Abstract
The central dogma in radiation biology is that nuclear DNA is the critical target with respect to radiosensitivity. In accordance with the theoretical expectations, and in the absence of a conclusive model, the general consensus in the field has been to view chromatin as a homogeneous template for DNA damage and repair. This paradigm has been called into question by recent findings indicating a disparity in gamma-irradiation-induced gammaH2AX foci formation in euchromatin and heterochromatin. Here, we have extended those studies and provide evidence that gammaH2AX foci form preferentially in actively transcribing euchromatin following gamma-irradiation.
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