Digest: Diet links cryptic genetic variation to growth-aging trade-offs.
Abstract
Antagonistic trade-offs between early-life fitness and somatic maintenance are predicted to maintain variation in longevity, yet empirical support is scarce. Shephard et al. (2026) experimentally tested whether such trade-offs are concealed under typical developmental conditions using Mexican spadefoot tadpoles (Spea multiplicata) reared on typical or atypical diets. The atypical diet revealed cryptic genetic variation in larval growth and a significant negative genetic correlation with telomere length, indicating a diet-dependent trade-off in somatic maintenance.
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Research summary
The paper claims that diet can reveal cryptic genetic variation affecting growth and telomere length in tadpoles, indicating a trade-off in somatic maintenance. This research is relevant as it explores the genetic mechanisms underlying longevity and aging trade-offs, contributing to our understanding of factors that influence lifespan and aging processes.
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