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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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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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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.
Most of the mitochondrial...
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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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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...
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Mitochondria01:37

Mitochondria

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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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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.
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Related Experiment Video

Updated: Sep 12, 2025

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase COX/SDH Double-labeling Histochemistry
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Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase COX/SDH Double-labeling Histochemistry

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Updates on Mitochondrial Myopathies.

Emanuele Barca1, Valentina Emmanuele2

  • 1Department of Neurology, Columbia University Medical Center, New York, USA. eb2877@cumc.columbia.edu.

Current Neurology and Neuroscience Reports
|August 5, 2025
PubMed
Summary
This summary is machine-generated.

Mitochondrial myopathies (MM) are underrecognized genetic disorders. This review offers diagnostic and management guidance, highlighting new tools and therapies for improved patient outcomes.

Keywords:
Exercise intoleranceMitochondrial myopathyMuscle biopsyNext-generation sequencingRhabdomyolysisTK2 deficiency

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Area of Science:

  • Neurology
  • Genetics
  • Mitochondrial Biology

Background:

  • Mitochondrial myopathies (MM) represent a diverse group of genetic disorders.
  • These conditions are often underdiagnosed in both pediatric and adult neurology settings.

Purpose of the Study:

  • To provide a practical clinical guide for diagnosing and managing mitochondrial myopathies.
  • To review advancements in diagnostic technologies and disease-modifying treatments for MM.

Main Methods:

  • Review of large cohort data to identify key clinical subtypes.
  • Analysis of novel diagnostic tools including GDF-15 and advanced sequencing.
  • Evaluation of emerging therapeutic strategies and preclinical developments.

Main Results:

  • Key MM subtypes (fixed, syndromic, metabolic) have distinct diagnostic implications.
  • New tools like GDF-15 and long-read mtDNA sequencing improve diagnostic accuracy.
  • Promising therapies for TK2 deficiency and gene editing are advancing rapidly.

Conclusions:

  • Early recognition of MM is crucial for timely diagnosis, prognosis, and family planning.
  • A tiered diagnostic approach integrating genomic technologies enhances patient outcomes.
  • Emerging treatments offer hope for patients with these severe disorders.