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Prenatal exclusion of choroideremia
J A van den Hurk1, P M van Zandvoort, F Brunsmann
1Department of Human Genetics, University Hospital Nijmegen, The Netherlands.
American Journal of Medical Genetics
|December 1, 1992
Summary
Prenatal genetic testing successfully excluded the inheritance of choroideremia (CHM) in a fetus. DNA analysis of chorionic villi confirmed the absence of the at-risk allele from the mother.
Area of Science:
- Genetics
- Prenatal Diagnostics
- Ophthalmology
Background:
- Choroideremia (CHM) is an X-linked genetic disorder causing progressive vision loss.
- Predicting CHM inheritance is crucial for affected families.
- Prenatal diagnostic methods are essential for early intervention and family planning.
Observation:
- DNA analysis of chorionic villi was performed at 12 weeks gestation.
- A linked polymorphic DNA marker, DXS95, was utilized for genetic linkage analysis.
- The fetus inherited the allele at risk from the heterozygous mother.
Findings:
- Prenatal testing excluded the inheritance of choroideremia (CHM).
- The specific at-risk allele was not transmitted from the heterozygous mother to the fetus.
- Polymerase chain reaction-single-strand conformation polymorphism (PCR-SSCP) confirmed the exclusion.
Implications:
- This study demonstrates the efficacy of prenatal diagnosis for CHM.
- Early genetic exclusion allows for informed reproductive decisions.
- Advances in molecular diagnostics improve the management of genetic eye diseases.