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Science. 1998 Apr 24;280(5363):590-2.

In situ visualization of DNA double-strand break repair in human fibroblasts.

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Laboratory of Genetics and Department of Medical Physics, University of Wisconsin Medical School, Madison, WI 53706, USA.


A method was developed to examine DNA repair within the intact cell. Ultrasoft x-rays were used to induce DNA double-strand breaks (DSBs) in defined subnuclear volumes of human fibroblasts and DNA repair was visualized at those sites. The DSBs remained in a fixed position during the initial stages of DNA repair, and the DSB repair protein hMre11 migrated to the sites of damage within 30 minutes. In contrast, hRad51, a human RecA homolog, did not localize at sites of DNA damage, a finding consistent with the distinct roles of these proteins in DNA repair.

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