SCA28: Novel Mutation in the AFG3L2 Proteolytic Domain Causes a Mild Cerebellar Syndrome with Selective Type-1 Muscle Fiber Atrophy

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Kirsten Svenstrup, Troels Tolstrup Nielsen, Frederik Aidt, Nina Rostgaard, Morten Duno, Flemming Wibrand, Tua Vinther-Jensen, Ian Law, John Vissing, Peter Roos, Lena Elisabeth Hjermind, Jørgen Erik Nielsen

The spinocerebellar ataxias (SCA) are a group of rare inherited neurodegenerative diseases characterized by slowly progressive cerebellar ataxia, resulting in unsteady gait, clumsiness, and dysarthria. The disorders are predominantly inherited in an autosomal dominant manner. Mutations in the gene AFG3L2 that encodes a subunit of the mitochondrial m-AAA protease have previously been shown to cause spinocerebellar ataxia type 28 (SCA28). Here, we present the clinical phenotypes of three patients from a family with autosomal dominant cerebellar ataxia and show by molecular genetics and in silico modelling that this is caused by a novel missense mutation in the AFG3L2 gene. Furthermore, we show, for the first time, fluorodeoxyglucose-positron emission tomography (FDG-PET) scans of the brain and selective type I fiber atrophy of skeletal muscle of SCA28 patients indicating non-nervous-system involvement in SCA28 as well.
Original languageEnglish
JournalThe Cerebellum
Volume16
Issue number1
Pages (from-to)62-67
Number of pages6
ISSN1473-4222
DOIs
Publication statusPublished - Feb 2017

ID: 166271277