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Polygenic Associations With Educational Attainment in East Versus West Germany: Differences Emerge After
Deniz Fraemke1, Yayouk E Willems1, Aysu Okbay2,3,4
1Max Planck Research Group Biosocial - Biology, Social Disparities, and Development, Max Planck Institute for Human Development, Berlin, Germany.
Psychological Science
|July 9, 2025
Summary
Genetic influences on educational attainment differed between East and West Germany after reunification. Polygenic scores showed amplified education-genetic associations in East Germany, suggesting gene-environment interactions influenced by social opportunities.
Area of Science:
- Behavioral Genetics
- Sociogenomics
- Human Evolutionary Biology
Background:
- Polygenic indices derived from genome-wide association studies (GWAS) are valuable tools for exploring genetic influences on complex traits.
- Educational attainment is a key socioeconomic trait influenced by both genetic and environmental factors.
- Understanding gene-environment interactions is crucial for explaining variations in trait expression across different populations and historical contexts.
Purpose of the Study:
- To investigate geographical and historical differences in polygenic associations with educational attainment in East and West Germany around reunification.
- To examine gene-environment interactions influencing educational attainment in a German cohort.
- To determine if observed genetic associations are specific to educational attainment or a general trend.
Main Methods:
- Utilized a DNA-based polygenic index derived from a prior GWAS on educational attainment.
- Analyzed data from 1,930 individuals (aged 25-85) from the SOEP-G[ene] cohort.
- Conducted a control analysis using a polygenic index for height to assess specificity.
Main Results:
- Polygenic associations with educational attainment did not differ between East and West Germany before reunification.
- A significant increase in polygenic associations with educational attainment was observed in East Germany after reunification.
- This gene-environment interaction remained robust and was unlikely due to a general trend in genetic associations.
Conclusions:
- The amplification of education-genetic associations in East Germany post-reunification aligns with theories of heightened genetic influence during periods of increased social and educational opportunity.
- Gene-environment interactions play a significant role in shaping educational attainment.
- Replication in larger German genetic datasets is needed to confirm these findings.
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