Specifically recognizes and binds N6-methyladenosine (m6A)-containing RNAs (PubMed:28675155, PubMed:33428246). M6A is a modification present at internal sites of mRNAs and some non-coding RNAs and plays a role in the efficiency of mRNA processing and stability (PubMed:28675155, PubMed:33428246). Together with Fmr1, regulates axonal growth in the mushroom bodies and neuromuscular junctions by repressing the translation of several mRNAs, such as those of chic and futsch (PubMed:33428246). Interacts with Fmr1; the interaction is RNA independent. Strongly enriched during the first 2 hours after fertilization but then declines and remains at low levels during development and adulthood. Results in fusion of the adult Beta lobes in the mushroom bodies. Belongs to the YTHDF family.