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Premutations in the FMR1 gene may be associated with some cases of parkinsonism. To test this hypothesis, we determined the CGG repeat number in FMR1 in 673 individuals with and without parkinsonism and detected 3 premutation carriers (2 patients, 1 control). Of note, 1 of the affected premutation carriers had a heterozygous Parkin mutation.
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Hedrich et al. (2005) studied this question.
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