TABLE 4.  Examples of genetic tests currently commercially available for presymptomatic or prenatal testing

Alpha thalassemia

Breast cancer risk (BRCA1 and BRCA2 genes)

Cystic fibrosis

Epidermolysis bullosa simplex

Fragile X mental retardationa

Huntington’s diseasea

Kennedy’s diseasea

Myotonic dystrophya

Sickle-cell anemia

Spinocerebellar ataxia type 1 (SCA1)a

Spinocerebellar ataxia type 3 (SCA3/Machado-Joseph disease)a

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published 2000