N-acetylglucosamine-1-phosphate transferase is a transferase enzyme.It is associated with the following conditions: mucolipidosis II alpha/beta (I-cell disease) – GNPTAB mucolipidosis III alpha/beta (pseudo-Hurler polydystrophy) – GNPTAB mucolipidosis III gamma – GNPTG In melanocytic cells GNPTG gene expression may be regulated by MITF.