Largest-ever genetic study of personality finds 1,260 DNA links to key traits

A sweeping genetic analysis of up to 1.14 million people has identified 1,260 specific DNA variations tied to the Big Five personality traits, making it the largest genomic study of personality to date. The findings, published in Nature, reveal that while no single "personality gene" exists, the cumulative effect of hundreds of small genetic variants produces consistent, measurable patterns across populations.psypost

What the Research Found

The study, led by Ted Schwaba of Michigan State University and conducted by the Revised Genomics of Personality Consortium, drew on data from 46 research cohorts spanning multiple countries. Participants provided DNA samples and completed questionnaires measuring extraversion, agreeableness, conscientiousness, neuroticism, and openness to experience. Of the 1,260 genome-wide associations identified, 824 had never been linked to personality before.realsimple+1

"Personality traits are associated with many genetic variants, but even the largest effects of individual genetic variants are still very small," Schwaba said, as reported by PsyPost. "However, even though any individual genetic variant makes very little difference in personality, the effects of many variants together can be more sizeable."psypost

Individually, common DNA variants explained between 4.8 and 9.3 percent of personality variation, well below the 40 to 60 percent heritability estimates from twin studies. To test whether shared family environments were inflating results, the researchers compared siblings and found the genetic associations held steady, suggesting the links reflect direct biological inheritance rather than upbringing.yahoo+1

Beyond Personality

The genetic variants identified reached well beyond temperament. Variants linked to conscientiousness were associated with lower substance use, greater physical activity, reduced hospital visits, and healthier aging. Variants tied to neuroticism predicted more time spent in the hospital and were associated with anxiety and depression-related conditions. Openness to experience, meanwhile, predicted a tendency to move to more cosmopolitan neighborhoods.realsimple+1

The researchers also found evidence running in the other direction: life factors such as educational attainment and changes in body mass index appeared to shift personality traits over time, supporting the idea that biology and environment continuously interact.psypost

Limitations and Outlook

About 95 percent of participants were of European genetic ancestry, meaning the findings may not generalize to other populations. Researchers also stressed that genetic scores cannot predict any single individual's personality.yahoo

"General readers often think of genetic influences as implying that something is set in stone, and that is certainly not the right takeaway," Jasmin Wertz, a researcher at the University of Edinburgh who was not involved in the study, told PsyPost. "The genetic influences identified here are far from 100%, leaving much room for non-genetic influences."psypost