Study maps 1,260 genes linked to personality traits
The Revived Genomics of Personality Consortium has completed the largest genetic analysis of human behavior to date, identifying over 1,260 genetic variants connected to the five core personality traits known as the Big Five. These traits, neuroticism, extroversion, openness, agreeableness, and conscientiousness, were assessed using standardized questionnaires, while participants provided DNA samples to enable genome-wide association analyses.
The research gathered data from 46 research groups, covering participants with both European and African genetic backgrounds, and examined roughly 10 million genetic variants across 611,037 to 1.14 million individuals, depending on the trait. Genes, the specific segments of DNA that carry instructions for producing proteins and determining traits, were the focus of this investigation into why personality differences, such as why one sibling is outgoing while another prefers solitude, may have a genetic basis.
By examining these vast datasets, the team uncovered that 824 of the 1,260 variants had not previously been linked to personality. For instance, 706 variants showed connections to neuroticism, 258 were tied to extroversion, and the study also identified 131 variants for conscientiousness, 39 for agreeableness, and 126 for openness. The analysis accounted for shared family environments by including genetic data from relatives, confirming that while genes influence personality, their individual effects remain modest.
Lead researcher Ted Schwaba, an assistant professor of psychology at Michigan State University, emphasized that no single “personality gene” exists. Instead, thousands of small genetic variations interact to shape behavior, with environmental factors playing a significant role alongside them. The study’s scale allowed researchers to detect subtle genetic signals that earlier, smaller studies had missed, reinforcing that personality emerges from a combination of genetic and environmental factors rather than being fixed at birth.
The findings extend beyond personality itself, revealing broader links between genetic profiles and real-world behaviors. Variants associated with conscientiousness correlated with healthier habits, including better sleep patterns, daytime activity levels, and dietary choices, while those linked to neuroticism appeared more frequently in individuals with psychiatric disorders, higher body mass indexes, and smoking habits. Meanwhile, genetic markers for extroversion were linked to a reduced risk of internalizing disorders such as anxiety, depression, and ADHD. The study also explored connections between genetic predispositions and life outcomes, including education, career success, income, health, longevity, residential mobility, and even time spent in hospitals. However, the researchers stressed that these associations are not deterministic, environmental influences and personal experiences interact with genetics throughout development.
