eLife Assessment
This valuable study provides solid evidence that N6 methylation of A74 by METTL3 is required for efficient translation directed by the SARS-CoV-2 5′UTR in uninfected cells, likely by limiting access of protein factors to the 5′UTR that are necessary for efficient translation. These findings advance our understanding of the role of RNA modification in coronavirus replication and m6A-mediated regulation of gene expression more broadly, while further supporting METTL3 as a potential anticoronaviral therapeutic target. However, the evidence that m6A acts by destabilizing the third stem-loop (SL3) of the 5′UTR remains incomplete. The impact of the study would be strengthened by biochemical analyses directly assessing structural changes in the 5′UTR induced by A74 methylation.