Enables U2 snRNA binding activity. Acts upstream of or within several processes, including cilium assembly; response to UV; and smoothened signaling pathway. Located in cytoplasm and nucleus. Part of ribonucleoprotein complex. Is expressed in embryo. Used to study systemic lupus erythematosus. Orthologous to human RO60 (Ro60, Y RNA binding protein). [provided by Alliance of Genome Resources, Apr 2022]