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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Executive dysfunction in treated phenylketonuric patients.

Bahare Azadi1, Arshia Seddigh, Mehdi Tehrani-Doost

  • 1Child and Adolescent Psychiatry Dept., Institute of Psychiatry, King's College London, London, UK. bahare.azadi@iop.kcl.ac.uk

European Child & Adolescent Psychiatry
|February 18, 2009
PubMed
Summary

Early-treated phenylketonuria (PKU) patients with normal IQ show executive dysfunction, particularly in planning and attention. This impacts cognitive performance, highlighting the need for targeted interventions.

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Area of Science:

  • Neuroscience
  • Pediatrics
  • Genetics

Background:

  • Phenylketonuria (PKU) is a genetic disorder requiring early treatment to prevent intellectual disability.
  • Executive function deficits have been noted in patients with PKU, even with early and continuous treatment.

Purpose of the Study:

  • To investigate executive function performance in patients with PKU diagnosed before age two and treated continuously.
  • To identify specific domains of executive function affected by early-treated PKU.

Main Methods:

  • A neuropsychological battery including the Tower of London (TOL), Continuous Performance Test (CPT), and Stroop test was administered.
  • Ten early-treated PKU patients with normal IQ were compared to 15 typically developing controls.

Main Results:

  • PKU patients performed significantly worse on the TOL task (planning) and made more omission errors on the CPT (attention).
  • No significant differences were observed between groups on the Stroop test (inhibition).
  • Serum phenylalanine levels did not correlate with executive function test results.

Conclusions:

  • Early-treated PKU patients with normal IQ exhibit executive dysfunction, particularly in planning and attention.
  • Further research is needed to compare these findings with other neurodevelopmental disorders like ADHD and autism to determine specificity to PKU.