Impairment of memory generalization in preclinical autosomal dominant Alzheimer's disease mutation carriers

Neurobiol Aging. 2018 May;65:149-157. doi: 10.1016/j.neurobiolaging.2018.01.022. Epub 2018 Feb 8.

Abstract

Fast, inexpensive, and noninvasive identification of Alzheimer's disease (AD) before clinical symptoms emerge would augment our ability to intervene early in the disease. Individuals with fully penetrant genetic mutations causing autosomal dominant Alzheimer's disease (ADAD) are essentially certain to develop the disease, providing a unique opportunity to examine biomarkers during the preclinical stage. Using a generalization task that has previously shown to be sensitive to medial temporal lobe pathology, we compared preclinical individuals carrying ADAD mutations to noncarrying kin to determine whether generalization (the ability to transfer previous learning to novel but familiar recombinations) is vulnerable early, before overt cognitive decline. As predicted, results revealed that preclinical ADAD mutation carriers made significantly more errors during generalization than noncarrying kin, despite no differences between groups during learning or retention. This impairment correlated with the left hippocampal volume, particularly in mutation carriers. Such identification of generalization deficits in early ADAD may provide an easily implementable and potentially linguistically and culturally neutral way to identify and track cognition in ADAD.

Keywords: Alzheimer's disease; Amyloid precursor protein; Associative learning; Early onset; Generalization; Hippocampus; Mutation; Preclinical; Presenilin 1.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Alzheimer Disease / diagnostic imaging
  • Alzheimer Disease / genetics*
  • Alzheimer Disease / pathology
  • Alzheimer Disease / psychology*
  • Amyloid beta-Protein Precursor
  • Apolipoproteins E / genetics*
  • Association Learning / physiology
  • Cognition
  • Female
  • Generalization, Psychological / physiology*
  • Genes, Dominant / genetics*
  • Heterozygote*
  • Hippocampus / diagnostic imaging
  • Hippocampus / pathology
  • Humans
  • Magnetic Resonance Imaging
  • Male
  • Memory / physiology*
  • Middle Aged
  • Mutation / genetics*
  • Organ Size
  • Presenilin-1
  • Young Adult

Substances

  • Amyloid beta-Protein Precursor
  • ApoE protein, human
  • Apolipoproteins E
  • Presenilin-1