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COMTVal158Met genotype is associated with reward learning: a replication study and meta-analysis

Corral-Frías, N. S., Pizzagalli, D. A., Carré, J. M., Michalski, L. J., Nikolova, Y. S., Perlis, R. H., Fagerness, J., Lee, M. R., Conley, E. Drabant, Lancaster, Thomas ORCID:, Haddad, S., Wolf, A., Smoller, J. W., Hariri, A. R. and Bogdan, R. 2016. COMTVal158Met genotype is associated with reward learning: a replication study and meta-analysis. Genes, Brain and Behavior 15 (5) , pp. 503-513. 10.1111/gbb.12296

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Identifying mechanisms through which individual differences in reward learning emerge offers an opportunity to understand both a fundamental form of adaptive responding as well as etiological pathways through which aberrant reward learning may contribute to maladaptive behaviors and psychopathology. One candidate mechanism through which individual differences in reward learning may emerge is variability in dopaminergic reinforcement signaling. A common functional polymorphism within the catechol-O-methyl transferase gene (COMT; rs4680, Val158Met) has been linked to reward learning, where homozygosity for the Met allele (linked to heightened prefrontal dopamine function and decreased dopamine synthesis in the midbrain) has been associated with relatively increased reward learning. Here, we used a probabilistic reward learning task to asses response bias, a behavioral form of reward learning, across three separate samples that were combined for analyses (age: 21.80 ± 3.95; n = 392; 268 female; European-American: n = 208). We replicate prior reports that COMT rs4680 Met allele homozygosity is associated with increased reward learning in European-American participants (β = 0.20, t = 2.75, P < 0.01; ΔR2 = 0.04). Moreover, a meta-analysis of 4 studies, including the current one, confirmed the association between COMT rs4680 genotype and reward learning (95% CI −0.11 to −0.03; z = 3.2; P < 0.01). These results suggest that variability in dopamine signaling associated with COMT rs4680 influences individual differences in reward which may potentially contribute to psychopathology characterized by reward dysfunction.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Neuroscience and Mental Health Research Institute (NMHRI)
Publisher: Wiley-Blackwell
ISSN: 1601-1848
Date of First Compliant Deposit: 14 June 2017
Date of Acceptance: 14 April 2016
Last Modified: 11 May 2023 05:46

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