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Discovery links rare, childhood neurodegenerative diseases to common problem in DNA repair
Date:5/9/2014

riods of rapid brain development and in response to radiation, oxidation and other factors known to cause breaks in DNA.

When researchers knocked out both Atm and Tdp1, Top1cc accumulation rose substantially as did a form of programmed cell death called apoptosis. Investigators reported that apoptosis was concentrated in the developing brain and few mice survived to birth. McKinnon said the results add to evidence that the brain is particularly sensitive to DNA damage.

Researchers then used the anti-cancer drug topotecan to link elevated levels of Top1cc to the cell death and other problems seen in mice lacking Atm and Tdp1. Topotecan works by trapping Top1ccs in tumor cells, resulting in the DNA damage that triggers apoptosis. Investigators showed that the impact of Top1cc accumulation was strikingly similar whether the cause was topotecan or the loss of Atm and Tdp1.


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Contact: Carrie Strehlau
carrie.strehlau@stjude.org
901-595-2295
St. Jude Children's Research Hospital
Source:Eurekalert

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