Nature Genetics
12, 78 - 80 (1996)
doi:10.1038/ng0196-78
Dopamine D4 receptor (D4DR) exon III polymorphism associated with the human personality trait of Novelty SeekingRichard P. Ebstein1, 3, 4, Olga Novick2, Roberto Umansky2, Beatrice Priel2, Yamima Osher2, Darren Blaine1, Estelle R. Bennett1, Lubov Nemanov1, Miri Katz1
& Robert H. Belmaker2
1Research Laboratory, S. Herzog Memorial Hospital, P.O.Box 35300, Jerusalem 91351, Israel.
2Beersheva Mental Health Center, Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O.Box 4600, Beersheva, Israel.
3Laboratory Director, S. Herzog Memorial Hospital, P.O.Box 35300, Jerusalem 91351, Israel.
4Correspondence should be addressed to R.P.E. Human personality traits which can be reliably measured by any of a number of rating scales, show a considerable heritable component1,2. The tridimensional personality questionnaire (TPQ) is one such instrument and was designed by Cloninger to measure four distinct domains of temperament — Novelty Seeking, Harm Avoidance, Reward Dependence and Persistence — that are hypothesized to be based on distinct neurochemical and genetic substrates. Cloninger proposed that individual variations in the Novelty Seeking trait are mediated by genetic variability in dopamine transmission2. Individuals who score higher than average on the TPQ Novelty Seeking scale are characterized as impulsive, exploratory, fickle, excitable, quick-tempered and extravagant, whereas those who score lower than average tend to be reflective, rigid, loyal, stoic, slow-tempered and frugal. We now show that higher than average Novelty Seeking test scores in a group of 124 unrelated Israeli subjects are significantly associated with a particular exonic polymorphism, the 7 repeat allele in the locus for the D4 dopamine receptor gene (D4DR). The association of high Novelty Seeking and the 7-repeat allele was independent of ethnicity, sex or age of the subjects. This work, together with the accompanying confirmations in this issue3, provides the first replicated association between a specific genetic locus involved in neuro-transmission and a normal personality trait.
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