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Scientists track impact of DNA damage in the developing brain
Date:7/27/2009

s, were poised to complete differentiation. In those cells, McKinnon said, loss of Xrcc1 activated the p53 pathway and blocked the cells from completing the cell cycle. "The cells appear to undergo permanent arrest," said McKinnon, noting it is one of the few in vivo examples of the p53 pathway leading to cell cycle arrest rather than apoptosis.

In the hippocampus, which plays a role in memory and emotion, investigators reported abnormal gene expression and neuronal function. Some neurons were eventually replaced by scar tissue in a process known as gliosis. Overall changes in the hippocampus mimicked those found in the brains of adults with the seizure disorder known as temporal lobe epilepsy. In this study, the loss of Xrcc1 also resulted in seizures in mice.


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Contact: Summer Freeman
summer.freeman@stjude.org
901-595-3061
St. Jude Children's Research Hospital
Source:Eurekalert

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