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. 1999 Aug;65(2):420–426. doi: 10.1086/302495

Autosomal dominant cerebellar ataxia type III: linkage in a large British family to a 7.6-cM region on chromosome 15q14-21.3.

P F Worth 1, P Giunti 1, C Gardner-Thorpe 1, P H Dixon 1, M B Davis 1, N W Wood 1
PMCID: PMC1377940  PMID: 10417284

Abstract

Autosomal dominant cerebellar ataxia type III (ADCA III) is a relatively benign, late-onset, slowly progressive neurological disorder characterized by an uncomplicated cerebellar syndrome. Three loci have been identified: a moderately expanded CAG trinucleotide repeat in the SCA 6 gene, the SCA 5 locus on chromosome 11, and a third locus on chromosome 22 (SCA 10). We have identified two British families in which affected individuals do not have the SCA 6 expansion and in which the disease is not linked to SCA 5 or SCA 10. Both families exhibit the typical phenotype of ADCA III. Using a genomewide searching strategy in one of these families, we have linked the disease phenotype to marker D15S1039. Construction of haplotypes has defined a 7.6-cM interval between the flanking markers D15S146 and D15S1016, thereby assigning another ADCA III locus to the proximal long-arm of chromosome 15 (SCA 11). We excluded linkage of the disease phenotype to this region in the second family. These results indicate the presence of two additional ADCA III loci and more clearly define the genetic heterogeneity of ADCA III.

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Selected References

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