Cellular senescence and DNA repair

Zhenkun Lou1, Junjie Chen

  • 1Division of Oncology Research, Mayo Clinic, Rochester, MN 55905, USA.

Insights

Cellular senescence, a model for aging, is linked to DNA damage. This review explores how DNA repair defects contribute to cellular senescence and aging.

Area of Science:

  • Gerontology and Molecular Biology
  • Cellular Biology and Aging Research

Background:

  • Aging is characterized by functional decline and mortality.
  • Cellular senescence serves as a key cellular model for studying the aging process.
  • Understanding cellular senescence has significant implications for human health and longevity.

Purpose of the Study:

  • To review the relationship between DNA damage and cellular senescence.
  • To elucidate the role of DNA repair mechanisms in cellular senescence.
  • To discuss the implications of DNA repair defects in aging.

Main Methods:

  • Literature review of studies on cellular senescence and aging.
  • Analysis of the DNA damage response pathway in senescence.
  • Synthesis of findings linking DNA repair to senescence.

Main Results:

  • Cellular senescence can be triggered by various stressors, including DNA damage.
  • Telomere shortening and DNA damage-induced senescence share common pathways.
  • DNA damage response pathways are central to the induction of cellular senescence.

Conclusions:

  • DNA repair defects are implicated in the development of cellular senescence.
  • Defective DNA repair may accelerate aging processes.
  • Targeting DNA repair pathways could offer strategies for mitigating age-related decline.

Related Concept Videos

Overview of DNA Repair02:25

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Overview of DNA Repair02:25

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

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...
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

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...
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...