{"gene":"WTAP","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2014,"finding":"WTAP is a regulatory subunit of the m6A methyltransferase complex: it interacts with METTL3 and METTL14, is required for their localization into nuclear speckles, and is required for catalytic m6A methyltransferase activity in vivo. In the absence of WTAP, the RNA-binding capability of METTL3 is strongly reduced, indicating WTAP regulates recruitment of the complex to mRNA targets.","method":"Co-immunoprecipitation, PAR-CLIP, nuclear speckle localization experiments, knockdown studies, transcriptomic analyses, zebrafish morpholino knockdown","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, PAR-CLIP, functional KD in cell lines and in vivo zebrafish, multiple orthogonal methods; widely replicated across subsequent studies","pmids":["24407421"],"is_preprint":false},{"year":2018,"finding":"Recombinant protein mapping defined binding surfaces within the METTL3/METTL14-WTAP complex; nuclear localization signals were identified on each subunit; phosphorylation sites were identified on the endogenous proteins. Monomeric METTL3 is soluble but inactive, and the catalytic center of METTL14 is degenerate and inactive; the C-terminal RGG repeats of METTL14 contribute to RNA substrate binding and are required for METTL3/14 activity.","method":"Recombinant protein binding surface mapping, in vitro methylation assay, mutagenesis of RGG repeats, phosphorylation site identification on endogenous proteins","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution, mutagenesis, and binding surface mapping with recombinant proteins in a single rigorous study","pmids":["29348140"],"is_preprint":false},{"year":2018,"finding":"Both knockdown and overexpression of METTL3 results in upregulation of WTAP protein, demonstrating that METTL3 levels are critical for WTAP protein homeostasis. WTAP upregulation alone is not sufficient to promote cell proliferation in the absence of functional METTL3, indicating WTAP's oncogenic function is strictly dependent on a functional m6A methylation complex.","method":"METTL3 knockdown and overexpression, western blot, cell proliferation assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD and OE experiments with defined molecular readout, single lab, two complementary perturbations","pmids":["30038300"],"is_preprint":false},{"year":2018,"finding":"The WTAP-METTL3-METTL14 RNA N6-adenosine methyltransferase complex positively controls adipogenesis by promoting cell cycle transition during mitotic clonal expansion (MCE). Knockdown of WTAP (or METTL3/METTL14) leads to cell cycle arrest and impaired adipogenesis associated with suppression of cyclin A2 upregulation. Wtap heterozygous knockout mice are protected from diet-induced obesity with smaller, fewer adipocytes and improved insulin sensitivity.","method":"siRNA knockdown of WTAP/METTL3/METTL14, cell cycle analysis, adipogenesis assays, Wtap heterozygous knockout mouse model, diet-induced obesity model","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KD with defined phenotypic readout in vitro and KO mouse model in vivo, multiple orthogonal methods","pmids":["29866655"],"is_preprint":false},{"year":2008,"finding":"Wtap is essential for differentiation of endoderm and mesoderm during mouse embryogenesis. Wtap gene-trap mutant embryos fail to form endoderm and mesoderm, die by E10.5, and Wtap mutant embryonic stem cells fail to differentiate into these lineages. Chimera analysis showed Wtap function in extraembryonic tissues is required for mesoderm/endoderm formation in embryonic tissues.","method":"Gene-trap mouse knockout, chimera analysis, embryonic stem cell differentiation assays","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function in vivo with defined developmental phenotype, chimera analysis providing cell-autonomous/non-autonomous distinction","pmids":["18224709"],"is_preprint":false},{"year":2021,"finding":"WTAP regulates TCR signaling, thymocyte differentiation, activation-induced death of peripheral T cells, and gut RORγt+ regulatory T cell function. Transcriptome and epitranscriptomic analyses showed that m6A modification destabilizes Orai1 and Ripk1 mRNAs; loss of this post-transcriptional repression correlates with increased store-operated calcium entry and diminished T cell survival in Wtap conditional knockout mice.","method":"Conditional genetic inactivation of Wtap in T cells, transcriptome/MeRIP-seq analyses, calcium entry assays, T cell phenotyping","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse with defined signaling phenotype and MeRIP-seq identification of direct mRNA targets, multiple orthogonal methods","pmids":["35879451"],"is_preprint":false},{"year":2020,"finding":"Conditional deletion of Wtap in Sertoli cells results in sterility and progressive loss of spermatogonial stem cell (SSC) population. m6A sequencing identified 21,909 m6A sites across 6,122 genes in Sertoli cells. Wtap deletion sharply alters alternative splicing of transcripts encoding SSC niche factors and severely dysregulates their translation.","method":"Conditional Wtap knockout in Sertoli cells, m6A sequencing, RNA sequencing, ribosome nascent-chain complex-bound mRNA sequencing","journal":"Stem cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined in vivo phenotype and multiple transcriptomic/epitranscriptomic methods","pmids":["33053361"],"is_preprint":false},{"year":2022,"finding":"WTAP is required for postnatal development and maturation of brown adipose tissue (BAT). BAT-specific knockout of Wtap impairs maturation and causes whitening of interscapular BAT, hypothermia, and cold intolerance. Mechanistically, WTAP deficiency decreases m6A mRNA modification by reducing the protein stability of METTL3; BAT-specific overexpression of Mettl3 partially rescues the phenotypes.","method":"BAT-specific Wtap knockout, phenotypic analysis (cold challenge, thermogenesis), western blot for METTL3 protein stability, Mettl3 overexpression rescue, single nucleus RNA-seq","journal":"Life metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO with defined in vivo phenotype and genetic rescue experiment establishing epistasis (WTAP → METTL3 stability)","pmids":["39872074"],"is_preprint":false},{"year":2022,"finding":"WTAP is required for maintaining islet beta cell function; beta cell-specific deletion of Wtap induces severe hyperglycemia, beta cell failure, and diabetes. WTAP deficiency decreases m6A mRNA modification and reduces expression of beta cell-specific transcription factors and insulin secretion-related genes by reducing METTL3 protein levels. Beta cell-specific overexpression of Mettl3 partially reverses these abnormalities.","method":"Beta cell-specific Wtap knockout, Mettl3 overexpression rescue, glucose tolerance/GSIS assays, RNA-seq, MeRIP-seq","journal":"Diabetologia","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO and genetic rescue establishing WTAP→METTL3 mechanism, supported by MeRIP-seq; multiple orthogonal methods","pmids":["36920524"],"is_preprint":false},{"year":2022,"finding":"Loss of Wtap in Purkinje cells causes early-onset cerebellar ataxia, cerebellar atrophy, extensive Purkinje cell degeneration and apoptosis, and aberrant degradation of PC synapses. WTAP depletion decreases METTL3/14 protein levels and reduces m6A methylation in Purkinje cells.","method":"Purkinje cell-specific Wtap knockout, behavioral ataxia testing, histological analysis, western blot for METTL3/14, m6A methylation quantification","journal":"Journal of genetics and genomics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-type-specific KO with defined in vivo neurological phenotype and mechanistic molecular readouts, single lab","pmids":["35304325"],"is_preprint":false},{"year":2022,"finding":"WTAP deficiency in cardiomyocytes induces dilated cardiomyopathy and heart failure. Unlike in other tissues, WTAP deficiency in the heart decreases chromatin accessibility at promoters of Mef2a and Mef2c, reducing their expression. WTAP directly binds to the Mef2c gene promoter and increases its promoter activity (demonstrated by luciferase assay). Cardiomyocyte-specific overexpression of Mettl3 does not rescue the phenotypes, indicating this cardiac function is m6A-independent.","method":"Cardiomyocyte-specific Wtap knockout, Mettl3 overexpression rescue experiment (negative result for rescue), chromatin accessibility assay (ATAC-seq), luciferase promoter assay, ChIP","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO, failed METTL3 rescue establishing m6A-independent mechanism, luciferase assay for direct promoter binding, multiple orthogonal methods","pmids":["38224851"],"is_preprint":false},{"year":2022,"finding":"During HCV infection, WTAP (normally a predominantly nuclear protein) is relocalized to the cytoplasm. WTAP is required for both METTL3 interaction with HCV RNA and m6A modification across the viral RNA genome in the cytoplasm. WTAP, METTL3, and METTL14 negatively regulate production of infectious HCV virions. WTAP's regulation of HCV RNA m6A modification and virion production is independent of its nuclear localization.","method":"Subcellular fractionation, RIP with HCV RNA, m6A sequencing of viral RNA, WTAP knockdown/rescue with nuclear-localization mutants, infectious virus production assays","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — localization experiment with functional consequence, RIP, nuclear-localization mutant rescue establishing localization-function relationship, multiple orthogonal methods","pmids":["36314819"],"is_preprint":false},{"year":2021,"finding":"WTAP-mediated m6A modification of ETS1 mRNA leads to post-transcriptional suppression of ETS1 with involvement of HuR as an RNA stabilizer. WTAP promotes HCC cell proliferation and G2/M cell cycle arrest through the HuR-ETS1-p21/p27 axis.","method":"m6A dot blot, MeRIP assay, RNA immunoprecipitation (RIP) assay, dual luciferase reporter assay, ChIP assay, RNA-seq, WTAP knockdown/overexpression","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (MeRIP, RIP, luciferase) in single lab identifying mechanistic axis","pmids":["31438961"],"is_preprint":false},{"year":2021,"finding":"circ0008399 binds WTAP protein to promote formation of the WTAP/METTL3/METTL14 m6A methyltransferase complex, increasing its assembly and activity and promoting m6A-dependent stabilization of TNFAIP3 mRNA, thereby reducing cisplatin sensitivity in bladder cancer.","method":"RNA pulldown, RIP assay, MeRIP assay, Co-IP for complex assembly, functional cisplatin sensitivity assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pulldown and RIP establish binding, functional assays show consequence; single lab with multiple methods but no in vitro reconstitution","pmids":["34702726"],"is_preprint":false},{"year":2021,"finding":"circPDE5A forms a complex with WTAP (verified by RNA pulldown and RIP) and blocks WTAP-dependent m6A methylation of EIF3C mRNA, disrupting EIF3C translation and inactivating the MAPK pathway to restrain prostate cancer metastasis.","method":"RNA pulldown followed by mass spectrometry, RIP, MeRIP-seq, in vitro and in vivo functional assays","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pulldown+MS and RIP establish interaction, MeRIP-seq shows downstream effect; single lab","pmids":["35650605"],"is_preprint":false},{"year":2021,"finding":"WTAP promotes m6A modification of NLRP3 mRNA to upregulate NLRP3 inflammasome activation, leading to cell pyroptosis and inflammation in diabetic nephropathy. WTAP-mediated m6A stabilization of NLRP3 mRNA is recognized by IGF2BP1. Histone acetyltransferase p300 regulates WTAP expression upstream.","method":"WTAP knockdown/overexpression, MeRIP assay, RIP assay, m6A dot blot, IGF2BP1 RIP, p300 inhibitor (C646) treatment","journal":"Cellular & molecular biology letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MeRIP, RIP, functional assays in cells and db/db mice; single lab with multiple orthogonal methods","pmids":["35761192"],"is_preprint":false},{"year":2022,"finding":"WTAP-mediated m6A modification of lncRNA DIAPH1-AS1 enhances its stability through the m6A reader IGF2BP2. DIAPH1-AS1 acts as a molecular adaptor promoting MTDH-LASP1 complex formation and LASP1 upregulation, facilitating NPC growth and metastasis. KAT3A-mediated H3K27 acetylation fine-tunes WTAP expression in NPC.","method":"MeRIP assay, RIP assay, IGF2BP2 binding assay, Co-IP (MTDH-LASP1), ChIP for H3K27ac, WTAP knockdown/overexpression","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple binding and modification assays in single lab; direct m6A-stability mechanism established but downstream complex characterization partially indirect","pmids":["34999731"],"is_preprint":false},{"year":2022,"finding":"WTAP increases in senescent nucleus pulposus cells due to KDM5a-mediated epigenetic increase in H3K4me3 at the WTAP promoter. WTAP promotes m6A modification of lncRNA NORAD, leading to YTHDF2-mediated decay of NORAD. Reduced NORAD leads to less sequestration of PUMILIO proteins, augmenting PUM1/2 activity and repressing E2F3 mRNA, promoting cellular senescence and IVDD.","method":"m6A sequencing (m6A-seq), gain/loss-of-function experiments, ChIP for H3K4me3, MeRIP, YTHDF2 RIP, functional senescence assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m6A-seq + ChIP + MeRIP + functional assays in single lab; pathway epistasis established through multiple complementary methods","pmids":["35304463"],"is_preprint":false},{"year":2021,"finding":"C5aR1-positive neutrophil-secreted IL1β and TNFα cooperatively activate ERK1/2 signaling, which phosphorylates WTAP at serine 341, stabilizing the WTAP protein. Stabilized WTAP then promotes m6A methylation of ENO1 mRNA, increasing ENO1 expression and breast cancer cell glycolysis.","method":"ERK1/2 inhibition, phosphorylation site identification (S341), western blot for WTAP stability, MeRIP for ENO1 m6A, glycolysis assays, WTAP silencing in vivo","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — phosphorylation site identified, MeRIP confirms m6A on ENO1, functional in vitro and in vivo; single lab, specific phospho-site not validated by mutagenesis in abstract","pmids":["34312368"],"is_preprint":false},{"year":2022,"finding":"WTAP promotes m6A modification of NORAD lncRNA and pri-miRNA processing: WTAP-mediated m6A modification of pri-miR-181a and pri-miR-181c is recognized by YTHDC1, increasing maturation to miR-181a/c. These miRNAs inhibit SFRP1 mRNA, promoting osteogenic differentiation of BMSCs via activation of Wnt signaling.","method":"Co-IP, RIP, MeRIP, RNA pulldown, dual-luciferase assay, ALP activity, Alizarin Red staining, micro-CT","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple binding assays and functional differentiation readouts in single lab; YTHDC1 recognition of m6A-modified pri-miRNA established by RIP/Co-IP","pmids":["36650131"],"is_preprint":false},{"year":2022,"finding":"WTAP mediates m6A modification of ATF4 mRNA, regulating its expression, and thereby promotes endoplasmic reticulum stress and apoptosis in cardiomyocytes during hypoxia/reoxygenation. WTAP expression is time-dependently increased by H/R. The inhibitory effects of WTAP on ER stress and apoptosis are ATF4-dependent.","method":"WTAP knockdown/overexpression, MeRIP for ATF4 m6A, ER stress inhibitor (4-PBA) rescue, in vivo I/R model","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MeRIP + functional rescue + in vivo confirmation; single lab","pmids":["33819187"],"is_preprint":false},{"year":2022,"finding":"WTAP mediates m6A modification of FOXO3a mRNA through the m6A reader YTHDF1, enhancing FOXO3a mRNA stability and expression. This WTAP/YTHDF1/m6A/FOXO3a axis regulates myocardial I/R injury progression.","method":"MeRIP-seq identifying m6A site in 3'-UTR of FOXO3a, YTHDF1 RIP, RNA stability assay, WTAP knockdown in H9C2 cells and I/R rat model","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MeRIP-seq + reader RIP + functional assays; single lab","pmids":["36894806"],"is_preprint":false},{"year":2022,"finding":"WTAP deficiency in hepatocytes causes NASH by increasing lipolysis in white adipose tissue, enhancing hepatic free fatty acid uptake, and inducing inflammation. Mechanistically, WTAP binds specific DNA motifs in promoters and suppresses gene expression (Igfbp1, Cd36, Ccl2) with involvement of HDAC1. In NASH, CDK9-mediated phosphorylation of WTAP causes its translocation from nucleus to cytosol.","method":"Hepatocyte-specific Wtap knockout, ChIP for WTAP-DNA binding and HDAC1, CDK9 inhibitor/kinase assay, subcellular fractionation, gene expression profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — hepatocyte-specific KO, ChIP establishing direct DNA binding, CDK9-mediated phosphorylation and nuclear-to-cytoplasmic translocation; multiple orthogonal methods in a single comprehensive study","pmids":["35927268"],"is_preprint":false},{"year":2023,"finding":"Hepatic deletion of Wtap promotes HCC progression. WTAP interacts with RNA polymerase II and H3K9ac to maintain expression of proteasome-related genes (Psmb4, Psmb6). WTAP deficiency decreases proteasome gene expression, increasing protein stability of GRB2 and ERK1/2, thereby activating the ERK signaling pathway and increasing hepatocyte proliferation.","method":"Hepatocyte-specific Wtap knockout, ChIP for RNA Pol II and H3K9ac at proteasome gene promoters, western blot for GRB2/ERK stability, PSMB4/PSMB6 restoration rescue experiments","journal":"Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO, ChIP establishing direct chromatin interaction, genetic rescue with PSMB4/PSMB6 restoring GRB2/ERK levels; multiple orthogonal methods","pmids":["37777158"],"is_preprint":false},{"year":2023,"finding":"PRMT1 methylates WTAP protein; this methylation is required for WTAP-dependent m6A modification of NDUFS6 mRNA. PRMT1 knockdown reduces OXPHOS in multiple myeloma cells through NDUFS6 downregulation, and this is mediated via WTAP.","method":"Co-IP to identify WTAP-PRMT1 interaction, methylation assay, MeRIP for NDUFS6 m6A, PRMT1 knockdown/overexpression, in vitro and in vivo functional assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP establishes interaction, functional methylation consequence shown; specific arginine site of WTAP methylation not detailed in abstract, single lab","pmids":["37558663"],"is_preprint":false},{"year":2023,"finding":"HIF1α directly binds the hypoxia-response element of the WTAP gene promoter and transactivates WTAP expression in t(8;21) AML. Elevated WTAP increases m6A modification of KDM4B transcripts, promoting their translation; this drives crosstalk between m6A RNA methylation and histone H3K9 trimethylation.","method":"ChIP (HIF1α binding to WTAP HRE), m6A profiling (transcriptome-wide), KDM4B knockdown, pharmacological/genetic HIF1α intervention, in vitro and in vivo AML models","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms direct promoter binding, m6A profiling + KDM4B functional data; single lab with multiple orthogonal methods","pmids":["37087529"],"is_preprint":false},{"year":2022,"finding":"TTC22 directly interacts with the 60S ribosomal protein RPL4, which promotes binding of WTAP mRNA to RPL4 and enhances WTAP mRNA stability and translation efficiency. WTAP mRNA is itself an m6A target recognized by YTHDF1, and TTC22 triggers a positive feedback loop between WTAP protein expression and WTAP mRNA m6A modification.","method":"Co-IP (TTC22-RPL4), RIP (YTHDF1-WTAP mRNA), m6A MeRIP, WTAP mRNA stability assay, YTHDF1 knockdown, luciferase reporter","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and RIP establish interactions, mRNA stability and luciferase assays show functional consequence; single lab","pmids":["35798874"],"is_preprint":false},{"year":2022,"finding":"WTAP-mediated m6A modification of WTAP's target mRNAs promotes maturation of pri-miR-92b to miR-92b-5p in an m6A-dependent manner; m6A modification also directly facilitates YTHDF2-dependent degradation of TIMP4 mRNAs. Both mechanisms contribute to OA progression.","method":"MeRIP, RIP for DGCR8 (microprocessor) and YTHDF2, pri-miRNA processing assay, WTAP knockdown/overexpression, DMM mouse model","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MeRIP + RIP for two distinct mechanistic arms; single lab with multiple methods","pmids":["37563688"],"is_preprint":false},{"year":2022,"finding":"WTAP interacts with DGCR8 (microprocessor component) and accelerates maturation of pri-miR-29b-3p in an m6A-dependent manner, increasing miR-29b-3p levels, which inhibit HDAC4 expression to promote osteogenic and inhibit adipogenic differentiation of BMSCs.","method":"Co-IP (WTAP-DGCR8), MeRIP for pri-miR-29b, dual-luciferase (miR-29b-3p binding to HDAC4), differentiation assays, in vivo mouse model","journal":"Stem cells translational medicine","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP + MeRIP + luciferase + functional differentiation assays; single lab","pmids":["37010483"],"is_preprint":false},{"year":2022,"finding":"WTAP interacts with DGCR8 to regulate microRNA-200 processing in an m6A-dependent way; miR-200 positively regulates glycolysis enzyme HK2, accelerating the Warburg effect in ovarian cancer. WTAP expression is positively regulated by HIF-1α under hypoxia.","method":"Co-IP (WTAP-DGCR8), MeRIP for pri-miR-200 m6A, functional glycolysis assays, HIF-1α knockdown/OE, WTAP KD/OE","journal":"Journal of immunology research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP + MeRIP + functional assays; single lab; HIF-1α regulation of WTAP shown by KD/OE without detailed promoter mechanism","pmids":["35733918"],"is_preprint":false},{"year":2022,"finding":"WTAP affects SUV39H1 mRNA m6A methylation, reducing H3K9me3 enrichment at the CCL2 promoter, thereby promoting CCL2 secretion and macrophage recruitment during corneal neovascularization. Separately, WTAP regulates translational efficiency of HIF-1α via m6A modification.","method":"MeRIP (SUV39H1 mRNA), ChIP (H3K9me3 at CCL2 promoter), WTAP knockdown/AAV overexpression in vivo, tube formation assay","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MeRIP + ChIP establishing epigenetic cascade; functional in vivo confirmation; single lab","pmids":["37019244"],"is_preprint":false},{"year":2022,"finding":"EP3 receptor activation prevents ubiquitin-mediated proteasomal degradation of WTAP by eliminating PKA-mediated ERK1/2 inhibition during brown adipocyte differentiation, thereby stabilizing WTAP protein. Stabilized WTAP then mediates m6A modification of Zfp410 mRNA, stabilizing it and promoting brown adipogenesis.","method":"EP3 knockout mouse, brown adipocyte-specific WTAP KO, ubiquitination assay, PKA inhibition, ERK1/2 phosphorylation analysis, MeRIP (Zfp410), in vivo BAT formation assay","journal":"EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse models, ubiquitination assay establishing degradation mechanism, PKA/ERK epistasis, MeRIP for downstream target; multiple orthogonal methods in single comprehensive study","pmids":["35781818"],"is_preprint":false},{"year":2023,"finding":"p65 (NF-κB subunit) transcriptionally regulates WTAP expression; elevated WTAP is more prone to phase separation, facilitating aggregation of the m6A writer complex to nuclear speckles and deposition of m6A marks on inflammatory transcripts, accelerating proinflammatory responses. Myeloid-specific WTAP deficiency attenuates LPS-induced sepsis and DSS-induced IBD.","method":"Myeloid-specific Wtap KO mouse, p65 ChIP on WTAP promoter, phase separation assay, m6A sequencing, functional inflammatory models (LPS sepsis, DSS colitis)","journal":"Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO, ChIP establishing transcriptional regulation, phase separation assay, multiple in vivo inflammatory models, m6A sequencing","pmids":["39007267"],"is_preprint":false},{"year":2023,"finding":"A cleaved form of METTL3 (METTL3a, residues 239-580) is required for the METTL3-WTAP interaction. METTL3a is essential for the METTL3-METTL3 interaction, which is a prerequisite step for recruitment of WTAP into the MTC. METTL3 cleavage is mediated by the proteasome in an mTOR-dependent manner, revealing positive regulatory feedback.","method":"Identification of METTL3a by mass spectrometry, Co-IP (METTL3a-WTAP, METTL3-METTL3), m6A sequencing, mTOR inhibition, proteasome inhibition, mutagenesis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with mutagenesis, MS-based identification of cleaved form, m6A sequencing, pharmacological rescue; multiple orthogonal methods in a single study","pmids":["37589705"],"is_preprint":false},{"year":2023,"finding":"WTAP-mediated m6A modification of AR (androgen receptor) mRNA induces its degradation in a YTHDF2-dependent manner. AR directly interacts with mitochondrial lipid oxidation enzyme Decr1; AR overexpression suppresses Decr1-mediated mitochondrial lipid oxidation, inhibiting cardiac fibroblast proliferation and migration. WTAP thus promotes diabetic cardiac fibrosis by boosting mitochondrial lipid oxidation through AR methylation.","method":"MeRIP for AR m6A, YTHDF2 RIP/KD, Co-IP (AR-Decr1), mitochondrial lipid oxidation assay, cardiac fibroblast functional assays, human DCM tissue analysis","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MeRIP + YTHDF2 RIP/KD + Co-IP + functional assays; single lab with multiple methods but no in vitro reconstitution","pmids":["37810250"],"is_preprint":false},{"year":2023,"finding":"WTAP mediates m6A modification of TNFAIP3 mRNA and ENO1 mRNA (m6A-dependent stabilization), VEGFA mRNA (promoting MAPK signaling via YTHDC1 as reader), and promotes cancer glycolysis; WTAP mediates m6A modification of FOXP3 mRNA (stabilized via YTHDF1); multiple cancer-specific targets established.","method":"MeRIP-seq + RNA-seq, YTHDC1/YTHDF1 RIP, tube formation assay, WTAP KD/OE in CRC cells","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MeRIP-seq + reader RIP identify specific targets; functional assays in single lab","pmids":["37428639"],"is_preprint":false},{"year":2025,"finding":"OGT-mediated O-GlcNAcylation and USP7-mediated de-ubiquitination synergistically enhance WTAP protein stability in GBM. Stabilized WTAP promotes LOXL2 mRNA m6A modification, enhancing its stability via IGF2BP2 and increasing secreted LOXL2 (sLOXL2). sLOXL2 activates integrin α5β1-FAK-ERK signaling in GSCs (mesenchymal transition) and in MDMs (M2 polarization), promoting immune evasion.","method":"Mass spectrometry (O-GlcNAcylation sites), Co-IP (WTAP-USP7, WTAP-OGT), RIP (IGF2BP2-LOXL2), MeRIP, integrin signaling pathway analysis, single-cell RNA-seq","journal":"Neuro-oncology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MS identification of PTM + Co-IP + RIP + MeRIP + functional pathway analysis; single lab","pmids":["39671515"],"is_preprint":false},{"year":2021,"finding":"WTAP knockdown in porcine parthenogenetic zygotes significantly reduces blastocyst rate and global m6A levels without affecting cleavage rate, and downregulates pluripotency genes (OCT4, SOX2, NANOG) while upregulating apoptotic genes (BAX, CASPASE3), demonstrating WTAP is required for early embryonic development through m6A modification.","method":"Microinjection of si-WTAP into porcine zygotes, m6A quantification, TUNEL staining, qPCR for pluripotency/apoptosis genes","journal":"Animals","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean loss-of-function in zygotes with defined developmental and molecular phenotype; single species/lab","pmids":["34199793"],"is_preprint":false},{"year":2024,"finding":"WTAP directly acts on NLRP3 mRNA, regulates its m6A level, and promotes NLRP3 protein expression after neuronal injury via YTHDF1. YTHDF1 directly binds NLRP3 mRNA and regulates NLRP3 protein translation. Conditional neuron-specific Wtap knockout suppresses neuroinflammation after TBI.","method":"Conditional Wtap knockout (flox/flox, Camk2a-cre), AAV-shYTHDF1, RIP (YTHDF1-NLRP3 mRNA), MeRIP (NLRP3 m6A), neurological function assays","journal":"International journal of surgery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO + RIP + MeRIP + YTHDF1 knockdown with functional rescue; single lab","pmids":["38874470"],"is_preprint":false},{"year":2024,"finding":"IFN-γ activates ERK signaling in MSCs, inducing WTAP phosphorylation and stabilizing WTAP post-transcriptionally. Stabilized WTAP increases m6A modification and mRNA stability of immunosuppressive molecules (IDO1, PD-L1, ICAM1, VCAM1) in a YTHDF1-dependent manner, amplifying the immunosuppressive capacity of IFN-γ-licensed MSCs.","method":"Epitranscriptomic microarray, MeRIP-qPCR, RIP-qPCR, RNA stability assay, ERK inhibition, western blot, functional T cell suppression assay, DSS colitis and CIA in vivo models","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MeRIP + RIP + RNA stability + functional in vivo assays; ERK-WTAP phosphorylation cascade established; single lab","pmids":["38944238"],"is_preprint":false}],"current_model":"WTAP is an essential regulatory (non-catalytic) subunit of the nuclear m6A methyltransferase complex (with METTL3 and METTL14) that recruits the complex to target mRNAs, is required for METTL3/14 localization to nuclear speckles and catalytic activity, and regulates a broad spectrum of biological processes—including embryogenesis, T cell signaling, adipogenesis, neuronal function, cardiac development, and immune responses—through m6A-dependent stabilization or destabilization of specific mRNAs via reader proteins (YTHDF1/2, YTHDC1, IGF2BPs); additionally, WTAP itself is post-translationally regulated by phosphorylation (ERK1/2, CDK9), O-GlcNAcylation (OGT), ubiquitination/de-ubiquitination (USP7), and proteasomal degradation, which modulate its nuclear localization and protein stability, and in some cellular contexts (notably cardiomyocytes) WTAP exerts m6A-independent functions by directly binding chromatin to regulate transcription."},"narrative":{"mechanistic_narrative":"WTAP is an essential, non-catalytic regulatory subunit of the nuclear m6A methyltransferase complex, where it interacts with METTL3 and METTL14, drives their localization to nuclear speckles, and is required for catalytic m6A deposition in vivo by enabling complex recruitment to mRNA targets [PMID:24407421]. The complex is built through ordered assembly in which a cleaved form of METTL3 (METTL3a) mediates METTL3-METTL3 interaction as a prerequisite for WTAP recruitment, while METTL14 provides RNA-substrate binding through its C-terminal RGG repeats [PMID:29348140, PMID:37589705]. WTAP and METTL3 are mutually dependent for protein homeostasis, and in several tissues WTAP loss destabilizes METTL3/14 such that Mettl3 re-expression rescues the phenotype, establishing WTAP as an upstream stabilizer of the writer machinery [PMID:30038300, PMID:39872074, PMID:36920524]. Through m6A deposition read out by YTHDF1/2, YTHDC1, and IGF2BPs, WTAP controls the stability, translation, splicing, and miRNA processing of defined transcripts to govern embryonic differentiation, adipogenesis, spermatogenesis, T-cell and innate immune signaling, and neuronal and cardiac homeostasis [PMID:29866655, PMID:18224709, PMID:35879451, PMID:33053361, PMID:35304325, PMID:39007267]. WTAP itself is a regulatory hub: its protein stability and nuclear localization are tuned by ERK1/2- and CDK9-mediated phosphorylation, OGT O-GlcNAcylation, USP7 de-ubiquitination, and proteasomal degradation, and its abundance is set transcriptionally by HIF1α, NF-κB p65, p300, and chromatin modifiers [PMID:34312368, PMID:35927268, PMID:35781818, PMID:39007267, PMID:39671515]. Beyond its canonical m6A role, WTAP also acts m6A-independently in some contexts by binding chromatin directly—activating Mef2c promoter activity in cardiomyocytes and associating with RNA polymerase II to maintain proteasome-gene expression in hepatocytes [PMID:38224851, PMID:35927268, PMID:37777158].","teleology":[{"year":2008,"claim":"Established WTAP as a developmentally essential gene before its molecular function was known, defining the biological stakes of its later-characterized activity.","evidence":"Gene-trap knockout and chimera analysis in mouse embryos and ES cells","pmids":["18224709"],"confidence":"High","gaps":["Molecular mechanism of the differentiation block not defined at this stage","No link to m6A yet established"]},{"year":2014,"claim":"Defined WTAP's core molecular function: a regulatory subunit that recruits METTL3/METTL14 to mRNA and is required for nuclear-speckle localization and catalytic m6A activity, explaining its essentiality.","evidence":"Co-IP, PAR-CLIP, speckle localization, knockdown, transcriptomics, zebrafish morpholino","pmids":["24407421"],"confidence":"High","gaps":["Does not resolve assembly order of the complex","Direct mRNA-recruitment mechanism inferred from reduced METTL3 RNA binding, not structurally defined"]},{"year":2018,"claim":"Resolved the architecture and catalytic logic of the writer complex, showing METTL3 is the active subunit, METTL14 is catalytically degenerate but contributes RNA binding via RGG repeats, and mapping WTAP binding surfaces and phosphosites.","evidence":"Recombinant binding-surface mapping, in vitro methylation, RGG mutagenesis, phosphosite identification","pmids":["29348140"],"confidence":"High","gaps":["Functional consequence of mapped WTAP phosphosites not tested","WTAP's precise structural contribution to activity not resolved"]},{"year":2018,"claim":"Showed WTAP and METTL3 are mutually dependent for protein homeostasis and that WTAP's oncogenic activity strictly requires a functional methylation complex, and that the complex drives adipogenesis via cell-cycle control in clonal expansion.","evidence":"METTL3 KD/OE with western blot and proliferation assays; siRNA KD, Wtap heterozygous KO mice, diet-induced obesity model","pmids":["30038300","29866655"],"confidence":"High","gaps":["Mechanism by which METTL3 sets WTAP protein levels not defined in 2018","Direct cell-cycle target transcripts not fully enumerated"]},{"year":2020,"claim":"Demonstrated tissue-specific requirement for WTAP-dependent m6A in regulating both alternative splicing and translation of niche-factor transcripts during spermatogenesis.","evidence":"Conditional Sertoli-cell Wtap KO, m6A-seq, RNA-seq, ribosome-bound mRNA sequencing","pmids":["33053361"],"confidence":"High","gaps":["Individual causal target transcripts not isolated","Reader proteins mediating splicing vs translation effects not assigned"]},{"year":2021,"claim":"Defined direct mRNA targets in T cells, showing m6A destabilization of Orai1 and Ripk1 couples WTAP to calcium signaling and T-cell survival, extending its role to adaptive immunity.","evidence":"Conditional Wtap KO in T cells, MeRIP-seq, calcium-entry assays, T-cell phenotyping","pmids":["35879451"],"confidence":"High","gaps":["Reader protein for Orai1/Ripk1 destabilization not specified","Direct vs indirect contribution to Treg function not fully separated"]},{"year":2021,"claim":"Began mapping upstream control of WTAP, showing ERK1/2 phosphorylation at S341 stabilizes the protein in response to inflammatory cytokines, linking the tumor microenvironment to m6A output.","evidence":"ERK inhibition, phosphosite identification, WTAP stability western blot, ENO1 MeRIP, glycolysis and in vivo assays","pmids":["34312368"],"confidence":"Medium","gaps":["S341 not validated by phospho-dead mutagenesis in the report","Single lab/cancer context"]},{"year":2022,"claim":"Established that WTAP loss destabilizes METTL3/14 protein across multiple tissues, with Mettl3 re-expression rescuing phenotypes, defining WTAP as an upstream stabilizer of the writer complex in brown fat, beta cells, and Purkinje neurons.","evidence":"Tissue-specific Wtap KOs, METTL3/14 western blots, Mettl3 overexpression rescue, MeRIP-seq, snRNA-seq","pmids":["39872074","36920524","35304325"],"confidence":"High","gaps":["Molecular basis of METTL3/14 destabilization upon WTAP loss not resolved","Why rescue is only partial not explained"]},{"year":2022,"claim":"Uncovered m6A-independent chromatin functions of WTAP: direct promoter binding to activate Mef2c in cardiomyocytes (METTL3-non-rescuable) and DNA-motif binding with HDAC1 to repress lipid/inflammatory genes in hepatocytes, where CDK9 phosphorylation drives nuclear-to-cytoplasmic translocation.","evidence":"Cardiomyocyte- and hepatocyte-specific Wtap KO, failed Mettl3 rescue, ATAC-seq, ChIP, luciferase, CDK9 kinase assay, subcellular fractionation","pmids":["38224851","35927268"],"confidence":"High","gaps":["DNA sequence specificity and structural basis of WTAP chromatin binding undefined","Determinants choosing m6A vs chromatin mode per tissue unknown"]},{"year":2022,"claim":"Showed WTAP relocalizes to the cytoplasm during HCV infection to m6A-modify viral RNA and restrict infectious virion production, demonstrating localization-dependent functional switching independent of nuclear residence.","evidence":"Subcellular fractionation, RIP with HCV RNA, viral m6A-seq, NLS-mutant rescue, virion production assays","pmids":["36314819"],"confidence":"High","gaps":["Trigger and machinery for WTAP cytoplasmic relocalization not defined","Whether cytoplasmic complex is identical to nuclear MTC unknown"]},{"year":2022,"claim":"Expanded WTAP's regulatory repertoire to non-canonical RNA processing, showing it partners with the microprocessor component DGCR8 to accelerate m6A-dependent pri-miRNA maturation (miR-181, miR-29b, miR-200, miR-92b) read out by YTHDC1.","evidence":"Co-IP (WTAP-DGCR8), MeRIP, RIP, luciferase, differentiation/glycolysis assays, in vivo models","pmids":["36650131","37010483","35733918","37563688"],"confidence":"Medium","gaps":["Direct vs indirect WTAP-DGCR8 association not reconstituted","Each axis from a single lab/disease context"]},{"year":2022,"claim":"Identified circRNA-mediated regulation of complex assembly, with circ0008399 promoting and circPDE5A blocking WTAP-dependent m6A on specific target mRNAs, adding a layer of post-transcriptional control over WTAP activity.","evidence":"RNA pulldown, RIP, MeRIP, Co-IP for complex assembly, functional drug-sensitivity/metastasis assays","pmids":["34702726","35650605"],"confidence":"Medium","gaps":["Binding stoichiometry and structural mode of circRNA-WTAP interaction unknown","Single-lab cancer-specific contexts"]},{"year":2023,"claim":"Defined a second m6A-independent chromatin function: WTAP associates with RNA polymerase II and H3K9ac to maintain proteasome-gene expression, with loss stabilizing GRB2/ERK1/2 to drive hepatocyte proliferation, rescued by PSMB4/PSMB6 restoration.","evidence":"Hepatocyte-specific Wtap KO, ChIP for Pol II and H3K9ac, GRB2/ERK westerns, genetic rescue","pmids":["37777158"],"confidence":"High","gaps":["Mechanism of WTAP-Pol II recruitment to specific promoters unknown","How chromatin vs m6A activity is partitioned in hepatocytes unresolved"]},{"year":2023,"claim":"Established multilayered transcriptional and post-translational control of WTAP abundance and assembly: HIF1α transactivation, PRMT1 methylation of WTAP, and proteasome/mTOR-dependent METTL3 cleavage that licenses WTAP recruitment.","evidence":"HIF1α ChIP, PRMT1 Co-IP/methylation/MeRIP, METTL3a MS identification, Co-IP, mTOR/proteasome inhibition, mutagenesis","pmids":["37087529","37558663","37589705"],"confidence":"High","gaps":["WTAP arginine methylation site and stoichiometry not mapped","Integration of these inputs under physiological conditions untested"]},{"year":2023,"claim":"Linked WTAP abundance to liquid-liquid phase separation, showing NF-κB p65-driven WTAP elevation promotes phase-separated aggregation of the writer complex at nuclear speckles to mark inflammatory transcripts, with myeloid WTAP loss protecting against sepsis and colitis.","evidence":"Myeloid-specific Wtap KO, p65 ChIP, phase separation assay, m6A-seq, LPS and DSS models","pmids":["39007267"],"confidence":"High","gaps":["Domains and determinants of WTAP phase separation not mapped","Quantitative link between condensate formation and catalytic output not established"]},{"year":2025,"claim":"Integrated combinatorial PTM control, showing OGT O-GlcNAcylation and USP7 de-ubiquitination synergistically stabilize WTAP in glioblastoma to drive an IGF2BP2-dependent LOXL2 m6A program promoting immune evasion.","evidence":"MS for O-GlcNAc sites, Co-IP (WTAP-USP7, WTAP-OGT), IGF2BP2 RIP, MeRIP, integrin signaling, scRNA-seq","pmids":["39671515"],"confidence":"Medium","gaps":["Crosstalk hierarchy between O-GlcNAcylation, ubiquitination, and phosphorylation unresolved","Single tumor context"]},{"year":null,"claim":"How a single regulatory subunit switches between recruiting the m6A writer complex and acting directly on chromatin, and what tissue- and signal-specific cues select among its phosphorylation, methylation, O-GlcNAcylation, ubiquitination, and phase-separation states, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model linking PTM state to nuclear/cytoplasmic/chromatin localization","Determinants of m6A-dependent vs m6A-independent mode not defined","Direct vs indirect nature of many reported target interactions not reconstituted in vitro"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0,1,3,5,33]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,13,14]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,33]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,7]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[10,22]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[10,22,23]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[0,22]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,11,22]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[11,22]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[10,23]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,33]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,3,6,7]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,32,38]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[10,22,23]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[3,7,8]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,7,31,36]}],"complexes":["m6A methyltransferase complex (METTL3-METTL14-WTAP)"],"partners":["METTL3","METTL14","DGCR8","USP7","OGT","PRMT1","RNA POLYMERASE II","HDAC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15007","full_name":"Pre-mRNA-splicing regulator WTAP","aliases":["Female-lethal(2)D homolog","hFL(2)D","WT1-associated protein","Wilms tumor 1-associating protein"],"length_aa":396,"mass_kda":44.2,"function":"Associated component of the WMM complex, a complex that mediates N6-methyladenosine (m6A) methylation of RNAs, a modification that plays a role in the efficiency of mRNA splicing and RNA processing (PubMed:29507755). Required for accumulation of METTL3 and METTL14 to nuclear speckle (PubMed:24316715, PubMed:24407421, PubMed:24981863). Acts as a mRNA splicing regulator (PubMed:12444081). Regulates G2/M cell-cycle transition by binding to the 3' UTR of CCNA2, which enhances its stability (PubMed:17088532). Impairs WT1 DNA-binding ability and inhibits expression of WT1 target genes (PubMed:17095724)","subcellular_location":"Nucleus speckle; Nucleus, nucleoplasm; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q15007/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/WTAP","classification":"Common Essential","n_dependent_lines":855,"n_total_lines":1208,"dependency_fraction":0.7077814569536424},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CPSF6","stoichiometry":0.2},{"gene":"DDX39B","stoichiometry":0.2},{"gene":"RBM15B","stoichiometry":0.2},{"gene":"RNF40","stoichiometry":0.2},{"gene":"SSRP1","stoichiometry":0.2},{"gene":"TOP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/WTAP","total_profiled":1310},"omim":[{"mim_id":"621546","title":"TETRATRICOPEPTIDE REPEAT DOMAIN-CONTAINING PROTEIN 22; TTC22","url":"https://www.omim.org/entry/621546"},{"mim_id":"616504","title":"METHYLTRANSFERASE 14, N6-ADENOSINE-METHYLTRANSFERASE SUBUNIT; METTL14","url":"https://www.omim.org/entry/616504"},{"mim_id":"616453","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 13; ZC3H13","url":"https://www.omim.org/entry/616453"},{"mim_id":"616447","title":"VIR-LIKE M6A METHYLTRANSFERASE-ASSOCIATED PROTEIN; VIRMA","url":"https://www.omim.org/entry/616447"},{"mim_id":"612588","title":"BCL2-ASSOCIATED TRANSCRIPTION FACTOR 1; BCLAF1","url":"https://www.omim.org/entry/612588"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nuclear speckles","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/WTAP"},"hgnc":{"alias_symbol":["KIAA0105","MGC3925","Mum2"],"prev_symbol":[]},"alphafold":{"accession":"Q15007","domains":[{"cath_id":"1.20.5","chopping":"15-100","consensus_level":"high","plddt":90.8821,"start":15,"end":100},{"cath_id":"1.20.5","chopping":"147-174","consensus_level":"medium","plddt":86.1468,"start":147,"end":174},{"cath_id":"1.20.5","chopping":"178-240","consensus_level":"medium","plddt":94.5295,"start":178,"end":240}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15007","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15007-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15007-F1-predicted_aligned_error_v6.png","plddt_mean":71.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WTAP","jax_strain_url":"https://www.jax.org/strain/search?query=WTAP"},"sequence":{"accession":"Q15007","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15007.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15007/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15007"}},"corpus_meta":[{"pmid":"24407421","id":"PMC_24407421","title":"Mammalian 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death","url":"https://pubmed.ncbi.nlm.nih.gov/36719469","citation_count":63,"is_preprint":false},{"pmid":"35650605","id":"PMC_35650605","title":"circPDE5A regulates prostate cancer metastasis via controlling WTAP-dependent N6-methyladenisine methylation of EIF3C mRNA.","date":"2022","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/35650605","citation_count":60,"is_preprint":false},{"pmid":"38874470","id":"PMC_38874470","title":"WTAP participates in neuronal damage by protein translation of NLRP3 in an m6A-YTHDF1-dependent manner after traumatic brain injury.","date":"2024","source":"International journal of surgery (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/38874470","citation_count":52,"is_preprint":false},{"pmid":"36139062","id":"PMC_36139062","title":"Role of WTAP in Cancer: From Mechanisms to the Therapeutic Potential.","date":"2022","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/36139062","citation_count":48,"is_preprint":false},{"pmid":"18224709","id":"PMC_18224709","title":"Wtap is required for differentiation of endoderm and mesoderm in the mouse embryo.","date":"2008","source":"Developmental dynamics : an official publication of the American Association of Anatomists","url":"https://pubmed.ncbi.nlm.nih.gov/18224709","citation_count":47,"is_preprint":false},{"pmid":"33053361","id":"PMC_33053361","title":"WTAP Function in Sertoli Cells Is Essential for Sustaining the Spermatogonial Stem Cell Niche.","date":"2020","source":"Stem cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/33053361","citation_count":45,"is_preprint":false},{"pmid":"33559954","id":"PMC_33559954","title":"WTAP facilitates progression of endometrial cancer via CAV-1/NF-κB axis.","date":"2021","source":"Cell biology 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In the absence of WTAP, the RNA-binding capability of METTL3 is strongly reduced, indicating WTAP regulates recruitment of the complex to mRNA targets.\",\n      \"method\": \"Co-immunoprecipitation, PAR-CLIP, nuclear speckle localization experiments, knockdown studies, transcriptomic analyses, zebrafish morpholino knockdown\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, PAR-CLIP, functional KD in cell lines and in vivo zebrafish, multiple orthogonal methods; widely replicated across subsequent studies\",\n      \"pmids\": [\"24407421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Recombinant protein mapping defined binding surfaces within the METTL3/METTL14-WTAP complex; nuclear localization signals were identified on each subunit; phosphorylation sites were identified on the endogenous proteins. Monomeric METTL3 is soluble but inactive, and the catalytic center of METTL14 is degenerate and inactive; the C-terminal RGG repeats of METTL14 contribute to RNA substrate binding and are required for METTL3/14 activity.\",\n      \"method\": \"Recombinant protein binding surface mapping, in vitro methylation assay, mutagenesis of RGG repeats, phosphorylation site identification on endogenous proteins\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution, mutagenesis, and binding surface mapping with recombinant proteins in a single rigorous study\",\n      \"pmids\": [\"29348140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Both knockdown and overexpression of METTL3 results in upregulation of WTAP protein, demonstrating that METTL3 levels are critical for WTAP protein homeostasis. WTAP upregulation alone is not sufficient to promote cell proliferation in the absence of functional METTL3, indicating WTAP's oncogenic function is strictly dependent on a functional m6A methylation complex.\",\n      \"method\": \"METTL3 knockdown and overexpression, western blot, cell proliferation assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD and OE experiments with defined molecular readout, single lab, two complementary perturbations\",\n      \"pmids\": [\"30038300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The WTAP-METTL3-METTL14 RNA N6-adenosine methyltransferase complex positively controls adipogenesis by promoting cell cycle transition during mitotic clonal expansion (MCE). Knockdown of WTAP (or METTL3/METTL14) leads to cell cycle arrest and impaired adipogenesis associated with suppression of cyclin A2 upregulation. Wtap heterozygous knockout mice are protected from diet-induced obesity with smaller, fewer adipocytes and improved insulin sensitivity.\",\n      \"method\": \"siRNA knockdown of WTAP/METTL3/METTL14, cell cycle analysis, adipogenesis assays, Wtap heterozygous knockout mouse model, diet-induced obesity model\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KD with defined phenotypic readout in vitro and KO mouse model in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"29866655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Wtap is essential for differentiation of endoderm and mesoderm during mouse embryogenesis. Wtap gene-trap mutant embryos fail to form endoderm and mesoderm, die by E10.5, and Wtap mutant embryonic stem cells fail to differentiate into these lineages. Chimera analysis showed Wtap function in extraembryonic tissues is required for mesoderm/endoderm formation in embryonic tissues.\",\n      \"method\": \"Gene-trap mouse knockout, chimera analysis, embryonic stem cell differentiation assays\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function in vivo with defined developmental phenotype, chimera analysis providing cell-autonomous/non-autonomous distinction\",\n      \"pmids\": [\"18224709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WTAP regulates TCR signaling, thymocyte differentiation, activation-induced death of peripheral T cells, and gut RORγt+ regulatory T cell function. Transcriptome and epitranscriptomic analyses showed that m6A modification destabilizes Orai1 and Ripk1 mRNAs; loss of this post-transcriptional repression correlates with increased store-operated calcium entry and diminished T cell survival in Wtap conditional knockout mice.\",\n      \"method\": \"Conditional genetic inactivation of Wtap in T cells, transcriptome/MeRIP-seq analyses, calcium entry assays, T cell phenotyping\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse with defined signaling phenotype and MeRIP-seq identification of direct mRNA targets, multiple orthogonal methods\",\n      \"pmids\": [\"35879451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Conditional deletion of Wtap in Sertoli cells results in sterility and progressive loss of spermatogonial stem cell (SSC) population. m6A sequencing identified 21,909 m6A sites across 6,122 genes in Sertoli cells. Wtap deletion sharply alters alternative splicing of transcripts encoding SSC niche factors and severely dysregulates their translation.\",\n      \"method\": \"Conditional Wtap knockout in Sertoli cells, m6A sequencing, RNA sequencing, ribosome nascent-chain complex-bound mRNA sequencing\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined in vivo phenotype and multiple transcriptomic/epitranscriptomic methods\",\n      \"pmids\": [\"33053361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP is required for postnatal development and maturation of brown adipose tissue (BAT). BAT-specific knockout of Wtap impairs maturation and causes whitening of interscapular BAT, hypothermia, and cold intolerance. Mechanistically, WTAP deficiency decreases m6A mRNA modification by reducing the protein stability of METTL3; BAT-specific overexpression of Mettl3 partially rescues the phenotypes.\",\n      \"method\": \"BAT-specific Wtap knockout, phenotypic analysis (cold challenge, thermogenesis), western blot for METTL3 protein stability, Mettl3 overexpression rescue, single nucleus RNA-seq\",\n      \"journal\": \"Life metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO with defined in vivo phenotype and genetic rescue experiment establishing epistasis (WTAP → METTL3 stability)\",\n      \"pmids\": [\"39872074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP is required for maintaining islet beta cell function; beta cell-specific deletion of Wtap induces severe hyperglycemia, beta cell failure, and diabetes. WTAP deficiency decreases m6A mRNA modification and reduces expression of beta cell-specific transcription factors and insulin secretion-related genes by reducing METTL3 protein levels. Beta cell-specific overexpression of Mettl3 partially reverses these abnormalities.\",\n      \"method\": \"Beta cell-specific Wtap knockout, Mettl3 overexpression rescue, glucose tolerance/GSIS assays, RNA-seq, MeRIP-seq\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO and genetic rescue establishing WTAP→METTL3 mechanism, supported by MeRIP-seq; multiple orthogonal methods\",\n      \"pmids\": [\"36920524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of Wtap in Purkinje cells causes early-onset cerebellar ataxia, cerebellar atrophy, extensive Purkinje cell degeneration and apoptosis, and aberrant degradation of PC synapses. WTAP depletion decreases METTL3/14 protein levels and reduces m6A methylation in Purkinje cells.\",\n      \"method\": \"Purkinje cell-specific Wtap knockout, behavioral ataxia testing, histological analysis, western blot for METTL3/14, m6A methylation quantification\",\n      \"journal\": \"Journal of genetics and genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific KO with defined in vivo neurological phenotype and mechanistic molecular readouts, single lab\",\n      \"pmids\": [\"35304325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP deficiency in cardiomyocytes induces dilated cardiomyopathy and heart failure. Unlike in other tissues, WTAP deficiency in the heart decreases chromatin accessibility at promoters of Mef2a and Mef2c, reducing their expression. WTAP directly binds to the Mef2c gene promoter and increases its promoter activity (demonstrated by luciferase assay). Cardiomyocyte-specific overexpression of Mettl3 does not rescue the phenotypes, indicating this cardiac function is m6A-independent.\",\n      \"method\": \"Cardiomyocyte-specific Wtap knockout, Mettl3 overexpression rescue experiment (negative result for rescue), chromatin accessibility assay (ATAC-seq), luciferase promoter assay, ChIP\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO, failed METTL3 rescue establishing m6A-independent mechanism, luciferase assay for direct promoter binding, multiple orthogonal methods\",\n      \"pmids\": [\"38224851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"During HCV infection, WTAP (normally a predominantly nuclear protein) is relocalized to the cytoplasm. WTAP is required for both METTL3 interaction with HCV RNA and m6A modification across the viral RNA genome in the cytoplasm. WTAP, METTL3, and METTL14 negatively regulate production of infectious HCV virions. WTAP's regulation of HCV RNA m6A modification and virion production is independent of its nuclear localization.\",\n      \"method\": \"Subcellular fractionation, RIP with HCV RNA, m6A sequencing of viral RNA, WTAP knockdown/rescue with nuclear-localization mutants, infectious virus production assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — localization experiment with functional consequence, RIP, nuclear-localization mutant rescue establishing localization-function relationship, multiple orthogonal methods\",\n      \"pmids\": [\"36314819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WTAP-mediated m6A modification of ETS1 mRNA leads to post-transcriptional suppression of ETS1 with involvement of HuR as an RNA stabilizer. WTAP promotes HCC cell proliferation and G2/M cell cycle arrest through the HuR-ETS1-p21/p27 axis.\",\n      \"method\": \"m6A dot blot, MeRIP assay, RNA immunoprecipitation (RIP) assay, dual luciferase reporter assay, ChIP assay, RNA-seq, WTAP knockdown/overexpression\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (MeRIP, RIP, luciferase) in single lab identifying mechanistic axis\",\n      \"pmids\": [\"31438961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"circ0008399 binds WTAP protein to promote formation of the WTAP/METTL3/METTL14 m6A methyltransferase complex, increasing its assembly and activity and promoting m6A-dependent stabilization of TNFAIP3 mRNA, thereby reducing cisplatin sensitivity in bladder cancer.\",\n      \"method\": \"RNA pulldown, RIP assay, MeRIP assay, Co-IP for complex assembly, functional cisplatin sensitivity assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pulldown and RIP establish binding, functional assays show consequence; single lab with multiple methods but no in vitro reconstitution\",\n      \"pmids\": [\"34702726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"circPDE5A forms a complex with WTAP (verified by RNA pulldown and RIP) and blocks WTAP-dependent m6A methylation of EIF3C mRNA, disrupting EIF3C translation and inactivating the MAPK pathway to restrain prostate cancer metastasis.\",\n      \"method\": \"RNA pulldown followed by mass spectrometry, RIP, MeRIP-seq, in vitro and in vivo functional assays\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pulldown+MS and RIP establish interaction, MeRIP-seq shows downstream effect; single lab\",\n      \"pmids\": [\"35650605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WTAP promotes m6A modification of NLRP3 mRNA to upregulate NLRP3 inflammasome activation, leading to cell pyroptosis and inflammation in diabetic nephropathy. WTAP-mediated m6A stabilization of NLRP3 mRNA is recognized by IGF2BP1. Histone acetyltransferase p300 regulates WTAP expression upstream.\",\n      \"method\": \"WTAP knockdown/overexpression, MeRIP assay, RIP assay, m6A dot blot, IGF2BP1 RIP, p300 inhibitor (C646) treatment\",\n      \"journal\": \"Cellular & molecular biology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MeRIP, RIP, functional assays in cells and db/db mice; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"35761192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP-mediated m6A modification of lncRNA DIAPH1-AS1 enhances its stability through the m6A reader IGF2BP2. DIAPH1-AS1 acts as a molecular adaptor promoting MTDH-LASP1 complex formation and LASP1 upregulation, facilitating NPC growth and metastasis. KAT3A-mediated H3K27 acetylation fine-tunes WTAP expression in NPC.\",\n      \"method\": \"MeRIP assay, RIP assay, IGF2BP2 binding assay, Co-IP (MTDH-LASP1), ChIP for H3K27ac, WTAP knockdown/overexpression\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple binding and modification assays in single lab; direct m6A-stability mechanism established but downstream complex characterization partially indirect\",\n      \"pmids\": [\"34999731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP increases in senescent nucleus pulposus cells due to KDM5a-mediated epigenetic increase in H3K4me3 at the WTAP promoter. WTAP promotes m6A modification of lncRNA NORAD, leading to YTHDF2-mediated decay of NORAD. Reduced NORAD leads to less sequestration of PUMILIO proteins, augmenting PUM1/2 activity and repressing E2F3 mRNA, promoting cellular senescence and IVDD.\",\n      \"method\": \"m6A sequencing (m6A-seq), gain/loss-of-function experiments, ChIP for H3K4me3, MeRIP, YTHDF2 RIP, functional senescence assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m6A-seq + ChIP + MeRIP + functional assays in single lab; pathway epistasis established through multiple complementary methods\",\n      \"pmids\": [\"35304463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"C5aR1-positive neutrophil-secreted IL1β and TNFα cooperatively activate ERK1/2 signaling, which phosphorylates WTAP at serine 341, stabilizing the WTAP protein. Stabilized WTAP then promotes m6A methylation of ENO1 mRNA, increasing ENO1 expression and breast cancer cell glycolysis.\",\n      \"method\": \"ERK1/2 inhibition, phosphorylation site identification (S341), western blot for WTAP stability, MeRIP for ENO1 m6A, glycolysis assays, WTAP silencing in vivo\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — phosphorylation site identified, MeRIP confirms m6A on ENO1, functional in vitro and in vivo; single lab, specific phospho-site not validated by mutagenesis in abstract\",\n      \"pmids\": [\"34312368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP promotes m6A modification of NORAD lncRNA and pri-miRNA processing: WTAP-mediated m6A modification of pri-miR-181a and pri-miR-181c is recognized by YTHDC1, increasing maturation to miR-181a/c. These miRNAs inhibit SFRP1 mRNA, promoting osteogenic differentiation of BMSCs via activation of Wnt signaling.\",\n      \"method\": \"Co-IP, RIP, MeRIP, RNA pulldown, dual-luciferase assay, ALP activity, Alizarin Red staining, micro-CT\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple binding assays and functional differentiation readouts in single lab; YTHDC1 recognition of m6A-modified pri-miRNA established by RIP/Co-IP\",\n      \"pmids\": [\"36650131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP mediates m6A modification of ATF4 mRNA, regulating its expression, and thereby promotes endoplasmic reticulum stress and apoptosis in cardiomyocytes during hypoxia/reoxygenation. WTAP expression is time-dependently increased by H/R. The inhibitory effects of WTAP on ER stress and apoptosis are ATF4-dependent.\",\n      \"method\": \"WTAP knockdown/overexpression, MeRIP for ATF4 m6A, ER stress inhibitor (4-PBA) rescue, in vivo I/R model\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MeRIP + functional rescue + in vivo confirmation; single lab\",\n      \"pmids\": [\"33819187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP mediates m6A modification of FOXO3a mRNA through the m6A reader YTHDF1, enhancing FOXO3a mRNA stability and expression. This WTAP/YTHDF1/m6A/FOXO3a axis regulates myocardial I/R injury progression.\",\n      \"method\": \"MeRIP-seq identifying m6A site in 3'-UTR of FOXO3a, YTHDF1 RIP, RNA stability assay, WTAP knockdown in H9C2 cells and I/R rat model\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MeRIP-seq + reader RIP + functional assays; single lab\",\n      \"pmids\": [\"36894806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP deficiency in hepatocytes causes NASH by increasing lipolysis in white adipose tissue, enhancing hepatic free fatty acid uptake, and inducing inflammation. Mechanistically, WTAP binds specific DNA motifs in promoters and suppresses gene expression (Igfbp1, Cd36, Ccl2) with involvement of HDAC1. In NASH, CDK9-mediated phosphorylation of WTAP causes its translocation from nucleus to cytosol.\",\n      \"method\": \"Hepatocyte-specific Wtap knockout, ChIP for WTAP-DNA binding and HDAC1, CDK9 inhibitor/kinase assay, subcellular fractionation, gene expression profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — hepatocyte-specific KO, ChIP establishing direct DNA binding, CDK9-mediated phosphorylation and nuclear-to-cytoplasmic translocation; multiple orthogonal methods in a single comprehensive study\",\n      \"pmids\": [\"35927268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Hepatic deletion of Wtap promotes HCC progression. WTAP interacts with RNA polymerase II and H3K9ac to maintain expression of proteasome-related genes (Psmb4, Psmb6). WTAP deficiency decreases proteasome gene expression, increasing protein stability of GRB2 and ERK1/2, thereby activating the ERK signaling pathway and increasing hepatocyte proliferation.\",\n      \"method\": \"Hepatocyte-specific Wtap knockout, ChIP for RNA Pol II and H3K9ac at proteasome gene promoters, western blot for GRB2/ERK stability, PSMB4/PSMB6 restoration rescue experiments\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO, ChIP establishing direct chromatin interaction, genetic rescue with PSMB4/PSMB6 restoring GRB2/ERK levels; multiple orthogonal methods\",\n      \"pmids\": [\"37777158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PRMT1 methylates WTAP protein; this methylation is required for WTAP-dependent m6A modification of NDUFS6 mRNA. PRMT1 knockdown reduces OXPHOS in multiple myeloma cells through NDUFS6 downregulation, and this is mediated via WTAP.\",\n      \"method\": \"Co-IP to identify WTAP-PRMT1 interaction, methylation assay, MeRIP for NDUFS6 m6A, PRMT1 knockdown/overexpression, in vitro and in vivo functional assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP establishes interaction, functional methylation consequence shown; specific arginine site of WTAP methylation not detailed in abstract, single lab\",\n      \"pmids\": [\"37558663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HIF1α directly binds the hypoxia-response element of the WTAP gene promoter and transactivates WTAP expression in t(8;21) AML. Elevated WTAP increases m6A modification of KDM4B transcripts, promoting their translation; this drives crosstalk between m6A RNA methylation and histone H3K9 trimethylation.\",\n      \"method\": \"ChIP (HIF1α binding to WTAP HRE), m6A profiling (transcriptome-wide), KDM4B knockdown, pharmacological/genetic HIF1α intervention, in vitro and in vivo AML models\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms direct promoter binding, m6A profiling + KDM4B functional data; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37087529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TTC22 directly interacts with the 60S ribosomal protein RPL4, which promotes binding of WTAP mRNA to RPL4 and enhances WTAP mRNA stability and translation efficiency. WTAP mRNA is itself an m6A target recognized by YTHDF1, and TTC22 triggers a positive feedback loop between WTAP protein expression and WTAP mRNA m6A modification.\",\n      \"method\": \"Co-IP (TTC22-RPL4), RIP (YTHDF1-WTAP mRNA), m6A MeRIP, WTAP mRNA stability assay, YTHDF1 knockdown, luciferase reporter\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and RIP establish interactions, mRNA stability and luciferase assays show functional consequence; single lab\",\n      \"pmids\": [\"35798874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP-mediated m6A modification of WTAP's target mRNAs promotes maturation of pri-miR-92b to miR-92b-5p in an m6A-dependent manner; m6A modification also directly facilitates YTHDF2-dependent degradation of TIMP4 mRNAs. Both mechanisms contribute to OA progression.\",\n      \"method\": \"MeRIP, RIP for DGCR8 (microprocessor) and YTHDF2, pri-miRNA processing assay, WTAP knockdown/overexpression, DMM mouse model\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MeRIP + RIP for two distinct mechanistic arms; single lab with multiple methods\",\n      \"pmids\": [\"37563688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP interacts with DGCR8 (microprocessor component) and accelerates maturation of pri-miR-29b-3p in an m6A-dependent manner, increasing miR-29b-3p levels, which inhibit HDAC4 expression to promote osteogenic and inhibit adipogenic differentiation of BMSCs.\",\n      \"method\": \"Co-IP (WTAP-DGCR8), MeRIP for pri-miR-29b, dual-luciferase (miR-29b-3p binding to HDAC4), differentiation assays, in vivo mouse model\",\n      \"journal\": \"Stem cells translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP + MeRIP + luciferase + functional differentiation assays; single lab\",\n      \"pmids\": [\"37010483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP interacts with DGCR8 to regulate microRNA-200 processing in an m6A-dependent way; miR-200 positively regulates glycolysis enzyme HK2, accelerating the Warburg effect in ovarian cancer. WTAP expression is positively regulated by HIF-1α under hypoxia.\",\n      \"method\": \"Co-IP (WTAP-DGCR8), MeRIP for pri-miR-200 m6A, functional glycolysis assays, HIF-1α knockdown/OE, WTAP KD/OE\",\n      \"journal\": \"Journal of immunology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP + MeRIP + functional assays; single lab; HIF-1α regulation of WTAP shown by KD/OE without detailed promoter mechanism\",\n      \"pmids\": [\"35733918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"WTAP affects SUV39H1 mRNA m6A methylation, reducing H3K9me3 enrichment at the CCL2 promoter, thereby promoting CCL2 secretion and macrophage recruitment during corneal neovascularization. Separately, WTAP regulates translational efficiency of HIF-1α via m6A modification.\",\n      \"method\": \"MeRIP (SUV39H1 mRNA), ChIP (H3K9me3 at CCL2 promoter), WTAP knockdown/AAV overexpression in vivo, tube formation assay\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MeRIP + ChIP establishing epigenetic cascade; functional in vivo confirmation; single lab\",\n      \"pmids\": [\"37019244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"EP3 receptor activation prevents ubiquitin-mediated proteasomal degradation of WTAP by eliminating PKA-mediated ERK1/2 inhibition during brown adipocyte differentiation, thereby stabilizing WTAP protein. Stabilized WTAP then mediates m6A modification of Zfp410 mRNA, stabilizing it and promoting brown adipogenesis.\",\n      \"method\": \"EP3 knockout mouse, brown adipocyte-specific WTAP KO, ubiquitination assay, PKA inhibition, ERK1/2 phosphorylation analysis, MeRIP (Zfp410), in vivo BAT formation assay\",\n      \"journal\": \"EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse models, ubiquitination assay establishing degradation mechanism, PKA/ERK epistasis, MeRIP for downstream target; multiple orthogonal methods in single comprehensive study\",\n      \"pmids\": [\"35781818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"p65 (NF-κB subunit) transcriptionally regulates WTAP expression; elevated WTAP is more prone to phase separation, facilitating aggregation of the m6A writer complex to nuclear speckles and deposition of m6A marks on inflammatory transcripts, accelerating proinflammatory responses. Myeloid-specific WTAP deficiency attenuates LPS-induced sepsis and DSS-induced IBD.\",\n      \"method\": \"Myeloid-specific Wtap KO mouse, p65 ChIP on WTAP promoter, phase separation assay, m6A sequencing, functional inflammatory models (LPS sepsis, DSS colitis)\",\n      \"journal\": \"Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO, ChIP establishing transcriptional regulation, phase separation assay, multiple in vivo inflammatory models, m6A sequencing\",\n      \"pmids\": [\"39007267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A cleaved form of METTL3 (METTL3a, residues 239-580) is required for the METTL3-WTAP interaction. METTL3a is essential for the METTL3-METTL3 interaction, which is a prerequisite step for recruitment of WTAP into the MTC. METTL3 cleavage is mediated by the proteasome in an mTOR-dependent manner, revealing positive regulatory feedback.\",\n      \"method\": \"Identification of METTL3a by mass spectrometry, Co-IP (METTL3a-WTAP, METTL3-METTL3), m6A sequencing, mTOR inhibition, proteasome inhibition, mutagenesis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with mutagenesis, MS-based identification of cleaved form, m6A sequencing, pharmacological rescue; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"37589705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"WTAP-mediated m6A modification of AR (androgen receptor) mRNA induces its degradation in a YTHDF2-dependent manner. AR directly interacts with mitochondrial lipid oxidation enzyme Decr1; AR overexpression suppresses Decr1-mediated mitochondrial lipid oxidation, inhibiting cardiac fibroblast proliferation and migration. WTAP thus promotes diabetic cardiac fibrosis by boosting mitochondrial lipid oxidation through AR methylation.\",\n      \"method\": \"MeRIP for AR m6A, YTHDF2 RIP/KD, Co-IP (AR-Decr1), mitochondrial lipid oxidation assay, cardiac fibroblast functional assays, human DCM tissue analysis\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MeRIP + YTHDF2 RIP/KD + Co-IP + functional assays; single lab with multiple methods but no in vitro reconstitution\",\n      \"pmids\": [\"37810250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"WTAP mediates m6A modification of TNFAIP3 mRNA and ENO1 mRNA (m6A-dependent stabilization), VEGFA mRNA (promoting MAPK signaling via YTHDC1 as reader), and promotes cancer glycolysis; WTAP mediates m6A modification of FOXP3 mRNA (stabilized via YTHDF1); multiple cancer-specific targets established.\",\n      \"method\": \"MeRIP-seq + RNA-seq, YTHDC1/YTHDF1 RIP, tube formation assay, WTAP KD/OE in CRC cells\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MeRIP-seq + reader RIP identify specific targets; functional assays in single lab\",\n      \"pmids\": [\"37428639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"OGT-mediated O-GlcNAcylation and USP7-mediated de-ubiquitination synergistically enhance WTAP protein stability in GBM. Stabilized WTAP promotes LOXL2 mRNA m6A modification, enhancing its stability via IGF2BP2 and increasing secreted LOXL2 (sLOXL2). sLOXL2 activates integrin α5β1-FAK-ERK signaling in GSCs (mesenchymal transition) and in MDMs (M2 polarization), promoting immune evasion.\",\n      \"method\": \"Mass spectrometry (O-GlcNAcylation sites), Co-IP (WTAP-USP7, WTAP-OGT), RIP (IGF2BP2-LOXL2), MeRIP, integrin signaling pathway analysis, single-cell RNA-seq\",\n      \"journal\": \"Neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MS identification of PTM + Co-IP + RIP + MeRIP + functional pathway analysis; single lab\",\n      \"pmids\": [\"39671515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WTAP knockdown in porcine parthenogenetic zygotes significantly reduces blastocyst rate and global m6A levels without affecting cleavage rate, and downregulates pluripotency genes (OCT4, SOX2, NANOG) while upregulating apoptotic genes (BAX, CASPASE3), demonstrating WTAP is required for early embryonic development through m6A modification.\",\n      \"method\": \"Microinjection of si-WTAP into porcine zygotes, m6A quantification, TUNEL staining, qPCR for pluripotency/apoptosis genes\",\n      \"journal\": \"Animals\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean loss-of-function in zygotes with defined developmental and molecular phenotype; single species/lab\",\n      \"pmids\": [\"34199793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WTAP directly acts on NLRP3 mRNA, regulates its m6A level, and promotes NLRP3 protein expression after neuronal injury via YTHDF1. YTHDF1 directly binds NLRP3 mRNA and regulates NLRP3 protein translation. Conditional neuron-specific Wtap knockout suppresses neuroinflammation after TBI.\",\n      \"method\": \"Conditional Wtap knockout (flox/flox, Camk2a-cre), AAV-shYTHDF1, RIP (YTHDF1-NLRP3 mRNA), MeRIP (NLRP3 m6A), neurological function assays\",\n      \"journal\": \"International journal of surgery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO + RIP + MeRIP + YTHDF1 knockdown with functional rescue; single lab\",\n      \"pmids\": [\"38874470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IFN-γ activates ERK signaling in MSCs, inducing WTAP phosphorylation and stabilizing WTAP post-transcriptionally. Stabilized WTAP increases m6A modification and mRNA stability of immunosuppressive molecules (IDO1, PD-L1, ICAM1, VCAM1) in a YTHDF1-dependent manner, amplifying the immunosuppressive capacity of IFN-γ-licensed MSCs.\",\n      \"method\": \"Epitranscriptomic microarray, MeRIP-qPCR, RIP-qPCR, RNA stability assay, ERK inhibition, western blot, functional T cell suppression assay, DSS colitis and CIA in vivo models\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MeRIP + RIP + RNA stability + functional in vivo assays; ERK-WTAP phosphorylation cascade established; single lab\",\n      \"pmids\": [\"38944238\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WTAP is an essential regulatory (non-catalytic) subunit of the nuclear m6A methyltransferase complex (with METTL3 and METTL14) that recruits the complex to target mRNAs, is required for METTL3/14 localization to nuclear speckles and catalytic activity, and regulates a broad spectrum of biological processes—including embryogenesis, T cell signaling, adipogenesis, neuronal function, cardiac development, and immune responses—through m6A-dependent stabilization or destabilization of specific mRNAs via reader proteins (YTHDF1/2, YTHDC1, IGF2BPs); additionally, WTAP itself is post-translationally regulated by phosphorylation (ERK1/2, CDK9), O-GlcNAcylation (OGT), ubiquitination/de-ubiquitination (USP7), and proteasomal degradation, which modulate its nuclear localization and protein stability, and in some cellular contexts (notably cardiomyocytes) WTAP exerts m6A-independent functions by directly binding chromatin to regulate transcription.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"WTAP is an essential, non-catalytic regulatory subunit of the nuclear m6A methyltransferase complex, where it interacts with METTL3 and METTL14, drives their localization to nuclear speckles, and is required for catalytic m6A deposition in vivo by enabling complex recruitment to mRNA targets [#0]. The complex is built through ordered assembly in which a cleaved form of METTL3 (METTL3a) mediates METTL3-METTL3 interaction as a prerequisite for WTAP recruitment, while METTL14 provides RNA-substrate binding through its C-terminal RGG repeats [#1, #33]. WTAP and METTL3 are mutually dependent for protein homeostasis, and in several tissues WTAP loss destabilizes METTL3/14 such that Mettl3 re-expression rescues the phenotype, establishing WTAP as an upstream stabilizer of the writer machinery [#2, #7, #8]. Through m6A deposition read out by YTHDF1/2, YTHDC1, and IGF2BPs, WTAP controls the stability, translation, splicing, and miRNA processing of defined transcripts to govern embryonic differentiation, adipogenesis, spermatogenesis, T-cell and innate immune signaling, and neuronal and cardiac homeostasis [#3, #4, #5, #6, #9, #32]. WTAP itself is a regulatory hub: its protein stability and nuclear localization are tuned by ERK1/2- and CDK9-mediated phosphorylation, OGT O-GlcNAcylation, USP7 de-ubiquitination, and proteasomal degradation, and its abundance is set transcriptionally by HIF1\\u03b1, NF-\\u03baB p65, p300, and chromatin modifiers [#18, #22, #31, #32, #36]. Beyond its canonical m6A role, WTAP also acts m6A-independently in some contexts by binding chromatin directly\\u2014activating Mef2c promoter activity in cardiomyocytes and associating with RNA polymerase II to maintain proteasome-gene expression in hepatocytes [#10, #22, #23].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established WTAP as a developmentally essential gene before its molecular function was known, defining the biological stakes of its later-characterized activity.\",\n      \"evidence\": \"Gene-trap knockout and chimera analysis in mouse embryos and ES cells\",\n      \"pmids\": [\"18224709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of the differentiation block not defined at this stage\", \"No link to m6A yet established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined WTAP's core molecular function: a regulatory subunit that recruits METTL3/METTL14 to mRNA and is required for nuclear-speckle localization and catalytic m6A activity, explaining its essentiality.\",\n      \"evidence\": \"Co-IP, PAR-CLIP, speckle localization, knockdown, transcriptomics, zebrafish morpholino\",\n      \"pmids\": [\"24407421\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve assembly order of the complex\", \"Direct mRNA-recruitment mechanism inferred from reduced METTL3 RNA binding, not structurally defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved the architecture and catalytic logic of the writer complex, showing METTL3 is the active subunit, METTL14 is catalytically degenerate but contributes RNA binding via RGG repeats, and mapping WTAP binding surfaces and phosphosites.\",\n      \"evidence\": \"Recombinant binding-surface mapping, in vitro methylation, RGG mutagenesis, phosphosite identification\",\n      \"pmids\": [\"29348140\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of mapped WTAP phosphosites not tested\", \"WTAP's precise structural contribution to activity not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed WTAP and METTL3 are mutually dependent for protein homeostasis and that WTAP's oncogenic activity strictly requires a functional methylation complex, and that the complex drives adipogenesis via cell-cycle control in clonal expansion.\",\n      \"evidence\": \"METTL3 KD/OE with western blot and proliferation assays; siRNA KD, Wtap heterozygous KO mice, diet-induced obesity model\",\n      \"pmids\": [\"30038300\", \"29866655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which METTL3 sets WTAP protein levels not defined in 2018\", \"Direct cell-cycle target transcripts not fully enumerated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated tissue-specific requirement for WTAP-dependent m6A in regulating both alternative splicing and translation of niche-factor transcripts during spermatogenesis.\",\n      \"evidence\": \"Conditional Sertoli-cell Wtap KO, m6A-seq, RNA-seq, ribosome-bound mRNA sequencing\",\n      \"pmids\": [\"33053361\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual causal target transcripts not isolated\", \"Reader proteins mediating splicing vs translation effects not assigned\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined direct mRNA targets in T cells, showing m6A destabilization of Orai1 and Ripk1 couples WTAP to calcium signaling and T-cell survival, extending its role to adaptive immunity.\",\n      \"evidence\": \"Conditional Wtap KO in T cells, MeRIP-seq, calcium-entry assays, T-cell phenotyping\",\n      \"pmids\": [\"35879451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reader protein for Orai1/Ripk1 destabilization not specified\", \"Direct vs indirect contribution to Treg function not fully separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Began mapping upstream control of WTAP, showing ERK1/2 phosphorylation at S341 stabilizes the protein in response to inflammatory cytokines, linking the tumor microenvironment to m6A output.\",\n      \"evidence\": \"ERK inhibition, phosphosite identification, WTAP stability western blot, ENO1 MeRIP, glycolysis and in vivo assays\",\n      \"pmids\": [\"34312368\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"S341 not validated by phospho-dead mutagenesis in the report\", \"Single lab/cancer context\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established that WTAP loss destabilizes METTL3/14 protein across multiple tissues, with Mettl3 re-expression rescuing phenotypes, defining WTAP as an upstream stabilizer of the writer complex in brown fat, beta cells, and Purkinje neurons.\",\n      \"evidence\": \"Tissue-specific Wtap KOs, METTL3/14 western blots, Mettl3 overexpression rescue, MeRIP-seq, snRNA-seq\",\n      \"pmids\": [\"39872074\", \"36920524\", \"35304325\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of METTL3/14 destabilization upon WTAP loss not resolved\", \"Why rescue is only partial not explained\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Uncovered m6A-independent chromatin functions of WTAP: direct promoter binding to activate Mef2c in cardiomyocytes (METTL3-non-rescuable) and DNA-motif binding with HDAC1 to repress lipid/inflammatory genes in hepatocytes, where CDK9 phosphorylation drives nuclear-to-cytoplasmic translocation.\",\n      \"evidence\": \"Cardiomyocyte- and hepatocyte-specific Wtap KO, failed Mettl3 rescue, ATAC-seq, ChIP, luciferase, CDK9 kinase assay, subcellular fractionation\",\n      \"pmids\": [\"38224851\", \"35927268\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DNA sequence specificity and structural basis of WTAP chromatin binding undefined\", \"Determinants choosing m6A vs chromatin mode per tissue unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed WTAP relocalizes to the cytoplasm during HCV infection to m6A-modify viral RNA and restrict infectious virion production, demonstrating localization-dependent functional switching independent of nuclear residence.\",\n      \"evidence\": \"Subcellular fractionation, RIP with HCV RNA, viral m6A-seq, NLS-mutant rescue, virion production assays\",\n      \"pmids\": [\"36314819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger and machinery for WTAP cytoplasmic relocalization not defined\", \"Whether cytoplasmic complex is identical to nuclear MTC unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Expanded WTAP's regulatory repertoire to non-canonical RNA processing, showing it partners with the microprocessor component DGCR8 to accelerate m6A-dependent pri-miRNA maturation (miR-181, miR-29b, miR-200, miR-92b) read out by YTHDC1.\",\n      \"evidence\": \"Co-IP (WTAP-DGCR8), MeRIP, RIP, luciferase, differentiation/glycolysis assays, in vivo models\",\n      \"pmids\": [\"36650131\", \"37010483\", \"35733918\", \"37563688\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect WTAP-DGCR8 association not reconstituted\", \"Each axis from a single lab/disease context\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified circRNA-mediated regulation of complex assembly, with circ0008399 promoting and circPDE5A blocking WTAP-dependent m6A on specific target mRNAs, adding a layer of post-transcriptional control over WTAP activity.\",\n      \"evidence\": \"RNA pulldown, RIP, MeRIP, Co-IP for complex assembly, functional drug-sensitivity/metastasis assays\",\n      \"pmids\": [\"34702726\", \"35650605\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding stoichiometry and structural mode of circRNA-WTAP interaction unknown\", \"Single-lab cancer-specific contexts\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a second m6A-independent chromatin function: WTAP associates with RNA polymerase II and H3K9ac to maintain proteasome-gene expression, with loss stabilizing GRB2/ERK1/2 to drive hepatocyte proliferation, rescued by PSMB4/PSMB6 restoration.\",\n      \"evidence\": \"Hepatocyte-specific Wtap KO, ChIP for Pol II and H3K9ac, GRB2/ERK westerns, genetic rescue\",\n      \"pmids\": [\"37777158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of WTAP-Pol II recruitment to specific promoters unknown\", \"How chromatin vs m6A activity is partitioned in hepatocytes unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established multilayered transcriptional and post-translational control of WTAP abundance and assembly: HIF1\\u03b1 transactivation, PRMT1 methylation of WTAP, and proteasome/mTOR-dependent METTL3 cleavage that licenses WTAP recruitment.\",\n      \"evidence\": \"HIF1\\u03b1 ChIP, PRMT1 Co-IP/methylation/MeRIP, METTL3a MS identification, Co-IP, mTOR/proteasome inhibition, mutagenesis\",\n      \"pmids\": [\"37087529\", \"37558663\", \"37589705\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"WTAP arginine methylation site and stoichiometry not mapped\", \"Integration of these inputs under physiological conditions untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked WTAP abundance to liquid-liquid phase separation, showing NF-\\u03baB p65-driven WTAP elevation promotes phase-separated aggregation of the writer complex at nuclear speckles to mark inflammatory transcripts, with myeloid WTAP loss protecting against sepsis and colitis.\",\n      \"evidence\": \"Myeloid-specific Wtap KO, p65 ChIP, phase separation assay, m6A-seq, LPS and DSS models\",\n      \"pmids\": [\"39007267\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domains and determinants of WTAP phase separation not mapped\", \"Quantitative link between condensate formation and catalytic output not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Integrated combinatorial PTM control, showing OGT O-GlcNAcylation and USP7 de-ubiquitination synergistically stabilize WTAP in glioblastoma to drive an IGF2BP2-dependent LOXL2 m6A program promoting immune evasion.\",\n      \"evidence\": \"MS for O-GlcNAc sites, Co-IP (WTAP-USP7, WTAP-OGT), IGF2BP2 RIP, MeRIP, integrin signaling, scRNA-seq\",\n      \"pmids\": [\"39671515\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Crosstalk hierarchy between O-GlcNAcylation, ubiquitination, and phosphorylation unresolved\", \"Single tumor context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single regulatory subunit switches between recruiting the m6A writer complex and acting directly on chromatin, and what tissue- and signal-specific cues select among its phosphorylation, methylation, O-GlcNAcylation, ubiquitination, and phase-separation states, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model linking PTM state to nuclear/cytoplasmic/chromatin localization\", \"Determinants of m6A-dependent vs m6A-independent mode not defined\", \"Direct vs indirect nature of many reported target interactions not reconstituted in vitro\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 1, 3, 5, 33]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 13, 14]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 33]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 7]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [10, 22]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [10, 22, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [0, 22]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 11, 22]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [11, 22]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [10, 23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 33]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 3, 6, 7]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 32, 38]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [10, 22, 23]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [3, 7, 8]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 7, 31, 36]}\n    ],\n    \"complexes\": [\"m6A methyltransferase complex (METTL3-METTL14-WTAP)\"],\n    \"partners\": [\"METTL3\", \"METTL14\", \"DGCR8\", \"USP7\", \"OGT\", \"PRMT1\", \"RNA polymerase II\", \"HDAC1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}