Requirement for PBAF in transcriptional repression and repair at DNA breaks in actively transcribed regions of chromatin.
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ICR Authors
Authors
Kakarougkas, A
Ismail, A
Chambers, AL
Riballo, E
Herbert, AD
Künzel, J
Löbrich, M
Jeggo, PA
Downs, JA
Ismail, A
Chambers, AL
Riballo, E
Herbert, AD
Künzel, J
Löbrich, M
Jeggo, PA
Downs, JA
Document Type
Journal Article
Date
2014-09-04
Date Accepted
2014-06-19
Abstract
Actively transcribed regions of the genome are vulnerable to genomic instability. Recently, it was discovered that transcription is repressed in response to neighboring DNA double-strand breaks (DSBs). It is not known whether a failure to silence transcription flanking DSBs has any impact on DNA repair efficiency or whether chromatin remodelers contribute to the process. Here, we show that the PBAF remodeling complex is important for DSB-induced transcriptional silencing and promotes repair of a subset of DNA DSBs at early time points, which can be rescued by inhibiting transcription globally. An ATM phosphorylation site on BAF180, a PBAF subunit, is required for both processes. Furthermore, we find that subunits of the PRC1 and PRC2 polycomb group complexes are similarly required for DSB-induced silencing and promoting repair. Cancer-associated BAF180 mutants are unable to restore these functions, suggesting PBAF's role in repressing transcription near DSBs may contribute to its tumor suppressor activity.
Citation
Molecular cell, 2014, 55 (5), pp. 723 - 732
Source Title
Publisher
CELL PRESS
ISSN
1097-2765
eISSN
1097-4164
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Research Team
Epigenetics and Genome Stability