Journal
JOURNAL OF NEUROSCIENCE
Volume 25, Issue 10, Pages 2586-2590Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.3769-04.2005
Keywords
serotonin; 5-HT1A receptor; serotonin transporter; genetics; polymorphisms; positron emission tomography
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Funding
- NIDA NIH HHS [K08 DA014276-01A2, K08 DA014276-05, K08 DA014276-03, K08 DA014276, K08 DA014276-04, K08 DA014276-02] Funding Source: Medline
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In humans, 5-HT1A receptors are implicated in anxiety and depressive disorders and their treatment. However, the physiological and genetic factors controlling 5-HT1A receptor expression are undetermined in health and disease. In this study, the influence of two genetic factors on 5-HT1A receptor expression in the living human brain was assessed using the 5-HT1A-selective positron emission tomography (PET) ligand [C-11] WAY 100635. After the genotyping of 140 healthy volunteers to study population frequencies of known single nucleotide polymorphisms (SNPs) in the 5-HT1A receptor gene, the influence of the common SNP [(-1018) C > G] on 5-HT1A receptor expression was examined in a group of 35 healthy individuals scanned with [11C] WAY 100635. In the PET group, we also studied the influence of a common variable number tandem repeat polymorphism [short (S) and long (L) alleles] of the 5-HT transporter (5-HTT) gene on 5-HT1A receptor density. Whereas, the 5-HT1A receptor genotype did not show any significant effects on [11C] WAY 100635 binding, 5-HT1A receptor binding potential values were lower in all brain regions in subjects with 5-HTTLPR short (SS or SL) genotypes than those with long (LL) genotypes. Although the PET groups are necessarily a small sample size for a genetic association study, our results demonstrate for the first time that a functional polymorphism in the 5-HTT gene, but not the 5-HT1A receptor gene, affects 5-HT1A receptor availability in man. The results may offer a plausible physiological mechanism underlying the association between 5-HTTLPR genotype, behavioral traits, and mood states.
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