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Simultaneous analysis of serotonin transporter, tryptophan hydroxylase 1 and 2 gene expression in the ventral prefrontal cortex of suicide victims

Neidhart, Elizabeth
Petit, Brice
Vessaz, Monique
Laforge, Terese
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Published in American Journal of Medical Genetics. B. 2010, vol. 153B, no. 4, p. 909-918
Abstract Serotonergic signaling abnormalities have been implicated in suicide. Tryptophan hydroxylase (TPH), the rate limiting enzyme of serotonin biosynthesis and the serotonin transporter (SLC6A4), involved in the reuptake of serotonin from the synaptic gap, play major role in serotonergic signaling. In this study, we aimed to compare the levels of expression of these serotonin-related genes between suicide completers and controls and to identify genetic loci involved in their regulation. SLC6A4, TPH1, and TPH2 mRNA levels were measured in the ventral prefrontal cortex (VPFC) of 39 suicide completers and 40 matched controls. To identify the molecular basis of gene expression variation, we performed association studies between cis-acting polymorphisms and SLC6A4, TPH1, and TPH2 transcript levels. Finally, association analyses were carried out between suicide and TPH2 cis-single nucleotide polymorphisms (SNPs) in cohorts of 154 suicide completers and 289 control subjects. Whereas SLC6A4 and TPH1 mRNA expression levels did not differ between suicides and controls, TPH2 levels were found significantly increased (P = 0.003) in suicide completers. We observed that SNP rs10748185 located in the promoter region of TPH2 significantly affect levels of TPH2 mRNA expression. However, we did not find positive association between this eQTL (rs10748185) and suicide. Here, we report the simultaneous analysis of the expression of three serotonin-related genes in the VPFC of suicide victims and controls. This study showed that TPH2 expression levels were increased in the VPFC of suicide victims. Although, we identified a genetic variant that explains variance in TPH2 expression, we did not find evidence associating this cis-regulatory SNP with suicidal behavior.
Keywords AdultCase-Control StudiesFemaleGene Expression/*physiologyGenesGenetic LociHumansMaleMiddle AgedPolymorphism, GeneticPolymorphism, Single NucleotidePrefrontal Cortex/*metabolismRNA, Messenger/genetics/metabolismSelf-Injurious Behavior/geneticsSerotonin/genetics/metabolismSerotonin Plasma Membrane Transport Proteins/genetics/metabolismSuicide/*psychologyTryptophan Hydroxylase/*genetics/*metabolism
PMID: 20052688
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Research groups Génétique psychiatrique (4)
Neurorécepteurs et ARN (672)
(ISO format)
PERROUD, Nader Ali et al. Simultaneous analysis of serotonin transporter, tryptophan hydroxylase 1 and 2 gene expression in the ventral prefrontal cortex of suicide victims. In: American Journal of Medical Genetics. B, 2010, vol. 153B, n° 4, p. 909-918. doi: 10.1002/ajmg.b.31059 https://archive-ouverte.unige.ch/unige:21210

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Deposited on : 2012-05-23

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