Involved in attachment of GPI anchor to protein. Part of GPI-anchor transamidase complex. Is expressed in several structures, including alimentary system; brain; respiratory system; sensory organ; and urinary system. Human ortholog(s) of this gene implicated in developmental and epileptic encephalopathy. Orthologous to human PIGS (phosphatidylinositol glycan anchor biosynthesis class S). [provided by Alliance of Genome Resources, Apr 2022]