A 25-year-old woman, previously in good health with no history of drug use, family history, infectious disease, or genetic disease, presented at 16 1/7 weeks of gestation with abnormal liver function tests (LFTs) detected at an external hospital: alanine aminotransferase (ALT) 209 IU/L and aspartate aminotransferase (AST) 85 IU/L. The gene discussed is GPT; the disease is hereditary disease.