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Striking phenotypic variation in a family with the P506S UBQLN2 mutation including amyotrophic lateral sclerosis, spastic paraplegia and frontotemporal dementia

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Original languageEnglish
Pages (from-to)229.e5-229.e9
JournalNeurobiology of Aging
Volume73
Early online date24 Aug 2018
DOIs
Accepted/In press15 Aug 2018
E-pub ahead of print24 Aug 2018
PublishedJan 2019

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Abstract

Analysis of 226 exome-sequenced UK cases of familial amyotrophic lateral sclerosis (ALS) and frontotemporal dementia identified 2 individuals who harbored a P497H and P506S UBQLN2 mutation, respectively (n = 0.9%). The P506S index case presented with behavioral variant frontotemporal dementia at the age of 54 years then progressed to ALS surviving 3 years. Three sons presented with (1) slowly progressive pure spastic paraplegia with an onset at 25 years and (2) ALS with disease onset of 25 years and survival of 2 years, and (3) ALS presenting symptoms at the age of 26 years, respectively. Analysis of postmortem tissue from the index case revealed frequent neuronal cytoplasmic UBQLN2-positive inclusions in the dentate gyrus and TDP-43-positive neuronal cytoplasmic inclusions in the frontal and temporal cortex and granular cell layer of the dentate gyrus of the hippocampus. Furthermore, a comprehensive analysis of published UBQLN2 mutations demonstrated that only proline-rich domain mutations contribute to a significantly earlier age of onset in male patients (p = 0.0026).

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