Jul 26, 2016

Genetic heterogeneity in depressive symptoms following the death of a spouse: Polygenic score analysis of the US Health and Retirement Study

BioRxiv : the Preprint Server for Biology
Ben W DomingueAysu Okbay

Abstract

Experience of stressful life events is associated with risk of depression. Yet many exposed individuals do not become depressed. A controversial hypothesis is that genetic factors influence vulnerability to depression following stress. This hypothesis is most commonly tested with a 'diathesis-stress' model, in which genes confer excess vulnerability. We tested an alternative model, in which genetics may buffer against the depressogenic effects of life stress. We measured the hypothesized genetic buffer using a polygenic score derived from a genome-wide association study of subjective wellbeing. We tested if older married adults who had higher polygenic scores were less subject to depressive symptoms following the death of their spouse as compared to peers who had also lost their spouse and who had lower polygenic scores. We analyzed data from N=9,453 non-Hispanic white adults in the Health and Retirement Study (HRS), a population-representative longitudinal study of older adults in the United States. HRS adults with higher wellbeing polygenic scores experienced fewer depressive symptoms during follow-up. Those who lost their spouses (n=1,829) during follow-up experienced a sharp increase in depressive symptoms following the dea...Continue Reading

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Mentioned in this Paper

Buffers
Genome-Wide Association Study
Study
Biochemical Pathway
Hispanics
Follow-up
Genes
Longitudinal Studies
Depressed - Symptom
Peer

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