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a la rencontre des orchidées sauvages de rhône-alpes INT6/EIF3E interacts with ATM and is required for proper execution of the DNA damage response in human cells.

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paru vendu 33 rencontre Cancer Res, 72(8):2006-16.

rencontre celibataire cambrai Altered expression of the INT6 gene, encoding the e subunit of the translationalinitiation factor eIF3, occurs in human breast cancers, but how INT6 relates to carcinogenesis remains unestablished. Here, we show that INT6 is involved in theDNA damage response. INT6 was required for cell survival following gamma-irradiation and G(2)-M checkpoint control. RNA interference-mediated silencing of INT6 reduced phosphorylation of the checkpoint kinases CHK1 and CHK2 after DNA damage. In addition, INT6 silencing prevented sustained accumulation of ataxia telangiectasia mutated (ATM) at DNA damage sites in cells treated with gamma-radiation or the radiomimetic drug neocarzinostatin. Mechanistically, thisresult could be explained by interaction of INT6 with ATM, which together with INT6 was recruited to the sites of DNA damage. Finally, INT6 silencing also reduced ubiquitylation events that promote retention of repair proteins at DNA lesions. Accordingly, accumulation of the repair factor BRCA1 was defective in the absence of INT6. Our findings reveal unexpected and striking connections of INT6 with ATM and BRCA1 and suggest that the protective action of INT6 in the onset of breast cancers relies on its involvement in the DNA damage response.

 
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