The function of Ensembl gene identifier ENSG00000165195 (PIGA, phosphatidylinositol glycan anchor biosynthesis class A) is as follows. Catalytic subunit of the glycosylphosphatidylinositol-N- acetylglucosaminyltransferase (GPI-GnT) complex that catalyzes the transfer of N-acetylglucosamine from UDP-N-acetylglucosamine to phosphatidylinositol and participates in the first step of GPI biosynthesis. .