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Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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Updated: Jul 16, 2025

Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans
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The evolution of aging and lifespan.

Stacy Li1, Juan Manuel Vazquez2, Peter H Sudmant1

  • 1Department of Integrative Biology, University of California, Berkeley, CA, USA; Center for Computational Biology, University of California, Berkeley, CA. USA.

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|September 15, 2023
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Organism lifespan varies greatly due to evolution and genetics. Research explores how aging and lifespan evolve across different biological scales, from genes to populations.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Gerontology

Background:

  • Lifespan varies significantly across species, driven by evolutionary pressures and genetic factors.
  • Aging impacts disease susceptibility and mortality risk, influenced by age-specific selection.
  • Mutational processes in germline and somatic cells are linked to age and life history.

Purpose of the Study:

  • To review recent advances in understanding the evolution of aging and lifespan.
  • To explore aging and lifespan diversity at organismal, population, and cellular levels.
  • To identify key unanswered questions in the field.

Main Methods:

  • Review of current literature on aging and lifespan evolution.
  • Analysis of genetic and genomic data related to aging.
  • Integration of findings across different biological scales.

Main Results:

  • Phenotypic diversity in aging is shaped by evolutionary trajectories and genomic constraints.
  • Age-specific selection influences allele frequencies, affecting health and survival.
  • Mutational dynamics are age-dependent, contributing to genetic diversity.

Conclusions:

  • Understanding aging and lifespan requires a multi-scale approach, integrating evolutionary, population, and cellular perspectives.
  • Further research is needed to address outstanding questions regarding the evolution of aging and lifespan.