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- W4313368432 abstract "Abstract Internal N6-methyladenosine (m6A) modification is one of the most prevalent and abundant modifications of RNA. The m6A methylation is catalyzed by host methyltransferases (METTL3 and METTL14) and can be reversibly removed by host demethylases (FTO and ALKBH5). Recent studies have revealed that RNA of many DNA and RNA viruses contain m6A methylation and that viral m6A can play a pro-viral or anti-viral role. However, the biological functions of viral RNA m6A methylation remain poorly understood. In this study, we found that genome and antigenome of human respiratory syncytial virus (RSV), a non-segmented negative-sense RNA virus, are m6A methylated and that viral m6A methylation positively regulates RSV replication and gene expression. Interestingly, virion RNAs purified from RSV grown in METTL3-knockout cells induced significantly higher type I interferon responses than virion RNAs purified from RSV grown in wild type cells, demonstrating that viral RNA m6A methylation inhibits innate immunity. Similarly, inactivation of m6A methylation in RSV genome and/or antigenome by site-directed mutagenesis induced significantly higher innate immune responses than wild type RSV RNA. Mechanistically, these m6A-unmodified or m6A-deficient RSV RNAs trigger a higher expression of pattern recognition receptors (such as RIG-I and MDA5), enhance their binding affinity to the innate immune RNA sensors, and enhance the phosphorylation of downstream transcription factor IRF3, leading to an enhanced activation of type I interferon signaling pathway. Taken together, our study identified a novel biological function of viral m6A methylation, which is to serves as a molecular marker for host innate immunity to discriminate self from nonself RNAs." @default.
- W4313368432 created "2023-01-06" @default.
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- W4313368432 date "2020-05-01" @default.
- W4313368432 modified "2023-09-29" @default.
- W4313368432 title "Internal <i>N</i>6-methyladenosine modification controls the innate immune response to viral RNA" @default.
- W4313368432 doi "https://doi.org/10.4049/jimmunol.204.supp.68.14" @default.
- W4313368432 hasPublicationYear "2020" @default.
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