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N1-methyladenosine (m 1 A) is an important post-transcriptional modification in RNA; however, the exact biological role of m 1 A remains to be determined. By employing a quantitative proteomics method, we identified multiple putative protein readers of m 1 A in RNA, including several YTH domain family proteins. We showed that YTHDF1-3 and YTHDC1, but not YTHDC2, could bind directly to m 1 A in RNA. We also found that Trp 432 in YTHDF2, a conserved residue in the hydrophobic pocket of the YTH domain that is necessary for its binding to N 6 -methyladenosine (m 6 A), is required for its recognition of m 1 A. An analysis of previously published data revealed transcriptome-wide colocalization of YTH domain-containing proteins and m 1 A sites in HeLa cells, suggesting that YTH domain-containing proteins can bind to m 1 A in cells. Together, our results uncovered YTH domain-containing proteins as readers for m 1 A in RNA and provided new insight into the functions of m 1 A in RNA biology.

Identification of YTH Domain-Containing Proteins as the Readers for N1-Methyladenosine in RNA