription additionally requires a B-cell-specific component that interacts with OTFs.","method":"High-resolution DNase I footprinting, EMSA competition, reconstituted in vitro transcription with OTF-depleted HeLa and B-cell extracts","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro transcription with purified factors and depleted extracts, multiple DNA-binding assays","pmids":["2123291"],"is_preprint":false},{"year":1991,"finding":"The MMTV promoter contains two degenerate octamer motifs upstream of the TATA box that bind OTF-1 (POU2F1). In vitro, mutation of these octamer motifs abolishes the stimulatory effect of purified progesterone receptor on transcription without affecting basal transcription. Progesterone and glucocorticoid receptors bound to the HRE facilitate binding of OTF-1 to these sites, revealing OTF-1 as a mediator of hormonal induction through cooperative DNA binding with hormone receptors.","method":"DNA binding assays, in vitro transcription with purified progesterone receptor, transfection with promoter mutants","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstitution with purified receptor, promoter mutagenesis, functional transcription assays, and cooperative binding demonstrated","pmids":["1846780"],"is_preprint":false},{"year":1991,"finding":"OTF-1 (POU2F1) binds two distinct sites in the Aγ-globin gene promoter: site II (octamer-related) and site I (purine-rich, -291 to -267) with equal affinity despite site I having no obvious octamer similarity, as shown by immunological identity and methylation interference footprinting.","method":"Immunological identity assay, EMSA, methylation interference footprinting","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunological identity plus footprinting in a single study; no functional transcription rescue","pmids":["2007132"],"is_preprint":false},{"year":1992,"finding":"The glucocorticoid receptor (GR) negatively regulates OTF-1 (POU2F1) function in a hormone-dependent manner by directly associating with OTF-1 in solution, independent of DNA binding, resulting in repression of OTF-1 DNA-binding activity. The homeodomain subdomain of OTF-1 that interacts with VP16 is also critical for GR interaction.","method":"In vivo reporter assays, nuclear extract DNA-binding assay, in vitro incubation with purified GR, chemical cross-linking and immunoprecipitation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (in vivo repression, in vitro binding, cross-linking/IP, domain mapping) in a single study","pmids":["1406672"],"is_preprint":false},{"year":1998,"finding":"OTF-1 (POU2F1) can bind its cognate site on the MMTV promoter assembled into an H3/H4 tetramer particle but cannot access the same site on a full histone octamer particle. SWI/SNF complex remodels the octamer particle to a tetramer-like state in an ATP-dependent manner, enabling OTF-1 binding.","method":"Chromatin reconstitution with recombinant histones, site-directed hydroxyl radical mapping, factor-binding assays on nucleosomal templates, SWI/SNF remodeling assay","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted chromatin particles, hydroxyl radical mapping, factor binding on defined particles, ATP-dependent remodeling assay","pmids":["9614938"],"is_preprint":false},{"year":2006,"finding":"Oct-1 (Pou2f1) acts as a co-factor for Sox2 during mouse lens and nasal placode induction. Genetic combination of Sox2 and Pou2f1 hypomorphic alleles causes impaired lens placode induction and complete failure of nasal placode induction. Oct-1 and Sox2 cooperatively bind composite Sox/Octamer sites in the Pax6 lens ectoderm enhancer to drive transactivation, and these same sites are required for enhancer activity in transgenic mice.","method":"Genetic epistasis (compound heterozygous mouse mutants), in vitro transactivation assay, transgenic enhancer analysis in mice","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in mouse, in vitro cooperative binding/transactivation, and in vivo transgenic enhancer validation","pmids":["17140559"],"is_preprint":false},{"year":2013,"finding":"Oct1/Pou2f1 is modified by O-linked β-N-acetylglucosamine (O-GlcNAc) at positions T255 and S728. Under anchorage-independent overgrowth conditions, O-GlcNAcylation correlates with 3-fold increased Oct1 binding to the Gadd45a promoter, transcriptional repression of Gadd45a, reduced association with lamin B1, and reduced nuclear periphery puncta. The O-GlcNAc sites are required for both Gadd45a repression under overgrowth and Gadd45a activation upon acute starvation, and for anchorage-independent survival. Specific ubiquitination sites on Oct1 were also identified.","method":"O-GlcNAc site mapping, ChIP assay, site-directed mutagenesis of modification sites, FRAP/localization imaging, functional reporter assays","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — PTM site mapping with mutagenesis, ChIP, localization and functional rescue in single study with orthogonal methods","pmids":["23580612"],"is_preprint":false},{"year":2015,"finding":"In gastric cancer cells, the ACK1 kinase phosphorylates AKT at Thr308 and Ser473, activating the AKT pathway which up-regulates POU2F1, which in turn directly binds the ECD promoter to drive ECD transcription. ECD silencing blocks ACK1-induced EMT, migration, and invasion, placing POU2F1 as a transcriptional effector downstream of ACK1/AKT in this signalling axis.","method":"SILAC proteomics, promoter binding assay, knockdown/overexpression functional assays, in vivo metastasis model, phosphorylation analysis","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — promoter binding shown, epistasis by knockdown rescue, but single lab; AKT→POU2F1 link is indirect","pmids":["25678401"],"is_preprint":false},{"year":2017,"finding":"POU2F1 directly binds the CTHRC1 promoter and activates its transcription; HPV E6/E7 proteins regulate CTHRC1 expression via an E6/E7-p53-POU2F1 axis in cervical cancer, and CTHRC1 promotes invasion by activating the Wnt/PCP signaling pathway.","method":"Promoter binding/reporter assays, gain/loss-of-function, in vitro invasion assay, in vivo metastasis model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — promoter binding shown by reporter assay, pathway epistasis by knockdown, single lab","pmids":["28303973"],"is_preprint":false},{"year":2017,"finding":"POU2F1 is regulated upstream by the AKT pathway in hepatocellular carcinoma cells, and POU2F1 overexpression reverses the inhibition of malignant phenotypes (proliferation, EMT, migration, invasion) caused by AKT knockdown, positioning POU2F1 as a key downstream effector of AKT. POU2F1 induces transcription of EMT genes Twist1, Snai1, Snai2, and ZEB1.","method":"Knockdown/overexpression epistasis, Western blotting, in vitro functional assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — epistasis by rescue overexpression, target gene expression changes; no direct promoter binding for EMT genes shown; single lab","pmids":["28489585"],"is_preprint":false},{"year":2017,"finding":"POU2F1 directly binds the promoters of fibrosis repressors IL1R2, CD69, and TGIF2 (shown by ChIP) in cardiac fibroblasts and represses their expression. Pathological substrate stiffness upregulates POU2F1, which promotes cardiac fibroblast differentiation into myofibroblasts; POU2F1 knockdown upregulates these repressors and attenuates differentiation.","method":"ChIP assay, knockdown/overexpression on polyacrylamide hydrogels and in mouse MI tissue, immunofluorescence, Western blotting","journal":"Science China. Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-confirmed direct promoter binding, functional phenotype in physiological stiffness model; single lab","pmids":["32617828"],"is_preprint":false},{"year":2017,"finding":"POU2F1 is methylation-sensitive in its DNA binding at the HSP70 promoter: hypermethylation of a distal HSP70 promoter region reduces POU2F1 binding and reduces recruitment of the NuRD chromatin-remodeling complex, resulting in higher histone H3 acetylation at the HSP70 promoter.","method":"In vitro methylation-transcription assay, in vivo MeDIP, chromatin immunoprecipitation (POU2F1 and NuRD complex), histone acetylation analysis","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for POU2F1 and NuRD at the promoter, methylation-dependent binding, multiple in vitro and in vivo methods; single lab","pmids":["28278364"],"is_preprint":false},{"year":2019,"finding":"Oct1/Pou2f1 deletion in mouse colon blocks recovery from dextran sodium sulfate-induced damage and impairs organoid passaging, but preserves homeostasis. In a carcinogen-induced colon cancer model, Oct1 loss severely restricts tumorigenicity, while in an Apc-LOH model, Oct1 loss progressively increases tumor burden. Oct1 ChIP-seq identifies direct target genes associated with mitotic stability, metabolism, and stress response.","method":"Conditional gene deletion in mouse colon, organoid assays, DSS treatment model, chemical carcinogenesis model, Apc-LOH model, ChIP-seq","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in two genetic cancer models with divergent phenotypes, organoid assays, ChIP-seq; single lab but multiple orthogonal approaches","pmids":["31059499"],"is_preprint":false},{"year":2020,"finding":"In developing mouse retina, Pou2f1 induces Pou2f2 expression; Pou2f2 then binds a POU motif in the Nrl (rod-inducing factor) promoter to repress its expression, thereby controlling the temporal window of cone photoreceptor production. Forced sustained Pou2f1/2 expression expands cone production; conditional inactivation of Pou2f2 increases Nrl and reduces cones. Pou2f1 is part of a cross-regulatory cascade with temporal factors Ikzf1 and Casz1.","method":"Retroviral misexpression, conditional knockout, promoter binding assay (POU motif in Nrl promoter), genetic epistasis","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function and conditional KO in mouse retina, direct promoter binding, epistasis with Ikzf1/Casz1; multiple orthogonal approaches","pmids":["32878923"],"is_preprint":false},{"year":2021,"finding":"POU2F1 directly binds the promoter of TTC3-AS1 (by ChIP and DNA-affinity precipitation) and activates its transcription in gastric cancer cells. TTC3-AS1 knockdown neutralizes the pro-tumor effects of POU2F1 overexpression in vitro and in mouse GC models, placing TTC3-AS1 downstream of POU2F1.","method":"ChIP assay, DNA-affinity precipitation, luciferase reporter assay, knockdown/overexpression, in vivo mouse model","journal":"Journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmed by ChIP and DNA pulldown, functional epistasis by rescue; single lab","pmids":["34257651"],"is_preprint":false},{"year":2021,"finding":"POU2F1 directly binds and suppresses the NPR3 promoter (primarily at the -900 to -800 bp region), as shown by dual-luciferase reporter and site-directed mutagenesis assays. POU2F1 over-expression enhances cell proliferation and activates the PI3K/AKT pathway, effects reversed by NPR3 overexpression.","method":"Dual-luciferase reporter assay, site-directed mutagenesis, knockdown/overexpression, in vivo xenograft","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter binding site identified by mutagenesis, functional epistasis; single lab","pmids":["34229087"],"is_preprint":false},{"year":2021,"finding":"POU2F1 autoregulates its own gene through two mechanisms: it acts via negative feedback on the ubiquitous (U) promoter through low-affinity binding sites, and via positive feedback on the tissue-specific (L) promoter through high-affinity canonical Oct sites. Knockdown activates the U promoter and downregulates the L promoter; overexpression has opposite effects. Binding confirmed by ChIP and EMSA.","method":"ChIP, EMSA, promoter reporter assay, knockdown/overexpression in Namalwa cells","journal":"Molekuliarnaia biologiia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and EMSA confirm binding, functional reporter assays; single lab","pmids":["34837701"],"is_preprint":false},{"year":2021,"finding":"POU2F1 activates transcription of CRK, which in turn promotes PD-L1 expression in lung cancer cells. POU2F1 overexpression increases PD-L1 surface expression; knockdown of POU2F1 reduces PD-L1 and enhances anti-PD-1 efficacy in a mouse tumor model.","method":"Luciferase reporter assay (CRK promoter), overexpression/knockdown, flow cytometry, immunofluorescence, in vivo mouse tumor model with anti-PD-1","journal":"American journal of translational research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — promoter reporter assay, functional in vivo evidence; direct binding to CRK promoter not confirmed by ChIP; single lab","pmids":["33594317"],"is_preprint":false},{"year":2022,"finding":"POU2F1 directly binds the ALDOA promoter (by ChIP and luciferase assay) to enhance ALDOA expression, thereby promoting aerobic glycolysis, the pentose phosphate pathway, and oxaliplatin resistance in colon cancer cells.","method":"ChIP assay, dual-luciferase reporter assay, knockdown/overexpression functional assays, metabolic flux measurements","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding confirmed by ChIP, reporter, and metabolic assays; single lab","pmids":["34997215"],"is_preprint":false},{"year":2022,"finding":"C/EBPβ is a transcriptional activator of POU2F1, as confirmed by dual-luciferase reporter assay. Exercise training activates AMPK, which suppresses C/EBPβ, thereby reducing POU2F1 expression and attenuating Ang II-induced cardiac fibrosis in vivo. POU2F1 overexpression in vivo nullifies the cardioprotective effect of exercise.","method":"Dual-luciferase reporter assay, in vivo adeno-associated virus overexpression, AMPK agonist/inhibitor pharmacology, RNA sequencing","journal":"Journal of sport and health science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase confirms C/EBPβ→POU2F1 promoter activation, in vivo overexpression epistasis; single lab","pmids":["36374849"],"is_preprint":false},{"year":2023,"finding":"In spinal dorsal horn neurons, POU2F1 binds to the DNMT3a promoter and activates its transcription; oxaliplatin treatment upregulates POU2F1, leading to increased DNMT3a expression, hypermethylation of the Lrfn4 promoter, and decreased LRFN4 expression, which mediates mechanical allodynia and cold hyperalgesia. Intrathecal POU2F1 siRNA prevents DNMT3a upregulation and LRFN4 downregulation.","method":"ChIP assay (POU2F1 on DNMT3a promoter), MeDIP, qPCR, siRNA knockdown in vivo, behavioral pain assays","journal":"Neurochemical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms POU2F1-DNMT3a promoter binding, in vivo siRNA epistasis; single lab","pmids":["37592110"],"is_preprint":false},{"year":2024,"finding":"TRIM21 E3 ubiquitin ligase directly interacts with POU2F1 and induces K48-linked ubiquitination at K272 of POU2F1, leading to its proteasomal degradation. DADS treatment promotes this K272 ubiquitination by upregulating TRIM21 via attenuation of PI3K/AKT signaling. Reduced POU2F1 impairs PPP flux and PRPP production, enhancing DNA damage and apoptosis in CRC cells.","method":"Co-immunoprecipitation, ubiquitination site mapping, K272 mutagenesis, TRIM21 knockdown/overexpression, PI3K signaling manipulation, in vivo tumor model","journal":"International journal of biological sciences","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — specific ubiquitination site identified by mutagenesis, writer (TRIM21) identified by Co-IP, PI3K/TRIM21/POU2F1 epistasis by rescue; single lab but multiple orthogonal methods","pmids":["38385081"],"is_preprint":false},{"year":2019,"finding":"POU2F1 protein directly binds the -713 to -703 bp region of the Slc7a11 promoter to inhibit its transcriptional activity, as shown by dual-luciferase reporter and site-directed mutagenesis assays in rabbit melanocytes.","method":"Dual-luciferase reporter assay, site-directed mutagenesis, rabbit melanocyte culture, knockdown/overexpression","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific promoter region identified by mutagenesis, functional assay; single lab, non-human species (rabbit)","pmids":["31137576"],"is_preprint":false},{"year":2014,"finding":"POU2F1 consensus binding sites within the 5' DNA of HOXD10 and HOXD11 are required for optimal promoter activity (by luciferase reporter), and POU2F1 knockdown significantly reduces HOXD10 and HOXD11 expression and inhibits HNSCC cell proliferation.","method":"Luciferase reporter assay with mutant POU2F1 binding sites, siRNA knockdown, proliferation and invasion assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter site-dependency shown by reporter mutagenesis, functional KD phenotype; single lab","pmids":["25301728"],"is_preprint":false},{"year":2020,"finding":"In gastric cancer, POU2F1 directly binds to POU2F1 binding sites within both the miR-4490 promoter (repressing miR-4490 transcription) and the USP22 promoter (activating USP22 transcription), as confirmed by ChIP and dual-luciferase reporter assays. POU2F1 promotes GC proliferation and EMT-induced metastasis through this axis.","method":"ChIP assay, dual-luciferase reporter assay, ISH, IHC, flow cytometry, in vitro/in vivo functional assays","journal":"Cellular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmed by ChIP at two target promoters, reporter assays; single lab","pmids":["32857323"],"is_preprint":false},{"year":2021,"finding":"POU2F1 binds the FAM201A promoter and transcriptionally activates it, forming a positive feedback loop with miR-146a-5p: FAM201A sponges miR-146a-5p to upregulate POU2F1, and POU2F1 in turn drives FAM201A transcription. Confirmed by ChIP and luciferase reporter assay in chondrocytes.","method":"ChIP assay, luciferase reporter assay, miRNA sponge assay, IL-1β chondrocyte injury model","journal":"Molecular medicine reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter confirm POU2F1 binding to FAM201A promoter; feedback loop established; single lab","pmids":["34796909"],"is_preprint":false},{"year":2022,"finding":"POU2F1 directly binds and activates the promoter of TTC3-AS1 in gastric cancer (confirmed by ChIP and DNA-affinity precipitation), and LINC01564 lncRNA binds the 3'UTR of POU2F1 mRNA to stabilize it (confirmed by RIP and RNA pulldown), forming a positive regulatory loop.","method":"RIP, RNA pulldown, ChIP assay, MTT, invasion/clonogenic assay, in vivo metastasis model","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct POU2F1-3'UTR interaction by RIP/pulldown, promoter binding by ChIP; single lab","pmids":["35562740"],"is_preprint":false},{"year":2021,"finding":"A CHD-associated SNP rs492554 and linked SNP rs12406992 map within a POU2F1 binding motif in the SESN2 regulatory region; the protective T allele shows preferential binding affinity to POU2F1 by EMSA and luciferase assay. POU2F1 knockdown suppresses luciferase expression driven by the T-C haplotype, demonstrating POU2F1 acts as an allele-specific transcriptional activator of SESN2.","method":"EMSA, luciferase reporter assay, POU2F1 knockdown, eQTL analysis","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and reporter with allele-specific binding and KD rescue; single lab","pmids":["34249922"],"is_preprint":false},{"year":2024,"finding":"POU2F1 directly binds the miR-29b1/a cluster promoter (shown by ChIP and luciferase) to repress miR-29b-3p and miR-29a-3p transcription. This elevates PIK3R1 and PIK3R3 (direct targets of these miRNAs), activating PI3K/Akt/mTOR signaling to promote gastric cancer cell invasion and metastasis. Co-immunoprecipitation demonstrated PIK3R1-PIK3R3 interaction.","method":"ChIP assay, luciferase reporter assay, co-immunoprecipitation, Transwell invasion assay, in vivo metastasis model, miRNA/target validation","journal":"Chinese medical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter confirm direct binding at miR-29b1/a promoter; pathway epistasis by rescue; Co-IP for PIK3R interaction; single lab","pmids":["39183556"],"is_preprint":false},{"year":2019,"finding":"The nucleotide sequence and position of substitutions at PORE (palindromic octamer-related element) and MORE (more PORE) sites determines whether Oct-1/POU2F1 binds as a monomer, homodimer, or multimer. Specific substitutions suppress dimer formation while others stimulate it, demonstrating that DNA sequence conformation of the binding site controls the character of POU2F1-DNA interaction.","method":"EMSA with nucleotide substitution series in PORE/MORE sites","journal":"Molekuliarnaia biologiia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutagenesis of binding sites with EMSA; single lab, but comprehensive substitution analysis","pmids":["31184608"],"is_preprint":false},{"year":1994,"finding":"OTF-1 (POU2F1) and NFI binding sites on the stably integrated MMTV LTR are permanently occupied in vivo in NIH3T3 and GR cells that exhibit hormone-independent MMTV expression, as shown by in vivo DMS footprinting, with guanine contacts identical to those identified by in vitro methylation interference.","method":"In vivo dimethyl sulfate (DMS) footprinting, in vitro methylation interference assay","journal":"Cellular & molecular biology research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vivo footprinting validated by in vitro methylation interference; single study, limited functional follow-up","pmids":["7787882"],"is_preprint":false},{"year":2024,"finding":"Bovine Oct1/POU2F1 acts as a pro-viral factor for BoHV-1 replication: CRISPR/Cas9 Oct1 knockout in MDBK cells significantly reduces viral gene expression (all three temporal gene classes) and viral replication, a phenotype rescued by re-expression of wild-type Oct1.","method":"CRISPR/Cas9 knockout, viral infection at high and low MOI, viral gene expression analysis, rescue overexpression","journal":"Viruses","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean CRISPR KO with rescue, viral replication and gene expression quantified; single lab, non-human species (bovine)","pmids":["39459888"],"is_preprint":false},{"year":2025,"finding":"POU2F1 directly activates LDHA transcription in pituitary adenoma cells (confirmed by dual-luciferase reporter and ChIP assays), promoting proliferation, invasion, migration, sphere formation, and aerobic glycolysis. LDHA overexpression ameliorates PI3K/AKT pathway inactivation induced by POU2F1 silencing, placing POU2F1 upstream of LDHA and PI3K/AKT.","method":"Dual-luciferase reporter assay, ChIP assay, knockdown/overexpression, in vivo xenograft","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter confirm direct binding, PI3K/AKT epistasis by rescue; single lab","pmids":["40819704"],"is_preprint":false},{"year":2026,"finding":"POU2F1 promotes chemoresistance in colorectal cancer by stimulating MCT4 expression, thereby reducing cytosolic lactate and decreasing lactylation of PPP1R11. Reduced PPP1R11 lactylation destabilizes PPP1R11 E3 ligase activity, preventing MDR2 ubiquitination and degradation, thus stabilizing MDR2 and conferring chemoresistance.","method":"Knockdown/overexpression, MCT4 and PPP1R11 lactylation assays, MDR2 ubiquitination assay, in vivo tumor model","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic chain from POU2F1 to MCT4 to lactylation to MDR2 stability; single lab, complex mechanism requiring orthogonal validation","pmids":["41793212"],"is_preprint":false},{"year":2026,"finding":"POU2F1 directly activates transcription of DHCR24 and ELOVL2 (confirmed by ChIP and luciferase assays), driving cholesterol biosynthesis and lipid metabolic remodeling in endometrial cancer. POU2F1 knockdown reduces DHCR24 and ELOVL2 levels, proliferation, migration, and invasion, effects reversed by DHCR24/ELOVL2 restoration.","method":"ChIP assay, luciferase reporter assay, knockdown/overexpression, xenograft model","journal":"Cancer & metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding by ChIP and reporter, functional epistasis by rescue; single lab","pmids":["41947242"],"is_preprint":false},{"year":2026,"finding":"USP18 deubiquitinase stabilizes POU2F1 by removing its ubiquitin chains; the lncRNA ABHD11-AS1 suppresses USP18 translation by binding EIF4E and disrupting its phase separation, leading to increased POU2F1 ubiquitination and proteasomal degradation in CRC cells.","method":"Co-immunoprecipitation, ubiquitination assay, EIF4E phase separation assay, siRNA knockdown, Western blotting","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — USP18-POU2F1 interaction and ubiquitination confirmed; EIF4E phase separation mechanistic link; single lab","pmids":["42157946"],"is_preprint":false}],"current_model":"POU2F1 (Oct-1/OTF-1) is a ubiquitous POU-homeodomain transcription factor that binds octamer (ATGCAAAT) and related sequence motifs—as a monomer, homodimer (at PORE/MORE sites), or in cooperative complexes with partners such as Sox2, Sp1, hormone receptors, and viral VP16—to activate or repress target gene transcription (histone H2b, immunoglobulin genes, HOXD10/11, ALDOA, LDHA, DHCR24/ELOVL2, ECD, NPR3, miR-29b1/a cluster, and others); it also functions as the adenovirus DNA replication factor NF-III; its activity is regulated by O-GlcNAcylation at T255/S728 (integrating metabolic signals), K48-linked ubiquitination at K272 by TRIM21 (promoted by PI3K/AKT attenuation), deubiquitination by USP18, direct protein–protein repression by the glucocorticoid receptor (via the homeodomain), and promoter DNA methylation that blocks its binding; and it acts as a temporal transcription factor in retinal progenitors to control the cone-versus-rod photoreceptor fate window by inducing Pou2f2, which represses Nrl."},"narrative":{"mechanistic_narrative":"POU2F1 (Oct-1/OTF-1) is a ubiquitous POU-homeodomain transcription factor that binds octamer and octamer-related DNA elements to activate or repress transcription, with binding-site sequence determining whether it engages DNA as a monomer or homodimer at PORE/MORE sites [PMID:3677172, PMID:31184608]. It was first purified as a sequence-specific activator of the histone H2b gene in a reconstituted system, an activity that is octamer-element dependent and lost in G2-synchronized cells, establishing cell-cycle-coupled transcriptional control [PMID:3677172]. The same protein is physically and functionally identical to the adenovirus DNA replication factor NF-III, giving it a dual role in transcription and viral DNA replication [PMID:3413485], and it serves as the cellular octamer-binding component recruited by herpesvirus VP16 at TAATGARAT elements [PMID:2842768]; in bovine cells it acts as a pro-viral factor required for BoHV-1 gene expression and replication [PMID:39459888]. POU2F1 acts combinatorially: it cooperates with Sp1 [PMID:2191301], functions as a co-factor with Sox2 at composite Sox/octamer sites to drive Pax6 enhancer activity during lens and nasal placode induction [PMID:17140559], and mediates hormone-receptor-dependent induction of the MMTV promoter through cooperative DNA binding with progesterone and glucocorticoid receptors [PMID:1846780], while the glucocorticoid receptor can also directly bind its homeodomain to repress its DNA-binding activity [PMID:1406672]. Its access to target sites is gated by chromatin state, requiring SWI/SNF-dependent nucleosome remodeling [PMID:9614938] and being blocked by promoter DNA methylation [PMID:28278364]. POU2F1 functions as a temporal transcription factor in retinal progenitors, inducing Pou2f2 which represses Nrl to set the cone-versus-rod photoreceptor fate window [PMID:32878923], and in mouse colon it directs target genes governing mitotic stability, metabolism, and stress responses and has context-dependent roles in tumorigenesis [PMID:31059499]. Across cancers POU2F1 drives metabolic and pro-tumor programs by directly binding promoters of glycolytic and lipogenic genes including ALDOA, LDHA, and DHCR24/ELOVL2 [PMID:34997215, PMID:40819704, PMID:41947242]. Its protein level is controlled by O-GlcNAcylation at T255/S728, which integrates metabolic state into its DNA binding and nuclear-periphery localization [PMID:23580612], and by ubiquitin turnover—TRIM21 catalyzes K48-linked ubiquitination at K272 driving proteasomal degradation [PMID:38385081], opposed by USP18-mediated deubiquitination [PMID:42157946].","teleology":[{"year":1987,"claim":"Established POU2F1 as a bona fide sequence-specific transcriptional activator by demonstrating it directly stimulates a target promoter through the octamer element, and that this activity is cell-cycle-regulated.","evidence":"DNA affinity purification from HeLa extracts and reconstituted in vitro transcription of the H2b gene with octamer mutagenesis","pmids":["3677172"],"confidence":"High","gaps":["Mechanism of G2-specific loss of activity not defined","No in vivo target validation"]},{"year":1988,"claim":"Revealed an unexpected dual function by showing the octamer-binding transcription factor is identical to the adenovirus DNA replication factor NF-III, linking transcription and viral DNA replication machinery.","evidence":"SDS-PAGE comigration, shared binding site/affinity, and reciprocal substitution in in vitro replication and transcription assays","pmids":["3413485"],"confidence":"High","gaps":["Structural basis of dual activity not resolved","Relevance to cellular DNA replication not addressed"]},{"year":1988,"claim":"Defined POU2F1 as the host octamer-binding factor commandeered by herpesvirus VP16, and showed an additional cellular factor is required for VP16 complex assembly.","evidence":"Affinity purification, EMSA, and depletion-complementation at TAATGARAT promoters","pmids":["2842768"],"confidence":"High","gaps":["Identity of the additional cellular factor not established in this work"]},{"year":1990,"claim":"Showed POU2F1 acts combinatorially with other factors, establishing cooperative protein-protein and protein-DNA interactions as a core mode of action.","evidence":"Synthetic enhancers, cooperative EMSA, and in vitro transcription with Sp1; OTF-depletion/reconstitution comparing OTF-1 and OTF-2","pmids":["2191301","2123291"],"confidence":"High","gaps":["Identity of B-cell-specific co-factor for immunoglobulin transcription not defined","Functional non-redundancy of OTF-1 vs OTF-2 in cells unresolved"]},{"year":1991,"claim":"Demonstrated POU2F1 mediates hormonal induction by binding degenerate octamer motifs cooperatively with steroid receptors, and binds non-canonical purine-rich sites, broadening its sequence repertoire.","evidence":"In vitro transcription with purified progesterone receptor and MMTV promoter mutagenesis; methylation interference footprinting at the Aγ-globin promoter","pmids":["1846780","2007132"],"confidence":"Medium","gaps":["Basis for high-affinity binding to non-octamer site I not determined","In vivo hormone induction at endogenous loci not shown"]},{"year":1992,"claim":"Identified a repressive mode in which the glucocorticoid receptor directly binds the POU2F1 homeodomain off-DNA to inhibit its DNA-binding activity, mapping the same subdomain used by VP16.","evidence":"In vivo reporter assays, in vitro binding with purified GR, cross-linking/IP, and domain mapping","pmids":["1406672"],"confidence":"High","gaps":["Structural details of the GR-homeodomain interface not resolved"]},{"year":1994,"claim":"Confirmed that in vitro-defined POU2F1 contacts reflect genuine in vivo promoter occupancy at a chromosomal locus.","evidence":"In vivo DMS footprinting of the integrated MMTV LTR compared with in vitro methylation interference","pmids":["7787882"],"confidence":"Medium","gaps":["Limited functional follow-up","Single integrated locus examined"]},{"year":1998,"claim":"Established chromatin context as a gate for POU2F1 access, showing it cannot bind a full nucleosome but binds after ATP-dependent SWI/SNF remodeling to a tetramer-like state.","evidence":"Reconstituted chromatin particles, hydroxyl radical mapping, and SWI/SNF remodeling/factor-binding assays","pmids":["9614938"],"confidence":"High","gaps":["In vivo coupling of SWI/SNF recruitment to POU2F1 binding not demonstrated"]},{"year":2006,"claim":"Defined POU2F1 as a developmental Sox2 co-factor required in vivo for placode induction via composite Sox/octamer enhancer elements.","evidence":"Compound heterozygous mouse genetics, in vitro cooperative transactivation, and transgenic Pax6 enhancer analysis","pmids":["17140559"],"confidence":"High","gaps":["Direct biochemical contacts of the Oct1-Sox2 complex not structurally resolved"]},{"year":2013,"claim":"Linked POU2F1 activity to metabolic state through O-GlcNAcylation at T255/S728, which alters target binding, nuclear-periphery localization, and stress-gene control.","evidence":"PTM site mapping with mutagenesis, ChIP, FRAP/localization, and functional rescue under overgrowth/starvation","pmids":["23580612"],"confidence":"High","gaps":["Enzymes adding/removing O-GlcNAc on POU2F1 not identified","Mechanism coupling O-GlcNAc to lamin B1 association unclear"]},{"year":2019,"claim":"Demonstrated context-dependent roles in tissue regeneration and tumorigenesis and generated genome-wide target maps implicating mitotic, metabolic, and stress pathways.","evidence":"Conditional colon knockout, organoid/DSS/carcinogen and Apc-LOH models, and ChIP-seq","pmids":["31059499"],"confidence":"High","gaps":["Mechanistic basis of opposite tumor phenotypes across models not resolved","Direct vs indirect targets not all validated"]},{"year":2019,"claim":"Clarified that binding-site sequence/conformation dictates POU2F1 monomer versus homodimer/multimer assembly, defining how DNA shapes its functional output.","evidence":"Systematic EMSA across PORE/MORE substitution series","pmids":["31184608"],"confidence":"Medium","gaps":["Functional consequences of monomer vs dimer states at endogenous targets not tested"]},{"year":2020,"claim":"Established POU2F1 as a temporal transcription factor in retina, acting through a Pou2f1→Pou2f2⊣Nrl cascade to set the cone-versus-rod fate window.","evidence":"Retroviral misexpression, conditional knockout, promoter binding at the Nrl POU motif, and epistasis with Ikzf1/Casz1 in mouse retina","pmids":["32878923"],"confidence":"High","gaps":["Direct POU2F1 targets beyond Pou2f2 in retina not mapped","Timing signals controlling POU2F1 expression unknown"]},{"year":2024,"claim":"Identified turnover control of POU2F1 protein by TRIM21-mediated K48 ubiquitination at K272 downstream of PI3K/AKT attenuation, linking signaling to its degradation and metabolic/DNA-damage phenotypes.","evidence":"Co-IP, ubiquitination site mapping with K272 mutagenesis, TRIM21 manipulation, and in vivo CRC model","pmids":["38385081"],"confidence":"High","gaps":["Whether other E3 ligases target POU2F1 not addressed here"]},{"year":2025,"claim":"Consolidated a recurrent oncogenic theme in which POU2F1 directly drives metabolic-remodeling genes (glycolysis, lipogenesis) and feeds PI3K/AKT signaling across cancers.","evidence":"ChIP and luciferase confirmation of direct binding at ALDOA, LDHA, and DHCR24/ELOVL2 with knockdown/rescue and xenografts","pmids":["34997215","40819704","41947242"],"confidence":"Medium","gaps":["Tissue selectivity of metabolic target choice unexplained","Most evidence from individual single-lab cancer studies"]},{"year":2026,"claim":"Extended POU2F1 stability control by identifying USP18 as a deubiquitinase that opposes its degradation, regulated upstream by an lncRNA-EIF4E phase-separation axis.","evidence":"Co-IP, ubiquitination assays, EIF4E phase-separation assay, and knockdown in CRC cells","pmids":["42157946"],"confidence":"Medium","gaps":["Direct USP18 catalysis on specific POU2F1 ubiquitin sites not mapped","Single-lab evidence"]},{"year":null,"claim":"How POU2F1's combinatorial partner choice, PTM state, and binding-site conformation are integrated to select activating versus repressive outputs at specific loci in vivo remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking PTMs (O-GlcNAc, ubiquitin) to target selection","Structural basis of context-dependent activation vs repression unknown","Genome-wide direct target maps available in few cell types only"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,4,5,16,17,22]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,2,5,6,8,20,33,34]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,10]},{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,4,16,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,17]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[22,36,38]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[8,15]}],"complexes":[],"partners":["SP1","SOX2","VP16","NR3C1","PGR","TRIM21","USP18"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P14859","full_name":"POU domain, class 2, transcription factor 1","aliases":["NF-A1","Octamer-binding protein 1","Oct-1","Octamer-binding transcription factor 1","OTF-1"],"length_aa":743,"mass_kda":76.5,"function":"Transcription factor that binds to the octamer motif (5'-ATTTGCAT-3') and activates the promoters of the genes for some small nuclear RNAs (snRNA) and of genes such as those for histone H2B and immunoglobulins. Modulates transcription transactivation by NR3C1, AR and PGR (Microbial infection) In case of human herpes simplex virus (HSV) infection, POU2F1 forms a multiprotein-DNA complex with the viral transactivator protein VP16 and HCFC1 thereby enabling the transcription of the viral immediate early genes","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P14859/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/POU2F1","classification":"Not Classified","n_dependent_lines":128,"n_total_lines":1208,"dependency_fraction":0.10596026490066225},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"BANF1","stoichiometry":4.0},{"gene":"IPO5","stoichiometry":0.2},{"gene":"PASK","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/POU2F1","total_profiled":1310},"omim":[{"mim_id":"618489","title":"BROMODOMAIN-CONTAINING PROTEIN 7; BRD7","url":"https://www.omim.org/entry/618489"},{"mim_id":"611162","title":"MALARIA, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/611162"},{"mim_id":"607926","title":"HOST CELL FACTOR C2; HCFC2","url":"https://www.omim.org/entry/607926"},{"mim_id":"607394","title":"POU DOMAIN, CLASS 2, TRANSCRIPTION FACTOR 3; POU2F3","url":"https://www.omim.org/entry/607394"},{"mim_id":"606543","title":"HISTONE DEACETYLASE 9; HDAC9","url":"https://www.omim.org/entry/606543"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Endoplasmic reticulum","reliability":"Additional"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/POU2F1"},"hgnc":{"alias_symbol":["OCT1"],"prev_symbol":["OTF1"]},"alphafold":{"accession":"P14859","domains":[{"cath_id":"1.10.260.40","chopping":"282-358","consensus_level":"high","plddt":92.3842,"start":282,"end":358},{"cath_id":"1.10.10.60","chopping":"387-434","consensus_level":"high","plddt":94.6952,"start":387,"end":434}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P14859","model_url":"https://alphafold.ebi.ac.uk/files/AF-P14859-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P14859-F1-predicted_aligned_error_v6.png","plddt_mean":49.09},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=POU2F1","jax_strain_url":"https://www.jax.org/strain/search?query=POU2F1"},"sequence":{"accession":"P14859","fasta_url":"https://rest.uniprot.org/uniprotkb/P14859.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P14859/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P14859"}},"corpus_meta":[{"pmid":"3677172","id":"PMC_3677172","title":"Purification 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\"finding\": \"OTF-1 (POU2F1) was purified from HeLa nuclear extracts and shown to directly stimulate transcription of the human histone H2b gene in a reconstituted in vitro system, dependent on an intact octamer element and the TATA motif but not other H2b promoter elements. Activity was absent in G2-synchronized cells, establishing cell-cycle-dependent regulation.\",\n      \"method\": \"DNA affinity chromatography purification, SDS-PAGE renaturation, reconstituted in vitro transcription assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro transcription with purified factor, octamer-element dependency established by mutagenesis, cell-cycle control confirmed\",\n      \"pmids\": [\"3677172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"OTF-1 (POU2F1) is physically and functionally identical to the adenovirus DNA replication factor NF-III: identical SDS-PAGE mobility, same binding site and affinity at the adenovirus origin, ability to substitute for NF-III in activating adenovirus DNA replication in vitro, and NF-III can substitute for OTF-1 in H2b transcription, demonstrating a dual role in transcription and DNA replication.\",\n      \"method\": \"SDS-PAGE, DNA-binding assays, in vitro adenovirus DNA replication assay, in vitro transcription complementation assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal in vitro assays (replication, transcription, binding) with reciprocal substitution experiments in a single rigorous study\",\n      \"pmids\": [\"3413485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"OTF-1 (POU2F1) binds the TAATGARAT sequence in HSV immediate-early gene promoters. The herpes simplex virus trans-activator Vmw65 (VP16) induces formation of an additional, more-retarded complex containing OTF-1, and at least one additional cellular factor (distinct from OTF-1) is required for this complex formation.\",\n      \"method\": \"Affinity purification, electrophoretic mobility shift assay (EMSA), complementation with OTF-1-depleted nuclear extracts\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal EMSA with purified protein, depletion-complementation experiment, replicated across OTF-1 and OTF-2\",\n      \"pmids\": [\"2842768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"OTF-1 (POU2F1) and Sp1 physically interact and show cooperative binding to DNA: Sp1 binding sites stimulate transcription more strongly when paired with low-affinity OTF-1 sites than high-affinity ones, and this functional cooperation is mirrored by cooperative protein–DNA complex formation in vitro.\",\n      \"method\": \"Synthetic enhancer constructs, in vitro transcription assays, EMSA cooperative binding\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro transcription plus cooperative EMSA; functional and physical interaction demonstrated in same study\",\n      \"pmids\": [\"2191301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Purified OTF-1 (POU2F1) and OTF-2 show indistinguishable DNA-binding affinity and contacts on H2b and immunoglobulin promoters and equivalent intrinsic capacity to activate transcription from either promoter in OTF-depleted extracts. Full immunoglobulin gene transcription additionally requires a B-cell-specific component that interacts with OTFs.\",\n      \"method\": \"High-resolution DNase I footprinting, EMSA competition, reconstituted in vitro transcription with OTF-depleted HeLa and B-cell extracts\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro transcription with purified factors and depleted extracts, multiple DNA-binding assays\",\n      \"pmids\": [\"2123291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The MMTV promoter contains two degenerate octamer motifs upstream of the TATA box that bind OTF-1 (POU2F1). In vitro, mutation of these octamer motifs abolishes the stimulatory effect of purified progesterone receptor on transcription without affecting basal transcription. Progesterone and glucocorticoid receptors bound to the HRE facilitate binding of OTF-1 to these sites, revealing OTF-1 as a mediator of hormonal induction through cooperative DNA binding with hormone receptors.\",\n      \"method\": \"DNA binding assays, in vitro transcription with purified progesterone receptor, transfection with promoter mutants\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstitution with purified receptor, promoter mutagenesis, functional transcription assays, and cooperative binding demonstrated\",\n      \"pmids\": [\"1846780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"OTF-1 (POU2F1) binds two distinct sites in the Aγ-globin gene promoter: site II (octamer-related) and site I (purine-rich, -291 to -267) with equal affinity despite site I having no obvious octamer similarity, as shown by immunological identity and methylation interference footprinting.\",\n      \"method\": \"Immunological identity assay, EMSA, methylation interference footprinting\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunological identity plus footprinting in a single study; no functional transcription rescue\",\n      \"pmids\": [\"2007132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The glucocorticoid receptor (GR) negatively regulates OTF-1 (POU2F1) function in a hormone-dependent manner by directly associating with OTF-1 in solution, independent of DNA binding, resulting in repression of OTF-1 DNA-binding activity. The homeodomain subdomain of OTF-1 that interacts with VP16 is also critical for GR interaction.\",\n      \"method\": \"In vivo reporter assays, nuclear extract DNA-binding assay, in vitro incubation with purified GR, chemical cross-linking and immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (in vivo repression, in vitro binding, cross-linking/IP, domain mapping) in a single study\",\n      \"pmids\": [\"1406672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"OTF-1 (POU2F1) can bind its cognate site on the MMTV promoter assembled into an H3/H4 tetramer particle but cannot access the same site on a full histone octamer particle. SWI/SNF complex remodels the octamer particle to a tetramer-like state in an ATP-dependent manner, enabling OTF-1 binding.\",\n      \"method\": \"Chromatin reconstitution with recombinant histones, site-directed hydroxyl radical mapping, factor-binding assays on nucleosomal templates, SWI/SNF remodeling assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted chromatin particles, hydroxyl radical mapping, factor binding on defined particles, ATP-dependent remodeling assay\",\n      \"pmids\": [\"9614938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Oct-1 (Pou2f1) acts as a co-factor for Sox2 during mouse lens and nasal placode induction. Genetic combination of Sox2 and Pou2f1 hypomorphic alleles causes impaired lens placode induction and complete failure of nasal placode induction. Oct-1 and Sox2 cooperatively bind composite Sox/Octamer sites in the Pax6 lens ectoderm enhancer to drive transactivation, and these same sites are required for enhancer activity in transgenic mice.\",\n      \"method\": \"Genetic epistasis (compound heterozygous mouse mutants), in vitro transactivation assay, transgenic enhancer analysis in mice\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in mouse, in vitro cooperative binding/transactivation, and in vivo transgenic enhancer validation\",\n      \"pmids\": [\"17140559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Oct1/Pou2f1 is modified by O-linked β-N-acetylglucosamine (O-GlcNAc) at positions T255 and S728. Under anchorage-independent overgrowth conditions, O-GlcNAcylation correlates with 3-fold increased Oct1 binding to the Gadd45a promoter, transcriptional repression of Gadd45a, reduced association with lamin B1, and reduced nuclear periphery puncta. The O-GlcNAc sites are required for both Gadd45a repression under overgrowth and Gadd45a activation upon acute starvation, and for anchorage-independent survival. Specific ubiquitination sites on Oct1 were also identified.\",\n      \"method\": \"O-GlcNAc site mapping, ChIP assay, site-directed mutagenesis of modification sites, FRAP/localization imaging, functional reporter assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PTM site mapping with mutagenesis, ChIP, localization and functional rescue in single study with orthogonal methods\",\n      \"pmids\": [\"23580612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In gastric cancer cells, the ACK1 kinase phosphorylates AKT at Thr308 and Ser473, activating the AKT pathway which up-regulates POU2F1, which in turn directly binds the ECD promoter to drive ECD transcription. ECD silencing blocks ACK1-induced EMT, migration, and invasion, placing POU2F1 as a transcriptional effector downstream of ACK1/AKT in this signalling axis.\",\n      \"method\": \"SILAC proteomics, promoter binding assay, knockdown/overexpression functional assays, in vivo metastasis model, phosphorylation analysis\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — promoter binding shown, epistasis by knockdown rescue, but single lab; AKT→POU2F1 link is indirect\",\n      \"pmids\": [\"25678401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"POU2F1 directly binds the CTHRC1 promoter and activates its transcription; HPV E6/E7 proteins regulate CTHRC1 expression via an E6/E7-p53-POU2F1 axis in cervical cancer, and CTHRC1 promotes invasion by activating the Wnt/PCP signaling pathway.\",\n      \"method\": \"Promoter binding/reporter assays, gain/loss-of-function, in vitro invasion assay, in vivo metastasis model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — promoter binding shown by reporter assay, pathway epistasis by knockdown, single lab\",\n      \"pmids\": [\"28303973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"POU2F1 is regulated upstream by the AKT pathway in hepatocellular carcinoma cells, and POU2F1 overexpression reverses the inhibition of malignant phenotypes (proliferation, EMT, migration, invasion) caused by AKT knockdown, positioning POU2F1 as a key downstream effector of AKT. POU2F1 induces transcription of EMT genes Twist1, Snai1, Snai2, and ZEB1.\",\n      \"method\": \"Knockdown/overexpression epistasis, Western blotting, in vitro functional assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — epistasis by rescue overexpression, target gene expression changes; no direct promoter binding for EMT genes shown; single lab\",\n      \"pmids\": [\"28489585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"POU2F1 directly binds the promoters of fibrosis repressors IL1R2, CD69, and TGIF2 (shown by ChIP) in cardiac fibroblasts and represses their expression. Pathological substrate stiffness upregulates POU2F1, which promotes cardiac fibroblast differentiation into myofibroblasts; POU2F1 knockdown upregulates these repressors and attenuates differentiation.\",\n      \"method\": \"ChIP assay, knockdown/overexpression on polyacrylamide hydrogels and in mouse MI tissue, immunofluorescence, Western blotting\",\n      \"journal\": \"Science China. Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-confirmed direct promoter binding, functional phenotype in physiological stiffness model; single lab\",\n      \"pmids\": [\"32617828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"POU2F1 is methylation-sensitive in its DNA binding at the HSP70 promoter: hypermethylation of a distal HSP70 promoter region reduces POU2F1 binding and reduces recruitment of the NuRD chromatin-remodeling complex, resulting in higher histone H3 acetylation at the HSP70 promoter.\",\n      \"method\": \"In vitro methylation-transcription assay, in vivo MeDIP, chromatin immunoprecipitation (POU2F1 and NuRD complex), histone acetylation analysis\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for POU2F1 and NuRD at the promoter, methylation-dependent binding, multiple in vitro and in vivo methods; single lab\",\n      \"pmids\": [\"28278364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Oct1/Pou2f1 deletion in mouse colon blocks recovery from dextran sodium sulfate-induced damage and impairs organoid passaging, but preserves homeostasis. In a carcinogen-induced colon cancer model, Oct1 loss severely restricts tumorigenicity, while in an Apc-LOH model, Oct1 loss progressively increases tumor burden. Oct1 ChIP-seq identifies direct target genes associated with mitotic stability, metabolism, and stress response.\",\n      \"method\": \"Conditional gene deletion in mouse colon, organoid assays, DSS treatment model, chemical carcinogenesis model, Apc-LOH model, ChIP-seq\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in two genetic cancer models with divergent phenotypes, organoid assays, ChIP-seq; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"31059499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In developing mouse retina, Pou2f1 induces Pou2f2 expression; Pou2f2 then binds a POU motif in the Nrl (rod-inducing factor) promoter to repress its expression, thereby controlling the temporal window of cone photoreceptor production. Forced sustained Pou2f1/2 expression expands cone production; conditional inactivation of Pou2f2 increases Nrl and reduces cones. Pou2f1 is part of a cross-regulatory cascade with temporal factors Ikzf1 and Casz1.\",\n      \"method\": \"Retroviral misexpression, conditional knockout, promoter binding assay (POU motif in Nrl promoter), genetic epistasis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function and conditional KO in mouse retina, direct promoter binding, epistasis with Ikzf1/Casz1; multiple orthogonal approaches\",\n      \"pmids\": [\"32878923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"POU2F1 directly binds the promoter of TTC3-AS1 (by ChIP and DNA-affinity precipitation) and activates its transcription in gastric cancer cells. TTC3-AS1 knockdown neutralizes the pro-tumor effects of POU2F1 overexpression in vitro and in mouse GC models, placing TTC3-AS1 downstream of POU2F1.\",\n      \"method\": \"ChIP assay, DNA-affinity precipitation, luciferase reporter assay, knockdown/overexpression, in vivo mouse model\",\n      \"journal\": \"Journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmed by ChIP and DNA pulldown, functional epistasis by rescue; single lab\",\n      \"pmids\": [\"34257651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"POU2F1 directly binds and suppresses the NPR3 promoter (primarily at the -900 to -800 bp region), as shown by dual-luciferase reporter and site-directed mutagenesis assays. POU2F1 over-expression enhances cell proliferation and activates the PI3K/AKT pathway, effects reversed by NPR3 overexpression.\",\n      \"method\": \"Dual-luciferase reporter assay, site-directed mutagenesis, knockdown/overexpression, in vivo xenograft\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter binding site identified by mutagenesis, functional epistasis; single lab\",\n      \"pmids\": [\"34229087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"POU2F1 autoregulates its own gene through two mechanisms: it acts via negative feedback on the ubiquitous (U) promoter through low-affinity binding sites, and via positive feedback on the tissue-specific (L) promoter through high-affinity canonical Oct sites. Knockdown activates the U promoter and downregulates the L promoter; overexpression has opposite effects. Binding confirmed by ChIP and EMSA.\",\n      \"method\": \"ChIP, EMSA, promoter reporter assay, knockdown/overexpression in Namalwa cells\",\n      \"journal\": \"Molekuliarnaia biologiia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and EMSA confirm binding, functional reporter assays; single lab\",\n      \"pmids\": [\"34837701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"POU2F1 activates transcription of CRK, which in turn promotes PD-L1 expression in lung cancer cells. POU2F1 overexpression increases PD-L1 surface expression; knockdown of POU2F1 reduces PD-L1 and enhances anti-PD-1 efficacy in a mouse tumor model.\",\n      \"method\": \"Luciferase reporter assay (CRK promoter), overexpression/knockdown, flow cytometry, immunofluorescence, in vivo mouse tumor model with anti-PD-1\",\n      \"journal\": \"American journal of translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — promoter reporter assay, functional in vivo evidence; direct binding to CRK promoter not confirmed by ChIP; single lab\",\n      \"pmids\": [\"33594317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"POU2F1 directly binds the ALDOA promoter (by ChIP and luciferase assay) to enhance ALDOA expression, thereby promoting aerobic glycolysis, the pentose phosphate pathway, and oxaliplatin resistance in colon cancer cells.\",\n      \"method\": \"ChIP assay, dual-luciferase reporter assay, knockdown/overexpression functional assays, metabolic flux measurements\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding confirmed by ChIP, reporter, and metabolic assays; single lab\",\n      \"pmids\": [\"34997215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"C/EBPβ is a transcriptional activator of POU2F1, as confirmed by dual-luciferase reporter assay. Exercise training activates AMPK, which suppresses C/EBPβ, thereby reducing POU2F1 expression and attenuating Ang II-induced cardiac fibrosis in vivo. POU2F1 overexpression in vivo nullifies the cardioprotective effect of exercise.\",\n      \"method\": \"Dual-luciferase reporter assay, in vivo adeno-associated virus overexpression, AMPK agonist/inhibitor pharmacology, RNA sequencing\",\n      \"journal\": \"Journal of sport and health science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase confirms C/EBPβ→POU2F1 promoter activation, in vivo overexpression epistasis; single lab\",\n      \"pmids\": [\"36374849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In spinal dorsal horn neurons, POU2F1 binds to the DNMT3a promoter and activates its transcription; oxaliplatin treatment upregulates POU2F1, leading to increased DNMT3a expression, hypermethylation of the Lrfn4 promoter, and decreased LRFN4 expression, which mediates mechanical allodynia and cold hyperalgesia. Intrathecal POU2F1 siRNA prevents DNMT3a upregulation and LRFN4 downregulation.\",\n      \"method\": \"ChIP assay (POU2F1 on DNMT3a promoter), MeDIP, qPCR, siRNA knockdown in vivo, behavioral pain assays\",\n      \"journal\": \"Neurochemical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms POU2F1-DNMT3a promoter binding, in vivo siRNA epistasis; single lab\",\n      \"pmids\": [\"37592110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM21 E3 ubiquitin ligase directly interacts with POU2F1 and induces K48-linked ubiquitination at K272 of POU2F1, leading to its proteasomal degradation. DADS treatment promotes this K272 ubiquitination by upregulating TRIM21 via attenuation of PI3K/AKT signaling. Reduced POU2F1 impairs PPP flux and PRPP production, enhancing DNA damage and apoptosis in CRC cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination site mapping, K272 mutagenesis, TRIM21 knockdown/overexpression, PI3K signaling manipulation, in vivo tumor model\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — specific ubiquitination site identified by mutagenesis, writer (TRIM21) identified by Co-IP, PI3K/TRIM21/POU2F1 epistasis by rescue; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"38385081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"POU2F1 protein directly binds the -713 to -703 bp region of the Slc7a11 promoter to inhibit its transcriptional activity, as shown by dual-luciferase reporter and site-directed mutagenesis assays in rabbit melanocytes.\",\n      \"method\": \"Dual-luciferase reporter assay, site-directed mutagenesis, rabbit melanocyte culture, knockdown/overexpression\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific promoter region identified by mutagenesis, functional assay; single lab, non-human species (rabbit)\",\n      \"pmids\": [\"31137576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"POU2F1 consensus binding sites within the 5' DNA of HOXD10 and HOXD11 are required for optimal promoter activity (by luciferase reporter), and POU2F1 knockdown significantly reduces HOXD10 and HOXD11 expression and inhibits HNSCC cell proliferation.\",\n      \"method\": \"Luciferase reporter assay with mutant POU2F1 binding sites, siRNA knockdown, proliferation and invasion assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter site-dependency shown by reporter mutagenesis, functional KD phenotype; single lab\",\n      \"pmids\": [\"25301728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In gastric cancer, POU2F1 directly binds to POU2F1 binding sites within both the miR-4490 promoter (repressing miR-4490 transcription) and the USP22 promoter (activating USP22 transcription), as confirmed by ChIP and dual-luciferase reporter assays. POU2F1 promotes GC proliferation and EMT-induced metastasis through this axis.\",\n      \"method\": \"ChIP assay, dual-luciferase reporter assay, ISH, IHC, flow cytometry, in vitro/in vivo functional assays\",\n      \"journal\": \"Cellular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmed by ChIP at two target promoters, reporter assays; single lab\",\n      \"pmids\": [\"32857323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"POU2F1 binds the FAM201A promoter and transcriptionally activates it, forming a positive feedback loop with miR-146a-5p: FAM201A sponges miR-146a-5p to upregulate POU2F1, and POU2F1 in turn drives FAM201A transcription. Confirmed by ChIP and luciferase reporter assay in chondrocytes.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, miRNA sponge assay, IL-1β chondrocyte injury model\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter confirm POU2F1 binding to FAM201A promoter; feedback loop established; single lab\",\n      \"pmids\": [\"34796909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"POU2F1 directly binds and activates the promoter of TTC3-AS1 in gastric cancer (confirmed by ChIP and DNA-affinity precipitation), and LINC01564 lncRNA binds the 3'UTR of POU2F1 mRNA to stabilize it (confirmed by RIP and RNA pulldown), forming a positive regulatory loop.\",\n      \"method\": \"RIP, RNA pulldown, ChIP assay, MTT, invasion/clonogenic assay, in vivo metastasis model\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct POU2F1-3'UTR interaction by RIP/pulldown, promoter binding by ChIP; single lab\",\n      \"pmids\": [\"35562740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A CHD-associated SNP rs492554 and linked SNP rs12406992 map within a POU2F1 binding motif in the SESN2 regulatory region; the protective T allele shows preferential binding affinity to POU2F1 by EMSA and luciferase assay. POU2F1 knockdown suppresses luciferase expression driven by the T-C haplotype, demonstrating POU2F1 acts as an allele-specific transcriptional activator of SESN2.\",\n      \"method\": \"EMSA, luciferase reporter assay, POU2F1 knockdown, eQTL analysis\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and reporter with allele-specific binding and KD rescue; single lab\",\n      \"pmids\": [\"34249922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"POU2F1 directly binds the miR-29b1/a cluster promoter (shown by ChIP and luciferase) to repress miR-29b-3p and miR-29a-3p transcription. This elevates PIK3R1 and PIK3R3 (direct targets of these miRNAs), activating PI3K/Akt/mTOR signaling to promote gastric cancer cell invasion and metastasis. Co-immunoprecipitation demonstrated PIK3R1-PIK3R3 interaction.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, co-immunoprecipitation, Transwell invasion assay, in vivo metastasis model, miRNA/target validation\",\n      \"journal\": \"Chinese medical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter confirm direct binding at miR-29b1/a promoter; pathway epistasis by rescue; Co-IP for PIK3R interaction; single lab\",\n      \"pmids\": [\"39183556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The nucleotide sequence and position of substitutions at PORE (palindromic octamer-related element) and MORE (more PORE) sites determines whether Oct-1/POU2F1 binds as a monomer, homodimer, or multimer. Specific substitutions suppress dimer formation while others stimulate it, demonstrating that DNA sequence conformation of the binding site controls the character of POU2F1-DNA interaction.\",\n      \"method\": \"EMSA with nucleotide substitution series in PORE/MORE sites\",\n      \"journal\": \"Molekuliarnaia biologiia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutagenesis of binding sites with EMSA; single lab, but comprehensive substitution analysis\",\n      \"pmids\": [\"31184608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"OTF-1 (POU2F1) and NFI binding sites on the stably integrated MMTV LTR are permanently occupied in vivo in NIH3T3 and GR cells that exhibit hormone-independent MMTV expression, as shown by in vivo DMS footprinting, with guanine contacts identical to those identified by in vitro methylation interference.\",\n      \"method\": \"In vivo dimethyl sulfate (DMS) footprinting, in vitro methylation interference assay\",\n      \"journal\": \"Cellular & molecular biology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vivo footprinting validated by in vitro methylation interference; single study, limited functional follow-up\",\n      \"pmids\": [\"7787882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Bovine Oct1/POU2F1 acts as a pro-viral factor for BoHV-1 replication: CRISPR/Cas9 Oct1 knockout in MDBK cells significantly reduces viral gene expression (all three temporal gene classes) and viral replication, a phenotype rescued by re-expression of wild-type Oct1.\",\n      \"method\": \"CRISPR/Cas9 knockout, viral infection at high and low MOI, viral gene expression analysis, rescue overexpression\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean CRISPR KO with rescue, viral replication and gene expression quantified; single lab, non-human species (bovine)\",\n      \"pmids\": [\"39459888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"POU2F1 directly activates LDHA transcription in pituitary adenoma cells (confirmed by dual-luciferase reporter and ChIP assays), promoting proliferation, invasion, migration, sphere formation, and aerobic glycolysis. LDHA overexpression ameliorates PI3K/AKT pathway inactivation induced by POU2F1 silencing, placing POU2F1 upstream of LDHA and PI3K/AKT.\",\n      \"method\": \"Dual-luciferase reporter assay, ChIP assay, knockdown/overexpression, in vivo xenograft\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter confirm direct binding, PI3K/AKT epistasis by rescue; single lab\",\n      \"pmids\": [\"40819704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"POU2F1 promotes chemoresistance in colorectal cancer by stimulating MCT4 expression, thereby reducing cytosolic lactate and decreasing lactylation of PPP1R11. Reduced PPP1R11 lactylation destabilizes PPP1R11 E3 ligase activity, preventing MDR2 ubiquitination and degradation, thus stabilizing MDR2 and conferring chemoresistance.\",\n      \"method\": \"Knockdown/overexpression, MCT4 and PPP1R11 lactylation assays, MDR2 ubiquitination assay, in vivo tumor model\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic chain from POU2F1 to MCT4 to lactylation to MDR2 stability; single lab, complex mechanism requiring orthogonal validation\",\n      \"pmids\": [\"41793212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"POU2F1 directly activates transcription of DHCR24 and ELOVL2 (confirmed by ChIP and luciferase assays), driving cholesterol biosynthesis and lipid metabolic remodeling in endometrial cancer. POU2F1 knockdown reduces DHCR24 and ELOVL2 levels, proliferation, migration, and invasion, effects reversed by DHCR24/ELOVL2 restoration.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, knockdown/overexpression, xenograft model\",\n      \"journal\": \"Cancer & metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding by ChIP and reporter, functional epistasis by rescue; single lab\",\n      \"pmids\": [\"41947242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"USP18 deubiquitinase stabilizes POU2F1 by removing its ubiquitin chains; the lncRNA ABHD11-AS1 suppresses USP18 translation by binding EIF4E and disrupting its phase separation, leading to increased POU2F1 ubiquitination and proteasomal degradation in CRC cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, EIF4E phase separation assay, siRNA knockdown, Western blotting\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — USP18-POU2F1 interaction and ubiquitination confirmed; EIF4E phase separation mechanistic link; single lab\",\n      \"pmids\": [\"42157946\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"POU2F1 (Oct-1/OTF-1) is a ubiquitous POU-homeodomain transcription factor that binds octamer (ATGCAAAT) and related sequence motifs—as a monomer, homodimer (at PORE/MORE sites), or in cooperative complexes with partners such as Sox2, Sp1, hormone receptors, and viral VP16—to activate or repress target gene transcription (histone H2b, immunoglobulin genes, HOXD10/11, ALDOA, LDHA, DHCR24/ELOVL2, ECD, NPR3, miR-29b1/a cluster, and others); it also functions as the adenovirus DNA replication factor NF-III; its activity is regulated by O-GlcNAcylation at T255/S728 (integrating metabolic signals), K48-linked ubiquitination at K272 by TRIM21 (promoted by PI3K/AKT attenuation), deubiquitination by USP18, direct protein–protein repression by the glucocorticoid receptor (via the homeodomain), and promoter DNA methylation that blocks its binding; and it acts as a temporal transcription factor in retinal progenitors to control the cone-versus-rod photoreceptor fate window by inducing Pou2f2, which represses Nrl.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"POU2F1 (Oct-1/OTF-1) is a ubiquitous POU-homeodomain transcription factor that binds octamer and octamer-related DNA elements to activate or repress transcription, with binding-site sequence determining whether it engages DNA as a monomer or homodimer at PORE/MORE sites [#0, #33]. It was first purified as a sequence-specific activator of the histone H2b gene in a reconstituted system, an activity that is octamer-element dependent and lost in G2-synchronized cells, establishing cell-cycle-coupled transcriptional control [#0]. The same protein is physically and functionally identical to the adenovirus DNA replication factor NF-III, giving it a dual role in transcription and viral DNA replication [#1], and it serves as the cellular octamer-binding component recruited by herpesvirus VP16 at TAATGARAT elements [#2]; in bovine cells it acts as a pro-viral factor required for BoHV-1 gene expression and replication [#35]. POU2F1 acts combinatorially: it cooperates with Sp1 [#3], functions as a co-factor with Sox2 at composite Sox/octamer sites to drive Pax6 enhancer activity during lens and nasal placode induction [#9], and mediates hormone-receptor-dependent induction of the MMTV promoter through cooperative DNA binding with progesterone and glucocorticoid receptors [#5], while the glucocorticoid receptor can also directly bind its homeodomain to repress its DNA-binding activity [#7]. Its access to target sites is gated by chromatin state, requiring SWI/SNF-dependent nucleosome remodeling [#8] and being blocked by promoter DNA methylation [#15]. POU2F1 functions as a temporal transcription factor in retinal progenitors, inducing Pou2f2 which represses Nrl to set the cone-versus-rod photoreceptor fate window [#17], and in mouse colon it directs target genes governing mitotic stability, metabolism, and stress responses and has context-dependent roles in tumorigenesis [#16]. Across cancers POU2F1 drives metabolic and pro-tumor programs by directly binding promoters of glycolytic and lipogenic genes including ALDOA, LDHA, and DHCR24/ELOVL2 [#22, #36, #38]. Its protein level is controlled by O-GlcNAcylation at T255/S728, which integrates metabolic state into its DNA binding and nuclear-periphery localization [#10], and by ubiquitin turnover—TRIM21 catalyzes K48-linked ubiquitination at K272 driving proteasomal degradation [#25], opposed by USP18-mediated deubiquitination [#39].\",\n  \"teleology\": [\n    {\n      \"year\": 1987,\n      \"claim\": \"Established POU2F1 as a bona fide sequence-specific transcriptional activator by demonstrating it directly stimulates a target promoter through the octamer element, and that this activity is cell-cycle-regulated.\",\n      \"evidence\": \"DNA affinity purification from HeLa extracts and reconstituted in vitro transcription of the H2b gene with octamer mutagenesis\",\n      \"pmids\": [\"3677172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of G2-specific loss of activity not defined\", \"No in vivo target validation\"]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"Revealed an unexpected dual function by showing the octamer-binding transcription factor is identical to the adenovirus DNA replication factor NF-III, linking transcription and viral DNA replication machinery.\",\n      \"evidence\": \"SDS-PAGE comigration, shared binding site/affinity, and reciprocal substitution in in vitro replication and transcription assays\",\n      \"pmids\": [\"3413485\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of dual activity not resolved\", \"Relevance to cellular DNA replication not addressed\"]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"Defined POU2F1 as the host octamer-binding factor commandeered by herpesvirus VP16, and showed an additional cellular factor is required for VP16 complex assembly.\",\n      \"evidence\": \"Affinity purification, EMSA, and depletion-complementation at TAATGARAT promoters\",\n      \"pmids\": [\"2842768\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the additional cellular factor not established in this work\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Showed POU2F1 acts combinatorially with other factors, establishing cooperative protein-protein and protein-DNA interactions as a core mode of action.\",\n      \"evidence\": \"Synthetic enhancers, cooperative EMSA, and in vitro transcription with Sp1; OTF-depletion/reconstitution comparing OTF-1 and OTF-2\",\n      \"pmids\": [\"2191301\", \"2123291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of B-cell-specific co-factor for immunoglobulin transcription not defined\", \"Functional non-redundancy of OTF-1 vs OTF-2 in cells unresolved\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Demonstrated POU2F1 mediates hormonal induction by binding degenerate octamer motifs cooperatively with steroid receptors, and binds non-canonical purine-rich sites, broadening its sequence repertoire.\",\n      \"evidence\": \"In vitro transcription with purified progesterone receptor and MMTV promoter mutagenesis; methylation interference footprinting at the Aγ-globin promoter\",\n      \"pmids\": [\"1846780\", \"2007132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Basis for high-affinity binding to non-octamer site I not determined\", \"In vivo hormone induction at endogenous loci not shown\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Identified a repressive mode in which the glucocorticoid receptor directly binds the POU2F1 homeodomain off-DNA to inhibit its DNA-binding activity, mapping the same subdomain used by VP16.\",\n      \"evidence\": \"In vivo reporter assays, in vitro binding with purified GR, cross-linking/IP, and domain mapping\",\n      \"pmids\": [\"1406672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural details of the GR-homeodomain interface not resolved\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Confirmed that in vitro-defined POU2F1 contacts reflect genuine in vivo promoter occupancy at a chromosomal locus.\",\n      \"evidence\": \"In vivo DMS footprinting of the integrated MMTV LTR compared with in vitro methylation interference\",\n      \"pmids\": [\"7787882\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Limited functional follow-up\", \"Single integrated locus examined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Established chromatin context as a gate for POU2F1 access, showing it cannot bind a full nucleosome but binds after ATP-dependent SWI/SNF remodeling to a tetramer-like state.\",\n      \"evidence\": \"Reconstituted chromatin particles, hydroxyl radical mapping, and SWI/SNF remodeling/factor-binding assays\",\n      \"pmids\": [\"9614938\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo coupling of SWI/SNF recruitment to POU2F1 binding not demonstrated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined POU2F1 as a developmental Sox2 co-factor required in vivo for placode induction via composite Sox/octamer enhancer elements.\",\n      \"evidence\": \"Compound heterozygous mouse genetics, in vitro cooperative transactivation, and transgenic Pax6 enhancer analysis\",\n      \"pmids\": [\"17140559\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical contacts of the Oct1-Sox2 complex not structurally resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked POU2F1 activity to metabolic state through O-GlcNAcylation at T255/S728, which alters target binding, nuclear-periphery localization, and stress-gene control.\",\n      \"evidence\": \"PTM site mapping with mutagenesis, ChIP, FRAP/localization, and functional rescue under overgrowth/starvation\",\n      \"pmids\": [\"23580612\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymes adding/removing O-GlcNAc on POU2F1 not identified\", \"Mechanism coupling O-GlcNAc to lamin B1 association unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated context-dependent roles in tissue regeneration and tumorigenesis and generated genome-wide target maps implicating mitotic, metabolic, and stress pathways.\",\n      \"evidence\": \"Conditional colon knockout, organoid/DSS/carcinogen and Apc-LOH models, and ChIP-seq\",\n      \"pmids\": [\"31059499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic basis of opposite tumor phenotypes across models not resolved\", \"Direct vs indirect targets not all validated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Clarified that binding-site sequence/conformation dictates POU2F1 monomer versus homodimer/multimer assembly, defining how DNA shapes its functional output.\",\n      \"evidence\": \"Systematic EMSA across PORE/MORE substitution series\",\n      \"pmids\": [\"31184608\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequences of monomer vs dimer states at endogenous targets not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established POU2F1 as a temporal transcription factor in retina, acting through a Pou2f1→Pou2f2⊣Nrl cascade to set the cone-versus-rod fate window.\",\n      \"evidence\": \"Retroviral misexpression, conditional knockout, promoter binding at the Nrl POU motif, and epistasis with Ikzf1/Casz1 in mouse retina\",\n      \"pmids\": [\"32878923\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct POU2F1 targets beyond Pou2f2 in retina not mapped\", \"Timing signals controlling POU2F1 expression unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified turnover control of POU2F1 protein by TRIM21-mediated K48 ubiquitination at K272 downstream of PI3K/AKT attenuation, linking signaling to its degradation and metabolic/DNA-damage phenotypes.\",\n      \"evidence\": \"Co-IP, ubiquitination site mapping with K272 mutagenesis, TRIM21 manipulation, and in vivo CRC model\",\n      \"pmids\": [\"38385081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other E3 ligases target POU2F1 not addressed here\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Consolidated a recurrent oncogenic theme in which POU2F1 directly drives metabolic-remodeling genes (glycolysis, lipogenesis) and feeds PI3K/AKT signaling across cancers.\",\n      \"evidence\": \"ChIP and luciferase confirmation of direct binding at ALDOA, LDHA, and DHCR24/ELOVL2 with knockdown/rescue and xenografts\",\n      \"pmids\": [\"34997215\", \"40819704\", \"41947242\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tissue selectivity of metabolic target choice unexplained\", \"Most evidence from individual single-lab cancer studies\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extended POU2F1 stability control by identifying USP18 as a deubiquitinase that opposes its degradation, regulated upstream by an lncRNA-EIF4E phase-separation axis.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, EIF4E phase-separation assay, and knockdown in CRC cells\",\n      \"pmids\": [\"42157946\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct USP18 catalysis on specific POU2F1 ubiquitin sites not mapped\", \"Single-lab evidence\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How POU2F1's combinatorial partner choice, PTM state, and binding-site conformation are integrated to select activating versus repressive outputs at specific loci in vivo remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking PTMs (O-GlcNAc, ubiquitin) to target selection\", \"Structural basis of context-dependent activation vs repression unknown\", \"Genome-wide direct target maps available in few cell types only\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 4, 5, 16, 17, 22]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 2, 5, 6, 8, 20, 33, 34]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 10]},\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 4, 16, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 17]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [22, 36, 38]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [8, 15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SP1\", \"SOX2\", \"VP16\", \"NR3C1\", \"PGR\", \"TRIM21\", \"USP18\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}