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Ageing is not linear; the Smurf phenotype reveals two distinct phases of biological decline and mortality risk across species. This discovery offers a new framework for understanding ageing and longevity.

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Area of Science:

  • Gerontology and Evolutionary Biology
  • Molecular and Developmental Biology

Background:

  • Human and model organism ageing is typically viewed as a continuous decline in biological function and increasing mortality.
  • Existing definitions of ageing are challenged by the diverse ageing patterns observed across species.
  • The concept of 'hallmarks of ageing' identifies common biological processes associated with ageing.

Purpose of the Study:

  • To introduce and explore a novel framework for understanding ageing as a non-linear process.
  • To challenge conventional definitions of ageing and its evolutionary trajectory.
  • To highlight the significance of the 'Smurf' phenotype in identifying distinct ageing phases.

Main Methods:

  • Review of existing literature on ageing, frailty, and molecular clocks.
  • Analysis of the 'Smurf' phenotype in *Drosophila* and its validation in other model organisms (nematodes, zebrafish, mice).
  • Development of a mathematical framework for longevity trends based on experimentally measurable parameters.

Main Results:

  • The 'Smurf' phenotype, characterized by age-linked intestinal permeability, consistently predicts mortality across diverse species.
  • This phenotype reveals that ageing is not a continuous decline but comprises two distinct, discernible phases.
  • A new mathematical model quantifies longevity trends based on three key parameters.

Conclusions:

  • The Smurf phenotype provides a powerful tool to distinguish between chronological and biological age, and to identify distinct ageing phases.
  • This research proposes a paradigm shift in ageing research, moving from a linear to a two-phase model.
  • The findings offer new perspectives on the evolution of ageing and potential interventions to modulate the ageing process.