Related Experiment Videos
Cognitive development in offspring of untreated and preconceptionally treated maternal phenylketonuria
1John F. Kennedy Institute, Glostrup, Denmark.
Insights
Preconceptional dietary treatment for maternal phenylketonuria (PKU) leads to normal offspring development. Strict phenylalanine control before and during pregnancy prevents intellectual disability and microcephaly in children born to mothers with PKU.
Area of Science:
- Metabolic disorders
- Genetics
- Maternal health
Background:
- Maternal phenylketonuria (PKU) poses significant risks to fetal development, including intellectual disability and microcephaly.
- Untreated high phenylalanine levels in pregnant women with PKU can cause developmental issues in offspring.
- Early intervention through dietary management is crucial for improving pregnancy outcomes in women with PKU.
Purpose of the Study:
- To evaluate the long-term effects of preconceptional dietary treatment on offspring of mothers with PKU.
- To assess the impact of strict phenylalanine control on neurodevelopmental outcomes in children born to mothers with PKU.
- To provide evidence supporting the benefits of planned pregnancies and dietary adherence for women with PKU.
Main Methods:
- Literature review of 26 maternal PKU pregnancies treated preconceptionally.
- Case study of two women with unrecognized maternal PKU and affected offspring.
- Implementation of a strict low-phenylalanine diet prior to conception and weekly monitoring during pregnancy.
- Detailed assessment of offspring neurodevelopmental outcomes, including IQ and head circumference.
Main Results:
- Offspring from preconceptional treated pregnancies exhibited normal development, IQs (105 and 119), and head circumferences.
- This contrasts with older siblings born after untreated pregnancies, who had microcephaly and intellectual disability.
- Dietary management successfully maintained maternal phenylalanine levels within the recommended therapeutic range (0.18–0.42 mmol/L) during pregnancy.
Conclusions:
- Preconceptional dietary treatment is highly effective in preventing adverse neurodevelopmental outcomes in children of mothers with PKU.
- Strict adherence to a low-phenylalanine diet before and during pregnancy is essential for successful outcomes.
- These findings encourage women with PKU to undergo planned pregnancies and maintain dietary compliance to ensure healthy offspring development.
Abstract:
A survey is given of literature reports on the effect of performance in offspring from 26 maternal PKU pregnancies treated prior to conception. The survey includes two women who were referred to us for genetic counselling because they had both given birth to microcephalic, mentally retarded children. The women were discovered to suffer from unrecognized maternal PKU with fasting phenylalanine concentration of 1.1-1.5 mmol/L. A strict diet was introduced prior to planned pregnancy and after some months on diet (phenylalanine concentrations less than 0.6 mmol/L) they became pregnant again. Serum phenylalanine levels were monitored weekly throughout pregnancy, and adjustments in the diet were made to keep serum phenylalanine concentration within the range of 0.18-0.42 mmol/L. The outcome of the pregnancies were healthy children who have developed normally. Their IQs are 105 and 119 at ten and four years of age, respectively and their head circumferences are normal. Our data show that the effect of preconceptional dietary treatment was children with a normal performance, contrary to their older siblings born following untreated pregnancies. These results are in agreement with the survey of ten years' promising experiences with preconceptional treatment in maternal PKU. The data may help to motivate young PKU women to accept planned pregnancies and to encourage them to return to the strict diet, which has prevented them from being retarded.