{"gene":"RUNX3","run_date":"2026-04-28T20:42:06","timeline":{"discoveries":[{"year":2002,"finding":"RUNX3 is a major growth regulator of gastric epithelial cells acting downstream of TGF-β; Runx3 null mouse gastric mucosa shows hyperplasia due to stimulated proliferation and suppressed apoptosis, and cells are resistant to TGF-β-induced growth inhibition and apoptosis. A Runt domain mutation (R122C) abolished tumor-suppressive activity, establishing the Runt domain as functionally essential.","method":"Runx3 knockout mouse model; primary gastric epithelial cell culture with TGF-β treatment; nude mouse tumorigenicity assay with RUNX3 expression variants; site-directed mutagenesis of Runt domain","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo KO phenotype + in vitro functional assay + mutagenesis, foundational paper with 896 citations","pmids":["11955451"],"is_preprint":false},{"year":2003,"finding":"Runx3 functions as a transcriptional repressor of CD4 expression during T cell lineage decisions in the thymus, and is required for CD8+ T cell maturation; compound Runx3-/-;Runx1+/- mice completely lack single-positive CD8+ T cells, indicating that Runx3 and Runx1 cooperate to repress CD4 and drive CD8 lineage commitment.","method":"Runx3 knockout mice; compound Runx3/Runx1 mutant mice; flow cytometry of thymic and peripheral T cell subsets; in vitro cytotoxicity assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype, genetic epistasis with Runx1, replicated in compound mutant","pmids":["12796513"],"is_preprint":false},{"year":2004,"finding":"Runx2 and Runx3 are both essential for chondrocyte maturation during endochondral ossification; Runx2-/-Runx3-/- double-knockout mice show complete absence of chondrocyte maturation and fail to express Indian hedgehog (Ihh). Runx2 directly binds the Ihh promoter and drives Ihh expression, linking Runx proteins to chondrocyte proliferation and maturation through Ihh induction.","method":"Runx2/Runx3 double-knockout mice; adenoviral Runx2 introduction in chondrocyte cultures; luciferase reporter assay with Ihh promoter; chromatin immunoprecipitation (promoter binding)","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo double-KO epistasis + in vitro promoter binding + reporter assay, 479 citations","pmids":["15107406"],"is_preprint":false},{"year":1998,"finding":"RUNX3 (CBFα3/AML2) is induced by TGF-β1 in B cells and binds two CBF binding sites in the TGF-β-responsive element (TβRE) of the germline Ig α promoter to activate IgA class switch transcription.","method":"TGF-β1 treatment of splenic B cells and I.29μ B cell line; EMSA demonstrating TGF-β1-inducible complex binding TβRE; overexpression of CBFα family members with luciferase reporter; promoter mutation analysis","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1-2 — EMSA + promoter mutagenesis + reporter assay, establishes direct DNA binding and TGF-β1 inducibility","pmids":["9862705"],"is_preprint":false},{"year":2009,"finding":"PTHrP prevents chondrocyte premature hypertrophy by inducing cyclin D1-dependent CDK4-mediated phosphorylation of Runx3 at Ser356, followed by ubiquitylation and proteasomal degradation. CDK4 directly phosphorylates GST-Runx3 in vitro; S356A mutation stabilizes Runx3 and confers resistance to cyclin D1-induced degradation.","method":"Pulse-chase experiments in COS/RCJ3.1C5.18 cells; co-immunoprecipitation of Runx3 with CDK4; in vitro CDK4 kinase assay with GST-Runx3; ubiquitylation assays; proteasome inhibitor rescue; Ccnd1-knockout mouse growth plates; primary chondrocyte PTHrP treatment","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay + mutagenesis + in vivo KO validation, multiple orthogonal methods","pmids":["19351720"],"is_preprint":false},{"year":2009,"finding":"RUNX3 is a target of MDM2-mediated ubiquitination; RUNX3 directly binds MDM2 through its Runt domain. MDM2 ubiquitinates RUNX3 on key lysine residues, promoting nuclear export and proteasomal degradation, thereby blocking RUNX3 transcriptional activity. This is stabilized when Ras activates the p14ARF-MDM2 pathway.","method":"Co-immunoprecipitation of RUNX3 and MDM2; in vitro ubiquitination assay; domain mapping by deletion mutants; siRNA knockdown; proteasomal degradation assays; Ras activation experiments","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding demonstrated by Co-IP, in vitro ubiquitination, domain mapping, multiple methods","pmids":["19808967"],"is_preprint":false},{"year":2009,"finding":"TGF-β induces RUNX1 and RUNX3 expression in CD4+ T cells, which then bind three RUNX binding sites in the FOXP3 promoter to drive Foxp3 expression and inducible regulatory T cell (iTreg) differentiation. CBFβ inactivation in mice and siRNA-mediated RUNX1/RUNX3 knockdown in human T cells reduces Foxp3 expression and iTreg suppressive function.","method":"TGF-β treatment of CD4+ T cells; siRNA knockdown of RUNX1/RUNX3; Cbfb conditional KO mice with adoptive transfer; ChIP showing RUNX binding at FOXP3 promoter; in vitro Treg suppression assays; immunofluorescence colocalization","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — ChIP at FOXP3 promoter + genetic KO + functional suppression assay, multiple orthogonal methods","pmids":["19917773"],"is_preprint":false},{"year":2010,"finding":"RUNX3 acts as a co-activator for p53 in DNA damage responses; RUNX3 forms a complex with p53 via the C-terminal portion of p53 (demonstrated by co-IP and GST pulldown), accumulates in the nucleus after DNA damage, promotes phosphorylation of p53 at Ser-15, and interacts with phosphorylated ATM, thereby enhancing p53-dependent transcription and apoptosis.","method":"siRNA knockdown of RUNX3; immunoprecipitation of RUNX3-p53 complex; in vitro GST pulldown mapping p53-RUNX3 interaction domains; luciferase reporter assay for p53 transcriptional activity; subcellular fractionation; immunofluorescence colocalization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro pulldown + Co-IP domain mapping + functional reporter assays + siRNA phenotype","pmids":["20353948"],"is_preprint":false},{"year":2010,"finding":"RUNX3 functions downstream of BMP signaling in colorectal cancer cells to suppress c-Myc expression via two parallel pathways: direct transcriptional repression of c-Myc and attenuation of β-catenin/TCF transactivation, thereby mediating growth-suppressive effects of BMP.","method":"BMP treatment of HT-29 colorectal cancer cells; RUNX3 overexpression and knockdown; luciferase reporter assays for c-Myc promoter and TCF activity; Western blot for c-Myc and β-catenin","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — pathway placement by epistasis + reporter assays, single lab","pmids":["20442291"],"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 the SAV1-RUNX3 interaction. RUNX3 acts as an endpoint effector of MST, and siRNA knockdown of RUNX3 abolishes MST/Hpo-mediated cell death.","method":"Co-immunoprecipitation of RUNX3 with MST2 and SAV1; siRNA knockdown of RUNX3 with MST-induced apoptosis readout","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP interaction + functional siRNA readout, single lab","pmids":["21678419"],"is_preprint":false},{"year":2017,"finding":"Runx3 is a key transcription factor required for tissue-resident memory CD8+ T (TRM) cell differentiation and homeostasis; Runx3 establishes TRM cell populations across diverse tissue environments by supporting tissue-residency genes and suppressing tissue-egress genes. Runx3 overexpression in adoptively transferred CD8+ T cells enhanced tumor-specific T cell accumulation and delayed tumor growth.","method":"Pooled in vivo RNAi screen; Runx3 conditional KO mice; chromatin accessibility and gene expression profiling of TRM precursors; adoptive T cell transfer in melanoma mouse model; overexpression of Runx3 in CD8+ T cells","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — in vivo RNAi screen + genetic KO + gain-of-function in vivo, 548 citations, multiple orthogonal approaches","pmids":["29211713"],"is_preprint":false},{"year":2014,"finding":"Runx3 regulates interleukin-15-dependent natural killer (NK) cell activation; loss of Runx3 impairs IL-15-dependent accumulation of mature NK cells. ChIP-seq combined with differential gene expression showed Runx3 cooperates with ETS and T-box transcription factors to drive the IL-15-mediated transcription program regulating NK cell proliferation, maturation, and migration.","method":"Runx3-/- mice; in vivo NK cell quantification; ChIP-seq of Runx3 binding in activated NK cells; differential gene expression analysis of WT vs Runx3-deficient NK cells; uterine NK cell analysis in pregnant Runx3-/- mice","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO phenotype + genome-wide ChIP-seq + transcriptomics, multiple orthogonal methods","pmids":["24421391"],"is_preprint":false},{"year":2006,"finding":"Runx3 regulates development of skin dendritic epidermal T cells (DETCs) by controlling expression of CD103 (αEβ7 integrin) and IL-2Rβ; absence of Runx3 reduces CD103 and IL-2Rβ on DETC precursors, impairing proliferation and maturation, leading to complete loss of skin DETCs.","method":"Runx3-/- mice; flow cytometry and histology of skin DETCs; gene expression analysis of CD103 and IL-2Rβ","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype and target gene identification, single lab","pmids":["17222403"],"is_preprint":false},{"year":2015,"finding":"Nr4a1 (nuclear receptor) directly suppresses Runx3 expression in CD8+ T cells by recruiting the corepressor CoREST to the Runx3 locus; loss of Nr4a1 increases Runx3 expression in thymocytes, resulting in a 2-fold increase in CD8+ T cell frequency.","method":"Nr4a1 knockout mice; ChIP showing Nr4a1 and CoREST binding at Runx3 locus; flow cytometry of CD8+ T cell subsets in thymus and periphery","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP of transcriptional repressor at Runx3 locus + KO phenotype, single lab","pmids":["25762306"],"is_preprint":false},{"year":2017,"finding":"During the restriction point (R-point), Runx3 transiently forms a complex with pRb and Brd2 and induces expression of p21 (Cdkn1a), a key R-point regulator. Cyclin D-CDK4/6 promotes dissociation of the pRb-Runx3-Brd2 complex to turn off p21 expression. Runx3-/- MEFs have dysregulated R-point and form tumors in nude mice; ectopic Runx3 restores R-point control.","method":"Runx3-/- mouse embryonic fibroblasts; Co-immunoprecipitation of Runx3-pRb-Brd2 complex; ectopic expression of Runx3 restoring R-point; nude mouse tumorigenicity; Cyclin D1 treatment dissociating complex; K-Ras activation experiments","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — Co-IP of trimeric complex + in vivo tumor rescue + mechanistic dissection with cyclin D1, multiple methods","pmids":["28846108"],"is_preprint":false},{"year":2017,"finding":"TGFβ promotes DNA double-strand breaks (genomic instability) in RUNX3-deficient cancer cells by downregulating the redox regulator heme oxygenase-1 (HO-1/HMOX1), which is a transcriptional target of RUNX3; loss of RUNX3 reduces HO-1, elevates oxidative DNA damage, triggers cellular senescence and SASP.","method":"RUNX3 KO/knockdown in cancer cells; TGFβ treatment; measurement of DSBs and oxidative damage; transcriptional analysis of HO-1; SASP assay; tumor genomic instability analysis","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined molecular mechanism (HO-1 transcriptional target) + multiple phenotypic readouts, single lab","pmids":["29074538"],"is_preprint":false},{"year":2020,"finding":"G9a (lysine methyltransferase KMT2C) methylates RUNX3 at K129 and K171 under hypoxia; G9a interacts with the RUNX3 Runt domain. This methylation inactivates RUNX3 transcriptional activity by reducing interactions with CBFβ and p300 cofactors, reducing p300-mediated RUNX3 acetylation, and impairing nuclear import via importin-α1, thereby promoting cancer cell proliferation and suppressing apoptosis.","method":"Co-immunoprecipitation of G9a-RUNX3; in vitro methylation assay; mass spectrometry identification of methylation sites K129/K171; domain mapping; interaction assays with CBFβ and p300; importin-α1 interaction; cell proliferation and apoptosis assays","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro methylation assay + mass spec site identification + multiple interaction partner studies, mechanistically comprehensive","pmids":["33116296"],"is_preprint":false},{"year":2007,"finding":"Runx3 interacts with DNA repair protein Ku70; the interaction was identified by proteomic pulldown and confirmed by His-tag in vitro pulldown. The interaction domain maps to amino acids 241-322 of Runx3 (transcriptional activation domain) and amino acids 1-116 of Ku70. Ku70 knockdown increases Runx3-driven p21 transcription, suggesting Ku70 modulates Runx3 transcriptional activity.","method":"Affinity purification of MEF-tagged Runx3 complex + mass spectrometry; His-tag in vitro pulldown; co-immunoprecipitation in vivo; domain deletion mapping; siRNA knockdown of Ku70 with p21 reporter; confocal immunocytochemistry","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro pulldown + Co-IP + domain mapping + functional consequence of KD, single lab","pmids":["17662272"],"is_preprint":false},{"year":2007,"finding":"Runx3 directly binds the Osterix (Sp7) promoter at a RUNX binding site (-713 to -707 bp) and transcriptionally represses Osterix expression in dental pulp cells; mutation of this site abolishes repression. Confirmed by EMSA and ChIP in mouse dental pulp cells.","method":"Luciferase reporter assay with Osterix promoter in HEK293T cells; promoter site-directed mutagenesis; EMSA; ChIP in mouse dental pulp cells","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — direct promoter binding by EMSA + ChIP + mutagenesis, multiple orthogonal methods","pmids":["17352693"],"is_preprint":false},{"year":2006,"finding":"RUNX3 negatively regulates CD36 expression in myeloid cells; RUNX3 binds two functional RUNX-binding elements in the CD36 gene proximal regulatory region in vitro and in vivo (ChIP), and overexpression of RUNX3 drastically reduces CD36 expression.","method":"EMSA identifying RUNX binding sites in CD36 promoter; ChIP showing RUNX3 occupancy at CD36 regulatory region; RUNX3 overexpression in myeloid cells with CD36 protein measurement","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — EMSA + ChIP + overexpression functional readout, single lab","pmids":["16887969"],"is_preprint":false},{"year":2012,"finding":"RUNX3 negatively regulates ICAM-3 gene expression in myeloid cells during macrophage differentiation and monocyte extravasation; RUNX3 occupies RUNX cognate sequences in the ICAM-3 promoter in vivo, and disruption of RUNX-binding sites or siRNA-mediated reduction of RUNX3 results in increased ICAM-3 mRNA levels.","method":"ICAM-3 promoter luciferase assay; ChIP showing RUNX occupancy; siRNA knockdown of RUNX3 with ICAM-3 mRNA quantification; RUNX binding site mutagenesis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + promoter mutagenesis + siRNA functional assay, single lab","pmids":["22479382"],"is_preprint":false},{"year":2014,"finding":"RUNX3 suppresses gastric cancer cell invasion and vimentin expression by transcriptionally activating miR-30a, which directly targets the 3' UTR of vimentin; miR-30a inhibitor abrogates RUNX3-mediated suppression of invasion and vimentin downregulation.","method":"RUNX3 overexpression and knockdown; invasion assays; Western blot for vimentin; miR-30a quantification; 3'UTR luciferase reporter for vimentin-miR-30a targeting; miR-30a inhibitor rescue experiments; nude mouse colonization assay","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — 3'UTR reporter + inhibitor rescue + in vivo assay, single lab, moderate evidence","pmids":["24447545"],"is_preprint":false},{"year":2017,"finding":"RUNX3 directly binds the promoter region of miR-182 (confirmed by ChIP) and transcriptionally suppresses it; miR-182 directly targets HOXA9. Thus, RUNX3 inhibits gastric cancer cell proliferation and metastasis via the miR-182/HOXA9 axis.","method":"ChIP showing RUNX3 binding to miR-182 promoter; luciferase reporter for HOXA9 as miR-182 target; overexpression/knockdown of RUNX3; rescue experiments with miR-182 mimics; in vivo xenograft mouse model","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP at miR-182 promoter + luciferase validation of HOXA9 target + in vivo, single lab","pmids":["29054094"],"is_preprint":false},{"year":2015,"finding":"Loss of osteoblast-specific Runx3 causes severe congenital osteopenia; Runx3 is expressed in precommitted embryonic osteoblasts and is required for osteoblast proliferation (not apoptosis) to generate adequate numbers of active osteoblasts. Osteoblast-specific Runx3 (Col1α1-cre) but not chondrocyte-specific (Col1α2-cre) KO mice are osteopenic.","method":"Conditional Runx3 KO mice with Col1α1-Cre and Col1α2-Cre drivers; bone histomorphometry; primary osteoblast culture proliferation assays; transcriptome analysis of Runx3-null bone","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with cell-type specificity + histomorphometry + transcriptomics, cell-autonomous osteoblastic function established","pmids":["25605327"],"is_preprint":false},{"year":2019,"finding":"RUNX3 directly interacts with GLI1 and promotes its ubiquitination by E3 ligase β-TrCP, thereby inhibiting Hedgehog signaling and suppressing cancer stem cell properties and metastasis in colorectal cancer.","method":"Co-immunoprecipitation of RUNX3-GLI1; ubiquitination assay; β-TrCP identification as the E3 ligase; inverse correlation of RUNX3 and GLI1 in CRC tissues; functional assays for stemness and metastasis","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP + ubiquitination assay + E3 ligase identification, single lab","pmids":["31278361"],"is_preprint":false},{"year":2005,"finding":"RUNX3 regulates expression of CD11a (LFA-1) and CD49d (VLA-4) integrin gene promoters; RUNX3 overexpression leads to enhanced CD11a/CD18 levels, and RUNX3 transactivates the CD49d gene promoter through RUNX-binding elements.","method":"Luciferase reporter assays for CD11a and CD49d promoters; RUNX3 overexpression; correlation of RUNX3 mRNA with CD49d during dendritic cell maturation","journal":"Immunobiology","confidence":"Low","confidence_rationale":"Tier 3 — reporter assays and expression correlation, no ChIP confirmation of binding","pmids":["16164020"],"is_preprint":false},{"year":2021,"finding":"Runx1 and Runx3 are coexpressed in single pro-T cells, bind highly overlapping genomic sites, and have redundant collaborative functions in T cell lineage commitment; they preferentially activate T-lineage genes and repress multipotent progenitor genes at stage-specific loci, shifting binding sites extensively during commitment.","method":"Single and double Runx1/Runx3 CRISPR/Cas9 knockouts in pro-T cells; ChIP-seq mapping of Runx1 and Runx3 binding sites across stages; gene expression profiling; partner factor cobinding analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — CRISPR double KO + genome-wide ChIP-seq + transcriptomics, mechanistically comprehensive","pmids":["33479171"],"is_preprint":false},{"year":2022,"finding":"Runx3 protects adult articular chondrocytes by transcriptionally driving lubricin and aggrecan expression; Runx3-knockout mice show accelerated osteoarthritis with decreased lubricin and aggrecan. Intra-articular administration of Runx3 adenovirus ameliorated surgically induced osteoarthritis.","method":"Runx3-KO mice with surgical OA induction; Runx2 conditional KO mice; comprehensive transcriptional analysis identifying lubricin and aggrecan as Runx3 target genes; intra-articular adenoviral Runx3 delivery","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO phenotype + target gene identification by transcriptomics + therapeutic gain-of-function, multiple approaches","pmids":["36261443"],"is_preprint":false},{"year":2020,"finding":"RUNX3 overexpression in MDS suppresses RUNX1 and its target genes (Cebpa, Csf1r) by binding and remodeling their Runx1-binding regions in Tet2-deficient cells; RUNX3 also activates Myc target genes. In a Tet2-deficient mouse model, RUNX3 overexpression drives MDS-like disease.","method":"RUNX3-expressing Tet2-deficient mouse model; ChIP-seq of RUNX3 at Runx1 target gene loci; gene expression analysis; pharmacological MYC-MAX inhibition showing sensitivity","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — in vivo mouse model + ChIP-seq mechanistic dissection + pharmacological validation, multiple methods","pmids":["32341038"],"is_preprint":false},{"year":2017,"finding":"MYC transcriptionally drives RUNX3 expression in NK/T-cell lymphoma (NKTL) by binding to the RUNX3 enhancer region; ChIP-qPCR confirmed MYC binding to the RUNX3 enhancer, and co-transfection of MYC with RUNX3 enhancer reporter activated transcription. In NKTL, RUNX3 has oncogenic function promoting proliferation and survival.","method":"ChIP-qPCR showing MYC binding at RUNX3 enhancer; luciferase reporter assay with RUNX3 enhancer + MYC co-transfection; MYC inhibitor (JQ1) treatment; RUNX3 silencing with apoptosis/proliferation readout","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP showing direct upstream regulation + functional reporter + pharmacological validation, single lab","pmids":["28119527"],"is_preprint":false},{"year":2024,"finding":"Endothelial RUNX3 maintains liver sinusoidal endothelial cell (LSEC) function; endothelial Runx3-deficient mice develop spontaneous liver fibrosis via IL-6/JAK/STAT3 pathway activation. RUNX3-deficient LSECs secrete LRG1, which activates hepatic stellate cells through TGFBR1-SMAD2/3 signaling in a paracrine manner.","method":"Endothelial-specific Runx3 KO mice (spontaneous fibrosis phenotype); single-cell RNA sequencing of liver; in vitro LSEC mechanistic studies; co-culture experiments with LRG1 and HSCs; TGFBR1-SMAD2/3 signaling assays; clinical LRG1 measurement in patients","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO in vivo + scRNA-seq + co-culture mechanistic dissection + pathway identification, multiple orthogonal methods","pmids":["39042837"],"is_preprint":false},{"year":2013,"finding":"Thrombospondin-1 (TSP-1) is a transcriptional target of Runx3; Runx3 expression strongly induces TSP-1 at both mRNA and protein levels in B16-F10 melanoma cells, and Runx3 binds the TSP-1 promoter and stimulates reporter activity.","method":"PCR-based cDNA subtraction identifying TSP-1 upregulation by Runx2/Runx3; TSP-1 promoter luciferase reporter assay; Western blot and RT-PCR for TSP-1 upon Runx3 expression in melanoma cells","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 — reporter assay + overexpression, no ChIP confirmation of direct binding, single lab","pmids":["23846726"],"is_preprint":false},{"year":2023,"finding":"RUNX3 induces ferroptosis in gallbladder cancer by activating ING1 transcription (confirmed by ChIP and dual-luciferase assay), which then represses SLC7A11 in a p53-dependent manner; DNMT1-mediated methylation of the RUNX3 promoter silences this pathway.","method":"Bisulfite sequencing PCR; dual-luciferase reporter assay; ChIP assay for RUNX3 at ING1 promoter; gain- and loss-of-function assays; in vitro and in vivo ferroptosis assays","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + luciferase reporter + in vivo functional assay, single lab, moderate evidence","pmids":["37156453"],"is_preprint":false},{"year":2023,"finding":"Runx3-expressing vagal sensory neuron subtypes (co-expressing Prox2 and Runx3) innervate the esophagus as intraganglionic laminar endings and are low-threshold mechanoreceptors; genetic ablation of Prox2/Runx3 neurons abolishes esophageal peristalsis in freely behaving mice.","method":"Genetically guided anatomical tracing; optogenetics; electrophysiology; genetic ablation of Prox2/Runx3-expressing neurons with esophageal motility readout","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — genetic ablation with defined motor phenotype + electrophysiology + optogenetics, multiple orthogonal approaches","pmids":["37192624"],"is_preprint":false},{"year":2019,"finding":"Runx3 controls muscle-specific aspects of sensorimotor circuit formation; conditional inactivation of Runx3 in proprioceptive sensory neurons (PSNs) after peripheral innervation reveals that Runx3 maintains PSN subgroup cell identity and controls sensorimotor connections with muscle-by-muscle variable sensitivity. Target muscles and neurotrophin-3 signaling are required to maintain Runx3 expression in PSNs.","method":"Conditional Runx3 inactivation in PSNs after peripheral innervation; anatomical tracing of sensorimotor connections; NT-3 signaling perturbation; in situ hybridization and immunohistochemistry","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with defined circuit phenotype + upstream signal identification, single lab","pmids":["31575648"],"is_preprint":false},{"year":2004,"finding":"RUNX3 reinstates TGF-β responsiveness in Barrett's-derived esophageal adenocarcinoma cells (SEG-1) that lack RUNX3; transfection of RUNX3 restores Smad-mediated TGF-β transcriptional activity and enables TGF-β-induced antiproliferation and apoptosis.","method":"RUNX3 transfection into SEG-1 cells; dual-luciferase assay for Smad-mediated TGF-β transcription; proliferation and apoptosis assays with TGF-β treatment","journal":"Surgery","confidence":"Medium","confidence_rationale":"Tier 2 — gain-of-function + reporter assay demonstrating pathway restoration, single lab","pmids":["15300196"],"is_preprint":false},{"year":2018,"finding":"RUNX1 and RUNX3 interact with YAP (Hippo pathway effector) and act as negative regulators of its oncogenic function; RUNX1/RUNX3 inhibit YAP-mediated migration and stemness in mammary epithelial cells in an interaction-dependent manner and co-regulate YAP-mediated gene expression.","method":"Co-immunoprecipitation of RUNX1/RUNX3 with YAP; RUNX1/RUNX3 overexpression with YAP; migration and stemness assays in mammary epithelial cell lines; gene expression profiling","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP establishing interaction + functional assays, single lab","pmids":["29581836"],"is_preprint":false},{"year":2010,"finding":"miR-130b directly targets and downregulates RUNX3 protein in gastric cancer cells, reducing TGF-β-mediated apoptosis (via Bim) and increasing cell viability; demonstrated by luciferase reporter assay and Western blot.","method":"Bioinformatic prediction + luciferase reporter assay for miR-130b targeting RUNX3 3'UTR; miR-130b precursor/inhibitor transfection; cell viability, apoptosis, and Bim expression assays","journal":"European journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 — 3'UTR reporter + functional phenotype, single lab","pmids":["20176475"],"is_preprint":false},{"year":2007,"finding":"Runx3 is expressed in early and late chondrocyte differentiation and transcriptionally inhibits Runx1 expression in chondrocytes; Runx3 gain and loss of function regulates both early and late markers of chondrocyte maturation.","method":"Real-time RT-PCR of Runx3 in embryonic development; Runx3 overexpression and siRNA knockdown in chondrogenic cell lines; luciferase reporter assay of Runx1 promoter driven by Runx3","journal":"Journal of bone and mineral research","confidence":"Medium","confidence_rationale":"Tier 2 — gain/loss of function with defined target gene (Runx1) + reporter assay, single lab","pmids":["17488194"],"is_preprint":false},{"year":2006,"finding":"RUNX3 protein is frequently mislocalized to the cytoplasm in breast cancer (35/44 primary tumors), which is a distinct mechanism of inactivation separate from promoter hypermethylation; cytoplasmic RUNX3 cannot perform its growth-suppressive function. Stable nuclear RUNX3 expression in MDA-MB-231 cells reduced invasiveness and tumor formation.","method":"IHC and subcellular fractionation of RUNX3 in primary breast cancer specimens; stable RUNX3 expression in MDA-MB-231 cells; Matrigel invasion assay; nude mouse tumor formation assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2-3 — localization tied to functional consequence (invasion, tumorigenicity), single lab","pmids":["16818622"],"is_preprint":false},{"year":2018,"finding":"Runx3 regulates folliculogenesis and steroidogenesis in ovarian granulosa cells; Runx3-/- mice have reduced primary and antral follicles, decreased expression of activin/inhibin subunits (Inha, Inhba, Inhbb), and decreased steroidogenic enzyme genes Cyp11a1 and Cyp19a1. Cultured Runx3-/- granulosa cells show impaired FSH-induced Cyp19a1 induction.","method":"Runx3 knockout mice (ovarian histology and follicle counting); gene expression analysis by qPCR in ovaries; primary granulosa cell culture with FSH treatment","journal":"Cell and tissue research","confidence":"Medium","confidence_rationale":"Tier 2 — KO with defined cellular and molecular phenotype, primary cell culture validation, single lab","pmids":["30377784"],"is_preprint":false}],"current_model":"RUNX3 is a Runt-domain transcription factor that functions downstream of TGF-β/BMP/Hippo signaling to regulate cell proliferation, apoptosis, and lineage specification: it directly binds target gene promoters (Ihh, Foxp3, Osterix, miR-182, ING1, ICAM-3, CD36, TSP-1) via its Runt domain, forms functional complexes with co-regulators (CBFβ, p53, pRb-Brd2, MST2-SAV1, YAP), and is post-translationally regulated by CDK4-mediated phosphorylation at Ser356 (leading to ubiquitylation and proteasomal degradation), G9a-mediated lysine methylation at K129/K171 (impairing nuclear import and cofactor interactions), and MDM2-mediated ubiquitination (promoting nuclear export), while its nuclear localization is essential for tumor suppressor activity; in immune cells, RUNX3 is a master regulator of CD8+ T cell and tissue-resident memory T cell differentiation, NK cell activation, and iTreg function, and in cancer contexts can function as either a tumor suppressor (gastric, colorectal, lung, bladder) or an oncogene (NKTL, HNSCC, MDS), depending on cellular context and co-regulatory partners."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing that RUNX3 is a TGF-β-inducible transcription factor that directly binds DNA to activate gene expression resolved its initial molecular identity as a signal-responsive transcriptional activator.","evidence":"TGF-β1 treatment of B cells with EMSA and luciferase reporter assays on the germline Igα promoter","pmids":["9862705"],"confidence":"High","gaps":["No genome-wide binding data at this stage","Mechanism of TGF-β-mediated RUNX3 induction not defined"]},{"year":2002,"claim":"Demonstrating that Runx3 loss causes gastric epithelial hyperplasia through loss of TGF-β-mediated growth inhibition and apoptosis established RUNX3 as a bona fide tumor suppressor and linked its Runt domain to this function.","evidence":"Runx3 knockout mouse with gastric hyperplasia; TGF-β resistance in primary cells; R122C Runt domain mutation abolishing suppression; tumorigenicity assays","pmids":["11955451"],"confidence":"High","gaps":["Direct transcriptional targets mediating tumor suppression not identified","Whether tumor-suppressive function extends beyond gastric epithelium unknown"]},{"year":2003,"claim":"Showing that Runx3 represses CD4 and is required for CD8+ T cell maturation—with Runx1 acting redundantly—revealed RUNX3's central role in T cell lineage decisions.","evidence":"Runx3 KO and compound Runx3/Runx1 mutant mice with flow cytometry of thymic subsets","pmids":["12796513"],"confidence":"High","gaps":["Direct CD4 silencer binding by Runx3 not shown at this stage","Downstream gene program not characterized genome-wide"]},{"year":2004,"claim":"The discovery that Runx2/Runx3 double knockout abolishes chondrocyte maturation and Ihh expression established functional redundancy among Runx family members in skeletal development and identified Ihh as a direct transcriptional target.","evidence":"Runx2/Runx3 double-KO mice; ChIP and reporter assays on the Ihh promoter","pmids":["15107406"],"confidence":"High","gaps":["Relative contributions of Runx2 vs Runx3 to individual target genes not delineated","Post-translational regulation in chondrocytes unexplored"]},{"year":2006,"claim":"Identifying cytoplasmic mislocalization of RUNX3 in breast cancer as a distinct inactivation mechanism, and showing that nuclear RUNX3 directly regulates CD36 and ICAM-3 in myeloid cells, broadened understanding of both its tumor suppressor inactivation and immune-cell transcriptional programs.","evidence":"IHC/subcellular fractionation in breast tumors with invasion/tumorigenicity assays; EMSA and ChIP at CD36 and ICAM-3 promoters with overexpression/knockdown","pmids":["16818622","16887969","17222403"],"confidence":"Medium","gaps":["Mechanism driving cytoplasmic mislocalization not identified","No ChIP confirmation for integrin targets CD11a/CD49d"]},{"year":2007,"claim":"Mapping Runx3 interaction with Ku70 and demonstrating direct repression of the Osterix promoter expanded the catalog of RUNX3 partners and transcriptional targets in skeletal and DNA repair contexts.","evidence":"Affinity purification/mass spectrometry identifying Ku70; in vitro pulldown and Co-IP mapping domains; ChIP and EMSA at the Osterix promoter; Runx3 gain/loss of function in chondrocytes","pmids":["17662272","17352693","17488194"],"confidence":"Medium","gaps":["Functional significance of Ku70 interaction in DNA repair not tested in vivo","Whether Osterix repression is physiologically relevant in osteoblasts vs dental cells unclear"]},{"year":2009,"claim":"Elucidating two post-translational degradation pathways—CDK4 phosphorylation at Ser356 and MDM2-mediated ubiquitination—revealed how RUNX3 protein levels are dynamically controlled in proliferating and oncogene-activated cells, and RUNX3's direct binding to the FOXP3 promoter established its role in iTreg differentiation.","evidence":"In vitro CDK4 kinase assay with S356A mutagenesis and Ccnd1-KO mice; Co-IP/ubiquitination assays for MDM2-RUNX3; ChIP at FOXP3 promoter with Cbfb conditional KO and Treg suppression assays","pmids":["19351720","19808967","19917773"],"confidence":"High","gaps":["Identity of the E3 ligase for CDK4-dependent ubiquitylation unknown","Whether MDM2-mediated export occurs in non-cancer contexts untested","Relative importance of RUNX3 vs RUNX1 at the FOXP3 promoter unclear"]},{"year":2010,"claim":"Demonstrating that RUNX3 cooperates with p53 in the DNA damage response and suppresses c-Myc downstream of BMP signaling established RUNX3 as an integrator of multiple tumor-suppressive signaling pathways.","evidence":"Co-IP and GST pulldown of RUNX3-p53; p53 transcriptional reporters and ATM interaction; BMP treatment with c-Myc and TCF reporter assays in colorectal cancer cells","pmids":["20353948","20442291"],"confidence":"High","gaps":["Structural basis of p53–RUNX3 interaction unknown","Direct BMP-responsive element in RUNX3 gene not mapped"]},{"year":2012,"claim":"Placing RUNX3 downstream of the MST/Hippo pathway as an effector mediating MST-induced apoptosis linked RUNX3 to a fourth major growth-control signaling axis.","evidence":"Co-immunoprecipitation of RUNX3 with MST2 and SAV1; siRNA knockdown ablating MST-mediated cell death","pmids":["21678419"],"confidence":"Medium","gaps":["No direct phosphorylation or other post-translational modification by MST on RUNX3 demonstrated","Single lab; not independently replicated"]},{"year":2015,"claim":"Conditional knockout studies established a cell-autonomous role for Runx3 in osteoblast proliferation and bone mass maintenance, distinct from its chondrocyte functions.","evidence":"Osteoblast-specific (Col1α1-Cre) vs chondrocyte-specific (Col1α2-Cre) Runx3 KO mice with bone histomorphometry and primary osteoblast culture","pmids":["25605327"],"confidence":"High","gaps":["Direct osteoblast target genes not identified by ChIP","Relationship to Runx2 in this lineage not fully resolved"]},{"year":2017,"claim":"Multiple 2017 studies consolidated RUNX3's role at the restriction point via a pRb–Brd2 complex, in tissue-resident memory CD8+ T cell differentiation, and as an MYC-driven oncogene in NK/T-cell lymphoma, revealing its fundamentally context-dependent function.","evidence":"Co-IP of pRb-Runx3-Brd2 with cyclin D dissociation and Runx3-null MEF tumorigenesis; in vivo RNAi screen and conditional KO for TRM cells; ChIP-qPCR of MYC at RUNX3 enhancer in NKTL","pmids":["28846108","29211713","28119527"],"confidence":"High","gaps":["Structural determinants of pRb–Brd2–RUNX3 complex formation unknown","Whether RUNX3 overexpression in NKTL bypasses normal post-translational controls not tested","Chromatin remodeling targets in TRM program not fully delineated"]},{"year":2020,"claim":"Identifying G9a-mediated methylation at K129/K171 as a mechanism that inactivates RUNX3 by disrupting CBFβ/p300 interactions and nuclear import revealed a hypoxia-responsive epigenetic layer of RUNX3 regulation, while RUNX3 overexpression in Tet2-deficient MDS showed it can suppress RUNX1 targets and activate MYC programs.","evidence":"In vitro methylation assay with mass spectrometry; interaction assays with CBFβ, p300, importin-α1; ChIP-seq of RUNX3 in Tet2-deficient mouse MDS model","pmids":["33116296","32341038"],"confidence":"High","gaps":["Whether G9a methylation occurs in non-cancer contexts not established","Whether demethylases reverse RUNX3 methylation unknown","Mechanism of RUNX3 overexpression in human MDS not defined"]},{"year":2021,"claim":"Genome-wide ChIP-seq in pro-T cells demonstrated that Runx1 and Runx3 bind highly overlapping sites and have redundant functions in T-lineage commitment, resolving the question of why single knockouts show incomplete phenotypes.","evidence":"CRISPR single and double Runx1/Runx3 KO in pro-T cells with ChIP-seq and transcriptomics","pmids":["33479171"],"confidence":"High","gaps":["How stage-specific binding site shifts are encoded at the chromatin level remains unclear","Cofactor requirements for Runx binding specificity at individual loci not resolved"]},{"year":2022,"claim":"Demonstrating that Runx3 maintains articular cartilage by driving lubricin and aggrecan expression, and that adenoviral Runx3 delivery ameliorates osteoarthritis, established a protective role distinct from developmental chondrocyte maturation.","evidence":"Runx3-KO mice with surgical OA; transcriptomics identifying lubricin/aggrecan as targets; intra-articular adenoviral Runx3 rescue","pmids":["36261443"],"confidence":"High","gaps":["Direct promoter binding of Runx3 at lubricin and aggrecan loci not confirmed by ChIP","Long-term safety and efficacy of adenoviral Runx3 not assessed"]},{"year":2024,"claim":"Endothelial-specific Runx3 deletion causing spontaneous liver fibrosis via LRG1-TGFBR1-SMAD2/3 paracrine signaling revealed a previously unrecognized non-epithelial, non-immune role for RUNX3 in vascular homeostasis.","evidence":"Endothelial-specific Runx3 KO mice; scRNA-seq; LSEC-hepatic stellate cell co-culture; LRG1-TGFBR1-SMAD2/3 pathway analysis","pmids":["39042837"],"confidence":"High","gaps":["Whether RUNX3 directly represses LRG1 transcription not shown","Relevance to human liver fibrosis beyond LRG1 serum correlation not demonstrated"]},{"year":null,"claim":"Key unresolved questions include: the structural basis for RUNX3's interaction with its diverse partners (p53, pRb-Brd2, YAP, MDM2); the mechanisms selecting RUNX3 as tumor suppressor versus oncogene in different cellular contexts; and whether pharmacological reactivation of silenced RUNX3 (by demethylation or blocking G9a/MDM2) has therapeutic potential.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal structure of RUNX3 with any partner complex available","Context-dependent switch between tumor suppressor and oncogene roles mechanistically undefined","No therapeutic modulation of RUNX3 activity tested in clinical settings"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,3,6,18,19,20,22,26]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,3,6,8,14,18,19,22,27,28,32]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,7,9,24,36]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,7,16,39]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,39]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,3,6,8,18,19,22,27,28,32]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,8,9,35,36]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4,14]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,6,10,11,12,26]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,23,34]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,7,32]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[28,29,39]}],"complexes":["RUNX3-CBFβ","pRb-RUNX3-Brd2"],"partners":["CBFB","TP53","RB1","BRD2","MDM2","YAP1","EHMT2","XRCC6"],"other_free_text":[]},"mechanistic_narrative":"RUNX3 is a Runt-domain transcription factor that functions as a context-dependent regulator of cell proliferation, apoptosis, and lineage specification across epithelial, immune, skeletal, and neuronal tissues. It acts downstream of TGF-β and BMP signaling to mediate growth inhibition and apoptosis in gastric and colorectal epithelial cells—where it directly represses c-Myc and activates p21—and cooperates with p53 in the DNA damage response by promoting p53 Ser-15 phosphorylation and forming a transient pRb–Brd2 complex at the restriction point [PMID:11955451, PMID:20353948, PMID:28846108, PMID:20442291]. In the immune system, RUNX3 is essential for CD8+ T cell maturation, tissue-resident memory T cell differentiation, NK cell activation, and iTreg function through direct transcriptional control of CD4 silencing, FOXP3, and IL-15-dependent gene programs [PMID:12796513, PMID:29211713, PMID:19917773, PMID:24421391]. RUNX3 is post-translationally regulated by CDK4-mediated phosphorylation at Ser356 triggering proteasomal degradation, MDM2-mediated ubiquitination promoting nuclear export, and G9a-mediated methylation at K129/K171 impairing CBFβ/p300 interactions and nuclear import; cytoplasmic mislocalization constitutes a major inactivation mechanism in cancer [PMID:19351720, PMID:19808967, PMID:33116296, PMID:16818622]."},"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. RUNX members modulate the transcription of their target genes through recognizing the core consensus binding sequence 5'-TGTGGT-3', or very rarely, 5'-TGCGGT-3', within their regulatory regions via their runt domain, while CBFB is a non-DNA-binding regulatory subunit that allosterically enhances the sequence-specific DNA-binding capacity of RUNX. The heterodimers bind to the core site of a number of enhancers and promoters, including murine leukemia virus, polyomavirus enhancer, T-cell receptor enhancers, LCK, IL3 and GM-CSF promoters (By similarity). May be involved in the control of cellular proliferation and/or differentiation. In association with ZFHX3, up-regulates CDKN1A promoter activity following TGF-beta stimulation (PubMed:20599712). CBF complexes repress ZBTB7B transcription factor during cytotoxic (CD8+) T cell development. They bind to RUNX-binding sequence within the ZBTB7B locus acting as transcriptional silencer and allowing for cytotoxic T cell differentiation. 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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RUNX1 to Drive Transformation of Myelodysplastic Syndrome.","date":"2020","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/32341038","citation_count":15,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50264,"output_tokens":10927,"usd":0.157349},"stage2":{"model":"claude-opus-4-6","input_tokens":14952,"output_tokens":4370,"usd":0.276015},"total_usd":0.433364,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"RUNX3 is a major growth regulator of gastric epithelial cells acting downstream of TGF-β; Runx3 null mouse gastric mucosa shows hyperplasia due to stimulated proliferation and suppressed apoptosis, and cells are resistant to TGF-β-induced growth inhibition and apoptosis. A Runt domain mutation (R122C) abolished tumor-suppressive activity, establishing the Runt domain as functionally essential.\",\n      \"method\": \"Runx3 knockout mouse model; primary gastric epithelial cell culture with TGF-β treatment; nude mouse tumorigenicity assay with RUNX3 expression variants; site-directed mutagenesis of Runt domain\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo KO phenotype + in vitro functional assay + mutagenesis, foundational paper with 896 citations\",\n      \"pmids\": [\"11955451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Runx3 functions as a transcriptional repressor of CD4 expression during T cell lineage decisions in the thymus, and is required for CD8+ T cell maturation; compound Runx3-/-;Runx1+/- mice completely lack single-positive CD8+ T cells, indicating that Runx3 and Runx1 cooperate to repress CD4 and drive CD8 lineage commitment.\",\n      \"method\": \"Runx3 knockout mice; compound Runx3/Runx1 mutant mice; flow cytometry of thymic and peripheral T cell subsets; in vitro cytotoxicity assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, genetic epistasis with Runx1, replicated in compound mutant\",\n      \"pmids\": [\"12796513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Runx2 and Runx3 are both essential for chondrocyte maturation during endochondral ossification; Runx2-/-Runx3-/- double-knockout mice show complete absence of chondrocyte maturation and fail to express Indian hedgehog (Ihh). Runx2 directly binds the Ihh promoter and drives Ihh expression, linking Runx proteins to chondrocyte proliferation and maturation through Ihh induction.\",\n      \"method\": \"Runx2/Runx3 double-knockout mice; adenoviral Runx2 introduction in chondrocyte cultures; luciferase reporter assay with Ihh promoter; chromatin immunoprecipitation (promoter binding)\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo double-KO epistasis + in vitro promoter binding + reporter assay, 479 citations\",\n      \"pmids\": [\"15107406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RUNX3 (CBFα3/AML2) is induced by TGF-β1 in B cells and binds two CBF binding sites in the TGF-β-responsive element (TβRE) of the germline Ig α promoter to activate IgA class switch transcription.\",\n      \"method\": \"TGF-β1 treatment of splenic B cells and I.29μ B cell line; EMSA demonstrating TGF-β1-inducible complex binding TβRE; overexpression of CBFα family members with luciferase reporter; promoter mutation analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — EMSA + promoter mutagenesis + reporter assay, establishes direct DNA binding and TGF-β1 inducibility\",\n      \"pmids\": [\"9862705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PTHrP prevents chondrocyte premature hypertrophy by inducing cyclin D1-dependent CDK4-mediated phosphorylation of Runx3 at Ser356, followed by ubiquitylation and proteasomal degradation. CDK4 directly phosphorylates GST-Runx3 in vitro; S356A mutation stabilizes Runx3 and confers resistance to cyclin D1-induced degradation.\",\n      \"method\": \"Pulse-chase experiments in COS/RCJ3.1C5.18 cells; co-immunoprecipitation of Runx3 with CDK4; in vitro CDK4 kinase assay with GST-Runx3; ubiquitylation assays; proteasome inhibitor rescue; Ccnd1-knockout mouse growth plates; primary chondrocyte PTHrP treatment\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay + mutagenesis + in vivo KO validation, multiple orthogonal methods\",\n      \"pmids\": [\"19351720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RUNX3 is a target of MDM2-mediated ubiquitination; RUNX3 directly binds MDM2 through its Runt domain. MDM2 ubiquitinates RUNX3 on key lysine residues, promoting nuclear export and proteasomal degradation, thereby blocking RUNX3 transcriptional activity. This is stabilized when Ras activates the p14ARF-MDM2 pathway.\",\n      \"method\": \"Co-immunoprecipitation of RUNX3 and MDM2; in vitro ubiquitination assay; domain mapping by deletion mutants; siRNA knockdown; proteasomal degradation assays; Ras activation experiments\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding demonstrated by Co-IP, in vitro ubiquitination, domain mapping, multiple methods\",\n      \"pmids\": [\"19808967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TGF-β induces RUNX1 and RUNX3 expression in CD4+ T cells, which then bind three RUNX binding sites in the FOXP3 promoter to drive Foxp3 expression and inducible regulatory T cell (iTreg) differentiation. CBFβ inactivation in mice and siRNA-mediated RUNX1/RUNX3 knockdown in human T cells reduces Foxp3 expression and iTreg suppressive function.\",\n      \"method\": \"TGF-β treatment of CD4+ T cells; siRNA knockdown of RUNX1/RUNX3; Cbfb conditional KO mice with adoptive transfer; ChIP showing RUNX binding at FOXP3 promoter; in vitro Treg suppression assays; immunofluorescence colocalization\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP at FOXP3 promoter + genetic KO + functional suppression assay, multiple orthogonal methods\",\n      \"pmids\": [\"19917773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RUNX3 acts as a co-activator for p53 in DNA damage responses; RUNX3 forms a complex with p53 via the C-terminal portion of p53 (demonstrated by co-IP and GST pulldown), accumulates in the nucleus after DNA damage, promotes phosphorylation of p53 at Ser-15, and interacts with phosphorylated ATM, thereby enhancing p53-dependent transcription and apoptosis.\",\n      \"method\": \"siRNA knockdown of RUNX3; immunoprecipitation of RUNX3-p53 complex; in vitro GST pulldown mapping p53-RUNX3 interaction domains; luciferase reporter assay for p53 transcriptional activity; subcellular fractionation; immunofluorescence colocalization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro pulldown + Co-IP domain mapping + functional reporter assays + siRNA phenotype\",\n      \"pmids\": [\"20353948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RUNX3 functions downstream of BMP signaling in colorectal cancer cells to suppress c-Myc expression via two parallel pathways: direct transcriptional repression of c-Myc and attenuation of β-catenin/TCF transactivation, thereby mediating growth-suppressive effects of BMP.\",\n      \"method\": \"BMP treatment of HT-29 colorectal cancer cells; RUNX3 overexpression and knockdown; luciferase reporter assays for c-Myc promoter and TCF activity; Western blot for c-Myc and β-catenin\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pathway placement by epistasis + reporter assays, single lab\",\n      \"pmids\": [\"20442291\"],\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 the SAV1-RUNX3 interaction. RUNX3 acts as an endpoint effector of MST, and siRNA knockdown of RUNX3 abolishes MST/Hpo-mediated cell death.\",\n      \"method\": \"Co-immunoprecipitation of RUNX3 with MST2 and SAV1; siRNA knockdown of RUNX3 with MST-induced apoptosis readout\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP interaction + functional siRNA readout, single lab\",\n      \"pmids\": [\"21678419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Runx3 is a key transcription factor required for tissue-resident memory CD8+ T (TRM) cell differentiation and homeostasis; Runx3 establishes TRM cell populations across diverse tissue environments by supporting tissue-residency genes and suppressing tissue-egress genes. Runx3 overexpression in adoptively transferred CD8+ T cells enhanced tumor-specific T cell accumulation and delayed tumor growth.\",\n      \"method\": \"Pooled in vivo RNAi screen; Runx3 conditional KO mice; chromatin accessibility and gene expression profiling of TRM precursors; adoptive T cell transfer in melanoma mouse model; overexpression of Runx3 in CD8+ T cells\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo RNAi screen + genetic KO + gain-of-function in vivo, 548 citations, multiple orthogonal approaches\",\n      \"pmids\": [\"29211713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Runx3 regulates interleukin-15-dependent natural killer (NK) cell activation; loss of Runx3 impairs IL-15-dependent accumulation of mature NK cells. ChIP-seq combined with differential gene expression showed Runx3 cooperates with ETS and T-box transcription factors to drive the IL-15-mediated transcription program regulating NK cell proliferation, maturation, and migration.\",\n      \"method\": \"Runx3-/- mice; in vivo NK cell quantification; ChIP-seq of Runx3 binding in activated NK cells; differential gene expression analysis of WT vs Runx3-deficient NK cells; uterine NK cell analysis in pregnant Runx3-/- mice\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO phenotype + genome-wide ChIP-seq + transcriptomics, multiple orthogonal methods\",\n      \"pmids\": [\"24421391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Runx3 regulates development of skin dendritic epidermal T cells (DETCs) by controlling expression of CD103 (αEβ7 integrin) and IL-2Rβ; absence of Runx3 reduces CD103 and IL-2Rβ on DETC precursors, impairing proliferation and maturation, leading to complete loss of skin DETCs.\",\n      \"method\": \"Runx3-/- mice; flow cytometry and histology of skin DETCs; gene expression analysis of CD103 and IL-2Rβ\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype and target gene identification, single lab\",\n      \"pmids\": [\"17222403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nr4a1 (nuclear receptor) directly suppresses Runx3 expression in CD8+ T cells by recruiting the corepressor CoREST to the Runx3 locus; loss of Nr4a1 increases Runx3 expression in thymocytes, resulting in a 2-fold increase in CD8+ T cell frequency.\",\n      \"method\": \"Nr4a1 knockout mice; ChIP showing Nr4a1 and CoREST binding at Runx3 locus; flow cytometry of CD8+ T cell subsets in thymus and periphery\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP of transcriptional repressor at Runx3 locus + KO phenotype, single lab\",\n      \"pmids\": [\"25762306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"During the restriction point (R-point), Runx3 transiently forms a complex with pRb and Brd2 and induces expression of p21 (Cdkn1a), a key R-point regulator. Cyclin D-CDK4/6 promotes dissociation of the pRb-Runx3-Brd2 complex to turn off p21 expression. Runx3-/- MEFs have dysregulated R-point and form tumors in nude mice; ectopic Runx3 restores R-point control.\",\n      \"method\": \"Runx3-/- mouse embryonic fibroblasts; Co-immunoprecipitation of Runx3-pRb-Brd2 complex; ectopic expression of Runx3 restoring R-point; nude mouse tumorigenicity; Cyclin D1 treatment dissociating complex; K-Ras activation experiments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP of trimeric complex + in vivo tumor rescue + mechanistic dissection with cyclin D1, multiple methods\",\n      \"pmids\": [\"28846108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TGFβ promotes DNA double-strand breaks (genomic instability) in RUNX3-deficient cancer cells by downregulating the redox regulator heme oxygenase-1 (HO-1/HMOX1), which is a transcriptional target of RUNX3; loss of RUNX3 reduces HO-1, elevates oxidative DNA damage, triggers cellular senescence and SASP.\",\n      \"method\": \"RUNX3 KO/knockdown in cancer cells; TGFβ treatment; measurement of DSBs and oxidative damage; transcriptional analysis of HO-1; SASP assay; tumor genomic instability analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined molecular mechanism (HO-1 transcriptional target) + multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"29074538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"G9a (lysine methyltransferase KMT2C) methylates RUNX3 at K129 and K171 under hypoxia; G9a interacts with the RUNX3 Runt domain. This methylation inactivates RUNX3 transcriptional activity by reducing interactions with CBFβ and p300 cofactors, reducing p300-mediated RUNX3 acetylation, and impairing nuclear import via importin-α1, thereby promoting cancer cell proliferation and suppressing apoptosis.\",\n      \"method\": \"Co-immunoprecipitation of G9a-RUNX3; in vitro methylation assay; mass spectrometry identification of methylation sites K129/K171; domain mapping; interaction assays with CBFβ and p300; importin-α1 interaction; cell proliferation and apoptosis assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro methylation assay + mass spec site identification + multiple interaction partner studies, mechanistically comprehensive\",\n      \"pmids\": [\"33116296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Runx3 interacts with DNA repair protein Ku70; the interaction was identified by proteomic pulldown and confirmed by His-tag in vitro pulldown. The interaction domain maps to amino acids 241-322 of Runx3 (transcriptional activation domain) and amino acids 1-116 of Ku70. Ku70 knockdown increases Runx3-driven p21 transcription, suggesting Ku70 modulates Runx3 transcriptional activity.\",\n      \"method\": \"Affinity purification of MEF-tagged Runx3 complex + mass spectrometry; His-tag in vitro pulldown; co-immunoprecipitation in vivo; domain deletion mapping; siRNA knockdown of Ku70 with p21 reporter; confocal immunocytochemistry\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro pulldown + Co-IP + domain mapping + functional consequence of KD, single lab\",\n      \"pmids\": [\"17662272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Runx3 directly binds the Osterix (Sp7) promoter at a RUNX binding site (-713 to -707 bp) and transcriptionally represses Osterix expression in dental pulp cells; mutation of this site abolishes repression. Confirmed by EMSA and ChIP in mouse dental pulp cells.\",\n      \"method\": \"Luciferase reporter assay with Osterix promoter in HEK293T cells; promoter site-directed mutagenesis; EMSA; ChIP in mouse dental pulp cells\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct promoter binding by EMSA + ChIP + mutagenesis, multiple orthogonal methods\",\n      \"pmids\": [\"17352693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RUNX3 negatively regulates CD36 expression in myeloid cells; RUNX3 binds two functional RUNX-binding elements in the CD36 gene proximal regulatory region in vitro and in vivo (ChIP), and overexpression of RUNX3 drastically reduces CD36 expression.\",\n      \"method\": \"EMSA identifying RUNX binding sites in CD36 promoter; ChIP showing RUNX3 occupancy at CD36 regulatory region; RUNX3 overexpression in myeloid cells with CD36 protein measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — EMSA + ChIP + overexpression functional readout, single lab\",\n      \"pmids\": [\"16887969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RUNX3 negatively regulates ICAM-3 gene expression in myeloid cells during macrophage differentiation and monocyte extravasation; RUNX3 occupies RUNX cognate sequences in the ICAM-3 promoter in vivo, and disruption of RUNX-binding sites or siRNA-mediated reduction of RUNX3 results in increased ICAM-3 mRNA levels.\",\n      \"method\": \"ICAM-3 promoter luciferase assay; ChIP showing RUNX occupancy; siRNA knockdown of RUNX3 with ICAM-3 mRNA quantification; RUNX binding site mutagenesis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + promoter mutagenesis + siRNA functional assay, single lab\",\n      \"pmids\": [\"22479382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RUNX3 suppresses gastric cancer cell invasion and vimentin expression by transcriptionally activating miR-30a, which directly targets the 3' UTR of vimentin; miR-30a inhibitor abrogates RUNX3-mediated suppression of invasion and vimentin downregulation.\",\n      \"method\": \"RUNX3 overexpression and knockdown; invasion assays; Western blot for vimentin; miR-30a quantification; 3'UTR luciferase reporter for vimentin-miR-30a targeting; miR-30a inhibitor rescue experiments; nude mouse colonization assay\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — 3'UTR reporter + inhibitor rescue + in vivo assay, single lab, moderate evidence\",\n      \"pmids\": [\"24447545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RUNX3 directly binds the promoter region of miR-182 (confirmed by ChIP) and transcriptionally suppresses it; miR-182 directly targets HOXA9. Thus, RUNX3 inhibits gastric cancer cell proliferation and metastasis via the miR-182/HOXA9 axis.\",\n      \"method\": \"ChIP showing RUNX3 binding to miR-182 promoter; luciferase reporter for HOXA9 as miR-182 target; overexpression/knockdown of RUNX3; rescue experiments with miR-182 mimics; in vivo xenograft mouse model\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP at miR-182 promoter + luciferase validation of HOXA9 target + in vivo, single lab\",\n      \"pmids\": [\"29054094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss of osteoblast-specific Runx3 causes severe congenital osteopenia; Runx3 is expressed in precommitted embryonic osteoblasts and is required for osteoblast proliferation (not apoptosis) to generate adequate numbers of active osteoblasts. Osteoblast-specific Runx3 (Col1α1-cre) but not chondrocyte-specific (Col1α2-cre) KO mice are osteopenic.\",\n      \"method\": \"Conditional Runx3 KO mice with Col1α1-Cre and Col1α2-Cre drivers; bone histomorphometry; primary osteoblast culture proliferation assays; transcriptome analysis of Runx3-null bone\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with cell-type specificity + histomorphometry + transcriptomics, cell-autonomous osteoblastic function established\",\n      \"pmids\": [\"25605327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RUNX3 directly interacts with GLI1 and promotes its ubiquitination by E3 ligase β-TrCP, thereby inhibiting Hedgehog signaling and suppressing cancer stem cell properties and metastasis in colorectal cancer.\",\n      \"method\": \"Co-immunoprecipitation of RUNX3-GLI1; ubiquitination assay; β-TrCP identification as the E3 ligase; inverse correlation of RUNX3 and GLI1 in CRC tissues; functional assays for stemness and metastasis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP + ubiquitination assay + E3 ligase identification, single lab\",\n      \"pmids\": [\"31278361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RUNX3 regulates expression of CD11a (LFA-1) and CD49d (VLA-4) integrin gene promoters; RUNX3 overexpression leads to enhanced CD11a/CD18 levels, and RUNX3 transactivates the CD49d gene promoter through RUNX-binding elements.\",\n      \"method\": \"Luciferase reporter assays for CD11a and CD49d promoters; RUNX3 overexpression; correlation of RUNX3 mRNA with CD49d during dendritic cell maturation\",\n      \"journal\": \"Immunobiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — reporter assays and expression correlation, no ChIP confirmation of binding\",\n      \"pmids\": [\"16164020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Runx1 and Runx3 are coexpressed in single pro-T cells, bind highly overlapping genomic sites, and have redundant collaborative functions in T cell lineage commitment; they preferentially activate T-lineage genes and repress multipotent progenitor genes at stage-specific loci, shifting binding sites extensively during commitment.\",\n      \"method\": \"Single and double Runx1/Runx3 CRISPR/Cas9 knockouts in pro-T cells; ChIP-seq mapping of Runx1 and Runx3 binding sites across stages; gene expression profiling; partner factor cobinding analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — CRISPR double KO + genome-wide ChIP-seq + transcriptomics, mechanistically comprehensive\",\n      \"pmids\": [\"33479171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Runx3 protects adult articular chondrocytes by transcriptionally driving lubricin and aggrecan expression; Runx3-knockout mice show accelerated osteoarthritis with decreased lubricin and aggrecan. Intra-articular administration of Runx3 adenovirus ameliorated surgically induced osteoarthritis.\",\n      \"method\": \"Runx3-KO mice with surgical OA induction; Runx2 conditional KO mice; comprehensive transcriptional analysis identifying lubricin and aggrecan as Runx3 target genes; intra-articular adenoviral Runx3 delivery\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO phenotype + target gene identification by transcriptomics + therapeutic gain-of-function, multiple approaches\",\n      \"pmids\": [\"36261443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RUNX3 overexpression in MDS suppresses RUNX1 and its target genes (Cebpa, Csf1r) by binding and remodeling their Runx1-binding regions in Tet2-deficient cells; RUNX3 also activates Myc target genes. In a Tet2-deficient mouse model, RUNX3 overexpression drives MDS-like disease.\",\n      \"method\": \"RUNX3-expressing Tet2-deficient mouse model; ChIP-seq of RUNX3 at Runx1 target gene loci; gene expression analysis; pharmacological MYC-MAX inhibition showing sensitivity\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse model + ChIP-seq mechanistic dissection + pharmacological validation, multiple methods\",\n      \"pmids\": [\"32341038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MYC transcriptionally drives RUNX3 expression in NK/T-cell lymphoma (NKTL) by binding to the RUNX3 enhancer region; ChIP-qPCR confirmed MYC binding to the RUNX3 enhancer, and co-transfection of MYC with RUNX3 enhancer reporter activated transcription. In NKTL, RUNX3 has oncogenic function promoting proliferation and survival.\",\n      \"method\": \"ChIP-qPCR showing MYC binding at RUNX3 enhancer; luciferase reporter assay with RUNX3 enhancer + MYC co-transfection; MYC inhibitor (JQ1) treatment; RUNX3 silencing with apoptosis/proliferation readout\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP showing direct upstream regulation + functional reporter + pharmacological validation, single lab\",\n      \"pmids\": [\"28119527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Endothelial RUNX3 maintains liver sinusoidal endothelial cell (LSEC) function; endothelial Runx3-deficient mice develop spontaneous liver fibrosis via IL-6/JAK/STAT3 pathway activation. RUNX3-deficient LSECs secrete LRG1, which activates hepatic stellate cells through TGFBR1-SMAD2/3 signaling in a paracrine manner.\",\n      \"method\": \"Endothelial-specific Runx3 KO mice (spontaneous fibrosis phenotype); single-cell RNA sequencing of liver; in vitro LSEC mechanistic studies; co-culture experiments with LRG1 and HSCs; TGFBR1-SMAD2/3 signaling assays; clinical LRG1 measurement in patients\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO in vivo + scRNA-seq + co-culture mechanistic dissection + pathway identification, multiple orthogonal methods\",\n      \"pmids\": [\"39042837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Thrombospondin-1 (TSP-1) is a transcriptional target of Runx3; Runx3 expression strongly induces TSP-1 at both mRNA and protein levels in B16-F10 melanoma cells, and Runx3 binds the TSP-1 promoter and stimulates reporter activity.\",\n      \"method\": \"PCR-based cDNA subtraction identifying TSP-1 upregulation by Runx2/Runx3; TSP-1 promoter luciferase reporter assay; Western blot and RT-PCR for TSP-1 upon Runx3 expression in melanoma cells\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — reporter assay + overexpression, no ChIP confirmation of direct binding, single lab\",\n      \"pmids\": [\"23846726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RUNX3 induces ferroptosis in gallbladder cancer by activating ING1 transcription (confirmed by ChIP and dual-luciferase assay), which then represses SLC7A11 in a p53-dependent manner; DNMT1-mediated methylation of the RUNX3 promoter silences this pathway.\",\n      \"method\": \"Bisulfite sequencing PCR; dual-luciferase reporter assay; ChIP assay for RUNX3 at ING1 promoter; gain- and loss-of-function assays; in vitro and in vivo ferroptosis assays\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + luciferase reporter + in vivo functional assay, single lab, moderate evidence\",\n      \"pmids\": [\"37156453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Runx3-expressing vagal sensory neuron subtypes (co-expressing Prox2 and Runx3) innervate the esophagus as intraganglionic laminar endings and are low-threshold mechanoreceptors; genetic ablation of Prox2/Runx3 neurons abolishes esophageal peristalsis in freely behaving mice.\",\n      \"method\": \"Genetically guided anatomical tracing; optogenetics; electrophysiology; genetic ablation of Prox2/Runx3-expressing neurons with esophageal motility readout\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic ablation with defined motor phenotype + electrophysiology + optogenetics, multiple orthogonal approaches\",\n      \"pmids\": [\"37192624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Runx3 controls muscle-specific aspects of sensorimotor circuit formation; conditional inactivation of Runx3 in proprioceptive sensory neurons (PSNs) after peripheral innervation reveals that Runx3 maintains PSN subgroup cell identity and controls sensorimotor connections with muscle-by-muscle variable sensitivity. Target muscles and neurotrophin-3 signaling are required to maintain Runx3 expression in PSNs.\",\n      \"method\": \"Conditional Runx3 inactivation in PSNs after peripheral innervation; anatomical tracing of sensorimotor connections; NT-3 signaling perturbation; in situ hybridization and immunohistochemistry\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined circuit phenotype + upstream signal identification, single lab\",\n      \"pmids\": [\"31575648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RUNX3 reinstates TGF-β responsiveness in Barrett's-derived esophageal adenocarcinoma cells (SEG-1) that lack RUNX3; transfection of RUNX3 restores Smad-mediated TGF-β transcriptional activity and enables TGF-β-induced antiproliferation and apoptosis.\",\n      \"method\": \"RUNX3 transfection into SEG-1 cells; dual-luciferase assay for Smad-mediated TGF-β transcription; proliferation and apoptosis assays with TGF-β treatment\",\n      \"journal\": \"Surgery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function + reporter assay demonstrating pathway restoration, single lab\",\n      \"pmids\": [\"15300196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RUNX1 and RUNX3 interact with YAP (Hippo pathway effector) and act as negative regulators of its oncogenic function; RUNX1/RUNX3 inhibit YAP-mediated migration and stemness in mammary epithelial cells in an interaction-dependent manner and co-regulate YAP-mediated gene expression.\",\n      \"method\": \"Co-immunoprecipitation of RUNX1/RUNX3 with YAP; RUNX1/RUNX3 overexpression with YAP; migration and stemness assays in mammary epithelial cell lines; gene expression profiling\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP establishing interaction + functional assays, single lab\",\n      \"pmids\": [\"29581836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"miR-130b directly targets and downregulates RUNX3 protein in gastric cancer cells, reducing TGF-β-mediated apoptosis (via Bim) and increasing cell viability; demonstrated by luciferase reporter assay and Western blot.\",\n      \"method\": \"Bioinformatic prediction + luciferase reporter assay for miR-130b targeting RUNX3 3'UTR; miR-130b precursor/inhibitor transfection; cell viability, apoptosis, and Bim expression assays\",\n      \"journal\": \"European journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — 3'UTR reporter + functional phenotype, single lab\",\n      \"pmids\": [\"20176475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Runx3 is expressed in early and late chondrocyte differentiation and transcriptionally inhibits Runx1 expression in chondrocytes; Runx3 gain and loss of function regulates both early and late markers of chondrocyte maturation.\",\n      \"method\": \"Real-time RT-PCR of Runx3 in embryonic development; Runx3 overexpression and siRNA knockdown in chondrogenic cell lines; luciferase reporter assay of Runx1 promoter driven by Runx3\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain/loss of function with defined target gene (Runx1) + reporter assay, single lab\",\n      \"pmids\": [\"17488194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RUNX3 protein is frequently mislocalized to the cytoplasm in breast cancer (35/44 primary tumors), which is a distinct mechanism of inactivation separate from promoter hypermethylation; cytoplasmic RUNX3 cannot perform its growth-suppressive function. Stable nuclear RUNX3 expression in MDA-MB-231 cells reduced invasiveness and tumor formation.\",\n      \"method\": \"IHC and subcellular fractionation of RUNX3 in primary breast cancer specimens; stable RUNX3 expression in MDA-MB-231 cells; Matrigel invasion assay; nude mouse tumor formation assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — localization tied to functional consequence (invasion, tumorigenicity), single lab\",\n      \"pmids\": [\"16818622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Runx3 regulates folliculogenesis and steroidogenesis in ovarian granulosa cells; Runx3-/- mice have reduced primary and antral follicles, decreased expression of activin/inhibin subunits (Inha, Inhba, Inhbb), and decreased steroidogenic enzyme genes Cyp11a1 and Cyp19a1. Cultured Runx3-/- granulosa cells show impaired FSH-induced Cyp19a1 induction.\",\n      \"method\": \"Runx3 knockout mice (ovarian histology and follicle counting); gene expression analysis by qPCR in ovaries; primary granulosa cell culture with FSH treatment\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined cellular and molecular phenotype, primary cell culture validation, single lab\",\n      \"pmids\": [\"30377784\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RUNX3 is a Runt-domain transcription factor that functions downstream of TGF-β/BMP/Hippo signaling to regulate cell proliferation, apoptosis, and lineage specification: it directly binds target gene promoters (Ihh, Foxp3, Osterix, miR-182, ING1, ICAM-3, CD36, TSP-1) via its Runt domain, forms functional complexes with co-regulators (CBFβ, p53, pRb-Brd2, MST2-SAV1, YAP), and is post-translationally regulated by CDK4-mediated phosphorylation at Ser356 (leading to ubiquitylation and proteasomal degradation), G9a-mediated lysine methylation at K129/K171 (impairing nuclear import and cofactor interactions), and MDM2-mediated ubiquitination (promoting nuclear export), while its nuclear localization is essential for tumor suppressor activity; in immune cells, RUNX3 is a master regulator of CD8+ T cell and tissue-resident memory T cell differentiation, NK cell activation, and iTreg function, and in cancer contexts can function as either a tumor suppressor (gastric, colorectal, lung, bladder) or an oncogene (NKTL, HNSCC, MDS), depending on cellular context and co-regulatory partners.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RUNX3 is a Runt-domain transcription factor that functions as a context-dependent regulator of cell proliferation, apoptosis, and lineage specification across epithelial, immune, skeletal, and neuronal tissues. It acts downstream of TGF-β and BMP signaling to mediate growth inhibition and apoptosis in gastric and colorectal epithelial cells—where it directly represses c-Myc and activates p21—and cooperates with p53 in the DNA damage response by promoting p53 Ser-15 phosphorylation and forming a transient pRb–Brd2 complex at the restriction point [PMID:11955451, PMID:20353948, PMID:28846108, PMID:20442291]. In the immune system, RUNX3 is essential for CD8+ T cell maturation, tissue-resident memory T cell differentiation, NK cell activation, and iTreg function through direct transcriptional control of CD4 silencing, FOXP3, and IL-15-dependent gene programs [PMID:12796513, PMID:29211713, PMID:19917773, PMID:24421391]. RUNX3 is post-translationally regulated by CDK4-mediated phosphorylation at Ser356 triggering proteasomal degradation, MDM2-mediated ubiquitination promoting nuclear export, and G9a-mediated methylation at K129/K171 impairing CBFβ/p300 interactions and nuclear import; cytoplasmic mislocalization constitutes a major inactivation mechanism in cancer [PMID:19351720, PMID:19808967, PMID:33116296, PMID:16818622].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that RUNX3 is a TGF-β-inducible transcription factor that directly binds DNA to activate gene expression resolved its initial molecular identity as a signal-responsive transcriptional activator.\",\n      \"evidence\": \"TGF-β1 treatment of B cells with EMSA and luciferase reporter assays on the germline Igα promoter\",\n      \"pmids\": [\"9862705\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No genome-wide binding data at this stage\", \"Mechanism of TGF-β-mediated RUNX3 induction not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating that Runx3 loss causes gastric epithelial hyperplasia through loss of TGF-β-mediated growth inhibition and apoptosis established RUNX3 as a bona fide tumor suppressor and linked its Runt domain to this function.\",\n      \"evidence\": \"Runx3 knockout mouse with gastric hyperplasia; TGF-β resistance in primary cells; R122C Runt domain mutation abolishing suppression; tumorigenicity assays\",\n      \"pmids\": [\"11955451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets mediating tumor suppression not identified\", \"Whether tumor-suppressive function extends beyond gastric epithelium unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showing that Runx3 represses CD4 and is required for CD8+ T cell maturation—with Runx1 acting redundantly—revealed RUNX3's central role in T cell lineage decisions.\",\n      \"evidence\": \"Runx3 KO and compound Runx3/Runx1 mutant mice with flow cytometry of thymic subsets\",\n      \"pmids\": [\"12796513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct CD4 silencer binding by Runx3 not shown at this stage\", \"Downstream gene program not characterized genome-wide\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The discovery that Runx2/Runx3 double knockout abolishes chondrocyte maturation and Ihh expression established functional redundancy among Runx family members in skeletal development and identified Ihh as a direct transcriptional target.\",\n      \"evidence\": \"Runx2/Runx3 double-KO mice; ChIP and reporter assays on the Ihh promoter\",\n      \"pmids\": [\"15107406\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of Runx2 vs Runx3 to individual target genes not delineated\", \"Post-translational regulation in chondrocytes unexplored\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying cytoplasmic mislocalization of RUNX3 in breast cancer as a distinct inactivation mechanism, and showing that nuclear RUNX3 directly regulates CD36 and ICAM-3 in myeloid cells, broadened understanding of both its tumor suppressor inactivation and immune-cell transcriptional programs.\",\n      \"evidence\": \"IHC/subcellular fractionation in breast tumors with invasion/tumorigenicity assays; EMSA and ChIP at CD36 and ICAM-3 promoters with overexpression/knockdown\",\n      \"pmids\": [\"16818622\", \"16887969\", \"17222403\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism driving cytoplasmic mislocalization not identified\", \"No ChIP confirmation for integrin targets CD11a/CD49d\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapping Runx3 interaction with Ku70 and demonstrating direct repression of the Osterix promoter expanded the catalog of RUNX3 partners and transcriptional targets in skeletal and DNA repair contexts.\",\n      \"evidence\": \"Affinity purification/mass spectrometry identifying Ku70; in vitro pulldown and Co-IP mapping domains; ChIP and EMSA at the Osterix promoter; Runx3 gain/loss of function in chondrocytes\",\n      \"pmids\": [\"17662272\", \"17352693\", \"17488194\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional significance of Ku70 interaction in DNA repair not tested in vivo\", \"Whether Osterix repression is physiologically relevant in osteoblasts vs dental cells unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Elucidating two post-translational degradation pathways—CDK4 phosphorylation at Ser356 and MDM2-mediated ubiquitination—revealed how RUNX3 protein levels are dynamically controlled in proliferating and oncogene-activated cells, and RUNX3's direct binding to the FOXP3 promoter established its role in iTreg differentiation.\",\n      \"evidence\": \"In vitro CDK4 kinase assay with S356A mutagenesis and Ccnd1-KO mice; Co-IP/ubiquitination assays for MDM2-RUNX3; ChIP at FOXP3 promoter with Cbfb conditional KO and Treg suppression assays\",\n      \"pmids\": [\"19351720\", \"19808967\", \"19917773\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the E3 ligase for CDK4-dependent ubiquitylation unknown\", \"Whether MDM2-mediated export occurs in non-cancer contexts untested\", \"Relative importance of RUNX3 vs RUNX1 at the FOXP3 promoter unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrating that RUNX3 cooperates with p53 in the DNA damage response and suppresses c-Myc downstream of BMP signaling established RUNX3 as an integrator of multiple tumor-suppressive signaling pathways.\",\n      \"evidence\": \"Co-IP and GST pulldown of RUNX3-p53; p53 transcriptional reporters and ATM interaction; BMP treatment with c-Myc and TCF reporter assays in colorectal cancer cells\",\n      \"pmids\": [\"20353948\", \"20442291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of p53–RUNX3 interaction unknown\", \"Direct BMP-responsive element in RUNX3 gene not mapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placing RUNX3 downstream of the MST/Hippo pathway as an effector mediating MST-induced apoptosis linked RUNX3 to a fourth major growth-control signaling axis.\",\n      \"evidence\": \"Co-immunoprecipitation of RUNX3 with MST2 and SAV1; siRNA knockdown ablating MST-mediated cell death\",\n      \"pmids\": [\"21678419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct phosphorylation or other post-translational modification by MST on RUNX3 demonstrated\", \"Single lab; not independently replicated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Conditional knockout studies established a cell-autonomous role for Runx3 in osteoblast proliferation and bone mass maintenance, distinct from its chondrocyte functions.\",\n      \"evidence\": \"Osteoblast-specific (Col1α1-Cre) vs chondrocyte-specific (Col1α2-Cre) Runx3 KO mice with bone histomorphometry and primary osteoblast culture\",\n      \"pmids\": [\"25605327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct osteoblast target genes not identified by ChIP\", \"Relationship to Runx2 in this lineage not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Multiple 2017 studies consolidated RUNX3's role at the restriction point via a pRb–Brd2 complex, in tissue-resident memory CD8+ T cell differentiation, and as an MYC-driven oncogene in NK/T-cell lymphoma, revealing its fundamentally context-dependent function.\",\n      \"evidence\": \"Co-IP of pRb-Runx3-Brd2 with cyclin D dissociation and Runx3-null MEF tumorigenesis; in vivo RNAi screen and conditional KO for TRM cells; ChIP-qPCR of MYC at RUNX3 enhancer in NKTL\",\n      \"pmids\": [\"28846108\", \"29211713\", \"28119527\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural determinants of pRb–Brd2–RUNX3 complex formation unknown\", \"Whether RUNX3 overexpression in NKTL bypasses normal post-translational controls not tested\", \"Chromatin remodeling targets in TRM program not fully delineated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identifying G9a-mediated methylation at K129/K171 as a mechanism that inactivates RUNX3 by disrupting CBFβ/p300 interactions and nuclear import revealed a hypoxia-responsive epigenetic layer of RUNX3 regulation, while RUNX3 overexpression in Tet2-deficient MDS showed it can suppress RUNX1 targets and activate MYC programs.\",\n      \"evidence\": \"In vitro methylation assay with mass spectrometry; interaction assays with CBFβ, p300, importin-α1; ChIP-seq of RUNX3 in Tet2-deficient mouse MDS model\",\n      \"pmids\": [\"33116296\", \"32341038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether G9a methylation occurs in non-cancer contexts not established\", \"Whether demethylases reverse RUNX3 methylation unknown\", \"Mechanism of RUNX3 overexpression in human MDS not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Genome-wide ChIP-seq in pro-T cells demonstrated that Runx1 and Runx3 bind highly overlapping sites and have redundant functions in T-lineage commitment, resolving the question of why single knockouts show incomplete phenotypes.\",\n      \"evidence\": \"CRISPR single and double Runx1/Runx3 KO in pro-T cells with ChIP-seq and transcriptomics\",\n      \"pmids\": [\"33479171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How stage-specific binding site shifts are encoded at the chromatin level remains unclear\", \"Cofactor requirements for Runx binding specificity at individual loci not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that Runx3 maintains articular cartilage by driving lubricin and aggrecan expression, and that adenoviral Runx3 delivery ameliorates osteoarthritis, established a protective role distinct from developmental chondrocyte maturation.\",\n      \"evidence\": \"Runx3-KO mice with surgical OA; transcriptomics identifying lubricin/aggrecan as targets; intra-articular adenoviral Runx3 rescue\",\n      \"pmids\": [\"36261443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct promoter binding of Runx3 at lubricin and aggrecan loci not confirmed by ChIP\", \"Long-term safety and efficacy of adenoviral Runx3 not assessed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Endothelial-specific Runx3 deletion causing spontaneous liver fibrosis via LRG1-TGFBR1-SMAD2/3 paracrine signaling revealed a previously unrecognized non-epithelial, non-immune role for RUNX3 in vascular homeostasis.\",\n      \"evidence\": \"Endothelial-specific Runx3 KO mice; scRNA-seq; LSEC-hepatic stellate cell co-culture; LRG1-TGFBR1-SMAD2/3 pathway analysis\",\n      \"pmids\": [\"39042837\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RUNX3 directly represses LRG1 transcription not shown\", \"Relevance to human liver fibrosis beyond LRG1 serum correlation not demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis for RUNX3's interaction with its diverse partners (p53, pRb-Brd2, YAP, MDM2); the mechanisms selecting RUNX3 as tumor suppressor versus oncogene in different cellular contexts; and whether pharmacological reactivation of silenced RUNX3 (by demethylation or blocking G9a/MDM2) has therapeutic potential.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal structure of RUNX3 with any partner complex available\", \"Context-dependent switch between tumor suppressor and oncogene roles mechanistically undefined\", \"No therapeutic modulation of RUNX3 activity tested in clinical settings\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 3, 6, 18, 19, 20, 22, 26]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 3, 6, 8, 14, 18, 19, 22, 27, 28, 32]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 7, 9, 24, 36]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 7, 16, 39]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 39]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 3, 6, 8, 18, 19, 22, 27, 28, 32]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 8, 9, 35, 36]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 14]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 6, 10, 11, 12, 26]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 23, 34]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 7, 32]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [28, 29, 39]}\n    ],\n    \"complexes\": [\n      \"RUNX3-CBFβ\",\n      \"pRb-RUNX3-Brd2\"\n    ],\n    \"partners\": [\n      \"CBFB\",\n      \"TP53\",\n      \"RB1\",\n      \"BRD2\",\n      \"MDM2\",\n      \"YAP1\",\n      \"EHMT2\",\n      \"XRCC6\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}