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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...
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,...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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,...
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...
Epistasis01:39

Epistasis

In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...

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Related Experiment Video

Updated: Jun 11, 2026

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry
06:53

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

Published on: November 23, 2011

Mitochondrial-nuclear epistasis: implications for human aging and longevity.

Gregory J Tranah1

  • 1California Pacific Medical Center Research Institute, San Francisco Coordinating Center, UCSF, 94107-1728, USA. gtranah@sfcc-cpmc.net

Ageing Research Reviews
|July 6, 2010
PubMed
Summary

Mitochondria play a key role in aging. Genetic variations in both mitochondrial DNA (mtDNA) and nuclear DNA interact to influence cellular energy, oxidative stress, and lifespan, impacting the aging process.

Related Experiment Videos

Last Updated: Jun 11, 2026

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry
06:53

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

Published on: November 23, 2011

Area of Science:

  • Gerontology
  • Molecular Biology
  • Genetics

Background:

  • Mitochondria are crucial for cellular energy production and are implicated in aging.
  • Mitochondrial function depends on both nuclear and mitochondrial genes, with variations linked to lifespan.
  • Impaired mitochondrial function contributes to cellular aging through energy imbalance and oxidative stress.

Purpose of the Study:

  • To explore the complex genetic interactions between nuclear and mitochondrial DNA in aging and longevity.
  • To investigate how variations in mitochondrial DNA (mtDNA) and nuclear DNA influence aging processes.
  • To understand the role of nuclear-mitochondrial interactions in modulating lifespan.

Main Methods:

  • Review of existing evidence on mitochondrial genetics and aging.
  • Analysis of genetic variation in nuclear and mitochondrial genomes.
  • Examination of gene interactions (epistasis) affecting longevity.
  • Consideration of pathways such as oxidative phosphorylation, antioxidant defenses, and sirtuin regulation.

Main Results:

  • Mitochondrial DNA (mtDNA) haplotype effects on longevity are dependent on the nuclear genetic background.
  • Inconsistent associations between mtDNA haplogroups and human survival may be explained by these gene interactions.
  • Multiple pathways, including energy metabolism and stress response, are involved in mitochondrial regulation of longevity.

Conclusions:

  • Aging and longevity are complex traits influenced by genetic factors.
  • Nuclear gene variants interact with inherited and somatic mitochondrial DNA variability to control aging and lifespan.
  • Understanding these complex genetic interactions is key to deciphering the aging process.