A gene from Denisovans makes people predisposed to mental health issues The gene was passed down to humans about 60,000 years ago in Asia Humans having sex with a now-extinct subspecies they met in Asia some 60,000 years ago could be the reason you have depression, a new study has claimed. Researchers discovered a gene variant linked to the crossbreeding of humans and Denisovans which they believe affects our mood. Those with the variant have lower levels of zinc in the body - a nutrient which studies increasingly show is associated with mood and happiness. Scientists said SLC30A9 is the...