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Jovanova, O.S.* ; Nedeljkovic, I.* ; Spieler, D. ; Walker, R.M.* ; Liu, C.* ; Luciano, M.* ; Bressler, J.* ; Brody, J.* ; Drake, A.J.* ; Evans, K.L.* ; Gondalia, R.* ; Kunze, S. ; Kühnel, B. ; Lahti, J.* ; Lemaitre, R.N.* ; Marioni, R.E.* ; Swenson, B.R.* ; Himali, J.J.* ; Wu, H.* ; Li, Y.* ; McRae, A.F.* ; Russ, T.C.* ; Stewart, J.* ; Wang, Z.* ; Zhang, G.* ; Ladwig, K.-H. ; Uitterlinden, A.G.* ; Guo, X.* ; Peters, A. ; Räikkönen, K.* ; Starr, J.M.* ; Waldenberger, M. ; Wray, N.R.* ; Whitsel, E.A.* ; Sotoodehnia, N.* ; Seshadri, S* ; Porteous, D.J.* ; van Meurs, J.B.* ; Mosley, T.H.* ; McIntosh, A.M.* ; Mendelson, M.M.* ; Levy, D.* ; Hou, L.* ; Eriksson, J.G.* ; Fornage, M.* ; Deary, I.J.* ; Baccarelli, A.* ; Tiemeier, H.* ; Amin, N.*

DNA methylation signatures of depressive symptoms in middle-aged and elderly persons meta-analysis of multiethnic epigenome-wide studies.

JAMA psychiatry 75, 949-959 (2018)

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IMPORTANCE Depressive disorders arise from a combination of genetic and environmental risk factors. Epigenetic disruption provides a plausible mechanism through which gene-environment interactions lead to depression. Large-scale, epigenome-wide studies on depression are missing, hampering the identification of potentially modifiable biomarkers.OBJECTIVE To identify epigenetic mechanisms underlying depression in middle-aged and elderly persons, using DNA methylation in blood.DESIGN, SETTING, AND PARTICIPANTS To date, the first cross-ethnic meta-analysis of epigenome-wide association studies (EWAS) within the framework of the Cohorts for Heart and Aging Research in Genomic Epidemiology (CHARGE) Consortium was conducted. The discovery EWAS included 7948 individuals of European origin from 9 population-based cohorts. Participants who were assessed for both depressive symptoms and whole-blood DNA methylation were included in the study. Results of EWAS were pooled using sample-size weighted meta-analysis. Replication of the top epigenetic sites was performed in 3308 individuals of African American and European origin from 2 population-based cohorts.MAIN OUTCOMES AND MEASURES Whole-blood DNA methylation levels were assayed with Illumina-Infinium Human Methylation 450K BeadChip and depressive symptoms were assessed by questionnaire.RESULTS The discovery cohorts consisted of 7948 individuals (4104 [51.6%] women) with a mean (SD) age of 65.4 (5.8) years. The replication cohort consisted of 3308 individuals (2456 [74.2%) women) with a mean (SD) age of 60.3 (6.4) years. The EWAS identified methylation of 3 CpG sites to be significantly associated with increased depressive symptoms: cg04987734 (P = 1.57 x 10(-)(08); n = 11 256; CDC42BPB gene), cg12325605 (P = 5.24 x 10(-09); n = 11256; ARHGEF3 gene), and an intergenic CpG site cg14023999 (P = 5.99 x 10(-)(08); n = 11256; chromosome = 15q261). The predicted expression of the CDC42BPB gene in the brain (basal ganglia) (effect, 0.14; P = 2.7 x 10(-03)) and of ARHGEF3 in fibroblasts (effect. -0.48; P = 9.8 x 10(-)(04) ) was associated with major depression.CONCLUSIONS AND RELEVANCE This study identifies 3 methylated sites associated with depressive symptoms. All 3 findings point toward axon guidance as the common disrupted pathway in depression. The findings provide new insights into the molecular mechanisms underlying the complex pathophysiology of depression. Further research is warranted to determine the utility of these findings as biomarkers of depression and evaluate any potential role in the pathophysiology of depression and their downstream clinical effects. (C) 2018 American Medical Association. All lights reserved.

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