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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...
Export of Mitochondrial and Chloroplast Genes02:19

Export of Mitochondrial and Chloroplast Genes

A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred irrespective...
Non-nuclear Inheritance01:29

Non-nuclear Inheritance

Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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,...
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 Protein Sorting01:39

Mitochondrial Protein Sorting

Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...

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An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model
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Mitochondrial nucleoids maintain genetic autonomy but allow for functional complementation.

Robert W Gilkerson1, Eric A Schon, Evelyn Hernandez

  • 1Department of Neurology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.

The Journal of Cell Biology
|June 25, 2008
PubMed
Summary
This summary is machine-generated.

Mitochondrial DNA (mtDNA) nucleoids maintain genetic content rather than freely exchanging it. This discovery explains mitochondrial inheritance and aids in eliminating harmful mtDNA mutations.

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Area of Science:

  • Mitochondrial biology
  • Genetics
  • Cell biology

Background:

  • Mitochondrial DNA (mtDNA) is organized into nucleoids, but how mtDNA content is propagated is debated.
  • Proposed mechanisms include faithful maintenance or dynamic exchange of mtDNA within nucleoids.

Purpose of the Study:

  • To directly test the models of mtDNA propagation within nucleoids.
  • To visualize and analyze mtDNA content at the nucleoid level.

Main Methods:

  • Fusion of two cell lines, each with a unique, partially deleted mtDNA.
  • Cells were deficient in mitochondrial protein synthesis for clear visualization.
  • Analysis of mtDNA organization within nucleoids post-fusion.

Main Results:

  • Fused cells showed transcomplementation, restoring mitochondrial protein synthesis.
  • Two distinct mtDNAs were visualized within separate, non-intermixing nucleoids.
  • Results indicate stable, regulated mtDNA content within individual nucleoids.

Conclusions:

  • Mitochondrial nucleoids tightly regulate their genetic content, refuting dynamic exchange models.
  • This genetic autonomy provides a mechanism for mitochondrial genetic inheritance.
  • Findings support therapeutic strategies for correcting detrimental mtDNA mutations.