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A study published in Nature analyzed data from up to 1.14 million people and identified 1,260 genetic variants associated with the Big Five personality traits. Common variants explained about 5% to 9% of measured differences, and researchers say the findings cannot predict an individual’s personality or future behavior.
A study combining data from as many as 1.14 million people identified 1,260 genetic variants associated with the Big Five personality traits, but found no single gene that determines a person’s character. Published in Nature, the research indicates that common genetic variants explain about 5% to 9% of measured personality differences, with environment and many small genetic effects also involved.
The analysis brought together results from 46 research groups. Depending on the trait, the sample sizes ranged from 611,000 to 1.14 million people. Researchers examined extraversion, agreeableness, conscientiousness, neuroticism and openness to experience. Of the 1,260 variants identified, 824 were in regions not previously linked to the corresponding trait, according to the study summary.
The findings point to a highly distributed genetic influence rather than a set of distinct “personality genes.” Researchers estimated that more than 16,000 common variants independently contribute to each of the five traits, with each variant having a small effect. The genetic associations were generally similar across age groups, Western regions, personality tests and whether ratings came from participants themselves or someone who knew them. Agreeableness was less consistent across those comparisons.
The study also reported genetic overlap between personality and a range of health and behavioral outcomes. Genetic profiles associated with neuroticism were linked to increased risk across the psychiatric conditions examined. Those associated with conscientiousness were linked to less substance use and more frequent exercise. These are population-level associations, not evidence that a personality trait causes a health outcome or that an individual’s risk can be determined from the results.
What the Genetic Links Can Show
The results offer researchers a larger map of how common genetic differences relate to personality and its connections with health and behavior. Because the analysis drew on many research groups and large samples, it could identify associations that smaller studies may have missed. The finding that 824 variants were in newly linked regions adds potential directions for future research, while the broad pattern underscores that personality’s genetic architecture is complex.
The findings do not provide a genetic test for character. The researchers reported that genetic measures predicted behavior only to a small degree and cautioned that they cannot forecast a person’s future behavior. Personality reflects genetic and environmental influences; the study’s results describe statistical patterns across groups, not fixed outcomes for individuals. That distinction matters when interpreting connections between traits, mental health and health-related behaviors.
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How Researchers Tested the Associations
The paper, titled Robust inference and correlates from genetic associations with personality, was published in Nature and combined analyses from 46 research groups. The study compared genetic data with measures of the Big Five traits, a widely used framework covering extraversion, agreeableness, conscientiousness, neuroticism and openness to experience.
To examine whether family environments might account for some observed links, the researchers also compared people within families. Those analyses suggested that most genetic associations could not be explained by environmental factors shared among family members, which can complicate studies of genetics and behavior. This analysis addresses one possible source of bias; it does not mean that environment has no role in personality.
The research was led by a team including Henry R. Kranzler, a University of Pennsylvania psychiatry professor and director of its Center for Studies of Addiction. The journal citation lists the authors as Schwaba and colleagues, with the paper’s DOI 10.1038/s41586-026-10992-9.
“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 psychiatry professor
Limits Across People and Populations
The study’s findings do not establish how well the associations apply to people from ancestral and cultural backgrounds not adequately represented in the available data. The researchers said larger studies with more diverse populations are needed to test how consistently the patterns hold. The sample sizes varied by trait, and the results were generally consistent across the Western regions and measurement approaches examined, but that does not settle their applicability elsewhere.
It also remains unclear how the identified associations might help explain the pathways linking personality with health outcomes. Genetic overlap does not by itself establish cause and effect. The reported 5% to 9% estimate refers to differences in personality measured in the study’s primary analysis; it should not be read as a percentage of an individual’s personality that is genetically fixed.
Broader Samples Are the Next Test
The researchers point to studies with larger and more diverse samples as a next step, particularly to assess whether the genetic patterns hold across a wider range of ancestry and culture. Further work could also examine how the associations relate to health and behavior without treating statistical overlap as proof of causation.
For now, the Nature study provides a large-scale account of genetic associations with the Big Five, not an individual prediction tool. Any future use of these results would require evidence beyond the associations reported here, including validation across populations and a clear account of what the measures can—and cannot—predict.
Key Questions
Which personality traits did the study examine?
It examined the Big Five: extraversion, agreeableness, conscientiousness, neuroticism and openness to experience.
Did researchers find genes that determine personality?
No. The study identified 1,260 associated variants and estimated that more than 16,000 common variants contribute independently to each trait. The reported effects are small, and the researchers said personality is also shaped by environmental influences.
Can the findings predict an individual’s behavior?
No. Researchers said the genetic measures predicted behavior only to a small degree and cannot predict an individual’s future behavior. The results describe associations across groups.
How much of measured personality variation did common variants explain?
Common variants explained about 5% to 9% of the differences in personality measured in the study’s primary analysis. This is a study-level estimate, not a measure of how much of any one person’s personality is determined by genes.
Do the findings apply equally across populations?
That is not yet clear. The associations were generally similar across the Western regions and other comparisons examined, but researchers called for larger studies covering more ancestral and cultural backgrounds.
Source: news-medical.net
