Enables 3'-5' RNA helicase activity and N6-methyladenosine-containing RNA binding activity. Involved in germline cell cycle switching, mitotic to meiotic cell cycle; oocyte development; and spermatid development. Located in cytoplasm and ribonucleoprotein granule. Is expressed in germ cell of ovary; ovary; seminiferous tubule; spermatocyte; and testis. Orthologous to human YTHDC2 (YTH domain containing 2). [provided by Alliance of Genome Resources, Apr 2022]