Novel Compound Heterozygous Spatacsin Mutations in a Greek Kindred with Hereditary Spastic Paraplegia SPG11 and Dementia.
SPG11 belongs to the autosomal recessive hereditary spastic paraplegias (HSP) and presents during childhood or puberty with a complex clinical phenotype encompassing learning difficulties, ataxia, peripheral neuropathy, amyotrophy, and mental retardation. We hereby present the case of a 30-year-old female patient with complex autosomal recessive HSP with thinning of the corpus callosum (TCC) and dementia that was compound heterozygous with two novel mutations in the SPG11 gene. Sequence analysis of the SPG11 gene revealed two novel mutations in a compound heterozygous state in the index patient (c.2431C>T/p.Gln811Ter and c.6755_6756insT/p.Glu2252Aspfs*88). MRI showed abnormal TCC, white matter (WM) hyperintensities periventricularly, and the 'ears of the lynx' sign. Diffusion tensor imaging showed a mild-to-moderate decrease in fractional anisotropy and an increase in mean diffusivity in WM compared to age-matched controls, while magnetic resonance spectroscopy showed abnormal findings in affected WM with a decrease in N-acetyl-aspartate in WM regions of interest. This is the first SPG11 kindred from the Greek population to be reported in the medical literature.
NEURORARE Centre for Rare and Genetic Neurological and Neuromuscular Diseases and Neurogenetics, Athens, Greece.
Matthew J
MJ
Fraidakis
Maura
M
Brunetti
Craig
C
Blackstone
Massimo
M
Filippi
Adriano
A
Chiò
D000328:Adult; D001921:Brain / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D003337:Corpus Callosum / Q000000981:diagnostic imaging / Q000473:pathology; D003704:Dementia / Q000150:complications / Q000000981:diagnostic imaging / Q000235:genetics* / Q000473:pathology; D056324:Diffusion Tensor Imaging; D005260:Female; D006115:Greece; D006579:Heterozygote; D006801:Humans; D008279:Magnetic Resonance Imaging; D009682:Magnetic Resonance Spectroscopy; D009154:Mutation; D010375:Pedigree; D011506:Proteins / Q000235:genetics*; D015419:Spastic Paraplegia, Hereditary / Q000150:complications / Q000000981:diagnostic imaging / Q000235:genetics* / Q000473:pathology; D044465:White People / Q000235:genetics
D011506:Proteins; C520412:SPG11 protein, human