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A novel locus for dominant cerebellar ataxia (SCA14) maps to a 10.2‐cM interval flanked by D19S206 and D19S605 on chromosome 19q13.4‐qter
Author(s) -
Yamashita Isao,
Sasaki Hidenao,
Yabe Ichiro,
Fukazawa Toshiyuki,
Nogoshi Shinji,
Komeichi Katsuhide,
Takada Akio,
Shiraishi Kazuya,
Takiyama Yoshihisa,
Nishizawa Masatoyo,
Kaneko Jin,
Tanaka Hajime,
Tsuji Shoji,
Tashiro Kunio
Publication year - 2000
Publication title -
annals of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.764
H-Index - 296
eISSN - 1531-8249
pISSN - 0364-5134
DOI - 10.1002/1531-8249(200008)48:2<156::aid-ana4>3.0.co;2-9
Subject(s) - ataxia , locus (genetics) , cerebellar ataxia , genetics , medicine , biology , neuroscience , gene
Dominantly inherited, late‐onset pure cerebellar ataxia is a group of genetically heterogeneous neurodegenerative disorders. Approximately half of these disorders in the Japanese population are caused by moderate expansion of a CAG repeat in the coding region of the CACNA1A gene on chromosome 19p13 (SCA6). However, neither the loci nor the specific mutations for the remaining disorders have been determined. We performed systematic linkage analysis in a three‐generation Japanese family with a locus or mutation that differed from those of known spinocerebellar ataxias. The family members with a late onset (≥39 years old) exhibited pure cerebellar ataxia, whereas those with an early onset (≤27 years old) first showed intermittent axial myoclonus followed by ataxia. Other neurological signs were sparse, and neuroimaging studies revealed that atrophy was confined to the cerebellum. Multipoint analysis and haplotype reconstruction ultimately traced this novel spinocerebellar ataxia locus (SCA14) to a 10.2‐cM interval flanked by D19S206 and D19S605 on chromosome 19q13.4‐qter (Zmax = 4.08, corrected for age‐dependent penetrance). Ann Neurol 2000;48:156–163

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