Phenylketonuria, or PKU, is a genetic disorder in which the level of an amino acid called phenylalanine exists at an exorbitant level in the blood. This is caused by the body’s inability to properly metabolize phenylalanine, which is caused by a defect in the gene that creates the enzyme responsible for breaking down phenylalanine, known as a PAH gene.1 This condition was discovered by Dr. Ivar Asbjørn Følling, in 1934. Dr. Ivar Asbjørn Følling had received two young children, both of whom suffered…
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