Early embryonic lethality in PARP-1 Atm double-mutant mice suggests a functional synergy in cell proliferation during development.
PARP-1 and ATM are both involved in the response to DNA strand breaks, resulting in induction of a signaling network responsible for DNA surveillance, cellular recovery, and cell survival. ATM interacts with double-strand break repair pathways and induces signals resulting in the control of the cell cycle-coupled checkpoints. PARP-1 acts as a DNA break sensor in the base excision repair pathway of DNA. Mice with mutations inactivating either protein show radiosensitivity and high radiation-induced chromosomal aberration frequencies. Embryos carrying double mutations of both PARP-1 and Atm genes were generated. These mutant embryos show apoptosis in the embryo but not in extraembryonic tissues and die at embryonic day 8.0, although extraembryonic tissues appear normal for up to 10.5 days of gestation. These results reveal a functional synergy between PARP-1 and ATM during a period of embryogenesis when cell cycle checkpoints are not active and the embryo is particularly sensitive to DNA damage. These results suggest that ATM and PARP-1 have synergistic phenotypes due to the effects of these proteins on signaling DNA damage and/or on distinct pathways of DNA repair.
Ecole Supérieure de Biotechnologie de Strasbourg, UPR 9003 du CNRS, Cancérogenèse et Mutagenèse Moléculaire et Structurale, 67400 Illkirch Cedex, France. josiane@esbs.u-strasbg.fr
J
J
Ménisser-de Murcia
M
M
Mark
O
O
Wendling
A
A
Wynshaw-Boris
G
G
de Murcia
D000818:Animals; D017209:Apoptosis; D064007:Ataxia Telangiectasia Mutated Proteins; D002453:Cell Cycle; D018797:Cell Cycle Proteins; D016923:Cell Death; D002455:Cell Division; D002470:Cell Survival; D002869:Chromosome Aberrations; D004249:DNA Damage; D004260:DNA Repair; D004268:DNA-Binding Proteins; D004622:Embryo, Mammalian / Q000378:metabolism; D005838:Genotype; D006579:Heterozygote; D051379:Mice; D008854:Microscopy, Electron; D008954:Models, Biological; D009154:Mutation; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases; D016133:Polymerase Chain Reaction; D017346:Protein Serine-Threonine Kinases / Q000235:genetics* / Q000502:physiology*; D011506:Proteins / Q000235:genetics* / Q000502:physiology*; D011836:Radiation Tolerance; D015398:Signal Transduction; D013997:Time Factors; D025521:Tumor Suppressor Proteins
D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D011506:Proteins; D025521:Tumor Suppressor Proteins; C499321:Parp1 protein, mouse; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases; D064007:Ataxia Telangiectasia Mutated Proteins; C576325:Atm protein, mouse; D017346:Protein Serine-Threonine Kinases