PARylation of BRCA1 limits DNA break resection through BRCA2 and EXO1
Summary: The nucleolytic processing (resection) of a DNA double-strand break (DSB) is a critical step to repair the lesion by homologous recombination (HR). PARylation, which is the attachment of poly(ADP-ribose) (PAR) units to specific targets by PAR polymerases (PARPs), regulates many steps of HR,...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-02-01
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| Series: | Cell Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211124723000712 |
| _version_ | 1811173427559530496 |
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| author | Samuele Lodovichi Roberto Quadri Sarah Sertic Achille Pellicioli |
| author_facet | Samuele Lodovichi Roberto Quadri Sarah Sertic Achille Pellicioli |
| author_sort | Samuele Lodovichi |
| collection | DOAJ |
| description | Summary: The nucleolytic processing (resection) of a DNA double-strand break (DSB) is a critical step to repair the lesion by homologous recombination (HR). PARylation, which is the attachment of poly(ADP-ribose) (PAR) units to specific targets by PAR polymerases (PARPs), regulates many steps of HR, including resection. Here, we show that preventing PARylation of the oncosuppressor BRCA1 induces hyper-resection of DSBs through BRCA2 and the EXO1 nuclease. Upon expression of the unPARylatable variant of BRCA1, we observe a reduced 53BP1-RIF1 barrier for resection accompanied by an increase in the recruitment of the RAD51 recombinase. Similar results are observed when cells are treated with the clinically approved PARP inhibitor olaparib. We propose that PARylation of BRCA1 is important to limit the formation of excessively extended DNA filaments, thereby reducing illegitimate chromosome rearrangements. Our results shed light on molecular aspects of HR and on the mechanisms of PARP inhibitor treatment. |
| first_indexed | 2024-04-10T17:46:41Z |
| format | Article |
| id | doaj.art-a122f8c971014469b41152925330e687 |
| institution | Directory Open Access Journal |
| issn | 2211-1247 |
| language | English |
| last_indexed | 2024-04-10T17:46:41Z |
| publishDate | 2023-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Cell Reports |
| spelling | doaj.art-a122f8c971014469b41152925330e6872023-02-03T04:57:32ZengElsevierCell Reports2211-12472023-02-01422112060PARylation of BRCA1 limits DNA break resection through BRCA2 and EXO1Samuele Lodovichi0Roberto Quadri1Sarah Sertic2Achille Pellicioli3Dipartimento di Bioscienze, Università degli Studi di Milano, 20131 Milano, ItalyDipartimento di Bioscienze, Università degli Studi di Milano, 20131 Milano, ItalyDipartimento di Bioscienze, Università degli Studi di Milano, 20131 Milano, ItalyDipartimento di Bioscienze, Università degli Studi di Milano, 20131 Milano, Italy; Corresponding authorSummary: The nucleolytic processing (resection) of a DNA double-strand break (DSB) is a critical step to repair the lesion by homologous recombination (HR). PARylation, which is the attachment of poly(ADP-ribose) (PAR) units to specific targets by PAR polymerases (PARPs), regulates many steps of HR, including resection. Here, we show that preventing PARylation of the oncosuppressor BRCA1 induces hyper-resection of DSBs through BRCA2 and the EXO1 nuclease. Upon expression of the unPARylatable variant of BRCA1, we observe a reduced 53BP1-RIF1 barrier for resection accompanied by an increase in the recruitment of the RAD51 recombinase. Similar results are observed when cells are treated with the clinically approved PARP inhibitor olaparib. We propose that PARylation of BRCA1 is important to limit the formation of excessively extended DNA filaments, thereby reducing illegitimate chromosome rearrangements. Our results shed light on molecular aspects of HR and on the mechanisms of PARP inhibitor treatment.http://www.sciencedirect.com/science/article/pii/S2211124723000712CP: Molecular biology |
| spellingShingle | Samuele Lodovichi Roberto Quadri Sarah Sertic Achille Pellicioli PARylation of BRCA1 limits DNA break resection through BRCA2 and EXO1 Cell Reports CP: Molecular biology |
| title | PARylation of BRCA1 limits DNA break resection through BRCA2 and EXO1 |
| title_full | PARylation of BRCA1 limits DNA break resection through BRCA2 and EXO1 |
| title_fullStr | PARylation of BRCA1 limits DNA break resection through BRCA2 and EXO1 |
| title_full_unstemmed | PARylation of BRCA1 limits DNA break resection through BRCA2 and EXO1 |
| title_short | PARylation of BRCA1 limits DNA break resection through BRCA2 and EXO1 |
| title_sort | parylation of brca1 limits dna break resection through brca2 and exo1 |
| topic | CP: Molecular biology |
| url | http://www.sciencedirect.com/science/article/pii/S2211124723000712 |
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