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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...

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 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,...

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...

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 precursors...

Translocation of Proteins into the Mitochondria

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

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Related Experiment Video

Updated: Jun 30, 2026

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model

Published on: March 9, 2022

Recent Advances in Mitochondrial Disease.

Lyndsey Craven¹, Charlotte L Alston¹, Robert W Taylor¹

¹Wellcome Centre for Mitochondrial Research, Institute of Neuroscience, Medical School, Newcastle University, Newcastle upon Tyne NE2 4HH, United Kingdom;

Annual Review of Genomics and Human Genetics

|April 19, 2017

Summary

This summary is machine-generated.

Recent advances in mitochondrial disease genetics have improved diagnosis and prevention strategies. This review covers mitochondrial biology, new disease genes, and methods to prevent mitochondrial DNA transmission.

Keywords:

genetic diagnosis mitochondrial disease mitochondrial function mitochondrial therapy reproductive options

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Area of Science:

Genetics
Molecular Biology
Clinical Medicine

Background:

Mitochondrial diseases arise from genetic contributions from two distinct genomes.
Clinical presentation is diverse, often lacking a genetic diagnosis.
Significant progress has been made in the last five years.

Purpose of the Study:

To provide an overview of mitochondrial biology.
To describe recent advances in the diagnosis and genetic basis of mitochondrial disease.
To highlight evolving prevention strategies for mitochondrial DNA disease transmission.

Main Methods:

Literature review of recent advancements in mitochondrial disease research.
Synthesis of information on mitochondrial origin, function, and biology.
Identification and discussion of newly described disease genes and diagnostic methodologies.

Main Results:

An overview of mitochondrial biology is presented.
Recent progress in genetic diagnosis of mitochondrial diseases is detailed.
Newly identified genes and novel prevention techniques are highlighted.

Conclusions:

Understanding mitochondrial biology is crucial for diagnosing and treating mitochondrial diseases.
Advances in genetic analysis are improving diagnostic capabilities.
New methodologies offer hope for preventing mitochondrial DNA disease transmission.