At the age of 8, she was admitted with liver dysfunction and pneumonia, the clinical examination revealed a blood glucose of 13.7 mmol/L, alanine aminotransferase (ALT) of 852 U/L (normal range, 7–40 U/L), aspartate aminotransferase (AST) of 750 U/L (normal range, 5–35 U/L), albumin of 31.0 g/L (normal range, 35–55 g/L), prothrombin time of 20 s (normal range, 9–13 s), lactic dehydrogenase (LDH) of 2,150 U/L (normal range, 120–250 U/L). The gene discussed is F2; the disease is Decreased liver function.