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Molecular assay reagents intended to identify the number of copies of a CAG trinucleotide repeat in a gene\'s DNA. A variation from the expected number of normal CAG trinucleotide repeats produces altered DNA and improper gene functioning, resulting in full mutation. CAG trinucleotide repeats in specific genes are related to particular diseases, including spinocerebellar ataxia type 3 and Huntington\'s disease.
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