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Prenatal diagnosis of I-cell disease was achieved by monitoring enzyme levels in amniotic fluid and observing cellular changes. This allowed for accurate prediction of the genetic disorder in a high-risk pregnancy.
Area of Science:
- Medical Genetics
- Biochemistry
- Prenatal Diagnostics
Background:
- I-cell disease, also known as mucolipidosis II, is a severe lysosomal storage disorder.
- Genetic counseling and prenatal diagnosis are crucial for families with a history of I-cell disease.
Purpose of the Study:
- To monitor a pregnancy at risk for I-cell disease.
- To diagnose fetal I-cell disease using biochemical and morphological markers.
Main Methods:
- Analysis of lysosomal enzyme activities in amniotic fluid.
- Assessment of enzyme levels in cultured amniotic fluid cells.
- Microscopic examination of cytoplasmic inclusions in cultured amniotic cells.
- Confirmation of diagnosis using cultured skin fibroblasts from the aborted fetus.
Main Results:
- Elevated lysosomal enzyme activities (excluding acid phosphatase and alpha-glucosidase) were observed in amniotic fluid.
- Enzyme activities were reduced in cultivated amniotic fluid cells.
- Cytoplasmic inclusions were detected in cultivated amniotic cells via phase contrast microscopy.
- Diagnosis was confirmed post-abortion.
Conclusions:
- Prenatal diagnosis of I-cell disease is feasible using amniotic fluid enzyme analysis and cell morphology.
- Biochemical and cellular findings in amniotic fluid can accurately predict I-cell disease.
- Early diagnosis allows for informed reproductive decisions in at-risk families.
Abstract:
A pregnancy from a family in risk of I-cell disease was monitored. The fetus was diagnosed as having I-cell disease based on the findings that (1) lysosomal enzyme activities except for acid phosphatase and alpha glucosidase were clearly elevated in amniotic fluid and were reduced in cultivated amniotic fluid cells, and (2) cytoplasmic inclusions were seen in cultivated amniotic cells by phase contrast microscopy. The accuracy of prediction was confirmed by cultured skin fibroblast of the aborted fetus.