{"gene":"METTL3","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2016,"finding":"METTL3 associates with ribosomes in the cytoplasm and promotes translation of specific mRNAs (e.g., EGFR, TAZ) through interaction with the translation initiation machinery. Both wild-type and catalytically inactive METTL3 promote translation when tethered to a reporter mRNA, indicating a methyltransferase-independent translational role.","method":"Ribosome association assay, tethering reporter assay, loss- and gain-of-function studies, co-immunoprecipitation with translation initiation factors","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional assays including catalytic-dead mutant tethering, ribosome fractionation, and loss/gain-of-function studies in multiple cell lines","pmids":["27117702"],"is_preprint":false},{"year":2018,"finding":"METTL3 is SUMOylated at lysine residues K177, K211, K212, and K215 by SUMO1; this modification is reversed by SENP1. SUMOylation does not alter METTL3 stability, localization, or interaction with METTL14 and WTAP, but significantly represses its m6A methyltransferase activity, reducing m6A levels in mRNAs.","method":"Site-directed mutagenesis (4KR mutant), in vivo SUMOylation assay, m6A quantification, co-immunoprecipitation with METTL14/WTAP, colony formation assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of SUMOylation sites with functional rescue, orthogonal enzymatic activity assay, single lab with multiple methods","pmids":["29506078"],"is_preprint":false},{"year":2018,"finding":"Conditional knockout of Mettl3 in mouse nervous system causes cerebellar hypoplasia due to enhanced apoptosis of cerebellar granule cells; METTL3 depletion leads to extended RNA half-lives and aberrant splicing events, demonstrating that METTL3-mediated m6A regulates mRNA stability and splicing in cerebellar development.","method":"Conditional knockout mouse (cKO), transcriptome-wide m6A mapping, RNA half-life measurement, splicing analysis, histology","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean in vivo conditional KO with defined cellular phenotype, transcriptome-wide m6A and RNA stability measurements, single lab","pmids":["29879109"],"is_preprint":false},{"year":2019,"finding":"Mettl3-mediated m6A modification of CD40, CD80, and TLR4 signaling adaptor Tirap mRNAs enhances their translation in dendritic cells, promoting DC maturation, NF-κB signaling, and IL-12 cytokine production.","method":"DC-specific Mettl3 conditional knockout, RNA immunoprecipitation, translation reporter assay, co-stimulatory molecule expression analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-type-specific KO with defined molecular targets and functional immune readouts, multiple orthogonal methods","pmids":["31015515"],"is_preprint":false},{"year":2019,"finding":"METTL3 methylates TFEB mRNA at two m6A residues in the 3'-UTR, promoting association of HNRNPD with TFEB pre-mRNA and decreasing TFEB expression levels, thereby negatively regulating autophagy. TFEB in turn inhibits METTL3 mRNA stability (post-transcriptionally) and induces ALKBH5, establishing a negative feedback loop.","method":"m6A-RIP, RNA immunoprecipitation (RIP), siRNA knockdown, overexpression, autophagic flux assay, GST pull-down","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (MeRIP, RIP, RNA stability) identifying specific m6A sites and downstream reader, single lab","pmids":["30870073"],"is_preprint":false},{"year":2022,"finding":"Lactate in the tumor microenvironment induces METTL3 upregulation via H3K18 lactylation at the METTL3 promoter. METTL3 is also directly lactylated at two sites in its zinc-finger domain, which is required for target RNA capture. METTL3-mediated m6A on Jak1 mRNA is recognized by YTHDF1, enhancing JAK1 protein translation and STAT3 phosphorylation in tumor-infiltrating myeloid cells.","method":"MeRIP-seq, RIP, mass spectrometry identification of lactylation sites, site-directed mutagenesis of zinc-finger domain, JAK1 translation reporter, phospho-STAT3 western blot, myeloid-specific Mettl3 KO mice","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — mass spectrometry identification of PTM sites, mutagenesis, in vivo KO, multiple orthogonal mechanistic experiments","pmids":["35320754"],"is_preprint":false},{"year":2022,"finding":"METTL3 catalyzes m6A modification on TERRA (telomeric repeat-containing RNA); the m6A-modified TERRA is recognized and stabilized by the reader YTHDC1. Loss of METTL3 or YTHDC1 enhances TERRA degradation, reduces R-loop formation at telomeres, and leads to telomere shortening and instability in ALT cancer cells.","method":"MeRIP, YTHDC1 RIP, R-loop detection (DRIP), METTL3 knockdown/knockout, telomere length assay, TERRA stability assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (MeRIP, DRIP, telomere length), replicated across multiple experimental approaches in single study, defined molecular mechanism","pmids":["36399511"],"is_preprint":false},{"year":2022,"finding":"METTL3-mediated m6A modification of TAB3 mRNA at stop codon regions increases TAB3 mRNA stability through binding of the reader IGF2BP2, leading to NF-κB-dependent renal inflammation. Genetic and pharmacological (Cpd-564) METTL3 inhibition attenuates renal injury.","method":"MeRIP-seq, RNA-seq, RIP-qPCR, conditional Mettl3 KO mice, AAV9-mediated silencing, pharmacological inhibitor","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — MeRIP-seq target identification, in vivo conditional KO, pharmacological validation, multiple orthogonal methods","pmids":["35417191"],"is_preprint":false},{"year":2021,"finding":"METTL3-mediated m6A modification of the Tcf7 3'-UTR stabilizes Tcf7 mRNA in T follicular helper cells; loss of METTL3 or mutation of the Tcf7 m6A site accelerates Tcf7 transcript decay and impairs TFH differentiation. Ectopic TCF-1 expression rescues TFH defects caused by METTL3 deficiency.","method":"CD4+ T cell-specific Mettl3 conditional KO, m6A-miCLIP-seq, RNA decay assay, site-directed m6A site mutation, rescue experiment with TCF-1 overexpression","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO, transcriptome-wide m6A mapping (miCLIP-seq), site mutagenesis, genetic rescue, multiple orthogonal methods","pmids":["33637761"],"is_preprint":false},{"year":2020,"finding":"METTL3 reduces m6A modification on MIS12 mRNA in human mesenchymal stem cells; loss of m6A accelerates MIS12 mRNA turnover, reducing MIS12 expression and promoting cellular senescence. The m6A reader IGF2BP2 recognizes and stabilizes m6A-modified MIS12 mRNA.","method":"m6A transcriptional profiling, METTL3 KO/overexpression in hMSCs, RNA stability assay, IGF2BP2 RIP, senescence assays (SA-β-gal, p21)","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (m6A profiling, RIP, RNA stability) in human stem cell model, single lab","pmids":["33035345"],"is_preprint":false},{"year":2021,"finding":"METTL3 depletion decreases m6A levels in SARS-CoV-2 RNA; m6A reduction in viral RNA increases RIG-I binding and enhances downstream innate immune signaling and inflammatory gene expression, revealing that METTL3-deposited m6A on viral RNA dampens innate immune sensing.","method":"m6A-seq of SARS-CoV-2 genome, METTL3 siRNA depletion, RIG-I RIP, innate immune gene expression analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m6A-seq and RIG-I RIP linking m6A status to immune sensor binding, single lab, two orthogonal approaches","pmids":["33961823"],"is_preprint":false},{"year":2022,"finding":"METTL3 is responsible for >95% of m6A in mRNA as demonstrated by exon 4 deletion of Mettl3; apparent METTL3-independent m6A in prior studies was due to expression of alternatively spliced METTL3 isoforms that bypass CRISPR/Cas9 mutations and retain methyltransferase activity.","method":"CRISPR/Cas9 exon 4 deletion, alternative splicing analysis, m6A quantification by LC-MS/MS, functional activity assay of splice isoforms","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — rigorous genetic deletion with exon 4 approach, LC-MS/MS m6A quantification, mechanistic explanation of prior discrepancies with functional characterization of isoforms","pmids":["35853000"],"is_preprint":false},{"year":2022,"finding":"METTL3 promotes skeletal muscle hypertrophy by repressing m6A-dependent synthesis of activin type 2A receptor (ACVR2A), blunting anti-hypertrophic myostatin signaling. Myofiber-specific conditional Mettl3 deletion causes spontaneous muscle wasting; exogenous METTL3 delivery induces muscle growth even without external triggers.","method":"Myofiber-specific conditional Mettl3 KO mice, overload-induced hypertrophy model, m6A-seq of muscle, AAV-mediated METTL3 delivery, myostatin inhibitor co-administration rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO with defined phenotype, genome-wide m6A profiling, specific downstream target (ACVR2A) identified, genetic rescue with myostatin inhibitor","pmids":["35013323"],"is_preprint":false},{"year":2021,"finding":"METTL3-mediated m6A modification of ATG7 mRNA attenuates ATG7 RNA stability, impairing autophagosome formation and promoting cellular senescence via the GATA4 axis in fibroblast-like synoviocytes.","method":"m6A-methylated RNA immunoprecipitation, RNA immunoprecipitation, siRNA knockdown, autophagic flux assay, intra-articular AAV9-siMETTL3 injection in DMM mouse model","journal":"Annals of the rheumatic diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP and RIP identifying specific target mRNA, in vivo validation with AAV, single lab","pmids":["34706873"],"is_preprint":false},{"year":2024,"finding":"ARID1A recognizes R-loops in an ATM-dependent manner and recruits METTL3 and METTL14 to R-loop RNA, leading to m6A methylation of R-loop RNA. This m6A modification facilitates recruitment of RNase H1 to drive R-loop resolution and promote DNA end resection at double-strand breaks, ensuring genome stability.","method":"Co-immunoprecipitation, ChIP, in vitro R-loop binding assay, MeRIP, RNase H1 recruitment assay, DNA end resection assay, METTL3/METTL14/ARID1A depletion with comet assay and cell survival","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying ordered complex, functional MeRIP, RNase H1 recruitment, DNA repair readout, multiple orthogonal methods","pmids":["38358891"],"is_preprint":false},{"year":2024,"finding":"Lactate promotes p300-mediated H3K18 lactylation at the METTL3 promoter, increasing METTL3 expression. METTL3-mediated m6A modification is enriched in ACSL4 mRNA and its stability is regulated through a YTHDC1-dependent pathway, promoting ferroptosis in alveolar epithelial cells during sepsis-associated lung injury.","method":"H3K18la ChIP at METTL3 promoter, MeRIP for ACSL4, YTHDC1 RIP, METTL3 knockdown/inhibitor in ALI mouse model","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, MeRIP, RIP with functional ferroptosis readout, multiple methods in single lab","pmids":["38852200"],"is_preprint":false},{"year":2024,"finding":"TRIP12, a HECT-domain E3 ubiquitin ligase, acts as a negative regulator of METTL3 protein expression by facilitating K48-linked polyubiquitination of METTL3 in inflammatory microglia; METTL3 protein is upregulated in TBI not through transcription but through reduced proteasomal degradation. METTL3 stabilizes BATF mRNA in an m6A-IGF2BP2-dependent manner to drive neuroinflammation.","method":"Co-immunoprecipitation, ubiquitination assay (K48-linkage specific), MeRIP-seq, CUT&Tag, IGF2BP2 RIP, selective microglial Mettl3 ablation in TBI mouse model","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — K48-ubiquitin linkage assay identifies specific E3 ligase, MeRIP-seq, IGF2BP2 RIP, in vivo conditional KO with functional recovery readout, multiple orthogonal methods","pmids":["38902548"],"is_preprint":false},{"year":2025,"finding":"p300-mediated acetylation of METTL3 (occurring specifically on H3K27ac-marked chromatin) suppresses METTL3 binding to chromatin by inhibiting its interaction with METTL14, selectively reducing m6A deposition on enhancer and promoter RNAs. PAK2 promotes METTL3 acetylation by phosphorylating METTL3. Mutations at METTL3 acetylation sites selectively promote m6A on H3K27ac-marked chromatin-associated RNAs and repress ferroptosis-inhibition-related genes.","method":"Genome-wide CRISPR-Cas9 screen, in vitro acetylation assay, Co-IP (METTL3-METTL14 interaction), acetylation site mutagenesis, ChIP-seq, m6A-seq, PAK2 kinase assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide screen, in vitro acetylation assay, structural mutagenesis, ChIP-seq and m6A-seq, multiple orthogonal methods identifying PTM writer (p300) and phospho-writer (PAK2)","pmids":["40101711"],"is_preprint":false},{"year":2022,"finding":"METTL3 controls translational upregulation of splicing factor proteins via m6A modification-mediated ribosome recycling and decoding, leading to widespread splicing dysregulation and contributing to CLL progression in a methyltransferase-dependent manner.","method":"Integrative transcriptomic and proteomic analysis, METTL3 KD in CLL cells in vitro and in vivo, ribosome profiling, m6A-seq","journal":"Blood cancer discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic and transcriptomic integration, in vivo KD, methyltransferase-dependence confirmed, single lab","pmids":["37067905"],"is_preprint":false},{"year":2023,"finding":"METTL3-mediated m6A modification of TLR4 mRNA increases TLR4 translation and simultaneously slows its degradation, elevating TLR4 protein levels in neutrophils; this promotes TLR4/MyD88/NF-κB signaling activation and controls CXCR2-dependent neutrophil release from bone marrow.","method":"Neutrophil-specific Mettl3 KO mice, MeRIP-qPCR, TLR4 protein/mRNA stability assay, translation efficiency measurement, flow cytometry, LPS-induced endotoxemia model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO, MeRIP, dual measurement of translation and stability, in vivo endotoxemia model, multiple orthogonal methods","pmids":["36920907"],"is_preprint":false},{"year":2023,"finding":"Mettl3 promotes m6A-mediated degradation of mRNAs encoding critical histone-modifying enzymes in epidermal progenitors; depletion of Mettl3 increases expression of these chromatin modifiers and their associated histone modifications, causing widespread gene expression abnormalities and impaired epithelial development including loss of hair follicle morphogenesis.","method":"Epidermal progenitor-specific Mettl3 KO mice, m6A-seq, histone modification profiling, transcriptome analysis, RNA stability","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO, m6A-seq, histone ChIP, transcriptome, mechanistic chain from m6A → chromatin modifier → gene expression established","pmids":["37656787"],"is_preprint":false},{"year":2023,"finding":"METTL3-mediated m6A methylation in γδ T cells prevents formation of endogenous double-stranded RNAs and promotes degradation of Stat1 transcripts; both mechanisms converge to prevent over-activation of STAT1 signaling and maintain γδ T17 cell identity.","method":"Mettl3 KO in γδ T cells, dsRNA detection assay, Stat1 mRNA decay assay, IL-17 production measurement, psoriasis mouse model","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined molecular and functional readouts, dsRNA detection, two mechanistic pathways identified, single lab","pmids":["37355989"],"is_preprint":false},{"year":2021,"finding":"METTL3 promotes m6A modification of TRAF6 mRNA 3'-UTR in microglia, and METTL3 physically interacts with TRAF6 protein; METTL3 overexpression activates the TRAF6-NF-κB pathway in an m6A-dependent manner to promote LPS-induced microglial inflammation.","method":"Co-immunoprecipitation (METTL3-TRAF6), MeRIP-qPCR for TRAF6 3'-UTR, dot blot for global m6A, siRNA knockdown, NF-κB signaling western blot","journal":"Neuroreport","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP and MeRIP-qPCR, single lab, limited mechanistic follow-up on the direct protein-protein interaction","pmids":["33165191"],"is_preprint":false},{"year":2021,"finding":"METTL3-mediated m6A modification of SNAP29 mRNA destabilizes it, depleting SNAP29 protein; this disrupts autophagic flux (SNARE-dependent autophagosome-lysosome fusion), increases ROS, and promotes parthanatos in ischemic flap cells. YTHDF2 recognizes SNAP29 m6A sites to mediate its degradation.","method":"MeRIP-qPCR, RIP-qPCR, RNA stability assay, METTL3/YTHDF2 knockdown, AAV-SNAP29 rescue, ischemic flap mouse model","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP, RIP, RNA stability, in vivo rescue, multiple orthogonal methods in single lab","pmids":["40340690"],"is_preprint":false},{"year":2024,"finding":"Mettl3 determines pancreatic endocrine lineage fate by targeting Hdac1 mRNA for m6A modification in bipotent progenitors; loss of Hdac1 causes aberrant activation of Wnt/Notch signaling and blocks endocrine differentiation. Pancreatic progenitor-specific Mettl3 KO leads to loss of Ngn3+ endocrine progenitors and increased Sox9+ ductal precursors.","method":"Pdx1-Cre Mettl3 KO mice, m6A profiling, Hdac1 mRNA stability and m6A assay, Wnt/Notch signaling analysis, in vitro embryonic pancreatic culture rescue experiments","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo conditional KO with specific progenitor phenotype, in vitro rescue, identified direct m6A target, single lab","pmids":["37963393"],"is_preprint":false},{"year":2024,"finding":"METTL3-mediated m6A modification of YTHDF2-recognized m6A sites on SLC7A11 mRNA promotes its degradation, thereby inducing ferroptosis in macrophages. This pathway is driven upstream by EP300-mediated H3K18 lactylation binding to the METTL3 promoter in response to lactate accumulation in atherosclerosis.","method":"H3K18la ChIP-qPCR at METTL3 promoter, MeRIP for SLC7A11, YTHDF2 RIP, myeloid-specific Mettl3 KO mice (ApoE−/−), ferroptosis markers","journal":"Biochimica et biophysica acta. General subjects","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, MeRIP, RIP, in vivo myeloid KO, multiple methods in single lab","pmids":["40588140"],"is_preprint":false},{"year":2024,"finding":"METTL3 increases m6A modification on TERRA in ALT+ cancer cells; the m6A-mediated recruitment of hnRNPA2B1 to TERRA is critical for R-loop formation at telomeres. Loss of METTL3 or TERRA m6A reduces R-loops, causes telomere damage and shortening. METTL3 inhibition with a BBB-penetrant inhibitor compromises telomere targeting of TERRA in ALT+ neuroblastoma cells.","method":"m6A-seq of TERRA, hnRNPA2B1 RIP-seq, DRIP (R-loop detection), METTL3 inhibitor (STM2457), telomere damage assay (γH2AX at telomeres), ALT+ neuroblastoma cell lines","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — m6A-seq, DRIP, RIP-seq identifying specific reader, pharmacological inhibition, multiple orthogonal methods confirming METTL3→m6A→hnRNPA2B1→R-loop→telomere maintenance chain","pmids":["38180812"],"is_preprint":false},{"year":2021,"finding":"In Xenopus, Mettl3 knockdown causes anteriorization of neural patterning, loss of neural crest specification, and impaired neuronal differentiation; m6A-dependent mRNA destabilization (via Ythdf1 and mRNA decay factors Lsm1/Tut7) regulates posteriorizing WNT signaling during neurulation.","method":"Mettl3 morpholino knockdown in Xenopus, Ythdf1/Lsm1/Tut7 knockdowns, neural marker in situ hybridization, WNT reporter assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis across multiple components of the m6A pathway with defined developmental phenotypes in Xenopus ortholog model, single lab","pmids":["33972392"],"is_preprint":false},{"year":2023,"finding":"METTL3 promotes m6A modification of pri-miR-148a-3p in prostate cancer cells, facilitating its processing and maturation (consistent with DGCR8-mediated mechanism), thereby upregulating miR-148a-3p levels.","method":"MeRIP assay for pri-miR-148a-3p, METTL3 siRNA knockdown, miRNA qRT-PCR, in vivo xenograft","journal":"Environmental toxicology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single MeRIP experiment, METTL3 KD with miRNA readout, no direct DGCR8 interaction experiment performed, single lab","pmids":["37449729"],"is_preprint":false},{"year":2022,"finding":"METTL3-mediated m6A modification of TRAF6 mRNA enhances its expression in osteosarcoma cells, and TRAF6 upregulation promotes OS metastasis; METTL3 depletion reduces TRAF6 expression and metastatic activity.","method":"Transcriptome sequencing and m6A-seq, RIP, dual-luciferase assay, wound healing/invasion, in vivo tumorigenic assay","journal":"Journal of bone oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, MeRIP and RIP identifying target, functional validation via KD, no in-depth mechanistic dissection of m6A reader involved","pmids":["35145841"],"is_preprint":false},{"year":2022,"finding":"METTL3 promotes m6A modification of CXCL5 mRNA (stabilizing it) and suppresses CCL5 expression in an m6A-dependent manner in bladder cancer cells, leading to increased MDSC recruitment and reduced CD8+ T cell infiltration in the tumor microenvironment.","method":"shRNA silencing of METTL3, RNA-seq, MeRIP-seq, RNA degradation assay, ELISA for chemokines, flow cytometry in orthotopic and ectopic mouse models","journal":"Journal for immunotherapy of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP-seq, RNA stability assay, in vivo mouse models, multiple methods in single lab","pmids":["40234090"],"is_preprint":false},{"year":2023,"finding":"METTL3-mediated m6A modification of BATF mRNA stabilizes it (via IGF2BP2), elevating BATF expression in microglia; BATF directly binds promoters of inflammatory cytokine and chemokine genes to drive pro-inflammatory programs and TNF-dependent neurotoxicity.","method":"MeRIP-seq, IGF2BP2 RIP, CUT&Tag for BATF chromatin binding, selective microglial Mettl3 ablation, cytokine measurement (TBI mouse model)","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — MeRIP-seq, RIP, CUT&Tag, in vivo conditional KO, multiple independent mechanistic experiments in single paper","pmids":["38902548"],"is_preprint":false},{"year":2024,"finding":"METTL3-mediated m6A modification of OTUD1 mRNA promotes its stability and increases OTUD1 protein expression; OTUD1 deubiquitinates PGAM5, robustly activating the Ask1-p38/JNK signaling pathway to drive pathological cardiac hypertrophy.","method":"RIP for METTL3-OTUD1 interaction, RNA stability assay, cardiac-specific Otud1 KO/OE mice, TAC model, IP-mass spectrometry for OTUD1 substrates, deubiquitinase activity assay","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP, RNA stability, in vivo cardiac KO, IP-MS for substrate identification, multiple methods, single lab","pmids":["39309432"],"is_preprint":false},{"year":2024,"finding":"METTL3-mediated m6A modification of FOSL1 mRNA increases FOSL1 expression in an IGF2BP2-dependent manner in trophoblast cells; elevated FOSL1 suppresses trophoblast invasion and migration, contributing to fetal growth restriction. Pharmacological METTL3 inhibition (STM2457) restores trophoblast function and fetal weight in vivo.","method":"MeRIP-seq and RNA-seq of METTL3-KD trophoblasts, IGF2BP2 RIP, RNA stability assay, METTL3 OE in HTR8/SVneo, STM2457 treatment in FGR mouse model","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP-seq, RIP, RNA stability, pharmacological in vivo validation, multiple orthogonal methods, single lab","pmids":["39565355"],"is_preprint":false},{"year":2023,"finding":"METTL3-mediated m6A modification of SIRT1 mRNA is recognized by YTHDF2, inducing SIRT1 mRNA degradation; reduced SIRT1 inhibits FOXO3a signaling, promotes cellular senescence, and impairs ectopic endometrial stromal cell implantation. In vivo, Mettl3 conditional KO enhances SIRT1 and suppresses endometriosis.","method":"MeRIP-seq, RIP-qPCR, RNA stability assay, YTHDF2 RIP, PgrCre/Mettl3−/− mice and nude mouse xenograft model, senescence SA-β-gal assay","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP-seq, YTHDF2 RIP, in vivo KO, multiple methods, single lab","pmids":["37353804"],"is_preprint":false},{"year":2024,"finding":"METTL3-mediated m6A modification increases HSPA9 mRNA stability and translation efficiency in cervical cancer cells; exosomally secreted mortalin (HSPA9) blocks p53 nuclear transport, preventing p53-Gadd45A interaction and inactivating p53 to suppress senescence and promote malignant transformation.","method":"MeRIP (m6A sites in HSPA9 3'UTR), RNA stability assay, translation efficiency assay, exosome isolation, p53 nuclear fractionation, co-IP for p53-Gadd45A interaction, in vivo xenograft","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP, RNA stability, translation assay, functional exosome experiments, single lab with multiple methods","pmids":["38253218"],"is_preprint":false},{"year":2022,"finding":"METTL3-mediated m6A modification of TIMP2 mRNA in podocytes increases TIMP2 stability in an IGF2BP2-dependent manner, activating Notch signaling and promoting podocyte inflammation and apoptosis in diabetic nephropathy. Podocyte-conditional Mettl3 KO reduces podocyte injury and albuminuria in diabetic mice.","method":"MeRIP-qPCR, IGF2BP2 RIP, RNA stability assay, podocyte-specific Mettl3 KO mice (STZ model, db/db), AAV9-shMETTL3 therapeutic silencing","journal":"Molecular therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP, RIP, in vivo conditional KO, AAV therapeutic validation, multiple methods, single lab","pmids":["34995800"],"is_preprint":false},{"year":2023,"finding":"METTL3 promotes m6A modification of LATS1 mRNA, which is recognized by YTHDF2 to reduce LATS1 mRNA stability, suppressing Hippo pathway activity and activating YAP/TAZ to promote breast cancer tumorigenesis and glycolysis.","method":"MeRIP-seq, RNA-seq, metabolomics-seq, RNA pulldown, RIP-qPCR, MeRIP-qPCR, RNA stability analysis, METTL3/YTHDF2 KO with YAP/TAZ localization assay","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple integrated omics plus RIP, RNA stability, functional rescue, single lab","pmids":["36609396"],"is_preprint":false},{"year":2023,"finding":"METTL3 promotes m6A modification of EGR1 mRNA; IGF2BP2 binds to the m6A modification site, enhancing EGR1 mRNA stability and increasing EGR1 protein levels, which suppresses the JAK2/STAT3 pathway, disrupts mitophagy and mitochondrial dynamics, and exacerbates myocardial I/R injury.","method":"MeRIP-qPCR, IGF2BP2 RIP, EGR1 mRNA stability assay, H/R cardiomyocyte model, I/R mouse model, JAK2/STAT3 signaling western blot","journal":"Cell biology and toxicology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — MeRIP-qPCR and RIP, single lab, limited mechanistic depth at reader-target junction","pmids":["39707117"],"is_preprint":false},{"year":2022,"finding":"METTL3 promotes m6A modification on TRAF6 mRNA in cardiomyocytes/microglia of the PVN, increasing TRAF6 expression; METTL3 inhibition prevents TRAF6 translocation to mitochondria and blocks the TRAF6/ECSIT pathway, reducing mitochondrial ROS and sympathetic hyperactivity post-myocardial infarction.","method":"MeRIP for TRAF6 in PVN microglia, TRAF6 mitochondrial fractionation, METTL3 inhibitor in vivo, RSNA/NE measurement, programmed electrical stimulation","journal":"Free radical biology & medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — MeRIP and mitochondrial fractionation, pharmacological inhibitor, single lab, limited direct mechanistic validation at m6A reader level","pmids":["37898386"],"is_preprint":false},{"year":2023,"finding":"METTL3-mediated m6A modification of STAT1 transcripts promotes their degradation in γδ T cells, preventing over-activation of STAT1 signaling; additionally, METTL3 prevents formation of immunostimulatory endogenous double-stranded RNAs.","method":"Mettl3-KO in γδ T cells, Stat1 mRNA decay assay, dsRNA detection (J2 antibody), STAT1 protein/mRNA measurement, IL-17 ELISA","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific KO, mRNA decay assay, dsRNA detection, two mechanistic mechanisms identified, single lab","pmids":["37355989"],"is_preprint":false},{"year":2023,"finding":"METTL3-mediated m6A modification of PINK1 mRNA promotes its degradation in a YTHDF2-dependent manner in renal tubular cells, impairing PINK1-Parkin mitophagy and exacerbating diabetic nephropathy.","method":"MeRIP-qPCR for PINK1 m6A, RIP for YTHDF2-PINK1, METTL3 siRNA, PINK1 mRNA stability assay, mitophagy markers (LC3, p62), in vivo DKD model","journal":"Journal of diabetes investigation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single MeRIP-qPCR, RIP, single lab, limited direct demonstration of YTHDF2-dependent degradation mechanism","pmids":["38013600"],"is_preprint":false},{"year":2024,"finding":"METTL3 promotes m6A modification on SNAIL mRNA in colorectal cancer cells; YTHDF1 reads this m6A to promote SNAIL translation, which activates NF-κB to increase CXCL2 secretion, recruiting M2 macrophages to facilitate pulmonary metastasis.","method":"MeRIP-qPCR for SNAIL, RIP for YTHDF1-SNAIL, RNA stability assay, luciferase reporter for NF-κB, ELISA for CXCL2, macrophage co-culture, in vivo metastasis model","journal":"Journal of experimental & clinical cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — MeRIP and RIP, luciferase reporter, single lab with limited direct proof of m6A reader-translation coupling","pmids":["38605400"],"is_preprint":false},{"year":2024,"finding":"METTL3-mediated m6A modification of ACVR2A mRNA represses its synthesis in skeletal muscle, blunting activin/myostatin anti-hypertrophic signaling; this represents a m6A-dependent post-transcriptional mechanism controlling muscle size. (Supporting the finding in PMID 35013323 with additional mechanistic detail.)","method":"m6A-seq, METTL3 conditional KO, ACVR2A protein measurement, myostatin inhibitor rescue, AAV-METTL3 delivery","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO, genome-wide m6A-seq, specific downstream target identified, genetic rescue, multiple orthogonal methods","pmids":["35013323"],"is_preprint":false}],"current_model":"METTL3 is the dominant catalytic subunit of the m6A methyltransferase complex, responsible for >95% of N6-methyladenosine deposition on mRNA and non-coding RNAs; it forms a complex with METTL14 and WTAP, and its activity is regulated post-translationally by SUMOylation (suppressive, via SUMO1/SENP1), K48-ubiquitination (degradative, via TRIP12), p300-mediated acetylation (suppressive on chromatin-associated RNA methylation), PAK2-mediated phosphorylation (promotes acetylation), and lactylation of its zinc-finger domain (required for RNA capture). Depending on the target mRNA and cellular context, METTL3-deposited m6A can stabilize transcripts (via IGF2BP1/2/3 readers), destabilize them (via YTHDF2), promote translation (via YTHDF1 or direct ribosome association independent of catalytic activity), regulate alternative splicing (via YTHDC1), or facilitate processing of non-coding RNAs including miRNA precursors and TERRA lncRNA; through these mechanisms METTL3 controls diverse processes including immune cell activation, skeletal muscle hypertrophy, neural patterning, cerebellar development, genome stability (R-loop resolution via ARID1A-METTL3-RNase H1 axis), telomere maintenance (TERRA m6A→hnRNPA2B1→R-loops), autophagy, cellular senescence, and tissue homeostasis."},"narrative":{"mechanistic_narrative":"METTL3 is the dominant catalytic subunit of the cellular N6-methyladenosine (m6A) methyltransferase machinery, accounting for the great majority of m6A on mRNA as established by exon 4 deletion combined with LC-MS/MS quantification, which also revealed that apparent METTL3-independent m6A traces to catalytically active splice isoforms [PMID:35853000]. Acting with METTL14 and WTAP, METTL3 deposits m6A whose functional outcome is determined by the reader engaged: transcript stabilization through IGF2BP2 (e.g., Tcf7, TAB3, TIMP2, BATF, MIS12) [PMID:33637761, PMID:35417191, PMID:34995800, PMID:38902548, PMID:33035345], transcript destabilization through YTHDF2 (e.g., SNAP29, SIRT1, LATS1, SLC7A11) [PMID:40340690, PMID:37353804, PMID:36609396, PMID:40588140], and translational enhancement through YTHDF1 or YTHDC1-dependent processing [PMID:31015515, PMID:36399511]. Through these mRNA-fate programs METTL3 controls cell-type-specific transcripts to regulate immune cell activation and inflammation [PMID:31015515, PMID:36920907, PMID:37355989], skeletal muscle hypertrophy via repression of ACVR2A and the activin/myostatin axis [PMID:35013323], cerebellar, neural, and pancreatic-lineage development [PMID:29879109, PMID:33972392, PMID:37963393], epithelial morphogenesis by tuning histone-modifier mRNAs [PMID:37656787], autophagy, ferroptosis and cellular senescence [PMID:30870073, PMID:34706873, PMID:37353804], and genome stability — promoting R-loop resolution at DNA breaks through an ARID1A–METTL3/METTL14–RNase H1 axis [PMID:38358891] and conversely supporting telomere maintenance in ALT cancer cells by m6A-marking TERRA for YTHDC1 stabilization and hnRNPA2B1-driven R-loop formation [PMID:36399511, PMID:38180812]. Notably, METTL3 also acts independently of its catalytic activity, associating with ribosomes and the translation initiation machinery to promote translation of bound mRNAs, since catalytically inactive METTL3 retains this activity when tethered [PMID:27117702]. METTL3 activity is tightly controlled post-translationally: SUMOylation by SUMO1 (reversed by SENP1) represses methyltransferase activity [PMID:29506078], TRIP12-mediated K48 polyubiquitination drives its degradation [PMID:38902548], lactylation of its zinc-finger domain is required for target RNA capture [PMID:35320754], and p300-mediated acetylation — promoted by PAK2 phosphorylation — blocks METTL3–METTL14 interaction to selectively limit m6A on chromatin-associated enhancer/promoter RNAs [PMID:40101711].","teleology":[{"year":2016,"claim":"Established that METTL3 has a methyltransferase-independent function, acting directly in translation rather than solely as an m6A writer.","evidence":"Ribosome association assays and tethering of wild-type versus catalytically dead METTL3 to reporter mRNAs in cell lines","pmids":["27117702"],"confidence":"High","gaps":["Did not define which initiation factors are essential","Did not establish how this catalysis-independent role is partitioned from the writer complex in vivo"]},{"year":2018,"claim":"Resolved how METTL3 activity is dampened post-translationally, showing SUMOylation represses catalytic output without altering complex assembly or stability.","evidence":"Site-directed 4KR mutagenesis, in vivo SUMOylation assay, SENP1 reversal, and m6A quantification with METTL14/WTAP co-IP","pmids":["29506078"],"confidence":"High","gaps":["Did not identify the SUMO E3 ligase","Mechanism by which SUMO blocks catalysis on the assembled complex unresolved"]},{"year":2018,"claim":"Demonstrated in vivo that METTL3-deposited m6A controls mRNA stability and splicing to drive a defined developmental program (cerebellar granule cell survival).","evidence":"Nervous-system conditional Mettl3 knockout mouse with transcriptome-wide m6A mapping, RNA half-life and splicing analysis","pmids":["29879109"],"confidence":"High","gaps":["Specific reader proteins mediating the stability/splicing effects not pinpointed","Direct causative target transcripts in granule cells not isolated"]},{"year":2019,"claim":"Showed that m6A outcome is reader- and target-specific, including translational enhancement of immune effectors and autophagy regulation through distinct readers.","evidence":"DC-specific Mettl3 KO with RIP and translation reporters (CD40/CD80/Tirap); m6A-RIP and HNRNPD pulldown on TFEB","pmids":["31015515","30870073"],"confidence":"High","gaps":["How a single writer selects opposing stabilizing versus destabilizing reader outcomes per target is unresolved","TFEB feedback loop kinetics not fully characterized"]},{"year":2021,"claim":"Mapped how METTL3 tunes lineage-specifying and signaling transcripts across diverse tissues via stabilization or destabilization of distinct targets.","evidence":"Cell-type-specific KOs and morpholino knockdown with miCLIP/m6A mapping, decay assays, and genetic rescue (Tcf7 in TFH; WNT in Xenopus neural patterning; SNAP29/ATG7 in autophagy)","pmids":["33637761","33972392","40340690","34706873"],"confidence":"Medium","gaps":["Cross-tissue rules governing target selection remain undefined","Some autophagy targets supported by single-lab studies"]},{"year":2022,"claim":"Rigorously quantified METTL3's contribution to the m6A epitranscriptome, attributing >95% of mRNA m6A to METTL3 and explaining prior discrepancies via active splice isoforms.","evidence":"CRISPR/Cas9 exon 4 deletion, splice-isoform functional assays, and LC-MS/MS m6A quantification","pmids":["35853000"],"confidence":"High","gaps":["Did not address the residual <5% writer activity","Tissue-specific isoform contributions not surveyed"]},{"year":2022,"claim":"Extended METTL3 function to non-coding RNA and genome integrity, identifying TERRA m6A and YTHDC1-dependent stabilization as required for telomere maintenance in ALT cells.","evidence":"MeRIP, YTHDC1 RIP, DRIP R-loop detection, and telomere length assays in ALT cancer cells","pmids":["36399511"],"confidence":"High","gaps":["How TERRA m6A is selectively deposited versus mRNA targets is unknown","Reader handoff between YTHDC1 and downstream R-loop machinery not detailed at this stage"]},{"year":2022,"claim":"Identified lactate metabolism as an upstream regulator of METTL3, both transcriptionally (H3K18 lactylation at the promoter) and post-translationally via zinc-finger lactylation required for RNA capture.","evidence":"MeRIP-seq, mass spectrometry of lactylation sites, zinc-finger mutagenesis, and myeloid-specific Mettl3 KO with JAK1/STAT3 readouts","pmids":["35320754"],"confidence":"High","gaps":["The lactyltransferase/delactylase for the zinc-finger sites not fully defined","Quantitative impact of lactylation on bulk m6A unresolved"]},{"year":2024,"claim":"Defined METTL3's direct role in DNA double-strand break repair as part of an ordered ARID1A-recruited complex that methylates R-loop RNA to enable RNase H1 resolution and end resection.","evidence":"Reciprocal co-IP, ChIP, in vitro R-loop binding, MeRIP, RNase H1 recruitment and DNA end-resection/comet assays with ARID1A/METTL3/METTL14 depletion","pmids":["38358891"],"confidence":"High","gaps":["Whether m6A on R-loop RNA is read by a specific reader to recruit RNase H1 not established","Relationship to the telomeric TERRA R-loop pathway not reconciled"]},{"year":2024,"claim":"Resolved how METTL3 protein abundance and chromatin engagement are controlled, identifying TRIP12-mediated K48 degradation and a PAK2→p300 acetylation switch that restricts chromatin-associated m6A.","evidence":"K48-linkage ubiquitination assays, genome-wide CRISPR screen, in vitro acetylation and PAK2 kinase assays, acetylation-site mutagenesis with ChIP-seq/m6A-seq","pmids":["38902548","40101711"],"confidence":"High","gaps":["Interplay among SUMOylation, ubiquitination, lactylation and acetylation in a single cell not integrated","Deacetylase/deubiquitinase counterparts not all identified"]},{"year":null,"claim":"It remains unresolved how a single writer complex achieves target- and reader-specific outcomes (stabilization vs decay vs translation) and how the network of competing post-translational modifications is coordinated to direct METTL3 to specific RNA classes in a given cell state.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying code linking site selection to reader recruitment","PTM cross-talk hierarchy not reconstituted","Structural basis for chromatin vs cytoplasmic targeting undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[11,1,2,6]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[11,1,17]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,5,6]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[0,18,3]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[0,18]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[17,14]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[11,2,6]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,19,21]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[14,26]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,16,17,5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,27,24,20]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[4,13,23]}],"complexes":["m6A methyltransferase writer complex (METTL3-METTL14-WTAP)"],"partners":["METTL14","WTAP","TRIP12","ARID1A","P300","PAK2","SENP1","TRAF6"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q86U44","full_name":"N(6)-adenosine-methyltransferase catalytic subunit METTL3","aliases":["Methyltransferase-like protein 3","hMETTL3","N(6)-adenosine-methyltransferase 70 kDa subunit","MT-A70"],"length_aa":580,"mass_kda":64.5,"function":"The METTL3-METTL14 heterodimer forms a N6-methyltransferase complex that methylates adenosine residues at the N(6) position of some RNAs and regulates various processes such as the circadian clock, differentiation of embryonic and hematopoietic stem cells, cortical neurogenesis, response to DNA damage, differentiation of T-cells and primary miRNA processing (PubMed:22575960, PubMed:24284625, PubMed:25719671, PubMed:25799998, PubMed:26321680, PubMed:26593424, PubMed:27281194, PubMed:27373337, PubMed:27627798, PubMed:28297716, PubMed:29348140, PubMed:29506078, PubMed:30428350, PubMed:9409616). In the heterodimer formed with METTL14, METTL3 constitutes the catalytic core (PubMed:27281194, PubMed:27373337, PubMed:27627798). N6-methyladenosine (m6A), which takes place at the 5'-[AG]GAC-3' consensus sites of some mRNAs, plays a role in mRNA stability, processing, translation efficiency and editing (PubMed:22575960, PubMed:24284625, PubMed:25719671, PubMed:25799998, PubMed:26321680, PubMed:26593424, PubMed:28297716, PubMed:9409616). M6A acts as a key regulator of mRNA stability: methylation is completed upon the release of mRNA into the nucleoplasm and promotes mRNA destabilization and degradation (PubMed:28637692). In embryonic stem cells (ESCs), m6A methylation of mRNAs encoding key naive pluripotency-promoting transcripts results in transcript destabilization, promoting differentiation of ESCs (By similarity). M6A regulates the length of the circadian clock: acts as an early pace-setter in the circadian loop by putting mRNA production on a fast-track for facilitating nuclear processing, thereby providing an early point of control in setting the dynamics of the feedback loop (By similarity). M6A also regulates circadian regulation of hepatic lipid metabolism (PubMed:30428350). M6A regulates spermatogonial differentiation and meiosis and is essential for male fertility and spermatogenesis (By similarity). Also required for oogenesis (By similarity). Involved in the response to DNA damage: in response to ultraviolet irradiation, METTL3 rapidly catalyzes the formation of m6A on poly(A) transcripts at DNA damage sites, leading to the recruitment of POLK to DNA damage sites (PubMed:28297716). M6A is also required for T-cell homeostasis and differentiation: m6A methylation of transcripts of SOCS family members (SOCS1, SOCS3 and CISH) in naive T-cells promotes mRNA destabilization and degradation, promoting T-cell differentiation (By similarity). Inhibits the type I interferon response by mediating m6A methylation of IFNB (PubMed:30559377). M6A also takes place in other RNA molecules, such as primary miRNA (pri-miRNAs) (PubMed:25799998). Mediates m6A methylation of Xist RNA, thereby participating in random X inactivation: m6A methylation of Xist leads to target YTHDC1 reader on Xist and promote transcription repression activity of Xist (PubMed:27602518). M6A also regulates cortical neurogenesis: m6A methylation of transcripts related to transcription factors, neural stem cells, the cell cycle and neuronal differentiation during brain development promotes their destabilization and decay, promoting differentiation of radial glial cells (By similarity). METTL3 mediates methylation of pri-miRNAs, marking them for recognition and processing by DGCR8 (PubMed:25799998). Acts as a positive regulator of mRNA translation independently of the methyltransferase activity: promotes translation by interacting with the translation initiation machinery in the cytoplasm (PubMed:27117702). Its overexpression in a number of cancer cells suggests that it may participate in cancer cell proliferation by promoting mRNA translation (PubMed:27117702). During human coronavirus SARS-CoV-2 infection, adds m6A modifications in SARS-CoV-2 RNA leading to decreased RIGI binding and subsequently dampening the sensing and activation of innate immune responses (PubMed:33961823)","subcellular_location":"Nucleus; Nucleus speckle; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q86U44/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/METTL3","classification":"Common Essential","n_dependent_lines":982,"n_total_lines":1208,"dependency_fraction":0.8129139072847682},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"POLR2B","stoichiometry":10.0},{"gene":"RNF40","stoichiometry":4.0},{"gene":"TOP1","stoichiometry":4.0},{"gene":"CPSF6","stoichiometry":0.2},{"gene":"INPPL1","stoichiometry":0.2},{"gene":"PTGES3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/METTL3","total_profiled":1310},"omim":[{"mim_id":"619296","title":"TESTIS-ASSOCIATED ONCOGENIC LONG NONCODING RNA; THORLNC","url":"https://www.omim.org/entry/619296"},{"mim_id":"617283","title":"YTH DOMAIN-CONTAINING PROTEIN 1; YTHDC1","url":"https://www.omim.org/entry/617283"},{"mim_id":"616529","title":"YTH N6-METHYLADENOSINE RNA-BINDING PROTEIN 1; YTHDF1","url":"https://www.omim.org/entry/616529"},{"mim_id":"616504","title":"METHYLTRANSFERASE 14, N6-ADENOSINE-METHYLTRANSFERASE SUBUNIT; METTL14","url":"https://www.omim.org/entry/616504"},{"mim_id":"616447","title":"VIR-LIKE M6A METHYLTRANSFERASE-ASSOCIATED PROTEIN; VIRMA","url":"https://www.omim.org/entry/616447"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Nuclear bodies","reliability":"Additional"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/METTL3"},"hgnc":{"alias_symbol":["Spo8","M6A","MT-A70"],"prev_symbol":[]},"alphafold":{"accession":"Q86U44","domains":[{"cath_id":"1.10.10.10","chopping":"76-158","consensus_level":"high","plddt":80.3651,"start":76,"end":158},{"cath_id":"-","chopping":"274-333","consensus_level":"high","plddt":85.3772,"start":274,"end":333},{"cath_id":"3.40.50.150","chopping":"371-567","consensus_level":"high","plddt":95.0287,"start":371,"end":567}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86U44","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86U44-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86U44-F1-predicted_aligned_error_v6.png","plddt_mean":75.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=METTL3","jax_strain_url":"https://www.jax.org/strain/search?query=METTL3"},"sequence":{"accession":"Q86U44","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86U44.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86U44/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86U44"}},"corpus_meta":[{"pmid":"27117702","id":"PMC_27117702","title":"The m(6)A Methyltransferase METTL3 Promotes Translation in Human Cancer Cells.","date":"2016","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/27117702","citation_count":1276,"is_preprint":false},{"pmid":"35320754","id":"PMC_35320754","title":"Lactylation-driven METTL3-mediated RNA m6A modification promotes immunosuppression of tumor-infiltrating myeloid cells.","date":"2022","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/35320754","citation_count":660,"is_preprint":false},{"pmid":"31015515","id":"PMC_31015515","title":"Mettl3-mediated mRNA m6A methylation promotes dendritic cell activation.","date":"2019","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/31015515","citation_count":438,"is_preprint":false},{"pmid":"30870073","id":"PMC_30870073","title":"METTL3 and ALKBH5 oppositely regulate m6A modification of TFEB mRNA, which dictates the fate of hypoxia/reoxygenation-treated cardiomyocytes.","date":"2019","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/30870073","citation_count":418,"is_preprint":false},{"pmid":"34706873","id":"PMC_34706873","title":"METTL3-mediated m6A modification of ATG7 regulates autophagy-GATA4 axis to promote cellular senescence and osteoarthritis progression.","date":"2021","source":"Annals of the rheumatic diseases","url":"https://pubmed.ncbi.nlm.nih.gov/34706873","citation_count":320,"is_preprint":false},{"pmid":"29506078","id":"PMC_29506078","title":"SUMOylation of the m6A-RNA methyltransferase METTL3 modulates its function.","date":"2018","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/29506078","citation_count":277,"is_preprint":false},{"pmid":"35417191","id":"PMC_35417191","title":"Inhibition of METTL3 attenuates renal injury and inflammation by alleviating TAB3 m6A modifications via IGF2BP2-dependent mechanisms.","date":"2022","source":"Science translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35417191","citation_count":262,"is_preprint":false},{"pmid":"29879109","id":"PMC_29879109","title":"METTL3-mediated m6A modification is required for cerebellar development.","date":"2018","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/29879109","citation_count":237,"is_preprint":false},{"pmid":"38852200","id":"PMC_38852200","title":"Histone lactylation-regulated METTL3 promotes ferroptosis via m6A-modification on ACSL4 in sepsis-associated lung injury.","date":"2024","source":"Redox biology","url":"https://pubmed.ncbi.nlm.nih.gov/38852200","citation_count":225,"is_preprint":false},{"pmid":"35273176","id":"PMC_35273176","title":"Fusobacterium nucleatum reduces METTL3-mediated m6A modification and contributes to colorectal cancer metastasis.","date":"2022","source":"Nature 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Modification of ZHX2 Promotes Tumor Property of Renal Cell Carcinoma.","date":"2024","source":"Kidney & blood pressure research","url":"https://pubmed.ncbi.nlm.nih.gov/39159608","citation_count":9,"is_preprint":false},{"pmid":"36445237","id":"PMC_36445237","title":"m6A methyltransferase METTL3 inhibits endometriosis by regulating alternative splicing of MIR17HG.","date":"2023","source":"Reproduction (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/36445237","citation_count":9,"is_preprint":false},{"pmid":"39633280","id":"PMC_39633280","title":"Exercise promotes skeletal muscle growth in adolescents via modulating Mettl3-mediated m6A methylation of MyoD in muscle satellite cells.","date":"2024","source":"Cellular & molecular biology letters","url":"https://pubmed.ncbi.nlm.nih.gov/39633280","citation_count":9,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":58355,"output_tokens":11792,"usd":0.175973,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":22606,"output_tokens":4227,"usd":0.109353,"stage2_stop_reason":"end_turn"},"total_usd":0.285326,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2016,\n      \"finding\": \"METTL3 associates with ribosomes in the cytoplasm and promotes translation of specific mRNAs (e.g., EGFR, TAZ) through interaction with the translation initiation machinery. Both wild-type and catalytically inactive METTL3 promote translation when tethered to a reporter mRNA, indicating a methyltransferase-independent translational role.\",\n      \"method\": \"Ribosome association assay, tethering reporter assay, loss- and gain-of-function studies, co-immunoprecipitation with translation initiation factors\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional assays including catalytic-dead mutant tethering, ribosome fractionation, and loss/gain-of-function studies in multiple cell lines\",\n      \"pmids\": [\"27117702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"METTL3 is SUMOylated at lysine residues K177, K211, K212, and K215 by SUMO1; this modification is reversed by SENP1. SUMOylation does not alter METTL3 stability, localization, or interaction with METTL14 and WTAP, but significantly represses its m6A methyltransferase activity, reducing m6A levels in mRNAs.\",\n      \"method\": \"Site-directed mutagenesis (4KR mutant), in vivo SUMOylation assay, m6A quantification, co-immunoprecipitation with METTL14/WTAP, colony formation assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of SUMOylation sites with functional rescue, orthogonal enzymatic activity assay, single lab with multiple methods\",\n      \"pmids\": [\"29506078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Conditional knockout of Mettl3 in mouse nervous system causes cerebellar hypoplasia due to enhanced apoptosis of cerebellar granule cells; METTL3 depletion leads to extended RNA half-lives and aberrant splicing events, demonstrating that METTL3-mediated m6A regulates mRNA stability and splicing in cerebellar development.\",\n      \"method\": \"Conditional knockout mouse (cKO), transcriptome-wide m6A mapping, RNA half-life measurement, splicing analysis, histology\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean in vivo conditional KO with defined cellular phenotype, transcriptome-wide m6A and RNA stability measurements, single lab\",\n      \"pmids\": [\"29879109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mettl3-mediated m6A modification of CD40, CD80, and TLR4 signaling adaptor Tirap mRNAs enhances their translation in dendritic cells, promoting DC maturation, NF-κB signaling, and IL-12 cytokine production.\",\n      \"method\": \"DC-specific Mettl3 conditional knockout, RNA immunoprecipitation, translation reporter assay, co-stimulatory molecule expression analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific KO with defined molecular targets and functional immune readouts, multiple orthogonal methods\",\n      \"pmids\": [\"31015515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"METTL3 methylates TFEB mRNA at two m6A residues in the 3'-UTR, promoting association of HNRNPD with TFEB pre-mRNA and decreasing TFEB expression levels, thereby negatively regulating autophagy. TFEB in turn inhibits METTL3 mRNA stability (post-transcriptionally) and induces ALKBH5, establishing a negative feedback loop.\",\n      \"method\": \"m6A-RIP, RNA immunoprecipitation (RIP), siRNA knockdown, overexpression, autophagic flux assay, GST pull-down\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (MeRIP, RIP, RNA stability) identifying specific m6A sites and downstream reader, single lab\",\n      \"pmids\": [\"30870073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Lactate in the tumor microenvironment induces METTL3 upregulation via H3K18 lactylation at the METTL3 promoter. METTL3 is also directly lactylated at two sites in its zinc-finger domain, which is required for target RNA capture. METTL3-mediated m6A on Jak1 mRNA is recognized by YTHDF1, enhancing JAK1 protein translation and STAT3 phosphorylation in tumor-infiltrating myeloid cells.\",\n      \"method\": \"MeRIP-seq, RIP, mass spectrometry identification of lactylation sites, site-directed mutagenesis of zinc-finger domain, JAK1 translation reporter, phospho-STAT3 western blot, myeloid-specific Mettl3 KO mice\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mass spectrometry identification of PTM sites, mutagenesis, in vivo KO, multiple orthogonal mechanistic experiments\",\n      \"pmids\": [\"35320754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 catalyzes m6A modification on TERRA (telomeric repeat-containing RNA); the m6A-modified TERRA is recognized and stabilized by the reader YTHDC1. Loss of METTL3 or YTHDC1 enhances TERRA degradation, reduces R-loop formation at telomeres, and leads to telomere shortening and instability in ALT cancer cells.\",\n      \"method\": \"MeRIP, YTHDC1 RIP, R-loop detection (DRIP), METTL3 knockdown/knockout, telomere length assay, TERRA stability assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (MeRIP, DRIP, telomere length), replicated across multiple experimental approaches in single study, defined molecular mechanism\",\n      \"pmids\": [\"36399511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3-mediated m6A modification of TAB3 mRNA at stop codon regions increases TAB3 mRNA stability through binding of the reader IGF2BP2, leading to NF-κB-dependent renal inflammation. Genetic and pharmacological (Cpd-564) METTL3 inhibition attenuates renal injury.\",\n      \"method\": \"MeRIP-seq, RNA-seq, RIP-qPCR, conditional Mettl3 KO mice, AAV9-mediated silencing, pharmacological inhibitor\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MeRIP-seq target identification, in vivo conditional KO, pharmacological validation, multiple orthogonal methods\",\n      \"pmids\": [\"35417191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL3-mediated m6A modification of the Tcf7 3'-UTR stabilizes Tcf7 mRNA in T follicular helper cells; loss of METTL3 or mutation of the Tcf7 m6A site accelerates Tcf7 transcript decay and impairs TFH differentiation. Ectopic TCF-1 expression rescues TFH defects caused by METTL3 deficiency.\",\n      \"method\": \"CD4+ T cell-specific Mettl3 conditional KO, m6A-miCLIP-seq, RNA decay assay, site-directed m6A site mutation, rescue experiment with TCF-1 overexpression\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO, transcriptome-wide m6A mapping (miCLIP-seq), site mutagenesis, genetic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"33637761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"METTL3 reduces m6A modification on MIS12 mRNA in human mesenchymal stem cells; loss of m6A accelerates MIS12 mRNA turnover, reducing MIS12 expression and promoting cellular senescence. The m6A reader IGF2BP2 recognizes and stabilizes m6A-modified MIS12 mRNA.\",\n      \"method\": \"m6A transcriptional profiling, METTL3 KO/overexpression in hMSCs, RNA stability assay, IGF2BP2 RIP, senescence assays (SA-β-gal, p21)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (m6A profiling, RIP, RNA stability) in human stem cell model, single lab\",\n      \"pmids\": [\"33035345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL3 depletion decreases m6A levels in SARS-CoV-2 RNA; m6A reduction in viral RNA increases RIG-I binding and enhances downstream innate immune signaling and inflammatory gene expression, revealing that METTL3-deposited m6A on viral RNA dampens innate immune sensing.\",\n      \"method\": \"m6A-seq of SARS-CoV-2 genome, METTL3 siRNA depletion, RIG-I RIP, innate immune gene expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m6A-seq and RIG-I RIP linking m6A status to immune sensor binding, single lab, two orthogonal approaches\",\n      \"pmids\": [\"33961823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 is responsible for >95% of m6A in mRNA as demonstrated by exon 4 deletion of Mettl3; apparent METTL3-independent m6A in prior studies was due to expression of alternatively spliced METTL3 isoforms that bypass CRISPR/Cas9 mutations and retain methyltransferase activity.\",\n      \"method\": \"CRISPR/Cas9 exon 4 deletion, alternative splicing analysis, m6A quantification by LC-MS/MS, functional activity assay of splice isoforms\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — rigorous genetic deletion with exon 4 approach, LC-MS/MS m6A quantification, mechanistic explanation of prior discrepancies with functional characterization of isoforms\",\n      \"pmids\": [\"35853000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 promotes skeletal muscle hypertrophy by repressing m6A-dependent synthesis of activin type 2A receptor (ACVR2A), blunting anti-hypertrophic myostatin signaling. Myofiber-specific conditional Mettl3 deletion causes spontaneous muscle wasting; exogenous METTL3 delivery induces muscle growth even without external triggers.\",\n      \"method\": \"Myofiber-specific conditional Mettl3 KO mice, overload-induced hypertrophy model, m6A-seq of muscle, AAV-mediated METTL3 delivery, myostatin inhibitor co-administration rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO with defined phenotype, genome-wide m6A profiling, specific downstream target (ACVR2A) identified, genetic rescue with myostatin inhibitor\",\n      \"pmids\": [\"35013323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL3-mediated m6A modification of ATG7 mRNA attenuates ATG7 RNA stability, impairing autophagosome formation and promoting cellular senescence via the GATA4 axis in fibroblast-like synoviocytes.\",\n      \"method\": \"m6A-methylated RNA immunoprecipitation, RNA immunoprecipitation, siRNA knockdown, autophagic flux assay, intra-articular AAV9-siMETTL3 injection in DMM mouse model\",\n      \"journal\": \"Annals of the rheumatic diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP and RIP identifying specific target mRNA, in vivo validation with AAV, single lab\",\n      \"pmids\": [\"34706873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ARID1A recognizes R-loops in an ATM-dependent manner and recruits METTL3 and METTL14 to R-loop RNA, leading to m6A methylation of R-loop RNA. This m6A modification facilitates recruitment of RNase H1 to drive R-loop resolution and promote DNA end resection at double-strand breaks, ensuring genome stability.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, in vitro R-loop binding assay, MeRIP, RNase H1 recruitment assay, DNA end resection assay, METTL3/METTL14/ARID1A depletion with comet assay and cell survival\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying ordered complex, functional MeRIP, RNase H1 recruitment, DNA repair readout, multiple orthogonal methods\",\n      \"pmids\": [\"38358891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Lactate promotes p300-mediated H3K18 lactylation at the METTL3 promoter, increasing METTL3 expression. METTL3-mediated m6A modification is enriched in ACSL4 mRNA and its stability is regulated through a YTHDC1-dependent pathway, promoting ferroptosis in alveolar epithelial cells during sepsis-associated lung injury.\",\n      \"method\": \"H3K18la ChIP at METTL3 promoter, MeRIP for ACSL4, YTHDC1 RIP, METTL3 knockdown/inhibitor in ALI mouse model\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, MeRIP, RIP with functional ferroptosis readout, multiple methods in single lab\",\n      \"pmids\": [\"38852200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIP12, a HECT-domain E3 ubiquitin ligase, acts as a negative regulator of METTL3 protein expression by facilitating K48-linked polyubiquitination of METTL3 in inflammatory microglia; METTL3 protein is upregulated in TBI not through transcription but through reduced proteasomal degradation. METTL3 stabilizes BATF mRNA in an m6A-IGF2BP2-dependent manner to drive neuroinflammation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay (K48-linkage specific), MeRIP-seq, CUT&Tag, IGF2BP2 RIP, selective microglial Mettl3 ablation in TBI mouse model\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — K48-ubiquitin linkage assay identifies specific E3 ligase, MeRIP-seq, IGF2BP2 RIP, in vivo conditional KO with functional recovery readout, multiple orthogonal methods\",\n      \"pmids\": [\"38902548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"p300-mediated acetylation of METTL3 (occurring specifically on H3K27ac-marked chromatin) suppresses METTL3 binding to chromatin by inhibiting its interaction with METTL14, selectively reducing m6A deposition on enhancer and promoter RNAs. PAK2 promotes METTL3 acetylation by phosphorylating METTL3. Mutations at METTL3 acetylation sites selectively promote m6A on H3K27ac-marked chromatin-associated RNAs and repress ferroptosis-inhibition-related genes.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen, in vitro acetylation assay, Co-IP (METTL3-METTL14 interaction), acetylation site mutagenesis, ChIP-seq, m6A-seq, PAK2 kinase assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide screen, in vitro acetylation assay, structural mutagenesis, ChIP-seq and m6A-seq, multiple orthogonal methods identifying PTM writer (p300) and phospho-writer (PAK2)\",\n      \"pmids\": [\"40101711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 controls translational upregulation of splicing factor proteins via m6A modification-mediated ribosome recycling and decoding, leading to widespread splicing dysregulation and contributing to CLL progression in a methyltransferase-dependent manner.\",\n      \"method\": \"Integrative transcriptomic and proteomic analysis, METTL3 KD in CLL cells in vitro and in vivo, ribosome profiling, m6A-seq\",\n      \"journal\": \"Blood cancer discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic and transcriptomic integration, in vivo KD, methyltransferase-dependence confirmed, single lab\",\n      \"pmids\": [\"37067905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL3-mediated m6A modification of TLR4 mRNA increases TLR4 translation and simultaneously slows its degradation, elevating TLR4 protein levels in neutrophils; this promotes TLR4/MyD88/NF-κB signaling activation and controls CXCR2-dependent neutrophil release from bone marrow.\",\n      \"method\": \"Neutrophil-specific Mettl3 KO mice, MeRIP-qPCR, TLR4 protein/mRNA stability assay, translation efficiency measurement, flow cytometry, LPS-induced endotoxemia model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO, MeRIP, dual measurement of translation and stability, in vivo endotoxemia model, multiple orthogonal methods\",\n      \"pmids\": [\"36920907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Mettl3 promotes m6A-mediated degradation of mRNAs encoding critical histone-modifying enzymes in epidermal progenitors; depletion of Mettl3 increases expression of these chromatin modifiers and their associated histone modifications, causing widespread gene expression abnormalities and impaired epithelial development including loss of hair follicle morphogenesis.\",\n      \"method\": \"Epidermal progenitor-specific Mettl3 KO mice, m6A-seq, histone modification profiling, transcriptome analysis, RNA stability\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO, m6A-seq, histone ChIP, transcriptome, mechanistic chain from m6A → chromatin modifier → gene expression established\",\n      \"pmids\": [\"37656787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL3-mediated m6A methylation in γδ T cells prevents formation of endogenous double-stranded RNAs and promotes degradation of Stat1 transcripts; both mechanisms converge to prevent over-activation of STAT1 signaling and maintain γδ T17 cell identity.\",\n      \"method\": \"Mettl3 KO in γδ T cells, dsRNA detection assay, Stat1 mRNA decay assay, IL-17 production measurement, psoriasis mouse model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined molecular and functional readouts, dsRNA detection, two mechanistic pathways identified, single lab\",\n      \"pmids\": [\"37355989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL3 promotes m6A modification of TRAF6 mRNA 3'-UTR in microglia, and METTL3 physically interacts with TRAF6 protein; METTL3 overexpression activates the TRAF6-NF-κB pathway in an m6A-dependent manner to promote LPS-induced microglial inflammation.\",\n      \"method\": \"Co-immunoprecipitation (METTL3-TRAF6), MeRIP-qPCR for TRAF6 3'-UTR, dot blot for global m6A, siRNA knockdown, NF-κB signaling western blot\",\n      \"journal\": \"Neuroreport\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP and MeRIP-qPCR, single lab, limited mechanistic follow-up on the direct protein-protein interaction\",\n      \"pmids\": [\"33165191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL3-mediated m6A modification of SNAP29 mRNA destabilizes it, depleting SNAP29 protein; this disrupts autophagic flux (SNARE-dependent autophagosome-lysosome fusion), increases ROS, and promotes parthanatos in ischemic flap cells. YTHDF2 recognizes SNAP29 m6A sites to mediate its degradation.\",\n      \"method\": \"MeRIP-qPCR, RIP-qPCR, RNA stability assay, METTL3/YTHDF2 knockdown, AAV-SNAP29 rescue, ischemic flap mouse model\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP, RIP, RNA stability, in vivo rescue, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"40340690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Mettl3 determines pancreatic endocrine lineage fate by targeting Hdac1 mRNA for m6A modification in bipotent progenitors; loss of Hdac1 causes aberrant activation of Wnt/Notch signaling and blocks endocrine differentiation. Pancreatic progenitor-specific Mettl3 KO leads to loss of Ngn3+ endocrine progenitors and increased Sox9+ ductal precursors.\",\n      \"method\": \"Pdx1-Cre Mettl3 KO mice, m6A profiling, Hdac1 mRNA stability and m6A assay, Wnt/Notch signaling analysis, in vitro embryonic pancreatic culture rescue experiments\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo conditional KO with specific progenitor phenotype, in vitro rescue, identified direct m6A target, single lab\",\n      \"pmids\": [\"37963393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"METTL3-mediated m6A modification of YTHDF2-recognized m6A sites on SLC7A11 mRNA promotes its degradation, thereby inducing ferroptosis in macrophages. This pathway is driven upstream by EP300-mediated H3K18 lactylation binding to the METTL3 promoter in response to lactate accumulation in atherosclerosis.\",\n      \"method\": \"H3K18la ChIP-qPCR at METTL3 promoter, MeRIP for SLC7A11, YTHDF2 RIP, myeloid-specific Mettl3 KO mice (ApoE−/−), ferroptosis markers\",\n      \"journal\": \"Biochimica et biophysica acta. General subjects\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, MeRIP, RIP, in vivo myeloid KO, multiple methods in single lab\",\n      \"pmids\": [\"40588140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"METTL3 increases m6A modification on TERRA in ALT+ cancer cells; the m6A-mediated recruitment of hnRNPA2B1 to TERRA is critical for R-loop formation at telomeres. Loss of METTL3 or TERRA m6A reduces R-loops, causes telomere damage and shortening. METTL3 inhibition with a BBB-penetrant inhibitor compromises telomere targeting of TERRA in ALT+ neuroblastoma cells.\",\n      \"method\": \"m6A-seq of TERRA, hnRNPA2B1 RIP-seq, DRIP (R-loop detection), METTL3 inhibitor (STM2457), telomere damage assay (γH2AX at telomeres), ALT+ neuroblastoma cell lines\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — m6A-seq, DRIP, RIP-seq identifying specific reader, pharmacological inhibition, multiple orthogonal methods confirming METTL3→m6A→hnRNPA2B1→R-loop→telomere maintenance chain\",\n      \"pmids\": [\"38180812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Xenopus, Mettl3 knockdown causes anteriorization of neural patterning, loss of neural crest specification, and impaired neuronal differentiation; m6A-dependent mRNA destabilization (via Ythdf1 and mRNA decay factors Lsm1/Tut7) regulates posteriorizing WNT signaling during neurulation.\",\n      \"method\": \"Mettl3 morpholino knockdown in Xenopus, Ythdf1/Lsm1/Tut7 knockdowns, neural marker in situ hybridization, WNT reporter assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis across multiple components of the m6A pathway with defined developmental phenotypes in Xenopus ortholog model, single lab\",\n      \"pmids\": [\"33972392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL3 promotes m6A modification of pri-miR-148a-3p in prostate cancer cells, facilitating its processing and maturation (consistent with DGCR8-mediated mechanism), thereby upregulating miR-148a-3p levels.\",\n      \"method\": \"MeRIP assay for pri-miR-148a-3p, METTL3 siRNA knockdown, miRNA qRT-PCR, in vivo xenograft\",\n      \"journal\": \"Environmental toxicology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single MeRIP experiment, METTL3 KD with miRNA readout, no direct DGCR8 interaction experiment performed, single lab\",\n      \"pmids\": [\"37449729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3-mediated m6A modification of TRAF6 mRNA enhances its expression in osteosarcoma cells, and TRAF6 upregulation promotes OS metastasis; METTL3 depletion reduces TRAF6 expression and metastatic activity.\",\n      \"method\": \"Transcriptome sequencing and m6A-seq, RIP, dual-luciferase assay, wound healing/invasion, in vivo tumorigenic assay\",\n      \"journal\": \"Journal of bone oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, MeRIP and RIP identifying target, functional validation via KD, no in-depth mechanistic dissection of m6A reader involved\",\n      \"pmids\": [\"35145841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 promotes m6A modification of CXCL5 mRNA (stabilizing it) and suppresses CCL5 expression in an m6A-dependent manner in bladder cancer cells, leading to increased MDSC recruitment and reduced CD8+ T cell infiltration in the tumor microenvironment.\",\n      \"method\": \"shRNA silencing of METTL3, RNA-seq, MeRIP-seq, RNA degradation assay, ELISA for chemokines, flow cytometry in orthotopic and ectopic mouse models\",\n      \"journal\": \"Journal for immunotherapy of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP-seq, RNA stability assay, in vivo mouse models, multiple methods in single lab\",\n      \"pmids\": [\"40234090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL3-mediated m6A modification of BATF mRNA stabilizes it (via IGF2BP2), elevating BATF expression in microglia; BATF directly binds promoters of inflammatory cytokine and chemokine genes to drive pro-inflammatory programs and TNF-dependent neurotoxicity.\",\n      \"method\": \"MeRIP-seq, IGF2BP2 RIP, CUT&Tag for BATF chromatin binding, selective microglial Mettl3 ablation, cytokine measurement (TBI mouse model)\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MeRIP-seq, RIP, CUT&Tag, in vivo conditional KO, multiple independent mechanistic experiments in single paper\",\n      \"pmids\": [\"38902548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"METTL3-mediated m6A modification of OTUD1 mRNA promotes its stability and increases OTUD1 protein expression; OTUD1 deubiquitinates PGAM5, robustly activating the Ask1-p38/JNK signaling pathway to drive pathological cardiac hypertrophy.\",\n      \"method\": \"RIP for METTL3-OTUD1 interaction, RNA stability assay, cardiac-specific Otud1 KO/OE mice, TAC model, IP-mass spectrometry for OTUD1 substrates, deubiquitinase activity assay\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP, RNA stability, in vivo cardiac KO, IP-MS for substrate identification, multiple methods, single lab\",\n      \"pmids\": [\"39309432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"METTL3-mediated m6A modification of FOSL1 mRNA increases FOSL1 expression in an IGF2BP2-dependent manner in trophoblast cells; elevated FOSL1 suppresses trophoblast invasion and migration, contributing to fetal growth restriction. Pharmacological METTL3 inhibition (STM2457) restores trophoblast function and fetal weight in vivo.\",\n      \"method\": \"MeRIP-seq and RNA-seq of METTL3-KD trophoblasts, IGF2BP2 RIP, RNA stability assay, METTL3 OE in HTR8/SVneo, STM2457 treatment in FGR mouse model\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP-seq, RIP, RNA stability, pharmacological in vivo validation, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"39565355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL3-mediated m6A modification of SIRT1 mRNA is recognized by YTHDF2, inducing SIRT1 mRNA degradation; reduced SIRT1 inhibits FOXO3a signaling, promotes cellular senescence, and impairs ectopic endometrial stromal cell implantation. In vivo, Mettl3 conditional KO enhances SIRT1 and suppresses endometriosis.\",\n      \"method\": \"MeRIP-seq, RIP-qPCR, RNA stability assay, YTHDF2 RIP, PgrCre/Mettl3−/− mice and nude mouse xenograft model, senescence SA-β-gal assay\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP-seq, YTHDF2 RIP, in vivo KO, multiple methods, single lab\",\n      \"pmids\": [\"37353804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"METTL3-mediated m6A modification increases HSPA9 mRNA stability and translation efficiency in cervical cancer cells; exosomally secreted mortalin (HSPA9) blocks p53 nuclear transport, preventing p53-Gadd45A interaction and inactivating p53 to suppress senescence and promote malignant transformation.\",\n      \"method\": \"MeRIP (m6A sites in HSPA9 3'UTR), RNA stability assay, translation efficiency assay, exosome isolation, p53 nuclear fractionation, co-IP for p53-Gadd45A interaction, in vivo xenograft\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP, RNA stability, translation assay, functional exosome experiments, single lab with multiple methods\",\n      \"pmids\": [\"38253218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3-mediated m6A modification of TIMP2 mRNA in podocytes increases TIMP2 stability in an IGF2BP2-dependent manner, activating Notch signaling and promoting podocyte inflammation and apoptosis in diabetic nephropathy. Podocyte-conditional Mettl3 KO reduces podocyte injury and albuminuria in diabetic mice.\",\n      \"method\": \"MeRIP-qPCR, IGF2BP2 RIP, RNA stability assay, podocyte-specific Mettl3 KO mice (STZ model, db/db), AAV9-shMETTL3 therapeutic silencing\",\n      \"journal\": \"Molecular therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP, RIP, in vivo conditional KO, AAV therapeutic validation, multiple methods, single lab\",\n      \"pmids\": [\"34995800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL3 promotes m6A modification of LATS1 mRNA, which is recognized by YTHDF2 to reduce LATS1 mRNA stability, suppressing Hippo pathway activity and activating YAP/TAZ to promote breast cancer tumorigenesis and glycolysis.\",\n      \"method\": \"MeRIP-seq, RNA-seq, metabolomics-seq, RNA pulldown, RIP-qPCR, MeRIP-qPCR, RNA stability analysis, METTL3/YTHDF2 KO with YAP/TAZ localization assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple integrated omics plus RIP, RNA stability, functional rescue, single lab\",\n      \"pmids\": [\"36609396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL3 promotes m6A modification of EGR1 mRNA; IGF2BP2 binds to the m6A modification site, enhancing EGR1 mRNA stability and increasing EGR1 protein levels, which suppresses the JAK2/STAT3 pathway, disrupts mitophagy and mitochondrial dynamics, and exacerbates myocardial I/R injury.\",\n      \"method\": \"MeRIP-qPCR, IGF2BP2 RIP, EGR1 mRNA stability assay, H/R cardiomyocyte model, I/R mouse model, JAK2/STAT3 signaling western blot\",\n      \"journal\": \"Cell biology and toxicology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — MeRIP-qPCR and RIP, single lab, limited mechanistic depth at reader-target junction\",\n      \"pmids\": [\"39707117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 promotes m6A modification on TRAF6 mRNA in cardiomyocytes/microglia of the PVN, increasing TRAF6 expression; METTL3 inhibition prevents TRAF6 translocation to mitochondria and blocks the TRAF6/ECSIT pathway, reducing mitochondrial ROS and sympathetic hyperactivity post-myocardial infarction.\",\n      \"method\": \"MeRIP for TRAF6 in PVN microglia, TRAF6 mitochondrial fractionation, METTL3 inhibitor in vivo, RSNA/NE measurement, programmed electrical stimulation\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — MeRIP and mitochondrial fractionation, pharmacological inhibitor, single lab, limited direct mechanistic validation at m6A reader level\",\n      \"pmids\": [\"37898386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL3-mediated m6A modification of STAT1 transcripts promotes their degradation in γδ T cells, preventing over-activation of STAT1 signaling; additionally, METTL3 prevents formation of immunostimulatory endogenous double-stranded RNAs.\",\n      \"method\": \"Mettl3-KO in γδ T cells, Stat1 mRNA decay assay, dsRNA detection (J2 antibody), STAT1 protein/mRNA measurement, IL-17 ELISA\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific KO, mRNA decay assay, dsRNA detection, two mechanistic mechanisms identified, single lab\",\n      \"pmids\": [\"37355989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL3-mediated m6A modification of PINK1 mRNA promotes its degradation in a YTHDF2-dependent manner in renal tubular cells, impairing PINK1-Parkin mitophagy and exacerbating diabetic nephropathy.\",\n      \"method\": \"MeRIP-qPCR for PINK1 m6A, RIP for YTHDF2-PINK1, METTL3 siRNA, PINK1 mRNA stability assay, mitophagy markers (LC3, p62), in vivo DKD model\",\n      \"journal\": \"Journal of diabetes investigation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single MeRIP-qPCR, RIP, single lab, limited direct demonstration of YTHDF2-dependent degradation mechanism\",\n      \"pmids\": [\"38013600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"METTL3 promotes m6A modification on SNAIL mRNA in colorectal cancer cells; YTHDF1 reads this m6A to promote SNAIL translation, which activates NF-κB to increase CXCL2 secretion, recruiting M2 macrophages to facilitate pulmonary metastasis.\",\n      \"method\": \"MeRIP-qPCR for SNAIL, RIP for YTHDF1-SNAIL, RNA stability assay, luciferase reporter for NF-κB, ELISA for CXCL2, macrophage co-culture, in vivo metastasis model\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — MeRIP and RIP, luciferase reporter, single lab with limited direct proof of m6A reader-translation coupling\",\n      \"pmids\": [\"38605400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"METTL3-mediated m6A modification of ACVR2A mRNA represses its synthesis in skeletal muscle, blunting activin/myostatin anti-hypertrophic signaling; this represents a m6A-dependent post-transcriptional mechanism controlling muscle size. (Supporting the finding in PMID 35013323 with additional mechanistic detail.)\",\n      \"method\": \"m6A-seq, METTL3 conditional KO, ACVR2A protein measurement, myostatin inhibitor rescue, AAV-METTL3 delivery\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO, genome-wide m6A-seq, specific downstream target identified, genetic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"35013323\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"METTL3 is the dominant catalytic subunit of the m6A methyltransferase complex, responsible for >95% of N6-methyladenosine deposition on mRNA and non-coding RNAs; it forms a complex with METTL14 and WTAP, and its activity is regulated post-translationally by SUMOylation (suppressive, via SUMO1/SENP1), K48-ubiquitination (degradative, via TRIP12), p300-mediated acetylation (suppressive on chromatin-associated RNA methylation), PAK2-mediated phosphorylation (promotes acetylation), and lactylation of its zinc-finger domain (required for RNA capture). Depending on the target mRNA and cellular context, METTL3-deposited m6A can stabilize transcripts (via IGF2BP1/2/3 readers), destabilize them (via YTHDF2), promote translation (via YTHDF1 or direct ribosome association independent of catalytic activity), regulate alternative splicing (via YTHDC1), or facilitate processing of non-coding RNAs including miRNA precursors and TERRA lncRNA; through these mechanisms METTL3 controls diverse processes including immune cell activation, skeletal muscle hypertrophy, neural patterning, cerebellar development, genome stability (R-loop resolution via ARID1A-METTL3-RNase H1 axis), telomere maintenance (TERRA m6A→hnRNPA2B1→R-loops), autophagy, cellular senescence, and tissue homeostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"METTL3 is the dominant catalytic subunit of the cellular N6-methyladenosine (m6A) methyltransferase machinery, accounting for the great majority of m6A on mRNA as established by exon 4 deletion combined with LC-MS/MS quantification, which also revealed that apparent METTL3-independent m6A traces to catalytically active splice isoforms [#11]. Acting with METTL14 and WTAP, METTL3 deposits m6A whose functional outcome is determined by the reader engaged: transcript stabilization through IGF2BP2 (e.g., Tcf7, TAB3, TIMP2, BATF, MIS12) [#8, #7, #36, #31, #9], transcript destabilization through YTHDF2 (e.g., SNAP29, SIRT1, LATS1, SLC7A11) [#23, #34, #37, #25], and translational enhancement through YTHDF1 or YTHDC1-dependent processing [#3, #6]. Through these mRNA-fate programs METTL3 controls cell-type-specific transcripts to regulate immune cell activation and inflammation [#3, #19, #21], skeletal muscle hypertrophy via repression of ACVR2A and the activin/myostatin axis [#12, #43], cerebellar, neural, and pancreatic-lineage development [#2, #27, #24], epithelial morphogenesis by tuning histone-modifier mRNAs [#20], autophagy, ferroptosis and cellular senescence [#4, #13, #34], and genome stability — promoting R-loop resolution at DNA breaks through an ARID1A–METTL3/METTL14–RNase H1 axis [#14] and conversely supporting telomere maintenance in ALT cancer cells by m6A-marking TERRA for YTHDC1 stabilization and hnRNPA2B1-driven R-loop formation [#6, #26]. Notably, METTL3 also acts independently of its catalytic activity, associating with ribosomes and the translation initiation machinery to promote translation of bound mRNAs, since catalytically inactive METTL3 retains this activity when tethered [#0]. METTL3 activity is tightly controlled post-translationally: SUMOylation by SUMO1 (reversed by SENP1) represses methyltransferase activity [#1], TRIP12-mediated K48 polyubiquitination drives its degradation [#16], lactylation of its zinc-finger domain is required for target RNA capture [#5], and p300-mediated acetylation — promoted by PAK2 phosphorylation — blocks METTL3–METTL14 interaction to selectively limit m6A on chromatin-associated enhancer/promoter RNAs [#17].\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Established that METTL3 has a methyltransferase-independent function, acting directly in translation rather than solely as an m6A writer.\",\n      \"evidence\": \"Ribosome association assays and tethering of wild-type versus catalytically dead METTL3 to reporter mRNAs in cell lines\",\n      \"pmids\": [\"27117702\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define which initiation factors are essential\", \"Did not establish how this catalysis-independent role is partitioned from the writer complex in vivo\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved how METTL3 activity is dampened post-translationally, showing SUMOylation represses catalytic output without altering complex assembly or stability.\",\n      \"evidence\": \"Site-directed 4KR mutagenesis, in vivo SUMOylation assay, SENP1 reversal, and m6A quantification with METTL14/WTAP co-IP\",\n      \"pmids\": [\"29506078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the SUMO E3 ligase\", \"Mechanism by which SUMO blocks catalysis on the assembled complex unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated in vivo that METTL3-deposited m6A controls mRNA stability and splicing to drive a defined developmental program (cerebellar granule cell survival).\",\n      \"evidence\": \"Nervous-system conditional Mettl3 knockout mouse with transcriptome-wide m6A mapping, RNA half-life and splicing analysis\",\n      \"pmids\": [\"29879109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific reader proteins mediating the stability/splicing effects not pinpointed\", \"Direct causative target transcripts in granule cells not isolated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed that m6A outcome is reader- and target-specific, including translational enhancement of immune effectors and autophagy regulation through distinct readers.\",\n      \"evidence\": \"DC-specific Mettl3 KO with RIP and translation reporters (CD40/CD80/Tirap); m6A-RIP and HNRNPD pulldown on TFEB\",\n      \"pmids\": [\"31015515\", \"30870073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single writer selects opposing stabilizing versus destabilizing reader outcomes per target is unresolved\", \"TFEB feedback loop kinetics not fully characterized\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mapped how METTL3 tunes lineage-specifying and signaling transcripts across diverse tissues via stabilization or destabilization of distinct targets.\",\n      \"evidence\": \"Cell-type-specific KOs and morpholino knockdown with miCLIP/m6A mapping, decay assays, and genetic rescue (Tcf7 in TFH; WNT in Xenopus neural patterning; SNAP29/ATG7 in autophagy)\",\n      \"pmids\": [\"33637761\", \"33972392\", \"40340690\", \"34706873\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cross-tissue rules governing target selection remain undefined\", \"Some autophagy targets supported by single-lab studies\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Rigorously quantified METTL3's contribution to the m6A epitranscriptome, attributing >95% of mRNA m6A to METTL3 and explaining prior discrepancies via active splice isoforms.\",\n      \"evidence\": \"CRISPR/Cas9 exon 4 deletion, splice-isoform functional assays, and LC-MS/MS m6A quantification\",\n      \"pmids\": [\"35853000\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address the residual <5% writer activity\", \"Tissue-specific isoform contributions not surveyed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended METTL3 function to non-coding RNA and genome integrity, identifying TERRA m6A and YTHDC1-dependent stabilization as required for telomere maintenance in ALT cells.\",\n      \"evidence\": \"MeRIP, YTHDC1 RIP, DRIP R-loop detection, and telomere length assays in ALT cancer cells\",\n      \"pmids\": [\"36399511\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TERRA m6A is selectively deposited versus mRNA targets is unknown\", \"Reader handoff between YTHDC1 and downstream R-loop machinery not detailed at this stage\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified lactate metabolism as an upstream regulator of METTL3, both transcriptionally (H3K18 lactylation at the promoter) and post-translationally via zinc-finger lactylation required for RNA capture.\",\n      \"evidence\": \"MeRIP-seq, mass spectrometry of lactylation sites, zinc-finger mutagenesis, and myeloid-specific Mettl3 KO with JAK1/STAT3 readouts\",\n      \"pmids\": [\"35320754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The lactyltransferase/delactylase for the zinc-finger sites not fully defined\", \"Quantitative impact of lactylation on bulk m6A unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined METTL3's direct role in DNA double-strand break repair as part of an ordered ARID1A-recruited complex that methylates R-loop RNA to enable RNase H1 resolution and end resection.\",\n      \"evidence\": \"Reciprocal co-IP, ChIP, in vitro R-loop binding, MeRIP, RNase H1 recruitment and DNA end-resection/comet assays with ARID1A/METTL3/METTL14 depletion\",\n      \"pmids\": [\"38358891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether m6A on R-loop RNA is read by a specific reader to recruit RNase H1 not established\", \"Relationship to the telomeric TERRA R-loop pathway not reconciled\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved how METTL3 protein abundance and chromatin engagement are controlled, identifying TRIP12-mediated K48 degradation and a PAK2→p300 acetylation switch that restricts chromatin-associated m6A.\",\n      \"evidence\": \"K48-linkage ubiquitination assays, genome-wide CRISPR screen, in vitro acetylation and PAK2 kinase assays, acetylation-site mutagenesis with ChIP-seq/m6A-seq\",\n      \"pmids\": [\"38902548\", \"40101711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay among SUMOylation, ubiquitination, lactylation and acetylation in a single cell not integrated\", \"Deacetylase/deubiquitinase counterparts not all identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single writer complex achieves target- and reader-specific outcomes (stabilization vs decay vs translation) and how the network of competing post-translational modifications is coordinated to direct METTL3 to specific RNA classes in a given cell state.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying code linking site selection to reader recruitment\", \"PTM cross-talk hierarchy not reconstituted\", \"Structural basis for chromatin vs cytoplasmic targeting undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [11, 1, 2, 6]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [11, 1, 17]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [0, 18, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [0, 18]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [17, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [11, 2, 6]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 19, 21]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [14, 26]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 16, 17, 5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 27, 24, 20]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [4, 13, 23]}\n    ],\n    \"complexes\": [\"m6A methyltransferase writer complex (METTL3-METTL14-WTAP)\"],\n    \"partners\": [\"METTL14\", \"WTAP\", \"TRIP12\", \"ARID1A\", \"p300\", \"PAK2\", \"SENP1\", \"TRAF6\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}