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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...

Energy to Drive Translocation

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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Related Experiment Video

Updated: Jun 22, 2026

Labelling and Visualization of Mitochondrial Genome Expression Products in Baker's Yeast Saccharomyces cerevisiae

Labelling and Visualization of Mitochondrial Genome Expression Products in Baker's Yeast Saccharomyces cerevisiae

Published on: April 11, 2021

Computationally driven, quantitative experiments discover genes required for mitochondrial biogenesis.

David C Hess¹, Chad L Myers, Curtis Huttenhower

¹Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ, USA.

|March 21, 2009

Summary

This summary is machine-generated.

Researchers identified 109 proteins affecting mitochondrial biogenesis and inheritance in yeast, including conserved human disease genes. This study enhances our understanding of mitochondrial functions and genetic interactions.

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Last Updated: Jun 22, 2026

Labelling and Visualization of Mitochondrial Genome Expression Products in Baker's Yeast Saccharomyces cerevisiae

Labelling and Visualization of Mitochondrial Genome Expression Products in Baker's Yeast Saccharomyces cerevisiae

Published on: April 11, 2021

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

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High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution

High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution

Published on: May 5, 2023

Area of Science:

Cell Biology
Genetics
Biochemistry

Background:

Mitochondria are vital organelles involved in cellular respiration, ion homeostasis, and apoptosis.
Understanding the genetic basis of mitochondrial function is crucial for human health.

Purpose of the Study:

To identify novel proteins involved in mitochondrial biogenesis and inheritance in Saccharomyces cerevisiae.
To increase the known participants in these processes by approximately 25%.

Main Methods:

Computational predictions combined with quantitative experiments.
Targeted double-mutant analysis.
Growth profiling and dual immunofluorescence.

Main Results:

Identified 100 proteins affecting mitochondrial biogenesis and inheritance.
Discovered nine additional genes with synthetic defects in mitochondrial biogenesis.
Found that nearly half of the new proteins are conserved in mammals, with some linked to human diseases.
Detected subtle mitochondrial transmission phenotypes missed by traditional and high-throughput methods.
Localized 47 uncharacterized proteins to mitochondria.
Identified genes critical for aerobic respiration and mitochondrial motility.

Conclusions:

Computational analysis effectively directs experimental assays to uncover subtle mitochondrial defects.
This study significantly expands the repertoire of known genes involved in mitochondrial biogenesis and inheritance.
The findings have implications for understanding human diseases linked to mitochondrial dysfunction.