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• W2013441760 abstract "<h3>Objective:</h3> Mutations in <i>SLC2A1</i>, encoding the glucose transporter type 1 (GLUT1), cause a broad spectrum of neurologic disorders including classic GLUT1 deficiency syndrome, paroxysmal exercise-induced dyskinesia (PED, DYT18), and absence epilepsy. A large German/Dutch pedigree has formerly been described as paroxysmal choreoathetosis/spasticity (DYT9) and linked close to but not including the <i>SLC2A1</i> locus on chromosome 1p. We tested whether 1) progressive spastic paraparesis, in addition to PED, as described in DYT9, and 2) autosomal dominant forms of hereditary spastic paraparesis (HSP) without PED are caused by <i>SLC2A1</i> defects. <h3>Methods:</h3> The German/Dutch family and an Australian monozygotic twin pair were clinically (re-)investigated, and 139 index cases with dominant or sporadic HSP in which relevant dominant genes were partially excluded were identified from databanks. <i>SLC2A1</i> was sequenced in all cases in this observational study and the functional effects of identified sequence variations were tested in glucose uptake and protein expression assays. <h3>Results:</h3> We identified causative mutations in <i>SLC2A1</i> in both families, which were absent in 400 control chromosomes, cosegregated with the affection status, and decreased glucose uptake in functional assays. In the 139 index patients with HSP without paroxysmal dyskinesias, we only identified one sequence variation, which, however, neither decreased glucose uptake nor altered protein expression. <h3>Conclusions:</h3> This study shows that DYT9 and DYT18 are allelic disorders and enlarges the spectrum of GLUT1 phenotypes, now also including slowly progressive spastic paraparesis combined with PED. <i>SLC2A1</i> mutations were excluded as a cause of HSP without PED in our cohort." @default.
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• W2013441760 date "2011-08-10" @default.
• W2013441760 modified "2023-10-14" @default.
• W2013441760 title "Paroxysmal choreoathetosis/spasticity (DYT9) is caused by a GLUT1 defect" @default.
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• W2013441760 doi "https://doi.org/10.1212/wnl.0b013e31822e0479" @default.
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