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Suicide, stress and serotonin receptor 1A promoter polymorphism -1019C>G in Slovenian suicide victims
Videtič Paska, Alja, 1980- ...
Implication of serotonergic system in suicide and suicide attempts has been discussed for several years. One of the most abundant serotonin receptors in the mammalian brain is the receptor 1A ...(5-HT1A); studies of its polymorphismsand suicide have provided very inconsistent results so far. The suggestion that the G allele depresses HTR1A autoreceptor expression, and therefore reduces serotonergic neurotransmission that might predispose to depression and suicide, made the promoter polymorphism -1019C>G a very promising candidate gene. In our study we analyzed promoter polymorphism -1019C>G on 323 suicide victims and 190 controls (all of Slovenian origin), taking into account sex, suicide method, and in case of suicide victims also stressful life events. Differences in the distributions of genotype and allelefrequencies were not statistically significant between suicide victims and control group, and the same was found for distributions according to sex and suicide method. For 62 suicide victims information about stressful life events in the month prior to the suicide and in childhood was provided. For analysis we combined CG/GG genotypes and compared them to the CC genotype. More stressful life events in the month prior to the suicide were reported forthe subgroup with CC genotype (mean number of events = 2.53; SD = 1.50) incomparison to subgroup with CG/GG genotypes (mean number of events = 1.58; SD = 1.32; P < 0.05). However, subgroups of suicide victims with CC or CG/GG genotypes did not differ regarding numbers of reported stressful life events in childhood (P > 0.05). Our study provides no evidence for the implication ofHTR1A promoter polymorphism in suicide in general, but it suggests further studies that would take into account the interconnected network of suicide completion, genetic background and stress, beside other risk factors.
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