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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,...
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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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,...
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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-deficient models and aging.

Abdullah Olgun1, Serif Akman

  • 1Department of Biochemistry and Clinical Biochemistry, Gülhane School of Medicine, 06018 Etlik, Ankara, Turkey. aolgun@yahoo.com

Annals of the New York Academy of Sciences
|April 27, 2007
PubMed
Summary

Mitochondrial DNA (mtDNA) defects impact aging and disease. Ethidium bromide (EB) creates mtDNA-deficient models, but careful timing is crucial for organismal studies, especially in C. elegans longevity research.

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Area of Science:

  • Cellular and Molecular Biology
  • Genetics
  • Aging Research

Background:

  • Human mitochondrial DNA (mtDNA) encodes key oxidative phosphorylation (OXPHOS) subunits, crucial for cellular energy production.
  • mtDNA is highly susceptible to oxidative damage, and its defects are implicated in numerous pathologies, including aging.
  • Existing models for studying mtDNA defects include cell cultures, yeast, and animal models.

Purpose of the Study:

  • To investigate the role of mtDNA in physiological processes and disease.
  • To evaluate the utility of agents like ethidium bromide (EB), chloramphenicol, and doxycycline in generating mtDNA-deficient models.
  • To understand the downstream consequences of mtDNA defects, including metabolic alterations and their impact on longevity.

Main Methods:

  • Generation of mtDNA-deficient models using chemical agents like ethidium bromide (EB), chloramphenicol, and doxycycline.
  • Culturing of mtDNA-deficient cells requiring specific supplements (uridine, pyruvate).
  • Analysis of lifespan and phenotypic effects of EB treatment at different life stages in C. elegans.
  • Examination of metabolic consequences in an mtDNA mutator mouse model.

Main Results:

  • Ethidium bromide (EB) inhibits mtDNA replication, while chloramphenicol and doxycycline inhibit mitochondrial translation, both yielding mtDNA-deficient phenotypes.
  • Cultured mtDNA-deficient cells require uridine and pyruvate for survival; pyruvate supplementation can induce negative effects like lactic acidosis.
  • In C. elegans, EB extends lifespan if administered during larval development but shortens it if given post-adulthood.
  • mtDNA mutator mice did not exhibit increased free radical production, suggesting other mechanisms like impaired pyrimidine synthesis and altered NADH/NAD pools are key downstream effects.

Conclusions:

  • The choice of method and timing for inducing mtDNA defects is critical, particularly for organismal studies and longevity research.
  • Downstream effects of mtDNA defects involve metabolic dysregulation, including pyrimidine synthesis and the NADH/NAD balance, rather than solely increased free radicals.
  • Conditional knockout studies in adult organisms are recommended for a more nuanced understanding of mtDNA gene function in aging and disease.