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Mamontova V, Trifault B, Burger K. Nono induces Gadd45b to mediate DNA repair. Life Sci Alliance 2024; 7:e202302555. [PMID: 38843934 PMCID: PMC11157152 DOI: 10.26508/lsa.202302555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 05/23/2024] [Accepted: 05/23/2024] [Indexed: 06/09/2024] Open
Abstract
RNA-binding proteins are frequently deregulated in cancer and emerge as effectors of the DNA damage response (DDR). The non-POU domain-containing octamer-binding protein NONO/p54nrb is a multifunctional RNA-binding protein that not only modulates the production and processing of mRNA, but also promotes the repair of DNA double-strand breaks (DSBs). Here, we investigate the impact of Nono deletion in the murine KP (KRas G12D , Trp53 -/- ) cell-based lung cancer model. We show that the deletion of Nono impairs the response to DNA damage induced by the topoisomerase II inhibitor etoposide or the radiomimetic drug bleomycin. Nono-deficient KP (KPN) cells display hyperactivation of DSB signalling and high levels of DSBs. The defects in the DDR are accompanied by reduced RNA polymerase II promoter occupancy, impaired nascent RNA synthesis, and attenuated induction of the DDR factor growth arrest and DNA damage-inducible beta (Gadd45b). Our data characterise Gadd45b as a putative Nono-dependent effector of the DDR and suggest that Nono mediates a genome-protective crosstalk of the DDR with the RNA metabolism via induction of Gadd45b.
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Affiliation(s)
- Victoria Mamontova
- https://ror.org/03pvr2g57 Mildred Scheel Early Career Center for Cancer Research (Mildred-Scheel-Nachwuchszentrum, MSNZ) Würzburg, University Hospital Würzburg, Würzburg, Germany
- https://ror.org/00fbnyb24 Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Würzburg, Germany
| | - Barbara Trifault
- https://ror.org/03pvr2g57 Mildred Scheel Early Career Center for Cancer Research (Mildred-Scheel-Nachwuchszentrum, MSNZ) Würzburg, University Hospital Würzburg, Würzburg, Germany
- https://ror.org/00fbnyb24 Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Würzburg, Germany
| | - Kaspar Burger
- https://ror.org/03pvr2g57 Mildred Scheel Early Career Center for Cancer Research (Mildred-Scheel-Nachwuchszentrum, MSNZ) Würzburg, University Hospital Würzburg, Würzburg, Germany
- https://ror.org/00fbnyb24 Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Würzburg, Germany
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Trifault B, Mamontova V, Cossa G, Ganskih S, Wei Y, Hofstetter J, Bhandare P, Baluapuri A, Nieto B, Solvie D, Ade CP, Gallant P, Wolf E, Larsen DH, Munschauer M, Burger K. Nucleolar detention of NONO shields DNA double-strand breaks from aberrant transcripts. Nucleic Acids Res 2024; 52:3050-3068. [PMID: 38224452 PMCID: PMC11014278 DOI: 10.1093/nar/gkae022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 12/11/2023] [Accepted: 01/04/2024] [Indexed: 01/16/2024] Open
Abstract
RNA-binding proteins emerge as effectors of the DNA damage response (DDR). The multifunctional non-POU domain-containing octamer-binding protein NONO/p54nrb marks nuclear paraspeckles in unperturbed cells, but also undergoes re-localization to the nucleolus upon induction of DNA double-strand breaks (DSBs). However, NONO nucleolar re-localization is poorly understood. Here we show that the topoisomerase II inhibitor etoposide stimulates the production of RNA polymerase II-dependent, DNA damage-inducible antisense intergenic non-coding RNA (asincRNA) in human cancer cells. Such transcripts originate from distinct nucleolar intergenic spacer regions and form DNA-RNA hybrids to tether NONO to the nucleolus in an RNA recognition motif 1 domain-dependent manner. NONO occupancy at protein-coding gene promoters is reduced by etoposide, which attenuates pre-mRNA synthesis, enhances NONO binding to pre-mRNA transcripts and is accompanied by nucleolar detention of a subset of such transcripts. The depletion or mutation of NONO interferes with detention and prolongs DSB signalling. Together, we describe a nucleolar DDR pathway that shields NONO and aberrant transcripts from DSBs to promote DNA repair.
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Affiliation(s)
- Barbara Trifault
- Mildred Scheel Early Career Center for Cancer Research (Mildred-Scheel-Nachwuchszentrum, MSNZ) Würzburg, University Hospital Würzburg, Josef-Schneider-Strasse 2, D-97080 Würzburg, Germany
- Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Victoria Mamontova
- Mildred Scheel Early Career Center for Cancer Research (Mildred-Scheel-Nachwuchszentrum, MSNZ) Würzburg, University Hospital Würzburg, Josef-Schneider-Strasse 2, D-97080 Würzburg, Germany
- Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Giacomo Cossa
- Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Sabina Ganskih
- Helmholtz Institute for RNA-based Infection Research, Helmholtz-Center for Infection Research, Josef-Schneider-Strasse 2, D-97080 Würzburg, Germany
| | - Yuanjie Wei
- Helmholtz Institute for RNA-based Infection Research, Helmholtz-Center for Infection Research, Josef-Schneider-Strasse 2, D-97080 Würzburg, Germany
| | - Julia Hofstetter
- Cancer Systems Biology Group, Theodor Boveri Institute, Biocenter, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Pranjali Bhandare
- Cancer Systems Biology Group, Theodor Boveri Institute, Biocenter, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Apoorva Baluapuri
- Cancer Systems Biology Group, Theodor Boveri Institute, Biocenter, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Blanca Nieto
- Nucleolar Stress and Disease Group, Danish Cancer Institute, Strandboulevarden 49, Copenhagen, Denmark
| | - Daniel Solvie
- Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Carsten P Ade
- Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Peter Gallant
- Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Elmar Wolf
- Cancer Systems Biology Group, Theodor Boveri Institute, Biocenter, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Dorthe H Larsen
- Nucleolar Stress and Disease Group, Danish Cancer Institute, Strandboulevarden 49, Copenhagen, Denmark
| | - Mathias Munschauer
- Helmholtz Institute for RNA-based Infection Research, Helmholtz-Center for Infection Research, Josef-Schneider-Strasse 2, D-97080 Würzburg, Germany
| | - Kaspar Burger
- Mildred Scheel Early Career Center for Cancer Research (Mildred-Scheel-Nachwuchszentrum, MSNZ) Würzburg, University Hospital Würzburg, Josef-Schneider-Strasse 2, D-97080 Würzburg, Germany
- Department of Biochemistry and Molecular Biology, Biocenter of the University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
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