Why do some actors get depression?

Modern medicine has proved that depression comes from genes. As early as when our ancestors Homo sapiens and Neanderthals fused genes, Neanderthals passed on the genes that were prone to depression to us. Therefore, as modern people, some of us will suffer from depression. The root of depression is that we have depression genes, which have nothing to do with our occupation. Some actors get depression just because the depression gene is at work.