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Our DNA May Help Decide How Nice We Are

Genes, Environment Impact Kindness, Generosity
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WebMD Health News
Reviewed by Laura J. Martin, MD

April 12, 2012 -- Are nice people born that way?

Partly, a new study suggests, but genes don't tell the whole story.

The new research adds to the evidence linking specific genes to kindness and generosity, but these traits were also influenced by views about whether the world was a threatening or non-threatening place.

So although DNA may influence behavior, people do not come pre-programmed to be kind or mean or altruistic or selfish, says lead researcher Michael Poulin, PhD, of the University at Buffalo.

"We are not just puppets of our genes," Poulin tells WebMD. "Genes influence niceness in combination with perceptions of social threat, which come from our past and present experiences."

Oxytocin, Vasopressin: Niceness Genes?

Poulin and colleagues from the University at Buffalo and the University of California, Irvine, focused their research on the closely related hormones oxytocin and vasopressin, which have previously been linked to social behaviors, including love, generosity, and empathy.

They wanted to find out how expression of the two genes interacted with people's experiences and feelings to affect behavior.

To do this, they surveyed people via the Internet about their views on civic responsibility, such as whether they considered it their duty to report crimes or pay taxes, and whether they participated in charitable activities such as giving blood or attending PTA meetings.

The study participants were also asked if they viewed other people as basically "good" or "bad," and if they saw the world as more "threatening" or "non-threatening."

About 700 of those who participated also provided saliva samples for DNA analysis, which showed whether they had the specific genetic receptors for oxytocin and vasopressin that have been linked to traits associated with niceness.

People who reported finding the world to be a threatening place were generally less likely to exhibit social behaviors linked to niceness, such as charitable giving -- unless they had these versions of the genes.

The study appears in this month's issue of the journal Psychological Science.

Poulin says the fact that the genes predicted behavior only in combination with people's experiences and feelings about the world isn't surprising, because most connections between DNA and social behavior are complex.

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