Scottish researchers find 100 genes linked to depression An international study led by the University of Edinburgh has discovered more than 100 genes linked to depression.
Experts studied data from two million people in 20 countries.
They found genetic variations affected nerve connections in the parts of the brain controlling decision-making and personality.
The more gene variations their subjects had, the more likely they were to be depressed.
Researchers believe their discovery could lead to better treatments. BBC News