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Effects of Mettl3 and Alkbh5 knockdown on small RNA export into EVs

ABSTRACT: Effects of Mettl3 and Alkbh5 knockdown on small RNA export into EVs

PROVIDER: PRJNA701467 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13693830.fastq.gz	Fastqsanger.gz
	SRR13693831.fastq.gz	Fastqsanger.gz
	SRR13693832.fastq.gz	Fastqsanger.gz
	SRR13693833.fastq.gz	Fastqsanger.gz
	SRR13693834.fastq.gz	Fastqsanger.gz

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Effects of Mettl3 and Alkbh5 knockdown on small RNA export into EVs

Project description:Understanding the functional role of RNA modifications and to what extent they might regulate mature miRNA function and their secretion in extracellular vesicles (EVs) is unknown. Analysis of RNA content across a variety of EVs has shown differential miRNA enrichment when compared to parental cell expression patterns. Whether this is due to differential stability, specific regulation of miRNA export, or other mechanisms is unclear. Here, we tested whether RNA base modifications and recognition of those modifications might underlie differential miRNA export into EVs derived from KRAS mutant cell lines. We found that decreased levels of Mettl3, a writer of N6-methyladenosine (m6A) modification, altered extracellular transfer of miRNAs containing consensus sequences for m6A. Further, EVs prepared from cells expressing shRNAs against Mettl3 were incapable of conferring colony growth in 3D to wild type KRAS cells. Our data indicate that m6A modification plays an important role in miRNA export to EVs.

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Project description:Effects of Mettl3 and Alkbh5 knockdown on total RNA

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Project description:N6-methyladenosine (m6A) is the most prevalent internal modification of messenger RNA (mRNA) in higher eukaryotes. Here we report ALKBH5 as a new mammalian demethylase that oxidatively removes the m6A modification in mRNA in vitro and inside cells. This demethylation activity of ALKBH5 significantly affects mRNA export and RNA metabolism as well as the assembly of mRNA processing factors in nuclear speckles. Alkbh5-deficient male mice are characterized by impaired fertility resulting from apoptosis that affects meiotic metaphase-stage spermatocytes. In accordance with this defect, we have identified in mouse testes 1552 differentially expressed genes which cover broad functional categories and include spermatogenesis-related mRNAs involved in the p53 functional interaction network. We show that Alkbh5-deficiency impacts the expression levels of some of these mRNAs, supporting the observed phenotype. The discovery of this new RNA demethylase strongly suggests that the reversible m6A modification plays fundamental and broad functions in mammalian cells. RNA-seq in two cell types

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Project description:we find METTL3 associates with polyribosomes and promotes translation. METTL3 depletion inhibits translation, and both wild-type and catalytically inactive METTL3 promote translation when tethered to the 3' untranslated region (UTR) of a reporter mRNA. Mechanistically, METTL3 enhances mRNA translation through an interaction with the translation initiation machinery. m6A seq in A549 and H1299 cells, RNA seq in METTL3 knockdown cells

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2020-05-26 | GSE144959 | GEO

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