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Related Concept Videos

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,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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...
Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
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The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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...

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

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Mitochondrial DNA alterations and reduced mitochondrial function in aging.

Sadie L Hebert1, Ian R Lanza, K Sreekumaran Nair

  • 1Endocrine Research Unit, Mayo Clinic, Rochester, MN 55905, USA.

Mechanisms of Ageing and Development
|March 24, 2010
PubMed
Summary
This summary is machine-generated.

Oxidative damage to mitochondrial DNA (mtDNA) accumulates with age, potentially impairing mtDNA replication and protein function. This review explores age-related mtDNA changes and their contribution to declining mitochondrial function.

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Last Updated: Jun 14, 2026

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

  • Gerontology
  • Mitochondrial Biology
  • Molecular Biology

Background:

  • Mitochondrial DNA (mtDNA) integrity is crucial for cellular energy production.
  • Oxidative stress is a known factor in the aging process.
  • Accumulated damage to mtDNA may underlie age-related functional decline.

Purpose of the Study:

  • To review age-associated alterations in mitochondrial DNA.
  • To discuss the impact of these alterations on mitochondrial function.
  • To explore the role of mtDNA damage in aging.

Main Methods:

  • Literature review of studies on aging, oxidative stress, and mitochondrial DNA.
  • Analysis of research on mtDNA replication and transcription.
  • Synthesis of findings on age-related changes in mitochondrial protein expression and function.

Main Results:

  • Oxidative damage to mtDNA increases significantly with aging.
  • This damage can disrupt mtDNA replication and transcription processes.
  • Altered mtDNA can lead to changes in mitochondrial protein levels and functionality.

Conclusions:

  • Age-related mtDNA alterations are a significant factor in the decline of mitochondrial function.
  • Understanding these changes is key to addressing age-related mitochondrial dysfunction.
  • mtDNA damage is a potential contributor to the aging phenotype.