== ANOVA and 2test were used to compare demographics, distribution of the other genetic polymorphisms withinDRD2rs1076560 organizations, and behavioral actions. Five Questionnaire scores were evaluated in 134 healthy subjects demonstrating that GG subjects have reduced feelings control compared with GT subjects. Functional magnetic resonance imaging in a sample of 24 individuals indicated higher amygdala activity during implicit processing and higher dorsolateral prefrontal cortex (DLPFC) response during explicit processing of facial emotional stimuli in GG subjects compared with GT. Other results also demonstrate an connection betweenDRD2genotype and facial emotional expression on practical connectivity of both amygdala and dorsolateral prefrontal areas with overlapping medial prefrontal areas. Moreover, rs1076560 genotype is definitely associated with differential human relationships between amygdala/DLPFC practical connectivity and feelings control scores. These results suggest that genetically identified D2signaling may clarify part of personality traits related to feelings processing and individual variability in specific SS28 brain reactions to emotionally relevant inputs. == Intro == Dopamine signaling is definitely involved in feelings processing and control of emotional behavior (LeDoux, 1998;Salgado-Pineda et al., 2005). For example, dopaminergic psychostimulants impact emotional behavior (Hall et al., 1988). Consistently, during conditioned fear paradigms in animals, dopamine modulates activity in amygdala and in prefrontal cortex (Rosenkranz and Elegance, 2001;Pezze and Feldon, 2004), key mind regions for feelings understanding and control (Dolan, 2002;Ochsner and Gross, 2005). Moreover, genetic variance in cathecol-O-methyltransferase (COMT) (Val158Met), critically involved in dopamine catabolism, affects emotional behavior, related mind activity, and their relationship in both animals and humans (Gogos et al., 1998;Woo et al., 2002;Enoch et al., 2003;Smolka et al., 2005;Stein et al., 2005;Drabant et al., 2006). Dopamine D2receptors have been implicated in feelings processing (Pezze and SS28 Feldon, 2004). Administration of D2agonists or antagonists in animal models modulates emotional reactions, including emotional reactivity (Gendreau et al., 1998) and learning (Greba et al., 2001). However, little is known about possible associations between the D2gene (DRD2) with emotional behavior (Drew et al., 2007). D2receptors exist in two on the other hand spliced isoforms, the D2long (D2L) located primarily postsynaptically and D2short (D2S) functioning as presynaptic autoreceptor (Usiello et al., 2000). Studies in mice have suggested involvement of the D2L isoform in emotional responses. In particular, D2L-deficient mice have reduced explorative behavior and improved latency to escape from harmful situations (Hranilovic et al., 2008), suggesting that they are more anxious. Manifestation of D2isoforms is definitely associated with a known genetic variant. Recently, we have characterized a novel practical solitary nucleotide polymorphism (SNP) within theDRD2gene at intron 6, rs1076560 (G T substitution). GG SS28 genotype is definitely associated with relatively greater manifestation of D2S mRNA in prefrontal cortex and in striatum as well as with more efficient cognitive processing relative to GT genotype (Zhang et al., 2007). Different models of human being personality have been proposed KMT2C identifying several qualities or sizes. Regardless of the model, personality traits are in SS28 part heritable (Jang et al., 1998), especially in terms of feelings control and stability (Jang et al., 1996;Lesch, 2005). In the present study in healthy humans, we investigated the association ofDRD2rs1076560 genotype with personality traits as measured with the Big Five Questionnaire (BFQ) (Caprara et al., 2003). Given the known relationship between dopamine signaling and control of emotional behavior, we hypothesized specific effects ofDRD2rs1076560 variants on the emotional stability dimension of the BFQ. Moreover, we explored with practical magnetic resonance imaging (fMRI) the potential association ofDRD2rs1076560 genotype with physiologic mind responses during emotional perceptual processing and explicit emotional evaluation. These emotional processes prominently participate the amygdala and the prefrontal cortex, respectively (Gusnard et al., 2001;Phillips et al., 2003;Ochsner et al., 2004a,b). Based on data in animal models (Hranilovic et al., 2008) and on earlier knowledge of dopamine projections and D2receptor distribution, we hypothesized differential activity and practical connectivity of these brain areas during feelings processing based on theDRD2rs1076560 polymorphism. == Materials and Methods == == == == == == Subjects. == One hundred thirty-four healthy subjects (84 females; imply SD, 26.4 6.7 years) participated. Inclusion criteria were absence of any psychiatric disorder, as evaluated with the Organized Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders IV, of any significant neurological or medical condition exposed by medical and magnetic resonance imaging evaluation, of history of head stress with loss of consciousness, and.