APOE ε4 influences β-amyloid deposition in primary progressive aphasia and speech apraxia

Keith A. Josephs, Joseph R. Duffy, Edythe A. Strand, Mary M. MacHulda, Matthew L. Senjem, Val J. Lowe, Clifford R. Jack, Jennifer L. Whitwell

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Background Apolipoprotein E ε4 (APOE ε4) is a risk factor for β-amyloid deposition in Alzheimer's disease dementia. Its influence on β-amyloid deposition in speech and language disorders, including primary progressive aphasia (PPA), is unclear. Methods One hundred thirty subjects with PPA or progressive speech apraxia underwent APOE genotyping and Pittsburgh compound B (PiB) PET scanning. The relationship between APOE ε4 and PiB status, as well as severity and regional distribution of PiB, was assessed. Results Forty-five subjects had an APOE ε4 allele and 60 subjects were PiB-positive. The odds ratio for a subject with APOE ε4 being PiB-positive compared with a subject without APOE ε4 being PiB-positive was 10.2 (95% confidence interval, 4.4-25.5; P <.0001). The APOE ε4 allele did not influence regional PiB distribution or severity. Conclusion APOE ε4 increases the risk of β-amyloid deposition in PPA and progressive speech apraxia but does not influence regional β-amyloid distribution or severity.

Original languageEnglish (US)
Pages (from-to)630-636
Number of pages7
JournalAlzheimer's and Dementia
Volume10
Issue number6
DOIs
StatePublished - Nov 1 2014

Keywords

  • Apolipoprotein
  • Logopenic aphasia
  • Pittsburgh compound B
  • Primary progressive aphasia
  • Speech apraxia

ASJC Scopus subject areas

  • Epidemiology
  • Health Policy
  • Developmental Neuroscience
  • Clinical Neurology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health
  • Cellular and Molecular Neuroscience

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