Related Experiment Video

Updated: Jul 19, 2026

Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models
08:48

Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models

Published on: June 30, 2023

DNA repair, mitochondria, and neurodegeneration

L Weissman1, N C de Souza-Pinto, T Stevnsner

  • 1Laboratory of Molecular Gerontology, National Institute on Aging, National Institute on Aging, IRP, National Institutes of Health, 5600 Nathan Shock Drive, Baltimore, MD 21224, USA.

Neuroscience
|November 10, 2006
PubMed

Insights

DNA damage accumulates in aging brain cells. Base excision repair (BER) is crucial for neuronal survival and function, especially mitochondrial DNA repair, impacting neurodegeneration.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Post-mitotic cells like neurons cannot divide, making accumulated DNA damage particularly harmful.
  • DNA damage responses are critical for maintaining neuronal survival and function.
  • Aging and neurodegenerative diseases are associated with increased DNA damage.

Purpose of the Study:

  • To review the current literature on DNA damage responses in the mammalian central nervous system (CNS) concerning aging and neurodegeneration.
  • To highlight the role of Base Excision Repair (BER) in repairing DNA damage within neuronal cells.
  • To emphasize the significance of mitochondrial DNA repair in neuronal health.

Main Methods:

  • Literature review of experimental evidence from neuronal cell cultures, human brain tissue, and animal models.
  • Characterization of Base Excision Repair (BER) enzymes in mammalian mitochondria.
  • Analysis of BER activity changes with age in mitochondria from different brain regions.

Main Results:

  • The Base Excision Repair (BER) pathway is active in both nuclear and mitochondrial compartments of the brain.
  • Mitochondrial DNA repair is essential for neuronal cells due to their reliance on mitochondrial function for energy.
  • BER enzyme activity in mitochondria changes with age across different brain regions.

Conclusions:

  • Mitochondrial DNA damage response is a key factor in the aging process of the brain.
  • Dysfunctional mitochondrial DNA repair contributes to the pathogenesis of neurodegenerative diseases.
  • Targeting BER pathways may offer therapeutic strategies for age-related neurological disorders.

More Related Videos

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry08:19

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry

Published on: May 5, 2022

Related Concept Videos

Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

Overview
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

Overview
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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...