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[Maternal phenylketonuria: dietary treatment of a 2 generation illness]
D Möslinger1, S Scheibenreiter, E Spoula
1Osterreichisches Neugeborenen-Screening und Stoffwechselarnbulanz, Universitätsklinik für Kinder- u. Jugendheilkunde, AKH Wien.
Insights
Strict dietary phenylalanine restriction before and during pregnancy is crucial for preventing embryo-fetal damage in maternal phenylketonuria (PKU). Early dietary control leads to normal infant development, while poor control results in developmental issues.
Area of Science:
- Biochemistry
- Genetics
- Maternal-Fetal Medicine
Context:
- Maternal phenylketonuria (PKU) poses significant risks to fetal development, causing embryo-fetal syndrome with microcephaly and cardiac defects.
- Elevated blood phenylalanine levels in mothers with PKU are teratogenic, leading to developmental abnormalities in offspring.
- Adult women with PKU often discontinue dietary management, increasing risks during pregnancy.
Purpose:
- To evaluate the impact of dietary phenylalanine restriction on pregnancy outcomes in women with phenylketonuria.
- To assess the neurodevelopmental and somatic outcomes of infants born to mothers with PKU under varying dietary control levels.
- To emphasize the importance of preconception and prenatal dietary management in preventing maternal PKU complications.
Summary:
- A study followed 11 pregnancies in 6 women with PKU, assessing outcomes based on dietary phenylalanine control.
- Newborns from pregnancies with consistent preconception and prenatal dietary control showed normal development.
- Infants born to mothers with inadequate dietary control exhibited symptoms of phenylalanine embryofetopathy, including congenital heart disease.
Impact:
- Highlights the critical role of preconception and sustained dietary phenylalanine restriction in ensuring normal fetal development.
- Underscores the necessity of specialized metabolic centers and multidisciplinary care for managing pregnant women with PKU.
- Provides evidence for the efficacy of early and strict dietary interventions in mitigating the teratogenic effects of maternal PKU.
Background:
Maternal phenylketonuria (PKU) is an embryo-fetal syndrome including microcephaly and various organ (mainly cardiac) defects. It is caused by the toxicity of high phenylalanine levels in the blood from mothers with PKU who usually are off diet as adults. Maternal PKU is prevented by strict dietary phenylalanine restriction during pregnancy.
Patients And Results:
In Austria since 1967, 59 female PKU patients were born who at present time are between 16-32 years of age. We report on 11 pregnancies from 6 women with PKU who asked for dietary treatment during pregnancy. 5 newborns from 5 pregnancies with good dietary control (preconceptionally and during the entire period of pregnancy) were normally developed during an up to 5 year-somatic and neurodevelopmental follow up. In one pregnancy dietary control was achieved only after the first 5 weeks of pregnancy. the respective newborn had congenital heart disease, but otherwise was developed normally. 3 newborns from 1 mother who was not able to achieve dietary control during the entire period of pregnancy, had typical symptoms of phenylalanine embryofetopathy. 2 pregnancies were terminated by spontaneous abortion despite preconceptional dietary control.
Conclusion:
Preconceptional dietary balance and low blood phenylalanine levels are important for normal embryo-fetal development. The dietary management of pregnant PKU women should be carried out in specialized metabolic centers with experience in the treatment of PKU in close cooperation with the obstetrician.