Finno-Ugrian suicide hypothesis
The Finno-Ugrian suicide hypothesis proposes to link genetic ties originating among Finno-Ugric peoples to high rate of suicide, claiming an allele common among them is responsible. Mari and Udmurts have been found to have a three times higher suicide rate than Finns and Hungarians.
Source: Wikipedia — Finno-Ugrian suicide hypothesis (CC BY-SA 4.0)