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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...
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.
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...
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,...
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,...
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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,...

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Related Experiment Video

Updated: Jun 20, 2026

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
07:24

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Published on: February 10, 2023

Mitochondrial DNA nucleoids determine mitochondrial genetics and dysfunction.

Robert W Gilkerson1

  • 1Department of Neurology, College of Physicians & Surgeons, Columbia University, Russ Berrie Pavilion 307, 1150 St. Nicholas Ave., New York, NY 10032, USA. rg2156@columbia.edu

The International Journal of Biochemistry & Cell Biology
|August 26, 2009
PubMed
Summary
This summary is machine-generated.

Mitochondrial DNA (mtDNA) is organized into nucleoids, crucial for cellular energy. Understanding nucleoid dynamics and proteins offers insights into mitochondrial dysfunction and potential therapies.

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Last Updated: Jun 20, 2026

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Published on: February 10, 2023

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Area of Science:

  • Cellular Biology
  • Genetics
  • Biochemistry

Background:

  • Mitochondrial DNA (mtDNA) is essential for cellular homeostasis.
  • The mechanisms of mtDNA inheritance and propagation are not fully understood.
  • mtDNA is organized into macromolecular assemblies called nucleoids.

Purpose of the Study:

  • To review current research on mitochondrial nucleoids.
  • To explore nucleoid-associated proteins and their dynamics.
  • To understand the impact of nucleoid organization on mitochondrial dysfunction.

Main Methods:

  • Literature review of current research on mitochondrial nucleoids.
  • Analysis of studies on nucleoid-associated proteins.
  • Examination of research on nucleoid dynamics and distribution.

Main Results:

  • Mitochondrial nucleoids are the molecular organizing units of mitochondrial genetics.
  • Nucleoid organization influences cellular bioenergetics.
  • Dysfunctional nucleoid organization is linked to mitochondrial dysfunction.

Conclusions:

  • Mitochondrial nucleoids are key to mtDNA inheritance and cellular energy production.
  • Further research into nucleoid organization can reveal causes of bioenergetic crisis.
  • Understanding nucleoids may lead to therapeutic strategies for mitochondrial diseases.