Predicted to enable squalene synthase [NAD(P)H] activity. Predicted to be involved in cholesterol biosynthetic process and farnesyl diphosphate metabolic process. Predicted to act upstream of or within lipid biosynthetic process. Predicted to be active in endoplasmic reticulum membrane. Is expressed in brain. Orthologous to human FDFT1 (farnesyl-diphosphate farnesyltransferase 1).