Table 1. Summary of Molecular Genetic Testing Used in SCA1
| Gene | Test Method | Mutation Detected | Mutation Detection Frequency by Test Method 1 | 
| ATXN1 | ≤ ~100 CAG repeats | >99% | |
| Targeted mutation analysis (Southern blot, long-range PCR, CAG-primed PCR) | > ~100 CAG repeats | <1% 2 | 
1. The ability of the test method used to detect a mutation that is present in the indicated gene
2. Typically observed in individuals with infantile or childhood onset in families with SCA1
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