{"gene":"KLF4","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":1998,"finding":"hEZF (KLF4) protein binds specifically to CACCC core sequence motifs by gel mobility shift analysis with purified recombinant protein; acts as a transcriptional repressor in co-transfection experiments (6-fold reduction of CACCC reporter); contains a repression domain mapped to amino acids 181–388 and an activation domain at amino acids 91–117, identified by GAL4 fusion experiments.","method":"Gel mobility shift assay with recombinant protein; co-transfection reporter assay; GAL4 domain-fusion mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding assay with purified recombinant protein plus functional reporter assays with domain-deletion mapping in a single rigorous study","pmids":["9422764"],"is_preprint":false},{"year":2000,"finding":"GKLF/KLF4 and Sp1 bind overlapping sites in the keratin 19 promoter; GKLF has higher binding affinity than Sp1; overexpression of GKLF and Sp1 together drives aberrant K19 expression in pancreatic acinar cells, demonstrating functional cooperation between KLF4 and Sp1 in tissue-specific gene regulation.","method":"Co-transfection reporter assay; EMSA; Western blot; immunohistochemistry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — EMSA plus functional reporter and gain-of-function in cells, multiple orthogonal methods in one study","pmids":["10859317"],"is_preprint":false},{"year":2000,"finding":"KLF4 (GKLF) and KLF6 (Zf9) physically interact (co-immunoprecipitation), and their co-transfection additively coactivates the human keratin 4 (K4) promoter in esophageal cancer cell lines, demonstrating a direct protein–protein interaction between two Krüppel-like family members.","method":"Co-transfection reporter assay; co-immunoprecipitation","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal/co-IP plus functional reporter, single lab but two orthogonal methods","pmids":["10802067"],"is_preprint":false},{"year":2002,"finding":"GKLF/KLF4 is induced in vascular smooth muscle cells (VSMCs) by hydroxyl radicals via p38 MAP kinase-, calcium-, and protein-synthesis-dependent pathways; KLF4 overexpression causes growth arrest, increases p21WAF1/Cip1, p27KIP1, and p53 expression, and directly binds the Id3 promoter to suppress Id3 transcription; KLF4 inhibition promotes VSMC proliferation.","method":"Differential display; transfection of sense/antisense constructs; promoter-binding assay; cell count and BrdU assays","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays in one lab including promoter binding, gain/loss of function, signaling pathway dissection","pmids":["12087069"],"is_preprint":false},{"year":2002,"finding":"GKLF/KLF4 binds the bcn-1 element of the laminin gamma1 (LAMC1) promoter and synergistically activates the promoter together with Sp1; the synergism requires the GKLF activation and DNA-binding domains as well as a permissive promoter context.","method":"Yeast one-hybrid screen; EMSA; co-transfection reporter assay with deletion/mutation constructs","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast one-hybrid plus reporter and EMSA, multiple methods in one lab","pmids":["12034813"],"is_preprint":false},{"year":2003,"finding":"TGF-β1 and BMP-2, -4, and -6 each induce KLF4 binding to the TGF-β control element (TCE) in smooth muscle marker gene promoters; KLF4 induction was confirmed by immunocytochemistry and Western blotting, linking TGF-β superfamily signaling to KLF4-mediated regulation of VSMC phenotype.","method":"EMSA; reporter assay; immunocytochemistry; Western blot; pharmacological co-treatment experiments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (EMSA, reporter, protein detection) in a single lab","pmids":["12538588"],"is_preprint":false},{"year":2005,"finding":"KLF4 was identified in a functional genomic screen as bypassing RAS(V12)-induced senescence; in untransformed cells KLF4 inhibits proliferation, an effect bypassed by cyclin-D1; KLF4 directly represses the p53 promoter (transcriptional repressor activity), thereby enabling RAS(V12)-mediated transformation and resistance to DNA-damage-induced apoptosis; KLF4 depletion from breast cancer cells restores p53 levels and causes p53-dependent apoptosis.","method":"Functional genomic screen; reporter assay; chromatin immunoprecipitation; shRNA knockdown; colony transformation assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide screen plus ChIP plus epistasis (rescue by p53 depletion), replicated across multiple cell systems in one rigorous study","pmids":["16244670"],"is_preprint":false},{"year":2007,"finding":"KLF4 (GKLF) overexpression increases p53 promoter activity, mRNA, and protein in VSMCs; the growth arrest induced by KLF4 is completely abolished by co-transfection of p53 antisense, establishing that p53 induction is mechanistically essential for KLF4-mediated VSMC proliferation inhibition.","method":"Luciferase reporter assay; real-time RT-PCR; Western blot; BrdU FACS; co-transfection epistasis","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods plus genetic epistasis (p53 antisense rescue) establishing the pathway order","pmids":["17659301"],"is_preprint":false},{"year":2007,"finding":"KLF4 binds the IL-10 promoter and directly activates IL-10 transcription in LPS-stimulated RAW264.7 macrophages; KLF4 overexpression increases IL-10 mRNA and protein, whereas antisense KLF4 decreases them.","method":"Luciferase reporter assay; EMSA; RT-PCR; ELISA; transfection of sense/antisense constructs","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus reporter plus gain/loss of function in macrophages, single lab multiple methods","pmids":["17719562"],"is_preprint":false},{"year":2008,"finding":"KLF4 is a direct transcriptional target of FOXO transcription factors in B cells; forced KLF4 expression in proliferating B cell blasts causes G1 cell cycle arrest in a manner requiring its DNA-binding and transactivation domains; KLF4 knockdown changes expression of known KLF target genes.","method":"Retroviral overexpression; B-cell-specific Klf4 conditional knockout; cell cycle analysis; domain-deletion mutants; RT-PCR","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO mouse plus domain-deletion mutants and cell cycle analysis, multiple orthogonal methods","pmids":["18375530"],"is_preprint":false},{"year":2008,"finding":"In intestinal epithelial cells, KLF4 expression in the proliferative crypt compartment is negatively regulated by the transcription factors TCF4 and SOX9, downstream effectors of β-catenin/Tcf signaling; KLF4 rises in villus-differentiated cells and in butyrate-induced differentiation independently of cell fate.","method":"In vitro differentiation assays; RT-PCR; Western blot; reporter/co-transfection with dominant negative TCF4/SOX9","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional dissection with dominant-negative factors plus differentiation models, single lab","pmids":["18977346"],"is_preprint":false},{"year":2009,"finding":"KLF4 and PBX1 directly bind the NANOG proximal promoter and an upstream enhancer respectively, activating NANOG transcription in human ESCs; ChIP and EMSA confirmed direct binding; KLF4 cooperates synergistically with OCT4 and SOX2 to transactivate the NANOG promoter; knockdown of KLF4/PBX1 or mutation of their binding sites significantly reduces NANOG promoter activity.","method":"ChIP; EMSA; luciferase reporter assay; knockdown; overexpression; co-transfection","journal":"Stem cells","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ChIP plus EMSA plus reporter plus loss-of-function with binding-site mutation, multiple orthogonal methods establishing direct promoter occupancy and functional consequence","pmids":["19522013"],"is_preprint":false},{"year":2009,"finding":"KLF4 induction in endothelial cells by resveratrol and atheroprotective shear stress occurs via a MEK5/MEF2-dependent signaling pathway; KLF4 and KLF2 share regulation through MEK5 activation and regulate 59.2% of the same MEK5-target genes in endothelial cells.","method":"Pharmacological inhibition; transcriptional profiling; overexpression; pathway activation by constitutively active MEK5","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway epistasis plus genome-wide profiling, single lab with multiple approaches","pmids":["19968965"],"is_preprint":false},{"year":2009,"finding":"Id3 and KLF4 (GKLF) interact to regulate VSMC proliferation: KLF4 overexpression reduces Id3 promoter activity and Id3 expression, and Id3-induced VSMC proliferation is abolished by KLF4 co-transfection; Id3 overexpression decreases p53 protein, while KLF4 (which induces p53) counteracts Id3-driven mitogenesis.","method":"Co-transfection with sense/antisense constructs; luciferase reporter assay; Western blot; cell proliferation assay","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reporter assay plus epistasis by co-transfection, single lab multiple methods","pmids":["19618124"],"is_preprint":false},{"year":2010,"finding":"KLF4 inhibits lung cancer cell invasion by transcriptionally suppressing SPARC expression; ectopic KLF4 markedly represses SPARC mRNA; knockdown of SPARC recapitulates KLF4-induced anti-invasion activity; restoration of SPARC in KLF4-transfected cells abrogates the anti-invasion effect, placing KLF4 upstream of SPARC in the invasion pathway.","method":"Stable transfection; Matrigel invasion assay; gene expression profiling; siRNA knockdown; retroviral SPARC restoration (epistasis)","journal":"Cancer biology & therapy","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (rescue experiment) plus gain/loss of function with defined phenotype (invasion), multiple orthogonal methods","pmids":["20215880"],"is_preprint":false},{"year":2014,"finding":"KLF4 directly binds the LDHA promoter and negatively regulates LDHA transcription; KLF4 overexpression attenuates aerobic glycolysis in pancreatic cancer cells in vitro and in orthotopic mouse models, while KLF4 knockdown has the opposite effect.","method":"ChIP; reporter assay; siRNA knockdown; overexpression; metabolic assays in vitro and in vivo","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ChIP demonstrating direct promoter binding plus functional gain/loss of function in vitro and in vivo with metabolic readout","pmids":["24947925"],"is_preprint":false},{"year":2014,"finding":"KLF4 directly activates NANOG promoter by liquid-liquid phase condensation with DNA; the isolated KLF4 DNA-binding domain undergoes biomolecular condensation with a NANOG proximal promoter fragment, enhanced by CpG methylation of a KLF4 cognate site (established in the 2021 study, see below).","method":"Luciferase reporter assay; ChIP; immunofluorescence; binding site mutation","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods confirming direct binding and functional activation, single lab","pmids":["19522013"],"is_preprint":false},{"year":2014,"finding":"PRMT5 methylates KLF4 at arginine residues, inhibiting VHL-mediated ubiquitylation and proteasomal degradation of KLF4, thereby elevating KLF4 protein levels; elevated KLF4 increases p21 transcription and reduces Bax expression; disruption of PRMT5-mediated KLF4 methylation after genotoxic stress abrogates KLF4 accumulation and attenuates cell cycle arrest.","method":"Co-immunoprecipitation; ubiquitination assay; mutagenesis of methylation sites; structure-based modelling; Western blot; cell cycle analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — biochemical reconstitution of PTM interplay (methylation blocking ubiquitination), mutagenesis, multiple orthogonal methods in one study","pmids":["26420673"],"is_preprint":false},{"year":2014,"finding":"Specific lysine residues in the KLF4 N-terminal domain (Lys32, 52, 232, and 252) are critical for proteasomal ubiquitination and degradation of KLF4 protein; mutation of these residues stabilizes the protein.","method":"Deletion fragment analysis; site-directed mutagenesis; ubiquitination assay; Western blot; bioinformatics prediction","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis of specific lysines combined with ubiquitination assay in one study, single lab","pmids":["24388984"],"is_preprint":false},{"year":2015,"finding":"TRAF7 acts as an E3 ubiquitin ligase that targets KLF4 for ubiquitin-mediated degradation; TRAF7 interacts with the KLF4 N-terminus and promotes KLF4 protein turnover, thereby promoting HCC cell migration and invasion; restoration of KLF4 abrogates TRAF7-induced motility.","method":"Co-immunoprecipitation; ubiquitination assay; gain/loss of function; in vivo tumor models","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP plus ubiquitination assay plus epistasis rescue, single lab","pmids":["31730901"],"is_preprint":false},{"year":2015,"finding":"BAALC traps KLF4 in the cytoplasm, preventing its nuclear function; ERK-mediated monocytic differentiation of AML cells is blocked by BAALC through cytoplasmic sequestration of KLF4, establishing that KLF4 nuclear localization is required for its differentiation-promoting function.","method":"Co-immunoprecipitation; subcellular fractionation; immunofluorescence; MEK inhibitor treatment; gain/loss of function","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular localization experiments with functional consequence (differentiation) plus biochemical interaction, single lab","pmids":["26050649"],"is_preprint":false},{"year":2015,"finding":"p53 and KLF4 directly activate CEBPA gene transcription, establishing a p53-KLF4-CEBPA axis in AML; p53 loss leads to concomitant reduction of KLF4 and CEBPA; restoring p53 function induces CEBPA expression and myeloid differentiation.","method":"Reporter assay for CEBPA promoter; Western blot; pharmacological p53 restoration; AML patient sample analysis","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reporter assay plus epistasis via p53 restoration, single lab","pmids":["26408402"],"is_preprint":false},{"year":2016,"finding":"KLF4 directly represses MSI2 gene transcription in pancreatic cancer cell lines and mouse models of PDAC, establishing a KLF4/MSI2 regulatory pathway; loss of KLF4 results in MSI2 overexpression, which promotes PDAC proliferation, migration, invasion, and metastasis.","method":"ChIP; reporter assay; gain/loss-of-function in vitro and in vivo; molecular biology methods","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter plus functional in vivo experiments, single lab","pmids":["27449499"],"is_preprint":false},{"year":2016,"finding":"KLF4 gene is inactivated by DNA methylation in children with T-ALL; loss of KLF4 accelerates NOTCH1-induced T-ALL by enhancing G1-to-S transition; KLF4 directly represses MAP2K7, and KLF4 loss leads to aberrant activation of MAP2K7, JNK, and ATF2 in leukemic cells; JNK inhibitors reduce leukemia cell expansion.","method":"DNA methylation analysis; conditional Klf4 knockout mice; cell cycle analysis; ChIP/reporter for MAP2K7 repression; JNK inhibitor treatment in PDX models","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse model plus ChIP-based promoter repression plus therapeutic epistasis in PDX, multiple orthogonal methods","pmids":["27872496"],"is_preprint":false},{"year":2017,"finding":"Endothelial-specific double knockout of KLF2 and KLF4 in adult mice causes acute death from myocardial infarction, heart failure, and stroke with profound vascular integrity compromise and dysregulation of the coagulation system; a single allele of either gene is sufficient for survival, establishing absolute requirement for KLF2/4 in endothelial and vascular integrity.","method":"Inducible endothelial-specific conditional double knockout mouse model; histology; coagulation assays","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous in vivo conditional KO with defined lethal vascular phenotype and epistasis between KLF2 and KLF4","pmids":["28239661"],"is_preprint":false},{"year":2017,"finding":"KLF4 expression in perivascular cells promotes a less differentiated state with enhanced ECM (fibronectin) production; genetic inactivation of Klf4 in perivascular cells decreases pre-metastatic niche formation and metastasis; tumor-secreted factors induce perivascular cell phenotypic switching associated with increased KLF4 expression.","method":"Perivascular-cell-specific lineage tracing; conditional Klf4 knockout; in vivo metastasis models; immunostaining","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — lineage tracing plus conditional KO with defined in vivo phenotype (pre-metastatic niche, metastasis)","pmids":["28920957"],"is_preprint":false},{"year":2017,"finding":"β-catenin interacts directly with KLF4 in differentiating (but not proliferating) epithelial cells to promote expression of specialized keratins; WNT10A-dependent KLF4-mediated differentiation is required for normal tissue structure and integrity in palmoplantar and tongue epithelia.","method":"Co-immunoprecipitation; conditional KO mice (Wnt10a and Klf4 mutants); keratin expression analysis; histology","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus genetic mouse models with defined differentiation phenotype, multiple orthogonal methods","pmids":["28589954"],"is_preprint":false},{"year":2018,"finding":"KLF4 nuclear export requires ERK activation; ERK phosphorylates KLF4 at S132, triggering interaction with nuclear export factor XPO1 and KLF4 cytoplasmic relocalization; mutation of S132 blocks nuclear export, prevents decline in Nanog/Klf4/Sox2 mRNA, and blocks ESC differentiation, establishing KLF4 relocalization as the first step in exit from naive pluripotency.","method":"Live imaging; subcellular fractionation; co-immunoprecipitation with XPO1; site-directed mutagenesis (S132A); ERK inhibitors; differentiation assays","journal":"Stem cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of phosphosite plus biochemical interaction with XPO1 plus localization imaging plus functional differentiation block, multiple orthogonal methods","pmids":["29526737"],"is_preprint":false},{"year":2018,"finding":"Klf4 polyglutamylation at Glu381 by TTLL4 and TTLL1 during cell reprogramming impedes K48-linked ubiquitination and sustains KLF4 protein stability; CCP1 or CCP6 (deglutamylases) deficiency promotes iPSC induction; Klf4-E381A knockin mice show impaired blastocyst development and embryonic lethality; deletion of TTLL4 or TTLL1 abrogates reprogramming.","method":"Site-directed mutagenesis (Glu381Ala knockin mouse); ubiquitination assays; polyglutamylation assays; iPSC reprogramming efficiency; embryo phenotyping","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — knockin mouse with defined embryonic lethality, biochemical PTM cross-talk (glutamylation/ubiquitination) mapped to specific residue, replicated across systems","pmids":["29593216"],"is_preprint":false},{"year":2018,"finding":"DDX3X directly interacts with KLF4 mRNA and regulates its splicing; DDX3X depletion in MCF7 cells induces G1 arrest by relieving DDX3X-mediated inhibition of KLF4 expression; KLF4 represses S-phase inducing genes downstream of DDX3X.","method":"RNA immunoprecipitation; splicing assay; siRNA knockdown; cell cycle analysis; Western blot","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — RNA-IP plus functional knockdown with cell cycle readout, single lab","pmids":["29782654"],"is_preprint":false},{"year":2019,"finding":"KLF4 protein stability in embryonic stem cells is maintained through direct interaction with pluripotency transcription factors NANOG, SOX2, and STAT3, which facilitate KLF4 association with RNA Pol II; KLF4 half-life exceeds 24 h in pluripotent cells but drops to <2 h during differentiation; posttranslational modification of KLF4 destabilizes the protein as cells exit pluripotency; mutations preventing this destabilization block differentiation.","method":"Homozygous enhancer deletion; protein half-life measurements (cycloheximide chase); co-immunoprecipitation with NANOG/SOX2/STAT3/Pol II; site-directed mutagenesis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — protein stability measurements plus reciprocal Co-IP plus functional mutagenesis preventing differentiation, multiple orthogonal methods","pmids":["31221664"],"is_preprint":false},{"year":2019,"finding":"PLK1 (polo-like kinase 1) directly phosphorylates KLF4 at Ser234, causing recruitment of E3 ligase TRAF6 which mediates K63-linked ubiquitination that stabilizes KLF4 protein; KLF4 in turn enhances TRAF6 expression transcriptionally, forming a KLF4-TRAF6 feed-forward loop that promotes tumorigenesis in nasopharyngeal carcinoma.","method":"Kinase inhibitor screening; in vitro kinase assay; co-immunoprecipitation; ubiquitination assay; site-directed mutagenesis; xenograft mouse model","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay mapping phosphosite plus Co-IP of E3 ligase recruitment plus ubiquitination assay, multiple orthogonal methods","pmids":["31281496"],"is_preprint":false},{"year":2019,"finding":"USP10 is a deubiquitinating enzyme for KLF4; USP10 overexpression increases KLF4 protein level by blocking proteasomal degradation; USP10 loss promotes KLF4 degradation and accelerates KrasG12D-driven lung adenocarcinoma; KLF4 facilitates transcription of tumor suppressor TIMP3 by directly binding the TIMP3 promoter.","method":"DUB library screen; co-immunoprecipitation; ubiquitination assay; KO mouse (USP10); ChIP; xenograft","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical DUB screen plus Co-IP plus ubiquitination assay plus in vivo KO mouse model, multiple orthogonal methods","pmids":["31748695"],"is_preprint":false},{"year":2019,"finding":"ATXN3 is a deubiquitinating enzyme for KLF4; ATXN3 binds KLF4 (confirmed by co-immunoprecipitation), mediates KLF4 deubiquitination and protein stabilization, and promotes breast cancer metastasis in a KLF4-dependent manner.","method":"DUB library screen (65 enzymes); co-immunoprecipitation; ubiquitination assay; in vitro/in vivo metastasis assays","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — DUB screen plus Co-IP plus functional epistasis, single lab","pmids":["31563563"],"is_preprint":false},{"year":2019,"finding":"KLF4 represses the Dyrk2 gene in CML leukemic stem/progenitor cells; loss of KLF4 elevates DYRK2, which depletes c-Myc protein and activates p53, inhibiting survival and self-renewal; KLF4 deletion severely abrogates BCR-ABL1+ CML maintenance in vivo.","method":"Conditional Klf4 gene deletion; gene expression analysis; ChIP (inferred); pharmacological DYRK2 stabilization; murine and human CML stem cell assays","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO mouse plus mechanistic pathway placement (KLF4→Dyrk2→c-Myc/p53), single lab with multiple methods","pmids":["31515251"],"is_preprint":false},{"year":2019,"finding":"DDX17 physically associates with KLF4 via KLF4's zinc-finger domain (confirmed by Co-IP and GST-pull down); DDX17 inhibits KLF4 transcriptional activity at target gene promoters (including E-cadherin and MMP2) and blocks KLF4 binding to the MMP2 promoter; DDX17 cannot regulate KLF4 target genes when the KLF4 zinc-finger domain is deleted.","method":"Co-immunoprecipitation; GST-pull down; ChIP; reporter assay; KLF4 knockdown epistasis","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — GST-pulldown plus Co-IP plus ChIP plus domain deletion plus epistasis, multiple orthogonal methods identifying the interaction surface","pmids":["31653828"],"is_preprint":false},{"year":2019,"finding":"KLF4 macrophage-specific deletion augments M1 polarization of kidney-infiltrating macrophages, exacerbates glomerular matrix deposition, tubular damage, and kidney fibrosis; this is mediated by KLF4's suppression of TNFα in macrophages, and TNF receptor-1 inhibition abrogates differences between KLF4-deficient and wild-type mice.","method":"Conditional myeloid-specific Klf4 and TNFα knockout mice; nephrotoxic serum nephritis and UUO models; histology; TNF receptor-1 inhibitor treatment (epistasis)","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional myeloid KO mouse with defined phenotype plus pharmacological epistasis, replicated in two CKD models","pmids":["31337692"],"is_preprint":false},{"year":2019,"finding":"Sox2 and Klf4 function as the reprogramming core in the absence of exogenous Oct4; polycistronic Sox2 and Klf4 cooperatively bind across the genome, leading to epigenetic remodeling of pluripotency genes and gradual activation of the pluripotency network; stoichiometry of Sox2 and Klf4 is essential for efficiency.","method":"Polycistronic expression without Oct4; ChIP-seq; ATAC-seq/epigenetic profiling; iPSC reprogramming efficiency assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide ChIP-seq plus functional reprogramming with defined stoichiometry requirements, multiple orthogonal methods","pmids":["31722212"],"is_preprint":false},{"year":2021,"finding":"KLF4 DNA-binding domain undergoes liquid-liquid phase condensation (LLPS) with a DNA fragment from the NANOG proximal promoter even in the absence of an intrinsically disordered region; CpG methylation of a KLF4 cognate binding site enhances condensate formation, proposing condensation-based chromatin re-organization.","method":"In vitro LLPS assay; fluorescence microscopy; biophysical characterization of condensate properties; methylated vs. unmethylated DNA comparison","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of LLPS with purified protein and defined DNA, biophysical validation; single lab","pmids":["34552088"],"is_preprint":false},{"year":2021,"finding":"KLF4 KO in PDGFR-β+ mesenchymal cells upregulates TGFβ signaling and promotes fibrosis; in α-SMA+ myofibroblasts, KLF4 reduction non-cell-autonomously exacerbates lung fibrosis via a FOXM1→CCL2/CCR2 pathway inducing macrophage accumulation, demonstrating opposing context-dependent roles of KLF4 in distinct mesenchymal cell types.","method":"Cell-type-specific conditional Klf4 knockout; bleomycin lung fibrosis model; transcriptomic analysis; FOXM1/CCL2 pathway analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO in two mesenchymal compartments with defined opposing phenotypes, in vivo model","pmids":["34893592"],"is_preprint":false},{"year":2021,"finding":"USP11 deubiquitinates KLF4 by removing K63-linked polyubiquitin chains, thereby destabilizing and degrading KLF4 protein; USP11 interacts with KLF4 (identified by proteomics and confirmed by Co-IP); USP11 depletion inhibits HCC growth by enhancing KLF4 stability.","method":"Proteomic approach; co-immunoprecipitation; deubiquitination assay (K63-ubiquitin chain removal); USP11 knockout; in vitro HCC functional assays","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus deubiquitination assay specifying chain type, single lab","pmids":["34114341"],"is_preprint":false},{"year":2017,"finding":"KLF4 binds to methylated CpG (mCpG) sites in cis-regulatory elements and promotes chromatin remodeling and transcriptional activation of 116 genes in a methylation-dependent manner in glioblastoma cells; R458A mutation in the KLF4 zinc-finger domain abolishes mCpG-dependent binding and abrogates KLF4-promoted cell adhesion, migration, and morphological changes.","method":"ChIP-seq; ATAC-seq; luciferase reporter; site-directed mutagenesis (R458A); cell adhesion/migration assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide ChIP-seq plus functional mutagenesis with defined phenotypic rescue, multiple orthogonal methods","pmids":["28553926"],"is_preprint":false},{"year":2017,"finding":"PARP1 interacts with KLF4 and is required for KLF4 recruitment to the TERT promoter; PARP1 knockdown reduces TERT expression and telomerase activity in cancer and ESCs; the oligo(ADP-ribose) but not poly(ADP-ribose) polymerase activity of PARP1 is required for KLF4-TERT activation.","method":"Co-immunoprecipitation; ChIP; PARP1 knockdown; TERT reporter assay; enzymatic activity mutants of PARP1; telomerase activity assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP plus ChIP establishing direct co-occupancy, enzymatic domain requirement mapped, multiple orthogonal methods","pmids":["28985359"],"is_preprint":false},{"year":2016,"finding":"KLF4 directly binds the NDRG2 promoter and transcriptionally activates NDRG2; KLF4-mediated inhibition of colorectal cancer cell proliferation is dependent on NDRG2 (rescued by NDRG2 knockdown); KLF4 also upregulates p21WAF1/Cip1 and downregulates cyclin D1.","method":"ChIP; luciferase reporter; siRNA knockdown; MTT/EdU/colony assays; xenograft mouse model","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter plus functional epistasis (NDRG2 knockdown rescuing KLF4 effects), single lab","pmids":["28656310"],"is_preprint":false},{"year":2019,"finding":"KLF4 promotes self-renewal in CML leukemic stem cells by transcriptionally repressing Dyrk2; KLF4 also promotes transcription of TERT (in cancer/ESC context via PARP1 partnership) and represses hTERT in lung cancer cells by directly binding the hTERT promoter.","method":"ChIP; luciferase reporter; gain/loss of function in lung cancer cells and mouse models","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter plus in vivo mouse model, single lab (note: contradictory directionality with other KLF4/TERT papers; lower confidence assigned)","pmids":["27153563"],"is_preprint":false},{"year":2022,"finding":"KLF4 directly binds the TERT promoter in alveolar epithelial cells and positively regulates TERT expression and telomerase activity; siRNA-mediated KLF4 knockdown reduces TERT and telomerase activity, while overexpression increases both; KLF4 overexpression via AAV-6 suppresses bleomycin-induced pulmonary fibrosis.","method":"ChIP; siRNA knockdown; KLF4 overexpression via AAV-6; TERT reporter; telomerase activity assay; in vivo bleomycin model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirming direct binding plus in vivo rescue, single lab; contradicts lung cancer KLF4/hTERT repression data","pmids":["35508454"],"is_preprint":false},{"year":2022,"finding":"SENP1 is a SUMO-specific protease that de-SUMOylates KLF4; the SENP1-KLF4 axis regulates LPS-induced M1 macrophage polarization via NF-κB signaling; SUMOylated KLF4 promotes M2 polarization whereas de-SUMOylation (by SENP1) shifts macrophages toward M1.","method":"Co-immunoprecipitation; SUMO assay; SENP1 knockdown/overexpression; NF-κB reporter; macrophage polarization markers","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus SUMOylation assay plus functional polarization readout, single lab","pmids":["35942612"],"is_preprint":false},{"year":2022,"finding":"GCN5 interacts with KLF4 and is recruited to the VEGFA promoter at KLF4-binding sites; GCN5 succinylates H3K79 to epigenetically activate VEGFA transcription and succinylates KLF4 itself (activated by ERK signaling) to increase its transcriptional activity, establishing a KLF4-VEGFA positive feedback loop in endometrial angiogenesis.","method":"Co-immunoprecipitation; ChIP; luciferase reporter; succinylation assay; ERK inhibition; siRNA knockdown","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP plus novel PTM (succinylation), single lab with multiple methods","pmids":["35733790"],"is_preprint":false},{"year":2022,"finding":"KLF4 directly binds Caspase-1 and Caspase-3 promoters to activate their transcription in renal tubular epithelial cells, promoting pyroptosis; tubular epithelial cell-specific Klf4 knockout alleviates UUO-induced pyroptosis and renal fibrosis; USP11 deubiquitinates and stabilizes KLF4 in this context, and USP11 KO or inhibitor treatment reduces KLF4 levels and fibrosis.","method":"Tubular-specific Klf4 KO mice; ChIP for Caspase-1/3 promoters; USP11 KO; mitoxantrone (USP11 inhibitor) treatment; co-immunoprecipitation; Western blot; histology","journal":"Acta pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO plus ChIP for direct promoter binding plus pharmacological epistasis, single lab","pmids":["39147900"],"is_preprint":false},{"year":2022,"finding":"KLF4 directly binds the BMP4 promoter and activates BMP4 transcription (confirmed by ChIP); KLF4 overexpression inhibits fibroblast-to-myofibroblast transdifferentiation in hypertrophic scars in vitro and in vivo, dependent on BMP4 induction.","method":"ChIP; reporter assay; KLF4 transfection in vivo and in vitro; myofibroblast differentiation markers","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirming binding plus functional gain-of-function, single lab","pmids":["35637963"],"is_preprint":false},{"year":2023,"finding":"KLF4 directly binds the PLAC8 promoter and negatively regulates PLAC8 transcription in lung cancer cells (confirmed by ChIP and luciferase reporter); overexpression of PLAC8 partially rescues the growth inhibition caused by KLF4, establishing KLF4/PLAC8 as a functional axis in lung cancer.","method":"ChIP; luciferase reporter; KLF4 overexpression; PLAC8 rescue experiment; xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter plus functional epistasis, single lab","pmids":["29789534"],"is_preprint":false},{"year":2024,"finding":"KLF4 regulates nuclear translocation of PRMT6 and thereby suppresses H3R2ME2a levels in trophoblast cells; KLF4 forms a KLF4/PRMT6/H3R2ME2a axis that inhibits trophoblast invasion and migration; ChIP confirmed KLF4 binding to PRMT6 promoter; subcellular fractionation showed KLF4 regulates PRMT6 nuclear localization.","method":"ChIP; subcellular fractionation; immunofluorescence; H3R2me2a epigenetic profiling; trophoblast invasion/migration assays; in vivo miscarriage mouse model","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus subcellular localization plus in vivo model, single lab","pmids":["39390495"],"is_preprint":false},{"year":2023,"finding":"In proliferating myoblasts, KLF4 inhibits proliferation by directly binding the P57 (CDKN1C) promoter to activate P57 transcription, causing cell cycle arrest; in differentiating myoblasts, KLF4 promotes fusion by transcriptionally activating Myomixer; muscle-specific KLF4 knockout impairs muscle formation, physical activity, and regeneration.","method":"Muscle-specific Klf4 KO mice; ChIP for P57 and Myomixer promoters; reporter assays; gain/loss-of-function in myoblasts; cell cycle analysis; fusion assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse with defined phenotype plus ChIP establishing direct target genes in two distinct cellular contexts, multiple orthogonal methods","pmids":["37723138"],"is_preprint":false},{"year":2025,"finding":"KLF4 expression in pre-DC2 progenitors determines the DC2B (CD7-CD11bhi) lineage; Klf4-specific fate-mapping shows KLF4 separates conventional DC from plasmacytoid DC lineage; conditional Klf4 KO eliminates DC2B subset.","method":"Single-cell RNA sequencing; conditional KO; transcription factor fate-mapping; adoptive transfer","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO plus lineage-tracing and single-cell sequencing establishing KLF4 as the transcriptional determinant of DC2B lineage identity","pmids":["40702338"],"is_preprint":false},{"year":2023,"finding":"KLF4 promotes M2 macrophage polarization and mitophagy (upregulating PINK1, Parkin, Bnip3, P62, LC3) in kidney inflammation; silencing KLF4 or mitophagy inhibitor Mdivi-1 reverses paeoniflorin-induced M2 polarization and mitophagy, placing KLF4 upstream of mitophagy in macrophage polarization.","method":"siRNA knockdown; pharmacological inhibition (Mdivi-1); mitochondrial membrane potential assay; ROS measurement; macrophage polarization markers; Western blot","journal":"Phytomedicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single main method (siRNA + inhibitor), indirect epistasis, no direct KLF4 promoter binding for mitophagy genes demonstrated","pmids":["37247587"],"is_preprint":false},{"year":2014,"finding":"KLF4 directly binds the TERT (hTERT) promoter in ESCs and cancer cells; PARP1 is required for this recruitment and for telomerase activity maintenance; knockdown of PARP1 reduces KLF4 binding to TERT promoter.","method":"ChIP; co-immunoprecipitation; PARP1 knockdown; telomerase activity assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus Co-IP plus functional knockdown, single lab","pmids":["28985359"],"is_preprint":false},{"year":2023,"finding":"Trained alveolar macrophages upregulate KLF4, which in turn mediates increased MERTK expression; KLF4-driven MERTK upregulation enhances efferocytosis and injury resolution; single-cell mass cytometry and lineage tracing identified expansion of a MERTKhi proresolving AM subset associated with KLF4 expression.","method":"Transcriptomic analysis; CyTOF mass cytometry; lineage tracing; KLF4 knockdown; adoptive transfer experiments","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional transcriptomic plus lineage tracing plus adoptive transfer, single lab; indirect KLF4→MERTK link without ChIP","pmids":["37615937"],"is_preprint":false}],"current_model":"KLF4 is a zinc-finger transcription factor that binds CACCC/GC-rich promoter motifs and contains separable activation (aa 91–117) and repression (aa 181–388) domains; it directly represses p53 transcription in cancer contexts while inducing p53 in VSMCs to block proliferation, and it transcriptionally activates or represses a broad set of target genes (NANOG, LDHA, TERT, p21, MAP2K7, MSI2, SPARC, PLAC8, NDRG2, BMP4, IL-10, CXCL8) depending on cellular context; its protein stability and activity are regulated by a network of post-translational modifications including PRMT5-mediated arginine methylation (which blocks VHL-mediated ubiquitination), TTLL4/TTLL1-mediated polyglutamylation (which blocks K48-ubiquitination), PLK1 phosphorylation at Ser234 (recruiting TRAF6 for K63-ubiquitination/stabilization), ERK phosphorylation at Ser132 (triggering XPO1-mediated nuclear export and initiation of ESC differentiation), and deubiquitination by USP10, USP11, ATXN3, and DUB3; in pluripotent cells KLF4 protein stability is maintained through direct interaction with NANOG, SOX2, and STAT3 that facilitate association with RNA Pol II, while Sox2-Klf4 cooperation drives genome-wide epigenetic remodeling during reprogramming; KLF4 can also form liquid-liquid condensates with methylated DNA through its DNA-binding domain to organize chromatin; in the immune system KLF4 controls macrophage M1/M2 polarization (regulated by SENP1-mediated de-SUMOylation affecting NF-κB) and determines DC2B dendritic cell lineage identity; in vascular biology KLF4 together with KLF2 is absolutely required for endothelial integrity and vascular homeostasis in adult animals."},"narrative":{"mechanistic_narrative":"KLF4 is a zinc-finger transcription factor that binds CACCC/GC-rich and methylated-CpG motifs to control cell proliferation, differentiation, and lineage identity across epithelial, vascular, hematopoietic, and pluripotent contexts [PMID:9422764, PMID:28553926]. It contains separable functional modules—an activation domain (aa 91–117) and a repression domain (aa 181–388)—and acts as either activator or repressor depending on cellular context and partner availability [PMID:9422764]. Through direct promoter occupancy it represses targets such as p53 (enabling RAS-driven transformation), LDHA, MSI2, MAP2K7, and SPARC, and activates targets including NANOG, NDRG2, BMP4, IL-10, and CDKN1C/p57, thereby imposing growth arrest in untransformed cells while supporting tumor maintenance in specific malignancies [PMID:16244670, PMID:19522013, PMID:20215880, PMID:24947925, PMID:27449499, PMID:27872496, PMID:28656310]. In pluripotency, KLF4 cooperates synergistically with OCT4 and SOX2 at the NANOG promoter and partners with SOX2 to drive genome-wide epigenetic remodeling during reprogramming [PMID:19522013, PMID:31722212]; its DNA-binding domain forms liquid-liquid condensates with NANOG promoter DNA in a CpG-methylation-enhanced manner, providing a biophysical mode of chromatin organization [PMID:34552088]. KLF4 activity is tightly gated by post-translational modification and trafficking: PRMT5-mediated arginine methylation blocks VHL-dependent ubiquitination [PMID:26420673], TTLL4/TTLL1 polyglutamylation at Glu381 blocks K48-ubiquitination to sustain reprogramming and embryonic viability [PMID:29593216], PLK1 phosphorylation at Ser234 recruits TRAF6 for stabilizing K63-ubiquitination [PMID:31281496], and ERK phosphorylation at Ser132 triggers XPO1-mediated nuclear export that initiates exit from naive pluripotency [PMID:29526737]; a panel of deubiquitinases including USP10 and USP11 further tunes KLF4 protein stability with opposing tumor outcomes [PMID:31748695, PMID:34114341]. In vivo, endothelial KLF4 acts redundantly with KLF2 to maintain vascular integrity [PMID:28239661], and cell-type-specific roles extend to macrophage polarization, dendritic cell DC2B lineage determination, and myogenic differentiation [PMID:35942612, PMID:37723138, PMID:40702338].","teleology":[{"year":1998,"claim":"Established KLF4 as a sequence-specific DNA-binding transcription factor with defined activation and repression modules, answering what kind of molecular activity it carries.","evidence":"Gel mobility shift with recombinant protein plus GAL4 domain-fusion mapping of activation (aa 91–117) and repression (aa 181–388) domains","pmids":["9422764"],"confidence":"High","gaps":["Did not define endogenous target genes","No structural basis for the dual activator/repressor switch"]},{"year":2000,"claim":"Showed KLF4 cooperates with and physically contacts other transcription factors (Sp1, KLF6) at tissue-specific promoters, framing it as a combinatorial regulator rather than a solo factor.","evidence":"EMSA, co-IP, and co-transfection reporter assays at keratin promoters","pmids":["10859317","10802067"],"confidence":"Medium","gaps":["Interaction surfaces not mapped","In vivo relevance of cooperativity not tested"]},{"year":2007,"claim":"Resolved the context-dependence of KLF4–p53 regulation, showing KLF4 represses p53 to enable transformation in cancer cells but induces p53 to arrest VSMC proliferation.","evidence":"Functional genomic screen, ChIP, shRNA, and p53-antisense epistasis across cancer and VSMC systems","pmids":["16244670","17659301"],"confidence":"High","gaps":["What determines activator-versus-repressor outcome at the p53 promoter is unresolved","Cofactors switching directionality not identified"]},{"year":2011,"claim":"Placed KLF4 at the core of the pluripotency transcriptional network by demonstrating direct, cooperative activation of NANOG with OCT4 and SOX2.","evidence":"ChIP, EMSA, reporter assays, and knockdown with binding-site mutation in human ESCs","pmids":["19522013"],"confidence":"High","gaps":["Quantitative contribution relative to other pluripotency factors not defined"]},{"year":2016,"claim":"Expanded KLF4's tumor-suppressive transcriptional program to metabolism, invasion, and stemness regulators, mapping a set of directly bound targets.","evidence":"ChIP, reporter, and rescue/epistasis for SPARC, LDHA, MSI2, NDRG2, MAP2K7 across cancer models in vitro and in vivo","pmids":["20215880","24947925","27449499","28656310","27872496"],"confidence":"High","gaps":["Tissue-specific selection of these targets not explained","Genome-wide occupancy in each tumor type incomplete"]},{"year":2017,"claim":"Defined a methylation-dependent DNA-binding mode, showing KLF4 reads methylated CpG sites to remodel chromatin and activate gene programs.","evidence":"ChIP-seq, ATAC-seq, and R458A zinc-finger mutagenesis with phenotypic rescue in glioblastoma cells","pmids":["28553926"],"confidence":"High","gaps":["How methyl-reading is integrated with unmethylated CACCC binding genome-wide is unclear"]},{"year":2017,"claim":"Established the absolute in vivo requirement for endothelial KLF4/KLF2 in vascular integrity and coagulation homeostasis.","evidence":"Inducible endothelial-specific KLF2/KLF4 double-knockout mice with lethal vascular phenotype and allele-dosage epistasis","pmids":["28239661"],"confidence":"High","gaps":["Direct endothelial target genes driving the phenotype not enumerated","Division of labor between KLF2 and KLF4 unresolved"]},{"year":2018,"claim":"Demonstrated that subcellular localization gates KLF4 function, with ERK-driven S132 phosphorylation and XPO1 export acting as the trigger for exit from naive pluripotency.","evidence":"S132A mutagenesis, XPO1 co-IP, imaging, and differentiation assays in ESCs","pmids":["29526737","26050649"],"confidence":"High","gaps":["Whether nuclear export drives degradation or sequestration generally is context-dependent and not fully separated"]},{"year":2019,"claim":"Built a comprehensive picture of KLF4 protein-stability control through interlocking post-translational modifications and a panel of E3 ligases and deubiquitinases.","evidence":"Co-IP, ubiquitination/methylation/polyglutamylation assays, phosphosite and lysine mutagenesis, knockin and knockout mice (PRMT5, VHL, TTLL4/1, PLK1/TRAF6, USP10, USP11, ATXN3, TRAF7)","pmids":["26420673","24388984","29593216","31281496","31748695","34114341","31563563","31730901"],"confidence":"High","gaps":["The hierarchy and competition among these modifications in a single cell state is not resolved","Stimuli selecting each modification remain partly undefined"]},{"year":2019,"claim":"Showed KLF4 stability in stem cells is maintained by direct interaction with pluripotency factors, coupling its half-life to cell identity.","evidence":"Cycloheximide chase, reciprocal Co-IP with NANOG/SOX2/STAT3/Pol II, and differentiation-blocking mutagenesis","pmids":["31221664","31722212"],"confidence":"High","gaps":["Mechanism linking partner binding to reduced turnover not fully defined"]},{"year":2021,"claim":"Provided a biophysical mechanism for KLF4-mediated chromatin organization via methylation-enhanced liquid-liquid phase condensation of its DNA-binding domain.","evidence":"In vitro LLPS reconstitution with purified DBD and methylated vs. unmethylated NANOG promoter DNA","pmids":["34552088"],"confidence":"High","gaps":["In vivo demonstration of KLF4 condensates at endogenous loci is lacking","Functional consequence of condensation versus simple binding not separated"]},{"year":2022,"claim":"Mapped opposing, cell-type-specific KLF4 functions in tissue fibrosis, inflammation, and immune lineage identity, demonstrating that local context dictates pro- or anti-fibrotic outcomes.","evidence":"Cell-type-specific conditional knockouts in mesenchymal, myeloid, tubular, and DC compartments with defined disease phenotypes and pathway epistasis","pmids":["34893592","31337692","39147900","46","40702338","37723138"],"confidence":"High","gaps":["Upstream signals dictating opposite KLF4 outputs across cell types not unified","Direct versus indirect targets in several compartments incomplete"]},{"year":null,"claim":"It remains unresolved how a single KLF4 protein integrates its modification state, partner availability, and methyl-DNA reading to deterministically choose activation versus repression at a given locus in a given cell type.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking PTM combinatorics to target-gene directionality","Conflicting reports on KLF4-TERT directionality across tissues unreconciled","No genome-wide co-occupancy/condensate map in defined cell states"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,6,11,41]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,41,38]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[20]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[27,20]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[20,27]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[41,38]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,6,11,41]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[6,9,23,52]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[11,30,37,52]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[36,46,53]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,14,23,24]}],"complexes":[],"partners":["SOX2","OCT4","NANOG","PRMT5","TRAF6","USP10","USP11","XPO1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O43474","full_name":"Krueppel-like factor 4","aliases":["Epithelial zinc finger protein EZF","Gut-enriched krueppel-like factor"],"length_aa":513,"mass_kda":54.7,"function":"Transcription factor; can act both as activator and as repressor. Binds the 5'-CACCC-3' core sequence. Binds to the promoter region of its own gene and can activate its own transcription. Regulates the expression of key transcription factors during embryonic development. Plays an important role in maintaining embryonic stem cells, and in preventing their differentiation. Required for establishing the barrier function of the skin and for postnatal maturation and maintenance of the ocular surface. Involved in the differentiation of epithelial cells and may also function in skeletal and kidney development. Contributes to the down-regulation of p53/TP53 transcription","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O43474/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KLF4","classification":"Not Classified","n_dependent_lines":13,"n_total_lines":1208,"dependency_fraction":0.01076158940397351},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KLF4","total_profiled":1310},"omim":[{"mim_id":"621297","title":"LYMPHATIC ENDOTHELIAL TRANSCRIPTIONAL REGULATOR lncRNA 1; LETR1","url":"https://www.omim.org/entry/621297"},{"mim_id":"621257","title":"SPINDLIN INTERACTOR AND REPRESSOR OF CHROMATIN BINDING; SPINDOC","url":"https://www.omim.org/entry/621257"},{"mim_id":"621120","title":"DELTA-LIKE NONCANONICAL NOTCH LIGAND 2; DLK2","url":"https://www.omim.org/entry/621120"},{"mim_id":"620533","title":"LONG INTERGENIC NONCODING RNA 520; LINC00520","url":"https://www.omim.org/entry/620533"},{"mim_id":"615480","title":"BLADDER CANCER-ASSOCIATED TRANSCRIPT 1, NONCODING; BLACAT1","url":"https://www.omim.org/entry/615480"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Microtubules","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skin 1","ntpm":185.8}],"url":"https://www.proteinatlas.org/search/KLF4"},"hgnc":{"alias_symbol":["EZF","GKLF"],"prev_symbol":[]},"alphafold":{"accession":"O43474","domains":[{"cath_id":"3.30.160.60","chopping":"427-458","consensus_level":"medium","plddt":81.0372,"start":427,"end":458},{"cath_id":"3.30.160.60","chopping":"459-513","consensus_level":"medium","plddt":83.9745,"start":459,"end":513}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43474","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43474-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43474-F1-predicted_aligned_error_v6.png","plddt_mean":48.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KLF4","jax_strain_url":"https://www.jax.org/strain/search?query=KLF4"},"sequence":{"accession":"O43474","fasta_url":"https://rest.uniprot.org/uniprotkb/O43474.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43474/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43474"}},"corpus_meta":[{"pmid":"23348505","id":"PMC_23348505","title":"Genomic analysis of non-NF2 meningiomas reveals mutations in TRAF7, KLF4, AKT1, and SMO.","date":"2013","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/23348505","citation_count":721,"is_preprint":false},{"pmid":"16244670","id":"PMC_16244670","title":"The KLF4 tumour suppressor is a transcriptional repressor of p53 that acts as a context-dependent oncogene.","date":"2005","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/16244670","citation_count":488,"is_preprint":false},{"pmid":"16372018","id":"PMC_16372018","title":"KLF4, p21 and context-dependent opposing forces in cancer.","date":"2006","source":"Nature reviews. 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acts as a transcriptional repressor in co-transfection experiments (6-fold reduction of CACCC reporter); contains a repression domain mapped to amino acids 181–388 and an activation domain at amino acids 91–117, identified by GAL4 fusion experiments.\",\n      \"method\": \"Gel mobility shift assay with recombinant protein; co-transfection reporter assay; GAL4 domain-fusion mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding assay with purified recombinant protein plus functional reporter assays with domain-deletion mapping in a single rigorous study\",\n      \"pmids\": [\"9422764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GKLF/KLF4 and Sp1 bind overlapping sites in the keratin 19 promoter; GKLF has higher binding affinity than Sp1; overexpression of GKLF and Sp1 together drives aberrant K19 expression in pancreatic acinar cells, demonstrating functional cooperation between KLF4 and Sp1 in tissue-specific gene regulation.\",\n      \"method\": \"Co-transfection reporter assay; EMSA; Western blot; immunohistochemistry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA plus functional reporter and gain-of-function in cells, multiple orthogonal methods in one study\",\n      \"pmids\": [\"10859317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"KLF4 (GKLF) and KLF6 (Zf9) physically interact (co-immunoprecipitation), and their co-transfection additively coactivates the human keratin 4 (K4) promoter in esophageal cancer cell lines, demonstrating a direct protein–protein interaction between two Krüppel-like family members.\",\n      \"method\": \"Co-transfection reporter assay; co-immunoprecipitation\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal/co-IP plus functional reporter, single lab but two orthogonal methods\",\n      \"pmids\": [\"10802067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GKLF/KLF4 is induced in vascular smooth muscle cells (VSMCs) by hydroxyl radicals via p38 MAP kinase-, calcium-, and protein-synthesis-dependent pathways; KLF4 overexpression causes growth arrest, increases p21WAF1/Cip1, p27KIP1, and p53 expression, and directly binds the Id3 promoter to suppress Id3 transcription; KLF4 inhibition promotes VSMC proliferation.\",\n      \"method\": \"Differential display; transfection of sense/antisense constructs; promoter-binding assay; cell count and BrdU assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays in one lab including promoter binding, gain/loss of function, signaling pathway dissection\",\n      \"pmids\": [\"12087069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GKLF/KLF4 binds the bcn-1 element of the laminin gamma1 (LAMC1) promoter and synergistically activates the promoter together with Sp1; the synergism requires the GKLF activation and DNA-binding domains as well as a permissive promoter context.\",\n      \"method\": \"Yeast one-hybrid screen; EMSA; co-transfection reporter assay with deletion/mutation constructs\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast one-hybrid plus reporter and EMSA, multiple methods in one lab\",\n      \"pmids\": [\"12034813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TGF-β1 and BMP-2, -4, and -6 each induce KLF4 binding to the TGF-β control element (TCE) in smooth muscle marker gene promoters; KLF4 induction was confirmed by immunocytochemistry and Western blotting, linking TGF-β superfamily signaling to KLF4-mediated regulation of VSMC phenotype.\",\n      \"method\": \"EMSA; reporter assay; immunocytochemistry; Western blot; pharmacological co-treatment experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (EMSA, reporter, protein detection) in a single lab\",\n      \"pmids\": [\"12538588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"KLF4 was identified in a functional genomic screen as bypassing RAS(V12)-induced senescence; in untransformed cells KLF4 inhibits proliferation, an effect bypassed by cyclin-D1; KLF4 directly represses the p53 promoter (transcriptional repressor activity), thereby enabling RAS(V12)-mediated transformation and resistance to DNA-damage-induced apoptosis; KLF4 depletion from breast cancer cells restores p53 levels and causes p53-dependent apoptosis.\",\n      \"method\": \"Functional genomic screen; reporter assay; chromatin immunoprecipitation; shRNA knockdown; colony transformation assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide screen plus ChIP plus epistasis (rescue by p53 depletion), replicated across multiple cell systems in one rigorous study\",\n      \"pmids\": [\"16244670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"KLF4 (GKLF) overexpression increases p53 promoter activity, mRNA, and protein in VSMCs; the growth arrest induced by KLF4 is completely abolished by co-transfection of p53 antisense, establishing that p53 induction is mechanistically essential for KLF4-mediated VSMC proliferation inhibition.\",\n      \"method\": \"Luciferase reporter assay; real-time RT-PCR; Western blot; BrdU FACS; co-transfection epistasis\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods plus genetic epistasis (p53 antisense rescue) establishing the pathway order\",\n      \"pmids\": [\"17659301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"KLF4 binds the IL-10 promoter and directly activates IL-10 transcription in LPS-stimulated RAW264.7 macrophages; KLF4 overexpression increases IL-10 mRNA and protein, whereas antisense KLF4 decreases them.\",\n      \"method\": \"Luciferase reporter assay; EMSA; RT-PCR; ELISA; transfection of sense/antisense constructs\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus reporter plus gain/loss of function in macrophages, single lab multiple methods\",\n      \"pmids\": [\"17719562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"KLF4 is a direct transcriptional target of FOXO transcription factors in B cells; forced KLF4 expression in proliferating B cell blasts causes G1 cell cycle arrest in a manner requiring its DNA-binding and transactivation domains; KLF4 knockdown changes expression of known KLF target genes.\",\n      \"method\": \"Retroviral overexpression; B-cell-specific Klf4 conditional knockout; cell cycle analysis; domain-deletion mutants; RT-PCR\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO mouse plus domain-deletion mutants and cell cycle analysis, multiple orthogonal methods\",\n      \"pmids\": [\"18375530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In intestinal epithelial cells, KLF4 expression in the proliferative crypt compartment is negatively regulated by the transcription factors TCF4 and SOX9, downstream effectors of β-catenin/Tcf signaling; KLF4 rises in villus-differentiated cells and in butyrate-induced differentiation independently of cell fate.\",\n      \"method\": \"In vitro differentiation assays; RT-PCR; Western blot; reporter/co-transfection with dominant negative TCF4/SOX9\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional dissection with dominant-negative factors plus differentiation models, single lab\",\n      \"pmids\": [\"18977346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"KLF4 and PBX1 directly bind the NANOG proximal promoter and an upstream enhancer respectively, activating NANOG transcription in human ESCs; ChIP and EMSA confirmed direct binding; KLF4 cooperates synergistically with OCT4 and SOX2 to transactivate the NANOG promoter; knockdown of KLF4/PBX1 or mutation of their binding sites significantly reduces NANOG promoter activity.\",\n      \"method\": \"ChIP; EMSA; luciferase reporter assay; knockdown; overexpression; co-transfection\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ChIP plus EMSA plus reporter plus loss-of-function with binding-site mutation, multiple orthogonal methods establishing direct promoter occupancy and functional consequence\",\n      \"pmids\": [\"19522013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"KLF4 induction in endothelial cells by resveratrol and atheroprotective shear stress occurs via a MEK5/MEF2-dependent signaling pathway; KLF4 and KLF2 share regulation through MEK5 activation and regulate 59.2% of the same MEK5-target genes in endothelial cells.\",\n      \"method\": \"Pharmacological inhibition; transcriptional profiling; overexpression; pathway activation by constitutively active MEK5\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway epistasis plus genome-wide profiling, single lab with multiple approaches\",\n      \"pmids\": [\"19968965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Id3 and KLF4 (GKLF) interact to regulate VSMC proliferation: KLF4 overexpression reduces Id3 promoter activity and Id3 expression, and Id3-induced VSMC proliferation is abolished by KLF4 co-transfection; Id3 overexpression decreases p53 protein, while KLF4 (which induces p53) counteracts Id3-driven mitogenesis.\",\n      \"method\": \"Co-transfection with sense/antisense constructs; luciferase reporter assay; Western blot; cell proliferation assay\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reporter assay plus epistasis by co-transfection, single lab multiple methods\",\n      \"pmids\": [\"19618124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KLF4 inhibits lung cancer cell invasion by transcriptionally suppressing SPARC expression; ectopic KLF4 markedly represses SPARC mRNA; knockdown of SPARC recapitulates KLF4-induced anti-invasion activity; restoration of SPARC in KLF4-transfected cells abrogates the anti-invasion effect, placing KLF4 upstream of SPARC in the invasion pathway.\",\n      \"method\": \"Stable transfection; Matrigel invasion assay; gene expression profiling; siRNA knockdown; retroviral SPARC restoration (epistasis)\",\n      \"journal\": \"Cancer biology & therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (rescue experiment) plus gain/loss of function with defined phenotype (invasion), multiple orthogonal methods\",\n      \"pmids\": [\"20215880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KLF4 directly binds the LDHA promoter and negatively regulates LDHA transcription; KLF4 overexpression attenuates aerobic glycolysis in pancreatic cancer cells in vitro and in orthotopic mouse models, while KLF4 knockdown has the opposite effect.\",\n      \"method\": \"ChIP; reporter assay; siRNA knockdown; overexpression; metabolic assays in vitro and in vivo\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ChIP demonstrating direct promoter binding plus functional gain/loss of function in vitro and in vivo with metabolic readout\",\n      \"pmids\": [\"24947925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KLF4 directly activates NANOG promoter by liquid-liquid phase condensation with DNA; the isolated KLF4 DNA-binding domain undergoes biomolecular condensation with a NANOG proximal promoter fragment, enhanced by CpG methylation of a KLF4 cognate site (established in the 2021 study, see below).\",\n      \"method\": \"Luciferase reporter assay; ChIP; immunofluorescence; binding site mutation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods confirming direct binding and functional activation, single lab\",\n      \"pmids\": [\"19522013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PRMT5 methylates KLF4 at arginine residues, inhibiting VHL-mediated ubiquitylation and proteasomal degradation of KLF4, thereby elevating KLF4 protein levels; elevated KLF4 increases p21 transcription and reduces Bax expression; disruption of PRMT5-mediated KLF4 methylation after genotoxic stress abrogates KLF4 accumulation and attenuates cell cycle arrest.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; mutagenesis of methylation sites; structure-based modelling; Western blot; cell cycle analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — biochemical reconstitution of PTM interplay (methylation blocking ubiquitination), mutagenesis, multiple orthogonal methods in one study\",\n      \"pmids\": [\"26420673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Specific lysine residues in the KLF4 N-terminal domain (Lys32, 52, 232, and 252) are critical for proteasomal ubiquitination and degradation of KLF4 protein; mutation of these residues stabilizes the protein.\",\n      \"method\": \"Deletion fragment analysis; site-directed mutagenesis; ubiquitination assay; Western blot; bioinformatics prediction\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis of specific lysines combined with ubiquitination assay in one study, single lab\",\n      \"pmids\": [\"24388984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRAF7 acts as an E3 ubiquitin ligase that targets KLF4 for ubiquitin-mediated degradation; TRAF7 interacts with the KLF4 N-terminus and promotes KLF4 protein turnover, thereby promoting HCC cell migration and invasion; restoration of KLF4 abrogates TRAF7-induced motility.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay; gain/loss of function; in vivo tumor models\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP plus ubiquitination assay plus epistasis rescue, single lab\",\n      \"pmids\": [\"31730901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BAALC traps KLF4 in the cytoplasm, preventing its nuclear function; ERK-mediated monocytic differentiation of AML cells is blocked by BAALC through cytoplasmic sequestration of KLF4, establishing that KLF4 nuclear localization is required for its differentiation-promoting function.\",\n      \"method\": \"Co-immunoprecipitation; subcellular fractionation; immunofluorescence; MEK inhibitor treatment; gain/loss of function\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular localization experiments with functional consequence (differentiation) plus biochemical interaction, single lab\",\n      \"pmids\": [\"26050649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"p53 and KLF4 directly activate CEBPA gene transcription, establishing a p53-KLF4-CEBPA axis in AML; p53 loss leads to concomitant reduction of KLF4 and CEBPA; restoring p53 function induces CEBPA expression and myeloid differentiation.\",\n      \"method\": \"Reporter assay for CEBPA promoter; Western blot; pharmacological p53 restoration; AML patient sample analysis\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reporter assay plus epistasis via p53 restoration, single lab\",\n      \"pmids\": [\"26408402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KLF4 directly represses MSI2 gene transcription in pancreatic cancer cell lines and mouse models of PDAC, establishing a KLF4/MSI2 regulatory pathway; loss of KLF4 results in MSI2 overexpression, which promotes PDAC proliferation, migration, invasion, and metastasis.\",\n      \"method\": \"ChIP; reporter assay; gain/loss-of-function in vitro and in vivo; molecular biology methods\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter plus functional in vivo experiments, single lab\",\n      \"pmids\": [\"27449499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KLF4 gene is inactivated by DNA methylation in children with T-ALL; loss of KLF4 accelerates NOTCH1-induced T-ALL by enhancing G1-to-S transition; KLF4 directly represses MAP2K7, and KLF4 loss leads to aberrant activation of MAP2K7, JNK, and ATF2 in leukemic cells; JNK inhibitors reduce leukemia cell expansion.\",\n      \"method\": \"DNA methylation analysis; conditional Klf4 knockout mice; cell cycle analysis; ChIP/reporter for MAP2K7 repression; JNK inhibitor treatment in PDX models\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse model plus ChIP-based promoter repression plus therapeutic epistasis in PDX, multiple orthogonal methods\",\n      \"pmids\": [\"27872496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Endothelial-specific double knockout of KLF2 and KLF4 in adult mice causes acute death from myocardial infarction, heart failure, and stroke with profound vascular integrity compromise and dysregulation of the coagulation system; a single allele of either gene is sufficient for survival, establishing absolute requirement for KLF2/4 in endothelial and vascular integrity.\",\n      \"method\": \"Inducible endothelial-specific conditional double knockout mouse model; histology; coagulation assays\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous in vivo conditional KO with defined lethal vascular phenotype and epistasis between KLF2 and KLF4\",\n      \"pmids\": [\"28239661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KLF4 expression in perivascular cells promotes a less differentiated state with enhanced ECM (fibronectin) production; genetic inactivation of Klf4 in perivascular cells decreases pre-metastatic niche formation and metastasis; tumor-secreted factors induce perivascular cell phenotypic switching associated with increased KLF4 expression.\",\n      \"method\": \"Perivascular-cell-specific lineage tracing; conditional Klf4 knockout; in vivo metastasis models; immunostaining\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — lineage tracing plus conditional KO with defined in vivo phenotype (pre-metastatic niche, metastasis)\",\n      \"pmids\": [\"28920957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"β-catenin interacts directly with KLF4 in differentiating (but not proliferating) epithelial cells to promote expression of specialized keratins; WNT10A-dependent KLF4-mediated differentiation is required for normal tissue structure and integrity in palmoplantar and tongue epithelia.\",\n      \"method\": \"Co-immunoprecipitation; conditional KO mice (Wnt10a and Klf4 mutants); keratin expression analysis; histology\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus genetic mouse models with defined differentiation phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"28589954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"KLF4 nuclear export requires ERK activation; ERK phosphorylates KLF4 at S132, triggering interaction with nuclear export factor XPO1 and KLF4 cytoplasmic relocalization; mutation of S132 blocks nuclear export, prevents decline in Nanog/Klf4/Sox2 mRNA, and blocks ESC differentiation, establishing KLF4 relocalization as the first step in exit from naive pluripotency.\",\n      \"method\": \"Live imaging; subcellular fractionation; co-immunoprecipitation with XPO1; site-directed mutagenesis (S132A); ERK inhibitors; differentiation assays\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of phosphosite plus biochemical interaction with XPO1 plus localization imaging plus functional differentiation block, multiple orthogonal methods\",\n      \"pmids\": [\"29526737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Klf4 polyglutamylation at Glu381 by TTLL4 and TTLL1 during cell reprogramming impedes K48-linked ubiquitination and sustains KLF4 protein stability; CCP1 or CCP6 (deglutamylases) deficiency promotes iPSC induction; Klf4-E381A knockin mice show impaired blastocyst development and embryonic lethality; deletion of TTLL4 or TTLL1 abrogates reprogramming.\",\n      \"method\": \"Site-directed mutagenesis (Glu381Ala knockin mouse); ubiquitination assays; polyglutamylation assays; iPSC reprogramming efficiency; embryo phenotyping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — knockin mouse with defined embryonic lethality, biochemical PTM cross-talk (glutamylation/ubiquitination) mapped to specific residue, replicated across systems\",\n      \"pmids\": [\"29593216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DDX3X directly interacts with KLF4 mRNA and regulates its splicing; DDX3X depletion in MCF7 cells induces G1 arrest by relieving DDX3X-mediated inhibition of KLF4 expression; KLF4 represses S-phase inducing genes downstream of DDX3X.\",\n      \"method\": \"RNA immunoprecipitation; splicing assay; siRNA knockdown; cell cycle analysis; Western blot\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — RNA-IP plus functional knockdown with cell cycle readout, single lab\",\n      \"pmids\": [\"29782654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KLF4 protein stability in embryonic stem cells is maintained through direct interaction with pluripotency transcription factors NANOG, SOX2, and STAT3, which facilitate KLF4 association with RNA Pol II; KLF4 half-life exceeds 24 h in pluripotent cells but drops to <2 h during differentiation; posttranslational modification of KLF4 destabilizes the protein as cells exit pluripotency; mutations preventing this destabilization block differentiation.\",\n      \"method\": \"Homozygous enhancer deletion; protein half-life measurements (cycloheximide chase); co-immunoprecipitation with NANOG/SOX2/STAT3/Pol II; site-directed mutagenesis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — protein stability measurements plus reciprocal Co-IP plus functional mutagenesis preventing differentiation, multiple orthogonal methods\",\n      \"pmids\": [\"31221664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PLK1 (polo-like kinase 1) directly phosphorylates KLF4 at Ser234, causing recruitment of E3 ligase TRAF6 which mediates K63-linked ubiquitination that stabilizes KLF4 protein; KLF4 in turn enhances TRAF6 expression transcriptionally, forming a KLF4-TRAF6 feed-forward loop that promotes tumorigenesis in nasopharyngeal carcinoma.\",\n      \"method\": \"Kinase inhibitor screening; in vitro kinase assay; co-immunoprecipitation; ubiquitination assay; site-directed mutagenesis; xenograft mouse model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay mapping phosphosite plus Co-IP of E3 ligase recruitment plus ubiquitination assay, multiple orthogonal methods\",\n      \"pmids\": [\"31281496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"USP10 is a deubiquitinating enzyme for KLF4; USP10 overexpression increases KLF4 protein level by blocking proteasomal degradation; USP10 loss promotes KLF4 degradation and accelerates KrasG12D-driven lung adenocarcinoma; KLF4 facilitates transcription of tumor suppressor TIMP3 by directly binding the TIMP3 promoter.\",\n      \"method\": \"DUB library screen; co-immunoprecipitation; ubiquitination assay; KO mouse (USP10); ChIP; xenograft\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical DUB screen plus Co-IP plus ubiquitination assay plus in vivo KO mouse model, multiple orthogonal methods\",\n      \"pmids\": [\"31748695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ATXN3 is a deubiquitinating enzyme for KLF4; ATXN3 binds KLF4 (confirmed by co-immunoprecipitation), mediates KLF4 deubiquitination and protein stabilization, and promotes breast cancer metastasis in a KLF4-dependent manner.\",\n      \"method\": \"DUB library screen (65 enzymes); co-immunoprecipitation; ubiquitination assay; in vitro/in vivo metastasis assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — DUB screen plus Co-IP plus functional epistasis, single lab\",\n      \"pmids\": [\"31563563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KLF4 represses the Dyrk2 gene in CML leukemic stem/progenitor cells; loss of KLF4 elevates DYRK2, which depletes c-Myc protein and activates p53, inhibiting survival and self-renewal; KLF4 deletion severely abrogates BCR-ABL1+ CML maintenance in vivo.\",\n      \"method\": \"Conditional Klf4 gene deletion; gene expression analysis; ChIP (inferred); pharmacological DYRK2 stabilization; murine and human CML stem cell assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO mouse plus mechanistic pathway placement (KLF4→Dyrk2→c-Myc/p53), single lab with multiple methods\",\n      \"pmids\": [\"31515251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DDX17 physically associates with KLF4 via KLF4's zinc-finger domain (confirmed by Co-IP and GST-pull down); DDX17 inhibits KLF4 transcriptional activity at target gene promoters (including E-cadherin and MMP2) and blocks KLF4 binding to the MMP2 promoter; DDX17 cannot regulate KLF4 target genes when the KLF4 zinc-finger domain is deleted.\",\n      \"method\": \"Co-immunoprecipitation; GST-pull down; ChIP; reporter assay; KLF4 knockdown epistasis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — GST-pulldown plus Co-IP plus ChIP plus domain deletion plus epistasis, multiple orthogonal methods identifying the interaction surface\",\n      \"pmids\": [\"31653828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KLF4 macrophage-specific deletion augments M1 polarization of kidney-infiltrating macrophages, exacerbates glomerular matrix deposition, tubular damage, and kidney fibrosis; this is mediated by KLF4's suppression of TNFα in macrophages, and TNF receptor-1 inhibition abrogates differences between KLF4-deficient and wild-type mice.\",\n      \"method\": \"Conditional myeloid-specific Klf4 and TNFα knockout mice; nephrotoxic serum nephritis and UUO models; histology; TNF receptor-1 inhibitor treatment (epistasis)\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional myeloid KO mouse with defined phenotype plus pharmacological epistasis, replicated in two CKD models\",\n      \"pmids\": [\"31337692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sox2 and Klf4 function as the reprogramming core in the absence of exogenous Oct4; polycistronic Sox2 and Klf4 cooperatively bind across the genome, leading to epigenetic remodeling of pluripotency genes and gradual activation of the pluripotency network; stoichiometry of Sox2 and Klf4 is essential for efficiency.\",\n      \"method\": \"Polycistronic expression without Oct4; ChIP-seq; ATAC-seq/epigenetic profiling; iPSC reprogramming efficiency assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide ChIP-seq plus functional reprogramming with defined stoichiometry requirements, multiple orthogonal methods\",\n      \"pmids\": [\"31722212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KLF4 DNA-binding domain undergoes liquid-liquid phase condensation (LLPS) with a DNA fragment from the NANOG proximal promoter even in the absence of an intrinsically disordered region; CpG methylation of a KLF4 cognate binding site enhances condensate formation, proposing condensation-based chromatin re-organization.\",\n      \"method\": \"In vitro LLPS assay; fluorescence microscopy; biophysical characterization of condensate properties; methylated vs. unmethylated DNA comparison\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of LLPS with purified protein and defined DNA, biophysical validation; single lab\",\n      \"pmids\": [\"34552088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KLF4 KO in PDGFR-β+ mesenchymal cells upregulates TGFβ signaling and promotes fibrosis; in α-SMA+ myofibroblasts, KLF4 reduction non-cell-autonomously exacerbates lung fibrosis via a FOXM1→CCL2/CCR2 pathway inducing macrophage accumulation, demonstrating opposing context-dependent roles of KLF4 in distinct mesenchymal cell types.\",\n      \"method\": \"Cell-type-specific conditional Klf4 knockout; bleomycin lung fibrosis model; transcriptomic analysis; FOXM1/CCL2 pathway analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO in two mesenchymal compartments with defined opposing phenotypes, in vivo model\",\n      \"pmids\": [\"34893592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP11 deubiquitinates KLF4 by removing K63-linked polyubiquitin chains, thereby destabilizing and degrading KLF4 protein; USP11 interacts with KLF4 (identified by proteomics and confirmed by Co-IP); USP11 depletion inhibits HCC growth by enhancing KLF4 stability.\",\n      \"method\": \"Proteomic approach; co-immunoprecipitation; deubiquitination assay (K63-ubiquitin chain removal); USP11 knockout; in vitro HCC functional assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus deubiquitination assay specifying chain type, single lab\",\n      \"pmids\": [\"34114341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KLF4 binds to methylated CpG (mCpG) sites in cis-regulatory elements and promotes chromatin remodeling and transcriptional activation of 116 genes in a methylation-dependent manner in glioblastoma cells; R458A mutation in the KLF4 zinc-finger domain abolishes mCpG-dependent binding and abrogates KLF4-promoted cell adhesion, migration, and morphological changes.\",\n      \"method\": \"ChIP-seq; ATAC-seq; luciferase reporter; site-directed mutagenesis (R458A); cell adhesion/migration assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide ChIP-seq plus functional mutagenesis with defined phenotypic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"28553926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PARP1 interacts with KLF4 and is required for KLF4 recruitment to the TERT promoter; PARP1 knockdown reduces TERT expression and telomerase activity in cancer and ESCs; the oligo(ADP-ribose) but not poly(ADP-ribose) polymerase activity of PARP1 is required for KLF4-TERT activation.\",\n      \"method\": \"Co-immunoprecipitation; ChIP; PARP1 knockdown; TERT reporter assay; enzymatic activity mutants of PARP1; telomerase activity assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP plus ChIP establishing direct co-occupancy, enzymatic domain requirement mapped, multiple orthogonal methods\",\n      \"pmids\": [\"28985359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KLF4 directly binds the NDRG2 promoter and transcriptionally activates NDRG2; KLF4-mediated inhibition of colorectal cancer cell proliferation is dependent on NDRG2 (rescued by NDRG2 knockdown); KLF4 also upregulates p21WAF1/Cip1 and downregulates cyclin D1.\",\n      \"method\": \"ChIP; luciferase reporter; siRNA knockdown; MTT/EdU/colony assays; xenograft mouse model\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter plus functional epistasis (NDRG2 knockdown rescuing KLF4 effects), single lab\",\n      \"pmids\": [\"28656310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KLF4 promotes self-renewal in CML leukemic stem cells by transcriptionally repressing Dyrk2; KLF4 also promotes transcription of TERT (in cancer/ESC context via PARP1 partnership) and represses hTERT in lung cancer cells by directly binding the hTERT promoter.\",\n      \"method\": \"ChIP; luciferase reporter; gain/loss of function in lung cancer cells and mouse models\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter plus in vivo mouse model, single lab (note: contradictory directionality with other KLF4/TERT papers; lower confidence assigned)\",\n      \"pmids\": [\"27153563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF4 directly binds the TERT promoter in alveolar epithelial cells and positively regulates TERT expression and telomerase activity; siRNA-mediated KLF4 knockdown reduces TERT and telomerase activity, while overexpression increases both; KLF4 overexpression via AAV-6 suppresses bleomycin-induced pulmonary fibrosis.\",\n      \"method\": \"ChIP; siRNA knockdown; KLF4 overexpression via AAV-6; TERT reporter; telomerase activity assay; in vivo bleomycin model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirming direct binding plus in vivo rescue, single lab; contradicts lung cancer KLF4/hTERT repression data\",\n      \"pmids\": [\"35508454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SENP1 is a SUMO-specific protease that de-SUMOylates KLF4; the SENP1-KLF4 axis regulates LPS-induced M1 macrophage polarization via NF-κB signaling; SUMOylated KLF4 promotes M2 polarization whereas de-SUMOylation (by SENP1) shifts macrophages toward M1.\",\n      \"method\": \"Co-immunoprecipitation; SUMO assay; SENP1 knockdown/overexpression; NF-κB reporter; macrophage polarization markers\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus SUMOylation assay plus functional polarization readout, single lab\",\n      \"pmids\": [\"35942612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GCN5 interacts with KLF4 and is recruited to the VEGFA promoter at KLF4-binding sites; GCN5 succinylates H3K79 to epigenetically activate VEGFA transcription and succinylates KLF4 itself (activated by ERK signaling) to increase its transcriptional activity, establishing a KLF4-VEGFA positive feedback loop in endometrial angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation; ChIP; luciferase reporter; succinylation assay; ERK inhibition; siRNA knockdown\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP plus novel PTM (succinylation), single lab with multiple methods\",\n      \"pmids\": [\"35733790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF4 directly binds Caspase-1 and Caspase-3 promoters to activate their transcription in renal tubular epithelial cells, promoting pyroptosis; tubular epithelial cell-specific Klf4 knockout alleviates UUO-induced pyroptosis and renal fibrosis; USP11 deubiquitinates and stabilizes KLF4 in this context, and USP11 KO or inhibitor treatment reduces KLF4 levels and fibrosis.\",\n      \"method\": \"Tubular-specific Klf4 KO mice; ChIP for Caspase-1/3 promoters; USP11 KO; mitoxantrone (USP11 inhibitor) treatment; co-immunoprecipitation; Western blot; histology\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO plus ChIP for direct promoter binding plus pharmacological epistasis, single lab\",\n      \"pmids\": [\"39147900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLF4 directly binds the BMP4 promoter and activates BMP4 transcription (confirmed by ChIP); KLF4 overexpression inhibits fibroblast-to-myofibroblast transdifferentiation in hypertrophic scars in vitro and in vivo, dependent on BMP4 induction.\",\n      \"method\": \"ChIP; reporter assay; KLF4 transfection in vivo and in vitro; myofibroblast differentiation markers\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirming binding plus functional gain-of-function, single lab\",\n      \"pmids\": [\"35637963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KLF4 directly binds the PLAC8 promoter and negatively regulates PLAC8 transcription in lung cancer cells (confirmed by ChIP and luciferase reporter); overexpression of PLAC8 partially rescues the growth inhibition caused by KLF4, establishing KLF4/PLAC8 as a functional axis in lung cancer.\",\n      \"method\": \"ChIP; luciferase reporter; KLF4 overexpression; PLAC8 rescue experiment; xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter plus functional epistasis, single lab\",\n      \"pmids\": [\"29789534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KLF4 regulates nuclear translocation of PRMT6 and thereby suppresses H3R2ME2a levels in trophoblast cells; KLF4 forms a KLF4/PRMT6/H3R2ME2a axis that inhibits trophoblast invasion and migration; ChIP confirmed KLF4 binding to PRMT6 promoter; subcellular fractionation showed KLF4 regulates PRMT6 nuclear localization.\",\n      \"method\": \"ChIP; subcellular fractionation; immunofluorescence; H3R2me2a epigenetic profiling; trophoblast invasion/migration assays; in vivo miscarriage mouse model\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus subcellular localization plus in vivo model, single lab\",\n      \"pmids\": [\"39390495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In proliferating myoblasts, KLF4 inhibits proliferation by directly binding the P57 (CDKN1C) promoter to activate P57 transcription, causing cell cycle arrest; in differentiating myoblasts, KLF4 promotes fusion by transcriptionally activating Myomixer; muscle-specific KLF4 knockout impairs muscle formation, physical activity, and regeneration.\",\n      \"method\": \"Muscle-specific Klf4 KO mice; ChIP for P57 and Myomixer promoters; reporter assays; gain/loss-of-function in myoblasts; cell cycle analysis; fusion assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse with defined phenotype plus ChIP establishing direct target genes in two distinct cellular contexts, multiple orthogonal methods\",\n      \"pmids\": [\"37723138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KLF4 expression in pre-DC2 progenitors determines the DC2B (CD7-CD11bhi) lineage; Klf4-specific fate-mapping shows KLF4 separates conventional DC from plasmacytoid DC lineage; conditional Klf4 KO eliminates DC2B subset.\",\n      \"method\": \"Single-cell RNA sequencing; conditional KO; transcription factor fate-mapping; adoptive transfer\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO plus lineage-tracing and single-cell sequencing establishing KLF4 as the transcriptional determinant of DC2B lineage identity\",\n      \"pmids\": [\"40702338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KLF4 promotes M2 macrophage polarization and mitophagy (upregulating PINK1, Parkin, Bnip3, P62, LC3) in kidney inflammation; silencing KLF4 or mitophagy inhibitor Mdivi-1 reverses paeoniflorin-induced M2 polarization and mitophagy, placing KLF4 upstream of mitophagy in macrophage polarization.\",\n      \"method\": \"siRNA knockdown; pharmacological inhibition (Mdivi-1); mitochondrial membrane potential assay; ROS measurement; macrophage polarization markers; Western blot\",\n      \"journal\": \"Phytomedicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single main method (siRNA + inhibitor), indirect epistasis, no direct KLF4 promoter binding for mitophagy genes demonstrated\",\n      \"pmids\": [\"37247587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KLF4 directly binds the TERT (hTERT) promoter in ESCs and cancer cells; PARP1 is required for this recruitment and for telomerase activity maintenance; knockdown of PARP1 reduces KLF4 binding to TERT promoter.\",\n      \"method\": \"ChIP; co-immunoprecipitation; PARP1 knockdown; telomerase activity assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus Co-IP plus functional knockdown, single lab\",\n      \"pmids\": [\"28985359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Trained alveolar macrophages upregulate KLF4, which in turn mediates increased MERTK expression; KLF4-driven MERTK upregulation enhances efferocytosis and injury resolution; single-cell mass cytometry and lineage tracing identified expansion of a MERTKhi proresolving AM subset associated with KLF4 expression.\",\n      \"method\": \"Transcriptomic analysis; CyTOF mass cytometry; lineage tracing; KLF4 knockdown; adoptive transfer experiments\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional transcriptomic plus lineage tracing plus adoptive transfer, single lab; indirect KLF4→MERTK link without ChIP\",\n      \"pmids\": [\"37615937\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KLF4 is a zinc-finger transcription factor that binds CACCC/GC-rich promoter motifs and contains separable activation (aa 91–117) and repression (aa 181–388) domains; it directly represses p53 transcription in cancer contexts while inducing p53 in VSMCs to block proliferation, and it transcriptionally activates or represses a broad set of target genes (NANOG, LDHA, TERT, p21, MAP2K7, MSI2, SPARC, PLAC8, NDRG2, BMP4, IL-10, CXCL8) depending on cellular context; its protein stability and activity are regulated by a network of post-translational modifications including PRMT5-mediated arginine methylation (which blocks VHL-mediated ubiquitination), TTLL4/TTLL1-mediated polyglutamylation (which blocks K48-ubiquitination), PLK1 phosphorylation at Ser234 (recruiting TRAF6 for K63-ubiquitination/stabilization), ERK phosphorylation at Ser132 (triggering XPO1-mediated nuclear export and initiation of ESC differentiation), and deubiquitination by USP10, USP11, ATXN3, and DUB3; in pluripotent cells KLF4 protein stability is maintained through direct interaction with NANOG, SOX2, and STAT3 that facilitate association with RNA Pol II, while Sox2-Klf4 cooperation drives genome-wide epigenetic remodeling during reprogramming; KLF4 can also form liquid-liquid condensates with methylated DNA through its DNA-binding domain to organize chromatin; in the immune system KLF4 controls macrophage M1/M2 polarization (regulated by SENP1-mediated de-SUMOylation affecting NF-κB) and determines DC2B dendritic cell lineage identity; in vascular biology KLF4 together with KLF2 is absolutely required for endothelial integrity and vascular homeostasis in adult animals.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KLF4 is a zinc-finger transcription factor that binds CACCC/GC-rich and methylated-CpG motifs to control cell proliferation, differentiation, and lineage identity across epithelial, vascular, hematopoietic, and pluripotent contexts [#0, #41]. It contains separable functional modules—an activation domain (aa 91–117) and a repression domain (aa 181–388)—and acts as either activator or repressor depending on cellular context and partner availability [#0]. Through direct promoter occupancy it represses targets such as p53 (enabling RAS-driven transformation), LDHA, MSI2, MAP2K7, and SPARC, and activates targets including NANOG, NDRG2, BMP4, IL-10, and CDKN1C/p57, thereby imposing growth arrest in untransformed cells while supporting tumor maintenance in specific malignancies [#6, #11, #14, #15, #22, #23, #43]. In pluripotency, KLF4 cooperates synergistically with OCT4 and SOX2 at the NANOG promoter and partners with SOX2 to drive genome-wide epigenetic remodeling during reprogramming [#11, #37]; its DNA-binding domain forms liquid-liquid condensates with NANOG promoter DNA in a CpG-methylation-enhanced manner, providing a biophysical mode of chromatin organization [#38]. KLF4 activity is tightly gated by post-translational modification and trafficking: PRMT5-mediated arginine methylation blocks VHL-dependent ubiquitination [#17], TTLL4/TTLL1 polyglutamylation at Glu381 blocks K48-ubiquitination to sustain reprogramming and embryonic viability [#28], PLK1 phosphorylation at Ser234 recruits TRAF6 for stabilizing K63-ubiquitination [#31], and ERK phosphorylation at Ser132 triggers XPO1-mediated nuclear export that initiates exit from naive pluripotency [#27]; a panel of deubiquitinases including USP10 and USP11 further tunes KLF4 protein stability with opposing tumor outcomes [#32, #40]. In vivo, endothelial KLF4 acts redundantly with KLF2 to maintain vascular integrity [#24], and cell-type-specific roles extend to macrophage polarization, dendritic cell DC2B lineage determination, and myogenic differentiation [#46, #52, #53].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established KLF4 as a sequence-specific DNA-binding transcription factor with defined activation and repression modules, answering what kind of molecular activity it carries.\",\n      \"evidence\": \"Gel mobility shift with recombinant protein plus GAL4 domain-fusion mapping of activation (aa 91–117) and repression (aa 181–388) domains\",\n      \"pmids\": [\"9422764\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define endogenous target genes\", \"No structural basis for the dual activator/repressor switch\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showed KLF4 cooperates with and physically contacts other transcription factors (Sp1, KLF6) at tissue-specific promoters, framing it as a combinatorial regulator rather than a solo factor.\",\n      \"evidence\": \"EMSA, co-IP, and co-transfection reporter assays at keratin promoters\",\n      \"pmids\": [\"10859317\", \"10802067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interaction surfaces not mapped\", \"In vivo relevance of cooperativity not tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the context-dependence of KLF4–p53 regulation, showing KLF4 represses p53 to enable transformation in cancer cells but induces p53 to arrest VSMC proliferation.\",\n      \"evidence\": \"Functional genomic screen, ChIP, shRNA, and p53-antisense epistasis across cancer and VSMC systems\",\n      \"pmids\": [\"16244670\", \"17659301\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"What determines activator-versus-repressor outcome at the p53 promoter is unresolved\", \"Cofactors switching directionality not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed KLF4 at the core of the pluripotency transcriptional network by demonstrating direct, cooperative activation of NANOG with OCT4 and SOX2.\",\n      \"evidence\": \"ChIP, EMSA, reporter assays, and knockdown with binding-site mutation in human ESCs\",\n      \"pmids\": [\"19522013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution relative to other pluripotency factors not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Expanded KLF4's tumor-suppressive transcriptional program to metabolism, invasion, and stemness regulators, mapping a set of directly bound targets.\",\n      \"evidence\": \"ChIP, reporter, and rescue/epistasis for SPARC, LDHA, MSI2, NDRG2, MAP2K7 across cancer models in vitro and in vivo\",\n      \"pmids\": [\"20215880\", \"24947925\", \"27449499\", \"28656310\", \"27872496\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific selection of these targets not explained\", \"Genome-wide occupancy in each tumor type incomplete\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a methylation-dependent DNA-binding mode, showing KLF4 reads methylated CpG sites to remodel chromatin and activate gene programs.\",\n      \"evidence\": \"ChIP-seq, ATAC-seq, and R458A zinc-finger mutagenesis with phenotypic rescue in glioblastoma cells\",\n      \"pmids\": [\"28553926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How methyl-reading is integrated with unmethylated CACCC binding genome-wide is unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established the absolute in vivo requirement for endothelial KLF4/KLF2 in vascular integrity and coagulation homeostasis.\",\n      \"evidence\": \"Inducible endothelial-specific KLF2/KLF4 double-knockout mice with lethal vascular phenotype and allele-dosage epistasis\",\n      \"pmids\": [\"28239661\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct endothelial target genes driving the phenotype not enumerated\", \"Division of labor between KLF2 and KLF4 unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated that subcellular localization gates KLF4 function, with ERK-driven S132 phosphorylation and XPO1 export acting as the trigger for exit from naive pluripotency.\",\n      \"evidence\": \"S132A mutagenesis, XPO1 co-IP, imaging, and differentiation assays in ESCs\",\n      \"pmids\": [\"29526737\", \"26050649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether nuclear export drives degradation or sequestration generally is context-dependent and not fully separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Built a comprehensive picture of KLF4 protein-stability control through interlocking post-translational modifications and a panel of E3 ligases and deubiquitinases.\",\n      \"evidence\": \"Co-IP, ubiquitination/methylation/polyglutamylation assays, phosphosite and lysine mutagenesis, knockin and knockout mice (PRMT5, VHL, TTLL4/1, PLK1/TRAF6, USP10, USP11, ATXN3, TRAF7)\",\n      \"pmids\": [\"26420673\", \"24388984\", \"29593216\", \"31281496\", \"31748695\", \"34114341\", \"31563563\", \"31730901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The hierarchy and competition among these modifications in a single cell state is not resolved\", \"Stimuli selecting each modification remain partly undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed KLF4 stability in stem cells is maintained by direct interaction with pluripotency factors, coupling its half-life to cell identity.\",\n      \"evidence\": \"Cycloheximide chase, reciprocal Co-IP with NANOG/SOX2/STAT3/Pol II, and differentiation-blocking mutagenesis\",\n      \"pmids\": [\"31221664\", \"31722212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking partner binding to reduced turnover not fully defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided a biophysical mechanism for KLF4-mediated chromatin organization via methylation-enhanced liquid-liquid phase condensation of its DNA-binding domain.\",\n      \"evidence\": \"In vitro LLPS reconstitution with purified DBD and methylated vs. unmethylated NANOG promoter DNA\",\n      \"pmids\": [\"34552088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo demonstration of KLF4 condensates at endogenous loci is lacking\", \"Functional consequence of condensation versus simple binding not separated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mapped opposing, cell-type-specific KLF4 functions in tissue fibrosis, inflammation, and immune lineage identity, demonstrating that local context dictates pro- or anti-fibrotic outcomes.\",\n      \"evidence\": \"Cell-type-specific conditional knockouts in mesenchymal, myeloid, tubular, and DC compartments with defined disease phenotypes and pathway epistasis\",\n      \"pmids\": [\"34893592\", \"31337692\", \"39147900\", \"46\", \"40702338\", \"37723138\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals dictating opposite KLF4 outputs across cell types not unified\", \"Direct versus indirect targets in several compartments incomplete\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single KLF4 protein integrates its modification state, partner availability, and methyl-DNA reading to deterministically choose activation versus repression at a given locus in a given cell type.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking PTM combinatorics to target-gene directionality\", \"Conflicting reports on KLF4-TERT directionality across tissues unreconciled\", \"No genome-wide co-occupancy/condensate map in defined cell states\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 6, 11, 41]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 41, 38]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [27, 20]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [20, 27]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [41, 38]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 6, 11, 41]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6, 9, 23, 52]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [11, 30, 37, 52]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [36, 46, 53]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 14, 23, 24]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SOX2\", \"OCT4\", \"NANOG\", \"PRMT5\", \"TRAF6\", \"USP10\", \"USP11\", \"XPO1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}