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Animal Mitochondrial Genetics02:59

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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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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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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...
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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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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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Related Experiment Video

Updated: Apr 20, 2026

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase COX/SDH Double-labeling Histochemistry
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Reversible infantile mitochondrial diseases.

Veronika Boczonadi1, Boglarka Bansagi, Rita Horvath

  • 1Institute of Human Genetics, Newcastle University, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK.

Journal of Inherited Metabolic Disease
|November 20, 2014
PubMed
Summary
This summary is machine-generated.

Rare mitochondrial diseases can spontaneously recover, particularly infantile mitochondrial myopathy and TRMU deficiency. Understanding these recoveries may unlock new treatments for mitochondrial diseases.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Pediatrics

Background:

  • Mitochondrial diseases are typically severe and progressive.
  • Rare forms of mitochondrial disease exhibit spontaneous recovery, offering hope for treatment.

Purpose of the Study:

  • To summarize the clinical presentation of reversible mitochondrial diseases.
  • To explore the molecular mechanisms underlying spontaneous recovery in these conditions.

Main Methods:

  • Literature review of reported cases of reversible mitochondrial diseases.
  • Analysis of clinical data and genetic information from affected infants.
  • Discussion of potential molecular pathways involved in recovery.

Main Results:

  • Infantile mitochondrial myopathy due to mt-tRNA(Glu) mutations shows recovery with life support.
  • TRMU deficiency causing liver failure in infancy can also lead to complete recovery.
  • Partial recovery is observed in other rare mitochondrial tRNA synthetase and modifying enzyme deficiencies.

Conclusions:

  • Reversible mitochondrial diseases present unique clinical courses.
  • Understanding the mechanisms of recovery is crucial for developing novel therapeutic strategies.
  • These insights could benefit a broader range of mitochondrial disease patients lacking effective treatments.