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Animal Mitochondrial Genetics

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...

Mitochondrial Membranes

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 Precursor Proteins

Mitochondrial Precursor Proteins

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...

Mitochondria

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,...

Mitochondrial Protein Sorting

Mitochondrial Protein Sorting

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...

Electron Transport Chain: Complex I and II

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...

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Updated: Jul 19, 2025

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

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Mitochondrial encephalomyopathy.

Yi Shiau Ng¹, Robert McFarland²

¹Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom.

Handbook of Clinical Neurology

|August 10, 2023

Summary

This summary is machine-generated.

Mitochondrial dysfunction causes nervous system disorders due to over 300 genetic defects. Advances in genetic sequencing and multiomics analysis have revolutionized diagnosis, though specific therapies remain limited.

Keywords:

Ataxia CPEO Leigh syndrome MELAS Mitochondrial DNA Movement disorders Myopathy Neuropathy

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Area of Science:

Biochemistry and Molecular Biology
Neuroscience
Genetics

Background:

Mitochondrial dysfunction, particularly in ATP generation, disrupts cellular balance and frequently causes central and peripheral nervous system pathologies.
Mitochondrial diseases stem from over 300 genetic defects impacting both mitochondrial and nuclear genomes, presenting diverse clinical syndromes.

Approach:

Diagnostic approaches have evolved from skeletal muscle biopsy to advanced next-generation sequencing and multiomics analysis.
These technological advancements have significantly improved the scope and accessibility of diagnosing mitochondrial diseases.

Key Points:

Mitochondrial diseases manifest with variable organ involvement and neurological symptoms across all age groups.
Neurological presentations include developmental delay, seizures, stroke-like episodes, movement disorders, optic neuropathy, myopathy, and neuropathy.

Conclusions:

While specific therapies for most mitochondrial diseases are lacking, research and clinical trials are advancing.
Effective management of symptoms like epilepsy, stroke-like episodes, and Parkinsonism is crucial for improving patient quality of life and reducing mortality.