{"gene":"METTL14","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":2013,"finding":"METTL14 catalyzes N6-methyladenosine (m6A) RNA methylation and forms a stable heterodimer core complex with METTL3 that functions in cellular m6A deposition on mammalian nuclear RNAs; WTAP interacts with this complex and affects methylation.","method":"Biochemical characterization, Co-IP, in vitro methylation assay","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1-2 — original discovery paper with >2700 citations, multiple orthogonal methods, replicated extensively","pmids":["24316715"],"is_preprint":false},{"year":2016,"finding":"Crystal structures of METTL3-METTL14 heterodimer reveal that METTL3 is the catalytic core (AdoMet binds only to METTL3 pocket), while METTL14 serves as an RNA-binding platform with a positively charged groove; combined biochemical analysis confirms this division of labor.","method":"X-ray crystallography (1.6-1.9 Å resolution), biochemical assays, ligand-binding studies","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — crystal structures in three states plus functional biochemistry, ~980 citations","pmids":["27281194"],"is_preprint":false},{"year":2018,"finding":"The C-terminal RGG repeats of METTL14 are required for METTL3/METTL14 methyltransferase activity by contributing to RNA substrate binding; monomeric METTL3 is soluble but inactive, and METTL14 alone has a degenerated catalytic center and is also inactive. Nuclear localization signals were identified and endogenous phosphorylation sites were mapped on both proteins.","method":"In vitro methylation assay with recombinant proteins, binding surface mapping, mutagenesis, mass spectrometry phosphoproteomics","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis and multiple orthogonal methods","pmids":["29348140"],"is_preprint":false},{"year":2021,"finding":"METTL14 binds H3K27me3 and recruits KDM6B to induce H3K27me3 demethylation independently of METTL3 and independently of m6A methyltransferase activity, regulating heterochromatin and the transition from self-renewal to differentiation in mouse embryonic stem cells.","method":"ChIP-seq, KO mESCs, co-IP, functional differentiation assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal chromatin methods plus genetic KO, m6A-independent function validated by enzymatic mutants","pmids":["33795874"],"is_preprint":false},{"year":2021,"finding":"PRMT1 interacts with METTL14 and methylates it at arginine 255 (R255me), which greatly enhances interaction of METTL3/METTL14 with WTAP and promotes binding of the complex to substrate RNA, thereby increasing global mRNA m6A modification and driving endoderm differentiation in mESCs.","method":"Mass spectrometry, reciprocal Co-IP, in vitro methylation, METTL14 R255K mutant mESCs, MeRIP-seq","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — MS identification plus mutagenesis, in vitro reconstitution, and cellular genetic model","pmids":["34145242"],"is_preprint":false},{"year":2021,"finding":"HRD1 E3 ligase mediates ubiquitination and degradation of METTL14 under basal ER conditions; accumulation of unfolded/misfolded proteins during ER stress competes with HRD1-ERAD to block METTL14 ubiquitination, stabilizing METTL14 which then promotes m6A-dependent decay of CHOP mRNA (via its 3'UTR m6A) to suppress pro-apoptotic signaling.","method":"Co-IP, ubiquitination assay, liver-specific KO mice, MeRIP-seq, mutagenesis of m6A sites, luciferase reporter","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal biochemical and genetic approaches in vitro and in vivo","pmids":["34847358"],"is_preprint":false},{"year":2023,"finding":"STUB1 E3 ligase directly interacts with METTL14 and mediates its ubiquitination at lysines K148, K156, and K162, leading to proteasomal degradation and decreased global m6A; METTL3 competes with STUB1 for METTL14 binding (via METTL3 residues 450-454 and 464-480), thereby protecting METTL14 from degradation and maintaining m6A homeostasis.","method":"Co-IP, ubiquitination assay, mutagenesis, METTL3 deletion constructs, dot blot","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, mutagenesis, and multiple biochemical validations","pmids":["36597993"],"is_preprint":false},{"year":2023,"finding":"METTL14 specifically binds bivalent chromatin domains (H3K27me3/H3K4me3) and recruits PRC2 (H3K27 methyltransferase) and KDM5B (H3K4 demethylase) to chromatin, independently of METTL3 or m6A, to enhance H3K27me3 and reduce H3K4me3, thereby maintaining bivalent domain integrity in mESCs.","method":"ChIP-seq, METTL14 KO mESCs, Co-IP with PRC2 and KDM5B, nascent RNA assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple chromatin and interaction assays, m6A-independent function confirmed","pmids":["37314930"],"is_preprint":false},{"year":2023,"finding":"METTL14 binds H3K27me3 and recruits KDM6B to demethylate H3K27me3 independently of its RNA methyltransferase activity; depletion of METTL14 causes global H3K27me3 increase and gene suppression, establishing a chromatin regulatory role distinct from METTL3.","method":"ChIP-seq, KO mESCs, Co-IP, enzymatic mutant rescue experiments","journal":"Protein & cell","confidence":"High","confidence_rationale":"Tier 2 — independent paper confirming m6A-independent chromatin function with multiple orthogonal methods","pmids":["37030005"],"is_preprint":false},{"year":2022,"finding":"METTL14 RGG repeats bind RNA G-quadruplex (rG4) structures, and the METTL3/METTL14 heterodimer selectively methylates adenosines close to rG4 sequences, suggesting direct recruitment of the m6A writer complex to specific methylation sites near G4-forming regions.","method":"Electrophoretic mobility shift assay, in vitro methylation assay, deletion/mutation analysis of RGG repeats","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro binding and activity assays, single lab","pmids":["34908152"],"is_preprint":false},{"year":2021,"finding":"METTL3-METTL14 complex is active in vitro on double-stranded DNA containing UV-induced cyclopyrimidine dimers, abasic sites, or mismatches, producing N6-methyladenine (N6mA) in DNA; N6mA in the template strand inhibits its excision by the adenine DNA glycosylase MYH, suggesting a mechanism for reducing inappropriate misrepair at DNA lesion sites.","method":"In vitro methylation assay on DNA substrates, structural analysis of YTHDC1 with gapped DNA duplex","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro reconstitution with defined substrates, single study","pmids":["34086966"],"is_preprint":false},{"year":2022,"finding":"RNA binding to METTL3-METTL14 restricts N6-deoxyadenosine methylation of DNA in vitro; the complex preferentially catalyzes m6dA in single-stranded DNA despite weaker DNA binding, while it binds structured RNAs with high affinity but methylates them less efficiently than ssDNA.","method":"Systematic in vitro methylation activity assays and binding affinity measurements with various DNA/RNA substrates","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 1 — systematic in vitro biochemistry, single lab","pmids":["35060905"],"is_preprint":false},{"year":2021,"finding":"METTL14 promotes global genome repair (GGR) through m6A-mediated translation of DDB2 mRNA; UVB irradiation degrades METTL14 via NBR1-dependent selective autophagy; overexpression of enzymatically active (but not inactive mutant) METTL14 restores GGR and DDB2 levels; YTHDF1 (m6A reader) also binds DDB2 transcript and promotes its translation.","method":"KD/OE with enzymatic mutant, autophagy assay, GGR assay, Co-IP/RIP, mouse skin KO model","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including enzymatic mutant rescue, in vivo mouse model, and reader identification","pmids":["34452996"],"is_preprint":false},{"year":2017,"finding":"METTL14 regulates MYB and MYC mRNA targets through m6A modification to exert its oncogenic role in AML; the protein is negatively regulated at the transcriptional level by SPI1, defining a SPI1-METTL14-MYB/MYC signaling axis in myelopoiesis.","method":"Silencing/overexpression in AML cells and mouse models, MeRIP-seq, RNA stability assays, ChIP for SPI1","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 — in vivo mouse models plus MeRIP-seq and epistasis experiments, high citations","pmids":["29290617"],"is_preprint":false},{"year":2021,"finding":"METTL14 increases m6A modification of FOXO1 mRNA and enhances its translation through YTHDF1 recognition; METTL14 also directly binds to FOXO1 protein and acts on the promoters of VCAM-1 and ICAM-1 to promote their transcription, mediating endothelial cell inflammatory response and atherosclerotic plaque formation.","method":"RIP assay, MeRIP-seq, METTL14 KO mice, Co-IP, luciferase reporter","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vivo KO plus multiple binding assays, single lab","pmids":["32802173"],"is_preprint":false},{"year":2022,"finding":"METTL14 increases m6A modification of Myd88 mRNA to stabilize it, activating the MyD88/NF-κB/IL-6 pathway in macrophages; Myd88 then affects p65 nuclear distribution to regulate IL-6 transcription, promoting macrophage inflammation and atherosclerosis.","method":"MeRIP, RIP, mRNA stability assay, Mettl14 KO mice, NF-κB reporter","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vivo KO plus MeRIP and mRNA stability assays, single lab","pmids":["35598196"],"is_preprint":false},{"year":2021,"finding":"Macrophage-specific Mettl14 knockout decreases m6A on Ebi3 mRNA and increases EBI3 (cytokine subunit) transcript levels, driving CD8+ T cell dysfunction; neutralization of EBI3 reinvigorates dysfunctional CD8+ T cells, placing METTL14-mediated m6A upstream of EBI3 in tumor immune suppression.","method":"Macrophage-specific KO mice, MeRIP, mRNA stability, EBI3 neutralization, T cell functional assays","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 — conditional KO plus multiple orthogonal mechanistic assays","pmids":["34019807"],"is_preprint":false},{"year":2021,"finding":"Viral EBV oncoprotein EBNA3C activates transcription of METTL14 and directly interacts with METTL14 to promote its protein stability, thereby hijacking METTL14-mediated m6A modification of viral latent transcripts to drive EBV-associated tumorigenesis.","method":"Co-IP, Co-immunofluorescence, knockdown, xenograft tumor models","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP plus in vivo xenograft, single lab","pmids":["31226160"],"is_preprint":false},{"year":2020,"finding":"METTL14 regulates m6A modification of pri-miR-19a, enhancing its processing to mature miR-19a through recognition by the microprocessor component DGCR8 in a METTL14-dependent manner, thereby promoting proliferation and invasion of atherosclerotic vascular endothelial cells.","method":"Co-IP (METTL14-DGCR8), RIP, RT-qPCR, KD/OE experiments","journal":"European review for medical and pharmacological sciences","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP and RIP with functional KD/OE, single lab","pmids":["32633395"],"is_preprint":false},{"year":2021,"finding":"PRMT1 methylates METTL14 at two major arginine residues at its C-terminus; the reader protein SPF30 recognizes this asymmetric dimethylarginine modification; arginine methylation of METTL14 is required for its function in catalyzing m6A modification.","method":"Co-IP, in vitro methylation, PRMT1 inhibitor treatment, mass spectrometry","journal":"Neoplasia (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2-3 — biochemical and cell-based assays, single lab","pmids":["37269817"],"is_preprint":false},{"year":2023,"finding":"PRMT3 interacts with METTL14 and mediates its arginine methylation; PRMT3 inhibition leads to METTL14 overexpression which promotes m6A modification via YTHDF2-dependent mechanism, reducing GPX4 mRNA stability and accelerating ferroptosis in endometrial cancer cells.","method":"Co-IP, in vitro arginine methylation, MeRIP, YTHDF2 RIP, xenograft models","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP and functional assays, single lab","pmids":["37973560"],"is_preprint":false},{"year":2024,"finding":"M. tuberculosis-secreted EsxB interacts with p38 MAP kinase to inhibit TAB1-mediated p38 autophosphorylation, which in turn prevents p38-mediated phosphorylation of METTL14 at Thr72, inhibiting liquid-liquid phase separation (LLPS) of METTL14 and its interaction with METTL3, resulting in decreased m6A modification of Nox2 mRNA and reduced host ROS-mediated anti-TB immunity.","method":"Co-IP, phosphorylation assays, LLPS experiments, MeRIP, METTL14 Thr72 mutation, in vivo infection models","journal":"Cell discovery","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical and genetic approaches including mutant validation in vivo, single lab","pmids":["38548762"],"is_preprint":false},{"year":2021,"finding":"LNC942 (LINC00942) directly recruits METTL14 protein via a specific sequence (+176-+265), stabilizing METTL14-mediated m6A methylation and increasing mRNA stability and protein expression of downstream targets CXCR4 and CYP1B1 in breast cancer cells.","method":"RNA pulldown, RIP, MeRIP, Co-IP, deletion mapping, in vivo xenograft","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 — RNA-protein interaction assays with functional validation, single lab","pmids":["32576970"],"is_preprint":false},{"year":2019,"finding":"β-cell-specific deletion of Mettl14 in mice causes glucose intolerance due to reduced insulin secretion, increased β-cell death, and decreased β-cell mass; RNA-seq revealed upregulation of IRE1α/sXBP-1 ER stress pathway, suggesting METTL14-mediated m6A is required for β-cell survival and function.","method":"Conditional KO mice (RIP-Cre), glucose tolerance tests, GSIS, TUNEL, RNA-seq","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with multiple defined phenotypic readouts in vivo","pmids":["31029827"],"is_preprint":false},{"year":2022,"finding":"METTL14 mediates m6A modification of METTL14 promotes maturation of pri-miR-17 by inhibiting YTHDC2-mediated recognition of the 'GGACC' binding site, thereby preventing pri-miR-17 mRNA decay and reducing mature miR-17-5p levels, which in turn affects Mitofusin 2 (MFN2) and mitochondrial homeostasis in colorectal cancer.","method":"MeRIP-seq, RIP, RNA stability assays, miRNA overexpression/knockdown","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2-3 — MeRIP plus multiple functional assays, single lab","pmids":["36810285"],"is_preprint":false},{"year":2023,"finding":"The METTL14 R298P cancer-associated mutation reduces m6A modification at canonical motifs but induces m6A modification at aberrant motifs; aberrant methylation alters methylation efficiency at surrounding canonical sites, including c-MET mRNA, severely destabilizing it, reducing c-Myc expression, and suppressing cell proliferation.","method":"MeRIP-seq in isogenic cell lines with heterozygous/homozygous R298P mutation, mRNA stability assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — isogenic mutant cell lines with genome-wide m6A sequencing and functional validation","pmids":["37355987"],"is_preprint":false},{"year":2021,"finding":"METTL14 promotes m6A modification of Notch1 mRNA, inhibiting its RNA stability and thus reducing Notch1 expression to suppress bladder tumor-initiating cell self-renewal and tumorigenesis.","method":"KO/overexpression, MeRIP, mRNA stability assay, in vivo tumorigenesis assay","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 — MeRIP with functional genetic experiments, single lab","pmids":["31760940"],"is_preprint":false},{"year":2024,"finding":"Cardiac METTL14 silencing suppresses Phlpp2 mRNA m6A modifications and activates Akt-S473 signaling to regulate cardiomyocyte growth and apoptosis; overexpression of wild-type but not MTase-inactive mutant METTL14 blocks exercise-induced physiological cardiac hypertrophy.","method":"Cardiac-specific KD and OE in vivo, enzymatic mutant, MeRIP, Akt signaling assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — enzymatic mutant validation plus in vivo cardiac model with defined molecular target","pmids":["36351918"],"is_preprint":false},{"year":2023,"finding":"METTL14 promotes m6A modification of KAT3B mRNA to enhance its expression; KAT3B then increases STING expression by enhancing H3K27ac at the STING promoter; this METTL14-KAT3B-STING axis promotes M1 macrophage polarization and NLRP3 inflammasome/pyroptosis after ischemic stroke.","method":"METTL14 knockdown in rats and cells, MeRIP, ChIP, in vivo MCAO model","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2-3 — MeRIP plus ChIP and in vivo model, single lab","pmids":["37541353"],"is_preprint":false},{"year":2024,"finding":"METTL14 mediates m6A modification of GluN2A (NMDAR subunit) mRNA via IGF2BP2 to stabilize it, enhancing presynaptic NMDAR activity in DRG neurons and contributing to chemotherapy-induced neuropathic pain; DBP transcription factor regulates METTL14 expression in this context.","method":"MeRIP, RIP, gain/loss-of-function in vivo and in vitro, behavioral pain assays, immunofluorescence in human DRGs","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2-3 — MeRIP plus in vivo functional validation, validated in human tissue, single lab","pmids":["38319733"],"is_preprint":false},{"year":2021,"finding":"NF-κB directly transactivates METTL14 (and METTL3) gene promoters upon LPS challenge in Kupffer cells; METTL14-mediated m6A on the 5'UTR of TGF-β1 mRNA promotes its cap-independent translation; METTL14 KO in myeloid cells abolishes LPS-induced TGF-β1 upregulation.","method":"ChIP-PCR, dual-luciferase reporter, m6A-seq, METTL14 KO mice, MeRIP with 5'UTR mutation","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"High","confidence_rationale":"Tier 2 — ChIP + reporter + m6A-seq + conditional KO mice with multiple orthogonal validations","pmids":["33992834"],"is_preprint":false},{"year":2017,"finding":"METTL3 and METTL14 cooperate in m6A modification to enhance translation of p21 3'UTR: METTL3/METTL14-mediated m6A facilitates NSUN2-mediated m5C methylation and vice versa; both modifications synergistically enhance p21 protein expression at the translational level during oxidative stress-induced senescence.","method":"In vitro methylation assays, KD of individual writers, p21 translation reporter assays","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vitro and cell-based assays for cross-talk between modifications, single lab","pmids":["28247949"],"is_preprint":false},{"year":2022,"finding":"METTL14-mediated m6A modification of NLRP3 mRNA is recognized by IGF2BP2 which stabilizes NLRP3 mRNA, activating the NLRP3 inflammasome in macrophages during acute lung injury; knockdown of IGF2BP2 diminished LPS-induced ALI in mice.","method":"MeRIP, RIP, IGF2BP2 KD, mouse ALI models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2-3 — MeRIP plus in vivo validation with reader identification, single lab","pmids":["38218935"],"is_preprint":false},{"year":2023,"finding":"Adipose METTL14 installs m6A on Adrb2, Adrb3, Atgl, and Cgi-58 transcripts in adipocytes, suppressing their translation; adipocyte-specific Mettl14 deletion decreases m6A on these transcripts and increases protein levels, thereby enhancing β-adrenergic signaling and lipolysis and protecting mice from diet-induced obesity.","method":"Adipocyte-specific Mettl14 KO mice, MeRIP, polysome profiling, metabolic phenotyping","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 2 — conditional KO mice with MeRIP and polysome analysis establishing mechanism","pmids":["37526326"],"is_preprint":false}],"current_model":"METTL14 is a catalytically inactive RNA-binding scaffold subunit that heterodimerizes with the catalytic subunit METTL3 to form the core m6A methyltransferase complex, enhancing RNA substrate recognition and METTL3 activity via its RGG-repeat RNA-binding domain; it is regulated post-translationally by PRMT1/PRMT3-mediated arginine methylation (at R255 and C-terminal residues) and by STUB1-mediated ubiquitin-proteasomal degradation that is competitively blocked by METTL3; independently of m6A, METTL14 also localizes to chromatin where it binds H3K27me3 and recruits KDM6B and PRC2 to regulate bivalent domain integrity and gene expression during stem cell differentiation."},"narrative":{"teleology":[{"year":2013,"claim":"Establishing METTL14 as a core m6A methyltransferase subunit resolved the long-standing question of which proteins catalyze m6A in mammalian cells, revealing a METTL3–METTL14 heterodimeric writer complex that interacts with WTAP.","evidence":"Biochemical reconstitution, Co-IP, and in vitro methylation assays in mammalian cells","pmids":["24316715"],"confidence":"High","gaps":["Relative catalytic contributions of METTL3 versus METTL14 were not resolved","Structural basis of the heterodimer was unknown","Mechanism of substrate RNA selection was undefined"]},{"year":2016,"claim":"High-resolution crystal structures revealed that METTL3 alone contains the AdoMet-binding catalytic pocket while METTL14 serves as a structurally degenerate, catalytically inactive scaffold providing the RNA-binding platform, resolving the division of labor within the complex.","evidence":"X-ray crystallography at 1.6–1.9 Å resolution with biochemical binding studies","pmids":["27281194"],"confidence":"High","gaps":["How METTL14's RNA-binding surface selects specific substrates was unclear","Post-translational regulation of the complex was unknown"]},{"year":2018,"claim":"Demonstration that METTL14's C-terminal RGG repeats are essential for RNA binding and complex activity established the molecular basis for METTL14's obligate contribution to catalysis despite lacking intrinsic methyltransferase activity.","evidence":"In vitro methylation with recombinant proteins, mutagenesis of RGG repeats, phosphoproteomics","pmids":["29348140"],"confidence":"High","gaps":["Whether RGG repeats recognize specific RNA structures was untested","Functional significance of identified phosphorylation sites was not established"]},{"year":2017,"claim":"Identification of MYB/MYC mRNAs as direct m6A targets downstream of METTL14 in AML, regulated by SPI1 transcriptional control of METTL14, demonstrated pathological consequences of METTL14-mediated m6A and established a disease-relevant signaling axis.","evidence":"Silencing/overexpression in AML cells and mouse models, MeRIP-seq, RNA stability assays","pmids":["29290617"],"confidence":"High","gaps":["How m6A readers decode MYB/MYC transcripts downstream was not defined","Whether METTL14 has AML-independent oncogenic roles was unclear"]},{"year":2019,"claim":"Conditional β-cell knockout demonstrated a physiological requirement for METTL14-mediated m6A in insulin secretion and β-cell survival, linking epitranscriptomic regulation to glucose homeostasis in vivo.","evidence":"β-cell-specific Mettl14 KO mice (RIP-Cre), glucose tolerance tests, TUNEL, RNA-seq","pmids":["31029827"],"confidence":"High","gaps":["Specific m6A target transcripts responsible for β-cell phenotype were not identified","Contribution of METTL14's m6A-independent chromatin roles in β-cells was not addressed"]},{"year":2021,"claim":"Discovery that METTL14 binds H3K27me3 and recruits KDM6B to regulate chromatin independently of METTL3 and m6A catalysis established a fundamentally new, m6A-independent chromatin-regulatory function for METTL14 in stem cell differentiation.","evidence":"ChIP-seq, METTL14 KO mESCs, enzymatic-dead mutant rescue, Co-IP with KDM6B","pmids":["33795874"],"confidence":"High","gaps":["Structural basis of METTL14–H3K27me3 interaction was unknown","Whether this chromatin role operates in differentiated somatic tissues was untested"]},{"year":2021,"claim":"PRMT1-mediated arginine methylation at R255 was shown to enhance METTL14's interaction with WTAP and RNA substrates, revealing the first post-translational regulatory mechanism that tunes m6A writer complex activity.","evidence":"Mass spectrometry, R255K mutant mESCs, reciprocal Co-IP, in vitro methylation, MeRIP-seq","pmids":["34145242"],"confidence":"High","gaps":["Whether other PRMTs contribute additional arginine methylation events was not resolved","Downstream reader recognition of PRMT1-regulated m6A sites was not examined"]},{"year":2021,"claim":"HRD1-mediated ubiquitination and proteasomal degradation of METTL14 under basal conditions, relieved during ER stress, established ubiquitin-dependent protein turnover as a mechanism linking ER proteostasis to m6A homeostasis and CHOP mRNA decay.","evidence":"Co-IP, ubiquitination assays, liver-specific KO mice, MeRIP-seq, m6A site mutagenesis","pmids":["34847358"],"confidence":"High","gaps":["Whether other E3 ligases contribute to METTL14 turnover under different stress conditions was unexplored"]},{"year":2021,"claim":"METTL14-mediated m6A on EBI3 mRNA in tumor-associated macrophages was shown to suppress CD8+ T cell function, establishing METTL14 as a regulator of anti-tumor immunity through epitranscriptomic control of cytokine expression.","evidence":"Macrophage-specific Mettl14 KO mice, MeRIP, EBI3 neutralization, T cell functional assays","pmids":["34019807"],"confidence":"High","gaps":["Whether METTL14 affects other immune checkpoint pathways beyond EBI3 was not addressed","Therapeutic targetability of METTL14 in immune cells was not tested"]},{"year":2022,"claim":"The METTL14 RGG domain was found to bind RNA G-quadruplex structures, providing a structural basis for how the m6A writer complex is recruited to specific methylation sites near rG4-forming sequences.","evidence":"EMSA, in vitro methylation assays, RGG deletion/mutation analysis","pmids":["34908152"],"confidence":"Medium","gaps":["In vivo validation of rG4-dependent m6A targeting was lacking","Whether rG4 binding accounts for a major fraction of METTL14-dependent m6A sites was unknown"]},{"year":2023,"claim":"STUB1-mediated ubiquitination at K148/K156/K162 and competitive protection by METTL3 binding revealed a homeostatic feedback mechanism ensuring that free METTL14 is rapidly degraded while complexed METTL14 is stabilized.","evidence":"Co-IP, ubiquitination assays, METTL3 deletion constructs, dot blot m6A quantification","pmids":["36597993"],"confidence":"High","gaps":["Whether STUB1 and HRD1 act redundantly or in distinct compartments was not clarified","Structural basis of METTL3–STUB1 competition for METTL14 was not resolved"]},{"year":2023,"claim":"Extension of METTL14's chromatin role showed it recruits not only KDM6B but also PRC2 and KDM5B to bivalent domains, maintaining both H3K27me3 and H3K4me3 marks, refining the model of how METTL14 preserves bivalent chromatin independently of m6A.","evidence":"ChIP-seq, METTL14 KO mESCs, Co-IP with PRC2 and KDM5B, nascent RNA assays","pmids":["37314930","37030005"],"confidence":"High","gaps":["Whether METTL14's chromatin function operates in differentiated cell types beyond mESCs was unknown","How METTL14 simultaneously recruits antagonistic enzymes (KDM6B vs PRC2) to the same loci was not mechanistically resolved"]},{"year":2024,"claim":"p38 MAPK-mediated phosphorylation of METTL14 at Thr72 was shown to promote its liquid–liquid phase separation and interaction with METTL3, revealing a new regulatory layer connecting inflammatory signaling to m6A complex assembly.","evidence":"Phosphorylation assays, LLPS experiments, T72A mutant, MeRIP, in vivo M. tuberculosis infection models","pmids":["38548762"],"confidence":"Medium","gaps":["Whether LLPS of METTL14 is a general regulatory mechanism beyond mycobacterial infection is untested","Structural determinants of phosphorylation-driven phase separation are unknown"]},{"year":null,"claim":"How METTL14 coordinates its dual functions as an m6A writer subunit and an m6A-independent chromatin regulator within the same cell, and whether these functions are mutually exclusive or spatiotemporally segregated, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of METTL14 bound to H3K27me3 nucleosomes exists","Whether post-translational modifications differentially direct METTL14 to RNA versus chromatin functions is unknown","The relative contribution of m6A-dependent versus m6A-independent METTL14 functions in disease contexts has not been systematically dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1,2,9]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[3,7,8]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,2,6]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2,3]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[3,7,8]}],"pathway":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[3,7,8]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,2,9,13]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[3,7,8]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,7,30]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[16,30,32]}],"complexes":["METTL3–METTL14 m6A methyltransferase complex","METTL3–METTL14–WTAP writer complex"],"partners":["METTL3","WTAP","KDM6B","PRC2","KDM5B","STUB1","PRMT1","HRD1"],"other_free_text":[]},"mechanistic_narrative":"METTL14 is an essential scaffold subunit of the mammalian m6A methyltransferase complex, functioning as a catalytically inactive RNA-binding platform that heterodimerizes with the catalytic subunit METTL3 to deposit N6-methyladenosine on mRNA and other nuclear RNAs, thereby regulating mRNA stability, translation, and pri-miRNA processing across diverse physiological contexts including hematopoiesis, β-cell function, adipocyte metabolism, and immune responses [PMID:24316715, PMID:27281194, PMID:29348140, PMID:31029827, PMID:37526326]. Structurally, METTL14 contributes a positively charged RNA-binding groove and C-terminal RGG repeats that engage RNA substrates—including G-quadruplex structures—while METTL3 exclusively harbors the S-adenosylmethionine-binding catalytic pocket [PMID:27281194, PMID:29348140, PMID:34908152]. METTL14 protein stability and activity are regulated by PRMT1/PRMT3-mediated arginine methylation, p38-dependent phosphorylation at Thr72 that promotes liquid–liquid phase separation, and ubiquitin-proteasomal degradation mediated by HRD1 and STUB1, the latter competitively blocked by METTL3 binding [PMID:34145242, PMID:37269817, PMID:34847358, PMID:36597993, PMID:38548762]. Independently of METTL3 and m6A catalysis, METTL14 localizes to chromatin where it binds H3K27me3 at bivalent domains and recruits the demethylase KDM6B and PRC2 to maintain bivalent chromatin integrity during embryonic stem cell differentiation [PMID:33795874, PMID:37314930, PMID:37030005]."},"prefetch_data":{"uniprot":{"accession":"Q9HCE5","full_name":"N(6)-adenosine-methyltransferase non-catalytic subunit METTL14","aliases":["Methyltransferase-like protein 14","hMETTL14"],"length_aa":456,"mass_kda":52.1,"function":"The METTL3-METTL14 heterodimer forms a N6-methyltransferase complex that methylates adenosine residues at the N(6) position of some mRNAs and regulates the circadian clock, differentiation of embryonic stem cells and cortical neurogenesis (PubMed:24316715, PubMed:24407421, PubMed:25719671, PubMed:27281194, PubMed:27373337, PubMed:29348140). In the heterodimer formed with METTL3, METTL14 constitutes the RNA-binding scaffold that recognizes the substrate rather than the catalytic core (PubMed:27281194, PubMed:27373337, PubMed:27627798, PubMed:29348140). N6-methyladenosine (m6A), which takes place at the 5'-[AG]GAC-3' consensus sites of some mRNAs, plays a role in mRNA stability and processing (PubMed:24316715, PubMed:24407421, PubMed:25719671). M6A acts as a key regulator of mRNA stability by promoting mRNA destabilization and degradation (By similarity). In embryonic stem cells (ESCs), m6A methylation of mRNAs encoding key naive pluripotency-promoting transcripts results in transcript destabilization (By similarity). M6A regulates spermatogonial differentiation and meiosis and is essential for male fertility and spermatogenesis (By similarity). 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)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9HCE5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/METTL14","classification":"Common Essential","n_dependent_lines":965,"n_total_lines":1208,"dependency_fraction":0.7988410596026491},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/METTL14","total_profiled":1310},"omim":[{"mim_id":"617283","title":"YTH DOMAIN-CONTAINING PROTEIN 1; YTHDC1","url":"https://www.omim.org/entry/617283"},{"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"},{"mim_id":"612472","title":"METHYLTRANSFERASE 3, N6-ADENOSINE-METHYLTRANSFERASE COMPLEX CATALYTIC SUBUNIT; METTL3","url":"https://www.omim.org/entry/612472"},{"mim_id":"609373","title":"LYSINE DEMETHYLASE 3B; KDM3B","url":"https://www.omim.org/entry/609373"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/METTL14"},"hgnc":{"alias_symbol":["KIAA1627"],"prev_symbol":[]},"alphafold":{"accession":"Q9HCE5","domains":[{"cath_id":"3.40.50.150","chopping":"146-393","consensus_level":"high","plddt":95.8321,"start":146,"end":393}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HCE5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HCE5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HCE5-F1-predicted_aligned_error_v6.png","plddt_mean":79.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=METTL14","jax_strain_url":"https://www.jax.org/strain/search?query=METTL14"},"sequence":{"accession":"Q9HCE5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HCE5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HCE5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HCE5"}},"corpus_meta":[{"pmid":"24316715","id":"PMC_24316715","title":"A METTL3-METTL14 complex 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Expression of CXCR4 and CYP1B1 by Affecting the Stability of METTL14.","date":"2022","source":"Journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/35178087","citation_count":28,"is_preprint":false},{"pmid":"33335426","id":"PMC_33335426","title":"METTL14 Overexpression Promotes Osteosarcoma Cell Apoptosis and Slows Tumor Progression via Caspase 3 Activation.","date":"2020","source":"Cancer management and research","url":"https://pubmed.ncbi.nlm.nih.gov/33335426","citation_count":27,"is_preprint":false},{"pmid":"38582397","id":"PMC_38582397","title":"XBP1s activates METTL3/METTL14 for ER-phagy and paclitaxel sensitivity regulation in breast cancer.","date":"2024","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/38582397","citation_count":24,"is_preprint":false},{"pmid":"37935312","id":"PMC_37935312","title":"METTL14-m6A-FOXO3a axis regulates autophagy and inflammation in ankylosing spondylitis.","date":"2023","source":"Clinical immunology (Orlando, Fla.)","url":"https://pubmed.ncbi.nlm.nih.gov/37935312","citation_count":24,"is_preprint":false},{"pmid":"35467063","id":"PMC_35467063","title":"Mechanism of METTL14 and m6A modification of lncRNA MALAT1 in the proliferation of oral squamous cell carcinoma cells.","date":"2022","source":"Oral diseases","url":"https://pubmed.ncbi.nlm.nih.gov/35467063","citation_count":24,"is_preprint":false},{"pmid":"35597169","id":"PMC_35597169","title":"Upregulation of METTL14 contributes to trophoblast dysfunction by elevating FOXO3a expression in an m6A-dependent manner.","date":"2022","source":"Placenta","url":"https://pubmed.ncbi.nlm.nih.gov/35597169","citation_count":24,"is_preprint":false},{"pmid":"35926466","id":"PMC_35926466","title":"METTL14-dependent m6A modification controls iNKT cell development and function.","date":"2022","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/35926466","citation_count":22,"is_preprint":false},{"pmid":"37355987","id":"PMC_37355987","title":"A cancer-associated METTL14 mutation induces aberrant m6A modification, affecting tumor growth.","date":"2023","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/37355987","citation_count":22,"is_preprint":false},{"pmid":"37269817","id":"PMC_37269817","title":"PRMT1 methylates METTL14 to modulate its oncogenic function.","date":"2023","source":"Neoplasia (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/37269817","citation_count":20,"is_preprint":false},{"pmid":"33143367","id":"PMC_33143367","title":"The Distinct Function and Localization of METTL3/METTL14 and METTL16 Enzymes in Cardiomyocytes.","date":"2020","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33143367","citation_count":20,"is_preprint":false},{"pmid":"37615536","id":"PMC_37615536","title":"METTL14 inhibits malignant progression of oral squamous cell carcinoma by targeting the autophagy-related gene RB1CC1 in an m6A-IGF2BP2-dependent manner.","date":"2023","source":"Clinical science (London, England : 1979)","url":"https://pubmed.ncbi.nlm.nih.gov/37615536","citation_count":20,"is_preprint":false},{"pmid":"39021049","id":"PMC_39021049","title":"METTL14 promotes lipid metabolism reprogramming and sustains nasopharyngeal carcinoma progression via enhancing m6A modification of ANKRD22 mRNA.","date":"2024","source":"Clinical and translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/39021049","citation_count":19,"is_preprint":false},{"pmid":"36352154","id":"PMC_36352154","title":"Mechanism of METTL14-mediated m6A modification in non-small cell lung cancer cell resistance to cisplatin.","date":"2022","source":"Journal of molecular medicine (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/36352154","citation_count":19,"is_preprint":false},{"pmid":"31429529","id":"PMC_31429529","title":"The study of METTL3 and METTL14 expressions in childhood ETV6/RUNX1-positive acute lymphoblastic leukemia.","date":"2019","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/31429529","citation_count":19,"is_preprint":false},{"pmid":"35060905","id":"PMC_35060905","title":"RNA binding to human METTL3-METTL14 restricts N6-deoxyadenosine methylation of DNA in vitro.","date":"2022","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/35060905","citation_count":18,"is_preprint":false},{"pmid":"38197667","id":"PMC_38197667","title":"Glycolysis Induced by METTL14 Is Essential for Macrophage Phagocytosis and Phenotype in Cervical Cancer.","date":"2024","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/38197667","citation_count":18,"is_preprint":false},{"pmid":"34586620","id":"PMC_34586620","title":"METTL14-Mediated miR-30c-1-3p Maturation Represses the Progression of Lung Cancer via Regulation of MARCKSL1 Expression.","date":"2021","source":"Molecular biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/34586620","citation_count":18,"is_preprint":false},{"pmid":"35116983","id":"PMC_35116983","title":"Knockdown of METTL14 inhibits the growth and invasion of cervical cancer.","date":"2019","source":"Translational cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/35116983","citation_count":17,"is_preprint":false},{"pmid":"38548762","id":"PMC_38548762","title":"Mycobacterium tuberculosis inhibits METTL14-mediated m6A methylation of Nox2 mRNA and suppresses anti-TB immunity.","date":"2024","source":"Cell discovery","url":"https://pubmed.ncbi.nlm.nih.gov/38548762","citation_count":16,"is_preprint":false},{"pmid":"36264762","id":"PMC_36264762","title":"METTL14 promotes migration and invasion of choroidal melanoma by targeting RUNX2 mRNA via m6A modification.","date":"2022","source":"Journal of cellular and molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36264762","citation_count":16,"is_preprint":false},{"pmid":"35698136","id":"PMC_35698136","title":"Mettl14-mediated m6A modification is essential for visual function and retinal photoreceptor survival.","date":"2022","source":"BMC biology","url":"https://pubmed.ncbi.nlm.nih.gov/35698136","citation_count":16,"is_preprint":false},{"pmid":"37436654","id":"PMC_37436654","title":"The m6A methylation enzyme METTL14 regulates myocardial ischemia/reperfusion injury through the Akt/mTOR signaling pathway.","date":"2023","source":"Molecular and cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/37436654","citation_count":16,"is_preprint":false},{"pmid":"35947961","id":"PMC_35947961","title":"Mettl14-driven senescence-associated secretory phenotype facilitates somatic cell reprogramming.","date":"2022","source":"Stem cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/35947961","citation_count":15,"is_preprint":false},{"pmid":"40011892","id":"PMC_40011892","title":"JMJD6 K375 acetylation restrains lung cancer progression by enhancing METTL14/m6A/SLC3A2 axis mediated cell ferroptosis.","date":"2025","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40011892","citation_count":15,"is_preprint":false},{"pmid":"36341394","id":"PMC_36341394","title":"Mettl14-mediated m6A modification enhances the function of Foxp3+ regulatory T cells and promotes allograft acceptance.","date":"2022","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36341394","citation_count":15,"is_preprint":false},{"pmid":"39563370","id":"PMC_39563370","title":"METTL14 suppresses the expression of YAP1 and the stemness of triple-negative breast cancer.","date":"2024","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/39563370","citation_count":14,"is_preprint":false},{"pmid":"33134390","id":"PMC_33134390","title":"Downregulated METTL14 Expression Correlates with Breast Cancer Tumor Grade and Molecular Classification.","date":"2020","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/33134390","citation_count":14,"is_preprint":false},{"pmid":"36569923","id":"PMC_36569923","title":"Roles of the m6A methyltransferases METTL3, METTL14, and WTAP in pulmonary tuberculosis.","date":"2022","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36569923","citation_count":14,"is_preprint":false},{"pmid":"38993012","id":"PMC_38993012","title":"METTL14 plays an oncogenic role in NSCLC by modulating ferroptosis and the m6A modification of GPX4.","date":"2024","source":"Archives of physiology and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38993012","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54742,"output_tokens":7663,"usd":0.139586},"stage2":{"model":"claude-opus-4-6","input_tokens":11444,"output_tokens":3670,"usd":0.223455},"total_usd":0.363041,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"METTL14 catalyzes N6-methyladenosine (m6A) RNA methylation and forms a stable heterodimer core complex with METTL3 that functions in cellular m6A deposition on mammalian nuclear RNAs; WTAP interacts with this complex and affects methylation.\",\n      \"method\": \"Biochemical characterization, Co-IP, in vitro methylation assay\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — original discovery paper with >2700 citations, multiple orthogonal methods, replicated extensively\",\n      \"pmids\": [\"24316715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structures of METTL3-METTL14 heterodimer reveal that METTL3 is the catalytic core (AdoMet binds only to METTL3 pocket), while METTL14 serves as an RNA-binding platform with a positively charged groove; combined biochemical analysis confirms this division of labor.\",\n      \"method\": \"X-ray crystallography (1.6-1.9 Å resolution), biochemical assays, ligand-binding studies\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structures in three states plus functional biochemistry, ~980 citations\",\n      \"pmids\": [\"27281194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The C-terminal RGG repeats of METTL14 are required for METTL3/METTL14 methyltransferase activity by contributing to RNA substrate binding; monomeric METTL3 is soluble but inactive, and METTL14 alone has a degenerated catalytic center and is also inactive. Nuclear localization signals were identified and endogenous phosphorylation sites were mapped on both proteins.\",\n      \"method\": \"In vitro methylation assay with recombinant proteins, binding surface mapping, mutagenesis, mass spectrometry phosphoproteomics\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis and multiple orthogonal methods\",\n      \"pmids\": [\"29348140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL14 binds H3K27me3 and recruits KDM6B to induce H3K27me3 demethylation independently of METTL3 and independently of m6A methyltransferase activity, regulating heterochromatin and the transition from self-renewal to differentiation in mouse embryonic stem cells.\",\n      \"method\": \"ChIP-seq, KO mESCs, co-IP, functional differentiation assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal chromatin methods plus genetic KO, m6A-independent function validated by enzymatic mutants\",\n      \"pmids\": [\"33795874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRMT1 interacts with METTL14 and methylates it at arginine 255 (R255me), which greatly enhances interaction of METTL3/METTL14 with WTAP and promotes binding of the complex to substrate RNA, thereby increasing global mRNA m6A modification and driving endoderm differentiation in mESCs.\",\n      \"method\": \"Mass spectrometry, reciprocal Co-IP, in vitro methylation, METTL14 R255K mutant mESCs, MeRIP-seq\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — MS identification plus mutagenesis, in vitro reconstitution, and cellular genetic model\",\n      \"pmids\": [\"34145242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HRD1 E3 ligase mediates ubiquitination and degradation of METTL14 under basal ER conditions; accumulation of unfolded/misfolded proteins during ER stress competes with HRD1-ERAD to block METTL14 ubiquitination, stabilizing METTL14 which then promotes m6A-dependent decay of CHOP mRNA (via its 3'UTR m6A) to suppress pro-apoptotic signaling.\",\n      \"method\": \"Co-IP, ubiquitination assay, liver-specific KO mice, MeRIP-seq, mutagenesis of m6A sites, luciferase reporter\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal biochemical and genetic approaches in vitro and in vivo\",\n      \"pmids\": [\"34847358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"STUB1 E3 ligase directly interacts with METTL14 and mediates its ubiquitination at lysines K148, K156, and K162, leading to proteasomal degradation and decreased global m6A; METTL3 competes with STUB1 for METTL14 binding (via METTL3 residues 450-454 and 464-480), thereby protecting METTL14 from degradation and maintaining m6A homeostasis.\",\n      \"method\": \"Co-IP, ubiquitination assay, mutagenesis, METTL3 deletion constructs, dot blot\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, mutagenesis, and multiple biochemical validations\",\n      \"pmids\": [\"36597993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL14 specifically binds bivalent chromatin domains (H3K27me3/H3K4me3) and recruits PRC2 (H3K27 methyltransferase) and KDM5B (H3K4 demethylase) to chromatin, independently of METTL3 or m6A, to enhance H3K27me3 and reduce H3K4me3, thereby maintaining bivalent domain integrity in mESCs.\",\n      \"method\": \"ChIP-seq, METTL14 KO mESCs, Co-IP with PRC2 and KDM5B, nascent RNA assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple chromatin and interaction assays, m6A-independent function confirmed\",\n      \"pmids\": [\"37314930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL14 binds H3K27me3 and recruits KDM6B to demethylate H3K27me3 independently of its RNA methyltransferase activity; depletion of METTL14 causes global H3K27me3 increase and gene suppression, establishing a chromatin regulatory role distinct from METTL3.\",\n      \"method\": \"ChIP-seq, KO mESCs, Co-IP, enzymatic mutant rescue experiments\",\n      \"journal\": \"Protein & cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — independent paper confirming m6A-independent chromatin function with multiple orthogonal methods\",\n      \"pmids\": [\"37030005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL14 RGG repeats bind RNA G-quadruplex (rG4) structures, and the METTL3/METTL14 heterodimer selectively methylates adenosines close to rG4 sequences, suggesting direct recruitment of the m6A writer complex to specific methylation sites near G4-forming regions.\",\n      \"method\": \"Electrophoretic mobility shift assay, in vitro methylation assay, deletion/mutation analysis of RGG repeats\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro binding and activity assays, single lab\",\n      \"pmids\": [\"34908152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL3-METTL14 complex is active in vitro on double-stranded DNA containing UV-induced cyclopyrimidine dimers, abasic sites, or mismatches, producing N6-methyladenine (N6mA) in DNA; N6mA in the template strand inhibits its excision by the adenine DNA glycosylase MYH, suggesting a mechanism for reducing inappropriate misrepair at DNA lesion sites.\",\n      \"method\": \"In vitro methylation assay on DNA substrates, structural analysis of YTHDC1 with gapped DNA duplex\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with defined substrates, single study\",\n      \"pmids\": [\"34086966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RNA binding to METTL3-METTL14 restricts N6-deoxyadenosine methylation of DNA in vitro; the complex preferentially catalyzes m6dA in single-stranded DNA despite weaker DNA binding, while it binds structured RNAs with high affinity but methylates them less efficiently than ssDNA.\",\n      \"method\": \"Systematic in vitro methylation activity assays and binding affinity measurements with various DNA/RNA substrates\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — systematic in vitro biochemistry, single lab\",\n      \"pmids\": [\"35060905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL14 promotes global genome repair (GGR) through m6A-mediated translation of DDB2 mRNA; UVB irradiation degrades METTL14 via NBR1-dependent selective autophagy; overexpression of enzymatically active (but not inactive mutant) METTL14 restores GGR and DDB2 levels; YTHDF1 (m6A reader) also binds DDB2 transcript and promotes its translation.\",\n      \"method\": \"KD/OE with enzymatic mutant, autophagy assay, GGR assay, Co-IP/RIP, mouse skin KO model\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including enzymatic mutant rescue, in vivo mouse model, and reader identification\",\n      \"pmids\": [\"34452996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"METTL14 regulates MYB and MYC mRNA targets through m6A modification to exert its oncogenic role in AML; the protein is negatively regulated at the transcriptional level by SPI1, defining a SPI1-METTL14-MYB/MYC signaling axis in myelopoiesis.\",\n      \"method\": \"Silencing/overexpression in AML cells and mouse models, MeRIP-seq, RNA stability assays, ChIP for SPI1\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse models plus MeRIP-seq and epistasis experiments, high citations\",\n      \"pmids\": [\"29290617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL14 increases m6A modification of FOXO1 mRNA and enhances its translation through YTHDF1 recognition; METTL14 also directly binds to FOXO1 protein and acts on the promoters of VCAM-1 and ICAM-1 to promote their transcription, mediating endothelial cell inflammatory response and atherosclerotic plaque formation.\",\n      \"method\": \"RIP assay, MeRIP-seq, METTL14 KO mice, Co-IP, luciferase reporter\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vivo KO plus multiple binding assays, single lab\",\n      \"pmids\": [\"32802173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL14 increases m6A modification of Myd88 mRNA to stabilize it, activating the MyD88/NF-κB/IL-6 pathway in macrophages; Myd88 then affects p65 nuclear distribution to regulate IL-6 transcription, promoting macrophage inflammation and atherosclerosis.\",\n      \"method\": \"MeRIP, RIP, mRNA stability assay, Mettl14 KO mice, NF-κB reporter\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vivo KO plus MeRIP and mRNA stability assays, single lab\",\n      \"pmids\": [\"35598196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Macrophage-specific Mettl14 knockout decreases m6A on Ebi3 mRNA and increases EBI3 (cytokine subunit) transcript levels, driving CD8+ T cell dysfunction; neutralization of EBI3 reinvigorates dysfunctional CD8+ T cells, placing METTL14-mediated m6A upstream of EBI3 in tumor immune suppression.\",\n      \"method\": \"Macrophage-specific KO mice, MeRIP, mRNA stability, EBI3 neutralization, T cell functional assays\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO plus multiple orthogonal mechanistic assays\",\n      \"pmids\": [\"34019807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Viral EBV oncoprotein EBNA3C activates transcription of METTL14 and directly interacts with METTL14 to promote its protein stability, thereby hijacking METTL14-mediated m6A modification of viral latent transcripts to drive EBV-associated tumorigenesis.\",\n      \"method\": \"Co-IP, Co-immunofluorescence, knockdown, xenograft tumor models\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus in vivo xenograft, single lab\",\n      \"pmids\": [\"31226160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"METTL14 regulates m6A modification of pri-miR-19a, enhancing its processing to mature miR-19a through recognition by the microprocessor component DGCR8 in a METTL14-dependent manner, thereby promoting proliferation and invasion of atherosclerotic vascular endothelial cells.\",\n      \"method\": \"Co-IP (METTL14-DGCR8), RIP, RT-qPCR, KD/OE experiments\",\n      \"journal\": \"European review for medical and pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP and RIP with functional KD/OE, single lab\",\n      \"pmids\": [\"32633395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRMT1 methylates METTL14 at two major arginine residues at its C-terminus; the reader protein SPF30 recognizes this asymmetric dimethylarginine modification; arginine methylation of METTL14 is required for its function in catalyzing m6A modification.\",\n      \"method\": \"Co-IP, in vitro methylation, PRMT1 inhibitor treatment, mass spectrometry\",\n      \"journal\": \"Neoplasia (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — biochemical and cell-based assays, single lab\",\n      \"pmids\": [\"37269817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PRMT3 interacts with METTL14 and mediates its arginine methylation; PRMT3 inhibition leads to METTL14 overexpression which promotes m6A modification via YTHDF2-dependent mechanism, reducing GPX4 mRNA stability and accelerating ferroptosis in endometrial cancer cells.\",\n      \"method\": \"Co-IP, in vitro arginine methylation, MeRIP, YTHDF2 RIP, xenograft models\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP and functional assays, single lab\",\n      \"pmids\": [\"37973560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"M. tuberculosis-secreted EsxB interacts with p38 MAP kinase to inhibit TAB1-mediated p38 autophosphorylation, which in turn prevents p38-mediated phosphorylation of METTL14 at Thr72, inhibiting liquid-liquid phase separation (LLPS) of METTL14 and its interaction with METTL3, resulting in decreased m6A modification of Nox2 mRNA and reduced host ROS-mediated anti-TB immunity.\",\n      \"method\": \"Co-IP, phosphorylation assays, LLPS experiments, MeRIP, METTL14 Thr72 mutation, in vivo infection models\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical and genetic approaches including mutant validation in vivo, single lab\",\n      \"pmids\": [\"38548762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LNC942 (LINC00942) directly recruits METTL14 protein via a specific sequence (+176-+265), stabilizing METTL14-mediated m6A methylation and increasing mRNA stability and protein expression of downstream targets CXCR4 and CYP1B1 in breast cancer cells.\",\n      \"method\": \"RNA pulldown, RIP, MeRIP, Co-IP, deletion mapping, in vivo xenograft\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — RNA-protein interaction assays with functional validation, single lab\",\n      \"pmids\": [\"32576970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"β-cell-specific deletion of Mettl14 in mice causes glucose intolerance due to reduced insulin secretion, increased β-cell death, and decreased β-cell mass; RNA-seq revealed upregulation of IRE1α/sXBP-1 ER stress pathway, suggesting METTL14-mediated m6A is required for β-cell survival and function.\",\n      \"method\": \"Conditional KO mice (RIP-Cre), glucose tolerance tests, GSIS, TUNEL, RNA-seq\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with multiple defined phenotypic readouts in vivo\",\n      \"pmids\": [\"31029827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL14 mediates m6A modification of METTL14 promotes maturation of pri-miR-17 by inhibiting YTHDC2-mediated recognition of the 'GGACC' binding site, thereby preventing pri-miR-17 mRNA decay and reducing mature miR-17-5p levels, which in turn affects Mitofusin 2 (MFN2) and mitochondrial homeostasis in colorectal cancer.\",\n      \"method\": \"MeRIP-seq, RIP, RNA stability assays, miRNA overexpression/knockdown\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — MeRIP plus multiple functional assays, single lab\",\n      \"pmids\": [\"36810285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The METTL14 R298P cancer-associated mutation reduces m6A modification at canonical motifs but induces m6A modification at aberrant motifs; aberrant methylation alters methylation efficiency at surrounding canonical sites, including c-MET mRNA, severely destabilizing it, reducing c-Myc expression, and suppressing cell proliferation.\",\n      \"method\": \"MeRIP-seq in isogenic cell lines with heterozygous/homozygous R298P mutation, mRNA stability assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — isogenic mutant cell lines with genome-wide m6A sequencing and functional validation\",\n      \"pmids\": [\"37355987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL14 promotes m6A modification of Notch1 mRNA, inhibiting its RNA stability and thus reducing Notch1 expression to suppress bladder tumor-initiating cell self-renewal and tumorigenesis.\",\n      \"method\": \"KO/overexpression, MeRIP, mRNA stability assay, in vivo tumorigenesis assay\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — MeRIP with functional genetic experiments, single lab\",\n      \"pmids\": [\"31760940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cardiac METTL14 silencing suppresses Phlpp2 mRNA m6A modifications and activates Akt-S473 signaling to regulate cardiomyocyte growth and apoptosis; overexpression of wild-type but not MTase-inactive mutant METTL14 blocks exercise-induced physiological cardiac hypertrophy.\",\n      \"method\": \"Cardiac-specific KD and OE in vivo, enzymatic mutant, MeRIP, Akt signaling assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — enzymatic mutant validation plus in vivo cardiac model with defined molecular target\",\n      \"pmids\": [\"36351918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"METTL14 promotes m6A modification of KAT3B mRNA to enhance its expression; KAT3B then increases STING expression by enhancing H3K27ac at the STING promoter; this METTL14-KAT3B-STING axis promotes M1 macrophage polarization and NLRP3 inflammasome/pyroptosis after ischemic stroke.\",\n      \"method\": \"METTL14 knockdown in rats and cells, MeRIP, ChIP, in vivo MCAO model\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — MeRIP plus ChIP and in vivo model, single lab\",\n      \"pmids\": [\"37541353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"METTL14 mediates m6A modification of GluN2A (NMDAR subunit) mRNA via IGF2BP2 to stabilize it, enhancing presynaptic NMDAR activity in DRG neurons and contributing to chemotherapy-induced neuropathic pain; DBP transcription factor regulates METTL14 expression in this context.\",\n      \"method\": \"MeRIP, RIP, gain/loss-of-function in vivo and in vitro, behavioral pain assays, immunofluorescence in human DRGs\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — MeRIP plus in vivo functional validation, validated in human tissue, single lab\",\n      \"pmids\": [\"38319733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NF-κB directly transactivates METTL14 (and METTL3) gene promoters upon LPS challenge in Kupffer cells; METTL14-mediated m6A on the 5'UTR of TGF-β1 mRNA promotes its cap-independent translation; METTL14 KO in myeloid cells abolishes LPS-induced TGF-β1 upregulation.\",\n      \"method\": \"ChIP-PCR, dual-luciferase reporter, m6A-seq, METTL14 KO mice, MeRIP with 5'UTR mutation\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP + reporter + m6A-seq + conditional KO mice with multiple orthogonal validations\",\n      \"pmids\": [\"33992834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"METTL3 and METTL14 cooperate in m6A modification to enhance translation of p21 3'UTR: METTL3/METTL14-mediated m6A facilitates NSUN2-mediated m5C methylation and vice versa; both modifications synergistically enhance p21 protein expression at the translational level during oxidative stress-induced senescence.\",\n      \"method\": \"In vitro methylation assays, KD of individual writers, p21 translation reporter assays\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vitro and cell-based assays for cross-talk between modifications, single lab\",\n      \"pmids\": [\"28247949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL14-mediated m6A modification of NLRP3 mRNA is recognized by IGF2BP2 which stabilizes NLRP3 mRNA, activating the NLRP3 inflammasome in macrophages during acute lung injury; knockdown of IGF2BP2 diminished LPS-induced ALI in mice.\",\n      \"method\": \"MeRIP, RIP, IGF2BP2 KD, mouse ALI models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — MeRIP plus in vivo validation with reader identification, single lab\",\n      \"pmids\": [\"38218935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Adipose METTL14 installs m6A on Adrb2, Adrb3, Atgl, and Cgi-58 transcripts in adipocytes, suppressing their translation; adipocyte-specific Mettl14 deletion decreases m6A on these transcripts and increases protein levels, thereby enhancing β-adrenergic signaling and lipolysis and protecting mice from diet-induced obesity.\",\n      \"method\": \"Adipocyte-specific Mettl14 KO mice, MeRIP, polysome profiling, metabolic phenotyping\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO mice with MeRIP and polysome analysis establishing mechanism\",\n      \"pmids\": [\"37526326\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"METTL14 is a catalytically inactive RNA-binding scaffold subunit that heterodimerizes with the catalytic subunit METTL3 to form the core m6A methyltransferase complex, enhancing RNA substrate recognition and METTL3 activity via its RGG-repeat RNA-binding domain; it is regulated post-translationally by PRMT1/PRMT3-mediated arginine methylation (at R255 and C-terminal residues) and by STUB1-mediated ubiquitin-proteasomal degradation that is competitively blocked by METTL3; independently of m6A, METTL14 also localizes to chromatin where it binds H3K27me3 and recruits KDM6B and PRC2 to regulate bivalent domain integrity and gene expression during stem cell differentiation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"METTL14 is an essential scaffold subunit of the mammalian m6A methyltransferase complex, functioning as a catalytically inactive RNA-binding platform that heterodimerizes with the catalytic subunit METTL3 to deposit N6-methyladenosine on mRNA and other nuclear RNAs, thereby regulating mRNA stability, translation, and pri-miRNA processing across diverse physiological contexts including hematopoiesis, β-cell function, adipocyte metabolism, and immune responses [PMID:24316715, PMID:27281194, PMID:29348140, PMID:31029827, PMID:37526326]. Structurally, METTL14 contributes a positively charged RNA-binding groove and C-terminal RGG repeats that engage RNA substrates—including G-quadruplex structures—while METTL3 exclusively harbors the S-adenosylmethionine-binding catalytic pocket [PMID:27281194, PMID:29348140, PMID:34908152]. METTL14 protein stability and activity are regulated by PRMT1/PRMT3-mediated arginine methylation, p38-dependent phosphorylation at Thr72 that promotes liquid–liquid phase separation, and ubiquitin-proteasomal degradation mediated by HRD1 and STUB1, the latter competitively blocked by METTL3 binding [PMID:34145242, PMID:37269817, PMID:34847358, PMID:36597993, PMID:38548762]. Independently of METTL3 and m6A catalysis, METTL14 localizes to chromatin where it binds H3K27me3 at bivalent domains and recruits the demethylase KDM6B and PRC2 to maintain bivalent chromatin integrity during embryonic stem cell differentiation [PMID:33795874, PMID:37314930, PMID:37030005].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing METTL14 as a core m6A methyltransferase subunit resolved the long-standing question of which proteins catalyze m6A in mammalian cells, revealing a METTL3–METTL14 heterodimeric writer complex that interacts with WTAP.\",\n      \"evidence\": \"Biochemical reconstitution, Co-IP, and in vitro methylation assays in mammalian cells\",\n      \"pmids\": [\"24316715\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative catalytic contributions of METTL3 versus METTL14 were not resolved\", \"Structural basis of the heterodimer was unknown\", \"Mechanism of substrate RNA selection was undefined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"High-resolution crystal structures revealed that METTL3 alone contains the AdoMet-binding catalytic pocket while METTL14 serves as a structurally degenerate, catalytically inactive scaffold providing the RNA-binding platform, resolving the division of labor within the complex.\",\n      \"evidence\": \"X-ray crystallography at 1.6–1.9 Å resolution with biochemical binding studies\",\n      \"pmids\": [\"27281194\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How METTL14's RNA-binding surface selects specific substrates was unclear\", \"Post-translational regulation of the complex was unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstration that METTL14's C-terminal RGG repeats are essential for RNA binding and complex activity established the molecular basis for METTL14's obligate contribution to catalysis despite lacking intrinsic methyltransferase activity.\",\n      \"evidence\": \"In vitro methylation with recombinant proteins, mutagenesis of RGG repeats, phosphoproteomics\",\n      \"pmids\": [\"29348140\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RGG repeats recognize specific RNA structures was untested\", \"Functional significance of identified phosphorylation sites was not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of MYB/MYC mRNAs as direct m6A targets downstream of METTL14 in AML, regulated by SPI1 transcriptional control of METTL14, demonstrated pathological consequences of METTL14-mediated m6A and established a disease-relevant signaling axis.\",\n      \"evidence\": \"Silencing/overexpression in AML cells and mouse models, MeRIP-seq, RNA stability assays\",\n      \"pmids\": [\"29290617\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How m6A readers decode MYB/MYC transcripts downstream was not defined\", \"Whether METTL14 has AML-independent oncogenic roles was unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Conditional β-cell knockout demonstrated a physiological requirement for METTL14-mediated m6A in insulin secretion and β-cell survival, linking epitranscriptomic regulation to glucose homeostasis in vivo.\",\n      \"evidence\": \"β-cell-specific Mettl14 KO mice (RIP-Cre), glucose tolerance tests, TUNEL, RNA-seq\",\n      \"pmids\": [\"31029827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific m6A target transcripts responsible for β-cell phenotype were not identified\", \"Contribution of METTL14's m6A-independent chromatin roles in β-cells was not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that METTL14 binds H3K27me3 and recruits KDM6B to regulate chromatin independently of METTL3 and m6A catalysis established a fundamentally new, m6A-independent chromatin-regulatory function for METTL14 in stem cell differentiation.\",\n      \"evidence\": \"ChIP-seq, METTL14 KO mESCs, enzymatic-dead mutant rescue, Co-IP with KDM6B\",\n      \"pmids\": [\"33795874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of METTL14–H3K27me3 interaction was unknown\", \"Whether this chromatin role operates in differentiated somatic tissues was untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"PRMT1-mediated arginine methylation at R255 was shown to enhance METTL14's interaction with WTAP and RNA substrates, revealing the first post-translational regulatory mechanism that tunes m6A writer complex activity.\",\n      \"evidence\": \"Mass spectrometry, R255K mutant mESCs, reciprocal Co-IP, in vitro methylation, MeRIP-seq\",\n      \"pmids\": [\"34145242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other PRMTs contribute additional arginine methylation events was not resolved\", \"Downstream reader recognition of PRMT1-regulated m6A sites was not examined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"HRD1-mediated ubiquitination and proteasomal degradation of METTL14 under basal conditions, relieved during ER stress, established ubiquitin-dependent protein turnover as a mechanism linking ER proteostasis to m6A homeostasis and CHOP mRNA decay.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, liver-specific KO mice, MeRIP-seq, m6A site mutagenesis\",\n      \"pmids\": [\"34847358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other E3 ligases contribute to METTL14 turnover under different stress conditions was unexplored\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"METTL14-mediated m6A on EBI3 mRNA in tumor-associated macrophages was shown to suppress CD8+ T cell function, establishing METTL14 as a regulator of anti-tumor immunity through epitranscriptomic control of cytokine expression.\",\n      \"evidence\": \"Macrophage-specific Mettl14 KO mice, MeRIP, EBI3 neutralization, T cell functional assays\",\n      \"pmids\": [\"34019807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether METTL14 affects other immune checkpoint pathways beyond EBI3 was not addressed\", \"Therapeutic targetability of METTL14 in immune cells was not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The METTL14 RGG domain was found to bind RNA G-quadruplex structures, providing a structural basis for how the m6A writer complex is recruited to specific methylation sites near rG4-forming sequences.\",\n      \"evidence\": \"EMSA, in vitro methylation assays, RGG deletion/mutation analysis\",\n      \"pmids\": [\"34908152\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo validation of rG4-dependent m6A targeting was lacking\", \"Whether rG4 binding accounts for a major fraction of METTL14-dependent m6A sites was unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"STUB1-mediated ubiquitination at K148/K156/K162 and competitive protection by METTL3 binding revealed a homeostatic feedback mechanism ensuring that free METTL14 is rapidly degraded while complexed METTL14 is stabilized.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, METTL3 deletion constructs, dot blot m6A quantification\",\n      \"pmids\": [\"36597993\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether STUB1 and HRD1 act redundantly or in distinct compartments was not clarified\", \"Structural basis of METTL3–STUB1 competition for METTL14 was not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extension of METTL14's chromatin role showed it recruits not only KDM6B but also PRC2 and KDM5B to bivalent domains, maintaining both H3K27me3 and H3K4me3 marks, refining the model of how METTL14 preserves bivalent chromatin independently of m6A.\",\n      \"evidence\": \"ChIP-seq, METTL14 KO mESCs, Co-IP with PRC2 and KDM5B, nascent RNA assays\",\n      \"pmids\": [\"37314930\", \"37030005\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether METTL14's chromatin function operates in differentiated cell types beyond mESCs was unknown\", \"How METTL14 simultaneously recruits antagonistic enzymes (KDM6B vs PRC2) to the same loci was not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"p38 MAPK-mediated phosphorylation of METTL14 at Thr72 was shown to promote its liquid–liquid phase separation and interaction with METTL3, revealing a new regulatory layer connecting inflammatory signaling to m6A complex assembly.\",\n      \"evidence\": \"Phosphorylation assays, LLPS experiments, T72A mutant, MeRIP, in vivo M. tuberculosis infection models\",\n      \"pmids\": [\"38548762\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether LLPS of METTL14 is a general regulatory mechanism beyond mycobacterial infection is untested\", \"Structural determinants of phosphorylation-driven phase separation are unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How METTL14 coordinates its dual functions as an m6A writer subunit and an m6A-independent chromatin regulator within the same cell, and whether these functions are mutually exclusive or spatiotemporally segregated, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of METTL14 bound to H3K27me3 nucleosomes exists\", \"Whether post-translational modifications differentially direct METTL14 to RNA versus chromatin functions is unknown\", \"The relative contribution of m6A-dependent versus m6A-independent METTL14 functions in disease contexts has not been systematically dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1, 2, 9]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [3, 7, 8]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 2, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [3, 7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [3, 7, 8]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 2, 9, 13]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [3, 7, 8]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 7, 30]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16, 30, 32]}\n    ],\n    \"complexes\": [\n      \"METTL3–METTL14 m6A methyltransferase complex\",\n      \"METTL3–METTL14–WTAP writer complex\"\n    ],\n    \"partners\": [\n      \"METTL3\",\n      \"WTAP\",\n      \"KDM6B\",\n      \"PRC2\",\n      \"KDM5B\",\n      \"STUB1\",\n      \"PRMT1\",\n      \"HRD1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}