Abstract
Polygenic score (PGS) predictions of educational achievement are sizeable at the population level. Yet, population-level PGS predictions are environmentally confounded, due to gene-environment correlations, assortative mating, and population stratification. This confounding complicates the interpretation and application of PGS predictions of educational achievement. Here, we charted the variability of PGS predictions in N = 8115 dizygotic twins from UK, US, Swedish, and German samples aged 7 to 19 years. Population-level PGS predictions of educational achievement ranged from β = 0.16 to β = 0.37 across ages and countries. Discerning within- and between-family level estimates, we found that 10 to 65% of the population-level PGS predictions were due to environmental confounding, of which 29 to 100% were accounted for by family socioeconomic status. Variability in within-family and population-level PGS predictions was largely unsystematic across countries’ school systems (multi-tiered vs. comprehensive) and children’s ages. Therefore, interpretations regarding the sources of environmental confounding effects on educational achievement remain, at present, speculative.
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Data availability
The datasets used for this study are not openly available due to privacy and ethical requirements, yet data access can be requested for research purposes from the respective data owners. TEDS data are available upon request (https://www.teds.ac.uk/researchers/teds-data-access-policy). Details on measurement and sample characteristics are available in the TEDS data dictionary (https://www.teds.ac.uk/datadictionary/home.htm). E-Risk data are available upon request (https://www.eriskstudy.com/data-access/). To access the MTFS data, external researchers can request to collaborate with MTFS researchers [69]. The Swedish sample comprises use individual-level register data provided by Statistics Sweden, combined with data from the STR, which is administered by the Steering Committee of the Swedish Twin Registry. To access the data, researchers they must obtain approval from the Swedish Ethical Review Authority and from the Steering Committee of the Swedish Twin Registry. STR data are available upon request (https://ki.se/en/research/swedish-twin-registry-for-researchers). In this study, TwinLife data release 7.1.0 was used (https://doi.org/10.4232/1.14186). Data are available upon request (https://search.gesis.org/research_data/ZA6701). Information on measurement and sample characteristics are available via the TwinLife data documentation website (https://www.twin-life.de/documentation/downloads).
Code availability
No custom code was used for the analyses in this study. Data analyses were conducted in R (version 4.4.0) [48] and RStudio (version 2024.04.1) [70]. The analysis code can be obtained here: https://osf.io/jzp7c/?view_only=10fd9c9885844b519339de63c5a485fe.
Notes
Polygenic scores are also referred to as genome-wide score, polygenic index (PGI), or polygenic risk score/genetic risk score (in the context of medical risk).
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Acknowledgements
We thank the participating families and many contributors to the Twins Early Development Study (TEDS), the Minnesota Twin Family Study, the Swedish Twin Registry (STR), and TwinLife. We are grateful to the Environmental Risk (E-Risk) Longitudinal Twin Study mothers and fathers, the twins, and the twins’ teachers for their participation. Our thanks to Professors Terrie Moffitt and Avshalom Caspi, the founders of the E-Risk Study, and to the E-Risk team for their dedication, hard work and insights. The views expressed are those of the authors and not necessarily those of the ESRC or King’s College London.
Funding
TEDS is supported by the UK Medical Research Council (MR/V012878/1 and previously MR/M021475/1), with additional support from the US National Institutes of Health (AG046938). The Environmental Risk (E-Risk) Study is funded by grants from the UK Medical Research Council (MRC) [G1002190; MR/X010791/1]. Additional support for E-Risk was provided by the US National Institute of Child Health and Human Development [HD077482] and the Jacobs Foundation. The Minnesota Twin Family Study was supported in part through grants from the National Institutes of Health R01 DA 042755, R01HG011035, R01 DA 054087, R01 DA 044283. The Swedish Twin Registry (STR) is managed by the Karolinska Institute and receives additional funding through the Swedish Research Council (2017-00641). Additional funding for STR comes from the Ragnar Söderberg Foundation (E9/11), and the Swedish Research Council (421-2013-1061). TwinLife is funded by grants from the German Research Foundation (DFG; project number: 220286500 and 428902522). SvS held fellowships from the Jacobs Foundation (2022-2027) and the Paris Institute of Advanced Study (2023-2024) during the writing of this manuscript. HLF was supported by the UK ESRC Centre for Society and Mental Health at King’s College London [ES/S012567/1]. The position of CP is funded by the DFG (funding number 428902552). OP, RA, and SO were supported by the Swedish Research Council (2019-00244; 2023-01343).
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Conceptualization: AS and SvS, Methodology: AS and MR, Formal analysis: AS, MR, AG, OP, and CKLP, Resources: RA, LA, HLF, AJF, CK, MM, MMN, SO, FMS, SV, JW, and SvS, Data curation: AS, MR, AG, EW, OP, CKLP, CM, and AA, Writing – Original draft: AS and SvS, Writing – Review & Editing: All authors, Visualization: AS, Supervision: RA, LA, HLF, AJF, CK, MM, MMN, SO, FMS, SV, JW, and SvS, Funding acquisition: RA, LA, HLF, AJF, CK, MM, MMN, SO, FMS, SV, and SvS, All authors approved the final version of the manuscript.
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Starr, A., Ruks, M., Giannelis, A. et al. Within- and between-family genetic effects on educational achievement vary across countries and ages. Mol Psychiatry (2025). https://doi.org/10.1038/s41380-025-03342-0
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DOI: https://doi.org/10.1038/s41380-025-03342-0


