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00925njm 22002777a 4500 dc Murga, Matilde author Bunting, Samuel author Montaña, Maria F author Soria, Rebeca author Mulero, Francisca author Cañamero, Marta author Lee, Youngsoo author McKinnon, Peter J author Nussenzweig, Andre author Fernandez-Capetillo, Oscar author 2009-08 Although DNA damage is considered a driving force for aging, the nature of the damage that arises endogenously remains unclear. Replicative stress, a source of endogenous DNA damage, is prevented primarily by the ATR kinase. We have developed a mouse model of Seckel syndrome characterized by a severe deficiency in ATR. Seckel mice show high levels of replicative stress during embryogenesis, when proliferation is widespread, but this is reduced to marginal amounts in postnatal life. In spite of this decrease, adult Seckel mice show accelerated aging, which is further aggravated in the absence of p53. Together, these results support a model whereby replicative stress, particularly in utero, contributes to the onset of aging in postnatal life, and this is balanced by the replicative stress-limiting role of the checkpoint proteins ATR and p53. Nat Genet . 2009;41(8):891-8. 10.1038/ng.420 1546-1718 Nature genetics https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2902278/ 19620979 http://hdl.handle.net/20.500.12105/17685 A mouse model of ATR-Seckel shows embryonic replicative stress and accelerated aging.