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Related Concept Videos

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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Cell Size01:22

Cell Size

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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
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DNA Damage Can Stall the Cell Cycle02:36

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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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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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Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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DNA Isolation01:34

DNA Isolation

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DNA from cells is required for many biotechnology and research applications, such as molecular cloning. To remove and purify DNA from cells, researchers use various methods of DNA extraction. While the specifics of different protocols may vary, some general concepts underlie the process of DNA extraction.
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Related Experiment Video

Updated: Jan 24, 2026

Far-Red Fluorescent Senescence-Associated β-Galactosidase Probe for Identification and Enrichment of Senescent Tumor Cells by Flow Cytometry
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Far-Red Fluorescent Senescence-Associated β-Galactosidase Probe for Identification and Enrichment of Senescent Tumor Cells by Flow Cytometry

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DNA Content, Cell Size, and Cell Senescence.

Reiner A Veitia1

  • 1Institut Jacques Monod, Université Paris Diderot, Paris, France; Université Paris-Diderot, Paris, France.

Trends in Biochemical Sciences
|June 5, 2019
PubMed
Summary

Oversized yeast cells show slower division and altered gene expression, similar to aging mammalian cells. Maintaining an optimal DNA content to cell volume ratio is key for cellular function.

Area of Science:

  • Cell Biology
  • Genomics
  • Proteomics

Background:

  • Cell size is a fundamental parameter influencing cellular behavior.
  • Aging in both yeast and mammalian cells involves complex molecular changes.

Purpose of the Study:

  • To investigate the effects of increased cell size on yeast cell properties.
  • To identify commonalities in cellular aging mechanisms between yeast and mammals.

Main Methods:

  • Analysis of oversized yeast cells.
  • Transcriptomic and proteomic profiling.
  • Comparative analysis with mammalian cell aging.

Main Results:

  • Oversized yeast cells exhibit significantly slower cell division rates.

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Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

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  • Increased cell volume leads to cytoplasmic dilution and altered gene expression.
  • Transcriptomic and proteomic profiles of oversized yeast cells show similarities to aging mammalian cells.

    • Conclusions:

    • Cell size is a critical determinant of cellular function and division rate.
    • The DNA content to cell volume ratio is crucial for maintaining optimal cellular function.
    • Yeast serves as a valuable model for understanding aging processes in higher eukaryotes.