Prenatal diagnosis of propionic acidemia.

Area of Science:

• Biochemistry
• Medical Genetics
• Metabolic Disorders

Background:

• Propionic acidemia is a serious inherited metabolic disorder.
• Accurate and timely prenatal diagnosis is crucial for management.
• Existing diagnostic methods can be time-consuming.

Purpose of the Study:

• To establish a rapid prenatal diagnostic method for propionic acidemia.
• To identify a unique biomarker for prenatal detection.
• To confirm the diagnosis using enzyme activity assays.

Main Methods:

• Detection of methylcitrate in amniotic fluid using liquid partition chromatography and gas chromatography-mass spectrometry.
• Assay of propionyl-CoA carboxylase activity in cultured amniotic fluid cells and fetal tissues.
• Analysis of organic acids in amniotic fluid.

Main Results:

• Methylcitrate was detected in the amniotic fluid of a fetus with propionic acidemia.
• Deficient propionyl-CoA carboxylase activity confirmed the diagnosis.
• Absence of methylcitrate in subsequent pregnancies predicted normal or heterozygous outcomes.
• Rapid diagnosis was achieved within 48 hours of sample collection.

Conclusions:

• Detection of methylcitrate in amniotic fluid is a reliable method for prenatal diagnosis of propionic acidemia.
• This approach allows for rapid and accurate prenatal testing.
• The method may be applicable to other metabolic disorders with unique biomarkers.