Over 1,200 DNA markers linked to personality traits in massive new study

An international consortium published a landmark analysis in Nature, reporting 1,260 distinct genetic variants linked to the five major personality dimensions. The study pooled information from 1.14 million people in 46 separate groups, revealing that these markers account for 4.8%-9.3% of trait variation, a fraction of the heritability estimated by classic twin research. Unlike traits like education or income, family background contributed minimally to personality differences.

Lead author Michel Nivard emphasized the absence of any single dominant "personality gene," noting that even the strongest variant shifts an individual's score by only a few hundredths of a percentile. The findings also connected specific variants to lifestyle patterns, such as openness influencing urban relocation and conscientiousness correlating with lower smoking prevalence. While the results underscore a genetic component, they reaffirm that upbringing and broader social experiences remain the primary drivers of personality development.