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Related Concept Videos

Mitochondria01:37

Mitochondria

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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,...
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Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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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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Mitochondrial Membranes01:45

Mitochondrial Membranes

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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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Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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.
ROS generation is regulated and maintained at moderate levels necessary...
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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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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 Mutations and Ageing.

Julia C Whitehall1, Anna L M Smith1, Laura C Greaves2

  • 1Wellcome Centre for Mitochondrial Research, Biosciences Institute, Newcastle University, Newcastle Upon Tyne, UK.

Sub-Cellular Biochemistry
|January 4, 2023
PubMed
Summary
This summary is machine-generated.

Mitochondrial DNA mutations are linked to cellular aging and dysfunction. Research explores their causal role in aging versus being a consequence, focusing on stem cells and inflammation.

Keywords:
AgeingCellular damageDNAFree radical damageMitochondriaMolecular damageMutations

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Area of Science:

  • Cell Biology
  • Genetics
  • Gerontology

Background:

  • Mitochondria are vital organelles involved in cellular energy, signaling, and apoptosis.
  • Mitochondrial dysfunction is observed in aging tissues, with mitochondrial DNA (mtDNA) mutations implicated.
  • The role of mtDNA mutations in aging remains debated: causal factor or consequence?

Purpose of the Study:

  • To review the structure and genetics of mammalian mitochondria.
  • To examine the evidence linking mtDNA mutations to the aging process.
  • To explore the role of mitochondrial dysfunction in stem cell aging and age-related inflammation.

Main Methods:

  • Literature review of mitochondrial structure and genetics.
  • Analysis of current evidence on mtDNA mutations and aging.
  • Focus on recent discoveries in stem cell aging and inflammation.

Main Results:

  • Mitochondria play crucial roles in cellular metabolism and function.
  • mtDNA mutations are associated with decreased oxidative phosphorylation capacity.
  • Emerging evidence points to mitochondrial dysfunction in stem cell aging and inflammation.

Conclusions:

  • Mitochondrial DNA mutations are central to the aging debate.
  • Further research is needed to clarify the causal role of mtDNA mutations in aging.
  • Mitochondrial dysfunction significantly impacts stem cell aging and age-related inflammation.