AIH can be classified into 3 types based on serum autoantibody testing: type 1 is characterized by anti-smooth muscle antibody (SMA) and/or anti-nuclear antibody (ANA) positivity; type 2 is characterized by anti-liver and kidney microsomal antibody (LKM-1) positivity; and the other subtypes can be characterized by anti-soluble liver antigen–antibody/anti-hepatic pancreatic antibody (SLA/LP) Positive [23]. This evidence concerns the gene SMN1 and autoimmune hepatitis.