Predicted to contribute to phosphatidylinositol N-acetylglucosaminyltransferase activity. Acts upstream of or within GPI anchor biosynthetic process. Located in endoplasmic reticulum. Is expressed in several structures, including alimentary system; branchial arch; genitourinary system; nervous system; and sensory organ. Human ortholog(s) of this gene implicated in developmental and epileptic encephalopathy 55. Orthologous to human PIGP (phosphatidylinositol glycan anchor biosynthesis class P). [provided by Alliance of Genome Resources, Apr 2022]