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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,...

Non-nuclear Inheritance

Non-nuclear Inheritance

Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.

Export of Mitochondrial and Chloroplast Genes

Export of Mitochondrial and Chloroplast Genes

A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred irrespective...

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,...

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: Jun 17, 2026

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Published on: March 17, 2023

Mitochondrial DNA in tumors.

Anna Lorenc¹, Jaroslaw Bryk, Ewa Bartnik

¹Postgraduate School of Molecular Medicine, Warsaw, Poland.

Toxicology Mechanisms and Methods

|December 22, 2009

Summary

Mitochondria are key to cell death and aging, and their dysfunction is linked to cancer development. Targeting abnormal mitochondria offers a promising strategy for novel anticancer drugs and potential cancer markers.

Area of Science:

Cellular Biology
Biochemistry
Oncology

Background:

Mitochondria, often called cellular powerhouses, are increasingly implicated in aging processes.
Abnormalities in mitochondrial function are strongly suspected to contribute to cancer development.
Dysfunctional mitochondria are implicated in apoptosis, aging, and cancer progression.

Purpose of the Study:

To explore the role of mitochondrial dysfunction in cancer development.
To investigate mitochondrial DNA alterations as potential cancer markers.
To assess mitochondria as therapeutic targets for anticancer drugs.

Main Methods:

Analysis of mitochondrial transcription and oxidative phosphorylation pathways in cancer.
Detection of somatic mutations and quantitative changes in mitochondrial DNA within tumors.

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Transmitochondrial Cybrid Generation Using Cancer Cell Lines

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Review of evidence linking mitochondrial abnormalities to carcinogenesis.

Main Results:

Changes in mitochondrial transcription and oxidative phosphorylation are observed in various cancers.
Somatic mutations and quantitative alterations in mitochondrial DNA are present in tumors.
Mitochondrial DNA alterations suggest a role in carcinogenesis and potential as cancer markers.

Conclusions:

Mitochondrial dysfunction is a significant factor in cancer development.
Altered mitochondrial DNA and respiratory deficiency are implicated in carcinogenesis.
Mitochondria represent viable targets for developing new anticancer therapies and diagnostic markers.