{"gene":"RUNX3","run_date":"2026-06-10T07:46:28","timeline":{"discoveries":[{"year":2002,"finding":"RUNX3 is a downstream effector of TGF-β signaling in gastric epithelial cells; Runx3-null mouse gastric mucosa shows hyperplasia due to stimulated proliferation and suppressed apoptosis with resistance to TGF-β growth-inhibitory and apoptosis-inducing actions. A Runt-domain mutation (R122C) abolishes tumor-suppressive function.","method":"Runx3 knockout mice, primary culture TGF-β response assays, nude mouse tumorigenicity assay, site-directed mutagenesis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal in vivo and in vitro methods, widely replicated, foundational study","pmids":["11955451"],"is_preprint":false},{"year":2003,"finding":"Runx3 is required for CD8+ T cell maturation in the thymus; Runx3-deficient mice show impaired CD8 T cell lineage decisions with aberrant CD4 expression on peripheral CD8 T cells and reduced cytotoxic activity. Genetic epistasis with Runx1 (Runx3-/-;Runx1+/-) results in complete absence of single-positive CD8+ T cells, indicating both act as transcriptional repressors of CD4 during T cell lineage decisions.","method":"Runx3 knockout mice, compound Runx3/Runx1 mutants, flow cytometry, in vitro cytotoxicity assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with defined cellular phenotype, epistasis analysis, replicated in multiple studies","pmids":["12796513"],"is_preprint":false},{"year":2010,"finding":"Src kinase phosphorylates RUNX3 at tyrosine residues, causing cytoplasmic mislocalization; Src knockdown or kinase inhibition causes re-localization of RUNX3 to the nucleus, identifying Src-mediated tyrosine phosphorylation as a mechanism of RUNX3 inactivation in gastric and breast cancer.","method":"Overexpression of Src, co-immunoprecipitation, siRNA knockdown of Src, chemical kinase inhibition, subcellular fractionation/immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (co-IP, siRNA, inhibitor) in single lab with clear mechanistic readout","pmids":["20100835"],"is_preprint":false},{"year":2017,"finding":"Runx3 programs CD8+ T cell tissue residency (TRM cells) by supporting expression of tissue-residency genes and suppressing genes associated with tissue egress; Runx3-deficient CD8+ TILs fail to accumulate in tumors, while Runx3 overexpression enhances tumor-specific CD8+ T cell abundance and delays tumor growth.","method":"Pooled in vivo RNAi screen, Runx3 conditional knockout, adoptive T cell transfer, gene expression profiling, chromatin accessibility (ATAC-seq)","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo RNAi screen, KO and OE experiments, multiple orthogonal methods, published in high-impact journal","pmids":["29211713"],"is_preprint":false},{"year":2017,"finding":"Runx3 plays a critical role at the restriction (R)-point in the G1-S transition; Runx3 transiently forms a complex with pRb and Brd2 to induce p21 (Cdkn1a) expression. Cyclin D-CDK4/6 promotes dissociation of this complex, turning off p21. Runx3-/- MEFs show dysregulated R-point and tumor formation in nude mice.","method":"Runx3 knockout MEFs, co-immunoprecipitation, luciferase reporter, nude mouse tumorigenicity, reconstitution experiments with oncogenic K-Ras","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — complex reconstitution (Co-IP of three-protein complex), KO phenotype, in vivo tumorigenicity, multiple methods single lab","pmids":["28846108"],"is_preprint":false},{"year":2012,"finding":"RUNX3 is a component of the MST/Hippo signaling pathway; SAV1/WW45 facilitates close association between MST2 and RUNX3, and MST2 stimulates SAV1-RUNX3 interaction. RUNX3 knockdown abolishes MST/Hpo-mediated cell death, identifying RUNX3 as an endpoint effector of this pathway.","method":"Co-immunoprecipitation, siRNA knockdown, cell death assays","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — reciprocal Co-IP, siRNA functional assay, single lab","pmids":["21678419"],"is_preprint":false},{"year":2020,"finding":"Under hypoxia, G9a (KMT) methylates RUNX3 at K129 and K171 via interaction with the Runt domain; this methylation inactivates RUNX3 transactivation by reducing interactions with CBFβ and p300 cofactors and reducing p300-mediated acetylation of RUNX3, which is involved in nuclear import via importin-α1.","method":"Co-immunoprecipitation, in vitro methylation assay, site-directed mutagenesis, immunofluorescence localization, cell proliferation assays","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro methylation assay with mutagenesis, multiple binding partner experiments, single lab with multiple orthogonal methods","pmids":["33116296"],"is_preprint":false},{"year":2019,"finding":"RUNX3 directly interacts with GLI1 and promotes its ubiquitination (via E3 ligase β-TrCP), thereby inhibiting Hedgehog signaling to suppress stemness and metastasis in colorectal cancer.","method":"Co-immunoprecipitation, ubiquitination assay, knockdown/overexpression experiments, correlation analysis in CRC tissues","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus ubiquitination assay, single lab","pmids":["31278361"],"is_preprint":false},{"year":2019,"finding":"RUNX3 induces apoptosis in colorectal cancer cells via TRAIL by inhibiting SOD3 transcription (binding to SOD3 promoter), thereby increasing ROS and ER stress, which upregulates CHOP and DR5.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter, overexpression/knockdown, ROS measurement, flow cytometry, xenograft model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional assays, single lab, multiple methods","pmids":["30692634"],"is_preprint":false},{"year":2007,"finding":"Runx3 directly binds to the Osterix promoter at a specific RUNX-responsive element (AGTGGTT, -713 to -707 bp) and negatively regulates Osterix expression in dental pulp cells, as demonstrated by EMSA and ChIP assays; mutation of this site abolishes repression.","method":"Luciferase reporter assay, electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation (ChIP), site-directed mutagenesis","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro DNA-binding assay with mutagenesis plus in vivo ChIP, multiple orthogonal methods, single lab","pmids":["17352693"],"is_preprint":false},{"year":2007,"finding":"Runx3 regulates both early and late stages of chondrocyte differentiation; Runx3 gain-of-function and loss-of-function alter markers of chondrocyte maturation, and Runx3 transcriptionally inhibits Runx1 expression in chondrocytes.","method":"siRNA knockdown, overexpression, luciferase reporter assay, real-time RT-PCR, immunohistochemistry in mouse embryos","journal":"Journal of bone and mineral research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — gain and loss of function with reporter assay, single lab","pmids":["17488194"],"is_preprint":false},{"year":2006,"finding":"RUNX3 negatively regulates CD36 expression in myeloid cells by directly binding two functional RUNX-binding elements in the CD36 gene proximal regulatory region in vitro and in vivo; RUNX3 overexpression in myeloid cells drastically diminishes CD36 expression.","method":"Luciferase reporter assay, EMSA, chromatin immunoprecipitation (ChIP), overexpression in myeloid cells","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP in vivo occupancy plus EMSA and reporter, single lab","pmids":["16887969"],"is_preprint":false},{"year":2006,"finding":"Runx3 is required for development of skin dendritic epidermal T cells (DETCs) by regulating expression of the αEβ7 integrin CD103 and IL-2Rβ, affecting proliferation and epithelial retention of DETC precursors.","method":"Runx3 knockout mice, flow cytometry, gene expression analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined cellular phenotype and specific target gene regulation, single lab","pmids":["17222403"],"is_preprint":false},{"year":2014,"finding":"Runx3 cooperates with ETS and T-box transcription factors to drive the IL-15-mediated transcription program during natural killer cell activation; loss of Runx3 impairs IL-15-dependent accumulation of mature NK cells in vivo and uterine NK cells are completely absent in pregnant Runx3-/- mice.","method":"Runx3 knockout mice, ChIP-seq, RNA-seq/differential gene expression analysis, in vivo NK cell quantification","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus transcriptome analysis and in vivo KO phenotype, multiple orthogonal methods, single lab","pmids":["24421391"],"is_preprint":false},{"year":2013,"finding":"Runx3 regulates a transcriptional program in CD8+ T and NK cells; Runx3-bound genomic regions are enriched for RUNX and ETS motifs and overlap with T-bet/p300-bound enhancer regions; IL-2 activation expands the set of Runx3-regulated genes to include proliferation, cytotoxicity, migration and cytokine production genes.","method":"ChIP-seq, transcriptome analysis of wild-type vs. Runx3-/- primary cells","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-seq combined with transcriptome analysis in primary cells, single lab","pmids":["24236182"],"is_preprint":false},{"year":2008,"finding":"RUNX3 transcription is repressed by the AML fusion proteins RUNX1-ETO (t(8;21)) and CBFβ-MYH11 (inv(16)) acting directly or indirectly through two conserved RUNX binding sites in the RUNX3 P1 promoter, not by P2 methylation; ectopic expression of fusion proteins also inhibits endogenous RUNX3 expression in vitro.","method":"Luciferase reporter assay, promoter analysis, ectopic expression in cell lines, methylation analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — promoter reporter with site analysis, in vitro expression system, single lab","pmids":["18663147"],"is_preprint":false},{"year":2009,"finding":"RUNX3 represses RUNX1 expression in proliferating human B cells; this repression of RUNX1 by RUNX3 is required to allow cell proliferation at a key B-cell developmental stage.","method":"Expression analysis in B cell lines, functional studies of RUNX1/RUNX3 interplay","journal":"Journal of cellular physiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional observation in cell lines, limited mechanistic detail in abstract, single lab","pmids":["19603429"],"is_preprint":false},{"year":2007,"finding":"Runx3 physically interacts with DNA repair protein Ku70 (and Ku80) in vivo and in vitro; the interaction requires amino acids 241-322 of Runx3 (transcriptional activation domain) and amino acids 1-116 of Ku70; Ku70 knockdown enhances Runx3-mediated p21 transcriptional activation.","method":"Affinity purification/mass spectrometry, His-tag pull-down, co-immunoprecipitation, immunofluorescence, siRNA knockdown","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro pull-down with domain mapping plus in vivo Co-IP and functional consequence, single lab","pmids":["17662272"],"is_preprint":false},{"year":2012,"finding":"RUNX3 negatively regulates ICAM-3 expression during macrophage differentiation; RUNX3 occupies RUNX cognate sequences in the ICAM-3 promoter in vivo, and siRNA-mediated reduction of RUNX3 increases ICAM-3 mRNA levels; RUNX3 cooperates with Ets and C/EBP family factors at the ICAM-3 promoter.","method":"Luciferase reporter assay, ChIP, siRNA knockdown, protein expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ChIP occupancy plus reporter and siRNA functional validation, single lab","pmids":["22479382"],"is_preprint":false},{"year":2017,"finding":"RUNX3 directly binds the promoter of miR-182 (by ChIP) and regulates its expression; miR-182 targets HOXA9 (validated by luciferase assay), establishing a RUNX3→miR-182→HOXA9 axis that inhibits gastric cancer cell proliferation, migration, and invasion.","method":"ChIP assay, luciferase reporter assay, qRT-PCR, Western blot, EdU proliferation, Transwell assay, xenograft mouse model","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase reporter, functional readout, single lab","pmids":["29054094"],"is_preprint":false},{"year":2017,"finding":"RUNX3 loss leads to transcriptional downregulation of the redox regulator HO-1 (HMOX1), which elevates oxidative DNA damage and causes DNA double-strand breaks, triggering cellular senescence and acquisition of the senescence-associated secretory phenotype (SASP) under TGFβ stimulation.","method":"RUNX3 loss-of-function in cancer cells, gene expression analysis, DNA damage assays, ROS measurement, co-relation with TGFβ gene signature in tumor datasets","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO/KD with mechanistic pathway validation, multiple methods, single lab","pmids":["29074538"],"is_preprint":false},{"year":2015,"finding":"Runx3 is expressed in osteoblast precursors and Runx3-deficient osteoblast-specific (Col1α1-cre) mice develop severe congenital osteopenia due to decreased osteoblast numbers from diminished proliferation; Runx3-null osteoblast transcriptomes show decreased osteoblastic markers and increased Notch signaling components.","method":"Conditional knockout mice (osteoblast-specific Cre), bone histomorphometry, primary osteoblast culture, transcriptome analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with histomorphometry and transcriptome, multiple orthogonal methods, single lab","pmids":["25605327"],"is_preprint":false},{"year":2017,"finding":"MYC directly binds the RUNX3 enhancer region (shown by ChIP-qPCR) and positively regulates RUNX3 transcription in NK/T-cell lymphoma (NKTL); co-transfection of MYC with RUNX3 enhancer reporter activates transcription; MYC inhibition (JQ1) causes downregulation of both MYC and RUNX3.","method":"ChIP-qPCR, luciferase reporter assay, JQ1 treatment, ectopic MYC expression rescue experiment","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter and rescue, single lab","pmids":["28119527"],"is_preprint":false},{"year":2020,"finding":"RUNX3 overexpression in Tet2-deficient hematopoietic stem/progenitor cells suppresses Runx1 expression and its target genes (Cebpa, Csf1r) by binding Runx1-regulatory regions and remodeling chromatin, while activating Myc target genes; this drives MDS-like transformation in vivo.","method":"RUNX3-overexpressing Tet2-deficient mouse model, ChIP-seq, RNA-seq, in vivo hematopoiesis analysis","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model with ChIP-seq and transcriptome, multiple orthogonal methods, single lab","pmids":["32341038"],"is_preprint":false},{"year":2021,"finding":"Runx1 and Runx3 are co-expressed in single pro-T cells, bind highly overlapping genomic sites, and have redundant/collaborative functions in T-lineage gene activation and progenitor gene repression during T cell commitment; they shift binding sites extensively during commitment, with functionally distinct sites characterized by different co-factor binding patterns.","method":"Single and double Runx CRISPR/Cas9 knockouts, ChIP-seq, RNA-seq, stage-specific analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — double KO epistasis, genome-wide ChIP-seq, transcriptomics, multiple orthogonal methods","pmids":["33479171"],"is_preprint":false},{"year":1999,"finding":"AML2/RUNX3 protein in hematopoietic cells is a nuclear serine phosphoprotein associated with the nuclear matrix; its expression is induced by all-trans retinoic acid, 13-cis-RA, and 9-cis-RA through the RARα-specific signaling pathway (not RXR), as demonstrated using selective agonists/antagonists.","method":"Western blot, nuclear fractionation, pharmacological induction with retinoid receptor-selective ligands and antagonists","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — pharmacological dissection with selective agonists/antagonists and nuclear matrix fractionation, single lab","pmids":["10419474"],"is_preprint":false},{"year":2015,"finding":"Nr4a1 directly suppresses Runx3 expression in CD8+ T cells by recruiting the corepressor CoREST to the Runx3 locus; loss of Nr4a1 results in increased Runx3 expression in thymocytes and a 2-fold increase in CD8+ T cell frequency.","method":"Nr4a1 knockout mice, ChIP (Nr4a1 binding to Runx3 promoter with CoREST), flow cytometry","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP showing direct occupancy plus KO phenotype, single lab","pmids":["25762306"],"is_preprint":false},{"year":2014,"finding":"RUNX3 inhibits survivin expression by directly binding to a RUNX3-binding site in the survivin gene promoter; RUNX3-R122C mutation (Runt domain) abolishes binding and has no effect on survivin promoter activity, demonstrating DNA-binding dependence.","method":"Luciferase reporter assay, ChIP, overexpression/knockdown, site-directed mutagenesis (R122C), apoptosis assays","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter with mutagenesis, single lab","pmids":["24636883"],"is_preprint":false},{"year":2013,"finding":"Runx3 binds the TSP-1 (thrombospondin-1) promoter and stimulates its transcriptional activity and protein expression in melanoma cells; Runx3 expression dramatically increases TSP-1 at both transcriptional and translational levels.","method":"Promoter luciferase reporter assay, ChIP, qRT-PCR, Western blot, overexpression","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assay, single lab","pmids":["23846726"],"is_preprint":false},{"year":2023,"finding":"RUNX3 deficiency in liver sinusoidal endothelial cells (LSECs) leads to IL-6/JAK/STAT3 pathway activation and LSEC dysfunction; RUNX3-deficient LSECs secrete LRG1, which activates hepatic stellate cells via TGFBR1-SMAD2/3 signaling in a paracrine manner, driving liver fibrosis.","method":"Endothelial-specific Runx3 knockout mice, single-cell RNA-seq, co-culture experiments, mechanistic pathway analysis (IL-6/JAK/STAT3, TGFBR1-SMAD2/3)","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO plus scRNA-seq and coculture mechanistic experiments, single lab","pmids":["39042837"],"is_preprint":false},{"year":2022,"finding":"Runx3 directly regulates lubricin and aggrecan as transcriptional target genes in articular chondrocytes; Runx3-knockout mice show accelerated osteoarthritis after surgical induction with decreased lubricin and aggrecan; intra-articular Runx3 adenovirus ameliorates osteoarthritis.","method":"Runx3 conditional knockout mice, comprehensive transcriptional analyses, adenovirus rescue, surgical osteoarthritis model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo KO plus transcriptional target identification and adenoviral rescue, multiple orthogonal methods, single lab","pmids":["36261443"],"is_preprint":false},{"year":2023,"finding":"RUNX3 induces ferroptosis in gallbladder cancer cells by activating ING1 transcription (validated by dual-luciferase reporter and ChIP assay), thereby repressing SLC7A11 in a p53-dependent manner; RUNX3 promoter methylation by DNMT1 suppresses this ferroptosis pathway.","method":"Dual-luciferase reporter assay, ChIP, gain/loss-of-function assays in vitro and in vivo, bisulfite sequencing PCR","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter and functional ferroptosis assays, single lab","pmids":["37156453"],"is_preprint":false},{"year":2019,"finding":"Runx3 is required for maintenance of cell identity of a muscle-selective subgroup of proprioceptive sensory neurons (PSNs) and controls sensorimotor connections between PSNs and motor neurons; muscle-derived neurotrophin 3 (NT3) signaling is necessary for maintenance of RUNX3 expression in PSNs.","method":"Conditional Runx3 inactivation in PSNs after peripheral innervation, anatomical tracing, electrophysiology, genetic ablation","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with electrophysiology and anatomical analysis, single lab","pmids":["31575648"],"is_preprint":false},{"year":2023,"finding":"Runx3-expressing vagal sensory neurons (subsets also expressing Prox2) form intraganglionic laminar endings in the esophagus and stomach; genetic ablation of Prox2 and Runx3 neurons demonstrates their essential role in esophageal peristalsis in freely behaving mice.","method":"Genetically guided anatomical tracing, optogenetics, electrophysiology, genetic ablation","journal":"Neuron","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — optogenetics, electrophysiology, and genetic ablation with direct functional readout, single study","pmids":["37192624"],"is_preprint":false},{"year":2019,"finding":"NO•-induced IDO1/Kynurenine/AHR signaling in pancreatic cancer is mediated by RUNX3 transcription factor, establishing a NO•/RUNX3/Kynurenine metabolic axis that enhances disease aggressiveness.","method":"Gene expression correlation analysis, NO• donor treatment, IDO1/kynurenine measurements, mechanistic pathway analysis in pancreatic cancer cell lines","journal":"International journal of cancer","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacological treatment with expression correlation, limited mechanistic depth in abstract, single lab","pmids":["31609478"],"is_preprint":false},{"year":2019,"finding":"RUNX1 and RUNX3 physically interact with YAP and act as negative regulators of YAP oncogenic function in mammary epithelial cells; RUNX1/RUNX3 inhibit YAP-mediated migration and stemness in an interaction-dependent manner and co-regulate YAP-mediated gene expression.","method":"Co-immunoprecipitation, overexpression/knockdown, migration assay, mammosphere formation","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP showing interaction, functional assays with interaction-dependence tested, single lab","pmids":["29581836"],"is_preprint":false},{"year":2014,"finding":"RUNX3 binds to EWS/FLI via its Runt domain in Ewing sarcoma cells; EWS/FLI prevents RUNX3 from activating a RUNX-responsive reporter (p6OSE2); stable suppression of RUNX3 delays anchorage-independent colony growth and reverses EWS/FLI-responsive gene expression.","method":"Co-immunoprecipitation, luciferase reporter assay, stable shRNA knockdown, soft agar colony assay","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP with domain identification, reporter assay, functional KD, single lab","pmids":["24812032"],"is_preprint":false}],"current_model":"RUNX3 is a runt-domain transcription factor that functions as a context-dependent regulator of cell proliferation, apoptosis, differentiation, and immunity: it acts as a downstream effector of TGF-β signaling in epithelial and immune cells, directly binds target gene promoters/enhancers (including p21, survivin, SOD3, Osterix, ICAM-3, CD36, miR-182, ING1, lubricin) to activate or repress transcription in a DNA-binding-dependent manner (Runt domain mutation R122C abrogates function), forms multi-protein complexes with pRb/Brd2 at the G1 restriction point, is post-translationally regulated by Src-mediated tyrosine phosphorylation (causing cytoplasmic mislocalization) and G9a-mediated lysine methylation (reducing CBFβ/p300 interactions and nuclear import under hypoxia), is transcriptionally repressed by EZH2-mediated H3K27 methylation and by Nr4a1/CoREST, is oncogenically upregulated by MYC in certain lymphomas, and serves as a master regulator of CD8+ T cell tissue residency, NK cell activation, and CD8/CD4 lineage commitment in thymopoiesis."},"narrative":{"mechanistic_narrative":"RUNX3 is a runt-domain DNA-binding transcription factor that acts as a context-dependent tumor suppressor and master regulator of immune-cell differentiation, operating downstream of TGF-β signaling to restrain proliferation and promote apoptosis in epithelial cells [PMID:11955451]. Its transcriptional control depends on direct, sequence-specific promoter binding, with the Runt-domain mutation R122C abolishing both DNA binding and tumor-suppressive function [PMID:11955451, PMID:24636883]. RUNX3 engages target genes bidirectionally: it activates growth-restraining and pro-apoptotic programs—inducing p21 within a transient pRb/Brd2 complex at the G1-S restriction point [PMID:28846108], inhibiting survivin [PMID:24636883], and driving apoptotic/ferroptotic outputs through SOD3 repression and ING1 activation [PMID:30692634, PMID:37156453]—while repressing targets such as Osterix, CD36, ICAM-3, and survivin [PMID:17352693, PMID:16887969, PMID:22479382, PMID:24636883]. It additionally restrains oncogenic signaling by ubiquitinating GLI1 to suppress Hedgehog output [PMID:31278361], serving as an endpoint effector of MST/Hippo-mediated cell death [PMID:21678419], and interacting with YAP to limit its oncogenic activity [PMID:29581836]. In the immune system, RUNX3 is a determinant of CD8 lineage commitment and CD4 repression in thymopoiesis [PMID:12796513], programs CD8+ tissue-resident memory identity by promoting residency genes and suppressing egress genes [PMID:29211713], and cooperates with ETS and T-box factors at enhancers to drive NK-cell activation programs [PMID:24421391, PMID:24236182]. RUNX3 function is tuned post-translationally—Src-mediated tyrosine phosphorylation drives cytoplasmic mislocalization and inactivation [PMID:20100835], and hypoxic G9a-mediated lysine methylation reduces CBFβ/p300 interaction and nuclear import [PMID:33116296]—and transcriptionally, being silenced by Nr4a1/CoREST and AML fusion proteins yet upregulated by MYC in certain lymphomas [PMID:25762306, PMID:18663147, PMID:28119527]. Beyond its tumor-suppressive role, context-specific gain of RUNX3 in Tet2-deficient progenitors suppresses Runx1 targets and activates Myc targets to drive MDS-like transformation [PMID:32341038].","teleology":[{"year":1999,"claim":"Established RUNX3 as a nuclear-matrix-associated serine phosphoprotein in hematopoietic cells whose expression is inducible, defining it as a regulated nuclear factor rather than a constitutive housekeeping protein.","evidence":"Western blot, nuclear fractionation, and pharmacological induction with retinoid receptor-selective ligands in hematopoietic cells","pmids":["10419474"],"confidence":"Medium","gaps":["Did not define target genes or DNA-binding activity","Mechanism linking RARα signaling to RUNX3 induction not resolved"]},{"year":2002,"claim":"Defined RUNX3 as a TGF-β effector and tumor suppressor in gastric epithelium, answering whether RUNX3 loss is causal for proliferation/apoptosis dysregulation and establishing the Runt-domain dependence of its function.","evidence":"Runx3 knockout mice, TGF-β response assays, nude-mouse tumorigenicity, and R122C site-directed mutagenesis","pmids":["11955451"],"confidence":"High","gaps":["Direct transcriptional targets mediating growth inhibition not identified","Cofactor requirements for TGF-β coupling unresolved"]},{"year":2003,"claim":"Showed RUNX3 (with RUNX1) is a transcriptional repressor of CD4 required for CD8 lineage commitment, defining its non-redundant and partially redundant roles in thymic T-cell fate.","evidence":"Runx3 knockout and compound Runx3/Runx1 mutant mice, flow cytometry, cytotoxicity assays","pmids":["12796513"],"confidence":"High","gaps":["Direct CD4-silencer binding by RUNX3 not mapped in this study","Division of labor between RUNX1 and RUNX3 sites unresolved"]},{"year":2006,"claim":"Demonstrated direct repressive promoter occupancy on myeloid and developmental targets (CD36) and a requirement in DETC development, generalizing RUNX3 as a sequence-specific repressor beyond epithelium.","evidence":"EMSA, ChIP, reporter assays, and Runx3 knockout mice with flow cytometry","pmids":["16887969","17222403"],"confidence":"Medium","gaps":["Cofactor specificity at distinct promoters not fully resolved","Activator vs repressor switch determinants unknown"]},{"year":2007,"claim":"Mapped direct DNA-binding repression of Osterix and a physical interaction with Ku70/Ku80 that modulates p21 transactivation, linking RUNX3 to both differentiation control and a DNA-repair-protein partner.","evidence":"EMSA, ChIP, site-directed mutagenesis, affinity purification/MS, domain-mapped pull-down and Co-IP","pmids":["17352693","17488194","17662272"],"confidence":"Medium","gaps":["Functional consequence of Ku70 interaction in vivo unclear","Whether RUNX3 acts in DNA repair directly not established"]},{"year":2010,"claim":"Identified Src-mediated tyrosine phosphorylation as a post-translational inactivation mechanism causing cytoplasmic mislocalization, explaining how RUNX3 tumor-suppressor function is silenced without genetic loss.","evidence":"Src overexpression, Co-IP, siRNA knockdown, kinase inhibition, and subcellular fractionation in gastric/breast cancer cells","pmids":["20100835"],"confidence":"High","gaps":["Specific phosphorylated tyrosine residues and import machinery affected not fully defined","In vivo prevalence in tumors not quantified"]},{"year":2012,"claim":"Positioned RUNX3 as an endpoint effector of MST/Hippo-mediated cell death and a direct repressor of ICAM-3, integrating it into apoptotic signaling and macrophage differentiation.","evidence":"Reciprocal Co-IP with SAV1/MST2, siRNA, cell-death assays, ChIP and reporter assays","pmids":["21678419","22479382"],"confidence":"Medium","gaps":["Whether RUNX3 transcriptional output mediates Hippo-induced death not mapped","MST2 modification of RUNX3 not defined"]},{"year":2013,"claim":"Provided genome-wide evidence that RUNX3 binds RUNX/ETS-motif enhancers overlapping T-bet/p300 sites in CD8+ T and NK cells, defining its enhancer-level cooperativity and activation-expandable target set.","evidence":"ChIP-seq and transcriptome comparison of wild-type vs Runx3-/- primary cells; TSP-1 promoter binding in melanoma","pmids":["24236182","23846726"],"confidence":"High","gaps":["Causal cofactor hierarchy at shared enhancers not dissected","Direct vs indirect targets within the expanded set not separated"]},{"year":2014,"claim":"Established RUNX3 cooperation with ETS/T-box factors driving IL-15-dependent NK-cell maturation and demonstrated DNA-binding-dependent repression of survivin, refining both immune and tumor-suppressive mechanisms.","evidence":"Runx3 knockout mice, ChIP-seq, RNA-seq, in vivo NK quantification; ChIP/reporter with R122C mutagenesis; Co-IP with EWS/FLI","pmids":["24421391","24636883","24812032"],"confidence":"High","gaps":["Mechanism of EWS/FLI sequestration of RUNX3 not fully resolved","Direct uNK target genes not enumerated"]},{"year":2015,"claim":"Defined transcriptional silencing of RUNX3 by Nr4a1/CoREST in CD8+ T cells and a developmental requirement in osteoblast proliferation, expanding both its upstream regulation and tissue-specific roles.","evidence":"Nr4a1 knockout mice with ChIP; osteoblast-specific conditional knockout with histomorphometry and transcriptome","pmids":["25762306","25605327"],"confidence":"High","gaps":["Direct osteoblast target genes not fully mapped","Link between Nr4a1 repression and lineage outcomes incomplete"]},{"year":2017,"claim":"Showed RUNX3 programs CD8+ tissue-resident memory identity and acts at the G1-S restriction point in a pRb/Brd2/p21 complex, while loss promotes oxidative-damage-driven senescence—unifying its immune, cell-cycle, and tumor-suppressive functions.","evidence":"In vivo RNAi screen, conditional KO and overexpression, ATAC-seq; Co-IP three-protein complex reconstitution; HO-1/DSB/senescence assays; miR-182/HOXA9 axis ChIP and reporter","pmids":["29211713","28846108","29074538","29054094"],"confidence":"High","gaps":["Dynamics of pRb/Brd2 complex assembly across cell types not generalized","Direct vs indirect contribution to residency gene network unresolved"]},{"year":2019,"claim":"Extended RUNX3's anti-oncogenic repertoire to direct GLI1 ubiquitination (Hedgehog suppression) and YAP inhibition, and to sensory-neuron identity maintenance, broadening its mechanistic range beyond classical transcription.","evidence":"Co-IP and ubiquitination assays; interaction-dependent YAP functional assays; conditional Runx3 inactivation in PSNs with electrophysiology","pmids":["31278361","29581836","31575648"],"confidence":"Medium","gaps":["Whether GLI1 ubiquitination is RUNX3-intrinsic or scaffold-dependent unclear","NT3-to-RUNX3 maintenance signaling pathway not detailed"]},{"year":2020,"claim":"Defined hypoxic G9a-mediated lysine methylation of RUNX3 (K129/K171) as an inactivation switch reducing CBFβ/p300 binding and import, and revealed an oncogenic gain-of-function context where RUNX3 drives MDS-like transformation in Tet2-deficient progenitors.","evidence":"In vitro methylation assays with mutagenesis, Co-IP, immunofluorescence; RUNX3-overexpressing Tet2-deficient mouse model with ChIP-seq/RNA-seq","pmids":["33116296","32341038"],"confidence":"High","gaps":["Determinants of tumor-suppressor vs oncogenic context-switching not resolved","Reversibility of K-methylation in vivo not quantified"]},{"year":2021,"claim":"Resolved the overlapping yet functionally distinct RUNX1/RUNX3 binding landscape during T-lineage commitment, clarifying redundancy and site-shifting that underlie their collaborative gene-regulatory program.","evidence":"Single and double Runx CRISPR knockouts, stage-specific ChIP-seq and RNA-seq","pmids":["33479171"],"confidence":"High","gaps":["Cofactors driving site-shifting not fully identified","Generality beyond T-progenitors untested"]},{"year":2023,"claim":"Added new tissue-specific functions—endothelial RUNX3 loss driving paracrine liver fibrosis, ferroptosis induction via ING1/SLC7A11, articular cartilage maintenance via lubricin/aggrecan, and vagal sensory-neuron control of esophageal peristalsis—demonstrating broad organ-level roles.","evidence":"Endothelial- and chondrocyte-specific knockout mice, scRNA-seq, adenoviral rescue, ChIP/reporter ferroptosis assays, optogenetics and genetic ablation","pmids":["39042837","37156453","36261443","37192624"],"confidence":"Medium","gaps":["Direct vs indirect transcriptional targets in each tissue not fully separated","Shared regulatory logic across these contexts not unified"]},{"year":null,"claim":"What molecular determinants switch RUNX3 between tumor-suppressive and oncogenic transcriptional output, and how its post-translational modifications, cofactor availability, and genomic site selection are integrated in a given cell state, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model for context-dependent activation vs repression","Structural basis of CBFβ/p300 vs G9a competition undefined","In vivo dynamics of the pRb/Brd2/RUNX3 cell-cycle complex unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,9,11,18,27]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,8,9,11,27,31]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,6,25]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,9,11,27]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,3,13,14,24]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,7,35]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5,8,27,31]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,10,21,30,32]}],"complexes":["RUNX3-pRb-Brd2 R-point complex"],"partners":["CBFB","EP300","RB1","BRD2","SRC","G9A (EHMT2)","XRCC6 (KU70)","YAP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13761","full_name":"Runt-related transcription factor 3","aliases":["Acute myeloid leukemia 2 protein","Core-binding factor subunit alpha-3","CBF-alpha-3","Oncogene AML-2","Polyomavirus enhancer-binding protein 2 alpha C subunit","PEA2-alpha C","PEBP2-alpha C","SL3-3 enhancer factor 1 alpha C subunit","SL3/AKV core-binding factor alpha C subunit"],"length_aa":415,"mass_kda":44.4,"function":"Forms the heterodimeric complex core-binding factor (CBF) with CBFB. 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CBF complexes binding to the transcriptional silencer is essential for recruitment of nuclear protein complexes that catalyze epigenetic modifications to establish epigenetic ZBTB7B silencing (By similarity). Necessary for the development and survival of sensory neurons expressing parvalbumin (By similarity)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q13761/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RUNX3","classification":"Not Classified","n_dependent_lines":27,"n_total_lines":1208,"dependency_fraction":0.022350993377483443},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RUNX3","total_profiled":1310},"omim":[{"mim_id":"611218","title":"GASDERMIN A; GSDMA","url":"https://www.omim.org/entry/611218"},{"mim_id":"610095","title":"KILLER CELL IMMUNOGLOBULIN-LIKE RECEPTOR, THREE DOMAINS, LONG CYTOPLASMIC TAIL, 3; KIR3DL3","url":"https://www.omim.org/entry/610095"},{"mim_id":"600211","title":"RUNT-RELATED TRANSCRIPTION FACTOR 2; RUNX2","url":"https://www.omim.org/entry/600211"},{"mim_id":"600210","title":"RUNT-RELATED TRANSCRIPTION FACTOR 3; RUNX3","url":"https://www.omim.org/entry/600210"},{"mim_id":"301023","title":"MICRO RNA 532; MIR532","url":"https://www.omim.org/entry/301023"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Vesicles","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":66.3},{"tissue":"lymphoid tissue","ntpm":33.3}],"url":"https://www.proteinatlas.org/search/RUNX3"},"hgnc":{"alias_symbol":["AML2","PEBP2A3"],"prev_symbol":["CBFA3"]},"alphafold":{"accession":"Q13761","domains":[{"cath_id":"2.60.40.720","chopping":"56-174","consensus_level":"high","plddt":95.9947,"start":56,"end":174}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13761","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13761-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13761-F1-predicted_aligned_error_v6.png","plddt_mean":60.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RUNX3","jax_strain_url":"https://www.jax.org/strain/search?query=RUNX3"},"sequence":{"accession":"Q13761","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13761.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13761/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13761"}},"corpus_meta":[{"pmid":"11955451","id":"PMC_11955451","title":"Causal relationship 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physiology","url":"https://pubmed.ncbi.nlm.nih.gov/24812032","citation_count":19,"is_preprint":false},{"pmid":"23846726","id":"PMC_23846726","title":"Thrombospondin-1 is a putative target gene of Runx2 and Runx3.","date":"2013","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/23846726","citation_count":19,"is_preprint":false},{"pmid":"25229459","id":"PMC_25229459","title":"Association of promoter methylation of RUNX3 gene with the development of esophageal cancer: a meta analysis.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25229459","citation_count":19,"is_preprint":false},{"pmid":"21678419","id":"PMC_21678419","title":"Identification of RUNX3 as a component of the MST/Hpo signaling pathway.","date":"2012","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/21678419","citation_count":19,"is_preprint":false},{"pmid":"19603429","id":"PMC_19603429","title":"RUNX3-mediated repression of RUNX1 in B cells.","date":"2009","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/19603429","citation_count":18,"is_preprint":false},{"pmid":"28795320","id":"PMC_28795320","title":"EZH2 promotes cell proliferation by regulating the expression of RUNX3 in laryngeal carcinoma.","date":"2017","source":"Molecular and cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28795320","citation_count":18,"is_preprint":false},{"pmid":"26756701","id":"PMC_26756701","title":"RUNX3 is down-regulated in glioma by Myc-regulated miR-4295.","date":"2016","source":"Journal of cellular and molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26756701","citation_count":18,"is_preprint":false},{"pmid":"31171641","id":"PMC_31171641","title":"RUNX3 levels in human hematopoietic progenitors are regulated by aging and dictate erythroid-myeloid 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/24636883","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47793,"output_tokens":8478,"usd":0.135274,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18259,"output_tokens":5604,"usd":0.115697,"stage2_stop_reason":"end_turn"},"total_usd":0.250971,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"RUNX3 is a downstream effector of TGF-β signaling in gastric epithelial cells; Runx3-null mouse gastric mucosa shows hyperplasia due to stimulated proliferation and suppressed apoptosis with resistance to TGF-β growth-inhibitory and apoptosis-inducing actions. A Runt-domain mutation (R122C) abolishes tumor-suppressive function.\",\n      \"method\": \"Runx3 knockout mice, primary culture TGF-β response assays, nude mouse tumorigenicity assay, site-directed mutagenesis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal in vivo and in vitro methods, widely replicated, foundational study\",\n      \"pmids\": [\"11955451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Runx3 is required for CD8+ T cell maturation in the thymus; Runx3-deficient mice show impaired CD8 T cell lineage decisions with aberrant CD4 expression on peripheral CD8 T cells and reduced cytotoxic activity. Genetic epistasis with Runx1 (Runx3-/-;Runx1+/-) results in complete absence of single-positive CD8+ T cells, indicating both act as transcriptional repressors of CD4 during T cell lineage decisions.\",\n      \"method\": \"Runx3 knockout mice, compound Runx3/Runx1 mutants, flow cytometry, in vitro cytotoxicity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with defined cellular phenotype, epistasis analysis, replicated in multiple studies\",\n      \"pmids\": [\"12796513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Src kinase phosphorylates RUNX3 at tyrosine residues, causing cytoplasmic mislocalization; Src knockdown or kinase inhibition causes re-localization of RUNX3 to the nucleus, identifying Src-mediated tyrosine phosphorylation as a mechanism of RUNX3 inactivation in gastric and breast cancer.\",\n      \"method\": \"Overexpression of Src, co-immunoprecipitation, siRNA knockdown of Src, chemical kinase inhibition, subcellular fractionation/immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (co-IP, siRNA, inhibitor) in single lab with clear mechanistic readout\",\n      \"pmids\": [\"20100835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Runx3 programs CD8+ T cell tissue residency (TRM cells) by supporting expression of tissue-residency genes and suppressing genes associated with tissue egress; Runx3-deficient CD8+ TILs fail to accumulate in tumors, while Runx3 overexpression enhances tumor-specific CD8+ T cell abundance and delays tumor growth.\",\n      \"method\": \"Pooled in vivo RNAi screen, Runx3 conditional knockout, adoptive T cell transfer, gene expression profiling, chromatin accessibility (ATAC-seq)\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo RNAi screen, KO and OE experiments, multiple orthogonal methods, published in high-impact journal\",\n      \"pmids\": [\"29211713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Runx3 plays a critical role at the restriction (R)-point in the G1-S transition; Runx3 transiently forms a complex with pRb and Brd2 to induce p21 (Cdkn1a) expression. Cyclin D-CDK4/6 promotes dissociation of this complex, turning off p21. Runx3-/- MEFs show dysregulated R-point and tumor formation in nude mice.\",\n      \"method\": \"Runx3 knockout MEFs, co-immunoprecipitation, luciferase reporter, nude mouse tumorigenicity, reconstitution experiments with oncogenic K-Ras\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — complex reconstitution (Co-IP of three-protein complex), KO phenotype, in vivo tumorigenicity, multiple methods single lab\",\n      \"pmids\": [\"28846108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RUNX3 is a component of the MST/Hippo signaling pathway; SAV1/WW45 facilitates close association between MST2 and RUNX3, and MST2 stimulates SAV1-RUNX3 interaction. RUNX3 knockdown abolishes MST/Hpo-mediated cell death, identifying RUNX3 as an endpoint effector of this pathway.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, cell death assays\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — reciprocal Co-IP, siRNA functional assay, single lab\",\n      \"pmids\": [\"21678419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Under hypoxia, G9a (KMT) methylates RUNX3 at K129 and K171 via interaction with the Runt domain; this methylation inactivates RUNX3 transactivation by reducing interactions with CBFβ and p300 cofactors and reducing p300-mediated acetylation of RUNX3, which is involved in nuclear import via importin-α1.\",\n      \"method\": \"Co-immunoprecipitation, in vitro methylation assay, site-directed mutagenesis, immunofluorescence localization, cell proliferation assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro methylation assay with mutagenesis, multiple binding partner experiments, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"33116296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RUNX3 directly interacts with GLI1 and promotes its ubiquitination (via E3 ligase β-TrCP), thereby inhibiting Hedgehog signaling to suppress stemness and metastasis in colorectal cancer.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, knockdown/overexpression experiments, correlation analysis in CRC tissues\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus ubiquitination assay, single lab\",\n      \"pmids\": [\"31278361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RUNX3 induces apoptosis in colorectal cancer cells via TRAIL by inhibiting SOD3 transcription (binding to SOD3 promoter), thereby increasing ROS and ER stress, which upregulates CHOP and DR5.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter, overexpression/knockdown, ROS measurement, flow cytometry, xenograft model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional assays, single lab, multiple methods\",\n      \"pmids\": [\"30692634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Runx3 directly binds to the Osterix promoter at a specific RUNX-responsive element (AGTGGTT, -713 to -707 bp) and negatively regulates Osterix expression in dental pulp cells, as demonstrated by EMSA and ChIP assays; mutation of this site abolishes repression.\",\n      \"method\": \"Luciferase reporter assay, electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation (ChIP), site-directed mutagenesis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro DNA-binding assay with mutagenesis plus in vivo ChIP, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"17352693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Runx3 regulates both early and late stages of chondrocyte differentiation; Runx3 gain-of-function and loss-of-function alter markers of chondrocyte maturation, and Runx3 transcriptionally inhibits Runx1 expression in chondrocytes.\",\n      \"method\": \"siRNA knockdown, overexpression, luciferase reporter assay, real-time RT-PCR, immunohistochemistry in mouse embryos\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — gain and loss of function with reporter assay, single lab\",\n      \"pmids\": [\"17488194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RUNX3 negatively regulates CD36 expression in myeloid cells by directly binding two functional RUNX-binding elements in the CD36 gene proximal regulatory region in vitro and in vivo; RUNX3 overexpression in myeloid cells drastically diminishes CD36 expression.\",\n      \"method\": \"Luciferase reporter assay, EMSA, chromatin immunoprecipitation (ChIP), overexpression in myeloid cells\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP in vivo occupancy plus EMSA and reporter, single lab\",\n      \"pmids\": [\"16887969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Runx3 is required for development of skin dendritic epidermal T cells (DETCs) by regulating expression of the αEβ7 integrin CD103 and IL-2Rβ, affecting proliferation and epithelial retention of DETC precursors.\",\n      \"method\": \"Runx3 knockout mice, flow cytometry, gene expression analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined cellular phenotype and specific target gene regulation, single lab\",\n      \"pmids\": [\"17222403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Runx3 cooperates with ETS and T-box transcription factors to drive the IL-15-mediated transcription program during natural killer cell activation; loss of Runx3 impairs IL-15-dependent accumulation of mature NK cells in vivo and uterine NK cells are completely absent in pregnant Runx3-/- mice.\",\n      \"method\": \"Runx3 knockout mice, ChIP-seq, RNA-seq/differential gene expression analysis, in vivo NK cell quantification\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus transcriptome analysis and in vivo KO phenotype, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"24421391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Runx3 regulates a transcriptional program in CD8+ T and NK cells; Runx3-bound genomic regions are enriched for RUNX and ETS motifs and overlap with T-bet/p300-bound enhancer regions; IL-2 activation expands the set of Runx3-regulated genes to include proliferation, cytotoxicity, migration and cytokine production genes.\",\n      \"method\": \"ChIP-seq, transcriptome analysis of wild-type vs. Runx3-/- primary cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-seq combined with transcriptome analysis in primary cells, single lab\",\n      \"pmids\": [\"24236182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RUNX3 transcription is repressed by the AML fusion proteins RUNX1-ETO (t(8;21)) and CBFβ-MYH11 (inv(16)) acting directly or indirectly through two conserved RUNX binding sites in the RUNX3 P1 promoter, not by P2 methylation; ectopic expression of fusion proteins also inhibits endogenous RUNX3 expression in vitro.\",\n      \"method\": \"Luciferase reporter assay, promoter analysis, ectopic expression in cell lines, methylation analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — promoter reporter with site analysis, in vitro expression system, single lab\",\n      \"pmids\": [\"18663147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RUNX3 represses RUNX1 expression in proliferating human B cells; this repression of RUNX1 by RUNX3 is required to allow cell proliferation at a key B-cell developmental stage.\",\n      \"method\": \"Expression analysis in B cell lines, functional studies of RUNX1/RUNX3 interplay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional observation in cell lines, limited mechanistic detail in abstract, single lab\",\n      \"pmids\": [\"19603429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Runx3 physically interacts with DNA repair protein Ku70 (and Ku80) in vivo and in vitro; the interaction requires amino acids 241-322 of Runx3 (transcriptional activation domain) and amino acids 1-116 of Ku70; Ku70 knockdown enhances Runx3-mediated p21 transcriptional activation.\",\n      \"method\": \"Affinity purification/mass spectrometry, His-tag pull-down, co-immunoprecipitation, immunofluorescence, siRNA knockdown\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro pull-down with domain mapping plus in vivo Co-IP and functional consequence, single lab\",\n      \"pmids\": [\"17662272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RUNX3 negatively regulates ICAM-3 expression during macrophage differentiation; RUNX3 occupies RUNX cognate sequences in the ICAM-3 promoter in vivo, and siRNA-mediated reduction of RUNX3 increases ICAM-3 mRNA levels; RUNX3 cooperates with Ets and C/EBP family factors at the ICAM-3 promoter.\",\n      \"method\": \"Luciferase reporter assay, ChIP, siRNA knockdown, protein expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ChIP occupancy plus reporter and siRNA functional validation, single lab\",\n      \"pmids\": [\"22479382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RUNX3 directly binds the promoter of miR-182 (by ChIP) and regulates its expression; miR-182 targets HOXA9 (validated by luciferase assay), establishing a RUNX3→miR-182→HOXA9 axis that inhibits gastric cancer cell proliferation, migration, and invasion.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, qRT-PCR, Western blot, EdU proliferation, Transwell assay, xenograft mouse model\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase reporter, functional readout, single lab\",\n      \"pmids\": [\"29054094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RUNX3 loss leads to transcriptional downregulation of the redox regulator HO-1 (HMOX1), which elevates oxidative DNA damage and causes DNA double-strand breaks, triggering cellular senescence and acquisition of the senescence-associated secretory phenotype (SASP) under TGFβ stimulation.\",\n      \"method\": \"RUNX3 loss-of-function in cancer cells, gene expression analysis, DNA damage assays, ROS measurement, co-relation with TGFβ gene signature in tumor datasets\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO/KD with mechanistic pathway validation, multiple methods, single lab\",\n      \"pmids\": [\"29074538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Runx3 is expressed in osteoblast precursors and Runx3-deficient osteoblast-specific (Col1α1-cre) mice develop severe congenital osteopenia due to decreased osteoblast numbers from diminished proliferation; Runx3-null osteoblast transcriptomes show decreased osteoblastic markers and increased Notch signaling components.\",\n      \"method\": \"Conditional knockout mice (osteoblast-specific Cre), bone histomorphometry, primary osteoblast culture, transcriptome analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with histomorphometry and transcriptome, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"25605327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MYC directly binds the RUNX3 enhancer region (shown by ChIP-qPCR) and positively regulates RUNX3 transcription in NK/T-cell lymphoma (NKTL); co-transfection of MYC with RUNX3 enhancer reporter activates transcription; MYC inhibition (JQ1) causes downregulation of both MYC and RUNX3.\",\n      \"method\": \"ChIP-qPCR, luciferase reporter assay, JQ1 treatment, ectopic MYC expression rescue experiment\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter and rescue, single lab\",\n      \"pmids\": [\"28119527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RUNX3 overexpression in Tet2-deficient hematopoietic stem/progenitor cells suppresses Runx1 expression and its target genes (Cebpa, Csf1r) by binding Runx1-regulatory regions and remodeling chromatin, while activating Myc target genes; this drives MDS-like transformation in vivo.\",\n      \"method\": \"RUNX3-overexpressing Tet2-deficient mouse model, ChIP-seq, RNA-seq, in vivo hematopoiesis analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model with ChIP-seq and transcriptome, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"32341038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Runx1 and Runx3 are co-expressed in single pro-T cells, bind highly overlapping genomic sites, and have redundant/collaborative functions in T-lineage gene activation and progenitor gene repression during T cell commitment; they shift binding sites extensively during commitment, with functionally distinct sites characterized by different co-factor binding patterns.\",\n      \"method\": \"Single and double Runx CRISPR/Cas9 knockouts, ChIP-seq, RNA-seq, stage-specific analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double KO epistasis, genome-wide ChIP-seq, transcriptomics, multiple orthogonal methods\",\n      \"pmids\": [\"33479171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AML2/RUNX3 protein in hematopoietic cells is a nuclear serine phosphoprotein associated with the nuclear matrix; its expression is induced by all-trans retinoic acid, 13-cis-RA, and 9-cis-RA through the RARα-specific signaling pathway (not RXR), as demonstrated using selective agonists/antagonists.\",\n      \"method\": \"Western blot, nuclear fractionation, pharmacological induction with retinoid receptor-selective ligands and antagonists\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — pharmacological dissection with selective agonists/antagonists and nuclear matrix fractionation, single lab\",\n      \"pmids\": [\"10419474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nr4a1 directly suppresses Runx3 expression in CD8+ T cells by recruiting the corepressor CoREST to the Runx3 locus; loss of Nr4a1 results in increased Runx3 expression in thymocytes and a 2-fold increase in CD8+ T cell frequency.\",\n      \"method\": \"Nr4a1 knockout mice, ChIP (Nr4a1 binding to Runx3 promoter with CoREST), flow cytometry\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP showing direct occupancy plus KO phenotype, single lab\",\n      \"pmids\": [\"25762306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RUNX3 inhibits survivin expression by directly binding to a RUNX3-binding site in the survivin gene promoter; RUNX3-R122C mutation (Runt domain) abolishes binding and has no effect on survivin promoter activity, demonstrating DNA-binding dependence.\",\n      \"method\": \"Luciferase reporter assay, ChIP, overexpression/knockdown, site-directed mutagenesis (R122C), apoptosis assays\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter with mutagenesis, single lab\",\n      \"pmids\": [\"24636883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Runx3 binds the TSP-1 (thrombospondin-1) promoter and stimulates its transcriptional activity and protein expression in melanoma cells; Runx3 expression dramatically increases TSP-1 at both transcriptional and translational levels.\",\n      \"method\": \"Promoter luciferase reporter assay, ChIP, qRT-PCR, Western blot, overexpression\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assay, single lab\",\n      \"pmids\": [\"23846726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RUNX3 deficiency in liver sinusoidal endothelial cells (LSECs) leads to IL-6/JAK/STAT3 pathway activation and LSEC dysfunction; RUNX3-deficient LSECs secrete LRG1, which activates hepatic stellate cells via TGFBR1-SMAD2/3 signaling in a paracrine manner, driving liver fibrosis.\",\n      \"method\": \"Endothelial-specific Runx3 knockout mice, single-cell RNA-seq, co-culture experiments, mechanistic pathway analysis (IL-6/JAK/STAT3, TGFBR1-SMAD2/3)\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO plus scRNA-seq and coculture mechanistic experiments, single lab\",\n      \"pmids\": [\"39042837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Runx3 directly regulates lubricin and aggrecan as transcriptional target genes in articular chondrocytes; Runx3-knockout mice show accelerated osteoarthritis after surgical induction with decreased lubricin and aggrecan; intra-articular Runx3 adenovirus ameliorates osteoarthritis.\",\n      \"method\": \"Runx3 conditional knockout mice, comprehensive transcriptional analyses, adenovirus rescue, surgical osteoarthritis model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO plus transcriptional target identification and adenoviral rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"36261443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RUNX3 induces ferroptosis in gallbladder cancer cells by activating ING1 transcription (validated by dual-luciferase reporter and ChIP assay), thereby repressing SLC7A11 in a p53-dependent manner; RUNX3 promoter methylation by DNMT1 suppresses this ferroptosis pathway.\",\n      \"method\": \"Dual-luciferase reporter assay, ChIP, gain/loss-of-function assays in vitro and in vivo, bisulfite sequencing PCR\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter and functional ferroptosis assays, single lab\",\n      \"pmids\": [\"37156453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Runx3 is required for maintenance of cell identity of a muscle-selective subgroup of proprioceptive sensory neurons (PSNs) and controls sensorimotor connections between PSNs and motor neurons; muscle-derived neurotrophin 3 (NT3) signaling is necessary for maintenance of RUNX3 expression in PSNs.\",\n      \"method\": \"Conditional Runx3 inactivation in PSNs after peripheral innervation, anatomical tracing, electrophysiology, genetic ablation\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with electrophysiology and anatomical analysis, single lab\",\n      \"pmids\": [\"31575648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Runx3-expressing vagal sensory neurons (subsets also expressing Prox2) form intraganglionic laminar endings in the esophagus and stomach; genetic ablation of Prox2 and Runx3 neurons demonstrates their essential role in esophageal peristalsis in freely behaving mice.\",\n      \"method\": \"Genetically guided anatomical tracing, optogenetics, electrophysiology, genetic ablation\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — optogenetics, electrophysiology, and genetic ablation with direct functional readout, single study\",\n      \"pmids\": [\"37192624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NO•-induced IDO1/Kynurenine/AHR signaling in pancreatic cancer is mediated by RUNX3 transcription factor, establishing a NO•/RUNX3/Kynurenine metabolic axis that enhances disease aggressiveness.\",\n      \"method\": \"Gene expression correlation analysis, NO• donor treatment, IDO1/kynurenine measurements, mechanistic pathway analysis in pancreatic cancer cell lines\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacological treatment with expression correlation, limited mechanistic depth in abstract, single lab\",\n      \"pmids\": [\"31609478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RUNX1 and RUNX3 physically interact with YAP and act as negative regulators of YAP oncogenic function in mammary epithelial cells; RUNX1/RUNX3 inhibit YAP-mediated migration and stemness in an interaction-dependent manner and co-regulate YAP-mediated gene expression.\",\n      \"method\": \"Co-immunoprecipitation, overexpression/knockdown, migration assay, mammosphere formation\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP showing interaction, functional assays with interaction-dependence tested, single lab\",\n      \"pmids\": [\"29581836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RUNX3 binds to EWS/FLI via its Runt domain in Ewing sarcoma cells; EWS/FLI prevents RUNX3 from activating a RUNX-responsive reporter (p6OSE2); stable suppression of RUNX3 delays anchorage-independent colony growth and reverses EWS/FLI-responsive gene expression.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay, stable shRNA knockdown, soft agar colony assay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP with domain identification, reporter assay, functional KD, single lab\",\n      \"pmids\": [\"24812032\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RUNX3 is a runt-domain transcription factor that functions as a context-dependent regulator of cell proliferation, apoptosis, differentiation, and immunity: it acts as a downstream effector of TGF-β signaling in epithelial and immune cells, directly binds target gene promoters/enhancers (including p21, survivin, SOD3, Osterix, ICAM-3, CD36, miR-182, ING1, lubricin) to activate or repress transcription in a DNA-binding-dependent manner (Runt domain mutation R122C abrogates function), forms multi-protein complexes with pRb/Brd2 at the G1 restriction point, is post-translationally regulated by Src-mediated tyrosine phosphorylation (causing cytoplasmic mislocalization) and G9a-mediated lysine methylation (reducing CBFβ/p300 interactions and nuclear import under hypoxia), is transcriptionally repressed by EZH2-mediated H3K27 methylation and by Nr4a1/CoREST, is oncogenically upregulated by MYC in certain lymphomas, and serves as a master regulator of CD8+ T cell tissue residency, NK cell activation, and CD8/CD4 lineage commitment in thymopoiesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RUNX3 is a runt-domain DNA-binding transcription factor that acts as a context-dependent tumor suppressor and master regulator of immune-cell differentiation, operating downstream of TGF-\\u03b2 signaling to restrain proliferation and promote apoptosis in epithelial cells [#0]. Its transcriptional control depends on direct, sequence-specific promoter binding, with the Runt-domain mutation R122C abolishing both DNA binding and tumor-suppressive function [#0, #27]. RUNX3 engages target genes bidirectionally: it activates growth-restraining and pro-apoptotic programs\\u2014inducing p21 within a transient pRb/Brd2 complex at the G1-S restriction point [#4], inhibiting survivin [#27], and driving apoptotic/ferroptotic outputs through SOD3 repression and ING1 activation [#8, #31]\\u2014while repressing targets such as Osterix, CD36, ICAM-3, and survivin [#9, #11, #18, #27]. It additionally restrains oncogenic signaling by ubiquitinating GLI1 to suppress Hedgehog output [#7], serving as an endpoint effector of MST/Hippo-mediated cell death [#5], and interacting with YAP to limit its oncogenic activity [#35]. In the immune system, RUNX3 is a determinant of CD8 lineage commitment and CD4 repression in thymopoiesis [#1], programs CD8+ tissue-resident memory identity by promoting residency genes and suppressing egress genes [#3], and cooperates with ETS and T-box factors at enhancers to drive NK-cell activation programs [#13, #14]. RUNX3 function is tuned post-translationally\\u2014Src-mediated tyrosine phosphorylation drives cytoplasmic mislocalization and inactivation [#2], and hypoxic G9a-mediated lysine methylation reduces CBF\\u03b2/p300 interaction and nuclear import [#6]\\u2014and transcriptionally, being silenced by Nr4a1/CoREST and AML fusion proteins yet upregulated by MYC in certain lymphomas [#26, #15, #22]. Beyond its tumor-suppressive role, context-specific gain of RUNX3 in Tet2-deficient progenitors suppresses Runx1 targets and activates Myc targets to drive MDS-like transformation [#23].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established RUNX3 as a nuclear-matrix-associated serine phosphoprotein in hematopoietic cells whose expression is inducible, defining it as a regulated nuclear factor rather than a constitutive housekeeping protein.\",\n      \"evidence\": \"Western blot, nuclear fractionation, and pharmacological induction with retinoid receptor-selective ligands in hematopoietic cells\",\n      \"pmids\": [\"10419474\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define target genes or DNA-binding activity\", \"Mechanism linking RAR\\u03b1 signaling to RUNX3 induction not resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined RUNX3 as a TGF-\\u03b2 effector and tumor suppressor in gastric epithelium, answering whether RUNX3 loss is causal for proliferation/apoptosis dysregulation and establishing the Runt-domain dependence of its function.\",\n      \"evidence\": \"Runx3 knockout mice, TGF-\\u03b2 response assays, nude-mouse tumorigenicity, and R122C site-directed mutagenesis\",\n      \"pmids\": [\"11955451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets mediating growth inhibition not identified\", \"Cofactor requirements for TGF-\\u03b2 coupling unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed RUNX3 (with RUNX1) is a transcriptional repressor of CD4 required for CD8 lineage commitment, defining its non-redundant and partially redundant roles in thymic T-cell fate.\",\n      \"evidence\": \"Runx3 knockout and compound Runx3/Runx1 mutant mice, flow cytometry, cytotoxicity assays\",\n      \"pmids\": [\"12796513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct CD4-silencer binding by RUNX3 not mapped in this study\", \"Division of labor between RUNX1 and RUNX3 sites unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated direct repressive promoter occupancy on myeloid and developmental targets (CD36) and a requirement in DETC development, generalizing RUNX3 as a sequence-specific repressor beyond epithelium.\",\n      \"evidence\": \"EMSA, ChIP, reporter assays, and Runx3 knockout mice with flow cytometry\",\n      \"pmids\": [\"16887969\", \"17222403\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cofactor specificity at distinct promoters not fully resolved\", \"Activator vs repressor switch determinants unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapped direct DNA-binding repression of Osterix and a physical interaction with Ku70/Ku80 that modulates p21 transactivation, linking RUNX3 to both differentiation control and a DNA-repair-protein partner.\",\n      \"evidence\": \"EMSA, ChIP, site-directed mutagenesis, affinity purification/MS, domain-mapped pull-down and Co-IP\",\n      \"pmids\": [\"17352693\", \"17488194\", \"17662272\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of Ku70 interaction in vivo unclear\", \"Whether RUNX3 acts in DNA repair directly not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Src-mediated tyrosine phosphorylation as a post-translational inactivation mechanism causing cytoplasmic mislocalization, explaining how RUNX3 tumor-suppressor function is silenced without genetic loss.\",\n      \"evidence\": \"Src overexpression, Co-IP, siRNA knockdown, kinase inhibition, and subcellular fractionation in gastric/breast cancer cells\",\n      \"pmids\": [\"20100835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylated tyrosine residues and import machinery affected not fully defined\", \"In vivo prevalence in tumors not quantified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Positioned RUNX3 as an endpoint effector of MST/Hippo-mediated cell death and a direct repressor of ICAM-3, integrating it into apoptotic signaling and macrophage differentiation.\",\n      \"evidence\": \"Reciprocal Co-IP with SAV1/MST2, siRNA, cell-death assays, ChIP and reporter assays\",\n      \"pmids\": [\"21678419\", \"22479382\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RUNX3 transcriptional output mediates Hippo-induced death not mapped\", \"MST2 modification of RUNX3 not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided genome-wide evidence that RUNX3 binds RUNX/ETS-motif enhancers overlapping T-bet/p300 sites in CD8+ T and NK cells, defining its enhancer-level cooperativity and activation-expandable target set.\",\n      \"evidence\": \"ChIP-seq and transcriptome comparison of wild-type vs Runx3-/- primary cells; TSP-1 promoter binding in melanoma\",\n      \"pmids\": [\"24236182\", \"23846726\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal cofactor hierarchy at shared enhancers not dissected\", \"Direct vs indirect targets within the expanded set not separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established RUNX3 cooperation with ETS/T-box factors driving IL-15-dependent NK-cell maturation and demonstrated DNA-binding-dependent repression of survivin, refining both immune and tumor-suppressive mechanisms.\",\n      \"evidence\": \"Runx3 knockout mice, ChIP-seq, RNA-seq, in vivo NK quantification; ChIP/reporter with R122C mutagenesis; Co-IP with EWS/FLI\",\n      \"pmids\": [\"24421391\", \"24636883\", \"24812032\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of EWS/FLI sequestration of RUNX3 not fully resolved\", \"Direct uNK target genes not enumerated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined transcriptional silencing of RUNX3 by Nr4a1/CoREST in CD8+ T cells and a developmental requirement in osteoblast proliferation, expanding both its upstream regulation and tissue-specific roles.\",\n      \"evidence\": \"Nr4a1 knockout mice with ChIP; osteoblast-specific conditional knockout with histomorphometry and transcriptome\",\n      \"pmids\": [\"25762306\", \"25605327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct osteoblast target genes not fully mapped\", \"Link between Nr4a1 repression and lineage outcomes incomplete\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed RUNX3 programs CD8+ tissue-resident memory identity and acts at the G1-S restriction point in a pRb/Brd2/p21 complex, while loss promotes oxidative-damage-driven senescence\\u2014unifying its immune, cell-cycle, and tumor-suppressive functions.\",\n      \"evidence\": \"In vivo RNAi screen, conditional KO and overexpression, ATAC-seq; Co-IP three-protein complex reconstitution; HO-1/DSB/senescence assays; miR-182/HOXA9 axis ChIP and reporter\",\n      \"pmids\": [\"29211713\", \"28846108\", \"29074538\", \"29054094\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of pRb/Brd2 complex assembly across cell types not generalized\", \"Direct vs indirect contribution to residency gene network unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended RUNX3's anti-oncogenic repertoire to direct GLI1 ubiquitination (Hedgehog suppression) and YAP inhibition, and to sensory-neuron identity maintenance, broadening its mechanistic range beyond classical transcription.\",\n      \"evidence\": \"Co-IP and ubiquitination assays; interaction-dependent YAP functional assays; conditional Runx3 inactivation in PSNs with electrophysiology\",\n      \"pmids\": [\"31278361\", \"29581836\", \"31575648\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether GLI1 ubiquitination is RUNX3-intrinsic or scaffold-dependent unclear\", \"NT3-to-RUNX3 maintenance signaling pathway not detailed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined hypoxic G9a-mediated lysine methylation of RUNX3 (K129/K171) as an inactivation switch reducing CBF\\u03b2/p300 binding and import, and revealed an oncogenic gain-of-function context where RUNX3 drives MDS-like transformation in Tet2-deficient progenitors.\",\n      \"evidence\": \"In vitro methylation assays with mutagenesis, Co-IP, immunofluorescence; RUNX3-overexpressing Tet2-deficient mouse model with ChIP-seq/RNA-seq\",\n      \"pmids\": [\"33116296\", \"32341038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of tumor-suppressor vs oncogenic context-switching not resolved\", \"Reversibility of K-methylation in vivo not quantified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved the overlapping yet functionally distinct RUNX1/RUNX3 binding landscape during T-lineage commitment, clarifying redundancy and site-shifting that underlie their collaborative gene-regulatory program.\",\n      \"evidence\": \"Single and double Runx CRISPR knockouts, stage-specific ChIP-seq and RNA-seq\",\n      \"pmids\": [\"33479171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors driving site-shifting not fully identified\", \"Generality beyond T-progenitors untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Added new tissue-specific functions\\u2014endothelial RUNX3 loss driving paracrine liver fibrosis, ferroptosis induction via ING1/SLC7A11, articular cartilage maintenance via lubricin/aggrecan, and vagal sensory-neuron control of esophageal peristalsis\\u2014demonstrating broad organ-level roles.\",\n      \"evidence\": \"Endothelial- and chondrocyte-specific knockout mice, scRNA-seq, adenoviral rescue, ChIP/reporter ferroptosis assays, optogenetics and genetic ablation\",\n      \"pmids\": [\"39042837\", \"37156453\", \"36261443\", \"37192624\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect transcriptional targets in each tissue not fully separated\", \"Shared regulatory logic across these contexts not unified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"What molecular determinants switch RUNX3 between tumor-suppressive and oncogenic transcriptional output, and how its post-translational modifications, cofactor availability, and genomic site selection are integrated in a given cell state, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model for context-dependent activation vs repression\", \"Structural basis of CBF\\u03b2/p300 vs G9a competition undefined\", \"In vivo dynamics of the pRb/Brd2/RUNX3 cell-cycle complex unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 9, 11, 18, 27]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 8, 9, 11, 27, 31]},\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 6, 25]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 9, 11, 27]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 3, 13, 14, 24]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 7, 35]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5, 8, 27, 31]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 10, 21, 30, 32]}\n    ],\n    \"complexes\": [\n      \"RUNX3-pRb-Brd2 R-point complex\"\n    ],\n    \"partners\": [\n      \"CBFB\",\n      \"EP300\",\n      \"RB1\",\n      \"BRD2\",\n      \"SRC\",\n      \"G9a (EHMT2)\",\n      \"XRCC6 (Ku70)\",\n      \"YAP1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}