Spaceflight may not just accelerate aging—it could be a stress test for the body’s biological resilience, with DNA methylation changes rebounding faster than expected in astronauts.
Four astronauts on the nine-day Axiom-2 mission exhibited rapid DNA methylation changes during spaceflight, with epigenetic age shifts partially reversing post-landing.
Researchers used 32 epigenetic clocks—including chronological-age predictors, mortality-linked models, and immune-focused clocks—to measure biological age. Younger astronauts showed epigenetic ages below pre-flight levels within 24 hours of landing, suggesting biological elasticity.
Immune cell dynamics, particularly regulatory T cells and naïve CD4 T cells, accounted for much of the in-flight epigenetic acceleration. David Furman said:
"The findings suggest that spaceflight induces rapid, yet reversible, epigenetic changes that are partially distinct from cell shifts. This positions spaceflight as a platform to study aging mechanisms and test geroprotective interventions."
The study’s limitations include a small sample size (four astronauts), potential confounding factors like diet and sleep, and the inability to prove causality. Researchers propose spaceflight as a 'human aging model' by compressing stressors into a measurable window.
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