'Altruism Gene' Associated With Higher Willingness to Donate, Researchers Find
ScienceDaily (Nov. 8, 2010) — Do you like to do good things for other people? If so, your genes might be responsible for this. At least, the results of a study conducted by researchers of the University of Bonn suggest this. According to the study, a minute change in a particular gene is associated with a significantly higher willingness to donate. People with this change gave twice as much money on average to a charitable cause as did other study subjects.
New research reveals that a minute change in a particular gene is associated with a significantly higher willingness to donate. (Credit: iStockphoto/Feng Yu)
The results have now been published in the journal Social Cognitive & Affective Neuroscience.
The researchers working with the psychologist Professor Dr. Martin Reuter invited their students to take a "retention test": The roughly 100 participants were to memorize series of numbers and then repeat them as correctly as possible. They received the sum of five Euros for doing this. Afterwards, they could either take their hard-earned money home or donate any portion of it to a charitable cause. This decision was made freely and in apparent anonymity. "However, we always knew how much money was in the cash box beforehand and could therefore calculate the amount donated," explains Reuter.
The scientists had asked their study subjects to undergo a cheek swab beforehand. They were able to extract DNA for genetic analyses from the cells thus sampled. In these analyses, they focused on one gene, the so-called COMT gene. It contains the building instructions for an enzyme which inactivates certain messengers in the brain. The most well-known of these messengers is dopamine.
It has been known for nearly 15 years that there are two different variants of the COMT gene: COMT-Val and COMT-Met. Both versions, which occur in the population with approximately equal frequency, differ in only a single building block. In the case of people with the COMT-Val variant, the associated enzyme works up to four times more effectively. Thus considerably more dopamine is inactivated in the brain of a person with this variant.
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Investigating the genetic basis of altruism: the role of the COMT Val158Met polymorphism
Martin Reuter1,2, Clemens Frenzel1, Nora T. Walter1, Sebastian Markett1 and Christian Montag1
+Author Affiliations
1Department of Psychology, University of Bonn, and 2Center for Economics and Neuroscience, University of Bonn, Bonn, Germany
Correspondence should be addressed to Dr Martin Reuter, Department of Psychology, University of Bonn. Kaiser-Karl-Ring 9, D-53111 Bonn, Germany. E-mail: martin.reuter@uni-bonn-diff.de
Received June 16, 2010.
Accepted August 25, 2010.
Abstract
Findings from twin studies yield heritability estimates of 0.50 for prosocial behaviours like empathy, cooperativeness and altruism. First molecular genetic studies underline the influence of polymorphisms located on genes coding for the receptors of the neuropeptides, oxytocin and vasopressin. However, the proportion of variance explained by these gene loci is rather low indicating that additional genetic variants must be involved. Pharmacological studies show that the dopaminergic system interacts with oxytocin and vasopressin. The present experimental study tests a dopaminergic candidate polymorphism for altruistic behaviour, the functional COMT Val158Met SNP. N = 101 healthy Caucasian subjects participated in the study. Altruism was assessed by the amount of money donated to a poor child in a developing country, after having earned money by participating in two straining computer experiments. Construct validity of the experimental data was given: the highest correlation between the amount of donations and personality was observed for cooperativeness (r = 0.32, P ≤ 0.001). Carriers of at least one Val allele donated about twice as much money as compared with those participants without a Val allele (P = 0.01). Cooperativeness and the Val allele of COMT additively explained 14.6% of the variance in donation behaviour. Results indicate that the Val allele representing strong catabolism of dopamine is related to altruism.
Key words
altruism, COMT Val158Met, dopamine, prosocial behaviour, genetics
© The Author (2010). Published by Oxford University Press. For Permissions, please email: journals.permissions@oxfordjournals.org
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