Enables mRNA binding activity. Involved in several processes, including mRNA processing; nervous system development; and regulation of alternative mRNA splicing, via spliceosome. Acts upstream of or within sensory perception of sound. Located in nucleus. Is expressed in central nervous system and inner ear. Orthologous to human SRRM4 (serine/arginine repetitive matrix 4). [provided by Alliance of Genome Resources, Apr 2022]