{"gene":"LEF1","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":1998,"finding":"Integrin-linked kinase (ILK) overexpression promotes formation of a complex between β-catenin and LEF-1, leading to nuclear translocation of β-catenin and transcriptional activation by the LEF-1/β-catenin complex; LEF-1 protein levels are upregulated by ILK overexpression and rapidly modulated by cell detachment from extracellular matrix.","method":"Co-immunoprecipitation, Western blotting, invasion assays, overexpression in intestinal and mammary epithelial cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and functional assays in two cell line systems, single lab","pmids":["9539744"],"is_preprint":false},{"year":1996,"finding":"BMP-4 can activate Lef1 gene expression, and Lef1 expression in epithelium is required for transmission of inductive signals between epithelial and mesenchymal tissues during tooth and whisker organogenesis, as shown by tissue recombination experiments with Lef1-deficient embryos.","method":"Tissue recombination of normal and Lef1-null embryos, BMP-4 treatment, targeted gene inactivation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with tissue recombination, replicated across tooth and whisker organ systems","pmids":["8647435"],"is_preprint":false},{"year":2001,"finding":"Lef1 requires Wnt signaling and stabilized β-catenin to activate hair-specific keratin genes and control hair differentiation; its HMG DNA-binding domain mediates these effects. A β-catenin-binding-domain-deleted Lef1 (ΔNLef1) instead promotes sebocyte differentiation rather than hair differentiation, demonstrating that Lef1's role in cell-fate decisions in multipotent skin stem cells depends on its β-catenin interaction status.","method":"Transgenic mouse overexpression, domain-deletion constructs (ΔNLef1), histological and gene expression analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple domain-deletion constructs tested in vivo, phenotypic readouts replicated across lineages","pmids":["11445543"],"is_preprint":false},{"year":2001,"finding":"LEF-1 physically interacts with the paired-like homeodomain protein Alx4 through Alx4's proline-rich N-terminal domain and LEF-1's HMG-box DNA-binding domain; LEF-1 and Alx4 can bind simultaneously to adjacent sites on the N-CAM promoter and alter its activity, providing a mechanism for mesenchymal-specific LEF-1 activity.","method":"Co-immunoprecipitation, pulldown assays, electrophoretic mobility shift assay (EMSA), luciferase reporter assay, domain-deletion analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding reconstitution with domain mapping, promoter activity assay, single lab with multiple orthogonal methods","pmids":["11696550"],"is_preprint":false},{"year":2004,"finding":"LEF1 directly binds multiple sites in the Dll1 (Delta-like 1) promoter in vitro and in vivo, and LEF1-binding site mutations in the Dll1-LacZ transgene impair its expression in presomitic mesoderm; induced LEF1-β-catenin expression activates endogenous Dll1, establishing that Wnt/LEF1 signaling links to Notch signaling via direct transcriptional regulation of Dll1 in somitogenesis.","method":"Chromatin immunoprecipitation (ChIP), in vitro DNA binding, Dll1-LacZ transgenic reporter with LEF1-site mutations, conditional LEF1-β-catenin induction in fibroblasts","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro and in vivo ChIP, promoter mutagenesis in transgenic mice, functional rescue, multiple orthogonal methods","pmids":["15545629"],"is_preprint":false},{"year":2005,"finding":"Loss of Lef1 in mice causes significantly increased apoptosis specifically within the dental epithelium (not mesenchyme), arresting tooth development at the bud stage; FGF4 treatment inhibits apoptosis and rescues tooth development in Lef1-null mice, identifying LEF1 as a critical epithelial survival factor acting upstream of FGF signaling in tooth morphogenesis.","method":"Lef1 knockout mouse analysis, TUNEL apoptosis assay, Wnt1-Cre/R26R cell-lineage tracing, FGF4 rescue experiment","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with specific cellular phenotype (apoptosis), rescue experiment, lineage tracing, multiple orthogonal methods","pmids":["15649466"],"is_preprint":false},{"year":2005,"finding":"Nrarp stabilizes LEF1 protein by blocking its ubiquitination; Nrarp knockdown in zebrafish phenocopies lef1 knockdown in neural-crest-cell development, and Nrarp independently regulates LEF1 protein turnover (Wnt pathway) separately from its regulation of Notch signaling.","method":"Antisense morpholino knockdown in zebrafish, ubiquitination assay, co-immunoprecipitation, Western blotting","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — protein stability and ubiquitination assays combined with in vivo genetic knockdown and phenotypic rescue, single lab with multiple orthogonal methods","pmids":["16228014"],"is_preprint":false},{"year":2007,"finding":"LEF1 is a decisive transcription factor in neutrophil granulopoiesis, controlling proliferation, lineage commitment, and granulocytic differentiation by directly regulating target genes C/EBP-α, cyclin D1, c-myc, survivin, and the ELA2 (neutrophil elastase) promoter; myeloid progenitors from severe congenital neutropenia patients show severe downregulation of LEF1 and its targets.","method":"Gene expression analysis in primary patient cells, promoter binding assays (ELA2 promoter), functional studies in myeloid progenitors","journal":"Annals of the New York Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct promoter binding and functional characterization, supported by patient cell data, but limited methodological detail in this abstract","pmids":["17360796"],"is_preprint":false},{"year":2007,"finding":"PITX2 isoforms directly regulate the LEF1 promoter (identified by ChIP); β-catenin synergistically enhances LEF1 promoter activation in combination with PITX2 and Lef1. PITX2 interacts with Lef1 at two sites (the β-catenin-binding domain is dispensable), while β-catenin binds the PITX2 homeodomain and Lef1 binds the PITX2 C-terminal tail; all three proteins can interact simultaneously.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, co-immunoprecipitation, domain-deletion analysis, transgenic mouse Lef1-LacZ reporter","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP, promoter reporter, reciprocal co-IP with domain mapping, in vivo transgenic validation, multiple orthogonal methods in single lab","pmids":["17785445"],"is_preprint":false},{"year":2009,"finding":"LEF1 occupies and activates the androgen receptor (AR) promoter in prostate cancer cells; LEF1 overexpression increases AR expression and enhances growth and invasion, while LEF1 knockdown decreases AR expression and reduces growth and invasion in androgen-independent prostate cancer cells.","method":"Chromatin immunoprecipitation (ChIP), gel shift (EMSA), luciferase reporter assay, siRNA knockdown, overexpression","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP, EMSA, and luciferase reporter all confirm direct AR promoter occupancy and regulation, with functional KD/OE phenotypes, single lab","pmids":["19351848"],"is_preprint":false},{"year":2009,"finding":"BMP2 stimulates expression of a naturally occurring N-terminally truncated Lef1 isoform (Lef1ΔN) driven by an alternative promoter (p2) within intron 3-4 of Lef1, while Wnt3a blocks this expression; Runx2 regulates the p2 promoter activity; stable overexpression of Lef1ΔN in osteoblasts induces osteocalcin and type 1 collagen, promoting terminal differentiation.","method":"Promoter reporter assays, Runx2 knockdown/overexpression, stable overexpression of Lef1ΔN, RT-PCR, gene expression analysis","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter assays and functional overexpression with differentiation markers, single lab, multiple methods","pmids":["19650108"],"is_preprint":false},{"year":2011,"finding":"The splicing factor CELF2 controls signal-dependent alternative splicing of LEF1 exon 6 by binding two intronic sequences flanking the regulated exon; inclusion of exon 6 is required for optimal TCR-α chain mRNA expression during thymic development and upon T-cell signaling.","method":"siRNA knockdown of CELF2, splice-site blocking oligonucleotides, RT-PCR isoform analysis, RNA immunoprecipitation, functional readout of TCR-α expression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (CELF2 KD, direct exon blocking, RNA-IP, functional TCR-α output), mechanistic detail clearly established","pmids":["21444716"],"is_preprint":false},{"year":2014,"finding":"LEF-1 translation is regulated by an IRES in its 5' UTR; the LEF1 IRES recruits eIF4A and is controlled by a Bcr-Abl–mTOR–eIF4A axis in CML cells. Inhibition of mTOR (PP242) or eIF4A (hippuristanol) suppresses IRES-mediated LEF1 translation and triggers dissociation of LEF1 mRNA from polyribosomes.","method":"IRES reporter assays, polyribosome fractionation, pharmacological inhibition with PP242 and hippuristanol, primary patient CML cell analysis","journal":"Open biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — IRES reconstitution, polyribosome analysis, two orthogonal small-molecule inhibitors, primary patient cells, single lab with multiple methods","pmids":["25392452"],"is_preprint":false},{"year":2014,"finding":"LEF1 directly binds to the CYLD promoter and suppresses CYLD transcription; upon selenite treatment, LEF1 dissociates from the CYLD promoter, relieving suppression of CYLD (a deubiquitinase), leading to removal of K63-linked ubiquitin chains from RIP1, formation of a death-inducing complex, and caspase-8-dependent apoptosis in colorectal cancer cells.","method":"Chromatin immunoprecipitation (ChIP), siRNA knockdown, Western blotting, xenograft model with immunohistochemistry","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP directly demonstrates LEF1 occupancy at CYLD promoter; dissociation and functional apoptotic readouts, single lab","pmids":["24577083"],"is_preprint":false},{"year":2015,"finding":"miR-34a directly targets the 3'-UTR of LEF1 mRNA to repress its expression, and this miR-34a-LEF1 axis regulates epithelial-mesenchymal transition (EMT), migration, and invasion of prostate cancer cells; luciferase reporter assays confirmed direct 3'-UTR binding.","method":"Luciferase reporter assay with LEF1 3'-UTR, miR-34a overexpression/inhibition, migration and invasion assays","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR binding confirmed by luciferase assay, functional invasion phenotype, single lab","pmids":["25587085"],"is_preprint":false},{"year":2015,"finding":"LEF1 directly regulates tyrosinase (TYR) gene transcription; LEF1 binds to the core GTTTGAT sequence (-56 to -50) in the TYR promoter as shown by ChIP and EMSA; LEF1 and MITF synergistically transactivate the TYR promoter.","method":"Luciferase reporter assay, siRNA knockdown, ChIP, promoter deletion/mutation analysis, EMSA (implied by 'LEF-1 interacts with TYR promoter')","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assays confirm direct promoter occupancy with functional output, single lab","pmids":["26580798"],"is_preprint":false},{"year":2016,"finding":"Tcf1 and Lef1 possess intrinsic histone deacetylase (HDAC) activity; mutation of five conserved amino acids in the Tcf1 HDAC domain diminishes HDAC activity and impairs suppression of CD4+ lineage genes in CD8+ T cells; Tcf1/Lef1-deficient CD8+ T cells exhibit histone hyperacetylation at lineage-inappropriate loci.","method":"HDAC activity assay, domain mutagenesis (5-aa mutation), histone acetylation profiling, conditional knockout mouse model, gene expression analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 1 / Strong — intrinsic enzymatic activity demonstrated by in vitro HDAC assay, domain mutagenesis, and in vivo genetic KO with chromatin readout; multiple orthogonal methods","pmids":["27111144"],"is_preprint":false},{"year":2016,"finding":"Sp5 and Sp8 bind directly to GC boxes in Wnt target gene enhancers and interact with chromatin-bound Tcf1/Lef1 to facilitate recruitment of β-catenin to select target gene enhancers, acting as gene-specific transcriptional coactivators in a feed-forward loop.","method":"ChIP-seq in mouse embryos and ESCs, co-immunoprecipitation, enhancer reporter assays, double-mutant genetic analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq and co-IP show direct interaction and enhancer co-occupancy, single lab","pmids":["26969725"],"is_preprint":false},{"year":2016,"finding":"Sox2 acts as a transcriptional repressor that directly binds a functional site in the Lef-1 promoter and suppresses β-catenin-dependent Lef-1 transcription; ChIP and DNA-protein binding (EMSA) confirmed Sox2 occupancy; suppression of Sox2 in SMG placodes relieves repression and enables Wnt-induced Lef-1 expression during submucosal gland morphogenesis.","method":"ChIP, EMSA/DNA-protein binding, luciferase reporter assay with promoter mutation, conditional Sox2 deletion, primary airway epithelial cultures","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP plus EMSA plus reporter mutagenesis plus genetic KO all converge on same mechanism, single lab","pmids":["24487391"],"is_preprint":false},{"year":2019,"finding":"The m6A methyltransferase METTL3 promotes LEF1 mRNA m6A methylation and increases LEF1 total mRNA levels; METTL3 silencing decreases LEF1 m6A methylation and mRNA level, reduces Wnt/β-catenin signaling activity, and impairs osteosarcoma cell proliferation/invasion; LEF1 overexpression abrogates METTL3 silencing effects.","method":"Lentiviral METTL3 silencing, m6A methylation assay, RT-PCR, rescue overexpression of LEF1, functional proliferation/invasion assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m6A assay plus functional rescue, single lab","pmids":["31253399"],"is_preprint":false},{"year":2019,"finding":"LEF-1 drives nuclear localization of β-catenin in myeloid leukemia cells; nuclear LEF-1 and β-catenin levels are tightly correlated; LEF-1 knockdown perturbs β-catenin nuclear localization and transcriptional activation, while LEF-1 overexpression promotes nuclear β-catenin accumulation and Wnt-responsive transcription in previously Wnt-unresponsive cells.","method":"Nuclear/cytoplasmic proteomic fractionation, β-catenin interactome by mass spectrometry, LEF-1 knockdown and overexpression, reporter assays, primary AML blast analysis","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 2 / Strong — interactome MS plus KD/OE functional studies plus primary patient cells, multiple orthogonal methods, single lab","pmids":["30630973"],"is_preprint":false},{"year":2019,"finding":"MYC directly activates LEF1 transcription (ChIP-seq confirms MYC occupancy at LEF1 locus); MYC-induced LEF1 causes retention of β-catenin in the nucleus activating the Wnt pathway; LEF1 is required for MYC-induced expression of PPARδ and ACAD9; LEF1 is required for viability of MYC-expressing colon cancer cells.","method":"RNA-seq, ChIP-seq, RT-qPCR, Western blotting, siRNA knockdown, metabolomics","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq confirms direct MYC binding to LEF1 locus; multiple functional readouts, single lab","pmids":["31623618"],"is_preprint":false},{"year":2019,"finding":"TCF1/LEF1 interact with HTLV-1 Tax protein and inhibit Tax-dependent viral gene expression, NF-κB activation, and AP-1 activation; HTLV-1 replication is suppressed in the presence of TCF1 or LEF1; T-cell activation suppresses TCF1/LEF1 expression, enabling Tax function.","method":"Co-immunoprecipitation, reporter assays (NF-κB, AP-1, viral LTR), TCF1/LEF1 overexpression, T-cell activation experiments, STLV-1-infected macaque thymus analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and reporter assays establish direct Tax interaction and functional inhibition, in vivo macaque data support model, single lab","pmids":["25646419"],"is_preprint":false},{"year":2019,"finding":"SNAIL1 upregulates LEF1 expression; LEF1 knockout (CRISPR/Cas9) and expression of a β-catenin-binding-deficient LEF1 mutant both impair SNAIL1-induced alternative Wnt/β-catenin target gene expression and cancer cell invasion; LEF1 accounts for ~35% of SNAIL1-induced transcriptional changes in colorectal cancer cells, acting as a strictly β-catenin-dependent downstream effector of SNAIL1.","method":"CRISPR/Cas9 LEF1 knockout, LEF1 β-catenin-binding mutant engineering, conditional SNAIL1 expression, transcriptome analysis, invasion assay, xenotransplantation","journal":"International journal of cancer","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO and domain-specific mutant provide clean mechanistic separation, replicated with multiple readouts, single lab","pmids":["31463973"],"is_preprint":false},{"year":2019,"finding":"Mutant Lef1 (β-catenin-independent) transcriptionally activates Gata6 independently of β-catenin; Gata6 ablation in mutant Lef1-overexpressing mice decreases the proportion of sebaceous gland tumors while increasing total tumor burden and correlating with impaired DNA mismatch repair (decreased Mlh1, Msh2).","method":"Transgenic mouse models (mutant Lef1 overexpression, Gata6 conditional KO), in utero lentiviral Gata6 overexpression, gene expression analysis, tumor phenotyping","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic in vivo epistasis with multiple readouts, single lab","pmids":["30886049"],"is_preprint":false},{"year":2019,"finding":"Tcf1 and Lef1 are required for immunosuppressive function of regulatory T cells; Tcf1/Lef1-deficient Tregs show reduced expression of signature genes (Ikzf4, Izumo1r) and aberrant upregulation of cytotoxic CD8+ effector genes (Prdm1, Ifng); Tcf1 ChIP-seq reveals co-occupancy of Tcf1 and Foxp3 at key Treg signature and cytotoxic effector gene loci.","method":"Conditional Treg-specific Tcf1/Lef1 double KO, transcriptomic analysis, Tcf1 ChIP-seq, colitis protection assay, autoimmunity phenotyping","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq plus conditional KO plus multiple functional assays, mechanistic genome-wide resolution","pmids":["30837262"],"is_preprint":false},{"year":2019,"finding":"Asporin (ASPN) directly binds LEF1 and promotes LEF1-mediated transcriptional activation of PTGS2, IL6, and WISP1 promoters independently of β-catenin; ASPN-mediated suppression of gastric cancer cell apoptosis is abolished by LEF1 knockdown or PTGS2 inhibition.","method":"Co-immunoprecipitation (ASPN-LEF1 interaction), ChIP (LEF1 promoter occupancy at PTGS2, IL6, WISP1), luciferase reporter assay, siRNA knockdown, overexpression rescue","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding by Co-IP, ChIP and reporter assays, functional rescue, single lab","pmids":["34127813"],"is_preprint":false},{"year":2021,"finding":"Tcf1 and Lef1 maintain three-dimensional genome organization in mature CD8+ T cells at multiple scales; Tcf1 directly enforces chromatin interactions and accessibility, promoting formation of interconnected hubs for T cell identity gene promoter–enhancer contacts and repression of non-T lineage genes.","method":"Hi-C (chromosome conformation capture), ATAC-seq (chromatin accessibility), Tcf1 ChIP-seq, conditional ablation of Tcf1/Lef1 in mature CD8+ T cells, transcriptomics","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — Hi-C, ATAC-seq, and ChIP-seq provide genome-wide mechanistic resolution, conditional KO in mature cells, multiple orthogonal methods","pmids":["34615872"],"is_preprint":false},{"year":2021,"finding":"LEF1 recruits PRMT6 (protein arginine methyltransferase 6) to the CCND1 (cyclin D1) promoter; LEF1 knockdown reduces cyclin D1 expression; PRMT6 knockdown increases G1 cell cycle arrest and decreases proliferation.","method":"Co-immunoprecipitation (LEF1-PRMT6 interaction), ChIP (LEF1/PRMT6 at CCND1 promoter), siRNA knockdown, cell cycle analysis","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP confirm interaction and co-occupancy, functional KD readouts, single lab","pmids":["34001852"],"is_preprint":false},{"year":2021,"finding":"Oligonucleotide-based PROTACs (O'PROTACs) incorporating LEF1-binding double-stranded DNA sequences can induce proteasomal degradation of LEF1 protein via E3 ubiquitin ligase recruitment, impeding LEF1 transcriptional activity and inhibiting cancer cell growth in vitro and in vivo.","method":"O'PROTAC protein degradation assay, ubiquitination assay, transcriptional activity reporter, cell viability and xenograft tumor growth assays","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein degradation demonstrated by multiple functional assays, mechanism dependent on DNA-binding domain, single lab","pmids":["34397171"],"is_preprint":false},{"year":2021,"finding":"Loss of Lef1 in Apc-mutant intestinal adenomas markedly increases tumor initiation and cell proliferation, reduces Wnt antagonist expression, increases Myc expression, and promotes ectopic crypt formation, revealing a negative feedback role for ectopic Lef1 that suppresses intestinal tumorigenesis by restricting adenoma cell dedifferentiation.","method":"Conditional Lef1 deletion in intestinal stem cells of Apc-mutant mice, tumor burden and proliferation quantification, gene expression analysis","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in multiple Apc-mutant mouse models with quantitative tumor and proliferation readouts, in vivo epistasis","pmids":["34788095"],"is_preprint":false},{"year":2019,"finding":"Zeb1 is indirectly recruited to regulatory regions of glioblastoma target genes via interaction with Lef1 (Wnt pathway effector), resulting in transcriptional activation independently of Wnt signaling; this Zeb1/Lef1 co-regulatory mechanism activates invasion-promoting genes including Prex1.","method":"Genome-wide Zeb1 ChIP-seq, transcriptomics in glioblastoma stem-like cells, Lef1 ChIP-seq, overexpression and knockdown, in vivo invasion assay","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq demonstrates genome-wide co-occupancy with functional transcriptional and invasion readouts, single lab","pmids":["29903919"],"is_preprint":false},{"year":2016,"finding":"Lef1-expressing fibroblasts in neonatal papillary dermis constitute a transient regenerative cell type; gain-of-function Lef1 expression in adult dermal fibroblasts primes the skin macroenvironment to enhance repair and regeneration of hair follicles with arrector pili muscles, while loss-of-function Lef1 deletion impairs this regenerative capacity.","method":"scRNA-seq, gain-of-function and loss-of-function genetic mouse models for Lef1 in fibroblasts, wound healing assays, histological analysis","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic gain- and loss-of-function with specific wound healing and hair follicle regeneration readouts, single lab","pmids":["32990218"],"is_preprint":false},{"year":2023,"finding":"LEF1 overexpression in NKT cells drives a central memory transcriptional program, promoting CD62L+ frequency and NKT expansion while limiting exhaustion; CRISPR/Cas9-mediated LEF1 knockout reduces CD62L+ frequency after stimulation; LEF1-expressing CAR-NKTs show superior neuroblastoma tumor control in vivo.","method":"CRISPR/Cas9 LEF1 knockout, LEF1 overexpression, Wnt3a ligand treatment, transcriptional profiling, xenograft tumor model","journal":"Cancer immunology research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO and OE with transcriptional and in vivo functional readouts, single lab","pmids":["36484736"],"is_preprint":false},{"year":2019,"finding":"LEF1 inhibition decreases DCLK1-B expression by blocking LEF1 binding to the DCLK1-B promoter in colorectal cancer cells; LEF1/DCLK1-B axis regulates cancer stemness and self-renewal; niclosamide blocks LEF1-DCLK1-B promoter binding and eradicates cancer stem-like cells.","method":"ChIP (LEF1 occupancy at DCLK1-B promoter), siRNA/shRNA knockdown, luciferase reporter, sphere formation assays, xenograft model","journal":"Clinical cancer research : an official journal of the American Association for Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms direct promoter binding; functional cancer stemness assays, single lab","pmids":["30446587"],"is_preprint":false},{"year":2019,"finding":"LEF1 directly activates transcription of the TGF-β pathway gene ID1 by binding to its promoter in esophageal squamous cell carcinoma; ASPN-mediated LEF1-ID1 activation promotes cancer stem cell-like properties and tumorigenicity.","method":"Luciferase reporter assay, ChIP-qPCR (LEF1 binding at ID1 promoter), RNA-seq, siRNA knockdown","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay confirm direct ID1 promoter binding, single lab","pmids":["31296250"],"is_preprint":false},{"year":2021,"finding":"β-catenin/LEF1 complex directly binds the IGF-IIR promoter (putative LEF1 consensus site identified) and activates IGF-IIR expression under Ang-II-induced hypertensive conditions in cardiac cells, promoting cardiac hypertrophy.","method":"Luciferase reporter assay, immunoprecipitation, nuclear-cytosolic protein fractionation, Western blot in H9c2 cells and SHR rat tissue","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — putative binding site with reporter assay and IP, limited direct ChIP confirmation, single lab","pmids":["31480672"],"is_preprint":false},{"year":2023,"finding":"Differential expression of long and short LEF1 isoforms is a key regulatory mechanism of cellular senescence; LEF1 dysregulation is associated with idiopathic pulmonary fibrosis; this isoform balance was identified computationally and validated in cell culture and human lung tissue.","method":"Transcriptome comparative analysis, cell culture senescence assays, RT-qPCR in human lung tissue samples, computational transcriptional network analysis","journal":"Aging cell","confidence":"Low","confidence_rationale":"Tier 3 / Weak — isoform functional distinction supported mainly by expression profiling and cell culture, limited mechanistic depth on how isoforms differ functionally","pmids":["37961030"],"is_preprint":false}],"current_model":"LEF1 is an HMG-box transcription factor that functions as the primary nuclear effector of canonical Wnt/β-catenin signaling: it binds specific DNA sequences (through its HMG domain) to activate target genes (including Dll1, AR, cyclin D1, TYR, ID1, DCLK1-B, and miR-17-92 cluster) or repress others (CYLD), recruits β-catenin as a co-activator, and is itself regulated at multiple levels including IRES-mediated translation (controlled by Bcr-Abl/mTOR/eIF4A), alternative splicing by CELF2, protein stability via Nrarp-mediated protection from ubiquitination, isoform-specific promoter usage regulated by BMP2/Runx2, m6A methylation by METTL3, and transcriptional repression by Sox2; it also possesses intrinsic HDAC activity required for silencing lineage-inappropriate genes in T cells, and physically interacts with diverse partners including Alx4, PITX2, PRMT6, Zeb1, ASPN, and Tax to modulate context-specific transcriptional outputs across development, immunity, and cancer."},"narrative":{"mechanistic_narrative":"LEF1 is an HMG-box DNA-binding transcription factor that serves as a nuclear effector of Wnt/β-catenin signaling, directing context-specific transcriptional programs across organogenesis, hematopoiesis, immunity, and cancer [PMID:11445543, PMID:15545629, PMID:30630973]. Its HMG domain mediates sequence-specific promoter occupancy, and its β-catenin-binding domain determines cell-fate output: β-catenin-competent LEF1 drives hair differentiation and Wnt target activation whereas β-catenin-binding-deficient or N-terminally truncated forms redirect lineage decisions toward sebocytes and osteoblasts [PMID:11445543, PMID:19650108]. LEF1 directly binds and activates a broad set of target promoters — Dll1 linking Wnt to Notch in somitogenesis, the androgen receptor, tyrosinase (synergizing with MITF), ID1, DCLK1-B, and CCND1 — and represses CYLD, whose derepression upon LEF1 dissociation triggers caspase-8-dependent apoptosis [PMID:15545629, PMID:19351848, PMID:26580798, PMID:31296250, PMID:30446587, PMID:34001852, PMID:24577083]. In T cells LEF1 (with TCF1) carries intrinsic histone deacetylase activity required to silence lineage-inappropriate genes and, more broadly, enforces three-dimensional genome organization and promoter–enhancer hubs that maintain T-cell identity, regulatory T-cell function, and memory programs [PMID:27111144, PMID:34615872, PMID:30837262, PMID:36484736]. LEF1 partners beyond β-catenin to diversify its outputs, interacting with homeodomain proteins Alx4 and PITX2, the methyltransferase PRMT6, the transcription factor Zeb1, and the matrix protein asporin to drive β-catenin-independent transcription [PMID:11696550, PMID:17785445, PMID:34001852, PMID:29903919, PMID:34127813]. LEF1 itself is regulated at every level: transcriptionally by MYC, SNAIL1, BMP2/Runx2-driven alternative promoter usage, and Sox2-mediated repression; post-transcriptionally by IRES-mediated translation under a Bcr-Abl/mTOR/eIF4A axis, CELF2-controlled alternative splicing, miR-34a, and METTL3-dependent m6A methylation; and post-translationally by Nrarp-mediated protection from ubiquitination [PMID:31623618, PMID:31463973, PMID:19650108, PMID:24487391, PMID:25392452, PMID:21444716, PMID:25587085, PMID:31253399, PMID:16228014]. In tumorigenesis its role is context-dependent — promoting prostate, gastric, and colorectal cancer phenotypes yet acting as a negative-feedback suppressor of intestinal adenoma dedifferentiation — and its DNA-binding domain has been exploited for targeted degradation by oligonucleotide PROTACs [PMID:19351848, PMID:34127813, PMID:31463973, PMID:34788095, PMID:34397171].","teleology":[{"year":1996,"claim":"Established LEF1 as an essential epithelial mediator of inductive tissue interactions during organogenesis, placing it downstream of BMP signaling.","evidence":"Tissue recombination of Lef1-null embryos and BMP-4 treatment in tooth and whisker systems","pmids":["8647435"],"confidence":"High","gaps":["Direct target genes mediating the inductive signal not identified","Relationship to Wnt/β-catenin not yet addressed"]},{"year":1998,"claim":"Linked LEF1 to β-catenin and upstream ILK/ECM signaling, showing LEF1/β-catenin complex formation drives nuclear β-catenin and transcription.","evidence":"Co-IP, Western blot, and invasion assays in intestinal and mammary epithelial cells","pmids":["9539744"],"confidence":"Medium","gaps":["Direct transcriptional targets not defined","Single-lab cell-line system"]},{"year":2001,"claim":"Demonstrated that LEF1's β-catenin interaction status dictates cell-fate decisions and that homeodomain partners confer tissue specificity.","evidence":"Transgenic mouse domain-deletion (ΔNLef1) constructs; Co-IP/EMSA/reporter with Alx4","pmids":["11445543","11696550"],"confidence":"High","gaps":["Genome-wide target repertoire of β-catenin-independent LEF1 not mapped","Mechanism of partner selection in vivo unresolved"]},{"year":2004,"claim":"Showed LEF1 directly bridges Wnt to Notch signaling by transcriptionally activating Dll1 in somitogenesis.","evidence":"ChIP, promoter mutagenesis in Dll1-LacZ transgenic mice, inducible LEF1-β-catenin in fibroblasts","pmids":["15545629"],"confidence":"High","gaps":["Cooperating factors at the Dll1 promoter not defined"]},{"year":2005,"claim":"Identified LEF1 as an epithelial survival factor acting upstream of FGF signaling, explaining the developmental arrest phenotype.","evidence":"Lef1 KO mouse, TUNEL, lineage tracing, FGF4 rescue in tooth development","pmids":["15649466"],"confidence":"High","gaps":["Direct anti-apoptotic LEF1 targets not identified","Connection between LEF1 and FGF4 transcription not mapped"]},{"year":2005,"claim":"Defined a post-translational control point for LEF1 abundance via Nrarp-mediated protection from ubiquitination.","evidence":"Zebrafish morpholino knockdown, ubiquitination assay, Co-IP in neural crest development","pmids":["16228014"],"confidence":"High","gaps":["E3 ligase responsible for LEF1 ubiquitination not identified","Whether Nrarp acts directly on LEF1 or via adaptors unclear"]},{"year":2007,"claim":"Established LEF1 as a decisive transcriptional regulator of neutrophil granulopoiesis controlling proliferation and differentiation genes.","evidence":"Patient myeloid progenitor analysis and ELA2 promoter binding in severe congenital neutropenia","pmids":["17360796"],"confidence":"Medium","gaps":["Limited methodological detail in abstract","Direct versus indirect regulation of listed targets not fully resolved"]},{"year":2007,"claim":"Revealed reciprocal regulation between LEF1 and PITX2, with simultaneous tripartite assembly of LEF1, PITX2, and β-catenin.","evidence":"ChIP, reporter assays, reciprocal Co-IP with domain mapping, transgenic Lef1-LacZ","pmids":["17785445"],"confidence":"High","gaps":["In vivo relevance of the tripartite complex to specific developmental loci unresolved"]},{"year":2009,"claim":"Implicated LEF1 in cancer by direct activation of the androgen receptor promoter driving prostate cancer growth and invasion.","evidence":"ChIP, EMSA, reporter, siRNA knockdown and overexpression in androgen-independent prostate cancer cells","pmids":["19351848"],"confidence":"High","gaps":["Upstream control of LEF1 in this context not addressed"]},{"year":2009,"claim":"Showed isoform-specific promoter usage (Lef1ΔN via the p2 promoter) under BMP2/Runx2 control redirects LEF1 toward osteoblast differentiation.","evidence":"Promoter reporter, Runx2 KD/OE, stable Lef1ΔN overexpression in osteoblasts","pmids":["19650108"],"confidence":"Medium","gaps":["Endogenous Lef1ΔN target gene repertoire not defined","β-catenin dependence of Lef1ΔN not directly tested here"]},{"year":2011,"claim":"Identified CELF2-mediated signal-dependent alternative splicing of LEF1 exon 6 as a regulator of TCR-α expression in thymocytes.","evidence":"CELF2 knockdown, splice-blocking oligos, RNA-IP, RT-PCR, functional TCR-α readout","pmids":["21444716"],"confidence":"High","gaps":["Functional consequence of exon 6 inclusion on LEF1 protein activity not fully defined"]},{"year":2014,"claim":"Established translational control of LEF1 via a 5'UTR IRES regulated by a Bcr-Abl/mTOR/eIF4A axis in CML.","evidence":"IRES reporters, polyribosome fractionation, PP242 and hippuristanol inhibition, primary CML cells","pmids":["25392452"],"confidence":"High","gaps":["IRES trans-acting factors beyond eIF4A not enumerated"]},{"year":2014,"claim":"Defined LEF1 as a transcriptional repressor of CYLD, linking its dissociation to caspase-8-dependent apoptosis in colorectal cancer.","evidence":"ChIP, siRNA knockdown, Western blot, xenograft with IHC under selenite treatment","pmids":["24577083"],"confidence":"Medium","gaps":["Mechanism driving LEF1 dissociation upon selenite not defined","Co-repressors at the CYLD promoter not identified"]},{"year":2015,"claim":"Mapped two layers of LEF1 control in cancer: miR-34a 3'UTR repression governing EMT, and direct LEF1/MITF synergy at the tyrosinase promoter.","evidence":"Luciferase 3'UTR reporter and invasion assays; ChIP/EMSA and reporter at TYR core sequence","pmids":["25587085","26580798"],"confidence":"Medium","gaps":["In vivo relevance of miR-34a–LEF1 axis not established","Structural basis of LEF1/MITF cooperativity unknown"]},{"year":2016,"claim":"Discovered an intrinsic HDAC activity in TCF1/LEF1 required to silence lineage-inappropriate genes, expanding LEF1 beyond a DNA-binding scaffold.","evidence":"In vitro HDAC assay, 5-aa domain mutagenesis, histone acetylation profiling, conditional KO","pmids":["27111144"],"confidence":"High","gaps":["Structural identity of the catalytic site not resolved","Substrate specificity beyond bulk histone acetylation not mapped"]},{"year":2016,"claim":"Showed gene-specific coactivators (Sp5/Sp8) recruit β-catenin to chromatin-bound LEF1, and Sox2 directly represses Lef1 transcription, defining input control of LEF1 activity.","evidence":"ChIP-seq, Co-IP, enhancer reporters; Sox2 ChIP/EMSA/reporter and conditional deletion in airway epithelium","pmids":["26969725","24487391"],"confidence":"High","gaps":["Generality of Sp5/Sp8 feed-forward loop across LEF1 targets unclear"]},{"year":2019,"claim":"Identified multiple new upstream regulators (MYC, SNAIL1, METTL3 m6A) that converge on LEF1 to sustain Wnt/β-catenin output and cancer phenotypes.","evidence":"ChIP-seq (MYC), CRISPR KO and β-catenin-binding mutant (SNAIL1), m6A assay and rescue (METTL3) in colon, colorectal and osteosarcoma cells","pmids":["31623618","31463973","31253399"],"confidence":"High","gaps":["Relative contribution of each input in a single cellular context not compared","m6A reader mediating METTL3 effect not identified"]},{"year":2019,"claim":"Defined LEF1 as a driver of β-catenin nuclear localization in leukemia, formalizing its role in nucleating Wnt-responsive transcription.","evidence":"Nuclear/cytoplasmic fractionation, β-catenin interactome MS, KD/OE, primary AML blasts","pmids":["30630973"],"confidence":"High","gaps":["Mechanism by which LEF1 retains β-catenin nuclear not structurally resolved"]},{"year":2019,"claim":"Established β-catenin-independent partnerships (Zeb1, ASPN) that redirect LEF1 to non-canonical invasion and stemness gene programs.","evidence":"Zeb1/Lef1 ChIP-seq in glioblastoma; ASPN-LEF1 Co-IP, ChIP and reporters at PTGS2/IL6/WISP1 and ID1 in gastric and esophageal cancers","pmids":["29903919","34127813","31296250"],"confidence":"Medium","gaps":["How partner binding overrides β-catenin requirement mechanistically unclear","Direct versus indirect recruitment in some cases not fully separated"]},{"year":2019,"claim":"Extended LEF1 function in immunity to regulatory T-cell suppression and to inhibition of HTLV-1 Tax-dependent viral transcription.","evidence":"Treg-specific Tcf1/Lef1 double KO with Tcf1 ChIP-seq; Tax Co-IP and viral LTR/NF-κB/AP-1 reporter assays","pmids":["30837262","25646419"],"confidence":"Medium","gaps":["Lef1-specific (vs Tcf1) contributions not always separated","Direct chromatin targets in Tregs are mostly Tcf1 ChIP-derived"]},{"year":2021,"claim":"Demonstrated LEF1 enforces 3D genome architecture and that it recruits PRMT6 to the CCND1 promoter, broadening its chromatin-organizing and cofactor-recruiting roles.","evidence":"Hi-C, ATAC-seq, Tcf1 ChIP-seq in CD8+ T cells; LEF1-PRMT6 Co-IP and ChIP at CCND1","pmids":["34615872","34001852"],"confidence":"High","gaps":["Direct DNA-contact contribution of LEF1 versus TCF1 to genome folding not isolated"]},{"year":2021,"claim":"Revealed a context-dependent tumor-suppressive negative-feedback role for ectopic LEF1 in Apc-mutant intestinal adenomas, complicating its oncogenic portrait.","evidence":"Conditional Lef1 deletion in Apc-mutant mouse intestine with tumor and proliferation quantification","pmids":["34788095"],"confidence":"High","gaps":["Molecular basis of the negative feedback (target genes) not fully defined"]},{"year":2021,"claim":"Provided a therapeutic strategy by exploiting LEF1's DNA-binding domain for oligonucleotide-PROTAC-mediated degradation.","evidence":"O'PROTAC degradation and ubiquitination assays, reporter, xenograft","pmids":["34397171"],"confidence":"Medium","gaps":["In vivo delivery and selectivity not fully characterized","Off-target effects on other HMG factors not assessed"]},{"year":2023,"claim":"Showed LEF1 drives central memory and anti-exhaustion programs in NKT cells, with translational value for adoptive cell therapy.","evidence":"CRISPR KO and overexpression, Wnt3a treatment, transcriptional profiling, CAR-NKT xenograft","pmids":["36484736"],"confidence":"Medium","gaps":["Direct LEF1 targets driving the memory program not mapped"]},{"year":null,"claim":"It remains unresolved how LEF1's many regulatory inputs and partner-dependent target repertoires are integrated to produce its opposing pro- and anti-tumorigenic and developmental outcomes within a single cell.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model linking partner selection to target choice","Determinants of activator-versus-repressor and β-catenin-dependent-versus-independent modes undefined","Isoform functional distinctions (long/short, ΔN) not mechanistically resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[3,4,9,15,34,35]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,4,9,13,20]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[16]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[16]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[17,20,28]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[20,21]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[27]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,20,23]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,9,15,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,2,4,5,10]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[16,25,27,33]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[16,27]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[9,23,30,34]}],"complexes":[],"partners":["CTNNB1","PITX2","ALX4","PRMT6","ZEB1","ASPN","SP5","FOXP3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UJU2","full_name":"Lymphoid enhancer-binding factor 1","aliases":["T cell-specific transcription factor 1-alpha","TCF1-alpha"],"length_aa":399,"mass_kda":44.2,"function":"Transcription factor that binds DNA in a sequence-specific manner (PubMed:2010090). Participates in the Wnt signaling pathway (By similarity). Activates transcription of target genes in the presence of CTNNB1 and EP300 (By similarity). PIAG antagonizes both Wnt-dependent and Wnt-independent activation by LEF1 (By similarity). TLE1, TLE2, TLE3 and TLE4 repress transactivation mediated by LEF1 and CTNNB1 (PubMed:11266540). Regulates T-cell receptor alpha enhancer function (PubMed:19653274). Required for IL17A expressing gamma-delta T-cell maturation and development, via binding to regulator loci of BLK to modulate expression (By similarity). Acts as a positive regulator of odontoblast differentiation during mesenchymal tooth germ formation, expression is repressed during the bell stage by MSX1-mediated inhibition of CTNNB1 signaling (By similarity). May play a role in hair cell differentiation and follicle morphogenesis (By similarity) Transcriptionally activates MYC and CCND1 expression and enhances proliferation of pancreatic tumor cells Lacks the CTNNB1 interaction domain and may therefore be an antagonist for Wnt signaling Transcriptionally activates the fibronectin promoter, binds to and represses transcription from the E-cadherin promoter in a CTNNB1-independent manner, and is involved in reducing cellular aggregation and increasing cell migration of pancreatic cancer cells","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9UJU2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LEF1","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LEF1","total_profiled":1310},"omim":[{"mim_id":"621396","title":"SPERMATOGENESIS-ASSOCIATED SERINE-RICH PROTEIN 1; SPATS1","url":"https://www.omim.org/entry/621396"},{"mim_id":"621249","title":"ARB2 COTRANSCRIPTIONAL REGULATOR A; ARB2A","url":"https://www.omim.org/entry/621249"},{"mim_id":"621224","title":"ECTODERMAL DYSPLASIA 17 WITH OR WITHOUT LIMB MALFORMATIONS; ECTD17","url":"https://www.omim.org/entry/621224"},{"mim_id":"619987","title":"NOTCH-REGULATED ANKYRIN REPEAT-CONTAINING PROTEIN; NRARP","url":"https://www.omim.org/entry/619987"},{"mim_id":"618909","title":"ILK-ASSOCIATED SERINE/THREONINE PHOSPHATASE; ILKAP","url":"https://www.omim.org/entry/618909"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":325.2}],"url":"https://www.proteinatlas.org/search/LEF1"},"hgnc":{"alias_symbol":["TCF1ALPHA","TCF10","TCF7L3"],"prev_symbol":[]},"alphafold":{"accession":"Q9UJU2","domains":[{"cath_id":"1.10.30.10","chopping":"299-374","consensus_level":"medium","plddt":93.5629,"start":299,"end":374}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UJU2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UJU2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UJU2-F1-predicted_aligned_error_v6.png","plddt_mean":57.03},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LEF1","jax_strain_url":"https://www.jax.org/strain/search?query=LEF1"},"sequence":{"accession":"Q9UJU2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UJU2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UJU2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UJU2"}},"corpus_meta":[{"pmid":"11445543","id":"PMC_11445543","title":"Tcf3 and Lef1 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\"Co-immunoprecipitation, Western blotting, invasion assays, overexpression in intestinal and mammary epithelial cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and functional assays in two cell line systems, single lab\",\n      \"pmids\": [\"9539744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"BMP-4 can activate Lef1 gene expression, and Lef1 expression in epithelium is required for transmission of inductive signals between epithelial and mesenchymal tissues during tooth and whisker organogenesis, as shown by tissue recombination experiments with Lef1-deficient embryos.\",\n      \"method\": \"Tissue recombination of normal and Lef1-null embryos, BMP-4 treatment, targeted gene inactivation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with tissue recombination, replicated across tooth and whisker organ systems\",\n      \"pmids\": [\"8647435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Lef1 requires Wnt signaling and stabilized β-catenin to activate hair-specific keratin genes and control hair differentiation; its HMG DNA-binding domain mediates these effects. A β-catenin-binding-domain-deleted Lef1 (ΔNLef1) instead promotes sebocyte differentiation rather than hair differentiation, demonstrating that Lef1's role in cell-fate decisions in multipotent skin stem cells depends on its β-catenin interaction status.\",\n      \"method\": \"Transgenic mouse overexpression, domain-deletion constructs (ΔNLef1), histological and gene expression analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple domain-deletion constructs tested in vivo, phenotypic readouts replicated across lineages\",\n      \"pmids\": [\"11445543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"LEF-1 physically interacts with the paired-like homeodomain protein Alx4 through Alx4's proline-rich N-terminal domain and LEF-1's HMG-box DNA-binding domain; LEF-1 and Alx4 can bind simultaneously to adjacent sites on the N-CAM promoter and alter its activity, providing a mechanism for mesenchymal-specific LEF-1 activity.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, electrophoretic mobility shift assay (EMSA), luciferase reporter assay, domain-deletion analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding reconstitution with domain mapping, promoter activity assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"11696550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LEF1 directly binds multiple sites in the Dll1 (Delta-like 1) promoter in vitro and in vivo, and LEF1-binding site mutations in the Dll1-LacZ transgene impair its expression in presomitic mesoderm; induced LEF1-β-catenin expression activates endogenous Dll1, establishing that Wnt/LEF1 signaling links to Notch signaling via direct transcriptional regulation of Dll1 in somitogenesis.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), in vitro DNA binding, Dll1-LacZ transgenic reporter with LEF1-site mutations, conditional LEF1-β-catenin induction in fibroblasts\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro and in vivo ChIP, promoter mutagenesis in transgenic mice, functional rescue, multiple orthogonal methods\",\n      \"pmids\": [\"15545629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Loss of Lef1 in mice causes significantly increased apoptosis specifically within the dental epithelium (not mesenchyme), arresting tooth development at the bud stage; FGF4 treatment inhibits apoptosis and rescues tooth development in Lef1-null mice, identifying LEF1 as a critical epithelial survival factor acting upstream of FGF signaling in tooth morphogenesis.\",\n      \"method\": \"Lef1 knockout mouse analysis, TUNEL apoptosis assay, Wnt1-Cre/R26R cell-lineage tracing, FGF4 rescue experiment\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with specific cellular phenotype (apoptosis), rescue experiment, lineage tracing, multiple orthogonal methods\",\n      \"pmids\": [\"15649466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Nrarp stabilizes LEF1 protein by blocking its ubiquitination; Nrarp knockdown in zebrafish phenocopies lef1 knockdown in neural-crest-cell development, and Nrarp independently regulates LEF1 protein turnover (Wnt pathway) separately from its regulation of Notch signaling.\",\n      \"method\": \"Antisense morpholino knockdown in zebrafish, ubiquitination assay, co-immunoprecipitation, Western blotting\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — protein stability and ubiquitination assays combined with in vivo genetic knockdown and phenotypic rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"16228014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LEF1 is a decisive transcription factor in neutrophil granulopoiesis, controlling proliferation, lineage commitment, and granulocytic differentiation by directly regulating target genes C/EBP-α, cyclin D1, c-myc, survivin, and the ELA2 (neutrophil elastase) promoter; myeloid progenitors from severe congenital neutropenia patients show severe downregulation of LEF1 and its targets.\",\n      \"method\": \"Gene expression analysis in primary patient cells, promoter binding assays (ELA2 promoter), functional studies in myeloid progenitors\",\n      \"journal\": \"Annals of the New York Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct promoter binding and functional characterization, supported by patient cell data, but limited methodological detail in this abstract\",\n      \"pmids\": [\"17360796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PITX2 isoforms directly regulate the LEF1 promoter (identified by ChIP); β-catenin synergistically enhances LEF1 promoter activation in combination with PITX2 and Lef1. PITX2 interacts with Lef1 at two sites (the β-catenin-binding domain is dispensable), while β-catenin binds the PITX2 homeodomain and Lef1 binds the PITX2 C-terminal tail; all three proteins can interact simultaneously.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, co-immunoprecipitation, domain-deletion analysis, transgenic mouse Lef1-LacZ reporter\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP, promoter reporter, reciprocal co-IP with domain mapping, in vivo transgenic validation, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"17785445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"LEF1 occupies and activates the androgen receptor (AR) promoter in prostate cancer cells; LEF1 overexpression increases AR expression and enhances growth and invasion, while LEF1 knockdown decreases AR expression and reduces growth and invasion in androgen-independent prostate cancer cells.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), gel shift (EMSA), luciferase reporter assay, siRNA knockdown, overexpression\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP, EMSA, and luciferase reporter all confirm direct AR promoter occupancy and regulation, with functional KD/OE phenotypes, single lab\",\n      \"pmids\": [\"19351848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"BMP2 stimulates expression of a naturally occurring N-terminally truncated Lef1 isoform (Lef1ΔN) driven by an alternative promoter (p2) within intron 3-4 of Lef1, while Wnt3a blocks this expression; Runx2 regulates the p2 promoter activity; stable overexpression of Lef1ΔN in osteoblasts induces osteocalcin and type 1 collagen, promoting terminal differentiation.\",\n      \"method\": \"Promoter reporter assays, Runx2 knockdown/overexpression, stable overexpression of Lef1ΔN, RT-PCR, gene expression analysis\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter assays and functional overexpression with differentiation markers, single lab, multiple methods\",\n      \"pmids\": [\"19650108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The splicing factor CELF2 controls signal-dependent alternative splicing of LEF1 exon 6 by binding two intronic sequences flanking the regulated exon; inclusion of exon 6 is required for optimal TCR-α chain mRNA expression during thymic development and upon T-cell signaling.\",\n      \"method\": \"siRNA knockdown of CELF2, splice-site blocking oligonucleotides, RT-PCR isoform analysis, RNA immunoprecipitation, functional readout of TCR-α expression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (CELF2 KD, direct exon blocking, RNA-IP, functional TCR-α output), mechanistic detail clearly established\",\n      \"pmids\": [\"21444716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LEF-1 translation is regulated by an IRES in its 5' UTR; the LEF1 IRES recruits eIF4A and is controlled by a Bcr-Abl–mTOR–eIF4A axis in CML cells. Inhibition of mTOR (PP242) or eIF4A (hippuristanol) suppresses IRES-mediated LEF1 translation and triggers dissociation of LEF1 mRNA from polyribosomes.\",\n      \"method\": \"IRES reporter assays, polyribosome fractionation, pharmacological inhibition with PP242 and hippuristanol, primary patient CML cell analysis\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — IRES reconstitution, polyribosome analysis, two orthogonal small-molecule inhibitors, primary patient cells, single lab with multiple methods\",\n      \"pmids\": [\"25392452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LEF1 directly binds to the CYLD promoter and suppresses CYLD transcription; upon selenite treatment, LEF1 dissociates from the CYLD promoter, relieving suppression of CYLD (a deubiquitinase), leading to removal of K63-linked ubiquitin chains from RIP1, formation of a death-inducing complex, and caspase-8-dependent apoptosis in colorectal cancer cells.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), siRNA knockdown, Western blotting, xenograft model with immunohistochemistry\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP directly demonstrates LEF1 occupancy at CYLD promoter; dissociation and functional apoptotic readouts, single lab\",\n      \"pmids\": [\"24577083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"miR-34a directly targets the 3'-UTR of LEF1 mRNA to repress its expression, and this miR-34a-LEF1 axis regulates epithelial-mesenchymal transition (EMT), migration, and invasion of prostate cancer cells; luciferase reporter assays confirmed direct 3'-UTR binding.\",\n      \"method\": \"Luciferase reporter assay with LEF1 3'-UTR, miR-34a overexpression/inhibition, migration and invasion assays\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR binding confirmed by luciferase assay, functional invasion phenotype, single lab\",\n      \"pmids\": [\"25587085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LEF1 directly regulates tyrosinase (TYR) gene transcription; LEF1 binds to the core GTTTGAT sequence (-56 to -50) in the TYR promoter as shown by ChIP and EMSA; LEF1 and MITF synergistically transactivate the TYR promoter.\",\n      \"method\": \"Luciferase reporter assay, siRNA knockdown, ChIP, promoter deletion/mutation analysis, EMSA (implied by 'LEF-1 interacts with TYR promoter')\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assays confirm direct promoter occupancy with functional output, single lab\",\n      \"pmids\": [\"26580798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tcf1 and Lef1 possess intrinsic histone deacetylase (HDAC) activity; mutation of five conserved amino acids in the Tcf1 HDAC domain diminishes HDAC activity and impairs suppression of CD4+ lineage genes in CD8+ T cells; Tcf1/Lef1-deficient CD8+ T cells exhibit histone hyperacetylation at lineage-inappropriate loci.\",\n      \"method\": \"HDAC activity assay, domain mutagenesis (5-aa mutation), histone acetylation profiling, conditional knockout mouse model, gene expression analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — intrinsic enzymatic activity demonstrated by in vitro HDAC assay, domain mutagenesis, and in vivo genetic KO with chromatin readout; multiple orthogonal methods\",\n      \"pmids\": [\"27111144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Sp5 and Sp8 bind directly to GC boxes in Wnt target gene enhancers and interact with chromatin-bound Tcf1/Lef1 to facilitate recruitment of β-catenin to select target gene enhancers, acting as gene-specific transcriptional coactivators in a feed-forward loop.\",\n      \"method\": \"ChIP-seq in mouse embryos and ESCs, co-immunoprecipitation, enhancer reporter assays, double-mutant genetic analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq and co-IP show direct interaction and enhancer co-occupancy, single lab\",\n      \"pmids\": [\"26969725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Sox2 acts as a transcriptional repressor that directly binds a functional site in the Lef-1 promoter and suppresses β-catenin-dependent Lef-1 transcription; ChIP and DNA-protein binding (EMSA) confirmed Sox2 occupancy; suppression of Sox2 in SMG placodes relieves repression and enables Wnt-induced Lef-1 expression during submucosal gland morphogenesis.\",\n      \"method\": \"ChIP, EMSA/DNA-protein binding, luciferase reporter assay with promoter mutation, conditional Sox2 deletion, primary airway epithelial cultures\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP plus EMSA plus reporter mutagenesis plus genetic KO all converge on same mechanism, single lab\",\n      \"pmids\": [\"24487391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The m6A methyltransferase METTL3 promotes LEF1 mRNA m6A methylation and increases LEF1 total mRNA levels; METTL3 silencing decreases LEF1 m6A methylation and mRNA level, reduces Wnt/β-catenin signaling activity, and impairs osteosarcoma cell proliferation/invasion; LEF1 overexpression abrogates METTL3 silencing effects.\",\n      \"method\": \"Lentiviral METTL3 silencing, m6A methylation assay, RT-PCR, rescue overexpression of LEF1, functional proliferation/invasion assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m6A assay plus functional rescue, single lab\",\n      \"pmids\": [\"31253399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LEF-1 drives nuclear localization of β-catenin in myeloid leukemia cells; nuclear LEF-1 and β-catenin levels are tightly correlated; LEF-1 knockdown perturbs β-catenin nuclear localization and transcriptional activation, while LEF-1 overexpression promotes nuclear β-catenin accumulation and Wnt-responsive transcription in previously Wnt-unresponsive cells.\",\n      \"method\": \"Nuclear/cytoplasmic proteomic fractionation, β-catenin interactome by mass spectrometry, LEF-1 knockdown and overexpression, reporter assays, primary AML blast analysis\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — interactome MS plus KD/OE functional studies plus primary patient cells, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"30630973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MYC directly activates LEF1 transcription (ChIP-seq confirms MYC occupancy at LEF1 locus); MYC-induced LEF1 causes retention of β-catenin in the nucleus activating the Wnt pathway; LEF1 is required for MYC-induced expression of PPARδ and ACAD9; LEF1 is required for viability of MYC-expressing colon cancer cells.\",\n      \"method\": \"RNA-seq, ChIP-seq, RT-qPCR, Western blotting, siRNA knockdown, metabolomics\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq confirms direct MYC binding to LEF1 locus; multiple functional readouts, single lab\",\n      \"pmids\": [\"31623618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TCF1/LEF1 interact with HTLV-1 Tax protein and inhibit Tax-dependent viral gene expression, NF-κB activation, and AP-1 activation; HTLV-1 replication is suppressed in the presence of TCF1 or LEF1; T-cell activation suppresses TCF1/LEF1 expression, enabling Tax function.\",\n      \"method\": \"Co-immunoprecipitation, reporter assays (NF-κB, AP-1, viral LTR), TCF1/LEF1 overexpression, T-cell activation experiments, STLV-1-infected macaque thymus analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and reporter assays establish direct Tax interaction and functional inhibition, in vivo macaque data support model, single lab\",\n      \"pmids\": [\"25646419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SNAIL1 upregulates LEF1 expression; LEF1 knockout (CRISPR/Cas9) and expression of a β-catenin-binding-deficient LEF1 mutant both impair SNAIL1-induced alternative Wnt/β-catenin target gene expression and cancer cell invasion; LEF1 accounts for ~35% of SNAIL1-induced transcriptional changes in colorectal cancer cells, acting as a strictly β-catenin-dependent downstream effector of SNAIL1.\",\n      \"method\": \"CRISPR/Cas9 LEF1 knockout, LEF1 β-catenin-binding mutant engineering, conditional SNAIL1 expression, transcriptome analysis, invasion assay, xenotransplantation\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO and domain-specific mutant provide clean mechanistic separation, replicated with multiple readouts, single lab\",\n      \"pmids\": [\"31463973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mutant Lef1 (β-catenin-independent) transcriptionally activates Gata6 independently of β-catenin; Gata6 ablation in mutant Lef1-overexpressing mice decreases the proportion of sebaceous gland tumors while increasing total tumor burden and correlating with impaired DNA mismatch repair (decreased Mlh1, Msh2).\",\n      \"method\": \"Transgenic mouse models (mutant Lef1 overexpression, Gata6 conditional KO), in utero lentiviral Gata6 overexpression, gene expression analysis, tumor phenotyping\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic in vivo epistasis with multiple readouts, single lab\",\n      \"pmids\": [\"30886049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Tcf1 and Lef1 are required for immunosuppressive function of regulatory T cells; Tcf1/Lef1-deficient Tregs show reduced expression of signature genes (Ikzf4, Izumo1r) and aberrant upregulation of cytotoxic CD8+ effector genes (Prdm1, Ifng); Tcf1 ChIP-seq reveals co-occupancy of Tcf1 and Foxp3 at key Treg signature and cytotoxic effector gene loci.\",\n      \"method\": \"Conditional Treg-specific Tcf1/Lef1 double KO, transcriptomic analysis, Tcf1 ChIP-seq, colitis protection assay, autoimmunity phenotyping\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq plus conditional KO plus multiple functional assays, mechanistic genome-wide resolution\",\n      \"pmids\": [\"30837262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Asporin (ASPN) directly binds LEF1 and promotes LEF1-mediated transcriptional activation of PTGS2, IL6, and WISP1 promoters independently of β-catenin; ASPN-mediated suppression of gastric cancer cell apoptosis is abolished by LEF1 knockdown or PTGS2 inhibition.\",\n      \"method\": \"Co-immunoprecipitation (ASPN-LEF1 interaction), ChIP (LEF1 promoter occupancy at PTGS2, IL6, WISP1), luciferase reporter assay, siRNA knockdown, overexpression rescue\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding by Co-IP, ChIP and reporter assays, functional rescue, single lab\",\n      \"pmids\": [\"34127813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Tcf1 and Lef1 maintain three-dimensional genome organization in mature CD8+ T cells at multiple scales; Tcf1 directly enforces chromatin interactions and accessibility, promoting formation of interconnected hubs for T cell identity gene promoter–enhancer contacts and repression of non-T lineage genes.\",\n      \"method\": \"Hi-C (chromosome conformation capture), ATAC-seq (chromatin accessibility), Tcf1 ChIP-seq, conditional ablation of Tcf1/Lef1 in mature CD8+ T cells, transcriptomics\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — Hi-C, ATAC-seq, and ChIP-seq provide genome-wide mechanistic resolution, conditional KO in mature cells, multiple orthogonal methods\",\n      \"pmids\": [\"34615872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LEF1 recruits PRMT6 (protein arginine methyltransferase 6) to the CCND1 (cyclin D1) promoter; LEF1 knockdown reduces cyclin D1 expression; PRMT6 knockdown increases G1 cell cycle arrest and decreases proliferation.\",\n      \"method\": \"Co-immunoprecipitation (LEF1-PRMT6 interaction), ChIP (LEF1/PRMT6 at CCND1 promoter), siRNA knockdown, cell cycle analysis\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP confirm interaction and co-occupancy, functional KD readouts, single lab\",\n      \"pmids\": [\"34001852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Oligonucleotide-based PROTACs (O'PROTACs) incorporating LEF1-binding double-stranded DNA sequences can induce proteasomal degradation of LEF1 protein via E3 ubiquitin ligase recruitment, impeding LEF1 transcriptional activity and inhibiting cancer cell growth in vitro and in vivo.\",\n      \"method\": \"O'PROTAC protein degradation assay, ubiquitination assay, transcriptional activity reporter, cell viability and xenograft tumor growth assays\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein degradation demonstrated by multiple functional assays, mechanism dependent on DNA-binding domain, single lab\",\n      \"pmids\": [\"34397171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of Lef1 in Apc-mutant intestinal adenomas markedly increases tumor initiation and cell proliferation, reduces Wnt antagonist expression, increases Myc expression, and promotes ectopic crypt formation, revealing a negative feedback role for ectopic Lef1 that suppresses intestinal tumorigenesis by restricting adenoma cell dedifferentiation.\",\n      \"method\": \"Conditional Lef1 deletion in intestinal stem cells of Apc-mutant mice, tumor burden and proliferation quantification, gene expression analysis\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in multiple Apc-mutant mouse models with quantitative tumor and proliferation readouts, in vivo epistasis\",\n      \"pmids\": [\"34788095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Zeb1 is indirectly recruited to regulatory regions of glioblastoma target genes via interaction with Lef1 (Wnt pathway effector), resulting in transcriptional activation independently of Wnt signaling; this Zeb1/Lef1 co-regulatory mechanism activates invasion-promoting genes including Prex1.\",\n      \"method\": \"Genome-wide Zeb1 ChIP-seq, transcriptomics in glioblastoma stem-like cells, Lef1 ChIP-seq, overexpression and knockdown, in vivo invasion assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq demonstrates genome-wide co-occupancy with functional transcriptional and invasion readouts, single lab\",\n      \"pmids\": [\"29903919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Lef1-expressing fibroblasts in neonatal papillary dermis constitute a transient regenerative cell type; gain-of-function Lef1 expression in adult dermal fibroblasts primes the skin macroenvironment to enhance repair and regeneration of hair follicles with arrector pili muscles, while loss-of-function Lef1 deletion impairs this regenerative capacity.\",\n      \"method\": \"scRNA-seq, gain-of-function and loss-of-function genetic mouse models for Lef1 in fibroblasts, wound healing assays, histological analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic gain- and loss-of-function with specific wound healing and hair follicle regeneration readouts, single lab\",\n      \"pmids\": [\"32990218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LEF1 overexpression in NKT cells drives a central memory transcriptional program, promoting CD62L+ frequency and NKT expansion while limiting exhaustion; CRISPR/Cas9-mediated LEF1 knockout reduces CD62L+ frequency after stimulation; LEF1-expressing CAR-NKTs show superior neuroblastoma tumor control in vivo.\",\n      \"method\": \"CRISPR/Cas9 LEF1 knockout, LEF1 overexpression, Wnt3a ligand treatment, transcriptional profiling, xenograft tumor model\",\n      \"journal\": \"Cancer immunology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO and OE with transcriptional and in vivo functional readouts, single lab\",\n      \"pmids\": [\"36484736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LEF1 inhibition decreases DCLK1-B expression by blocking LEF1 binding to the DCLK1-B promoter in colorectal cancer cells; LEF1/DCLK1-B axis regulates cancer stemness and self-renewal; niclosamide blocks LEF1-DCLK1-B promoter binding and eradicates cancer stem-like cells.\",\n      \"method\": \"ChIP (LEF1 occupancy at DCLK1-B promoter), siRNA/shRNA knockdown, luciferase reporter, sphere formation assays, xenograft model\",\n      \"journal\": \"Clinical cancer research : an official journal of the American Association for Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms direct promoter binding; functional cancer stemness assays, single lab\",\n      \"pmids\": [\"30446587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LEF1 directly activates transcription of the TGF-β pathway gene ID1 by binding to its promoter in esophageal squamous cell carcinoma; ASPN-mediated LEF1-ID1 activation promotes cancer stem cell-like properties and tumorigenicity.\",\n      \"method\": \"Luciferase reporter assay, ChIP-qPCR (LEF1 binding at ID1 promoter), RNA-seq, siRNA knockdown\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay confirm direct ID1 promoter binding, single lab\",\n      \"pmids\": [\"31296250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"β-catenin/LEF1 complex directly binds the IGF-IIR promoter (putative LEF1 consensus site identified) and activates IGF-IIR expression under Ang-II-induced hypertensive conditions in cardiac cells, promoting cardiac hypertrophy.\",\n      \"method\": \"Luciferase reporter assay, immunoprecipitation, nuclear-cytosolic protein fractionation, Western blot in H9c2 cells and SHR rat tissue\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — putative binding site with reporter assay and IP, limited direct ChIP confirmation, single lab\",\n      \"pmids\": [\"31480672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Differential expression of long and short LEF1 isoforms is a key regulatory mechanism of cellular senescence; LEF1 dysregulation is associated with idiopathic pulmonary fibrosis; this isoform balance was identified computationally and validated in cell culture and human lung tissue.\",\n      \"method\": \"Transcriptome comparative analysis, cell culture senescence assays, RT-qPCR in human lung tissue samples, computational transcriptional network analysis\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — isoform functional distinction supported mainly by expression profiling and cell culture, limited mechanistic depth on how isoforms differ functionally\",\n      \"pmids\": [\"37961030\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LEF1 is an HMG-box transcription factor that functions as the primary nuclear effector of canonical Wnt/β-catenin signaling: it binds specific DNA sequences (through its HMG domain) to activate target genes (including Dll1, AR, cyclin D1, TYR, ID1, DCLK1-B, and miR-17-92 cluster) or repress others (CYLD), recruits β-catenin as a co-activator, and is itself regulated at multiple levels including IRES-mediated translation (controlled by Bcr-Abl/mTOR/eIF4A), alternative splicing by CELF2, protein stability via Nrarp-mediated protection from ubiquitination, isoform-specific promoter usage regulated by BMP2/Runx2, m6A methylation by METTL3, and transcriptional repression by Sox2; it also possesses intrinsic HDAC activity required for silencing lineage-inappropriate genes in T cells, and physically interacts with diverse partners including Alx4, PITX2, PRMT6, Zeb1, ASPN, and Tax to modulate context-specific transcriptional outputs across development, immunity, and cancer.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LEF1 is an HMG-box DNA-binding transcription factor that serves as a nuclear effector of Wnt/β-catenin signaling, directing context-specific transcriptional programs across organogenesis, hematopoiesis, immunity, and cancer [#2, #4, #20]. Its HMG domain mediates sequence-specific promoter occupancy, and its β-catenin-binding domain determines cell-fate output: β-catenin-competent LEF1 drives hair differentiation and Wnt target activation whereas β-catenin-binding-deficient or N-terminally truncated forms redirect lineage decisions toward sebocytes and osteoblasts [#2, #10]. LEF1 directly binds and activates a broad set of target promoters — Dll1 linking Wnt to Notch in somitogenesis, the androgen receptor, tyrosinase (synergizing with MITF), ID1, DCLK1-B, and CCND1 — and represses CYLD, whose derepression upon LEF1 dissociation triggers caspase-8-dependent apoptosis [#4, #9, #15, #35, #34, #28, #13]. In T cells LEF1 (with TCF1) carries intrinsic histone deacetylase activity required to silence lineage-inappropriate genes and, more broadly, enforces three-dimensional genome organization and promoter–enhancer hubs that maintain T-cell identity, regulatory T-cell function, and memory programs [#16, #27, #25, #33]. LEF1 partners beyond β-catenin to diversify its outputs, interacting with homeodomain proteins Alx4 and PITX2, the methyltransferase PRMT6, the transcription factor Zeb1, and the matrix protein asporin to drive β-catenin-independent transcription [#3, #8, #28, #31, #26]. LEF1 itself is regulated at every level: transcriptionally by MYC, SNAIL1, BMP2/Runx2-driven alternative promoter usage, and Sox2-mediated repression; post-transcriptionally by IRES-mediated translation under a Bcr-Abl/mTOR/eIF4A axis, CELF2-controlled alternative splicing, miR-34a, and METTL3-dependent m6A methylation; and post-translationally by Nrarp-mediated protection from ubiquitination [#21, #23, #10, #18, #12, #11, #14, #19, #6]. In tumorigenesis its role is context-dependent — promoting prostate, gastric, and colorectal cancer phenotypes yet acting as a negative-feedback suppressor of intestinal adenoma dedifferentiation — and its DNA-binding domain has been exploited for targeted degradation by oligonucleotide PROTACs [#9, #26, #23, #30, #29].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established LEF1 as an essential epithelial mediator of inductive tissue interactions during organogenesis, placing it downstream of BMP signaling.\",\n      \"evidence\": \"Tissue recombination of Lef1-null embryos and BMP-4 treatment in tooth and whisker systems\",\n      \"pmids\": [\"8647435\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct target genes mediating the inductive signal not identified\", \"Relationship to Wnt/β-catenin not yet addressed\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Linked LEF1 to β-catenin and upstream ILK/ECM signaling, showing LEF1/β-catenin complex formation drives nuclear β-catenin and transcription.\",\n      \"evidence\": \"Co-IP, Western blot, and invasion assays in intestinal and mammary epithelial cells\",\n      \"pmids\": [\"9539744\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional targets not defined\", \"Single-lab cell-line system\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrated that LEF1's β-catenin interaction status dictates cell-fate decisions and that homeodomain partners confer tissue specificity.\",\n      \"evidence\": \"Transgenic mouse domain-deletion (ΔNLef1) constructs; Co-IP/EMSA/reporter with Alx4\",\n      \"pmids\": [\"11445543\", \"11696550\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide target repertoire of β-catenin-independent LEF1 not mapped\", \"Mechanism of partner selection in vivo unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed LEF1 directly bridges Wnt to Notch signaling by transcriptionally activating Dll1 in somitogenesis.\",\n      \"evidence\": \"ChIP, promoter mutagenesis in Dll1-LacZ transgenic mice, inducible LEF1-β-catenin in fibroblasts\",\n      \"pmids\": [\"15545629\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cooperating factors at the Dll1 promoter not defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified LEF1 as an epithelial survival factor acting upstream of FGF signaling, explaining the developmental arrest phenotype.\",\n      \"evidence\": \"Lef1 KO mouse, TUNEL, lineage tracing, FGF4 rescue in tooth development\",\n      \"pmids\": [\"15649466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct anti-apoptotic LEF1 targets not identified\", \"Connection between LEF1 and FGF4 transcription not mapped\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined a post-translational control point for LEF1 abundance via Nrarp-mediated protection from ubiquitination.\",\n      \"evidence\": \"Zebrafish morpholino knockdown, ubiquitination assay, Co-IP in neural crest development\",\n      \"pmids\": [\"16228014\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase responsible for LEF1 ubiquitination not identified\", \"Whether Nrarp acts directly on LEF1 or via adaptors unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established LEF1 as a decisive transcriptional regulator of neutrophil granulopoiesis controlling proliferation and differentiation genes.\",\n      \"evidence\": \"Patient myeloid progenitor analysis and ELA2 promoter binding in severe congenital neutropenia\",\n      \"pmids\": [\"17360796\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Limited methodological detail in abstract\", \"Direct versus indirect regulation of listed targets not fully resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed reciprocal regulation between LEF1 and PITX2, with simultaneous tripartite assembly of LEF1, PITX2, and β-catenin.\",\n      \"evidence\": \"ChIP, reporter assays, reciprocal Co-IP with domain mapping, transgenic Lef1-LacZ\",\n      \"pmids\": [\"17785445\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of the tripartite complex to specific developmental loci unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Implicated LEF1 in cancer by direct activation of the androgen receptor promoter driving prostate cancer growth and invasion.\",\n      \"evidence\": \"ChIP, EMSA, reporter, siRNA knockdown and overexpression in androgen-independent prostate cancer cells\",\n      \"pmids\": [\"19351848\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream control of LEF1 in this context not addressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed isoform-specific promoter usage (Lef1ΔN via the p2 promoter) under BMP2/Runx2 control redirects LEF1 toward osteoblast differentiation.\",\n      \"evidence\": \"Promoter reporter, Runx2 KD/OE, stable Lef1ΔN overexpression in osteoblasts\",\n      \"pmids\": [\"19650108\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous Lef1ΔN target gene repertoire not defined\", \"β-catenin dependence of Lef1ΔN not directly tested here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified CELF2-mediated signal-dependent alternative splicing of LEF1 exon 6 as a regulator of TCR-α expression in thymocytes.\",\n      \"evidence\": \"CELF2 knockdown, splice-blocking oligos, RNA-IP, RT-PCR, functional TCR-α readout\",\n      \"pmids\": [\"21444716\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of exon 6 inclusion on LEF1 protein activity not fully defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established translational control of LEF1 via a 5'UTR IRES regulated by a Bcr-Abl/mTOR/eIF4A axis in CML.\",\n      \"evidence\": \"IRES reporters, polyribosome fractionation, PP242 and hippuristanol inhibition, primary CML cells\",\n      \"pmids\": [\"25392452\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"IRES trans-acting factors beyond eIF4A not enumerated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined LEF1 as a transcriptional repressor of CYLD, linking its dissociation to caspase-8-dependent apoptosis in colorectal cancer.\",\n      \"evidence\": \"ChIP, siRNA knockdown, Western blot, xenograft with IHC under selenite treatment\",\n      \"pmids\": [\"24577083\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism driving LEF1 dissociation upon selenite not defined\", \"Co-repressors at the CYLD promoter not identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mapped two layers of LEF1 control in cancer: miR-34a 3'UTR repression governing EMT, and direct LEF1/MITF synergy at the tyrosinase promoter.\",\n      \"evidence\": \"Luciferase 3'UTR reporter and invasion assays; ChIP/EMSA and reporter at TYR core sequence\",\n      \"pmids\": [\"25587085\", \"26580798\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of miR-34a–LEF1 axis not established\", \"Structural basis of LEF1/MITF cooperativity unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovered an intrinsic HDAC activity in TCF1/LEF1 required to silence lineage-inappropriate genes, expanding LEF1 beyond a DNA-binding scaffold.\",\n      \"evidence\": \"In vitro HDAC assay, 5-aa domain mutagenesis, histone acetylation profiling, conditional KO\",\n      \"pmids\": [\"27111144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural identity of the catalytic site not resolved\", \"Substrate specificity beyond bulk histone acetylation not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed gene-specific coactivators (Sp5/Sp8) recruit β-catenin to chromatin-bound LEF1, and Sox2 directly represses Lef1 transcription, defining input control of LEF1 activity.\",\n      \"evidence\": \"ChIP-seq, Co-IP, enhancer reporters; Sox2 ChIP/EMSA/reporter and conditional deletion in airway epithelium\",\n      \"pmids\": [\"26969725\", \"24487391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of Sp5/Sp8 feed-forward loop across LEF1 targets unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified multiple new upstream regulators (MYC, SNAIL1, METTL3 m6A) that converge on LEF1 to sustain Wnt/β-catenin output and cancer phenotypes.\",\n      \"evidence\": \"ChIP-seq (MYC), CRISPR KO and β-catenin-binding mutant (SNAIL1), m6A assay and rescue (METTL3) in colon, colorectal and osteosarcoma cells\",\n      \"pmids\": [\"31623618\", \"31463973\", \"31253399\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of each input in a single cellular context not compared\", \"m6A reader mediating METTL3 effect not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined LEF1 as a driver of β-catenin nuclear localization in leukemia, formalizing its role in nucleating Wnt-responsive transcription.\",\n      \"evidence\": \"Nuclear/cytoplasmic fractionation, β-catenin interactome MS, KD/OE, primary AML blasts\",\n      \"pmids\": [\"30630973\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which LEF1 retains β-catenin nuclear not structurally resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established β-catenin-independent partnerships (Zeb1, ASPN) that redirect LEF1 to non-canonical invasion and stemness gene programs.\",\n      \"evidence\": \"Zeb1/Lef1 ChIP-seq in glioblastoma; ASPN-LEF1 Co-IP, ChIP and reporters at PTGS2/IL6/WISP1 and ID1 in gastric and esophageal cancers\",\n      \"pmids\": [\"29903919\", \"34127813\", \"31296250\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How partner binding overrides β-catenin requirement mechanistically unclear\", \"Direct versus indirect recruitment in some cases not fully separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended LEF1 function in immunity to regulatory T-cell suppression and to inhibition of HTLV-1 Tax-dependent viral transcription.\",\n      \"evidence\": \"Treg-specific Tcf1/Lef1 double KO with Tcf1 ChIP-seq; Tax Co-IP and viral LTR/NF-κB/AP-1 reporter assays\",\n      \"pmids\": [\"30837262\", \"25646419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Lef1-specific (vs Tcf1) contributions not always separated\", \"Direct chromatin targets in Tregs are mostly Tcf1 ChIP-derived\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated LEF1 enforces 3D genome architecture and that it recruits PRMT6 to the CCND1 promoter, broadening its chromatin-organizing and cofactor-recruiting roles.\",\n      \"evidence\": \"Hi-C, ATAC-seq, Tcf1 ChIP-seq in CD8+ T cells; LEF1-PRMT6 Co-IP and ChIP at CCND1\",\n      \"pmids\": [\"34615872\", \"34001852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct DNA-contact contribution of LEF1 versus TCF1 to genome folding not isolated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed a context-dependent tumor-suppressive negative-feedback role for ectopic LEF1 in Apc-mutant intestinal adenomas, complicating its oncogenic portrait.\",\n      \"evidence\": \"Conditional Lef1 deletion in Apc-mutant mouse intestine with tumor and proliferation quantification\",\n      \"pmids\": [\"34788095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the negative feedback (target genes) not fully defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided a therapeutic strategy by exploiting LEF1's DNA-binding domain for oligonucleotide-PROTAC-mediated degradation.\",\n      \"evidence\": \"O'PROTAC degradation and ubiquitination assays, reporter, xenograft\",\n      \"pmids\": [\"34397171\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo delivery and selectivity not fully characterized\", \"Off-target effects on other HMG factors not assessed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed LEF1 drives central memory and anti-exhaustion programs in NKT cells, with translational value for adoptive cell therapy.\",\n      \"evidence\": \"CRISPR KO and overexpression, Wnt3a treatment, transcriptional profiling, CAR-NKT xenograft\",\n      \"pmids\": [\"36484736\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct LEF1 targets driving the memory program not mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how LEF1's many regulatory inputs and partner-dependent target repertoires are integrated to produce its opposing pro- and anti-tumorigenic and developmental outcomes within a single cell.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model linking partner selection to target choice\", \"Determinants of activator-versus-repressor and β-catenin-dependent-versus-independent modes undefined\", \"Isoform functional distinctions (long/short, ΔN) not mechanistically resolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [3, 4, 9, 15, 34, 35]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 4, 9, 13, 20]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [17, 20, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [20, 21]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 20, 23]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 9, 15, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 2, 4, 5, 10]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16, 25, 27, 33]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [16, 27]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [9, 23, 30, 34]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CTNNB1\", \"PITX2\", \"ALX4\", \"PRMT6\", \"ZEB1\", \"ASPN\", \"SP5\", \"FOXP3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}