Phenylalanine hydroxylase gene mutation R408W is present on 84% of Estonian phenylketonuria chromosomes.

Abstract excerpt

Phenylalanine hydroxylase (PAH) is the enzyme which converts phenylalanine into tyrosine. In case of its deficiency, hyperphenylalaninemia is observed, which leads to phenylketonuria (PKU), a disease causing mental retardation, unless treated with a low-phenylalanine diet since early childhood. In Estonia, PKU is among the most common inherited metabolic diseases. The data from retrospective study and newborn...

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