Psychological Medicine



Apolipoprotein E genotype and major depression in a community of older adults. The Cache County Study 1


D. C. STEFFENS a1c1, M. C. NORTON a1, A. D. HART a1, I. SKOOG a1, C. CORCORAN a1 and J. C. S. BREITNER a1 2
a1 From the Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, College of Family Life, Department of Psychology and Department of Mathematics and Statistics, Utah State University, UT and Geriatric Research Education and Clinical Center, Seattle Veterans Affairs Medical Center, Seattle, WA, USA; and Institute of Clinical Neurosciences, Section of Psychiatry, Gothenberg University, Sweden

Abstract

Background. The role of allelic variation in APOE, the genetic locus for apolipoprotein E, in geriatric depression is poorly understood. There are conflicting reports as to an association between the [varepsilon]4 allele and depression in late life.

Method. Using a community based study of non-demented elders in Cache County, Utah, that included many very old individuals, we examined the relationship between APOE and late-onset (age >60) depression, with particular attention to possible age effects.

Results. There was no overall association between APOE and depression. However, there was a significant interaction effect of APOE and age such that the relationship of late-onset depression with respect to presence of the [varepsilon]4 allele was larger among those 80 and older compared with those below age 80. Consistent with previous studies, women were more likely to experience late-onset depression than men.

Conclusions. Because we excluded prevalent cases of dementia, this pattern of relative risk with age may reflect the appearance of depressive symptoms as a prodrome of Alzheimer's disease or vascular dementia. Longitudinal studies should help to confirm or refute this explanation of the data.


Correspondence:
c1 Dr David C. Steffens, Duke University Medical Center, Box 3903, Durham, NC 27710, USA.


Footnotes

1 Other Cache County Study investigators who contributed to this project are listed on page 546.

2 FOR THE CACHE COUNTY STUDY GROUP



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