The Wtap family includes female-lethal(2)D from Drosophila and pre-mRNA-splicing regulator WTAP from mammals. The former is required for female-specific splicing of Sex-lethal RNA [1], and the latter is a regulatory subunit of the RNA N6-methyladenosine methyltransferase [2]. The family also includes the yeast Mum2p protein which is part of the Mis complex.

1: The Drosophila melanogaster fl(2)d gene is needed for the female-specific splicing of Sex-lethal RNA. Granadino B, Campuzano S, Sanchez L; EMBO J. 1990;9:2597-2602. PMID:1695150

2: Mammalian WTAP is a regulatory subunit of the RNA N6-methyladenosine methyltransferase. Ping XL, Sun BF, Wang L, Xiao W, Yang X, Wang WJ, Adhikari S, Shi Y, Lv Y, Chen YS, Zhao X, Li A, Yang Y, Dahal U, Lou XM, Liu X, Huang J, Yuan WP, Zhu XF, Cheng T, Zhao YL, Wang X, Rendtlew Danielsen JM, Liu F, Yang YG; Cell Res. 2014;24:177-189. PMID:24407421