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Effect of depletion of METTL16 on gene expression HPMVECs [MeRIP-Seq]

ABSTRACT: A recently identified N6-methyladenosine (m6A) methyltransferase, METTL16 functions independently of the METTL3/METTL14 complex.Considering the methyltransferase activity of METTL16 and several reported transcripts, we performed methylated RNA immunoprecipitation sequencing (MeRIP-seq) analyses on endothelial cells that were treated with either shCtrl or shMETTL16 lentivirus.

ORGANISM(S): Homo sapiens

PROVIDER: GSE295954 | GEO | 2026/04/30

REPOSITORIES: GEO

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Effect of depletion of METTL16 on gene expression HPMVECs [RNA-Seq]

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Project description:To identify the directly bound transcripts of METTL3, METTL14, and METTL16, RNA immunoprecipitation sequencing (RIP-seq) was conducted HEK293T stablely expressing METTL3, METTL14, and METTL16, respectively. Briefly, HEK293T cells were infected with lentivirus, pmiRNA1-3 x Flag-METTL3, pmiRNA1-3 x Flag-METTL14, and pmiRNA1-3 x Flag-METTL14, to overexpress the three METTL family members with 3 x Flag fused in the N-terminal. Only the GFP-positive cells were used for study and expanded in DMEM medium.

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METTL16 is a N6-methyladenosine (m6A) methyltransferase that targets pre-mRNAs and various non-coding RNAs

Project description:N6-methyladenosine (m6A) is a highly dynamic RNA modification that has recently emerged as a key regulator of gene expression. While many m6A modifications are installed by the METTL3-METTL14 complex, others appear to be introduced independently, implying that additional human m6A methyltransferases remain to be identified. Using crosslinking and analysis of cDNA (CRAC), we reveal that the putative human m6A “writer” protein METTL16 binds to the U6 snRNA and other ncRNAs as well as numerous lncRNAs and pre-mRNAs. We demonstrate that METTL16 is responsible for N6-methylation of A43 of the U6 snRNA and identify the early U6 biogenesis factors La, LARP7 and the methylphosphate capping enzyme MEPCE as METTL16-interaction partners. Interestingly, A43 lies within an essential ACAGAGA box of U6 that base pairs with 5’ splice sites of pre-mRNAs during splicing, suggesting that METTL16-mediated modification of this site plays an important role in splicing regulation. The identification of METTL16 as an active m6A methyltransferase in human cells expands our understanding of the mechanisms by which the m6A landscape is installed on cellular RNAs.

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Project description:The N6-methyladenosine (m6A) RNA modification is an important regulator of gene expression. m6A is deposited by a methyltransferase complex that includes methyltransferase-like 3 (METTL3) and methyltransferase-like 14 (METTL14). High levels of METTL3 and METTL14 drive the growth of many types of adult cancer, and METTL3/METTL14 inhibitors are emerging as new anticancer agents. However, little is known about the m6A epitranscriptome or the role of the METTL3/METTL14 complex in neuroblastoma, a common pediatric cancer. Here, we show that METTL3 knockdown or pharmacologic inhibition with the small molecule STM2457 leads to reduced neuroblastoma cell proliferation and increased differentiation. These changes in neuroblastoma phenotype were associated with decreased m6A deposition on transcripts involved in nervous system development and neuronal differentiation and increased stability and expression of target mRNAs. In preclinical studies, STM2457 treatment suppressed the growth of neuroblastoma tumors in vivo. Together, these results support the potential of METTL3/METTL14 complex inhibition as therapeutic strategy against neuroblastoma.

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Project description:METTL16 is a member of methyltransferase like (METTL) family. Unlike well-studied METTL3 and METTL14, we found a much higher percentage of METTL16 is localized in the cytosol. The subcellular distribution holds the ability to potentiate translation efficiency. Via Far-western blotting and Co-Immunoprecipitation (Co-IP) assays, we have identified the direct interactions between METTL16 and eukaryotic initiation factor 3 (eIF3) a and b. Via cross-linking immunoprecipitation and qPCR (CLIP-qPCR), we have discovered the direct associations between METTL16 and rRNAs. The METTL16-eIF3a/b and METTL16-rRNAs interactions induce the binding between eIF3 and 18S rRNA, promote the formation of 43S preinitiation complex, and eventually expedite translation initiation, the rate-limiting step of translation. To determine the exact effects of METTL16 on translation efficiency, we performed ribosome profiling (Ribo-seq) with HEK293T upon CRISPR-Cas9-induced METTL16 knockout. To guarantee the repeatability and avoid any potential off-target effects, we included 3 distint sgRNAs against METTL16.

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m6A independent genome-wide METTL3 and METTL14 redistribution drives senescence-associated secretory phenotype [MeRIP-seq]

Project description:Methyltransferase-like 3 (METTL3) and 14 (METTL14) are core subunits of the methyltransferase complex (MTC) that catalyzes mRNA N6-methyladenosine (m6A) modification. Despite the expanding list of m6A-dependent function of the MTC, m6A independent function of the METTL3 and METTL14 complex remains poorly understood. Here we show that genome-wide redistribution of METTL3 and METTL14 drives senescence-associated secretory phenotype (SASP) in a m6A-independent manner. METTL3 and METTL14 are necessary for SASP. However, SASP is not regulated by m6A mRNA modification. METTL14 is redistributed to the enhancers, while METTL3 is localized to the pre-existing NF-B sites within the promoters of the SASP genes during senescence. METTL3 interacts with NF-B and they are mutually dependent on their associations with the promoters of SASP genes. METTL14 but not METTL3 is necessary for function of SASP gene enhancers. METTL3 and METTL14 are required for both the tumor-promoting and immune surveillance functions of senescent cells mediated by SASP in vivo in mouse models. In summary, our results report a m6A independent function of the METTL3 and METTL14 complex in promoting SASP through regulating transcription by genome-wide redistribution of METTL14 to enhancers and METTL3 to promoters of SASP genes during senescence.

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