congenital heart defects, multiple types, 6 (MONDO_0013463, a Monarch Disease Ontology identifier) is any dextro-looped transposition of the great arteries in which the cause of the disease is a mutation in the GDF1 gene. Also known as: DTGA3, GDF1 dextro-looped transposition of the great arteries, dextro-looped transposition of the great arteries 3, dextro-looped transposition of the great arteries caused by mutation in GDF1, dextro-looped transposition of the great arteries type 3, transposition of the great arteries, dextro-looped type 3.