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Is aging programed?

Steven N Austad1

  • 1Department of Cellular & Structural Biology, University of Texas Health Science Center, STCBM Bldg., Room 3.100, Barshop Center for Longevity & Aging Studies, 15355 Lambda Drive, San Antonio, TX 78245, USA. austad@uthscsa.edu

Aging Cell
|September 24, 2004
PubMed
Summary
This summary is machine-generated.

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Aging is decay, not a programmed process, unlike development. Natural selection shapes adult phenotypes, not senescence, highlighting the absence of evolutionary design in aging. This distinction is crucial for understanding aging research.

Area of Science:

  • Evolutionary biology
  • Gerontology
  • Developmental biology

Background:

  • Development and morphogenesis are viewed as programmed processes driven by natural selection to achieve specific adult phenotypes.
  • Aging, conversely, is generally considered a process of decay rather than a designed outcome, except in specific cases like Pacific salmon.

Purpose of the Study:

  • To differentiate between programmed development and non-programmed senescence.
  • To emphasize that natural selection acts on adult phenotypes, not on the process of aging itself.
  • To guide research by focusing on the phenotypic performance of adults and potential side-effects of aging interventions.

Main Methods:

  • Comparative analysis of aging processes in different organisms (e.g., Pacific salmon vs. humans/mice).

Related Experiment Videos

  • Conceptual distinction between evolutionary "design" and "decay" in biological processes.

    • Main Results:

    • Senescence is characterized by decay due to the absence of natural selection's direct influence, unlike programmed development.
    • The lack of stereotyped aging pathways in most organisms (humans, mice) contrasts with the predictable death sequence in organisms like salmon.
    • Understanding this distinction is key to focusing on adult phenotypic performance and potential pleiotropic effects of interventions.

    Conclusions:

    • Aging is a consequence of evolutionary neglect (decay), not a selected trait.
    • Focusing on adult phenotype is essential for understanding natural selection's role and the implications of aging research.
    • Awareness of non-programmed senescence is vital for evaluating treatments that aim to retard aging.