Given the remarkable similarities between the genetics of tau diseases and the genetics of alpha-synuclein diseases, and given the fact that we have recently found a triplication of the alpha-synuclein locus in a family in which we had shown linkage to the alpha-synuclein locus, we determined to test whether some of the several families with autosomal dominant frontal temporal dementia which show genetic linkage to the tau locus but in which tau mutations have not been found could be caused by similar structural mutations. We did not find any such mutations.

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