Predicted to enable alpha-1,2-mannosyltransferase activity. Predicted to be involved in GPI anchor biosynthetic process and mannosylation. Predicted to act upstream of or within GPI anchor metabolic process. Located in endoplasmic reticulum membrane. Human ortholog(s) of this gene implicated in developmental and epileptic encephalopathy 80. Orthologous to human PIGB (phosphatidylinositol glycan anchor biosynthesis class B). [provided by Alliance of Genome Resources, Apr 2022]