{"gene":"ASH2L","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2011,"finding":"Crystal structure of the N-terminal domain of ASH2L reveals an atypical PHD finger (without histone tail-binding activity) and a winged-helix (WH) motif that directly binds DNA. DNA-binding-deficient mutants reduced ASH2L localization to the HOX locus, and a single K131A mutation in the WH domain broke chromatin domain boundary, implicating ASH2L in chromosome demarcation.","method":"X-ray crystallography, mutagenesis, ChIP","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and ChIP functional validation in a single rigorous study","pmids":["21660059"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of ASH2L reveals a forkhead-like helix-wing-helix (HWH) domain that binds DNA. In vivo, the HWH domain is required for binding to the β-globin locus control region, H3K4 trimethylation, and maximal β-globin gene expression.","method":"X-ray crystallography, mutagenesis, ChIP, gene expression analysis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with in vivo functional validation by mutagenesis and ChIP","pmids":["21642971"],"is_preprint":false},{"year":2013,"finding":"ASH2L, via its N-terminal winged-helix (WH) motif (specifically K99), is essential for H2B ubiquitylation (H2Bub)-dependent H3K4 methylation by the MLL complex. Crosstalk between H2Bub and H3K4 methylation can occur in trans (ubiquitin does not need to be on nucleosomes or histones), and promotes MLL activity for all three methylation states. MLL3 does not respond to H2Bub, indicating regulatory specificity among MLL family members.","method":"In vitro methyltransferase assay, mutagenesis (K99 deletion/mutation), biochemical reconstitution","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with site-directed mutagenesis and multiple orthogonal assays","pmids":["23453805"],"is_preprint":false},{"year":2014,"finding":"A non-active-site surface of the MLL1 SET domain (termed the Kabuki interaction surface, KIS) is required for interaction with the RbBP5/Ash2L heterodimer. Mutations at this surface (modeled on Kabuki syndrome MLL2 mutations) abolish H3K4 dimethylation by the MLL1 core complex and disrupt MLL1–WRAD or MLL1–RbBP5/Ash2L interaction, implicating Ash2L in forming a second active site within SET1 family core complexes.","method":"Mutagenesis, in vitro methyltransferase assay, co-immunoprecipitation","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and binding assays; single lab but multiple orthogonal methods","pmids":["24680668"],"is_preprint":false},{"year":2018,"finding":"Structural and genome-wide studies reveal that an extensive interaction network at the Dpy-30/Ash2L interface is critical for correct genome-wide placement of H3K4me2 and H3K4me3 but only modestly contributes to in vitro KMT2 methyltransferase activity. H3K4me2 peaks persisting after Dpy-30 loss occur in highly transcribed regions, indicating interplay between COMPASS kinetics and RNA polymerase cycling.","method":"Structural analysis, genome-wide ChIP-seq, in vitro methyltransferase assays","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structural analysis combined with genome-wide and biochemical data; multiple orthogonal methods","pmids":["30270175"],"is_preprint":false},{"year":2022,"finding":"DPY30 functions as an ASH2L-specific stabilizer: it increases ASH2L stability and enhances ASH2L-mediated interactions, promoting compaction and stabilization of the MLL1 complex to increase its HKMT activity. DPY30-stabilized ASH2L acquires additional interfaces with H3 and nucleosomal DNA, boosting MLL1 complex methyltransferase activity on nucleosomes.","method":"Biochemical reconstitution, in vitro methyltransferase assay, structural/biochemical analysis","journal":"iScience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical reconstitution with multiple substrate assays; single lab but multiple orthogonal methods","pmids":["36065180"],"is_preprint":false},{"year":2011,"finding":"PRMT1 (and PRMT5) methylate Ash2L on Arg-296 both in vitro and in cells, representing the first post-translational modification identified on Ash2L and demonstrating cross-talk between chromatin-modifying enzyme complexes.","method":"In vitro methylation assay, mass spectrometry, mutagenesis, cell-based assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay combined with cell-based validation and site identification; single lab, two orthogonal methods","pmids":["21285357"],"is_preprint":false},{"year":2007,"finding":"Ash2L-containing methyltransferase complexes are recruited to specific muscle-specific gene promoters during differentiation, directed by the transcriptional regulator Mef2d. p38 MAPK signaling phosphorylates Mef2d to modulate this interaction, resulting in H3K4me3 at target promoters and epigenetic marking for gene expression.","method":"ChIP, co-immunoprecipitation, signaling pathway analysis (p38 MAPK inhibition/activation)","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and ChIP with pharmacological and genetic epistasis in differentiation context; multiple orthogonal methods","pmids":["18026121"],"is_preprint":false},{"year":2010,"finding":"Ash2L physically interacts with Tbx1 in both yeast two-hybrid and mammalian co-immunoprecipitation assays, acts as a transcriptional co-activator in luciferase reporter assays, and overlapping expression patterns exist during development. Ash2l-null embryos die early in gestation, demonstrating Ash2l is essential for early embryogenesis.","method":"Yeast two-hybrid, co-immunoprecipitation, luciferase reporter assay, gene-trap knockout mouse","journal":"Experimental biology and medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid and co-IP interaction with functional reporter assay and KO phenotype; single lab","pmids":["20463296"],"is_preprint":false},{"year":2008,"finding":"Ap2delta physically interacts exclusively with Ash2l (identified by yeast two-hybrid), and this interaction mediates Ap2delta transactivation. Ap2delta associates with endogenous ASH2L and MLL2 (ALR) in a complex that methylates H3K4. Ap2delta recruits Ash2l and ALR to the Hoxc8 locus, leading to H3K4me3 and gene activation.","method":"Yeast two-hybrid, co-immunoprecipitation, ChIP, luciferase reporter assay","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus Co-IP plus ChIP; single lab, multiple methods","pmids":["18495928"],"is_preprint":false},{"year":2011,"finding":"NF-Y acts upstream of H3K4me3 deposition by specifically recruiting Ash2L to CCAAT-containing promoters. Knockdown of NF-Y subunits prevents promoter association of Ash2L (but not MLL1 or WDR5), causing a dramatic drop in H3K4me3. Endogenous NF-Y and Ash2L interact in vivo. Additionally, Ash2L knockdown globally reduces H3K4me3 with concomitant increase in H3K79me2.","method":"ChIP, RNAi knockdown, co-immunoprecipitation, transcriptional profiling","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with RNAi and Co-IP, multiple orthogonal methods; single lab","pmids":["21445285"],"is_preprint":false},{"year":2014,"finding":"ASH2L and MYC interact directly in vitro and co-localize in cells and on chromatin. MYC associates with H3K4 methyltransferase activity dependent on ASH2L. MYC stimulates demethylation and acetylation of H3K27 through association with KMT2 complexes. WDR5, another KMT2 subunit, also binds directly to MYC.","method":"In vitro binding assay, co-immunoprecipitation, ChIP, genome-wide analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro direct binding plus Co-IP and ChIP; single lab, multiple methods","pmids":["24782528"],"is_preprint":false},{"year":2010,"finding":"Ash2L is recruited to the inactive X chromosome (Xi) by Xist RNA concomitantly with Saf-A and macroH2A, characterizing a developmental transition to Xi maintenance. A mutant Xist that does not cause gene repression still triggers Ash2L recruitment and chromosome-wide H4 hypoacetylation, indicating that Ash2L recruitment is mechanistically separable from gene silencing.","method":"Immunofluorescence, RNA FISH, cell fractionation, mutant Xist RNA expression","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by immunofluorescence with functional genetic dissection using mutant Xist; single lab","pmids":["20150277"],"is_preprint":false},{"year":2014,"finding":"ASH2L is recruited to the enhancer of the ERα (ESR1) gene through GATA3, and acts as a co-activator of GATA3 to promote ERα transcription in breast cancer cells. Depletion of ASH2L suppresses ERα expression; forced expression of ASH2L induces it.","method":"Co-immunoprecipitation, ChIP, RNAi knockdown, forced expression assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP plus functional gain/loss-of-function; single lab","pmids":["25258321"],"is_preprint":false},{"year":2014,"finding":"Ash2L is required for P53-dependent apoptosis: upon P53 stabilization, pro-apoptotic target promoters are enriched with H3K4me3 and Wdr5, RbBP5, and Ash2L. Ash2L silencing abrogates P53-induced target gene expression and reduces RNA Pol II Ser5-CTD phosphorylation, TFIIB, and TFIIF (RAP74) occupancy, indicating Ash2L aids formation of a stable transcription pre-initiation complex.","method":"ChIP, RNAi knockdown, gene expression analysis, overexpression assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with multiple PIC components, gain/loss-of-function; single lab","pmids":["25023704"],"is_preprint":false},{"year":2019,"finding":"Ash2l directly binds to super-enhancers of stemness genes (Jarid2, Nanog, Sox2, Oct4) and recruits Oct4/Sox2/Nanog (OSN) to form an Ash2l/OSN complex that drives enhancer activation and pluripotency. The W118A mutation disrupting the Ash2l-Oct4 interaction fails to rescue enhancer activation, validating the direct interaction is required. CRISPRi blocking of Ash2l-binding motifs at super-enhancers prevents OSN recruitment.","method":"ChIP, co-immunoprecipitation, CRISPRi/dCas9, mutagenesis, gene expression analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods including mutagenesis and CRISPRi; single lab","pmids":["31555818"],"is_preprint":false},{"year":2019,"finding":"Loss of Ash2l in the murine hematopoietic system causes global reduction of H3K4 methylation, deregulated gene expression (including downregulation of mitosis-associated genes), accumulation of LSK cells in G2-phase, and failure of hematopoietic stem/progenitor cell proliferation and differentiation.","method":"Conditional knockout mouse, flow cytometry, gene expression analysis, H3K4 methylation assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined cellular and molecular phenotypes; single lab","pmids":["31164666"],"is_preprint":false},{"year":2019,"finding":"ASH2L loss in neural progenitor cells impairs H3K4me3, reduces Wnt-β-catenin signaling transcriptional machinery, inhibits S-phase entry of NPCs, and causes neocortex malformation with fewer neurons. Overexpressing β-catenin after ASH2L elimination rescues the proliferation deficiency, placing ASH2L upstream of Wnt signaling in neurogenesis.","method":"Conditional knockout mouse, ChIP, gene expression analysis, epistasis by β-catenin rescue","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with genetic epistasis rescue and ChIP; single lab","pmids":["31315048"],"is_preprint":false},{"year":2022,"finding":"Loss of Ash2l in mouse embryo fibroblasts (MEFs) causes global reduction of H3K4me1 and H3K4me3, increased histone H3 loading and reduced chromatin accessibility at CpG island promoters, downregulation of FoxM1-responsive genes, and induction of senescence. Exogenous FOXM1 is sufficient to delay senescence.","method":"Conditional knockout MEFs, ATAC-seq, ChIP-seq, gene expression analysis, FOXM1 rescue experiment","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with multiple genome-wide assays and genetic rescue; single lab","pmids":["35819198"],"is_preprint":false},{"year":2022,"finding":"Loss of Ash2l reduces chromatin accessibility at promoters, increases loading of histone H3, alters activating and repressive histone marks, and alters CTCF binding (lost at promoter-associated sites, gained at intergenic sites), correlating with gene repression.","method":"ATAC-seq, ChIP-seq, conditional knockout MEFs","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide ATAC-seq and ChIP-seq in conditional KO; single lab","pmids":["36513698"],"is_preprint":false},{"year":2022,"finding":"The ASH2L SDI (Sdc1 DPY30 interaction) domain is required for recognition and binding of DPY30. Loss of Ash2l causes DPY30 degradation via the ubiquitin-proteasomal pathway. Three specific amino acids in the SDI domain are essential for DPY30 binding. Overexpression of DPY30 in Ash2l-depleted cells rescues Ccnd1 expression and abnormal cell cycle, indicating DPY30 can act in other complexes independently of ASH2L.","method":"Mouse model, conditional knockout, mutagenesis, proteasome inhibition assay, western blot, ChIP-seq/RNA-seq analysis","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with proteasome pathway analysis and rescue experiment; single lab","pmids":["35563756"],"is_preprint":false},{"year":2009,"finding":"Ap2delta is required for recruitment of Ash2l-containing complexes to the Fgfr3 promoter, and this recruitment leads to H3K4me3 and Fgfr3 transcriptional activation. Ash2l and Ap2delta co-regulate 42 genes identified by genome-wide expression profiling.","method":"ChIP, RNAi knockdown, gene expression profiling (microarray)","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with RNAi functional validation; single lab","pmids":["20046871"],"is_preprint":false},{"year":2019,"finding":"Cell-penetrating peptides derived from ASH2L's DPY30-binding domain specifically inhibit DPY30's interaction with ASH2L and reduce H3K4 methylation in cells, suppressing growth of MLL-rearranged leukemia and MYC-dependent hematologic cancer cells.","method":"Peptide competition assay, cell viability assays, H3K4 methylation assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical competition with functional cellular readout; single lab","pmids":["31251903"],"is_preprint":false},{"year":2018,"finding":"ASH2L-B, a major isoform highly expressed in embryonic stem cells, is directly activated by OCT4 transcription. ASH2L-B is required for somatic cell reprogramming and for H3K4 methylation levels during reprogramming.","method":"ChIP, reporter assay, gene knockdown, reprogramming efficiency assay, western blot","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and loss-of-function with functional reprogramming readout; single lab","pmids":["30269953"],"is_preprint":false},{"year":2020,"finding":"ASH2L associates with ERα and is recruited to cis-regulatory elements of the PAX2 gene, where it modulates H3K4me3 and H3K27me3 levels to enhance ERα-mediated transactivation. Knockdown of ASH2L reduces PAX2 expression and suppresses endometrial cancer cell proliferation and migration.","method":"Co-immunoprecipitation, ChIP, RNAi knockdown, cell proliferation and migration assays","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP with functional KD phenotype; single lab","pmids":["32279431"],"is_preprint":false},{"year":2023,"finding":"ASH2L is essential for meiotic prophase progression but dispensable for mitosis in differentiated spermatogonia. Ash2l deficiency causes global loss of H3K4me3 at promoters, downregulation of genes in H3K9 di-methylation, DNA methylation and piRNA pathways important for transposon repression, leading to meiotic arrest with failures in chromosomal synapsis and ectopic LINE1-ORF1P expression.","method":"Germ cell-specific conditional KO mouse, ChIP-seq, RNA-seq, immunofluorescence","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with ChIP-seq and RNA-seq; single lab","pmids":["39992154"],"is_preprint":false},{"year":2022,"finding":"Dpy-30 and Ash2L associate (by co-immunoprecipitation) with neural plate border transcription factors Msx1 and Tfap2a in Xenopus. ChIP demonstrates Ash2L and H3K4me3 accumulate at the sox10 promoter in a Tfap2a-dependent manner, establishing that Ash2l interacts with specific transcription factors to recruit COMPASS to neural crest gene regulatory regions.","method":"Co-immunoprecipitation, ChIP, morpholino knockdown","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP in Xenopus with loss-of-function; single lab","pmids":["36162552"],"is_preprint":false},{"year":2023,"finding":"ASH2L interacts with SET1/MLL family members (SETD1A, SETD1B, MLL1, MLL2) in glioblastoma cells as determined by mass spectrometry. ASH2L depletion leads to cell cycle arrest, apoptosis, and downregulation of cell cycle regulatory genes (TRA2B, BARD1, KIF20B, ARID4A, SMARCC1) as determined by RNA-seq and CUT&RUN.","method":"CRISPR/Cas9 screen, mass spectrometry, RNA-seq, CUT&RUN, orthotopic in vivo model","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-based interaction mapping with functional CRISPR KO and genomic assays; single lab","pmids":["37974198"],"is_preprint":false},{"year":2023,"finding":"ASH2L-mediated H3K4me3 at the HIPK2 and ADAM17 promoters triggers their transcription, leading to aberrant activation of Notch1 signaling, contributing to fibrosis and inflammation in diabetic nephropathy. Loss of ASH2L in db/db mice reduces glomerular injury.","method":"ChIP, conditional knockout mouse (AAV-shRNA), gene expression analysis","journal":"Translational research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with in vivo KD and functional outcome; single lab","pmids":["37879562"],"is_preprint":false},{"year":2023,"finding":"ASH2L upregulation activates STEAP4 transcription (via H3K4me3) in endothelial cells, elevating copper uptake through CTR1, triggering oxidative stress and inflammatory responses that cause endothelial dysfunction. Endothelial-specific ASH2L knockdown in db/db mice restores endothelium-dependent relaxation.","method":"ChIP, AAV-shRNA knockdown in vivo, cell-based assays, copper transport assays","journal":"Acta pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with in vivo loss-of-function and mechanistic pathway validation; single lab","pmids":["37903897"],"is_preprint":false},{"year":2025,"finding":"In pulmonary arterial smooth muscle cells, ASH2L deficiency promotes SMC proliferation and vascular remodeling independently of canonical H3K4me3-based transcriptional activation. Instead, ASH2L forms a protein complex with KLF5 and FBXW7, accelerating ubiquitin-proteasomal degradation of KLF5. Loss of ASH2L promotes KLF5 recruitment to the NOTCH3 promoter and enhances NOTCH3 expression.","method":"Co-immunoprecipitation, mass spectrometry, ChIP, conditional KO/overexpression mouse, ubiquitin assay","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP plus in vivo models, multiple orthogonal methods; single lab","pmids":["39996311"],"is_preprint":false},{"year":2025,"finding":"AARS1 and HDAC1 mediate lactylation of ASH2L at lysine 312 (K312-lac). ASH2L-K312-lac is enriched in VEGFA genomic regions, facilitates targeted recruitment of the MLL complex, and enhances VEGFA expression through synergistic activation of enhancers and promoters, promoting tumor angiogenesis in HCC.","method":"High-throughput proteomics, ChIP-seq, co-immunoprecipitation, in vivo tumor models","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics-identified PTM with ChIP-seq and Co-IP validation; single lab","pmids":["40726441"],"is_preprint":false},{"year":2019,"finding":"ASH2L promotes ASH2L-mediated H3K4me3 and scavenger receptor (including PPARγ) transcription in endothelial cells, and enhances CD36/TLR4 interaction to activate NF-κB pro-inflammatory signaling. Endothelial-specific Ash2l knockdown reduces atherosclerotic lesion formation in ApoE-/- mice.","method":"ChIP, co-immunoprecipitation, AAV-shRNA in vivo knockdown, cell-based assays","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and Co-IP with in vivo functional validation; single lab","pmids":["38280036"],"is_preprint":false},{"year":2019,"finding":"Glucocorticoid receptor (uGR) and ASH2L interact in a common protein complex in myeloid leukemia cells, with uGR and ASH2L binding to BCL2L1 via chromatin looping to maintain BCL-XL over-expression. Upon dexamethasone treatment, GR and ASH2L recruitment is reduced, BCL-XL expression diminishes, and apoptosis is induced.","method":"Co-immunoprecipitation, ChIP, chromosome conformation assay, gene expression analysis","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, and chromatin looping assay; single lab","pmids":["31870784"],"is_preprint":false},{"year":2014,"finding":"Depletion of WAR subcomplex components (WDR5, ASH2L, RBBP5) leads to increased levels of unspliced FOS transcripts without necessarily affecting mature transcript levels or H3K4me3 at the promoter, revealing a role for ASH2L in coordinating transcription with efficient pre-mRNA processing.","method":"RNAi knockdown, RT-PCR for spliced/unspliced transcripts, ChIP","journal":"Cellular & molecular biology letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, functional RNAi with limited mechanistic follow-up","pmids":["24715476"],"is_preprint":false},{"year":2012,"finding":"RNAi knockdown of Ash2l in embryonic stem cells reduces H3K4 methylation levels and drives cells to a silenced chromatin state with elevated H3K9me3. Genome-wide ChIP-seq shows Ash2l is enriched at genes regulating open chromatin, including chromatin remodeler Chd7, c-Myc, and H3K9 demethylase Kdm4c.","method":"RNAi knockdown, ChIP-seq, western blot for histone modifications","journal":"The Journal of biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, RNAi with genome-wide profiling but limited mechanistic dissection","pmids":["23239880"],"is_preprint":false},{"year":2023,"finding":"ASH2L-mediated H3K4me3 at the Onecut2 (a bivalent locus) promoter maintains its expression in neural stem/progenitor cells. Loss of Ash2l reduces Onecut2 expression; constitutive Onecut2 expression rescues defective NSPC proliferation and differentiation. Onecut2 modulates TGF-β signaling, and TGF-β inhibitor treatment rectifies the Ash2l-deficient NSPC phenotype.","method":"Conditional KO mouse, RNA-seq, ChIP, genetic rescue, pharmacological inhibition","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with genetic and pharmacological epistasis; single lab","pmids":["37433907"],"is_preprint":false}],"current_model":"ASH2L is a core scaffolding and regulatory subunit of the COMPASS/SET1-MLL family of histone H3K4 methyltransferase complexes; it contains an N-terminal winged-helix/forkhead-like HWH domain that directly binds DNA, an atypical PHD finger, and an SDI domain that binds and stabilizes DPY30, and it is itself post-translationally modified by PRMT1/PRMT5 arginine methylation (at R296) and by lactylation (at K312); within the core complex (WRAD: WDR5, RBBP5, ASH2L, DPY30), ASH2L is required for H2B ubiquitylation-dependent trans-stimulation of H3K4 di- and trimethylation through its WH motif (K99), contributes to formation of a second active site on nucleosomes, facilitates DPY30-mediated complex stabilization, and cooperates with sequence-specific transcription factors (Mef2d, Ap2δ, NF-Y, GATA3, OCT4, Tbx1, Tfap2a) and signaling pathways (p38 MAPK) to target H3K4me3 to specific gene loci; it also plays non-canonical roles including forming a complex with KLF5 and FBXW7 to accelerate KLF5 ubiquitin-proteasomal degradation in vascular smooth muscle, enabling stable transcription pre-initiation complex formation at p53 pro-apoptotic targets, and coordinating pre-mRNA processing, while being essential for embryogenesis, hematopoiesis, neurogenesis, and other tissue-specific developmental programs."},"narrative":{"mechanistic_narrative":"ASH2L is a core scaffolding and regulatory subunit of the SET1/MLL (COMPASS-family) histone H3K4 methyltransferase complexes that couples chromatin marking to gene activation across embryogenesis, hematopoiesis, neurogenesis, and meiosis [PMID:31164666, PMID:31315048, PMID:39992154]. Structurally, its N-terminal forkhead-like winged-helix (HWH) domain binds DNA directly and is required for recruitment to target loci such as the HOX and β-globin regions, H3K4 trimethylation, and chromatin domain demarcation [PMID:21660059, PMID:21642971]. Within the WRAD core, ASH2L is essential for H2B-ubiquitylation–dependent trans-stimulation of all three H3K4 methylation states through its WH motif residue K99, and it contributes a non-active-site surface that, with RbBP5, forms a second active site on nucleosomes required for MLL1 dimethylation activity [PMID:23453805, PMID:24680668]. Its SDI domain binds and stabilizes DPY30, which in turn stabilizes ASH2L and reciprocally boosts MLL complex compaction and methyltransferase activity on nucleosomes; disrupting this interface dysregulates genome-wide H3K4me2/me3 placement [PMID:30270175, PMID:36065180, PMID:35563756]. ASH2L does not act constitutively but is targeted to specific loci by sequence-specific transcription factors and signaling inputs—including Mef2d (downstream of p38 MAPK), Ap2δ, NF-Y, GATA3, MYC, OCT4/SOX2/NANOG, and Tfap2a—to deposit activating H3K4me3 at lineage- and stimulus-specific genes [PMID:18026121, PMID:18495928, PMID:21445285, PMID:24782528, PMID:25258321, PMID:31555818, PMID:36162552]. ASH2L is itself post-translationally modified, being arginine-methylated at R296 by PRMT1/PRMT5 and lactylated at K312 by AARS1/HDAC1, the latter directing MLL recruitment to VEGFA for tumor angiogenesis [PMID:21285357, PMID:40726441]. Beyond canonical methyltransferase scaffolding, ASH2L supports stable transcription pre-initiation complex assembly at p53 pro-apoptotic targets [PMID:25023704] and acts non-canonically in vascular smooth muscle by forming a KLF5–FBXW7 complex that accelerates KLF5 ubiquitin-proteasomal degradation independently of H3K4me3 [PMID:39996311].","teleology":[{"year":2011,"claim":"Established the structural basis for how ASH2L engages chromatin directly rather than only as a passive scaffold, by resolving an atypical PHD finger and a DNA-binding winged-helix/HWH domain required for locus targeting and H3K4me3.","evidence":"X-ray crystallography with mutagenesis and ChIP at the HOX and β-globin loci","pmids":["21660059","21642971"],"confidence":"High","gaps":["Sequence determinants of DNA recognition specificity unresolved","Does not establish how DNA binding is integrated with transcription-factor-directed recruitment"]},{"year":2013,"claim":"Showed mechanistically why ASH2L is required for the H2Bub–H3K4 methylation crosstalk, defining the WH motif residue K99 as essential for trans-stimulation of all three methylation states.","evidence":"In vitro reconstituted methyltransferase assays with K99 mutagenesis","pmids":["23453805"],"confidence":"High","gaps":["Molecular sensor that transmits the ubiquitin signal to the active site not defined","Why MLL3 is unresponsive not explained at residue level"]},{"year":2014,"claim":"Defined the ASH2L/RbBP5 heterodimer as forming a second active site on the MLL1 SET domain, explaining a disease-relevant non-active-site interaction surface.","evidence":"Mutagenesis modeled on Kabuki-syndrome mutations with in vitro methyltransferase and Co-IP assays","pmids":["24680668"],"confidence":"High","gaps":["Direct structural visualization of the second active site on nucleosomes not provided","Generality across all SET1/MLL members not tested"]},{"year":2018,"claim":"Reconciled in vitro versus in vivo roles by showing the DPY30/ASH2L interface governs genome-wide H3K4me placement more than bulk catalytic rate, linking COMPASS kinetics to RNA polymerase cycling.","evidence":"Structural analysis combined with genome-wide ChIP-seq and in vitro methyltransferase assays","pmids":["30270175"],"confidence":"High","gaps":["Causal coupling between Pol II elongation and persistent H3K4me2 peaks not demonstrated","Locus-selectivity mechanism unresolved"]},{"year":2022,"claim":"Established a reciprocal stabilization mechanism in which DPY30 binds the ASH2L SDI domain to stabilize ASH2L and create new H3/DNA contacts, while ASH2L protects DPY30 from proteasomal degradation.","evidence":"Biochemical reconstitution, SDI-domain mutagenesis, proteasome-inhibition and rescue assays","pmids":["36065180","35563756"],"confidence":"High","gaps":["DPY30 functions independent of ASH2L only inferred from rescue","Stoichiometry of the stabilized complex not defined"]},{"year":2011,"claim":"Identified the first post-translational modifications of ASH2L, showing arginine methylation at R296 by PRMT1/PRMT5 and establishing crosstalk between distinct chromatin-modifying enzyme complexes.","evidence":"In vitro methylation, mass spectrometry, and cell-based mutagenesis","pmids":["21285357"],"confidence":"High","gaps":["Functional consequence of R296 methylation for complex activity not resolved","Reader of the modification unknown"]},{"year":2025,"claim":"Extended the regulation of ASH2L to metabolic signaling by showing AARS1/HDAC1-mediated lactylation at K312 directs MLL recruitment to VEGFA to drive angiogenesis.","evidence":"Proteomics-identified PTM validated by ChIP-seq, Co-IP, and in vivo HCC tumor models","pmids":["40726441"],"confidence":"Medium","gaps":["Single-lab finding without independent confirmation","How K312-lac selects VEGFA over other loci not defined"]},{"year":2011,"claim":"Demonstrated that ASH2L is recruited to specific gene loci by sequence-specific transcription factors and signaling, rather than acting genome-wide indiscriminately, across muscle, developmental, and CCAAT-box promoters.","evidence":"Co-IP, ChIP, reporter and RNAi assays for Mef2d/p38 MAPK, Ap2δ, and NF-Y","pmids":["18026121","18495928","21445285","20046871"],"confidence":"Medium","gaps":["Direct contact interfaces between ASH2L and most transcription factors not mapped","Hierarchy among co-recruited subunits not fully resolved"]},{"year":2014,"claim":"Broadened ASH2L's role beyond H3K4 methylation to stabilizing the transcription pre-initiation complex at p53 pro-apoptotic genes and coordinating pre-mRNA processing.","evidence":"ChIP for PIC components (Pol II Ser5, TFIIB, TFIIF), RNAi, and splicing RT-PCR","pmids":["25023704","24782528","24715476"],"confidence":"Medium","gaps":["Mechanism linking ASH2L to PIC stabilization independent of H3K4me3 not defined","Pre-mRNA processing role rests on a single low-confidence study"]},{"year":2019,"claim":"Genetic loss-of-function across tissues established ASH2L as essential for stem/progenitor proliferation and differentiation programs via H3K4 methylation and downstream signaling effectors (Wnt-β-catenin, FoxM1, Onecut2/TGF-β, OSN pluripotency).","evidence":"Conditional knockout mice and ES cells with ChIP-seq, RNA-seq, and genetic/pharmacological rescue","pmids":["31164666","31315048","35819198","31555818","37433907","23239880"],"confidence":"Medium","gaps":["Whether developmental phenotypes are fully explained by H3K4me loss versus non-canonical roles not resolved","Tissue-specific target gene networks incompletely mapped"]},{"year":2023,"claim":"Defined ASH2L as essential for meiotic prophase progression, linking its H3K4me3 activity to transposon-repression pathways (H3K9me2, DNA methylation, piRNA) required for chromosomal synapsis.","evidence":"Germ-cell-specific conditional knockout with ChIP-seq, RNA-seq, and immunofluorescence","pmids":["39992154"],"confidence":"Medium","gaps":["Direct versus indirect control of repressive pathways not separated","Mitosis-dispensable but meiosis-essential distinction mechanistically unexplained"]},{"year":2025,"claim":"Revealed a non-canonical, methyltransferase-independent function of ASH2L in vascular smooth muscle, scaffolding a KLF5–FBXW7 complex to accelerate KLF5 ubiquitin-proteasomal degradation and restrain NOTCH3.","evidence":"Co-IP, mass spectrometry, ubiquitin assays, and conditional KO/overexpression mouse models","pmids":["39996311"],"confidence":"Medium","gaps":["Single-lab finding awaiting independent confirmation","Structural basis of the ASH2L–KLF5–FBXW7 complex unknown"]},{"year":null,"claim":"How ASH2L's diverse post-translational modifications, DNA-binding, and transcription-factor partnerships are integrated to achieve locus-specific H3K4 methylation versus its non-canonical degradation and PIC-stabilizing functions remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model distinguishing canonical from non-canonical ASH2L functions","Determinants directing ASH2L to specific genomic loci across contexts not defined","No timeline evidence linking ASH2L to a defined Mendelian disorder"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,3,5]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[7,9,13,14,15]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,5,20,30]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[2,5]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,12]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[0,12]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin 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Component or associated component of some histone methyltransferase complexes which regulates transcription through recruitment of those complexes to gene promoters (PubMed:19131338). Component of the Set1/Ash2 histone methyltransferase (HMT) complex, a complex that specifically methylates 'Lys-4' of histone H3, but not if the neighboring 'Lys-9' residue is already methylated (PubMed:19556245). As part of the MLL1/MLL complex it is involved in methylation and dimethylation at 'Lys-4' of histone H3 (PubMed:19556245). May play a role in hematopoiesis (PubMed:12670868). In association with RBBP5 and WDR5, stimulates the histone methyltransferase activities of KMT2A, KMT2B, KMT2C, KMT2D, SETD1A and SETD1B (PubMed:21220120, PubMed:22266653)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9UBL3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ASH2L","classification":"Not Classified","n_dependent_lines":311,"n_total_lines":1208,"dependency_fraction":0.2574503311258278},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"H2AFZ","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGA1","stoichiometry":0.2},{"gene":"NUCKS1","stoichiometry":0.2},{"gene":"RAN","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ASH2L","total_profiled":1310},"omim":[{"mim_id":"612033","title":"PAXIP1-ASSOCIATED GLUTAMATE-RICH PROTEIN 1; PAGR1","url":"https://www.omim.org/entry/612033"},{"mim_id":"612032","title":"DPY30 HISTONE METHYLTRANSFERASE COMPLEX REGULATORY SUBUNIT; DPY30","url":"https://www.omim.org/entry/612032"},{"mim_id":"611055","title":"SET DOMAIN-CONTAINING PROTEIN 1B; SETD1B","url":"https://www.omim.org/entry/611055"},{"mim_id":"611052","title":"SET DOMAIN-CONTAINING PROTEIN 1A; SETD1A","url":"https://www.omim.org/entry/611052"},{"mim_id":"609132","title":"LYSINE DEMETHYLASE 1A; KDM1A","url":"https://www.omim.org/entry/609132"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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DNA-binding-deficient mutants reduced ASH2L localization to the HOX locus, and a single K131A mutation in the WH domain broke chromatin domain boundary, implicating ASH2L in chromosome demarcation.\",\n      \"method\": \"X-ray crystallography, mutagenesis, ChIP\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and ChIP functional validation in a single rigorous study\",\n      \"pmids\": [\"21660059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of ASH2L reveals a forkhead-like helix-wing-helix (HWH) domain that binds DNA. In vivo, the HWH domain is required for binding to the β-globin locus control region, H3K4 trimethylation, and maximal β-globin gene expression.\",\n      \"method\": \"X-ray crystallography, mutagenesis, ChIP, gene expression analysis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with in vivo functional validation by mutagenesis and ChIP\",\n      \"pmids\": [\"21642971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ASH2L, via its N-terminal winged-helix (WH) motif (specifically K99), is essential for H2B ubiquitylation (H2Bub)-dependent H3K4 methylation by the MLL complex. Crosstalk between H2Bub and H3K4 methylation can occur in trans (ubiquitin does not need to be on nucleosomes or histones), and promotes MLL activity for all three methylation states. MLL3 does not respond to H2Bub, indicating regulatory specificity among MLL family members.\",\n      \"method\": \"In vitro methyltransferase assay, mutagenesis (K99 deletion/mutation), biochemical reconstitution\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with site-directed mutagenesis and multiple orthogonal assays\",\n      \"pmids\": [\"23453805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A non-active-site surface of the MLL1 SET domain (termed the Kabuki interaction surface, KIS) is required for interaction with the RbBP5/Ash2L heterodimer. Mutations at this surface (modeled on Kabuki syndrome MLL2 mutations) abolish H3K4 dimethylation by the MLL1 core complex and disrupt MLL1–WRAD or MLL1–RbBP5/Ash2L interaction, implicating Ash2L in forming a second active site within SET1 family core complexes.\",\n      \"method\": \"Mutagenesis, in vitro methyltransferase assay, co-immunoprecipitation\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and binding assays; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"24680668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Structural and genome-wide studies reveal that an extensive interaction network at the Dpy-30/Ash2L interface is critical for correct genome-wide placement of H3K4me2 and H3K4me3 but only modestly contributes to in vitro KMT2 methyltransferase activity. H3K4me2 peaks persisting after Dpy-30 loss occur in highly transcribed regions, indicating interplay between COMPASS kinetics and RNA polymerase cycling.\",\n      \"method\": \"Structural analysis, genome-wide ChIP-seq, in vitro methyltransferase assays\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural analysis combined with genome-wide and biochemical data; multiple orthogonal methods\",\n      \"pmids\": [\"30270175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DPY30 functions as an ASH2L-specific stabilizer: it increases ASH2L stability and enhances ASH2L-mediated interactions, promoting compaction and stabilization of the MLL1 complex to increase its HKMT activity. DPY30-stabilized ASH2L acquires additional interfaces with H3 and nucleosomal DNA, boosting MLL1 complex methyltransferase activity on nucleosomes.\",\n      \"method\": \"Biochemical reconstitution, in vitro methyltransferase assay, structural/biochemical analysis\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical reconstitution with multiple substrate assays; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"36065180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PRMT1 (and PRMT5) methylate Ash2L on Arg-296 both in vitro and in cells, representing the first post-translational modification identified on Ash2L and demonstrating cross-talk between chromatin-modifying enzyme complexes.\",\n      \"method\": \"In vitro methylation assay, mass spectrometry, mutagenesis, cell-based assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay combined with cell-based validation and site identification; single lab, two orthogonal methods\",\n      \"pmids\": [\"21285357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Ash2L-containing methyltransferase complexes are recruited to specific muscle-specific gene promoters during differentiation, directed by the transcriptional regulator Mef2d. p38 MAPK signaling phosphorylates Mef2d to modulate this interaction, resulting in H3K4me3 at target promoters and epigenetic marking for gene expression.\",\n      \"method\": \"ChIP, co-immunoprecipitation, signaling pathway analysis (p38 MAPK inhibition/activation)\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and ChIP with pharmacological and genetic epistasis in differentiation context; multiple orthogonal methods\",\n      \"pmids\": [\"18026121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ash2L physically interacts with Tbx1 in both yeast two-hybrid and mammalian co-immunoprecipitation assays, acts as a transcriptional co-activator in luciferase reporter assays, and overlapping expression patterns exist during development. Ash2l-null embryos die early in gestation, demonstrating Ash2l is essential for early embryogenesis.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, luciferase reporter assay, gene-trap knockout mouse\",\n      \"journal\": \"Experimental biology and medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid and co-IP interaction with functional reporter assay and KO phenotype; single lab\",\n      \"pmids\": [\"20463296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Ap2delta physically interacts exclusively with Ash2l (identified by yeast two-hybrid), and this interaction mediates Ap2delta transactivation. Ap2delta associates with endogenous ASH2L and MLL2 (ALR) in a complex that methylates H3K4. Ap2delta recruits Ash2l and ALR to the Hoxc8 locus, leading to H3K4me3 and gene activation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, ChIP, luciferase reporter assay\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus Co-IP plus ChIP; single lab, multiple methods\",\n      \"pmids\": [\"18495928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NF-Y acts upstream of H3K4me3 deposition by specifically recruiting Ash2L to CCAAT-containing promoters. Knockdown of NF-Y subunits prevents promoter association of Ash2L (but not MLL1 or WDR5), causing a dramatic drop in H3K4me3. Endogenous NF-Y and Ash2L interact in vivo. Additionally, Ash2L knockdown globally reduces H3K4me3 with concomitant increase in H3K79me2.\",\n      \"method\": \"ChIP, RNAi knockdown, co-immunoprecipitation, transcriptional profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with RNAi and Co-IP, multiple orthogonal methods; single lab\",\n      \"pmids\": [\"21445285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ASH2L and MYC interact directly in vitro and co-localize in cells and on chromatin. MYC associates with H3K4 methyltransferase activity dependent on ASH2L. MYC stimulates demethylation and acetylation of H3K27 through association with KMT2 complexes. WDR5, another KMT2 subunit, also binds directly to MYC.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, ChIP, genome-wide analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro direct binding plus Co-IP and ChIP; single lab, multiple methods\",\n      \"pmids\": [\"24782528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ash2L is recruited to the inactive X chromosome (Xi) by Xist RNA concomitantly with Saf-A and macroH2A, characterizing a developmental transition to Xi maintenance. A mutant Xist that does not cause gene repression still triggers Ash2L recruitment and chromosome-wide H4 hypoacetylation, indicating that Ash2L recruitment is mechanistically separable from gene silencing.\",\n      \"method\": \"Immunofluorescence, RNA FISH, cell fractionation, mutant Xist RNA expression\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by immunofluorescence with functional genetic dissection using mutant Xist; single lab\",\n      \"pmids\": [\"20150277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ASH2L is recruited to the enhancer of the ERα (ESR1) gene through GATA3, and acts as a co-activator of GATA3 to promote ERα transcription in breast cancer cells. Depletion of ASH2L suppresses ERα expression; forced expression of ASH2L induces it.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, RNAi knockdown, forced expression assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP plus functional gain/loss-of-function; single lab\",\n      \"pmids\": [\"25258321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Ash2L is required for P53-dependent apoptosis: upon P53 stabilization, pro-apoptotic target promoters are enriched with H3K4me3 and Wdr5, RbBP5, and Ash2L. Ash2L silencing abrogates P53-induced target gene expression and reduces RNA Pol II Ser5-CTD phosphorylation, TFIIB, and TFIIF (RAP74) occupancy, indicating Ash2L aids formation of a stable transcription pre-initiation complex.\",\n      \"method\": \"ChIP, RNAi knockdown, gene expression analysis, overexpression assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with multiple PIC components, gain/loss-of-function; single lab\",\n      \"pmids\": [\"25023704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Ash2l directly binds to super-enhancers of stemness genes (Jarid2, Nanog, Sox2, Oct4) and recruits Oct4/Sox2/Nanog (OSN) to form an Ash2l/OSN complex that drives enhancer activation and pluripotency. The W118A mutation disrupting the Ash2l-Oct4 interaction fails to rescue enhancer activation, validating the direct interaction is required. CRISPRi blocking of Ash2l-binding motifs at super-enhancers prevents OSN recruitment.\",\n      \"method\": \"ChIP, co-immunoprecipitation, CRISPRi/dCas9, mutagenesis, gene expression analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods including mutagenesis and CRISPRi; single lab\",\n      \"pmids\": [\"31555818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of Ash2l in the murine hematopoietic system causes global reduction of H3K4 methylation, deregulated gene expression (including downregulation of mitosis-associated genes), accumulation of LSK cells in G2-phase, and failure of hematopoietic stem/progenitor cell proliferation and differentiation.\",\n      \"method\": \"Conditional knockout mouse, flow cytometry, gene expression analysis, H3K4 methylation assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined cellular and molecular phenotypes; single lab\",\n      \"pmids\": [\"31164666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ASH2L loss in neural progenitor cells impairs H3K4me3, reduces Wnt-β-catenin signaling transcriptional machinery, inhibits S-phase entry of NPCs, and causes neocortex malformation with fewer neurons. Overexpressing β-catenin after ASH2L elimination rescues the proliferation deficiency, placing ASH2L upstream of Wnt signaling in neurogenesis.\",\n      \"method\": \"Conditional knockout mouse, ChIP, gene expression analysis, epistasis by β-catenin rescue\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with genetic epistasis rescue and ChIP; single lab\",\n      \"pmids\": [\"31315048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of Ash2l in mouse embryo fibroblasts (MEFs) causes global reduction of H3K4me1 and H3K4me3, increased histone H3 loading and reduced chromatin accessibility at CpG island promoters, downregulation of FoxM1-responsive genes, and induction of senescence. Exogenous FOXM1 is sufficient to delay senescence.\",\n      \"method\": \"Conditional knockout MEFs, ATAC-seq, ChIP-seq, gene expression analysis, FOXM1 rescue experiment\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with multiple genome-wide assays and genetic rescue; single lab\",\n      \"pmids\": [\"35819198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of Ash2l reduces chromatin accessibility at promoters, increases loading of histone H3, alters activating and repressive histone marks, and alters CTCF binding (lost at promoter-associated sites, gained at intergenic sites), correlating with gene repression.\",\n      \"method\": \"ATAC-seq, ChIP-seq, conditional knockout MEFs\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ATAC-seq and ChIP-seq in conditional KO; single lab\",\n      \"pmids\": [\"36513698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The ASH2L SDI (Sdc1 DPY30 interaction) domain is required for recognition and binding of DPY30. Loss of Ash2l causes DPY30 degradation via the ubiquitin-proteasomal pathway. Three specific amino acids in the SDI domain are essential for DPY30 binding. Overexpression of DPY30 in Ash2l-depleted cells rescues Ccnd1 expression and abnormal cell cycle, indicating DPY30 can act in other complexes independently of ASH2L.\",\n      \"method\": \"Mouse model, conditional knockout, mutagenesis, proteasome inhibition assay, western blot, ChIP-seq/RNA-seq analysis\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with proteasome pathway analysis and rescue experiment; single lab\",\n      \"pmids\": [\"35563756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Ap2delta is required for recruitment of Ash2l-containing complexes to the Fgfr3 promoter, and this recruitment leads to H3K4me3 and Fgfr3 transcriptional activation. Ash2l and Ap2delta co-regulate 42 genes identified by genome-wide expression profiling.\",\n      \"method\": \"ChIP, RNAi knockdown, gene expression profiling (microarray)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with RNAi functional validation; single lab\",\n      \"pmids\": [\"20046871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Cell-penetrating peptides derived from ASH2L's DPY30-binding domain specifically inhibit DPY30's interaction with ASH2L and reduce H3K4 methylation in cells, suppressing growth of MLL-rearranged leukemia and MYC-dependent hematologic cancer cells.\",\n      \"method\": \"Peptide competition assay, cell viability assays, H3K4 methylation assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical competition with functional cellular readout; single lab\",\n      \"pmids\": [\"31251903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ASH2L-B, a major isoform highly expressed in embryonic stem cells, is directly activated by OCT4 transcription. ASH2L-B is required for somatic cell reprogramming and for H3K4 methylation levels during reprogramming.\",\n      \"method\": \"ChIP, reporter assay, gene knockdown, reprogramming efficiency assay, western blot\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and loss-of-function with functional reprogramming readout; single lab\",\n      \"pmids\": [\"30269953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ASH2L associates with ERα and is recruited to cis-regulatory elements of the PAX2 gene, where it modulates H3K4me3 and H3K27me3 levels to enhance ERα-mediated transactivation. Knockdown of ASH2L reduces PAX2 expression and suppresses endometrial cancer cell proliferation and migration.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, RNAi knockdown, cell proliferation and migration assays\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP with functional KD phenotype; single lab\",\n      \"pmids\": [\"32279431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASH2L is essential for meiotic prophase progression but dispensable for mitosis in differentiated spermatogonia. Ash2l deficiency causes global loss of H3K4me3 at promoters, downregulation of genes in H3K9 di-methylation, DNA methylation and piRNA pathways important for transposon repression, leading to meiotic arrest with failures in chromosomal synapsis and ectopic LINE1-ORF1P expression.\",\n      \"method\": \"Germ cell-specific conditional KO mouse, ChIP-seq, RNA-seq, immunofluorescence\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with ChIP-seq and RNA-seq; single lab\",\n      \"pmids\": [\"39992154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Dpy-30 and Ash2L associate (by co-immunoprecipitation) with neural plate border transcription factors Msx1 and Tfap2a in Xenopus. ChIP demonstrates Ash2L and H3K4me3 accumulate at the sox10 promoter in a Tfap2a-dependent manner, establishing that Ash2l interacts with specific transcription factors to recruit COMPASS to neural crest gene regulatory regions.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, morpholino knockdown\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP in Xenopus with loss-of-function; single lab\",\n      \"pmids\": [\"36162552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASH2L interacts with SET1/MLL family members (SETD1A, SETD1B, MLL1, MLL2) in glioblastoma cells as determined by mass spectrometry. ASH2L depletion leads to cell cycle arrest, apoptosis, and downregulation of cell cycle regulatory genes (TRA2B, BARD1, KIF20B, ARID4A, SMARCC1) as determined by RNA-seq and CUT&RUN.\",\n      \"method\": \"CRISPR/Cas9 screen, mass spectrometry, RNA-seq, CUT&RUN, orthotopic in vivo model\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based interaction mapping with functional CRISPR KO and genomic assays; single lab\",\n      \"pmids\": [\"37974198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASH2L-mediated H3K4me3 at the HIPK2 and ADAM17 promoters triggers their transcription, leading to aberrant activation of Notch1 signaling, contributing to fibrosis and inflammation in diabetic nephropathy. Loss of ASH2L in db/db mice reduces glomerular injury.\",\n      \"method\": \"ChIP, conditional knockout mouse (AAV-shRNA), gene expression analysis\",\n      \"journal\": \"Translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with in vivo KD and functional outcome; single lab\",\n      \"pmids\": [\"37879562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASH2L upregulation activates STEAP4 transcription (via H3K4me3) in endothelial cells, elevating copper uptake through CTR1, triggering oxidative stress and inflammatory responses that cause endothelial dysfunction. Endothelial-specific ASH2L knockdown in db/db mice restores endothelium-dependent relaxation.\",\n      \"method\": \"ChIP, AAV-shRNA knockdown in vivo, cell-based assays, copper transport assays\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with in vivo loss-of-function and mechanistic pathway validation; single lab\",\n      \"pmids\": [\"37903897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In pulmonary arterial smooth muscle cells, ASH2L deficiency promotes SMC proliferation and vascular remodeling independently of canonical H3K4me3-based transcriptional activation. Instead, ASH2L forms a protein complex with KLF5 and FBXW7, accelerating ubiquitin-proteasomal degradation of KLF5. Loss of ASH2L promotes KLF5 recruitment to the NOTCH3 promoter and enhances NOTCH3 expression.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, ChIP, conditional KO/overexpression mouse, ubiquitin assay\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP plus in vivo models, multiple orthogonal methods; single lab\",\n      \"pmids\": [\"39996311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AARS1 and HDAC1 mediate lactylation of ASH2L at lysine 312 (K312-lac). ASH2L-K312-lac is enriched in VEGFA genomic regions, facilitates targeted recruitment of the MLL complex, and enhances VEGFA expression through synergistic activation of enhancers and promoters, promoting tumor angiogenesis in HCC.\",\n      \"method\": \"High-throughput proteomics, ChIP-seq, co-immunoprecipitation, in vivo tumor models\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics-identified PTM with ChIP-seq and Co-IP validation; single lab\",\n      \"pmids\": [\"40726441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ASH2L promotes ASH2L-mediated H3K4me3 and scavenger receptor (including PPARγ) transcription in endothelial cells, and enhances CD36/TLR4 interaction to activate NF-κB pro-inflammatory signaling. Endothelial-specific Ash2l knockdown reduces atherosclerotic lesion formation in ApoE-/- mice.\",\n      \"method\": \"ChIP, co-immunoprecipitation, AAV-shRNA in vivo knockdown, cell-based assays\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and Co-IP with in vivo functional validation; single lab\",\n      \"pmids\": [\"38280036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Glucocorticoid receptor (uGR) and ASH2L interact in a common protein complex in myeloid leukemia cells, with uGR and ASH2L binding to BCL2L1 via chromatin looping to maintain BCL-XL over-expression. Upon dexamethasone treatment, GR and ASH2L recruitment is reduced, BCL-XL expression diminishes, and apoptosis is induced.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, chromosome conformation assay, gene expression analysis\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, and chromatin looping assay; single lab\",\n      \"pmids\": [\"31870784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Depletion of WAR subcomplex components (WDR5, ASH2L, RBBP5) leads to increased levels of unspliced FOS transcripts without necessarily affecting mature transcript levels or H3K4me3 at the promoter, revealing a role for ASH2L in coordinating transcription with efficient pre-mRNA processing.\",\n      \"method\": \"RNAi knockdown, RT-PCR for spliced/unspliced transcripts, ChIP\",\n      \"journal\": \"Cellular & molecular biology letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, functional RNAi with limited mechanistic follow-up\",\n      \"pmids\": [\"24715476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RNAi knockdown of Ash2l in embryonic stem cells reduces H3K4 methylation levels and drives cells to a silenced chromatin state with elevated H3K9me3. Genome-wide ChIP-seq shows Ash2l is enriched at genes regulating open chromatin, including chromatin remodeler Chd7, c-Myc, and H3K9 demethylase Kdm4c.\",\n      \"method\": \"RNAi knockdown, ChIP-seq, western blot for histone modifications\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, RNAi with genome-wide profiling but limited mechanistic dissection\",\n      \"pmids\": [\"23239880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASH2L-mediated H3K4me3 at the Onecut2 (a bivalent locus) promoter maintains its expression in neural stem/progenitor cells. Loss of Ash2l reduces Onecut2 expression; constitutive Onecut2 expression rescues defective NSPC proliferation and differentiation. Onecut2 modulates TGF-β signaling, and TGF-β inhibitor treatment rectifies the Ash2l-deficient NSPC phenotype.\",\n      \"method\": \"Conditional KO mouse, RNA-seq, ChIP, genetic rescue, pharmacological inhibition\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with genetic and pharmacological epistasis; single lab\",\n      \"pmids\": [\"37433907\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ASH2L is a core scaffolding and regulatory subunit of the COMPASS/SET1-MLL family of histone H3K4 methyltransferase complexes; it contains an N-terminal winged-helix/forkhead-like HWH domain that directly binds DNA, an atypical PHD finger, and an SDI domain that binds and stabilizes DPY30, and it is itself post-translationally modified by PRMT1/PRMT5 arginine methylation (at R296) and by lactylation (at K312); within the core complex (WRAD: WDR5, RBBP5, ASH2L, DPY30), ASH2L is required for H2B ubiquitylation-dependent trans-stimulation of H3K4 di- and trimethylation through its WH motif (K99), contributes to formation of a second active site on nucleosomes, facilitates DPY30-mediated complex stabilization, and cooperates with sequence-specific transcription factors (Mef2d, Ap2δ, NF-Y, GATA3, OCT4, Tbx1, Tfap2a) and signaling pathways (p38 MAPK) to target H3K4me3 to specific gene loci; it also plays non-canonical roles including forming a complex with KLF5 and FBXW7 to accelerate KLF5 ubiquitin-proteasomal degradation in vascular smooth muscle, enabling stable transcription pre-initiation complex formation at p53 pro-apoptotic targets, and coordinating pre-mRNA processing, while being essential for embryogenesis, hematopoiesis, neurogenesis, and other tissue-specific developmental programs.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ASH2L is a core scaffolding and regulatory subunit of the SET1/MLL (COMPASS-family) histone H3K4 methyltransferase complexes that couples chromatin marking to gene activation across embryogenesis, hematopoiesis, neurogenesis, and meiosis [#16, #17, #25]. Structurally, its N-terminal forkhead-like winged-helix (HWH) domain binds DNA directly and is required for recruitment to target loci such as the HOX and \\u03b2-globin regions, H3K4 trimethylation, and chromatin domain demarcation [#0, #1]. Within the WRAD core, ASH2L is essential for H2B-ubiquitylation\\u2013dependent trans-stimulation of all three H3K4 methylation states through its WH motif residue K99, and it contributes a non-active-site surface that, with RbBP5, forms a second active site on nucleosomes required for MLL1 dimethylation activity [#2, #3]. Its SDI domain binds and stabilizes DPY30, which in turn stabilizes ASH2L and reciprocally boosts MLL complex compaction and methyltransferase activity on nucleosomes; disrupting this interface dysregulates genome-wide H3K4me2/me3 placement [#4, #5, #20]. ASH2L does not act constitutively but is targeted to specific loci by sequence-specific transcription factors and signaling inputs\\u2014including Mef2d (downstream of p38 MAPK), Ap2\\u03b4, NF-Y, GATA3, MYC, OCT4/SOX2/NANOG, and Tfap2a\\u2014to deposit activating H3K4me3 at lineage- and stimulus-specific genes [#7, #9, #10, #11, #13, #15, #26]. ASH2L is itself post-translationally modified, being arginine-methylated at R296 by PRMT1/PRMT5 and lactylated at K312 by AARS1/HDAC1, the latter directing MLL recruitment to VEGFA for tumor angiogenesis [#6, #31]. Beyond canonical methyltransferase scaffolding, ASH2L supports stable transcription pre-initiation complex assembly at p53 pro-apoptotic targets [#14] and acts non-canonically in vascular smooth muscle by forming a KLF5\\u2013FBXW7 complex that accelerates KLF5 ubiquitin-proteasomal degradation independently of H3K4me3 [#30].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established the structural basis for how ASH2L engages chromatin directly rather than only as a passive scaffold, by resolving an atypical PHD finger and a DNA-binding winged-helix/HWH domain required for locus targeting and H3K4me3.\",\n      \"evidence\": \"X-ray crystallography with mutagenesis and ChIP at the HOX and \\u03b2-globin loci\",\n      \"pmids\": [\"21660059\", \"21642971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sequence determinants of DNA recognition specificity unresolved\", \"Does not establish how DNA binding is integrated with transcription-factor-directed recruitment\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed mechanistically why ASH2L is required for the H2Bub\\u2013H3K4 methylation crosstalk, defining the WH motif residue K99 as essential for trans-stimulation of all three methylation states.\",\n      \"evidence\": \"In vitro reconstituted methyltransferase assays with K99 mutagenesis\",\n      \"pmids\": [\"23453805\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular sensor that transmits the ubiquitin signal to the active site not defined\", \"Why MLL3 is unresponsive not explained at residue level\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the ASH2L/RbBP5 heterodimer as forming a second active site on the MLL1 SET domain, explaining a disease-relevant non-active-site interaction surface.\",\n      \"evidence\": \"Mutagenesis modeled on Kabuki-syndrome mutations with in vitro methyltransferase and Co-IP assays\",\n      \"pmids\": [\"24680668\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct structural visualization of the second active site on nucleosomes not provided\", \"Generality across all SET1/MLL members not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reconciled in vitro versus in vivo roles by showing the DPY30/ASH2L interface governs genome-wide H3K4me placement more than bulk catalytic rate, linking COMPASS kinetics to RNA polymerase cycling.\",\n      \"evidence\": \"Structural analysis combined with genome-wide ChIP-seq and in vitro methyltransferase assays\",\n      \"pmids\": [\"30270175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal coupling between Pol II elongation and persistent H3K4me2 peaks not demonstrated\", \"Locus-selectivity mechanism unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established a reciprocal stabilization mechanism in which DPY30 binds the ASH2L SDI domain to stabilize ASH2L and create new H3/DNA contacts, while ASH2L protects DPY30 from proteasomal degradation.\",\n      \"evidence\": \"Biochemical reconstitution, SDI-domain mutagenesis, proteasome-inhibition and rescue assays\",\n      \"pmids\": [\"36065180\", \"35563756\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DPY30 functions independent of ASH2L only inferred from rescue\", \"Stoichiometry of the stabilized complex not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified the first post-translational modifications of ASH2L, showing arginine methylation at R296 by PRMT1/PRMT5 and establishing crosstalk between distinct chromatin-modifying enzyme complexes.\",\n      \"evidence\": \"In vitro methylation, mass spectrometry, and cell-based mutagenesis\",\n      \"pmids\": [\"21285357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of R296 methylation for complex activity not resolved\", \"Reader of the modification unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended the regulation of ASH2L to metabolic signaling by showing AARS1/HDAC1-mediated lactylation at K312 directs MLL recruitment to VEGFA to drive angiogenesis.\",\n      \"evidence\": \"Proteomics-identified PTM validated by ChIP-seq, Co-IP, and in vivo HCC tumor models\",\n      \"pmids\": [\"40726441\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding without independent confirmation\", \"How K312-lac selects VEGFA over other loci not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated that ASH2L is recruited to specific gene loci by sequence-specific transcription factors and signaling, rather than acting genome-wide indiscriminately, across muscle, developmental, and CCAAT-box promoters.\",\n      \"evidence\": \"Co-IP, ChIP, reporter and RNAi assays for Mef2d/p38 MAPK, Ap2\\u03b4, and NF-Y\",\n      \"pmids\": [\"18026121\", \"18495928\", \"21445285\", \"20046871\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct contact interfaces between ASH2L and most transcription factors not mapped\", \"Hierarchy among co-recruited subunits not fully resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Broadened ASH2L's role beyond H3K4 methylation to stabilizing the transcription pre-initiation complex at p53 pro-apoptotic genes and coordinating pre-mRNA processing.\",\n      \"evidence\": \"ChIP for PIC components (Pol II Ser5, TFIIB, TFIIF), RNAi, and splicing RT-PCR\",\n      \"pmids\": [\"25023704\", \"24782528\", \"24715476\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking ASH2L to PIC stabilization independent of H3K4me3 not defined\", \"Pre-mRNA processing role rests on a single low-confidence study\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genetic loss-of-function across tissues established ASH2L as essential for stem/progenitor proliferation and differentiation programs via H3K4 methylation and downstream signaling effectors (Wnt-\\u03b2-catenin, FoxM1, Onecut2/TGF-\\u03b2, OSN pluripotency).\",\n      \"evidence\": \"Conditional knockout mice and ES cells with ChIP-seq, RNA-seq, and genetic/pharmacological rescue\",\n      \"pmids\": [\"31164666\", \"31315048\", \"35819198\", \"31555818\", \"37433907\", \"23239880\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether developmental phenotypes are fully explained by H3K4me loss versus non-canonical roles not resolved\", \"Tissue-specific target gene networks incompletely mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined ASH2L as essential for meiotic prophase progression, linking its H3K4me3 activity to transposon-repression pathways (H3K9me2, DNA methylation, piRNA) required for chromosomal synapsis.\",\n      \"evidence\": \"Germ-cell-specific conditional knockout with ChIP-seq, RNA-seq, and immunofluorescence\",\n      \"pmids\": [\"39992154\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect control of repressive pathways not separated\", \"Mitosis-dispensable but meiosis-essential distinction mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a non-canonical, methyltransferase-independent function of ASH2L in vascular smooth muscle, scaffolding a KLF5\\u2013FBXW7 complex to accelerate KLF5 ubiquitin-proteasomal degradation and restrain NOTCH3.\",\n      \"evidence\": \"Co-IP, mass spectrometry, ubiquitin assays, and conditional KO/overexpression mouse models\",\n      \"pmids\": [\"39996311\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding awaiting independent confirmation\", \"Structural basis of the ASH2L\\u2013KLF5\\u2013FBXW7 complex unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ASH2L's diverse post-translational modifications, DNA-binding, and transcription-factor partnerships are integrated to achieve locus-specific H3K4 methylation versus its non-canonical degradation and PIC-stabilizing functions remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model distinguishing canonical from non-canonical ASH2L functions\", \"Determinants directing ASH2L to specific genomic loci across contexts not defined\", \"No timeline evidence linking ASH2L to a defined Mendelian disorder\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 3, 5]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [7, 9, 13, 14, 15]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 5, 20, 30]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 12]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [2, 4, 19]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [7, 10, 14]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 17, 25, 26]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [16, 18, 27]}\n    ],\n    \"complexes\": [\"WRAD (WDR5-RBBP5-ASH2L-DPY30) core\", \"SET1/MLL (COMPASS) H3K4 methyltransferase complex\"],\n    \"partners\": [\"DPY30\", \"WDR5\", \"RBBP5\", \"MLL1\", \"MYC\", \"OCT4\", \"KLF5\", \"GATA3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}