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First-year metabolic control guidelines and their impact on future metabolic control and neurocognitive functioning

Alicia de la Parra1, María Ignacia García1, Valerie Hamilton1

  • 1Laboratory of Genetics and Metabolic Disease of INTA, Universidad de Chile, Chile.

Molecular Genetics and Metabolism Reports
|October 13, 2017
PubMed

Insights

Maintaining blood phenylalanine (Phe) levels below 240 μmol/L in the first year of life positively impacts metabolic control and cognitive function in children with phenylketonuria (PKU). Early lifelong treatment is crucial for better outcomes.

Area of Science:

  • Metabolic disorders
  • Neurodevelopmental pediatrics
  • Genetics and personalized medicine

Background:

  • Phenylketonuria (PKU) requires lifelong management, with ongoing debate on optimal blood phenylalanine (Phe) concentration targets for children.
  • Variations in treatment center guidelines necessitate research into the long-term effects of different Phe levels on patient outcomes.

Purpose of the Study:

  • To compare long-term metabolic control, child development, and cognitive functioning in PKU patients based on early-life blood Phe concentrations.
  • To establish evidence-based target Phe levels for improved neurodevelopmental outcomes in pediatric PKU.

Main Methods:

  • A cohort of 70 neonatal-screened PKU patients with initial Phe > 900 μmol/L was divided into three groups based on mean first-year Phe concentrations (A: <240 μmol/L, B: 240-360 μmol/L, C: >360 μmol/L).
  • Metabolic control, psychomotor development (MDI, PDI), and IQ were assessed throughout childhood and compared across groups.

Main Results:

  • Group A maintained Phe within recommended ranges until age 6, Group B until age 3, and Group C consistently exceeded recommended levels.
  • While no significant differences in MDI/PDI were observed at 12-30 months, Group C showed lower MDI scores.
  • Higher IQ scores were observed in Group A compared to Group C at preschool and school age.

Conclusions:

  • Mean blood Phe concentrations between 120-240 μmol/L in the first year of life are associated with better metabolic control and cognitive function in children with PKU.
  • These findings support the importance of early and sustained achievement of lower Phe targets for optimal neurodevelopmental outcomes in PKU patients.

Keywords:
Blood phenylalanineChildrenGuidelinesNeurocognitive functionPKUPhenylketonuria

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