Human Molecular Genetics, Vol 7, 1301-1309, Copyright © 1998 by Oxford University Press
T Nechiporuk, DP Huynh, K Figueroa, S Sahba, A Nechiporuk and SM Pulst
Spinocerebellar ataxia type 2 (SCA2) is caused by expansion of a CAG
trinucleotide repeat located in the coding region of the human SCA2 gene.
Sequence analysis revealed that SCA2 is a novel gene of unknown function.
In order to provide insights into the molecular mechanisms of pathogenesis
of SCA2 and to identify conserved domains, we isolated and characterized
the mouse homolog of the SCA2 gene. Sequence and amino acid analysis
revealed 89% identity at the nucleotide and 91% identity at the amino acid
level. However, there was no extended polyglutamine tract in the mouse SCA2
cDNA, suggesting that the normal function of SCA2 is not dependent on this
domain. Northern blot analysis of different mouse tissues indicated that
the mouse SCA2 gene was expressed in most tissues, but at varying levels.
Alternative splicing seen in human SCA2 was conserved in the mouse. By
northern blot analysis, SCA2 was expressed during embryogenesis as early as
day 8 of gestation (E8). Immunohistochemical staining using
affinity-purified antibodies demonstrated that ataxin 2 was expressed in
the cytoplasm of Purkinje cells as well as in other neurons of the CNS.
ARTICLES
The mouse SCA2 gene: cDNA sequence, alternative splicing and protein expression
Rose Moss Laboratory for Parkinson's and Neurodegenerative Diseases, CSMC Burns and Allen Research Institute and Division of Neurology, Cedars-Sinai Medical Center, UCLA School of Medicine, Los Angeles, CA 90048, USA.
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