Axonal neuropathy in female carriers of the fragile X premutation with fragile x-associated tremor ataxia syndrome

Suresh Ram, Inoka A. Devapriya, Grace Fenton, Lindsey McVay, Danh V. Nguyen, Flora Tassone, Ricardo A Maselli, Randi J Hagerman

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Introduction: In this study we examined whether females with the fragile X-associated tremor ataxia syndrome (FXTAS) and non-FXTAS premutation carriers have electrophysiological signs of underlying peripheral neuropathy. Methods: Nerve conduction studies (NCS) were performed on 19 women with FXTAS, 20 non-FXTAS carriers, and 26 age-matched controls. The results were compared with existing data on corresponding male carriers. Results: Women with FXTAS and non-FXTAS carriers had reduced sensory nerve action potential amplitudes. Also, there was a strong trend for reduced compound muscle action potential amplitudes in women with FXTAS, but not in non-FXTAS carriers. No significant slowing of nerve conduction velocities, prolongation of F-wave latencies, or associations with molecular measures was observed. Conclusions: This study suggests an underlying axonal neuropathy in women with FXTAS. However, in comparison to men with FXTAS, the NCS abnormalities in women were less severe, possibly due to the effect of a normal X chromosome.

Original languageEnglish (US)
Pages (from-to)234-239
Number of pages6
JournalMuscle and Nerve
Volume52
Issue number2
DOIs
StatePublished - Aug 1 2015

Keywords

  • FMR1
  • Fragile X permutation
  • Fragile X-associated tremor ataxia syndrome
  • FXTAS
  • Nerve conduction studies

ASJC Scopus subject areas

  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)
  • Physiology

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