Predicted to enable glycoprotein-N-acetylgalactosamine 3-beta-galactosyltransferase activity. Predicted to be located in membrane. Human ortholog(s) of this gene implicated in Tn polyagglutination syndrome and hemolytic-uremic syndrome. Orthologous to human C1GALT1C1 (C1GALT1 specific chaperone 1) and C1GALT1C1L (C1GALT1 specific chaperone 1 like).