{"gene":"DOT1L","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2002,"finding":"Dot1 (yeast ortholog of DOT1L) methylates lysine 79 of histone H3, which resides in the globular domain of the nucleosome core. Mutations abolishing Dot1 catalytic activity impair telomeric silencing, and dot1/H3-K79 mutations weaken the interaction of Sir2 and Sir3 with the telomeric region in vivo.","method":"Genetic mutagenesis of H3-K79 and Dot1 catalytic residues; in vivo chromatin immunoprecipitation of Sir proteins; biochemical identification of H3K79 methylation by mass spectrometry","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (mass spectrometry, mutagenesis, ChIP) in foundational paper, widely replicated","pmids":["12080090"],"is_preprint":false},{"year":2005,"finding":"H2B ubiquitylation at K123 is required for the transition from monomethylation to di- and trimethylation of H3K79 by Dot1 (processive methylation), but is dispensable for monomethylation. Dot1 binding to chromatin occurs normally in the absence of H2B-K123 ubiquitylation, indicating ubiquitylation regulates enzyme processivity rather than recruitment.","method":"Chromatin immunoprecipitation; mass spectrometry of histone modifications; genetic deletion of Rad6-Bre1 pathway components","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 — mass spectrometry + ChIP + genetics with clear mechanistic conclusion","pmids":["16039595"],"is_preprint":false},{"year":2005,"finding":"Dot1-dependent H3K79 methylation is required for DNA damage checkpoint activation in yeast G1 and S phase. Loss of Dot1 prevents phosphorylation of the checkpoint adaptor Rad9 and activation of the Rad53 kinase after ionizing radiation, placing Dot1/H3K79me upstream of Rad9 in the checkpoint pathway. In human cells, H3K79 methylation by DOT1L mediates recruitment of 53BP1 via its paired tudor domains to double-strand breaks.","method":"Genetic deletion/mutagenesis; kinase phosphorylation assays; chromatin immunoprecipitation; epistasis analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — epistasis, biochemical phosphorylation assays, ChIP; replicated in companion paper (PMID:15632126)","pmids":["16166626","15632126"],"is_preprint":false},{"year":2008,"finding":"DOT1L is ubiquitously coupled with active transcription in mammalian cells; it preferentially occupies the proximal transcribed region of active genes correlating with H3K79 di- and trimethylation enrichment. Dot1l mutant fibroblasts lack H3K79 di- and trimethylation at all sites, establishing DOT1L as the sole enzyme responsible for these marks. H3K79 methylation levels dynamically respond to changes in gene activity.","method":"ChIP-chip tiling arrays; Dot1l mutant fibroblasts; genome-wide correlation of H3K79me with mRNA abundance","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — genome-wide ChIP-chip plus genetic knockout establishing sole enzymatic responsibility","pmids":["18285465"],"is_preprint":false},{"year":2009,"finding":"H2B monoubiquitination at K123 is the critical determinant for H3K79 trimethylation by Dot1 in yeast, confirmed independently of strain background or epitope-tagged proteins.","method":"Genetic deletion of H2B-K123 ubiquitination pathway; histone alanine-scanning mutants; mass spectrometry of methylation states","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 — genetic reconstitution with rigorous controls to resolve prior controversy","pmids":["19667127"],"is_preprint":false},{"year":2010,"finding":"DOT1L (Dot1l) is identified as part of a multisubunit DotCom complex including MLL fusion partners ENL, AF9/MLLT3, AF17/MLLT6, AF10/MLLT10, and Wnt pathway components TRRAP, Skp1, and β-catenin. The human DotCom complex trimethylates H3K79. Knockdown of Dot1 in Drosophila reduces Wingless target gene expression, and loss of H2B monoubiquitination (via Bre1 depletion) specifically reduces H3K79 trimethylation and Wingless target gene expression.","method":"Affinity purification/mass spectrometry of the complex; in vitro H3K79 trimethylation assay; Drosophila RNAi knockdown; genetic epistasis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 — complex purified by MS, enzymatic activity confirmed in vitro, genetic validation in vivo","pmids":["20203130"],"is_preprint":false},{"year":2010,"finding":"Mllt10/AF10 and DOT1L are identified as TCF4/β-catenin interacting partners in mouse intestinal crypts. Mllt10/AF10-Dot1l are recruited to Wnt target genes in a β-catenin-dependent manner, resulting in H3K79 methylation over their coding regions. MLLT10/AF10 and DOT1L are essential activators of Wnt target gene regulation; depletion of Mllt10 and Dot1l in apc-mutant zebrafish rescues intestinal differentiation defects.","method":"Proteomics (co-IP/MS); chromatin immunoprecipitation; shRNA knockdown + expression arrays; zebrafish morpholino; genetic epistasis with apc","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, ChIP, genetic epistasis in multiple model systems","pmids":["21103407"],"is_preprint":false},{"year":2011,"finding":"Cardiac-specific knockout of Dot1L in mice causes dilated cardiomyopathy. Mechanistically, DOT1L regulates Dystrophin (Dmd) transcription and stability of the Dystrophin-glycoprotein complex; expression of a miniDmd rescues the cardiomyopathy phenotype, establishing Dmd as the major downstream target of DOT1L in cardiomyocytes.","method":"Conditional cardiac knockout mouse; gene expression analysis; miniDmd rescue experiment; Western blot for Dystrophin-glycoprotein complex","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined phenotype, rescue experiment establishes mechanistic pathway","pmids":["21289070"],"is_preprint":false},{"year":2011,"finding":"Dot1 and H3K79 methylation (yeast) are required for global genomic repair (GGR) but not transcription-coupled repair (TCR) in nucleotide excision repair. Dot1/H3K79me facilitates GGR independently of checkpoint activation or regulation of Rad16 expression, suggesting methylated H3K79 serves as a docking site for the GGR machinery on chromatin.","method":"Genetic deletion of Dot1; UV-induced DNA damage repair assays in nucleosomal and linker DNA regions; epistasis with checkpoint and repair mutants","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with clean pathway dissection, single lab","pmids":["21460225"],"is_preprint":false},{"year":2012,"finding":"Crystal structures of DOT1L with aminonucleoside inhibitors reveal a conformational adaptation mechanism: high-affinity inhibitor binding induces a conformational change in DOT1L that also plays a role in natural SAM substrate interactions and enzyme turnover, explaining slow dissociation kinetics.","method":"X-ray crystallography; structure-activity relationship studies; enzyme kinetics (kon/koff measurement)","journal":"Chemical biology & drug design","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with mechanistic interpretation and SAR validation","pmids":["22978415"],"is_preprint":false},{"year":2013,"finding":"The AF9/ENL-binding site in human DOT1L was mapped to a 10-amino acid region (DOT1L865-874). Alanine scanning mutagenesis identified four conserved hydrophobic residues essential for interaction with AF9/ENL. The AF9/ENL-interacting site is essential for immortalization by MLL-AF9, establishing that DOT1L recruitment via this interaction is required for MLL-AF9-driven transformation.","method":"Biochemical mapping (alanine scanning mutagenesis); biophysical binding assays; functional immortalization assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — mutagenesis + biophysical + functional validation; clear mechanistic conclusion","pmids":["23996074"],"is_preprint":false},{"year":2013,"finding":"DOT1L crystal structure in complex with Bromo-deaza-SAH reveals that a halogen atom at the adenosine scaffold creates selective contacts with the DOT1L active site, explaining selectivity over other methyltransferases.","method":"X-ray crystallography; enzyme inhibition assays","journal":"Bioorganic & medicinal chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with biochemical validation","pmids":["23433670"],"is_preprint":false},{"year":2013,"finding":"Dot1-dependent H3K79 methylation activates the meiotic checkpoint effector Mek1 kinase by promoting Hop1 activation and proper distribution along meiotic chromosomes; Dot1 is required for Mek1 autophosphorylation but not Mec1/Tel1-dependent phosphorylation. H3K79me excludes Pch2 from chromosomes, enabling Hop1 localization along chromosome axes.","method":"Genetic analysis of dot1 deletion and H3-K79 mutants; meiotic checkpoint assays; Mek1 phosphorylation assays; Hop1 and Pch2 localization by microscopy","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic and biochemical assays establishing pathway mechanism","pmids":["23382701"],"is_preprint":false},{"year":2014,"finding":"The AF9 YEATS domain binds H3K9 acetylation (and to lesser extent H3K27ac and H3K18ac). Crystal structural studies reveal an eight-stranded immunoglobulin fold with a serine-lined aromatic sandwiching cage for acetyllysine recognition. Genome-wide colocalization of AF9 and H3K9ac is important for chromatin recruitment of the H3K79 methyltransferase DOT1L, establishing a direct link between histone acetylation and DOT1L-mediated H3K79 methylation.","method":"Crystal structure of AF9 YEATS with acetyl-H3K9 peptide; ChIP-seq; mutagenesis; in vitro binding assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — crystal structure + ChIP-seq + mutagenesis establishing mechanism of DOT1L recruitment","pmids":["25417107"],"is_preprint":false},{"year":2016,"finding":"BRD4 and DOT1L exist in separate protein complexes in cells but show functional interdependence at MLL leukemia genes. DOT1L, via dimethylated H3K79, facilitates histone H4 acetylation, which in turn regulates BRD4 binding to chromatin. This functional collaboration is especially important at highly transcribed genes near superenhancers.","method":"Quantitative proteomics; chemoproteomics; biochemical fractionation; genetic disruption; small-molecule inhibition; ChIP","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 — quantitative proteomics + ChIP + genetic/pharmacological perturbations establishing mechanistic cross-talk","pmids":["27294782"],"is_preprint":false},{"year":2018,"finding":"Crystal structures of DOT1L-AF10 complex reveal that AF10 octapeptide motif leucine zipper (OM-LZ) directly binds the coiled-coil domain of DOT1L. Zinc stabilizes the DOT1L-AF10 complex. Disruption of the DOT1L-AF10 interface abrogates MLL-AF10-associated leukemic transformation.","method":"X-ray crystallography of apo AF10OM-LZ and DOT1L-AF10 complex; mutagenesis of interface residues; functional leukemic transformation assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 — crystal structure + mutagenesis + functional validation","pmids":["29563185"],"is_preprint":false},{"year":2019,"finding":"Cryo-EM structure of DOT1L bound to a nucleosome with site-specifically ubiquitylated H2BK120 shows that DOT1L engages the nucleosome acidic patch using a variant arginine anchor and occupies a conformation poised for methylation. DOT1L and H2BK120-linked ubiquitin interact directly through complementary hydrophobic surfaces, providing the structural basis for trans-histone crosstalk activation of DOT1L.","method":"Cryo-electron microscopy (cryo-EM) structure of DOT1L-ubiquitylated nucleosome complex; site-specific ubiquitylation reconstitution","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure with reconstituted ubiquitylated nucleosome providing direct structural mechanism","pmids":["30759380"],"is_preprint":false},{"year":2019,"finding":"DOT1L co-localizes with estrogen receptor α (ERα) in breast cancer cell chromatin to regulate estrogen target gene transcription. DOT1L blockade reduces H3K79 methylation and suppresses ERα and FOXA1 gene expression, providing a mechanism for DOT1L's role in breast cancer cell proliferation.","method":"ChIP-seq colocalization; siRNA knockdown; pharmacological inhibition (EPZ5676); gene expression analysis; xenograft model","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq + genetic/pharmacological KD with defined phenotype; single lab","pmids":["30775443"],"is_preprint":false},{"year":2020,"finding":"DOT1L has a catalytic-independent role in promoting productive transcription elongation: DOT1L loss (but not catalytic inactivation) exacerbates transcription elongation defects caused by super elongation complex inhibition, establishing that DOT1L's role in elongation is distinct from its H3K79 methylation activity. DOT1L loss (but not catalytic inactivation) is also required for neural progenitor cell fate determination.","method":"DOT1L knockout vs catalytically dead DOT1L knock-in ESC models; transcriptome analysis; super elongation complex inhibitor treatment; neural progenitor differentiation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — direct comparison of KO vs catalytic dead allele with multiple functional readouts","pmids":["33077595"],"is_preprint":false},{"year":2020,"finding":"DOT1L controls CD8+ T cell differentiation by ensuring normal T cell receptor density and signaling, and maintains epigenetic identity by indirectly supporting repression of developmentally regulated genes. T cell-specific Dot1L ablation causes loss of naïve CD8+ T cells and premature differentiation toward a memory-like state in a cell-intrinsic manner.","method":"T cell-specific conditional Dot1L knockout; flow cytometry; TCR signaling assays; epigenomic and transcriptomic analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined cellular phenotype and mechanistic TCR signaling analysis","pmids":["32764145"],"is_preprint":false},{"year":2020,"finding":"DOT1L interacts with Zc3h10 transcription factor and is recruited by Zc3h10 to promoter regions of thermogenic genes (including Ucp1) in brown adipose tissue, where it methylates H3K79 to function as a coactivator. DOT1L ablation in brown fat (Ucp1-Cre) prevents Ucp1 activation and reduces thermogenic capacity, promoting adiposity.","method":"Co-immunoprecipitation; ChIP; conditional Dot1L knockout (Ucp1-Cre); thermogenic gene expression and energy expenditure assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP establishing direct interaction, ChIP showing recruitment, in vivo conditional KO with functional phenotype","pmids":["33107819"],"is_preprint":false},{"year":2020,"finding":"DOT1L inhibition in prostate cancer cells leads to reduced MYC expression and upregulation of MYC-regulated E3 ubiquitin ligases HECTD4 and MYCBP2, which promote AR and MYC protein degradation. A distal H3K79 methylation-marked enhancer in the MYC gene is bound by both AR and DOT1L in AR-positive cells.","method":"Genetic and chemical inhibition of DOT1L; ChIP; co-immunoprecipitation; ubiquitin ligase functional assays; organoids","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP + genetic KD with defined mechanistic pathway; single lab","pmids":["32814769"],"is_preprint":false},{"year":2020,"finding":"CBP mediates DOT1L K358 acetylation in colon cancer cells. This acetylation prevents RNF8 binding to DOT1L and subsequent proteasomal degradation, thereby stabilizing DOT1L without affecting its enzymatic activity. Stabilized DOT1L then catalyzes H3K79 methylation of SNAIL and ZEB1 gene promoters to promote epithelial-mesenchymal transition and metastasis.","method":"Affinity purification and mass spectrometry identifying acetylation; co-immunoprecipitation of RNF8-DOT1L; proteasome inhibitor assays; ChIP; acetylation mimic mutant; in vivo metastasis model","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1–2 — MS identification of modification + biochemical validation of writer (CBP)/eraser pathway + mechanistic consequences","pmids":["32042335"],"is_preprint":false},{"year":2021,"finding":"H4K16 acetylation allosterically stimulates yeast Dot1 H3K79 methyltransferase activity in a manner distinct from but coordinating with H2B ubiquitination (H2BUb). H4K16ac specifically (not other H4 acetylations) and H2BUb play crucial roles in H3K79 di- and trimethylation in vitro and in vivo.","method":"In vitro reconstitution methyltransferase assay with defined histone modifications; mutagenesis; ChIP in yeast mutants","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution + mutagenesis + in vivo ChIP establishing allosteric mechanism","pmids":["33479126"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of Dot1L bound to a H2BK34ub nucleosome reveal that H2BK34-anchored ubiquitin does not directly contact Dot1L (unlike H2BK120ub), but instead induces DNA and histone distortion around the modified site, positioning Dot1L in a productive conformation. This establishes nucleosome distortion as a distinct mechanism for ubiquitination-dependent activation of Dot1L.","method":"Cryo-EM structure of Dot1L-H2BK34ub nucleosome and H2BK34ub nucleosome alone; site-specific ubiquitylation; in vitro methyltransferase assay","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 — dual cryo-EM structures with reconstituted ubiquitylated nucleosome and enzymatic validation","pmids":["35739357"],"is_preprint":false},{"year":2022,"finding":"H3K79me2 regulates highly specific transcriptional networks during cardiogenesis rather than acting as a general transcriptional activator. H3K79me2 in gene bodies and regulatory elements synergize to promote gene activation, and H3K79me2 at specific regulatory elements also contributes to silencing of genes not normally expressed in cardiomyocytes. DOT1L is particularly important for left ventricle-specific genes and postnatal cardiomyocyte cell cycle withdrawal.","method":"Embryonic cardiomyocyte-specific Dot1L conditional knockout; H3K79me2 ChIP-seq; RNA-seq; analysis of mononuclear cardiomyocytes","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — conditional KO + genome-wide ChIP-seq revealing context-specific mechanism","pmids":["36460641"],"is_preprint":false},{"year":2022,"finding":"DOT1L maintains spermatogonial stem cell self-renewal by promoting expression of fate-determining HoxC transcription factors; H3K79me2 accumulates at HoxC9 and HoxC10 gene loci. Mice lacking DOT1L fail to maintain spermatogonial stem cells, leading to progressive loss of germ cells and Sertoli cell-only syndrome.","method":"Conditional Dot1L knockout; transplantation assay; H3K79me2 ChIP; gene expression analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — conditional KO + transplantation + ChIP establishing mechanistic pathway","pmids":["35738678"],"is_preprint":false},{"year":2022,"finding":"H3T11 phosphorylation by the SESAME complex (pyruvate kinase Pyk1) directly inhibits Dot1-catalyzed H3K79 trimethylation by reducing Dot1 binding to chromatin. This crosstalk regulates autophagy gene transcription and telomere silencing; H3pT11 and H3K79me3 work together to promote SIR complex binding at telomeres.","method":"In vitro methyltransferase assay; ChIP; genetic analysis of SESAME/Pyk1 and Dot1 mutants; autophagy assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro reconstitution + genetics + ChIP establishing cross-talk mechanism","pmids":["36473858"],"is_preprint":false},{"year":2018,"finding":"DOT1L facilitates nucleotide excision repair (NER) of UV-induced DNA damage by methylating H3K79, with H3K79-methylated chromatin recruiting the XPC damage recognition factor to DNA damage sites for NER. DOT1L mutations in melanoma functionally compromise methyltransferase enzyme activity leading to reduced H3K79 methylation and impaired UV-induced DNA damage repair.","method":"Functional methyltransferase assay of DOT1L mutants; ChIP of XPC at damage sites; Dot1L knockout mouse + UVR exposure; NER assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — enzymatic assay of mutations + ChIP + in vivo mouse model establishing mechanism","pmids":["29343685"],"is_preprint":false},{"year":2020,"finding":"The lncRNA LAMP5-AS1 directly binds the lysine-rich region of the DOT1L catalytic domain and facilitates its methyltransferase activity, promoting global H3K79 dimethylation and trimethylation in MLL leukemia cells, leading to upregulated HOXA cluster gene expression.","method":"RNA electrophoretic mobility shift assay (EMSA); in vitro histone methyltransferase assay; RNA pulldown; RNA FISH; ChIP","journal":"Journal of hematology & oncology","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding EMSA + in vitro enzymatic assay; single lab","pmids":["32552847"],"is_preprint":false},{"year":2017,"finding":"N-Myc upregulates DOT1L mRNA and protein by binding to the DOT1L gene promoter. DOT1L protein binds to the Myc Box II domain of N-Myc protein and knockdown of DOT1L reduces H3K79 methylation and N-Myc binding at target gene promoters, establishing DOT1L as a cofactor in N-Myc-mediated transcriptional activation.","method":"ChIP at DOT1L promoter; co-immunoprecipitation of DOT1L-N-Myc; shRNA knockdown; ChIP at target promoters; xenograft model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2–3 — co-IP + ChIP establishing interaction and functional consequence; single lab","pmids":["28209620"],"is_preprint":false},{"year":2010,"finding":"The DOT1L-containing complex purified by tandem affinity purification contains AF9, ENL, and NPM1 as major interacting proteins. The network suggests DOT1L controls AF9- and ENL-mediated transcription and may function as a histone chaperone in an NPM1-dependent manner.","method":"Tandem affinity purification; mass spectrometry","journal":"The protein journal","confidence":"Medium","confidence_rationale":"Tier 2 — MS-identified interactome; mechanistic conclusions require further validation","pmids":["20431927"],"is_preprint":false},{"year":2021,"finding":"DOT1L controls B cell differentiation by promoting a pro-proliferative, pro-germinal center (GC) transcriptional program and indirectly supporting repression of PRC2 targets (plasma cell differentiation program). B cells lacking Dot1L fail to establish germinal centers and show premature acquisition of plasma cell characteristics.","method":"Conditional Dot1L knockout in B cells; flow cytometry; combined epigenomics and transcriptomics; in vitro and in vivo differentiation assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — conditional KO + combined epigenomics/transcriptomics establishing mechanism","pmids":["33410591"],"is_preprint":false},{"year":2022,"finding":"DOT1L is required for transcription of major satellite repeats at pericentromeric heterochromatin in mouse ESCs and cleavage-stage embryos. H3K79me3 is selectively enriched over H3K79me2 at repetitive elements; DOT1L loss compromises pericentromeric satellite transcription and destabilizes heterochromatin structures, with possible coordination between DOT1L and chromatin remodeler SMARCA5.","method":"ChIP-seq distinguishing H3K79me2 and me3; DOT1L knockout in mESCs; pericentromeric transcript quantification; heterochromatin stability assays; preimplantation viability assay","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — KO + ChIP-seq + functional assays across multiple developmental contexts","pmids":["37317657"],"is_preprint":false},{"year":2021,"finding":"DOT1L promotes expression of Spleen tyrosine kinase (SYK) by increasing H3K79me2 modification at the SYK promoter in cardiac fibroblasts; this activates TGF-β1/Smad3 signaling to drive cardiac fibrosis. Inhibition of DOT1L reduces SYK transcription and ameliorates cardiac fibrosis in vitro and in vivo.","method":"ChIP-qPCR for H3K79me2 at SYK promoter; DOT1L knockdown/inhibition; SYK overexpression rescue; mouse myocardial infarction model","journal":"Human cell","confidence":"Medium","confidence_rationale":"Tier 2–3 — ChIP + rescue experiment establishing pathway; single lab","pmids":["34635982"],"is_preprint":false},{"year":2022,"finding":"DOT1L directly regulates macrophage lipid biosynthesis gene programs including SREBP1 and SREBP2. In myeloid-specific Dot1l-deficient mice, atherosclerotic plaque stability is reduced and inflammatory plaque macrophages are hyperactivated, establishing a role for DOT1L-mediated H3K79 methylation in macrophage lipid regulation.","method":"Selective DOT1L inhibitor in mouse and human macrophages; myeloid-specific Dot1l conditional knockout; RNA-seq; in vivo atherosclerosis model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — conditional KO + pharmacological inhibition + transcriptomic analysis with in vivo phenotype","pmids":["36417856"],"is_preprint":false},{"year":2017,"finding":"DOT1L in Xenopus functions as a coactivator for thyroid hormone receptor (TR). Overexpression of Dot1L enhances gene activation by TR in the presence of T3; endogenous Dot1L is critical for T3-induced activation of endogenous TR target genes in premetamorphic tadpoles, and transgenic Dot1L enhances TR function in vivo.","method":"Cotransfection studies; reconstituted frog oocyte in vivo transcription system; X. laevis transgenesis; X. tropicalis gene knockdown","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — complementary gain- and loss-of-function in vivo; ortholog in vertebrate model","pmids":["28739643"],"is_preprint":false},{"year":2018,"finding":"MLL1 and DOT1L cooperate to maintain expression of the Hoxa9/Meis1 gene expression program required for MN1-driven AML; deletion of either Mll1 or Dot1l abrogates this cell-of-origin gene expression program and blocks leukemogenesis. MN1hi/HOXA9hi human leukemias are sensitive to pharmacological DOT1L inhibition.","method":"Genetic inactivation of Dot1l or Mll1 in MN1-expressing cells; gene expression arrays; pharmacological DOT1L inhibition in human leukemia cells","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — clean genetic epistasis + pharmacological validation in human and mouse models","pmids":["26927674"],"is_preprint":false}],"current_model":"DOT1L is the sole histone methyltransferase responsible for mono-, di-, and trimethylation of lysine 79 on histone H3 (H3K79me1/2/3) within the structured nucleosome core, using SAM as cofactor; its catalytic activity is allosterically stimulated by H2B ubiquitylation (at K120 via direct ubiquitin-DOT1L contacts, or at K34 via nucleosome distortion) and by H4K16 acetylation, while H3T11 phosphorylation inhibits it; DOT1L is recruited to active genes through interactions with AF9/ENL (via a conserved 10-aa motif), AF10 (via a coiled-coil interaction stabilized by zinc), β-catenin/TCF4 complexes, Zc3h10, and the AF9 YEATS domain (which reads H3K9ac), where H3K79 methylation promotes transcription elongation and also has a catalytic-independent role in elongation; H3K79me marks active chromatin to facilitate DNA damage checkpoint signaling (by enabling 53BP1/Rad9 recruitment to double-strand breaks), global genomic repair (via XPC recruitment), and cell cycle progression, while its mislocalization via MLL fusion proteins drives leukemogenesis through aberrant HOXA gene activation."},"narrative":{"teleology":[{"year":2002,"claim":"The discovery that Dot1 methylates H3K79 in the nucleosome globular domain—and that this mark controls telomeric silencing by regulating Sir protein occupancy—established a new class of histone modification outside the N-terminal tails and linked it to chromatin domain organization.","evidence":"Genetic mutagenesis of H3K79 and Dot1 catalytic residues; mass spectrometry; ChIP of Sir proteins in S. cerevisiae","pmids":["12080090"],"confidence":"High","gaps":["Mechanism by which H3K79me excludes Sir proteins was unclear","Mammalian ortholog function not yet tested","Enzyme processivity and methylation state regulation unknown"]},{"year":2005,"claim":"Demonstration that H2B ubiquitylation controls the transition from H3K79 mono- to di/trimethylation—without affecting Dot1 recruitment—established trans-histone crosstalk as a processivity switch rather than a recruitment mechanism, and that H3K79me functions in DNA damage checkpoint activation upstream of Rad9/53BP1.","evidence":"ChIP, mass spectrometry, and Rad6-Bre1 pathway genetics in yeast; epistasis analysis of checkpoint kinases; human 53BP1 recruitment assays","pmids":["16039595","16166626","15632126"],"confidence":"High","gaps":["Structural basis of ubiquitin-Dot1 contact unknown","Whether H2Bub stimulation is conserved in mammals not resolved","Mechanism of 53BP1 tudor domain recognition of H3K79me not structurally defined"]},{"year":2008,"claim":"Genome-wide mapping in mammalian cells demonstrated that DOT1L is the sole H3K79 methyltransferase, is ubiquitously associated with active transcription, and preferentially occupies proximal coding regions—redefining H3K79me as a general mark of transcriptional activity rather than a silencing-specific modification.","evidence":"ChIP-chip tiling arrays in wild-type and Dot1l-null mouse fibroblasts","pmids":["18285465"],"confidence":"High","gaps":["Whether DOT1L has catalytic-independent transcriptional roles unknown","Context-specific gene regulatory programs not yet dissected"]},{"year":2010,"claim":"Purification of the DotCom complex revealed that DOT1L partners with MLL-fusion proteins (AF9, ENL, AF10, AF17) and Wnt signaling components (β-catenin, Skp1), and that DOT1L is recruited to Wnt target genes via β-catenin/TCF4-AF10 interaction to activate transcription—linking H3K79 methylation to a major developmental signaling pathway.","evidence":"Affinity purification/MS of DotCom; Drosophila Wingless RNAi; proteomics and ChIP in mouse intestinal crypts; zebrafish apc epistasis","pmids":["20203130","21103407","20431927"],"confidence":"High","gaps":["Structural basis of DOT1L-AF10 interaction not resolved","Relative contributions of individual complex members to targeting unclear"]},{"year":2011,"claim":"Conditional cardiac knockout showed DOT1L is required for Dystrophin transcription and heart function, while yeast Dot1 was shown to facilitate global genomic repair independently of checkpoint activation—demonstrating that H3K79me has tissue-specific transcriptional targets and distinct roles in DNA repair sub-pathways.","evidence":"Cardiac-specific Dot1L knockout with miniDmd rescue in mice; UV-induced NER assays and epistasis in yeast","pmids":["21289070","21460225"],"confidence":"High","gaps":["Whether DOT1L regulates cardiomyocyte gene networks beyond Dmd unknown","GGR chromatin docking factor for H3K79me not identified"]},{"year":2012,"claim":"Crystal structures of DOT1L with SAM-competitive inhibitors revealed a conformational adaptation mechanism in the active site that explains slow inhibitor dissociation kinetics and provided a template for drug design.","evidence":"X-ray crystallography with aminonucleoside inhibitors; enzyme kinetics","pmids":["22978415","23433670"],"confidence":"High","gaps":["No structure of DOT1L bound to nucleosome substrate yet","Catalytic mechanism of methyl transfer not fully resolved"]},{"year":2013,"claim":"Mapping of the DOT1L-AF9/ENL interaction to a 10-amino-acid motif essential for MLL-AF9-driven leukemic transformation, together with the finding that H3K79me activates the meiotic checkpoint kinase Mek1 via Hop1 redistribution, defined the molecular determinants of DOT1L recruitment in leukemogenesis and revealed a conserved checkpoint function in meiosis.","evidence":"Alanine scanning mutagenesis and biophysical binding assays; immortalization assays; meiotic checkpoint and Hop1/Pch2 localization in yeast","pmids":["23996074","23382701"],"confidence":"High","gaps":["Structural basis of DOT1L-AF9 interaction not yet solved","Whether meiotic checkpoint role is conserved in mammals unknown"]},{"year":2014,"claim":"The discovery that AF9's YEATS domain reads H3K9 acetylation and genome-wide co-localization of AF9 with H3K9ac directs DOT1L recruitment established a histone crosstalk cascade: H3K9ac → AF9 YEATS → DOT1L → H3K79me.","evidence":"Crystal structure of AF9 YEATS–H3K9ac peptide; ChIP-seq; mutagenesis","pmids":["25417107"],"confidence":"High","gaps":["Whether this recruitment mechanism is dominant over other targeting pathways unclear","Relative contribution of YEATS reading vs. other interaction modes not quantified"]},{"year":2016,"claim":"Quantitative proteomics and ChIP demonstrated that DOT1L-mediated H3K79me2 facilitates H4 acetylation and subsequent BRD4 binding at superenhancer-proximal genes, establishing a functional interdependence between DOT1L and BRD4 in transcription despite their residing in separate complexes.","evidence":"Quantitative proteomics; chemoproteomics; ChIP after pharmacological inhibition in MLL leukemia cells","pmids":["27294782"],"confidence":"High","gaps":["Mechanism by which H3K79me2 promotes H4 acetylation not identified","Generality beyond MLL leukemia contexts not tested"]},{"year":2018,"claim":"Crystal structures of the DOT1L-AF10 interface showed zinc-stabilized coiled-coil binding and that disruption of this interface blocks MLL-AF10 leukemogenesis; separately, DOT1L was shown to recruit XPC to UV damage sites for nucleotide excision repair, with melanoma-associated DOT1L mutations compromising this function.","evidence":"X-ray crystallography of DOT1L-AF10 complex; mutagenesis and transformation assays; ChIP of XPC at damage sites; Dot1L-knockout mice exposed to UV","pmids":["29563185","29343685"],"confidence":"High","gaps":["Whether DOT1L-AF10 disruption is therapeutically viable in patients unknown","Full spectrum of DOT1L mutations affecting NER not characterized"]},{"year":2019,"claim":"Cryo-EM of DOT1L on H2BK120ub nucleosomes provided the first structural view of how ubiquitin directly contacts DOT1L through complementary hydrophobic surfaces and how DOT1L engages the nucleosome acidic patch via an arginine anchor, giving the atomic-level mechanism for trans-histone crosstalk.","evidence":"Cryo-EM of reconstituted DOT1L–H2BK120ub nucleosome complex","pmids":["30759380"],"confidence":"High","gaps":["Dynamics of catalytic cycle on the nucleosome not captured","How multiple allosteric inputs (H4K16ac, H2Bub) integrate structurally unknown"]},{"year":2020,"claim":"A direct comparison of DOT1L knockout versus catalytically dead knock-in revealed a catalytic-independent role for DOT1L in transcription elongation and neural progenitor fate determination, separating the protein's scaffolding function from its enzymatic activity; concurrently, multiple conditional knockouts showed DOT1L controls T cell, brown adipocyte, and macrophage cell fate programs through locus-specific H3K79me deposition.","evidence":"KO vs catalytic-dead ESC models; super elongation complex inhibitor treatment; conditional Dot1L knockouts in T cells, brown fat (Ucp1-Cre), and myeloid cells; transcriptomics and epigenomics","pmids":["33077595","32764145","33107819","36417856"],"confidence":"High","gaps":["Mechanism of catalytic-independent elongation function unknown","How DOT1L achieves locus specificity in different lineages remains unclear","Whether scaffolding and enzymatic roles are separable in vivo at endogenous expression levels not tested"]},{"year":2021,"claim":"H4K16 acetylation was identified as a distinct allosteric activator of Dot1 that cooperates with but is mechanistically separable from H2Bub stimulation, while DOT1L was shown to be essential for germinal center B cell differentiation by supporting a pro-proliferative program and indirectly maintaining PRC2-mediated repression.","evidence":"In vitro reconstitution with defined histone modifications; ChIP in yeast H4K16 mutants; B cell-specific Dot1L conditional knockout with epigenomics","pmids":["33479126","33410591"],"confidence":"High","gaps":["Structural basis for H4K16ac allosteric activation not resolved","Whether H4K16ac stimulation is conserved in mammalian DOT1L not tested"]},{"year":2022,"claim":"Cryo-EM of Dot1L on H2BK34ub nucleosomes revealed a second, structurally distinct mechanism of ubiquitin-dependent activation—nucleosome distortion rather than direct protein contact—while tissue-specific studies showed DOT1L maintains spermatogonial stem cells via HoxC genes, regulates pericentromeric heterochromatin via H3K79me3 at satellite repeats, and controls context-specific cardiogenic gene networks including postnatal cell cycle withdrawal.","evidence":"Cryo-EM of H2BK34ub nucleosome ± Dot1L; conditional knockouts in germ cells, ESCs/embryos, and embryonic cardiomyocytes; ChIP-seq distinguishing H3K79me2/me3","pmids":["35739357","35738678","37317657","36460641"],"confidence":"High","gaps":["How H2BK34ub and H2BK120ub stimulation are coordinated in vivo unknown","Whether DOT1L has additional catalytic-independent roles in heterochromatin not tested","Upstream signals directing H3K79me2 vs me3 deposition at different loci unresolved"]},{"year":2022,"claim":"CBP-mediated acetylation of DOT1L at K358 was shown to prevent RNF8-dependent proteasomal degradation, establishing a post-translational regulatory axis that stabilizes DOT1L protein levels and promotes epithelial-mesenchymal transition via H3K79 methylation at SNAIL and ZEB1 promoters; concurrently, H3T11 phosphorylation by pyruvate kinase was identified as an inhibitory mark that reduces Dot1 chromatin binding and H3K79me3.","evidence":"MS identification of K358 acetylation; co-IP of RNF8-DOT1L; proteasome inhibitor experiments; in vitro methyltransferase assay with H3pT11 nucleosomes; ChIP in SESAME mutants","pmids":["32042335","36473858"],"confidence":"High","gaps":["Whether CBP-K358ac regulatory axis operates beyond colon cancer unknown","Deacetylase(s) that reverse K358ac not identified","Integration of H3T11ph inhibition with H2Bub/H4K16ac activation at individual loci not studied"]},{"year":null,"claim":"Key unresolved questions include how DOT1L achieves locus-specific methylation state outcomes (me1 vs me2 vs me3), the structural basis of its catalytic-independent role in transcription elongation, and whether the multiple allosteric inputs (H2BK120ub, H2BK34ub, H4K16ac, H3T11ph) are integrated simultaneously on single nucleosomes in vivo.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of DOT1L engaged with multiple allosteric marks simultaneously","Catalytic-independent scaffolding partners and mechanism undefined","Therapeutic window for DOT1L inhibition across non-leukemia contexts poorly defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,3,4,5,9,23,24]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0,16,23,24]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[7,18,20,25,26]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,3,13,14,33]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[12,16,33]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1,4,16,23,24,27]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,7,14,17,18,25,26]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[2,8,28]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[10,15,37]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[7,25,26]}],"complexes":["DotCom (DOT1L-AF9-ENL-AF10-AF17-β-catenin-Skp1-TRRAP)"],"partners":["AF9","ENL","AF10","CTNNB1","NPM1","ZC3H10","CBP","MYCN"],"other_free_text":[]},"mechanistic_narrative":"DOT1L is the sole histone H3 lysine 79 methyltransferase, catalyzing mono-, di-, and trimethylation of H3K79 within the nucleosome core to regulate transcription, DNA damage repair, and cell fate decisions across diverse lineages [PMID:12080090, PMID:18285465]. Its catalytic processivity is allosterically stimulated by H2B monoubiquitylation—via direct ubiquitin–DOT1L contacts at H2BK120 or via nucleosome distortion at H2BK34—and by H4K16 acetylation, while H3T11 phosphorylation inhibits chromatin binding [PMID:30759380, PMID:35739357, PMID:33479126, PMID:36473858]. DOT1L is recruited to target loci through interactions with AF9/ENL (via a conserved 10-residue motif), AF10 (via a zinc-stabilized coiled-coil interface), β-catenin/TCF4 complexes, and other transcription factors including Zc3h10 and nuclear receptors, and possesses a catalytic-independent scaffolding role in transcription elongation [PMID:23996074, PMID:29563185, PMID:21103407, PMID:33107819, PMID:33077595]. H3K79 methylation marks facilitate DNA damage checkpoint signaling by enabling 53BP1/Rad9 recruitment and nucleotide excision repair via XPC recruitment, while mislocalization of DOT1L by MLL-fusion oncoproteins drives aberrant HOXA gene activation and leukemogenesis [PMID:16166626, PMID:29343685, PMID:26927674]."},"prefetch_data":{"uniprot":{"accession":"Q8TEK3","full_name":"Histone-lysine N-methyltransferase, H3 lysine-79 specific","aliases":["DOT1-like protein","Disruptor of telomeric silencing 1-like histone lysine methyltransferase","Histone H3-K79 methyltransferase","H3-K79-HMTase","Lysine N-methyltransferase 4"],"length_aa":1537,"mass_kda":164.9,"function":"Histone methyltransferase that methylates 'Lys-79' of histone H3 (PubMed:12123582, PubMed:38503750, PubMed:38129415). Nucleosomes are preferred as substrate compared to free histones (PubMed:12123582, PubMed:38503750). Binds to DNA (PubMed:12628190, PubMed:38503750)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q8TEK3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DOT1L","classification":"Not Classified","n_dependent_lines":171,"n_total_lines":1208,"dependency_fraction":0.14155629139072848},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DOT1L","total_profiled":1310},"omim":[{"mim_id":"621265","title":"NIL-DESHWAR NEURODEVELOPMENTAL SYNDROME; NDNS","url":"https://www.omim.org/entry/621265"},{"mim_id":"615452","title":"PROSTATE CANCER-ASSOCIATED NONCODING RNA 1; PRNCR1","url":"https://www.omim.org/entry/615452"},{"mim_id":"607375","title":"DOT1-LIKE; DOT1L","url":"https://www.omim.org/entry/607375"},{"mim_id":"605443","title":"PCGEM1 PROSTATE-SPECIFIC TRANSCRIPT; PCGEM1","url":"https://www.omim.org/entry/605443"},{"mim_id":"605230","title":"TUMOR PROTEIN p53-BINDING PROTEIN 1; TP53BP1","url":"https://www.omim.org/entry/605230"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in 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Mutations abolishing Dot1 catalytic activity impair telomeric silencing, and dot1/H3-K79 mutations weaken the interaction of Sir2 and Sir3 with the telomeric region in vivo.\",\n      \"method\": \"Genetic mutagenesis of H3-K79 and Dot1 catalytic residues; in vivo chromatin immunoprecipitation of Sir proteins; biochemical identification of H3K79 methylation by mass spectrometry\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (mass spectrometry, mutagenesis, ChIP) in foundational paper, widely replicated\",\n      \"pmids\": [\"12080090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"H2B ubiquitylation at K123 is required for the transition from monomethylation to di- and trimethylation of H3K79 by Dot1 (processive methylation), but is dispensable for monomethylation. Dot1 binding to chromatin occurs normally in the absence of H2B-K123 ubiquitylation, indicating ubiquitylation regulates enzyme processivity rather than recruitment.\",\n      \"method\": \"Chromatin immunoprecipitation; mass spectrometry of histone modifications; genetic deletion of Rad6-Bre1 pathway components\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mass spectrometry + ChIP + genetics with clear mechanistic conclusion\",\n      \"pmids\": [\"16039595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Dot1-dependent H3K79 methylation is required for DNA damage checkpoint activation in yeast G1 and S phase. Loss of Dot1 prevents phosphorylation of the checkpoint adaptor Rad9 and activation of the Rad53 kinase after ionizing radiation, placing Dot1/H3K79me upstream of Rad9 in the checkpoint pathway. In human cells, H3K79 methylation by DOT1L mediates recruitment of 53BP1 via its paired tudor domains to double-strand breaks.\",\n      \"method\": \"Genetic deletion/mutagenesis; kinase phosphorylation assays; chromatin immunoprecipitation; epistasis analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis, biochemical phosphorylation assays, ChIP; replicated in companion paper (PMID:15632126)\",\n      \"pmids\": [\"16166626\", \"15632126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DOT1L is ubiquitously coupled with active transcription in mammalian cells; it preferentially occupies the proximal transcribed region of active genes correlating with H3K79 di- and trimethylation enrichment. Dot1l mutant fibroblasts lack H3K79 di- and trimethylation at all sites, establishing DOT1L as the sole enzyme responsible for these marks. H3K79 methylation levels dynamically respond to changes in gene activity.\",\n      \"method\": \"ChIP-chip tiling arrays; Dot1l mutant fibroblasts; genome-wide correlation of H3K79me with mRNA abundance\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP-chip plus genetic knockout establishing sole enzymatic responsibility\",\n      \"pmids\": [\"18285465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"H2B monoubiquitination at K123 is the critical determinant for H3K79 trimethylation by Dot1 in yeast, confirmed independently of strain background or epitope-tagged proteins.\",\n      \"method\": \"Genetic deletion of H2B-K123 ubiquitination pathway; histone alanine-scanning mutants; mass spectrometry of methylation states\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic reconstitution with rigorous controls to resolve prior controversy\",\n      \"pmids\": [\"19667127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DOT1L (Dot1l) is identified as part of a multisubunit DotCom complex including MLL fusion partners ENL, AF9/MLLT3, AF17/MLLT6, AF10/MLLT10, and Wnt pathway components TRRAP, Skp1, and β-catenin. The human DotCom complex trimethylates H3K79. Knockdown of Dot1 in Drosophila reduces Wingless target gene expression, and loss of H2B monoubiquitination (via Bre1 depletion) specifically reduces H3K79 trimethylation and Wingless target gene expression.\",\n      \"method\": \"Affinity purification/mass spectrometry of the complex; in vitro H3K79 trimethylation assay; Drosophila RNAi knockdown; genetic epistasis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — complex purified by MS, enzymatic activity confirmed in vitro, genetic validation in vivo\",\n      \"pmids\": [\"20203130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mllt10/AF10 and DOT1L are identified as TCF4/β-catenin interacting partners in mouse intestinal crypts. Mllt10/AF10-Dot1l are recruited to Wnt target genes in a β-catenin-dependent manner, resulting in H3K79 methylation over their coding regions. MLLT10/AF10 and DOT1L are essential activators of Wnt target gene regulation; depletion of Mllt10 and Dot1l in apc-mutant zebrafish rescues intestinal differentiation defects.\",\n      \"method\": \"Proteomics (co-IP/MS); chromatin immunoprecipitation; shRNA knockdown + expression arrays; zebrafish morpholino; genetic epistasis with apc\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, ChIP, genetic epistasis in multiple model systems\",\n      \"pmids\": [\"21103407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cardiac-specific knockout of Dot1L in mice causes dilated cardiomyopathy. Mechanistically, DOT1L regulates Dystrophin (Dmd) transcription and stability of the Dystrophin-glycoprotein complex; expression of a miniDmd rescues the cardiomyopathy phenotype, establishing Dmd as the major downstream target of DOT1L in cardiomyocytes.\",\n      \"method\": \"Conditional cardiac knockout mouse; gene expression analysis; miniDmd rescue experiment; Western blot for Dystrophin-glycoprotein complex\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined phenotype, rescue experiment establishes mechanistic pathway\",\n      \"pmids\": [\"21289070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Dot1 and H3K79 methylation (yeast) are required for global genomic repair (GGR) but not transcription-coupled repair (TCR) in nucleotide excision repair. Dot1/H3K79me facilitates GGR independently of checkpoint activation or regulation of Rad16 expression, suggesting methylated H3K79 serves as a docking site for the GGR machinery on chromatin.\",\n      \"method\": \"Genetic deletion of Dot1; UV-induced DNA damage repair assays in nucleosomal and linker DNA regions; epistasis with checkpoint and repair mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with clean pathway dissection, single lab\",\n      \"pmids\": [\"21460225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structures of DOT1L with aminonucleoside inhibitors reveal a conformational adaptation mechanism: high-affinity inhibitor binding induces a conformational change in DOT1L that also plays a role in natural SAM substrate interactions and enzyme turnover, explaining slow dissociation kinetics.\",\n      \"method\": \"X-ray crystallography; structure-activity relationship studies; enzyme kinetics (kon/koff measurement)\",\n      \"journal\": \"Chemical biology & drug design\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mechanistic interpretation and SAR validation\",\n      \"pmids\": [\"22978415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The AF9/ENL-binding site in human DOT1L was mapped to a 10-amino acid region (DOT1L865-874). Alanine scanning mutagenesis identified four conserved hydrophobic residues essential for interaction with AF9/ENL. The AF9/ENL-interacting site is essential for immortalization by MLL-AF9, establishing that DOT1L recruitment via this interaction is required for MLL-AF9-driven transformation.\",\n      \"method\": \"Biochemical mapping (alanine scanning mutagenesis); biophysical binding assays; functional immortalization assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mutagenesis + biophysical + functional validation; clear mechanistic conclusion\",\n      \"pmids\": [\"23996074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DOT1L crystal structure in complex with Bromo-deaza-SAH reveals that a halogen atom at the adenosine scaffold creates selective contacts with the DOT1L active site, explaining selectivity over other methyltransferases.\",\n      \"method\": \"X-ray crystallography; enzyme inhibition assays\",\n      \"journal\": \"Bioorganic & medicinal chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with biochemical validation\",\n      \"pmids\": [\"23433670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dot1-dependent H3K79 methylation activates the meiotic checkpoint effector Mek1 kinase by promoting Hop1 activation and proper distribution along meiotic chromosomes; Dot1 is required for Mek1 autophosphorylation but not Mec1/Tel1-dependent phosphorylation. H3K79me excludes Pch2 from chromosomes, enabling Hop1 localization along chromosome axes.\",\n      \"method\": \"Genetic analysis of dot1 deletion and H3-K79 mutants; meiotic checkpoint assays; Mek1 phosphorylation assays; Hop1 and Pch2 localization by microscopy\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic and biochemical assays establishing pathway mechanism\",\n      \"pmids\": [\"23382701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The AF9 YEATS domain binds H3K9 acetylation (and to lesser extent H3K27ac and H3K18ac). Crystal structural studies reveal an eight-stranded immunoglobulin fold with a serine-lined aromatic sandwiching cage for acetyllysine recognition. Genome-wide colocalization of AF9 and H3K9ac is important for chromatin recruitment of the H3K79 methyltransferase DOT1L, establishing a direct link between histone acetylation and DOT1L-mediated H3K79 methylation.\",\n      \"method\": \"Crystal structure of AF9 YEATS with acetyl-H3K9 peptide; ChIP-seq; mutagenesis; in vitro binding assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure + ChIP-seq + mutagenesis establishing mechanism of DOT1L recruitment\",\n      \"pmids\": [\"25417107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BRD4 and DOT1L exist in separate protein complexes in cells but show functional interdependence at MLL leukemia genes. DOT1L, via dimethylated H3K79, facilitates histone H4 acetylation, which in turn regulates BRD4 binding to chromatin. This functional collaboration is especially important at highly transcribed genes near superenhancers.\",\n      \"method\": \"Quantitative proteomics; chemoproteomics; biochemical fractionation; genetic disruption; small-molecule inhibition; ChIP\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — quantitative proteomics + ChIP + genetic/pharmacological perturbations establishing mechanistic cross-talk\",\n      \"pmids\": [\"27294782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structures of DOT1L-AF10 complex reveal that AF10 octapeptide motif leucine zipper (OM-LZ) directly binds the coiled-coil domain of DOT1L. Zinc stabilizes the DOT1L-AF10 complex. Disruption of the DOT1L-AF10 interface abrogates MLL-AF10-associated leukemic transformation.\",\n      \"method\": \"X-ray crystallography of apo AF10OM-LZ and DOT1L-AF10 complex; mutagenesis of interface residues; functional leukemic transformation assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure + mutagenesis + functional validation\",\n      \"pmids\": [\"29563185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Cryo-EM structure of DOT1L bound to a nucleosome with site-specifically ubiquitylated H2BK120 shows that DOT1L engages the nucleosome acidic patch using a variant arginine anchor and occupies a conformation poised for methylation. DOT1L and H2BK120-linked ubiquitin interact directly through complementary hydrophobic surfaces, providing the structural basis for trans-histone crosstalk activation of DOT1L.\",\n      \"method\": \"Cryo-electron microscopy (cryo-EM) structure of DOT1L-ubiquitylated nucleosome complex; site-specific ubiquitylation reconstitution\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure with reconstituted ubiquitylated nucleosome providing direct structural mechanism\",\n      \"pmids\": [\"30759380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DOT1L co-localizes with estrogen receptor α (ERα) in breast cancer cell chromatin to regulate estrogen target gene transcription. DOT1L blockade reduces H3K79 methylation and suppresses ERα and FOXA1 gene expression, providing a mechanism for DOT1L's role in breast cancer cell proliferation.\",\n      \"method\": \"ChIP-seq colocalization; siRNA knockdown; pharmacological inhibition (EPZ5676); gene expression analysis; xenograft model\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq + genetic/pharmacological KD with defined phenotype; single lab\",\n      \"pmids\": [\"30775443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOT1L has a catalytic-independent role in promoting productive transcription elongation: DOT1L loss (but not catalytic inactivation) exacerbates transcription elongation defects caused by super elongation complex inhibition, establishing that DOT1L's role in elongation is distinct from its H3K79 methylation activity. DOT1L loss (but not catalytic inactivation) is also required for neural progenitor cell fate determination.\",\n      \"method\": \"DOT1L knockout vs catalytically dead DOT1L knock-in ESC models; transcriptome analysis; super elongation complex inhibitor treatment; neural progenitor differentiation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct comparison of KO vs catalytic dead allele with multiple functional readouts\",\n      \"pmids\": [\"33077595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOT1L controls CD8+ T cell differentiation by ensuring normal T cell receptor density and signaling, and maintains epigenetic identity by indirectly supporting repression of developmentally regulated genes. T cell-specific Dot1L ablation causes loss of naïve CD8+ T cells and premature differentiation toward a memory-like state in a cell-intrinsic manner.\",\n      \"method\": \"T cell-specific conditional Dot1L knockout; flow cytometry; TCR signaling assays; epigenomic and transcriptomic analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined cellular phenotype and mechanistic TCR signaling analysis\",\n      \"pmids\": [\"32764145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOT1L interacts with Zc3h10 transcription factor and is recruited by Zc3h10 to promoter regions of thermogenic genes (including Ucp1) in brown adipose tissue, where it methylates H3K79 to function as a coactivator. DOT1L ablation in brown fat (Ucp1-Cre) prevents Ucp1 activation and reduces thermogenic capacity, promoting adiposity.\",\n      \"method\": \"Co-immunoprecipitation; ChIP; conditional Dot1L knockout (Ucp1-Cre); thermogenic gene expression and energy expenditure assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP establishing direct interaction, ChIP showing recruitment, in vivo conditional KO with functional phenotype\",\n      \"pmids\": [\"33107819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOT1L inhibition in prostate cancer cells leads to reduced MYC expression and upregulation of MYC-regulated E3 ubiquitin ligases HECTD4 and MYCBP2, which promote AR and MYC protein degradation. A distal H3K79 methylation-marked enhancer in the MYC gene is bound by both AR and DOT1L in AR-positive cells.\",\n      \"method\": \"Genetic and chemical inhibition of DOT1L; ChIP; co-immunoprecipitation; ubiquitin ligase functional assays; organoids\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + genetic KD with defined mechanistic pathway; single lab\",\n      \"pmids\": [\"32814769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CBP mediates DOT1L K358 acetylation in colon cancer cells. This acetylation prevents RNF8 binding to DOT1L and subsequent proteasomal degradation, thereby stabilizing DOT1L without affecting its enzymatic activity. Stabilized DOT1L then catalyzes H3K79 methylation of SNAIL and ZEB1 gene promoters to promote epithelial-mesenchymal transition and metastasis.\",\n      \"method\": \"Affinity purification and mass spectrometry identifying acetylation; co-immunoprecipitation of RNF8-DOT1L; proteasome inhibitor assays; ChIP; acetylation mimic mutant; in vivo metastasis model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — MS identification of modification + biochemical validation of writer (CBP)/eraser pathway + mechanistic consequences\",\n      \"pmids\": [\"32042335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"H4K16 acetylation allosterically stimulates yeast Dot1 H3K79 methyltransferase activity in a manner distinct from but coordinating with H2B ubiquitination (H2BUb). H4K16ac specifically (not other H4 acetylations) and H2BUb play crucial roles in H3K79 di- and trimethylation in vitro and in vivo.\",\n      \"method\": \"In vitro reconstitution methyltransferase assay with defined histone modifications; mutagenesis; ChIP in yeast mutants\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution + mutagenesis + in vivo ChIP establishing allosteric mechanism\",\n      \"pmids\": [\"33479126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of Dot1L bound to a H2BK34ub nucleosome reveal that H2BK34-anchored ubiquitin does not directly contact Dot1L (unlike H2BK120ub), but instead induces DNA and histone distortion around the modified site, positioning Dot1L in a productive conformation. This establishes nucleosome distortion as a distinct mechanism for ubiquitination-dependent activation of Dot1L.\",\n      \"method\": \"Cryo-EM structure of Dot1L-H2BK34ub nucleosome and H2BK34ub nucleosome alone; site-specific ubiquitylation; in vitro methyltransferase assay\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — dual cryo-EM structures with reconstituted ubiquitylated nucleosome and enzymatic validation\",\n      \"pmids\": [\"35739357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"H3K79me2 regulates highly specific transcriptional networks during cardiogenesis rather than acting as a general transcriptional activator. H3K79me2 in gene bodies and regulatory elements synergize to promote gene activation, and H3K79me2 at specific regulatory elements also contributes to silencing of genes not normally expressed in cardiomyocytes. DOT1L is particularly important for left ventricle-specific genes and postnatal cardiomyocyte cell cycle withdrawal.\",\n      \"method\": \"Embryonic cardiomyocyte-specific Dot1L conditional knockout; H3K79me2 ChIP-seq; RNA-seq; analysis of mononuclear cardiomyocytes\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO + genome-wide ChIP-seq revealing context-specific mechanism\",\n      \"pmids\": [\"36460641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DOT1L maintains spermatogonial stem cell self-renewal by promoting expression of fate-determining HoxC transcription factors; H3K79me2 accumulates at HoxC9 and HoxC10 gene loci. Mice lacking DOT1L fail to maintain spermatogonial stem cells, leading to progressive loss of germ cells and Sertoli cell-only syndrome.\",\n      \"method\": \"Conditional Dot1L knockout; transplantation assay; H3K79me2 ChIP; gene expression analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO + transplantation + ChIP establishing mechanistic pathway\",\n      \"pmids\": [\"35738678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"H3T11 phosphorylation by the SESAME complex (pyruvate kinase Pyk1) directly inhibits Dot1-catalyzed H3K79 trimethylation by reducing Dot1 binding to chromatin. This crosstalk regulates autophagy gene transcription and telomere silencing; H3pT11 and H3K79me3 work together to promote SIR complex binding at telomeres.\",\n      \"method\": \"In vitro methyltransferase assay; ChIP; genetic analysis of SESAME/Pyk1 and Dot1 mutants; autophagy assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro reconstitution + genetics + ChIP establishing cross-talk mechanism\",\n      \"pmids\": [\"36473858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DOT1L facilitates nucleotide excision repair (NER) of UV-induced DNA damage by methylating H3K79, with H3K79-methylated chromatin recruiting the XPC damage recognition factor to DNA damage sites for NER. DOT1L mutations in melanoma functionally compromise methyltransferase enzyme activity leading to reduced H3K79 methylation and impaired UV-induced DNA damage repair.\",\n      \"method\": \"Functional methyltransferase assay of DOT1L mutants; ChIP of XPC at damage sites; Dot1L knockout mouse + UVR exposure; NER assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — enzymatic assay of mutations + ChIP + in vivo mouse model establishing mechanism\",\n      \"pmids\": [\"29343685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The lncRNA LAMP5-AS1 directly binds the lysine-rich region of the DOT1L catalytic domain and facilitates its methyltransferase activity, promoting global H3K79 dimethylation and trimethylation in MLL leukemia cells, leading to upregulated HOXA cluster gene expression.\",\n      \"method\": \"RNA electrophoretic mobility shift assay (EMSA); in vitro histone methyltransferase assay; RNA pulldown; RNA FISH; ChIP\",\n      \"journal\": \"Journal of hematology & oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding EMSA + in vitro enzymatic assay; single lab\",\n      \"pmids\": [\"32552847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"N-Myc upregulates DOT1L mRNA and protein by binding to the DOT1L gene promoter. DOT1L protein binds to the Myc Box II domain of N-Myc protein and knockdown of DOT1L reduces H3K79 methylation and N-Myc binding at target gene promoters, establishing DOT1L as a cofactor in N-Myc-mediated transcriptional activation.\",\n      \"method\": \"ChIP at DOT1L promoter; co-immunoprecipitation of DOT1L-N-Myc; shRNA knockdown; ChIP at target promoters; xenograft model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — co-IP + ChIP establishing interaction and functional consequence; single lab\",\n      \"pmids\": [\"28209620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The DOT1L-containing complex purified by tandem affinity purification contains AF9, ENL, and NPM1 as major interacting proteins. The network suggests DOT1L controls AF9- and ENL-mediated transcription and may function as a histone chaperone in an NPM1-dependent manner.\",\n      \"method\": \"Tandem affinity purification; mass spectrometry\",\n      \"journal\": \"The protein journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS-identified interactome; mechanistic conclusions require further validation\",\n      \"pmids\": [\"20431927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOT1L controls B cell differentiation by promoting a pro-proliferative, pro-germinal center (GC) transcriptional program and indirectly supporting repression of PRC2 targets (plasma cell differentiation program). B cells lacking Dot1L fail to establish germinal centers and show premature acquisition of plasma cell characteristics.\",\n      \"method\": \"Conditional Dot1L knockout in B cells; flow cytometry; combined epigenomics and transcriptomics; in vitro and in vivo differentiation assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO + combined epigenomics/transcriptomics establishing mechanism\",\n      \"pmids\": [\"33410591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DOT1L is required for transcription of major satellite repeats at pericentromeric heterochromatin in mouse ESCs and cleavage-stage embryos. H3K79me3 is selectively enriched over H3K79me2 at repetitive elements; DOT1L loss compromises pericentromeric satellite transcription and destabilizes heterochromatin structures, with possible coordination between DOT1L and chromatin remodeler SMARCA5.\",\n      \"method\": \"ChIP-seq distinguishing H3K79me2 and me3; DOT1L knockout in mESCs; pericentromeric transcript quantification; heterochromatin stability assays; preimplantation viability assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO + ChIP-seq + functional assays across multiple developmental contexts\",\n      \"pmids\": [\"37317657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOT1L promotes expression of Spleen tyrosine kinase (SYK) by increasing H3K79me2 modification at the SYK promoter in cardiac fibroblasts; this activates TGF-β1/Smad3 signaling to drive cardiac fibrosis. Inhibition of DOT1L reduces SYK transcription and ameliorates cardiac fibrosis in vitro and in vivo.\",\n      \"method\": \"ChIP-qPCR for H3K79me2 at SYK promoter; DOT1L knockdown/inhibition; SYK overexpression rescue; mouse myocardial infarction model\",\n      \"journal\": \"Human cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — ChIP + rescue experiment establishing pathway; single lab\",\n      \"pmids\": [\"34635982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DOT1L directly regulates macrophage lipid biosynthesis gene programs including SREBP1 and SREBP2. In myeloid-specific Dot1l-deficient mice, atherosclerotic plaque stability is reduced and inflammatory plaque macrophages are hyperactivated, establishing a role for DOT1L-mediated H3K79 methylation in macrophage lipid regulation.\",\n      \"method\": \"Selective DOT1L inhibitor in mouse and human macrophages; myeloid-specific Dot1l conditional knockout; RNA-seq; in vivo atherosclerosis model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO + pharmacological inhibition + transcriptomic analysis with in vivo phenotype\",\n      \"pmids\": [\"36417856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DOT1L in Xenopus functions as a coactivator for thyroid hormone receptor (TR). Overexpression of Dot1L enhances gene activation by TR in the presence of T3; endogenous Dot1L is critical for T3-induced activation of endogenous TR target genes in premetamorphic tadpoles, and transgenic Dot1L enhances TR function in vivo.\",\n      \"method\": \"Cotransfection studies; reconstituted frog oocyte in vivo transcription system; X. laevis transgenesis; X. tropicalis gene knockdown\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — complementary gain- and loss-of-function in vivo; ortholog in vertebrate model\",\n      \"pmids\": [\"28739643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MLL1 and DOT1L cooperate to maintain expression of the Hoxa9/Meis1 gene expression program required for MN1-driven AML; deletion of either Mll1 or Dot1l abrogates this cell-of-origin gene expression program and blocks leukemogenesis. MN1hi/HOXA9hi human leukemias are sensitive to pharmacological DOT1L inhibition.\",\n      \"method\": \"Genetic inactivation of Dot1l or Mll1 in MN1-expressing cells; gene expression arrays; pharmacological DOT1L inhibition in human leukemia cells\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic epistasis + pharmacological validation in human and mouse models\",\n      \"pmids\": [\"26927674\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DOT1L is the sole histone methyltransferase responsible for mono-, di-, and trimethylation of lysine 79 on histone H3 (H3K79me1/2/3) within the structured nucleosome core, using SAM as cofactor; its catalytic activity is allosterically stimulated by H2B ubiquitylation (at K120 via direct ubiquitin-DOT1L contacts, or at K34 via nucleosome distortion) and by H4K16 acetylation, while H3T11 phosphorylation inhibits it; DOT1L is recruited to active genes through interactions with AF9/ENL (via a conserved 10-aa motif), AF10 (via a coiled-coil interaction stabilized by zinc), β-catenin/TCF4 complexes, Zc3h10, and the AF9 YEATS domain (which reads H3K9ac), where H3K79 methylation promotes transcription elongation and also has a catalytic-independent role in elongation; H3K79me marks active chromatin to facilitate DNA damage checkpoint signaling (by enabling 53BP1/Rad9 recruitment to double-strand breaks), global genomic repair (via XPC recruitment), and cell cycle progression, while its mislocalization via MLL fusion proteins drives leukemogenesis through aberrant HOXA gene activation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DOT1L is the sole histone H3 lysine 79 methyltransferase, catalyzing mono-, di-, and trimethylation of H3K79 within the nucleosome core to regulate transcription, DNA damage repair, and cell fate decisions across diverse lineages [PMID:12080090, PMID:18285465]. Its catalytic processivity is allosterically stimulated by H2B monoubiquitylation—via direct ubiquitin–DOT1L contacts at H2BK120 or via nucleosome distortion at H2BK34—and by H4K16 acetylation, while H3T11 phosphorylation inhibits chromatin binding [PMID:30759380, PMID:35739357, PMID:33479126, PMID:36473858]. DOT1L is recruited to target loci through interactions with AF9/ENL (via a conserved 10-residue motif), AF10 (via a zinc-stabilized coiled-coil interface), β-catenin/TCF4 complexes, and other transcription factors including Zc3h10 and nuclear receptors, and possesses a catalytic-independent scaffolding role in transcription elongation [PMID:23996074, PMID:29563185, PMID:21103407, PMID:33107819, PMID:33077595]. H3K79 methylation marks facilitate DNA damage checkpoint signaling by enabling 53BP1/Rad9 recruitment and nucleotide excision repair via XPC recruitment, while mislocalization of DOT1L by MLL-fusion oncoproteins drives aberrant HOXA gene activation and leukemogenesis [PMID:16166626, PMID:29343685, PMID:26927674].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"The discovery that Dot1 methylates H3K79 in the nucleosome globular domain—and that this mark controls telomeric silencing by regulating Sir protein occupancy—established a new class of histone modification outside the N-terminal tails and linked it to chromatin domain organization.\",\n      \"evidence\": \"Genetic mutagenesis of H3K79 and Dot1 catalytic residues; mass spectrometry; ChIP of Sir proteins in S. cerevisiae\",\n      \"pmids\": [\"12080090\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which H3K79me excludes Sir proteins was unclear\", \"Mammalian ortholog function not yet tested\", \"Enzyme processivity and methylation state regulation unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstration that H2B ubiquitylation controls the transition from H3K79 mono- to di/trimethylation—without affecting Dot1 recruitment—established trans-histone crosstalk as a processivity switch rather than a recruitment mechanism, and that H3K79me functions in DNA damage checkpoint activation upstream of Rad9/53BP1.\",\n      \"evidence\": \"ChIP, mass spectrometry, and Rad6-Bre1 pathway genetics in yeast; epistasis analysis of checkpoint kinases; human 53BP1 recruitment assays\",\n      \"pmids\": [\"16039595\", \"16166626\", \"15632126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ubiquitin-Dot1 contact unknown\", \"Whether H2Bub stimulation is conserved in mammals not resolved\", \"Mechanism of 53BP1 tudor domain recognition of H3K79me not structurally defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genome-wide mapping in mammalian cells demonstrated that DOT1L is the sole H3K79 methyltransferase, is ubiquitously associated with active transcription, and preferentially occupies proximal coding regions—redefining H3K79me as a general mark of transcriptional activity rather than a silencing-specific modification.\",\n      \"evidence\": \"ChIP-chip tiling arrays in wild-type and Dot1l-null mouse fibroblasts\",\n      \"pmids\": [\"18285465\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DOT1L has catalytic-independent transcriptional roles unknown\", \"Context-specific gene regulatory programs not yet dissected\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Purification of the DotCom complex revealed that DOT1L partners with MLL-fusion proteins (AF9, ENL, AF10, AF17) and Wnt signaling components (β-catenin, Skp1), and that DOT1L is recruited to Wnt target genes via β-catenin/TCF4-AF10 interaction to activate transcription—linking H3K79 methylation to a major developmental signaling pathway.\",\n      \"evidence\": \"Affinity purification/MS of DotCom; Drosophila Wingless RNAi; proteomics and ChIP in mouse intestinal crypts; zebrafish apc epistasis\",\n      \"pmids\": [\"20203130\", \"21103407\", \"20431927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DOT1L-AF10 interaction not resolved\", \"Relative contributions of individual complex members to targeting unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Conditional cardiac knockout showed DOT1L is required for Dystrophin transcription and heart function, while yeast Dot1 was shown to facilitate global genomic repair independently of checkpoint activation—demonstrating that H3K79me has tissue-specific transcriptional targets and distinct roles in DNA repair sub-pathways.\",\n      \"evidence\": \"Cardiac-specific Dot1L knockout with miniDmd rescue in mice; UV-induced NER assays and epistasis in yeast\",\n      \"pmids\": [\"21289070\", \"21460225\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DOT1L regulates cardiomyocyte gene networks beyond Dmd unknown\", \"GGR chromatin docking factor for H3K79me not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Crystal structures of DOT1L with SAM-competitive inhibitors revealed a conformational adaptation mechanism in the active site that explains slow inhibitor dissociation kinetics and provided a template for drug design.\",\n      \"evidence\": \"X-ray crystallography with aminonucleoside inhibitors; enzyme kinetics\",\n      \"pmids\": [\"22978415\", \"23433670\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of DOT1L bound to nucleosome substrate yet\", \"Catalytic mechanism of methyl transfer not fully resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapping of the DOT1L-AF9/ENL interaction to a 10-amino-acid motif essential for MLL-AF9-driven leukemic transformation, together with the finding that H3K79me activates the meiotic checkpoint kinase Mek1 via Hop1 redistribution, defined the molecular determinants of DOT1L recruitment in leukemogenesis and revealed a conserved checkpoint function in meiosis.\",\n      \"evidence\": \"Alanine scanning mutagenesis and biophysical binding assays; immortalization assays; meiotic checkpoint and Hop1/Pch2 localization in yeast\",\n      \"pmids\": [\"23996074\", \"23382701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DOT1L-AF9 interaction not yet solved\", \"Whether meiotic checkpoint role is conserved in mammals unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The discovery that AF9's YEATS domain reads H3K9 acetylation and genome-wide co-localization of AF9 with H3K9ac directs DOT1L recruitment established a histone crosstalk cascade: H3K9ac → AF9 YEATS → DOT1L → H3K79me.\",\n      \"evidence\": \"Crystal structure of AF9 YEATS–H3K9ac peptide; ChIP-seq; mutagenesis\",\n      \"pmids\": [\"25417107\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this recruitment mechanism is dominant over other targeting pathways unclear\", \"Relative contribution of YEATS reading vs. other interaction modes not quantified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Quantitative proteomics and ChIP demonstrated that DOT1L-mediated H3K79me2 facilitates H4 acetylation and subsequent BRD4 binding at superenhancer-proximal genes, establishing a functional interdependence between DOT1L and BRD4 in transcription despite their residing in separate complexes.\",\n      \"evidence\": \"Quantitative proteomics; chemoproteomics; ChIP after pharmacological inhibition in MLL leukemia cells\",\n      \"pmids\": [\"27294782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which H3K79me2 promotes H4 acetylation not identified\", \"Generality beyond MLL leukemia contexts not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Crystal structures of the DOT1L-AF10 interface showed zinc-stabilized coiled-coil binding and that disruption of this interface blocks MLL-AF10 leukemogenesis; separately, DOT1L was shown to recruit XPC to UV damage sites for nucleotide excision repair, with melanoma-associated DOT1L mutations compromising this function.\",\n      \"evidence\": \"X-ray crystallography of DOT1L-AF10 complex; mutagenesis and transformation assays; ChIP of XPC at damage sites; Dot1L-knockout mice exposed to UV\",\n      \"pmids\": [\"29563185\", \"29343685\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DOT1L-AF10 disruption is therapeutically viable in patients unknown\", \"Full spectrum of DOT1L mutations affecting NER not characterized\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Cryo-EM of DOT1L on H2BK120ub nucleosomes provided the first structural view of how ubiquitin directly contacts DOT1L through complementary hydrophobic surfaces and how DOT1L engages the nucleosome acidic patch via an arginine anchor, giving the atomic-level mechanism for trans-histone crosstalk.\",\n      \"evidence\": \"Cryo-EM of reconstituted DOT1L–H2BK120ub nucleosome complex\",\n      \"pmids\": [\"30759380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of catalytic cycle on the nucleosome not captured\", \"How multiple allosteric inputs (H4K16ac, H2Bub) integrate structurally unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A direct comparison of DOT1L knockout versus catalytically dead knock-in revealed a catalytic-independent role for DOT1L in transcription elongation and neural progenitor fate determination, separating the protein's scaffolding function from its enzymatic activity; concurrently, multiple conditional knockouts showed DOT1L controls T cell, brown adipocyte, and macrophage cell fate programs through locus-specific H3K79me deposition.\",\n      \"evidence\": \"KO vs catalytic-dead ESC models; super elongation complex inhibitor treatment; conditional Dot1L knockouts in T cells, brown fat (Ucp1-Cre), and myeloid cells; transcriptomics and epigenomics\",\n      \"pmids\": [\"33077595\", \"32764145\", \"33107819\", \"36417856\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of catalytic-independent elongation function unknown\", \"How DOT1L achieves locus specificity in different lineages remains unclear\", \"Whether scaffolding and enzymatic roles are separable in vivo at endogenous expression levels not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"H4K16 acetylation was identified as a distinct allosteric activator of Dot1 that cooperates with but is mechanistically separable from H2Bub stimulation, while DOT1L was shown to be essential for germinal center B cell differentiation by supporting a pro-proliferative program and indirectly maintaining PRC2-mediated repression.\",\n      \"evidence\": \"In vitro reconstitution with defined histone modifications; ChIP in yeast H4K16 mutants; B cell-specific Dot1L conditional knockout with epigenomics\",\n      \"pmids\": [\"33479126\", \"33410591\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for H4K16ac allosteric activation not resolved\", \"Whether H4K16ac stimulation is conserved in mammalian DOT1L not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Cryo-EM of Dot1L on H2BK34ub nucleosomes revealed a second, structurally distinct mechanism of ubiquitin-dependent activation—nucleosome distortion rather than direct protein contact—while tissue-specific studies showed DOT1L maintains spermatogonial stem cells via HoxC genes, regulates pericentromeric heterochromatin via H3K79me3 at satellite repeats, and controls context-specific cardiogenic gene networks including postnatal cell cycle withdrawal.\",\n      \"evidence\": \"Cryo-EM of H2BK34ub nucleosome ± Dot1L; conditional knockouts in germ cells, ESCs/embryos, and embryonic cardiomyocytes; ChIP-seq distinguishing H3K79me2/me3\",\n      \"pmids\": [\"35739357\", \"35738678\", \"37317657\", \"36460641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How H2BK34ub and H2BK120ub stimulation are coordinated in vivo unknown\", \"Whether DOT1L has additional catalytic-independent roles in heterochromatin not tested\", \"Upstream signals directing H3K79me2 vs me3 deposition at different loci unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"CBP-mediated acetylation of DOT1L at K358 was shown to prevent RNF8-dependent proteasomal degradation, establishing a post-translational regulatory axis that stabilizes DOT1L protein levels and promotes epithelial-mesenchymal transition via H3K79 methylation at SNAIL and ZEB1 promoters; concurrently, H3T11 phosphorylation by pyruvate kinase was identified as an inhibitory mark that reduces Dot1 chromatin binding and H3K79me3.\",\n      \"evidence\": \"MS identification of K358 acetylation; co-IP of RNF8-DOT1L; proteasome inhibitor experiments; in vitro methyltransferase assay with H3pT11 nucleosomes; ChIP in SESAME mutants\",\n      \"pmids\": [\"32042335\", \"36473858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CBP-K358ac regulatory axis operates beyond colon cancer unknown\", \"Deacetylase(s) that reverse K358ac not identified\", \"Integration of H3T11ph inhibition with H2Bub/H4K16ac activation at individual loci not studied\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how DOT1L achieves locus-specific methylation state outcomes (me1 vs me2 vs me3), the structural basis of its catalytic-independent role in transcription elongation, and whether the multiple allosteric inputs (H2BK120ub, H2BK34ub, H4K16ac, H3T11ph) are integrated simultaneously on single nucleosomes in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of DOT1L engaged with multiple allosteric marks simultaneously\", \"Catalytic-independent scaffolding partners and mechanism undefined\", \"Therapeutic window for DOT1L inhibition across non-leukemia contexts poorly defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 3, 4, 5, 9, 23, 24]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 16, 23, 24]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [7, 18, 20, 25, 26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3, 13, 14, 33]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [12, 16, 33]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1, 4, 16, 23, 24, 27]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 7, 14, 17, 18, 25, 26]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [2, 8, 28]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [10, 15, 37]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7, 25, 26]}\n    ],\n    \"complexes\": [\n      \"DotCom (DOT1L-AF9-ENL-AF10-AF17-β-catenin-Skp1-TRRAP)\"\n    ],\n    \"partners\": [\n      \"AF9\",\n      \"ENL\",\n      \"AF10\",\n      \"CTNNB1\",\n      \"NPM1\",\n      \"ZC3H10\",\n      \"CBP\",\n      \"MYCN\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}