{"gene":"DOT1L","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2002,"finding":"Dot1 (yeast ortholog of DOT1L) methylates lysine 79 of histone H3 within the globular domain of the nucleosome, not the tail. Mutations abolishing Dot1 catalytic activity impair telomeric silencing, and this correlates with weakened interaction of Sir2 and Sir3 with telomeric regions in vivo, establishing H3K79 methylation as the mechanism by which Dot1 mediates telomeric silencing.","method":"In vivo mutagenesis of H3-K79 and Dot1 catalytic residues; Sir protein ChIP; telomeric silencing reporter assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — active-site mutagenesis combined with in vivo ChIP and functional silencing assays; foundational study replicated widely","pmids":["12080090"],"is_preprint":false},{"year":2000,"finding":"Yeast Dot1 is required for meiotic pachytene checkpoint function: in dot1 mutants, synapsis-defective (zip1, dmc1) cells bypass the checkpoint and produce inviable meiotic products. Dot1 is also required for proper nucleolar concentration of checkpoint proteins Pch2 and Sir2, and for preventing sister-chromatid repair by the Rad54 pathway during meiosis.","method":"Genetic deletion of DOT1; meiotic progression assays; fluorescence microscopy of Pch2/Sir2 localization","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic deletion with specific meiotic checkpoint and localization phenotypes; replicated in subsequent studies","pmids":["11029058"],"is_preprint":false},{"year":2005,"finding":"Dot1-dependent H3K79 methylation is required for DNA damage checkpoint activation in S. cerevisiae: loss of H3K79 methylation does not affect Mec1 activation but prevents phosphorylation of the checkpoint adaptor Rad9, thereby blocking Rad53 kinase activation and causing checkpoint deficiency.","method":"Genetic deletion/mutation of DOT1, H3-K79, H2B-K123; Rad53 kinase phosphorylation assays; cell cycle arrest assays after genotoxic stress","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis with specific checkpoint kinase readout, corroborated by parallel study (PMID:16166626)","pmids":["15632126","16166626"],"is_preprint":false},{"year":2005,"finding":"Dot1/H3K79 methylation mediates G1 and intra-S phase checkpoint activation after ionizing radiation by enabling Rad9 (yeast 53BP1 ortholog) binding to double-strand break sites via its Tudor domain; Tudor domain mutations in Rad9 that abrogate methylated K79 binding phenocopy dot1 deletion and block Rad53 phosphorylation. In human cells, DOT1L-mediated H3K79 methylation similarly mediates 53BP1 recruitment to DSBs via its paired Tudor domains.","method":"Genetic screen; Rad9 Tudor domain mutagenesis; Rad53 phosphorylation assays; ChIP for Rad9 at DSBs","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Tudor domain mutagenesis with specific checkpoint kinase phenotypes; validated in both yeast and human cell contexts","pmids":["16166626"],"is_preprint":false},{"year":2007,"finding":"Dot1 requires the basic patch residues R17-H18-R19 of the histone H4 N-terminal tail for H3K79 methyltransferase activity in vitro and in vivo. Dot1 physically interacts with the H4 tail via its own C-terminal acidic patch. This defines a novel trans-histone pathway whereby H4 tail charge is required for modification of H3K79.","method":"In vitro methyltransferase assay with histone mutants; in vitro binding assay (H4 tail pulldown); in vivo mutagenesis of H4 basic patch and Dot1 acidic patch; telomere silencing assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay with mutagenesis plus in vivo validation; clearly mechanistic","pmids":["17675446"],"is_preprint":false},{"year":2008,"finding":"Dot1-dependent H3K79 methylation promotes Rad9 binding to chromatin at DSBs and uncapped telomeres, and Rad9/H3K79me together inhibit resection of DSBs by a Rad50-dependent nuclease, controlling ssDNA accumulation and thereby modulating Mec1 checkpoint kinase activation.","method":"Genetic deletion (dot1Δ, rad9Δ); ssDNA accumulation assays at DSBs and uncapped telomeres; Mec1 activation assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with specific molecular resection phenotype; corroborates prior mechanistic studies","pmids":["18418382"],"is_preprint":false},{"year":2008,"finding":"DOT1L is the sole H3K79 di- and trimethyltransferase in mammalian cells; Dot1l mutant fibroblasts lack H3K79 di- and trimethylation at all loci. DOT1L occupancy is ubiquitously coupled with active transcription, preferentially at the proximal transcribed region of active genes, and H3K79 methylation levels dynamically respond to changes in gene activity.","method":"ChIP-chip tiling arrays; ChIP in Dot1l mutant fibroblasts; western blot for H3K79 methylation states","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP combined with genetic null cells confirming sole enzyme status; two orthogonal approaches","pmids":["18285465"],"is_preprint":false},{"year":2009,"finding":"H2B monoubiquitination at K123 is required for both H3K4 trimethylation by COMPASS and H3K79 trimethylation by Dot1; this dependency is intrinsic to H2BK123 monoubiquitination regardless of additional H2B sequence alterations or epitope tags.","method":"Systematic alanine-scanning mutagenesis of histone H2A/H2B; in vivo methylation assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic mutagenesis in clean strain background, clarifying a previously contested mechanism","pmids":["19667127"],"is_preprint":false},{"year":2009,"finding":"Dot1 and its H3K79 methylation promote sister chromatid recombination (SCR) repair of replication-dependent DSBs in yeast; Dot1 and Rad9 promote DSB-induced loading of cohesin onto chromatin, suggesting that Rad9 recruitment via gammaH2A and H3K79me at DSBs contributes to SCR by regulating cohesin binding.","method":"Genetic epistasis; SCR assays; cohesin ChIP at DSBs","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cohesin ChIP combined with SCR assays in a single study; mechanism proposed but partial","pmids":["19332880"],"is_preprint":false},{"year":2010,"finding":"DOT1L forms a multisubunit complex (DotCom) with MLL fusion partners ENL, AF9/MLLT3, AF17/MLLT6, and AF10/MLLT10, as well as Wnt pathway components TRRAP, Skp1, and beta-catenin. DotCom trimethylates H3K79 and is required for Wnt/Wingless target gene expression in Drosophila; depletion of Bre1 (H2B ubiquitin E3 ligase) specifically reduces H3K79 trimethylation and Wingless target gene expression.","method":"Mass spectrometry of purified complex; H3K79 trimethylation in vitro assay; Drosophila RNAi knockdown; gene expression assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — complex purification with MS, in vitro enzymatic assay, and in vivo RNAi genetics; multiple orthogonal methods","pmids":["20203130"],"is_preprint":false},{"year":2011,"finding":"Cardiac-specific knockout of Dot1L in mice results in dilated cardiomyopathy. Mechanistically, DOT1L regulates transcription of the Dystrophin (Dmd) gene; loss of DOT1L reduces H3K79 methylation at the Dmd locus, decreasing Dystrophin expression and destabilizing the Dystrophin-glycoprotein complex. Re-expression of miniDmd rescues the DCM phenotype, establishing Dmd as a primary downstream target.","method":"Conditional cardiac-specific Dot1L knockout mice; ChIP for H3K79me at Dmd locus; mini-Dmd rescue experiment; protein complex analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with rescue experiment and ChIP; multiple orthogonal methods establishing specific target","pmids":["21289070"],"is_preprint":false},{"year":2011,"finding":"Conditional deletion of Dot1l in postnatal mouse hematopoiesis causes pancytopenia and failure of hematopoietic homeostasis; Dot1l-deficient cells fail to reconstitute recipient bone marrow. MLL-AF9 leukemic cells specifically require Dot1l for oncogenic transformation, whereas cells driven by Hoxa9/Meis1 or E2A-HLF do not.","method":"Conditional Dot1l knockout mouse model; competitive bone marrow transplantation; MLL-AF9, Hoxa9/Meis1, and E2A-HLF transformation assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with transplantation and multiple oncogene comparisons establishing specificity","pmids":["21398221"],"is_preprint":false},{"year":2011,"finding":"DOT1L deficiency in lung cancer cells causes multinucleated phenotype, abnormal mitotic spindle formation, and centrosome number abnormalities leading to chromosomal missegregation, G1 arrest, and senescence. Re-expression of catalytically active but not inactive DOT1L rescues these phenotypes, establishing the requirement for H3K79 methyltransferase activity.","method":"siRNA knockdown of DOT1L; catalytically active vs. inactive DOT1L re-expression; cell cycle analysis; mitotic spindle immunofluorescence; senescence-associated β-galactosidase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — catalytic mutant rescue experiment establishes enzymatic mechanism with specific cellular phenotype","pmids":["22190683"],"is_preprint":false},{"year":2011,"finding":"Dot1 displays histone chaperone activity independent of its methyltransferase activity: Dot1 can assemble core histones into nucleosomes and facilitate ATP-dependent chromatin-remodeling activity via its nucleosome-binding domain in vitro; this chaperone function regulates histone exchange and nucleosome dynamics at transcribed regions of long genes in vivo.","method":"In vitro nucleosome assembly assay; in vitro chromatin remodeling assay; global histone exchange analysis; genetic analysis of cryptic transcription","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution showing chaperone activity, single lab; replicated in global analysis but mechanism partially characterized","pmids":["29339748"],"is_preprint":false},{"year":2013,"finding":"DOT1L interacts with MLL fusion partners AF9 and ENL through a specific 10-amino acid region (DOT1L865-874) containing four conserved hydrophobic residues; the entire intact C-terminal domain of AF9/ENL is required for optimal interaction. This interaction is essential for immortalization by MLL-AF9, as alanine mutations at the binding site abrogate transformation.","method":"Alanine scanning mutagenesis; biochemical/biophysical binding studies; functional immortalization assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — mutagenesis mapping of binding site combined with functional transformation assay; multiple orthogonal methods","pmids":["23996074"],"is_preprint":false},{"year":2013,"finding":"Dot1-dependent H3K79 methylation is required for Mek1 meiotic checkpoint kinase autophosphorylation (but not Mec1/Tel1-dependent phosphorylation) during meiosis; H3K79me promotes Hop1 activation and proper distribution along meiotic chromosomes at least partly by regulating Pch2 localization. HOP1 overexpression bypasses the Dot1 requirement for checkpoint activation.","method":"Genetic manipulation of Dot1 catalytic activity; H3-K79 mutagenesis; Mek1 kinase activity assays; meiotic chromosome spreads; HOP1 overexpression epistasis","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic and biochemical dissection of checkpoint kinase cascade with epistasis experiments","pmids":["23382701"],"is_preprint":false},{"year":2018,"finding":"Structural analysis by cryo-EM of DOT1L bound to a nucleosome containing site-specifically ubiquitylated H2BK120 reveals that DOT1L engages the nucleosome acidic patch using a variant arginine anchor and adopts a conformation poised for methylation; DOT1L and ubiquitin interact directly through complementary hydrophobic surfaces, explaining how H2BK120ub stimulates DOT1L activity.","method":"Cryo-EM structure determination; site-specific ubiquitylation of H2BK120 in reconstituted nucleosomes","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with site-specifically modified substrate; provides atomic-level mechanism","pmids":["30759380"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of apo AF10OM-LZ and its complex with the coiled-coil domain of DOT1L reveals the molecular basis for DOT1L-AF10 interaction; zinc stabilizes the complex. Disruption of the DOT1L-AF10 interface abrogates MLL-AF10-associated leukemic transformation.","method":"X-ray crystallography; structure-guided mutagenesis; leukemic transformation assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with functional mutagenesis validating the interface in leukemic transformation","pmids":["29563185"],"is_preprint":false},{"year":2019,"finding":"DOT1L functions as a cofactor of ERα in breast cancer cell chromatin, where the two proteins co-localize to regulate estrogen target gene transcription. DOT1L blockade reduces H3K79 methylation and ERα/FOXA1 gene expression, blocking proliferation of hormone-responsive and antiestrogen-resistant breast cancer cells.","method":"ChIP-seq co-localization; siRNA knockdown and pharmacological inhibition; gene expression analysis; in vivo xenograft","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq co-localization plus functional assays, single lab","pmids":["30775443"],"is_preprint":false},{"year":2020,"finding":"DOT1L loss (KO), but not catalytic inactivation, causes defects in neural progenitor cell gene expression signature and glial cell specification in ESC differentiation, and exacerbates transcription elongation defects induced by a super elongation complex inhibitor; revealing a catalytic-independent role of DOT1L in transcription elongation and cell-fate determination.","method":"DOT1L knockout vs. catalytic-dead knock-in ESCs; neural differentiation assays; transcriptome analysis; super elongation complex inhibitor (KL-2) epistasis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic separation of catalytic vs. non-catalytic function using KO and catalytic dead knock-in; epistasis with SEC inhibitor","pmids":["33077595"],"is_preprint":false},{"year":2020,"finding":"DOT1L protein stability is regulated by O-GlcNAcylation at evolutionarily conserved S1511, mediated by OGT. O-GlcNAcylation at S1511 prevents binding of the E3 ubiquitin ligase UBE3C, which otherwise promotes DOT1L proteasomal degradation. HBP-enhanced O-GlcNAcylation increases H3K79 methylation and expression of HOXA9/MEIS1 target genes.","method":"Affinity purification-mass spectrometry; site-directed mutagenesis of S1511; co-immunoprecipitation of UBE3C-DOT1L; OGT inhibition/HBP pathway manipulation; ChIP for H3K79me","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS identification of modification site, mutagenesis, co-IP, and functional ChIP; multiple orthogonal methods in one study","pmids":["34551297"],"is_preprint":false},{"year":2020,"finding":"CBP mediates DOT1L acetylation at K358, stabilizing DOT1L by preventing RNF8 E3 ubiquitin ligase binding and subsequent proteasomal degradation without affecting enzymatic activity. Stabilized DOT1L then catalyzes H3K79 methylation at promoters of SNAIL and ZEB1, promoting EMT and cancer metastasis.","method":"Affinity purification-mass spectrometry; co-IP of RNF8-DOT1L; DOT1L K358 acetylation-mimic mutant; ChIP for H3K79me at EMT gene promoters; in vivo metastasis assay","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS identification of acetylation site, co-IP, acetylation-mimic mutagenesis, ChIP, and in vivo assay; multiple methods","pmids":["32042335"],"is_preprint":false},{"year":2020,"finding":"Dot1L interacts directly with the transcription factor Zc3h10 and is recruited to promoters of thermogenic genes including Ucp1 in brown adipose tissue; Dot1L methylates H3K79 at these promoters to coactivate gene expression. Dot1L ablation in brown adipocytes (Ucp1-Cre) prevents Ucp1 and other thermogenic gene activation, reduces thermogenic capacity, and promotes adiposity.","method":"Co-immunoprecipitation; ChIP; conditional Dot1L KO (Ucp1-Cre); thermogenic gene expression; metabolic phenotyping","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP establishing direct interaction, ChIP, and conditional KO with metabolic phenotype; multiple methods in one study","pmids":["33107819"],"is_preprint":false},{"year":2021,"finding":"DOT1L depletion in erythroleukemic cells reduces TBP occupancy on thousands of genes and reduces Pol II occupancy at a significant fraction of direct DOT1L-bound target genes, indicating a role in transcription initiation rather than elongation (no effect on Pol II traveling ratio or elongation rate). Mechanistically, the DOT1L complex may regulate initiation by facilitating TFIID recruitment/stabilization; DOT1L also limits SAGA deubiquitinase recruitment to maintain H2Bub1 levels.","method":"DOT1L depletion; 4sUDRB-seq (elongation rate); TBP/Pol II ChIP; proteomic and biochemical studies; SAGA complex recruitment assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — orthogonal transcription assays (elongation rate, TBP/Pol II ChIP) plus proteomics; mechanistically informative negative result on elongation","pmids":["34187895"],"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 and H2BUb play crucial roles specifically in H3K79 di- and trimethylation in vitro and in vivo.","method":"In vitro methyltransferase assay with H4K16ac-modified nucleosomes; in vivo methylation state analysis; mechanistic structural/biochemical analysis","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with site-specifically modified histones; mechanistic analysis of allostery with in vivo validation","pmids":["33479126"],"is_preprint":false},{"year":2021,"finding":"AF10 (MLLT10) interacts with DOT1L and is required for higher-order H3K79 methylation in somatic cells; AF10-DOT1L interaction (but not a DOT1L-binding-impaired AF10 mutant) maintains H3K79 methylation and acts as a barrier to somatic cell reprogramming by sustaining fibroblast-specific gene programs.","method":"Proximity-based labeling proteomics; AF10 KO and re-expression; DOT1L-binding-impaired AF10 mutant rescue; H3K79 methylation western blot; transcriptomic analysis during reprogramming","journal":"Epigenetics & chromatin","confidence":"High","confidence_rationale":"Tier 2 / Strong — proximity proteomics plus structure-function mutagenesis of interaction domain and transcriptomic analysis; multiple methods","pmids":["34215314"],"is_preprint":false},{"year":2021,"finding":"Dot1 promotes H2B monoubiquitination through its N-terminus in a methyltransferase-independent manner; increased Dot1 dosage elevates H2Bub1 levels and this is exacerbated by loss of SAGA-DUB deubiquitinase activity, establishing bidirectional crosstalk between Dot1 and H2Bub1.","method":"Genetic interaction mapping with increased-dosage DOT1 alleles; H2Bub1 western blot; N-terminal deletion mutants of Dot1","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic interaction plus domain deletion analysis, single lab, two approaches","pmids":["30203048"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of Dot1L bound to H2BK34ub nucleosomes reveal that H2BK34-anchored ubiquitin does not directly contact Dot1L (unlike H2BK120ub), but instead induces DNA and histone distortion around the modified site to position Dot1L in a productive conformation, establishing nucleosome distortion as a distinct mechanism by which ubiquitination stimulates Dot1L.","method":"Cryo-EM structure determination of Dot1L-H2BK34ub nucleosome complex and H2BK34ub nucleosome alone; site-specific ubiquitylation","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — dual cryo-EM structures providing atomic mechanism; site-specifically modified substrates","pmids":["35739357"],"is_preprint":false},{"year":2022,"finding":"DOT1L activity requires ubiquitin and nucleosome acidic patch binding for productive nucleosome engagement; these interactions drive conformational changes that stimulate DOT1L activity. Structure-guided mutations abolishing either ubiquitin or acidic patch binding impair cell proliferation in MV4;11 MLL-rearranged leukemia cells.","method":"Bulk and single-molecule biophysical measurements; structure-guided mutagenesis; cancer cell proliferation assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — single-molecule biophysics combined with mutagenesis and functional cancer cell assay; multiple orthogonal methods","pmids":["35172132"],"is_preprint":false},{"year":2022,"finding":"H3K79me2 in DOT1L-regulated gene bodies and regulatory elements synergizes to promote expression of chamber-specific genes during cardiogenesis (particularly left ventricle-specific genes); H3K79me2 at specific regulatory elements also contributes to silencing of genes normally not expressed in cardiomyocytes. Embryonic cardiomyocyte-specific Dot1l ablation impairs postnatal cardiomyocyte cell cycle withdrawal.","method":"Embryonic cardiomyocyte-specific Dot1l conditional KO; H3K79me2 ChIP-seq; transcriptome analysis; cardiomyocyte cell cycle analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with ChIP-seq and transcriptomics revealing both activating and silencing functions at specific loci","pmids":["36460641"],"is_preprint":false},{"year":2022,"finding":"DOT1L directly regulates the transcription of NF-κB1 and NF-κB2 in vascular smooth muscle cells via H3K79me2 enrichment at their loci, which in turn induces expression of CCL5 and CXCL10, promoting atherosclerosis. VSMC-specific Dot1l KO in ApoE-/- mice significantly reduces atherosclerosis progression.","method":"VSMC-specific inducible KO mouse crossed with ApoE-/- model; RNA-seq; H3K79me2 ChIP-seq; VSMC phenotyping","journal":"European heart journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific conditional KO with H3K79me2 ChIP-seq identifying direct target genes; in vivo disease model","pmids":["35292818"],"is_preprint":false},{"year":2018,"finding":"Dot1 binding to chromatin can deregulate heterochromatin-mediated silencing by both H3K79 methylation-dependent and methylation-independent mechanisms; the methylation-independent mechanism requires histone acetyltransferase Gcn5 and can relocalize telomeres away from the nuclear periphery.","method":"Targeted Dot1 tethering; H3K79 methylation-dead Dot1 mutant; live-cell telomere imaging; genetic epistasis with Gcn5","journal":"Epigenetics & chromatin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — targeted tethering with catalytic mutant and live imaging; single lab, but two orthogonal approaches","pmids":["21291527"],"is_preprint":false},{"year":2011,"finding":"H3K79 methylation by Dot1 is required for global genomic repair (GGR) but not transcription-coupled repair (TCR) of UV damage in yeast; both mono/di/trimethylation states contribute to GGR, and the mechanism is independent of checkpoint activation or Rad16 expression regulation, suggesting methylated H3K79 serves as a docking site for GGR machinery.","method":"Dot1 deletion and H3K79 mutation; GGR vs. TCR assays; checkpoint activation analysis; Rad16 expression analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific repair pathway dissection with genetic controls; single lab, multiple genetic approaches","pmids":["21460225"],"is_preprint":false},{"year":2018,"finding":"DOT1L-methylated H3K79 is involved in binding and recruiting XPC to UV-damage sites for nucleotide excision repair (NER); DOT1L loss impairs NER, leading to accumulation of UV-induced DNA damage and promotion of melanoma development in mice exposed to UV radiation.","method":"DOT1L KO mice + UVR; ChIP showing H3K79me at damage sites; XPC recruitment assay; NER efficiency measurement","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse model plus ChIP-based recruitment assay; single lab","pmids":["29343685"],"is_preprint":false},{"year":2017,"finding":"DOT1L is recruited by the ENL-containing DOT1L complex to maintain transcription of MLL fusion target genes; MLL-ENL and MLL-AF10 constitutively activate transcription by inducing both AEP (AF4-ENL-P-TEFb)-dependent transcriptional activation and DOT1L-dependent transcriptional maintenance, mostly in the absence of PRC1.","method":"Genetic and biochemical analysis of complex membership; gene expression analysis; transformation assays with MLL-ENL and MLL-AF10","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — complex characterization with functional transformation assays, single lab","pmids":["28394257"],"is_preprint":false},{"year":2016,"finding":"DOT1L, via H3K79 dimethylation, facilitates histone H4 acetylation, which in turn regulates BRD4 binding to chromatin; BRD4 and DOT1L exist in separate protein complexes but functionally collaborate, especially at highly transcribed genes near superenhancers in MLL leukemia.","method":"Quantitative proteomics; chemoproteomics; biochemical fractionation; genetic disruption and small-molecule inhibition of BRD4 and DOT1L; H4 acetylation ChIP","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — quantitative proteomics establishing separate complexes; ChIP establishing H3K79me2-H4ac crosstalk; multiple orthogonal methods","pmids":["27294782"],"is_preprint":false},{"year":2020,"finding":"DOT1L inhibition in AR-positive prostate cancer cells reduces MYC expression by loss of H3K79 methylation at a distal MYC enhancer bound by AR and DOT1L; reduced MYC upregulates E3 ubiquitin ligases HECTD4 and MYCBP2, which promote AR and MYC proteasomal degradation in a negative feedforward loop.","method":"DOT1L knockdown/inhibition in AR+ vs AR- cells; ChIP for H3K79me at MYC enhancer; MYC expression; E3 ligase identification; AR/MYC protein stability assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP establishing enhancer mechanism; E3 ligase identification; feedforward loop validated; multiple methods","pmids":["32814769"],"is_preprint":false},{"year":2022,"finding":"SESAME complex-catalyzed H3T11 phosphorylation directly reduces Dot1 binding to chromatin and inhibits Dot1-catalyzed H3K79 trimethylation, thereby repressing autophagy gene transcription; the Reb1 telomere-associated factor recruits SESAME to telomeres to phosphorylate H3T11, preventing invasion of H3K79me3 into heterochromatin to maintain telomere silencing.","method":"Chromatin binding assays; H3K79me3 in vitro/in vivo methylation assays; autophagy gene expression assays; ChIP; Reb1 tethering at telomeres","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic chromatin binding and methylation assays with in vivo genetic validation; single lab","pmids":["36473858"],"is_preprint":false},{"year":2022,"finding":"H3K79me3 is selectively enriched at pericentromeric repetitive elements relative to H3K79me2 in mouse ESCs; DOT1L loss compromises pericentromeric satellite repeat transcription, destabilizes pericentromeric heterochromatin, and impairs preimplantation viability. This involves possible coordination between DOT1L and the chromatin remodeler SMARCA5.","method":"H3K79me2/me3 ChIP-seq; DOT1L KO ESCs and cleavage-stage embryos; satellite repeat transcription assays; heterochromatin marker analysis","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq with KO ESCs and embryos; coordination with SMARCA5 is proposed but not fully mechanistically established","pmids":["37317657"],"is_preprint":false},{"year":2022,"finding":"DOT1L directly regulates macrophage lipid biosynthesis gene programs including central regulators SREBP1 and SREBP2; DOT1L inhibition leads to macrophage hyperactivation, and myeloid-specific Dot1l deficiency reduces atherosclerotic plaque stability in vivo.","method":"Selective DOT1L inhibitor in mouse and human macrophages; myeloid-specific Dot1l KO mice; RNA-seq; SREBP pathway analysis; atherosclerosis plaque analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO combined with transcriptomics; SREBP regulation established genetically; single lab","pmids":["36417856"],"is_preprint":false},{"year":2021,"finding":"DOT1L promotes expression of HoxC transcription factors (HoxC9, HoxC10) in spermatogonial stem cells; H3K79me2 accumulates at HoxC9 and HoxC10 loci, and DOT1L is required for spermatogonial stem cell self-renewal and lifelong spermatogenesis.","method":"Conditional DOT1L KO in male germline; H3K79me2 ChIP at HoxC9/HoxC10; spermatogonial stem cell transplantation assay; gene expression analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with transplantation assay establishing stem cell activity, plus ChIP for target loci; multiple methods","pmids":["35738678"],"is_preprint":false},{"year":2023,"finding":"DOT1L inhibition in apical progenitors (neural stem cells) increases neurogenic symmetric consumptive divisions over self-renewing asymmetric divisions, reduces activity of EZH2/PRC2 pathway, and converges on increased expression of asparagine synthetase (ASNS); ASNS overexpression phenocopies DOT1L inhibition, linking DOT1L activity to asparagine metabolism and neural stem cell lineage progression.","method":"Lineage tracing combined with single-cell RNA-seq of clonally related cells; DOT1L inhibition; ASNS overexpression; PRC2 pathway analysis","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clonal lineage tracing with scRNA-seq; phenocopy experiment with ASNS; single lab","pmids":["37382163"],"is_preprint":false},{"year":2021,"finding":"DOT1L epigenetically promotes c-Myc transcription via H3K79me2 enrichment at the c-Myc promoter region (-682 to +284); H3K79me2 enrichment at this region is reduced after DOT1L knockdown, and c-Myc restoration rescues cell cycle arrest caused by DOT1L silencing in colorectal cancer cells.","method":"ChIP for H3K79me2 at c-Myc promoter; DOT1L siRNA knockdown; c-Myc rescue experiments; cell cycle analysis","journal":"Clinical epigenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP at specific promoter plus rescue experiment; single lab","pmids":["31888761"],"is_preprint":false},{"year":2010,"finding":"Tandem affinity purification of DOT1L-containing complexes revealed that AF9, ENL, and NPM1 are major DOT1L-interacting proteins in mammalian cells; separate purification of AF9-, ENL-, and NPM1-containing complexes by mass spectrometry further defined a DOT1L interaction network suggesting roles in AF9/ENL-mediated transcription, RNA processing, and histone chaperoning via NPM1.","method":"Tandem affinity purification; mass spectrometry","journal":"The protein journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic complex purification with MS; interactors identified but functional follow-up is limited in this paper","pmids":["20431927"],"is_preprint":false},{"year":2019,"finding":"DOT1L is required for proper DNA double-strand break response and repair via homologous recombination (HR) in colorectal cancer cells; DOT1L depletion or inhibition impairs γH2AX phosphorylation and HR repair efficiency, and DOT1L inhibition combined with chemotherapy shows additive effects on cell killing.","method":"siRNA knockdown and small-molecule inhibitors; γH2AX assay; HR repair assay; drug combination assays","journal":"Clinical epigenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple assays for HR repair with KD and inhibitor; single lab","pmids":["30616689"],"is_preprint":false},{"year":2024,"finding":"PARP1 directly binds to the DOT1L gene promoter and promotes DOT1L transcription independently of its enzymatic activity; PARPi-induced PARP1 trapping amplifies this binding, enhancing DOT1L transcription. DOT1L in turn regulates PLCG2 and ABCB1 via H3K79me2, establishing a PARP1-DOT1L-PLCG2/ABCB1 resistance axis.","method":"ChIP for PARP1 at DOT1L promoter; RNA sequencing; CUT&Tag for H3K79me2 at PLCG2/ABCB1 loci; PARPi treatment; CDX and PDO models","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and CUT&Tag establishing direct transcriptional regulation; single lab with multiple methods","pmids":["38778348"],"is_preprint":false}],"current_model":"DOT1L (KMT4) is the sole histone H3 lysine 79 (H3K79) methyltransferase in eukaryotes, lacking a SET domain and instead methylating H3K79 within the nucleosome core; its activity requires direct engagement of the nucleosome acidic patch (via a variant arginine anchor), is allosterically stimulated by H2BK120 ubiquitination through direct ubiquitin–DOT1L hydrophobic contacts and by H4K16 acetylation through a distinct allosteric mechanism, requires the H4 tail basic patch in trans, and is regulated post-translationally by O-GlcNAcylation (at S1511, opposing UBE3C-mediated degradation) and CBP-mediated K358 acetylation (opposing RNF8-mediated degradation); H3K79me marks active chromatin and mediates diverse processes including DNA damage checkpoint activation (by recruiting 53BP1/Rad9 to breaks via Tudor domain recognition), global genomic nucleotide excision repair, telomeric silencing (by excluding Sir proteins from methylated chromatin), transcription initiation (by stabilizing TFIID/TBP), transcription elongation (via a catalytic-independent scaffolding function), and cell cycle progression, while in leukemia DOT1L is aberrantly recruited to HOX gene loci by MLL fusion proteins (via direct binding to AF9/ENL through DOT1L residues 865–874 and to AF10 via a coiled-coil interaction stabilized by zinc), driving oncogenic H3K79 hypermethylation and leukemic transformation."},"narrative":{"mechanistic_narrative":"DOT1L (KMT4) is the sole histone H3 lysine 79 (H3K79) methyltransferase in eukaryotes, acting within the nucleosome core rather than on a histone tail and depositing the H3K79 methylation mark that broadly tracks with transcriptionally active chromatin [PMID:12080090, PMID:18285465]. Catalysis requires productive engagement of the nucleosome acidic patch and is regulated by combinatorial cross-talk: H2B monoubiquitination (at K123/K120) is required for H3K79 trimethylation [PMID:19667127], cryo-EM showing this proceeds through direct ubiquitin–DOT1L hydrophobic contacts for H2BK120ub but through nucleosome distortion for H2BK34ub [PMID:30759380, PMID:35739357], while H4K16 acetylation allosterically stimulates the enzyme and the H4 tail basic patch is needed in trans [PMID:17675446, PMID:33479126]; abolishing ubiquitin or acidic-patch binding impairs leukemic cell proliferation [PMID:35172132]. Through H3K79 methylation DOT1L mediates DNA damage checkpoint signaling by recruiting the Rad9/53BP1 Tudor-domain readers to breaks [PMID:16166626, PMID:18418382], global genomic nucleotide excision repair via XPC recruitment [PMID:29343685], telomeric silencing through exclusion of Sir proteins [PMID:12080090], and transcription initiation by stabilizing TBP/TFIID occupancy [PMID:34187895]. DOT1L also possesses catalytic-independent functions in transcription elongation, cell-fate determination, and histone chaperoning/nucleosome dynamics [PMID:29339748, PMID:33077595]. As a transcriptional coactivator it is recruited by sequence-specific and signaling factors—ERα, Zc3h10, AR, and Wnt/β-catenin components—to methylate H3K79 at target loci controlling estrogen response, thermogenesis, MYC expression, and developmental programs [PMID:20203130, PMID:30775443, PMID:33107819, PMID:32814769]. In MLL-rearranged leukemia, DOT1L is aberrantly recruited to HOX loci by MLL fusion partners through a defined 10-residue surface binding AF9/ENL [PMID:23996074] and through a zinc-stabilized coiled-coil interface with AF10, both interactions being required for transformation [PMID:29563185, PMID:21398221]. DOT1L abundance is further controlled post-translationally by OGT-mediated O-GlcNAcylation at S1511 opposing UBE3C-driven degradation [PMID:34551297] and by CBP-mediated K358 acetylation opposing RNF8-driven degradation [PMID:32042335]. Tissue-specific loss reveals essential physiological roles, including a requirement in cardiomyocytes where DOT1L sustains Dystrophin expression and its loss causes dilated cardiomyopathy [PMID:21289070].","teleology":[{"year":2000,"claim":"Established the first phenotypic role of Dot1, showing it is required for meiotic pachytene checkpoint integrity before its biochemical activity was known.","evidence":"Genetic deletion of DOT1 with meiotic progression assays and Pch2/Sir2 localization microscopy in yeast","pmids":["11029058"],"confidence":"High","gaps":["Did not identify the molecular activity underlying the phenotype","Connection to histone methylation not yet known"]},{"year":2002,"claim":"Defined the enzyme's substrate—answering what Dot1 does biochemically—by showing it methylates H3K79 in the nucleosome core and that this mark mediates telomeric silencing by controlling Sir protein binding.","evidence":"Active-site and H3-K79 mutagenesis with Sir protein ChIP and silencing reporters in yeast","pmids":["12080090"],"confidence":"High","gaps":["Mechanism of Sir exclusion by methylation not structurally defined","Mammalian enzyme not yet characterized"]},{"year":2005,"claim":"Linked H3K79 methylation to the DNA damage response, showing it is required for checkpoint adaptor Rad9 phosphorylation and downstream Rad53 activation, and that Rad9/53BP1 reads the mark via its Tudor domain.","evidence":"Genetic deletion/mutation of DOT1, H3-K79, H2B-K123 with Rad53 kinase assays and Rad9 Tudor-domain mutagenesis/ChIP in yeast and human cells","pmids":["15632126","16166626"],"confidence":"High","gaps":["Did not resolve how methylated K79 is exposed at breaks","Structural basis of Tudor–H3K79me recognition not defined here"]},{"year":2007,"claim":"Uncovered trans-histone regulation, showing the H4 basic patch and Dot1's own acidic patch are required for H3K79 methylation, defining cross-tail communication in the nucleosome.","evidence":"In vitro methyltransferase and binding assays with histone mutants plus in vivo H4 basic-patch mutagenesis in yeast","pmids":["17675446"],"confidence":"High","gaps":["Atomic basis of the H4-tail requirement awaited later structures","Did not address ubiquitin dependence"]},{"year":2008,"claim":"Confirmed DOT1L as the sole mammalian H3K79 di/trimethyltransferase and connected its occupancy genome-wide to active transcription.","evidence":"ChIP-chip and ChIP in Dot1l-null fibroblasts with western blots for methylation states","pmids":["18285465"],"confidence":"High","gaps":["Causal direction between methylation and transcription not resolved","No mechanism for transcription coupling provided"]},{"year":2009,"claim":"Resolved the H2B ubiquitination requirement, showing H2BK123ub is intrinsically required for H3K79 trimethylation independent of confounding histone alterations.","evidence":"Systematic alanine-scanning mutagenesis of H2A/H2B with in vivo methylation assays in yeast","pmids":["19667127"],"confidence":"High","gaps":["Did not define the physical ubiquitin–enzyme contact","Did not explain mono- vs trimethylation control"]},{"year":2010,"claim":"Defined DOT1L's complex membership (DotCom) including MLL fusion partners and Wnt components, framing both its leukemia relevance and a developmental coactivator role.","evidence":"Mass spectrometry of purified complex with in vitro methylation and Drosophila RNAi gene-expression assays; complementary TAP-MS in mammalian cells identifying AF9/ENL/NPM1","pmids":["20203130","20431927"],"confidence":"High","gaps":["Functional contribution of individual subunits not dissected","NPM1 chaperoning role inferred but not tested"]},{"year":2011,"claim":"Demonstrated tissue-specific physiological requirements—hematopoietic homeostasis, MLL-AF9 leukemia dependence, and cardiac function via Dmd—establishing DOT1L as a context-dependent essential regulator.","evidence":"Conditional Dot1l knockout mice, bone-marrow transplantation, oncogene transformation comparisons, and mini-Dmd rescue with locus ChIP","pmids":["21398221","21289070"],"confidence":"High","gaps":["Did not separate catalytic from scaffolding contributions in each tissue","Target gene selectivity mechanism unresolved"]},{"year":2011,"claim":"Revealed catalytic-dependent mitotic and genome-stability functions, with catalytic-mutant rescue showing H3K79 methyltransferase activity is required for proper spindle/centrosome function, and a separate methylation-independent histone chaperone activity.","evidence":"siRNA with catalytic active/inactive re-expression and mitotic phenotyping in lung cancer cells; in vitro nucleosome assembly/remodeling and histone exchange analysis","pmids":["22190683","29339748"],"confidence":"Medium","gaps":["Chaperone mechanism only partially characterized in vitro","Link between mitotic defects and specific target genes unclear"]},{"year":2013,"claim":"Mapped the AF9/ENL binding determinant to DOT1L residues 865–874, showing this interaction is required for MLL-AF9 immortalization—defining a druggable protein–protein interface in leukemia.","evidence":"Alanine-scanning mutagenesis, biophysical binding studies, and immortalization assays","pmids":["23996074"],"confidence":"High","gaps":["Did not define the AF10 interface","Structure of the bound complex not resolved here"]},{"year":2018,"claim":"Provided atomic mechanism, showing DOT1L engages the nucleosome acidic patch via a variant arginine anchor and contacts H2BK120-ubiquitin directly through complementary hydrophobic surfaces.","evidence":"Cryo-EM of DOT1L bound to site-specifically ubiquitylated H2BK120 nucleosomes","pmids":["30759380"],"confidence":"High","gaps":["Did not address other ubiquitin sites","Allosteric coupling to catalysis only partially visualized"]},{"year":2018,"claim":"Crystallized the DOT1L–AF10 coiled-coil interface, showing zinc stabilizes it and its disruption blocks MLL-AF10 transformation, completing the structural picture of leukemic recruitment.","evidence":"X-ray crystallography with structure-guided mutagenesis and transformation assays","pmids":["29563185"],"confidence":"High","gaps":["Did not address how recruitment alters H3K79me genome-wide","AF10's higher-order methylation role addressed separately"]},{"year":2020,"claim":"Separated catalytic from non-catalytic roles in development, showing DOT1L loss but not catalytic inactivation disrupts neural/glial differentiation and exacerbates elongation defects—revealing a scaffolding function in elongation and cell fate.","evidence":"DOT1L knockout vs catalytic-dead knock-in ESCs with neural differentiation, transcriptomics, and SEC inhibitor epistasis","pmids":["33077595"],"confidence":"High","gaps":["Molecular partners of the scaffolding function not fully defined","How the non-catalytic role intersects elongation machinery unresolved"]},{"year":2020,"claim":"Defined post-translational control of DOT1L abundance through two opposing modification–degradation axes—O-GlcNAcylation at S1511 blocking UBE3C and CBP acetylation at K358 blocking RNF8—linking metabolic and signaling state to H3K79 methylation output.","evidence":"AP-MS site mapping, mutagenesis, UBE3C/RNF8 co-IP, and functional ChIP at target loci","pmids":["34551297","32042335"],"confidence":"High","gaps":["Crosstalk between the two modification axes untested","Upstream signals regulating these modifications in vivo unclear"]},{"year":2021,"claim":"Reframed DOT1L's transcriptional role toward initiation, showing depletion reduces TBP and Pol II occupancy without affecting elongation rate, and that H4K16ac allosterically stimulates the enzyme distinctly from ubiquitin.","evidence":"4sUDRB-seq, TBP/Pol II ChIP, and proteomics in erythroleukemic cells; in vitro methyltransferase assays with H4K16ac nucleosomes","pmids":["34187895","33479126"],"confidence":"High","gaps":["How DOT1L stabilizes TFIID mechanistically not resolved","Coordination of H4K16ac and ubiquitin allostery only partially defined"]},{"year":2022,"claim":"Established a second mode of ubiquitin stimulation, showing H2BK34ub acts through DNA/histone distortion rather than direct contact, and confirmed acidic-patch and ubiquitin binding are required for leukemic proliferation.","evidence":"Cryo-EM of Dot1L-H2BK34ub nucleosomes and single-molecule biophysics with structure-guided mutagenesis in MLL-rearranged cells","pmids":["35739357","35172132"],"confidence":"High","gaps":["Relative contribution of each ubiquitin mode in vivo unclear","Distortion mechanism for other modifications untested"]},{"year":2022,"claim":"Expanded DOT1L's physiological reach as a factor-recruited coactivator across cardiogenesis, brown-fat thermogenesis, atherosclerosis, and germline/stem-cell programs, in some cases also silencing genes.","evidence":"Tissue-specific conditional Dot1l knockouts with H3K79me2 ChIP-seq and transcriptomics across heart, brown adipose (Zc3h10), VSMC/macrophage, and spermatogonial models","pmids":["36460641","33107819","35292818","36417856","35738678"],"confidence":"High","gaps":["Mechanism of locus-specific silencing by an activating mark unresolved","Determinants of tissue-specific target selection unclear"]},{"year":2024,"claim":"Positioned DOT1L within transcriptional regulatory loops with c-Myc/MYC and a PARP1-driven resistance axis, showing it both activates oncogenic targets and is itself transcriptionally controlled.","evidence":"ChIP/CUT&Tag for H3K79me2 at MYC and PLCG2/ABCB1 loci, PARP1 promoter ChIP, and rescue experiments in colorectal, prostate, and PARPi-resistance models","pmids":["31888761","32814769","38778348"],"confidence":"Medium","gaps":["Single-lab findings without reciprocal validation across models","Generality of the PARP1-DOT1L axis across tumor types untested"]},{"year":null,"claim":"How DOT1L achieves locus-specific target selection—and how its single H3K79 mark can both activate and silence distinct genes within the same cell—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking recruitment factors to context-dependent activation vs silencing","Mechanistic basis of the catalytic-independent scaffolding function incompletely defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,6,16,24]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[9,18,22,23]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[4,16]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[13]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,0]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[6,16,38]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,23,9]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,4,24]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[3,5,33,44]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[11,14,17,36]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[10,29,40]}],"complexes":["DotCom"],"partners":["AF9","ENL","AF10","NPM1","UBE3C","RNF8","OGT","ZC3H10"],"other_free_text":[]}},"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 all","driving_tissues":[{"tissue":"testis","ntpm":49.2}],"url":"https://www.proteinatlas.org/search/DOT1L"},"hgnc":{"alias_symbol":["KIAA1814","DOT1","KMT4"],"prev_symbol":[]},"alphafold":{"accession":"Q8TEK3","domains":[{"cath_id":"1.10.260.60","chopping":"2-99","consensus_level":"medium","plddt":88.4801,"start":2,"end":99},{"cath_id":"3.40.50.150","chopping":"123-331","consensus_level":"medium","plddt":90.0628,"start":123,"end":331},{"cath_id":"1.20.5","chopping":"562-615","consensus_level":"medium","plddt":82.0698,"start":562,"end":615},{"cath_id":"1.20.5","chopping":"618-652","consensus_level":"medium","plddt":85.8869,"start":618,"end":652}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TEK3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TEK3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TEK3-F1-predicted_aligned_error_v6.png","plddt_mean":52.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DOT1L","jax_strain_url":"https://www.jax.org/strain/search?query=DOT1L"},"sequence":{"accession":"Q8TEK3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TEK3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TEK3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TEK3"}},"corpus_meta":[{"pmid":"21724828","id":"PMC_21724828","title":"The 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Mutations abolishing Dot1 catalytic activity impair telomeric silencing, and this correlates with weakened interaction of Sir2 and Sir3 with telomeric regions in vivo, establishing H3K79 methylation as the mechanism by which Dot1 mediates telomeric silencing.\",\n      \"method\": \"In vivo mutagenesis of H3-K79 and Dot1 catalytic residues; Sir protein ChIP; telomeric silencing reporter assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — active-site mutagenesis combined with in vivo ChIP and functional silencing assays; foundational study replicated widely\",\n      \"pmids\": [\"12080090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Yeast Dot1 is required for meiotic pachytene checkpoint function: in dot1 mutants, synapsis-defective (zip1, dmc1) cells bypass the checkpoint and produce inviable meiotic products. Dot1 is also required for proper nucleolar concentration of checkpoint proteins Pch2 and Sir2, and for preventing sister-chromatid repair by the Rad54 pathway during meiosis.\",\n      \"method\": \"Genetic deletion of DOT1; meiotic progression assays; fluorescence microscopy of Pch2/Sir2 localization\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic deletion with specific meiotic checkpoint and localization phenotypes; replicated in subsequent studies\",\n      \"pmids\": [\"11029058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Dot1-dependent H3K79 methylation is required for DNA damage checkpoint activation in S. cerevisiae: loss of H3K79 methylation does not affect Mec1 activation but prevents phosphorylation of the checkpoint adaptor Rad9, thereby blocking Rad53 kinase activation and causing checkpoint deficiency.\",\n      \"method\": \"Genetic deletion/mutation of DOT1, H3-K79, H2B-K123; Rad53 kinase phosphorylation assays; cell cycle arrest assays after genotoxic stress\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis with specific checkpoint kinase readout, corroborated by parallel study (PMID:16166626)\",\n      \"pmids\": [\"15632126\", \"16166626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Dot1/H3K79 methylation mediates G1 and intra-S phase checkpoint activation after ionizing radiation by enabling Rad9 (yeast 53BP1 ortholog) binding to double-strand break sites via its Tudor domain; Tudor domain mutations in Rad9 that abrogate methylated K79 binding phenocopy dot1 deletion and block Rad53 phosphorylation. In human cells, DOT1L-mediated H3K79 methylation similarly mediates 53BP1 recruitment to DSBs via its paired Tudor domains.\",\n      \"method\": \"Genetic screen; Rad9 Tudor domain mutagenesis; Rad53 phosphorylation assays; ChIP for Rad9 at DSBs\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Tudor domain mutagenesis with specific checkpoint kinase phenotypes; validated in both yeast and human cell contexts\",\n      \"pmids\": [\"16166626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Dot1 requires the basic patch residues R17-H18-R19 of the histone H4 N-terminal tail for H3K79 methyltransferase activity in vitro and in vivo. Dot1 physically interacts with the H4 tail via its own C-terminal acidic patch. This defines a novel trans-histone pathway whereby H4 tail charge is required for modification of H3K79.\",\n      \"method\": \"In vitro methyltransferase assay with histone mutants; in vitro binding assay (H4 tail pulldown); in vivo mutagenesis of H4 basic patch and Dot1 acidic patch; telomere silencing assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay with mutagenesis plus in vivo validation; clearly mechanistic\",\n      \"pmids\": [\"17675446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Dot1-dependent H3K79 methylation promotes Rad9 binding to chromatin at DSBs and uncapped telomeres, and Rad9/H3K79me together inhibit resection of DSBs by a Rad50-dependent nuclease, controlling ssDNA accumulation and thereby modulating Mec1 checkpoint kinase activation.\",\n      \"method\": \"Genetic deletion (dot1Δ, rad9Δ); ssDNA accumulation assays at DSBs and uncapped telomeres; Mec1 activation assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with specific molecular resection phenotype; corroborates prior mechanistic studies\",\n      \"pmids\": [\"18418382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DOT1L is the sole H3K79 di- and trimethyltransferase in mammalian cells; Dot1l mutant fibroblasts lack H3K79 di- and trimethylation at all loci. DOT1L occupancy is ubiquitously coupled with active transcription, preferentially at the proximal transcribed region of active genes, and H3K79 methylation levels dynamically respond to changes in gene activity.\",\n      \"method\": \"ChIP-chip tiling arrays; ChIP in Dot1l mutant fibroblasts; western blot for H3K79 methylation states\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP combined with genetic null cells confirming sole enzyme status; two orthogonal approaches\",\n      \"pmids\": [\"18285465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"H2B monoubiquitination at K123 is required for both H3K4 trimethylation by COMPASS and H3K79 trimethylation by Dot1; this dependency is intrinsic to H2BK123 monoubiquitination regardless of additional H2B sequence alterations or epitope tags.\",\n      \"method\": \"Systematic alanine-scanning mutagenesis of histone H2A/H2B; in vivo methylation assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic mutagenesis in clean strain background, clarifying a previously contested mechanism\",\n      \"pmids\": [\"19667127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Dot1 and its H3K79 methylation promote sister chromatid recombination (SCR) repair of replication-dependent DSBs in yeast; Dot1 and Rad9 promote DSB-induced loading of cohesin onto chromatin, suggesting that Rad9 recruitment via gammaH2A and H3K79me at DSBs contributes to SCR by regulating cohesin binding.\",\n      \"method\": \"Genetic epistasis; SCR assays; cohesin ChIP at DSBs\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cohesin ChIP combined with SCR assays in a single study; mechanism proposed but partial\",\n      \"pmids\": [\"19332880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DOT1L forms a multisubunit complex (DotCom) with MLL fusion partners ENL, AF9/MLLT3, AF17/MLLT6, and AF10/MLLT10, as well as Wnt pathway components TRRAP, Skp1, and beta-catenin. DotCom trimethylates H3K79 and is required for Wnt/Wingless target gene expression in Drosophila; depletion of Bre1 (H2B ubiquitin E3 ligase) specifically reduces H3K79 trimethylation and Wingless target gene expression.\",\n      \"method\": \"Mass spectrometry of purified complex; H3K79 trimethylation in vitro assay; Drosophila RNAi knockdown; gene expression assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — complex purification with MS, in vitro enzymatic assay, and in vivo RNAi genetics; multiple orthogonal methods\",\n      \"pmids\": [\"20203130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cardiac-specific knockout of Dot1L in mice results in dilated cardiomyopathy. Mechanistically, DOT1L regulates transcription of the Dystrophin (Dmd) gene; loss of DOT1L reduces H3K79 methylation at the Dmd locus, decreasing Dystrophin expression and destabilizing the Dystrophin-glycoprotein complex. Re-expression of miniDmd rescues the DCM phenotype, establishing Dmd as a primary downstream target.\",\n      \"method\": \"Conditional cardiac-specific Dot1L knockout mice; ChIP for H3K79me at Dmd locus; mini-Dmd rescue experiment; protein complex analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with rescue experiment and ChIP; multiple orthogonal methods establishing specific target\",\n      \"pmids\": [\"21289070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Conditional deletion of Dot1l in postnatal mouse hematopoiesis causes pancytopenia and failure of hematopoietic homeostasis; Dot1l-deficient cells fail to reconstitute recipient bone marrow. MLL-AF9 leukemic cells specifically require Dot1l for oncogenic transformation, whereas cells driven by Hoxa9/Meis1 or E2A-HLF do not.\",\n      \"method\": \"Conditional Dot1l knockout mouse model; competitive bone marrow transplantation; MLL-AF9, Hoxa9/Meis1, and E2A-HLF transformation assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with transplantation and multiple oncogene comparisons establishing specificity\",\n      \"pmids\": [\"21398221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DOT1L deficiency in lung cancer cells causes multinucleated phenotype, abnormal mitotic spindle formation, and centrosome number abnormalities leading to chromosomal missegregation, G1 arrest, and senescence. Re-expression of catalytically active but not inactive DOT1L rescues these phenotypes, establishing the requirement for H3K79 methyltransferase activity.\",\n      \"method\": \"siRNA knockdown of DOT1L; catalytically active vs. inactive DOT1L re-expression; cell cycle analysis; mitotic spindle immunofluorescence; senescence-associated β-galactosidase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — catalytic mutant rescue experiment establishes enzymatic mechanism with specific cellular phenotype\",\n      \"pmids\": [\"22190683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Dot1 displays histone chaperone activity independent of its methyltransferase activity: Dot1 can assemble core histones into nucleosomes and facilitate ATP-dependent chromatin-remodeling activity via its nucleosome-binding domain in vitro; this chaperone function regulates histone exchange and nucleosome dynamics at transcribed regions of long genes in vivo.\",\n      \"method\": \"In vitro nucleosome assembly assay; in vitro chromatin remodeling assay; global histone exchange analysis; genetic analysis of cryptic transcription\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution showing chaperone activity, single lab; replicated in global analysis but mechanism partially characterized\",\n      \"pmids\": [\"29339748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DOT1L interacts with MLL fusion partners AF9 and ENL through a specific 10-amino acid region (DOT1L865-874) containing four conserved hydrophobic residues; the entire intact C-terminal domain of AF9/ENL is required for optimal interaction. This interaction is essential for immortalization by MLL-AF9, as alanine mutations at the binding site abrogate transformation.\",\n      \"method\": \"Alanine scanning mutagenesis; biochemical/biophysical binding studies; functional immortalization assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mutagenesis mapping of binding site combined with functional transformation assay; multiple orthogonal methods\",\n      \"pmids\": [\"23996074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dot1-dependent H3K79 methylation is required for Mek1 meiotic checkpoint kinase autophosphorylation (but not Mec1/Tel1-dependent phosphorylation) during meiosis; H3K79me promotes Hop1 activation and proper distribution along meiotic chromosomes at least partly by regulating Pch2 localization. HOP1 overexpression bypasses the Dot1 requirement for checkpoint activation.\",\n      \"method\": \"Genetic manipulation of Dot1 catalytic activity; H3-K79 mutagenesis; Mek1 kinase activity assays; meiotic chromosome spreads; HOP1 overexpression epistasis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic and biochemical dissection of checkpoint kinase cascade with epistasis experiments\",\n      \"pmids\": [\"23382701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Structural analysis by cryo-EM of DOT1L bound to a nucleosome containing site-specifically ubiquitylated H2BK120 reveals that DOT1L engages the nucleosome acidic patch using a variant arginine anchor and adopts a conformation poised for methylation; DOT1L and ubiquitin interact directly through complementary hydrophobic surfaces, explaining how H2BK120ub stimulates DOT1L activity.\",\n      \"method\": \"Cryo-EM structure determination; site-specific ubiquitylation of H2BK120 in reconstituted nucleosomes\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with site-specifically modified substrate; provides atomic-level mechanism\",\n      \"pmids\": [\"30759380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of apo AF10OM-LZ and its complex with the coiled-coil domain of DOT1L reveals the molecular basis for DOT1L-AF10 interaction; zinc stabilizes the complex. Disruption of the DOT1L-AF10 interface abrogates MLL-AF10-associated leukemic transformation.\",\n      \"method\": \"X-ray crystallography; structure-guided mutagenesis; leukemic transformation assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with functional mutagenesis validating the interface in leukemic transformation\",\n      \"pmids\": [\"29563185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DOT1L functions as a cofactor of ERα in breast cancer cell chromatin, where the two proteins co-localize to regulate estrogen target gene transcription. DOT1L blockade reduces H3K79 methylation and ERα/FOXA1 gene expression, blocking proliferation of hormone-responsive and antiestrogen-resistant breast cancer cells.\",\n      \"method\": \"ChIP-seq co-localization; siRNA knockdown and pharmacological inhibition; gene expression analysis; in vivo xenograft\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq co-localization plus functional assays, single lab\",\n      \"pmids\": [\"30775443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOT1L loss (KO), but not catalytic inactivation, causes defects in neural progenitor cell gene expression signature and glial cell specification in ESC differentiation, and exacerbates transcription elongation defects induced by a super elongation complex inhibitor; revealing a catalytic-independent role of DOT1L in transcription elongation and cell-fate determination.\",\n      \"method\": \"DOT1L knockout vs. catalytic-dead knock-in ESCs; neural differentiation assays; transcriptome analysis; super elongation complex inhibitor (KL-2) epistasis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic separation of catalytic vs. non-catalytic function using KO and catalytic dead knock-in; epistasis with SEC inhibitor\",\n      \"pmids\": [\"33077595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOT1L protein stability is regulated by O-GlcNAcylation at evolutionarily conserved S1511, mediated by OGT. O-GlcNAcylation at S1511 prevents binding of the E3 ubiquitin ligase UBE3C, which otherwise promotes DOT1L proteasomal degradation. HBP-enhanced O-GlcNAcylation increases H3K79 methylation and expression of HOXA9/MEIS1 target genes.\",\n      \"method\": \"Affinity purification-mass spectrometry; site-directed mutagenesis of S1511; co-immunoprecipitation of UBE3C-DOT1L; OGT inhibition/HBP pathway manipulation; ChIP for H3K79me\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS identification of modification site, mutagenesis, co-IP, and functional ChIP; multiple orthogonal methods in one study\",\n      \"pmids\": [\"34551297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CBP mediates DOT1L acetylation at K358, stabilizing DOT1L by preventing RNF8 E3 ubiquitin ligase binding and subsequent proteasomal degradation without affecting enzymatic activity. Stabilized DOT1L then catalyzes H3K79 methylation at promoters of SNAIL and ZEB1, promoting EMT and cancer metastasis.\",\n      \"method\": \"Affinity purification-mass spectrometry; co-IP of RNF8-DOT1L; DOT1L K358 acetylation-mimic mutant; ChIP for H3K79me at EMT gene promoters; in vivo metastasis assay\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS identification of acetylation site, co-IP, acetylation-mimic mutagenesis, ChIP, and in vivo assay; multiple methods\",\n      \"pmids\": [\"32042335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Dot1L interacts directly with the transcription factor Zc3h10 and is recruited to promoters of thermogenic genes including Ucp1 in brown adipose tissue; Dot1L methylates H3K79 at these promoters to coactivate gene expression. Dot1L ablation in brown adipocytes (Ucp1-Cre) prevents Ucp1 and other thermogenic gene activation, reduces thermogenic capacity, and promotes adiposity.\",\n      \"method\": \"Co-immunoprecipitation; ChIP; conditional Dot1L KO (Ucp1-Cre); thermogenic gene expression; metabolic phenotyping\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP establishing direct interaction, ChIP, and conditional KO with metabolic phenotype; multiple methods in one study\",\n      \"pmids\": [\"33107819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOT1L depletion in erythroleukemic cells reduces TBP occupancy on thousands of genes and reduces Pol II occupancy at a significant fraction of direct DOT1L-bound target genes, indicating a role in transcription initiation rather than elongation (no effect on Pol II traveling ratio or elongation rate). Mechanistically, the DOT1L complex may regulate initiation by facilitating TFIID recruitment/stabilization; DOT1L also limits SAGA deubiquitinase recruitment to maintain H2Bub1 levels.\",\n      \"method\": \"DOT1L depletion; 4sUDRB-seq (elongation rate); TBP/Pol II ChIP; proteomic and biochemical studies; SAGA complex recruitment assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — orthogonal transcription assays (elongation rate, TBP/Pol II ChIP) plus proteomics; mechanistically informative negative result on elongation\",\n      \"pmids\": [\"34187895\"],\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 and H2BUb play crucial roles specifically in H3K79 di- and trimethylation in vitro and in vivo.\",\n      \"method\": \"In vitro methyltransferase assay with H4K16ac-modified nucleosomes; in vivo methylation state analysis; mechanistic structural/biochemical analysis\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with site-specifically modified histones; mechanistic analysis of allostery with in vivo validation\",\n      \"pmids\": [\"33479126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AF10 (MLLT10) interacts with DOT1L and is required for higher-order H3K79 methylation in somatic cells; AF10-DOT1L interaction (but not a DOT1L-binding-impaired AF10 mutant) maintains H3K79 methylation and acts as a barrier to somatic cell reprogramming by sustaining fibroblast-specific gene programs.\",\n      \"method\": \"Proximity-based labeling proteomics; AF10 KO and re-expression; DOT1L-binding-impaired AF10 mutant rescue; H3K79 methylation western blot; transcriptomic analysis during reprogramming\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proximity proteomics plus structure-function mutagenesis of interaction domain and transcriptomic analysis; multiple methods\",\n      \"pmids\": [\"34215314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Dot1 promotes H2B monoubiquitination through its N-terminus in a methyltransferase-independent manner; increased Dot1 dosage elevates H2Bub1 levels and this is exacerbated by loss of SAGA-DUB deubiquitinase activity, establishing bidirectional crosstalk between Dot1 and H2Bub1.\",\n      \"method\": \"Genetic interaction mapping with increased-dosage DOT1 alleles; H2Bub1 western blot; N-terminal deletion mutants of Dot1\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic interaction plus domain deletion analysis, single lab, two approaches\",\n      \"pmids\": [\"30203048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of Dot1L bound to H2BK34ub nucleosomes reveal that H2BK34-anchored ubiquitin does not directly contact Dot1L (unlike H2BK120ub), but instead induces DNA and histone distortion around the modified site to position Dot1L in a productive conformation, establishing nucleosome distortion as a distinct mechanism by which ubiquitination stimulates Dot1L.\",\n      \"method\": \"Cryo-EM structure determination of Dot1L-H2BK34ub nucleosome complex and H2BK34ub nucleosome alone; site-specific ubiquitylation\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — dual cryo-EM structures providing atomic mechanism; site-specifically modified substrates\",\n      \"pmids\": [\"35739357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DOT1L activity requires ubiquitin and nucleosome acidic patch binding for productive nucleosome engagement; these interactions drive conformational changes that stimulate DOT1L activity. Structure-guided mutations abolishing either ubiquitin or acidic patch binding impair cell proliferation in MV4;11 MLL-rearranged leukemia cells.\",\n      \"method\": \"Bulk and single-molecule biophysical measurements; structure-guided mutagenesis; cancer cell proliferation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — single-molecule biophysics combined with mutagenesis and functional cancer cell assay; multiple orthogonal methods\",\n      \"pmids\": [\"35172132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"H3K79me2 in DOT1L-regulated gene bodies and regulatory elements synergizes to promote expression of chamber-specific genes during cardiogenesis (particularly left ventricle-specific genes); H3K79me2 at specific regulatory elements also contributes to silencing of genes normally not expressed in cardiomyocytes. Embryonic cardiomyocyte-specific Dot1l ablation impairs postnatal cardiomyocyte cell cycle withdrawal.\",\n      \"method\": \"Embryonic cardiomyocyte-specific Dot1l conditional KO; H3K79me2 ChIP-seq; transcriptome analysis; cardiomyocyte cell cycle analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with ChIP-seq and transcriptomics revealing both activating and silencing functions at specific loci\",\n      \"pmids\": [\"36460641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DOT1L directly regulates the transcription of NF-κB1 and NF-κB2 in vascular smooth muscle cells via H3K79me2 enrichment at their loci, which in turn induces expression of CCL5 and CXCL10, promoting atherosclerosis. VSMC-specific Dot1l KO in ApoE-/- mice significantly reduces atherosclerosis progression.\",\n      \"method\": \"VSMC-specific inducible KO mouse crossed with ApoE-/- model; RNA-seq; H3K79me2 ChIP-seq; VSMC phenotyping\",\n      \"journal\": \"European heart journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific conditional KO with H3K79me2 ChIP-seq identifying direct target genes; in vivo disease model\",\n      \"pmids\": [\"35292818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Dot1 binding to chromatin can deregulate heterochromatin-mediated silencing by both H3K79 methylation-dependent and methylation-independent mechanisms; the methylation-independent mechanism requires histone acetyltransferase Gcn5 and can relocalize telomeres away from the nuclear periphery.\",\n      \"method\": \"Targeted Dot1 tethering; H3K79 methylation-dead Dot1 mutant; live-cell telomere imaging; genetic epistasis with Gcn5\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — targeted tethering with catalytic mutant and live imaging; single lab, but two orthogonal approaches\",\n      \"pmids\": [\"21291527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"H3K79 methylation by Dot1 is required for global genomic repair (GGR) but not transcription-coupled repair (TCR) of UV damage in yeast; both mono/di/trimethylation states contribute to GGR, and the mechanism is independent of checkpoint activation or Rad16 expression regulation, suggesting methylated H3K79 serves as a docking site for GGR machinery.\",\n      \"method\": \"Dot1 deletion and H3K79 mutation; GGR vs. TCR assays; checkpoint activation analysis; Rad16 expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific repair pathway dissection with genetic controls; single lab, multiple genetic approaches\",\n      \"pmids\": [\"21460225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DOT1L-methylated H3K79 is involved in binding and recruiting XPC to UV-damage sites for nucleotide excision repair (NER); DOT1L loss impairs NER, leading to accumulation of UV-induced DNA damage and promotion of melanoma development in mice exposed to UV radiation.\",\n      \"method\": \"DOT1L KO mice + UVR; ChIP showing H3K79me at damage sites; XPC recruitment assay; NER efficiency measurement\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse model plus ChIP-based recruitment assay; single lab\",\n      \"pmids\": [\"29343685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DOT1L is recruited by the ENL-containing DOT1L complex to maintain transcription of MLL fusion target genes; MLL-ENL and MLL-AF10 constitutively activate transcription by inducing both AEP (AF4-ENL-P-TEFb)-dependent transcriptional activation and DOT1L-dependent transcriptional maintenance, mostly in the absence of PRC1.\",\n      \"method\": \"Genetic and biochemical analysis of complex membership; gene expression analysis; transformation assays with MLL-ENL and MLL-AF10\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — complex characterization with functional transformation assays, single lab\",\n      \"pmids\": [\"28394257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DOT1L, via H3K79 dimethylation, facilitates histone H4 acetylation, which in turn regulates BRD4 binding to chromatin; BRD4 and DOT1L exist in separate protein complexes but functionally collaborate, especially at highly transcribed genes near superenhancers in MLL leukemia.\",\n      \"method\": \"Quantitative proteomics; chemoproteomics; biochemical fractionation; genetic disruption and small-molecule inhibition of BRD4 and DOT1L; H4 acetylation ChIP\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — quantitative proteomics establishing separate complexes; ChIP establishing H3K79me2-H4ac crosstalk; multiple orthogonal methods\",\n      \"pmids\": [\"27294782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOT1L inhibition in AR-positive prostate cancer cells reduces MYC expression by loss of H3K79 methylation at a distal MYC enhancer bound by AR and DOT1L; reduced MYC upregulates E3 ubiquitin ligases HECTD4 and MYCBP2, which promote AR and MYC proteasomal degradation in a negative feedforward loop.\",\n      \"method\": \"DOT1L knockdown/inhibition in AR+ vs AR- cells; ChIP for H3K79me at MYC enhancer; MYC expression; E3 ligase identification; AR/MYC protein stability assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP establishing enhancer mechanism; E3 ligase identification; feedforward loop validated; multiple methods\",\n      \"pmids\": [\"32814769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SESAME complex-catalyzed H3T11 phosphorylation directly reduces Dot1 binding to chromatin and inhibits Dot1-catalyzed H3K79 trimethylation, thereby repressing autophagy gene transcription; the Reb1 telomere-associated factor recruits SESAME to telomeres to phosphorylate H3T11, preventing invasion of H3K79me3 into heterochromatin to maintain telomere silencing.\",\n      \"method\": \"Chromatin binding assays; H3K79me3 in vitro/in vivo methylation assays; autophagy gene expression assays; ChIP; Reb1 tethering at telomeres\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic chromatin binding and methylation assays with in vivo genetic validation; single lab\",\n      \"pmids\": [\"36473858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"H3K79me3 is selectively enriched at pericentromeric repetitive elements relative to H3K79me2 in mouse ESCs; DOT1L loss compromises pericentromeric satellite repeat transcription, destabilizes pericentromeric heterochromatin, and impairs preimplantation viability. This involves possible coordination between DOT1L and the chromatin remodeler SMARCA5.\",\n      \"method\": \"H3K79me2/me3 ChIP-seq; DOT1L KO ESCs and cleavage-stage embryos; satellite repeat transcription assays; heterochromatin marker analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq with KO ESCs and embryos; coordination with SMARCA5 is proposed but not fully mechanistically established\",\n      \"pmids\": [\"37317657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DOT1L directly regulates macrophage lipid biosynthesis gene programs including central regulators SREBP1 and SREBP2; DOT1L inhibition leads to macrophage hyperactivation, and myeloid-specific Dot1l deficiency reduces atherosclerotic plaque stability in vivo.\",\n      \"method\": \"Selective DOT1L inhibitor in mouse and human macrophages; myeloid-specific Dot1l KO mice; RNA-seq; SREBP pathway analysis; atherosclerosis plaque analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO combined with transcriptomics; SREBP regulation established genetically; single lab\",\n      \"pmids\": [\"36417856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOT1L promotes expression of HoxC transcription factors (HoxC9, HoxC10) in spermatogonial stem cells; H3K79me2 accumulates at HoxC9 and HoxC10 loci, and DOT1L is required for spermatogonial stem cell self-renewal and lifelong spermatogenesis.\",\n      \"method\": \"Conditional DOT1L KO in male germline; H3K79me2 ChIP at HoxC9/HoxC10; spermatogonial stem cell transplantation assay; gene expression analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with transplantation assay establishing stem cell activity, plus ChIP for target loci; multiple methods\",\n      \"pmids\": [\"35738678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DOT1L inhibition in apical progenitors (neural stem cells) increases neurogenic symmetric consumptive divisions over self-renewing asymmetric divisions, reduces activity of EZH2/PRC2 pathway, and converges on increased expression of asparagine synthetase (ASNS); ASNS overexpression phenocopies DOT1L inhibition, linking DOT1L activity to asparagine metabolism and neural stem cell lineage progression.\",\n      \"method\": \"Lineage tracing combined with single-cell RNA-seq of clonally related cells; DOT1L inhibition; ASNS overexpression; PRC2 pathway analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clonal lineage tracing with scRNA-seq; phenocopy experiment with ASNS; single lab\",\n      \"pmids\": [\"37382163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOT1L epigenetically promotes c-Myc transcription via H3K79me2 enrichment at the c-Myc promoter region (-682 to +284); H3K79me2 enrichment at this region is reduced after DOT1L knockdown, and c-Myc restoration rescues cell cycle arrest caused by DOT1L silencing in colorectal cancer cells.\",\n      \"method\": \"ChIP for H3K79me2 at c-Myc promoter; DOT1L siRNA knockdown; c-Myc rescue experiments; cell cycle analysis\",\n      \"journal\": \"Clinical epigenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP at specific promoter plus rescue experiment; single lab\",\n      \"pmids\": [\"31888761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tandem affinity purification of DOT1L-containing complexes revealed that AF9, ENL, and NPM1 are major DOT1L-interacting proteins in mammalian cells; separate purification of AF9-, ENL-, and NPM1-containing complexes by mass spectrometry further defined a DOT1L interaction network suggesting roles in AF9/ENL-mediated transcription, RNA processing, and histone chaperoning via NPM1.\",\n      \"method\": \"Tandem affinity purification; mass spectrometry\",\n      \"journal\": \"The protein journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic complex purification with MS; interactors identified but functional follow-up is limited in this paper\",\n      \"pmids\": [\"20431927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DOT1L is required for proper DNA double-strand break response and repair via homologous recombination (HR) in colorectal cancer cells; DOT1L depletion or inhibition impairs γH2AX phosphorylation and HR repair efficiency, and DOT1L inhibition combined with chemotherapy shows additive effects on cell killing.\",\n      \"method\": \"siRNA knockdown and small-molecule inhibitors; γH2AX assay; HR repair assay; drug combination assays\",\n      \"journal\": \"Clinical epigenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple assays for HR repair with KD and inhibitor; single lab\",\n      \"pmids\": [\"30616689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PARP1 directly binds to the DOT1L gene promoter and promotes DOT1L transcription independently of its enzymatic activity; PARPi-induced PARP1 trapping amplifies this binding, enhancing DOT1L transcription. DOT1L in turn regulates PLCG2 and ABCB1 via H3K79me2, establishing a PARP1-DOT1L-PLCG2/ABCB1 resistance axis.\",\n      \"method\": \"ChIP for PARP1 at DOT1L promoter; RNA sequencing; CUT&Tag for H3K79me2 at PLCG2/ABCB1 loci; PARPi treatment; CDX and PDO models\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and CUT&Tag establishing direct transcriptional regulation; single lab with multiple methods\",\n      \"pmids\": [\"38778348\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DOT1L (KMT4) is the sole histone H3 lysine 79 (H3K79) methyltransferase in eukaryotes, lacking a SET domain and instead methylating H3K79 within the nucleosome core; its activity requires direct engagement of the nucleosome acidic patch (via a variant arginine anchor), is allosterically stimulated by H2BK120 ubiquitination through direct ubiquitin–DOT1L hydrophobic contacts and by H4K16 acetylation through a distinct allosteric mechanism, requires the H4 tail basic patch in trans, and is regulated post-translationally by O-GlcNAcylation (at S1511, opposing UBE3C-mediated degradation) and CBP-mediated K358 acetylation (opposing RNF8-mediated degradation); H3K79me marks active chromatin and mediates diverse processes including DNA damage checkpoint activation (by recruiting 53BP1/Rad9 to breaks via Tudor domain recognition), global genomic nucleotide excision repair, telomeric silencing (by excluding Sir proteins from methylated chromatin), transcription initiation (by stabilizing TFIID/TBP), transcription elongation (via a catalytic-independent scaffolding function), and cell cycle progression, while in leukemia DOT1L is aberrantly recruited to HOX gene loci by MLL fusion proteins (via direct binding to AF9/ENL through DOT1L residues 865–874 and to AF10 via a coiled-coil interaction stabilized by zinc), driving oncogenic H3K79 hypermethylation and leukemic transformation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DOT1L (KMT4) is the sole histone H3 lysine 79 (H3K79) methyltransferase in eukaryotes, acting within the nucleosome core rather than on a histone tail and depositing the H3K79 methylation mark that broadly tracks with transcriptionally active chromatin [#0, #6]. Catalysis requires productive engagement of the nucleosome acidic patch and is regulated by combinatorial cross-talk: H2B monoubiquitination (at K123/K120) is required for H3K79 trimethylation [#7], cryo-EM showing this proceeds through direct ubiquitin–DOT1L hydrophobic contacts for H2BK120ub but through nucleosome distortion for H2BK34ub [#16, #27], while H4K16 acetylation allosterically stimulates the enzyme and the H4 tail basic patch is needed in trans [#4, #24]; abolishing ubiquitin or acidic-patch binding impairs leukemic cell proliferation [#28]. Through H3K79 methylation DOT1L mediates DNA damage checkpoint signaling by recruiting the Rad9/53BP1 Tudor-domain readers to breaks [#3, #5], global genomic nucleotide excision repair via XPC recruitment [#33], telomeric silencing through exclusion of Sir proteins [#0], and transcription initiation by stabilizing TBP/TFIID occupancy [#23]. DOT1L also possesses catalytic-independent functions in transcription elongation, cell-fate determination, and histone chaperoning/nucleosome dynamics [#13, #19]. As a transcriptional coactivator it is recruited by sequence-specific and signaling factors—ERα, Zc3h10, AR, and Wnt/β-catenin components—to methylate H3K79 at target loci controlling estrogen response, thermogenesis, MYC expression, and developmental programs [#9, #18, #22, #36]. In MLL-rearranged leukemia, DOT1L is aberrantly recruited to HOX loci by MLL fusion partners through a defined 10-residue surface binding AF9/ENL [#14] and through a zinc-stabilized coiled-coil interface with AF10, both interactions being required for transformation [#17, #11]. DOT1L abundance is further controlled post-translationally by OGT-mediated O-GlcNAcylation at S1511 opposing UBE3C-driven degradation [#20] and by CBP-mediated K358 acetylation opposing RNF8-driven degradation [#21]. Tissue-specific loss reveals essential physiological roles, including a requirement in cardiomyocytes where DOT1L sustains Dystrophin expression and its loss causes dilated cardiomyopathy [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the first phenotypic role of Dot1, showing it is required for meiotic pachytene checkpoint integrity before its biochemical activity was known.\",\n      \"evidence\": \"Genetic deletion of DOT1 with meiotic progression assays and Pch2/Sir2 localization microscopy in yeast\",\n      \"pmids\": [\"11029058\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the molecular activity underlying the phenotype\", \"Connection to histone methylation not yet known\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the enzyme's substrate—answering what Dot1 does biochemically—by showing it methylates H3K79 in the nucleosome core and that this mark mediates telomeric silencing by controlling Sir protein binding.\",\n      \"evidence\": \"Active-site and H3-K79 mutagenesis with Sir protein ChIP and silencing reporters in yeast\",\n      \"pmids\": [\"12080090\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Sir exclusion by methylation not structurally defined\", \"Mammalian enzyme not yet characterized\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linked H3K79 methylation to the DNA damage response, showing it is required for checkpoint adaptor Rad9 phosphorylation and downstream Rad53 activation, and that Rad9/53BP1 reads the mark via its Tudor domain.\",\n      \"evidence\": \"Genetic deletion/mutation of DOT1, H3-K79, H2B-K123 with Rad53 kinase assays and Rad9 Tudor-domain mutagenesis/ChIP in yeast and human cells\",\n      \"pmids\": [\"15632126\", \"16166626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how methylated K79 is exposed at breaks\", \"Structural basis of Tudor–H3K79me recognition not defined here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Uncovered trans-histone regulation, showing the H4 basic patch and Dot1's own acidic patch are required for H3K79 methylation, defining cross-tail communication in the nucleosome.\",\n      \"evidence\": \"In vitro methyltransferase and binding assays with histone mutants plus in vivo H4 basic-patch mutagenesis in yeast\",\n      \"pmids\": [\"17675446\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic basis of the H4-tail requirement awaited later structures\", \"Did not address ubiquitin dependence\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Confirmed DOT1L as the sole mammalian H3K79 di/trimethyltransferase and connected its occupancy genome-wide to active transcription.\",\n      \"evidence\": \"ChIP-chip and ChIP in Dot1l-null fibroblasts with western blots for methylation states\",\n      \"pmids\": [\"18285465\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal direction between methylation and transcription not resolved\", \"No mechanism for transcription coupling provided\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolved the H2B ubiquitination requirement, showing H2BK123ub is intrinsically required for H3K79 trimethylation independent of confounding histone alterations.\",\n      \"evidence\": \"Systematic alanine-scanning mutagenesis of H2A/H2B with in vivo methylation assays in yeast\",\n      \"pmids\": [\"19667127\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the physical ubiquitin–enzyme contact\", \"Did not explain mono- vs trimethylation control\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined DOT1L's complex membership (DotCom) including MLL fusion partners and Wnt components, framing both its leukemia relevance and a developmental coactivator role.\",\n      \"evidence\": \"Mass spectrometry of purified complex with in vitro methylation and Drosophila RNAi gene-expression assays; complementary TAP-MS in mammalian cells identifying AF9/ENL/NPM1\",\n      \"pmids\": [\"20203130\", \"20431927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional contribution of individual subunits not dissected\", \"NPM1 chaperoning role inferred but not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated tissue-specific physiological requirements—hematopoietic homeostasis, MLL-AF9 leukemia dependence, and cardiac function via Dmd—establishing DOT1L as a context-dependent essential regulator.\",\n      \"evidence\": \"Conditional Dot1l knockout mice, bone-marrow transplantation, oncogene transformation comparisons, and mini-Dmd rescue with locus ChIP\",\n      \"pmids\": [\"21398221\", \"21289070\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate catalytic from scaffolding contributions in each tissue\", \"Target gene selectivity mechanism unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed catalytic-dependent mitotic and genome-stability functions, with catalytic-mutant rescue showing H3K79 methyltransferase activity is required for proper spindle/centrosome function, and a separate methylation-independent histone chaperone activity.\",\n      \"evidence\": \"siRNA with catalytic active/inactive re-expression and mitotic phenotyping in lung cancer cells; in vitro nucleosome assembly/remodeling and histone exchange analysis\",\n      \"pmids\": [\"22190683\", \"29339748\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Chaperone mechanism only partially characterized in vitro\", \"Link between mitotic defects and specific target genes unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapped the AF9/ENL binding determinant to DOT1L residues 865–874, showing this interaction is required for MLL-AF9 immortalization—defining a druggable protein–protein interface in leukemia.\",\n      \"evidence\": \"Alanine-scanning mutagenesis, biophysical binding studies, and immortalization assays\",\n      \"pmids\": [\"23996074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the AF10 interface\", \"Structure of the bound complex not resolved here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided atomic mechanism, showing DOT1L engages the nucleosome acidic patch via a variant arginine anchor and contacts H2BK120-ubiquitin directly through complementary hydrophobic surfaces.\",\n      \"evidence\": \"Cryo-EM of DOT1L bound to site-specifically ubiquitylated H2BK120 nucleosomes\",\n      \"pmids\": [\"30759380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address other ubiquitin sites\", \"Allosteric coupling to catalysis only partially visualized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Crystallized the DOT1L–AF10 coiled-coil interface, showing zinc stabilizes it and its disruption blocks MLL-AF10 transformation, completing the structural picture of leukemic recruitment.\",\n      \"evidence\": \"X-ray crystallography with structure-guided mutagenesis and transformation assays\",\n      \"pmids\": [\"29563185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address how recruitment alters H3K79me genome-wide\", \"AF10's higher-order methylation role addressed separately\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Separated catalytic from non-catalytic roles in development, showing DOT1L loss but not catalytic inactivation disrupts neural/glial differentiation and exacerbates elongation defects—revealing a scaffolding function in elongation and cell fate.\",\n      \"evidence\": \"DOT1L knockout vs catalytic-dead knock-in ESCs with neural differentiation, transcriptomics, and SEC inhibitor epistasis\",\n      \"pmids\": [\"33077595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular partners of the scaffolding function not fully defined\", \"How the non-catalytic role intersects elongation machinery unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined post-translational control of DOT1L abundance through two opposing modification–degradation axes—O-GlcNAcylation at S1511 blocking UBE3C and CBP acetylation at K358 blocking RNF8—linking metabolic and signaling state to H3K79 methylation output.\",\n      \"evidence\": \"AP-MS site mapping, mutagenesis, UBE3C/RNF8 co-IP, and functional ChIP at target loci\",\n      \"pmids\": [\"34551297\", \"32042335\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crosstalk between the two modification axes untested\", \"Upstream signals regulating these modifications in vivo unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Reframed DOT1L's transcriptional role toward initiation, showing depletion reduces TBP and Pol II occupancy without affecting elongation rate, and that H4K16ac allosterically stimulates the enzyme distinctly from ubiquitin.\",\n      \"evidence\": \"4sUDRB-seq, TBP/Pol II ChIP, and proteomics in erythroleukemic cells; in vitro methyltransferase assays with H4K16ac nucleosomes\",\n      \"pmids\": [\"34187895\", \"33479126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How DOT1L stabilizes TFIID mechanistically not resolved\", \"Coordination of H4K16ac and ubiquitin allostery only partially defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established a second mode of ubiquitin stimulation, showing H2BK34ub acts through DNA/histone distortion rather than direct contact, and confirmed acidic-patch and ubiquitin binding are required for leukemic proliferation.\",\n      \"evidence\": \"Cryo-EM of Dot1L-H2BK34ub nucleosomes and single-molecule biophysics with structure-guided mutagenesis in MLL-rearranged cells\",\n      \"pmids\": [\"35739357\", \"35172132\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of each ubiquitin mode in vivo unclear\", \"Distortion mechanism for other modifications untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Expanded DOT1L's physiological reach as a factor-recruited coactivator across cardiogenesis, brown-fat thermogenesis, atherosclerosis, and germline/stem-cell programs, in some cases also silencing genes.\",\n      \"evidence\": \"Tissue-specific conditional Dot1l knockouts with H3K79me2 ChIP-seq and transcriptomics across heart, brown adipose (Zc3h10), VSMC/macrophage, and spermatogonial models\",\n      \"pmids\": [\"36460641\", \"33107819\", \"35292818\", \"36417856\", \"35738678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of locus-specific silencing by an activating mark unresolved\", \"Determinants of tissue-specific target selection unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Positioned DOT1L within transcriptional regulatory loops with c-Myc/MYC and a PARP1-driven resistance axis, showing it both activates oncogenic targets and is itself transcriptionally controlled.\",\n      \"evidence\": \"ChIP/CUT&Tag for H3K79me2 at MYC and PLCG2/ABCB1 loci, PARP1 promoter ChIP, and rescue experiments in colorectal, prostate, and PARPi-resistance models\",\n      \"pmids\": [\"31888761\", \"32814769\", \"38778348\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings without reciprocal validation across models\", \"Generality of the PARP1-DOT1L axis across tumor types untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DOT1L achieves locus-specific target selection—and how its single H3K79 mark can both activate and silence distinct genes within the same cell—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking recruitment factors to context-dependent activation vs silencing\", \"Mechanistic basis of the catalytic-independent scaffolding function incompletely defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 6, 16, 24]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [9, 18, 22, 23]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [4, 16]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 0]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [6, 16, 38]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 23, 9]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 4, 24]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [3, 5, 33, 44]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [11, 14, 17, 36]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [10, 29, 40]}\n    ],\n    \"complexes\": [\"DotCom\"],\n    \"partners\": [\"AF9\", \"ENL\", \"AF10\", \"NPM1\", \"UBE3C\", \"RNF8\", \"OGT\", \"ZC3H10\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}