Predicted to enable beta-1,3-galactosyl-O-glycosyl-glycoprotein beta-1,3-N-acetylglucosaminyltransferase activity and manganese ion binding activity. Predicted to be involved in O-glycan processing. Predicted to be integral component of membrane. Predicted to be integral component of Golgi membrane. Human ortholog(s) of this gene implicated in lissencephaly; muscular dystrophy (multiple); and retinitis pigmentosa. Orthologous to human POMGNT1 (protein O-linked mannose N-acetylglucosaminyltransferase 1 (beta 1,2-)). [provided by Alliance of Genome Resources, Apr 2022]