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1 May 2002 DNA-PK and ATM are Required for Radiation-Enhanced Integration
Yoshinori Nimura, Sheikh M. Ismail, Akihiro Kurimas, David J. Chen, Craig W. Stevens
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Nimura, Y., Ismail, S. M., Chen, D. J. and Stevens, C. W. DNA-PK and ATM are Required for Radiation-Enhanced Integration. Radiat. Res. 157, 562–567 (2002).

Ionizing radiation is known to improve transfection of exogenous DNA, a process we have termed radiation-enhanced integration. Previous observations have demonstrated that Ku proteins are critical for radiation-enhanced integration. Since Ku proteins form the DNA-binding domain of DNA-PK and since DNA-PK is important in nonhomologous DNA end joining, it was hypothesized that DNA-PK function might be important for radiation-enhanced integration. The ATM protein has been shown to be important in the recognition of a variety of types of DNA damage and to associate with DNA-PK under certain conditions. It was thus hypothesized that ATM might also play a role in radiation-enhanced integration. To test these hypotheses, radiation-enhanced integration was measured in hamster cells that are defective in the catalytic subunit of DNA-PK and in human cells containing mutant ATM. Radiation-enhanced integration was not detected in any of the cell lines with mutant PRKDC (also known as DNA-PKcs), but it was present in cells of the same lineage with wild-type PRKDC. Radiation-enhanced integration was defective in cells lacking kinase activation. ATM-deficient cell lines also showed defective radiation-enhanced integration. These data demonstrate that DNA-PK and ATM must both be active for radiation-enhanced integration to be observed.

Yoshinori Nimura, Sheikh M. Ismail, Akihiro Kurimas, David J. Chen, and Craig W. Stevens "DNA-PK and ATM are Required for Radiation-Enhanced Integration," Radiation Research 157(5), 562-567, (1 May 2002).[0562:DPAAAR]2.0.CO;2
Received: 27 April 2001; Accepted: 1 January 2002; Published: 1 May 2002
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