Enables lanosterol synthase activity. Involved in cholesterol biosynthetic process. Located in intracellular membrane-bounded organelle. Human ortholog(s) of this gene implicated in alopecia-mental retardation syndrome 4; cataract; cataract 44; and hypotrichosis 14. Orthologous to human LSS (lanosterol synthase). [provided by Alliance of Genome Resources, Apr 2022]