Targeted metabolomic profiling of five marine bivalve species spanning lifespans of roughly 30 to over 500 years identified a consistent metabolic phenotype in the longest-lived animals: globally reduced free amino acid pools, lower fumarate and malate, elevated succinate-to-fumarate ratios, and diminished reliance on pyruvate-derived anaerobic pathways. Lifespan was the dominant axis of metabolomic variation across species. The pattern indicates a reorganization of mitochondrial intermediary metabolism rather than a generalized slowing of metabolic rate.
Key Points
- Lifespan dominated metabolomic variation across five bivalve species studied
- Long-lived species showed globally reduced free amino acid pools
- Elevated succinate-to-fumarate ratios marked exceptional longevity, not metabolic suppression
Longevity Analysis
Exceptional lifespan in these animals tracks with how mitochondrial carbon flux is organized, not with how slowly it runs — reframing the long-standing assumption that reduced metabolic throughput extends life. Lower amino acid availability alongside altered TCA cycle intermediates points toward selective resource allocation favoring repair and maintenance over rapid turnover, a pattern that parallels nutrient-sensing and protein-restriction signals already studied in mammals. For human application, succinate and fumarate ratios may prove more informative as readouts of mitochondrial organization than bulk measures of energy output, and the amino acid findings add comparative weight to the question of how protein intake and timing shape the machinery of cellular renewal.
Original published by Wiley Aging Cell, by Pauline Bertrand, Clément J. L. Chevret, Enrique Rodríguez, Hélène Lemieux, Pierre U. Blier .