Predicted to enable U4 snRNA binding activity and U6 snRNA binding activity. Predicted to be involved in mRNA splicing, via spliceosome. Predicted to act upstream of or within RNA splicing and mRNA processing. Predicted to be located in Cajal body and nuclear speck. Predicted to be part of U2-type precatalytic spliceosome; U4/U6 snRNP; and U4/U6 x U5 tri-snRNP complex. Human ortholog(s) of this gene implicated in retinitis pigmentosa 70. Orthologous to human PRPF4 (pre-mRNA processing factor 4). [provided by Alliance of Genome Resources, Apr 2022]