| Abstract |
Genome-wide association studies (GWASs) have identified a number of susceptibility genes forschizophrenia(SCZ) and bipolar disorder (BD). However, the identification of risk genes for major depressive disorder (MDD) has been unsuccessful because the etiology of MDD is more influenced by environmental factors; thus, gene-environment (G � E) interactions are important, such as interplay with stressful life events (SLEs). We assessed the G�E interactions and main effects of genes targeting depressive symptoms. Using a case-control design, 922 hospital staff members were evaluated for depressive symptoms according to Beck Depressive Inventory (BDI; "depression" and "control" groups were classified by scores of 10 in the BDI test), SLEs, and personality. A total of sixty-three genetic variants were selected on the basis of previous GWASs of MDD, SCZ, and BD as well as candidate-gene (SLC6A4, BDNF, DBH, and FKBP5) studies. Logistic regression analysis revealed a marginally significant interaction (genetic variant � SLE) at rs4523957 (P uncorrected = 0.0034) with depression and a significant association of single nucleotide polymorphism identified from evidence of BD GWAS (rs7296288, downstream ofDHH与着12 q13.1)sion as the main effect (P uncorrected = 9.4 � 10(-4), P corrected = 0.0424). We also found that SLEs had a larger impact on depression (odds ratio ? 3), as reported previously. These results suggest thatDHHplays a possible role in depression etiology; however, variants from MDD or SCZ GWAS evidence or candidate genes showed no significant associations or minimal effects of interactions with SLEs on depression. |