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[Screening of tetrahydrobiopterin deficiency among hyperphenylalaninemic patients]
1Laboratoire de biochimie, Hôpital Saint-Philibert, 115, rue du Grand-But, 59462 Lomme cedex.
Insights
Rapid screening for tetrahydrobiopterin deficiency in newborns with hyperphenylalaninemia is crucial. A simple filter paper method detects deficiencies, enabling timely, specific follow-up for affected infants.
Area of Science:
- Biochemistry
- Genetics
- Neonatal screening
Context:
- Hyperphenylalaninemia in newborns requires prompt diagnosis.
- Tetrahydrobiopterin (BH4) deficiency is a treatable metabolic disorder.
- Early detection of BH4 deficiency is critical for proper patient management.
Purpose:
- To evaluate a long-standing screening strategy for tetrahydrobiopterin deficiencies.
- To assess the efficacy of a simple, filter paper-based method for detecting BH4 deficiencies in neonates.
- To analyze the prevalence of BH4 deficiencies among screened hyperphenylalaninemic infants.
Summary:
- A screening strategy utilizing urine pteridine and dried blood enzyme measurements has been employed since 1987.
- This method effectively detects deficiencies in 6-pyruvoyl-tetrahydropterin synthase, GTPcyclohydrolase I, pterin-4a-carbinolamine dehydratase, and dihydropteridine-reductase.
- Out of 1,814 hyperphenylalaninemic patients studied, 34 cases of tetrahydrobiopterin deficiency were identified.
Impact:
- The described screening strategy is convenient and simple for widespread neonatal application.
- It allows for the detection of BH4 deficiencies regardless of the initial blood phenylalanine level.
- This approach facilitates essential, disease-specific follow-up for affected infants, improving outcomes.
Abstract:
Tetrahydrobiopterin deficiency in hyperphenylalaninemic babies has to be rapidly recognized since the disease requires a specific follow-up. Based on specimen collection on filter paper, a simple strategy for the screening of this condition has been used since 1987. Urine pteridine measurement can detect 6-pyruvoyl-tetrahydropterin synthase, GTPcyclohydrolase I and pterin-4a-carbinolamine dehydratase deficiencies and direct enzyme measurement in dried blood sample detects dihydropteridine-reductase deficiency. A total of 1,814 hyperphenylalaninemic patients have been studied and 34 tetrahydrobiopterin deficiencies have been detected. The strategy must commend itself by its convenience and simplicity, and can be use on all babies with hyperphenylalaninemia screened in the neonatal period, whatever their blood phenylalanine level.