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Genetics of suicide

Molecular Psychiatry volume 11, pages 336–351 (2006)Cite this article

Abstract

The concept that genetic factors contribute to the complex trait of suicidal behaviour has stimulated much work aimed at identifying susceptibility genes. So far molecular genetic studies focused on the serotonergic pathway as the intent to die and the lethality of suicide acts were related to the serotonergic system. Two genes have so far emerged as being involved in the vulnerability for suicidality: first, the intronic polymorphisms (A218C or A779C) of the tryptophan hydroxylase 1 (TPH1) gene, which was suggested as a quantitative risk factor for suicidal behaviour; second, the insertion/deletion polymorphism of the serotonin transporter gene (5-HTTLPR), which does not seem to be involved in general suicidal behaviour, but in violent and repeated suicide attempts. The data have further shown that the MAOA gene, which is consistently associated with impulsive-aggressive personality traits, is not related to suicide but might induce violent methods in subjects with other suicide risk factors. Predominantly negative were the findings with any type of the serotonin receptors and inconsistent with catecholamine-synthesizing and -metabolizing enzymes or with the dopaminergic receptors. This paper reviews the status of current knowledge in this area, points to the weakness of the investigations and presents new approaches beyond the serotonergic system.

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Acknowledgements

A part of the work cited here was supported by the German Federal Research Ministry within the promotional emphasis Competence Nets in Medicine.

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  1. Section Psychiatric Genetics and Neurochemistry, Psychiatric Clinic, Ludwig-Maximilians-University, Munich, Germany

    B Bondy & P Zill

  2. Institute for Legal Medicine, Ludwig-Maximilians-University, Munich, Germany

    A Buettner

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Bondy, B., Buettner, A. & Zill, P. Genetics of suicide. Mol Psychiatry 11, 336–351 (2006). https://doi.org/10.1038/sj.mp.4001803

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