{"gene":"RUNX1T1","run_date":"2026-06-10T07:46:28","timeline":{"discoveries":[{"year":1993,"finding":"The t(8;21) translocation juxtaposes AML1 (chromosome 21) with the novel gene MTG8 (chromosome 8), producing an AML1-MTG8 fusion transcript. The predicted fusion protein contains the runt homology region of AML1 and most of MTG8, which contains putative zinc finger DNA binding motifs and proline-rich regions.","method":"RT-PCR, cDNA cloning, Northern blot analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — foundational molecular cloning study establishing the fusion gene structure, replicated immediately in same year by independent group","pmids":["8334990"],"is_preprint":false},{"year":1993,"finding":"AML1/MTG8(ETO) fusion junctions are constant in t(8;21) AML; MTG8 (ETO) transcripts (7.8 kb and 6.2 kb) are detected in t(8;21) cell lines but not in non-t(8;21) lines, confirming the fusion is a consistent feature of this translocation.","method":"RT-PCR, Northern blot analysis, cDNA cloning","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Strong — replicated molecular characterization confirmed across multiple patients and cell lines","pmids":["8353289"],"is_preprint":false},{"year":1996,"finding":"ETO protein is a nuclear phosphoprotein (phosphorylated on serine and threonine) and is associated with the nuclear matrix. ETO is coexpressed with AML1 in megakaryocytes and is unexpectedly present in normal CD34+ hematopoietic progenitor cells.","method":"Immunoprecipitation of 32P-labeled proteins, immunofluorescence, subcellular fractionation, Western blot","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical fractionation and immunoprecipitation in multiple cell types, single lab","pmids":["8781439"],"is_preprint":false},{"year":1997,"finding":"Knock-in of AML1-ETO into the mouse AML1 locus causes embryonic lethality with hemorrhaging in the CNS and a severe block in fetal liver hematopoiesis, phenocopying homozygous loss of AML1 or CBFbeta, indicating AML1-ETO blocks normal AML1 function in vivo.","method":"Gene targeting (knock-in mouse model), hematopoietic colony forming unit assays","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — definitive in vivo genetic epistasis experiment showing dominant-negative function, replicated by other labs","pmids":["9054947"],"is_preprint":false},{"year":1998,"finding":"AML1-MTG8 fusion protein specifically and strongly interacts with MTGR1 (an MTG8 family member) through a 51-residue region (aa 488–538) containing NHR2. This interaction is required for AML1-MTG8 to stimulate G-CSF-dependent proliferation of myeloid progenitor cells and to interfere with AML1-dependent transcription.","method":"Co-immunoprecipitation, C-terminal deletion mutant analysis, ectopic expression in L-G myeloid progenitor cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus mutant functional analysis in cellular model, multiple orthogonal methods","pmids":["9447981"],"is_preprint":false},{"year":1998,"finding":"AML1/ETO(MTG8) accumulates CBFbeta (PEBP2beta) in the nucleus more efficiently than wild-type AML1, and associates with CBFbeta more effectively than wild-type AML1, dependent on the runt domain of the fusion protein.","method":"Immunofluorescence labeling, subcellular fractionation, co-immunoprecipitation in COS-7 cells","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization and binding experiments, single lab, two orthogonal methods","pmids":["9473235"],"is_preprint":false},{"year":1998,"finding":"ETO (MTG8) and AML1/ETO are associated with the nuclear matrix. A 40 amino acid region of ETO (aa 241–280), specifically lysine 265 and/or arginine 266, is sufficient for nuclear import via an importin-alpha/beta mediated pathway. ETO and AML1/ETO co-localize to punctate nuclear bodies distinct from PML bodies.","method":"GFP fusion fluorescence microscopy in living cells, mutational analysis, in vitro importin binding assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live cell imaging plus in vitro binding assay and mutagenesis, single lab","pmids":["10951564"],"is_preprint":false},{"year":2000,"finding":"Atrophin-1 (DRPLA protein) interacts with ETO/MTG8 in the nuclear matrix. When co-transfected, atrophin-1 is recruited to nuclear structures containing mSin3A and histone deacetylases, and atrophin-1 represses transcription, suggesting ETO/MTG8 links atrophin-1 to nuclear receptor corepressor complexes.","method":"Yeast two-hybrid, co-transfection/co-localization in Neuro-2a cells, nuclear matrix fractionation from transgenic mouse brain, transcriptional repression assay","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus co-localization and fractionation, single lab, multiple methods","pmids":["10973986"],"is_preprint":false},{"year":2001,"finding":"ETO oligomerization mediated by NHR2 is required for interaction with corepressors SMRT and N-CoR. NHR2 mediates oligomerization of both ETO and AML1-ETO; polypeptides containing only NHR4 are insufficient for SMRT interaction, but fusion of NHR4 to a heterologous dimerization domain restores SMRT binding in vitro. NHR2 is also required for ETO repression function and inhibition of hematopoietic differentiation by AML1-ETO.","method":"Co-immunoprecipitation, in vitro binding assay, reporter gene repression assay, hematopoietic differentiation assay, deletion and fusion mutants","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in vitro plus mutagenesis plus functional cellular assays, multiple orthogonal methods","pmids":["11113190"],"is_preprint":false},{"year":2001,"finding":"MTG8 interacts with the regulatory subunit of type II cAMP-dependent protein kinase (PKA RIIalpha) via its NHR3 domain (which contains a putative alpha-amphipathic helix characteristic of AKAPs). MTG8 and RIIalpha co-localize at the centrosome-Golgi area in lymphocytes.","method":"Co-immunoprecipitation, indirect immunofluorescence microscopy, domain mapping","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus co-localization with domain mapping, single lab","pmids":["11593431"],"is_preprint":false},{"year":2001,"finding":"MTG8 knockout mice show severely reduced postnatal viability; approximately 25% lack a midgut and essentially all survivors show severe gut architecture disruption traceable to late embryonic development, establishing an essential physiological role for MTG8 in gastrointestinal development.","method":"Gene targeting (insertional inactivation), histology, developmental analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — definitive knockout mouse model with clear phenotypic readout, peer-reviewed","pmids":["11463846"],"is_preprint":false},{"year":2001,"finding":"AML1-ETO suppresses C/EBPalpha expression, indirectly by inhibiting positive autoregulation of the CEBPA promoter. Conditional expression of AML1-ETO in U937 cells downregulates CEBPA mRNA, protein, and DNA-binding activity; conditional C/EBPalpha expression in Kasumi-1 cells restores neutrophilic differentiation.","method":"Conditional expression system, RT-PCR, Western blot, EMSA, neutrophilic differentiation assays","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (expression, protein, DNA binding, differentiation rescue), replicated in multiple cell lines","pmids":["11283671"],"is_preprint":false},{"year":2002,"finding":"AML1-ETO expression in human CD34+ hematopoietic stem/progenitor cells inhibits colony formation by committed progenitors but enhances stem cell (CAFC) growth, resulting in a profound survival advantage and sustained CD34 expression over 5-week long-term cultures.","method":"Retroviral gene transfer into human CD34+ cells, clonogenic assays, long-term stromal cocultures, CAFC assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct gain-of-function in primary human cells with multiple functional readouts","pmids":["11756147"],"is_preprint":false},{"year":2003,"finding":"ETO associates with N-CoR/Sin3A/HDAC complexes in vivo and acts as a corepressor for the promyelocytic zinc finger protein (PLZF). ETO is localized to the nuclear matrix at sites coincident with HDAC enzymes and mSin3A, establishing ETO proteins as transcriptional corepressors.","method":"Co-immunoprecipitation, nuclear matrix fractionation, transcriptional reporter assays (reviewed)","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — review citing multiple experimental studies; co-IP and functional data from original research, replicated across labs","pmids":["12559562"],"is_preprint":false},{"year":2003,"finding":"ETO interacts with Gfi-1 and Gfi-1B both in vitro and in vivo. Gfi-1 co-localizes with ETO in punctate subnuclear structures associated with the nuclear matrix, and Gfi-1 associates with HDAC-1, HDAC-2, and HDAC-3 when co-expressed in mammalian cells, suggesting ETO recruits Gfi-1 to HDAC complexes for transcriptional repression.","method":"In vitro binding assay, co-immunoprecipitation, immunofluorescence co-localization, nuclear matrix fractionation","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro plus in vivo binding and co-localization, single lab, multiple orthogonal methods","pmids":["12874834"],"is_preprint":false},{"year":2003,"finding":"AML1-ETO binds to the c-FMS intronic regulatory region (not just the promoter) in t(8;21) leukemic cells. AML1-ETO binding correlates with changes in histone modification patterns and increased association of histone deacetylases at the c-FMS locus, while not irreversibly displacing other transcription factors.","method":"In vivo footprinting, chromatin immunoprecipitation (ChIP) assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct ChIP and in vivo footprinting on endogenous target gene in leukemic cells, multiple orthogonal methods","pmids":["12773394"],"is_preprint":false},{"year":2003,"finding":"ETO acts as a bona fide corepressor for Bcl-6. ETO and Bcl-6 interact and co-localize in nuclear speckles in normal and malignant lymphoid tissue. ETO binds to the fourth zinc finger of Bcl-6, enhances Bcl-6 repression in an HDAC-dependent manner, and forms a complex with Bcl-6 on promoters of endogenous Bcl-6 target genes.","method":"Co-immunoprecipitation, immunofluorescence, reporter gene assay with HDAC inhibitor, chromatin immunoprecipitation","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, co-localization, ChIP on endogenous targets, HDAC-dependence assay; multiple orthogonal methods","pmids":["14551142"],"is_preprint":false},{"year":2004,"finding":"AML1-ETO, as well as ETO alone, inhibits transcriptional activation by E proteins (E2A, HEB) through stable interactions mediated by a conserved ETO TAF4 homology domain (eTAFH) with a 17-amino acid motif (AD1) of E proteins, precluding recruitment of p300/CBP coactivators. In t(8;21) leukemic cells, AML1-ETO silences E protein function through an aberrant cofactor exchange mechanism.","method":"Co-immunoprecipitation, mass spectrometry, transcriptional reporter assays, domain mapping by mutagenesis","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical reconstitution, mass spectrometry identification, mutagenesis, and functional reporter assays; multiple orthogonal methods in a single rigorous study","pmids":["15333839"],"is_preprint":false},{"year":2004,"finding":"Deletion of the AML1-ETO C-terminal NCoR/SMRT-interacting domain (NHR3-NHR4 region) transforms AML1-ETO from an insufficient leukemogen into a potent leukemogenic protein that promotes in vitro growth and does not obstruct cell-cycle machinery, indicating this domain normally acts as a restraint on full leukemogenic activity.","method":"C-terminal truncation mutants, retroviral bone marrow transduction, murine transplantation model, cell cycle analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse leukemia model with domain deletion mutants plus in vitro cell cycle analysis","pmids":["15569932"],"is_preprint":false},{"year":2004,"finding":"ETO/MTG8 is highly expressed in preadipocytes and acts as an inhibitor of C/EBPbeta during early adipogenesis. ETO prevents transcriptional activation of the C/EBPalpha promoter by C/EBPbeta and its accumulation in centromeric sites. ETO expression rapidly decreases upon initiation of adipogenesis; this decrease is essential for normal adipogenic gene expression.","method":"Expression analysis, gain/loss-of-function in preadipocyte differentiation assays, promoter reporter assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function and gain-of-function with specific cellular readouts, single lab","pmids":["15509789"],"is_preprint":false},{"year":2005,"finding":"RUNX1/MTG8 recruits DNMT1 to the IL-3 promoter, forming a RUNX1/MTG8-DNMT1 repressor complex. Physical association was confirmed by co-immunoprecipitation. Co-expression of RUNX1/MTG8 with DNMT1 enhances repression of IL-3, and both are concurrently released or stabilized at the promoter by HDAC or DNMT inhibitors respectively.","method":"Chromatin immunoprecipitation (ChIP), co-immunoprecipitation, co-transfection reporter assay in 293T cells","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP on endogenous target in primary AML blasts plus co-IP plus functional co-expression assay; multiple orthogonal methods","pmids":["15735013"],"is_preprint":false},{"year":2001,"finding":"siRNA-mediated suppression of AML1/MTG8 in Kasumi-1 and SKNO-1 t(8;21) leukemic cells increases susceptibility to TGFbeta1/vitamin D3-induced differentiation, upregulates CD11b, M-CSF receptor, and C/EBPalpha, induces cell shape changes, and reduces clonogenicity, demonstrating that AML1/MTG8 actively maintains a block to differentiation.","method":"siRNA knockdown, flow cytometry, colony formation assay, Western blot","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific loss-of-function by siRNA with multiple differentiation readouts, replicated in two cell lines","pmids":["12480707"],"is_preprint":false},{"year":2008,"finding":"ETO (but not AML1/ETO) directly interacts with SHARP and augments SHARP-mediated repression of Notch target genes in an HDAC-dependent manner. ETO is a component of the endogenous RBP-Jkappa corepressor complex and is found at Notch target gene promoters. AML1/ETO overexpression or ETO knockdown each activates Notch target genes, indicating AML1/ETO disrupts ETO's normal repressive function at these genes.","method":"Co-immunoprecipitation, ChIP, reporter gene assay with HDAC inhibitor, siRNA knockdown, overexpression studies","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, ChIP, functional reporter with inhibitors, both gain and loss of function; multiple orthogonal methods","pmids":["18332109"],"is_preprint":false},{"year":2008,"finding":"AML1-ETO redirects myeloerythroid progenitors from erythroid to granulocytic fate in zebrafish by suppressing scl expression. Restoration of scl rescues AML1-ETO's effects on hematopoietic cell fate. HDAC inhibitor treatment restores scl and gata1 expression and ameliorates granulocytic accumulation.","method":"Inducible transgenic zebrafish model, genetic rescue (scl re-expression), pharmacological HDAC inhibition, in vivo imaging","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis with rescue experiment, pharmacological validation, multiple readouts","pmids":["18156164"],"is_preprint":false},{"year":2009,"finding":"The solution structure of the AML1-ETO eTAFH domain in complex with a HEB peptide was determined by NMR. Structure-guided mutations at key ETO residues for HEB binding do not impair AML1-ETO's ability to enhance clonogenic capacity of primary bone marrow cells or repress granulocyte differentiation, indicating the eTAFH–E protein interaction contributes relatively little to AML1-ETO activity.","method":"NMR structure determination, structure-guided mutagenesis, primary bone marrow clonogenic assay, differentiation assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure plus structure-guided mutagenesis with functional cellular validation","pmids":["19204326"],"is_preprint":false},{"year":2009,"finding":"CBFbeta is required for AML1-ETO activity: amino acid substitutions in the Runt domain disrupting CBFbeta heterodimerization (but not DNA binding) impair AML1-ETO's inhibition of granulocyte differentiation, abolish its enhancement of clonogenic potential of primary mouse bone marrow cells, and abrogate its cooperativity with TEL-PDGFbetaR in inducing AML in mice.","method":"Runt domain mutagenesis, primary mouse bone marrow clonogenic assay, murine leukemia transplantation model, differentiation assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — structure-guided mutagenesis validated in multiple in vitro and in vivo assays including mouse leukemia model","pmids":["19179469"],"is_preprint":false},{"year":2010,"finding":"The NHR2 domain of RUNX1/ETO mediates a dimer-to-tetramer transition. A cluster of 5 amino acids at the NHR2 dimer-tetramer interface are critical; substitutions abolish tetramer (but not dimer) formation. RUNX1/ETO dimers fail to bind DNA efficiently, fail to alter RUNX1-dependent gene expression, fail to block myeloid differentiation, fail to enhance hematopoietic progenitor self-renewal, and fail to induce leukemia in a murine transplantation model.","method":"Mutagenesis, biophysical analysis (structural/energetic), DNA binding assay, gene expression analysis, murine transplantation model, hematopoietic differentiation assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Strong — combined biophysical/structural analysis with mutagenesis and multiple in vitro and in vivo functional assays","pmids":["20430957"],"is_preprint":false},{"year":2010,"finding":"The solution structure of the AML1-ETO NHR3 domain in complex with PKA RIIalpha was determined by NMR. A key mutation abolishing PKA RIIalpha binding does not disrupt AML1-ETO's ability to enhance clonogenic capacity, repress proliferation or differentiation, or induce leukemia in vivo, indicating the NHR3-PKA RIIalpha interaction does not significantly contribute to AML1-ETO leukemogenesis.","method":"NMR structure determination, structure-guided mutagenesis, primary bone marrow clonogenic assay, in vivo leukemia model","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure plus mutagenesis validated in vivo; negative mechanistic result rigorously established","pmids":["20708017"],"is_preprint":false},{"year":2008,"finding":"RUNX1/AML1 DNA-binding domain and the ETO NHR2-dimerization domain are critical for AML1-ETO9a-induced leukemia in mice; the NHR1 domain is not required. A region between NHR1 and NHR2 influences leukemia latency.","method":"Domain deletion/mutation mutants, murine bone marrow transduction and transplantation model, leukemia latency analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain mapping in definitive in vivo leukemia model with multiple mutants","pmids":["19036704"],"is_preprint":false},{"year":2015,"finding":"AML1/ETO and HIF1alpha form a positive regulatory circuit and cooperate to transactivate the DNMT3a gene promoter, leading to DNA hypermethylation. Pharmacological or genetic disruption of the AML1/ETO-HIF1alpha loop causes DNA hypomethylation and re-expression of the hypermethylated tumor suppressor p15(INK4b).","method":"Co-immunoprecipitation, chromatin immunoprecipitation, promoter reporter assays, siRNA knockdown, xenograft mouse model","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus ChIP plus functional reporter, single lab, multiple methods","pmids":["25727291"],"is_preprint":false},{"year":2017,"finding":"The E3 ubiquitin ligase STUB1 binds to RUNX1 and RUNX1-RUNX1T1, induces their ubiquitination and proteasomal degradation, and promotes nuclear export of RUNX1. STUB1 overexpression shows substantial growth-inhibitory effect specifically in RUNX1-RUNX1T1-expressing myeloid leukemia cells.","method":"High-throughput binding assay, co-immunoprecipitation, ubiquitination assay, immunofluorescence, cell viability assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, and localization study in single lab with multiple methods","pmids":["28536267"],"is_preprint":false},{"year":2018,"finding":"RUNX1/ETO cooperates with AP-1 to drive CCND2 (Cyclin D2) expression, maintaining leukemic cell cycle progression. Knockdown or pharmacological inhibition of CCND2 significantly impairs leukemic expansion and engraftment of patient-derived AML cells.","method":"RNAi screen guided by epigenomic profiling, ChIP-seq, siRNA knockdown, pharmacological inhibition, patient-derived xenograft model","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide binding data plus functional validation in patient-derived cells and in vivo model, multiple orthogonal methods","pmids":["30300583"],"is_preprint":false},{"year":2019,"finding":"TAF1 associates with K43-acetylated AML1-ETO. TAF1 binding sites significantly overlap with AML1-ETO binding sites genome-wide. TAF1 knockdown alters AML1-ETO chromatin association and expression of both activated and repressed AML1-ETO target genes. TAF1 is required for leukemic cell self-renewal, and its reduction promotes differentiation and apoptosis.","method":"Co-immunoprecipitation, ChIP-sequencing, siRNA knockdown, self-renewal assay","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus ChIP-seq plus loss-of-function; single lab","pmids":["31664040"],"is_preprint":false},{"year":2019,"finding":"EZH1 WD domain binds to the AML1-ETO NHR1 domain and methylates AML1-ETO at lysine 43 (Lys43) via its SET domain. This methylation augments AML1-ETO-dependent repression of tumor suppressor genes. Loss of Lys43 methylation by point mutation or domain deletion impairs AML1-ETO repressive activity.","method":"Co-immunoprecipitation, in vitro methylation assay, point mutation analysis, ChIP, reporter gene assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro methylation assay plus mutagenesis plus ChIP plus functional reporter; multiple orthogonal methods identifying a specific PTM","pmids":["31699991"],"is_preprint":false},{"year":2020,"finding":"Rapid degradation of AML1-ETO using an inducible degron system, combined with CUT&RUN and nascent transcript analysis, identifies a small core transcriptional circuit directly regulated by AML1-ETO. Derepression of this network upon AML1-ETO removal is associated with RUNX1 DNA binding and triggers a transcription cascade leading to myeloid differentiation.","method":"Inducible protein degradation, CUT&RUN chromatin binding assay, nascent transcript analysis (TT-seq or equivalent)","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — rapid inducible loss-of-function with genome-wide direct target identification using multiple cutting-edge orthogonal approaches","pmids":["33382982"],"is_preprint":false},{"year":2020,"finding":"MTG8 (RUNX1T1) and MTG16 are highly expressed in +4/5 early intestinal progenitors. Their expression is repressed by Notch signaling via ATOH1. Knockout of MTG8 or MTG16 in mice causes crypt hyperproliferation, expansion of intestinal stem cells, and impaired enterocyte differentiation. ChIP-seq shows MTG16 directly binds and represses promoters of intestinal stem cell genes (Lgr5, Ascl2) and ATOH1-regulated enhancers.","method":"Mouse knockout, intestinal organoids, ChIP-seq, RNA-seq, histology, immunohistochemistry","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with ChIP-seq and RNA-seq and multiple functional readouts; highly mechanistic study","pmids":["32553763"],"is_preprint":false},{"year":2021,"finding":"RUNX1/RUNX1T1 regulates alternative RNA splicing in leukemic cells through two principal mechanisms: (i) regulation of alternative transcription start site selection affecting 5'-UTR structure, and (ii) control of splicing factor gene expression, generating alternative transcripts with new internal junctions.","method":"RNA-seq, transcriptome analysis, siRNA knockdown of RUNX1/RUNX1T1","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — comprehensive transcriptomic analysis with loss-of-function, single lab","pmids":["33483506"],"is_preprint":false},{"year":2022,"finding":"PLCG1 is induced by AML1-ETO binding to intergenic regulatory DNA elements. Genetic inactivation of PLCG1 in murine and human AML inhibits AML1-ETO-dependent self-renewal programs, leukemic proliferation, and leukemia maintenance in vivo, while PLCG1 is dispensable for normal hematopoietic stem and progenitor cell function.","method":"Proteomics, ChIP-seq (AE binding to PLCG1 locus), genetic inactivation (murine and human), in vivo leukemia model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq plus genetic loss-of-function in both murine and human cells plus in vivo validation; multiple orthogonal approaches","pmids":["34695195"],"is_preprint":false},{"year":2004,"finding":"AML1-ETO decreases interactions between ETO-2/MTG16 and N-CoR. The MYND domain of AML1-ETO competitively occupies the ETO-2 binding site on N-CoR. Expression of the MYND domain alone in 32Dcl3 and human CD34+ cells prevents granulocyte but not macrophage differentiation, recapitulating a key effect of AML1-ETO.","method":"Co-immunoprecipitation, ectopic expression of MYND domain, hematopoietic differentiation assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional differentiation assay with domain-specific construct, single lab","pmids":["15231665"],"is_preprint":false},{"year":2015,"finding":"The ETO-family co-repressor MTGR1 mediates Prdm14 repressive function in embryonic stem cells and primordial germ cell formation. MTGR1 tightly binds to the pre-SET/SET domains of Prdm14 and co-occupies its genomic targets. Crystal structure of the Prdm14-Mtgr1 complex was determined. Structure-guided point mutants and a monobody inhibitor of the Prdm14-Mtgr1 interaction abrogate Prdm14 function in mESC gene expression and PGC formation.","method":"Crystal structure determination, co-immunoprecipitation, ChIP-seq, structure-guided mutagenesis, synthetic monobody inhibitor, ESC differentiation assay","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus ChIP-seq plus functional cellular rescue experiments; multiple orthogonal methods in one study","pmids":["26523391"],"is_preprint":false}],"current_model":"RUNX1T1 (ETO/MTG8) is a transcriptional co-repressor that functions by recruiting histone deacetylase complexes (via N-CoR/SMRT/Sin3A) to DNA-bound transcription factors; its NHR2 domain drives obligatory oligomerization required for high-affinity corepressor interaction, its NHR3 domain interacts with PKA RIIα, its NHR4/MYND domain binds corepressors, and its eTAFH domain interacts with E proteins. When fused to RUNX1 in t(8;21) AML, the resulting AML1-ETO fusion protein dominantly represses RUNX1 target genes (including CEBPA, c-FMS, IL-3, and PLCG1), silences E protein function via aberrant cofactor exchange, recruits DNMT1 to impose DNA methylation, undergoes activating methylation at Lys43 by EZH1 and ubiquitination/degradation by STUB1, cooperates with AP-1 to drive CCND2-dependent cell cycle progression, and blocks myeloid differentiation while enhancing hematopoietic stem cell self-renewal. In normal physiology, MTG8 is essential for gut morphogenesis, inhibits C/EBPβ during early adipogenesis, represses Notch target genes through the RBP-Jκ/SHARP complex, and (as MTGR1) mediates Prdm14-dependent repression in embryonic stem cells."},"narrative":{"mechanistic_narrative":"RUNX1T1 (ETO/MTG8) is a nuclear-matrix-associated transcriptional co-repressor that represses target genes by recruiting histone deacetylase complexes to DNA-bound transcription factors [PMID:8781439, PMID:12559562]. It assembles with N-CoR/SMRT/Sin3A/HDAC corepressor machinery and serves as an obligate corepressor for sequence-specific factors including PLZF, Gfi-1/Gfi-1B, Bcl-6, and the RBP-Jκ/SHARP Notch complex, in each case enforcing HDAC-dependent silencing [PMID:12559562, PMID:12874834, PMID:14551142, PMID:18332109]. High-affinity corepressor engagement depends on self-association through the NHR2 domain, which drives a dimer-to-tetramer transition required for SMRT/N-CoR binding and repression, while the MYND domain competes for the N-CoR binding site, the NHR3 domain binds PKA RIIα, and the eTAFH domain captures the AD1 motif of E proteins (E2A, HEB) [PMID:11113190, PMID:15333839, PMID:15231665, PMID:20430957]. In physiology, RUNX1T1 is essential for gastrointestinal development, restrains intestinal stem cell genes (Lgr5, Ascl2) and ATOH1 enhancers downstream of Notch, and inhibits C/EBPβ during early adipogenesis [PMID:11463846, PMID:32553763, PMID:15509789]; the family member MTGR1 mediates Prdm14-dependent repression in embryonic stem cells and germ-cell formation [PMID:26523391]. The t(8;21) translocation fuses the RUNX1 runt domain to most of RUNX1T1, producing AML1-ETO, which acts as a dominant repressor of RUNX1 target genes and blocks fetal liver hematopoiesis in vivo [PMID:8334990, PMID:9054947]. AML1-ETO requires CBFβ heterodimerization and NHR2-mediated oligomerization to block myeloid differentiation and enhance stem/progenitor self-renewal [PMID:19179469, PMID:20430957, PMID:11756147, PMID:12480707], silences CEBPA and E-protein function, redirects hematopoietic fate by suppressing scl, recruits DNMT1/DNMT3a to impose DNA hypermethylation, and is regulated by Lys43 methylation via EZH1, by TAF1 binding to acetylated Lys43, and by STUB1-mediated ubiquitin-degradation [PMID:11283671, PMID:15333839, PMID:18156164, PMID:15735013, PMID:25727291, PMID:31699991, PMID:31664040, PMID:28536267]. It drives leukemic proliferation through AP-1/CCND2 and PLCG1 programs, and rapid degradation of AML1-ETO derepresses a core circuit that triggers RUNX1-dependent myeloid differentiation [PMID:30300583, PMID:34695195, PMID:33382982].","teleology":[{"year":1993,"claim":"Defining the molecular lesion of t(8;21) AML by cloning the fusion gene established that a novel chromosome-8 gene, MTG8/ETO, is recurrently joined to AML1.","evidence":"RT-PCR, cDNA cloning, and Northern blot across t(8;21) patients and cell lines","pmids":["8334990","8353289"],"confidence":"High","gaps":["Did not define the biochemical function of the fusion or wild-type ETO","No mechanism for how the fusion alters transcription"]},{"year":1996,"claim":"Characterizing endogenous ETO showed it is a nuclear-matrix phosphoprotein expressed in normal CD34+ progenitors, indicating a physiological role beyond the leukemic fusion.","evidence":"32P-labeling immunoprecipitation, immunofluorescence, and subcellular fractionation in hematopoietic cells","pmids":["8781439"],"confidence":"Medium","gaps":["Function of nuclear-matrix localization unresolved","No transcriptional targets identified"]},{"year":1997,"claim":"An AML1-ETO knock-in mouse demonstrated the fusion is a dominant inhibitor of normal AML1 function in vivo, phenocopying AML1/CBFβ loss.","evidence":"Gene-targeted knock-in mouse and fetal liver colony-forming assays","pmids":["9054947"],"confidence":"High","gaps":["Embryonic lethality precluded analysis of leukemogenesis","Did not identify the repression mechanism"]},{"year":2001,"claim":"Identifying ETO as a corepressor and mapping NHR2-driven oligomerization established the core biochemical mechanism: self-association is required for high-affinity N-CoR/SMRT binding and for blocking differentiation.","evidence":"Co-IP, in vitro reconstitution, reporter repression, and differentiation assays with deletion/fusion mutants; parallel knockout and PKA-binding studies","pmids":["11113190","9447981","11593431","11463846","12480707"],"confidence":"High","gaps":["Stoichiometry of the oligomer not yet resolved at this stage","Endogenous target genes not yet mapped"]},{"year":2003,"claim":"Cataloguing the corepressor partners (PLZF, Gfi-1/Gfi-1B, Bcl-6) and demonstrating ChIP occupancy at endogenous targets (c-FMS) established ETO as a general HDAC-recruiting corepressor for sequence-specific factors.","evidence":"Co-IP, immunofluorescence co-localization, ChIP, and HDAC-dependent reporter assays","pmids":["12559562","12874834","14551142","12773394"],"confidence":"High","gaps":["Selectivity rules for partner recruitment unclear","Relative contribution of each partner to leukemia not weighted"]},{"year":2004,"claim":"Mapping the eTAFH–E-protein and MYND–N-CoR interfaces revealed how AML1-ETO silences E proteins and rewires corepressor competition, and showed the NHR3-NHR4 region restrains full leukemogenic potential.","evidence":"Co-IP, mass spectrometry, domain mapping, and in vivo leukemia models with truncation mutants","pmids":["15333839","15231665","15569932"],"confidence":"High","gaps":["How the C-terminal restraint is relieved in patients unclear","Relative weighting of each interface for transformation not yet resolved"]},{"year":2005,"claim":"Linking RUNX1/MTG8 to DNMT1 recruitment at the IL-3 promoter connected the corepressor to heritable DNA methylation, broadening its silencing mechanism beyond histone deacetylation.","evidence":"ChIP on AML blasts, co-IP, and co-expression repression assays","pmids":["15735013"],"confidence":"High","gaps":["Genome-wide extent of methylation targeting not defined here","Direct vs. indirect DNMT recruitment not distinguished"]},{"year":2008,"claim":"In vivo zebrafish, Notch-pathway, and domain-mapping studies showed AML1-ETO redirects hematopoietic fate by suppressing scl, disrupts ETO's normal RBP-Jκ/SHARP repression, and requires the RUNX1 DNA-binding and NHR2 domains for leukemia.","evidence":"Inducible transgenic zebrafish with scl rescue, co-IP/ChIP at Notch targets, and murine domain-deletion leukemia models","pmids":["18156164","18332109","19036704"],"confidence":"High","gaps":["Mechanism of cofactor exchange at Notch targets not fully reconstituted","How fate redirection integrates with self-renewal unclear"]},{"year":2009,"claim":"Structure-guided dissection of individual interaction surfaces (eTAFH–HEB, CBFβ heterodimerization) parsed which contacts actually drive transformation, finding the E-protein contact dispensable but CBFβ binding essential.","evidence":"NMR structures, structure-guided mutagenesis, primary bone marrow clonogenic assays, and murine leukemia models","pmids":["19204326","19179469"],"confidence":"High","gaps":["Why CBFβ is required despite the runt-fusion context not fully explained","Compensating activities of other domains not quantified"]},{"year":2010,"claim":"Biophysical and structural analysis resolved that NHR2 dimer-to-tetramer assembly, not the NHR3-PKA contact, is the obligate oligomerization step for DNA binding, gene regulation, and leukemia.","evidence":"Biophysical/energetic analysis, interface mutagenesis, DNA-binding and gene-expression assays, and murine transplantation; NMR of the NHR3-PKA RIIα complex with functional mutants","pmids":["20430957","20708017"],"confidence":"High","gaps":["Druggability of the tetramer interface in vivo not established","How tetramerization templates target-gene selection unclear"]},{"year":2015,"claim":"Identifying the AML1/ETO–HIF1α loop driving DNMT3a expansion clarified how the fusion enforces tumor-suppressor hypermethylation as a maintainable circuit.","evidence":"Co-IP, ChIP, promoter reporters, siRNA knockdown, and xenograft models; structural/mechanistic work on MTGR1-Prdm14 in ESCs","pmids":["25727291","26523391"],"confidence":"Medium","gaps":["Direct vs. cooperative DNMT3a transactivation not fully separated","Generality of the HIF1α circuit across patients untested"]},{"year":2019,"claim":"Discovery of EZH1-mediated Lys43 methylation and TAF1 binding to acetylated Lys43 established post-translational modification of the fusion as a tunable switch for its repressive activity and chromatin association.","evidence":"In vitro methylation assays, co-IP, ChIP/ChIP-seq, point mutagenesis, and self-renewal assays","pmids":["31699991","31664040"],"confidence":"High","gaps":["Interplay between K43 methylation and acetylation not resolved","Upstream signals controlling these PTMs unknown"]},{"year":2020,"claim":"Defining the normal intestinal role and using rapid degron-based AML1-ETO removal connected the corepressor's physiological stem-cell restraint to its leukemic block, showing fusion loss triggers RUNX1-dependent differentiation.","evidence":"Mouse knockouts, organoids, CUT&RUN/ChIP-seq, and inducible degron with nascent transcript analysis","pmids":["32553763","33382982"],"confidence":"High","gaps":["Direct primary targets of wild-type RUNX1T1 in hematopoiesis incompletely mapped","Kinetics of corepressor reassembly after differentiation unclear"]},{"year":2022,"claim":"Functional genomics nominated AP-1/CCND2 and PLCG1 as leukemia-specific effector programs of AML1-ETO, distinguishing oncogenic dependencies from normal HSPC requirements.","evidence":"ChIP-seq, RNAi/pharmacological inhibition, genetic inactivation in murine and human AML, and patient-derived xenografts; transcriptome-wide splicing analysis","pmids":["30300583","34695195","33483506"],"confidence":"High","gaps":["How splicing regulation integrates with the transcriptional program unclear","Therapeutic window of these dependencies in patients untested"]},{"year":null,"claim":"How RUNX1T1 oligomerization, partner selectivity, and the layered DNA/histone-methylation and PTM controls integrate to specify target-gene choice in normal versus leukemic cells remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No unified model linking tetramer assembly to genome-wide target specificity","Druggable interface or PTM node for clinical intervention not validated","Full physiological target set of wild-type RUNX1T1 across tissues incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[13,16,22,35]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[8,13,16,22,38]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[15,26,35]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[13,15]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,6]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[2,6,7]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[13,16,22,34]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,3,31,37]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[15,20,29,33]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[10,35,39]}],"complexes":["N-CoR/SMRT-Sin3A-HDAC corepressor complex","RBP-Jκ/SHARP Notch corepressor complex","AML1-ETO fusion oligomer (t(8;21))"],"partners":["RUNX1","CBFB","NCOR1","SMRT","MTGR1","BCL6","DNMT1","EZH1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q06455","full_name":"Protein CBFA2T1","aliases":["Cyclin-D-related protein","Eight twenty one protein","Protein ETO","Protein MTG8","Zinc finger MYND domain-containing protein 2"],"length_aa":604,"mass_kda":67.6,"function":"Transcriptional corepressor which facilitates transcriptional repression via its association with DNA-binding transcription factors and recruitment of other corepressors and histone-modifying enzymes (PubMed:10688654, PubMed:12559562, PubMed:15203199). Can repress the expression of MMP7 in a ZBTB33-dependent manner (PubMed:23251453). Can repress transactivation mediated by TCF12 (PubMed:16803958). Acts as a negative regulator of adipogenesis (By similarity). The AML1-MTG8/ETO fusion protein frequently found in leukemic cells is involved in leukemogenesis and contributes to hematopoietic stem/progenitor cell self-renewal (PubMed:23812588)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q06455/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RUNX1T1","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RUNX1T1","total_profiled":1310},"omim":[{"mim_id":"613484","title":"SPEN FAMILY TRANSCRIPTIONAL REPRESSOR; SPEN","url":"https://www.omim.org/entry/613484"},{"mim_id":"603672","title":"CORE-BINDING FACTOR, RUNT DOMAIN, ALPHA SUBUNIT 2, TRANSLOCATED TO, 2; CBFA2T2","url":"https://www.omim.org/entry/603672"},{"mim_id":"602228","title":"TRANSCRIPTION FACTOR 7-LIKE 2; TCF7L2","url":"https://www.omim.org/entry/602228"},{"mim_id":"300694","title":"MICRO RNA 223; MIR223","url":"https://www.omim.org/entry/300694"},{"mim_id":"133435","title":"RUNT-RELATED TRANSCRIPTION FACTOR 1, TRANSLOCATED TO, 1; RUNX1T1","url":"https://www.omim.org/entry/133435"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":16.6}],"url":"https://www.proteinatlas.org/search/RUNX1T1"},"hgnc":{"alias_symbol":["CDR","ETO","MTG8","ZMYND2"],"prev_symbol":["AML1T1","CBFA2T1"]},"alphafold":{"accession":"Q06455","domains":[{"cath_id":"1.20.120.1110","chopping":"118-218","consensus_level":"high","plddt":85.7046,"start":118,"end":218},{"cath_id":"-","chopping":"514-557","consensus_level":"medium","plddt":87.4266,"start":514,"end":557}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06455","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q06455-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q06455-F1-predicted_aligned_error_v6.png","plddt_mean":63.41},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RUNX1T1","jax_strain_url":"https://www.jax.org/strain/search?query=RUNX1T1"},"sequence":{"accession":"Q06455","fasta_url":"https://rest.uniprot.org/uniprotkb/Q06455.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q06455/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06455"}},"corpus_meta":[{"pmid":"8334990","id":"PMC_8334990","title":"The 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The predicted fusion protein contains the runt homology region of AML1 and most of MTG8, which contains putative zinc finger DNA binding motifs and proline-rich regions.\",\n      \"method\": \"RT-PCR, cDNA cloning, Northern blot analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — foundational molecular cloning study establishing the fusion gene structure, replicated immediately in same year by independent group\",\n      \"pmids\": [\"8334990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"AML1/MTG8(ETO) fusion junctions are constant in t(8;21) AML; MTG8 (ETO) transcripts (7.8 kb and 6.2 kb) are detected in t(8;21) cell lines but not in non-t(8;21) lines, confirming the fusion is a consistent feature of this translocation.\",\n      \"method\": \"RT-PCR, Northern blot analysis, cDNA cloning\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — replicated molecular characterization confirmed across multiple patients and cell lines\",\n      \"pmids\": [\"8353289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"ETO protein is a nuclear phosphoprotein (phosphorylated on serine and threonine) and is associated with the nuclear matrix. ETO is coexpressed with AML1 in megakaryocytes and is unexpectedly present in normal CD34+ hematopoietic progenitor cells.\",\n      \"method\": \"Immunoprecipitation of 32P-labeled proteins, immunofluorescence, subcellular fractionation, Western blot\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical fractionation and immunoprecipitation in multiple cell types, single lab\",\n      \"pmids\": [\"8781439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Knock-in of AML1-ETO into the mouse AML1 locus causes embryonic lethality with hemorrhaging in the CNS and a severe block in fetal liver hematopoiesis, phenocopying homozygous loss of AML1 or CBFbeta, indicating AML1-ETO blocks normal AML1 function in vivo.\",\n      \"method\": \"Gene targeting (knock-in mouse model), hematopoietic colony forming unit assays\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — definitive in vivo genetic epistasis experiment showing dominant-negative function, replicated by other labs\",\n      \"pmids\": [\"9054947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"AML1-MTG8 fusion protein specifically and strongly interacts with MTGR1 (an MTG8 family member) through a 51-residue region (aa 488–538) containing NHR2. This interaction is required for AML1-MTG8 to stimulate G-CSF-dependent proliferation of myeloid progenitor cells and to interfere with AML1-dependent transcription.\",\n      \"method\": \"Co-immunoprecipitation, C-terminal deletion mutant analysis, ectopic expression in L-G myeloid progenitor cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus mutant functional analysis in cellular model, multiple orthogonal methods\",\n      \"pmids\": [\"9447981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"AML1/ETO(MTG8) accumulates CBFbeta (PEBP2beta) in the nucleus more efficiently than wild-type AML1, and associates with CBFbeta more effectively than wild-type AML1, dependent on the runt domain of the fusion protein.\",\n      \"method\": \"Immunofluorescence labeling, subcellular fractionation, co-immunoprecipitation in COS-7 cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization and binding experiments, single lab, two orthogonal methods\",\n      \"pmids\": [\"9473235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ETO (MTG8) and AML1/ETO are associated with the nuclear matrix. A 40 amino acid region of ETO (aa 241–280), specifically lysine 265 and/or arginine 266, is sufficient for nuclear import via an importin-alpha/beta mediated pathway. ETO and AML1/ETO co-localize to punctate nuclear bodies distinct from PML bodies.\",\n      \"method\": \"GFP fusion fluorescence microscopy in living cells, mutational analysis, in vitro importin binding assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live cell imaging plus in vitro binding assay and mutagenesis, single lab\",\n      \"pmids\": [\"10951564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Atrophin-1 (DRPLA protein) interacts with ETO/MTG8 in the nuclear matrix. When co-transfected, atrophin-1 is recruited to nuclear structures containing mSin3A and histone deacetylases, and atrophin-1 represses transcription, suggesting ETO/MTG8 links atrophin-1 to nuclear receptor corepressor complexes.\",\n      \"method\": \"Yeast two-hybrid, co-transfection/co-localization in Neuro-2a cells, nuclear matrix fractionation from transgenic mouse brain, transcriptional repression assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus co-localization and fractionation, single lab, multiple methods\",\n      \"pmids\": [\"10973986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ETO oligomerization mediated by NHR2 is required for interaction with corepressors SMRT and N-CoR. NHR2 mediates oligomerization of both ETO and AML1-ETO; polypeptides containing only NHR4 are insufficient for SMRT interaction, but fusion of NHR4 to a heterologous dimerization domain restores SMRT binding in vitro. NHR2 is also required for ETO repression function and inhibition of hematopoietic differentiation by AML1-ETO.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assay, reporter gene repression assay, hematopoietic differentiation assay, deletion and fusion mutants\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in vitro plus mutagenesis plus functional cellular assays, multiple orthogonal methods\",\n      \"pmids\": [\"11113190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"MTG8 interacts with the regulatory subunit of type II cAMP-dependent protein kinase (PKA RIIalpha) via its NHR3 domain (which contains a putative alpha-amphipathic helix characteristic of AKAPs). MTG8 and RIIalpha co-localize at the centrosome-Golgi area in lymphocytes.\",\n      \"method\": \"Co-immunoprecipitation, indirect immunofluorescence microscopy, domain mapping\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus co-localization with domain mapping, single lab\",\n      \"pmids\": [\"11593431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"MTG8 knockout mice show severely reduced postnatal viability; approximately 25% lack a midgut and essentially all survivors show severe gut architecture disruption traceable to late embryonic development, establishing an essential physiological role for MTG8 in gastrointestinal development.\",\n      \"method\": \"Gene targeting (insertional inactivation), histology, developmental analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — definitive knockout mouse model with clear phenotypic readout, peer-reviewed\",\n      \"pmids\": [\"11463846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"AML1-ETO suppresses C/EBPalpha expression, indirectly by inhibiting positive autoregulation of the CEBPA promoter. Conditional expression of AML1-ETO in U937 cells downregulates CEBPA mRNA, protein, and DNA-binding activity; conditional C/EBPalpha expression in Kasumi-1 cells restores neutrophilic differentiation.\",\n      \"method\": \"Conditional expression system, RT-PCR, Western blot, EMSA, neutrophilic differentiation assays\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (expression, protein, DNA binding, differentiation rescue), replicated in multiple cell lines\",\n      \"pmids\": [\"11283671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"AML1-ETO expression in human CD34+ hematopoietic stem/progenitor cells inhibits colony formation by committed progenitors but enhances stem cell (CAFC) growth, resulting in a profound survival advantage and sustained CD34 expression over 5-week long-term cultures.\",\n      \"method\": \"Retroviral gene transfer into human CD34+ cells, clonogenic assays, long-term stromal cocultures, CAFC assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct gain-of-function in primary human cells with multiple functional readouts\",\n      \"pmids\": [\"11756147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ETO associates with N-CoR/Sin3A/HDAC complexes in vivo and acts as a corepressor for the promyelocytic zinc finger protein (PLZF). ETO is localized to the nuclear matrix at sites coincident with HDAC enzymes and mSin3A, establishing ETO proteins as transcriptional corepressors.\",\n      \"method\": \"Co-immunoprecipitation, nuclear matrix fractionation, transcriptional reporter assays (reviewed)\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — review citing multiple experimental studies; co-IP and functional data from original research, replicated across labs\",\n      \"pmids\": [\"12559562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ETO interacts with Gfi-1 and Gfi-1B both in vitro and in vivo. Gfi-1 co-localizes with ETO in punctate subnuclear structures associated with the nuclear matrix, and Gfi-1 associates with HDAC-1, HDAC-2, and HDAC-3 when co-expressed in mammalian cells, suggesting ETO recruits Gfi-1 to HDAC complexes for transcriptional repression.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, immunofluorescence co-localization, nuclear matrix fractionation\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro plus in vivo binding and co-localization, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"12874834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"AML1-ETO binds to the c-FMS intronic regulatory region (not just the promoter) in t(8;21) leukemic cells. AML1-ETO binding correlates with changes in histone modification patterns and increased association of histone deacetylases at the c-FMS locus, while not irreversibly displacing other transcription factors.\",\n      \"method\": \"In vivo footprinting, chromatin immunoprecipitation (ChIP) assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct ChIP and in vivo footprinting on endogenous target gene in leukemic cells, multiple orthogonal methods\",\n      \"pmids\": [\"12773394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ETO acts as a bona fide corepressor for Bcl-6. ETO and Bcl-6 interact and co-localize in nuclear speckles in normal and malignant lymphoid tissue. ETO binds to the fourth zinc finger of Bcl-6, enhances Bcl-6 repression in an HDAC-dependent manner, and forms a complex with Bcl-6 on promoters of endogenous Bcl-6 target genes.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, reporter gene assay with HDAC inhibitor, chromatin immunoprecipitation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, co-localization, ChIP on endogenous targets, HDAC-dependence assay; multiple orthogonal methods\",\n      \"pmids\": [\"14551142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"AML1-ETO, as well as ETO alone, inhibits transcriptional activation by E proteins (E2A, HEB) through stable interactions mediated by a conserved ETO TAF4 homology domain (eTAFH) with a 17-amino acid motif (AD1) of E proteins, precluding recruitment of p300/CBP coactivators. In t(8;21) leukemic cells, AML1-ETO silences E protein function through an aberrant cofactor exchange mechanism.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, transcriptional reporter assays, domain mapping by mutagenesis\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical reconstitution, mass spectrometry identification, mutagenesis, and functional reporter assays; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"15333839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Deletion of the AML1-ETO C-terminal NCoR/SMRT-interacting domain (NHR3-NHR4 region) transforms AML1-ETO from an insufficient leukemogen into a potent leukemogenic protein that promotes in vitro growth and does not obstruct cell-cycle machinery, indicating this domain normally acts as a restraint on full leukemogenic activity.\",\n      \"method\": \"C-terminal truncation mutants, retroviral bone marrow transduction, murine transplantation model, cell cycle analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse leukemia model with domain deletion mutants plus in vitro cell cycle analysis\",\n      \"pmids\": [\"15569932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ETO/MTG8 is highly expressed in preadipocytes and acts as an inhibitor of C/EBPbeta during early adipogenesis. ETO prevents transcriptional activation of the C/EBPalpha promoter by C/EBPbeta and its accumulation in centromeric sites. ETO expression rapidly decreases upon initiation of adipogenesis; this decrease is essential for normal adipogenic gene expression.\",\n      \"method\": \"Expression analysis, gain/loss-of-function in preadipocyte differentiation assays, promoter reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function and gain-of-function with specific cellular readouts, single lab\",\n      \"pmids\": [\"15509789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RUNX1/MTG8 recruits DNMT1 to the IL-3 promoter, forming a RUNX1/MTG8-DNMT1 repressor complex. Physical association was confirmed by co-immunoprecipitation. Co-expression of RUNX1/MTG8 with DNMT1 enhances repression of IL-3, and both are concurrently released or stabilized at the promoter by HDAC or DNMT inhibitors respectively.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), co-immunoprecipitation, co-transfection reporter assay in 293T cells\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP on endogenous target in primary AML blasts plus co-IP plus functional co-expression assay; multiple orthogonal methods\",\n      \"pmids\": [\"15735013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"siRNA-mediated suppression of AML1/MTG8 in Kasumi-1 and SKNO-1 t(8;21) leukemic cells increases susceptibility to TGFbeta1/vitamin D3-induced differentiation, upregulates CD11b, M-CSF receptor, and C/EBPalpha, induces cell shape changes, and reduces clonogenicity, demonstrating that AML1/MTG8 actively maintains a block to differentiation.\",\n      \"method\": \"siRNA knockdown, flow cytometry, colony formation assay, Western blot\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific loss-of-function by siRNA with multiple differentiation readouts, replicated in two cell lines\",\n      \"pmids\": [\"12480707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ETO (but not AML1/ETO) directly interacts with SHARP and augments SHARP-mediated repression of Notch target genes in an HDAC-dependent manner. ETO is a component of the endogenous RBP-Jkappa corepressor complex and is found at Notch target gene promoters. AML1/ETO overexpression or ETO knockdown each activates Notch target genes, indicating AML1/ETO disrupts ETO's normal repressive function at these genes.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, reporter gene assay with HDAC inhibitor, siRNA knockdown, overexpression studies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, ChIP, functional reporter with inhibitors, both gain and loss of function; multiple orthogonal methods\",\n      \"pmids\": [\"18332109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AML1-ETO redirects myeloerythroid progenitors from erythroid to granulocytic fate in zebrafish by suppressing scl expression. Restoration of scl rescues AML1-ETO's effects on hematopoietic cell fate. HDAC inhibitor treatment restores scl and gata1 expression and ameliorates granulocytic accumulation.\",\n      \"method\": \"Inducible transgenic zebrafish model, genetic rescue (scl re-expression), pharmacological HDAC inhibition, in vivo imaging\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis with rescue experiment, pharmacological validation, multiple readouts\",\n      \"pmids\": [\"18156164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The solution structure of the AML1-ETO eTAFH domain in complex with a HEB peptide was determined by NMR. Structure-guided mutations at key ETO residues for HEB binding do not impair AML1-ETO's ability to enhance clonogenic capacity of primary bone marrow cells or repress granulocyte differentiation, indicating the eTAFH–E protein interaction contributes relatively little to AML1-ETO activity.\",\n      \"method\": \"NMR structure determination, structure-guided mutagenesis, primary bone marrow clonogenic assay, differentiation assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure plus structure-guided mutagenesis with functional cellular validation\",\n      \"pmids\": [\"19204326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CBFbeta is required for AML1-ETO activity: amino acid substitutions in the Runt domain disrupting CBFbeta heterodimerization (but not DNA binding) impair AML1-ETO's inhibition of granulocyte differentiation, abolish its enhancement of clonogenic potential of primary mouse bone marrow cells, and abrogate its cooperativity with TEL-PDGFbetaR in inducing AML in mice.\",\n      \"method\": \"Runt domain mutagenesis, primary mouse bone marrow clonogenic assay, murine leukemia transplantation model, differentiation assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — structure-guided mutagenesis validated in multiple in vitro and in vivo assays including mouse leukemia model\",\n      \"pmids\": [\"19179469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The NHR2 domain of RUNX1/ETO mediates a dimer-to-tetramer transition. A cluster of 5 amino acids at the NHR2 dimer-tetramer interface are critical; substitutions abolish tetramer (but not dimer) formation. RUNX1/ETO dimers fail to bind DNA efficiently, fail to alter RUNX1-dependent gene expression, fail to block myeloid differentiation, fail to enhance hematopoietic progenitor self-renewal, and fail to induce leukemia in a murine transplantation model.\",\n      \"method\": \"Mutagenesis, biophysical analysis (structural/energetic), DNA binding assay, gene expression analysis, murine transplantation model, hematopoietic differentiation assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — combined biophysical/structural analysis with mutagenesis and multiple in vitro and in vivo functional assays\",\n      \"pmids\": [\"20430957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The solution structure of the AML1-ETO NHR3 domain in complex with PKA RIIalpha was determined by NMR. A key mutation abolishing PKA RIIalpha binding does not disrupt AML1-ETO's ability to enhance clonogenic capacity, repress proliferation or differentiation, or induce leukemia in vivo, indicating the NHR3-PKA RIIalpha interaction does not significantly contribute to AML1-ETO leukemogenesis.\",\n      \"method\": \"NMR structure determination, structure-guided mutagenesis, primary bone marrow clonogenic assay, in vivo leukemia model\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure plus mutagenesis validated in vivo; negative mechanistic result rigorously established\",\n      \"pmids\": [\"20708017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RUNX1/AML1 DNA-binding domain and the ETO NHR2-dimerization domain are critical for AML1-ETO9a-induced leukemia in mice; the NHR1 domain is not required. A region between NHR1 and NHR2 influences leukemia latency.\",\n      \"method\": \"Domain deletion/mutation mutants, murine bone marrow transduction and transplantation model, leukemia latency analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain mapping in definitive in vivo leukemia model with multiple mutants\",\n      \"pmids\": [\"19036704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AML1/ETO and HIF1alpha form a positive regulatory circuit and cooperate to transactivate the DNMT3a gene promoter, leading to DNA hypermethylation. Pharmacological or genetic disruption of the AML1/ETO-HIF1alpha loop causes DNA hypomethylation and re-expression of the hypermethylated tumor suppressor p15(INK4b).\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation, promoter reporter assays, siRNA knockdown, xenograft mouse model\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus ChIP plus functional reporter, single lab, multiple methods\",\n      \"pmids\": [\"25727291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The E3 ubiquitin ligase STUB1 binds to RUNX1 and RUNX1-RUNX1T1, induces their ubiquitination and proteasomal degradation, and promotes nuclear export of RUNX1. STUB1 overexpression shows substantial growth-inhibitory effect specifically in RUNX1-RUNX1T1-expressing myeloid leukemia cells.\",\n      \"method\": \"High-throughput binding assay, co-immunoprecipitation, ubiquitination assay, immunofluorescence, cell viability assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, and localization study in single lab with multiple methods\",\n      \"pmids\": [\"28536267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RUNX1/ETO cooperates with AP-1 to drive CCND2 (Cyclin D2) expression, maintaining leukemic cell cycle progression. Knockdown or pharmacological inhibition of CCND2 significantly impairs leukemic expansion and engraftment of patient-derived AML cells.\",\n      \"method\": \"RNAi screen guided by epigenomic profiling, ChIP-seq, siRNA knockdown, pharmacological inhibition, patient-derived xenograft model\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide binding data plus functional validation in patient-derived cells and in vivo model, multiple orthogonal methods\",\n      \"pmids\": [\"30300583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TAF1 associates with K43-acetylated AML1-ETO. TAF1 binding sites significantly overlap with AML1-ETO binding sites genome-wide. TAF1 knockdown alters AML1-ETO chromatin association and expression of both activated and repressed AML1-ETO target genes. TAF1 is required for leukemic cell self-renewal, and its reduction promotes differentiation and apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-sequencing, siRNA knockdown, self-renewal assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus ChIP-seq plus loss-of-function; single lab\",\n      \"pmids\": [\"31664040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EZH1 WD domain binds to the AML1-ETO NHR1 domain and methylates AML1-ETO at lysine 43 (Lys43) via its SET domain. This methylation augments AML1-ETO-dependent repression of tumor suppressor genes. Loss of Lys43 methylation by point mutation or domain deletion impairs AML1-ETO repressive activity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro methylation assay, point mutation analysis, ChIP, reporter gene assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro methylation assay plus mutagenesis plus ChIP plus functional reporter; multiple orthogonal methods identifying a specific PTM\",\n      \"pmids\": [\"31699991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Rapid degradation of AML1-ETO using an inducible degron system, combined with CUT&RUN and nascent transcript analysis, identifies a small core transcriptional circuit directly regulated by AML1-ETO. Derepression of this network upon AML1-ETO removal is associated with RUNX1 DNA binding and triggers a transcription cascade leading to myeloid differentiation.\",\n      \"method\": \"Inducible protein degradation, CUT&RUN chromatin binding assay, nascent transcript analysis (TT-seq or equivalent)\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rapid inducible loss-of-function with genome-wide direct target identification using multiple cutting-edge orthogonal approaches\",\n      \"pmids\": [\"33382982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MTG8 (RUNX1T1) and MTG16 are highly expressed in +4/5 early intestinal progenitors. Their expression is repressed by Notch signaling via ATOH1. Knockout of MTG8 or MTG16 in mice causes crypt hyperproliferation, expansion of intestinal stem cells, and impaired enterocyte differentiation. ChIP-seq shows MTG16 directly binds and represses promoters of intestinal stem cell genes (Lgr5, Ascl2) and ATOH1-regulated enhancers.\",\n      \"method\": \"Mouse knockout, intestinal organoids, ChIP-seq, RNA-seq, histology, immunohistochemistry\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with ChIP-seq and RNA-seq and multiple functional readouts; highly mechanistic study\",\n      \"pmids\": [\"32553763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RUNX1/RUNX1T1 regulates alternative RNA splicing in leukemic cells through two principal mechanisms: (i) regulation of alternative transcription start site selection affecting 5'-UTR structure, and (ii) control of splicing factor gene expression, generating alternative transcripts with new internal junctions.\",\n      \"method\": \"RNA-seq, transcriptome analysis, siRNA knockdown of RUNX1/RUNX1T1\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — comprehensive transcriptomic analysis with loss-of-function, single lab\",\n      \"pmids\": [\"33483506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PLCG1 is induced by AML1-ETO binding to intergenic regulatory DNA elements. Genetic inactivation of PLCG1 in murine and human AML inhibits AML1-ETO-dependent self-renewal programs, leukemic proliferation, and leukemia maintenance in vivo, while PLCG1 is dispensable for normal hematopoietic stem and progenitor cell function.\",\n      \"method\": \"Proteomics, ChIP-seq (AE binding to PLCG1 locus), genetic inactivation (murine and human), in vivo leukemia model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq plus genetic loss-of-function in both murine and human cells plus in vivo validation; multiple orthogonal approaches\",\n      \"pmids\": [\"34695195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"AML1-ETO decreases interactions between ETO-2/MTG16 and N-CoR. The MYND domain of AML1-ETO competitively occupies the ETO-2 binding site on N-CoR. Expression of the MYND domain alone in 32Dcl3 and human CD34+ cells prevents granulocyte but not macrophage differentiation, recapitulating a key effect of AML1-ETO.\",\n      \"method\": \"Co-immunoprecipitation, ectopic expression of MYND domain, hematopoietic differentiation assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional differentiation assay with domain-specific construct, single lab\",\n      \"pmids\": [\"15231665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The ETO-family co-repressor MTGR1 mediates Prdm14 repressive function in embryonic stem cells and primordial germ cell formation. MTGR1 tightly binds to the pre-SET/SET domains of Prdm14 and co-occupies its genomic targets. Crystal structure of the Prdm14-Mtgr1 complex was determined. Structure-guided point mutants and a monobody inhibitor of the Prdm14-Mtgr1 interaction abrogate Prdm14 function in mESC gene expression and PGC formation.\",\n      \"method\": \"Crystal structure determination, co-immunoprecipitation, ChIP-seq, structure-guided mutagenesis, synthetic monobody inhibitor, ESC differentiation assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus ChIP-seq plus functional cellular rescue experiments; multiple orthogonal methods in one study\",\n      \"pmids\": [\"26523391\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RUNX1T1 (ETO/MTG8) is a transcriptional co-repressor that functions by recruiting histone deacetylase complexes (via N-CoR/SMRT/Sin3A) to DNA-bound transcription factors; its NHR2 domain drives obligatory oligomerization required for high-affinity corepressor interaction, its NHR3 domain interacts with PKA RIIα, its NHR4/MYND domain binds corepressors, and its eTAFH domain interacts with E proteins. When fused to RUNX1 in t(8;21) AML, the resulting AML1-ETO fusion protein dominantly represses RUNX1 target genes (including CEBPA, c-FMS, IL-3, and PLCG1), silences E protein function via aberrant cofactor exchange, recruits DNMT1 to impose DNA methylation, undergoes activating methylation at Lys43 by EZH1 and ubiquitination/degradation by STUB1, cooperates with AP-1 to drive CCND2-dependent cell cycle progression, and blocks myeloid differentiation while enhancing hematopoietic stem cell self-renewal. In normal physiology, MTG8 is essential for gut morphogenesis, inhibits C/EBPβ during early adipogenesis, represses Notch target genes through the RBP-Jκ/SHARP complex, and (as MTGR1) mediates Prdm14-dependent repression in embryonic stem cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RUNX1T1 (ETO/MTG8) is a nuclear-matrix-associated transcriptional co-repressor that represses target genes by recruiting histone deacetylase complexes to DNA-bound transcription factors [#2, #13]. It assembles with N-CoR/SMRT/Sin3A/HDAC corepressor machinery and serves as an obligate corepressor for sequence-specific factors including PLZF, Gfi-1/Gfi-1B, Bcl-6, and the RBP-Jκ/SHARP Notch complex, in each case enforcing HDAC-dependent silencing [#13, #14, #16, #22]. High-affinity corepressor engagement depends on self-association through the NHR2 domain, which drives a dimer-to-tetramer transition required for SMRT/N-CoR binding and repression, while the MYND domain competes for the N-CoR binding site, the NHR3 domain binds PKA RIIα, and the eTAFH domain captures the AD1 motif of E proteins (E2A, HEB) [#8, #17, #38, #26]. In physiology, RUNX1T1 is essential for gastrointestinal development, restrains intestinal stem cell genes (Lgr5, Ascl2) and ATOH1 enhancers downstream of Notch, and inhibits C/EBPβ during early adipogenesis [#10, #35, #19]; the family member MTGR1 mediates Prdm14-dependent repression in embryonic stem cells and germ-cell formation [#39]. The t(8;21) translocation fuses the RUNX1 runt domain to most of RUNX1T1, producing AML1-ETO, which acts as a dominant repressor of RUNX1 target genes and blocks fetal liver hematopoiesis in vivo [#0, #3]. AML1-ETO requires CBFβ heterodimerization and NHR2-mediated oligomerization to block myeloid differentiation and enhance stem/progenitor self-renewal [#25, #26, #12, #21], silences CEBPA and E-protein function, redirects hematopoietic fate by suppressing scl, recruits DNMT1/DNMT3a to impose DNA hypermethylation, and is regulated by Lys43 methylation via EZH1, by TAF1 binding to acetylated Lys43, and by STUB1-mediated ubiquitin-degradation [#11, #17, #23, #20, #29, #33, #32, #30]. It drives leukemic proliferation through AP-1/CCND2 and PLCG1 programs, and rapid degradation of AML1-ETO derepresses a core circuit that triggers RUNX1-dependent myeloid differentiation [#31, #37, #34].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Defining the molecular lesion of t(8;21) AML by cloning the fusion gene established that a novel chromosome-8 gene, MTG8/ETO, is recurrently joined to AML1.\",\n      \"evidence\": \"RT-PCR, cDNA cloning, and Northern blot across t(8;21) patients and cell lines\",\n      \"pmids\": [\"8334990\", \"8353289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the biochemical function of the fusion or wild-type ETO\", \"No mechanism for how the fusion alters transcription\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Characterizing endogenous ETO showed it is a nuclear-matrix phosphoprotein expressed in normal CD34+ progenitors, indicating a physiological role beyond the leukemic fusion.\",\n      \"evidence\": \"32P-labeling immunoprecipitation, immunofluorescence, and subcellular fractionation in hematopoietic cells\",\n      \"pmids\": [\"8781439\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Function of nuclear-matrix localization unresolved\", \"No transcriptional targets identified\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"An AML1-ETO knock-in mouse demonstrated the fusion is a dominant inhibitor of normal AML1 function in vivo, phenocopying AML1/CBFβ loss.\",\n      \"evidence\": \"Gene-targeted knock-in mouse and fetal liver colony-forming assays\",\n      \"pmids\": [\"9054947\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Embryonic lethality precluded analysis of leukemogenesis\", \"Did not identify the repression mechanism\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identifying ETO as a corepressor and mapping NHR2-driven oligomerization established the core biochemical mechanism: self-association is required for high-affinity N-CoR/SMRT binding and for blocking differentiation.\",\n      \"evidence\": \"Co-IP, in vitro reconstitution, reporter repression, and differentiation assays with deletion/fusion mutants; parallel knockout and PKA-binding studies\",\n      \"pmids\": [\"11113190\", \"9447981\", \"11593431\", \"11463846\", \"12480707\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the oligomer not yet resolved at this stage\", \"Endogenous target genes not yet mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Cataloguing the corepressor partners (PLZF, Gfi-1/Gfi-1B, Bcl-6) and demonstrating ChIP occupancy at endogenous targets (c-FMS) established ETO as a general HDAC-recruiting corepressor for sequence-specific factors.\",\n      \"evidence\": \"Co-IP, immunofluorescence co-localization, ChIP, and HDAC-dependent reporter assays\",\n      \"pmids\": [\"12559562\", \"12874834\", \"14551142\", \"12773394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity rules for partner recruitment unclear\", \"Relative contribution of each partner to leukemia not weighted\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapping the eTAFH–E-protein and MYND–N-CoR interfaces revealed how AML1-ETO silences E proteins and rewires corepressor competition, and showed the NHR3-NHR4 region restrains full leukemogenic potential.\",\n      \"evidence\": \"Co-IP, mass spectrometry, domain mapping, and in vivo leukemia models with truncation mutants\",\n      \"pmids\": [\"15333839\", \"15231665\", \"15569932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the C-terminal restraint is relieved in patients unclear\", \"Relative weighting of each interface for transformation not yet resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linking RUNX1/MTG8 to DNMT1 recruitment at the IL-3 promoter connected the corepressor to heritable DNA methylation, broadening its silencing mechanism beyond histone deacetylation.\",\n      \"evidence\": \"ChIP on AML blasts, co-IP, and co-expression repression assays\",\n      \"pmids\": [\"15735013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide extent of methylation targeting not defined here\", \"Direct vs. indirect DNMT recruitment not distinguished\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"In vivo zebrafish, Notch-pathway, and domain-mapping studies showed AML1-ETO redirects hematopoietic fate by suppressing scl, disrupts ETO's normal RBP-Jκ/SHARP repression, and requires the RUNX1 DNA-binding and NHR2 domains for leukemia.\",\n      \"evidence\": \"Inducible transgenic zebrafish with scl rescue, co-IP/ChIP at Notch targets, and murine domain-deletion leukemia models\",\n      \"pmids\": [\"18156164\", \"18332109\", \"19036704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of cofactor exchange at Notch targets not fully reconstituted\", \"How fate redirection integrates with self-renewal unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Structure-guided dissection of individual interaction surfaces (eTAFH–HEB, CBFβ heterodimerization) parsed which contacts actually drive transformation, finding the E-protein contact dispensable but CBFβ binding essential.\",\n      \"evidence\": \"NMR structures, structure-guided mutagenesis, primary bone marrow clonogenic assays, and murine leukemia models\",\n      \"pmids\": [\"19204326\", \"19179469\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why CBFβ is required despite the runt-fusion context not fully explained\", \"Compensating activities of other domains not quantified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Biophysical and structural analysis resolved that NHR2 dimer-to-tetramer assembly, not the NHR3-PKA contact, is the obligate oligomerization step for DNA binding, gene regulation, and leukemia.\",\n      \"evidence\": \"Biophysical/energetic analysis, interface mutagenesis, DNA-binding and gene-expression assays, and murine transplantation; NMR of the NHR3-PKA RIIα complex with functional mutants\",\n      \"pmids\": [\"20430957\", \"20708017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Druggability of the tetramer interface in vivo not established\", \"How tetramerization templates target-gene selection unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying the AML1/ETO–HIF1α loop driving DNMT3a expansion clarified how the fusion enforces tumor-suppressor hypermethylation as a maintainable circuit.\",\n      \"evidence\": \"Co-IP, ChIP, promoter reporters, siRNA knockdown, and xenograft models; structural/mechanistic work on MTGR1-Prdm14 in ESCs\",\n      \"pmids\": [\"25727291\", \"26523391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. cooperative DNMT3a transactivation not fully separated\", \"Generality of the HIF1α circuit across patients untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovery of EZH1-mediated Lys43 methylation and TAF1 binding to acetylated Lys43 established post-translational modification of the fusion as a tunable switch for its repressive activity and chromatin association.\",\n      \"evidence\": \"In vitro methylation assays, co-IP, ChIP/ChIP-seq, point mutagenesis, and self-renewal assays\",\n      \"pmids\": [\"31699991\", \"31664040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay between K43 methylation and acetylation not resolved\", \"Upstream signals controlling these PTMs unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defining the normal intestinal role and using rapid degron-based AML1-ETO removal connected the corepressor's physiological stem-cell restraint to its leukemic block, showing fusion loss triggers RUNX1-dependent differentiation.\",\n      \"evidence\": \"Mouse knockouts, organoids, CUT&RUN/ChIP-seq, and inducible degron with nascent transcript analysis\",\n      \"pmids\": [\"32553763\", \"33382982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct primary targets of wild-type RUNX1T1 in hematopoiesis incompletely mapped\", \"Kinetics of corepressor reassembly after differentiation unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Functional genomics nominated AP-1/CCND2 and PLCG1 as leukemia-specific effector programs of AML1-ETO, distinguishing oncogenic dependencies from normal HSPC requirements.\",\n      \"evidence\": \"ChIP-seq, RNAi/pharmacological inhibition, genetic inactivation in murine and human AML, and patient-derived xenografts; transcriptome-wide splicing analysis\",\n      \"pmids\": [\"30300583\", \"34695195\", \"33483506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How splicing regulation integrates with the transcriptional program unclear\", \"Therapeutic window of these dependencies in patients untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RUNX1T1 oligomerization, partner selectivity, and the layered DNA/histone-methylation and PTM controls integrate to specify target-gene choice in normal versus leukemic cells remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified model linking tetramer assembly to genome-wide target specificity\", \"Druggable interface or PTM node for clinical intervention not validated\", \"Full physiological target set of wild-type RUNX1T1 across tissues incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [13, 16, 22, 35]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8, 13, 16, 22, 38]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [15, 26, 35]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [13, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [2, 6, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [13, 16, 22, 34]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 3, 31, 37]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [15, 20, 29, 33]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [10, 35, 39]}\n    ],\n    \"complexes\": [\n      \"N-CoR/SMRT-Sin3A-HDAC corepressor complex\",\n      \"RBP-Jκ/SHARP Notch corepressor complex\",\n      \"AML1-ETO fusion oligomer (t(8;21))\"\n    ],\n    \"partners\": [\n      \"RUNX1\",\n      \"CBFB\",\n      \"NCOR1\",\n      \"SMRT\",\n      \"MTGR1\",\n      \"BCL6\",\n      \"DNMT1\",\n      \"EZH1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}