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The role of mitochondria in ageing and carcinogenesis
1Dermatological Sciences, School of Clinical and Laboratory Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne, UK. m.a.birch-machin@newcastle.ac.uk
Abstract:
Mitochondria can perform multiple cellular functions including energy production, cell proliferation and apoptosis. These organelles contain their own genetic material, mitochondrial DNA (mtDNA), which is maternally inherited. Although much smaller than the nuclear genome, mtDNA is equally important, as it has been hypothesized to play a crucial role in ageing and carcinogenesis. This is partly due to the fact that mitochondria represent the major site for the generation of cellular oxidative stress and play a key role in mediating programmed cell death (apoptosis). Damage to mtDNA is therefore an important contributor to human ageing, cancer and neurodegenerative diseases. The most relevant footprints of mtDNA damage are point mutations of single bases, or deletions of the 16.5-kb mitochondrial genome. This review will focus on the key roles of mitochondrial function and mtDNA in oxidative stress production and as a mediator of apoptosis, and on the use of mtDNA as a biomarker of sun exposure. This will be related to the contribution of mitochondria and mtDNA in the ageing process and cancer, with a specific focus on human skin. In conclusion, it is likely that the interplay between nuclear and mitochondrial genes may hold the final understanding of the mitochondrial role in these disease processes.
Insights
Mitochondrial DNA (mtDNA) damage contributes to aging and cancer. This review explores mtDNA
Area of Science:
- Cellular Biology
- Genetics
- Biochemistry
Background:
- Mitochondria are vital organelles involved in energy production, proliferation, and apoptosis.
- Mitochondrial DNA (mtDNA), though small, is crucial and linked to aging and cancer.
- Mitochondria are primary sources of cellular oxidative stress and mediators of apoptosis.
Purpose of the Study:
- To review the roles of mitochondrial function and mtDNA in oxidative stress and apoptosis.
- To examine mtDNA as a biomarker for sun exposure.
- To discuss the contribution of mitochondria and mtDNA to aging and cancer, particularly in human skin.
Main Methods:
- Literature review focusing on mitochondrial function, mtDNA damage, oxidative stress, apoptosis, and biomarker applications.
- Analysis of the interplay between nuclear and mitochondrial genes in disease processes.
Main Results:
- mtDNA damage, including point mutations and deletions, is a significant factor in aging, cancer, and neurodegenerative diseases.
- Mitochondrial function and mtDNA are implicated in oxidative stress production and apoptosis mediation.
- mtDNA serves as a potential biomarker for sun exposure.
Conclusions:
- The interplay between nuclear and mitochondrial genes is key to understanding mitochondrial roles in disease.
- Mitochondrial dysfunction and mtDNA damage are critical in aging and carcinogenesis, especially in sun-exposed skin.
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