Dopamine D4 receptor exon III polymorphism, adverse life events and personality traits in a nonclinical German adult sample.
Personality and temperament embrace a wide area of both psychological and behavioral processes which are also based on disposition. A functional polymorphism in exon III of the dopamine D4 receptor gene (DRD4) has been a highly suspect genetic marker for personality in spite of ambiguous results. The present study aimed to further elucidate the relationship between DRD4, negative life events and personality in a representative nonclinical sample. Hundred sixty-seven Germans completed the NEO Five-Factor Inventory, the Tridimensional Personality Questionnaire and the California Adult Q-Sort. A factor analysis revealed 3 factors: emotional stability, social orientation and impulsivity. DNA from buccal cells was genotyped for the DRD4 variable-number tandem-repeat exon III polymorphism with respect to presence versus absence of the DRD4 7-repeat allele. Adverse life events were assessed by means of the Adverse Life Events Scale. Men carrying the DRD4 7-repeat allele were more impulsive than those without. Male 7-repeat carriers were more emotionally instable than others, but only when they experienced a large amount of negative life events. No genotype-personality relationships were found for women. The results indicate gender-specific influences of the DRD4 gene on human behavior and invite researchers to further investigate gene-environment correlations on personality traits.
Clinic for Psychosomatic Medicine and Psychotherapy, Johannes Gutenberg University of Mainz, Mainz, Germany. iris.reiner@unimedizin-mainz.de
Iris
I
Reiner
Gottfried
G
Spangler
D000328:Adult; D000483:Alleles; D005091:Exons / Q000235:genetics*; D005260:Female; D005838:Genotype; D005858:Germany; D006801:Humans; D008016:Life Change Events; D008297:Male; D008875:Middle Aged; D018598:Minisatellite Repeats; D010551:Personality / Q000235:genetics*; D010552:Personality Assessment; D011110:Polymorphism, Genetic; D050638:Receptors, Dopamine D4 / Q000235:genetics*; D012727:Sex Characteristics; D044465:White People / Q000235:genetics*
D050638:Receptors, Dopamine D4