Phenotypic Variability of parkin Mutations in Single Kindred
Identifieur interne : 001027 ( Main/Curation ); précédent : 001026; suivant : 001028Phenotypic Variability of parkin Mutations in Single Kindred
Auteurs : Brianada Koentjoro [Australie] ; Jin-Sung Park [Australie] ; Ainhi Duy Ha [Australie] ; Carolyn M. Sue [Australie]Source :
- Movement disorders [ 0885-3185 ] ; 2012.
Descripteurs français
- Pascal (Inist)
English descriptors
Abstract
Background: Mutations in parkin have been associated with autosomal recessive early-onset Parkinson's disease (PD). Here, we report on unusual phenotypic variability within a family with mutations in parkin. Methods: The proband and her parents were clinically assessed. Mutation analysis was performed using genomic DNA and complementary DNA. The protein expression of Parkin and Mitofusin 2 was examined by western blotting. Results: The proband was a compound heterozygote with no detectable Parkin and presented with early-onset PD. The father, a single heterozygote with reduced expression of Parkin, had mild loss of arm swing. The mother, who had only very mild rigidity, was unexpectedly found to be a homozygote with no Parkin expression. The proband, but not the parents, met the Queen Square Brain Bank criteria for PD. Parkin-dependent ubiquitination of Mitofusin 2 was impaired in the mother and the proband. Conclusion: We report the first case of a homozygous mutation carrier in parkin who had no functional protein and only mild signs of parkinsonism in her seventh decade, whereas her daughter developed typical early-onset PD. This family demonstrates phenotypic variability in parkin-related parkinsonism.
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<front><div type="abstract" xml:lang="en">Background: Mutations in parkin have been associated with autosomal recessive early-onset Parkinson's disease (PD). Here, we report on unusual phenotypic variability within a family with mutations in parkin. Methods: The proband and her parents were clinically assessed. Mutation analysis was performed using genomic DNA and complementary DNA. The protein expression of Parkin and Mitofusin 2 was examined by western blotting. Results: The proband was a compound heterozygote with no detectable Parkin and presented with early-onset PD. The father, a single heterozygote with reduced expression of Parkin, had mild loss of arm swing. The mother, who had only very mild rigidity, was unexpectedly found to be a homozygote with no Parkin expression. The proband, but not the parents, met the Queen Square Brain Bank criteria for PD. Parkin-dependent ubiquitination of Mitofusin 2 was impaired in the mother and the proband. Conclusion: We report the first case of a homozygous mutation carrier in parkin who had no functional protein and only mild signs of parkinsonism in her seventh decade, whereas her daughter developed typical early-onset PD. This family demonstrates phenotypic variability in parkin-related parkinsonism.</div>
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