Researchers have pinpointed how one particular gene plays a central role—either protecting from stress or triggering a downward spiral, depending on its level of activity. Globally, depression affects more than 300 million people annually. Nearly 800,000 die from suicide every year.

See the source article by following the link below:
Researchers have pinpointed how one particular gene plays a central role—either protecting from stress or triggering a downward spiral, depending on its level of activity. Globally, depression affects more than 300 million people annually. Nearly 800,000 die from suicide every year.