Vol 7.10 "Cheating Gene" 9/19/2008

It’s September 3, 2008. I came across a news article, ‘Marriage Problems? Husband’s Genes May Be to
Blame’, by ABC News last night that I would like to share with everyone regarding a cheating gene
in men. Men, please don’t use this article as an excuse for your promiscuity. Women, beware! I
hope you will enjoy it as much as I did. Also, you can view the whole research via this link:
http://www.pnas.org/content/early/2008/09/02/0803081105.abstract.

Here’s the article (http://abcnews.go.com/Health/wireStory?id=5708392):
Marriage Problems? Husband’s Genes May Be to Blame
By Maggie Fox, Health and Science Editor
September 2, 2008

WASHINGTON (Reuters) – The same gene that affects a rodent’s ability to mate for life may affect human
marriages, Swedish and U.S. researchers reported on Tuesday. Men carrying a common variation of a
gene involved in brain signaling were more likely to be in unhappy marriages than men with the other
version, the team at the Karolinska Institute found.

Although they are not sure what the genetic changes do to a man’s behavior, some other research
suggests it has to do with the ability to communicate and empathize, the team reported in the
Proceedings of the National Academy of Sciences.

“We never looked at infidelity in our study at all. What we have been focusing on is how strongly men
bond to their partners,” Karolinska’s Hasse Walum, who led the study, said in a telephone interview.

Walum’s team had been intrigued by previous research that showed one genetic difference seemed to
explain why one species of vole formed strong pair bonds for life, while another mated promiscuously.
“Maybe this same gene will affect humans,” Walum said.

They looked at a study of 552 pairs of twins and their spouses that detailed measures of parent and child
relationships, marriage, personality and mental health of middle-class Swedes born between 1944
and 1971.

MONOGAMOUS RODENTS

The researchers tested the blood of men in the study, looking in particular for a gene that is similar in
humans and voles. Called AVPR1A, it helps explain why prairie voles are monogamous and mountain and
meadow voles are not.
The gene affects a brain chemical called neuropeptide arginine vasopressin and mostly affects blood
pressure through the body’s ability to retain water.

In humans, studies have shown certain variations of AVPR1A are linked with aggression, age at first
sexual intercourse and altruism. One study suggested a link with autism, which affects the ability to
interact socially, while another showed over-activation of the amygdala, the brain’s emotional center.

Walum’s team found that men with a gene variant, or allele, known as 334 earned low scores on their
partner bonding scale, and were less likely to be married at all.

Men carrying two copies of 334 were twice as likely to have had a marital crisis in the past year. Their
wives were much more likely to report dissatisfaction with their marriage.

“Fifteen percent of the men carrying no 334 allele reported marital crisis, whereas 34 percent of the men
carrying two copies of this allele reported marital crisis,” the researchers wrote.
More than 30 percent of the men who had at least one copy of 334 were unmarried, compared to 17
percent of the men who had no copies.

Walum said he has “no idea” how the genetic variant may actually affect a human being’s behavior and
stressed that larger studies must be done to test the association.

He would also like to test more unmarried men.

(Reporting by Maggie Fox; Editing by Julie Steenhuysen and Vicki Allen)
Copyright 2008 Reuters News Service. All rights reserved.

The founder and president of Diamond Cutters International, is one of the world’s top diamond experts, as well as a three-time Guinness Book record holder in jewelry design.
Fred The Diamond Guy
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