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Phase separation of 53 BP 1 determines liquid‐like behavior of DNA repair compartments

Open access
Kilic, Sinan, Lezaja, Aleksandra, Gatti, Marco, Bianco, Eliana, Michelena, Jone, Imhof, Ralph, Altmeyer, Matthias·2019·The EMBO Journal

Abstract

The DNA damage response (DDR) generates transient repair compartments to concentrate repair proteins and activate signaling factors. The physicochemical properties of these spatially confined compartments and their function remain poorly understood. Here, we establish, based on live cell microscopy and CRISPR/Cas9‐mediated endogenous protein tagging, that 53BP1‐marked repair compartments are dynamic, show droplet‐like behavior, and undergo frequent fusion and fission events. 53BP1 assembly, but not the upstream accumulation of γH2AX and MDC1, is highly sensitive to changes in osmotic pressure, temperature, salt concentration and to disruption of hydrophobic interactions. Phase separation of 53BP1 is substantiated by optoDroplet experiments, which further allowed dissection of the 53BP1 sequence elements that cooperate for light‐induced clustering. Moreover, we found the tumor suppressor protein p53 to be enriched within 53BP1 optoDroplets, and conditions that disrupt 53BP1 phase separation impair 53BP1‐dependent induction of p53 and diminish p53 target gene expression. We thus suggest that 53BP1 phase separation integrates localized DNA damage recognition and repair factor assembly with global p53‐dependent gene activation and cell fate decisions. The DNA damage response effector 53BP1 forms characteristic foci at DNA breaks, which are here found to exhibit liquid droplet‐like self‐compartmentalization important for downstream activation of the p53 tumor suppressor. Self‐compartmentalization of the DNA double‐strand break response effector 53BP1 plays a key role in damage‐induced activation of p53 and its downstream targets.

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Metadata

Authors
Kilic, S., Lezaja, A., Gatti, M., Bianco, E., Michelena, J., Imhof, R., & Altmeyer, M.
Venue
The EMBO Journal
Published
2019-07
Volume
38
Issue
16
Pages
e101379-e101379
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2953749471
Cited by
444
References
9
FWCI
15.11
Type
journal article
Language
en
Open access
hybrid

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