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Related Experiment Videos

Intelligence in mild atypical phenylketonuria

P M Costello1, M G Beasley, S L Tillotson

  • 1Medical Unit, Institute of Child Health, London, UK.

European Journal of Pediatrics
|April 1, 1994
PubMed
Summary
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Even mild phenylketonuria (PKU) can impact intelligence. Lowering blood phenylalanine (Phe) levels below 400 mumol/l in early childhood is crucial for cognitive development in children with PKU.

Area of Science:

  • Biochemistry
  • Pediatrics
  • Neuroscience

Background:

  • Phenylketonuria (PKU) is a genetic disorder affecting phenylalanine metabolism.
  • Mild PKU cases have blood phenylalanine (Phe) levels below 900 mumol/l.
  • The impact of Phe levels on cognitive development in mild PKU requires further investigation.

Purpose of the Study:

  • To examine the relationship between blood Phe concentrations and intelligence in children with mild PKU.
  • To determine if treatment and social class influence this relationship.
  • To establish optimal Phe control targets for cognitive outcomes.

Main Methods:

  • Studied 82 children with mild PKU (ages birth to 4 years).
  • Assessed intelligence quotient (IQ) at age 4 using Stanford-Binet.

Related Experiment Videos

  • Correlated average blood Phe levels with IQ, considering treatment status and social class.

    • Main Results:

    • Mean IQs were below population norms in both treated and untreated children.
    • IQ decreased by approximately 6 points for every 100 mumol/l increase in mean Phe levels.
    • The Phe-IQ relationship was more pronounced in mild PKU than previously reported.

    Conclusions:

    • Blood Phe levels of 400 mumol/l or higher necessitate dietary intervention in mild PKU.
    • Maintaining Phe levels below 400 mumol/l is recommended throughout early childhood.
    • Early and consistent Phe control is vital for optimal cognitive development in all PKU forms.