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. 1997 Oct;17(10):6087–6096. doi: 10.1128/mcb.17.10.6087

hMre11 and hRad50 nuclear foci are induced during the normal cellular response to DNA double-strand breaks.

R S Maser 1, K J Monsen 1, B E Nelms 1, J H Petrini 1
PMCID: PMC232458  PMID: 9315668

Abstract

We previously identified a conserved multiprotein complex that includes hMre11 and hRad50. In this study, we used immunofluorescence to investigate the role of this complex in DNA double-strand break (DSB) repair. hMre11 and hRad50 form discrete nuclear foci in response to treatment with DSB-inducing agents but not in response to UV irradiation. hMre11 and hRad50 foci colocalize after treatment with ionizing radiation and are distinct from those of the DSB repair protein, hRad51. Our data indicate that an irradiated cell is competent to form either hMre11-hRad50 foci or hRad51 foci, but not both. The multiplicity of hMre11 and hRad50 foci is much higher in the DSB repair-deficient cell line 180BR than in repair-proficient cells. hMre11-hRad50 focus formation is markedly reduced in cells derived from ataxia-telangiectasia patients, whereas hRad51 focus formation is markedly increased. These experiments support genetic evidence from Saccharomyces cerevisiae indicating that Mre11-Rad50 have roles distinct from that of Rad51 in DSB repair. Further, these data indicate that hMre11-hRad50 foci form in response to DNA DSBs and are dependent upon a DNA damage-induced signaling pathway.

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Selected References

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