Predicted to enable ceramide cholinephosphotransferase activity and sphingomyelin synthase activity. Predicted to be involved in ceramide biosynthetic process and sphingomyelin biosynthetic process. Predicted to act upstream of or within sphingolipid metabolic process. Predicted to be located in membrane. Predicted to be active in Golgi membrane; endoplasmic reticulum membrane; and plasma membrane. Human ortholog(s) of this gene implicated in calvarial doughnut lesions with bone fragility. Orthologous to human SGMS2 (sphingomyelin synthase 2).