M6A

N6-methyladenosine or m6A is the N6 position of adenosine is vital for many different biological processes including transcription, translation and decay of mRNA.

Function
Widespread mRNA methylation known as N6-adenosine methylation occurs at m6A, and it is believed to apply to all RNA viruses infections and some DNA viruses.

In humans and other mammals m6A-related methyltransferases are mostly made up of a complex of methyltransferase-like protein 3 (METTL3) and methyltransferase-like protein 14 (METTL14).

Notable studies

 * 2021, COVID-19: A methyl-group assault? (Full text)