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1 Journal of Applied Genetics

1 2005

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Genotype/phenotype correlation in a SCA1 family: anticipation without CAG expansion

100%

Bauer P. O. , Matoska V. , Zumrova A. , Boday A. , Doi H. , Marikova T. , Goetz P.

nr 3

325-328

We report on a family with spinocerebellar ataxia type 1 (SCA1), in which the age at onset and the severity of the disease do not correlate with the number of CAG repeat units. Although a marked anticipation was observed in the proband, it was not a consequence of an expansion of the CAG tract. None of the expanded alleles contained CAT interruptions. The pathologic expansion in this family was stable during the paternal but not maternal transmission, where it expanded by one trinucleotide and unexpectedly did not lead to anticipation. Our observations suggest that factors other than the length of the CAG repeat play a considerable role in determination of the disease course.