Localized Movement and Levels of 53BP1 Protein Are Changed by gamma-irradiation in PML Deficient Cells

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Authors

LEGARTOVÁ Soňa ŘEZNÍČKOVÁ-PODLOUČKOVÁ Petra MALYŠKOVÁ Barbora KÜNTZIGER Thomas COLLAS Philippe CMARKO Dušan RAŠKA Ivan SOROKIN Dmitry KOZUBEK Stanislav BÁRTOVÁ Eva

Year of publication 2016
Type Article in Periodical
Magazine / Source Journal of Cellular Biochemistry [IF=2.778 (1990)]
MU Faculty or unit

Faculty of Informatics

Citation
Doi http://dx.doi.org/10.1002/jcb.25551
Field Genetics and molecular biology
Keywords DNA REPAIR; 53BP1 PROTEIN; PML BODIES; HISTONE MODIFICATIONS; MICROSCOPY; PHOTOBLEACHING
Description We studied epigenetics, distribution pattern, kinetics, and diffusion of proteins recruited to spontaneous and g-radiation-induced DNA lesions. We showed that PML deficiency leads to an increased number of DNA lesions, which was accompanied by changes in histone signature. In PML wt cells, we observed two mobile fractions of 53BP1 protein with distinct diffusion in spontaneous lesions. These protein fractions were not detected in PML-deficient cells, characterized by slow-diffusion of 53BP1. Single particle tracking analysis revealed limited local motion of 53BP1 foci in PML double null cells and local motion 53BP1 foci was even more reduced after g-irradiation. However, radiation did not change co-localization between 53BP1 nuclear bodies and interchromatin granule-associated zones (IGAZs), nuclear speckles, or chromocenters. This newly observed interaction pattern imply that 53BP1 protein could be a part of not only DNA repair, but also process mediated via components accumulated in IGAZs, nuclear speckles, or paraspeckles. Together, PML deficiency affected local motion of 53BP1 nuclear bodies and changed composition and a number of irradiation-induced foci.
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