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Phenylketonuria (PKU) is located in the q arm of chromosome 12. It is caused by a mutation of the (PAH) phenylalanine hydroxylase gene. The (PAH) gene produces the enzyme phenylalanine hydroxylase and it then converts the phenylalanine to tyrosine.enetic Testing. The phenylalanine tolerance test is one form of genetic testing for PKU. It is performed by giving a person a measured amount of phenylalanine and the concentration of phenylalanine in the blood plasma is measured.
Mutations in the PAH gene cause phenylketonuria. The PAH gene provides instructions for making an enzyme called phenylalanine hydroxylase. This enzyme converts the amino acid phenylalanine to other important compounds in the body.f PKU is not treated, phenylalanine can build up to harmful levels in the body, causing intellectual disability and other serious health problems. The signs and symptoms of PKU vary from mild to severe. The most severe form of this disorder is known as classic PKU.