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Although the apolipoprotein E (APOE) ϵ4 allele is a major genetic risk factor for late-onset Alzheimer disease, its effect on hippocampal function during episodic memory is controversial because studies have yielded mixed results. The age of the studied cohorts may contribute to this apparent inconsistency: activation for ϵ4 carriers tends to be increased in studies of older adults but decreased in some studies of younger adults. Consistent with differential age effects, research in transgenic mice suggests that the ϵ4 allele may particularly affect the aging process.

Interactive Effect of Apolipoprotein E Genotype and Age on Hippocampal Activation During Memory Processing in Healthy Adults