Acts upstream of or within osteoclast differentiation. Located in cytosol. Is expressed in several structures, including alimentary system; hemolymphoid system gland; nervous system; skeleton; and skin. Used to study autosomal recessive osteopetrosis 5. Human ortholog(s) of this gene implicated in autosomal recessive osteopetrosis 5. Orthologous to human OSTM1 (osteoclastogenesis associated transmembrane protein 1). [provided by Alliance of Genome Resources, Apr 2022]