UGT1A1 and disorder of glycogen metabolism: To date, the strongest and most consistently replicated common genetic variants associated with GSD reside in the ATP-binding cassette subfamily G member 5/8 ABCG5/8 gene (rs11887534; hg19, chr2:44066247G>C) [3, 6] and in the UDP glucuronosyltransferase family 1 member A1 UGT1A1 gene (rs6742078; hg19, chr2:234672639G>T), with the latter significantly associated with GSD only in men [7].