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[Dopamine system genes and personality traits of extraversion and novelty seeking]

Zh Vyssh Nerv Deiat Im I P Pavlova, Vol. 56, No. 4. (g 2006), pp. 457-463.


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Dopamine neurotransmissin is thought to play a relevant role in behavioral reinforcement system. Polymorphism of the genes involved in dopamine system has been reported for association with psychological traits related to impulsive and sensation seeking behaviors. The study was aimed at a search for association of catechol-O-metyltransferase (COMT) and dopamine receptor D4 (DRD4) gene polymorphism with personality traits in Russian population. A sample comprised 130 subjects. It was found that carriers of the Met/Met COMT genotype had higher scores of novelty seeking as compared to those with the Val/Val and Met/Met genotypes. The association was observed in women only. In the presence of the C allele of the DRD4 gene, females with the Met/Met genotype demonstrated higher scores on extraversion and hypomania. The results are consistent with the current theoretical concepts on the regulation of dopamine neurotransmission in the brain.


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