Is there a Suicide Gene? Or 10 or more of them?

Excerpt:

The finding adds support to a 2,000-year-old belief, dating back to Biblical times, that mental illness and self-destructiveness run in families. Epidemiological studies also back up this idea. For example, two countries that top the world's suicide rate list are Hungary and Finland, with 40 suicides per 100,000 people. Although the countries lie 1,600 kilometers apart, their people share a language group and, presumably, genes. The Finno-Ugric people lived together for thousands of years in the Ural Mountains of what is now Russia, then migrated to Finland and Hungary.

The medical literature has documented many genetic links to suicide. One such study, published in the American Journal of Medical Genetics in 1985 examined the rate of suicide among the Amish population in southern Pennsylvania. Genealogical and medical records revealed that four families accounted for 73 percent of all suicides, but represented only 16 percent of the total Amish population. 

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A Suicide Gene