Researchers Map Genetic Effects on Circadian Rhythms
A new study identifies 167 genetic loci that influence rhythmic gene expression across human tissues.
Updated on Oct. 26, 2026 in Life Sciences
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Scientists have uncovered 167 circadian expression quantitative trait loci, providing new insight into how genetics regulate biological rhythms. By analyzing GTEx version 10 gene expression data, researchers found that these genetic factors impact rhythmicity in nearly every human tissue studied.
Why it matters
Previous research often overlooked the timing of biological samples, missing critical genetic effects on rhythm parameters. This discovery bridges that gap, linking specific genetic variations to diverse human phenotypes like chronotype and blood biochemistry.
The study identified 167 circadian expression QTLs and 54 lead signals across 51 genes. These variants were detected using a cosinor-based joint genotype-by-rhythm interaction framework, with researchers using donor-inferred phase as a proxy for circadian time.
The details
Researchers found that most of these identified genetic variants primarily alter the oscillation amplitude of gene expression. A phenome-wide association study successfully linked 34 of these loci to 100 distinct phenotypes, including adiposity and various blood cell counts.
Timeline
The findings were published on October 26, 2026.
The Big Picture
This study significantly advances the goals of the Genotype-Tissue Expression (GTEx) project by expanding the scope of genomic mapping to include time-dependent rhythmic expression. It moves the field beyond static gene mapping, establishing a new framework for understanding the temporal dynamics of human biology.
This research provides a foundational understanding of how our internal clocks are genetically hardwired, potentially leading to future personalized medicine based on individual circadian profiles. By linking genetic variants to health outcomes like adiposity and blood biochemistry, it offers a pathway to better managing metabolism and sleep-related health.
The takeaway
Understanding how your genes influence your biological rhythm could eventually help tailor medical treatments to your specific internal clock. This study highlights the importance of accounting for timing when analyzing how genetic variations impact overall human health.
Further reading
For more research on genomic discoveries, visit our Life Sciences section.
Source note: This article includes information reported by Biorxiv.
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