A genome-wide study of up to 1.14 million people identified 1,260 variants associated with Big Five personality traits, yet common variants together explained only a modest share of measured differences.

Published: September 3, 2026, 9:27 p.m. PKT · Reporting cutoff: September 3, 2026, 9:15 p.m. PKT

What you need to know

  • The analysis combined 46 cohorts with between 611,037 and 1.14 million participants, depending on the personality trait.
  • Researchers identified 1,260 lead genetic variants associated with the Big Five traits; 824 had not been reported in the earlier reference study.
  • Common variants explained an estimated 4.8% to 9.3% of variation in each measured trait.
  • Each individual variant had a tiny effect, making the results unsuitable for reading a person’s character from DNA.
  • The study is an association analysis, not proof that the variants cause personality or that environment matters less.

There is no single gene for being outgoing, anxious, organized, agreeable or curious. Instead, the largest genetic study of the Big Five personality traits has mapped a broad constellation of DNA variants, each contributing an almost imperceptible statistical nudge.

The scale is the news: 1,260 associated variants across data from as many as 1.14 million people. The restraint is equally important. These associations describe average differences across populations; they do not encode a person’s destiny.

What the personality genetics study measured

The Revived Genomics of Personality Consortium pooled 46 cohorts. Participants completed personality questionnaires measuring extraversion, agreeableness, conscientiousness, neuroticism and openness to experience, while researchers searched across their genomes for variants that appeared more often with higher or lower trait scores.

Sample size varied by trait from 611,037 to 1.14 million people. The analysis found 1,260 lead variants, including 824 described as novel relative to the researchers’ prior reference. Enrichment patterns linked four traits—every one except agreeableness—to genes expressed in the prefrontal cortex, but enrichment does not identify a simple neural switch for personality.

How much of personality did common variants explain?

Taken together, common genetic variants accounted for an estimated 4.8% to 9.3% of the variation in measured traits. Those percentages describe variance within the studied populations; they do not mean that any individual is a fixed percentage genetic.

The effect of a single variant was minuscule. Nature illustrated this with the strongest extraversion association: carrying an additional copy would shift a person near the 50th percentile to only about the 50.35th percentile on average. Environment, development, relationships, culture, chance and measurement all remain consequential.

Why within-family analysis matters

Large genetic associations can be distorted when ancestry, geography or family circumstances correlate with both DNA and behavior. The researchers therefore performed within-family analyses in up to 50,725 participants, comparing relatives who share much of their background.

Many personality associations proved more robust to those family-level confounders than associations reported for outcomes such as education or income. That strengthens confidence that the signal is not entirely an artifact, but it still does not establish a direct causal path from a variant to a personality trait.

What the evidence cannot tell you about yourself

This study cannot diagnose personality from a genome, rank applicants, explain an individual’s behavior or justify biological stereotypes. Polygenic scores built from one ancestry group can also perform poorly in other populations, which makes broader representation an ethical as well as scientific requirement.

The most accurate interpretation is probabilistic: many variants appear to contribute tiny influences within a complex developmental system. DNA is part of the story, not the narrator.

How other headlines framed it

  • Nature News led with the contrast between anxious and outgoing behavior and emphasized more than 1,200 linked variants.
  • Science Media Centre Spain focused on the finding while presenting outside expert cautions.
  • El País framed DNA as one contributor to how personality takes shape.

What comes next

More diverse cohorts, repeated personality measurements and functional experiments are needed to test how associated regions influence brain development or behavior. Researchers must also distinguish biology from patterns created by who chooses to answer questionnaires.

Bottom line: The study makes the genetic map of personality far more detailed while making genetic determinism less defensible: thousands of tiny associations do not amount to a DNA personality test.

Sources

  1. Revived Genomics of Personality Consortium, “Robust inference and correlates from genetic associations with personality,” Nature, September 2, 2026.
  2. Nature News coverage, September 2, 2026.

Editorial disclosure: The lead image is an original concept illustration, not participant data or a study figure. SciQuest received no payment for this coverage. To report a possible error, contact SciQuest.