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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...
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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.
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Translocation of Proteins into the Mitochondria

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Translation Produces the Building Blocks of Life
Translation01:31

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Lesson: Translation
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Updated: Jun 27, 2026

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry
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Published on: November 23, 2011

Mitochondrial DNA damage in iron overload.

Xueshan Gao1, Jian Li Campian, Mingwei Qian

  • 1Department of Oncology, University of Linköping, Linköping 58185, Sweden.

The Journal of Biological Chemistry
|December 20, 2008
PubMed
Summary
This summary is machine-generated.

Chronic iron overload causes cumulative damage to mitochondrial DNA (mtDNA) through iron-catalyzed oxidation. This damage impairs cellular respiration and contributes to organ dysfunction in iron overload disorders.

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Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry
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09:40

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Published on: January 19, 2017

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pathophysiology

Background:

  • Chronic iron overload insidiously damages organs like the heart and liver.
  • Organ damage progression suggests a biological memory, possibly linked to cumulative oxidative stress.
  • Iron-catalyzed oxidation of biomolecules is usually repaired, but mtDNA damage may persist.

Purpose of the Study:

  • To investigate the hypothesis that cumulative iron-catalyzed oxidant damage to mitochondrial DNA (mtDNA) occurs in iron overload.
  • To explore the role of mtDNA damage in the cardiac dysfunction associated with iron overload.
  • To elucidate the mechanism of iron-induced cellular damage in cardiac myocytes.

Main Methods:

  • Cultured H9c2 rat cardiac myocytes were exposed to high iron concentrations for 3-5 days.
  • Real-time PCR was used to assess the integrity of mtDNA by examining PCR product lengths.
  • Mitochondrial function was evaluated by measuring cellular respiration and mRNA levels for electron transport chain subunits.
  • Wild-type and rho(0) cells (lacking mtDNA) were compared to assess the role of mitochondria in iron toxicity.

Main Results:

  • High iron exposure led to diminished amounts of near full-length mtDNA (15.9-kb PCR product) in cardiac myocytes.
  • Cellular respiration declined with mtDNA damage, and mtDNA-encoded mRNAs decreased.
  • Elevated iron increased reactive oxygen species production, cytostasis, and cell death in wild-type cells but not in rho(0) cells.
  • Nuclear DNA integrity (16.1-kb PCR product) remained unchanged, indicating specific mtDNA damage.

Conclusions:

  • Long-term organ damage in iron overload involves iron-mitochondrial reactive oxygen species interactions.
  • Cumulative damage to mtDNA impairs the synthesis of respiratory chain subunits, leading to respiratory dysfunction.
  • Mitochondrial dysfunction driven by mtDNA damage is a key mechanism in the pathogenesis of iron overload disorders.