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Related Concept Videos

Aging01:26

Aging

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.
Cellular Clock Theory
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...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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...
Replicative Cell Senescence02:15

Replicative Cell Senescence

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 the telomeric...
Replicative Cell Senescence02:15

Replicative Cell Senescence

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 the telomeric...
Natural Selection and Adaptation01:15

Natural Selection and Adaptation

Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
Beyond physical adaptations, psychological...
Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
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Related Experiment Video

Updated: Jun 21, 2026

A Suppressor Screen for the Characterization of Genetic Links Regulating Chronological Lifespan in Saccharomyces cerevisiae
10:39

A Suppressor Screen for the Characterization of Genetic Links Regulating Chronological Lifespan in Saccharomyces cerevisiae

Published on: September 17, 2020

Why we age - Integrating error, program, and selective pressure.

Wolfgang Wagner1

  • 1Institute for Stem Cell Biology, RWTH Aachen University Medical School, Aachen 52074, Germany; Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University Medical Faculty, Aachen 52074, Germany; Center for Integrated Oncology Aachen Bonn Cologne Düsseldorf (CIO ABCD), Aachen 52074, Germany.

Ageing Research Reviews
|June 19, 2026
PubMed
Summary
This summary is machine-generated.

Aging results from a regulated modulation of defect accumulation and epigenetic drift, not solely random damage or a strict genetic program. This process may offer species-level adaptive benefits.

Keywords:
DevelopmentEpigenetic clocksEvolutionNetworkProgramSpecies

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Studying Age-dependent Genomic Instability using the S. cerevisiae Chronological Lifespan Model
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Last Updated: Jun 21, 2026

A Suppressor Screen for the Characterization of Genetic Links Regulating Chronological Lifespan in Saccharomyces cerevisiae
10:39

A Suppressor Screen for the Characterization of Genetic Links Regulating Chronological Lifespan in Saccharomyces cerevisiae

Published on: September 17, 2020

Studying Age-dependent Genomic Instability using the S. cerevisiae Chronological Lifespan Model
08:46

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Combining Magnetic Sorting of Mother Cells and Fluctuation Tests to Analyze Genome Instability During Mitotic Cell Aging in Saccharomyces cerevisiae
11:08

Combining Magnetic Sorting of Mother Cells and Fluctuation Tests to Analyze Genome Instability During Mitotic Cell Aging in Saccharomyces cerevisiae

Published on: October 16, 2014

Area of Science:

  • Gerontology
  • Epigenetics
  • Evolutionary Biology

Background:

  • Theories of aging debate whether it stems from molecular damage or programmed processes.
  • Understanding aging's origins is crucial for conceptualizing the aging process.
  • The potential adaptive benefits of aging at the species level are debated.

Purpose of the Study:

  • To review the current understanding of aging mechanisms.
  • To explore the role of epigenetic changes in aging.
  • To propose a novel perspective on aging as a regulated modulation of defect accumulation.

Main Methods:

  • Review of existing literature on aging theories.
  • Analysis of age-associated DNA methylation changes.
  • Discussion of epigenetic clocks and their stochastic components.

Main Results:

  • Age-associated DNA methylation changes are linked to developmental genes, suggesting a programmed component.
  • Epigenetic modifications' functional relevance in aging is not yet definitively proven.
  • Epigenetic clocks display significant stochasticity, similar to developmental epigenetics.

Conclusions:

  • Aging is best understood not as purely random damage or a fixed program, but as regulated modulation.
  • This modulation involves acquiring defects and epigenetic drift, potentially via network feedback.
  • Aging may confer ultimate benefits at the species level, despite individual decline.