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Updated: May 12, 2026
Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
Published on: August 21, 2021
The response to DNA damage during differentiation: pathways and consequences
Paola Fortini1, Chiara Ferretti1, Eugenia Dogliotti1
1Department of Environment and Primary Prevention, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
Abstract:
Damage to genomic DNA triggers a prompt set of signaling events known as the DNA damage response (DDR) which coordinates DNA repair, cell cycle arrest and ultimately cell death or senescence. Although activation of adequate DNA damage signaling and repair systems depends on the type of lesion and the cell-cycle phase in which it occurs, emerging evidence indicates that DNA repair and DDR function differently in different cellular contexts. Depending on the time maintenance and function of a specific cell type the risk of accumulating DNA damage may vary. For instance, damage to stem cells if not repaired can lead to mutation amplification or propagation through the processes of self-renewal and differentiation, respectively, whereas damage to post-mitotic cells can affect mostly tissue homeostasis. Stem cells are therefore expected to address DNA damage differently from their somatic counterparts. In this review the information available on the common and distinct mechanisms of control of genome integrity utilized by different cell types along the self-renewal/differentiation program will be reviewed, with special emphasis on their roles in the prevention of aging and disease.
Insights
The DNA damage response (DDR) coordinates DNA repair, but its function varies by cell type. This review explores how stem cells and somatic cells differ in maintaining genome integrity, impacting aging and disease prevention.
Area of Science:
- Genomics
- Cell Biology
- Molecular Biology
Background:
- Genomic DNA damage triggers the DNA damage response (DDR), involving repair, cell cycle arrest, and cell death/senescence.
- DDR and DNA repair mechanisms are influenced by lesion type and cell-cycle phase.
- Cellular context significantly impacts DNA repair and DDR functionality.
Purpose of the Study:
- To review common and distinct mechanisms of genome integrity control across different cell types.
- To emphasize the roles of these mechanisms in preventing aging and disease.
- To explore how self-renewal and differentiation programs influence DNA damage management.
Main Methods:
- Literature review of existing research on DNA damage response and repair.
- Comparative analysis of DDR mechanisms in stem cells versus somatic cells.
- Focus on cell-type-specific strategies for maintaining genome integrity.
Main Results:
- DNA damage risk and repair strategies vary based on cell type and its function.
- Stem cells and post-mitotic cells exhibit distinct approaches to DNA damage.
- Differences in DNA repair can lead to mutation amplification in stem cells or affect tissue homeostasis in post-mitotic cells.
Conclusions:
- Understanding cell-type-specific genome maintenance is crucial for preventing aging and disease.
- Stem cells employ unique DDR mechanisms due to their self-renewal and differentiation potential.
- Differential DNA repair strategies highlight the adaptability of cellular systems to maintain genomic stability.
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