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Mitotic catastrophe and endomitosis in tumour cells: an evolutionary key to a molecular solution
Jekaterina Erenpreisa1, M Kalejs, M S Cragg
1Lab. Tum. Cell Biol., Biomedicine Centre of the Latvia University, Ratsupites 1, Riga LV-1067, Latvia. katrina@biomed.lu.lv
Abstract:
Following genotoxic insult, p53 mutated tumour cells undergo mitotic catastrophe. This is characterised by a switch from mitosis to the endocycle. The essential difference between mitosis and the endocycle is that in the latter, DNA synthesis is uncoupled from cell division, which leads to the formation of endopolyploid cells. Recent data suggests that a return from the endocycle into mitosis is also possible. Furthermore, our observations indicate that a particular type of endocycle known as endomitosis may be involved in this return. Here we review the role of endomitosis in the somatic reduction of polyploidy during development and its postulated role in the evolution of meiosis. Finally, we incorporate these evolutionary data to help interpret our most recent observations in the tumour cell system, which indicate a role for endomitosis and meiotic regulators, in particular p39mos in the segregation of genomes (somatic reduction) of these endopolyploid cells.
Insights
Tumor cells with mutated p53 can enter endomitosis, a cell cycle state. This process may enable the somatic reduction of polyploidy in tumor cells, potentially involving meiotic regulators like p39mos.
Area of Science:
- Cell Biology
- Cancer Research
- Evolutionary Biology
Background:
- Genotoxic insult triggers mitotic catastrophe in p53-mutated tumor cells, characterized by a shift from mitosis to the endocycle.
- The endocycle involves DNA synthesis uncoupled from cell division, resulting in endopolyploid cells.
- Emerging evidence suggests a potential return from the endocycle to mitosis.
Purpose of the Study:
- To review the role of endomitosis in somatic reduction of polyploidy during development.
- To explore the postulated role of endomitosis in the evolution of meiosis.
- To interpret recent observations on endomitosis and meiotic regulators in tumor cells.
Main Methods:
- Literature review on endomitosis, polyploidy, meiosis, and tumor cell cycles.
- Analysis of recent experimental data on p53-mutated tumor cells undergoing endomitosis.
- Integration of evolutionary data with tumor cell observations.
Main Results:
- Endomitosis is implicated in the somatic reduction of polyploidy during development.
- Endomitosis may have played a role in the evolution of meiosis.
- Endomitosis and meiotic regulators, specifically p39mos, are involved in genome segregation in endopolyploid tumor cells.
Conclusions:
- Endomitosis is a key process for somatic reduction of polyploidy and potentially in meiosis evolution.
- Meiotic regulators, including p39mos, are crucial for genome segregation in tumor cells undergoing endomitosis.
- Understanding endomitosis offers insights into tumor cell behavior and evolution of cell division.
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