Your friends' genes could be affecting your well-being: But how?
A groundbreaking study conducted by Rutgers University in New Jersey has discovered a potential link between the genetic makeup of our childhood and adolescent social circles, and our own health risks. The research suggests that the risk for health issues such as drug addiction and psychiatric disorders, may be influenced by the genetic predispositions of our peers. This study analyzed over 650,000 Swedish health registry records to explore this intriguing connection.
Study explores genetic risk scores and peer influence
The research team examined data from individuals aged 17 to 30, as well as their extended families. They calculated family genetic risk scores, which indicate the probability of inheriting addiction or mood disorders. These scores were then cross-referenced with location and school information, to identify any correlation between these genetic risks and similar issues among school peers or community members.
Findings suggest influence of peers' genetic risks
The study found that individuals who associated with peers having a higher genetic risk for certain health problems, were more likely to develop these issues themselves. This was true even if they did not carry the same risk in their own genes. "Peers' genetic predispositions for psychiatric and substance use disorders are associated with an individual's own risk of developing the same disorders in young adulthood," stated Jessica Salvatore, a psychiatrist at Rutgers University.
Socio-genomics: A new field exploring genetic influence
The study is part of an emerging field known as socio-genomics, which investigates how one person's genotype can impact the observable traits of another. The research focused on issues like drug use disorder, alcohol use disorder, major depression, and anxiety disorder. It was found that the likelihood of being influenced by a peer group varied depending on the health problem but was higher for substance use disorders.
Peer genetic influences extend beyond individual risk
The study also found a smaller but still significant influence among those living in the same area, particularly between the ages of 16 to 19. Interestingly, this association persisted even if the genetic risk hadn't manifested itself. The researchers aim to use these findings to enhance diagnosis and treatment methods. "Peer genetic influences have a very long reach," says Salvatore. "It's not enough to think about individual risk."
