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A study published in Nature identified 1,260 genetic variants associated with the Big Five personality traits, drawing on data from as many as 1.14 million people. Common variants explained about 5% to 9% of measured personality differences; the researchers say the findings describe group-level patterns, not a way to predict an individual’s personality or future behavior.
A study drawing on genetic data from as many as 1.14 million people identified 1,260 variants associated with the Big Five personality traits, but found no single genetic switch for any trait. Published in Nature, the research indicates that common genetic variants explain only a small share of measured personality differences and cannot predict an individual’s behavior.
The researchers combined results from 46 research groups. Depending on the trait, the analyses included between 611,000 and 1.14 million participants. The five traits were extraversion, agreeableness, conscientiousness, neuroticism and openness to experience. Of the 1,260 associated variants, 824 were in genetic regions not previously linked to the corresponding trait.
The results point to a highly distributed genetic contribution. The study estimated that more than 16,000 common variants independently contribute to each trait, with each variant having a small effect. In the primary analysis, common variants accounted for about 5% to 9% of measured differences in personality.
Patterns of genetic association were generally similar across age groups, Western geographic regions, personality questionnaires and whether traits were self-reported or assessed by someone who knew the participant. Agreeableness showed less consistency than the other traits. Family-based analyses suggested that most associations were not explained by environmental factors shared among relatives, the study reported.
What the Genetic Links Can Show
The findings give researchers a larger set of genetic associations to examine when studying why personality traits correlate with health, behavior and mental health. The study reported genetic overlap between personality and a range of outcomes, including psychiatric conditions, substance use and physical health. For example, genetic profiles associated with neuroticism were linked to higher risk across the psychiatric conditions studied; profiles associated with conscientiousness were linked to less substance use and more frequent exercise.
These are statistical associations across groups, not evidence that a particular personality trait causes a health outcome. The researchers cautioned that genetic measures predicted behavior only to a small degree and should not be used to forecast what an individual will do. The results also underline that personality reflects environmental influences as well as genetic ones.
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How the Big Five Study Was Built
The study, “Robust inference and correlates from genetic associations with personality,” was published in Nature in 2026. Its authors pooled data from multiple research groups to improve the statistical power of analyses of traits that are influenced by many genetic differences, each with a limited effect. The work examined the Big Five framework: extraversion, agreeableness, conscientiousness, neuroticism and openness to experience.
Henry R. Kranzler, a study co-author and professor of psychiatry at the University of Pennsylvania’s Perelman School of Medicine, said the results did not point to a single gene for a trait. Instead, they found many genetic differences that contribute small amounts alongside environmental influences. The authors also called for larger studies that include more ancestral and cultural backgrounds to test how well the reported patterns apply across populations.
“There isn’t a single gene for being outgoing or conscientious. What we see instead are thousands of genetic differences that individually contribute a small amount, but collectively shape personality, alongside the many influences of a person’s environment.”
— Henry R. Kranzler, study co-author and University of Pennsylvania professor of psychiatry
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Limits Across People and Populations
The results do not establish how much a specific person’s personality is shaped by genetics, nor do they support reliable predictions about that person’s future behavior. The reported 5% to 9% estimate concerns differences measured across participants in the study’s primary analysis; it is not a personal forecast or a measure of how fixed an individual’s traits are.
The researchers said broader studies are needed to determine whether the patterns hold across more ancestral and cultural backgrounds. The current findings drew on data from Western regions, and the study reported less consistent results for agreeableness. The reported links between personality-related genetic profiles and health outcomes are associations; the source material does not establish that they are causal.
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Broader Samples and Follow-Up Research
The researchers say future studies should include larger and more diverse populations to test how consistently these genetic associations apply across ancestry and culture. Further research can also examine the reported overlap between personality and health or behavior, while distinguishing statistical association from cause.
For now, the study adds genetic associations for researchers to investigate, rather than a tool for assessing personality or predicting behavior in individuals. The findings’ reach beyond the populations represented in the data remains an open question.
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Key Questions
What did the study identify?
It identified 1,260 genetic variants associated with aspects of the Big Five personality traits. The researchers said personality involves many genetic differences with small individual effects, rather than one gene for a trait.
Which personality traits were studied?
The study examined extraversion, agreeableness, conscientiousness, neuroticism and openness to experience.
Can the findings predict an individual’s personality?
No. The study reported that genetic measures predicted behavior only to a small degree and cautioned that the associations cannot predict an individual’s future behavior.
How much of personality did common variants explain?
In the study’s primary analysis, common genetic variants explained about 5% to 9% of measured differences in personality. This is a group-level estimate, not a measure of how genetically determined any one person is.
Do the findings apply across all populations?
That remains unclear. The authors called for studies with more ancestral and cultural backgrounds to test how consistently the patterns apply beyond the populations represented in the current research.
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