ArticleJournal of inherited metabolic disease1998
Aberrant phenylalanine metabolism in phenylketonuria heterozygotes.
Article in Journal of inherited metabolic disease, 1998. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 18 citations in OpenAlex.
- Neuropsychological profile in parents of adult phenylketonuria patients.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2018Article
- Development of a Whole Blood Paper-Based Device for Phenylalanine Detection in the Context of PKU Therapy Monitoring.Micromachines · 2016Article
- Monoamine neurotransmitter disorders--clinical advances and future perspectives.Nature reviews. Neurology · 2015Review
- Phenotyping heterozygous carriers of juvenile neuronal ceroid lipofuscinosis with CLN3 mutations.Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie · 2015Article
- Urinary neopterin and phenylalanine loading test as tools for the biochemical diagnosis of segawa disease.JIMD reports · 2013Article
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
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Abstract
The wide variation in phenylalanine hydroxylating capacity observed among patients with phenylketonuria (PKU) is primarily due to allelic heterogeneity at the phenylalanine hydroxylase (PAH) locus. In this study, we examined phenylalanine metabolism after an oral phenylalanine load in 148 carriers of known PAH gene mutations. As a group, heterozygotes formed less tyrosine than normozygotes (p < 0.001), and there was a tendency that carriers of a severe PAH mutation formed less tyrosine than carriers of a mild mutation. Nevertheless, the interindividual variation was extensive, and we identified a group of individuals who formed no or very little tyrosine after the phenylalanine load. This tyrosine response was accompanied by a decreased ability to eliminate the phenylalanine test dose but did not correlate with the intrinsic severity of the mutant PAH allele. Examination of the entire coding region of the PAH gene revealed no additional sequence alterations in these subjects. Our data suggest that a subset of PKU heterozygotes have reduced phenylalanine hydroxylating capacity approaching or equalling the levels observed in genetic compounds with non-PKU mild hyperphenylalaninaemia (MHP). Awareness of this phenotypic overlap between PKU carriers and genetic compounds with two mutant alleles may be useful for clinicians and paediatricians involved in diagnosis and genetic counselling.
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