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Examining Impulsivity As an Endophenotype Using a Behavioral Approach: a DRD2 Taqi a and DRD4 48-Bp VNTR Association Study

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Examining Impulsivity As an Endophenotype Using a Behavioral Approach: a DRD2 Taqi a and DRD4 48-Bp VNTR Association Study Binghamton University The Open Repository @ Binghamton (The ORB) Anthropology Faculty Scholarship Anthropology 2007 Examining impulsivity as an endophenotype using a behavioral approach: a DRD2 TaqI A and DRD4 48-bp VNTR association study Dan T.A. Eisenberg University of Washington James MacKillop McMaster University Meera Modi Joshua Beauchemin David Dang See next page for additional authors Follow this and additional works at: https://orb.binghamton.edu/anthropology_fac Part of the Biological and Physical Anthropology Commons Recommended Citation Eisenberg, D. T., MacKillop, J., Modi, M., Beauchemin, J., Dang, D., Lisman, S. A., … Wilson, D. S. (2007). Examining impulsivity as an endophenotype using a behavioral approach: a DRD2 TaqI A and DRD4 48-bp VNTR association study. Behavioral and Brain Functions, 3, 2. http://doi.org/10.1186/1744-9081-3-2 This Article is brought to you for free and open access by the Anthropology at The Open Repository @ Binghamton (The ORB). It has been accepted for inclusion in Anthropology Faculty Scholarship by an authorized administrator of The Open Repository @ Binghamton (The ORB). For more information, please contact [email protected]. Authors Dan T.A. Eisenberg, James MacKillop, Meera Modi, Joshua Beauchemin, David Dang, Stephen A. Lisman, J. Koji Lum, and David S. Wilson This article is available at The Open Repository @ Binghamton (The ORB): https://orb.binghamton.edu/ anthropology_fac/11 Behavioral and Brain Functions BioMed Central Research Open Access Examining impulsivity as an endophenotype using a behavioral approach: a DRD2 TaqI A and DRD4 48-bp VNTR association study Dan TA Eisenberg*†1,2,4, James MacKillop†3,5, Meera Modi1, Joshua Beauchemin4, David Dang4, Stephen A Lisman3, J Koji Lum1,2,4 and David S Wilson1,2 Address: 1State University of New York at Binghamton, Biology Department, Binghamton, NY, USA, 2State University of New York at Binghamton, Anthropology Department, Binghamton, NY, USA, 3State University of New York at Binghamton, Psychology Department, Binghamton, NY, USA, 4State University of New York at Binghamton, Laboratory of Evolutionary Anthropology and Health, Binghamton, NY, USA and 5Center for Alcohol and Addiction Studies, Brown University, Providence, RI, USA Email: Dan TA Eisenberg* - [email protected]; James MacKillop - [email protected]; Meera Modi - [email protected]; Joshua Beauchemin - [email protected]; David Dang - [email protected]; Stephen A Lisman - [email protected]; J Koji Lum - [email protected]; David S Wilson - [email protected] * Corresponding author †Equal contributors Published: 10 January 2007 Received: 02 October 2006 Accepted: 10 January 2007 Behavioral and Brain Functions 2007, 3:2 doi:10.1186/1744-9081-3-2 This article is available from: http://www.behavioralandbrainfunctions.com/content/3/1/2 © 2007 Eisenberg et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Background: Research on the genetic basis for impulsivity has revealed an array of ambiguous findings. This may be a result of limitations to self-report assessments of impulsivity. Behavioral measures that assess more narrowly defined aspects of impulsivity may clarify genetic influences. This study examined the relationship between possession of the DRD2 TaqI A and DRD4 48 bp VNTR genetic polymorphisms and performance on a behavioral measure of impulsivity, the delay discounting task (DDT), and three traditional self-report measures. Methods: 195 individuals (42% male) were recruited from a university campus and were assessed in small group sessions using personal computers. Genotyping was conducted using previously established protocols. For the DRD2 TaqI A locus, individuals were designated as possessing at least one copy of the A1 allele (A1+) or not (A1- ), and for the DRD4 48-bp VNTR locus, individuals were designated as having at least one long allele (7 repeats or longer, L+) or not (L-). Principal analyses used multiple univariate factorial 2 (A1+/A1-) × 2 (L+/L-) analyses of variance. Results: A significant main effect of A1+ status on DDT performance was evident (p = .006) as well as a significant interaction effect (p = .006) between both genes. No other significant effects were evident on the self-report measures, with the exception of a trend toward an interaction effect on the Sensation Seeking Scale. Exploratory analyses suggested that the significant effects were not a function of population stratification or gender. Discussion: These data suggest that the DRD2 TaqI A and DRD4 VNTR polymorphisms influence impulsivity as measured with a delay discounting task. Specifically, these findings suggest that an interaction between the functional effects of the two unlinked genotypes results in significant difference in the balance of mesolimbic dopaminergic activation relative to frontal-parietal activation. However, these findings are also the first in this area and must be replicated. Conclusion: These findings suggest a meaningful interaction between the DRD2 TaqI A and DRD4 VNTR polymorphisms in the expression of impulsivity and provide initial support for the utility of using behavioral measures for clarifying genetic influences on impulsivity. Page 1 of 14 (page number not for citation purposes) Behavioral and Brain Functions 2007, 3:2 http://www.behavioralandbrainfunctions.com/content/3/1/2 Background Garceiro et al. [44] did not replicate that relationship. The effort to characterize the behavioral effects of genetic Within the dopamine system, Retz et al. [45] found an polymorphisms has produced a massive web of ambigu- association between heterozygotes of the DRD3 single ous associations and linkages [1-3]. One strategy to clarify nucleotide polymorphism (SNP) and increased impulsiv- the genetic bases of behavior is the endophenotype ity, and Limosin et al. [46] found an association with the approach [2,4,5], which seeks to elucidate genetic associ- A2 alleles of the DRD2 TaqI A SNP and increased impul- ations with phenotypes of interest, typically diseases, by sivity in alcoholics, but both represent isolated reports. examining intermediary phenotypes (i.e., endopheno- More broadly, in studies of the genetics of personality, types) that are more closely related to the functional influ- impulsivity has been examined in the context of novelty ence of genetic variants. By characterizing seeking, a trait of which it is a cardinal feature [47]. From endophenotypes, or "upstream" phenotypes that do not this perspective, a number of studies have found associa- always result in the "downstream" disorder, progress may tions between long alleles of the DRD4 48 bp Variable be made in both deconstructing the etiologies of complex Number of Tandem Repeats (VNTR) polymorphism and psychiatric disorders and understanding the genetic and novelty-seeking, but many have not. One meta-analysis evolutionary basis for variation in non-disordered indi- has found no overall association between DRD4 48 bp and viduals [4]. In addition, endophenotypes are putatively novelty seeking [48], another a small effect [49] and a more closely connected to genetic functionality, so larger third review reports a positive association [50]. On bal- magnitude genetic effects may be evident and thus more ance, the current empirical literature is highly heterogene- readily detectable in smaller samples [6,7], cf. [8]. ous, in terms of the genes examined, phenotypic scales used and actual findings. Impulsivity is a prototypic candidate for the endopheno- type approach because it is a trait that varies considerably A limitation of the previous attempts to characterize in the overall population [9-12] and is associated with an genetic influences on impulsivity has been the prevailing array of psychiatric disorders. These include alcohol and reliance on self-report measures of impulsivity. There are drug dependence [13-19], pathological gambling [20,21], a number of limitations to the self-report measures in gen- attention deficit-hyperactivity disorder (ADHD) [22,23], eral [51,52] and these apply also in the case of impulsiv- borderline personality disorder [24] and antisocial per- ity. For example, individuals may vary considerably in sonality disorder [25-27]. Moreover, there is evidence for their semantic construal of impulsivity-related question the heritability of impulsive behavior in both humans content and they may also vary in their positive or nega- and non-human animals [28]. In terms of personality dis- tive attributions about the content of the questions, creat- orders, familial transmission of impulsive traits have been ing an implicit or explicit response bias. Moreover, there reported [24,29]. In addition, twin studies using the Karo- is considerable evidence that individuals' self-reports can linska Scale of Personality (KSP), Multidimensional Per- be substantially at variance with their actual behavior sonality Questionnaire (MPQ) and Barratt Impulsivity [51,52], suggesting that self-reported impulsivity may not Scale, Version 11 (BIS) also found substantial heritable always accurately reflect actual levels of impulsivity. This components to impulsivity [30-33]. Similarly, impulsivity is further complicated by the fact that impulsivity is itself has also been demonstrated to be heritable in
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