Journal
NEUROLOGY
Volume 71, Issue 5, Pages 332-336Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1212/01.wnl.0000319646.23052.d1
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Background: Autosomal recessive hereditary spastic paraparesis with thin corpus callosum (ARHSP-TCC) is being increasingly recognized as a variety of spastic paraplegia with mental retardation. SPG11 gene mutations have been reported to be associated with ARHSP-TCC. Methods: As an independent group, we investigated SPG11 gene involvement in four individuals not previously described with either recessive or sporadic HSP-TCC presentation. Results: Chromosome 15q13-15 segregating autosomal disease haplotypes were different across the kindreds and sequencing of SPG11 identified four novel frameshift/nonsense segregating mutations and the R2034X mutation, which were in heterozygous compound status. The affected examined had decreased thalamic and bilateral paracentral frontal lobe metabolism on F-18-flurodeoxyglucose PET. Conclusions: Loss-of-function SPG11 mutations are the major cause of autosomal recessive hereditary spastic paraparesis with thin corpus callosum in Southern Europe, even in apparently sporadic cases. Decreased thalamic metabolism was consistently a phenotypical SPG11 mutation hallmark.
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