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• W2023767340 abstract "Abstract Objective Hereditary spastic paraplegias (HSPs) comprise a heterogeneous group of neurodegenerative disorders resulting in progressive spasticity of the lower limbs. One form of autosomal recessive hereditary spastic paraplegia (ARHSP) with thin corpus callosum (TCC) was linked to chromosomal region 15q13‐21 (SPG11) and associated with mutations in the spatacsin gene. We assessed the long‐term course and the mutational spectrum of spatacsin ‐associated ARHSP with TCC. Methods Neurological examination, cerebral magnetic resonance imaging (MRI), 18 fluorodeoxyglucose positron emission tomography (PET), nerve biopsy, linkage and mutation analysis are presented. Results Spastic paraplegia in patients with spatacsin mutations (n = 20) developed during the second decade of life. The Spastic Paraplegia Rating Scale (SPRS) showed severely compromised walking between the second and third decades of life (mean SPRS score, >30). Impaired cognitive function was associated with severe atrophy of the frontoparietal cortex, TCC, and bilateral periventricular white matter lesions. Progressive cortical and thalamic hypometabolism in the 18 fluorodeoxyglucose PET was observed. Sural nerve biopsy showed a loss of unmyelinated nerve fibers and accumulation of intraaxonal pleomorphic membranous material. Mutational analysis of spatacsin demonstrated six novel and one previously reported frameshift mutation and two novel nonsense mutations. Furthermore, we report the first two splice mutations to be associated with SPG11. Interpretation We demonstrate that not only frameshift and nonsense mutations but also splice mutations result in SPG11. Mutations are distributed throughout the spatacsin gene and emerge as major cause for ARHSP with TCC associated with severe motor and cognitive impairment. The clinical phenotype and the ultrastructural analysis suggest a disturbed axonal transport of long projecting neurons. Ann Neurol 2007" @default.
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• W2023767340 date "2007-12-01" @default.
• W2023767340 modified "2023-10-18" @default.
• W2023767340 title "Long-term course and mutational spectrum of<i>spatacsin</i>-linked spastic paraplegia" @default.
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• W2023767340 doi "https://doi.org/10.1002/ana.21310" @default.
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