APOE and AD concordance in twin pairs as predictors of AD in first-degree relatives.

Published

Journal Article

OBJECTIVE: To examine the independent effects of the APOE genotype (APOE) and concordance for AD in twin pairs on the occurrence of AD in first-degree relatives. BACKGROUND: Studies of twins have been undertaken to investigate the influence of genes in a variety of conditions, including AD. A previous study, performed before reports linking APOE to AD, demonstrated an increase in AD among first-degree relatives of twins concordant for AD compared with relatives of discordant twins. METHODS: In a sample of 94 twin pairs the authors examined the association between concordance for AD within the twin pair and family history of AD among first-degree relatives of twins. They then examined the extent to which the presence of the APOE epsilon4 allele in the twin pair explains the association between concordance for AD within the twin pair and family history of AD. RESULTS: Concordance among twins was associated with increased risk of AD among relatives (logrank test, chi2 = 12.558; p = 0.0004), and the presence of at least one APOE epsilon4 allele in each member of the twin pair is also associated with increased risk of AD among family members (logrank test, chi2 = 7.712; p = 0.0055). CONCLUSIONS: APOE genotype explains much but not all of the association between concordance among twins and increased familial risk of AD.

Full Text

Duke Authors

Cited Authors

  • Steffens, DC; Plassman, BL; Helms, MJ; Welsh-Bohmer, KA; Newman, TT; Breitner, JC

Published Date

  • February 8, 2000

Published In

Volume / Issue

  • 54 / 3

Start / End Page

  • 593 - 598

PubMed ID

  • 10680788

Pubmed Central ID

  • 10680788

International Standard Serial Number (ISSN)

  • 0028-3878

Digital Object Identifier (DOI)

  • 10.1212/wnl.54.3.593

Language

  • eng

Conference Location

  • United States