The poly(ADP-ribose)-dependent chromatin remodeler Alc1 induces local chromatin relaxation upon DNA damage

Sellou, Hafida; Lebeaupin, Théo; Chapuis, Catherine; Smith, Rebecca; Hegele, Anna; Singh, Hari R.; Kozlowski, Marek; Bultmann, Sebastian; Ladurner, Andreas G.; Timinszky, Gyula and Huet, Sébastien (2016): The poly(ADP-ribose)-dependent chromatin remodeler Alc1 induces local chromatin relaxation upon DNA damage. In: Molecular Biology of the Cell, Vol. 27, No. 24: pp. 3791-3799

Abstract

Chromatin relaxation is one of the earliest cellular responses to DNA damage. However, what determines these structural changes, including their ATP requirement, is not well understood. Using live-cell imaging and laser microirradiation to induce DNA lesions, we show that the local chromatin relaxation at DNA damage sites is regulated by PARP1 enzymatic activity. We also report that H1 is mobilized at DNA damage sites, but, since this mobilization is largely independent of poly(ADP-ribosyl) ation, it cannot solely explain the chromatin relaxation. Finally, we demonstrate the involvement of Alc1, a poly(ADP-ribose)-and ATP-dependent remodeler, in the chromatin-relaxation process. Deletion of Alc1 impairs chromatin relaxation after DNA damage, while its overexpression strongly enhances relaxation. Altogether our results identify Alc1 as an important player in the fast kinetics of the NAD(+)-and ATP-dependent chromatin relaxation upon DNA damage in vivo.

• Item Type: Journal article
• Faculties: Medicine; Biology
• Subjects: 600 Technology > 610 Medicine and health; 500 Science > 570 Life sciences; biology
• ISSN: 1059-1524
• Language: English