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Related Concept Videos

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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Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes

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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Export of Mitochondrial and Chloroplast Genes02:19

Export of Mitochondrial and Chloroplast Genes

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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...
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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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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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Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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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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Related Experiment Video

Updated: Jan 30, 2026

Author Spotlight: Establishing a New Fluorescence-Based Protocol for In Vivo Mitochondrial Morphology Analysis in Parkinson's Disease
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[Mitochondrial diseases 2018].

Ewa Bartnik1, Katarzyna Tońska1, Joanna Rusecka1

  • 1Instytut Genetyki i Biotechnologii, Wydział Biologii Uniwersytetu Warszawskiego, Warszawa.

Postepy Biochemii
|January 19, 2019
PubMed
Summary

Mitochondrial diseases stem from oxidative phosphorylation system dysfunction, caused by DNA mutations. Advances in genetic testing offer new hope for diagnosing and treating these complex, heritable disorders.

Area of Science:

  • Biochemistry
  • Genetics
  • Clinical Medicine

Background:

  • Mitochondrial diseases arise from impaired mitochondrial oxidative phosphorylation.
  • These heritable disorders result from mutations in mitochondrial or nuclear DNA.
  • They present diverse clinical manifestations, complicating diagnosis.

Purpose of the Study:

  • To review recent advancements in understanding mitochondrial diseases.
  • To discuss novel diagnostic approaches for mitochondrial disorders.
  • To highlight emerging reproductive options for affected families.

Main Methods:

  • Literature review of recent research on mitochondrial diseases.
  • Analysis of current genetic testing technologies.
  • Discussion of new reproductive strategies.

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Main Results:

  • Genetic testing and reproductive options show promise for improved identification and treatment.
  • Understanding of disease mechanisms continues to evolve.
  • Diagnostic challenges persist due to disease heterogeneity.

Conclusions:

  • Recent advances significantly impact the diagnosis and management of mitochondrial diseases.
  • Novel genetic and reproductive technologies offer new hope for patients.
  • Continued research is crucial for addressing diagnostic complexities.