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Clinical features and molecular genetics of spinocerebellar ataxia type 14(SCA14) Ichiro YABE 1 , Hidenao SASAKI 1 1Department of Neurology, Hokkaido University Graduate School of Medicine Keyword: spinocerebellar ataxia type 14 , SCA14 , protein kinase C gamma , PRKCG , inositol phosphate , myoclonus pp.347-353
Published Date 2006/6/10
DOI https://doi.org/10.11477/mf.1431100142

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  • Abstract
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About 30% of hereditary spinocerebellar degeneration is still of unknown etiology. We previously identified spinocerebellar ataxia type 14(SCA14)in a single Japanese family with an autosomal dominant neurodegenerative condition characterized by cerebellar ataxia and intermittent axial myoclonus. Subsequently, we showed that this condition was caused by mutation of the protein kinase C gamma(PRKCG)gene. To date, 19 SCA14 families have been reported in various countries. Although involuntary movements, cognitive dysfunction, depression, and extrapyramidal signs were seen in some of these patients, cerebellar ataxia was the predominant symptom. Mutations causing SCA14 were mainly concentrated in the C1 regulatory domain of PRKCG, where Ca2+ and diacylglycerol interact. However, the function of the inositol phosphate and PRKCG signaling systems, as well as the molecular mechanisms of SCA14, are not well understood, especially since PRKCG is not only expressed in the cerebellum but is also found in various other parts of the central nervous system. Further studies are needed to clarify the role of this signaling system in the central nervous system.


Copyright © 2006, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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