FUS-dependent liquid-liquid phase separation is important for DNA repair initiation

Brunno R. Levone, Silvia C. Lenzken, Marco Antonaci, Andreas Maiser, Alexander Rapp, Francesca Conte, Stefan Reber, Jonas Mechtersheimer, Antonella E. Ronchi, Oliver Mühlemann, Heinrich Leonhardt, M. Cristina Cardoso, Marc David Ruepp, Silvia M.L. Barabino

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

RNA-binding proteins (RBPs) are emerging as important effectors of the cellular DNA damage response (DDR). The RBP FUS is implicated in RNA metabolism and DNA repair, and it undergoes reversible liquid-liquid phase separation (LLPS) in vitro. Here, we demonstrate that FUS-dependent LLPS is necessary for the initiation of the DDR. Using laser microirradiation in FUS-knockout cells, we show that FUS is required for the recruitment to DNA damage sites of the DDR factors KU80, NBS1, and 53BP1 and of SFPQ, another RBP implicated in the DDR. The relocation of KU80, NBS1, and SFPQ is similarly impaired by LLPS inhibitors, or LLPS-deficient FUS variants. We also show that LLPS is necessary for efficient γH2AX foci formation. Finally, using superresolution structured illumination microscopy, we demonstrate that the absence of FUS impairs the proper arrangement of γH2AX nanofoci into higher-order clusters. These findings demonstrate the early requirement for FUS-dependent LLPS in the activation of the DDR and the proper assembly of DSB repair complexes.

Original languageEnglish
Article numbere202008030
JournalThe Journal of cell biology
Volume220
Issue number5
DOIs
Publication statusPublished - 3 May 2021

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