Alzheimer disease pathology in cognitively healthy elderly: a genome-wide study.

Published

Journal Article

Many elderly individuals remain dementia-free throughout their life. However, some of these individuals exhibit Alzheimer disease neuropathology on autopsy, evidenced by neurofibrillary tangles (NFTs) in AD-specific brain regions. We conducted a genome-wide association study to identify genetic mechanisms that distinguish non-demented elderly with a heavy NFT burden from those with a low NFT burden. The study included 299 non-demented subjects with autopsy (185 subjects with low and 114 with high NFT levels). Both a genotype test, using logistic regression, and an allele test provided consistent evidence that variants in the RELN gene are associated with neuropathology in the context of cognitive health. Immunohistochemical data for reelin expression in AD-related brain regions added support for these findings. Reelin signaling pathways modulate phosphorylation of tau, the major component of NFTs, either directly or through β-amyloid pathways that influence tau phosphorylation. Our findings suggest that up-regulation of reelin may be a compensatory response to tau-related or beta-amyloid stress associated with AD even prior to the onset of dementia.

Full Text

Duke Authors

Cited Authors

  • Kramer, PL; Xu, H; Woltjer, RL; Westaway, SK; Clark, D; Erten-Lyons, D; Kaye, JA; Welsh-Bohmer, KA; Troncoso, JC; Markesbery, WR; Petersen, RC; Turner, RS; Kukull, WA; Bennett, DA; Galasko, D; Morris, JC; Ott, J

Published Date

  • December 2011

Published In

Volume / Issue

  • 32 / 12

Start / End Page

  • 2113 - 2122

PubMed ID

  • 20452100

Pubmed Central ID

  • 20452100

Electronic International Standard Serial Number (EISSN)

  • 1558-1497

International Standard Serial Number (ISSN)

  • 0197-4580

Digital Object Identifier (DOI)

  • 10.1016/j.neurobiolaging.2010.01.010

Language

  • eng