1. A linkage disequilibrium at the candidate gene locus for 16q-linked autosomal dominant cerebellar ataxia type III in Japan.
- Author
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Takashima M, Ishikawa K, Nagaoka U, Shoji S, and Mizusawa H
- Subjects
- Aged, Case-Control Studies, Family Health, Genes, Dominant, Genetic Markers, Genotype, Haplotypes, Humans, Japan, Middle Aged, Multigene Family, Pedigree, Physical Chromosome Mapping, Cerebellar Ataxia genetics, Chromosomes, Human, Pair 16 genetics, Linkage Disequilibrium
- Abstract
We previously mapped the gene responsible for autosomal dominant cerebellar ataxia (ADCA) type III to a 10.9-cM interval between D16S3089 and D16S515 on chromosome 16q. This region, however, was identical to the candidate locus of spinocerebellar ataxia type 4 (SCA4). In this study, we extended our research to refine the gene locus of the disease by applying linkage disequilibrium with 20 microsatellite DNA markers. With 9 markers flanked by D16S3031 and D16S3107, we found that the affected individuals in six families had a common haplotype on their disease chromosomes. Furthermore, linkage disequilibrium was demonstrated with 5 informative markers: D16S3019 (P = 0.013), D16S3067 (P = 0.008), D16S3141 (P = 0.011), D16S496 (P = 0.032), and D16S3107 (P = 0.000). These results indicate that the disease could have originated from a common ancestor harboring a mutation within a less than 3-cM region between D16S3043 and D16S3095. The founder alleles were also observed in other patients with ADCA type III unrelated to the six families.
- Published
- 2001
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