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DNA repair during organogenesis
Robert K Vinson1, Barbara F Hales
1Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Montreal, Que., Canada H3G-1Y6.
Abstract:
DNA damage caused by genotoxic agents can impact on virtually any cellular process due to its ability to affect gene expression and subsequent gene products. The importance of repairing damaged DNA is evidenced by the variety of DNA repair pathways that have evolved in all living organisms, and the human syndromes caused by a lack of this repair ability. This review focuses on the expression and activity of DNA repair pathways during mammalian organogenesis, and the role of these pathways in ensuring the stability of the conceptal genome. DNA repair capacity may play a role also in the response of the conceptus to genotoxic agents that may induce malformations; the consequences of exposure to a genotoxic agent during organogenesis depend on the extent of the damage and on the ability of the embryo to respond by repairing DNA or arresting cell division. The four main repair pathways (nucleotide excision repair, base excision repair, mismatch repair, and recombination repair) are expressed to various degrees during organogenesis, as are members of the genotoxic stress-activated cell cycle checkpoint pathways. Developmental-stage-specific alterations in transcript levels, protein levels, as well as activity, indicate that the regulation of DNA repair pathways during development is complex. The importance of DNA repair pathways in endogenous damage control is illustrated by the sensitivity of development to their disruption if some of these genes are mutated. Furthermore, the conceptus has a limited capacity to alter DNA repair responses following exposure to genotoxic agents.
Insights
DNA repair pathways are crucial for maintaining genomic stability during mammalian organogenesis. Their complex regulation and developmental stage-specific expression highlight their importance in preventing malformations from genotoxic damage.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Genotoxic agents can damage DNA, impacting cellular processes and gene expression.
- DNA repair pathways are essential for maintaining genomic integrity, with defects leading to human syndromes.
- Understanding DNA repair during development is critical for preventing congenital abnormalities.
Purpose of the Study:
- To review the expression and activity of DNA repair pathways during mammalian organogenesis.
- To explore the role of DNA repair in the conceptus's response to genotoxic agents.
- To examine the regulation and importance of DNA repair during embryonic development.
Main Methods:
- Review of scientific literature on DNA repair pathways and mammalian organogenesis.
- Analysis of gene expression, protein levels, and activity of repair pathways during development.
- Examination of cell cycle checkpoint pathways activated by genotoxic stress.
Main Results:
- Key DNA repair pathways (nucleotide excision repair, base excision repair, mismatch repair, recombination repair) are expressed during organogenesis.
- Genotoxic stress-activated cell cycle checkpoint pathways are also present.
- Developmental-stage-specific alterations in DNA repair pathway expression and activity indicate complex regulation.
- Disruption of DNA repair pathways significantly impacts development, demonstrating their critical role.
Conclusions:
- DNA repair pathways are vital for genomic stability during mammalian organogenesis.
- The conceptus has a limited ability to modify DNA repair responses to genotoxic agents.
- Proper functioning of DNA repair is essential for normal embryonic development and preventing malformations.