Prenatal diagnosis for Tay-Sachs disease using chorionic villus sampling

Area of Science:

• Medical Genetics
• Biochemistry
• Prenatal Diagnostics

Background:

• Tay-Sachs disease is a severe genetic disorder.
• Accurate prenatal diagnosis is crucial for affected families.
• Enzyme analysis is key to diagnosing Tay-Sachs disease.

Purpose of the Study:

• To evaluate chorionic villus sampling (CVS) for prenatal Tay-Sachs disease diagnosis.
• To characterize hexosaminidase enzyme activity in CVS samples.
• To compare enzyme levels in villi with other fetal tissues.

Main Methods:

• Prenatal diagnosis was performed on 25 patients via CVS.
• Hexosaminidase A and B enzyme activity was measured using gel electrophoresis.
• Enzyme activity was compared between normal and affected fetuses.

Main Results:

• CVS successfully diagnosed 19 normal and 6 affected fetuses.
• Normal villi showed both hexosaminidase A and B activity.
• Affected fetuses exhibited only hexosaminidase B activity.

Conclusions:

• CVS is an effective method for prenatal Tay-Sachs disease diagnosis.
• Enzyme analysis of CVS can differentiate between affected and unaffected fetuses.
• Hexosaminidase A levels in villi are lower than in amniotic cells but sufficient for diagnosis.