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1 million people's genes reveal the heritability of the Big Five personality traits — and it's complicated | Live Science (opens in a new tab)

livescience.com · 2026-09-10

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Short answer

Mixed

Mixed.

The claims we could check match the study, but some claims were not covered by the evidence reviewed.

  • 1 supported
  • 1 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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1

The story

1 million people's genes reveal the heritability of the Big Five personality traits — and it's complicated | Live Science

livescience.com · 2026-09-10

The story’s checkable claims.

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Mixed

The one claim we could check holds up. One of two claims matches the study. This overall rating is based only on the claims we could check. One claim the study doesn't address.

  • 1 supported
  • 1 not covered
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2 claims in this story

Showing all 2 claimsChoose a verdict to focus the list.

Claim 1 of 2Not coveredThe supplied article text itself contains no reportable study findings beyond subscription and login prompts.View evidenceHide evidence

Why this verdict

This claim is about the supplied article text and access/login boilerplate, not about the scientific paper’s findings. The paper abstract cannot verify whether the story body contained no reportable study findings; that depends on the article text supplied to the story-extraction step rather than on the paper profile.

Claim 2 of 2SupportedThe headline says 1 million people's genes reveal the heritability of the Big Five personality traits, and that the picture is complicated.View evidenceHide evidence

As stated1 million people's genes

Why this verdict

The paper abstract supports the headline-level premise that a very large GWAS/meta-analysis, with sample sizes reported as ~611K–1.14M participants, examined genetic associations with the Big Five personality traits and estimated common-variant variance explained/SNP heritability. The headline’s '1 million people' is a reasonable simplification of the abstract’s sample-size range, and 'heritability' is supported in the abstract-level sense of common-variant variance explained. The vague phrase 'it’s complicated' is not a precise scientific claim but is directionally consistent with a multi-cohort genetic-architecture study rather than a single-gene explanation.

1

Study evidence

Meta-analysis across 46 cohorts identified 1,257 lead genetic variants associated with Big Five personality traits; 823 of these variants are described as novel.

“We assemble data from 46 cohorts including 611K-1.14M participants with European-like and African-like genomes for genome-wide association studies (GWAS) of the Big Five personality traits”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • The paper identified 1,257 lead genetic variants associated with personality, including 823 novel variants.

    The presented story content does not report the locus/variant discovery result. It only gives a broad headline about genes and heritability.

    From secondary_data

  • The paper estimated common genetic variants explain 4.8%–9.3% of variance in each Big Five trait, or 10.5%–16.2% after accounting for measurement unreliability.

    The headline mentions 'heritability' generally, but the presented story does not report the actual variance-explained/SNP-heritability ranges, nor the measurement-unreliability correction.

    From secondary_data

  • The paper reports that genetic effects on personality are highly consistent across geography, reporter type, age group, and measurement instrument, with minimal recent spousal assortment.

    No presented story claim covers the robustness/generalizability analyses or spousal assortment finding.

    From Stratified GWAS/meta-analysis and assortative-mating analysis

  • The paper reports within-family GWAS and polygenic-index analyses indicating little to no shared environmental confounding in genetic associations with personality.

    The presented story does not mention the within-family design, the ~51K within-family sample, or the conclusion about shared environmental confounding.

    From Within-family GWAS and within-family polygenic index analyses (family fixed-effects/sibling comparisons)

  • The paper uses polygenic prediction, genetic correlation, and Mendelian randomization to connect personality genetics with a wide range of behaviors and life outcomes, described as widespread and potentially causal associations.

    The presented story contains no downstream findings about behaviors, life outcomes, genetic correlations, polygenic prediction, or Mendelian randomization.

    From secondary_data genetic-epidemiology

1 thing the story did carry across
  • The paper’s main result is a large-scale multi-cohort GWAS/meta-analysis of Big Five personality traits across 46 cohorts with ~611K–1.14M participants.
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Pieces of work

4

Evidence read

study summary

Lead result

secondary data

1Lead resultsecondary dataLarge-scale multi-cohort GWAS meta-analysis identifies common-variant loci for the Big Five personality traits and estimates SNP-heritability/variance explained across ancestries.secondary dataExpand

In plain English

Large-scale multi-cohort GWAS meta-analysis of the Big Five personality traits across 46 cohorts (overall N range reported 611K–1.14M, including participants with European-like and African-like genomes) identified 1,257 lead genetic variants (823 novel) and estimated that common variants account for 4.8%–9.3% of trait variance (10.5%–16.2% after accounting for measurement unreliability).

Key findings

  • Meta-analysis across 46 cohorts identified 1,257 lead genetic variants associated with Big Five personality traits; 823 of these variants are described as novel.
  • Common genetic variants explain 4.8%–9.3% of variance in each personality trait; when accounting for measurement unreliability, the corresponding estimates are 10.5%–16.2%.4.8%–9.3% (observed); 10.5%–16.2% (corrected for measurement unreliability)
“We assemble data from 46 cohorts including 611K-1.14M participants with European-like and African-like genomes for genome-wide association studies (GWAS) of the Big Five personality traits”
What this piece can’t prove
  • Abstract does not specify the exact GWAS/meta-analysis methods (e.g., association model covariates, meta-analysis model, variant QC thresholds, LD reference panels).

3 further details could not be confirmed from the summary.

2secondary dataRobustness and generalizability of genetic effects on personality across geography, age, reporter type, and measurement instruments; assessment of spousal assortment.Stratified GWAS/meta-analysis and assortative-mating analysisExpand

In plain English

The study reports that genetic associations for the Big Five personality traits are highly consistent across geographic strata, reporter type (self vs close other), age groups, and measurement instruments, and that there is minimal spousal assortment for personality in recent history. These cross-strata robustness and assortative-mating conclusions are drawn from large-scale GWAS meta-analyses across dozens of cohorts (overall GWAS n range reported 611K–1.14M) with a smaller within-family GWAS (n ≈ 51K).

Key findings

  • Genetic effects on personality are highly consistent across geography, reporter (self vs close other), age group, and measurement instrument.
  • There is minimal spousal assortment for personality in recent history.
“Genetic effects on personality are highly consistent across geography, reporter (self vs. close other), age group, and measurement instrument, and we find minimal spousal assortment for personality in recent history.”
What this piece can’t prove
  • The abstract does not specify the exact methods or measures used to quantify spousal assortment (phenotypic vs genetic correlations) or the timeframe implied by 'recent history'.
  • Within-family analyses are reported at a smaller sample size (~51K), potentially limiting power to detect subtle within-family differences relevant to cross-strata robustness or mating structure.

2 further details could not be confirmed from the summary.

3secondary dataWithin-family GWAS and polygenic index analyses test for (and find little) shared environmental/genetic confounding in personality GWAS associations.Within-family GWAS and within-family polygenic index analyses (family fixed-effects/sibling comparisons)Expand

In plain English

The study reports within-family genome-wide association analyses (N ≈ 51,000) and within-family polygenic index (PGI/PGS) analyses for the Big Five personality traits. Comparing within-family estimates to population-level estimates, the authors report little to no evidence that shared family environmental confounding explains GWAS associations for personality.

Key findings

  • Within-family GWAS and polygenic index analyses indicate little to no shared environmental confounding in genetic associations with personality.
“and data from 51K participants for within-family GWAS.”
What this piece can’t prove
  • The within-family sample (≈51K) is much smaller than the population-level GWAS sample; abstract does not report formal power calculations for detecting modest shared-environmental confounding.

3 further details could not be confirmed from the summary.

4secondary dataDownstream analyses (polygenic prediction, genetic correlation, Mendelian randomization) link personality genetics to other traits/outcomes and assess potentially causal relationships.secondary data genetic-epidemiologyExpand

In plain English

Using GWAS-derived polygenic indices, genetic-correlation estimation, and Mendelian randomization, the authors evaluate links between personality genetics and a wide set of behaviors and life outcomes and report widespread, potentially causal associations; within-family and polygenic-index analyses are reported to show little-to-no shared environmental confounding.

Key findings

  • Polygenic prediction, genetic correlation, and Mendelian randomization analyses indicate that personality genetics have widespread, potentially causal associations with a wide range of consequential behaviors and life outcomes.
  • Within-family GWAS and polygenic-index analyses indicate little to no shared environmental confounding in genetic associations with personality.
“Polygenic prediction, genetic correlation, and Mendelian randomization analyses indicate that personality genetics have widespread, potentially causal associations with a wide range of consequential behaviors and life outcomes.”
What this piece can’t prove
  • Abstract does not report numerical effect sizes, confidence intervals, or the specific outcomes analyzed in downstream prediction/MR/gc analyses.

2 further details could not be confirmed from the summary.

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Papers considered

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PubMed, Europe PMC, Crossref · 15 candidate papers

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