Screening Human Embryos for Polygenic Traits Has Limited Utility
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Abstract
The increasing proportion of variance in human complex traits explained by polygenic scores, along with progress in preimplantation genetic diagnosis, suggests the possibility of screening embryos for traits such as height or cognitive ability. However, the expected outcomes of embryo screening are unclear, which undermines discussion of associated ethical concerns. Here, we use theory, simulations, and real data to evaluate the potential gain of embryo screening, defined as the difference in trait value between the top-scoring embryo and the average embryo. The gain increases very slowly with the number of embryos but more rapidly with the variance explained by the score. Given current technology, the average gain due to screening would be ≈2.5 cm for height and ≈2.5 IQ points for cognitive ability. These mean values are accompanied by wide prediction intervals, and indeed, in large nuclear families, the majority of children top-scoring for height are not the tallest.
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Our results do not support any immediate medical or clinical applications, such as polygenic prediction in direct-to-consumer services.
“our results do not support any immediate medical or clinical applications, such as polygenic prediction in direct-to-consumer services49,50.”
From Shared genetic architectures of educational attainment in East Asian and European populations (2024) · cites this paper as [50]
The Discussion says limitations in polygenic-score accuracy and other constraints reduce the utility of embryo screening. It does not extend that conclusion to all immediate medical or clinical applications, or evaluate polygenic prediction in direct-to-consumer services generally; its mention of consumers concerns embryo selection specifically. The claim therefore applies the paper's narrower finding too broadly. (LLM, conf=0.83)
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- Authors
- Karavani, E., Zuk, O., Zeevi, D., Barzilai, N., Stefanis, N. C., Hatzimanolis, A., Smyrnis, N., Avramopoulos, D., Kruglyak, L., Atzmon, G., Lam, M., Lencz, T., & Carmi, S.
- Affiliations
- Hebrew University of Jerusalem (IL)
- University of California, Los Angeles (US)
- Albert Einstein College of Medicine (US)
- National and Kapodistrian University of Athens (GR)
- Johns Hopkins University (US)
- Howard Hughes Medical Institute (US)
- Broad Institute (US)
- Feinstein Institute for Medical Research (US)
- Corresponding author
- Lencz, Todd
- Carmi, Shai
- ORCID
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2019-11
- Volume
- 179
- Issue
- 6
- Pages
- 1424-1435.e8
- ISSN
- 0092-8674 (ISSN-L)
- PMC
- PMC6957074
- OpenAlex
- W2990673704
- Cited by
- 111
- References
- 129
- Citations by year
- 2026: 15 · 2025: 13 · 2024: 15 · 2023: 18 · 2022: 22 · 2021: 18 · 2020: 9 · 2019: 1
- FWCI
- 13.00
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell (publishedVersion)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health
- James S. McDonnell Foundation
- Abisch-Frenkel-Stiftung
- Topics
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Prenatal Screening and Diagnostics
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Assisted Reproductive Technology and Twin Pregnancy
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
- Keywords
- embryo screening, polygenic risk score, preimplantation genetic diagnosis, complex traits, height, cognitive ability, prediction intervals, prediction accuracy, reproductive ethics
- MeSH terms
- Adult, Embryo, Mammalian, Family, Genetic Testing, Humans, Phenotype, Multifactorial Inheritance, Genome-Wide Association Study
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