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• W2134920248 abstract "DNA repair plays a critical, but imprecisely defined role in neuronal survival during cortical neurogenesis. We examined cortical development in mice deficient for the DNA end-joining protein, Ku70. At gestational day 14.5, corresponding to the peak of neurogenesis, the Ku70−/− embryonic cerebral cortex displayed 25- to 30-fold more cell death than heterozygous littermates, as judged by DNA breaks, pyknosis and active caspase-3. In Ku70−/− embryos only, large clusters of dying neurons were found in the intermediate zone. Cell death declined until P4, when the number of dying cells became comparable to that in heterozygous mice. Two groups of dying cells were evident: a GLAST+ neural progenitor population in the subventricular and ventricular zones, and a doublecortin+ immature neuron population in the intermediate zone, the latter exhibiting strong staining for oxidative DNA damage. Antioxidants and lower oxygen tension reduced the high levels of neuronal death in primary cortical cultures derived from Ku70−/− mice, but not the low levels of cell death in wildtype cortical cultures. Results indicate migrating cortical neurons undergo oxidative DNA damage, which is normally repaired by non-homologous end joining. Failure to repair oxidative damage triggers a form of apoptosis involving caspase-3 activation." @default.
• W2134920248 created "2016-06-24" @default.
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• W2134920248 date "2004-09-01" @default.
• W2134920248 modified "2023-09-27" @default.
• W2134920248 title "Oxidative Damage and Defective DNA Repair is Linked to Apoptosis of Migrating Neurons and Progenitors During Cerebral Cortex Development in Ku70-Deficient Mice" @default.
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• W2134920248 doi "https://doi.org/10.1093/cercor/bhh171" @default.
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