Recruitment of 53BP1 proteins for DNA repair and persistence of repair clusters differ for cell types as detected by single molecule localization microscopy
DNA double stranded breaks (DSBs) are the most serious type of lesions introduced into chromatin by ionizing radiation. During DSB repair, cells recruit different proteins to the damaged sites in a manner dependent on local chromatin structure, DSB location in the nucleus, and the repair pathway ent...
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
22 November 2018
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| In: |
International journal of molecular sciences
Year: 2018, Volume: 19, Issue: 12 |
| ISSN: | 1422-0067 |
| DOI: | 10.3390/ijms19123713 |
| Online Access: | Verlag, Volltext: https://doi.org/10.3390/ijms19123713 Verlag: https://www.mdpi.com/1422-0067/19/12/3713 
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| Author Notes: | Elizaveta Bobkova, Daniel Depes, Jin-Ho Lee, Lucie Jezkova, Iva Falkova, Eva Pagacova, Olga Kopecna, Mariia Zadneprianetc, Alena Bacikova, Elena Kulikova, Elena Smirnova, Tatiana Bulanova, Alla Boreyko, Evgeny Krasavin, Frederik Wenz, Felix Bestvater, Georg Hildenbrand, Michael Hausmann and Martin Falk |
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| 245 | 1 | 0 | |a Recruitment of 53BP1 proteins for DNA repair and persistence of repair clusters differ for cell types as detected by single molecule localization microscopy |c Elizaveta Bobkova, Daniel Depes, Jin-Ho Lee, Lucie Jezkova, Iva Falkova, Eva Pagacova, Olga Kopecna, Mariia Zadneprianetc, Alena Bacikova, Elena Kulikova, Elena Smirnova, Tatiana Bulanova, Alla Boreyko, Evgeny Krasavin, Frederik Wenz, Felix Bestvater, Georg Hildenbrand, Michael Hausmann and Martin Falk |
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| 520 | |a DNA double stranded breaks (DSBs) are the most serious type of lesions introduced into chromatin by ionizing radiation. During DSB repair, cells recruit different proteins to the damaged sites in a manner dependent on local chromatin structure, DSB location in the nucleus, and the repair pathway entered. 53BP1 is one of the important players participating in repair pathway decision of the cell. Although many molecular biology details have been investigated, the architecture of 53BP1 repair foci and its development during the post-irradiation time, especially the period of protein recruitment, remains to be elucidated. Super-resolution light microscopy is a powerful new tool to approach such studies in 3D-conserved cell nuclei. Recently, we demonstrated the applicability of single molecule localization microscopy (SMLM) as one of these highly resolving methods for analyses of dynamic repair protein distribution and repair focus internal nano-architecture in intact cell nuclei. In the present study, we focused our investigation on 53BP1 foci in differently radio-resistant cell types, moderately radio-resistant neonatal human dermal fibroblasts (NHDF) and highly radio-resistant U87 glioblastoma cells, exposed to high-LET 15N-ion radiation. At given time points up to 24 h post irradiation with doses of 1.3 Gy and 4.0 Gy, the coordinates and spatial distribution of fluorescently tagged 53BP1 molecules was quantitatively evaluated at the resolution of 10–20 nm. Clusters of these tags were determined as sub-units of repair foci according to SMLM parameters. The formation and relaxation of such clusters was studied. The higher dose generated sufficient numbers of DNA breaks to compare the post-irradiation dynamics of 53BP1 during DSB processing for the cell types studied. A perpendicular (90°) irradiation scheme was used with the 4.0 Gy dose to achieve better separation of a relatively high number of particle tracks typically crossing each nucleus. For analyses along ion-tracks, the dose was reduced to 1.3 Gy and applied in combination with a sharp angle irradiation (10° relative to the cell plane). The results reveal a higher ratio of 53BP1 proteins recruited into SMLM defined clusters in fibroblasts as compared to U87 cells. Moreover, the speed of foci and thus cluster formation and relaxation also differed for the cell types. In both NHDF and U87 cells, a certain number of the detected and functionally relevant clusters remained persistent even 24 h post irradiation; however, the number of these clusters again varied for the cell types. Altogether, our findings indicate that repair cluster formation as determined by SMLM and the relaxation (i.e., the remaining 53BP1 tags no longer fulfill the cluster definition) is cell type dependent and may be functionally explained and correlated to cell specific radio-sensitivity. The present study demonstrates that SMLM is a highly appropriate method for investigations of spatiotemporal protein organization in cell nuclei and how it influences the cell decision for a particular repair pathway at a given DSB site. | ||
| 650 | 4 | |a <sup>15</sup>N ion irradiation | |
| 650 | 4 | |a repair cluster formation | |
| 650 | 4 | |a repair cluster persistence | |
| 650 | 4 | |a repair foci nano-architecture | |
| 650 | 4 | |a single molecule localization microscopy (SMLM) | |
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| 700 | 1 | |a Bulanova, Tatiana |e VerfasserIn |4 aut | |
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