Navigation Links
Social factors trump genetic forces in forging friendships, CU-led study finds

"Nature teaches beasts to know their friends," wrote Shakespeare. In humans, nature may be less than half of the story, a team led by University of Colorado Boulder researchers has found.

In the first study of its kind, the team found that genetic similarities may help to explain why human birds of a feather flock together, but the full story of why people become friends "is contingent upon the social environment in which individuals interact with one another," the researchers write.

People are more likely to befriend genetically similar people when their environment is stratified, when disparate groups are discouraged from interacting, the study found. When environments were more egalitarian, friends were less likely to share certain genes.

Scientists debate the extent to which genetics or environmental factors -- "nature" or "nurture" -- predict certain behaviors, said Jason Boardman, associate professor of sociology and faculty research associate with the Population Program in CU-Boulder's Institute of Behavioral Science. "For all the social demographic outcomes we care about, whether it's fertility, marriage, migration, health, it's never nature or nurture.

"It's always nature and nurture," he said. "And most of the time it has a lot more to do with nurture."

Boardman's team included Benjamin Domingue, research associate in the Population Program at IBS; and Jason Fletcher, associate professor of health policy at the Yale School of Public Health. Their research was recently published in the Proceedings of the National Academy of Sciences.

Early last year, PNAS published a study reporting evidence that certain shared genes might determine peoples' choice of friends. Time magazine dubbed this "friends with (genetic) benefits."

Boardman is a sociologist who spent five years studying genetics at CU-Boulder's Institute for Behavioral Genetics to bring insights of the social sciences to the natural sciences. He observed: "You can't understand the spread of health behaviors -- why people smoke, why they drink, why they may or may not be obese -- unless you understand their genetic liability and also place them in the right social context."

The research team used data from the National Longitudinal Study of Adolescent Health. Boardman's team focused on 1,503 pairs of friends in seventh through 12th grade in 41 schools. As with the earlier study, Boardman's group found that some pairs of friends shared certain genetic characteristics.

The team tested the evidence, arguing that if genes were the driving friendship factor, genetically based friendship should emerge most often and easily in schools with the least amount of social friction. "But we found the exact opposite," he said.

In the most socially equal environments, genetic homophily (or love of the same) was "pretty weak," meaning that friends were less likely to share genetic traits. He added, "It was in the most unequal social environments that we saw the highest level of genetic homophily."

In a socially stratified school, "Students from different populations within the school may be effectively 'off limits' for friendships," the team wrote.

While applauding the revolutionary advances in genetics in recent years, Boardman said "we have to have social scientists at the table, because we're the ones with the data, methods and theories to characterize the multidimensional and multilevel nature of the social environment."

Scientists cannot fully understand heritable changes in gene expression unless they understand "what kind of schools people go to, what neighborhoods they live in" and other social factors, Boardman said.

"To me, to say whether genes predict friendships without understanding the context within which these friendships may or may not occur just doesn't tell the whole story."

Contact: Jason Boardman
University of Colorado at Boulder

Related biology news :

1. Hermit crabs socialize to evict their neighbors
2. Academia should fulfill social contract by supporting bioscience startups, case study says
3. New research suggests bacteria are social microorganisms
4. Reciprocity an important component of prosocial behavior
5. Compounds shown to thwart stubborn pathogens social propensity
6. First Indian-European research networking projects in the social sciences launched
7. Helping family is key for social birds
8. Social bats pay a price with new fungal disease
9. NineSigma Launches NineSights, the Worlds First Open Innovation Social Media Destination for Innovation Seekers and Solution Providers
10. Scientists find that neurological changes can happen due to social status
11. Forest killer plant study explores rapid environmental change factors
Post Your Comments:
(Date:11/18/2015)...  As new scientific discoveries deepen our understanding of ... providers face challenges in better using that knowledge to ... as more children continue to survive pediatric cancer, that ... age. John M. Maris, M.D ., a ... (CHOP) . --> John M. Maris, ...
(Date:11/17/2015)... PARIS , November 17, 2015 ... 17 au 19 novembre  2015.  --> Paris ... 2015.  --> DERMALOG, le leader de l,innovation ... à la fois passeports et empreintes sur la même ... pour les passeports et l,autre pour les empreintes digitales. ...
(Date:11/16/2015)... , Nov 16, 2015  Synaptics Inc. ... human interface solutions, today announced expansion of its ... ™ touch controller and display driver integration ... of smartphones. These new TDDI products add to ... (HD resolution), TD4302 (WQHD resolution), and TD4322 (FHD ...
Breaking Biology News(10 mins):
(Date:12/1/2015)... , Dec. 1, 2015  CardioCell LLC, a ... stem cells for cardiovascular indications, intends to proceed ... based on recommendations from a Heart Failure Advisory ... Scientific Advisory Board members . In a ... Phase IIa safety and efficacy data from CardioCell,s ...
(Date:12/1/2015)... ... December 01, 2015 , ... ... marketing company specializing in scientifically backed, age-defying products, is featured as the ... highlights the exponential success and unrivaled opportunities that Nerium provides. Success from ...
(Date:12/1/2015)... 1, 2015 Dr. Harry Lander , President of Regen, ... Chief Science Officer and recruits five distinguished ... , President of Regen, expands his role to include ... recruits five distinguished scientists to join advisory team ... his role to include serving as Chief ...
(Date:12/1/2015)... 2015 ) ... U.K. Virology and Bacteriology Testing Market: Sales ... Supplier Shares by Test, Innovative Technologies, Competitive ... --> ) has announced ... and Bacteriology Testing Market: Sales and Volume ...
Breaking Biology Technology: