1. Caspase-2 regulates S-phase cell cycle events to protect from DNA damage accumulation independent of apoptosis.
- Author
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Boice AG, Lopez KE, Pandita RK, Parsons MJ, Charendoff CI, Charaka V, Carisey AF, Pandita TK, and Bouchier-Hayes L
- Subjects
- Animals, Apoptosis, Humans, Mice, Caspase 2 genetics, Cell Cycle genetics, DNA Damage genetics
- Abstract
In addition to its classical role in apoptosis, accumulating evidence suggests that caspase-2 has non-apoptotic functions, including regulation of cell division. Loss of caspase-2 is known to increase proliferation rates but how caspase-2 is regulating this process is currently unclear. We show that caspase-2 is activated in dividing cells in G1-phase of the cell cycle. In the absence of caspase-2, cells exhibit numerous S-phase defects including delayed exit from S-phase, defects in repair of chromosomal aberrations during S-phase, and increased DNA damage following S-phase arrest. In addition, caspase-2-deficient cells have a higher frequency of stalled replication forks, decreased DNA fiber length, and impeded progression of DNA replication tracts. This indicates that caspase-2 protects from replication stress and promotes replication fork protection to maintain genomic stability. These functions are independent of the pro-apoptotic function of caspase-2 because blocking caspase-2-induced cell death had no effect on cell division, DNA damage-induced cell cycle arrest, or DNA damage. Thus, our data supports a model where caspase-2 regulates cell cycle and DNA repair events to protect from the accumulation of DNA damage independently of its pro-apoptotic function., (© 2021. The Author(s), under exclusive licence to Springer Nature Limited.)
- Published
- 2022
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