May function in an early step of clathrin-mediated endocytosis. May regulate Bmp signaling by regulating clathrin-mediated endocytosis of Bmp receptors. May oligomerize and form homotetramer (By similarity). Interacts with acvr1l/alk8; linking this receptor to clathrin-mediated endocytosis. Embryos display dorsoventral patterning defects analogous to the one associated with Bmp signal failure. Belongs to the FCHO family.