Abstract:
OBJECTIVE:To determine, in a cross-sectional evaluation of nondemented individuals, if age-related memory decline is influenced by apolipoprotein E (apoE) genotype. BACKGROUND:The apoE-4 allele is an important risk factor for AD. PET in cognitively normal apoE-4 carriers (mean age, 56 years) shows reduced cerebral metabolism suggestive of very early AD that precedes clinically evident memory loss or MRI-based hippocampal atrophy. METHODS:Tests of immediate and delayed recall (primary outcome measures) and other neuropsychological measures (secondary outcome measures) were given to three genetically defined groups of cognitively normal individuals (age, 49 to 69 years) including apoE-4 homozygotes (n = 25), apoE-4 heterozygotes (n = 25, all epsilon3/4), and apoE-4 noncarriers (n = 50). Groups were matched for age, gender, and educational background. Cross-sectional comparisons between the genetic subgroups of the relationship between age and test score were performed for each neuropsychological measure. RESULTS:There were no intergroup differences in mean scores on any neuropsychological measure, but tests sensitive to immediate and delayed recall showed a significant negative correlation with age in the apoE-4 homozygote group relative to the noncarrier group. CONCLUSION:Consistent with previous neuropsychological studies of early AD, this cross-sectional study suggests that age-related memory decline occurs earlier in cognitively healthy apoE-4 homozygotes than in apoE-4 heterozygotes and noncarriers, and precedes clinically detectable AD.
journal_name
Neurologyjournal_title
Neurologyauthors
Caselli RJ,Graff-Radford NR,Reiman EM,Weaver A,Osborne D,Lucas J,Uecker A,Thibodeau SNdoi
10.1212/wnl.53.1.201subject
Has Abstractpub_date
1999-07-13 00:00:00pages
201-7issue
1eissn
0028-3878issn
1526-632Xjournal_volume
53pub_type
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