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Plasma amino acid pattern at noon in early treated hyperphenylalaninemic, phenylketonuric, and normal children
Insights
Early treated children with phenylketonurics (PKU) and variants on diet showed minimal plasma amino acid deviations, except for phenylalanine. Consistent findings included lower arginine in younger patients and higher lysine, serine, and histidine across all ages.
Area of Science:
- Biochemistry
- Pediatrics
- Metabolic Disorders
Background:
- Phenylketonuria (PKU) is an inherited metabolic disorder requiring early dietary intervention.
- Long-term effects of early treatment on plasma amino acid profiles in children beyond infancy are not fully elucidated.
- Understanding these profiles is crucial for monitoring metabolic balance and potential complications.
Purpose of the Study:
- To compare plasma amino acid patterns in early-treated hyperphenylalaninemic children with normal controls.
- To identify specific amino acid deviations in different age groups of treated PKU patients.
- To assess the impact of long-term dietary management on amino acid homeostasis.
Main Methods:
- A cross-sectional study involving 41 children with hyperphenylalaninemia (classical PKU and variants) on a controlled diet.
- Plasma amino acid levels were analyzed at noon in patients aged 2 months to 15 years.
- Comparison of patient data with 31 age-matched healthy controls.
Main Results:
- Except for phenylalanine, mean plasma amino acid levels in treated children showed only slight deviations from controls across five age groups.
- A trend towards lower mean arginine levels was observed in younger patients.
- Elevated mean levels of lysine, serine, and histidine were consistently found in patients across all age groups.
Conclusions:
- Early dietary treatment for PKU and related disorders leads to near-normal plasma amino acid patterns in older children.
- Specific amino acid alterations, notably lower arginine and higher lysine, serine, and histidine, persist despite treatment.
- These findings highlight the importance of continued monitoring and potential targeted supplementation in managing long-term metabolic balance.
Abstract:
In 41 hyperphenylalaninemic early treated children (classical phenylketonurics and hyperphenylalaninemic variants) on diet, aged 2 months to 15 years, the plasma amino acid pattern at noon was compared with that in 31 normal age-matched controls. In contrast to previously published results in infants, the mean levels of single amino acids deviated, with the exception of phenylalanine, only slightly from that of normal controls in patients of all five age groups investigated. Constant findings were a tendency towards low mean levels of arginine in younger patients and elevated levels of lysine, serine, and histidine which were found in patients of all age groups.