Abstract:
BACKGROUND:Virtually all adult studies of APOE genotypes and cognition have included individuals over 60. In older adults, epsilon 4 carriers may manifest greater cognitive asymmetries than non-epsilon 4 carriers even in the absence of overall mean differences. General cognitive ability may also be affected by aging and APOE genotype, but most studies have inadequately addressed this potential confound. The goals of this study were to examine, in middle age, the relationship of APOE genotype with episodic memory and verbal-visuospatial episodic memory asymmetries, after accounting for prior general cognitive ability. METHOD:We compared epsilon 4+ and epsilon 4- individuals in 626 male twins in their 50s. We examined verbal and visuospatial episodic memory and verbal-visual asymmetry scores after adjusting for cognitive ability at age 20. Analyses corrected for correlations between twin pair members. RESULTS:Compared with epsilon 4- individuals, epsilon 4 carriers performed significantly more poorly on verbal, but not visuospatial memory, manifested significantly greater cognitive asymmetry, and also had significantly more concerns about memory. At age 20, epsilon 4 carriers had higher general cognitive ability than epsilon 4- individuals, and current memory differences were enhanced after adjusting for age 20 cognitive ability. CONCLUSIONS:Small, but significant, APOE-epsilon 4-related memory deficits appear in the sixth decade of life in individuals who show no signs of preclinical dementia. The results partially support studies of older adults that suggest that increased cognitive asymmetries reflect risk for dementia and are associated with the APOE-epsilon 4 genotype. The results also highlight the potential problems of not having accurate data on prior cognitive ability.
journal_name
Neurologyjournal_title
Neurologyauthors
Schultz MR,Lyons MJ,Franz CE,Grant MD,Boake C,Jacobson KC,Xian H,Schellenberg GD,Eisen SA,Kremen WSdoi
10.1212/01.wnl.0000286941.74372.ccsubject
Has Abstractpub_date
2008-05-06 00:00:00pages
1771-7issue
19 Pt 2eissn
0028-3878issn
1526-632Xpii
01.wnl.0000286941.74372.ccjournal_volume
70pub_type
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