Related Experiment Video

Updated: Oct 4, 2025

Author Spotlight: High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution
10:47

Author Spotlight: High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution

Published on: May 5, 2023

3.9K

The fate of damaged mitochondrial DNA in the cell

Siyang Liao1, Li Chen1, Zhiyin Song1

  • 1Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Frontier Science Center for Immunology and Metabolism, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, Hubei, China.

Biochimica Et Biophysica Acta. Molecular Cell Research
|February 8, 2022
PubMed

Insights

Damaged mitochondrial DNA (mtDNA) triggers cell repair and clearance pathways to maintain mitochondrial function and prevent disease. This review details mechanisms for removing damaged mtDNA and restoring cellular homeostasis.

Area of Science:

  • Cellular Biology
  • Mitochondrial Biology
  • Genetics

Background:

  • Mitochondria generate ATP via cellular respiration, utilizing mitochondrial DNA (mtDNA) for essential respiratory complex subunits.
  • Mitochondrial dysfunction arises from accumulated damaged mtDNA, leading to mitochondrial diseases.
  • Cells possess repair, degradation, clearance, and release pathways to manage damaged mtDNA.

Purpose of the Study:

  • To review current understanding of the fate of damaged mitochondrial DNA.
  • To focus on the pathways and mechanisms involved in removing damaged mtDNA.

Main Methods:

  • Literature review of cellular responses to mitochondrial DNA damage.
  • Analysis of pathways for mtDNA repair, degradation, clearance, and release.

Main Results:

  • Multiple cellular pathways are activated in response to mitochondrial DNA damage.
  • These pathways aim to restore mtDNA integrity and mitochondrial function.
  • Mechanisms for removing damaged mtDNA are crucial for maintaining cell homeostasis.

Conclusions:

  • Understanding damaged mtDNA fate is key to addressing mitochondrial dysfunction and disease.
  • Cellular mechanisms for removing damaged mtDNA are vital for maintaining mitochondrial quality.
  • Further research into these pathways can reveal therapeutic targets for mitochondrial disorders.
Keywords:
Mitochondria DNA (mtDNA)MitocytosisMitophagymtDNA release

More Related Videos

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model06:05

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model

Published on: March 9, 2022

3.9K
Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs08:15

Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs

Published on: August 15, 2025

403

Related Concept Videos

Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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...
8.2K
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...
32.0K
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
15.5K
Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
15.0K
DNA Damage can Stall the Cell Cycle02:37

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...
9.4K
Export of Mitochondrial and Chloroplast Genes02:19

Export of Mitochondrial and Chloroplast Genes

A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
3.8K