The GGGGCC Repeat Expansion in C9ORF72 in a Case with Discordant Clinical and FDG-PET Findings: PET Trumps Syndrome

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

A hexanucleotide repeat expansion in the chromosome 9 open reading frame 72 (C9ORF72) gene was recently discovered as the cause underlying frontotemporal degeneration (FTD) and/or amyotrophic lateral sclerosis (ALS) linked to chromosome 9 (c9FTD/ALS). In this atypical case of c9FTD/ALS, the proband presented with amnestic mild cognitive impairment which evolved into Alzheimer's disease (AD)-type dementia and later developed ALS. Fluorodeoxyglucose-positron emission tomography of the brain demonstrated mild hypometabolism involving the medial frontal and lateral temporal lobes, left more so than right, which progressed over time. He was subsequently confirmed to have the C9ORF72 expansion. This report highlights the need to consider mutations in the FTD-associated genes when a familial disorder is suggested and neuroimaging studies reveal findings atypical of an AD pathophysiological process despite the typical anterograde amnestic syndrome.

Original languageEnglish (US)
Pages (from-to)110-120
Number of pages11
JournalNeurocase
Volume20
Issue number1
DOIs
StatePublished - Jan 1 2014

Keywords

  • Alzheimer's disease
  • Amyotrophic lateral sclerosis
  • C9ORF72
  • Frontotemporal degeneration
  • Motor neuron disease
  • TDP-43
  • c9FTD/ALS

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Clinical Neurology

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