By Will Dunham
WASHINGTON Mon May 19, 2014 5:02pm EDT
<span id="articleText"><span id="midArticle_start"/> WASHINGTON (Reuters) - He leaves the toilet seat up, prefers old Japanese monster movies to romantic comedies and fancies mixed martial arts over ballet. So what do you have in common with your husband?
<span id="midArticle_1"/>More than you may think.
<span id="midArticle_2"/>People tend to choose spouses who have similar DNA, according to scientists who reported on Monday the results of a study exploring the genetic resemblance of married couples.
<span id="midArticle_3"/>The researchers examined the genetic blueprints of 825 U.S. married couples and found a significant preference for a spouse with DNA similarities across the entire human genome.
<span id="midArticle_4"/>The study compared this affinity for husbands or wives with similar DNA makeup to the well-established and strong tendency of people to marry mates with similar educational levels. The researchers found that the preference for a genetically similar spouse was about a third as strong as the preference for a spouse with comparable education.
<span id="midArticle_5"/>The 1,650 people studied in the research were non-Hispanic, white men and women born between the 1930s and 1950s who were taking part in a broader U.S. government-funded study involving health and retirement.
<span id="midArticle_6"/>"We do know in some sense that people prefer genetically similar spouses because we know that people tend to date and marry within their own racial and ethnic groups. We worked really hard in this study to not just replicate that fact," said researcher Benjamin Domingue of the University of Colorado's Institute of Behavioral Science, who led the study.
<span id="midArticle_7"/>"We eliminated racial variability and tried to control for ethnic variability. And we still find a preference for genetically similar individuals," Domingue added.
<span id="midArticle_8"/>The researchers measured genetic similarity by comparing 1.7 million individual DNA building blocks, known as single nucleotide polymorphisms, in the study participants. They compared the genetic makeup of the married couples to other randomly chosen people of the opposite sex in the same pool of study participants.
<span id="midArticle_9"/>Domingue said the actual mechanism for a person being drawn to another person's genetic similarities is probably complicated and multifaceted - "just a whole host of things," he noted.
<span id="midArticle_10"/>The researchers noted that people usually pick spouses with similar backgrounds and characteristics in addition to education, including race, religion, age, income and body type. Genetic similarity can be added to the list, they said.
<span id="midArticle_11"/>"For example, people clearly care about height in picking partners. To the extent that tall people marry other tall people, that is going to result in genetic similarity among spouses. But it is difficult to know whether height or genes is driving this decision," Domingue said.
<span id="midArticle_12"/>The researchers said it would be interesting to see the results of similar studies involving other populations including additional races, interracial spouses and gay couples.
<span id="midArticle_13"/><span id="midArticle_14"/>(Reporting by Will Dunham, editing by G Crosse)
<span id="midArticle_15"/>
WASHINGTON Mon May 19, 2014 5:02pm EDT
<span id="articleText"><span id="midArticle_start"/> WASHINGTON (Reuters) - He leaves the toilet seat up, prefers old Japanese monster movies to romantic comedies and fancies mixed martial arts over ballet. So what do you have in common with your husband?
<span id="midArticle_1"/>More than you may think.
<span id="midArticle_2"/>People tend to choose spouses who have similar DNA, according to scientists who reported on Monday the results of a study exploring the genetic resemblance of married couples.
<span id="midArticle_3"/>The researchers examined the genetic blueprints of 825 U.S. married couples and found a significant preference for a spouse with DNA similarities across the entire human genome.
<span id="midArticle_4"/>The study compared this affinity for husbands or wives with similar DNA makeup to the well-established and strong tendency of people to marry mates with similar educational levels. The researchers found that the preference for a genetically similar spouse was about a third as strong as the preference for a spouse with comparable education.
<span id="midArticle_5"/>The 1,650 people studied in the research were non-Hispanic, white men and women born between the 1930s and 1950s who were taking part in a broader U.S. government-funded study involving health and retirement.
<span id="midArticle_6"/>"We do know in some sense that people prefer genetically similar spouses because we know that people tend to date and marry within their own racial and ethnic groups. We worked really hard in this study to not just replicate that fact," said researcher Benjamin Domingue of the University of Colorado's Institute of Behavioral Science, who led the study.
<span id="midArticle_7"/>"We eliminated racial variability and tried to control for ethnic variability. And we still find a preference for genetically similar individuals," Domingue added.
<span id="midArticle_8"/>The researchers measured genetic similarity by comparing 1.7 million individual DNA building blocks, known as single nucleotide polymorphisms, in the study participants. They compared the genetic makeup of the married couples to other randomly chosen people of the opposite sex in the same pool of study participants.
<span id="midArticle_9"/>Domingue said the actual mechanism for a person being drawn to another person's genetic similarities is probably complicated and multifaceted - "just a whole host of things," he noted.
<span id="midArticle_10"/>The researchers noted that people usually pick spouses with similar backgrounds and characteristics in addition to education, including race, religion, age, income and body type. Genetic similarity can be added to the list, they said.
<span id="midArticle_11"/>"For example, people clearly care about height in picking partners. To the extent that tall people marry other tall people, that is going to result in genetic similarity among spouses. But it is difficult to know whether height or genes is driving this decision," Domingue said.
<span id="midArticle_12"/>The researchers said it would be interesting to see the results of similar studies involving other populations including additional races, interracial spouses and gay couples.
<span id="midArticle_13"/><span id="midArticle_14"/>(Reporting by Will Dunham, editing by G Crosse)
<span id="midArticle_15"/>
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