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Updated: Aug 17, 2026
An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model
Published on: March 9, 2022
Mitochondrial DNA in somatic cells: a promising target of routine clinical tests
Dongchon Kang1, Naotaka Hamasaki
1Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Graduate School of Medical Sciences, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan. kang@mailserver.med.kyushu-u.ac.jp
Abstract:
Alterations of mitochondrial DNA have long been considered only from a point of view of rare genetic disorders causing neuromyopathy. Recently, alterations of mitochondrial DNA have been found in so-called common diseases such as heart failure, diabetes, and cancer; some of these alterations are inherited, and some are generated and/or accumulated in somatic cells with age. Mitochondrial DNA is more vulnerable to alteration than is nuclear DNA. For example, mitochondria produce a large amount of reactive oxygen species as an inevitable byproduct of oxidative phosphorylation. Therefore, mitochondrial DNA is under much stronger oxidative stress than is nuclear DNA. In spite of the importance, it is much less elucidated in the mitochondrial genome than in the nuclear genome how the genome is maintained. In this review, we focus on maintenance of mitochondrial DNA in somatic cells and its clinical importance.
Insights
Mitochondrial DNA (mtDNA) alterations are linked to common diseases like diabetes and cancer, not just rare disorders. This review explores mtDNA maintenance in somatic cells and its clinical significance.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Mitochondrial DNA (mtDNA) alterations were historically linked to rare neuromyopathies.
- Emerging evidence connects mtDNA alterations to prevalent conditions including heart failure, diabetes, and cancer.
- mtDNA is highly susceptible to damage due to reactive oxygen species production during oxidative phosphorylation.
Purpose of the Study:
- To review the maintenance mechanisms of mitochondrial DNA in somatic cells.
- To highlight the clinical importance of mitochondrial DNA maintenance in common diseases.
- To bridge the knowledge gap regarding mitochondrial genome maintenance compared to nuclear DNA.
Main Methods:
- Literature review focusing on mitochondrial DNA maintenance.
- Analysis of studies linking mtDNA alterations to common diseases.
- Exploration of oxidative stress impact on mtDNA integrity.
Main Results:
- mtDNA alterations are implicated in aging and common diseases.
- Somatic mtDNA mutations and accumulations contribute to disease pathogenesis.
- Mechanisms of mtDNA maintenance are less understood than nuclear DNA maintenance.
Conclusions:
- Understanding mtDNA maintenance is crucial for addressing common diseases.
- mtDNA integrity plays a significant role in cellular health and disease prevention.
- Further research into mtDNA maintenance pathways is warranted for therapeutic development.
