Enables biotinidase activity. Acts upstream of or within biotin metabolic process. Located in apical part of cell; nucleolus; and perikaryon. Is expressed in blood vessel; inner ear; nervous system; and urinary system. Used to study biotinidase deficiency. Human ortholog(s) of this gene implicated in biotinidase deficiency. Orthologous to human BTD (biotinidase). [provided by Alliance of Genome Resources, Apr 2022]