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Polygenic risk, stressful life events and depressive symptoms in older adults: a polygenic score analysis

Published online by Cambridge University Press:  09 December 2014

K. L. Musliner ,
F. Seifuddin ,
J. A. Judy ,
M. Pirooznia ,
F. S. Goes  and
P. P. Zandi
K. L. Musliner*
Affiliation:
Department of Mental Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
F. Seifuddin
Affiliation:
Department of Psychiatry and Behavioral Sciences, Johns Hopkins Institute of Medicine, Baltimore, MD, USA
J. A. Judy
Affiliation:
Department of Psychiatry and Behavioral Sciences, Johns Hopkins Institute of Medicine, Baltimore, MD, USA
M. Pirooznia
Affiliation:
Department of Psychiatry and Behavioral Sciences, Johns Hopkins Institute of Medicine, Baltimore, MD, USA
F. S. Goes
Affiliation:
Department of Psychiatry and Behavioral Sciences, Johns Hopkins Institute of Medicine, Baltimore, MD, USA
P. P. Zandi
Affiliation:
Department of Mental Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
*
*Address for correspondence: K. L. Musliner, M.P.H., Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, 624 N Broadway, Baltimore, MD 21205, USA. (Email: kmuslin1@jhu.com)
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Abstract

Background.

Previous studies suggest that the relationship between genetic risk and depression may be moderated by stressful life events (SLEs). The goal of this study was to assess whether SLEs moderate the association between polygenic risk of major depressive disorder (MDD) and depressive symptoms in older adults.

Method.

We used logistic and negative binomial regressions to assess the associations between polygenic risk, SLEs and depressive symptoms in a sample of 8761 participants from the Health and Retirement Study. Polygenic scores were derived from the Psychiatric Genomics Consortium genome-wide association study of MDD. SLEs were operationalized as a dichotomous variable indicating whether participants had experienced at least one stressful event during the previous 2 years. Depressive symptoms were measured using an eight-item Center for Epidemiologic Studies Depression Scale subscale and operationalized as both a dichotomous and a count variable.

Results.

The odds of reporting four or more depressive symptoms were over twice as high among individuals who experienced at least one SLE (odds ratio 2.19, 95% confidence interval 1.86–2.58). Polygenic scores were significantly associated with depressive symptoms (β = 0.21, p ⩽ 0.0001), although the variance explained was modest (pseudo r2 = 0.0095). None of the interaction terms for polygenic scores and SLEs was statistically significant.

Conclusions.

Polygenic risk and SLEs are robust, independent predictors of depressive symptoms in older adults. Consistent with an additive model, we found no evidence that SLEs moderated the association between common variant polygenic risk and depressive symptoms.

Keywords

Depressiongeneticspolygenic score analysisstress
Type
Original Articles
Information
Psychological Medicine , Volume 45 , Issue 8 , June 2015 , pp. 1709 - 1720
Copyright
Copyright © Cambridge University Press 2014 

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