 I'm Brie Wood along with Trey Thomas on your home for 24-7 news, the Black Information Network. Your Healthy Minute is up next. Ancient viruses in human DNA may increase the risk of depression, schizophrenia, and bipolar disorder, according to a new study. Researchers at King's College London found that people with higher genetic risk of these conditions showed unusual activity levels of viral genes known as endogenous retrovirus in their DNA.