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Mutations in DONSON disrupt replication fork stability and cause microcephalic dwarfism

  • John J Reynolds
  • , Louise S Bicknell
  • , Paula Carroll
  • , Martin R Higgs
  • , Ranad Shaheen
  • , Jennie E Murray
  • , Dimitrios K Papadopoulos
  • , Andrea Leitch
  • , Olga Murina
  • , Žygimantė Tarnauskaitė
  • , Sarah R Wessel
  • , Anastasia Zlatanou
  • , Audrey Vernet
  • , Alex von Kriegsheim
  • , Rachel M A Mottram
  • , Clare V Logan
  • , Hannah Bye
  • , Yun Li
  • , Alexander Brean
  • , Sateesh Maddirevula
  • Rachel C Challis, Kassiani Skouloudaki, Agaadir Almoisheer, Hessa S Alsaif, Ariella Amar, Natalie J Prescott, Michael B Bober, Angela Duker, Eissa Faqeih, Mohammed Zain Seidahmed, Saeed Al Tala, Abdulrahman Alswaid, Saleem Ahmed, Jumana Yousuf Al-Aama, Janine Altmüller, Mohammed Al Balwi, Angela F Brady, Luciana Chessa, Helen Cox, Rita Fischetto, Raoul Heller, Bertram D Henderson, Emma Hobson, Peter Nürnberg, E Ferda Percin, Angela Peron, Luigina Spaccini, Alan J Quigley, Seema Thakur, Carol A Wise, Grace Yoon, Maha Alnemer, Pavel Tomancak, Gökhan Yigit, A Malcolm R Taylor, Martin A M Reijns, Michael A Simpson, David Cortez, Fowzan S Alkuraya, Christopher G Mathew, Andrew P Jackson, Grant S Stewart
  • Edinburgh Imaging, University of Edinburgh, Edinburgh, UK.
  • University Hospitals Birmingham , Birmingham , UK.
  • King Faisal Specialist Hospital and Research Center
  • Max Planck Institute for Molecular Cell Biology and Genetics, Dresden
  • Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America.
  • King's College London University of London London WC2B 4BG UK
  • Department of NeuroDegeneration and Restorative Research, University Medical Center Göttingen
  • Nemours-Alfred I. duPont Hospital for Children
  • Children's Hospital of Philadelphia
  • Security Forces Hospital
  • Armed Forces Hospital
  • Department of Pediatrics, Olga Hospital, Stuttgart, Germany.
  • King Abdulaziz University Hospital
  • University Hopsital of Cologne
  • Department of Pathology and Laboratory Medicine
  • North West Thames Regional Genetics Service
  • Università degli Studi di Roma La Sapienza
  • Oncology, Birmingham Women's and Children's NHS Foundation Trust, Birmingham, UK. [email protected].; Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK. [email protected].; Children's Brain Tumour Research Team, 4th Floor Institute of Child Health, Birmingham Women's and Children's Hospital NHS Foundation Trust, Steelhouse Lane, Birmingham, B4 6NH, UK. [email protected].
  • Pediatric Hospital Giovanni XXIII
  • Department of Psychiatry and Psychotherapy, Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany
  • University of the Free State
  • Chapel Allerton Hospital
  • Gazi University Faculty of Medicine
  • V. Buzzi Children's Hospital
  • Royal Belfast Hospital for Sick Children
  • Department of Genetic and Fetal Medicine
  • Sarah M. and Charles E. Seay Center for Musculoskeletal Research
  • Neurosurgery, University of Toronto, Toronto, CAN.
  • Institute of Cancer and Genomic Sciences; University of Birmingham; Birmingham UK

Research output: Contribution to journalArticlepeer-review

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Abstract

To ensure efficient genome duplication, cells have evolved numerous factors that promote unperturbed DNA replication and protect, repair and restart damaged forks. Here we identify downstream neighbor of SON (DONSON) as a novel fork protection factor and report biallelic DONSON mutations in 29 individuals with microcephalic dwarfism. We demonstrate that DONSON is a replisome component that stabilizes forks during genome replication. Loss of DONSON leads to severe replication-associated DNA damage arising from nucleolytic cleavage of stalled replication forks. Furthermore, ATM- and Rad3-related (ATR)-dependent signaling in response to replication stress is impaired in DONSON-deficient cells, resulting in decreased checkpoint activity and the potentiation of chromosomal instability. Hypomorphic mutations in DONSON substantially reduce DONSON protein levels and impair fork stability in cells from patients, consistent with defective DNA replication underlying the disease phenotype. In summary, we have identified mutations in DONSON as a common cause of microcephalic dwarfism and established DONSON as a critical replication fork protein required for mammalian DNA replication and genome stability.

Original languageEnglish
Pages (from-to)537-549
Number of pages13
JournalNature Genetics
Volume49
Issue number4
Early online date13 Feb 2017
DOIs
Publication statusPublished - Apr 2017

Keywords

  • Cell Line
  • DNA Damage/genetics
  • DNA Replication/genetics
  • DNA-Binding Proteins/genetics
  • Dwarfism/genetics
  • Female
  • Genomic Instability/genetics
  • Humans
  • Male
  • Microcephaly/genetics
  • Mutation/genetics

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