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- W2094705407 abstract "The SCA7 mutation has been found in 54 patients and 7 at-risk subjects from 17 families who have autosomal dominant cerebellar ataxia (ADCA) II with progressive pigmentary maculopathy. In one isolated case, haplotype reconstruction through three generations confirmed a de novo mutation owing to paternal meiotic instability. Different disease-associated haplotypes segregated among the SCA7-positive kindreds, which indicated a multiple origin of the mutation. One family with the clinical phenotype of ADCA type II did not have the CAG expansion that indicated locus heterogeneity. The distribution of the repeat size in 944 independent normal chromosomes from controls, unaffected at-risk subjects, and one affected individual fell into two ranges. The majority of the alleles were in the first range of 7–19 CAG repeats. A second range could be identified with 28–35 repeats, and we provide evidence that these repeats represent intermediate alleles that are prone to further expansion. The repeat size of the pathological allele, the widest reported for all CAG-repeat disorders, ranged from 37 to ∼220. The repeat size showed significant negative correlation with both age at onset and age at death. Analysis of the clinical features in the patients with SCA7 confirmed that the most frequently associated features are pigmentary maculopathy, pyramidal tract involvement, and slow saccades. The subjects with <49 repeats tended to have a less complicated neurological phenotype and a longer disease duration, whereas the converse applied to subjects with ⩾49 repeats. The degree of instability during meiotic transmission was greater than in all other CAG-repeat disorders and was particularly striking in paternal transmission, in which a median increase in repeat size of 6 and an interquartile range of 12 were observed, versus a median increase of 3 and interquartile range of 3.5 in maternal transmission." @default.
- W2094705407 created "2016-06-24" @default.
- W2094705407 creator A5084853134 @default.
- W2094705407 date "1998-01-01" @default.
- W2094705407 modified "2023-09-26" @default.
- W2094705407 title "Spinocerebellar ataxia type 6 (SCA 6)" @default.
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- W2094705407 doi "https://doi.org/10.1016/s0168-0102(98)81604-0" @default.
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