Researchers Linked Rare Genetic Variants to Extreme Traits
A May 2026 study challenges the polygenic model for human traits by identifying high-effect rare variants.
Updated on Oct. 4, 2026 in Life Sciences
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Researchers published findings in Nature on May 27, 2026, indicating that rare genetic variants often drive extreme measurements in human physical traits. The study examined 74 quantitative traits using data from the UK Biobank and the All of Us Research Program.
Why it matters
These results challenge the dominant polygenic model, which assumes common traits are shaped solely by many small genetic contributions. The discovery highlights that natural selection actively suppresses variants with large biological effects to protect reproductive success.
The study analyzed 74 quantitative human traits to confirm that individuals at phenotypic extremes frequently harbor rare variants with outsized biological effects. This stands in contrast to the prior standard of polygenic risk scoring, which focuses on common, small-effect genetic markers.
The players
Icahn School of Medicine at Mount Sinai
An academic medical center known for genomics and bioinformatics research that led the analysis.
UK Biobank
A large-scale biomedical database containing genetic and health information from half a million UK participants.
All of Us Research Program
A US-based precision medicine initiative gathering health data from a diverse cohort of over one million participants.
The details
Researchers at the Icahn School of Medicine at Mount Sinai developed two statistical approaches to test for these rare signals. They compared trait values between siblings and across populations to isolate patterns that standard models miss. Rare variants — DNA sequences that occur in less than 1% of the population — are typically kept at low frequencies because they can negatively impact survival, yet this work confirms they remain critical drivers of biological extremes.
Timeline
May 27, 2026: The research was published in Nature.
October 4, 2026: Article publication date.
The Tech Race
The field of genomics has long relied on the polygenic model to explain physical traits through numerous common genetic markers. By surfacing the importance of rare, high-effect variants, this research necessitates a shift in how institutions like the Icahn School of Medicine at Mount Sinai approach predictive genetic modeling.
While these findings currently sit at the research stage, they will eventually influence how clinicians interpret genetic data for patients with extreme physiological measurements. Future applications will focus on identifying the specific biological pathways these rare variants trigger to improve diagnostic precision.
The takeaway
This study shifts the focus of genetic research from common variations to rare, high-effect drivers of physical traits. Watch for future research papers that attempt to map these specific variants to known disease pathways to validate these findings.
Further reading
For broader updates on the latest findings in genomics, see our coverage in Life Sciences.
Source note: This article includes information reported by SciTechDaily.
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