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The evolution of mammalian aging.

João Pedro de Magalhães1, Olivier Toussaint

  • 1Department of Biology, Unit of Cellular Biochemistry and Biology, University of Namur (FUNDP), Rue de Bruxelles 61, 5000 Namur, Belgium. joao.magalhaes@fundp.ac.be

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Mammalian aging, including human aging, may stem from a common evolutionary origin, unlike many reptiles and amphibians. This suggests a shared fundamental cause for aging across most mammal species.

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Area of Science:

  • Evolutionary biology
  • Gerontology
  • Comparative physiology

Background:

  • Significant differences exist in aging incidence between mammals and their ectothermic ancestors (reptiles, amphibians).
  • Mammals exhibit a consistent aging phenotype, contrasting with the lack of observable aging in many amphibians and reptiles.
  • Similarities in mammalian aging suggest a shared evolutionary origin for this biological process.

Purpose of the Study:

  • To propose and explore the hypothesis that mammalian aging evolved concurrently with the emergence of modern mammals.
  • To investigate the potential for a common fundamental cause underlying aging in most mammalian species, including humans.
  • To outline experimental approaches for testing theories on the evolution of aging and mapping its causes in mammals.

Main Methods:

  • Comparative analysis of aging phenotypes across mammalian and non-mammalian vertebrate species.
  • Hypothesis formulation based on observed similarities in mammalian aging and differences with ancestral groups.
  • Theoretical prediction of experimental methodologies for validating evolutionary aging hypotheses.

Main Results:

  • Mammals universally display a defined aging phenotype, while many reptiles and amphibians do not.
  • The conserved nature of mammalian aging suggests a shared evolutionary pathway.
  • A hypothesis is presented that mammalian aging is intrinsically linked to mammalian ancestry.

Conclusions:

  • Mammalian aging may be a unique evolutionary phenomenon originating with the mammalian lineage.
  • The fundamental cause of human aging is likely shared across most mammalian species.
  • Further experimental research is needed to confirm the evolutionary origins and mechanisms of mammalian aging.