Abnormal paraplegin expression in swollen neurites, τ- and α-synuclein pathology in a case of hereditary spastic paraplegia SPG7 with an Ala510Val mutation

Dietmar R. Thal, Stephan Züchner, Stephan Gierer, Claudia Schulte, Ludger Schöls, Rebecca Schüle, Matthis Synofzik

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Mutations in the SPG7 gene are the most frequent cause of autosomal recessive hereditary spastic paraplegias and spastic ataxias. Ala510Val is the most common SPG7 mutation, with a frequency of up to 1% in the general population. Here we report the clinical, genetic, and neuropathological findings in a homozygous Ala510Val SPG7 case with spastic ataxia. Neuron loss with associated gliosis was found in the inferior olivary nucleus, the dentate nucleus of the cerebellum, the substantia nigra and the basal nucleus of Meynert. Neurofilament and/or paraplegin accumulation was observed in swollen neurites in the cerebellar and cerebral cortex. This case also showed subcortical τ-pathology in an unique distribution pattern largely restricted to the brainstem. α-synuclein containing Lewy bodies (LBs) were observed in the brainstem and the cortex, compatible with a limbic pattern of Braak LB-Disease stage 4. Taken together, this case shows that the spectrum of pathologies in SPG7 can include neuron loss of the dentate nucleus and the inferior olivary nucleus as well as neuritic pathology. The progressive supranuclear palsy-like brainstem predominant pattern of τ pathology and α-synuclein containing Lewy bodies in our SPG7 cases may be either coincidental or related to SPG7 in addition to neuron loss and neuritic pathology.

Original languageEnglish (US)
Pages (from-to)25050-25066
Number of pages17
JournalInternational journal of molecular sciences
Volume16
Issue number10
DOIs
StatePublished - Oct 21 2015

Keywords

  • Ataxia
  • Coiled bodies
  • Lewy bodies
  • Neurofibrillary tangles
  • Paraplegin
  • SPG7
  • Spastic ataxia
  • Spastic paraplegia
  • Tau

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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