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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...
ATP Synthase: Mechanism01:48

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...
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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 irrespective...
Translation01:31

Translation

Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Translation01:31

Translation

Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Mutations01:39

Mutations

Overview

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Related Experiment Video

Updated: May 26, 2026

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

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Published on: November 23, 2011

Nuclear gene defects in mitochondrial disorders.

Fernando Scaglia1

  • 1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA. fscaglia@bcm.edu

Methods in Molecular Biology (Clifton, N.J.)
|January 5, 2012
PubMed
Summary
This summary is machine-generated.

Most infant mitochondrial diseases stem from nuclear gene mutations, not mitochondrial DNA. Advances in genetic sequencing are crucial for diagnosing these complex conditions affecting mitochondrial function.

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Area of Science:

  • Biochemistry
  • Genetics
  • Pediatrics

Background:

  • Mitochondrial cytopathies in infants are often linked to nuclear gene mutations affecting mitochondrial proteins.
  • The number of identified disease-causing nuclear genes has rapidly increased, complicating diagnosis.
  • These genes are vital for mitochondrial respiration, assembly, DNA maintenance, protein synthesis, and dynamics.

Purpose of the Study:

  • To highlight the shift in understanding the genetic basis of infant mitochondrial diseases.
  • To discuss the diagnostic challenges posed by the growing number of implicated nuclear genes.
  • To emphasize the potential of new technologies in resolving diagnostic dilemmas.

Main Methods:

  • Review of current literature on mitochondrial cytopathies and genetic mutations.
  • Analysis of the expanding landscape of nuclear genes involved in mitochondrial function.
  • Consideration of advancements in next-generation sequencing technologies.

Main Results:

  • Nuclear gene mutations are the predominant cause of infant mitochondrial cytopathies.
  • A significant increase in identified disease-causing nuclear genes has been observed.
  • The complexity of genetic causes presents diagnostic challenges.

Conclusions:

  • Diagnosis of infant mitochondrial cytopathies requires a comprehensive understanding of nuclear gene involvement.
  • Next-generation sequencing offers a promising approach to overcome current diagnostic limitations.
  • Further research into nuclear gene-encoded mitochondrial proteins is essential for improved diagnostics and therapies.