- The largest genetic investigation of the Big Five personality traits has identified 1,260 genetic variants associated with personality, including 824 previously unknown variants.
- This study analyzed data from 1.14 million people across 46 cohorts to identify genetic variants linked to the Big Five traits: extraversion, agreeableness, conscientiousness, neuroticism, and openness to experience.
- The findings indicate that genetic variants account for only 4.8% to 9.3% of the variation in personality traits, significantly lower than the 40-60% heritability suggested by earlier twin studies.
- The researchers discovered that family environment has minimal impact on personality, with genetic effects within families being similar to those found between unrelated individuals.
- A 1996 twin study compared identical and fraternal twins to assess the heritability of personality, laying the groundwork for understanding genetic influences.
- In 2015, a meta-analysis of over 100,000 people further examined the heritability of personality traits, contributing to the ongoing research in this field.
- A 2022 study involving 5.4 million people identified genetic variants linked to personality, which set the stage for the current findings.
- The 2024 study of the Big Five traits identified additional genetic variants, building on previous research.
A large-scale study involving 1.14 million participants has identified 1,260 genetic variants associated with the Big Five personality traits: extraversion, agreeableness, conscientiousness, neuroticism, and openness. This research, conducted by an international consortium, reveals that genetic factors account for only 4.8% to 9.3% of personality variation, significantly lower than the 40% to 60% suggested by classic twin studies.13
The study's lead author, Michel Nivard, stated, "Our genes clearly influence our personality predispositions... but there are clearly also substantial environmental causes of personality, which collectively explain the majority of individual differences." The research indicates that while genetics play a role, environmental factors are the primary drivers of personality development.
The analysis found that the genetic variation accounted for 7.4% to 10.6% of individual differences across the Big Five traits. However, when predicting personality using genetic information, researchers could explain less than 4% of the variation. This suggests that personality cannot be reliably predicted from DNA alone.
The study also highlights that there is no single "personality gene"; instead, each of the identified variants contributes only a microscopic effect. The average impact of the most influential variant linked to extraversion is equivalent to a mere 0.35 percentile difference in the population. This underscores the complexity of personality formation, where both genetic predispositions and environmental influences intertwine.
“The variants account for only 4.8% to 9.3% of personality variation, far below the 40-60% from twin studies. Family environment barely matters, as genetic effects within families mirror those in the general population.”
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