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. 2020 Jul;25(7):1430-1446.
doi: 10.1038/s41380-019-0546-6. Epub 2020 Jan 23.

Genome-wide gene-environment analyses of major depressive disorder and reported lifetime traumatic experiences in UK Biobank

Collaborators, Affiliations

Genome-wide gene-environment analyses of major depressive disorder and reported lifetime traumatic experiences in UK Biobank

Jonathan R I Coleman et al. Mol Psychiatry. 2020 Jul.

Erratum in

Abstract

Depression is more frequent among individuals exposed to traumatic events. Both trauma exposure and depression are heritable. However, the relationship between these traits, including the role of genetic risk factors, is complex and poorly understood. When modelling trauma exposure as an environmental influence on depression, both gene-environment correlations and gene-environment interactions have been observed. The UK Biobank concurrently assessed Major Depressive Disorder (MDD) and self-reported lifetime exposure to traumatic events in 126,522 genotyped individuals of European ancestry. We contrasted genetic influences on MDD stratified by reported trauma exposure (final sample size range: 24,094-92,957). The SNP-based heritability of MDD with reported trauma exposure (24%) was greater than MDD without reported trauma exposure (12%). Simulations showed that this is not confounded by the strong, positive genetic correlation observed between MDD and reported trauma exposure. We also observed that the genetic correlation between MDD and waist circumference was only significant in individuals reporting trauma exposure (rg = 0.24, p = 1.8 × 10-7 versus rg = -0.05, p = 0.39 in individuals not reporting trauma exposure, difference p = 2.3 × 10-4). Our results suggest that the genetic contribution to MDD is greater when reported trauma is present, and that a complex relationship exists between reported trauma exposure, body composition, and MDD.

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Conflict of interest statement

Conflict of Interest

No authors report a conflict of interest associated with the research presented in this paper.

Figures

Figure 1:
Figure 1:
Genetic correlations between MDD (overall and stratified by reported trauma exposure) and selected traits and disorders. Full genetic correlation results are available in Supplementary Table 9. Numbers = genetic correlations. Colour = direction of effect (blue = positive, red = negative). Colour intensity = size of correlation. Upper and lower bars are 95% confidence interval of genetic correlation.
Figure 2:
Figure 2:
Association between MDD polygenic risk score (PRS) and MDD. Individuals reporting trauma exposure are shown as orange triangles, and those not reporting trauma exposure as green dots. Panel a shows the relationship on the linear additive scale, and panel b shows the relationship on the multiplicative scale. A significant interaction is observed on the additive scale only, as shown by differing slopes of the two regression lines in panel a.

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