GSTZ1 and hyperinsulinemic hypoglycemia, familial, 4: While this suggests a benign clinical course of MAAI deficiency without specific treatment, the long-term consequences of human MAAI deficiency are currently unknown and results from MAAI-deficient mice and one case report imply that under certain conditions, MAAI deficiency may result in clinically relevant hepatic affection [4,5,6,7].