One of the hereditary diseases of man – phenylketonuria – is caused by a recessive mutation in which there is no enzyme

One of the hereditary diseases of man – phenylketonuria – is caused by a recessive mutation in which there is no enzyme that breaks down the amino acid phenylalanine, which is ingested with food. The intermediate product that accumulates in the body is toxic to the brain of the child, until it is finally formed (up to three to four years). This leads to severe mental retardation. For adults, this intermediate is non-toxic. How, in your opinion, can children with this disease be treated?

you need to limit the intake of phenylalanine with food to a certain age

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