Enables protein serine/threonine kinase activity. Acts upstream of or within protein autophosphorylation. Located in nucleus. Is expressed in several structures, including dorsal mesogastrium; hemolymphoid system; liver; metanephros; and yolk sac. Human ortholog(s) of this gene implicated in pontocerebellar hypoplasia type 1A. Orthologous to human VRK1 (VRK serine/threonine kinase 1). [provided by Alliance of Genome Resources, Apr 2022]