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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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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans
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Mitochondrial DNA Damage Does Not Determine C. elegans Lifespan.

Li Fang Ng1, Li Theng Ng1,2,3, Michiel van Breugel4

  • 1Ageing Research Laboratory, Science Division, Yale-NUS College, Singapore, Singapore.

Frontiers in Genetics
|April 30, 2019
PubMed
Summary

Oxidative damage to mitochondrial DNA (mtDNA) accumulates with age in C. elegans, but this damage does not directly control lifespan. Studies show complex relationships between mtDNA damage and longevity, even with external damage induction.

Keywords:
DNA damageaginghealthspanhormesislifespanmitochondrial DNAquantitative PCRradiation

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Area of Science:

  • Gerontology and Molecular Biology
  • Mitochondrial Medicine
  • Genetics and Aging Research

Background:

  • The mitochondrial free radical theory of aging (mFRTA) posits that accumulated oxidative damage within mitochondria drives aging.
  • Mitochondrial DNA (mtDNA) damage is a key focus, yet quantitative data linking it to longevity is limited due to assay challenges.
  • Understanding mtDNA damage's role requires reliable measurement methods and investigation across different aging models.

Purpose of the Study:

  • To adapt and apply a quantitative real-time PCR (qRT-PCR) assay for detecting sequence-specific mtDNA damage in *C. elegans*.
  • To investigate the relationship between mtDNA damage levels and lifespan in *C. elegans*, comparing young/old, wild-type/mutant strains, and radiation-exposed animals.
  • To explore how exogenous damage (UV, gamma radiation) impacts mtDNA damage, lifespan, and healthspan in nematodes.

Main Methods:

  • Developed and validated a quantitative real-time polymerase chain reaction (qRT-PCR) assay for *C. elegans* mtDNA damage.
  • Compared mtDNA damage levels in young vs. old *C. elegans*, wild-type vs. long-lived mutants, and ROS-modified strains.
  • Exposed nematodes to UV and gamma radiation to induce exogenous mtDNA damage and assessed subsequent lifespan and healthspan.

Main Results:

  • Confirmed age-dependent increases in *C. elegans* mtDNA damage, but found no direct correlation with lifespan across different strains.
  • Exogenous gamma radiation elevated mtDNA damage without shortening lifespan; high-dose UV radiation reduced lifespan.
  • Intermediate UV radiation doses induced higher mtDNA damage yet resulted in hormetic (beneficial) effects on lifespan and healthspan.

Conclusions:

  • The level of mtDNA damage does not appear to be the sole determinant of lifespan in *C. elegans* within a broad physiological range.
  • Complex interactions exist between mtDNA damage, radiation exposure, and organismal aging, suggesting other factors modulate longevity.
  • The study highlights the need for nuanced understanding of oxidative stress and damage in aging, moving beyond simple linear relationships.