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Validation of a flow cytometry‐based detection of γ‐H2AX, to measure DNA damage for clinical applications
Author(s) -
Johansson Pegah,
Fasth Anders,
Ek Torben,
Hammarsten Ola
Publication year - 2017
Publication title -
cytometry part b: clinical cytometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 61
eISSN - 1552-4957
pISSN - 1552-4949
DOI - 10.1002/cyto.b.21374
Subject(s) - dna damage , flow cytometry , dna repair , dna , peripheral blood mononuclear cell , cytometry , histone , biomarker , ataxia telangiectasia , microbiology and biotechnology , cancer research , ionizing radiation , biology , genetics , in vitro , irradiation , physics , nuclear physics
Background The nucleosomal histone protein H2AX is specifically phosphorylated (γ‐H2AX) adjacent to DNA double‐strand breaks (DSBs) and is used for quantifying DSBs. Many chemotherapies and ionizing radiation (IR) used in cancer treatment result in DSBs. Therefore, γ‐H2AX has a significant potential as a biomarker in evaluating patient sensitivity and responsiveness to IR and chemotherapy. Methods Here, we report a flow cytometry‐based quantification of γ‐H2AX (FCM‐γ‐H2AX assay) customized for clinical practice. Results We validated that our method is able to detect DNA damage in peripheral blood mononuclear cells (PBMCs) treated with DSB inducing agents. The method also detected the DNA repair deficiency in PBMCs treated with DNA repair inhibitors, as well as the deficiency in DNA repair signaling in PBMCs from two ataxia telangiectasia patients. Conclusions The FCM‐γ‐H2AX assay has sufficient analytical sensitivity and precision to measure levels of DNA damage and DNA repair for clinical purposes. © 2016 International Clinical Cytometry Society