Nuclear F-actin counteracts nuclear deformation and promotes fork repair during replication stress

Filamentous actin (F-actin) provides cells with mechanical support and promotes the mobility of intracellular structures. Although F-actin is traditionally considered to be cytoplasmic, here we reveal that nuclear F-actin participates in the replication stress response. Using live and super-resoluti...

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Veröffentlicht in:Nature cell biology Jg. 22; H. 12; S. 1460 - 1470
Hauptverfasser: Lamm, Noa, Read, Mark N, Nobis, Max, Van Ly, David, Page, Scott G, Masamsetti, V Pragathi, Timpson, Paul, Biro, Maté, Cesare, Anthony J
Format: Journal Article
Sprache:Englisch
Veröffentlicht: England Nature Publishing Group 01.12.2020
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ISSN:1465-7392, 1476-4679, 1476-4679
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Abstract Filamentous actin (F-actin) provides cells with mechanical support and promotes the mobility of intracellular structures. Although F-actin is traditionally considered to be cytoplasmic, here we reveal that nuclear F-actin participates in the replication stress response. Using live and super-resolution imaging, we find that nuclear F-actin is polymerized in response to replication stress through a pathway regulated by ATR-dependent activation of mTORC1, and nucleation through IQGAP1, WASP and ARP2/3. During replication stress, nuclear F-actin increases the nuclear volume and sphericity to counteract nuclear deformation. Furthermore, F-actin and myosin II promote the mobility of stressed-replication foci to the nuclear periphery through increasingly diffusive motion and directed movements along the nuclear actin filaments. These actin functions promote replication stress repair and suppress chromosome and mitotic abnormalities. Moreover, we find that nuclear F-actin is polymerized in vivo in xenograft tumours after treatment with replication-stress-inducing chemotherapeutic agents, indicating that this pathway has a role in human disease.
AbstractList Filamentous actin (F-actin) provides cells with mechanical support and promotes the mobility of intracellular structures. Although F-actin is traditionally considered to be cytoplasmic, here we reveal that nuclear F-actin participates in the replication stress response. Using live and super-resolution imaging, we find that nuclear F-actin is polymerized in response to replication stress through a pathway regulated by ATR-dependent activation of mTORC1, and nucleation through IQGAP1, WASP and ARP2/3. During replication stress, nuclear F-actin increases the nuclear volume and sphericity to counteract nuclear deformation. Furthermore, F-actin and myosin II promote the mobility of stressed-replication foci to the nuclear periphery through increasingly diffusive motion and directed movements along the nuclear actin filaments. These actin functions promote replication stress repair and suppress chromosome and mitotic abnormalities. Moreover, we find that nuclear F-actin is polymerized in vivo in xenograft tumours after treatment with replication-stress-inducing chemotherapeutic agents, indicating that this pathway has a role in human disease.
Filamentous actin (F-actin) provides cells with mechanical support and promotes the mobility of intracellular structures. Although F-actin is traditionally considered to be cytoplasmic, here we reveal that nuclear F-actin participates in the replication stress response. Using live and super-resolution imaging, we find that nuclear F-actin is polymerized in response to replication stress through a pathway regulated by ATR-dependent activation of mTORC1, and nucleation through IQGAP1, WASP and ARP2/3. During replication stress, nuclear F-actin increases the nuclear volume and sphericity to counteract nuclear deformation. Furthermore, F-actin and myosin II promote the mobility of stressed-replication foci to the nuclear periphery through increasingly diffusive motion and directed movements along the nuclear actin filaments. These actin functions promote replication stress repair and suppress chromosome and mitotic abnormalities. Moreover, we find that nuclear F-actin is polymerized in vivo in xenograft tumours after treatment with replication-stress-inducing chemotherapeutic agents, indicating that this pathway has a role in human disease.Filamentous actin (F-actin) provides cells with mechanical support and promotes the mobility of intracellular structures. Although F-actin is traditionally considered to be cytoplasmic, here we reveal that nuclear F-actin participates in the replication stress response. Using live and super-resolution imaging, we find that nuclear F-actin is polymerized in response to replication stress through a pathway regulated by ATR-dependent activation of mTORC1, and nucleation through IQGAP1, WASP and ARP2/3. During replication stress, nuclear F-actin increases the nuclear volume and sphericity to counteract nuclear deformation. Furthermore, F-actin and myosin II promote the mobility of stressed-replication foci to the nuclear periphery through increasingly diffusive motion and directed movements along the nuclear actin filaments. These actin functions promote replication stress repair and suppress chromosome and mitotic abnormalities. Moreover, we find that nuclear F-actin is polymerized in vivo in xenograft tumours after treatment with replication-stress-inducing chemotherapeutic agents, indicating that this pathway has a role in human disease.
Filamentous actin (F-actin) provides cells with mechanical support and promotes the mobility of intracellular structures. Although F-actin is traditionally considered to be cytoplasmic, here we reveal that nuclear F-actin participates in the replication stress response. Using live and super-resolution imaging, we find that nuclear F-actin is polymerized in response to replication stress through a pathway regulated by ATR-dependent activation of mTORC1, and nucleation through IQGAP1, WASP and ARP2/3. During replication stress, nuclear F-actin increases the nuclear volume and sphericity to counteract nuclear deformation. Furthermore, F-actin and myosin II promote the mobility of stressed-replication foci to the nuclear periphery through increasingly diffusive motion and directed movements along the nuclear actin filaments. These actin functions promote replication stress repair and suppress chromosome and mitotic abnormalities. Moreover, we find that nuclear F-actin is polymerized in vivo in xenograft tumours after treatment with replication-stress-inducing chemotherapeutic agents, indicating that this pathway has a role in human disease.Lamm et al. report that replication stress activates mTOR through ATR to induce nuclear actin polymerization, facilitating the recovery from replication stress.
Author Lamm, Noa
Nobis, Max
Biro, Maté
Read, Mark N
Masamsetti, V Pragathi
Cesare, Anthony J
Van Ly, David
Page, Scott G
Timpson, Paul
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  organization: Genome Integrity Unit, Children's Medical Research Institute, University of Sydney, Westmead, New South Wales, Australia
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  givenname: Mark N
  orcidid: 0000-0002-1481-4780
  surname: Read
  fullname: Read, Mark N
  organization: School of Computer Science, The Westmead Initiative and The Charles Perkins Centre, University of Sydney, Camperdown, New South Wales, Australia
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  givenname: Max
  surname: Nobis
  fullname: Nobis, Max
  organization: The Garvan Institute of Medical Research, St Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
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  givenname: David
  surname: Van Ly
  fullname: Van Ly, David
  organization: School of Medicine, The University of Notre Dame Australia, Sydney, New South Wales, Australia
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  surname: Page
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  organization: Genome Integrity Unit, Children's Medical Research Institute, University of Sydney, Westmead, New South Wales, Australia
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  orcidid: 0000-0002-0251-1707
  surname: Masamsetti
  fullname: Masamsetti, V Pragathi
  organization: Genome Integrity Unit, Children's Medical Research Institute, University of Sydney, Westmead, New South Wales, Australia
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  surname: Timpson
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  organization: The Garvan Institute of Medical Research, St Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
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  givenname: Maté
  orcidid: 0000-0001-5852-3726
  surname: Biro
  fullname: Biro, Maté
  organization: EMBL Australia, Single Molecule Science node, School of Medical Sciences, University of New South Wales, Sydney, New South Wales, Australia
– sequence: 9
  givenname: Anthony J
  orcidid: 0000-0002-0864-1254
  surname: Cesare
  fullname: Cesare, Anthony J
  email: tcesare@cmri.org.au
  organization: Genome Integrity Unit, Children's Medical Research Institute, University of Sydney, Westmead, New South Wales, Australia. tcesare@cmri.org.au
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Snippet Filamentous actin (F-actin) provides cells with mechanical support and promotes the mobility of intracellular structures. Although F-actin is traditionally...
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StartPage 1460
SubjectTerms Abnormalities
Actin
Actin Cytoskeleton - metabolism
Actins - genetics
Actins - metabolism
Animals
Antineoplastic Agents - pharmacology
Carboplatin - pharmacology
Cell Line
Cell Line, Tumor
Cell Nucleus - genetics
Cell Nucleus - metabolism
Chemotherapy
Chromosomes
DNA Repair - genetics
DNA Replication - genetics
Filaments
Humans
Image resolution
IQGAP1 protein
Mechanistic Target of Rapamycin Complex 1 - genetics
Mechanistic Target of Rapamycin Complex 1 - metabolism
Mice, Inbred NOD
Mice, Knockout
Mice, SCID
Mobility
Myosin
Neoplasms - drug therapy
Neoplasms - genetics
Neoplasms - metabolism
Nuclear deformation
Nucleation
Polymerization
Repair
Replication
TOR protein
Tumors
Xenograft Model Antitumor Assays - methods
Xenografts
Xenotransplantation
Title Nuclear F-actin counteracts nuclear deformation and promotes fork repair during replication stress
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