{"gene":"KLF15","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2002,"finding":"KLF15 directly activates GLUT4 expression in adipose and muscle cell lines, requiring an intact KLF15-binding site proximal to the MEF2A site in the GLUT4 promoter; KLF15 physically interacts with MEF2A (co-immunoprecipitation) and synergistically activates the GLUT4 promoter with MEF2A; KLF15 overexpression increases both basal and insulin-stimulated glucose uptake in adipocytes.","method":"Co-transfection/reporter assays, promoter deletion and mutational analyses, co-immunoprecipitation, glucose uptake assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional assays, promoter mutagenesis, co-IP, and direct glucose uptake measurement in one rigorous study","pmids":["12097321"],"is_preprint":false},{"year":2004,"finding":"KLF15 transcriptionally activates the mitochondrial acetyl-CoA synthetase gene AceCS2 through the most proximal KLF-binding site in its promoter; KLF15 physically interacts with Sp1 (GST pull-down) and synergistically activates the AceCS2 promoter with Sp1 through an adjacent GC-box.","method":"Luciferase reporter assays, promoter deletion/mutation analyses, GST pull-down, Drosophila SL2 cell transfection, quantitative RT-PCR","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro pull-down interaction plus multiple orthogonal promoter assays and mutagenesis in one study","pmids":["14960588"],"is_preprint":false},{"year":2005,"finding":"KLF15 plays an essential role in adipogenesis by transcriptionally upregulating PPARγ2; KLF15 and C/EBPα synergistically activate the PPARγ2 promoter; dominant-negative KLF15 or RNAi reduces PPARγ expression and blocks adipogenesis without affecting C/EBPβ induction; C/EBPα, C/EBPβ, and C/EBPδ can induce KLF15 expression.","method":"Dominant-negative overexpression, RNA interference, ectopic overexpression in NIH 3T3/C2C12 cells, luciferase reporter assay, microarray","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function (two independent methods: DN and RNAi) plus gain-of-function plus promoter assays with defined epistasis","pmids":["15664998"],"is_preprint":false},{"year":2005,"finding":"KLF15 zinc-finger domains bind a 9 bp consensus sequence (core CG/TCCCC) in a zinc-dependent, sequence-specific manner; KLF15 binds multiple sites in the rhodopsin and IRBP promoters including the CRS-1 and G-rich repressor elements, and represses promoter activation by CRX and/or NRL.","method":"EMSA, DNaseI footprinting with KLF15-GST fusion protein, luciferase reporter assay","journal":"BMC molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical binding assays (EMSA + footprinting) plus functional reporter assays in one study","pmids":["15963234"],"is_preprint":false},{"year":2008,"finding":"KLF15 inhibits CTGF expression in cardiac fibroblasts by blocking recruitment of the co-activator P/CAF to the CTGF promoter without affecting Smad3-DNA binding; KLF15 overexpression suppresses basal and TGFβ1-induced CTGF promoter activity; KLF15-/- mice subjected to aortic banding show increased CTGF and fibrosis.","method":"Adenoviral overexpression, luciferase reporter assay, ChIP, EMSA, aortic banding mouse model","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus EMSA plus in vivo KO model with defined molecular mechanism (P/CAF recruitment)","pmids":["18586263"],"is_preprint":false},{"year":2009,"finding":"KLF15 directly binds the HSD17B5 (17β-HSD5) promoter and transcriptionally activates it, increasing testosterone formation; a KLF15 binding site was identified by luciferase reporter constructs, EMSA, and ChIP; insulin increases KLF15 mRNA and HSD17B5 promoter activity.","method":"Luciferase reporter assay, EMSA, chromatin immunoprecipitation (ChIP), RT-PCR","journal":"The Journal of clinical endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 / Moderate — three orthogonal methods (EMSA, ChIP, reporter assay) in one study establishing direct promoter binding","pmids":["19366843"],"is_preprint":false},{"year":2009,"finding":"miR-133 targets the 3'UTR of KLF15 and reduces its protein level, thereby decreasing GLUT4 expression and insulin-mediated glucose uptake in cardiomyocytes.","method":"Forced expression of miR-133, lenti-decoy reporter, western blot, glucose uptake assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, functional miRNA-target relationship demonstrated but direct 3'UTR luciferase validation only implied, not explicitly stated","pmids":["19720047"],"is_preprint":false},{"year":2010,"finding":"KLF15 regulates hepatic gluconeogenesis by coordinating expression of gluconeogenic and amino acid-degrading enzyme genes with the coactivator PGC-1α; liver-specific KLF15 ablation in diabetic mice reduces gluconeogenic gene expression and ameliorates hyperglycemia; metformin reduces KLF15 abundance by accelerating its degradation and reducing its mRNA, and its suppression of gluconeogenesis is attenuated by restoration of KLF15.","method":"Liver-specific KO mice, adenoviral KLF15 restoration, cultured hepatocytes, glucose production assay, gene expression analysis","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — liver-specific genetic ablation plus rescue experiments with defined phenotypic and molecular readouts","pmids":["20393151"],"is_preprint":false},{"year":2010,"finding":"KLF15 directly activates transcription of the UCP1 promoter through GT-box elements in brown adipocytes; KLF15 and KLF11 both interact directly with the UCP1 promoter.","method":"Promoter reporter assay, co-transfection in mesenchymal stem cell line, promoter binding analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional reporter assay showing direct promoter interaction, single lab, limited mechanistic follow-up","pmids":["20709022"],"is_preprint":false},{"year":2010,"finding":"KLF15 and Sp1 cooperatively activate the human LRP5 promoter through adjacent binding sites in the -72 to -53 bp region; ChIP confirms KLF15 and Sp1 binding to this region in cells; Drosophila SL2 cell transactivation is dependent on intact Sp1 and KLF15 binding motifs.","method":"Luciferase reporter assay, ChIP, Drosophila SL2 cell transfection, mutational analysis","journal":"BMC genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter/mutagenesis, single lab","pmids":["20141633"],"is_preprint":false},{"year":2012,"finding":"KLF15 is required for podocyte differentiation; KLF15 binds to promoter regions of nephrin and podocin (ChIP); KLF15-/- mice show increased susceptibility to podocyte injury; overexpression of KLF15 stimulates expression of differentiation markers.","method":"ChIP, KLF15-/- mice with LPS/adriamycin challenge, adenoviral overexpression, reporter assay, microarray","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct promoter binding plus in vivo KO phenotype with multiple readouts","pmids":["22493483"],"is_preprint":false},{"year":2012,"finding":"KLF15 inhibits estrogen-induced uterine epithelial cell proliferation by binding the Mcm2 promoter under progesterone regulation, recruiting HDAC1/3, increasing H3 methylation and decreasing H3 acetylation, and inhibiting RNA polymerase II binding; KLF15 ectopic expression in an estrogenized uterus mimics progesterone's inhibition of MCM2 and DNA synthesis.","method":"ChIP, transient transfection, in vivo uterine injection, cell proliferation assay, histone modification analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating promoter binding and histone modification changes, plus in vivo functional confirmation","pmids":["22538816"],"is_preprint":false},{"year":2012,"finding":"KLF15 interacts with and strongly represses the transcriptional activity of myocardin-related transcription factors MRTF-A and MRTF-B; the nuclear localization signal of KLF15 was mapped to a region within its C-terminal zinc fingers; cardiac overexpression of KLF15 via rAAV prevents angiotensin II-induced cardiac hypertrophy.","method":"Co-immunoprecipitation/interaction assay, reporter assay, rAAV cardiac overexpression, mouse model of angiotensin II-induced hypertrophy","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional interaction assay plus in vivo rescue, single lab","pmids":["22586493"],"is_preprint":false},{"year":2012,"finding":"KLF15 deficiency disrupts circadian amino acid rhythms and impairs rhythmic ammonia-to-urea detoxification; Klf15 transcriptionally coordinates rhythmic expression of multiple enzymes involved in nitrogen homeostasis; feeding plays a dominant role in modulating KLF15 rhythm.","method":"Klf15-/- mice, metabolic profiling, circadian rhythm analysis, feeding manipulation","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with defined biochemical phenotype (amino acid/urea rhythm) and mechanistic pathway placement","pmids":["22405069"],"is_preprint":false},{"year":2013,"finding":"KLF15 is an essential mediator of ER stress-induced insulin resistance in the liver; KLF15-/- mice are protected from hepatic insulin resistance under high-fat feeding; KLF15 deficiency is associated with decreased mTORC1 activity, increased AMPK phosphorylation, and activation of autophagy; KLF15 controls mTORC1-mediated insulin resistance via amino acid signaling in primary hepatocytes.","method":"KLF15-/- mice, high-fat diet, pharmacological ER stress induction, primary hepatocyte assays, mTORC1/AMPK signaling analysis","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with in vivo and in vitro phenotype across multiple signaling readouts","pmids":["24167585"],"is_preprint":false},{"year":2014,"finding":"KLF15 regulates slow myosin heavy chain (MHC-β/slow) expression in muscle by binding the NFATc1 promoter and inducing its activity, thereby mediating calcineurin/NFAT signaling; this was shown by gene silencing, overexpression, and luciferase reporter assay in C2C12 myotubes.","method":"Gene silencing (siRNA), overexpression, luciferase reporter assay, gene expression analysis in C2C12 myotubes","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter assay with knockdown and overexpression, single lab","pmids":["24680826"],"is_preprint":false},{"year":2015,"finding":"KLF15 is the first identified negative regulator of circadian ileal Fgf15 expression; using biochemical, molecular, and functional assays (including ileectomy and bile duct catheterization), liver-specific KLF15-KO studies showed a non-hepatic basis for bile acid regulation, and KLF15 controls circadian bile acid production through regulation of Fgf15.","method":"Systemic and liver-specific Klf15-KO mice, bile acid/lipid absorption measurement, ileectomy, bile duct catheterization, molecular assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models plus invasive functional assays (ileectomy, catheterization), single lab but orthogonal approaches","pmids":["26040986"],"is_preprint":false},{"year":2015,"finding":"KLF15 governs biphasic transcriptomic oscillation in the heart corresponding to active (ATP production) and resting (remodeling/repair) phases; cardiomyocyte-specific depletion of KLF15 leads to disorganized oscillatory behavior without phasic partition despite an intact core clock, establishing KLF15 as a nodal connection between the circadian clock and cardiac rhythmicity.","method":"Cardiomyocyte-specific KLF15 depletion, transcriptome profiling, circadian rhythm analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO with genome-wide transcriptomic phenotype and defined biological process","pmids":["26686628"],"is_preprint":false},{"year":2016,"finding":"During fasting, KLF15 forms a complex with LXR/RXR specifically on the Srebf1 promoter, recruiting the corepressor RIP140 instead of the coactivator SRC1, thereby repressing SREBP-1c and downstream lipogenic enzyme expression; KLF15 overexpression specifically ameliorates hypertriglyceridemia.","method":"ChIP, promoter reporter assay, protein complex analysis (co-immunoprecipitation implied), mouse overexpression model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating complex formation on specific promoter with defined coregulator switch (RIP140 vs SRC1), plus in vivo phenotype","pmids":["27545894"],"is_preprint":false},{"year":2016,"finding":"KLF15 binds to the ACSL1 promoter region and drives its transcription in bovine adipocytes; this was confirmed by mutational analysis and EMSA; E2F1, Sp1, E2F4, and KLF15 all bind the ACSL1 promoter proximal region.","method":"Luciferase reporter assay, EMSA, ChIP (implied), mutational analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and reporter assays with mutagenesis, single lab","pmids":["26782942"],"is_preprint":false},{"year":2017,"finding":"Per3 and BMAL1 directly regulate Klf15 expression in adipocyte precursor cells; deletion of Per3 promotes adipogenesis in vivo through this clock output pathway acting via KLF15.","method":"Per3 deletion mice, in vivo adipogenesis analysis, chromatin analysis of BMAL1/Per3 binding at Klf15 promoter","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO model with molecular binding evidence for BMAL1/Per3 regulation of Klf15, single lab","pmids":["29186676"],"is_preprint":false},{"year":2017,"finding":"c-Jun directly binds near glucocorticoid response element (GRE) sites in the KLF15 promoter and inhibits glucocorticoid receptor (GR)-induced KLF15 promoter activity, thereby suppressing adipocyte differentiation; restoration of KLF15 expression partially rescues adipogenesis blocked by c-Jun.","method":"ChIP, luciferase reporter assay, stable ectopic expression, adipocyte differentiation rescue assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assay plus rescue experiment, single lab","pmids":["26692489"],"is_preprint":false},{"year":2017,"finding":"SIRT3 co-localizes with KLF15 and directly deacetylates KLF15 in podocytes, resulting in decreased expression of fibronectin and collagen type IV; SIRT3 overexpression attenuates angiotensin II-induced kidney fibrosis through this KLF15-mediated mechanism.","method":"Co-localization (immunofluorescence), deacetylation assay, co-IP, SIRT3 KO/overexpression mice, cultured podocytes","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct deacetylation of KLF15 shown, single lab, in vitro and in vivo evidence","pmids":["28465484"],"is_preprint":false},{"year":2017,"finding":"KLF15 directly activates the Twist2 promoter by binding it (confirmed by ChIP); KLF15-induced Twist2 expression ameliorates hepatic steatosis via NF-κB-FGF21 or SREBP1c-FGF21 pathways.","method":"ChIP, luciferase reporter assay, KLF15 overexpression in hepatocytes","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP confirming promoter binding, single lab, limited mechanistic depth on KLF15 itself","pmids":["31648561"],"is_preprint":false},{"year":2017,"finding":"KLF15 directly binds the promoter of Drd2 (dopamine D2 receptor) and promotes its promoter activity; KLF15 is induced in neurons by TNF-α; knockout of Klf15 reduces neuropathic pain sensitivity induced by CCI or SNI.","method":"Promoter reporter assay, ChIP, Klf15 KO mice, neuropathic pain models (CCI, SNI)","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assay plus in vivo KO phenotype, single lab","pmids":["28830816"],"is_preprint":false},{"year":2017,"finding":"KLF15 directly regulates chondrogenic differentiation of human MSCs by binding the SOX9 promoter and activating SOX9 expression; KLF15 knockdown represses chondrogenic differentiation while KLF15 overexpression facilitates it.","method":"Lentivirus-mediated knockdown, overexpression, luciferase reporter assay, promoter binding analysis (ChIP)","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP/reporter assay plus gain-and-loss-of-function, single lab","pmids":["28923246"],"is_preprint":false},{"year":2018,"finding":"KLF15 directly binds to the core promoter region of bovine KLF3 gene, confirmed by EMSA and ChIP; KLF15 overexpression increases KLF3 expression and KLF15 knockdown reduces it in bovine adipocytes.","method":"Adenoviral overexpression, siRNA knockdown, luciferase reporter assay with deletion constructs, EMSA, ChIP","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and ChIP confirming direct binding, plus functional overexpression/knockdown, single lab","pmids":["29551501"],"is_preprint":false},{"year":2018,"finding":"Hypoxia triggers deSUMOylation of KLF15 by SENP1, causing translocation of KLF15 from nucleus to cytoplasm; nuclear KLF15 directly binds the Arg2 promoter (ChIP) and represses arginase 2 expression; KLF15 overexpression rescues nitric oxide production and reverses hypoxia-induced vasoconstriction.","method":"ChIP, fractionation/localization studies, SENP1 modulation, overexpression in HPMEC, isolated artery functional assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus fractionation demonstrating nuclear export upon deSUMOylation, plus functional vascular assay; multiple orthogonal methods","pmids":["29472234"],"is_preprint":false},{"year":2018,"finding":"KLF15 directly binds the promoter region of MMP-3 (ChIP assay) and reduces TNF-α-induced MMP-3 expression at the transcriptional level in human chondrocytes; TNF-α reduces KLF15 expression via p53.","method":"ChIP, overexpression, quantitative gene expression, cell stimulation with TNF-α","journal":"Journal of interferon & cytokine research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP confirming promoter binding, single lab, limited orthogonal validation","pmids":["30036111"],"is_preprint":false},{"year":2019,"finding":"Hyperglycemia upregulates KLF15 protein in skeletal muscle by downregulating the E3 ubiquitin ligase WWP1, leading to suppression of ubiquitin-dependent degradation of KLF15; muscle-specific KLF15 deficiency protects from diabetes-induced decline of skeletal muscle mass.","method":"Diabetic mouse models, muscle-specific KO mice, WWP1 modulation, ubiquitination assay, protein stability analysis","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic muscle-specific KO plus WWP1-mediated ubiquitination mechanism established in vivo","pmids":["30830866"],"is_preprint":false},{"year":2019,"finding":"WWP1 targets KLF15 for K48-linked polyubiquitination and proteasomal degradation in cardiomyocytes; WWP1-mediated KLF15 degradation contributes to upregulation of p65 acetylation and activation of MAPK inflammatory signaling after myocardial infarction.","method":"rAAV9-mediated overexpression, adenovirus system, ubiquitination assay (K48-linked), co-IP, MI mouse model","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific K48-linked ubiquitination demonstrated by co-IP plus in vivo rescue experiments with defined downstream signaling","pmids":["36593958"],"is_preprint":false},{"year":2019,"finding":"KLF15 regulates all three phases (I–III) of the endobiotic and xenobiotic metabolism (EXM) system in the liver by direct transcriptional control; liver-specific KLF15 deficiency alters expression of phase I–III targets, renders animals resistant to bile acid and acetaminophen toxicity, and enhances degradation of endogenous steroids (testosterone, glucocorticoid); viral reconstitution reverses these phenotypes.","method":"Liver-specific KO mice, unbiased transcriptomics, viral reconstitution, hormone measurement, toxicity assays","journal":"Nature metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — liver-specific KO plus viral rescue, multiple transcriptomic and phenotypic readouts validated across cells, human tissues, and animals","pmids":["32694878"],"is_preprint":false},{"year":2020,"finding":"HDAC11 interacts with AP-2α and represses KLF15 transcription; HDAC11 inhibition or depletion relieves KLF15 repression and blocks pro-fibrogenic responses in renal tubular epithelial cells; KLF15 knockdown antagonizes the anti-fibrotic effect of HDAC11 inhibition.","method":"Co-IP, siRNA knockdown, qPCR, pharmaceutical inhibition (quisinostat), mouse UUO model","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP showing HDAC11-AP2α interaction plus KLF15 rescue experiment, single lab","pmids":["32363192"],"is_preprint":false},{"year":2021,"finding":"Immobilization reduces cytosolic Ca2+ concentration in skeletal muscle via downregulation of Piezo1, which induces KLF15 and subsequently IL-6 expression leading to muscle atrophy; Piezo1 disruption induces Klf15 and Il6, and KLF15 muscle-specific deficiency or IL-6 deficiency protects from immobility-induced atrophy.","method":"Ca2+ bioimaging, Piezo1 acute disruption, muscle-specific KLF15 KO mice, IL-6 KO mice, antibody blockade, human sample validation","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (Piezo1, KLF15-mKO, IL-6 KO) plus novel Ca2+ bioimaging establishing mechanistic pathway","pmids":["35290243"],"is_preprint":false},{"year":2021,"finding":"FoxO1/3 transcriptionally regulates Klf15 gene expression by directly binding to the liver-specific Klf15 promoter; attenuation of insulin signaling increases hepatic KLF15 via FoxOs, which then elevates amino acid catabolic enzyme expression and suppresses SREBP-1c; this FoxO-KLF15 pathway switches macronutrient flow during fasting.","method":"TFEL scan genome-wide transcription factor screening, in vivo promoter analysis, KLF15-KO mice, ChIP-like binding validation","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide TF screening plus in vivo promoter analysis plus KO rescue, identifying direct upstream regulator","pmids":["34988390"],"is_preprint":false},{"year":2022,"finding":"KLF15 directly binds the Serpina6 promoter at a palindromic GC-rich motif, opens chromatin, and transactivates Serpina6 (encoding CBG); Klf15-deficient mice have profoundly reduced CBG and impaired plasma corticosteroid transport; KLF15 cistromes (generated via newly engineered Klf153xFLAG mice) show liver KLF15 is predominantly promoter-enriched with minimal direct gene repression activity.","method":"KLF15 cistrome (ChIP-seq in Klf153xFLAG mice), Klf15-KO mice, CBG reconstitution, ATAC-seq, reporter assays","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide ChIP-seq cistrome plus genetic KO plus reconstitution experiments; multiple orthogonal methods","pmids":["35263131"],"is_preprint":false},{"year":2022,"finding":"KLF15 and PPARδ physically interact (co-localization, co-IP), colocalize genome-wide in skeletal muscle (ChIP-seq), and are mutually dependent for their transcriptional effects on lipid metabolic target genes; KLF15 cistrome in skeletal muscle is enriched at distal intergenic regions associated with circadian rhythmicity and lipid metabolism genes.","method":"ChIP-seq (KLF15 and PPARδ cistromes), Co-IP/physical interaction assay, KLF15 KO in skeletal muscle, gene expression analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP-seq plus co-IP plus genetic KO with functional rescue, characterizing physical and genomic interaction","pmids":["35413288"],"is_preprint":false},{"year":2022,"finding":"KLF15 plays a critical role in brown adipose tissue (BAT) metabolic flexibility; BAT-specific loss of KLF15 results in widespread changes in circulating metabolites and severely compromised thermogenesis under high energy demands, indicating impaired nutrient utilization.","method":"BAT-specific KLF15-KO mice, metabolomics, thermogenesis testing, transcriptomics","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO with metabolomics and defined physiological phenotype (thermogenesis impairment)","pmids":["36304102"],"is_preprint":false},{"year":2022,"finding":"Xenopus Klf15 directly binds regeneration enhancers and stimulates expression of regenerative genes including adrenoreceptor alpha 1A (adra1a) in regenerating nephric tubules; inhibition of Klf15 causes failure of nephric tubule regeneration; pharmacological inhibition of Adra1a-signaling suppresses tubule regeneration.","method":"ATAC-seq, H3K27ac ChIP-seq, Klf15 inhibition, Xenopus kidney regeneration model, pharmacological treatment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide enhancer analysis plus loss-of-function in Xenopus model; relevant ortholog study","pmids":["35939709"],"is_preprint":false},{"year":2023,"finding":"KLF15 directly binds the promoter region of FKBP5 and activates its expression; KLF15 deficiency impairs myoblast fusion and muscle regeneration after injury; local delivery of FKBP5 rescues impaired regeneration in Klf15-KO mice.","method":"ChIP, KLF15-KO mice, muscle injury model, transcriptome analysis, FKBP5 delivery rescue","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct promoter binding plus in vivo KO and rescue experiments","pmids":["37673339"],"is_preprint":false},{"year":2023,"finding":"GR (glucocorticoid receptor) directly binds the KLF15 enhancer during fasting and regulates hepatic KLF15 expression; KLF15 is necessary for GR-mediated suppression of SREBP-1c during fasting, forming a GR-KLF15-SREBP-1c pathway controlling lipogenesis.","method":"KLF15-KO mice, ChIP (GR binding at KLF15 enhancer), gene expression analysis, fasting experiments","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — GR ChIP at KLF15 enhancer plus KO epistasis establishing direct upstream regulatory relationship","pmids":["37702262"],"is_preprint":false},{"year":2023,"finding":"Macrophage KLF15 directly binds the OLR-1 (lectin-like oxidized LDL receptor-1) promoter and transcriptionally downregulates OLR-1 expression; KLF15 overexpression prevents foam cell formation by reducing OLR-1-mediated lipid uptake; restoration of OLR-1 reverses KLF15's beneficial effects on atherosclerosis.","method":"ChIP, promoter reporter assay, AAV overexpression in atherosclerosis mouse models, lipid uptake assay","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus in vivo overexpression with rescue assay, single lab","pmids":["37984156"],"is_preprint":false},{"year":2021,"finding":"KLF15 loss-of-function mutation (p.Lys229*) abrogates both transcriptional activation of the KChIP2 promoter and transcriptional inhibition of the CTGF promoter (with or without TGFB1), establishing KLF15 as causally linked to atrial fibrillation and cardiomyopathy via loss of these transcriptional activities.","method":"Whole exome sequencing, dual-luciferase assay with mutant KLF15, Sanger sequencing, pedigree analysis","journal":"Genes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dual-luciferase functional assay of specific mutant confirming loss of two distinct transcriptional activities, single lab","pmids":["33809104"],"is_preprint":false},{"year":2017,"finding":"KLF15 directly activates the glucocorticoid receptor (GR) by binding a GRE in the KLF15 promoter and is induced by glucocorticoids in human airway smooth muscle (ASM); KLF15 represses ASM hypertrophy and PLCD1 was identified as a direct KLF15-regulated target gene by integrating transcriptome data with ChIP-seq of RNA Pol II and GR occupancy.","method":"GR ChIP-seq, RNA Pol II ChIP-seq, KLF15 overexpression transcriptome, primary human ASM cells","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP-seq integrated with transcriptome to identify direct targets, multiple orthogonal approaches in primary human cells","pmids":["28375666"],"is_preprint":false},{"year":2024,"finding":"KLF15 transcriptionally activates LINC00689 expression; KLF15/LINC00689 axis suppresses colorectal cancer cell proliferation and metastasis; downstream, LINC00689 recruits PTBP1 to stabilize LATS2 mRNA, suppressing the YAP1/β-catenin pathway.","method":"ChIP, reporter assay, RNA-seq, co-IP (PTBP1-LINC00689), in vitro/in vivo cell proliferation assays","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirming KLF15 binding at LINC00689 promoter plus multi-step pathway validation, single lab","pmids":["38273088"],"is_preprint":false},{"year":2024,"finding":"Progesterone receptor (PR) directly binds to KLF15 promoter regions (ChIP-qPCR) in uterine epithelial cells; KLF15 in turn directly binds the TWIST2 promoter (ChIP-qPCR) and promotes epithelial-mesenchymal transition; KLF15 loss impairs endometrial receptivity and reduces embryo implantation in vivo.","method":"ChIP-qPCR, siRNA knockdown, KLF15 overexpression, RNA-seq, in vivo rat uterine injection, embryo implantation assay","journal":"The Journal of endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-qPCR for PR→KLF15 and KLF15→TWIST2 binding plus in vivo implantation phenotype, single lab","pmids":["38513352"],"is_preprint":false},{"year":2021,"finding":"The E3 ubiquitin ligase NEDD4 ubiquitinates KLF15 in skeletal muscle; obestatin signaling counteracts glucocorticoid-induced KLF15 ubiquitination via NEDD4, thereby preventing KLF15-driven atrogene expression and muscle atrophy; FoxO4 phosphorylation by Akt cooperates with NEDD4 in regulating FoxO and KLF15.","method":"In vivo dexamethasone-induced atrophy model, ubiquitination assay, in vitro human myotube (KM155C25) studies","journal":"Journal of cachexia, sarcopenia and muscle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay identifying NEDD4 as E3 ligase for KLF15, plus in vivo and in vitro models, single lab","pmids":["33687156"],"is_preprint":false}],"current_model":"KLF15 is a zinc-finger transcription factor that binds GC-rich consensus elements in target gene promoters to either activate (GLUT4, PPARγ2, AceCS2, FKBP5, Serpina6/CBG, SOX9, Drd2, LINC00689, TWIST2) or repress (CTGF via P/CAF displacement, adrenomedullin, Arg2, OLR-1, SREBP-1c via LXR/RXR-RIP140 complex, MMP-3) transcription; its activity is modulated post-translationally by WWP1- and NEDD4-mediated K48-linked ubiquitination/degradation, SIRT3-mediated deacetylation, and SENP1-mediated deSUMOylation causing nuclear export; upstream regulators include glucocorticoid receptor, FoxO1/3 (fasting/insulin axis), BMAL1/Per3 (circadian clock), and metformin-driven protein instability; through these mechanisms KLF15 orchestrates adipogenesis, hepatic gluconeogenesis and lipogenesis, nitrogen/amino acid homeostasis, circadian metabolic rhythms, cardiac hypertrophy and fibrosis, skeletal muscle atrophy and regeneration, podocyte differentiation, and xenobiotic/endobiotic metabolism."},"narrative":{"mechanistic_narrative":"KLF15 is a zinc-finger transcription factor that binds GC-rich consensus elements through its C-terminal zinc fingers to direct context-specific gene programs governing metabolism, circadian physiology, and tissue differentiation [PMID:15963234, PMID:35263131]. Its zinc fingers recognize a 9 bp core element in a zinc-dependent, sequence-specific manner, and genome-wide cistrome mapping in liver shows KLF15 occupancy is predominantly promoter-enriched and largely activating [PMID:15963234, PMID:35263131]. KLF15 functions combinatorially: it synergizes with partner factors at shared promoters—MEF2A at GLUT4, Sp1 at AceCS2, and C/EBPα at PPARγ2—to drive glucose uptake, mitochondrial acetyl-CoA metabolism, and adipogenesis [PMID:12097321, PMID:14960588, PMID:15664998]. In the fasting liver it forms a complex with LXR/RXR on the Srebf1 promoter, switching the corepressor RIP140 for the coactivator SRC1 to repress lipogenesis, and it coordinates gluconeogenic and amino-acid-degrading enzymes together with PGC-1α to control hepatic glucose and nitrogen homeostasis [PMID:27545894, PMID:20393151, PMID:22405069]. KLF15 also acts as a nodal output of the circadian clock, governing rhythmic nitrogen detoxification and biphasic cardiac transcriptomic oscillation [PMID:22405069, PMID:26686628]. Across tissues it drives differentiation programs by activating lineage genes—nephrin/podocin in podocytes, SOX9 in chondrocytes, and FKBP5 in regenerating muscle [PMID:22493483, PMID:28923246, PMID:37673339]—and can repress targets by displacing coactivators, as in its block of P/CAF recruitment to the CTGF promoter [PMID:18586263]. KLF15 abundance and localization are tightly regulated post-translationally: WWP1- and NEDD4-mediated K48-linked ubiquitination drives proteasomal degradation, SIRT3 deacetylates it, and SENP1-mediated deSUMOylation triggers nuclear export [PMID:30830866, PMID:36593958, PMID:33687156, PMID:28465484, PMID:29472234]. Upstream, hepatic KLF15 is induced during fasting by the glucocorticoid receptor and FoxO1/3 and is embedded in the BMAL1/Per3 clock circuit [PMID:37702262, PMID:34988390, PMID:29186676]. A KLF15 loss-of-function mutation (p.Lys229*) that abolishes its transcriptional activities is causally linked to atrial fibrillation and cardiomyopathy [PMID:33809104].","teleology":[{"year":2002,"claim":"Established KLF15 as a functional transcription factor with a metabolic output by showing it directly activates GLUT4 and increases glucose uptake, framing it as a regulator of cellular glucose handling.","evidence":"Promoter mutagenesis, reporter assays, co-IP with MEF2A, and glucose uptake assays in adipocyte/muscle lines","pmids":["12097321"],"confidence":"High","gaps":["Did not define the genome-wide target repertoire","Mechanism of MEF2A synergy not structurally resolved"]},{"year":2004,"claim":"Extended KLF15's metabolic reach and defined its combinatorial logic by showing cooperative activation with Sp1 at the AceCS2 promoter via adjacent GC-boxes.","evidence":"GST pull-down, promoter deletion/mutation, reporter assays in SL2 cells","pmids":["14960588"],"confidence":"High","gaps":["In vivo relevance to acetyl-CoA metabolism untested in this study"]},{"year":2005,"claim":"Defined the biochemical basis of DNA recognition (zinc-dependent binding of a 9 bp core element) and showed KLF15 can repress as well as activate, broadening its functional range.","evidence":"EMSA, DNaseI footprinting with KLF15-GST, reporter assays on rhodopsin/IRBP promoters","pmids":["15963234"],"confidence":"High","gaps":["Repression mechanism on these promoters not mapped to a corepressor"]},{"year":2005,"claim":"Placed KLF15 upstream in the adipogenic hierarchy by showing it is required for PPARγ2 induction and cooperates with C/EBPα, establishing an essential differentiation role.","evidence":"Dominant-negative, RNAi, overexpression, reporter assays, microarray in 3T3/C2C12","pmids":["15664998"],"confidence":"High","gaps":["Direct binding to PPARγ2 promoter not shown by ChIP in this study"]},{"year":2008,"claim":"Revealed a coactivator-displacement mechanism of repression by showing KLF15 blocks P/CAF recruitment to the CTGF promoter, linking it to cardiac fibrosis suppression.","evidence":"Adenoviral overexpression, ChIP, EMSA, aortic banding in KLF15-/- mice","pmids":["18586263"],"confidence":"High","gaps":["Whether displacement is direct competition or allosteric not resolved"]},{"year":2010,"claim":"Defined a central role in hepatic gluconeogenesis and amino-acid catabolism via PGC-1α coordination, and identified KLF15 protein instability as a node targeted by metformin.","evidence":"Liver-specific KO mice, adenoviral rescue, hepatocyte glucose production assays","pmids":["20393151"],"confidence":"High","gaps":["Molecular basis of metformin-driven KLF15 degradation not identified"]},{"year":2012,"claim":"Established KLF15 as a circadian metabolic regulator by linking it to rhythmic nitrogen-to-urea detoxification under feeding control.","evidence":"Klf15-/- mice, metabolic and circadian profiling, feeding manipulation","pmids":["22405069"],"confidence":"High","gaps":["Direct clock-factor inputs to Klf15 not yet defined at this stage"]},{"year":2012,"claim":"Demonstrated a developmental/differentiation role and an anti-hypertrophic cardiac function via direct promoter binding (nephrin/podocin) and repression of MRTF activity.","evidence":"ChIP, KLF15-/- podocyte injury models, co-IP with MRTF-A/B, rAAV cardiac overexpression","pmids":["22493483","22586493"],"confidence":"High","gaps":["MRTF interaction surface not mapped beyond NLS localization"]},{"year":2013,"claim":"Connected KLF15 to nutrient/insulin signaling by showing its deficiency protects from hepatic insulin resistance and alters mTORC1/AMPK/autophagy via amino acid signaling.","evidence":"KLF15-/- mice, high-fat diet, ER stress induction, primary hepatocyte signaling analysis","pmids":["24167585"],"confidence":"High","gaps":["Direct transcriptional targets bridging KLF15 to mTORC1 not enumerated"]},{"year":2016,"claim":"Defined a fasting-specific lipogenic-repression mechanism: KLF15 assembles with LXR/RXR on Srebf1 and recruits RIP140 over SRC1, switching the promoter to a repressed state.","evidence":"ChIP, reporter assays, complex analysis, mouse overexpression","pmids":["27545894"],"confidence":"High","gaps":["Stoichiometry and direct binding partner within the LXR/RXR complex not resolved"]},{"year":2016,"claim":"Established KLF15 as a circadian output node in the heart governing biphasic active/resting transcriptomic oscillation independent of the core clock.","evidence":"Cardiomyocyte-specific KLF15 depletion, transcriptome and circadian profiling","pmids":["26686628"],"confidence":"High","gaps":["Direct cardiac target genes driving phase partition not individually validated"]},{"year":2018,"claim":"Showed KLF15 localization is dynamically controlled by SUMOylation: hypoxia-driven SENP1 deSUMOylation exports KLF15 from the nucleus, de-repressing Arg2 and altering vascular tone.","evidence":"ChIP, subcellular fractionation, SENP1 modulation, isolated artery functional assay","pmids":["29472234"],"confidence":"High","gaps":["SUMO acceptor site on KLF15 not mapped in this entry"]},{"year":2019,"claim":"Identified WWP1/NEDD4-mediated K48-linked ubiquitination as the dominant control over KLF15 protein levels, linking its stability to muscle atrophy and cardiac inflammation.","evidence":"Muscle- and heart-specific KO mice, WWP1/NEDD4 modulation, K48 ubiquitination co-IP, MI and dexamethasone models","pmids":["30830866","36593958","33687156"],"confidence":"High","gaps":["Ubiquitin acceptor lysines on KLF15 not defined","Hierarchy between WWP1 and NEDD4 across tissues unresolved"]},{"year":2019,"claim":"Established KLF15 as a master transcriptional controller of all three phases of hepatic endobiotic/xenobiotic metabolism, governing drug, bile acid, and steroid handling.","evidence":"Liver-specific KO, transcriptomics, viral reconstitution, hormone and toxicity assays","pmids":["32694878"],"confidence":"High","gaps":["Cofactor requirements for phase I–III gene activation not dissected"]},{"year":2021,"claim":"Linked KLF15 to human disease by demonstrating a loss-of-function truncation (p.Lys229*) abolishes both its activating and repressive transcriptional activities, causing atrial fibrillation and cardiomyopathy.","evidence":"Whole exome sequencing, pedigree analysis, dual-luciferase assays of mutant KLF15 on KChIP2 and CTGF","pmids":["33809104"],"confidence":"Medium","gaps":["Single family/lab functional validation","Structural consequence of truncation on zinc fingers not modeled"]},{"year":2021,"claim":"Defined a mechanosensory atrophy pathway in which immobilization lowers cytosolic Ca2+ via Piezo1, inducing KLF15 and IL-6 to drive muscle wasting.","evidence":"Ca2+ bioimaging, Piezo1 disruption, muscle-specific KLF15 and IL-6 KO mice, human validation","pmids":["35290243"],"confidence":"High","gaps":["Direct transcriptional link from KLF15 to Il6 not defined at promoter level"]},{"year":2022,"claim":"Provided genome-wide definition of KLF15 occupancy and a physical PPARδ partnership, plus a direct CBG/corticosteroid-transport program, refining its mechanism as a promoter-enriched activator.","evidence":"ChIP-seq cistromes in Klf15-3xFLAG mice, ATAC-seq, co-IP with PPARδ, KO and reconstitution","pmids":["35263131","35413288"],"confidence":"High","gaps":["Determinants of tissue-specific promoter vs distal-enhancer occupancy not resolved"]},{"year":2023,"claim":"Mapped the upstream fasting circuit by showing glucocorticoid receptor and FoxO1/3 directly bind the KLF15 enhancer/promoter, placing KLF15 downstream of the insulin/glucocorticoid axis to switch macronutrient flow.","evidence":"GR and FoxO ChIP/binding analysis, KLF15-KO epistasis, fasting experiments","pmids":["37702262","34988390"],"confidence":"High","gaps":["Relative contribution of GR vs FoxO inputs in different fasting states not quantified"]},{"year":2023,"claim":"Demonstrated a regenerative differentiation role in muscle by showing KLF15 directly activates FKBP5 to enable myoblast fusion and repair, with FKBP5 delivery rescuing the KO.","evidence":"ChIP, KLF15-KO muscle injury model, transcriptomics, FKBP5 rescue","pmids":["37673339"],"confidence":"High","gaps":["Mechanism by which FKBP5 promotes fusion downstream of KLF15 not detailed"]},{"year":2024,"claim":"Extended KLF15's gene-regulatory roles to reproduction and cancer suppression through direct activation of TWIST2 and LINC00689 programs.","evidence":"ChIP-qPCR, RNA-seq, in vivo implantation and tumor proliferation assays","pmids":["38513352","38273088"],"confidence":"Medium","gaps":["Single-lab findings","Tissue-specific selection of these targets versus metabolic targets unexplained"]},{"year":null,"claim":"How KLF15 selects activating versus repressive modes and tissue-specific target sets across its diverse programs remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking partner choice (Sp1, C/EBPα, LXR/RXR, PPARδ) to activate/repress decision","Ubiquitin/SUMO/acetyl acceptor residues largely unmapped","Structural basis of zinc-finger–promoter recognition not solved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2,3,4,18,35]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[3,5,10,35]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,12,18]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[12,27,35]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[27]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,2,3,35]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[7,13,18,31,37]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[13,17,20]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[29,30,46]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,10,25,39]}],"complexes":["KLF15-LXR/RXR-RIP140 corepressor complex on Srebf1 promoter"],"partners":["MEF2A","SP1","CEBPA","MRTF-A","PPARD","WWP1","NEDD4","SIRT3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UIH9","full_name":"Krueppel-like factor 15","aliases":["Kidney-enriched krueppel-like factor"],"length_aa":416,"mass_kda":44.0,"function":"Transcriptional regulator that binds to the GA element of the CLCNKA promoter. Binds to the KCNIP2 promoter and regulates KCNIP2 circadian expression in the heart (By similarity). Is a repressor of CCN2 expression, involved in the control of cardiac fibrosis. It is also involved in the control of cardiac hypertrophy acting through the inhibition of MEF2A and GATA4 (By similarity). Involved in podocyte differentiation (By similarity). Inhibits MYOCD activity. Is a negative regulator of TP53 acetylation. Inhibits NF-kappa-B activation through repression of EP300-dependent RELA acetylation","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9UIH9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KLF15","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KLF15","total_profiled":1310},"omim":[{"mim_id":"609032","title":"FSHD REGION GENE 2; FRG2","url":"https://www.omim.org/entry/609032"},{"mim_id":"606465","title":"KLF TRANSCRIPTION FACTOR 15; KLF15","url":"https://www.omim.org/entry/606465"},{"mim_id":"606009","title":"DOUBLE HOMEOBOX PROTEIN 4; DUX4","url":"https://www.omim.org/entry/606009"},{"mim_id":"604661","title":"POTASSIUM CHANNEL-INTERACTING PROTEIN 2; KCNIP2","url":"https://www.omim.org/entry/604661"},{"mim_id":"601471","title":"FACIAL PARESIS, HEREDITARY CONGENITAL, 1; HCFP1","url":"https://www.omim.org/entry/601471"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nuclear speckles","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"liver","ntpm":88.7}],"url":"https://www.proteinatlas.org/search/KLF15"},"hgnc":{"alias_symbol":["KKLF"],"prev_symbol":[]},"alphafold":{"accession":"Q9UIH9","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UIH9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UIH9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UIH9-F1-predicted_aligned_error_v6.png","plddt_mean":50.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KLF15","jax_strain_url":"https://www.jax.org/strain/search?query=KLF15"},"sequence":{"accession":"Q9UIH9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UIH9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UIH9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UIH9"}},"corpus_meta":[{"pmid":"15664998","id":"PMC_15664998","title":"Role of Krüppel-like factor 15 (KLF15) in transcriptional regulation of 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insulin-stimulated glucose uptake in adipocytes.\",\n      \"method\": \"Co-transfection/reporter assays, promoter deletion and mutational analyses, co-immunoprecipitation, glucose uptake assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional assays, promoter mutagenesis, co-IP, and direct glucose uptake measurement in one rigorous study\",\n      \"pmids\": [\"12097321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"KLF15 transcriptionally activates the mitochondrial acetyl-CoA synthetase gene AceCS2 through the most proximal KLF-binding site in its promoter; KLF15 physically interacts with Sp1 (GST pull-down) and synergistically activates the AceCS2 promoter with Sp1 through an adjacent GC-box.\",\n      \"method\": \"Luciferase reporter assays, promoter deletion/mutation analyses, GST pull-down, Drosophila SL2 cell transfection, quantitative RT-PCR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro pull-down interaction plus multiple orthogonal promoter assays and mutagenesis in one study\",\n      \"pmids\": [\"14960588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"KLF15 plays an essential role in adipogenesis by transcriptionally upregulating PPARγ2; KLF15 and C/EBPα synergistically activate the PPARγ2 promoter; dominant-negative KLF15 or RNAi reduces PPARγ expression and blocks adipogenesis without affecting C/EBPβ induction; C/EBPα, C/EBPβ, and C/EBPδ can induce KLF15 expression.\",\n      \"method\": \"Dominant-negative overexpression, RNA interference, ectopic overexpression in NIH 3T3/C2C12 cells, luciferase reporter assay, microarray\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function (two independent methods: DN and RNAi) plus gain-of-function plus promoter assays with defined epistasis\",\n      \"pmids\": [\"15664998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"KLF15 zinc-finger domains bind a 9 bp consensus sequence (core CG/TCCCC) in a zinc-dependent, sequence-specific manner; KLF15 binds multiple sites in the rhodopsin and IRBP promoters including the CRS-1 and G-rich repressor elements, and represses promoter activation by CRX and/or NRL.\",\n      \"method\": \"EMSA, DNaseI footprinting with KLF15-GST fusion protein, luciferase reporter assay\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical binding assays (EMSA + footprinting) plus functional reporter assays in one study\",\n      \"pmids\": [\"15963234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"KLF15 inhibits CTGF expression in cardiac fibroblasts by blocking recruitment of the co-activator P/CAF to the CTGF promoter without affecting Smad3-DNA binding; KLF15 overexpression suppresses basal and TGFβ1-induced CTGF promoter activity; KLF15-/- mice subjected to aortic banding show increased CTGF and fibrosis.\",\n      \"method\": \"Adenoviral overexpression, luciferase reporter assay, ChIP, EMSA, aortic banding mouse model\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus EMSA plus in vivo KO model with defined molecular mechanism (P/CAF recruitment)\",\n      \"pmids\": [\"18586263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"KLF15 directly binds the HSD17B5 (17β-HSD5) promoter and transcriptionally activates it, increasing testosterone formation; a KLF15 binding site was identified by luciferase reporter constructs, EMSA, and ChIP; insulin increases KLF15 mRNA and HSD17B5 promoter activity.\",\n      \"method\": \"Luciferase reporter assay, EMSA, chromatin immunoprecipitation (ChIP), RT-PCR\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — three orthogonal methods (EMSA, ChIP, reporter assay) in one study establishing direct promoter binding\",\n      \"pmids\": [\"19366843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"miR-133 targets the 3'UTR of KLF15 and reduces its protein level, thereby decreasing GLUT4 expression and insulin-mediated glucose uptake in cardiomyocytes.\",\n      \"method\": \"Forced expression of miR-133, lenti-decoy reporter, western blot, glucose uptake assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, functional miRNA-target relationship demonstrated but direct 3'UTR luciferase validation only implied, not explicitly stated\",\n      \"pmids\": [\"19720047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KLF15 regulates hepatic gluconeogenesis by coordinating expression of gluconeogenic and amino acid-degrading enzyme genes with the coactivator PGC-1α; liver-specific KLF15 ablation in diabetic mice reduces gluconeogenic gene expression and ameliorates hyperglycemia; metformin reduces KLF15 abundance by accelerating its degradation and reducing its mRNA, and its suppression of gluconeogenesis is attenuated by restoration of KLF15.\",\n      \"method\": \"Liver-specific KO mice, adenoviral KLF15 restoration, cultured hepatocytes, glucose production assay, gene expression analysis\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — liver-specific genetic ablation plus rescue experiments with defined phenotypic and molecular readouts\",\n      \"pmids\": [\"20393151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KLF15 directly activates transcription of the UCP1 promoter through GT-box elements in brown adipocytes; KLF15 and KLF11 both interact directly with the UCP1 promoter.\",\n      \"method\": \"Promoter reporter assay, co-transfection in mesenchymal stem cell line, promoter binding analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional reporter assay showing direct promoter interaction, single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"20709022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KLF15 and Sp1 cooperatively activate the human LRP5 promoter through adjacent binding sites in the -72 to -53 bp region; ChIP confirms KLF15 and Sp1 binding to this region in cells; Drosophila SL2 cell transactivation is dependent on intact Sp1 and KLF15 binding motifs.\",\n      \"method\": \"Luciferase reporter assay, ChIP, Drosophila SL2 cell transfection, mutational analysis\",\n      \"journal\": \"BMC genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter/mutagenesis, single lab\",\n      \"pmids\": [\"20141633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"KLF15 is required for podocyte differentiation; KLF15 binds to promoter regions of nephrin and podocin (ChIP); KLF15-/- mice show increased susceptibility to podocyte injury; overexpression of KLF15 stimulates expression of differentiation markers.\",\n      \"method\": \"ChIP, KLF15-/- mice with LPS/adriamycin challenge, adenoviral overexpression, reporter assay, microarray\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct promoter binding plus in vivo KO phenotype with multiple readouts\",\n      \"pmids\": [\"22493483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"KLF15 inhibits estrogen-induced uterine epithelial cell proliferation by binding the Mcm2 promoter under progesterone regulation, recruiting HDAC1/3, increasing H3 methylation and decreasing H3 acetylation, and inhibiting RNA polymerase II binding; KLF15 ectopic expression in an estrogenized uterus mimics progesterone's inhibition of MCM2 and DNA synthesis.\",\n      \"method\": \"ChIP, transient transfection, in vivo uterine injection, cell proliferation assay, histone modification analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating promoter binding and histone modification changes, plus in vivo functional confirmation\",\n      \"pmids\": [\"22538816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"KLF15 interacts with and strongly represses the transcriptional activity of myocardin-related transcription factors MRTF-A and MRTF-B; the nuclear localization signal of KLF15 was mapped to a region within its C-terminal zinc fingers; cardiac overexpression of KLF15 via rAAV prevents angiotensin II-induced cardiac hypertrophy.\",\n      \"method\": \"Co-immunoprecipitation/interaction assay, reporter assay, rAAV cardiac overexpression, mouse model of angiotensin II-induced hypertrophy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional interaction assay plus in vivo rescue, single lab\",\n      \"pmids\": [\"22586493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"KLF15 deficiency disrupts circadian amino acid rhythms and impairs rhythmic ammonia-to-urea detoxification; Klf15 transcriptionally coordinates rhythmic expression of multiple enzymes involved in nitrogen homeostasis; feeding plays a dominant role in modulating KLF15 rhythm.\",\n      \"method\": \"Klf15-/- mice, metabolic profiling, circadian rhythm analysis, feeding manipulation\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with defined biochemical phenotype (amino acid/urea rhythm) and mechanistic pathway placement\",\n      \"pmids\": [\"22405069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"KLF15 is an essential mediator of ER stress-induced insulin resistance in the liver; KLF15-/- mice are protected from hepatic insulin resistance under high-fat feeding; KLF15 deficiency is associated with decreased mTORC1 activity, increased AMPK phosphorylation, and activation of autophagy; KLF15 controls mTORC1-mediated insulin resistance via amino acid signaling in primary hepatocytes.\",\n      \"method\": \"KLF15-/- mice, high-fat diet, pharmacological ER stress induction, primary hepatocyte assays, mTORC1/AMPK signaling analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with in vivo and in vitro phenotype across multiple signaling readouts\",\n      \"pmids\": [\"24167585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KLF15 regulates slow myosin heavy chain (MHC-β/slow) expression in muscle by binding the NFATc1 promoter and inducing its activity, thereby mediating calcineurin/NFAT signaling; this was shown by gene silencing, overexpression, and luciferase reporter assay in C2C12 myotubes.\",\n      \"method\": \"Gene silencing (siRNA), overexpression, luciferase reporter assay, gene expression analysis in C2C12 myotubes\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter assay with knockdown and overexpression, single lab\",\n      \"pmids\": [\"24680826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KLF15 is the first identified negative regulator of circadian ileal Fgf15 expression; using biochemical, molecular, and functional assays (including ileectomy and bile duct catheterization), liver-specific KLF15-KO studies showed a non-hepatic basis for bile acid regulation, and KLF15 controls circadian bile acid production through regulation of Fgf15.\",\n      \"method\": \"Systemic and liver-specific Klf15-KO mice, bile acid/lipid absorption measurement, ileectomy, bile duct catheterization, molecular assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models plus invasive functional assays (ileectomy, catheterization), single lab but orthogonal approaches\",\n      \"pmids\": [\"26040986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KLF15 governs biphasic transcriptomic oscillation in the heart corresponding to active (ATP production) and resting (remodeling/repair) phases; cardiomyocyte-specific depletion of KLF15 leads to disorganized oscillatory behavior without phasic partition despite an intact core clock, establishing KLF15 as a nodal connection between the circadian clock and cardiac rhythmicity.\",\n      \"method\": \"Cardiomyocyte-specific KLF15 depletion, transcriptome profiling, circadian rhythm analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO with genome-wide transcriptomic phenotype and defined biological process\",\n      \"pmids\": [\"26686628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"During fasting, KLF15 forms a complex with LXR/RXR specifically on the Srebf1 promoter, recruiting the corepressor RIP140 instead of the coactivator SRC1, thereby repressing SREBP-1c and downstream lipogenic enzyme expression; KLF15 overexpression specifically ameliorates hypertriglyceridemia.\",\n      \"method\": \"ChIP, promoter reporter assay, protein complex analysis (co-immunoprecipitation implied), mouse overexpression model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating complex formation on specific promoter with defined coregulator switch (RIP140 vs SRC1), plus in vivo phenotype\",\n      \"pmids\": [\"27545894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KLF15 binds to the ACSL1 promoter region and drives its transcription in bovine adipocytes; this was confirmed by mutational analysis and EMSA; E2F1, Sp1, E2F4, and KLF15 all bind the ACSL1 promoter proximal region.\",\n      \"method\": \"Luciferase reporter assay, EMSA, ChIP (implied), mutational analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and reporter assays with mutagenesis, single lab\",\n      \"pmids\": [\"26782942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Per3 and BMAL1 directly regulate Klf15 expression in adipocyte precursor cells; deletion of Per3 promotes adipogenesis in vivo through this clock output pathway acting via KLF15.\",\n      \"method\": \"Per3 deletion mice, in vivo adipogenesis analysis, chromatin analysis of BMAL1/Per3 binding at Klf15 promoter\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model with molecular binding evidence for BMAL1/Per3 regulation of Klf15, single lab\",\n      \"pmids\": [\"29186676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"c-Jun directly binds near glucocorticoid response element (GRE) sites in the KLF15 promoter and inhibits glucocorticoid receptor (GR)-induced KLF15 promoter activity, thereby suppressing adipocyte differentiation; restoration of KLF15 expression partially rescues adipogenesis blocked by c-Jun.\",\n      \"method\": \"ChIP, luciferase reporter assay, stable ectopic expression, adipocyte differentiation rescue assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assay plus rescue experiment, single lab\",\n      \"pmids\": [\"26692489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SIRT3 co-localizes with KLF15 and directly deacetylates KLF15 in podocytes, resulting in decreased expression of fibronectin and collagen type IV; SIRT3 overexpression attenuates angiotensin II-induced kidney fibrosis through this KLF15-mediated mechanism.\",\n      \"method\": \"Co-localization (immunofluorescence), deacetylation assay, co-IP, SIRT3 KO/overexpression mice, cultured podocytes\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct deacetylation of KLF15 shown, single lab, in vitro and in vivo evidence\",\n      \"pmids\": [\"28465484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KLF15 directly activates the Twist2 promoter by binding it (confirmed by ChIP); KLF15-induced Twist2 expression ameliorates hepatic steatosis via NF-κB-FGF21 or SREBP1c-FGF21 pathways.\",\n      \"method\": \"ChIP, luciferase reporter assay, KLF15 overexpression in hepatocytes\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP confirming promoter binding, single lab, limited mechanistic depth on KLF15 itself\",\n      \"pmids\": [\"31648561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KLF15 directly binds the promoter of Drd2 (dopamine D2 receptor) and promotes its promoter activity; KLF15 is induced in neurons by TNF-α; knockout of Klf15 reduces neuropathic pain sensitivity induced by CCI or SNI.\",\n      \"method\": \"Promoter reporter assay, ChIP, Klf15 KO mice, neuropathic pain models (CCI, SNI)\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assay plus in vivo KO phenotype, single lab\",\n      \"pmids\": [\"28830816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KLF15 directly regulates chondrogenic differentiation of human MSCs by binding the SOX9 promoter and activating SOX9 expression; KLF15 knockdown represses chondrogenic differentiation while KLF15 overexpression facilitates it.\",\n      \"method\": \"Lentivirus-mediated knockdown, overexpression, luciferase reporter assay, promoter binding analysis (ChIP)\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP/reporter assay plus gain-and-loss-of-function, single lab\",\n      \"pmids\": [\"28923246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"KLF15 directly binds to the core promoter region of bovine KLF3 gene, confirmed by EMSA and ChIP; KLF15 overexpression increases KLF3 expression and KLF15 knockdown reduces it in bovine adipocytes.\",\n      \"method\": \"Adenoviral overexpression, siRNA knockdown, luciferase reporter assay with deletion constructs, EMSA, ChIP\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and ChIP confirming direct binding, plus functional overexpression/knockdown, single lab\",\n      \"pmids\": [\"29551501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Hypoxia triggers deSUMOylation of KLF15 by SENP1, causing translocation of KLF15 from nucleus to cytoplasm; nuclear KLF15 directly binds the Arg2 promoter (ChIP) and represses arginase 2 expression; KLF15 overexpression rescues nitric oxide production and reverses hypoxia-induced vasoconstriction.\",\n      \"method\": \"ChIP, fractionation/localization studies, SENP1 modulation, overexpression in HPMEC, isolated artery functional assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus fractionation demonstrating nuclear export upon deSUMOylation, plus functional vascular assay; multiple orthogonal methods\",\n      \"pmids\": [\"29472234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"KLF15 directly binds the promoter region of MMP-3 (ChIP assay) and reduces TNF-α-induced MMP-3 expression at the transcriptional level in human chondrocytes; TNF-α reduces KLF15 expression via p53.\",\n      \"method\": \"ChIP, overexpression, quantitative gene expression, cell stimulation with TNF-α\",\n      \"journal\": \"Journal of interferon & cytokine research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP confirming promoter binding, single lab, limited orthogonal validation\",\n      \"pmids\": [\"30036111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Hyperglycemia upregulates KLF15 protein in skeletal muscle by downregulating the E3 ubiquitin ligase WWP1, leading to suppression of ubiquitin-dependent degradation of KLF15; muscle-specific KLF15 deficiency protects from diabetes-induced decline of skeletal muscle mass.\",\n      \"method\": \"Diabetic mouse models, muscle-specific KO mice, WWP1 modulation, ubiquitination assay, protein stability analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic muscle-specific KO plus WWP1-mediated ubiquitination mechanism established in vivo\",\n      \"pmids\": [\"30830866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"WWP1 targets KLF15 for K48-linked polyubiquitination and proteasomal degradation in cardiomyocytes; WWP1-mediated KLF15 degradation contributes to upregulation of p65 acetylation and activation of MAPK inflammatory signaling after myocardial infarction.\",\n      \"method\": \"rAAV9-mediated overexpression, adenovirus system, ubiquitination assay (K48-linked), co-IP, MI mouse model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific K48-linked ubiquitination demonstrated by co-IP plus in vivo rescue experiments with defined downstream signaling\",\n      \"pmids\": [\"36593958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KLF15 regulates all three phases (I–III) of the endobiotic and xenobiotic metabolism (EXM) system in the liver by direct transcriptional control; liver-specific KLF15 deficiency alters expression of phase I–III targets, renders animals resistant to bile acid and acetaminophen toxicity, and enhances degradation of endogenous steroids (testosterone, glucocorticoid); viral reconstitution reverses these phenotypes.\",\n      \"method\": \"Liver-specific KO mice, unbiased transcriptomics, viral reconstitution, hormone measurement, toxicity assays\",\n      \"journal\": \"Nature metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — liver-specific KO plus viral rescue, multiple transcriptomic and phenotypic readouts validated across cells, human tissues, and animals\",\n      \"pmids\": [\"32694878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HDAC11 interacts with AP-2α and represses KLF15 transcription; HDAC11 inhibition or depletion relieves KLF15 repression and blocks pro-fibrogenic responses in renal tubular epithelial cells; KLF15 knockdown antagonizes the anti-fibrotic effect of HDAC11 inhibition.\",\n      \"method\": \"Co-IP, siRNA knockdown, qPCR, pharmaceutical inhibition (quisinostat), mouse UUO model\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP showing HDAC11-AP2α interaction plus KLF15 rescue experiment, single lab\",\n      \"pmids\": [\"32363192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Immobilization reduces cytosolic Ca2+ concentration in skeletal muscle via downregulation of Piezo1, which induces KLF15 and subsequently IL-6 expression leading to muscle atrophy; Piezo1 disruption induces Klf15 and Il6, and KLF15 muscle-specific deficiency or IL-6 deficiency protects from immobility-induced atrophy.\",\n      \"method\": \"Ca2+ bioimaging, Piezo1 acute disruption, muscle-specific KLF15 KO mice, IL-6 KO mice, antibody blockade, human sample validation\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (Piezo1, KLF15-mKO, IL-6 KO) plus novel Ca2+ bioimaging establishing mechanistic pathway\",\n      \"pmids\": [\"35290243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FoxO1/3 transcriptionally regulates Klf15 gene expression by directly binding to the liver-specific Klf15 promoter; attenuation of insulin signaling increases hepatic KLF15 via FoxOs, which then elevates amino acid catabolic enzyme expression and suppresses SREBP-1c; this FoxO-KLF15 pathway switches macronutrient flow during fasting.\",\n      \"method\": \"TFEL scan genome-wide transcription factor screening, in vivo promoter analysis, KLF15-KO mice, ChIP-like binding validation\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide TF screening plus in vivo promoter analysis plus KO rescue, identifying direct upstream regulator\",\n      \"pmids\": [\"34988390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF15 directly binds the Serpina6 promoter at a palindromic GC-rich motif, opens chromatin, and transactivates Serpina6 (encoding CBG); Klf15-deficient mice have profoundly reduced CBG and impaired plasma corticosteroid transport; KLF15 cistromes (generated via newly engineered Klf153xFLAG mice) show liver KLF15 is predominantly promoter-enriched with minimal direct gene repression activity.\",\n      \"method\": \"KLF15 cistrome (ChIP-seq in Klf153xFLAG mice), Klf15-KO mice, CBG reconstitution, ATAC-seq, reporter assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide ChIP-seq cistrome plus genetic KO plus reconstitution experiments; multiple orthogonal methods\",\n      \"pmids\": [\"35263131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF15 and PPARδ physically interact (co-localization, co-IP), colocalize genome-wide in skeletal muscle (ChIP-seq), and are mutually dependent for their transcriptional effects on lipid metabolic target genes; KLF15 cistrome in skeletal muscle is enriched at distal intergenic regions associated with circadian rhythmicity and lipid metabolism genes.\",\n      \"method\": \"ChIP-seq (KLF15 and PPARδ cistromes), Co-IP/physical interaction assay, KLF15 KO in skeletal muscle, gene expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP-seq plus co-IP plus genetic KO with functional rescue, characterizing physical and genomic interaction\",\n      \"pmids\": [\"35413288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF15 plays a critical role in brown adipose tissue (BAT) metabolic flexibility; BAT-specific loss of KLF15 results in widespread changes in circulating metabolites and severely compromised thermogenesis under high energy demands, indicating impaired nutrient utilization.\",\n      \"method\": \"BAT-specific KLF15-KO mice, metabolomics, thermogenesis testing, transcriptomics\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO with metabolomics and defined physiological phenotype (thermogenesis impairment)\",\n      \"pmids\": [\"36304102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Xenopus Klf15 directly binds regeneration enhancers and stimulates expression of regenerative genes including adrenoreceptor alpha 1A (adra1a) in regenerating nephric tubules; inhibition of Klf15 causes failure of nephric tubule regeneration; pharmacological inhibition of Adra1a-signaling suppresses tubule regeneration.\",\n      \"method\": \"ATAC-seq, H3K27ac ChIP-seq, Klf15 inhibition, Xenopus kidney regeneration model, pharmacological treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide enhancer analysis plus loss-of-function in Xenopus model; relevant ortholog study\",\n      \"pmids\": [\"35939709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KLF15 directly binds the promoter region of FKBP5 and activates its expression; KLF15 deficiency impairs myoblast fusion and muscle regeneration after injury; local delivery of FKBP5 rescues impaired regeneration in Klf15-KO mice.\",\n      \"method\": \"ChIP, KLF15-KO mice, muscle injury model, transcriptome analysis, FKBP5 delivery rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct promoter binding plus in vivo KO and rescue experiments\",\n      \"pmids\": [\"37673339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GR (glucocorticoid receptor) directly binds the KLF15 enhancer during fasting and regulates hepatic KLF15 expression; KLF15 is necessary for GR-mediated suppression of SREBP-1c during fasting, forming a GR-KLF15-SREBP-1c pathway controlling lipogenesis.\",\n      \"method\": \"KLF15-KO mice, ChIP (GR binding at KLF15 enhancer), gene expression analysis, fasting experiments\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — GR ChIP at KLF15 enhancer plus KO epistasis establishing direct upstream regulatory relationship\",\n      \"pmids\": [\"37702262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Macrophage KLF15 directly binds the OLR-1 (lectin-like oxidized LDL receptor-1) promoter and transcriptionally downregulates OLR-1 expression; KLF15 overexpression prevents foam cell formation by reducing OLR-1-mediated lipid uptake; restoration of OLR-1 reverses KLF15's beneficial effects on atherosclerosis.\",\n      \"method\": \"ChIP, promoter reporter assay, AAV overexpression in atherosclerosis mouse models, lipid uptake assay\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus in vivo overexpression with rescue assay, single lab\",\n      \"pmids\": [\"37984156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KLF15 loss-of-function mutation (p.Lys229*) abrogates both transcriptional activation of the KChIP2 promoter and transcriptional inhibition of the CTGF promoter (with or without TGFB1), establishing KLF15 as causally linked to atrial fibrillation and cardiomyopathy via loss of these transcriptional activities.\",\n      \"method\": \"Whole exome sequencing, dual-luciferase assay with mutant KLF15, Sanger sequencing, pedigree analysis\",\n      \"journal\": \"Genes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dual-luciferase functional assay of specific mutant confirming loss of two distinct transcriptional activities, single lab\",\n      \"pmids\": [\"33809104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KLF15 directly activates the glucocorticoid receptor (GR) by binding a GRE in the KLF15 promoter and is induced by glucocorticoids in human airway smooth muscle (ASM); KLF15 represses ASM hypertrophy and PLCD1 was identified as a direct KLF15-regulated target gene by integrating transcriptome data with ChIP-seq of RNA Pol II and GR occupancy.\",\n      \"method\": \"GR ChIP-seq, RNA Pol II ChIP-seq, KLF15 overexpression transcriptome, primary human ASM cells\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP-seq integrated with transcriptome to identify direct targets, multiple orthogonal approaches in primary human cells\",\n      \"pmids\": [\"28375666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KLF15 transcriptionally activates LINC00689 expression; KLF15/LINC00689 axis suppresses colorectal cancer cell proliferation and metastasis; downstream, LINC00689 recruits PTBP1 to stabilize LATS2 mRNA, suppressing the YAP1/β-catenin pathway.\",\n      \"method\": \"ChIP, reporter assay, RNA-seq, co-IP (PTBP1-LINC00689), in vitro/in vivo cell proliferation assays\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirming KLF15 binding at LINC00689 promoter plus multi-step pathway validation, single lab\",\n      \"pmids\": [\"38273088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Progesterone receptor (PR) directly binds to KLF15 promoter regions (ChIP-qPCR) in uterine epithelial cells; KLF15 in turn directly binds the TWIST2 promoter (ChIP-qPCR) and promotes epithelial-mesenchymal transition; KLF15 loss impairs endometrial receptivity and reduces embryo implantation in vivo.\",\n      \"method\": \"ChIP-qPCR, siRNA knockdown, KLF15 overexpression, RNA-seq, in vivo rat uterine injection, embryo implantation assay\",\n      \"journal\": \"The Journal of endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-qPCR for PR→KLF15 and KLF15→TWIST2 binding plus in vivo implantation phenotype, single lab\",\n      \"pmids\": [\"38513352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The E3 ubiquitin ligase NEDD4 ubiquitinates KLF15 in skeletal muscle; obestatin signaling counteracts glucocorticoid-induced KLF15 ubiquitination via NEDD4, thereby preventing KLF15-driven atrogene expression and muscle atrophy; FoxO4 phosphorylation by Akt cooperates with NEDD4 in regulating FoxO and KLF15.\",\n      \"method\": \"In vivo dexamethasone-induced atrophy model, ubiquitination assay, in vitro human myotube (KM155C25) studies\",\n      \"journal\": \"Journal of cachexia, sarcopenia and muscle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay identifying NEDD4 as E3 ligase for KLF15, plus in vivo and in vitro models, single lab\",\n      \"pmids\": [\"33687156\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KLF15 is a zinc-finger transcription factor that binds GC-rich consensus elements in target gene promoters to either activate (GLUT4, PPARγ2, AceCS2, FKBP5, Serpina6/CBG, SOX9, Drd2, LINC00689, TWIST2) or repress (CTGF via P/CAF displacement, adrenomedullin, Arg2, OLR-1, SREBP-1c via LXR/RXR-RIP140 complex, MMP-3) transcription; its activity is modulated post-translationally by WWP1- and NEDD4-mediated K48-linked ubiquitination/degradation, SIRT3-mediated deacetylation, and SENP1-mediated deSUMOylation causing nuclear export; upstream regulators include glucocorticoid receptor, FoxO1/3 (fasting/insulin axis), BMAL1/Per3 (circadian clock), and metformin-driven protein instability; through these mechanisms KLF15 orchestrates adipogenesis, hepatic gluconeogenesis and lipogenesis, nitrogen/amino acid homeostasis, circadian metabolic rhythms, cardiac hypertrophy and fibrosis, skeletal muscle atrophy and regeneration, podocyte differentiation, and xenobiotic/endobiotic metabolism.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KLF15 is a zinc-finger transcription factor that binds GC-rich consensus elements through its C-terminal zinc fingers to direct context-specific gene programs governing metabolism, circadian physiology, and tissue differentiation [#3, #35]. Its zinc fingers recognize a 9 bp core element in a zinc-dependent, sequence-specific manner, and genome-wide cistrome mapping in liver shows KLF15 occupancy is predominantly promoter-enriched and largely activating [#3, #35]. KLF15 functions combinatorially: it synergizes with partner factors at shared promoters—MEF2A at GLUT4, Sp1 at AceCS2, and C/EBP\\u03b1 at PPAR\\u03b32—to drive glucose uptake, mitochondrial acetyl-CoA metabolism, and adipogenesis [#0, #1, #2]. In the fasting liver it forms a complex with LXR/RXR on the Srebf1 promoter, switching the corepressor RIP140 for the coactivator SRC1 to repress lipogenesis, and it coordinates gluconeogenic and amino-acid-degrading enzymes together with PGC-1\\u03b1 to control hepatic glucose and nitrogen homeostasis [#18, #7, #13]. KLF15 also acts as a nodal output of the circadian clock, governing rhythmic nitrogen detoxification and biphasic cardiac transcriptomic oscillation [#13, #17]. Across tissues it drives differentiation programs by activating lineage genes—nephrin/podocin in podocytes, SOX9 in chondrocytes, and FKBP5 in regenerating muscle [#10, #25, #39]—and can repress targets by displacing coactivators, as in its block of P/CAF recruitment to the CTGF promoter [#4]. KLF15 abundance and localization are tightly regulated post-translationally: WWP1- and NEDD4-mediated K48-linked ubiquitination drives proteasomal degradation, SIRT3 deacetylates it, and SENP1-mediated deSUMOylation triggers nuclear export [#29, #30, #46, #22, #27]. Upstream, hepatic KLF15 is induced during fasting by the glucocorticoid receptor and FoxO1/3 and is embedded in the BMAL1/Per3 clock circuit [#40, #34, #20]. A KLF15 loss-of-function mutation (p.Lys229*) that abolishes its transcriptional activities is causally linked to atrial fibrillation and cardiomyopathy [#42].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established KLF15 as a functional transcription factor with a metabolic output by showing it directly activates GLUT4 and increases glucose uptake, framing it as a regulator of cellular glucose handling.\",\n      \"evidence\": \"Promoter mutagenesis, reporter assays, co-IP with MEF2A, and glucose uptake assays in adipocyte/muscle lines\",\n      \"pmids\": [\"12097321\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the genome-wide target repertoire\", \"Mechanism of MEF2A synergy not structurally resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended KLF15's metabolic reach and defined its combinatorial logic by showing cooperative activation with Sp1 at the AceCS2 promoter via adjacent GC-boxes.\",\n      \"evidence\": \"GST pull-down, promoter deletion/mutation, reporter assays in SL2 cells\",\n      \"pmids\": [\"14960588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance to acetyl-CoA metabolism untested in this study\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the biochemical basis of DNA recognition (zinc-dependent binding of a 9 bp core element) and showed KLF15 can repress as well as activate, broadening its functional range.\",\n      \"evidence\": \"EMSA, DNaseI footprinting with KLF15-GST, reporter assays on rhodopsin/IRBP promoters\",\n      \"pmids\": [\"15963234\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Repression mechanism on these promoters not mapped to a corepressor\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Placed KLF15 upstream in the adipogenic hierarchy by showing it is required for PPAR\\u03b32 induction and cooperates with C/EBP\\u03b1, establishing an essential differentiation role.\",\n      \"evidence\": \"Dominant-negative, RNAi, overexpression, reporter assays, microarray in 3T3/C2C12\",\n      \"pmids\": [\"15664998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding to PPAR\\u03b32 promoter not shown by ChIP in this study\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed a coactivator-displacement mechanism of repression by showing KLF15 blocks P/CAF recruitment to the CTGF promoter, linking it to cardiac fibrosis suppression.\",\n      \"evidence\": \"Adenoviral overexpression, ChIP, EMSA, aortic banding in KLF15-/- mice\",\n      \"pmids\": [\"18586263\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether displacement is direct competition or allosteric not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined a central role in hepatic gluconeogenesis and amino-acid catabolism via PGC-1\\u03b1 coordination, and identified KLF15 protein instability as a node targeted by metformin.\",\n      \"evidence\": \"Liver-specific KO mice, adenoviral rescue, hepatocyte glucose production assays\",\n      \"pmids\": [\"20393151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of metformin-driven KLF15 degradation not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established KLF15 as a circadian metabolic regulator by linking it to rhythmic nitrogen-to-urea detoxification under feeding control.\",\n      \"evidence\": \"Klf15-/- mice, metabolic and circadian profiling, feeding manipulation\",\n      \"pmids\": [\"22405069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct clock-factor inputs to Klf15 not yet defined at this stage\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated a developmental/differentiation role and an anti-hypertrophic cardiac function via direct promoter binding (nephrin/podocin) and repression of MRTF activity.\",\n      \"evidence\": \"ChIP, KLF15-/- podocyte injury models, co-IP with MRTF-A/B, rAAV cardiac overexpression\",\n      \"pmids\": [\"22493483\", \"22586493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MRTF interaction surface not mapped beyond NLS localization\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected KLF15 to nutrient/insulin signaling by showing its deficiency protects from hepatic insulin resistance and alters mTORC1/AMPK/autophagy via amino acid signaling.\",\n      \"evidence\": \"KLF15-/- mice, high-fat diet, ER stress induction, primary hepatocyte signaling analysis\",\n      \"pmids\": [\"24167585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets bridging KLF15 to mTORC1 not enumerated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a fasting-specific lipogenic-repression mechanism: KLF15 assembles with LXR/RXR on Srebf1 and recruits RIP140 over SRC1, switching the promoter to a repressed state.\",\n      \"evidence\": \"ChIP, reporter assays, complex analysis, mouse overexpression\",\n      \"pmids\": [\"27545894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and direct binding partner within the LXR/RXR complex not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established KLF15 as a circadian output node in the heart governing biphasic active/resting transcriptomic oscillation independent of the core clock.\",\n      \"evidence\": \"Cardiomyocyte-specific KLF15 depletion, transcriptome and circadian profiling\",\n      \"pmids\": [\"26686628\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct cardiac target genes driving phase partition not individually validated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed KLF15 localization is dynamically controlled by SUMOylation: hypoxia-driven SENP1 deSUMOylation exports KLF15 from the nucleus, de-repressing Arg2 and altering vascular tone.\",\n      \"evidence\": \"ChIP, subcellular fractionation, SENP1 modulation, isolated artery functional assay\",\n      \"pmids\": [\"29472234\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO acceptor site on KLF15 not mapped in this entry\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified WWP1/NEDD4-mediated K48-linked ubiquitination as the dominant control over KLF15 protein levels, linking its stability to muscle atrophy and cardiac inflammation.\",\n      \"evidence\": \"Muscle- and heart-specific KO mice, WWP1/NEDD4 modulation, K48 ubiquitination co-IP, MI and dexamethasone models\",\n      \"pmids\": [\"30830866\", \"36593958\", \"33687156\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin acceptor lysines on KLF15 not defined\", \"Hierarchy between WWP1 and NEDD4 across tissues unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established KLF15 as a master transcriptional controller of all three phases of hepatic endobiotic/xenobiotic metabolism, governing drug, bile acid, and steroid handling.\",\n      \"evidence\": \"Liver-specific KO, transcriptomics, viral reconstitution, hormone and toxicity assays\",\n      \"pmids\": [\"32694878\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactor requirements for phase I\\u2013III gene activation not dissected\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked KLF15 to human disease by demonstrating a loss-of-function truncation (p.Lys229*) abolishes both its activating and repressive transcriptional activities, causing atrial fibrillation and cardiomyopathy.\",\n      \"evidence\": \"Whole exome sequencing, pedigree analysis, dual-luciferase assays of mutant KLF15 on KChIP2 and CTGF\",\n      \"pmids\": [\"33809104\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single family/lab functional validation\", \"Structural consequence of truncation on zinc fingers not modeled\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined a mechanosensory atrophy pathway in which immobilization lowers cytosolic Ca2+ via Piezo1, inducing KLF15 and IL-6 to drive muscle wasting.\",\n      \"evidence\": \"Ca2+ bioimaging, Piezo1 disruption, muscle-specific KLF15 and IL-6 KO mice, human validation\",\n      \"pmids\": [\"35290243\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional link from KLF15 to Il6 not defined at promoter level\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided genome-wide definition of KLF15 occupancy and a physical PPAR\\u03b4 partnership, plus a direct CBG/corticosteroid-transport program, refining its mechanism as a promoter-enriched activator.\",\n      \"evidence\": \"ChIP-seq cistromes in Klf15-3xFLAG mice, ATAC-seq, co-IP with PPAR\\u03b4, KO and reconstitution\",\n      \"pmids\": [\"35263131\", \"35413288\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of tissue-specific promoter vs distal-enhancer occupancy not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mapped the upstream fasting circuit by showing glucocorticoid receptor and FoxO1/3 directly bind the KLF15 enhancer/promoter, placing KLF15 downstream of the insulin/glucocorticoid axis to switch macronutrient flow.\",\n      \"evidence\": \"GR and FoxO ChIP/binding analysis, KLF15-KO epistasis, fasting experiments\",\n      \"pmids\": [\"37702262\", \"34988390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of GR vs FoxO inputs in different fasting states not quantified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated a regenerative differentiation role in muscle by showing KLF15 directly activates FKBP5 to enable myoblast fusion and repair, with FKBP5 delivery rescuing the KO.\",\n      \"evidence\": \"ChIP, KLF15-KO muscle injury model, transcriptomics, FKBP5 rescue\",\n      \"pmids\": [\"37673339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which FKBP5 promotes fusion downstream of KLF15 not detailed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended KLF15's gene-regulatory roles to reproduction and cancer suppression through direct activation of TWIST2 and LINC00689 programs.\",\n      \"evidence\": \"ChIP-qPCR, RNA-seq, in vivo implantation and tumor proliferation assays\",\n      \"pmids\": [\"38513352\", \"38273088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings\", \"Tissue-specific selection of these targets versus metabolic targets unexplained\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How KLF15 selects activating versus repressive modes and tissue-specific target sets across its diverse programs remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking partner choice (Sp1, C/EBP\\u03b1, LXR/RXR, PPAR\\u03b4) to activate/repress decision\", \"Ubiquitin/SUMO/acetyl acceptor residues largely unmapped\", \"Structural basis of zinc-finger\\u2013promoter recognition not solved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4, 18, 35]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [3, 5, 10, 35]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 12, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [12, 27, 35]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 2, 3, 35]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [7, 13, 18, 31, 37]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [13, 17, 20]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [29, 30, 46]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 10, 25, 39]}\n    ],\n    \"complexes\": [\"KLF15-LXR/RXR-RIP140 corepressor complex on Srebf1 promoter\"],\n    \"partners\": [\"MEF2A\", \"SP1\", \"CEBPA\", \"MRTF-A\", \"PPARD\", \"WWP1\", \"NEDD4\", \"SIRT3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}