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Koob L, Friskes A, van Bergen L, Feringa FM, van den Broek B, Koeleman ES, van Beek E, Schubert M, Blomen VA, Brummelkamp TR, Krenning L, Medema RH. MND1 enables homologous recombination in somatic cells primarily outside the context of replication. Mol Oncol 2023. [PMID: 37195379 DOI: 10.1002/1878-0261.13448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 03/28/2023] [Indexed: 05/18/2023] Open
Abstract
Faithful and timely repair of DNA double-strand breaks (DSBs) is fundamental for the maintenance of genomic integrity. Here, we demonstrate that the meiotic recombination co-factor MND1 facilitates the repair of DSBs in somatic cells. We show that MND1 localizes to DSBs, where it stimulates DNA repair through homologous recombination (HR). Importantly, MND1 is not involved in the response to replication-associated DSBs, implying that it is dispensable for HR-mediated repair of one-ended DSBs. Instead, we find that MND1 specifically plays a role in the response to two-ended DSBs that are induced by irradiation (IR) or various chemotherapeutic drugs. Surprisingly, we find that MND1 is specifically active in G2 phase, whereas it only marginally affects repair during S phase. MND1 localization to DSBs is dependent on resection of the DNA ends, and seemingly occurs through direct binding of MND1 to RAD51- coated ssDNA. Importantly, the lack of MND1-driven HR repair directly potentiates the toxicity of IR-induced damage, which could open new possibilities for therapeutic intervention, specifically in HR-proficient tumors.
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Affiliation(s)
- Lisa Koob
- Oncode Institute, Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
| | - Anoek Friskes
- Oncode Institute, Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
| | - Louise van Bergen
- Oncode Institute, Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
| | - Femke M Feringa
- Oncode Institute, Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research (CNCR), VU University Amsterdam, 1081, Amsterdam, The Netherlands
| | - Bram van den Broek
- Bioimaging facility, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
| | - Emma S Koeleman
- Oncode Institute, Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
- Chromatin Networks, German Cancer Research Center (DKFZ), 69120, Heidelberg, Germany
| | - Ellis van Beek
- Oncode Institute, Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
| | - Michael Schubert
- Oncode Institute, Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
| | - Vincent A Blomen
- Oncode Institute, Division of Biochemistry, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
- Scenic Biotech, 1098 XG, Amsterdam, The Netherlands
| | - Thijn R Brummelkamp
- Oncode Institute, Division of Biochemistry, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
| | - Lenno Krenning
- Oncode Institute, Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
- Crown Bioscience, 3584 CM, Utrecht, The Netherlands
| | - René H Medema
- Oncode Institute, Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066, CX, Amsterdam, The Netherlands
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