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Related Concept Videos

Aging01:26

Aging

41
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...
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Replicative Cell Senescence02:15

Replicative Cell Senescence

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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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Molecular Factors Affecting Cell Division01:27

Molecular Factors Affecting Cell Division

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Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
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Cells Coordinate Growth and Proliferation02:36

Cells Coordinate Growth and Proliferation

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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
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The Cell Cycle Control System01:28

The Cell Cycle Control System

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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and...
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DNA Damage can Stall the Cell Cycle02:37

DNA Damage can Stall the Cell Cycle

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Updated: Jun 23, 2025

A Suppressor Screen for the Characterization of Genetic Links Regulating Chronological Lifespan in Saccharomyces cerevisiae
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Mammal Aging as a Programmed Life Cycle Function - Resolving the Cause and Effect Conundrum.

Theodore C Goldsmith1

  • 1Azinet LLC, 821 Boatswain Way, Annapolis, Maryland, 21401, USA.

Advanced Biology
|June 16, 2024
PubMed
Summary
This summary is machine-generated.

Aging is an evolved trait, with complex biological mechanisms controlling lifespan. Discoveries support programmed aging, offering evolutionary advantages and adaptability for species survival.

Keywords:
biologyevolutionevolvabilitygeneticsgerontologylifespansenescence

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Gerontology

Background:

  • Lifespan variation suggests aging is an evolved trait.
  • Programmed aging was once considered theoretically impossible.
  • Genetics and selective breeding provide evidence for evolved aging.

Purpose of the Study:

  • To explore the evolutionary basis of aging.
  • To investigate the role of programmed aging mechanisms.
  • To examine the implications of genetics on aging theories.

Main Methods:

  • Review of genetics discoveries.
  • Analysis of selective breeding results.
  • Examination of evidence supporting evolved aging theories.

Main Results:

  • Aging is supported as an evolved trait with complex biological control mechanisms.
  • Programmed aging offers evolutionary advantages and species adaptability.
  • Genetics discoveries confirm digital information transmission in inheritance, impacting evolution.

Conclusions:

  • Aging is an evolved, programmed trait that enhances species adaptability.
  • Genetics provides strong support for programmed aging theories.
  • The evolvability concept is supported by aging as a design feature for evolution.