{"gene":"DNMT3A","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1999,"finding":"Dnmt3a functions as a de novo DNA methyltransferase essential for establishing genome-wide methylation patterns during early embryogenesis and gametogenesis; genetic knockout in mice blocks de novo methylation in ES cells and early embryos but does not affect maintenance of imprinted methylation patterns.","method":"Gene targeting/knockout in mouse ES cells and embryos, bisulfite sequencing","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — genetic reconstitution with defined molecular phenotype, foundational study replicated across many subsequent labs","pmids":["10555141"],"is_preprint":false},{"year":2002,"finding":"Dnmt3a and Dnmt1 functionally cooperate in de novo methylation: Dnmt3a-mediated initial methylation stimulates Dnmt1 activity on the same DNA substrate approximately 5-fold, without requiring physical interaction between the two enzymes (sequential activity suffices).","method":"In vitro methylation assay with purified enzymes, sequential incubation experiments","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified enzymes, two orthogonal experimental designs (sequential vs simultaneous incubation)","pmids":["12383256"],"is_preprint":false},{"year":2013,"finding":"DNMT3A forms a linear heterotetramer with DNMT3L that stimulates its catalytic activity; isolated DNMT3A forms protein filaments that bind multiple DNA molecules in parallel (supporting heterochromatic localization), and DNMT3L disrupts these filaments, redistributing the enzyme toward euchromatin. DNMT3A/3L heterotetramers cooperatively multimerize on DNA, leading to periodic methylation preference.","method":"Biochemical reconstitution, structural analysis, cellular localization studies","journal":"Progress in molecular biology and translational science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical reconstitution and structural analysis, but this is a review/synthesis paper summarizing prior work rather than a primary discovery paper","pmids":["23663978"],"is_preprint":false},{"year":2014,"finding":"DNMT3A mutations causing Tatton-Brown-Rahman overgrowth syndrome alter residues in the PWWP, ADD, and catalytic domains; protein modeling indicates these mutations interfere with domain-domain interactions and histone binding.","method":"Exome sequencing of patient cohort, protein structural modeling","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — human genetics with protein modeling, no direct biochemical reconstitution","pmids":["24614070"],"is_preprint":false},{"year":2014,"finding":"PADI4 citrullination of DNMT3A at a sequence upstream of the PWWP domain stabilizes DNMT3A protein (prevents degradation) and increases its DNA methyltransferase activity; PADI4 physically interacts with DNMT3A both in vitro and in cells.","method":"Co-IP from overexpressed and endogenous cells, in vitro citrullination assay, pulse-chase protein stability assay, RNAi knockdown, bisulfite pyrosequencing of p21 promoter","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods in single lab: biochemical citrullination assay, co-IP, pulse-chase stability, functional methylation readout","pmids":["24957603"],"is_preprint":false},{"year":2016,"finding":"In human epidermal stem cells, Dnmt3a binds active enhancers in an H3K36me3-dependent manner; Dnmt3a associates with p63 to maintain high levels of DNA hydroxymethylation at the center of enhancers in a Tet2-dependent manner, and depletion of Dnmt3a inactivates target enhancers and impairs epidermal stem cell function.","method":"ChIP-seq, genome-wide methylation profiling, siRNA depletion with functional stem cell assays","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal ChIP, genome-wide profiling, functional KD phenotype, multiple orthogonal approaches in single lab","pmids":["27476967"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of DNMT3A-DNMT3L-DNA complex at 2.65 Å shows two DNMT3A monomers simultaneously attacking two CpG dinucleotides separated by 14 bp; Arg836 of the target recognition domain (TRD) makes crucial contacts with CpG to ensure CpG specificity; haematological cancer-associated somatic mutations of substrate-binding residues decrease DNMT3A activity and induce CpG hypomethylation.","method":"X-ray crystallography (2.65 Å), in vitro methylation assays, mutagenesis, cellular transformation assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional mutagenesis and in vitro activity assays; multiple orthogonal methods in single rigorous study","pmids":["29414941"],"is_preprint":false},{"year":2018,"finding":"The R882H DNMT3A mutation reduces overall DNA methylation activity ~40% but does not change DNA binding affinity, protein stability, or subnuclear distribution; instead, R882 mediates indirect readout of flanking sequence preferences, and R882H causes pronounced changes in flanking sequence preference with site-specific activity changes (up to 7-fold reduction at disfavored sequences).","method":"Biochemical methylation assays with purified protein, kinetic analyses with designed substrates, subnuclear localization","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified mutant protein, kinetic analyses, multiple substrate contexts tested","pmids":["29518238"],"is_preprint":false},{"year":2018,"finding":"MeCP2 directly interacts with DNMT3A through MeCP2's transcriptional repression domain and DNMT3A's ADD domain, strongly inhibiting DNMT3A activity in vitro by stabilizing the closed autoinhibitory conformation of DNMT3A; binding of unmodified H3 N-terminal tail to the ADD domain relieves MeCP2-mediated inhibition.","method":"In vitro binding and methylation assays, conformationally-locked DNMT3A variants as biochemical tools, cell overexpression with global methylation measurement","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution, conformationally-locked engineered variants, domain-mapping, cellular functional validation","pmids":["30102379"],"is_preprint":false},{"year":2019,"finding":"NSD1-mediated H3K36me2 is required for recruitment of DNMT3A to intergenic regions; genetic ablation of Nsd1/Nsd2 redistributes DNMT3A to H3K36me3-modified gene bodies and reduces intergenic DNA methylation. The PWWP domain of DNMT3A shows dual recognition of H3K36me2 and H3K36me3, with higher binding affinity toward H3K36me2, abrogated by TBRS-derived missense mutations.","method":"Genome-wide DNMT3A ChIP-seq, bisulfite sequencing, genetic Nsd1/Nsd2 ablation, in vitro histone peptide binding assays with PWWP domain","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide profiling with genetic perturbation, in vitro domain binding assays, validated in multiple cell types and patient samples","pmids":["31485078"],"is_preprint":false},{"year":2019,"finding":"Mutation of the PWWP domain (D329A) in DNMT3A in vivo causes redistribution of DNMT3A activity from H3K36me3-marked gene bodies to H3K27me3-marked and bivalent chromatin domains, resulting in progressive DNA hypermethylation at developmental regulatory gene loci and their de-repression in adult hypothalamus.","method":"Mouse knock-in model, whole-genome bisulfite sequencing, non-CpG methylation profiling as marker of de novo activity","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model with genome-wide bisulfite sequencing and multiple molecular readouts","pmids":["31015495"],"is_preprint":false},{"year":2019,"finding":"DNMT3A knockout alone perturbs regional (not global) mitochondrial DNA methylation patterns, predominantly at L-strand non-CpG sites at gene-gene boundaries; overexpression of DNMT3A increases mtDNA methylation and strand bias; mtDNA methylation at gene bodies and boundaries negatively correlates with mitochondrial transcript abundance.","method":"Bisulfite sequencing with strand-specific mapping, MeDIP, FspEI digestion, HPLC-MS, DNMT3A knockout and overexpression","journal":"Genome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (bisulfite, MeDIP, enzymatic digestion, mass spec), single lab","pmids":["31537639"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM structure of DNMT3A2-DNMT3B3-nucleosome complex shows the catalytic-like domain of accessory DNMT3B3 binds to the acidic patch of the nucleosome core, orienting DNMT3A2 binding to linker DNA; steric constraints suggest nucleosomal DNA must be repositioned for de novo methylation to occur.","method":"Cryo-electron microscopy structure determination","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure of ternary complex providing direct mechanistic insight into nucleosome engagement","pmids":["32968275"],"is_preprint":false},{"year":2020,"finding":"Structural characterization of wild-type and R882H-mutated DNMT3A bound to DNA substrates shows: the TRD loop recognizes CpG in a +1 flanking site-dependent manner; R882H reduces DNA binding at the homodimeric interface and weakens the molecular link between homodimeric interface and TRD loop, enhancing TRD loop dynamics and compromising enzymatic activity, CpG specificity, and flanking sequence preference.","method":"X-ray crystallography, in vitro methylation assays with multiple DNA substrates","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures of both WT and mutant complexed with DNA, supported by in vitro biochemical validation","pmids":["32385248"],"is_preprint":false},{"year":2020,"finding":"DNMT3A methylates the Dusp4 promoter using S-adenosylmethionine derived from apoptotic cell-derived methionine during macrophage efferocytosis, repressing Dusp4 expression and enabling sustained ERK phosphorylation required for the prostaglandin E2-TGFβ1 pro-resolving pathway; bone-marrow DNMT3A deletion blocks this resolution cascade.","method":"Conditional bone-marrow DNMT3A knockout mice, bisulfite sequencing, metabolic tracing, in vitro efferocytosis assays","journal":"Nature metabolism","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined molecular mechanism, bisulfite sequencing of target locus, metabolic tracing in single rigorous study","pmids":["35361955"],"is_preprint":false},{"year":2020,"finding":"DNMT3A methylates MAP1LC3 gene loci upon autophagy stimulation, causing long-term transcriptional repression of MAP1LC3 isoforms (key autophagy components), providing an epigenetic memory of prior autophagy induction.","method":"DNA methylation assays, ChIP, siRNA knockdown, in vivo mouse/zebrafish models","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and bisulfite sequencing at specific loci, in vitro and in vivo validation, single lab","pmids":["32876528"],"is_preprint":false},{"year":2020,"finding":"DNMT3A preferentially methylates CpG and non-CpG sites with a 3'-pyrimidine flanking preference (sequence preference for TNC[G/A]CC context); this inherent enzymatic sequence preference directly shapes the genomic DNA methylation landscape as shown by reintroduction into triple-knockout cells.","method":"In vitro methylation of randomized DNA sequences followed by deep bisulfite sequencing; validation using triple-knockout cell reintroduction experiments","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic in vitro biochemical assay with deep sequencing readout, validated by orthogonal cellular experiment","pmids":["32543182"],"is_preprint":false},{"year":2021,"finding":"DNMT3A inactivation in macrophages amplifies heparin-binding EGF-like growth factor (HB-EGF) release, which paracrinally activates cardiac fibroblasts and increases cardiac fibrosis, identifying a mechanism linking DNMT3A CHIP mutations to heart failure progression.","method":"DNMT3A KO in macrophages, co-culture with fibroblasts, conditioned medium experiments, transcriptomic profiling","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway identified through KO with specific secreted factor identification, single lab","pmids":["38242884"],"is_preprint":false},{"year":2021,"finding":"DNMT3A deletion in CAR T cells prevents exhaustion by blocking epigenetic silencing of genes (including CD28, CCR7, TCF7, LEF1) that maintain T cell multipotency; genome-wide DNA methylation profiling defined the atlas of DNMT3A-targeted epigenetically silenced genes during exhaustion.","method":"CRISPR KO of DNMT3A in CAR T cells, genome-wide bisulfite sequencing, in vitro and in vivo tumor challenge assays","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genome-wide methylation profiling with functional KO and in vivo validation, multiple orthogonal approaches","pmids":["34788079"],"is_preprint":false},{"year":2022,"finding":"DNMT3A coordinates mRNA splicing by recruiting the core spliceosome protein SF3B1 to RNA polymerase and mRNA in response to differentiation stimuli; this function is independent of DNMT3A's DNA methyltransferase catalytic activity and is required for stem cell exit from the stem state.","method":"Co-IP of DNMT3A with SF3B1 and RNA polymerase, loss-of-function experiments, RNA-seq splicing analysis, catalytic-dead mutant rescue experiments","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP demonstrating protein-protein interaction, catalytic-dead mutant establishing independence from methyltransferase activity, functional phenotype in stem cells","pmids":["37024683"],"is_preprint":false},{"year":2022,"finding":"DNMT3A interacts with spliceosome component SF3B1 and RNA Polymerase to influence mRNA processing, with the DNA methylation function of DNMT3A not required for this splicing role; loss of DNMT3A impairs splicing efficiency during stem cell activation.","method":"Co-IP, splicing efficiency analysis by RNA-seq, catalytic mutant experiments","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, complementary catalytic-mutant rescue, genome-wide RNA-seq splicing analysis","pmids":["37024683"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of DNMT3A1's UDR fragment complexed with H2AK119ub1-modified nucleosome shows DNMT3A1 contacts the H2A-H2B acidic patch, a surface groove formed by H2A and H3, nucleosomal DNA, and H2AK119ub1; DNMT3A1 UDR competes with JARID2 (a PRC2 cofactor) for nucleosome binding.","method":"Cryo-EM structure determination, biochemical competition assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure with biochemical competition assay validation, single lab","pmids":["39043678"],"is_preprint":false},{"year":2022,"finding":"Base editor scanning of DNMT3A in situ identified mutations throughout the protein that perturb function; mutations at an interdomain interface block allosteric activation; mutations in the PWWP domain modulate enzyme activity through altered PWWP domain DNA affinity (a noncanonical function) rather than altered histone recognition or protein stability.","method":"Base editor scanning with DNA methylation reporter, in vitro histone binding assays, protein stability measurements","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — systematic in situ mutational scanning with functional readout, orthogonal in vitro validation of mechanism, single lab","pmids":["36266353"],"is_preprint":false},{"year":2022,"finding":"DNMT3A R836 and N838 residues mediate CpG guanine recognition and flanking sequence readout: R836 changes conformation depending on flanking sequence, contacting either CpG guanine or the +1/+2 flank and coupling CpG recognition to flanking sequence preference; L883 reduces DNMT3A activity by mediating DNMT3A-specific DNA interactions of the RD loop.","method":"In vitro methylation assays with randomized sequence contexts, structure-guided mutagenesis, kinetic analyses","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with structure-guided mutagenesis, quantitative kinetic analyses, multiple variant comparisons","pmids":["36067881"],"is_preprint":false},{"year":2022,"finding":"CEBPA interacts specifically with the long splice isoform DNMT3A (but not DNMT3A2), blocking DNMT3A access to DNA substrate and inhibiting its methyltransferase activity; AML-associated CEBPA mutations (e.g., CEBPAN321D) disrupt this interaction and cause aberrant DNA hypermethylation of PRC2 target genes.","method":"Co-IP, in vitro methylation inhibition assay, bisulfite sequencing of target loci, isoform-specific interaction mapping","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — biochemical inhibition assay, co-IP, isoform specificity mapping, cellular methylation profiling, single rigorous study","pmids":["35080973"],"is_preprint":false},{"year":2022,"finding":"H3K36me3 directly stimulates linker DNA methylation by DNMT3A in a manner independent of the DNMT3A PWWP domain, likely by preventing H3-tail interaction with linker DNA; H3K4me3 absence promotes linker DNA methylation by enabling H3-tail binding to the ADD domain and relieving autoinhibition.","method":"In vitro methylation of recombinant mononucleosomes containing defined histone modifications, DNMT3A and domain mutant comparisons","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined modified mononucleosomes and domain mutants, mechanistically informative","pmids":["35236925"],"is_preprint":false},{"year":2022,"finding":"Arsenic atoms directly bind to the cysteine-rich ADD domain of DNMT3A, triggering ubiquitin- and proteasome-mediated DNMT3A degradation and genome-wide DNA hypomethylation in embryonic fibroblasts.","method":"Direct binding assay (arsenic to ADD domain), proteasome inhibitor rescue, ubiquitination assay, genome-wide bisulfite sequencing","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding demonstrated with domain construct, degradation pathway validated pharmacologically, single lab","pmids":["35373418"],"is_preprint":false},{"year":2023,"finding":"H3.3G34R mutation severely decreases H3K36me2 on the mutant H3.3 tail, impairing recruitment of DNMT3A and its redistribution on chromatin, leading to loss of non-CG methylation at neuronal genes and ectopic CG methylation, causing neuroinflammation and neurodegeneration.","method":"H3.3G34R/V/W knock-in mice, genome-wide chromatin profiling, DNMT3A ChIP, bisulfite sequencing for CG and CH methylation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knock-in mouse model, genome-wide profiling of DNMT3A chromatin redistribution, multiple orthogonal readouts","pmids":["36931244"],"is_preprint":false},{"year":2024,"finding":"DNMT3A R882H/C hotspot mutations enhance intermolecular contacts leading to DNMT3A polymerization (oligomerization); this aberrant oligomerization has a dominant-negative effect by reducing substrate access; introducing DNMT3B-converting mutations inhibits R882H/R882C-triggered polymerization and eliminates the dominant-negative effect.","method":"X-ray crystallography, biochemical oligomerization assays, cellular and genomic DNA methylation analyses with engineered mutations","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures with biochemical and cellular validation, mechanistic mutagenesis rescue experiments, single rigorous study","pmids":["38600075"],"is_preprint":false},{"year":2025,"finding":"Dnmt3aR878H/+ mutant HSPCs have increased mitochondrial respiration and elevated mitochondrial membrane potential (Δψm) compared to wild-type; this metabolic reprogramming underlies their competitive advantage and can be selectively targeted by long-chain alkyl-TPP molecules (MitoQ, d-TPP) that accumulate in mitochondria of high-Δψm cells, causing apoptosis and ablating the selective advantage.","method":"Murine Dnmt3aR878H/+ model, oxidative phosphorylation functional assays, mitochondrial membrane potential measurement, in vivo MitoQ treatment with competitive transplantation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional metabolic assays, in vivo competitive transplantation, pharmacological intervention with mechanistic readout, multiple orthogonal approaches","pmids":["40240771"],"is_preprint":false},{"year":2025,"finding":"Dnmt3aR878H/+ HSPCs have increased mitochondrial respiration compared to wild-type; metformin reduces their competitive advantage by enhancing methylation potential and reversing aberrant CpG DNA methylation and H3K27me3 profiles in mutant HSPCs.","method":"Murine competitive transplantation, multi-omics (DNA methylation, histone modification, metabolomics), metformin treatment, prime-edited human DNMT3AR882H HSPCs","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multi-omics with genetic and pharmacological validation, replicated in human prime-edited HSPCs","pmids":["40240595"],"is_preprint":false},{"year":2013,"finding":"STAT4 establishes H3K4 methylation and Jmjd3 recruitment at target loci, reducing H3K27me3 and displacing DNMT3A; DNMT3A has an obligate role in repressing Th1 gene expression, and loss of both STAT4 and DNMT3A in T cells recovers Th1 gene expression sufficient to increase IFN-γ production.","method":"ChIP for DNMT3A at target loci, conditional Dnmt3a knockout mice, IFN-γ production assays, double-KO epistasis","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating DNMT3A occupancy at Th1 gene loci, functional epistasis with STAT4, single lab","pmids":["23772023"],"is_preprint":false},{"year":2022,"finding":"YAP/TAZ interact with and recruit DNMT3A to the CDH1 promoter CpG island, generating promoter hypermethylation that silences CDH1 (E-cadherin) and promotes epithelial-to-mesenchymal transition and gallbladder cancer metastasis; this metastasis-promoting effect depends on DNMT3A's DNA methyltransferase activity.","method":"Co-IP of DNMT3A with YAP/TAZ, ChIP at CDH1 promoter, methylation-specific PCR/bisulfite sequencing, methyltransferase-dead mutant rescue experiments","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ChIP demonstrating recruitment, catalytic mutant establishing enzymatic requirement, bisulfite sequencing of target locus","pmids":["38380551"],"is_preprint":false}],"current_model":"DNMT3A is a de novo DNA methyltransferase whose PWWP domain dually recognizes H3K36me2/me3 for chromatin targeting (with higher affinity for H3K36me2 at intergenic regions), whose ADD domain senses the unmodified H3 tail to relieve autoinhibition, and whose catalytic domain methylates CpG dinucleotides with flanking sequence preferences determined by flexible TRD and RD loop interactions; it forms heterotetramers with DNMT3L that stimulate activity and redirect localization, and the AML hotspot R882H/C mutations promote aberrant polymerization causing dominant-negative hypomethylation; beyond DNA methylation, DNMT3A also coordinates pre-mRNA splicing via SF3B1 recruitment in a methylation-independent manner, is stabilized by PADI4-mediated citrullination, is inhibited by MeCP2 binding to the ADD domain, and is recruited to specific loci by transcription factors including YAP/TAZ and inhibited by CEBPA."},"narrative":{"mechanistic_narrative":"DNMT3A is a de novo DNA methyltransferase that establishes genome-wide CpG methylation patterns during embryogenesis and gametogenesis, acting upstream of and functionally cooperating with the maintenance enzyme DNMT1 [PMID:10555141, PMID:12383256]. Catalysis proceeds through a target recognition domain in which Arg836/Asn838 contact the CpG guanine and couple base recognition to a 3'-pyrimidine flanking-sequence preference, while the RD loop (L883) tunes DNMT3A-specific DNA contacts; this intrinsic sequence preference shapes the cellular methylation landscape [PMID:32543182, PMID:36067881, PMID:29414941]. Chromatin targeting is governed by the PWWP domain, which reads H3K36me2/me3 with higher affinity for the NSD1-deposited intergenic H3K36me2 mark, while the ADD domain senses the unmodified H3 tail to relieve an autoinhibitory closed conformation, and H3K36me3 further stimulates linker-DNA methylation independently of the PWWP domain by displacing the H3 tail [PMID:31485078, PMID:35236925]. Engagement of nucleosomes is direct: DNMT3A contacts the H2A-H2B acidic patch and the H2AK119ub1 mark, with accessory subunits orienting catalysis on linker DNA [PMID:32968275, PMID:39043678]. Activity is modulated by multiple partners—DNMT3L heterotetramers stimulate and redistribute the enzyme [PMID:23663978], PADI4 citrullination stabilizes it and boosts activity [PMID:24957603], MeCP2 binds the ADD domain to lock the autoinhibitory state [PMID:30102379], and CEBPA and arsenic respectively block substrate access and trigger degradation [PMID:35080973, PMID:35373418]—while transcription factors such as p63 and YAP/TAZ recruit it to specific loci [PMID:27476967, PMID:38380551]. Beyond methylation, DNMT3A coordinates pre-mRNA splicing by recruiting SF3B1 and RNA polymerase in a catalysis-independent manner required for stem-cell state exit [PMID:37024683]. Germline DNMT3A mutations cause Tatton-Brown-Rahman overgrowth syndrome by disrupting domain-domain interactions and histone binding [PMID:24614070], and the AML/clonal-hematopoiesis hotspot R882H/C mutations impair flanking-sequence readout and drive aberrant polymerization that exerts a dominant-negative reduction of methylation [PMID:29518238, PMID:32385248, PMID:38600075].","teleology":[{"year":1999,"claim":"Established that DNMT3A is the enzyme responsible for setting up de novo methylation rather than maintaining it, defining its developmental role.","evidence":"Gene targeting/knockout in mouse ES cells and embryos with bisulfite sequencing","pmids":["10555141"],"confidence":"High","gaps":["Did not resolve how DNMT3A is targeted to specific loci","Mechanism of cooperation with maintenance machinery undefined"]},{"year":2002,"claim":"Showed DNMT3A and DNMT1 cooperate through sequential activity, with de novo methylation priming maintenance methylation without physical contact.","evidence":"In vitro methylation assays with purified enzymes, sequential vs simultaneous incubation","pmids":["12383256"],"confidence":"High","gaps":["Cellular relevance of in vitro stimulation not established","No structural basis provided"]},{"year":2013,"claim":"Defined DNMT3A/DNMT3L heterotetramers as a regulatory module that stimulates activity and redistributes the enzyme from heterochromatic filaments toward euchromatin.","evidence":"Biochemical reconstitution, structural and cellular localization analysis (review/synthesis)","pmids":["23663978"],"confidence":"Medium","gaps":["Synthesis paper rather than single primary discovery","Physiological role of filament formation in vivo unclear"]},{"year":2013,"claim":"Placed DNMT3A in T-cell lineage control by showing it represses Th1 genes antagonistically to STAT4-driven chromatin remodeling.","evidence":"DNMT3A ChIP at target loci, conditional knockout, double-KO epistasis with IFN-γ assays","pmids":["23772023"],"confidence":"Medium","gaps":["Recruitment mechanism to Th1 loci not defined","Single lab, no structural data"]},{"year":2014,"claim":"Linked DNMT3A to human overgrowth disease (Tatton-Brown-Rahman syndrome) and implicated PWWP/ADD/catalytic domain interactions in pathogenesis.","evidence":"Exome sequencing of patient cohort with protein structural modeling","pmids":["24614070"],"confidence":"Medium","gaps":["No direct biochemical reconstitution of mutant activity","Functional consequence inferred from modeling"]},{"year":2014,"claim":"Identified PADI4 citrullination as a post-translational mechanism stabilizing DNMT3A and enhancing its methyltransferase activity.","evidence":"Co-IP, in vitro citrullination assay, pulse-chase stability, bisulfite pyrosequencing","pmids":["24957603"],"confidence":"High","gaps":["Citrullinated residues' structural effect not resolved","Genome-wide impact untested"]},{"year":2016,"claim":"Demonstrated locus-specific recruitment via transcription factor partnership, with p63 directing DNMT3A to active enhancers to maintain epidermal stem cell function.","evidence":"ChIP-seq, genome-wide methylation profiling, siRNA depletion with stem cell assays","pmids":["27476967"],"confidence":"High","gaps":["Mechanism coupling DNMT3A binding to hydroxymethylation maintenance incomplete","Direct p63-DNMT3A contact not structurally mapped"]},{"year":2018,"claim":"Provided the catalytic mechanism: a structure of DNMT3A-DNMT3L-DNA revealing dual CpG attack and the Arg836-mediated basis of CpG specificity, with cancer mutations causing hypomethylation.","evidence":"X-ray crystallography at 2.65 Å, in vitro methylation, mutagenesis, transformation assay","pmids":["29414941"],"confidence":"High","gaps":["Nucleosomal substrate engagement not captured","Flanking-sequence dependence not fully resolved"]},{"year":2018,"claim":"Defined the R882H AML mutation mechanism as altered flanking-sequence preference rather than loss of DNA binding or stability.","evidence":"Biochemical methylation and kinetic assays with purified mutant protein, subnuclear localization","pmids":["29518238"],"confidence":"High","gaps":["Did not explain dominant-negative behavior structurally","In vivo consequence of altered preference untested here"]},{"year":2018,"claim":"Established MeCP2 as a direct inhibitor that locks DNMT3A in its autoinhibited conformation via the ADD domain, relieved by unmodified H3 tail binding.","evidence":"In vitro binding/methylation assays, conformationally-locked DNMT3A variants, cellular methylation","pmids":["30102379"],"confidence":"High","gaps":["Genomic loci affected by MeCP2 inhibition not mapped","Physiological contexts of regulation unclear"]},{"year":2019,"claim":"Identified NSD1-deposited H3K36me2 as the recruitment signal directing DNMT3A to intergenic regions, with the PWWP domain showing dual H3K36me2/me3 recognition.","evidence":"Genome-wide ChIP-seq, bisulfite sequencing, Nsd1/Nsd2 ablation, PWWP peptide binding assays","pmids":["31485078"],"confidence":"High","gaps":["Quantitative contribution of me2 vs me3 in vivo not fully partitioned","Connection to disease mutations only inferred"]},{"year":2019,"claim":"Showed in vivo that PWWP-domain integrity restrains DNMT3A from Polycomb/bivalent chromatin, preventing aberrant hypermethylation and gene de-repression.","evidence":"Mouse D329A knock-in, whole-genome and non-CpG bisulfite sequencing","pmids":["31015495"],"confidence":"High","gaps":["Generality across tissues beyond hypothalamus untested","Link to human TBRS phenotypes indirect"]},{"year":2019,"claim":"Extended DNMT3A function to mitochondrial DNA, where it shapes regional, strand-biased methylation correlating with transcript abundance.","evidence":"Strand-specific bisulfite sequencing, MeDIP, FspEI digestion, HPLC-MS, KO and overexpression","pmids":["31537639"],"confidence":"Medium","gaps":["Mechanism of mitochondrial import/targeting unknown","Functional consequence of mtDNA methylation not causally tested"]},{"year":2020,"claim":"Resolved nucleosome engagement: cryo-EM of a DNMT3A2-DNMT3B3-nucleosome complex showed accessory-domain anchoring to the acidic patch orients catalysis on linker DNA.","evidence":"Cryo-EM structure determination","pmids":["32968275"],"confidence":"High","gaps":["Conformational change repositioning nucleosomal DNA not directly observed","Catalytically engaged state not captured"]},{"year":2020,"claim":"Resolved how R882H structurally compromises catalysis—weakening the dimer-interface-to-TRD-loop coupling and increasing loop dynamics.","evidence":"X-ray crystallography of WT and mutant with DNA, in vitro methylation","pmids":["32385248"],"confidence":"High","gaps":["Dominant-negative polymerization not yet explained","Cellular consequence not measured here"]},{"year":2020,"claim":"Defined the intrinsic catalytic sequence preference (3'-pyrimidine, TNC[G/A]CC) that directly patterns the genomic methylome.","evidence":"In vitro methylation of randomized DNA with deep bisulfite sequencing, triple-KO reintroduction","pmids":["32543182"],"confidence":"High","gaps":["Interplay of intrinsic preference with chromatin targeting in vivo not separated","Non-CpG preference physiological role untested"]},{"year":2020,"claim":"Connected DNMT3A to inflammation resolution: it methylates Dusp4 using apoptotic-cell-derived methionine during efferocytosis to sustain pro-resolving signaling.","evidence":"Conditional bone-marrow KO mice, bisulfite sequencing, metabolic tracing, efferocytosis assays","pmids":["35361955"],"confidence":"High","gaps":["Targeting mechanism to Dusp4 promoter not defined","Generalizability beyond macrophages untested"]},{"year":2020,"claim":"Revealed an epigenetic-memory role: DNMT3A methylates MAP1LC3 loci to durably repress autophagy genes after autophagy induction.","evidence":"DNA methylation assays, ChIP, siRNA knockdown, mouse/zebrafish models","pmids":["32876528"],"confidence":"Medium","gaps":["Recruitment trigger to MAP1LC3 loci unclear","Single lab, locus-specific evidence"]},{"year":2021,"claim":"Showed DNMT3A loss in CAR T cells prevents exhaustion by blocking methylation-driven silencing of multipotency genes, defining a therapeutic methylation atlas.","evidence":"CRISPR KO in CAR T cells, genome-wide bisulfite sequencing, in vivo tumor challenge","pmids":["34788079"],"confidence":"High","gaps":["Direct mechanism of exhaustion-gene targeting incomplete","Long-term safety of DNMT3A loss not addressed"]},{"year":2021,"claim":"Linked clonal-hematopoiesis DNMT3A loss to cardiac fibrosis via amplified HB-EGF release activating fibroblasts.","evidence":"Macrophage KO, fibroblast co-culture, conditioned medium, transcriptomics","pmids":["38242884"],"confidence":"Medium","gaps":["Methylation target controlling HB-EGF not pinpointed","Single lab mechanistic chain"]},{"year":2022,"claim":"Uncovered a methylation-independent function: DNMT3A recruits SF3B1 and RNA polymerase to coordinate splicing required for stem-cell state exit.","evidence":"Reciprocal co-IP, catalytic-dead mutant rescue, RNA-seq splicing analysis","pmids":["37024683"],"confidence":"High","gaps":["Structural basis of SF3B1 interaction unknown","Which transcripts depend on this function in vivo unclear"]},{"year":2022,"claim":"Mapped nucleosome recognition via H2AK119ub1: DNMT3A1 UDR contacts the acidic patch and ubiquitin mark, competing with the PRC2 cofactor JARID2.","evidence":"Cryo-EM structure, biochemical competition assays","pmids":["39043678"],"confidence":"High","gaps":["Functional outcome of PRC2 competition in vivo untested","Isoform-specific UDR role not fully resolved"]},{"year":2022,"claim":"Systematic mutational scanning identified an interdomain interface controlling allosteric activation and a noncanonical PWWP-DNA-affinity function distinct from histone reading.","evidence":"Base editor scanning with methylation reporter, in vitro histone binding, stability assays","pmids":["36266353"],"confidence":"High","gaps":["Structural detail of interdomain allostery not solved","Disease relevance of identified variants partly untested"]},{"year":2022,"claim":"Dissected CpG-guanine recognition and flanking readout at residue level (R836 conformational switching, N838, L883).","evidence":"In vitro methylation with randomized contexts, structure-guided mutagenesis, kinetics","pmids":["36067881"],"confidence":"High","gaps":["Coupling to chromatin context not addressed","Effect of disease mutations on these residues only inferred"]},{"year":2022,"claim":"Identified isoform-specific inhibition: CEBPA blocks long-isoform DNMT3A substrate access, and AML CEBPA mutations relieve this to cause PRC2-target hypermethylation.","evidence":"Co-IP, in vitro inhibition assay, isoform mapping, bisulfite sequencing","pmids":["35080973"],"confidence":"High","gaps":["Structural basis of isoform-selective binding unresolved","In vivo contribution to leukemogenesis not quantified"]},{"year":2022,"claim":"Showed H3K36me3 directly stimulates linker-DNA methylation independent of the PWWP domain, while absence of H3K4me3 relieves ADD autoinhibition.","evidence":"In vitro methylation of defined modified mononucleosomes with domain mutants","pmids":["35236925"],"confidence":"High","gaps":["In vivo separation of these contributions untested","Mechanism by which H3K36me3 displaces H3 tail inferred"]},{"year":2022,"claim":"Established YAP/TAZ-directed recruitment of DNMT3A to the CDH1 promoter, driving E-cadherin silencing and cancer metastasis in a catalysis-dependent manner.","evidence":"Co-IP, ChIP, methylation-specific PCR/bisulfite, methyltransferase-dead rescue","pmids":["38380551"],"confidence":"Medium","gaps":["Direct vs indirect YAP/TAZ-DNMT3A contact unclear","Single lab, single cancer context"]},{"year":2022,"claim":"Identified arsenic binding to the ADD domain as a trigger for proteasomal DNMT3A degradation and genome-wide hypomethylation.","evidence":"Direct binding assay, proteasome inhibitor rescue, ubiquitination assay, bisulfite sequencing","pmids":["35373418"],"confidence":"Medium","gaps":["E3 ligase mediating degradation not identified","Single cell-type validation"]},{"year":2023,"claim":"Demonstrated in vivo that loss of substrate H3K36me2 (H3.3G34R) prevents DNMT3A recruitment, causing CG/CH methylation defects and neurodegeneration.","evidence":"H3.3G34R/V/W knock-in mice, chromatin profiling, DNMT3A ChIP, CG/CH bisulfite sequencing","pmids":["36931244"],"confidence":"High","gaps":["Causality between methylation loss and neuroinflammation not fully dissected","Therapeutic reversibility untested"]},{"year":2024,"claim":"Explained the dominant-negative mechanism of R882H/C as enhanced intermolecular polymerization that occludes substrate, reversible by DNMT3B-converting mutations.","evidence":"X-ray crystallography, oligomerization assays, cellular/genomic methylation with engineered mutants","pmids":["38600075"],"confidence":"High","gaps":["In vivo polymerization dynamics not visualized","Therapeutic targeting of polymerization untested"]},{"year":2025,"claim":"Revealed a metabolic vulnerability of R882H-equivalent mutant HSPCs—elevated mitochondrial respiration and membrane potential—targetable pharmacologically.","evidence":"Murine Dnmt3aR878H/+ model, OXPHOS assays, membrane potential, in vivo MitoQ/metformin treatment, prime-edited human HSPCs","pmids":["40240771","40240595"],"confidence":"High","gaps":["Causal link between methylation defect and metabolic shift incompletely defined","Clinical translation of pharmacological targeting untested"]},{"year":null,"claim":"How DNMT3A's intrinsic sequence preference, chromatin reader domains, transcription-factor recruitment, post-translational modifications, and methylation-independent splicing role are integrated into a single locus-selection logic in vivo remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No unified model linking targeting inputs to genome-wide outcome","Structural basis of methylation-independent SF3B1/RNA Pol interaction unknown","Mechanism partitioning nuclear vs mitochondrial DNMT3A undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[0,6,16,23]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[6,16,22]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[9,25,21]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,16,14]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[19,20]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,7,10]},{"term_id":"GO:0000228","term_label":"nuclear 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DNA methylation is coordinated with methylation of histones (PubMed:12138111, PubMed:16357870, PubMed:30478443). It modifies DNA in a non-processive manner and also methylates non-CpG sites (PubMed:12138111, PubMed:16357870, PubMed:30478443). May preferentially methylate DNA linker between 2 nucleosomal cores and is inhibited by histone H1 (By similarity). Plays a role in paternal and maternal imprinting (By similarity). Required for methylation of most imprinted loci in germ cells (By similarity). Acts as a transcriptional corepressor for ZBTB18 (By similarity). Recruited to trimethylated 'Lys-36' of histone H3 (H3K36me3) sites (By similarity). Can actively repress transcription through the recruitment of HDAC activity (By similarity). 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cells and embryos, bisulfite sequencing\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genetic reconstitution with defined molecular phenotype, foundational study replicated across many subsequent labs\",\n      \"pmids\": [\"10555141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Dnmt3a and Dnmt1 functionally cooperate in de novo methylation: Dnmt3a-mediated initial methylation stimulates Dnmt1 activity on the same DNA substrate approximately 5-fold, without requiring physical interaction between the two enzymes (sequential activity suffices).\",\n      \"method\": \"In vitro methylation assay with purified enzymes, sequential incubation experiments\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified enzymes, two orthogonal experimental designs (sequential vs simultaneous incubation)\",\n      \"pmids\": [\"12383256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DNMT3A forms a linear heterotetramer with DNMT3L that stimulates its catalytic activity; isolated DNMT3A forms protein filaments that bind multiple DNA molecules in parallel (supporting heterochromatic localization), and DNMT3L disrupts these filaments, redistributing the enzyme toward euchromatin. DNMT3A/3L heterotetramers cooperatively multimerize on DNA, leading to periodic methylation preference.\",\n      \"method\": \"Biochemical reconstitution, structural analysis, cellular localization studies\",\n      \"journal\": \"Progress in molecular biology and translational science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical reconstitution and structural analysis, but this is a review/synthesis paper summarizing prior work rather than a primary discovery paper\",\n      \"pmids\": [\"23663978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DNMT3A mutations causing Tatton-Brown-Rahman overgrowth syndrome alter residues in the PWWP, ADD, and catalytic domains; protein modeling indicates these mutations interfere with domain-domain interactions and histone binding.\",\n      \"method\": \"Exome sequencing of patient cohort, protein structural modeling\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — human genetics with protein modeling, no direct biochemical reconstitution\",\n      \"pmids\": [\"24614070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PADI4 citrullination of DNMT3A at a sequence upstream of the PWWP domain stabilizes DNMT3A protein (prevents degradation) and increases its DNA methyltransferase activity; PADI4 physically interacts with DNMT3A both in vitro and in cells.\",\n      \"method\": \"Co-IP from overexpressed and endogenous cells, in vitro citrullination assay, pulse-chase protein stability assay, RNAi knockdown, bisulfite pyrosequencing of p21 promoter\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods in single lab: biochemical citrullination assay, co-IP, pulse-chase stability, functional methylation readout\",\n      \"pmids\": [\"24957603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In human epidermal stem cells, Dnmt3a binds active enhancers in an H3K36me3-dependent manner; Dnmt3a associates with p63 to maintain high levels of DNA hydroxymethylation at the center of enhancers in a Tet2-dependent manner, and depletion of Dnmt3a inactivates target enhancers and impairs epidermal stem cell function.\",\n      \"method\": \"ChIP-seq, genome-wide methylation profiling, siRNA depletion with functional stem cell assays\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal ChIP, genome-wide profiling, functional KD phenotype, multiple orthogonal approaches in single lab\",\n      \"pmids\": [\"27476967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of DNMT3A-DNMT3L-DNA complex at 2.65 Å shows two DNMT3A monomers simultaneously attacking two CpG dinucleotides separated by 14 bp; Arg836 of the target recognition domain (TRD) makes crucial contacts with CpG to ensure CpG specificity; haematological cancer-associated somatic mutations of substrate-binding residues decrease DNMT3A activity and induce CpG hypomethylation.\",\n      \"method\": \"X-ray crystallography (2.65 Å), in vitro methylation assays, mutagenesis, cellular transformation assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional mutagenesis and in vitro activity assays; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"29414941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The R882H DNMT3A mutation reduces overall DNA methylation activity ~40% but does not change DNA binding affinity, protein stability, or subnuclear distribution; instead, R882 mediates indirect readout of flanking sequence preferences, and R882H causes pronounced changes in flanking sequence preference with site-specific activity changes (up to 7-fold reduction at disfavored sequences).\",\n      \"method\": \"Biochemical methylation assays with purified protein, kinetic analyses with designed substrates, subnuclear localization\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified mutant protein, kinetic analyses, multiple substrate contexts tested\",\n      \"pmids\": [\"29518238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MeCP2 directly interacts with DNMT3A through MeCP2's transcriptional repression domain and DNMT3A's ADD domain, strongly inhibiting DNMT3A activity in vitro by stabilizing the closed autoinhibitory conformation of DNMT3A; binding of unmodified H3 N-terminal tail to the ADD domain relieves MeCP2-mediated inhibition.\",\n      \"method\": \"In vitro binding and methylation assays, conformationally-locked DNMT3A variants as biochemical tools, cell overexpression with global methylation measurement\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution, conformationally-locked engineered variants, domain-mapping, cellular functional validation\",\n      \"pmids\": [\"30102379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NSD1-mediated H3K36me2 is required for recruitment of DNMT3A to intergenic regions; genetic ablation of Nsd1/Nsd2 redistributes DNMT3A to H3K36me3-modified gene bodies and reduces intergenic DNA methylation. The PWWP domain of DNMT3A shows dual recognition of H3K36me2 and H3K36me3, with higher binding affinity toward H3K36me2, abrogated by TBRS-derived missense mutations.\",\n      \"method\": \"Genome-wide DNMT3A ChIP-seq, bisulfite sequencing, genetic Nsd1/Nsd2 ablation, in vitro histone peptide binding assays with PWWP domain\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide profiling with genetic perturbation, in vitro domain binding assays, validated in multiple cell types and patient samples\",\n      \"pmids\": [\"31485078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mutation of the PWWP domain (D329A) in DNMT3A in vivo causes redistribution of DNMT3A activity from H3K36me3-marked gene bodies to H3K27me3-marked and bivalent chromatin domains, resulting in progressive DNA hypermethylation at developmental regulatory gene loci and their de-repression in adult hypothalamus.\",\n      \"method\": \"Mouse knock-in model, whole-genome bisulfite sequencing, non-CpG methylation profiling as marker of de novo activity\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model with genome-wide bisulfite sequencing and multiple molecular readouts\",\n      \"pmids\": [\"31015495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DNMT3A knockout alone perturbs regional (not global) mitochondrial DNA methylation patterns, predominantly at L-strand non-CpG sites at gene-gene boundaries; overexpression of DNMT3A increases mtDNA methylation and strand bias; mtDNA methylation at gene bodies and boundaries negatively correlates with mitochondrial transcript abundance.\",\n      \"method\": \"Bisulfite sequencing with strand-specific mapping, MeDIP, FspEI digestion, HPLC-MS, DNMT3A knockout and overexpression\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (bisulfite, MeDIP, enzymatic digestion, mass spec), single lab\",\n      \"pmids\": [\"31537639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structure of DNMT3A2-DNMT3B3-nucleosome complex shows the catalytic-like domain of accessory DNMT3B3 binds to the acidic patch of the nucleosome core, orienting DNMT3A2 binding to linker DNA; steric constraints suggest nucleosomal DNA must be repositioned for de novo methylation to occur.\",\n      \"method\": \"Cryo-electron microscopy structure determination\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure of ternary complex providing direct mechanistic insight into nucleosome engagement\",\n      \"pmids\": [\"32968275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Structural characterization of wild-type and R882H-mutated DNMT3A bound to DNA substrates shows: the TRD loop recognizes CpG in a +1 flanking site-dependent manner; R882H reduces DNA binding at the homodimeric interface and weakens the molecular link between homodimeric interface and TRD loop, enhancing TRD loop dynamics and compromising enzymatic activity, CpG specificity, and flanking sequence preference.\",\n      \"method\": \"X-ray crystallography, in vitro methylation assays with multiple DNA substrates\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures of both WT and mutant complexed with DNA, supported by in vitro biochemical validation\",\n      \"pmids\": [\"32385248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DNMT3A methylates the Dusp4 promoter using S-adenosylmethionine derived from apoptotic cell-derived methionine during macrophage efferocytosis, repressing Dusp4 expression and enabling sustained ERK phosphorylation required for the prostaglandin E2-TGFβ1 pro-resolving pathway; bone-marrow DNMT3A deletion blocks this resolution cascade.\",\n      \"method\": \"Conditional bone-marrow DNMT3A knockout mice, bisulfite sequencing, metabolic tracing, in vitro efferocytosis assays\",\n      \"journal\": \"Nature metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined molecular mechanism, bisulfite sequencing of target locus, metabolic tracing in single rigorous study\",\n      \"pmids\": [\"35361955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DNMT3A methylates MAP1LC3 gene loci upon autophagy stimulation, causing long-term transcriptional repression of MAP1LC3 isoforms (key autophagy components), providing an epigenetic memory of prior autophagy induction.\",\n      \"method\": \"DNA methylation assays, ChIP, siRNA knockdown, in vivo mouse/zebrafish models\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and bisulfite sequencing at specific loci, in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"32876528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DNMT3A preferentially methylates CpG and non-CpG sites with a 3'-pyrimidine flanking preference (sequence preference for TNC[G/A]CC context); this inherent enzymatic sequence preference directly shapes the genomic DNA methylation landscape as shown by reintroduction into triple-knockout cells.\",\n      \"method\": \"In vitro methylation of randomized DNA sequences followed by deep bisulfite sequencing; validation using triple-knockout cell reintroduction experiments\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic in vitro biochemical assay with deep sequencing readout, validated by orthogonal cellular experiment\",\n      \"pmids\": [\"32543182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DNMT3A inactivation in macrophages amplifies heparin-binding EGF-like growth factor (HB-EGF) release, which paracrinally activates cardiac fibroblasts and increases cardiac fibrosis, identifying a mechanism linking DNMT3A CHIP mutations to heart failure progression.\",\n      \"method\": \"DNMT3A KO in macrophages, co-culture with fibroblasts, conditioned medium experiments, transcriptomic profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway identified through KO with specific secreted factor identification, single lab\",\n      \"pmids\": [\"38242884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DNMT3A deletion in CAR T cells prevents exhaustion by blocking epigenetic silencing of genes (including CD28, CCR7, TCF7, LEF1) that maintain T cell multipotency; genome-wide DNA methylation profiling defined the atlas of DNMT3A-targeted epigenetically silenced genes during exhaustion.\",\n      \"method\": \"CRISPR KO of DNMT3A in CAR T cells, genome-wide bisulfite sequencing, in vitro and in vivo tumor challenge assays\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide methylation profiling with functional KO and in vivo validation, multiple orthogonal approaches\",\n      \"pmids\": [\"34788079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DNMT3A coordinates mRNA splicing by recruiting the core spliceosome protein SF3B1 to RNA polymerase and mRNA in response to differentiation stimuli; this function is independent of DNMT3A's DNA methyltransferase catalytic activity and is required for stem cell exit from the stem state.\",\n      \"method\": \"Co-IP of DNMT3A with SF3B1 and RNA polymerase, loss-of-function experiments, RNA-seq splicing analysis, catalytic-dead mutant rescue experiments\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP demonstrating protein-protein interaction, catalytic-dead mutant establishing independence from methyltransferase activity, functional phenotype in stem cells\",\n      \"pmids\": [\"37024683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DNMT3A interacts with spliceosome component SF3B1 and RNA Polymerase to influence mRNA processing, with the DNA methylation function of DNMT3A not required for this splicing role; loss of DNMT3A impairs splicing efficiency during stem cell activation.\",\n      \"method\": \"Co-IP, splicing efficiency analysis by RNA-seq, catalytic mutant experiments\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, complementary catalytic-mutant rescue, genome-wide RNA-seq splicing analysis\",\n      \"pmids\": [\"37024683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of DNMT3A1's UDR fragment complexed with H2AK119ub1-modified nucleosome shows DNMT3A1 contacts the H2A-H2B acidic patch, a surface groove formed by H2A and H3, nucleosomal DNA, and H2AK119ub1; DNMT3A1 UDR competes with JARID2 (a PRC2 cofactor) for nucleosome binding.\",\n      \"method\": \"Cryo-EM structure determination, biochemical competition assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure with biochemical competition assay validation, single lab\",\n      \"pmids\": [\"39043678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Base editor scanning of DNMT3A in situ identified mutations throughout the protein that perturb function; mutations at an interdomain interface block allosteric activation; mutations in the PWWP domain modulate enzyme activity through altered PWWP domain DNA affinity (a noncanonical function) rather than altered histone recognition or protein stability.\",\n      \"method\": \"Base editor scanning with DNA methylation reporter, in vitro histone binding assays, protein stability measurements\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — systematic in situ mutational scanning with functional readout, orthogonal in vitro validation of mechanism, single lab\",\n      \"pmids\": [\"36266353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DNMT3A R836 and N838 residues mediate CpG guanine recognition and flanking sequence readout: R836 changes conformation depending on flanking sequence, contacting either CpG guanine or the +1/+2 flank and coupling CpG recognition to flanking sequence preference; L883 reduces DNMT3A activity by mediating DNMT3A-specific DNA interactions of the RD loop.\",\n      \"method\": \"In vitro methylation assays with randomized sequence contexts, structure-guided mutagenesis, kinetic analyses\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with structure-guided mutagenesis, quantitative kinetic analyses, multiple variant comparisons\",\n      \"pmids\": [\"36067881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CEBPA interacts specifically with the long splice isoform DNMT3A (but not DNMT3A2), blocking DNMT3A access to DNA substrate and inhibiting its methyltransferase activity; AML-associated CEBPA mutations (e.g., CEBPAN321D) disrupt this interaction and cause aberrant DNA hypermethylation of PRC2 target genes.\",\n      \"method\": \"Co-IP, in vitro methylation inhibition assay, bisulfite sequencing of target loci, isoform-specific interaction mapping\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biochemical inhibition assay, co-IP, isoform specificity mapping, cellular methylation profiling, single rigorous study\",\n      \"pmids\": [\"35080973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"H3K36me3 directly stimulates linker DNA methylation by DNMT3A in a manner independent of the DNMT3A PWWP domain, likely by preventing H3-tail interaction with linker DNA; H3K4me3 absence promotes linker DNA methylation by enabling H3-tail binding to the ADD domain and relieving autoinhibition.\",\n      \"method\": \"In vitro methylation of recombinant mononucleosomes containing defined histone modifications, DNMT3A and domain mutant comparisons\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined modified mononucleosomes and domain mutants, mechanistically informative\",\n      \"pmids\": [\"35236925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Arsenic atoms directly bind to the cysteine-rich ADD domain of DNMT3A, triggering ubiquitin- and proteasome-mediated DNMT3A degradation and genome-wide DNA hypomethylation in embryonic fibroblasts.\",\n      \"method\": \"Direct binding assay (arsenic to ADD domain), proteasome inhibitor rescue, ubiquitination assay, genome-wide bisulfite sequencing\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding demonstrated with domain construct, degradation pathway validated pharmacologically, single lab\",\n      \"pmids\": [\"35373418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"H3.3G34R mutation severely decreases H3K36me2 on the mutant H3.3 tail, impairing recruitment of DNMT3A and its redistribution on chromatin, leading to loss of non-CG methylation at neuronal genes and ectopic CG methylation, causing neuroinflammation and neurodegeneration.\",\n      \"method\": \"H3.3G34R/V/W knock-in mice, genome-wide chromatin profiling, DNMT3A ChIP, bisulfite sequencing for CG and CH methylation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knock-in mouse model, genome-wide profiling of DNMT3A chromatin redistribution, multiple orthogonal readouts\",\n      \"pmids\": [\"36931244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNMT3A R882H/C hotspot mutations enhance intermolecular contacts leading to DNMT3A polymerization (oligomerization); this aberrant oligomerization has a dominant-negative effect by reducing substrate access; introducing DNMT3B-converting mutations inhibits R882H/R882C-triggered polymerization and eliminates the dominant-negative effect.\",\n      \"method\": \"X-ray crystallography, biochemical oligomerization assays, cellular and genomic DNA methylation analyses with engineered mutations\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures with biochemical and cellular validation, mechanistic mutagenesis rescue experiments, single rigorous study\",\n      \"pmids\": [\"38600075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Dnmt3aR878H/+ mutant HSPCs have increased mitochondrial respiration and elevated mitochondrial membrane potential (Δψm) compared to wild-type; this metabolic reprogramming underlies their competitive advantage and can be selectively targeted by long-chain alkyl-TPP molecules (MitoQ, d-TPP) that accumulate in mitochondria of high-Δψm cells, causing apoptosis and ablating the selective advantage.\",\n      \"method\": \"Murine Dnmt3aR878H/+ model, oxidative phosphorylation functional assays, mitochondrial membrane potential measurement, in vivo MitoQ treatment with competitive transplantation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional metabolic assays, in vivo competitive transplantation, pharmacological intervention with mechanistic readout, multiple orthogonal approaches\",\n      \"pmids\": [\"40240771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Dnmt3aR878H/+ HSPCs have increased mitochondrial respiration compared to wild-type; metformin reduces their competitive advantage by enhancing methylation potential and reversing aberrant CpG DNA methylation and H3K27me3 profiles in mutant HSPCs.\",\n      \"method\": \"Murine competitive transplantation, multi-omics (DNA methylation, histone modification, metabolomics), metformin treatment, prime-edited human DNMT3AR882H HSPCs\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multi-omics with genetic and pharmacological validation, replicated in human prime-edited HSPCs\",\n      \"pmids\": [\"40240595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"STAT4 establishes H3K4 methylation and Jmjd3 recruitment at target loci, reducing H3K27me3 and displacing DNMT3A; DNMT3A has an obligate role in repressing Th1 gene expression, and loss of both STAT4 and DNMT3A in T cells recovers Th1 gene expression sufficient to increase IFN-γ production.\",\n      \"method\": \"ChIP for DNMT3A at target loci, conditional Dnmt3a knockout mice, IFN-γ production assays, double-KO epistasis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating DNMT3A occupancy at Th1 gene loci, functional epistasis with STAT4, single lab\",\n      \"pmids\": [\"23772023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"YAP/TAZ interact with and recruit DNMT3A to the CDH1 promoter CpG island, generating promoter hypermethylation that silences CDH1 (E-cadherin) and promotes epithelial-to-mesenchymal transition and gallbladder cancer metastasis; this metastasis-promoting effect depends on DNMT3A's DNA methyltransferase activity.\",\n      \"method\": \"Co-IP of DNMT3A with YAP/TAZ, ChIP at CDH1 promoter, methylation-specific PCR/bisulfite sequencing, methyltransferase-dead mutant rescue experiments\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ChIP demonstrating recruitment, catalytic mutant establishing enzymatic requirement, bisulfite sequencing of target locus\",\n      \"pmids\": [\"38380551\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNMT3A is a de novo DNA methyltransferase whose PWWP domain dually recognizes H3K36me2/me3 for chromatin targeting (with higher affinity for H3K36me2 at intergenic regions), whose ADD domain senses the unmodified H3 tail to relieve autoinhibition, and whose catalytic domain methylates CpG dinucleotides with flanking sequence preferences determined by flexible TRD and RD loop interactions; it forms heterotetramers with DNMT3L that stimulate activity and redirect localization, and the AML hotspot R882H/C mutations promote aberrant polymerization causing dominant-negative hypomethylation; beyond DNA methylation, DNMT3A also coordinates pre-mRNA splicing via SF3B1 recruitment in a methylation-independent manner, is stabilized by PADI4-mediated citrullination, is inhibited by MeCP2 binding to the ADD domain, and is recruited to specific loci by transcription factors including YAP/TAZ and inhibited by CEBPA.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNMT3A is a de novo DNA methyltransferase that establishes genome-wide CpG methylation patterns during embryogenesis and gametogenesis, acting upstream of and functionally cooperating with the maintenance enzyme DNMT1 [#0, #1]. Catalysis proceeds through a target recognition domain in which Arg836/Asn838 contact the CpG guanine and couple base recognition to a 3'-pyrimidine flanking-sequence preference, while the RD loop (L883) tunes DNMT3A-specific DNA contacts; this intrinsic sequence preference shapes the cellular methylation landscape [#16, #23, #6]. Chromatin targeting is governed by the PWWP domain, which reads H3K36me2/me3 with higher affinity for the NSD1-deposited intergenic H3K36me2 mark, while the ADD domain senses the unmodified H3 tail to relieve an autoinhibitory closed conformation, and H3K36me3 further stimulates linker-DNA methylation independently of the PWWP domain by displacing the H3 tail [#9, #25]. Engagement of nucleosomes is direct: DNMT3A contacts the H2A-H2B acidic patch and the H2AK119ub1 mark, with accessory subunits orienting catalysis on linker DNA [#12, #21]. Activity is modulated by multiple partners—DNMT3L heterotetramers stimulate and redistribute the enzyme [#2], PADI4 citrullination stabilizes it and boosts activity [#4], MeCP2 binds the ADD domain to lock the autoinhibitory state [#8], and CEBPA and arsenic respectively block substrate access and trigger degradation [#24, #26]—while transcription factors such as p63 and YAP/TAZ recruit it to specific loci [#5, #32]. Beyond methylation, DNMT3A coordinates pre-mRNA splicing by recruiting SF3B1 and RNA polymerase in a catalysis-independent manner required for stem-cell state exit [#19, #20]. Germline DNMT3A mutations cause Tatton-Brown-Rahman overgrowth syndrome by disrupting domain-domain interactions and histone binding [#3], and the AML/clonal-hematopoiesis hotspot R882H/C mutations impair flanking-sequence readout and drive aberrant polymerization that exerts a dominant-negative reduction of methylation [#7, #13, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that DNMT3A is the enzyme responsible for setting up de novo methylation rather than maintaining it, defining its developmental role.\",\n      \"evidence\": \"Gene targeting/knockout in mouse ES cells and embryos with bisulfite sequencing\",\n      \"pmids\": [\"10555141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how DNMT3A is targeted to specific loci\", \"Mechanism of cooperation with maintenance machinery undefined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed DNMT3A and DNMT1 cooperate through sequential activity, with de novo methylation priming maintenance methylation without physical contact.\",\n      \"evidence\": \"In vitro methylation assays with purified enzymes, sequential vs simultaneous incubation\",\n      \"pmids\": [\"12383256\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular relevance of in vitro stimulation not established\", \"No structural basis provided\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined DNMT3A/DNMT3L heterotetramers as a regulatory module that stimulates activity and redistributes the enzyme from heterochromatic filaments toward euchromatin.\",\n      \"evidence\": \"Biochemical reconstitution, structural and cellular localization analysis (review/synthesis)\",\n      \"pmids\": [\"23663978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Synthesis paper rather than single primary discovery\", \"Physiological role of filament formation in vivo unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed DNMT3A in T-cell lineage control by showing it represses Th1 genes antagonistically to STAT4-driven chromatin remodeling.\",\n      \"evidence\": \"DNMT3A ChIP at target loci, conditional knockout, double-KO epistasis with IFN-\\u03b3 assays\",\n      \"pmids\": [\"23772023\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Recruitment mechanism to Th1 loci not defined\", \"Single lab, no structural data\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked DNMT3A to human overgrowth disease (Tatton-Brown-Rahman syndrome) and implicated PWWP/ADD/catalytic domain interactions in pathogenesis.\",\n      \"evidence\": \"Exome sequencing of patient cohort with protein structural modeling\",\n      \"pmids\": [\"24614070\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct biochemical reconstitution of mutant activity\", \"Functional consequence inferred from modeling\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified PADI4 citrullination as a post-translational mechanism stabilizing DNMT3A and enhancing its methyltransferase activity.\",\n      \"evidence\": \"Co-IP, in vitro citrullination assay, pulse-chase stability, bisulfite pyrosequencing\",\n      \"pmids\": [\"24957603\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Citrullinated residues' structural effect not resolved\", \"Genome-wide impact untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated locus-specific recruitment via transcription factor partnership, with p63 directing DNMT3A to active enhancers to maintain epidermal stem cell function.\",\n      \"evidence\": \"ChIP-seq, genome-wide methylation profiling, siRNA depletion with stem cell assays\",\n      \"pmids\": [\"27476967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling DNMT3A binding to hydroxymethylation maintenance incomplete\", \"Direct p63-DNMT3A contact not structurally mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided the catalytic mechanism: a structure of DNMT3A-DNMT3L-DNA revealing dual CpG attack and the Arg836-mediated basis of CpG specificity, with cancer mutations causing hypomethylation.\",\n      \"evidence\": \"X-ray crystallography at 2.65 \\u00c5, in vitro methylation, mutagenesis, transformation assay\",\n      \"pmids\": [\"29414941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nucleosomal substrate engagement not captured\", \"Flanking-sequence dependence not fully resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the R882H AML mutation mechanism as altered flanking-sequence preference rather than loss of DNA binding or stability.\",\n      \"evidence\": \"Biochemical methylation and kinetic assays with purified mutant protein, subnuclear localization\",\n      \"pmids\": [\"29518238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain dominant-negative behavior structurally\", \"In vivo consequence of altered preference untested here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established MeCP2 as a direct inhibitor that locks DNMT3A in its autoinhibited conformation via the ADD domain, relieved by unmodified H3 tail binding.\",\n      \"evidence\": \"In vitro binding/methylation assays, conformationally-locked DNMT3A variants, cellular methylation\",\n      \"pmids\": [\"30102379\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genomic loci affected by MeCP2 inhibition not mapped\", \"Physiological contexts of regulation unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified NSD1-deposited H3K36me2 as the recruitment signal directing DNMT3A to intergenic regions, with the PWWP domain showing dual H3K36me2/me3 recognition.\",\n      \"evidence\": \"Genome-wide ChIP-seq, bisulfite sequencing, Nsd1/Nsd2 ablation, PWWP peptide binding assays\",\n      \"pmids\": [\"31485078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of me2 vs me3 in vivo not fully partitioned\", \"Connection to disease mutations only inferred\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed in vivo that PWWP-domain integrity restrains DNMT3A from Polycomb/bivalent chromatin, preventing aberrant hypermethylation and gene de-repression.\",\n      \"evidence\": \"Mouse D329A knock-in, whole-genome and non-CpG bisulfite sequencing\",\n      \"pmids\": [\"31015495\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality across tissues beyond hypothalamus untested\", \"Link to human TBRS phenotypes indirect\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended DNMT3A function to mitochondrial DNA, where it shapes regional, strand-biased methylation correlating with transcript abundance.\",\n      \"evidence\": \"Strand-specific bisulfite sequencing, MeDIP, FspEI digestion, HPLC-MS, KO and overexpression\",\n      \"pmids\": [\"31537639\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of mitochondrial import/targeting unknown\", \"Functional consequence of mtDNA methylation not causally tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved nucleosome engagement: cryo-EM of a DNMT3A2-DNMT3B3-nucleosome complex showed accessory-domain anchoring to the acidic patch orients catalysis on linker DNA.\",\n      \"evidence\": \"Cryo-EM structure determination\",\n      \"pmids\": [\"32968275\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational change repositioning nucleosomal DNA not directly observed\", \"Catalytically engaged state not captured\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved how R882H structurally compromises catalysis—weakening the dimer-interface-to-TRD-loop coupling and increasing loop dynamics.\",\n      \"evidence\": \"X-ray crystallography of WT and mutant with DNA, in vitro methylation\",\n      \"pmids\": [\"32385248\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dominant-negative polymerization not yet explained\", \"Cellular consequence not measured here\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined the intrinsic catalytic sequence preference (3'-pyrimidine, TNC[G/A]CC) that directly patterns the genomic methylome.\",\n      \"evidence\": \"In vitro methylation of randomized DNA with deep bisulfite sequencing, triple-KO reintroduction\",\n      \"pmids\": [\"32543182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay of intrinsic preference with chromatin targeting in vivo not separated\", \"Non-CpG preference physiological role untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Connected DNMT3A to inflammation resolution: it methylates Dusp4 using apoptotic-cell-derived methionine during efferocytosis to sustain pro-resolving signaling.\",\n      \"evidence\": \"Conditional bone-marrow KO mice, bisulfite sequencing, metabolic tracing, efferocytosis assays\",\n      \"pmids\": [\"35361955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Targeting mechanism to Dusp4 promoter not defined\", \"Generalizability beyond macrophages untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed an epigenetic-memory role: DNMT3A methylates MAP1LC3 loci to durably repress autophagy genes after autophagy induction.\",\n      \"evidence\": \"DNA methylation assays, ChIP, siRNA knockdown, mouse/zebrafish models\",\n      \"pmids\": [\"32876528\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Recruitment trigger to MAP1LC3 loci unclear\", \"Single lab, locus-specific evidence\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed DNMT3A loss in CAR T cells prevents exhaustion by blocking methylation-driven silencing of multipotency genes, defining a therapeutic methylation atlas.\",\n      \"evidence\": \"CRISPR KO in CAR T cells, genome-wide bisulfite sequencing, in vivo tumor challenge\",\n      \"pmids\": [\"34788079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism of exhaustion-gene targeting incomplete\", \"Long-term safety of DNMT3A loss not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked clonal-hematopoiesis DNMT3A loss to cardiac fibrosis via amplified HB-EGF release activating fibroblasts.\",\n      \"evidence\": \"Macrophage KO, fibroblast co-culture, conditioned medium, transcriptomics\",\n      \"pmids\": [\"38242884\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Methylation target controlling HB-EGF not pinpointed\", \"Single lab mechanistic chain\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Uncovered a methylation-independent function: DNMT3A recruits SF3B1 and RNA polymerase to coordinate splicing required for stem-cell state exit.\",\n      \"evidence\": \"Reciprocal co-IP, catalytic-dead mutant rescue, RNA-seq splicing analysis\",\n      \"pmids\": [\"37024683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of SF3B1 interaction unknown\", \"Which transcripts depend on this function in vivo unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mapped nucleosome recognition via H2AK119ub1: DNMT3A1 UDR contacts the acidic patch and ubiquitin mark, competing with the PRC2 cofactor JARID2.\",\n      \"evidence\": \"Cryo-EM structure, biochemical competition assays\",\n      \"pmids\": [\"39043678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional outcome of PRC2 competition in vivo untested\", \"Isoform-specific UDR role not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Systematic mutational scanning identified an interdomain interface controlling allosteric activation and a noncanonical PWWP-DNA-affinity function distinct from histone reading.\",\n      \"evidence\": \"Base editor scanning with methylation reporter, in vitro histone binding, stability assays\",\n      \"pmids\": [\"36266353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural detail of interdomain allostery not solved\", \"Disease relevance of identified variants partly untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Dissected CpG-guanine recognition and flanking readout at residue level (R836 conformational switching, N838, L883).\",\n      \"evidence\": \"In vitro methylation with randomized contexts, structure-guided mutagenesis, kinetics\",\n      \"pmids\": [\"36067881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coupling to chromatin context not addressed\", \"Effect of disease mutations on these residues only inferred\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified isoform-specific inhibition: CEBPA blocks long-isoform DNMT3A substrate access, and AML CEBPA mutations relieve this to cause PRC2-target hypermethylation.\",\n      \"evidence\": \"Co-IP, in vitro inhibition assay, isoform mapping, bisulfite sequencing\",\n      \"pmids\": [\"35080973\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of isoform-selective binding unresolved\", \"In vivo contribution to leukemogenesis not quantified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed H3K36me3 directly stimulates linker-DNA methylation independent of the PWWP domain, while absence of H3K4me3 relieves ADD autoinhibition.\",\n      \"evidence\": \"In vitro methylation of defined modified mononucleosomes with domain mutants\",\n      \"pmids\": [\"35236925\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo separation of these contributions untested\", \"Mechanism by which H3K36me3 displaces H3 tail inferred\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established YAP/TAZ-directed recruitment of DNMT3A to the CDH1 promoter, driving E-cadherin silencing and cancer metastasis in a catalysis-dependent manner.\",\n      \"evidence\": \"Co-IP, ChIP, methylation-specific PCR/bisulfite, methyltransferase-dead rescue\",\n      \"pmids\": [\"38380551\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect YAP/TAZ-DNMT3A contact unclear\", \"Single lab, single cancer context\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified arsenic binding to the ADD domain as a trigger for proteasomal DNMT3A degradation and genome-wide hypomethylation.\",\n      \"evidence\": \"Direct binding assay, proteasome inhibitor rescue, ubiquitination assay, bisulfite sequencing\",\n      \"pmids\": [\"35373418\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase mediating degradation not identified\", \"Single cell-type validation\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated in vivo that loss of substrate H3K36me2 (H3.3G34R) prevents DNMT3A recruitment, causing CG/CH methylation defects and neurodegeneration.\",\n      \"evidence\": \"H3.3G34R/V/W knock-in mice, chromatin profiling, DNMT3A ChIP, CG/CH bisulfite sequencing\",\n      \"pmids\": [\"36931244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causality between methylation loss and neuroinflammation not fully dissected\", \"Therapeutic reversibility untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Explained the dominant-negative mechanism of R882H/C as enhanced intermolecular polymerization that occludes substrate, reversible by DNMT3B-converting mutations.\",\n      \"evidence\": \"X-ray crystallography, oligomerization assays, cellular/genomic methylation with engineered mutants\",\n      \"pmids\": [\"38600075\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo polymerization dynamics not visualized\", \"Therapeutic targeting of polymerization untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a metabolic vulnerability of R882H-equivalent mutant HSPCs—elevated mitochondrial respiration and membrane potential—targetable pharmacologically.\",\n      \"evidence\": \"Murine Dnmt3aR878H/+ model, OXPHOS assays, membrane potential, in vivo MitoQ/metformin treatment, prime-edited human HSPCs\",\n      \"pmids\": [\"40240771\", \"40240595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal link between methylation defect and metabolic shift incompletely defined\", \"Clinical translation of pharmacological targeting untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DNMT3A's intrinsic sequence preference, chromatin reader domains, transcription-factor recruitment, post-translational modifications, and methylation-independent splicing role are integrated into a single locus-selection logic in vivo remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified model linking targeting inputs to genome-wide outcome\", \"Structural basis of methylation-independent SF3B1/RNA Pol interaction unknown\", \"Mechanism partitioning nuclear vs mitochondrial DNMT3A undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [0, 6, 16, 23]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [6, 16, 22]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [9, 25, 21]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 16, 14]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [19, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 7, 10]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [9, 12, 21]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [9, 10, 21, 25]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 24, 31, 32]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [19, 20]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 6, 28, 30]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [18, 31, 14]}\n    ],\n    \"complexes\": [\n      \"DNMT3A-DNMT3L heterotetramer\",\n      \"DNMT3A2-DNMT3B3-nucleosome complex\"\n    ],\n    \"partners\": [\n      \"DNMT3L\",\n      \"DNMT1\",\n      \"MeCP2\",\n      \"SF3B1\",\n      \"CEBPA\",\n      \"PADI4\",\n      \"YAP1\",\n      \"TP63\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}