3-methylglutaconic aciduria type 1 (Monarch Disease Ontology id MONDO_0009610) can be described as follows. 3-methylglutaconic aciduria (3-MGA) type I is an inborn error of leucine metabolism with a variable clinical phenotype ranging from mildly delayed speech to psychomotor retardation, coma, failure to thrive, metabolic acidosis and dystonia. Also known as: 3-methylglutaconic aciduria caused by mutation in AUH, 3-methylglutaconic aciduria caused by mutation in auh, 3-methylglutaconic aciduria type I, 3-methylglutaconyl-CoA hydratase deficiency, 3MG-CoA hydratase deficiency, AUH 3-methylglutaconic aciduria, MGA type I, MGA1.