{"gene":"KLF9","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2014,"finding":"Nrf2 directly stimulates KLF9 expression in response to elevated ROS above a critical threshold; KLF9 in turn binds to promoters of ROS-metabolism genes and suppresses thioredoxin reductase 2 expression, creating a feedforward loop that amplifies oxidative stress and promotes cell death. KLF9 deficiency was required for pathogenesis of bleomycin-induced pulmonary fibrosis in mice.","method":"Promoter binding (ChIP), gene expression profiling, KLF9 knockout/knockdown in cultured cells and mouse tissues, in vivo bleomycin model","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (ChIP, KO mouse, cell knockdown, in vivo disease model), replicated across cell types and in vivo","pmids":["24613345"],"is_preprint":false},{"year":2010,"finding":"KLF9 binds directly to two GC-box sites in the PPARγ2 proximal promoter (identified by promoter deletion/mutation analysis) and synergistically activates PPARγ2 transcription through direct protein-protein interaction with C/EBPα. PPARγ2 overexpression rescues impaired adipogenesis caused by KLF9 knockdown, placing KLF9 upstream of PPARγ2 in the adipogenic cascade.","method":"Promoter deletion/mutation analysis, Co-IP (KLF9–C/EBPα interaction), RNAi knockdown, overexpression rescue","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — promoter mutagenesis combined with Co-IP and epistasis rescue, single lab but multiple orthogonal methods","pmids":["20725087"],"is_preprint":false},{"year":2017,"finding":"KLF9 interacts physically with MAPK10/JNK3 kinase; JNK3 is critical for KLF9's axon-growth-suppressive activity. Interfering with the JNK3-binding domain of KLF9, or mutating phosphorylation acceptor sites Ser106 and Ser110, abolishes KLF9-mediated neurite growth suppression in vitro and promotes optic nerve regeneration in vivo.","method":"Co-IP (KLF9–JNK3 interaction), site-directed mutagenesis (Ser106/Ser110), shRNA knockdown in vivo (optic nerve crush rat model), in vitro neurite outgrowth assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — binding partner identified by Co-IP, functional mutagenesis of phospho-sites, in vitro and in vivo confirmation","pmids":["28871032"],"is_preprint":false},{"year":2004,"finding":"KLF9/BTEB1 functionally interacts with PR-A and PR-B isoforms of the progesterone receptor in endometrial epithelial cells. Bteb1-null female mice show uterine hypoplasia, reduced implantation sites, and decreased expression of implantation genes Hoxa10 and cyclin D3, demonstrating that KLF9 is a functionally relevant PR co-regulator in uterine stroma.","method":"Bteb1 knockout mouse, uterine gene expression analysis, implantation phenotyping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with specific molecular and reproductive phenotypes, previously established in vitro PR interaction","pmids":["15117941"],"is_preprint":false},{"year":2011,"finding":"KLF9 is upregulated in multiple myeloma cells by bortezomib via HDAC inhibition (not ER stress). KLF9 binds the promoter of the pro-apoptotic gene NOXA, and KLF9 knockdown impairs NOXA upregulation and apoptosis induced by bortezomib or LBH589; KLF9 overexpression induces apoptosis in a partially NOXA-dependent manner.","method":"ChIP (KLF9 binding to NOXA promoter), gene expression profiling, siRNA knockdown, overexpression, HDAC inhibitor treatment","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP confirmation of promoter occupancy, loss-of-function/gain-of-function with defined apoptotic readout, mechanistic link to HDAC inhibition pathway","pmids":["22144178"],"is_preprint":false},{"year":2014,"finding":"KLF9 functions as a genome-wide transcriptional repressor in glioblastoma stem-like cells; it represses integrin α6 (ITGA6), and this ITGA6 repression is required for KLF9's capacity to inhibit glioblastoma cell stemness and tumorigenicity.","method":"Genome-wide ChIP-seq mapping of KLF9 targets, ITGA6 rescue experiments, sphere formation and tumor assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genome-wide occupancy mapping plus epistasis rescue experiment, single lab with two orthogonal methods","pmids":["25288800"],"is_preprint":false},{"year":2014,"finding":"KLF9 directly binds GC boxes within the proximal p53 promoter to activate p53 transcription, and also increases p53 protein stability (demonstrated by cycloheximide chase), thereby suppressing hepatocellular carcinoma growth in vitro and in vivo.","method":"Promoter binding (ChIP, reporter assay), cycloheximide chase (protein stability), xenograft tumor model","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay for direct promoter binding plus protein stability experiment, single lab","pmids":["25242357"],"is_preprint":false},{"year":2007,"finding":"BTEB1/KLF9 binds GC-rich sequences in the Xenopus TRβA gene proximal promoter in vitro and associates with the TRβA promoter in vivo in a T3- and developmental stage-dependent manner (ChIP). Induced BTEB1 expression accelerates and enhances TRβA autoinduction; this enhancement is lost with N-terminal truncation but not with zinc-finger DNA-binding mutations, indicating that BTEB1 can act through protein-protein interactions rather than direct DNA binding in this context.","method":"Electrophoretic mobility shift assay (EMSA), ChIP, BTEB1 overexpression in XTC-2 cells, N-terminal truncation and zinc-finger point mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro binding + in vivo ChIP + mutagenesis distinguishing DNA-binding vs. protein-protein interaction mechanism","pmids":["18045867"],"is_preprint":false},{"year":2010,"finding":"BTEB1/KLF9 acts as both a transcriptional activator and repressor of the FGFR1 promoter through the same Sp1-like binding element at -59 bp during myogenesis: it activates FGFR1 in proliferating myoblasts and represses it in differentiating myotubes. BTEB1 protein is nuclear-localized in both cell types.","method":"Reporter assay (FGFR1 promoter deletion/mutation), nuclear localization (immunofluorescence), overexpression in myoblasts and myotubes","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter assay with element mapping, direct localization experiment, single lab","pmids":["20554758"],"is_preprint":false},{"year":1999,"finding":"BTEB-1/KLF9 binds to an autoregulatory element (A32) in the AP-2α gene promoter in a mutually exclusive manner with AP-2 and AP-2rep, and acts as a strong transcriptional activator of the AP-2α promoter in transfection assays.","method":"Electrophoretic mobility shift assay (EMSA), expression library screening, transient transfection reporter assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus functional reporter assay, single lab, two complementary methods","pmids":["9858544"],"is_preprint":false},{"year":2018,"finding":"XBP1s (activated by high-level ER stress) binds to an evolutionarily conserved lower-affinity site in the KLF9 promoter to activate KLF9 transcription; KLF9 in turn induces TMEM38B and ITPR1 (regulators of ER calcium storage), promoting calcium release from the ER and exacerbating ER stress and cell death. Klf9 deficiency attenuates tunicamycin-induced ER stress in mouse liver.","method":"Promoter binding (ChIP for XBP1s at KLF9 promoter), luciferase reporter assay, KLF9 knockout mouse (liver ER stress model), gene expression analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus reporter plus KO mouse with mechanistic validation of downstream targets, multiple orthogonal methods","pmids":["30282030"],"is_preprint":false},{"year":2015,"finding":"KLF9 recruits to the ISG15 promoter (ChIP) and represses ISG15 expression; loss of KLF9 in Apc(Min/+) mice increases colon adenoma burden associated with upregulation of interferon-induced genes including ISG15, and ISG15 suppresses apoptosis in colorectal cancer cells.","method":"Genetic epistasis (Apc(Min/+)/Klf9 genotype comparison), ChIP (KLF9 at ISG15 promoter), siRNA knockdown in HT29 cells, microarray","journal":"Carcinogenesis","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis plus ChIP plus cell-line KD, multiple orthogonal methods","pmids":["26210742"],"is_preprint":false},{"year":2017,"finding":"KLF9 is directly regulated by thyroid hormone receptor (TR) in a TR-dependent manner in vivo and in vitro. Klf9 knockdown in zebrafish impairs hematopoietic development including erythroid maturation and T lymphopoiesis, placing KLF9 downstream of the TR-KLF9 axis in hematopoiesis.","method":"T3 treatment with TR knockdown, in vivo zebrafish klf9 morpholino knockdown, transcriptome sequencing of thymus","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — TR-dependence shown in vivo and in vitro, zebrafish epistasis with specific hematopoietic phenotype","pmids":["28972010"],"is_preprint":false},{"year":2020,"finding":"KLF9 directly binds the Pgc1α gene promoter to stimulate its expression, promoting thermogenesis in brown and beige fat. Fat-specific Klf9 transgenic mice show increased thermogenesis and resistance to diet-induced obesity; Klf9-mutant mice show impaired thermogenic gene expression, reduced respiration, obesity, and cold sensitivity.","method":"ChIP (KLF9 binding to Pgc1α promoter), fat-specific Klf9 transgenic and mutant mice, metabolic phenotyping, Ucp1-dependent thermogenesis assay","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus transgenic/KO mouse models with defined metabolic phenotypes, multiple orthogonal methods","pmids":["32994275"],"is_preprint":false},{"year":2019,"finding":"KLF9 directly inhibits MMP28 transcription by binding to its promoter (shown by ChIP-seq/ENCODE data and dual-luciferase assay), and forced MMP28 re-expression rescues the invasion/metastasis suppression caused by KLF9 overexpression in gastric cancer cells in vivo.","method":"ChIP-seq (ENCODE), dual-luciferase promoter assay, MMP28 rescue in vivo","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter occupancy from existing ChIP-seq validated by luciferase assay, in vivo rescue, single lab","pmids":["30913394"],"is_preprint":false},{"year":2019,"finding":"BRAFV600E signaling transcriptionally upregulates KLF9; KLF9-dependent ROS are required for full-scale ERK1/2 activation and cell proliferation downstream of BRAFV600E in premalignant melanocytes. PTEN loss renders ERK1/2 activation insensitive to KLF9 and ROS.","method":"Klf9 knockout crossed with BrafCA and BrafCA/Pten-/- mouse models, N-acetylcysteine antioxidant treatment phenocopy, ERK1/2 phosphorylation analysis","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis with two conditional mouse models, chemical phenocopy, defined molecular readout","pmids":["30664687"],"is_preprint":false},{"year":2013,"finding":"KLF9 binds the KLF-binding element at position -874 of the mouse C/EBPβ promoter (ChIP), enhances C/EBPβ expression, and drives early-phase adipogenesis in 3T3-L1 cells; siRNA knockdown of KLF9 reduces C/EBPβ expression and lipid accumulation.","method":"ChIP (KLF9 at C/EBPβ promoter), siRNA knockdown, Oil Red O staining","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus loss-of-function with specific molecular readout, single lab","pmids":["24220850"],"is_preprint":false},{"year":2010,"finding":"KLF9 loss in mice and human endometrial stromal cells enhances BMP2 expression, while recombinant BMP2 attenuates KLF9 mRNA; KLF13 knockdown abrogates BMP2-mediated inhibition of KLF9, revealing cross-regulation among BMP2, KLF9, and KLF13 in progesterone-sensitive uterine stromal differentiation.","method":"Klf9 null mice, KLF9 siRNA in human endometrial stromal cells (HESCs), BMP2 treatment, KLF13 siRNA epistasis","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological epistasis in two systems (mouse and human cells), single lab","pmids":["20410205"],"is_preprint":false},{"year":2015,"finding":"In HepG2 liver cells and mouse and human primary hepatocytes, T3 induces KLF9 in a thyroid hormone receptor (TR)-dependent manner; KLF9 then regulates hundreds of target genes and cooperates with T3/TR to regulate Notch signaling pathway genes, including in human ESC and iPSC hepatocyte differentiation contexts.","method":"KLF9 knockdown (siRNA), microarray gene expression profiling, T3 + KD epistasis in HepG2 and primary hepatocytes and stem cells","journal":"Stem cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis knockdown in multiple cell types with transcriptomic validation, single lab","pmids":["25330987"],"is_preprint":false},{"year":2019,"finding":"KLF9 directly binds to repressive KLF9 binding elements (RKBE; 5′-CA/GCCC-3′) in the Prdx6 promoter to repress Prdx6 transcription; high-dose SFN-induced Nrf2 activates KLF9 through an ARE in the KLF9 promoter, and KLF9 then suppresses PRDX6, increasing ROS and cell death. KLF9 depletion reverses this.","method":"Promoter binding analysis (RKBE elements), KLF9 knockdown (shRNA), gene expression analysis, ROS measurement","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter element analysis and KD with ROS/viability readouts, single lab","pmids":["31569690"],"is_preprint":false},{"year":2020,"finding":"Glucocorticoid receptor (GR) binds to four glucocorticoid response element (GRE)-containing sites near the KLF9 locus (two proximal, two distal) upon glucocorticoid treatment; these GBSs produce enhancer RNAs (eRNAs) and loop to the KLF9 TSS. CBP/p300 silencing reduces proximal GBS activity but not KLF9 expression, indicating GRE-dependent distal enhancers drive glucocorticoid induction of KLF9.","method":"ChIP-seq (GR binding), GRO-seq (eRNA), chromatin looping (3C-related), luciferase reporter with GRE mutations, CBP/p300 siRNA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple ChIP-seq + GRO-seq + looping + mutagenesis in cell lines and primary HBE cells, mechanistically comprehensive","pmids":["33184061"],"is_preprint":false},{"year":2020,"finding":"In zebrafish larvae, klf9 is a key glucocorticoid receptor (GR)-dependent feedforward transcriptional regulator: klf9 is underexpressed in GR-mutant larvae and strongly induced by cortisol; Klf9 loss-of-function (CRISPR) reveals that Klf9 mediates upregulation of pro-inflammatory genes in response to chronic cortisol exposure.","method":"CRISPR-Cas9 GR and klf9 mutants, RNA-seq transcriptomics, cortisol treatment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR double mutant epistasis with RNA-seq, single lab, zebrafish model","pmids":["32651405"],"is_preprint":false},{"year":2023,"finding":"KLF9 directly binds to the TLR2 promoter in macrophages (ChIP), enhancing TLR2 expression and subsequently activating NF-κB and MAPK inflammatory signaling after myocardial infarction; KLF9 deficiency prevents adverse cardiac remodeling and suppresses inflammatory responses in this context.","method":"ChIP (KLF9 at TLR2 promoter), KLF9 knockdown in macrophages, myocardial infarction mouse model, NF-κB/MAPK signaling analysis","journal":"The Korean journal of physiology & pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus KD with defined signaling readout and in vivo model, single lab","pmids":["36815257"],"is_preprint":false},{"year":2022,"finding":"KLF9 promotes intestinal Asbt (apical sodium-dependent bile acid transporter) expression by binding to the Asbt promoter; intestine-specific Klf9 deletion reduces bile acid reabsorption, while intestinal Klf9 overexpression increases serum bile acid levels and reduces fecal bile acids. Reabsorbed bile acid regulates hepatic FGF15 and bile acid synthetic enzymes.","method":"Systemic and intestine-specific Klf9 KO mice, Klf9 intestinal transgenic mice, promoter binding assay, bile acid quantification","journal":"Acta pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO and transgenic mouse models with molecular promoter binding, single lab","pmids":["35105957"],"is_preprint":false},{"year":2024,"finding":"KLF9 controls cardiac mitochondrial homeostasis: cardiac-specific Klf9 KO causes hypertrophic cardiomyopathy with mitochondrial fragmentation and impaired respiration; KLF9 regulates PGC-1α and its target genes (energy metabolism) and controls Mfn2 expression to regulate mitochondrial dynamics and mitophagy. AAV-mediated Mfn2 rescue in Klf9-CKO hearts restores cardiac function.","method":"Cardiac-specific Klf9 KO and transgenic mice, angiotensin II model, mitochondrial function assays, AAV-Mfn2 rescue","journal":"Nature cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Strong — cardiac-specific KO and transgenic plus AAV rescue of downstream target, multiple mechanistic readouts, single rigorous study","pmids":["39528719"],"is_preprint":false},{"year":2023,"finding":"KLF9 directly binds the KLF9 promoter in the KLF9/CYP1A1 axis; PM2.5 stimulates KLF9 expression, and KLF9 binds the CYP1A1 promoter to drive CYP1A1 expression, activating oxidative stress and mitochondrial apoptosis pathways in trophoblasts.","method":"RNA-seq, ChIP (KLF9 at CYP1A1 promoter), KLF9 knockdown in HTR8/SVneo cells","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus loss-of-function with transcriptomic confirmation, single lab","pmids":["37737576"],"is_preprint":false},{"year":2021,"finding":"KLF9 represses PRDX6 expression in neuronal cells under hyperglycemic and bupivacaine conditions; KLF9 deficiency (shRNA) increases PRDX6, reduces ROS and mitochondrial dysfunction; PRDX6 knockdown abolishes the protective effect of KLF9 deficiency, placing PRDX6 downstream of KLF9-mediated oxidative stress.","method":"shRNA KLF9 knockdown, siRNA-Prdx6, ROS measurement, mitochondrial membrane potential assay, Western blot","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function epistasis with specific mechanistic readout, single lab","pmids":["33547545"],"is_preprint":false},{"year":2022,"finding":"KLF9 directly binds the GSDMD promoter (luciferase reporter and ChIP) and activates GSDMD transcription; KLF9 knockout reduces GSDMD expression and attenuates LPS-induced inflammatory cytokine release and lung injury in mice.","method":"Luciferase reporter assay, ChIP, KLF9 KO mice, LPS-induced ALI model, ELISA for cytokines","journal":"Autoimmunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter plus KO mouse model, single lab","pmids":["35993279"],"is_preprint":false},{"year":2022,"finding":"KLF9 directly binds the GRK5 promoter (ChIP) to activate GRK5 transcription; GRK5 then phosphorylates HDAC6, promoting chondrocyte ECM degradation and apoptosis in osteoarthritis. GRK5 knockdown eliminates the effects of KLF9 overexpression; HDAC6 inhibition abolishes effects of GRK5 overexpression.","method":"ChIP (KLF9 at GRK5 promoter), KLF9 KD/OE in chondrocytes, GRK5 epistasis KD, HDAC6 inhibitor (TubastatinA), OA rat model","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus multi-step epistasis, single lab","pmids":["39779910"],"is_preprint":false},{"year":2023,"finding":"KLF9 directly binds promoter regions of mesenchymal genes in hepatocellular carcinoma cells (ChIP), repressing their expression and reversing the EMT program; KLF9 is itself directly suppressed by the mesenchymal transcription factor Slug, creating a negative feedback loop between KLF9 and EMT.","method":"ChIP (KLF9 at mesenchymal gene promoters), KLF9 OE/KD with migration/metastasis assays, Slug-KLF9 promoter repression","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional KO/OE with in vivo metastasis model, single lab","pmids":["37400979"],"is_preprint":false},{"year":2021,"finding":"KLF9 overexpression in hepatocytes induces CD36 expression, increasing fatty acid uptake and triglyceride accumulation; liver-specific Klf9 knockout reduces CD36 expression and alleviates fatty liver in high-fat diet-fed mice, placing KLF9 upstream of CD36 in hepatic lipid metabolism.","method":"Adenovirus-mediated Klf9 OE/KD in primary hepatocytes, liver-specific Klf9 KO mice, CD36 mRNA/protein analysis, Oil Red O staining","journal":"Sheng li xue bao / Acta physiologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO and adenoviral OE/KD with molecular and phenotypic readouts, single lab","pmids":["34708234"],"is_preprint":false},{"year":2022,"finding":"KLF9 binds to the SDF-1 promoter (ChIP and dual-luciferase assay) to repress SDF-1 transcription, reducing SDF-1/CXCR4 signaling and suppressing renal cell carcinoma cell proliferation, invasion, and migration. Recombinant SDF-1 rescues the inhibitory effect of KLF9 overexpression.","method":"ChIP, dual-luciferase assay, KLF9 siRNA/pcDNA overexpression, SDF-1 protein rescue","journal":"The Kaohsiung journal of medical sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase plus epistasis rescue, single lab","pmids":["37010151"],"is_preprint":false},{"year":2022,"finding":"KLF9 binds the DDAH2 promoter and negatively regulates DDAH2 expression (luciferase reporter and ChIP); KLF9 silencing increases DDAH2 and reduces apoptosis, inflammation, and oxidative stress in high-glucose trophoblast cells; DDAH2 inhibition reverses these protective effects.","method":"Luciferase reporter assay, ChIP, KLF9 siRNA, DDAH2 siRNA epistasis, in vivo STZ-GDM mouse model","journal":"Bioengineered","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP + reporter + epistasis, single lab","pmids":["34787071"],"is_preprint":false},{"year":2025,"finding":"NAT10-mediated N4-acetylcytidine (ac4C) modification of KLF9 mRNA enhances KLF9 mRNA stability and translation; NAT10 overexpression promotes adipogenesis via KLF9, and NAT10 inhibition (Remodelin) reduces adipose expansion in HFD mice by suppressing KLF9 ac4C modification. KLF9 subsequently activates the CEBPA/B-PPARG pathway.","method":"acRIP-seq, RNA-seq, acRIP-PCR (KLF9 mRNA as NAT10 target), dual-luciferase reporter (NAT10 motif binding), NAT10 KD/OE in hADSCs and 3T3-L1, AAV-shRNA-NAT10 in vivo, Remodelin treatment","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ac4C modification mapped by acRIP-seq, validated by acRIP-PCR and luciferase, multiple in vitro and in vivo systems, novel post-transcriptional mechanism","pmids":["40123006"],"is_preprint":false},{"year":2021,"finding":"In triple negative breast cancer cells, disruption of SIN3A-PF1 interaction increases KLF9 occupancy at ITGA6 and ITGB1 promoters (ChIP); KLF9 represses ITGA6 and ITGB1 expression, and KLF9 knockdown re-expresses both integrins and restores the invasive phenotype, functionally linking KLF9 to SIN3A complex-mediated repression of invasion.","method":"ChIP (KLF9 at ITGA6/ITGB1 promoters), KLF9 siRNA rescue experiment, RNA-seq","journal":"Translational oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus rescue KD with invasion phenotype, single lab","pmids":["34968869"],"is_preprint":false},{"year":2022,"finding":"KLF9 binds directly to the KLF9 promoter (transcription factor-promoter interaction) and activates TRIM33 transcription (ChIP and dual-luciferase assay); TRIM33 overexpression suppresses TNF-α-induced proliferation, invasion and inflammation in synovial fibroblasts, and KLF9 downregulation reverses TRIM33-mediated suppression.","method":"ChIP, dual-luciferase reporter, KLF9 and TRIM33 siRNA, TNF-α-induced MH7A cell model","journal":"Immunity, inflammation and disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter plus epistasis, single lab","pmids":["36301038"],"is_preprint":false},{"year":2023,"finding":"KLF9 binds to the miR-494-3p promoter and increases miR-494-3p expression (ChIP and dual-luciferase); KLF9 also binds the RGS2 promoter to promote RGS2 expression. In COPD context, KLF9-driven miR-494-3p negatively regulates PTEN, facilitating NLRP3 inflammasome activation and inflammation.","method":"ChIP (KLF9 at miR-494-3p and/or PTEN/RGS2 promoters), dual-luciferase reporter, COPD cell and mouse models","journal":"Immunity, inflammation and disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter, single lab, mechanistic pathway established","pmids":["37904708"],"is_preprint":false},{"year":2023,"finding":"In cardiomyocytes, Klf9 is a direct early target of glucocorticoid receptor (GR) activation; Klf9 ChIP-seq identified 2150 Klf9-bound genes after dexamethasone treatment. Klf9 knockdown reverses GR-induced changes in 1640 genes enriched in metabolic pathways; Klf9 KD inhibits Dex-induced increases in glycolytic function and mitochondrial spare respiratory capacity.","method":"Klf9 ChIP-seq (in Dex-treated cardiomyocytes), RNA-seq with Klf9 siRNA, glycolysis stress test, mitochondrial stress test","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP-seq plus transcriptomics plus functional metabolic assays in cardiomyocytes, multiple orthogonal methods","pmids":["37690661"],"is_preprint":false},{"year":2012,"finding":"Klf9 is necessary and sufficient for Purkinje cell survival in organotypic culture in the absence of trophic factors: Klf9 overexpression increases survival from 40% to 88%; Klf9 knockdown reduces survival to 14%; Klf9 KO reduces survival by half. The absence of Klf9 can be rescued by IGF-1 and NT3 trophic factors.","method":"Lentiviral Klf9 OE/KD in organotypic cerebellar cultures, Klf9 KO mice, trophic factor rescue (IGF-1, NT3)","journal":"Molecular and cellular neurosciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — OE, KD, and KO with trophic factor epistasis, multiple genetic manipulations yielding consistent survival phenotype","pmids":["23201237"],"is_preprint":false},{"year":2021,"finding":"miR-26a targets KLF9 in neuronal cells; KLF9 suppresses TRAF2 and KLF2 expression, facilitating neuronal damage. ASC-derived extracellular vesicle-delivered miR-26a inhibits KLF9, relieving this suppression and reducing neuronal damage in cerebral ischemia/reperfusion models in vitro and in vivo.","method":"miR-26a target validation (luciferase), miR-26a/KLF9 gain- and loss-of-function in OGD/RP cell model and mouse ischemia model, Western blot for TRAF2/KLF2","journal":"Adipocyte","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — miRNA target validation plus in vitro and in vivo epistasis, single lab","pmids":["34311651"],"is_preprint":false},{"year":2025,"finding":"KLF9 activates lncRNA UCA1 transcription by directly binding its promoter; UCA1 recruits EZH2 to the p27 promoter region, increasing H3K27me3 enrichment and epigenetically suppressing p27 expression, thereby exacerbating cardiomyocyte hypertrophy in HOCM. UCA1 overexpression or p27 downregulation reverses the protective effect of KLF9 knockdown.","method":"ChIP (KLF9 at UCA1 promoter; EZH2/H3K27me3 at p27 promoter), UCA1/p27 rescue experiments, ISO-induced cardiomyocyte hypertrophy model","journal":"International journal of experimental pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP at two levels of pathway plus epistasis rescue, single lab","pmids":["39909852"],"is_preprint":false}],"current_model":"KLF9 (also known as BTEB1) is a Krüppel-like zinc-finger transcription factor that functions as both a transcriptional activator and repressor by binding GC-rich promoter elements; it is induced by thyroid hormone (via TR), glucocorticoids (via GR with multiple GRE-containing enhancers), Nrf2, XBP1s (under high ER stress), BRAFV600E, and ATF4, and in turn directly regulates downstream targets including PPARγ2 (adipogenesis), PGC-1α (thermogenesis/mitochondrial biogenesis), Mfn2 (mitochondrial dynamics), thioredoxin reductase 2 and PRDX6 (ROS clearance), NOXA (apoptosis), ISG15 (immune/apoptosis), MMP28, GSDMD, TLR2, SDF-1, ITGA6/ITGB1, and CD36 (lipid uptake); its activity is modulated by JNK3-mediated phosphorylation at Ser106/Ser110 (suppressing axon growth), by protein-protein interaction with C/EBPα and progesterone receptor, and at the post-transcriptional level by NAT10-mediated ac4C modification of its mRNA; collectively, KLF9 acts as a central feedforward amplifier of oxidative stress, a regulator of mitochondrial and metabolic homeostasis, a modulator of cell differentiation (adipogenesis, oligodendrocyte, neuronal, hematopoietic), and a context-dependent tumor suppressor."},"narrative":{"mechanistic_narrative":"KLF9 (BTEB1) is a Krüppel-like zinc-finger transcription factor that binds GC-rich promoter elements and acts as both an activator and a repressor depending on cellular context, functioning as a hub that couples hormonal and stress signals to oxidative-stress, metabolic, differentiation, and tumor-suppressive programs [PMID:18045867, PMID:20554758, PMID:24613345]. It is a direct, hormone-dependent target of multiple upstream signals: thyroid hormone receptor [PMID:18045867, PMID:28972010], glucocorticoid receptor through GRE-containing distal enhancers that loop to the KLF9 TSS [PMID:33184061, PMID:32651405, PMID:37690661], the oxidative-stress sensor Nrf2 [PMID:24613345, PMID:31569690], XBP1s under high ER stress [PMID:30282030], and BRAFV600E signaling [PMID:30664687], and its mRNA is stabilized post-transcriptionally by NAT10-mediated ac4C modification [PMID:40123006]. A recurring theme is a feedforward amplification of oxidative stress: induced by Nrf2 above a ROS threshold, KLF9 represses antioxidant genes including thioredoxin reductase 2 and PRDX6, thereby raising ROS and promoting cell death [PMID:24613345, PMID:31569690, PMID:33547545]. KLF9 controls mitochondrial and metabolic homeostasis by directly activating PGC-1α and regulating Mfn2 to govern mitochondrial dynamics, energy metabolism, and thermogenesis in cardiac and adipose tissue [PMID:32994275, PMID:39528719], and it drives adipogenic and hepatic lipid programs through PPARγ2/C/EBP induction and CD36 [PMID:20725087, PMID:24220850, PMID:34708234]. As a context-dependent tumor suppressor it activates p53 and pro-apoptotic NOXA while repressing pro-invasive and stemness targets such as ITGA6/ITGB1, MMP28, SDF-1, ISG15, and mesenchymal/EMT genes [PMID:25242357, PMID:22144178, PMID:25288800, PMID:34968869, PMID:30913394, PMID:37010151, PMID:26210742, PMID:37400979]. KLF9 also shapes differentiation and survival in neuronal, hematopoietic, and uterine systems—supporting Purkinje cell survival [PMID:23201237], promoting hematopoietic maturation downstream of TR [PMID:28972010], and acting as a progesterone-receptor co-regulator required for uterine implantation [PMID:15117941]. Its activity is further tuned by direct protein-protein interactions, including synergy with C/EBPα [PMID:20725087] and JNK3 binding with phosphorylation at Ser106/Ser110 that drives axon-growth suppression [PMID:28871032].","teleology":[{"year":1999,"claim":"Established that BTEB1/KLF9 is a sequence-specific transcriptional activator, defining its core activity before its physiological roles were known.","evidence":"EMSA and reporter assays showing binding to the AP-2α autoregulatory element","pmids":["9858544"],"confidence":"Medium","gaps":["No in vivo target validation","Mechanism of activation versus repression not resolved"]},{"year":2004,"claim":"Demonstrated that KLF9 is a physiologically required progesterone-receptor co-regulator, linking the factor to reproductive/uterine biology in vivo.","evidence":"Bteb1-null mice with uterine hypoplasia and reduced implantation gene expression","pmids":["15117941"],"confidence":"High","gaps":["Direct PR-KLF9 binding interface not mapped","Downstream target promoters not defined"]},{"year":2007,"claim":"Showed that KLF9 can act through protein-protein interaction rather than direct DNA binding in autoinduction of thyroid hormone receptor, refining how it enhances transcription.","evidence":"EMSA, ChIP, and N-terminal versus zinc-finger mutants in Xenopus XTC-2 cells","pmids":["18045867"],"confidence":"High","gaps":["Identity of the bridging partner in protein-protein mode unknown","Generalizability to mammalian promoters untested here"]},{"year":2010,"claim":"Placed KLF9 upstream in the adipogenic cascade and identified a direct C/EBPα cofactor interaction driving PPARγ2 induction.","evidence":"Promoter mutagenesis, Co-IP, and PPARγ2 overexpression rescue of knockdown","pmids":["20725087"],"confidence":"High","gaps":["Structural basis of KLF9-C/EBPα interaction not defined"]},{"year":2010,"claim":"Revealed KLF9 as a context-switchable dual activator/repressor at a single element, explaining bidirectional control during differentiation.","evidence":"FGFR1 promoter reporter mapping and nuclear localization in myoblasts versus myotubes","pmids":["20554758"],"confidence":"Medium","gaps":["What determines the activator-to-repressor switch (cofactors) unknown"]},{"year":2014,"claim":"Defined the central feedforward oxidative-stress amplifier model: Nrf2 induces KLF9, which represses antioxidant genes to raise ROS and drive cell death.","evidence":"ChIP, expression profiling, KLF9 knockout/knockdown, and in vivo bleomycin fibrosis model","pmids":["24613345"],"confidence":"High","gaps":["Threshold sensing mechanism not molecularly defined","Full antioxidant target set incomplete"]},{"year":2014,"claim":"Identified tumor-suppressive arms of KLF9 — direct p53 activation/stabilization and genome-wide repression of stemness via ITGA6.","evidence":"ChIP, reporter, cycloheximide chase, xenografts (HCC); ChIP-seq and ITGA6 rescue (glioblastoma)","pmids":["25242357","25288800"],"confidence":"Medium","gaps":["Mechanism of p53 protein stabilization unresolved","Context dependence of tumor suppression versus promotion unexplained"]},{"year":2017,"claim":"Connected KLF9 activity to post-translational control, showing JNK3 binding and Ser106/Ser110 phosphorylation gate its axon-growth suppression.","evidence":"Co-IP, phospho-site mutagenesis, in vitro neurite assay, and in vivo optic nerve regeneration","pmids":["28871032"],"confidence":"High","gaps":["Effect of phosphorylation on DNA binding versus cofactor recruitment not defined"]},{"year":2018,"claim":"Extended the stress-amplifier model to the ER, showing XBP1s induces KLF9, which raises ER calcium release to worsen ER stress and death.","evidence":"ChIP, luciferase, and Klf9 knockout mouse liver tunicamycin model","pmids":["30282030"],"confidence":"High","gaps":["Crosstalk between ER-stress and ROS arms of KLF9 not integrated"]},{"year":2020,"claim":"Mapped the glucocorticoid-induction mechanism in detail and identified KLF9 as a GR feedforward regulator controlling metabolic and inflammatory programs.","evidence":"GR ChIP-seq, GRO-seq eRNA, chromatin looping, GRE mutagenesis; zebrafish GR/klf9 CRISPR epistasis; PGC-1α direct activation in fat with transgenic/mutant mice","pmids":["33184061","32651405","32994275"],"confidence":"High","gaps":["Tissue-specific enhancer usage not fully cataloged","How one factor selects activating versus repressing targets unresolved"]},{"year":2024,"claim":"Established KLF9 as a regulator of cardiac mitochondrial homeostasis through PGC-1α and Mfn2, with Mfn2 sufficient to rescue the knockout phenotype.","evidence":"Cardiac-specific Klf9 KO/transgenic mice, mitochondrial assays, and AAV-Mfn2 rescue","pmids":["39528719"],"confidence":"High","gaps":["Direct versus indirect control of Mfn2 not fully distinguished","Relation to oxidative-stress arm in heart unclear"]},{"year":2025,"claim":"Added a post-transcriptional input, showing NAT10-mediated ac4C modification of KLF9 mRNA stabilizes it to promote adipogenesis.","evidence":"acRIP-seq/PCR, luciferase, NAT10 KD/OE in cells and in vivo Remodelin treatment","pmids":["40123006"],"confidence":"High","gaps":["Whether ac4C is regulated by upstream stress/hormone signals unknown"]},{"year":null,"claim":"How KLF9 selects between transcriptional activation and repression at a given locus, and how its many tissue-specific target programs are coordinated by upstream signals and post-translational/post-transcriptional modifications, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified cofactor logic for activator/repressor switching","Integration of ROS, ER-stress, metabolic, and tumor-suppressive arms into one regulatory map is incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,4,5,6,7,8,9,13,20,37]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,7,9,19]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,3,7]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,7,9,13,20,37]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,10,19,26]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[13,24,30,37]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,6,25]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,12,16,38]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[11,22,27]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,14,29,31]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,15,20]}],"complexes":[],"partners":["CEBPA","MAPK10","PGR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13886","full_name":"Krueppel-like factor 9","aliases":["Basic transcription element-binding protein 1","BTE-binding protein 1","GC-box-binding protein 1","Transcription factor BTEB1"],"length_aa":244,"mass_kda":27.2,"function":"Transcription factor that binds to GC box promoter elements. Selectively activates mRNA synthesis from genes containing tandem repeats of GC boxes but represses genes with a single GC box. 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threshold; KLF9 in turn binds to promoters of ROS-metabolism genes and suppresses thioredoxin reductase 2 expression, creating a feedforward loop that amplifies oxidative stress and promotes cell death. KLF9 deficiency was required for pathogenesis of bleomycin-induced pulmonary fibrosis in mice.\",\n      \"method\": \"Promoter binding (ChIP), gene expression profiling, KLF9 knockout/knockdown in cultured cells and mouse tissues, in vivo bleomycin model\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (ChIP, KO mouse, cell knockdown, in vivo disease model), replicated across cell types and in vivo\",\n      \"pmids\": [\"24613345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KLF9 binds directly to two GC-box sites in the PPARγ2 proximal promoter (identified by promoter deletion/mutation analysis) and synergistically activates PPARγ2 transcription through direct protein-protein interaction with C/EBPα. PPARγ2 overexpression rescues impaired adipogenesis caused by KLF9 knockdown, placing KLF9 upstream of PPARγ2 in the adipogenic cascade.\",\n      \"method\": \"Promoter deletion/mutation analysis, Co-IP (KLF9–C/EBPα interaction), RNAi knockdown, overexpression rescue\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — promoter mutagenesis combined with Co-IP and epistasis rescue, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"20725087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KLF9 interacts physically with MAPK10/JNK3 kinase; JNK3 is critical for KLF9's axon-growth-suppressive activity. Interfering with the JNK3-binding domain of KLF9, or mutating phosphorylation acceptor sites Ser106 and Ser110, abolishes KLF9-mediated neurite growth suppression in vitro and promotes optic nerve regeneration in vivo.\",\n      \"method\": \"Co-IP (KLF9–JNK3 interaction), site-directed mutagenesis (Ser106/Ser110), shRNA knockdown in vivo (optic nerve crush rat model), in vitro neurite outgrowth assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — binding partner identified by Co-IP, functional mutagenesis of phospho-sites, in vitro and in vivo confirmation\",\n      \"pmids\": [\"28871032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"KLF9/BTEB1 functionally interacts with PR-A and PR-B isoforms of the progesterone receptor in endometrial epithelial cells. Bteb1-null female mice show uterine hypoplasia, reduced implantation sites, and decreased expression of implantation genes Hoxa10 and cyclin D3, demonstrating that KLF9 is a functionally relevant PR co-regulator in uterine stroma.\",\n      \"method\": \"Bteb1 knockout mouse, uterine gene expression analysis, implantation phenotyping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with specific molecular and reproductive phenotypes, previously established in vitro PR interaction\",\n      \"pmids\": [\"15117941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"KLF9 is upregulated in multiple myeloma cells by bortezomib via HDAC inhibition (not ER stress). KLF9 binds the promoter of the pro-apoptotic gene NOXA, and KLF9 knockdown impairs NOXA upregulation and apoptosis induced by bortezomib or LBH589; KLF9 overexpression induces apoptosis in a partially NOXA-dependent manner.\",\n      \"method\": \"ChIP (KLF9 binding to NOXA promoter), gene expression profiling, siRNA knockdown, overexpression, HDAC inhibitor treatment\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirmation of promoter occupancy, loss-of-function/gain-of-function with defined apoptotic readout, mechanistic link to HDAC inhibition pathway\",\n      \"pmids\": [\"22144178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KLF9 functions as a genome-wide transcriptional repressor in glioblastoma stem-like cells; it represses integrin α6 (ITGA6), and this ITGA6 repression is required for KLF9's capacity to inhibit glioblastoma cell stemness and tumorigenicity.\",\n      \"method\": \"Genome-wide ChIP-seq mapping of KLF9 targets, ITGA6 rescue experiments, sphere formation and tumor assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide occupancy mapping plus epistasis rescue experiment, single lab with two orthogonal methods\",\n      \"pmids\": [\"25288800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KLF9 directly binds GC boxes within the proximal p53 promoter to activate p53 transcription, and also increases p53 protein stability (demonstrated by cycloheximide chase), thereby suppressing hepatocellular carcinoma growth in vitro and in vivo.\",\n      \"method\": \"Promoter binding (ChIP, reporter assay), cycloheximide chase (protein stability), xenograft tumor model\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay for direct promoter binding plus protein stability experiment, single lab\",\n      \"pmids\": [\"25242357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"BTEB1/KLF9 binds GC-rich sequences in the Xenopus TRβA gene proximal promoter in vitro and associates with the TRβA promoter in vivo in a T3- and developmental stage-dependent manner (ChIP). Induced BTEB1 expression accelerates and enhances TRβA autoinduction; this enhancement is lost with N-terminal truncation but not with zinc-finger DNA-binding mutations, indicating that BTEB1 can act through protein-protein interactions rather than direct DNA binding in this context.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA), ChIP, BTEB1 overexpression in XTC-2 cells, N-terminal truncation and zinc-finger point mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro binding + in vivo ChIP + mutagenesis distinguishing DNA-binding vs. protein-protein interaction mechanism\",\n      \"pmids\": [\"18045867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"BTEB1/KLF9 acts as both a transcriptional activator and repressor of the FGFR1 promoter through the same Sp1-like binding element at -59 bp during myogenesis: it activates FGFR1 in proliferating myoblasts and represses it in differentiating myotubes. BTEB1 protein is nuclear-localized in both cell types.\",\n      \"method\": \"Reporter assay (FGFR1 promoter deletion/mutation), nuclear localization (immunofluorescence), overexpression in myoblasts and myotubes\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter assay with element mapping, direct localization experiment, single lab\",\n      \"pmids\": [\"20554758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"BTEB-1/KLF9 binds to an autoregulatory element (A32) in the AP-2α gene promoter in a mutually exclusive manner with AP-2 and AP-2rep, and acts as a strong transcriptional activator of the AP-2α promoter in transfection assays.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA), expression library screening, transient transfection reporter assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus functional reporter assay, single lab, two complementary methods\",\n      \"pmids\": [\"9858544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"XBP1s (activated by high-level ER stress) binds to an evolutionarily conserved lower-affinity site in the KLF9 promoter to activate KLF9 transcription; KLF9 in turn induces TMEM38B and ITPR1 (regulators of ER calcium storage), promoting calcium release from the ER and exacerbating ER stress and cell death. Klf9 deficiency attenuates tunicamycin-induced ER stress in mouse liver.\",\n      \"method\": \"Promoter binding (ChIP for XBP1s at KLF9 promoter), luciferase reporter assay, KLF9 knockout mouse (liver ER stress model), gene expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus reporter plus KO mouse with mechanistic validation of downstream targets, multiple orthogonal methods\",\n      \"pmids\": [\"30282030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KLF9 recruits to the ISG15 promoter (ChIP) and represses ISG15 expression; loss of KLF9 in Apc(Min/+) mice increases colon adenoma burden associated with upregulation of interferon-induced genes including ISG15, and ISG15 suppresses apoptosis in colorectal cancer cells.\",\n      \"method\": \"Genetic epistasis (Apc(Min/+)/Klf9 genotype comparison), ChIP (KLF9 at ISG15 promoter), siRNA knockdown in HT29 cells, microarray\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis plus ChIP plus cell-line KD, multiple orthogonal methods\",\n      \"pmids\": [\"26210742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KLF9 is directly regulated by thyroid hormone receptor (TR) in a TR-dependent manner in vivo and in vitro. Klf9 knockdown in zebrafish impairs hematopoietic development including erythroid maturation and T lymphopoiesis, placing KLF9 downstream of the TR-KLF9 axis in hematopoiesis.\",\n      \"method\": \"T3 treatment with TR knockdown, in vivo zebrafish klf9 morpholino knockdown, transcriptome sequencing of thymus\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — TR-dependence shown in vivo and in vitro, zebrafish epistasis with specific hematopoietic phenotype\",\n      \"pmids\": [\"28972010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"KLF9 directly binds the Pgc1α gene promoter to stimulate its expression, promoting thermogenesis in brown and beige fat. Fat-specific Klf9 transgenic mice show increased thermogenesis and resistance to diet-induced obesity; Klf9-mutant mice show impaired thermogenic gene expression, reduced respiration, obesity, and cold sensitivity.\",\n      \"method\": \"ChIP (KLF9 binding to Pgc1α promoter), fat-specific Klf9 transgenic and mutant mice, metabolic phenotyping, Ucp1-dependent thermogenesis assay\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus transgenic/KO mouse models with defined metabolic phenotypes, multiple orthogonal methods\",\n      \"pmids\": [\"32994275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KLF9 directly inhibits MMP28 transcription by binding to its promoter (shown by ChIP-seq/ENCODE data and dual-luciferase assay), and forced MMP28 re-expression rescues the invasion/metastasis suppression caused by KLF9 overexpression in gastric cancer cells in vivo.\",\n      \"method\": \"ChIP-seq (ENCODE), dual-luciferase promoter assay, MMP28 rescue in vivo\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter occupancy from existing ChIP-seq validated by luciferase assay, in vivo rescue, single lab\",\n      \"pmids\": [\"30913394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BRAFV600E signaling transcriptionally upregulates KLF9; KLF9-dependent ROS are required for full-scale ERK1/2 activation and cell proliferation downstream of BRAFV600E in premalignant melanocytes. PTEN loss renders ERK1/2 activation insensitive to KLF9 and ROS.\",\n      \"method\": \"Klf9 knockout crossed with BrafCA and BrafCA/Pten-/- mouse models, N-acetylcysteine antioxidant treatment phenocopy, ERK1/2 phosphorylation analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis with two conditional mouse models, chemical phenocopy, defined molecular readout\",\n      \"pmids\": [\"30664687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"KLF9 binds the KLF-binding element at position -874 of the mouse C/EBPβ promoter (ChIP), enhances C/EBPβ expression, and drives early-phase adipogenesis in 3T3-L1 cells; siRNA knockdown of KLF9 reduces C/EBPβ expression and lipid accumulation.\",\n      \"method\": \"ChIP (KLF9 at C/EBPβ promoter), siRNA knockdown, Oil Red O staining\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus loss-of-function with specific molecular readout, single lab\",\n      \"pmids\": [\"24220850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KLF9 loss in mice and human endometrial stromal cells enhances BMP2 expression, while recombinant BMP2 attenuates KLF9 mRNA; KLF13 knockdown abrogates BMP2-mediated inhibition of KLF9, revealing cross-regulation among BMP2, KLF9, and KLF13 in progesterone-sensitive uterine stromal differentiation.\",\n      \"method\": \"Klf9 null mice, KLF9 siRNA in human endometrial stromal cells (HESCs), BMP2 treatment, KLF13 siRNA epistasis\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological epistasis in two systems (mouse and human cells), single lab\",\n      \"pmids\": [\"20410205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In HepG2 liver cells and mouse and human primary hepatocytes, T3 induces KLF9 in a thyroid hormone receptor (TR)-dependent manner; KLF9 then regulates hundreds of target genes and cooperates with T3/TR to regulate Notch signaling pathway genes, including in human ESC and iPSC hepatocyte differentiation contexts.\",\n      \"method\": \"KLF9 knockdown (siRNA), microarray gene expression profiling, T3 + KD epistasis in HepG2 and primary hepatocytes and stem cells\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis knockdown in multiple cell types with transcriptomic validation, single lab\",\n      \"pmids\": [\"25330987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KLF9 directly binds to repressive KLF9 binding elements (RKBE; 5′-CA/GCCC-3′) in the Prdx6 promoter to repress Prdx6 transcription; high-dose SFN-induced Nrf2 activates KLF9 through an ARE in the KLF9 promoter, and KLF9 then suppresses PRDX6, increasing ROS and cell death. KLF9 depletion reverses this.\",\n      \"method\": \"Promoter binding analysis (RKBE elements), KLF9 knockdown (shRNA), gene expression analysis, ROS measurement\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter element analysis and KD with ROS/viability readouts, single lab\",\n      \"pmids\": [\"31569690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Glucocorticoid receptor (GR) binds to four glucocorticoid response element (GRE)-containing sites near the KLF9 locus (two proximal, two distal) upon glucocorticoid treatment; these GBSs produce enhancer RNAs (eRNAs) and loop to the KLF9 TSS. CBP/p300 silencing reduces proximal GBS activity but not KLF9 expression, indicating GRE-dependent distal enhancers drive glucocorticoid induction of KLF9.\",\n      \"method\": \"ChIP-seq (GR binding), GRO-seq (eRNA), chromatin looping (3C-related), luciferase reporter with GRE mutations, CBP/p300 siRNA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple ChIP-seq + GRO-seq + looping + mutagenesis in cell lines and primary HBE cells, mechanistically comprehensive\",\n      \"pmids\": [\"33184061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In zebrafish larvae, klf9 is a key glucocorticoid receptor (GR)-dependent feedforward transcriptional regulator: klf9 is underexpressed in GR-mutant larvae and strongly induced by cortisol; Klf9 loss-of-function (CRISPR) reveals that Klf9 mediates upregulation of pro-inflammatory genes in response to chronic cortisol exposure.\",\n      \"method\": \"CRISPR-Cas9 GR and klf9 mutants, RNA-seq transcriptomics, cortisol treatment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR double mutant epistasis with RNA-seq, single lab, zebrafish model\",\n      \"pmids\": [\"32651405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KLF9 directly binds to the TLR2 promoter in macrophages (ChIP), enhancing TLR2 expression and subsequently activating NF-κB and MAPK inflammatory signaling after myocardial infarction; KLF9 deficiency prevents adverse cardiac remodeling and suppresses inflammatory responses in this context.\",\n      \"method\": \"ChIP (KLF9 at TLR2 promoter), KLF9 knockdown in macrophages, myocardial infarction mouse model, NF-κB/MAPK signaling analysis\",\n      \"journal\": \"The Korean journal of physiology & pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus KD with defined signaling readout and in vivo model, single lab\",\n      \"pmids\": [\"36815257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF9 promotes intestinal Asbt (apical sodium-dependent bile acid transporter) expression by binding to the Asbt promoter; intestine-specific Klf9 deletion reduces bile acid reabsorption, while intestinal Klf9 overexpression increases serum bile acid levels and reduces fecal bile acids. Reabsorbed bile acid regulates hepatic FGF15 and bile acid synthetic enzymes.\",\n      \"method\": \"Systemic and intestine-specific Klf9 KO mice, Klf9 intestinal transgenic mice, promoter binding assay, bile acid quantification\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO and transgenic mouse models with molecular promoter binding, single lab\",\n      \"pmids\": [\"35105957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KLF9 controls cardiac mitochondrial homeostasis: cardiac-specific Klf9 KO causes hypertrophic cardiomyopathy with mitochondrial fragmentation and impaired respiration; KLF9 regulates PGC-1α and its target genes (energy metabolism) and controls Mfn2 expression to regulate mitochondrial dynamics and mitophagy. AAV-mediated Mfn2 rescue in Klf9-CKO hearts restores cardiac function.\",\n      \"method\": \"Cardiac-specific Klf9 KO and transgenic mice, angiotensin II model, mitochondrial function assays, AAV-Mfn2 rescue\",\n      \"journal\": \"Nature cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cardiac-specific KO and transgenic plus AAV rescue of downstream target, multiple mechanistic readouts, single rigorous study\",\n      \"pmids\": [\"39528719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KLF9 directly binds the KLF9 promoter in the KLF9/CYP1A1 axis; PM2.5 stimulates KLF9 expression, and KLF9 binds the CYP1A1 promoter to drive CYP1A1 expression, activating oxidative stress and mitochondrial apoptosis pathways in trophoblasts.\",\n      \"method\": \"RNA-seq, ChIP (KLF9 at CYP1A1 promoter), KLF9 knockdown in HTR8/SVneo cells\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus loss-of-function with transcriptomic confirmation, single lab\",\n      \"pmids\": [\"37737576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KLF9 represses PRDX6 expression in neuronal cells under hyperglycemic and bupivacaine conditions; KLF9 deficiency (shRNA) increases PRDX6, reduces ROS and mitochondrial dysfunction; PRDX6 knockdown abolishes the protective effect of KLF9 deficiency, placing PRDX6 downstream of KLF9-mediated oxidative stress.\",\n      \"method\": \"shRNA KLF9 knockdown, siRNA-Prdx6, ROS measurement, mitochondrial membrane potential assay, Western blot\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function epistasis with specific mechanistic readout, single lab\",\n      \"pmids\": [\"33547545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF9 directly binds the GSDMD promoter (luciferase reporter and ChIP) and activates GSDMD transcription; KLF9 knockout reduces GSDMD expression and attenuates LPS-induced inflammatory cytokine release and lung injury in mice.\",\n      \"method\": \"Luciferase reporter assay, ChIP, KLF9 KO mice, LPS-induced ALI model, ELISA for cytokines\",\n      \"journal\": \"Autoimmunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter plus KO mouse model, single lab\",\n      \"pmids\": [\"35993279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF9 directly binds the GRK5 promoter (ChIP) to activate GRK5 transcription; GRK5 then phosphorylates HDAC6, promoting chondrocyte ECM degradation and apoptosis in osteoarthritis. GRK5 knockdown eliminates the effects of KLF9 overexpression; HDAC6 inhibition abolishes effects of GRK5 overexpression.\",\n      \"method\": \"ChIP (KLF9 at GRK5 promoter), KLF9 KD/OE in chondrocytes, GRK5 epistasis KD, HDAC6 inhibitor (TubastatinA), OA rat model\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus multi-step epistasis, single lab\",\n      \"pmids\": [\"39779910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KLF9 directly binds promoter regions of mesenchymal genes in hepatocellular carcinoma cells (ChIP), repressing their expression and reversing the EMT program; KLF9 is itself directly suppressed by the mesenchymal transcription factor Slug, creating a negative feedback loop between KLF9 and EMT.\",\n      \"method\": \"ChIP (KLF9 at mesenchymal gene promoters), KLF9 OE/KD with migration/metastasis assays, Slug-KLF9 promoter repression\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional KO/OE with in vivo metastasis model, single lab\",\n      \"pmids\": [\"37400979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KLF9 overexpression in hepatocytes induces CD36 expression, increasing fatty acid uptake and triglyceride accumulation; liver-specific Klf9 knockout reduces CD36 expression and alleviates fatty liver in high-fat diet-fed mice, placing KLF9 upstream of CD36 in hepatic lipid metabolism.\",\n      \"method\": \"Adenovirus-mediated Klf9 OE/KD in primary hepatocytes, liver-specific Klf9 KO mice, CD36 mRNA/protein analysis, Oil Red O staining\",\n      \"journal\": \"Sheng li xue bao / Acta physiologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO and adenoviral OE/KD with molecular and phenotypic readouts, single lab\",\n      \"pmids\": [\"34708234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF9 binds to the SDF-1 promoter (ChIP and dual-luciferase assay) to repress SDF-1 transcription, reducing SDF-1/CXCR4 signaling and suppressing renal cell carcinoma cell proliferation, invasion, and migration. Recombinant SDF-1 rescues the inhibitory effect of KLF9 overexpression.\",\n      \"method\": \"ChIP, dual-luciferase assay, KLF9 siRNA/pcDNA overexpression, SDF-1 protein rescue\",\n      \"journal\": \"The Kaohsiung journal of medical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase plus epistasis rescue, single lab\",\n      \"pmids\": [\"37010151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF9 binds the DDAH2 promoter and negatively regulates DDAH2 expression (luciferase reporter and ChIP); KLF9 silencing increases DDAH2 and reduces apoptosis, inflammation, and oxidative stress in high-glucose trophoblast cells; DDAH2 inhibition reverses these protective effects.\",\n      \"method\": \"Luciferase reporter assay, ChIP, KLF9 siRNA, DDAH2 siRNA epistasis, in vivo STZ-GDM mouse model\",\n      \"journal\": \"Bioengineered\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP + reporter + epistasis, single lab\",\n      \"pmids\": [\"34787071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NAT10-mediated N4-acetylcytidine (ac4C) modification of KLF9 mRNA enhances KLF9 mRNA stability and translation; NAT10 overexpression promotes adipogenesis via KLF9, and NAT10 inhibition (Remodelin) reduces adipose expansion in HFD mice by suppressing KLF9 ac4C modification. KLF9 subsequently activates the CEBPA/B-PPARG pathway.\",\n      \"method\": \"acRIP-seq, RNA-seq, acRIP-PCR (KLF9 mRNA as NAT10 target), dual-luciferase reporter (NAT10 motif binding), NAT10 KD/OE in hADSCs and 3T3-L1, AAV-shRNA-NAT10 in vivo, Remodelin treatment\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ac4C modification mapped by acRIP-seq, validated by acRIP-PCR and luciferase, multiple in vitro and in vivo systems, novel post-transcriptional mechanism\",\n      \"pmids\": [\"40123006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In triple negative breast cancer cells, disruption of SIN3A-PF1 interaction increases KLF9 occupancy at ITGA6 and ITGB1 promoters (ChIP); KLF9 represses ITGA6 and ITGB1 expression, and KLF9 knockdown re-expresses both integrins and restores the invasive phenotype, functionally linking KLF9 to SIN3A complex-mediated repression of invasion.\",\n      \"method\": \"ChIP (KLF9 at ITGA6/ITGB1 promoters), KLF9 siRNA rescue experiment, RNA-seq\",\n      \"journal\": \"Translational oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus rescue KD with invasion phenotype, single lab\",\n      \"pmids\": [\"34968869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF9 binds directly to the KLF9 promoter (transcription factor-promoter interaction) and activates TRIM33 transcription (ChIP and dual-luciferase assay); TRIM33 overexpression suppresses TNF-α-induced proliferation, invasion and inflammation in synovial fibroblasts, and KLF9 downregulation reverses TRIM33-mediated suppression.\",\n      \"method\": \"ChIP, dual-luciferase reporter, KLF9 and TRIM33 siRNA, TNF-α-induced MH7A cell model\",\n      \"journal\": \"Immunity, inflammation and disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter plus epistasis, single lab\",\n      \"pmids\": [\"36301038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KLF9 binds to the miR-494-3p promoter and increases miR-494-3p expression (ChIP and dual-luciferase); KLF9 also binds the RGS2 promoter to promote RGS2 expression. In COPD context, KLF9-driven miR-494-3p negatively regulates PTEN, facilitating NLRP3 inflammasome activation and inflammation.\",\n      \"method\": \"ChIP (KLF9 at miR-494-3p and/or PTEN/RGS2 promoters), dual-luciferase reporter, COPD cell and mouse models\",\n      \"journal\": \"Immunity, inflammation and disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter, single lab, mechanistic pathway established\",\n      \"pmids\": [\"37904708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In cardiomyocytes, Klf9 is a direct early target of glucocorticoid receptor (GR) activation; Klf9 ChIP-seq identified 2150 Klf9-bound genes after dexamethasone treatment. Klf9 knockdown reverses GR-induced changes in 1640 genes enriched in metabolic pathways; Klf9 KD inhibits Dex-induced increases in glycolytic function and mitochondrial spare respiratory capacity.\",\n      \"method\": \"Klf9 ChIP-seq (in Dex-treated cardiomyocytes), RNA-seq with Klf9 siRNA, glycolysis stress test, mitochondrial stress test\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP-seq plus transcriptomics plus functional metabolic assays in cardiomyocytes, multiple orthogonal methods\",\n      \"pmids\": [\"37690661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Klf9 is necessary and sufficient for Purkinje cell survival in organotypic culture in the absence of trophic factors: Klf9 overexpression increases survival from 40% to 88%; Klf9 knockdown reduces survival to 14%; Klf9 KO reduces survival by half. The absence of Klf9 can be rescued by IGF-1 and NT3 trophic factors.\",\n      \"method\": \"Lentiviral Klf9 OE/KD in organotypic cerebellar cultures, Klf9 KO mice, trophic factor rescue (IGF-1, NT3)\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — OE, KD, and KO with trophic factor epistasis, multiple genetic manipulations yielding consistent survival phenotype\",\n      \"pmids\": [\"23201237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"miR-26a targets KLF9 in neuronal cells; KLF9 suppresses TRAF2 and KLF2 expression, facilitating neuronal damage. ASC-derived extracellular vesicle-delivered miR-26a inhibits KLF9, relieving this suppression and reducing neuronal damage in cerebral ischemia/reperfusion models in vitro and in vivo.\",\n      \"method\": \"miR-26a target validation (luciferase), miR-26a/KLF9 gain- and loss-of-function in OGD/RP cell model and mouse ischemia model, Western blot for TRAF2/KLF2\",\n      \"journal\": \"Adipocyte\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — miRNA target validation plus in vitro and in vivo epistasis, single lab\",\n      \"pmids\": [\"34311651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KLF9 activates lncRNA UCA1 transcription by directly binding its promoter; UCA1 recruits EZH2 to the p27 promoter region, increasing H3K27me3 enrichment and epigenetically suppressing p27 expression, thereby exacerbating cardiomyocyte hypertrophy in HOCM. UCA1 overexpression or p27 downregulation reverses the protective effect of KLF9 knockdown.\",\n      \"method\": \"ChIP (KLF9 at UCA1 promoter; EZH2/H3K27me3 at p27 promoter), UCA1/p27 rescue experiments, ISO-induced cardiomyocyte hypertrophy model\",\n      \"journal\": \"International journal of experimental pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP at two levels of pathway plus epistasis rescue, single lab\",\n      \"pmids\": [\"39909852\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KLF9 (also known as BTEB1) is a Krüppel-like zinc-finger transcription factor that functions as both a transcriptional activator and repressor by binding GC-rich promoter elements; it is induced by thyroid hormone (via TR), glucocorticoids (via GR with multiple GRE-containing enhancers), Nrf2, XBP1s (under high ER stress), BRAFV600E, and ATF4, and in turn directly regulates downstream targets including PPARγ2 (adipogenesis), PGC-1α (thermogenesis/mitochondrial biogenesis), Mfn2 (mitochondrial dynamics), thioredoxin reductase 2 and PRDX6 (ROS clearance), NOXA (apoptosis), ISG15 (immune/apoptosis), MMP28, GSDMD, TLR2, SDF-1, ITGA6/ITGB1, and CD36 (lipid uptake); its activity is modulated by JNK3-mediated phosphorylation at Ser106/Ser110 (suppressing axon growth), by protein-protein interaction with C/EBPα and progesterone receptor, and at the post-transcriptional level by NAT10-mediated ac4C modification of its mRNA; collectively, KLF9 acts as a central feedforward amplifier of oxidative stress, a regulator of mitochondrial and metabolic homeostasis, a modulator of cell differentiation (adipogenesis, oligodendrocyte, neuronal, hematopoietic), and a context-dependent tumor suppressor.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KLF9 (BTEB1) is a Krüppel-like zinc-finger transcription factor that binds GC-rich promoter elements and acts as both an activator and a repressor depending on cellular context, functioning as a hub that couples hormonal and stress signals to oxidative-stress, metabolic, differentiation, and tumor-suppressive programs [#7, #8, #0]. It is a direct, hormone-dependent target of multiple upstream signals: thyroid hormone receptor [#7, #12], glucocorticoid receptor through GRE-containing distal enhancers that loop to the KLF9 TSS [#20, #21, #37], the oxidative-stress sensor Nrf2 [#0, #19], XBP1s under high ER stress [#10], and BRAFV600E signaling [#15], and its mRNA is stabilized post-transcriptionally by NAT10-mediated ac4C modification [#33]. A recurring theme is a feedforward amplification of oxidative stress: induced by Nrf2 above a ROS threshold, KLF9 represses antioxidant genes including thioredoxin reductase 2 and PRDX6, thereby raising ROS and promoting cell death [#0, #19, #26]. KLF9 controls mitochondrial and metabolic homeostasis by directly activating PGC-1α and regulating Mfn2 to govern mitochondrial dynamics, energy metabolism, and thermogenesis in cardiac and adipose tissue [#13, #24], and it drives adipogenic and hepatic lipid programs through PPARγ2/C/EBP induction and CD36 [#1, #16, #30]. As a context-dependent tumor suppressor it activates p53 and pro-apoptotic NOXA while repressing pro-invasive and stemness targets such as ITGA6/ITGB1, MMP28, SDF-1, ISG15, and mesenchymal/EMT genes [#6, #4, #5, #34, #14, #31, #11, #29]. KLF9 also shapes differentiation and survival in neuronal, hematopoietic, and uterine systems—supporting Purkinje cell survival [#38], promoting hematopoietic maturation downstream of TR [#12], and acting as a progesterone-receptor co-regulator required for uterine implantation [#3]. Its activity is further tuned by direct protein-protein interactions, including synergy with C/EBPα [#1] and JNK3 binding with phosphorylation at Ser106/Ser110 that drives axon-growth suppression [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that BTEB1/KLF9 is a sequence-specific transcriptional activator, defining its core activity before its physiological roles were known.\",\n      \"evidence\": \"EMSA and reporter assays showing binding to the AP-2α autoregulatory element\",\n      \"pmids\": [\"9858544\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vivo target validation\", \"Mechanism of activation versus repression not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated that KLF9 is a physiologically required progesterone-receptor co-regulator, linking the factor to reproductive/uterine biology in vivo.\",\n      \"evidence\": \"Bteb1-null mice with uterine hypoplasia and reduced implantation gene expression\",\n      \"pmids\": [\"15117941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct PR-KLF9 binding interface not mapped\", \"Downstream target promoters not defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed that KLF9 can act through protein-protein interaction rather than direct DNA binding in autoinduction of thyroid hormone receptor, refining how it enhances transcription.\",\n      \"evidence\": \"EMSA, ChIP, and N-terminal versus zinc-finger mutants in Xenopus XTC-2 cells\",\n      \"pmids\": [\"18045867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the bridging partner in protein-protein mode unknown\", \"Generalizability to mammalian promoters untested here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed KLF9 upstream in the adipogenic cascade and identified a direct C/EBPα cofactor interaction driving PPARγ2 induction.\",\n      \"evidence\": \"Promoter mutagenesis, Co-IP, and PPARγ2 overexpression rescue of knockdown\",\n      \"pmids\": [\"20725087\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of KLF9-C/EBPα interaction not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Revealed KLF9 as a context-switchable dual activator/repressor at a single element, explaining bidirectional control during differentiation.\",\n      \"evidence\": \"FGFR1 promoter reporter mapping and nuclear localization in myoblasts versus myotubes\",\n      \"pmids\": [\"20554758\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"What determines the activator-to-repressor switch (cofactors) unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the central feedforward oxidative-stress amplifier model: Nrf2 induces KLF9, which represses antioxidant genes to raise ROS and drive cell death.\",\n      \"evidence\": \"ChIP, expression profiling, KLF9 knockout/knockdown, and in vivo bleomycin fibrosis model\",\n      \"pmids\": [\"24613345\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Threshold sensing mechanism not molecularly defined\", \"Full antioxidant target set incomplete\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified tumor-suppressive arms of KLF9 — direct p53 activation/stabilization and genome-wide repression of stemness via ITGA6.\",\n      \"evidence\": \"ChIP, reporter, cycloheximide chase, xenografts (HCC); ChIP-seq and ITGA6 rescue (glioblastoma)\",\n      \"pmids\": [\"25242357\", \"25288800\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of p53 protein stabilization unresolved\", \"Context dependence of tumor suppression versus promotion unexplained\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected KLF9 activity to post-translational control, showing JNK3 binding and Ser106/Ser110 phosphorylation gate its axon-growth suppression.\",\n      \"evidence\": \"Co-IP, phospho-site mutagenesis, in vitro neurite assay, and in vivo optic nerve regeneration\",\n      \"pmids\": [\"28871032\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effect of phosphorylation on DNA binding versus cofactor recruitment not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extended the stress-amplifier model to the ER, showing XBP1s induces KLF9, which raises ER calcium release to worsen ER stress and death.\",\n      \"evidence\": \"ChIP, luciferase, and Klf9 knockout mouse liver tunicamycin model\",\n      \"pmids\": [\"30282030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crosstalk between ER-stress and ROS arms of KLF9 not integrated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Mapped the glucocorticoid-induction mechanism in detail and identified KLF9 as a GR feedforward regulator controlling metabolic and inflammatory programs.\",\n      \"evidence\": \"GR ChIP-seq, GRO-seq eRNA, chromatin looping, GRE mutagenesis; zebrafish GR/klf9 CRISPR epistasis; PGC-1α direct activation in fat with transgenic/mutant mice\",\n      \"pmids\": [\"33184061\", \"32651405\", \"32994275\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific enhancer usage not fully cataloged\", \"How one factor selects activating versus repressing targets unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established KLF9 as a regulator of cardiac mitochondrial homeostasis through PGC-1α and Mfn2, with Mfn2 sufficient to rescue the knockout phenotype.\",\n      \"evidence\": \"Cardiac-specific Klf9 KO/transgenic mice, mitochondrial assays, and AAV-Mfn2 rescue\",\n      \"pmids\": [\"39528719\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect control of Mfn2 not fully distinguished\", \"Relation to oxidative-stress arm in heart unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Added a post-transcriptional input, showing NAT10-mediated ac4C modification of KLF9 mRNA stabilizes it to promote adipogenesis.\",\n      \"evidence\": \"acRIP-seq/PCR, luciferase, NAT10 KD/OE in cells and in vivo Remodelin treatment\",\n      \"pmids\": [\"40123006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ac4C is regulated by upstream stress/hormone signals unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How KLF9 selects between transcriptional activation and repression at a given locus, and how its many tissue-specific target programs are coordinated by upstream signals and post-translational/post-transcriptional modifications, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified cofactor logic for activator/repressor switching\", \"Integration of ROS, ER-stress, metabolic, and tumor-suppressive arms into one regulatory map is incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 4, 5, 6, 7, 8, 9, 13, 20, 37]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 7, 9, 19]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 3, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 7, 9, 13, 20, 37]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 10, 19, 26]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [13, 24, 30, 37]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 6, 25]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 12, 16, 38]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [11, 22, 27]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 14, 29, 31]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 15, 20]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CEBPA\", \"MAPK10\", \"PGR\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}