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The molecular control of DNA damage-induced cell death
1The Walter and Eliza Hall Institute, Melbourne, Vic, Australia.
Abstract:
Because of the singular importance of DNA for genetic inheritance, all organisms have evolved mechanisms to recognize and respond to DNA damage. In metazoans, cells can respond to DNA damage either by undergoing cell cycle arrest, to facilitate DNA repair, or by undergoing cell suicide. Cell death can either occur by activation of the apoptotic machinery or simply be a consequence of irreparable damage that prevents further cell division. In germ cells, mechanisms for limiting alterations to the genome are required for faithful propagation of the species whereas in somatic cells, responses to DNA damage prevent the accumulation of mutations that might lead to aberrant cell proliferation or behavior. Several of the genes that regulate cellular responses to DNA damage function as tumor suppressors. The clinical use of DNA damaging agents in the treatment of cancer can activate these tumor suppressors and exploits the cellular suicide and growth arrest mechanisms that they regulate. It appears that in some but not all types of tumors the propensity to undergo apoptosis is a critical determinant of their sensitivity to anti-cancer therapy. This review describes current understanding of the molecular control of DNA damage-induced apoptosis with particular attention to its role in tumor suppression and cancer therapy.
Insights
Organisms detect and repair DNA damage. This review explores how DNA damage triggers apoptosis, its role in tumor suppression, and cancer treatment sensitivity.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- DNA damage recognition and response are crucial for all organisms.
- Metazoan cells manage DNA damage via cell cycle arrest or cell death (apoptosis or irreparable damage consequences).
- Germ cells ensure genome integrity for species propagation, while somatic cells prevent mutations causing aberrant proliferation.
Purpose of the Study:
- To review the molecular control of DNA damage-induced apoptosis.
- To highlight the role of DNA damage response in tumor suppression.
- To discuss the implications for cancer therapy sensitivity.
Main Methods:
- Literature review of molecular mechanisms controlling DNA damage-induced apoptosis.
- Analysis of the function of DNA damage response genes as tumor suppressors.
- Examination of the link between apoptosis propensity and anti-cancer therapy efficacy.
Main Results:
- Genes regulating DNA damage response often act as tumor suppressors.
- Cancer therapies utilizing DNA damaging agents can activate these tumor suppressors.
- Tumor apoptosis propensity is a critical determinant of sensitivity to anti-cancer therapy in some cancers.
Conclusions:
- Understanding DNA damage-induced apoptosis is key to tumor suppression.
- Targeting apoptosis pathways offers potential for improved cancer treatment strategies.
- Cellular suicide and growth arrest mechanisms regulated by tumor suppressors are exploited in cancer therapy.