regulator of mRNA translation; Specifically recognizes and binds N6-methyladenosine (m6A)-containing RNAs and promotes RNA translation efficiency. Facilitates the translation of targeted mRNAs in cooperation with YTHDF1 by binding to m6A-containing mRNAs and interacting with 40S and 60S ribosome subunits. Acts as a negative regulator of type I interferon response by down-regulating interferon-stimulated genes (ISGs) expression. Can also act as a regulator of mRNA stability in cooperation with YTHDF2 by binding to m6A-containing mRNA and promoting their degradation. Recognizes and binds m6A-containing circular RNAs (circRNAs) and promotes their translation.