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Mitochondrial DNA Damage: Prevalence, Biological Consequence, and Emerging Pathways

Linlin Zhao1, Philip Sumberaz1

  • 1Department of Chemistry and Environmental Toxicology Graduate Program, University of California, Riverside, Riverside, California 92521, United States.

Chemical Research in Toxicology
|June 4, 2020
PubMed

Insights

Mitochondrial DNA (mtDNA) damage is prevalent and impacts cell function, disease, and aging. Cells possess repair, degradation, and dynamics pathways to manage mtDNA damage, influencing mutagenesis and immunity.

Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Mitochondria are crucial for cellular functions, including energy production and metabolism.
  • Mitochondrial dysfunction is linked to over 200 disorders and contributes to aging and disease.
  • Mitochondrial DNA (mtDNA) encodes essential oxidative phosphorylation components, and its integrity is vital.

Purpose of the Study:

  • To discuss the prevalence of mitochondrial DNA damage.
  • To summarize cellular pathways for coping with mitochondrial DNA damage.
  • To review the roles of mitochondrial DNA damage in mutagenesis and immune responses.

Main Methods:

  • Comparative analysis of lesion abundance in mitochondrial DNA (mtDNA) versus nuclear DNA (nDNA).
  • Review of current knowledge on biological pathways involved in managing mtDNA damage.
  • Examination of emerging roles of mtDNA damage in cellular processes.

Main Results:

  • Mitochondrial DNA (mtDNA) is a significant target for genotoxic agents.
  • Cellular responses include mtDNA repair, degradation, and modulation of mitochondrial dynamics (fission/fusion).
  • mtDNA damage contributes to mutagenesis and influences immune system activation.

Conclusions:

  • Maintaining mitochondrial DNA (mtDNA) integrity is critical for cellular health.
  • Cellular mechanisms to cope with mtDNA damage are essential for preventing disease.
  • Understanding mtDNA damage pathways offers insights into aging, disease, and immune signaling.

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