Genetic Review Confirms Selection Shadow in 100,000s, Linking Aging to Late-Life Disease
Updated
Updated · ScienceAlert · Jun 28
Genetic Review Confirms Selection Shadow in 100,000s, Linking Aging to Late-Life Disease
1 articles · Updated · ScienceAlert · Jun 28
Summary
Hundreds of thousands of genetic records reviewed by Handan Melike Dönertaş and Linda Partridge support the “selection shadow” theory, showing natural selection weakens after reproduction and helps explain age-related health decline.
That mechanism leaves late-acting harmful mutations less exposed to evolutionary pressure and preserves genes that boost early-life reproduction even when they raise risks such as cancer in old age.
The Nature Reviews Genetics paper argues this evolutionary framework can guide interventions toward ancient biological pathways that stay active later in life and contribute to disease.
Comparisons with long-lived species such as mole rats suggest biology may partly work around that late-life evolutionary gap, offering clues for compressing morbidity rather than simply extending lifespan.
Long-lived animals defy aging by repairing their DNA. Can we borrow their genetic secrets to extend our own health?
Science now suggests aging is an evolutionary side effect. Does this mean we are on the verge of 'curing' old age?
Our genes are built for a sprint, not a marathon. Can lifestyle choices truly retrain our bodies for the long run?
The Selection Shadow Confirmed: How Evolution Drives Aging and Late-Life Disease in Modern Humans
Overview
A major 2026 review in Nature Reviews Genetics confirmed the 'selection shadow' as a key evolutionary reason why aging and late-life diseases are so common. The review shows that natural selection mainly shapes our biology for early life, so its influence fades after reproduction. As a result, harmful genes that only cause problems in old age are not removed by evolution, since their effects appear after individuals have already had children. This explains why aging and age-related diseases are widespread, especially now that people live much longer than in the past.