Molecular and imaging correlates of the fragile X-associated tremor/ataxia syndrome

S. Cohen, K. Masyn, J. Adams, David R Hessl, S. Rivera, Flora Tassone, James A Brunberg, Charles DeCarli, Lin Zhang, J. Cogswell, D. Loesch, M. Leehey, J. Grigsby, Paul J Hagerman, Randi J Hagerman

Research output: Contribution to journalArticle

109 Scopus citations

Abstract

OBJECTIVES: To assess changes in regional brain volumes associated with the fragile X-associated tremor/ataxia syndrome (FXTAS) and the molecular correlates of these changes. METHODS: We administered molecular, MRI, and neurocognitive tests to 36 male premutation carriers (ages 51 to 79), 25 affected and 11 unaffected with FXTAS, and to 21 control subjects of similar age and education. RESULTS: We found differences among the three groups in whole brain, cerebrum, cerebellum, ventricular volume, and whole-brain white matter hyperintensity, with the affected group showing significantly more pathology than the control and unaffected groups. Brainstem volume was significantly smaller in the unaffected group vs controls but did not differ from the affected group. Within the premutation sample, CGG repeat length correlated with reductions in IQ and cerebellar volume and increased ventricular volume and whole-brain white matter hyperintensity. CONCLUSIONS: The current findings, coupled with recent evidence linking the degree of neuropathology (numbers of intranuclear inclusions) to the size of the premutation allele, provide evidence that the neurodegenerative phenotype in the fragile X-associated tremor/ataxia syndrome is a consequence of the CGG repeat expansion.

Original languageEnglish (US)
Pages (from-to)1426-1431
Number of pages6
JournalNeurology
Volume67
Issue number8
DOIs
StatePublished - Oct 2006

ASJC Scopus subject areas

  • Neuroscience(all)

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