[The genetics of suicidal behavior].

There is consistent evidence suggesting that genetic factors play an important role in predisposition to suicidal behavior. Family, twin, and adoption studies have demonstrated that there is a genetic dimension to suicide. Although there is some overlap between suicide and mood disorders, even among psychiatric groups with the highest risk, some patients never attempt suicide, indicating the importance of a diathesis or genetic link to suicide that is independent of the underlying psychiatric disorder. Over the last 3 decades research has shown that there is a relationship between suicide, aggressiveness, and impulsivity. It is possible that genetic factors may be related to personality traits such as impulsiveness and aggressiveness, which in turn may lead to suicide attempts. An increasing number of molecular genetic studies have been carried out among cases involving suicidal behavior and candidate genes thought to be related to suicide. The most important candidate genes include the serotonin transporters (SERTs), tryptophan hydroxylase (TPH), some serotonin receptors (5HT1A, 5HT1B, and 5HT2A), catechol-O-methyltransferase (COMT), monoamine oxidase-A (MAO-A), and tyrosine hydroxylase (TH). The aim of this review was to assess the genetic dimension of suicide behavior, both current and historical.