Homologous and non-homologous recombination differentially affect DNA damage repair in mice
AUTOR(ES)
Essers, Jeroen
FONTE
Oxford University Press
RESUMO
Ionizing radiation and interstrand DNA crosslinking compounds provide important treatments against cancer due to their extreme genotoxicity for proliferating cells. Both the efficacies of such treatments and the mutagenic potential of these agents are modulated by the ability of cells to repair the inflicted DNA damage. Here we demonstrate that homologous recombination-deficient mRAD54–/– mice are hypersensitive to ionizing radiation at the embryonic but, unexpectedly, not at the adult stage. However, at the adult stage mRAD54 deficiency dramatically aggravates the ionizing radiation sensitivity of severe combined immune deficiency (scid) mice that are impaired in DNA double-strand break repair through DNA end-joining. In contrast, regardless of developmental stage, mRAD54–/– mice are hypersensitive to the interstrand DNA crosslinking compound mitomycin C. These results demonstrate that the two major DNA double-strand break repair pathways in mammals have overlapping as well as specialized roles, and that the relative contribution of these pathways towards repair of ionizing radiation-induced DNA damage changes during development of the animal.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=310238Documentos Relacionados
- Compilation of DNA strand exchange sites for non-homologous recombination in somatic cells.
- DNA synthesis on discontinuous templates by human DNA polymerases: implications for non-homologous DNA recombination.
- Role of ERCC1 in removal of long non-homologous tails during targeted homologous recombination
- Non-Homologous Pairing and Crossing over in Drosophila Melanogaster
- Non-homologous recombination mediated by Thermus aquaticus DNA polymerase I. Evidence supporting a copy choice mechanism.