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Cell Signal. 2021 Nov;87:110106. doi: 10.1016/j.cellsig.2021.110106. Epub 2021 Aug 05.

hMOB2 deficiency impairs homologous recombination-mediated DNA repair and sensitises cancer cells to PARP inhibitors.

Cellular signalling

Ramazan Gundogdu, M Kadir Erdogan, Angeliki Ditsiou, Victoria Spanswick, Juan Jose Garcia-Gomez, John A Hartley, Fumiko Esashi, Alexander Hergovich, Valenti Gomez

Affiliations

  1. Department of Biology, Bingol University, Bingol 12000, Turkey; UCL Cancer Institute, University College London, London WC1E 6DD, UK. Electronic address: [email protected].
  2. Department of Biology, Bingol University, Bingol 12000, Turkey.
  3. Department of Biochemistry and Biomedicine, University of Sussex, Brighton BN1 9QG, UK; UCL Cancer Institute, University College London, London WC1E 6DD, UK.
  4. UCL Cancer Institute, University College London, London WC1E 6DD, UK.
  5. Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK.
  6. UCL Cancer Institute, University College London, London WC1E 6DD, UK; Evotec France, Toulouse 31100, France.
  7. UCL Cancer Institute, University College London, London WC1E 6DD, UK. Electronic address: [email protected].

PMID: 34363951 PMCID: PMC8514680 DOI: 10.1016/j.cellsig.2021.110106

Abstract

Monopolar spindle-one binder (MOBs) proteins are evolutionarily conserved and contribute to various cellular signalling pathways. Recently, we reported that hMOB2 functions in preventing the accumulation of endogenous DNA damage and a subsequent p53/p21-dependent G1/S cell cycle arrest in untransformed cells. However, the question of how hMOB2 protects cells from endogenous DNA damage accumulation remained enigmatic. Here, we uncover hMOB2 as a regulator of double-strand break (DSB) repair by homologous recombination (HR). hMOB2 supports the phosphorylation and accumulation of the RAD51 recombinase on resected single-strand DNA (ssDNA) overhangs. Physiologically, hMOB2 expression supports cancer cell survival in response to DSB-inducing anti-cancer compounds. Specifically, loss of hMOB2 renders ovarian and other cancer cells more vulnerable to FDA-approved PARP inhibitors. Reduced MOB2 expression correlates with increased overall survival in patients suffering from ovarian carcinoma. Taken together, our findings suggest that hMOB2 expression may serve as a candidate stratification biomarker of patients for HR-deficiency targeted cancer therapies, such as PARP inhibitor treatments.

Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved.

Keywords: DNA damage response signalling; Homologous recombination DNA repair; Mps one binder 2 (MOB2); Personalised PARP inhibitor treatments

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