Localization microscopy analyses of MRE11 clusters in 3D-conserved cell nuclei of different cell lines
In radiation biophysics, it is a subject of nowadays research to investigate DNA strand break repair in detail after damage induction by ionizing radiation. It is a subject of debate as to what makes up the cell’s decision to use a certain repair pathway and how the repair machinery recruited in rep...
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| Main Authors: | , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
22 January 2018
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| In: |
Cancers
Year: 2018, Volume: 10, Issue: 1 |
| ISSN: | 2072-6694 |
| DOI: | 10.3390/cancers10010025 |
| Online Access: | Verlag, Volltext: https://doi.org/10.3390/cancers10010025 Verlag, Volltext: https://www.mdpi.com/2072-6694/10/1/25 
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| Author Notes: | Marion Eryilmaz, Eberhard Schmitt, Matthias Krufczik, Franziska Theda, Jin-Ho Lee, Christoph Cremer, Felix Bestvater, Wladimir Schaufler, Michael Hausmann and Georg Hildenbrand |
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| 245 | 1 | 0 | |a Localization microscopy analyses of MRE11 clusters in 3D-conserved cell nuclei of different cell lines |c Marion Eryilmaz, Eberhard Schmitt, Matthias Krufczik, Franziska Theda, Jin-Ho Lee, Christoph Cremer, Felix Bestvater, Wladimir Schaufler, Michael Hausmann and Georg Hildenbrand |
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| 520 | |a In radiation biophysics, it is a subject of nowadays research to investigate DNA strand break repair in detail after damage induction by ionizing radiation. It is a subject of debate as to what makes up the cell’s decision to use a certain repair pathway and how the repair machinery recruited in repair foci is spatially and temporarily organized. Single-molecule localization microscopy (SMLM) allows super-resolution analysis by precise localization of single fluorescent molecule tags, resulting in nuclear structure analysis with a spatial resolution in the 10 nm regime. Here, we used SMLM to study MRE11 foci. MRE11 is one of three proteins involved in the MRN-complex (MRE11-RAD50-NBS1 complex), a prominent DNA strand resection and broken end bridging component involved in homologous recombination repair (HRR) and alternative non-homologous end joining (a-NHEJ). We analyzed the spatial arrangements of antibody-labelled MRE11 proteins in the nuclei of a breast cancer and a skin fibroblast cell line along a time-course of repair (up to 48 h) after irradiation with a dose of 2 Gy. Different kinetics for cluster formation and relaxation were determined. Changes in the internal nano-scaled structure of the clusters were quantified and compared between the two cell types. The results indicate a cell type-dependent DNA damage response concerning MRE11 recruitment and cluster formation. The MRE11 data were compared to H2AX phosphorylation detected by γH2AX molecule distribution. These data suggested modulations of MRE11 signal frequencies that were not directly correlated to DNA damage induction. The application of SMLM in radiation biophysics offers new possibilities to investigate spatial foci organization after DNA damaging and during subsequent repair. | ||
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