1
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Casimir L, Zimmer S, Racine-Brassard F, Goudreau F, Jacques PÉ, Maréchal A. Chronic treatment with ATR and CHK1 inhibitors does not substantially increase the mutational burden of human cells. Mutat Res 2023; 827:111834. [PMID: 37531716 DOI: 10.1016/j.mrfmmm.2023.111834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 07/13/2023] [Accepted: 07/19/2023] [Indexed: 08/04/2023]
Abstract
DNA replication stress (RS) entails the frequent slow down and arrest of replication forks by a variety of conditions that hinder accurate and processive genome duplication. Elevated RS leads to genome instability, replication catastrophe and eventually cell death. RS is particularly prevalent in cancer cells and its exacerbation to unsustainable levels by chemotherapeutic agents remains a cornerstone of cancer treatments. The adverse consequences of RS are normally prevented by the ATR and CHK1 checkpoint kinases that stabilize stressed forks, suppress origin firing and promote cell cycle arrest when replication is perturbed. Specific inhibitors of these kinases have been developed and shown to potentiate RS and cell death in multiple in vitro cancer settings. Ongoing clinical trials are now probing their efficacy against various cancer types, either as single agents or in combination with mainstay chemotherapeutics. Despite their promise as valuable additions to the anti-cancer pharmacopoeia, we still lack a genome-wide view of the potential mutagenicity of these new drugs. To investigate this question, we performed chronic long-term treatments of TP53-depleted human cancer cells with ATR and CHK1 inhibitors (ATRi, AZD6738/ceralasertib and CHK1i, MK8776/SCH-900776). ATR or CHK1 inhibition did not significantly increase the mutational burden of cells, nor generate specific mutational signatures. Indeed, no notable changes in the numbers of base substitutions, short insertions/deletions and larger scale rearrangements were observed despite induction of replication-associated DNA breaks during treatments. Interestingly, ATR inhibition did induce a slight increase in closely-spaced mutations, a feature previously attributed to translesion synthesis DNA polymerases. The results suggest that ATRi and CHK1i do not have substantial mutagenic effects in vitro when used as standalone agents.
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Affiliation(s)
- Lisa Casimir
- Département de Biologie, Université de Sherbrooke, Sherbrooke J1K 2R1, QC, Canada; Institut de Recherche sur le Cancer de l'Université de Sherbrooke (IRCUS), Sherbrooke J1K 2R1, QC, Canada
| | - Samuel Zimmer
- Département de Biologie, Université de Sherbrooke, Sherbrooke J1K 2R1, QC, Canada; Institut de Recherche sur le Cancer de l'Université de Sherbrooke (IRCUS), Sherbrooke J1K 2R1, QC, Canada
| | - Félix Racine-Brassard
- Département de Biologie, Université de Sherbrooke, Sherbrooke J1K 2R1, QC, Canada; Institut de Recherche sur le Cancer de l'Université de Sherbrooke (IRCUS), Sherbrooke J1K 2R1, QC, Canada
| | - Félix Goudreau
- Département de Biologie, Université de Sherbrooke, Sherbrooke J1K 2R1, QC, Canada; Institut de Recherche sur le Cancer de l'Université de Sherbrooke (IRCUS), Sherbrooke J1K 2R1, QC, Canada
| | - Pierre-Étienne Jacques
- Département de Biologie, Université de Sherbrooke, Sherbrooke J1K 2R1, QC, Canada; Institut de Recherche sur le Cancer de l'Université de Sherbrooke (IRCUS), Sherbrooke J1K 2R1, QC, Canada; Centre de recherche du Centre hospitalier universitaire de Sherbrooke (CRCHUS), Sherbrooke J1H 5N3, QC, Canada.
| | - Alexandre Maréchal
- Département de Biologie, Université de Sherbrooke, Sherbrooke J1K 2R1, QC, Canada; Institut de Recherche sur le Cancer de l'Université de Sherbrooke (IRCUS), Sherbrooke J1K 2R1, QC, Canada; Centre de recherche du Centre hospitalier universitaire de Sherbrooke (CRCHUS), Sherbrooke J1H 5N3, QC, Canada.
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2
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Wang Y, Jiang Z, Qin A, Wang F, Chang E, Liu Y, Nie W, Tan C, Yuan Y, Dong Y, Huang R, Jia Z, Wang J. Population Structure, Genetic Diversity and Candidate Genes for the Adaptation to Environmental Stress in Picea koraiensis. PLANTS (BASEL, SWITZERLAND) 2023; 12:1266. [PMID: 36986954 PMCID: PMC10055018 DOI: 10.3390/plants12061266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 03/07/2023] [Accepted: 03/08/2023] [Indexed: 06/19/2023]
Abstract
Picea koraiensis is major silvicultural and timber species in northeast China, and its distribution area is an important transition zone for genus spruce migration. The degree of intraspecific differentiation of P. koraiensis is high, but population structure and differentiation mechanisms are not clear. In this study, 523,761 single nucleotide polymorphisms (SNPs) were identified in 113 individuals from 9 populations of P. koraiensis by genotyping-by-sequencing (GBS). Population genomic analysis showed that P. koraiensis was divided into three geoclimatic regions: Great Khingan Mountains climatic region, Lesser Khingan Mountains climatic region, and Changbai Mountain climatic region. Mengkeshan (MKS) population on the northern edge of the distribution area and Wuyiling (WYL) population located in the mining area are two highly differentiated groups. Selective sweep analysis showed that MKS and WYL populations had 645 and 1126 selected genes, respectively. Genes selected in the MKS population were associated with flowering and photomorphogenesis, cellular response to water deficit, and glycerophospholipid metabolism; genes selected in the WYL population were associated with metal ion transport, biosynthesis of macromolecules, and DNA repair. Climatic factors and heavy metal stress drives divergence in MKS and WYL populations, respectively. Our findings provide insights into adaptive divergence mechanisms in Picea and will contribute to molecular breeding studies.
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Affiliation(s)
- Ya Wang
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
| | - Zeping Jiang
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
| | - Aili Qin
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
| | - Fude Wang
- Forestry Research Institute in Heilongjiang Province, Harbin 150081, China
| | - Ermei Chang
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
| | - Yifu Liu
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
| | - Wen Nie
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
| | - Cancan Tan
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
| | - Yanchao Yuan
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
| | - Yao Dong
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
| | - Ruizhi Huang
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
| | - Zirui Jia
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
| | - Junhui Wang
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
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3
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Tsirkas I, Zur T, Dovrat D, Cohen A, Ravkaie L, Aharoni A. Protein fluorescent labeling in live yeast cells using scFv-based probes. CELL REPORTS METHODS 2022; 2:100357. [PMID: 36590693 PMCID: PMC9795370 DOI: 10.1016/j.crmeth.2022.100357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 09/19/2022] [Accepted: 11/10/2022] [Indexed: 12/12/2022]
Abstract
The fusion of fluorescent proteins (FPs) to endogenous proteins is a widespread approach for microscopic examination of protein function, expression, and localization in the cell. However, proteins that are sensitive to FP fusion or expressed at low levels are difficult to monitor using this approach. Here, we develop a single-chain fragment variable (scFv)-FP approach to efficiently label Saccharomyces cerevisiae proteins that are tagged with repeats of hemagglutinin (HA)-tag sequences. We demonstrate the successful labeling of DNA-binding proteins and proteins localized to different cellular organelles including the nuclear membrane, peroxisome, Golgi apparatus, and mitochondria. This approach can lead to a significant increase in fluorescence intensity of the labeled protein, allows C'-terminal labeling of difficult-to-tag proteins and increased detection sensitivity of DNA-damage foci. Overall, the development of a scFv-FP labeling approach in yeast provides a general and simple tool for the function and localization analysis of the yeast proteome.
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Affiliation(s)
- Ioannis Tsirkas
- Department of Life Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Be’er Sheva 84105, Israel
| | - Tomer Zur
- Department of Life Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Be’er Sheva 84105, Israel
| | - Daniel Dovrat
- Department of Life Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Be’er Sheva 84105, Israel
| | - Amit Cohen
- Department of Life Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Be’er Sheva 84105, Israel
| | - Lior Ravkaie
- Department of Life Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Be’er Sheva 84105, Israel
| | - Amir Aharoni
- Department of Life Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Be’er Sheva 84105, Israel
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4
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Fang X, Rao K, Wei Z, Cheng J. SOX10
modulated
SMARCA4
dysregulation alleviates
DNA
replication stress in cutaneous melanoma. J Cell Mol Med 2022; 26:5846-5857. [DOI: 10.1111/jcmm.17607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 09/21/2022] [Accepted: 10/15/2022] [Indexed: 12/05/2022] Open
Affiliation(s)
- Xiangjian Fang
- Department of Burns and Plastic Surgery Fujian Medical University Affiliated First Quanzhou Hospital Quanzhou Fujian Province China
| | - Keqiang Rao
- School of Medicine Shanghai Jiao Tong University Shanghai China
| | - Zhiyi Wei
- Department of Burns and Plastic Surgery Fujian Medical University Affiliated First Quanzhou Hospital Quanzhou Fujian Province China
| | - Juntao Cheng
- Department of Burns and Plastic Surgery Fujian Medical University Affiliated First Quanzhou Hospital Quanzhou Fujian Province China
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5
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Lemay JF, St-Hilaire E, Ronato DA, Gao Y, Bélanger F, Gezzar-Dandashi S, Kimenyi Ishimwe AB, Sawchyn C, Lévesque D, McQuaid M, Boisvert FM, Mallette FA, Masson JY, Drobetsky EA, Wurtele H. A genome-wide screen identifies SCAI as a modulator of the UV-induced replicative stress response. PLoS Biol 2022; 20:e3001543. [PMID: 36215310 PMCID: PMC9584372 DOI: 10.1371/journal.pbio.3001543] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Revised: 10/20/2022] [Accepted: 09/05/2022] [Indexed: 11/23/2022] Open
Abstract
Helix-destabilizing DNA lesions induced by environmental mutagens such as UV light cause genomic instability by strongly blocking the progression of DNA replication forks (RFs). At blocked RF, single-stranded DNA (ssDNA) accumulates and is rapidly bound by Replication Protein A (RPA) complexes. Such stretches of RPA-ssDNA constitute platforms for recruitment/activation of critical factors that promote DNA synthesis restart. However, during periods of severe replicative stress, RPA availability may become limiting due to inordinate sequestration of this multifunctional complex on ssDNA, thereby negatively impacting multiple vital RPA-dependent processes. Here, we performed a genome-wide screen to identify factors that restrict the accumulation of RPA-ssDNA during UV-induced replicative stress. While this approach revealed some expected "hits" acting in pathways such as nucleotide excision repair, translesion DNA synthesis, and the intra-S phase checkpoint, it also identified SCAI, whose role in the replicative stress response was previously unappreciated. Upon UV exposure, SCAI knock-down caused elevated accumulation of RPA-ssDNA during S phase, accompanied by reduced cell survival and compromised RF progression. These effects were independent of the previously reported role of SCAI in 53BP1-dependent DNA double-strand break repair. We also found that SCAI is recruited to UV-damaged chromatin and that its depletion promotes nascent DNA degradation at stalled RF. Finally, we (i) provide evidence that EXO1 is the major nuclease underlying ssDNA formation and DNA replication defects in SCAI knockout cells and, consistent with this, (ii) demonstrate that SCAI inhibits EXO1 activity on a ssDNA gap in vitro. Taken together, our data establish SCAI as a novel regulator of the UV-induced replicative stress response in human cells.
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Affiliation(s)
- Jean-François Lemay
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
| | - Edlie St-Hilaire
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
| | - Daryl A. Ronato
- Genome Stability Laboratory, CHU de Québec Research Center, Oncology Division; Department of Molecular Biology, Medical Biochemistry and Pathology; Laval University Cancer Research Center, Québec City, Québec, Canada
| | - Yuandi Gao
- Genome Stability Laboratory, CHU de Québec Research Center, Oncology Division; Department of Molecular Biology, Medical Biochemistry and Pathology; Laval University Cancer Research Center, Québec City, Québec, Canada
| | - François Bélanger
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
| | - Sari Gezzar-Dandashi
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
- Molecular Biology Program, Université de Montréal, Montréal, Québec, Canada
| | - Aimé Boris Kimenyi Ishimwe
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
- Molecular Biology Program, Université de Montréal, Montréal, Québec, Canada
| | - Christina Sawchyn
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Dominique Lévesque
- Department of Immunology and Cell Biology, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Mary McQuaid
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
| | | | - Frédérick A. Mallette
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Québec, Canada
- Department of Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Jean-Yves Masson
- Genome Stability Laboratory, CHU de Québec Research Center, Oncology Division; Department of Molecular Biology, Medical Biochemistry and Pathology; Laval University Cancer Research Center, Québec City, Québec, Canada
| | - Elliot A. Drobetsky
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
- Department of Medicine, Université de Montréal, Montréal, Québec, Canada
- * E-mail: (EAD); (HW)
| | - Hugo Wurtele
- Centre de recherche, de l’Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada
- Department of Medicine, Université de Montréal, Montréal, Québec, Canada
- * E-mail: (EAD); (HW)
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6
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Velegzhaninov IO, Belykh ES, Rasova EE, Pylina YI, Shadrin DM, Klokov DY. Radioresistance, DNA Damage and DNA Repair in Cells With Moderate Overexpression of RPA1. Front Genet 2020; 11:855. [PMID: 32849834 PMCID: PMC7411226 DOI: 10.3389/fgene.2020.00855] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Accepted: 07/13/2020] [Indexed: 12/02/2022] Open
Abstract
Molecular responses to genotoxic stress, such as ionizing radiation, are intricately complex and involve hundreds of genes. Whether targeted overexpression of an endogenous gene can enhance resistance to ionizing radiation remains to be explored. In the present study we take an advantage of the CRISPR/dCas9 technology to moderately overexpress the RPA1 gene that encodes a key functional subunit of the replication protein A (RPA). RPA is a highly conserved heterotrimeric single-stranded DNA-binding protein complex involved in DNA replication, recombination, and repair. Dysfunction of RPA1 is detrimental for cells and organisms and can lead to diminished resistance to many stress factors. We demonstrate that HEK293T cells overexpressing RPA1 exhibit enhanced resistance to cell killing by gamma-radiation. Using the alkali comet assay, we show a remarkable acceleration of DNA breaks rejoining after gamma-irradiation in RPA1 overexpressing cells. However, the spontaneous rate of DNA damage was also higher in the presence of RPA1 overexpression, suggesting alterations in the processing of replication errors due to elevated activity of the RPA protein. Additionally, the analysis of the distributions of cells with different levels of DNA damage showed a link between the RPA1 overexpression and the kinetics of DNA repair within differentially damaged cell subpopulations. Our results provide knew knowledge on DNA damage stress responses and indicate that the concept of enhancing radioresistance by targeted alteration of the expression of a single gene is feasible, however undesired consequences should be considered and evaluated.
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Affiliation(s)
- Ilya O Velegzhaninov
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar, Russia
| | - Elena S Belykh
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar, Russia
| | - Elena E Rasova
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar, Russia
| | - Yana I Pylina
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar, Russia
| | - Dmitry M Shadrin
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar, Russia
| | - Dmitry Yu Klokov
- Institut de Radioprotection et de Sureté Nucléaire, PSE-SANTE, SESANE, LRTOX, Fontenay-aux-Roses, France.,Department of Biochemistry, Microbiology, and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
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7
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Gaillard H, Santos-Pereira JM, Aguilera A. The Nup84 complex coordinates the DNA damage response to warrant genome integrity. Nucleic Acids Res 2019; 47:4054-4067. [PMID: 30715474 PMCID: PMC6486642 DOI: 10.1093/nar/gkz066] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 01/24/2019] [Accepted: 01/25/2019] [Indexed: 02/07/2023] Open
Abstract
DNA lesions interfere with cellular processes such as transcription and replication and need to be adequately resolved to warrant genome integrity. Beyond their primary role in molecule transport, nuclear pore complexes (NPCs) function in other processes such as transcription, nuclear organization and DNA double strand break (DSB) repair. Here we found that the removal of UV-induced DNA lesions by nucleotide excision repair (NER) is compromised in the absence of the Nup84 nuclear pore component. Importantly, nup84Δ cells show an exacerbated sensitivity to UV in early S phase and delayed replication fork progression, suggesting that unrepaired spontaneous DNA lesions persist during S phase. In addition, nup84Δ cells are defective in the repair of replication-born DSBs by sister chromatid recombination (SCR) and rely on post-replicative repair functions for normal proliferation, indicating dysfunctions in the cellular pathways that enable replication on damaged DNA templates. Altogether, our data reveal a central role of the NPC in the DNA damage response to facilitate replication progression through damaged DNA templates by promoting efficient NER and SCR and preventing chromosomal rearrangements.
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Affiliation(s)
- Hélène Gaillard
- Centro Andaluz de Biología Molecular y Medicina Regenerativa-CABIMER, Universidad de Sevilla-CSIC-Universidad Pablo de Olavide, 41092 Seville, Spain
| | - José M Santos-Pereira
- Centro Andaluz de Biología Molecular y Medicina Regenerativa-CABIMER, Universidad de Sevilla-CSIC-Universidad Pablo de Olavide, 41092 Seville, Spain
| | - Andrés Aguilera
- Centro Andaluz de Biología Molecular y Medicina Regenerativa-CABIMER, Universidad de Sevilla-CSIC-Universidad Pablo de Olavide, 41092 Seville, Spain
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8
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Abstract
The nucleotide excision repair (NER) system removes a variety of types of helix-distorting lesions from DNA through a dual incision mechanism, in which the damaged nucleotide bases are excised in the form of a small, excised, damage-containing single-stranded DNA oligonucleotide (sedDNA). Damage removal leaves a gap in the DNA template that must then be filled in by the action of a DNA polymerase and ligated to the downstream phosphodiester backbone in the DNA to complete the repair reaction. Defects in damage removal, sedDNA processing, or gap filling have the potential to be mutagenic and lethal to cells, and thus several human pathologies, including cancer and aging, are associated with defects in NER. This review summarizes our current understanding of NER with a focus on the enzymes that excise sedDNAs and restore the duplex DNA to its native state in human cells.
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Affiliation(s)
- Michael G Kemp
- Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, OH, United States.
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9
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Binan L, Bélanger F, Uriarte M, Lemay JF, Pelletier De Koninck JC, Roy J, Affar EB, Drobetsky E, Wurtele H, Costantino S. Opto-magnetic capture of individual cells based on visual phenotypes. eLife 2019; 8:e45239. [PMID: 30969169 PMCID: PMC6499596 DOI: 10.7554/elife.45239] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 04/09/2019] [Indexed: 12/19/2022] Open
Abstract
The ability to isolate rare live cells within a heterogeneous population based solely on visual criteria remains technically challenging, due largely to limitations imposed by existing sorting technologies. Here, we present a new method that permits labeling cells of interest by attaching streptavidin-coated magnetic beads to their membranes using the lasers of a confocal microscope. A simple magnet allows highly specific isolation of the labeled cells, which then remain viable and proliferate normally. As proof of principle, we tagged, isolated, and expanded individual cells based on three biologically relevant visual characteristics: i) presence of multiple nuclei, ii) accumulation of lipid vesicles, and iii) ability to resolve ionizing radiation-induced DNA damage foci. Our method constitutes a rapid, efficient, and cost-effective approach for isolation and subsequent characterization of rare cells based on observable traits such as movement, shape, or location, which in turn can generate novel mechanistic insights into important biological processes.
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Affiliation(s)
- Loïc Binan
- Research CenterMaisonneuve-Rosemont HospitalMontrealCanada
- Department of OphthalmologyUniversity of MontrealMontrealCanada
| | - François Bélanger
- Research CenterMaisonneuve-Rosemont HospitalMontrealCanada
- Department of Medicine and Molecular Biology ProgramUniversity of MontrealMontrealCanada
| | - Maxime Uriarte
- Research CenterMaisonneuve-Rosemont HospitalMontrealCanada
- Department of Medicine and Molecular Biology ProgramUniversity of MontrealMontrealCanada
| | | | | | - Joannie Roy
- Research CenterMaisonneuve-Rosemont HospitalMontrealCanada
| | - El Bachir Affar
- Research CenterMaisonneuve-Rosemont HospitalMontrealCanada
- Department of Medicine and Molecular Biology ProgramUniversity of MontrealMontrealCanada
| | - Elliot Drobetsky
- Research CenterMaisonneuve-Rosemont HospitalMontrealCanada
- Department of Medicine and Molecular Biology ProgramUniversity of MontrealMontrealCanada
| | - Hugo Wurtele
- Research CenterMaisonneuve-Rosemont HospitalMontrealCanada
| | - Santiago Costantino
- Research CenterMaisonneuve-Rosemont HospitalMontrealCanada
- Department of OphthalmologyUniversity of MontrealMontrealCanada
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10
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Gallo D, Kim T, Szakal B, Saayman X, Narula A, Park Y, Branzei D, Zhang Z, Brown GW. Rad5 Recruits Error-Prone DNA Polymerases for Mutagenic Repair of ssDNA Gaps on Undamaged Templates. Mol Cell 2019; 73:900-914.e9. [PMID: 30733119 DOI: 10.1016/j.molcel.2019.01.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Revised: 09/13/2018] [Accepted: 12/27/2018] [Indexed: 12/30/2022]
Abstract
Post-replication repair (PRR) allows tolerance of chemical- and UV-induced DNA base lesions in both an error-free and an error-prone manner. In classical PRR, PCNA monoubiquitination recruits translesion synthesis (TLS) DNA polymerases that can replicate through lesions. We find that PRR responds to DNA replication stress that does not cause base lesions. Rad5 forms nuclear foci during normal S phase and after exposure to types of replication stress where DNA base lesions are likely absent. Rad5 binds to the sites of stressed DNA replication forks, where it recruits TLS polymerases to repair single-stranded DNA (ssDNA) gaps, preventing mitotic defects and chromosome breaks. In contrast to the prevailing view of PRR, our data indicate that Rad5 promotes both mutagenic and error-free repair of undamaged ssDNA that arises during physiological and exogenous replication stress.
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Affiliation(s)
- David Gallo
- Department of Biochemistry, University of Toronto, 1 King's College Circle, Toronto, ON M5S 3E1, Canada; Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada
| | - TaeHyung Kim
- Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada; Department of Computer Science, University of Toronto, 1 King's College Circle, Toronto, ON M5S 3E1, Canada
| | - Barnabas Szakal
- IFOM, Fondazione Istituto FIRC di Oncologia Molecolare, Via Adamello 16, 20139 Milan, Italy
| | - Xanita Saayman
- Department of Biochemistry, University of Toronto, 1 King's College Circle, Toronto, ON M5S 3E1, Canada; Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada
| | - Ashrut Narula
- Department of Biochemistry, University of Toronto, 1 King's College Circle, Toronto, ON M5S 3E1, Canada; Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada
| | - Yoona Park
- Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada; Department of Computer Science, University of Toronto, 1 King's College Circle, Toronto, ON M5S 3E1, Canada
| | - Dana Branzei
- IFOM, Fondazione Istituto FIRC di Oncologia Molecolare, Via Adamello 16, 20139 Milan, Italy; Istituto di Genetica Molecolare, Consiglio Nazionale delle Ricerche (IGM-CNR), Via Abbiategrasso 207, 27100 Pavia, Italy
| | - Zhaolei Zhang
- Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada; Department of Computer Science, University of Toronto, 1 King's College Circle, Toronto, ON M5S 3E1, Canada
| | - Grant W Brown
- Department of Biochemistry, University of Toronto, 1 King's College Circle, Toronto, ON M5S 3E1, Canada; Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada.
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11
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Fortier E, Drobetsky E, Wurtele H. Know your limits: RPA availability and chemoresistance in ovarian cancer. Oncotarget 2019; 10:800-802. [PMID: 30783508 PMCID: PMC6368229 DOI: 10.18632/oncotarget.26607] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 01/13/2019] [Indexed: 11/28/2022] Open
Affiliation(s)
- Emile Fortier
- Centre de Recherche de l'Hôpital Maisonneuve-Rosemont, Montréal, Canada; Programme de Biologie Moléculaire, Université de Montréal, Montréal, Canada; Département de Médecine, Université de Montréal, Montréal, Canada
| | - Elliot Drobetsky
- Centre de Recherche de l'Hôpital Maisonneuve-Rosemont, Montréal, Canada; Programme de Biologie Moléculaire, Université de Montréal, Montréal, Canada; Département de Médecine, Université de Montréal, Montréal, Canada
| | - Hugo Wurtele
- Centre de Recherche de l'Hôpital Maisonneuve-Rosemont, Montréal, Canada; Programme de Biologie Moléculaire, Université de Montréal, Montréal, Canada; Département de Médecine, Université de Montréal, Montréal, Canada
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12
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Schoonen PM, Guerrero Llobet S, van Vugt MATM. Replication stress: Driver and therapeutic target in genomically instable cancers. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2018; 115:157-201. [PMID: 30798931 DOI: 10.1016/bs.apcsb.2018.10.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Genomically instable cancers are characterized by progressive loss and gain of chromosomal fragments, and the acquisition of complex genomic rearrangements. Such cancers, including triple-negative breast cancers and high-grade serous ovarian cancers, typically show aggressive behavior and lack actionable driver oncogenes. Increasingly, oncogene-induced replication stress or defective replication fork maintenance is considered an important driver of genomic instability. Paradoxically, while replication stress causes chromosomal instability and thereby promotes cancer development, it intrinsically poses a threat to cellular viability. Apparently, tumor cells harboring high levels of replication stress have evolved ways to cope with replication stress. As a consequence, therapeutic targeting of such compensatory mechanisms is likely to preferentially target cancers with high levels of replication stress and may prove useful in potentiating chemotherapeutic approaches that exert their effects by interfering with DNA replication. Here, we discuss how replication stress drives chromosomal instability, and the cell cycle-regulated mechanisms that cancer cells employ to deal with replication stress. Importantly, we discuss how mechanisms involving DNA structure-specific resolvases, cell cycle checkpoint kinases and mitotic processing of replication intermediates offer possibilities in developing treatments for difficult-to-treat genomically instable cancers.
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Affiliation(s)
- Pepijn M Schoonen
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Sergi Guerrero Llobet
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Marcel A T M van Vugt
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
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13
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Replication Protein A Availability during DNA Replication Stress Is a Major Determinant of Cisplatin Resistance in Ovarian Cancer Cells. Cancer Res 2018; 78:5561-5573. [DOI: 10.1158/0008-5472.can-18-0618] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 06/11/2018] [Accepted: 07/27/2018] [Indexed: 11/16/2022]
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14
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Khan AQ, Travers JB, Kemp MG. Roles of UVA radiation and DNA damage responses in melanoma pathogenesis. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2018; 59:438-460. [PMID: 29466611 PMCID: PMC6031472 DOI: 10.1002/em.22176] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 01/18/2018] [Accepted: 01/22/2018] [Indexed: 05/10/2023]
Abstract
The growing incidence of melanoma is a serious public health issue that merits a thorough understanding of potential causative risk factors, which includes exposure to ultraviolet radiation (UVR). Though UVR has been classified as a complete carcinogen and has long been recognized for its ability to damage genomic DNA through both direct and indirect means, the precise mechanisms by which the UVA and UVB components of UVR contribute to the pathogenesis of melanoma have not been clearly defined. In this review, we therefore highlight recent studies that have addressed roles for UVA radiation in the generation of DNA damage and in modulating the subsequent cellular responses to DNA damage in melanocytes, which are the cell type that gives rise to melanoma. Recent research suggests that UVA not only contributes to the direct formation of DNA lesions but also impairs the removal of UV photoproducts from genomic DNA through oxidation and damage to DNA repair proteins. Moreover, the melanocyte microenvironment within the epidermis of the skin is also expected to impact melanomagenesis, and we therefore discuss several paracrine signaling pathways that have been shown to impact the DNA damage response in UV-irradiated melanocytes. Lastly, we examine how alterations to the immune microenvironment by UVA-associated DNA damage responses may contribute to melanoma development. Thus, there appear to be multiple avenues by which UVA may elevate the risk of melanoma. Protective strategies against excess exposure to UVA wavelengths of light therefore have the potential to decrease the incidence of melanoma. Environ. Mol. Mutagen. 59:438-460, 2018. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Aiman Q Khan
- Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio
| | - Jeffrey B Travers
- Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio
- Dayton Veterans Affairs Medical Center, Dayton, Ohio
| | - Michael G Kemp
- Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio
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15
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Abstract
Proliferating cells rely on the so-called DNA replication checkpoint to ensure orderly completion of genome duplication, and its malfunction may lead to catastrophic genome disruption, including unscheduled firing of replication origins, stalling and collapse of replication forks, massive DNA breakage, and, ultimately, cell death. Despite many years of intensive research into the molecular underpinnings of the eukaryotic replication checkpoint, the mechanisms underlying the dismal consequences of its failure remain enigmatic. A recent development offers a unifying model in which the replication checkpoint guards against global exhaustion of rate-limiting replication regulators. Here we discuss how such a mechanism can prevent catastrophic genome disruption and suggest how to harness this knowledge to advance therapeutic strategies to eliminate cancer cells that inherently proliferate under increased DNA replication stress.
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Affiliation(s)
- Luis Toledo
- Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen, Denmark; Center for Chromosome Stability, Department of Cellular and Molecular Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen, Denmark.
| | - Kai John Neelsen
- Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen, Denmark
| | - Jiri Lukas
- Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen, Denmark.
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16
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Impact of Age and Insulin-Like Growth Factor-1 on DNA Damage Responses in UV-Irradiated Human Skin. Molecules 2017; 22:molecules22030356. [PMID: 28245638 PMCID: PMC5432641 DOI: 10.3390/molecules22030356] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 02/22/2017] [Accepted: 02/24/2017] [Indexed: 01/19/2023] Open
Abstract
The growing incidence of non-melanoma skin cancer (NMSC) necessitates a thorough understanding of its primary risk factors, which include exposure to ultraviolet (UV) wavelengths of sunlight and age. Whereas UV radiation (UVR) has long been known to generate photoproducts in genomic DNA that promote genetic mutations that drive skin carcinogenesis, the mechanism by which age contributes to disease pathogenesis is less understood and has not been sufficiently studied. In this review, we highlight studies that have considered age as a variable in examining DNA damage responses in UV-irradiated skin and then discuss emerging evidence that the reduced production of insulin-like growth factor-1 (IGF-1) by senescent fibroblasts in the dermis of geriatric skin creates an environment that negatively impacts how epidermal keratinocytes respond to UVR-induced DNA damage. In particular, recent data suggest that two principle components of the cellular response to DNA damage, including nucleotide excision repair and DNA damage checkpoint signaling, are both partially defective in keratinocytes with inactive IGF-1 receptors. Overcoming these tumor-promoting conditions in aged skin may therefore provide a way to lower aging-associated skin cancer risk, and thus we will consider how dermal wounding and related clinical interventions may work to rejuvenate the skin, re-activate IGF-1 signaling, and prevent the initiation of NMSC.
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17
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Kemp MG, Spandau DF, Simman R, Travers JB. Insulin-like Growth Factor 1 Receptor Signaling Is Required for Optimal ATR-CHK1 Kinase Signaling in Ultraviolet B (UVB)-irradiated Human Keratinocytes. J Biol Chem 2016; 292:1231-1239. [PMID: 27979966 DOI: 10.1074/jbc.m116.765883] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 12/08/2016] [Indexed: 01/16/2023] Open
Abstract
UVB wavelengths of light induce the formation of photoproducts in DNA that are potentially mutagenic if not properly removed by the nucleotide excision repair machinery. As an additional mechanism to minimize the risk of mutagenesis, UVB-irradiated cells also activate a checkpoint signaling cascade mediated by the ATM and Rad3-related (ATR) and checkpoint kinase 1 (CHK1) kinases to transiently suppress DNA synthesis and cell cycle progression. Given that keratinocytes in geriatric skin display reduced activation of the insulin-like growth factor 1 receptor (IGF-1R) and alterations in DNA repair rate, apoptosis, and senescence following UVB exposure, here we used cultured human keratinocytes in vitro and skin explants ex vivo to examine how IGF-1R activation status affects ATR-CHK1 kinase signaling and the inhibition of DNA replication following UVB irradiation. We find that disruption of IGF-1R signaling with small-molecule inhibitors or IGF-1 withdrawal partially abrogates both the phosphorylation and activation of CHK1 by ATR and the accompanying inhibition of chromosomal DNA synthesis in UVB-irradiated keratinocytes. A critical protein factor that mediates both ATR-CHK1 signaling and nucleotide excision repair is replication protein A, and we find that its accumulation on UVB-damaged chromatin is partially attenuated in cells with an inactive IGF-1R. These results indicate that mutagenesis and skin carcinogenesis in IGF-1-deficient geriatric skin may be caused by defects in multiple cellular responses to UVB-induced DNA damage, including through a failure to properly suppress DNA synthesis on UVB-damaged DNA templates.
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Affiliation(s)
- Michael G Kemp
- From the Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio 45435,
| | - Dan F Spandau
- the Departments of Dermatology and.,Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202, and
| | - Richard Simman
- From the Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio 45435
| | - Jeffrey B Travers
- From the Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio 45435.,the Dayton Veterans Affairs Medical Center, Dayton, Ohio 45428
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