Abstract
2′-O-methylation (Nm) is one of the most abundant RNA epigenetic modifications and plays a vital role in the post-transcriptional regulation of gene expression. Current Nm mapping approaches are normally limited to highly abundant RNAs and have significant technical hurdles in mRNAs or relatively rare non-coding RNAs (ncRNAs). Here, we developed a new method for enriching Nm sites by using RNA exoribonuclease and periodate oxidation reactivity to eliminate 2′-hydroxylated (2′-OH) nucleosides, coupled with sequencing (Nm-REP-seq). We revealed several novel classes of Nm-containing ncRNAs as well as mRNAs in humans, mice, and drosophila. We found that some novel Nm sites are present at fixed positions in different tRNAs and are potential substrates of fibrillarin (FBL) methyltransferase mediated by snoRNAs. Importantly, we discovered, for the first time, that Nm located at the 3′-end of various types of ncRNAs and fragments derived from them. Our approach precisely redefines the genome-wide distribution of Nm and provides new technologies for functional studies of Nm-mediated gene regulation.
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This work was supported by the National Key R&D Program of China (2019YFA0802202), the National Natural Science Foundation of China (91940304, 31971228, 31900903, 31970604, 32100467, 32225011), and the Youth Science and Technology Innovation Talent of Guangdong TeZhi Plan (2019TQ05Y181).
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Zhang, P., Huang, J., Zheng, W. et al. Single-base resolution mapping of 2′-O-methylation sites by an exoribonuclease-enriched chemical method. Sci. China Life Sci. 66, 800–818 (2023). https://doi.org/10.1007/s11427-022-2210-0
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DOI: https://doi.org/10.1007/s11427-022-2210-0