An international team of scientists has discovered more than 1,200 genetic variants that are linked to the Big Five personality traits—openness to experience, conscientiousness, extraversion, agreeableness, and neuroticism. This study, led by the Revived Genomics of Personality Consortium, combined data from 46 research groups across the globe. Participants gave DNA samples and completed personality questionnaires. Researchers then compared the genetic data with the participants’ personality scores to find genetic links to each trait. The findings show that no single "personality gene" controls these traits, but instead, many genetic variants work together to influence them. While each individual genetic variant has only a small effect, the combined influence of many can be significant. These patterns were consistent across diverse populations, such as a genetic variant linked to extraversion in a young Dutch adult also predicting similar traits in an older American retiree. The study also found that the genetic variants related to personality traits overlap with those connected to other aspects of life, such as mental and physical health, lifespan, education, career paths, and how others perceive a person. Some of these links relate to everyday behaviors—like genetic variants tied to conscientiousness being associated with more daytime activity, and those linked to openness and extraversion being connected to a preference for staying up late. The research highlights the interaction between genetics and environment. For example, genetic variants associated with openness to experience were linked to a higher chance of moving to a more cosmopolitan neighborhood, which might reinforce or further shape that personality trait. These findings suggest that personality traits are important across various fields, including medicine, education, and the workplace. For instance, genetic variants linked to neuroticism predict more hospital visits, which could help health professionals, while variants related to openness are connected to income and job changes, which could be relevant to career researchers. The study was supported in part by grants from the National Institute of Mental Health and the National Institute on Aging.