MRNA-sequencing of METTL3-deficient NK cells
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ABSTRACT:
PROVIDER: PRJNA746336 | ENA |
REPOSITORIES: ENA
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Project description:With mass spectrometry， we aim to find the differentially expressed proteins in Mettl3-deficient NK cells
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Project description:N6-methyladenosine (m6A) modification of mRNA catalyzed by METTL3 is enriched at a subset of stop codons. METTL3 can promote translation but the mechanism and widespread relevance remain unknown. Here we show that METTL3 enhances translation only when tethered to reporter mRNA at sites close to the stop codon supporting a mRNA looping mechanism for ribosome recycling and translational control. Electron microscopy revealed the topology of individual polyribosomes with single METTL3 foci found in close proximity to 5’ cap-binding proteins. We identify a direct physical and functional interaction between METTL3 and the eukaryotic translation initiation factor 3 subunit h (eIF3h). METTL3 promotes translation of a large subset of oncogenic mRNAs, including BRD4 that are also m6A-modified in human primary lung tumors. The METTL3-eIF3h interaction is required for enhanced translation, formation of densely packed polyribosomes, and oncogenic transformation. METTL3 depletion inhibits tumorigenicity and sensitizes lung cancer cells to BRD4 inhibition. These findings uncover a mRNA looping mechanism of translation control and identify METTL3-eIF3h as a potential cancer therapeutic target.
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