Involved in negative regulation of canonical Wnt signaling pathway; negative regulation of osteoblast differentiation; and positive regulation of fat cell differentiation. Acts upstream of or within several processes, including positive regulation of bone resorption; positive regulation of osteoclast differentiation; and regulation of ATPase activity. Located in endoplasmic reticulum. Is expressed in several structures, including brain; head mesenchyme; retina nuclear layer; thymus primordium; and vibrissa. Orthologous to human TMEM64 (transmembrane protein 64). [provided by Alliance of Genome Resources, Apr 2022]