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Molecular assay reagents intended to identify CAG repeats in the calcium channel, voltage-dependent, P/Q type, alpha 1A subunit (CACNA1A) gene, located at chromosome 19p13. Normal alleles have from 4 to 18 CAG repeats. A variation from the expected number of normal CAG trinucleotide repeat copies may produce altered DNA and improper gene functioning, resulting in full mutation. Alleles with 20 to 30 CAG trinucleotide repeats have been associated with spinocerebellar ataxia type 6 (SCA6).
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