[Prenatal brain damage in maternal, untreated phenylketonuria]

Area of Science:

• Biochemistry
• Genetics
• Maternal-Fetal Medicine

Background:

• Untreated phenylketonuria (PKU) in mothers poses risks to fetal development.
• Literature documents intellectual disability in non-phenylketonuric offspring of untreated PKU mothers.
• This study presents an additional case and emphasizes screening.

Observation:

• A case of classical phenylketonuria was identified in a pregnant woman during routine screening.
• Amino acid analysis of amniotic fluid showed elevated phenylalanine and diminished essential amino acids.
• Fetal brain amino acid estimation also indicated very high phenylalanine levels.

Findings:

• High maternal phenylalanine levels directly impact fetal amino acid balance.
• Elevated phenylalanine in fetal brain is associated with developmental risks.
• The case highlights the importance of maternal PKU management.

Implications:

• Routine Phenylketonuria (PKU) screening for all pregnant women is essential at initial counseling.
• Early detection allows for timely intervention to prevent adverse fetal outcomes.
• Maternal metabolic health is critical for normal fetal neurodevelopment.