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Mitochondrial Adaptations Underlying Tetraploidization in Human Cancer, Fungal, and Yeast Models
Mohamed Jemaà1,2,3, Ameni Bedoui4, Nihel Ammous4
1Human Genetics Laboratory, Faculty of Medicine of Tunis, Tunis El Manar University, 5, Rue Hassouna Ben Ayed-1007 Bab Saadoun Tunis, Tunis 2092, Tunisia.
Biology
|January 28, 2026
Summary
Tetraploidization, or whole-genome duplication, leads to larger cells with more mitochondria and higher metabolic activity in both cancer and yeast models. This mitochondrial adaptation is key in chromosomally unstable tumors.
Area of Science:
- Cell Biology
- Genetics
- Metabolism
Background:
- Whole-genome duplication (tetraploidization) is observed in cells, tissues, and organisms.
- In human cancers, tetraploidization drives genomic instability, tumor progression, metastasis, and drug resistance.
- These cancer adaptations necessitate metabolic rewiring, particularly mitochondrial plasticity.
Purpose of the Study:
- To investigate the relationship between mitochondrial quantity/activity and tetraploidization.
- To compare mitochondrial characteristics (transmembrane potential, intracellular calcium, oxidative stress) in diploid versus tetraploid cancer cells and model organisms.
Main Methods:
- Comparative analysis of diploid and tetraploid cells from human cancers (colon, sarcoma, liver).
- Analysis of diploid and tetraploid strains of fungal and yeast models (Candida albicans, Saccharomyces cerevisiae).
- Assessment of cell size, mitochondrial content, metabolic activity, mitochondrial transmembrane potential, intracellular calcium, and oxidative stress.
Main Results:
- Tetraploid cells, across human cancer and yeast models, consistently showed enlarged cell size.
- Tetraploid cells exhibited elevated mitochondrial content compared to diploid counterparts.
- Heightened metabolic activity was a consistent feature of tetraploid cells.
Conclusions:
- Mitochondrial adaptation is a significant hallmark of tetraploidization.
- Tetraploidization influences cell size, mitochondrial biogenesis, and metabolic function.
- Understanding mitochondrial adaptations in tetraploid cells offers potential therapeutic targets for chromosomally unstable tumors.
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