This is a family of eukaryotic proteins that includes CCDC130 and CCDC94 from humans, Saf4 from fission yeasts and Yju2 from budding yeasts. Saf4 (also known as cwc16) is involved in mRNA splicing where it associates with cdc5 and the other cwf proteins as part of the spliceosome [1]. Yju2 is a splicing factor that is associated with the Prp 19-associated complex and acts after Prp2 in promoting the first catalytic reaction of pre-mRNA splicing [2].

1: Proteomics analysis reveals stable multiprotein complexes in both fission and budding yeasts containing Myb-related Cdc5p/Cef1p, novel pre-mRNA splicing factors, and snRNAs. Ohi MD, Link AJ, Ren L, Jennings JL, McDonald WH, Gould KL; Mol Cell Biol 2002;22:2011-2024. PMID:11884590

2: A novel splicing factor, Yju2, is associated with NTC and acts after Prp2 in promoting the first catalytic reaction of pre-mRNA splicing. Liu YC, Chen HC, Wu NY, Cheng SC; Mol Cell Biol. 2007;27:5403-5413. PMID:17515604