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  • Title: Prediction of level of serotonin 2A receptor binding by serotonin receptor 2A genetic variation in postmortem brain samples from subjects who did or did not commit suicide.
    Author: Turecki G, Brière R, Dewar K, Antonetti T, Lesage AD, Séguin M, Chawky N, Vanier C, Alda M, Joober R, Benkelfat C, Rouleau GA.
    Journal: Am J Psychiatry; 1999 Sep; 156(9):1456-8. PubMed ID: 10484964.
    Abstract:
    OBJECTIVE: Postmortem studies have indicated that suicide victims have greater serotonin receptor 2A (5-HTR2A) binding in prefrontal brain regions. However, there remains some controversy regarding the biological specificity of these findings. The authors hypothesized that the variance observed in brain 5-HTR2A binding is genetically mediated, at least in part. METHOD: Postmortem data from 56 subjects who had committed suicide and 126 normal comparison subjects were studied; brain tissue was available from 11 subjects who committed suicide and 11 comparison subjects. Homogenate binding assays were carried out with [3H]ketanserin. Variation at the 5-HTR2A gene (HTR2A) was investigated by means of two polymorphisms: T102C and A-1438G. RESULTS: 5-HTR2A binding was greater in the prefrontal cortex of the subjects who committed suicide. In addition, the findings suggest that HTR2A variation significantly affects 5-HTR2A binding. However, no interaction between suicidal behavior and this locus was observed. CONCLUSIONS: These results confirm previous reports of greater 5-HTR2A binding in subjects who committed suicide; they also provide preliminary evidence suggesting that the number of 5-HTR2A receptors is genetically mediated.
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