Moderate expansion of a normally biallelic trinucleotide repeat in spinocerebellar ataxia type 2
Copyright policy )Moderate expansion of a normally biallelic trinucleotide repeat in spinocerebellar ataxia type 2
The gene for spinocerebellar ataxia type 2 (SCA2) has been mapped to 12q24.1. A 1.1-megabase contig in the candidate region was assembled in P1 artificial chromosome and bacterial artificial chromosome clones. Using this contig, we identified a CAG trinucleotide repeat with CAA interruptions that was expanded in patients with SCA2. In contrast to other unstable trinucleotide repeats, this CAG repeat was not highly polymorphic in normal individuals. In SCA2 patients, the repeat was perfect and expanded to 36-52 repeats. The most common disease allele contained (CAG)37, one of the shortest expansions seen in a CAG expansion syndrome. The repeat occurs in the 5'-coding region of SCA2 which is a member of a novel gene family.
- University of California, Los Angeles United States
- Roswell Park Cancer Institute United States
- University of Duesseldorf Germany
- Cedars-Sinai Medical Center United States
- Heinrich Heine University Düsseldorf Germany
Chromosomes, Human, Pair 12, DNA, Complementary, Base Sequence, Sequence Homology, Amino Acid, Molecular Sequence Data, Chromosome Mapping, Proteins, Nerve Tissue Proteins, Sequence Analysis, DNA, Ataxins, Gene Expression Regulation, Trinucleotide Repeats, Humans, Amino Acid Sequence, Spinocerebellar Degenerations
Chromosomes, Human, Pair 12, DNA, Complementary, Base Sequence, Sequence Homology, Amino Acid, Molecular Sequence Data, Chromosome Mapping, Proteins, Nerve Tissue Proteins, Sequence Analysis, DNA, Ataxins, Gene Expression Regulation, Trinucleotide Repeats, Humans, Amino Acid Sequence, Spinocerebellar Degenerations
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