A groundbreaking study involving 1.14 million people across 46 research groups has identified 1,260 genetic variants associated with human personality. The research, published in Nature, provides new insights into the connections between DNA, behavior, health, and various aspects of everyday life. The study focused on the five major personality traits known as the Big Five: extraversion, agreeableness, conscientiousness, neuroticism, and openness to experience.
The researchers found that personality is influenced by thousands of genetic differences, with each individual variant making only a tiny contribution. There is no single gene that determines whether someone is outgoing, anxious, organized, or adventurous. The combined effects of many genetic variants may be more meaningful, but genetics still explains only part of the differences seen between people. The study found that common genetic variants accounted for about 4.8 to 9.3 percent of the variation in measured personality traits.
The research also discovered that genetic patterns associated with personality were connected to a wide range of life outcomes, including physical and mental health, longevity, education, career choices, income, and everyday behaviors. For example, genetic patterns associated with conscientiousness were linked to behaviors such as greater daytime activity. Variants associated with openness and extraversion were connected with differences in sleep patterns and a greater tendency to remain active later in the day.
The study's findings suggest that personality may influence many areas of life, while genetic factors that contribute to personality may also be linked to biological and behavioral pathways that affect those outcomes. However, these associations do not mean that a person's DNA determines their career, income, or health. Instead, the findings show statistical relationships across large populations and cannot be used to predict exactly how a particular person's life will unfold.
The researchers also found links between personality-related genetic patterns and employment outcomes, including income and job changes. The study provides evidence that genetics and environment are closely intertwined, with a person's genetic tendencies influencing the environments they choose or encounter, and those environments reinforcing or modifying aspects of their personality.
Despite the size of the study, scientists caution against interpreting the findings as a way to determine someone's personality from their DNA. The individual genetic effects were extremely small, and genetic variants explain only a modest share of personality differences. The results point to personality as a highly complex trait shaped by the combined effects of biology, environment, and life experience.
The study's findings could have implications far beyond psychology, opening new areas of research in medicine, public health, and the social sciences. Understanding how personality-related genetic factors are connected with health, education, work, and behavior could lead to new insights and discoveries. The researchers say that the study's results highlight the complexity of personality and the need for further research into its underlying factors.
Key points
- Scientists identified 1,260 genetic variants linked to human personality.
- Genetic variants account for 4.8 to 9.3 percent of personality differences.
- Personality is a complex trait influenced by biology, environment, and life experience.
