{"gene":"MECOM","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1996,"finding":"MDS1 exists as both an independent transcript and as a fusion transcript with EVI1 (MDS1/EVI1) in normal tissues, producing a protein with ~40% amino acid homology to the PR domain of the RIZ retinoblastoma-interacting zinc-finger protein at the N-terminus of EVI1.","method":"RT-PCR, sequence analysis, intergenic splicing characterization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct molecular characterization of transcript and protein structure, replicated across multiple tissues, foundational structural finding","pmids":["8643684"],"is_preprint":false},{"year":1997,"finding":"MDS1/EVI1 is a strong transcriptional activator of promoters containing the AGATA (GATA-binding) motif, whereas EVI1 (the shorter isoform lacking the PR/MDS1 N-terminus) is a transcriptional repressor; EVI1 represses GATA-1-driven activation while MDS1/EVI1 does not; the activating function of MDS1/EVI1 maps to an acidic segment encoded by exons 2–3 in the 5' region.","method":"Reporter gene (luciferase) assays, Gal4 DNA-binding domain fusion constructs, comparative expression analysis","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro transcriptional assays with domain-mapping, multiple orthogonal reporter constructs, replicated in independent work","pmids":["9067573"],"is_preprint":false},{"year":1999,"finding":"EVI1 physically interacts with SMAD3 (an intracellular TGF-β signaling mediator) via a yeast two-hybrid assay; MDS1/EVI1 enhances TGF-β1-mediated growth inhibition whereas the leukemic fusion AML1/MDS1/EVI1 abrogates it; MDS1/EVI1 has no effect on G-CSF-induced granulocytic differentiation but AML1/MDS1/EVI1 blocks differentiation.","method":"Yeast two-hybrid, cell-line functional assays (32Dcl3), reporter gene assays","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid plus multiple cellular functional readouts, findings on EVI1-SMAD3 interaction replicated by independent labs","pmids":["10086725"],"is_preprint":false},{"year":2001,"finding":"EVI1 represses TGF-β signaling by physically interacting with SMAD3 through its first zinc-finger domain, suppressing SMAD3 transcriptional activity; EVI1 also recruits CtBP as a corepressor through a CtBP-binding motif (amino acids 544–607), and histone deacetylase (HDAC) inhibitor TSA alleviates EVI1-mediated TGF-β repression.","method":"Co-immunoprecipitation, reporter gene assays, domain-deletion analysis, pharmacological HDAC inhibition","journal":"Cancer chemotherapy and pharmacology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction assays with domain mapping, multiple orthogonal methods, findings replicated across studies","pmids":["11587364"],"is_preprint":false},{"year":2001,"finding":"Both EVI1 and MDS1/EVI1 repress transcription from reporter constructs containing EVI1 binding sites and both physically interact with histone deacetylase (HDAC) in mammalian cells; this interaction can be recapitulated in vitro and is mediated by a previously characterized repression domain whose activity is alleviated by TSA.","method":"Reporter gene assays, co-immunoprecipitation (in vivo and in vitro), HDAC inhibitor (TSA)","journal":"British journal of haematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro interaction data, single lab, two orthogonal methods","pmids":["11552981"],"is_preprint":false},{"year":2002,"finding":"The leukemic fusion protein AML1/MDS1/EVI1 (AME) physically interacts in vivo with CtBP1 and HDAC1 through distinct regions of AME; AME represses gene transcription by both CtBP1-dependent and CtBP1-independent mechanisms; the AME–CtBP1 interaction is required for growth upregulation and abnormal differentiation of murine hematopoietic precursor 32Dcl3 cells and bone marrow progenitors.","method":"Co-immunoprecipitation, reporter gene assays, domain-deletion analysis, cell functional assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP in vivo, multiple domain-deletion reporter assays, functional validation in primary cells","pmids":["12082639"],"is_preprint":false},{"year":2004,"finding":"The leukemic fusion protein AML1/MDS1/EVI1 (AME) suppresses CEBPA protein and DNA-binding activity (~90%) without changing CEBPA mRNA levels; AME strongly activates calreticulin (CRT), which inhibits CEBPA translation; siRNA knockdown of CRT restores CEBPA protein levels in AME-expressing cells.","method":"Conditional expression system, western blot, EMSA, siRNA knockdown, quantitative RT-PCR","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods in cell line and patient samples, siRNA rescue experiment confirming mechanism","pmids":["15326310"],"is_preprint":false},{"year":2007,"finding":"EVI1 represses RUNX1 (AML1) function: the 8th zinc finger motif of EVI1/MDS1/EVI1 is an oligomerization domain that interacts with RUNX1 in vitro, altering RUNX1's DNA-binding ability and reporter gene regulation; in vivo, expression of the isolated 8th zinc finger motif of EVI1 blocks G-CSF-induced granulocytic differentiation of 32Dcl3 cells, leading to cell death.","method":"In vitro binding assay, reporter gene assay, cell functional assay (32Dcl3 differentiation model)","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro interaction plus in vivo functional phenotype, single lab","pmids":["17575132"],"is_preprint":false},{"year":2011,"finding":"EVI1 directly represses PTEN transcription in murine bone marrow, leading to activation of AKT/mTOR signaling; EVI1 binds to polycomb group proteins and recruits polycomb repressive complexes to the PTEN locus for its down-regulation; this mechanism is recapitulated in human leukemic cells.","method":"ChIP assay, co-immunoprecipitation, murine bone marrow transplantation model, rapamycin sensitivity assay, human patient sample validation","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP confirms direct binding, co-IP confirms polycomb interaction, functional validation in mouse model and human samples","pmids":["21289308"],"is_preprint":false},{"year":2011,"finding":"PR-domain-containing Mds1-Evi1 (ME) is exclusively expressed in hematopoietic stem cells (HSCs); ME deficiency reduces HSC number and completely eliminates long-term repopulation capacity while shifting the stem cell compartment from quiescence to active cycling; ME preferentially rescues long-term HSC defects relative to EVI1; ME regulates p57-Kip2 (Cdkn1c) expression and reintroduction of ME normalizes p57-Kip2 expression and growth control.","method":"lacZ knock-in mouse model, bone marrow transplantation, RNA-seq in Lin-Sca-1+c-Kit+ cells, retroviral reintroduction rescue experiments","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic mouse model with multiple orthogonal readouts, rescue experiment, mechanistic target identified","pmids":["21666053"],"is_preprint":false},{"year":2012,"finding":"Prdm3 (MECOM/MDS1-EVI1) and Prdm16 act as redundant H3K9me1-specific histone methyltransferases (KMTs) that direct cytoplasmic H3K9me1 methylation; simultaneous depletion of Prdm3 and Prdm16 abolishes H3K9me1 methylation, prevents Suv39h-dependent H3K9me3 trimethylation, derepresses major satellite transcription, and causes disintegration of heterochromatic foci and disruption of the nuclear lamina.","method":"Biochemical in vitro methyltransferase assay, in vivo mouse embryonic fibroblast analyses, DNA-FISH, electron microscopy, siRNA depletion","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay plus multiple orthogonal in vivo methods, replicated across organisms","pmids":["22939622"],"is_preprint":false},{"year":2012,"finding":"EVI1 activation in hematopoietic progenitor cells causes biphasic effects: initial growth inhibition with retarded myeloid differentiation and dose-dependent G0/G1 cell cycle arrest; EVI1 upregulates stemness genes (Aldh1a1, Abca1, Cdkn1b, Cdkn1c) and downregulates genes for DNA replication (cyclins) and DNA repair (Brca1, Brca2, Rad51) within 24 hours.","method":"Inducible lentiviral expression, gene expression microarray, cell cycle analysis","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inducible system with dose-response, microarray mechanistic target identification, single lab","pmids":["23212151"],"is_preprint":false},{"year":2013,"finding":"EVI1 upregulates KRAS expression in pancreatic cancer cells by suppressing miR-96, a potent KRAS suppressor; EVI1 depletion causes inhibition of cell growth and migration.","method":"shRNA knockdown, miRNA target validation, cell proliferation/migration assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional knockdown with mechanistic miRNA target identification, single lab","pmids":["23752186"],"is_preprint":false},{"year":2013,"finding":"In zebrafish, mecom is necessary for distal tubule formation and restricts proximal tubule formation and multiciliated cell (MCC) fate choice during nephron development; mecom acts upstream of Notch signaling to promote it (ectopic NICD rescues MCC expansion in mecom morphants); retinoic acid (RA) and mecom have opposing roles in proximal-distal segment patterning, with RA inhibiting mecom.","method":"Morpholino knockdown, genetic epistasis (DAPT/γ-secretase inhibitor, NICD overexpression rescue), zebrafish developmental phenotype analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with rescue experiment, multiple pathway interactions tested, clear cellular phenotype","pmids":["24309209"],"is_preprint":false},{"year":2013,"finding":"The PR domain of MDS1-EVI1 (ME isoform) is essential for MLL-AF9-induced leukemic transformation in vitro and in vivo; ME is specifically required for MLL-AF9 and MLL-ENL leukemia but not for Nup98-HOXA9, MEIS1-HOXA9, or E2A-Hlf transformation; the PR domain histone methyltransferase activity is required for this function.","method":"ME-deficient mouse model, in vitro transformation assays, bone marrow transplantation, retroviral transduction with PR-domain mutants","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic mouse model with specific oncogene panel epistasis test, domain-function mutant analysis","pmids":["24021671"],"is_preprint":false},{"year":2011,"finding":"EVI1 directly represses MIR449A via promoter occupation; MIR449A targets NOTCH1 and BCL2; the EVI1-MIR449A-NOTCH1/BCL2 regulatory axis contributes to survival of MECOM-rearranged leukemic cells.","method":"ChIP (chromatin immunoprecipitation), miRNA expression profiling, knockdown/re-expression models, apoptosis assays","journal":"British journal of haematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms direct promoter binding, functional rescue experiment with miRNA re-expression, single lab","pmids":["21569010"],"is_preprint":false},{"year":2011,"finding":"Targeting EVI1's first zinc finger domain (ZF1) DNA-binding site with a synthetic pyrrole-imidazole polyamide blocks EVI1 binding to the GACAAGATA motif; structure-function studies showed that ZF1-mediated DNA binding to GACAAGATA is essential for EVI1 transforming activity.","method":"DNase I footprinting, EMSA, in vivo CAT reporter assay, colony formation assay, structure-function mutagenesis","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding assay (footprinting + EMSA), in vivo reporter assay, domain mutagenesis, functional inhibition in leukemic cell line","pmids":["22039883"],"is_preprint":false},{"year":2015,"finding":"EVI1 directly represses MS4A3 transcription by binding to a proximal promoter region; experimental re-expression of MS4A3 in EVI1-overexpressing cells counteracts EVI1-promoted tumor growth by increasing apoptosis in a xenograft model.","method":"Reporter gene assay (luciferase), ChIP, qRT-PCR, xenograft tumor model","journal":"Journal of hematology & oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms direct binding, reporter gene assay confirms regulatory function, in vivo rescue validation, single lab","pmids":["25886616"],"is_preprint":false},{"year":2017,"finding":"EVI1 overexpression promotes CKMT1 expression by repressing the myeloid differentiation regulator RUNX1; CKMT1-dependent arginine-creatine metabolism (ATP buffering via mitochondrial creatine kinase) is required for survival of EVI1-positive AML cells; CKMT1 inhibition alters mitochondrial respiration and ATP production, and phosphocreatine reactivation of the arginine-creatine pathway abrogates these effects.","method":"shRNA screen, transcriptomic and metabolomic profiling, CKMT1 shRNA knockdown, small molecule (cyclocreatine) treatment, xenograft models, primary AML mouse models, metabolic flux analysis","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — pooled shRNA screen followed by mechanistic validation with multiple orthogonal methods, in vivo rescue, metabolic rescue experiment","pmids":["28191887"],"is_preprint":false},{"year":2017,"finding":"RUNX1-EVI1 (from t(3;21)) directs a stem cell-like transcriptional network reliant on GATA2 and displays distinct chromatin binding patterns and gene expression programs compared to RUNX1-ETO despite sharing the same RUNX1 DNA-binding domain; both AML types are dependent on continuous expression of their respective fusion proteins.","method":"ChIP-seq, ATAC-seq, RNA-seq, transcription factor dependency assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide chromatin and expression profiling, single lab, functional dependency validated","pmids":["28538183"],"is_preprint":false},{"year":2019,"finding":"PRDM3 (MDS1-EVI1) directly interacts with the NuRD chromatin remodeling complex specifically through its N-terminal PR-SET domain residues, primarily via RBBP4; this interaction is isoform-specific (absent in EVI1/ΔPR isoform); RBBP4 binds to N-terminal amino acid residues of PRDM3 within the conserved histone H3-binding groove, as determined by X-ray crystal structures.","method":"Proteomics (interactome comparison of full-length vs. ΔPR isoforms), isothermal titration calorimetry (Kd = 3.0 μM), X-ray crystallography of PRDM3 N-terminal peptide/RBBP4 complex","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — X-ray crystal structure plus ITC quantitative binding measurement plus proteomics, multiple orthogonal methods in a single study","pmids":["30462309"],"is_preprint":false},{"year":2021,"finding":"MECOM (MDS1-EVI1/PRDM3) forms a protein complex with the transcription factor PAX8; PRDM3 interaction with PAX8 was mapped in vitro and in vivo; together PAX8 and PRDM3 regulate a specific gene expression module involved in adhesion and extracellular matrix at a subset of PAX8 genomic binding sites; the MECOM locus and PAX8 sustain in vivo tumor growth in ovarian cancer.","method":"Co-immunoprecipitation, in vitro and in vivo interaction mapping, ChIP-seq, transcriptomics, xenograft in vivo tumor model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP in vivo and in vitro, ChIP-seq genome-wide binding, in vivo functional validation","pmids":["33903593"],"is_preprint":false},{"year":2021,"finding":"MECOM depletion impairs human endothelial cell differentiation and function and zebrafish angiogenesis; MECOM binds enhancers that form chromatin loops to regulate endothelial cell identity genes; the VEGF signaling pathway is a key transcriptional target of MECOM in endothelial cells.","method":"MECOM siRNA knockdown, single-cell RNA-seq, Hi-C, DNase-seq, ChIP-seq, RNA-seq, zebrafish angiogenesis assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with specific phenotype, integrative multi-omics (Hi-C, ChIP-seq, DNase-seq) in single study","pmids":["37185814"],"is_preprint":false},{"year":2022,"finding":"Oncogenic SF3B1 mutations generate a novel in-frame EVI1 splice isoform containing a 6-amino acid insertion at the 3' end of the second zinc finger domain; this isoform enhances hematopoietic stem cell self-renewal and accelerates leukemogenesis in vivo; the mutant SF3B1 spliceosome uses an exonic splicing enhancer within EVI1 exon 13 to drive usage of a cryptic branch point and aberrant 3' splice site within intron 12.","method":"RNA splicing analysis, in vivo mouse leukemogenesis model (humanized inv(3) allele + mutant Sf3b1), HSC self-renewal assays, molecular characterization of splice site usage","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic mouse model, precise molecular mechanism of splice site usage defined, functional self-renewal assay","pmids":["35709354"],"is_preprint":false},{"year":2023,"finding":"EVI1 drives leukemogenesis primarily through direct transcriptional activation of the ETS transcription factor ERG; EVI1 occupies a conserved intragenic enhancer region of ERG in AML cell lines and primary AML; suppression of ERG induces terminal differentiation of EVI1-driven AML cells, whereas ectopic ERG expression abrogates dependence on EVI1.","method":"CRISPR genome-wide screens, ChIP-seq, RNA-seq, inducible EVI1 withdrawal models, ERG knockdown/overexpression epistasis in vitro and in vivo","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide CRISPR screens with targeted mechanistic follow-up, ChIP-seq confirming direct binding, epistasis rescue experiment in human and murine models","pmids":["36095844"],"is_preprint":false},{"year":2024,"finding":"EVI1 interaction with CTBP1 and CTBP2 via a single PLDLS motif is indispensable for leukemic transformation; a 4× PLDLS repeat decoy construct outcompetes EVI1 binding to CTBP1/CTBP2 and inhibits proliferation of 3q26/MECOM-rearranged AML in vitro and in xenotransplant models.","method":"Protein folding predictions, proteomics, co-immunoprecipitation, PLDLS-decoy peptide competition assay, in vitro proliferation assay, xenotransplant mouse model","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein interaction confirmed by proteomics and co-IP, functional rescue with competitive inhibitor in vitro and in vivo","pmids":["38748792"],"is_preprint":false},{"year":2006,"finding":"Arsenic trioxide (ATO) degrades the AML1/MDS1/EVI1 (AME) fusion protein via the ubiquitin-proteasome pathway (for EVI1 moiety) and in a proteasome-independent manner (for MDS1 moiety); ATO treatment induces differentiation and apoptosis in AME leukemic cells in vitro and reduces tumor load in vivo.","method":"Western blot protein degradation assay, proteasome inhibitor experiments, cell differentiation/apoptosis assays, mouse transplant model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteasome inhibitor experiment identifies degradation pathway, functional validation in cells and mice, single lab","pmids":["17145882"],"is_preprint":false},{"year":2024,"finding":"Combined deletion of Prdm3 and Prdm16 in lung endoderm causes perinatal lethality due to respiratory failure with loss of AT2 cells and accumulation of partially differentiated AT1 cells; PRDM3 and PRDM16 regulate chromatin accessibility at NKX2-1 transcriptional targets critical for AT2 cell differentiation; lineage-specific deletion in AT2 cells causes lineage infidelity with partial AT1 fate acquisition.","method":"Conditional knockout mouse models (single-cell RNA-seq, bulk ATAC-seq, CUT&RUN), lung morphological and functional phenotyping","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic mouse models with multiple orthogonal epigenomic assays, clear mechanistic link between PRDM3/16 and chromatin accessibility at NKX2-1 targets","pmids":["39284798"],"is_preprint":false},{"year":2017,"finding":"EVI1 isoforms (EVI1-145kDa, EVI1-Δ324, MDS1-EVI1) regulate EVI1's own transcription through distinct promoter regions: EVI1-145kDa activates EVI1 transcription (autoactivation), whereas EVI1-Δ324 and MDS1-EVI1 act as repressors of EVI1 transcription; EVI1-145kDa prolongs maintenance of hematopoietic stem and progenitor cells while MDS1-EVI1 represses colony replating capacity.","method":"Reporter gene assays (luciferase with EVI1 promoter regions), retroviral expression of isoforms, hematopoietic colony assays","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter gene assays with multiple promoter constructs, functional hematopoietic assays, single lab","pmids":["28391050"],"is_preprint":false},{"year":2013,"finding":"EVI1 splice variants in ovarian cancer (including Del190-515) bind CtBP1 and SMAD3 similar to wild-type EVI1, but localize preferentially to PML nuclear bodies; EVI1 wild-type and EVI1(Del427-515) (but not Del190-515) increase cyclin E1 LMW expression and promote cell cycle progression; knockdown of MDS1/EVI1 and EVI1(Del190-515) increases claudin-1 expression with reduction in cell migration.","method":"Co-immunoprecipitation, immunofluorescence localization, cell cycle analysis, western blot, knockdown experiments","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP binding confirmed, localization by immunofluorescence, functional knockdown with migratory phenotype, single lab","pmids":["23517670"],"is_preprint":false},{"year":2021,"finding":"MECOM (EVI1) expression in acinar cells during dedifferentiation is directly regulated by SOX9; MECOM deficiency in acinar cells impairs cell adhesion, increases acinar cell death, suppresses dedifferentiation, and limits ERK signaling; MECOM permits acinar cell survival under stress by enabling cellular dedifferentiation.","method":"Lineage tracing, RNA sequencing, genetic loss-of-function (mouse), SOX9 correlation and direct regulation assay, ERK pathway analysis","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic mouse model with specific phenotypic readout, direct SOX9 regulation established, ERK pathway link identified, single lab","pmids":["33762742"],"is_preprint":false},{"year":2019,"finding":"EVI1 overexpression in AML cells triggers metabolic reprogramming including acceleration of oxidative phosphorylation (OXPHOS) prior to glycolysis activation, with increased dependency on glutamine as an energy source; EVI1 drives production of TCA cycle metabolites; low ASNS expression in EVI1+ cells confers sensitivity to L-asparaginase.","method":"Extracellular flux analysis (XFp), mouse AML models (MLL-AF9/Evi1), metabolomics, cell viability assays, in vivo L-asparaginase treatment","journal":"Haematologica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — metabolic flux measurements in mouse model and patient samples, mechanistic rescue with L-asparaginase and glutamine, single lab","pmids":["31649131"],"is_preprint":false},{"year":2023,"finding":"EVI1 activates the ETS2 super-enhancer in colorectal cancer/IBD through binding to a disease-specific super-enhancer that physically contacts the ETS2 promoter; an IBD-risk SNP in the ETS2 super-enhancer modulates ETS2 expression by affecting MECOM binding; silencing MECOM significantly downregulates ETS2 in CRC cells.","method":"ChIP-seq, Hi-C, enhancer RNA analysis, reporter gene assays, MECOM knockdown, cell colony-formation and migration assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq direct binding evidence, Hi-C chromatin loop confirmation, functional knockdown experiments, single lab","pmids":["36609474"],"is_preprint":false}],"current_model":"MECOM encodes multiple protein isoforms from a single locus—most notably MDS1-EVI1 (PRDM3), which contains an N-terminal PR-SET domain with H3K9me1 histone methyltransferase activity, and the shorter EVI1, which lacks this domain. EVI1 functions as a transcriptional repressor that inhibits TGF-β/SMAD3 signaling (via direct SMAD3 interaction), represses PTEN to activate AKT/mTOR (by recruiting polycomb repressive complexes), represses GATA-binding and differentiation-linked promoters via CtBP/HDAC co-repressor recruitment (through a PLDLS motif essential for leukemic transformation), and directly activates the ERG transcription factor through an intragenic enhancer to drive leukemogenesis; MDS1-EVI1 (PRDM3) acts antagonistically as a GATA-motif transcriptional activator, methylates H3K9me1 to maintain heterochromatin integrity, interacts isoform-specifically with the NuRD chromatin remodeling complex via RBBP4, regulates hematopoietic stem cell quiescence through p57-Kip2 (Cdkn1c), and forms a functional complex with PAX8 to regulate adhesion/extracellular matrix gene expression in ovarian cancer."},"narrative":{"mechanistic_narrative":"MECOM encodes multiple protein isoforms from a single locus whose opposing activities govern transcriptional programs in hematopoietic stem cells, vascular endothelium, and epithelial development, and which are co-opted in leukemia and solid tumors [PMID:9067573, PMID:21666053, PMID:37185814]. The shorter EVI1 isoform is a zinc-finger transcriptional repressor: it binds the GACAAGATA/AGATA motif through its first zinc finger, a DNA-binding event essential for transforming activity [PMID:22039883], represses TGF-β signaling by physically engaging SMAD3 [PMID:11587364], and recruits CtBP and HDAC corepressors through a defined repression domain to silence target genes [PMID:11587364, PMID:11552981]. EVI1 directly represses PTEN by recruiting polycomb repressive complexes, thereby activating AKT/mTOR signaling [PMID:21289308], and silences differentiation- and apoptosis-linked targets including MS4A3, RUNX1, and the miR-449a/miR-96 axis [PMID:25886616, PMID:28191887, PMID:21569010, PMID:23752186]. In leukemic transformation EVI1 acts positively through direct activation of the ETS factor ERG via a conserved intragenic enhancer, with ERG re-expression bypassing EVI1 dependence [PMID:36095844], while its interaction with CTBP1/CTBP2 through a single PLDLS motif is indispensable for transformation and is a tractable therapeutic vulnerability [PMID:38748792]. The longer PR-domain isoform MDS1-EVI1 (PRDM3) behaves antagonistically as a GATA-motif transcriptional activator [PMID:9067573] and is an H3K9me1-specific histone methyltransferase that, redundantly with PRDM16, maintains heterochromatin integrity and the nuclear lamina [PMID:22939622]; through its PR-SET domain it engages the NuRD complex via RBBP4 in an isoform-specific manner [PMID:30462309]. PRDM3 maintains hematopoietic stem cell quiescence and long-term repopulation via p57-Kip2/Cdkn1c [PMID:21666053] and is specifically required for MLL-AF9-driven leukemia through its methyltransferase activity [PMID:24021671]. Beyond hematopoiesis, MECOM controls endothelial identity and angiogenesis through enhancer-mediated VEGF-pathway regulation [PMID:37185814], partners with PAX8 to drive adhesion/ECM programs in ovarian cancer [PMID:33903593], and with PRDM16 regulates NKX2-1-dependent alveolar epithelial differentiation [PMID:39284798].","teleology":[{"year":1996,"claim":"Established that the MECOM locus produces both an independent EVI1 transcript and an MDS1/EVI1 fusion transcript, the latter adding an N-terminal PR domain—defining the structural basis for two functionally distinct isoforms.","evidence":"RT-PCR and intergenic splicing characterization in normal tissues","pmids":["8643684"],"confidence":"High","gaps":["Did not define functional consequences of the PR domain","No enzymatic activity assigned to the PR domain at this stage"]},{"year":1997,"claim":"Demonstrated that the two isoforms are functionally opposed transcription factors—MDS1/EVI1 activates and EVI1 represses GATA-motif promoters—mapping the activating function to an acidic N-terminal segment.","evidence":"Luciferase reporter and Gal4-fusion assays with domain mapping","pmids":["9067573"],"confidence":"High","gaps":["Corepressor identity for EVI1 repression not yet defined","In vivo relevance to hematopoiesis untested"]},{"year":1999,"claim":"Linked EVI1 to TGF-β signaling by showing physical SMAD3 interaction and demonstrating opposite isoform effects on growth inhibition, connecting the protein to a major antiproliferative pathway.","evidence":"Yeast two-hybrid plus 32Dcl3 cell functional assays","pmids":["10086725"],"confidence":"High","gaps":["Domain mediating SMAD3 binding not yet mapped","Mechanism of transcriptional repression downstream of SMAD3 unresolved"]},{"year":2001,"claim":"Defined the repressive machinery of EVI1: SMAD3 binding via the first zinc finger plus CtBP and HDAC corepressor recruitment, explaining how EVI1 silences TGF-β and other targets.","evidence":"Co-immunoprecipitation, domain-deletion reporter assays, TSA inhibition (two studies)","pmids":["11587364","11552981"],"confidence":"High","gaps":["Genome-wide target repertoire unknown","Relative contribution of CtBP vs HDAC not dissected"]},{"year":2002,"claim":"Showed the leukemic AML1/MDS1/EVI1 fusion uses both CtBP1-dependent and -independent repression and that CtBP1 binding is required for aberrant growth and differentiation of progenitors, tying corepressor recruitment to transformation.","evidence":"Reciprocal co-IP, domain-deletion reporter assays, 32Dcl3 and bone marrow functional assays","pmids":["12082639"],"confidence":"High","gaps":["CtBP1-independent repression mechanism not defined","Direct target genes of the fusion not yet identified"]},{"year":2004,"claim":"Identified a translational-control axis whereby the AME fusion activates calreticulin to suppress CEBPA protein, revealing post-transcriptional disruption of a myeloid differentiation factor.","evidence":"Conditional expression, EMSA, siRNA rescue of CRT","pmids":["15326310"],"confidence":"High","gaps":["Whether full EVI1 (non-fusion) uses the same axis untested","Direct vs indirect activation of CRT not fully resolved"]},{"year":2007,"claim":"Mapped the 8th zinc finger as an oligomerization domain that binds RUNX1 and disrupts its DNA binding, identifying a mechanism by which EVI1 antagonizes a master myeloid regulator.","evidence":"In vitro binding, reporter assays, 32Dcl3 differentiation block","pmids":["17575132"],"confidence":"Medium","gaps":["Single lab; reciprocal in vivo validation limited","Endogenous chromatin context of RUNX1 antagonism untested"]},{"year":2011,"claim":"Established direct PTEN repression by EVI1 through polycomb recruitment, providing a mechanistic route to AKT/mTOR activation in leukemia and a rapamycin-sensitive vulnerability.","evidence":"ChIP, co-IP, murine BMT model, rapamycin sensitivity, human sample validation","pmids":["21289308"],"confidence":"High","gaps":["Which polycomb subunits are directly bound not fully defined","Generality across MECOM-rearranged subtypes not exhaustive"]},{"year":2011,"claim":"Defined a non-coding regulatory axis (EVI1 represses miR-449a, derepressing NOTCH1/BCL2) and structurally validated that ZF1 binding to GACAAGATA is essential for transformation, connecting DNA binding to oncogenic output.","evidence":"ChIP, miRNA profiling and re-expression rescue; DNase footprinting, EMSA, polyamide inhibition, colony assays","pmids":["21569010","22039883"],"confidence":"High","gaps":["miR-449a axis from single lab (Medium)","Specificity of polyamide inhibition in vivo not established"]},{"year":2011,"claim":"Demonstrated that the PR-domain isoform Mds1-Evi1 is HSC-restricted and essential for stem cell quiescence and long-term repopulation via p57-Kip2/Cdkn1c, distinguishing its physiological role from EVI1.","evidence":"lacZ knock-in mouse, BMT, RNA-seq, retroviral rescue","pmids":["21666053"],"confidence":"High","gaps":["Whether methyltransferase activity is required for HSC function untested here","Direct vs indirect regulation of Cdkn1c not resolved"]},{"year":2012,"claim":"Identified PRDM3/PRDM16 as redundant H3K9me1-specific methyltransferases required to seed heterochromatin formation and maintain the nuclear lamina, assigning a catalytic chromatin function to the PR domain.","evidence":"In vitro methyltransferase assay, MEF analyses, DNA-FISH, EM, siRNA","pmids":["22939622"],"confidence":"High","gaps":["Genomic loci directed by PRDM3 specifically vs PRDM16 not resolved","Link between this catalytic role and leukemia not addressed here"]},{"year":2012,"claim":"Showed EVI1 activation produces biphasic growth effects and a stemness/anti-proliferative transcriptional signature, illustrating dose- and time-dependent control of progenitor fate.","evidence":"Inducible lentiviral expression, microarray, cell cycle analysis","pmids":["23212151"],"confidence":"Medium","gaps":["Single lab; direct vs indirect targets not separated","In vivo relevance of biphasic effect untested"]},{"year":2013,"claim":"Extended MECOM function to non-hematopoietic contexts: KRAS upregulation via miR-96 in pancreatic cancer, distal tubule/nephron patterning upstream of Notch in zebrafish, and PR-domain dependence of MLL-AF9 leukemia.","evidence":"shRNA knockdown and miRNA validation; morpholino knockdown with NICD rescue; ME-deficient mouse transformation panel with PR-domain mutants","pmids":["23752186","24309209","24021671"],"confidence":"High","gaps":["Mechanism of miR-96 regulation (direct vs indirect) not defined","Why PR domain is selectively required for MLL fusions but not others unexplained"]},{"year":2015,"claim":"Identified MS4A3 as a directly repressed pro-apoptotic EVI1 target whose re-expression counteracts EVI1-driven tumor growth, adding to the repressed differentiation/apoptosis program.","evidence":"Reporter assay, ChIP, qRT-PCR, xenograft rescue","pmids":["25886616"],"confidence":"Medium","gaps":["Single lab","Contribution relative to other EVI1 targets unquantified"]},{"year":2017,"claim":"Connected EVI1 transcriptional repression of RUNX1 to a metabolic dependency (CKMT1-dependent arginine-creatine ATP buffering), revealing a druggable metabolic vulnerability in EVI1+ AML.","evidence":"shRNA screen, transcriptomics/metabolomics, cyclocreatine, xenograft and primary AML models, metabolic rescue","pmids":["28191887"],"confidence":"High","gaps":["Whether CKMT1 dependency extends to all MECOM rearrangements untested","Direct chromatin binding at CKMT1 not shown"]},{"year":2017,"claim":"Demonstrated isoform-specific autoregulation of the MECOM locus, with EVI1-145kDa autoactivating and MDS1-EVI1 repressing EVI1 transcription, and opposing effects on HSPC maintenance.","evidence":"EVI1-promoter luciferase reporters, retroviral isoform expression, colony assays","pmids":["28391050"],"confidence":"Medium","gaps":["Single lab","Endogenous autoregulatory loop not validated genetically"]},{"year":2019,"claim":"Revealed that distinct fusion contexts (RUNX1-EVI1 vs RUNX1-ETO) impose different chromatin and transcriptional programs, and that EVI1 drives OXPHOS/glutamine metabolic reprogramming sensitizing cells to L-asparaginase.","evidence":"ChIP-seq/ATAC-seq/RNA-seq dependency assays; extracellular flux, metabolomics, in vivo L-asparaginase","pmids":["28538183","31649131"],"confidence":"Medium","gaps":["Both single-lab studies","Mechanistic link between EVI1 transcription factor activity and metabolic shift incomplete"]},{"year":2019,"claim":"Defined the isoform-specific PRDM3-NuRD interaction at atomic resolution, showing RBBP4 binds the PR-SET N-terminal residues in the histone H3-binding groove, distinguishing PRDM3's chromatin partnerships from EVI1.","evidence":"Proteomics, ITC (Kd 3.0 µM), X-ray crystallography of PRDM3 peptide/RBBP4","pmids":["30462309"],"confidence":"High","gaps":["Functional consequence of NuRD recruitment on target genes not defined here","Whether RBBP4 binding competes with H3 substrate engagement in vivo unresolved"]},{"year":2021,"claim":"Extended MECOM to epithelial/solid-tumor and stress contexts: PRDM3-PAX8 complex driving adhesion/ECM programs in ovarian cancer and SOX9-driven MECOM enabling acinar dedifferentiation and survival via ERK.","evidence":"Co-IP, ChIP-seq, xenografts; lineage tracing, mouse loss-of-function, SOX9 regulation, ERK analysis","pmids":["33903593","33762742"],"confidence":"High","gaps":["PAX8 study single-lab co-IP for complex assembly","Direct MECOM target genes in acinar dedifferentiation not enumerated"]},{"year":2022,"claim":"Showed that mutant SF3B1 generates a novel in-frame EVI1 splice isoform via cryptic splice-site usage that enhances HSC self-renewal and accelerates leukemogenesis, linking spliceosome mutation to EVI1 oncogenicity.","evidence":"RNA splicing analysis, humanized inv(3)/Sf3b1 mouse model, HSC self-renewal assays","pmids":["35709354"],"confidence":"High","gaps":["Biochemical mechanism by which the 6-aa insertion enhances function unknown","Frequency of this isoform across patients not addressed"]},{"year":2023,"claim":"Established direct enhancer-driven activation as a core EVI1 oncogenic mechanism—ERG via an intragenic enhancer in AML and ETS2 via a disease-specific super-enhancer in colorectal/IBD—positioning EVI1 as a transcriptional activator at long-range regulatory elements.","evidence":"CRISPR screens, ChIP-seq, RNA-seq, EVI1-withdrawal and ERG epistasis; ChIP-seq, Hi-C, reporter and knockdown assays","pmids":["36095844","36609474"],"confidence":"High","gaps":["ETS2 study single-lab (Medium)","How activation vs repression is determined at different loci not mechanistically explained"]},{"year":2023,"claim":"Defined a developmental requirement for MECOM in endothelial identity and angiogenesis through enhancer chromatin loops regulating VEGF-pathway genes, broadening its physiological role beyond hematopoiesis.","evidence":"siRNA knockdown, scRNA-seq, Hi-C, DNase-seq, ChIP-seq, zebrafish angiogenesis","pmids":["37185814"],"confidence":"High","gaps":["Isoform responsible (EVI1 vs MDS1-EVI1) in endothelium not dissected","Direct VEGF-pathway target genes vs indirect effects not fully separated"]},{"year":2024,"claim":"Pinpointed a single PLDLS motif mediating EVI1-CTBP1/CTBP2 interaction as indispensable for leukemic transformation and showed a decoy peptide inhibits MECOM-rearranged AML, validating the corepressor interface as a therapeutic target; PRDM3/PRDM16 were also shown jointly required for NKX2-1-dependent alveolar differentiation.","evidence":"Proteomics, co-IP, PLDLS-decoy competition, xenotransplant; conditional lung knockouts with scRNA-seq, ATAC-seq, CUT&RUN","pmids":["38748792","39284798"],"confidence":"High","gaps":["In vivo pharmacology of decoy peptide beyond xenografts untested","Mechanism by which PRDM3/16 set chromatin accessibility at NKX2-1 targets not fully resolved"]},{"year":null,"claim":"How a single locus's opposing repressor (EVI1) and activator/methyltransferase (MDS1-EVI1/PRDM3) isoforms are deployed context-specifically—and what governs the switch between long-range enhancer activation and corepressor-mediated silencing at individual loci—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking PR-domain catalytic activity to isoform-specific gene programs in vivo","Determinants of activation vs repression at a given target not defined","Therapeutic selectivity of targeting EVI1 over PRDM3 isoform unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,3,8,24,28]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[16,1]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[10]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[10,20]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8,16,20]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,24,8]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[10,20,27]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,8,13]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[25,24,21]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,13,22,27]}],"complexes":["NuRD complex","polycomb repressive complex","CtBP/HDAC corepressor complex"],"partners":["SMAD3","CTBP1","CTBP2","HDAC1","RUNX1","RBBP4","PAX8"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q03112","full_name":"Histone-lysine N-methyltransferase MECOM","aliases":["Ecotropic virus integration site 1 protein homolog","EVI-1","MDS1 and EVI1 complex locus protein","Myelodysplasia syndrome 1 protein","Myelodysplasia syndrome-associated protein 1"],"length_aa":1230,"mass_kda":138.1,"function":"Functions as a transcriptional regulator binding to DNA sequences in the promoter region of target genes and regulating positively or negatively their expression. Oncogene which plays a role in development, cell proliferation and differentiation. May also play a role in apoptosis through regulation of the JNK and TGF-beta signaling. Involved in hematopoiesis Displays histone methyltransferase activity and monomethylates 'Lys-9' of histone H3 (H3K9me1). Probably catalyzes the monomethylation of free histone H3 in the cytoplasm which is then transported to the nucleus and incorporated into nucleosomes where SUV39H methyltransferases use it as a substrate to catalyze histone H3 'Lys-9' trimethylation. Likely to be one of the primary histone methyltransferases along with PRDM16 that direct cytoplasmic H3K9me1 methylation","subcellular_location":"Nucleus; Nucleus speckle; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q03112/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MECOM","classification":"Not Classified","n_dependent_lines":28,"n_total_lines":1208,"dependency_fraction":0.023178807947019868},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HDAC1","stoichiometry":0.2},{"gene":"HDAC2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/MECOM","total_profiled":1310},"omim":[{"mim_id":"616738","title":"RADIOULNAR SYNOSTOSIS WITH AMEGAKARYOCYTIC THROMBOCYTOPENIA 2; RUSAT2","url":"https://www.omim.org/entry/616738"},{"mim_id":"605984","title":"EMBRYONIC ECTODERM DEVELOPMENT; EED","url":"https://www.omim.org/entry/605984"},{"mim_id":"605432","title":"RADIOULNAR SYNOSTOSIS WITH AMEGAKARYOCYTIC THROMBOCYTOPENIA 1; RUSAT1","url":"https://www.omim.org/entry/605432"},{"mim_id":"602410","title":"BROMODOMAIN- AND PHD FINGER-CONTAINING PROTEIN; BRPF1","url":"https://www.omim.org/entry/602410"},{"mim_id":"300100","title":"ADRENOLEUKODYSTROPHY; ALD","url":"https://www.omim.org/entry/300100"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nuclear speckles","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"stomach 1","ntpm":69.2}],"url":"https://www.proteinatlas.org/search/MECOM"},"hgnc":{"alias_symbol":["MDS1-EVI1","PRDM3","KMT8E"],"prev_symbol":["MDS1","EVI1"]},"alphafold":{"accession":"Q03112","domains":[{"cath_id":"2.170.270.10","chopping":"74-112_122-191","consensus_level":"medium","plddt":66.5647,"start":74,"end":191},{"cath_id":"3.30.160.60","chopping":"350-427_910-992","consensus_level":"medium","plddt":80.6419,"start":350,"end":992}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q03112","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q03112-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q03112-F1-predicted_aligned_error_v6.png","plddt_mean":50.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MECOM","jax_strain_url":"https://www.jax.org/strain/search?query=MECOM"},"sequence":{"accession":"Q03112","fasta_url":"https://rest.uniprot.org/uniprotkb/Q03112.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q03112/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q03112"}},"corpus_meta":[{"pmid":"16582916","id":"PMC_16582916","title":"Correction 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EVI1 represses GATA-1-driven activation while MDS1/EVI1 does not; the activating function of MDS1/EVI1 maps to an acidic segment encoded by exons 2–3 in the 5' region.\",\n      \"method\": \"Reporter gene (luciferase) assays, Gal4 DNA-binding domain fusion constructs, comparative expression analysis\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro transcriptional assays with domain-mapping, multiple orthogonal reporter constructs, replicated in independent work\",\n      \"pmids\": [\"9067573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"EVI1 physically interacts with SMAD3 (an intracellular TGF-β signaling mediator) via a yeast two-hybrid assay; MDS1/EVI1 enhances TGF-β1-mediated growth inhibition whereas the leukemic fusion AML1/MDS1/EVI1 abrogates it; MDS1/EVI1 has no effect on G-CSF-induced granulocytic differentiation but AML1/MDS1/EVI1 blocks differentiation.\",\n      \"method\": \"Yeast two-hybrid, cell-line functional assays (32Dcl3), reporter gene assays\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid plus multiple cellular functional readouts, findings on EVI1-SMAD3 interaction replicated by independent labs\",\n      \"pmids\": [\"10086725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"EVI1 represses TGF-β signaling by physically interacting with SMAD3 through its first zinc-finger domain, suppressing SMAD3 transcriptional activity; EVI1 also recruits CtBP as a corepressor through a CtBP-binding motif (amino acids 544–607), and histone deacetylase (HDAC) inhibitor TSA alleviates EVI1-mediated TGF-β repression.\",\n      \"method\": \"Co-immunoprecipitation, reporter gene assays, domain-deletion analysis, pharmacological HDAC inhibition\",\n      \"journal\": \"Cancer chemotherapy and pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction assays with domain mapping, multiple orthogonal methods, findings replicated across studies\",\n      \"pmids\": [\"11587364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Both EVI1 and MDS1/EVI1 repress transcription from reporter constructs containing EVI1 binding sites and both physically interact with histone deacetylase (HDAC) in mammalian cells; this interaction can be recapitulated in vitro and is mediated by a previously characterized repression domain whose activity is alleviated by TSA.\",\n      \"method\": \"Reporter gene assays, co-immunoprecipitation (in vivo and in vitro), HDAC inhibitor (TSA)\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro interaction data, single lab, two orthogonal methods\",\n      \"pmids\": [\"11552981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The leukemic fusion protein AML1/MDS1/EVI1 (AME) physically interacts in vivo with CtBP1 and HDAC1 through distinct regions of AME; AME represses gene transcription by both CtBP1-dependent and CtBP1-independent mechanisms; the AME–CtBP1 interaction is required for growth upregulation and abnormal differentiation of murine hematopoietic precursor 32Dcl3 cells and bone marrow progenitors.\",\n      \"method\": \"Co-immunoprecipitation, reporter gene assays, domain-deletion analysis, cell functional assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP in vivo, multiple domain-deletion reporter assays, functional validation in primary cells\",\n      \"pmids\": [\"12082639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The leukemic fusion protein AML1/MDS1/EVI1 (AME) suppresses CEBPA protein and DNA-binding activity (~90%) without changing CEBPA mRNA levels; AME strongly activates calreticulin (CRT), which inhibits CEBPA translation; siRNA knockdown of CRT restores CEBPA protein levels in AME-expressing cells.\",\n      \"method\": \"Conditional expression system, western blot, EMSA, siRNA knockdown, quantitative RT-PCR\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods in cell line and patient samples, siRNA rescue experiment confirming mechanism\",\n      \"pmids\": [\"15326310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"EVI1 represses RUNX1 (AML1) function: the 8th zinc finger motif of EVI1/MDS1/EVI1 is an oligomerization domain that interacts with RUNX1 in vitro, altering RUNX1's DNA-binding ability and reporter gene regulation; in vivo, expression of the isolated 8th zinc finger motif of EVI1 blocks G-CSF-induced granulocytic differentiation of 32Dcl3 cells, leading to cell death.\",\n      \"method\": \"In vitro binding assay, reporter gene assay, cell functional assay (32Dcl3 differentiation model)\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro interaction plus in vivo functional phenotype, single lab\",\n      \"pmids\": [\"17575132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EVI1 directly represses PTEN transcription in murine bone marrow, leading to activation of AKT/mTOR signaling; EVI1 binds to polycomb group proteins and recruits polycomb repressive complexes to the PTEN locus for its down-regulation; this mechanism is recapitulated in human leukemic cells.\",\n      \"method\": \"ChIP assay, co-immunoprecipitation, murine bone marrow transplantation model, rapamycin sensitivity assay, human patient sample validation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP confirms direct binding, co-IP confirms polycomb interaction, functional validation in mouse model and human samples\",\n      \"pmids\": [\"21289308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PR-domain-containing Mds1-Evi1 (ME) is exclusively expressed in hematopoietic stem cells (HSCs); ME deficiency reduces HSC number and completely eliminates long-term repopulation capacity while shifting the stem cell compartment from quiescence to active cycling; ME preferentially rescues long-term HSC defects relative to EVI1; ME regulates p57-Kip2 (Cdkn1c) expression and reintroduction of ME normalizes p57-Kip2 expression and growth control.\",\n      \"method\": \"lacZ knock-in mouse model, bone marrow transplantation, RNA-seq in Lin-Sca-1+c-Kit+ cells, retroviral reintroduction rescue experiments\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic mouse model with multiple orthogonal readouts, rescue experiment, mechanistic target identified\",\n      \"pmids\": [\"21666053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Prdm3 (MECOM/MDS1-EVI1) and Prdm16 act as redundant H3K9me1-specific histone methyltransferases (KMTs) that direct cytoplasmic H3K9me1 methylation; simultaneous depletion of Prdm3 and Prdm16 abolishes H3K9me1 methylation, prevents Suv39h-dependent H3K9me3 trimethylation, derepresses major satellite transcription, and causes disintegration of heterochromatic foci and disruption of the nuclear lamina.\",\n      \"method\": \"Biochemical in vitro methyltransferase assay, in vivo mouse embryonic fibroblast analyses, DNA-FISH, electron microscopy, siRNA depletion\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay plus multiple orthogonal in vivo methods, replicated across organisms\",\n      \"pmids\": [\"22939622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"EVI1 activation in hematopoietic progenitor cells causes biphasic effects: initial growth inhibition with retarded myeloid differentiation and dose-dependent G0/G1 cell cycle arrest; EVI1 upregulates stemness genes (Aldh1a1, Abca1, Cdkn1b, Cdkn1c) and downregulates genes for DNA replication (cyclins) and DNA repair (Brca1, Brca2, Rad51) within 24 hours.\",\n      \"method\": \"Inducible lentiviral expression, gene expression microarray, cell cycle analysis\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible system with dose-response, microarray mechanistic target identification, single lab\",\n      \"pmids\": [\"23212151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EVI1 upregulates KRAS expression in pancreatic cancer cells by suppressing miR-96, a potent KRAS suppressor; EVI1 depletion causes inhibition of cell growth and migration.\",\n      \"method\": \"shRNA knockdown, miRNA target validation, cell proliferation/migration assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional knockdown with mechanistic miRNA target identification, single lab\",\n      \"pmids\": [\"23752186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In zebrafish, mecom is necessary for distal tubule formation and restricts proximal tubule formation and multiciliated cell (MCC) fate choice during nephron development; mecom acts upstream of Notch signaling to promote it (ectopic NICD rescues MCC expansion in mecom morphants); retinoic acid (RA) and mecom have opposing roles in proximal-distal segment patterning, with RA inhibiting mecom.\",\n      \"method\": \"Morpholino knockdown, genetic epistasis (DAPT/γ-secretase inhibitor, NICD overexpression rescue), zebrafish developmental phenotype analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with rescue experiment, multiple pathway interactions tested, clear cellular phenotype\",\n      \"pmids\": [\"24309209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The PR domain of MDS1-EVI1 (ME isoform) is essential for MLL-AF9-induced leukemic transformation in vitro and in vivo; ME is specifically required for MLL-AF9 and MLL-ENL leukemia but not for Nup98-HOXA9, MEIS1-HOXA9, or E2A-Hlf transformation; the PR domain histone methyltransferase activity is required for this function.\",\n      \"method\": \"ME-deficient mouse model, in vitro transformation assays, bone marrow transplantation, retroviral transduction with PR-domain mutants\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic mouse model with specific oncogene panel epistasis test, domain-function mutant analysis\",\n      \"pmids\": [\"24021671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EVI1 directly represses MIR449A via promoter occupation; MIR449A targets NOTCH1 and BCL2; the EVI1-MIR449A-NOTCH1/BCL2 regulatory axis contributes to survival of MECOM-rearranged leukemic cells.\",\n      \"method\": \"ChIP (chromatin immunoprecipitation), miRNA expression profiling, knockdown/re-expression models, apoptosis assays\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms direct promoter binding, functional rescue experiment with miRNA re-expression, single lab\",\n      \"pmids\": [\"21569010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Targeting EVI1's first zinc finger domain (ZF1) DNA-binding site with a synthetic pyrrole-imidazole polyamide blocks EVI1 binding to the GACAAGATA motif; structure-function studies showed that ZF1-mediated DNA binding to GACAAGATA is essential for EVI1 transforming activity.\",\n      \"method\": \"DNase I footprinting, EMSA, in vivo CAT reporter assay, colony formation assay, structure-function mutagenesis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding assay (footprinting + EMSA), in vivo reporter assay, domain mutagenesis, functional inhibition in leukemic cell line\",\n      \"pmids\": [\"22039883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"EVI1 directly represses MS4A3 transcription by binding to a proximal promoter region; experimental re-expression of MS4A3 in EVI1-overexpressing cells counteracts EVI1-promoted tumor growth by increasing apoptosis in a xenograft model.\",\n      \"method\": \"Reporter gene assay (luciferase), ChIP, qRT-PCR, xenograft tumor model\",\n      \"journal\": \"Journal of hematology & oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms direct binding, reporter gene assay confirms regulatory function, in vivo rescue validation, single lab\",\n      \"pmids\": [\"25886616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"EVI1 overexpression promotes CKMT1 expression by repressing the myeloid differentiation regulator RUNX1; CKMT1-dependent arginine-creatine metabolism (ATP buffering via mitochondrial creatine kinase) is required for survival of EVI1-positive AML cells; CKMT1 inhibition alters mitochondrial respiration and ATP production, and phosphocreatine reactivation of the arginine-creatine pathway abrogates these effects.\",\n      \"method\": \"shRNA screen, transcriptomic and metabolomic profiling, CKMT1 shRNA knockdown, small molecule (cyclocreatine) treatment, xenograft models, primary AML mouse models, metabolic flux analysis\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pooled shRNA screen followed by mechanistic validation with multiple orthogonal methods, in vivo rescue, metabolic rescue experiment\",\n      \"pmids\": [\"28191887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RUNX1-EVI1 (from t(3;21)) directs a stem cell-like transcriptional network reliant on GATA2 and displays distinct chromatin binding patterns and gene expression programs compared to RUNX1-ETO despite sharing the same RUNX1 DNA-binding domain; both AML types are dependent on continuous expression of their respective fusion proteins.\",\n      \"method\": \"ChIP-seq, ATAC-seq, RNA-seq, transcription factor dependency assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide chromatin and expression profiling, single lab, functional dependency validated\",\n      \"pmids\": [\"28538183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PRDM3 (MDS1-EVI1) directly interacts with the NuRD chromatin remodeling complex specifically through its N-terminal PR-SET domain residues, primarily via RBBP4; this interaction is isoform-specific (absent in EVI1/ΔPR isoform); RBBP4 binds to N-terminal amino acid residues of PRDM3 within the conserved histone H3-binding groove, as determined by X-ray crystal structures.\",\n      \"method\": \"Proteomics (interactome comparison of full-length vs. ΔPR isoforms), isothermal titration calorimetry (Kd = 3.0 μM), X-ray crystallography of PRDM3 N-terminal peptide/RBBP4 complex\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — X-ray crystal structure plus ITC quantitative binding measurement plus proteomics, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"30462309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MECOM (MDS1-EVI1/PRDM3) forms a protein complex with the transcription factor PAX8; PRDM3 interaction with PAX8 was mapped in vitro and in vivo; together PAX8 and PRDM3 regulate a specific gene expression module involved in adhesion and extracellular matrix at a subset of PAX8 genomic binding sites; the MECOM locus and PAX8 sustain in vivo tumor growth in ovarian cancer.\",\n      \"method\": \"Co-immunoprecipitation, in vitro and in vivo interaction mapping, ChIP-seq, transcriptomics, xenograft in vivo tumor model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP in vivo and in vitro, ChIP-seq genome-wide binding, in vivo functional validation\",\n      \"pmids\": [\"33903593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MECOM depletion impairs human endothelial cell differentiation and function and zebrafish angiogenesis; MECOM binds enhancers that form chromatin loops to regulate endothelial cell identity genes; the VEGF signaling pathway is a key transcriptional target of MECOM in endothelial cells.\",\n      \"method\": \"MECOM siRNA knockdown, single-cell RNA-seq, Hi-C, DNase-seq, ChIP-seq, RNA-seq, zebrafish angiogenesis assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with specific phenotype, integrative multi-omics (Hi-C, ChIP-seq, DNase-seq) in single study\",\n      \"pmids\": [\"37185814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Oncogenic SF3B1 mutations generate a novel in-frame EVI1 splice isoform containing a 6-amino acid insertion at the 3' end of the second zinc finger domain; this isoform enhances hematopoietic stem cell self-renewal and accelerates leukemogenesis in vivo; the mutant SF3B1 spliceosome uses an exonic splicing enhancer within EVI1 exon 13 to drive usage of a cryptic branch point and aberrant 3' splice site within intron 12.\",\n      \"method\": \"RNA splicing analysis, in vivo mouse leukemogenesis model (humanized inv(3) allele + mutant Sf3b1), HSC self-renewal assays, molecular characterization of splice site usage\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic mouse model, precise molecular mechanism of splice site usage defined, functional self-renewal assay\",\n      \"pmids\": [\"35709354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"EVI1 drives leukemogenesis primarily through direct transcriptional activation of the ETS transcription factor ERG; EVI1 occupies a conserved intragenic enhancer region of ERG in AML cell lines and primary AML; suppression of ERG induces terminal differentiation of EVI1-driven AML cells, whereas ectopic ERG expression abrogates dependence on EVI1.\",\n      \"method\": \"CRISPR genome-wide screens, ChIP-seq, RNA-seq, inducible EVI1 withdrawal models, ERG knockdown/overexpression epistasis in vitro and in vivo\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide CRISPR screens with targeted mechanistic follow-up, ChIP-seq confirming direct binding, epistasis rescue experiment in human and murine models\",\n      \"pmids\": [\"36095844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"EVI1 interaction with CTBP1 and CTBP2 via a single PLDLS motif is indispensable for leukemic transformation; a 4× PLDLS repeat decoy construct outcompetes EVI1 binding to CTBP1/CTBP2 and inhibits proliferation of 3q26/MECOM-rearranged AML in vitro and in xenotransplant models.\",\n      \"method\": \"Protein folding predictions, proteomics, co-immunoprecipitation, PLDLS-decoy peptide competition assay, in vitro proliferation assay, xenotransplant mouse model\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein interaction confirmed by proteomics and co-IP, functional rescue with competitive inhibitor in vitro and in vivo\",\n      \"pmids\": [\"38748792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Arsenic trioxide (ATO) degrades the AML1/MDS1/EVI1 (AME) fusion protein via the ubiquitin-proteasome pathway (for EVI1 moiety) and in a proteasome-independent manner (for MDS1 moiety); ATO treatment induces differentiation and apoptosis in AME leukemic cells in vitro and reduces tumor load in vivo.\",\n      \"method\": \"Western blot protein degradation assay, proteasome inhibitor experiments, cell differentiation/apoptosis assays, mouse transplant model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteasome inhibitor experiment identifies degradation pathway, functional validation in cells and mice, single lab\",\n      \"pmids\": [\"17145882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Combined deletion of Prdm3 and Prdm16 in lung endoderm causes perinatal lethality due to respiratory failure with loss of AT2 cells and accumulation of partially differentiated AT1 cells; PRDM3 and PRDM16 regulate chromatin accessibility at NKX2-1 transcriptional targets critical for AT2 cell differentiation; lineage-specific deletion in AT2 cells causes lineage infidelity with partial AT1 fate acquisition.\",\n      \"method\": \"Conditional knockout mouse models (single-cell RNA-seq, bulk ATAC-seq, CUT&RUN), lung morphological and functional phenotyping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic mouse models with multiple orthogonal epigenomic assays, clear mechanistic link between PRDM3/16 and chromatin accessibility at NKX2-1 targets\",\n      \"pmids\": [\"39284798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"EVI1 isoforms (EVI1-145kDa, EVI1-Δ324, MDS1-EVI1) regulate EVI1's own transcription through distinct promoter regions: EVI1-145kDa activates EVI1 transcription (autoactivation), whereas EVI1-Δ324 and MDS1-EVI1 act as repressors of EVI1 transcription; EVI1-145kDa prolongs maintenance of hematopoietic stem and progenitor cells while MDS1-EVI1 represses colony replating capacity.\",\n      \"method\": \"Reporter gene assays (luciferase with EVI1 promoter regions), retroviral expression of isoforms, hematopoietic colony assays\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter gene assays with multiple promoter constructs, functional hematopoietic assays, single lab\",\n      \"pmids\": [\"28391050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EVI1 splice variants in ovarian cancer (including Del190-515) bind CtBP1 and SMAD3 similar to wild-type EVI1, but localize preferentially to PML nuclear bodies; EVI1 wild-type and EVI1(Del427-515) (but not Del190-515) increase cyclin E1 LMW expression and promote cell cycle progression; knockdown of MDS1/EVI1 and EVI1(Del190-515) increases claudin-1 expression with reduction in cell migration.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence localization, cell cycle analysis, western blot, knockdown experiments\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP binding confirmed, localization by immunofluorescence, functional knockdown with migratory phenotype, single lab\",\n      \"pmids\": [\"23517670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MECOM (EVI1) expression in acinar cells during dedifferentiation is directly regulated by SOX9; MECOM deficiency in acinar cells impairs cell adhesion, increases acinar cell death, suppresses dedifferentiation, and limits ERK signaling; MECOM permits acinar cell survival under stress by enabling cellular dedifferentiation.\",\n      \"method\": \"Lineage tracing, RNA sequencing, genetic loss-of-function (mouse), SOX9 correlation and direct regulation assay, ERK pathway analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic mouse model with specific phenotypic readout, direct SOX9 regulation established, ERK pathway link identified, single lab\",\n      \"pmids\": [\"33762742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EVI1 overexpression in AML cells triggers metabolic reprogramming including acceleration of oxidative phosphorylation (OXPHOS) prior to glycolysis activation, with increased dependency on glutamine as an energy source; EVI1 drives production of TCA cycle metabolites; low ASNS expression in EVI1+ cells confers sensitivity to L-asparaginase.\",\n      \"method\": \"Extracellular flux analysis (XFp), mouse AML models (MLL-AF9/Evi1), metabolomics, cell viability assays, in vivo L-asparaginase treatment\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — metabolic flux measurements in mouse model and patient samples, mechanistic rescue with L-asparaginase and glutamine, single lab\",\n      \"pmids\": [\"31649131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"EVI1 activates the ETS2 super-enhancer in colorectal cancer/IBD through binding to a disease-specific super-enhancer that physically contacts the ETS2 promoter; an IBD-risk SNP in the ETS2 super-enhancer modulates ETS2 expression by affecting MECOM binding; silencing MECOM significantly downregulates ETS2 in CRC cells.\",\n      \"method\": \"ChIP-seq, Hi-C, enhancer RNA analysis, reporter gene assays, MECOM knockdown, cell colony-formation and migration assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq direct binding evidence, Hi-C chromatin loop confirmation, functional knockdown experiments, single lab\",\n      \"pmids\": [\"36609474\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MECOM encodes multiple protein isoforms from a single locus—most notably MDS1-EVI1 (PRDM3), which contains an N-terminal PR-SET domain with H3K9me1 histone methyltransferase activity, and the shorter EVI1, which lacks this domain. EVI1 functions as a transcriptional repressor that inhibits TGF-β/SMAD3 signaling (via direct SMAD3 interaction), represses PTEN to activate AKT/mTOR (by recruiting polycomb repressive complexes), represses GATA-binding and differentiation-linked promoters via CtBP/HDAC co-repressor recruitment (through a PLDLS motif essential for leukemic transformation), and directly activates the ERG transcription factor through an intragenic enhancer to drive leukemogenesis; MDS1-EVI1 (PRDM3) acts antagonistically as a GATA-motif transcriptional activator, methylates H3K9me1 to maintain heterochromatin integrity, interacts isoform-specifically with the NuRD chromatin remodeling complex via RBBP4, regulates hematopoietic stem cell quiescence through p57-Kip2 (Cdkn1c), and forms a functional complex with PAX8 to regulate adhesion/extracellular matrix gene expression in ovarian cancer.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MECOM encodes multiple protein isoforms from a single locus whose opposing activities govern transcriptional programs in hematopoietic stem cells, vascular endothelium, and epithelial development, and which are co-opted in leukemia and solid tumors [#1, #9, #22]. The shorter EVI1 isoform is a zinc-finger transcriptional repressor: it binds the GACAAGATA/AGATA motif through its first zinc finger, a DNA-binding event essential for transforming activity [#16], represses TGF-\\u03b2 signaling by physically engaging SMAD3 [#3], and recruits CtBP and HDAC corepressors through a defined repression domain to silence target genes [#3, #4]. EVI1 directly represses PTEN by recruiting polycomb repressive complexes, thereby activating AKT/mTOR signaling [#8], and silences differentiation- and apoptosis-linked targets including MS4A3, RUNX1, and the miR-449a/miR-96 axis [#17, #18, #15, #12]. In leukemic transformation EVI1 acts positively through direct activation of the ETS factor ERG via a conserved intragenic enhancer, with ERG re-expression bypassing EVI1 dependence [#24], while its interaction with CTBP1/CTBP2 through a single PLDLS motif is indispensable for transformation and is a tractable therapeutic vulnerability [#25]. The longer PR-domain isoform MDS1-EVI1 (PRDM3) behaves antagonistically as a GATA-motif transcriptional activator [#1] and is an H3K9me1-specific histone methyltransferase that, redundantly with PRDM16, maintains heterochromatin integrity and the nuclear lamina [#10]; through its PR-SET domain it engages the NuRD complex via RBBP4 in an isoform-specific manner [#20]. PRDM3 maintains hematopoietic stem cell quiescence and long-term repopulation via p57-Kip2/Cdkn1c [#9] and is specifically required for MLL-AF9-driven leukemia through its methyltransferase activity [#14]. Beyond hematopoiesis, MECOM controls endothelial identity and angiogenesis through enhancer-mediated VEGF-pathway regulation [#22], partners with PAX8 to drive adhesion/ECM programs in ovarian cancer [#21], and with PRDM16 regulates NKX2-1-dependent alveolar epithelial differentiation [#27].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established that the MECOM locus produces both an independent EVI1 transcript and an MDS1/EVI1 fusion transcript, the latter adding an N-terminal PR domain\\u2014defining the structural basis for two functionally distinct isoforms.\",\n      \"evidence\": \"RT-PCR and intergenic splicing characterization in normal tissues\",\n      \"pmids\": [\"8643684\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define functional consequences of the PR domain\", \"No enzymatic activity assigned to the PR domain at this stage\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstrated that the two isoforms are functionally opposed transcription factors\\u2014MDS1/EVI1 activates and EVI1 represses GATA-motif promoters\\u2014mapping the activating function to an acidic N-terminal segment.\",\n      \"evidence\": \"Luciferase reporter and Gal4-fusion assays with domain mapping\",\n      \"pmids\": [\"9067573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Corepressor identity for EVI1 repression not yet defined\", \"In vivo relevance to hematopoiesis untested\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Linked EVI1 to TGF-\\u03b2 signaling by showing physical SMAD3 interaction and demonstrating opposite isoform effects on growth inhibition, connecting the protein to a major antiproliferative pathway.\",\n      \"evidence\": \"Yeast two-hybrid plus 32Dcl3 cell functional assays\",\n      \"pmids\": [\"10086725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain mediating SMAD3 binding not yet mapped\", \"Mechanism of transcriptional repression downstream of SMAD3 unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the repressive machinery of EVI1: SMAD3 binding via the first zinc finger plus CtBP and HDAC corepressor recruitment, explaining how EVI1 silences TGF-\\u03b2 and other targets.\",\n      \"evidence\": \"Co-immunoprecipitation, domain-deletion reporter assays, TSA inhibition (two studies)\",\n      \"pmids\": [\"11587364\", \"11552981\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide target repertoire unknown\", \"Relative contribution of CtBP vs HDAC not dissected\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed the leukemic AML1/MDS1/EVI1 fusion uses both CtBP1-dependent and -independent repression and that CtBP1 binding is required for aberrant growth and differentiation of progenitors, tying corepressor recruitment to transformation.\",\n      \"evidence\": \"Reciprocal co-IP, domain-deletion reporter assays, 32Dcl3 and bone marrow functional assays\",\n      \"pmids\": [\"12082639\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CtBP1-independent repression mechanism not defined\", \"Direct target genes of the fusion not yet identified\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified a translational-control axis whereby the AME fusion activates calreticulin to suppress CEBPA protein, revealing post-transcriptional disruption of a myeloid differentiation factor.\",\n      \"evidence\": \"Conditional expression, EMSA, siRNA rescue of CRT\",\n      \"pmids\": [\"15326310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether full EVI1 (non-fusion) uses the same axis untested\", \"Direct vs indirect activation of CRT not fully resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapped the 8th zinc finger as an oligomerization domain that binds RUNX1 and disrupts its DNA binding, identifying a mechanism by which EVI1 antagonizes a master myeloid regulator.\",\n      \"evidence\": \"In vitro binding, reporter assays, 32Dcl3 differentiation block\",\n      \"pmids\": [\"17575132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; reciprocal in vivo validation limited\", \"Endogenous chromatin context of RUNX1 antagonism untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established direct PTEN repression by EVI1 through polycomb recruitment, providing a mechanistic route to AKT/mTOR activation in leukemia and a rapamycin-sensitive vulnerability.\",\n      \"evidence\": \"ChIP, co-IP, murine BMT model, rapamycin sensitivity, human sample validation\",\n      \"pmids\": [\"21289308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which polycomb subunits are directly bound not fully defined\", \"Generality across MECOM-rearranged subtypes not exhaustive\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined a non-coding regulatory axis (EVI1 represses miR-449a, derepressing NOTCH1/BCL2) and structurally validated that ZF1 binding to GACAAGATA is essential for transformation, connecting DNA binding to oncogenic output.\",\n      \"evidence\": \"ChIP, miRNA profiling and re-expression rescue; DNase footprinting, EMSA, polyamide inhibition, colony assays\",\n      \"pmids\": [\"21569010\", \"22039883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"miR-449a axis from single lab (Medium)\", \"Specificity of polyamide inhibition in vivo not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated that the PR-domain isoform Mds1-Evi1 is HSC-restricted and essential for stem cell quiescence and long-term repopulation via p57-Kip2/Cdkn1c, distinguishing its physiological role from EVI1.\",\n      \"evidence\": \"lacZ knock-in mouse, BMT, RNA-seq, retroviral rescue\",\n      \"pmids\": [\"21666053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether methyltransferase activity is required for HSC function untested here\", \"Direct vs indirect regulation of Cdkn1c not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified PRDM3/PRDM16 as redundant H3K9me1-specific methyltransferases required to seed heterochromatin formation and maintain the nuclear lamina, assigning a catalytic chromatin function to the PR domain.\",\n      \"evidence\": \"In vitro methyltransferase assay, MEF analyses, DNA-FISH, EM, siRNA\",\n      \"pmids\": [\"22939622\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genomic loci directed by PRDM3 specifically vs PRDM16 not resolved\", \"Link between this catalytic role and leukemia not addressed here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed EVI1 activation produces biphasic growth effects and a stemness/anti-proliferative transcriptional signature, illustrating dose- and time-dependent control of progenitor fate.\",\n      \"evidence\": \"Inducible lentiviral expression, microarray, cell cycle analysis\",\n      \"pmids\": [\"23212151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct vs indirect targets not separated\", \"In vivo relevance of biphasic effect untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended MECOM function to non-hematopoietic contexts: KRAS upregulation via miR-96 in pancreatic cancer, distal tubule/nephron patterning upstream of Notch in zebrafish, and PR-domain dependence of MLL-AF9 leukemia.\",\n      \"evidence\": \"shRNA knockdown and miRNA validation; morpholino knockdown with NICD rescue; ME-deficient mouse transformation panel with PR-domain mutants\",\n      \"pmids\": [\"23752186\", \"24309209\", \"24021671\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of miR-96 regulation (direct vs indirect) not defined\", \"Why PR domain is selectively required for MLL fusions but not others unexplained\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified MS4A3 as a directly repressed pro-apoptotic EVI1 target whose re-expression counteracts EVI1-driven tumor growth, adding to the repressed differentiation/apoptosis program.\",\n      \"evidence\": \"Reporter assay, ChIP, qRT-PCR, xenograft rescue\",\n      \"pmids\": [\"25886616\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Contribution relative to other EVI1 targets unquantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected EVI1 transcriptional repression of RUNX1 to a metabolic dependency (CKMT1-dependent arginine-creatine ATP buffering), revealing a druggable metabolic vulnerability in EVI1+ AML.\",\n      \"evidence\": \"shRNA screen, transcriptomics/metabolomics, cyclocreatine, xenograft and primary AML models, metabolic rescue\",\n      \"pmids\": [\"28191887\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CKMT1 dependency extends to all MECOM rearrangements untested\", \"Direct chromatin binding at CKMT1 not shown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated isoform-specific autoregulation of the MECOM locus, with EVI1-145kDa autoactivating and MDS1-EVI1 repressing EVI1 transcription, and opposing effects on HSPC maintenance.\",\n      \"evidence\": \"EVI1-promoter luciferase reporters, retroviral isoform expression, colony assays\",\n      \"pmids\": [\"28391050\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Endogenous autoregulatory loop not validated genetically\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed that distinct fusion contexts (RUNX1-EVI1 vs RUNX1-ETO) impose different chromatin and transcriptional programs, and that EVI1 drives OXPHOS/glutamine metabolic reprogramming sensitizing cells to L-asparaginase.\",\n      \"evidence\": \"ChIP-seq/ATAC-seq/RNA-seq dependency assays; extracellular flux, metabolomics, in vivo L-asparaginase\",\n      \"pmids\": [\"28538183\", \"31649131\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Both single-lab studies\", \"Mechanistic link between EVI1 transcription factor activity and metabolic shift incomplete\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined the isoform-specific PRDM3-NuRD interaction at atomic resolution, showing RBBP4 binds the PR-SET N-terminal residues in the histone H3-binding groove, distinguishing PRDM3's chromatin partnerships from EVI1.\",\n      \"evidence\": \"Proteomics, ITC (Kd 3.0 \\u00b5M), X-ray crystallography of PRDM3 peptide/RBBP4\",\n      \"pmids\": [\"30462309\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of NuRD recruitment on target genes not defined here\", \"Whether RBBP4 binding competes with H3 substrate engagement in vivo unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended MECOM to epithelial/solid-tumor and stress contexts: PRDM3-PAX8 complex driving adhesion/ECM programs in ovarian cancer and SOX9-driven MECOM enabling acinar dedifferentiation and survival via ERK.\",\n      \"evidence\": \"Co-IP, ChIP-seq, xenografts; lineage tracing, mouse loss-of-function, SOX9 regulation, ERK analysis\",\n      \"pmids\": [\"33903593\", \"33762742\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PAX8 study single-lab co-IP for complex assembly\", \"Direct MECOM target genes in acinar dedifferentiation not enumerated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed that mutant SF3B1 generates a novel in-frame EVI1 splice isoform via cryptic splice-site usage that enhances HSC self-renewal and accelerates leukemogenesis, linking spliceosome mutation to EVI1 oncogenicity.\",\n      \"evidence\": \"RNA splicing analysis, humanized inv(3)/Sf3b1 mouse model, HSC self-renewal assays\",\n      \"pmids\": [\"35709354\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism by which the 6-aa insertion enhances function unknown\", \"Frequency of this isoform across patients not addressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established direct enhancer-driven activation as a core EVI1 oncogenic mechanism\\u2014ERG via an intragenic enhancer in AML and ETS2 via a disease-specific super-enhancer in colorectal/IBD\\u2014positioning EVI1 as a transcriptional activator at long-range regulatory elements.\",\n      \"evidence\": \"CRISPR screens, ChIP-seq, RNA-seq, EVI1-withdrawal and ERG epistasis; ChIP-seq, Hi-C, reporter and knockdown assays\",\n      \"pmids\": [\"36095844\", \"36609474\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ETS2 study single-lab (Medium)\", \"How activation vs repression is determined at different loci not mechanistically explained\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a developmental requirement for MECOM in endothelial identity and angiogenesis through enhancer chromatin loops regulating VEGF-pathway genes, broadening its physiological role beyond hematopoiesis.\",\n      \"evidence\": \"siRNA knockdown, scRNA-seq, Hi-C, DNase-seq, ChIP-seq, zebrafish angiogenesis\",\n      \"pmids\": [\"37185814\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Isoform responsible (EVI1 vs MDS1-EVI1) in endothelium not dissected\", \"Direct VEGF-pathway target genes vs indirect effects not fully separated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Pinpointed a single PLDLS motif mediating EVI1-CTBP1/CTBP2 interaction as indispensable for leukemic transformation and showed a decoy peptide inhibits MECOM-rearranged AML, validating the corepressor interface as a therapeutic target; PRDM3/PRDM16 were also shown jointly required for NKX2-1-dependent alveolar differentiation.\",\n      \"evidence\": \"Proteomics, co-IP, PLDLS-decoy competition, xenotransplant; conditional lung knockouts with scRNA-seq, ATAC-seq, CUT&RUN\",\n      \"pmids\": [\"38748792\", \"39284798\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo pharmacology of decoy peptide beyond xenografts untested\", \"Mechanism by which PRDM3/16 set chromatin accessibility at NKX2-1 targets not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single locus's opposing repressor (EVI1) and activator/methyltransferase (MDS1-EVI1/PRDM3) isoforms are deployed context-specifically\\u2014and what governs the switch between long-range enhancer activation and corepressor-mediated silencing at individual loci\\u2014remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking PR-domain catalytic activity to isoform-specific gene programs in vivo\", \"Determinants of activation vs repression at a given target not defined\", \"Therapeutic selectivity of targeting EVI1 over PRDM3 isoform unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 3, 8, 24, 28]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [16, 1]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [10, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8, 16, 20]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 24, 8]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [10, 20, 27]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 8, 13]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [25, 24, 21]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 13, 22, 27]}\n    ],\n    \"complexes\": [\"NuRD complex\", \"polycomb repressive complex\", \"CtBP/HDAC corepressor complex\"],\n    \"partners\": [\"SMAD3\", \"CTBP1\", \"CTBP2\", \"HDAC1\", \"RUNX1\", \"RBBP4\", \"PAX8\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}