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Fabry disease: twenty novel alpha-galactosidase A mutations causing the classical phenotype
G A Ashley1, J Shabbeer, M Yasuda
1Department of Human Genetics, Mount Sinai School of Medicine, New York, NY 10029, USA.
Journal of Human Genetics
|April 27, 2001
Summary
Researchers identified 20 new mutations in the alpha-galactosidase A (alpha-Gal A) gene in Fabry disease patients. This genetic discovery aids in precise heterozygote detection and prenatal diagnosis for this rare disorder.
Area of Science:
- Biochemistry
- Genetics
- Lysosomal Storage Diseases
Background:
- Fabry disease is an X-linked disorder caused by deficient alpha-galactosidase A (alpha-Gal A) activity.
- This deficiency leads to glycosphingolipid accumulation, impacting cellular function.
Purpose of the Study:
- To characterize molecular lesions in the alpha-Gal A gene in families with classic Fabry disease.
- To enable precise heterozygote detection and prenatal diagnosis.
- To investigate potential genotype/phenotype correlations.
Main Methods:
- Genomic DNA was isolated from affected males.
- The alpha-Gal A coding region and flanking introns were analyzed using PCR amplification and automated sequencing.
Main Results:
- Twenty novel mutations in the alpha-Gal A gene were identified.
- Seventeen previously reported mutations were also detected in other families.
- This expands the known mutational spectrum for classic Fabry disease.
Conclusions:
- The study defines the heterogeneity of alpha-Gal A gene mutations causing classic Fabry disease.
- These findings are crucial for accurate genetic counseling, heterozygote screening, and prenatal diagnosis.