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Arch Neurol. 2002 Jul;59(7):1154-60.

The apolipoprotein E epsilon 4 allele and decline in different cognitive systems during a 6-year period.

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  • 1Rush Alzheimer's Disease Center and Rush Institute for Healthy Aging, 1645 W Jackson Blvd, Suite 675, Chicago, IL 60612, USA. rwilson@rush.edu

Abstract

CONTEXT:

Impairment of episodic memory is an early and defining feature of Alzheimer disease (AD). The apolipoprotein E (APOE) epsilon 4 allele is known to influence risk of AD but it has been difficult to establish whether it affects episodic memory differently from other cognitive functions.

OBJECTIVE:

To examine the association of epsilon 4 with decline in different cognitive systems.

DESIGN:

Longitudinal cohort study.

SETTING:

More than 40 groups of Catholic clergy from across the United States.

PARTICIPANTS:

Older Catholic clergy members without clinical evidence of dementia at baseline underwent annual clinical evaluations for up to 6 years. Of 624 persons eligible for follow-up, 611 (98%) participated, of whom 161 (26%) had at least 1 epsilon 4 allele. They completed an average of 5.5 evaluations (range, 2-7).

MAIN OUTCOME MEASURES:

Incident AD and annual rates of change in episodic memory, semantic memory, working memory, perceptual speed, and visuospatial ability.

RESULTS:

The presence of epsilon 4 was associated with risk of developing AD on follow-up (relative risk, 1.92; 95% confidence interval, 1.27-2.89). In a series of random effects models, epsilon 4 was associated with impaired baseline function in episodic memory and visuospatial ability and with more rapid decline in all domains. The effect of epsilon 4 on annual decline in episodic memory (>3-fold increase) was significantly stronger than its effect on decline in other cognitive systems (P<.01), and at baseline, its effect on episodic memory was marginally stronger than its effect on other cognitive domains (P =.06).

CONCLUSION:

The results suggest that the APOE epsilon 4 allele influences risk of AD by a relatively selective effect on episodic memory.

PMID:
12117364
[PubMed - indexed for MEDLINE]
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