Abstract
DNA damage is one of the foremost mechanisms of irradiation at the biological level. After the first isolation of DNA by Friedrich Miescher in the 19th century, the structure of DNA was described by Watson and Crick. Several Nobel Prizes have been awarded for DNA-related discoveries. This review aims to describe the historical perspective of DNA in radiation biology. Over the decades, DNA damage has been identified and quantified after irradiation. Depending on the type of sensing, different proteins are involved in sensing DNA damage and repairing the damage, if possible. For double-strand breaks, the main repair mechanisms are non-homologous end joining and homologous recombination. Additional mechanisms are the Fanconi anaemia pathway and base excision repair. Different methods have been developed for the detection of DNA double-strand breaks. Several drugs have been developed that interfere with different DNA repair mechanisms, e.g., PARP inhibitors. These drugs have been established in the standard treatment of different tumour entities and are being applied in several clinical trials in combination with radiotherapy. Over the past decades, it has become apparent that DNA damage mechanisms are also directly linked to the immune response in tumours. For example, cytosolic DNA fragments activate the innate immune system via the cGAS STING pathway.
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Acknowledgements
We gratefully acknowledge intense and fruitful discussions with Prof. Christian Streffer, Medical School, University Hospital Essen. The pictures in Fig. 1 were kindly provided by the Museum of the University of Tübingen (MUT).
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F. Eckert has received speaker’s honoraria and travel grants from Dr. Sennewald GmbH. B. Frey, K. Borgmann, T. Jost, B. Greve, M. Oertel, and O. Micke declare that they have no competing interests.
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The authors Benjamin Frey and Kerstin Borgmann contributed equally to the manuscript.
This work was conceptualized and partly written by the history working group of the German Radiation Oncology Society (DEGRO).
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Frey, B., Borgmann, K., Jost, T. et al. DNA as the main target in radiotherapy—a historical overview from first isolation to anti-tumour immune response. Strahlenther Onkol 199, 1080–1090 (2023). https://doi.org/10.1007/s00066-023-02122-5
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DOI: https://doi.org/10.1007/s00066-023-02122-5