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Bucher M, Endesfelder D, Roessler U, Borkhardt A, Dückers G, Kirlum HJ, Lankisch P, Oommen PT, Niehues T, Rübe CE, Baumgartner I, Bunk F, Moertl S, Hornhardt S, Gomolka M. Analysis of chromosomal aberrations and γH2A.X foci to identify radiation-sensitive ataxia-telangiectasia patients. Mutat Res 2020; 861-862:503301. [PMID: 33551102 DOI: 10.1016/j.mrgentox.2020.503301] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 11/27/2020] [Accepted: 12/02/2020] [Indexed: 01/08/2023]
Abstract
Ataxia-telangiectasia (AT) is a rare inherited recessive disorder which is caused by a mutated Ataxia-telangiectasia mutated (ATM) gene. Hallmarks include chromosomal instability, cancer predisposition and increased sensitivity to ionizing radiation. The ATM protein plays an important role in signaling of DNA double-strand breaks (DSB), thereby phosphorylating the histone H2A.X. Non-functional ATM protein leads to defects in DNA damage response, unresolved DSBs and genomic instability. The aim of this study was to evaluate chromosomal aberrations and γH2A.X foci as potential radiation sensitivity biomarkers in AT patients. For this purpose, lymphocytes of 8 AT patients and 10 healthy controls were irradiated and induced DNA damage and DNA repair capacity were detected by the accumulation of γH2A.X foci. The results were heterogeneous among AT patients. Evaluation revealed 2 AT patients with similar γH2A.X foci numbers as controls after 1 h while 3 patients showed a lower induction. In regard to DNA repair, 3 of 5 AT patients showed poor damage repair. Therefore, DNA damage induction and DNA repair as detected by H2A.X phosphorylation revealed individual differences, seems to depend on the underlying individual mutation and thus appears not well suited as a biomarker for radiation sensitivity. In addition, chromosomal aberrations were analyzed by mFISH. An increased frequency of spontaneous chromosomal breakage was characteristic for AT cells. After irradiation, significantly increased rates for non-exchange aberrations, translocations, complex aberrations and dicentric chromosomes were observed in AT patients compared to controls. The results of this study suggested, that complex aberrations and dicentric chromosomes might be a reliable biomarker for radiation sensitivity in AT patients, while non-exchange aberrations and translocations identified both, spontaneous and radiation-induced chromosomal instability.
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Affiliation(s)
- Martin Bucher
- Department of Effects and Risks of Ionising and Non-Ionising Radiation, Federal Office for Radiation Protection, Ingolstädter Landstraße 1, 85764, Oberschleißheim, Germany.
| | - David Endesfelder
- Department of Effects and Risks of Ionising and Non-Ionising Radiation, Federal Office for Radiation Protection, Ingolstädter Landstraße 1, 85764, Oberschleißheim, Germany
| | - Ute Roessler
- Department of Effects and Risks of Ionising and Non-Ionising Radiation, Federal Office for Radiation Protection, Ingolstädter Landstraße 1, 85764, Oberschleißheim, Germany
| | - Arndt Borkhardt
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center for Child and Adolescent Health, Heinrich Heine University Düsseldorf, Moorenstraße 5, 40225, Dusseldorf, Germany
| | - Gregor Dückers
- Center for Child and Adolescent Health, HELIOS Hospital Krefeld, Lutherplatz 40, 47805, Krefeld, Germany
| | - Hans-Joachim Kirlum
- Pediatric Surgery and Pediatric Orthopedics in der Au, Kühbachstraße 1, 81543, Munich, Germany
| | - Petra Lankisch
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center for Child and Adolescent Health, Heinrich Heine University Düsseldorf, Moorenstraße 5, 40225, Dusseldorf, Germany
| | - Prasad T Oommen
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center for Child and Adolescent Health, Heinrich Heine University Düsseldorf, Moorenstraße 5, 40225, Dusseldorf, Germany
| | - Tim Niehues
- Center for Child and Adolescent Health, HELIOS Hospital Krefeld, Lutherplatz 40, 47805, Krefeld, Germany
| | - Claudia E Rübe
- Department of Radiotherapy and Radiation Oncology, Saarland University Hospital and Saarland University Faculty of Medicine, Kirrberger Straße, Building 6.5, 66421, Homburg/Saar, Germany
| | - Ingrid Baumgartner
- Department of Effects and Risks of Ionising and Non-Ionising Radiation, Federal Office for Radiation Protection, Ingolstädter Landstraße 1, 85764, Oberschleißheim, Germany
| | - Frank Bunk
- Department of Effects and Risks of Ionising and Non-Ionising Radiation, Federal Office for Radiation Protection, Ingolstädter Landstraße 1, 85764, Oberschleißheim, Germany
| | - Simone Moertl
- Department of Effects and Risks of Ionising and Non-Ionising Radiation, Federal Office for Radiation Protection, Ingolstädter Landstraße 1, 85764, Oberschleißheim, Germany
| | - Sabine Hornhardt
- Department of Effects and Risks of Ionising and Non-Ionising Radiation, Federal Office for Radiation Protection, Ingolstädter Landstraße 1, 85764, Oberschleißheim, Germany
| | - Maria Gomolka
- Department of Effects and Risks of Ionising and Non-Ionising Radiation, Federal Office for Radiation Protection, Ingolstädter Landstraße 1, 85764, Oberschleißheim, Germany
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