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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,...

Mitochondria

Mitochondria

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 Membranes

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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...

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Related Experiment Video

Updated: Apr 30, 2026

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Published on: February 10, 2023

Pressing mitochondrial genetics forward.

Yu-Chan Chen¹, Jared Rutter¹

¹Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.

|May 13, 2014

Summary

This summary is machine-generated.

Researchers used RNAi screening to investigate mitochondrial proteins. They discovered crucial new roles for AK4 and FASTKD4, two previously uncharacterized mitochondrial proteins, highlighting the power of genetic screens.

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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

Area of Science:

Cell Biology
Genetics
Mitochondrial Biology

Background:

Mitochondria are vital organelles involved in numerous cellular processes.
Understanding the function of all mitochondrial proteins is essential for comprehending cellular health and disease.
Many mitochondrial proteins remain poorly characterized, representing knowledge gaps in cell biology.

Purpose of the Study:

To employ RNA interference (RNAi) screening to investigate the mitochondrial proteome.
To identify the functions of previously uncharacterized mitochondrial proteins.
To demonstrate the utility of forward genetic screens in uncovering mitochondrial protein functions.

Main Methods:

Utilized RNAi-based screening approaches targeting the mitochondrial proteome.
Conducted genetic screens to identify genes with significant effects on mitochondrial function.
Focused on analyzing the roles of specific, poorly characterized mitochondrial proteins.

Main Results:

Identified key roles for two previously poorly characterized mitochondrial proteins: AK4 and FASTKD4.
Demonstrated that AK4 and FASTKD4 are crucial for specific mitochondrial functions.
Highlighted the effectiveness of RNAi screening in uncovering novel biological functions.

Conclusions:

AK4 and FASTKD4 play important, previously unrecognized roles in mitochondrial biology.
Forward genetic screens are powerful tools for deciphering the functions of mysterious mitochondrial proteins.
These findings contribute to a deeper understanding of mitochondrial proteome and cellular functions.