MRE11 and H2AX biomarkers in the response to low-dose exposure: Balance between individual susceptibility to radiosensitivity and to genomic instability

C. Colin, A. Granzotto, C. Devic, C. Massart, M. Viau, G. Vogin, M. Maalouf, A. Joubert, N. Foray*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

19 Citations (Scopus)

Abstract

Unrepaired and misrepaired DNA Double-Strand Breaks (DSBs) were shown to be the key events of radiation-induced toxicity (radiosensitivity) and genomic instability (cancer proneness), respectively. We have previously shown that immunofluorescence with γ-H2AX and MRE11 biomarkers may account for unrepaired and misrepaired DSBs for doses higher than 1 Gy. Three radiosensitivity groups had been defined (group I: radioresistance; group II: moderate radiosensitivity and cancer proneness; group III: hyperradiosensitivity). Here, we investigated X-ray doses ranging from 9 mGy to 2 Gy in three cell lines representative of these radiosensitivity groups. We observed a non-linear dose-dependent increase of the severity of DSB, suggesting a correlation with the phenomenon of hyper-radiosensitivity to low dose; a non-linear dose-dependent increase of MRE11 foci, revealing a dosethreshold for the radiation-induced genomic instability. Altogether, these data document the evidence of a threshold in low-dose response and strongly suggest the impact of individual factor.

Original languageEnglish
Pages (from-to)96-106
Number of pages11
JournalInternational Journal of Low Radiation
Volume8
Issue number2
DOIs
Publication statusPublished - Dec 2011
Externally publishedYes

Keywords

  • DSB repair
  • MRE11
  • γ-H2AX

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