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Zhang Y, Zhao L, Sun Y. Using single-sample networks to identify the contrasting patterns of gene interactions and reveal the radiation dose-dependent effects in multiple tissues of spaceflight mice. NPJ Microgravity 2024; 10:45. [PMID: 38575629 PMCID: PMC10995210 DOI: 10.1038/s41526-024-00383-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 03/08/2024] [Indexed: 04/06/2024] Open
Abstract
Transcriptome profiles are sensitive to space stressors and serve as valuable indicators of the biological effects during spaceflight. Herein, we transformed the expression profiles into gene interaction patterns by single-sample networks (SSNs) and performed the integrated analysis on the 301 spaceflight and 290 ground control samples, which were obtained from the GeneLab platform. Specifically, an individual SSN was established for each sample. Based on the topological structures of 591 SSNs, the differentially interacted genes (DIGs) were identified between spaceflights and ground controls. The results showed that spaceflight disrupted the gene interaction patterns in mice and resulted in significant enrichment of biological processes such as protein/amino acid metabolism and nucleic acid (DNA/RNA) metabolism (P-value < 0.05). We observed that the mice exposed to radiation doses within the three intervals (4.66-7.14, 7.592-8.295, 8.49-22.099 mGy) exhibited similar gene interaction patterns. Low and medium doses resulted in changes to the circadian rhythm, while the damaging effects on genetic material became more pronounced in higher doses. The gene interaction patterns in response to space stressors varied among different tissues, with the spleen, lung, and skin being the most responsive to space radiation (P-value < 0.01). The changes observed in gene networks during spaceflight conditions might contribute to the development of various diseases, such as mental disorders, depression, and metabolic disorders, among others. Additionally, organisms activated specific gene networks in response to virus reactivation. We identified several hub genes that were associated with circadian rhythms, suggesting that spaceflight could lead to substantial circadian rhythm dysregulation.
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Affiliation(s)
- Yan Zhang
- Institute of Environmental Systems Biology, College of Environmental Science and Engineering, Dalian Maritime University, 116026, Dalian, Liaoning, China
| | - Lei Zhao
- Institute of Environmental Systems Biology, College of Environmental Science and Engineering, Dalian Maritime University, 116026, Dalian, Liaoning, China.
| | - Yeqing Sun
- Institute of Environmental Systems Biology, College of Environmental Science and Engineering, Dalian Maritime University, 116026, Dalian, Liaoning, China.
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Akcora-Yildiz D, Ozkan T, Ozen M, Gunduz M, Sunguroglu A, Beksac M. Werner helicase is required for proliferation and DNA damage repair in multiple myeloma. Mol Biol Rep 2023; 50:1565-1573. [PMID: 36515823 DOI: 10.1007/s11033-022-08178-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 12/06/2022] [Indexed: 12/15/2022]
Abstract
BACKGROUND Multiple myeloma (MM), characterized by extensive genomic instability and aberrant DNA damage repair, is a plasma cell malignancy due to the excessive proliferation of monoclonal antibody-producing plasma cells in the bone marrow. Despite the significant improvement in the survival of patients with the development of novel therapeutic agents, MM remains an incurable disease. Werner (WRN) helicase, a member of the RecQ helicase family that contributes to DNA replication, recombination, and repair, has been highlighted in cancer cell survival, yet the role and mechanism of WRN in MM remain unclear. METHODS AND RESULTS Increased mRNA expression of WRN in newly diagnosed and relapsed CD138+ myeloma plasma cells than normal CD138+ plasma cells and their matched CD138- non-tumorigenic cells were detected by qPCR. Using NSC19630, a specific WRN helicase inhibitor, we further showed decreased cell viability, proliferation, and DNA repair and increased DNA damage and apoptosis in MM cells by MTT assay, cell cycle assay, apoptosis assay, and Western blotting. CONCLUSIONS The results of the present study demonstrate that WRN is essential in MM cell viability, proliferation, and genomic stability, indicating its inhibition may enhance the efficacy of chemotherapy in MM.
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Affiliation(s)
- Dilara Akcora-Yildiz
- Department of Biology, Art & Science Faculty, Mehmet Akif Ersoy University, Burdur, Turkey.
| | - Tulin Ozkan
- Department of Medical Biology, Faculty of Medicine, Ankara University, Ankara, Turkey
| | - Mehmet Ozen
- Hematology and Bone Marrow Transplant Unit, Bayındır Sogutozu Hospital, Ankara, Turkey
| | - Mehmet Gunduz
- Department of Hematology, Faculty of Medicine, Biruni University, Istanbul, Turkey
| | - Asuman Sunguroglu
- Department of Medical Biology, Faculty of Medicine, Ankara University, Ankara, Turkey
| | - Meral Beksac
- Department of Hematology, Faculty of Medicine, Ankara University, Ankara, Turkey
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3
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Levi H, Bar E, Cohen-Adiv S, Sweitat S, Kanner S, Galron R, Mitiagin Y, Barzilai A. Dysfunction of cerebellar microglia in Ataxia-telangiectasia. Glia 2021; 70:536-557. [PMID: 34854502 DOI: 10.1002/glia.24122] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 11/09/2021] [Accepted: 11/12/2021] [Indexed: 12/13/2022]
Abstract
Ataxia-telangiectasia (A-T) is a multisystem autosomal recessive disease caused by mutations in the ATM gene and characterized by cerebellar atrophy, progressive ataxia, immunodeficiency, male and female sterility, radiosensitivity, cancer predisposition, growth retardation, insulin-resistant diabetes, and premature aging. ATM phosphorylates more than 1500 target proteins, which are involved in cell cycle control, DNA repair, apoptosis, modulation of chromatin structure, and other cytoplasmic as well as mitochondrial processes. In our quest to better understand the mechanisms by which ATM deficiency causes cerebellar degeneration, we hypothesized that specific vulnerabilities of cerebellar microglia underlie the etiology of A-T. Our hypothesis is based on the recent finding that dysfunction of glial cells affect a variety of process leading to impaired neuronal functionality (Song et al., 2019). Whereas astrocytes and neurons descend from the neural tube, microglia originate from the hematopoietic system, invade the brain at early embryonic stage, and become the innate immune cells of the central nervous system and important participants in development of synaptic plasticity. Here we demonstrate that microglia derived from Atm-/- mouse cerebellum display accelerated cell migration and are severely impaired in phagocytosis, secretion of neurotrophic factors, and mitochondrial activity, suggestive of apoptotic processes. Interestingly, no microglial impairment was detected in Atm-deficient cerebral cortex, and Atm deficiency had less impact on astroglia than microglia. Collectively, our findings validate the roles of glial cells in cerebellar attrition in A-T.
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Affiliation(s)
- Hadar Levi
- Department of Neurobiology, George S. Wise, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Ela Bar
- Department of Neurobiology, George S. Wise, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Stav Cohen-Adiv
- Department of Neurobiology, George S. Wise, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Suzan Sweitat
- Department of Neurobiology, George S. Wise, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Sivan Kanner
- Department of Neurobiology, George S. Wise, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Ronit Galron
- Department of Neurobiology, George S. Wise, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Yulia Mitiagin
- Department of Neurobiology, George S. Wise, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Ari Barzilai
- Department of Neurobiology, George S. Wise, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
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4
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Wang W, Ma Y, Huang M, Liang W, Zhao X, Li Q, Wang S, Hu Z, He L, Gao T, Chen J, Pan F, Guo Z. Asymmetrical arginine dimethylation of histone H4 by 8-oxog/OGG1/PRMT1 is essential for oxidative stress-induced transcription activation. Free Radic Biol Med 2021; 164:175-186. [PMID: 33418111 DOI: 10.1016/j.freeradbiomed.2020.12.457] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 12/30/2020] [Accepted: 12/31/2020] [Indexed: 01/09/2023]
Abstract
It has been established that 8-oxoguanine DNA glycosylase 1 (OGG1) is the main enzyme removing oxidized guanine under oxidative stress. However, increasing evidence has shown that OGG1 is not only a base excision repair protein but also a new transcriptional coactivator involved in oxidative stress-induced gene expression. Its downstream target genes and the underlying regulatory mechanisms still need to be discerned. Here, it was discovered that c-Myc is a downstream target of OGG1 under oxidative stress and that H4R3me2a is involved in this transcriptional regulation. The increased level of H4R3me2a induced by H2O2 is regulated by OGG1, which may directly interact with the specific arginine methyltransferase PRMT1 and promote the asymmetrical dimethylation of H4R3me1. H4R3me2a enrichment on the promoter of c-Myc can recruit YY1 and activate c-Myc transcription. Moreover, knocking down OGG1 or PRMT1 suppresses c-Myc transcription under oxidative stress by downregulating H4R3me2a formation. Furthermore, the overexpression of wild type (WT) H4R3 promotes c-Myc transcription, but the expression of mutant H4R3Q does not have this effect. Taken together, our data show that the 8-oxoG/OGG1/PRMT1/H4R3me2a/YY1 axis senses oxidative stress and promotes gene transcription.
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Affiliation(s)
- Wentao Wang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China
| | - Ying Ma
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China
| | - Miaoling Huang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China
| | - Weichu Liang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China
| | - Xingqi Zhao
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China
| | - Qianwen Li
- Department of Radiotherapy, Taikang Xianlin Drum Tower Hospital, Nanjing University, Nanjing, 210000, China
| | - Shiwei Wang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China
| | - Zhigang Hu
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China
| | - Lingfeng He
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China
| | - Tao Gao
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China
| | - Jinfei Chen
- Department of Radiotherapy, Taikang Xianlin Drum Tower Hospital, Nanjing University, Nanjing, 210000, China; Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Personalized Cancer Medicine, Nanjing Medical University, Nanjing, 211166, China
| | - Feiyan Pan
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China.
| | - Zhigang Guo
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wen Yuan Road, Nanjing, 210023, China.
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Genome-Wide Association Study of Natural Variation in Arabidopsis Exposed to Acid Mine Drainage Toxicity and Validation of Associated Genes with Reverse Genetics. PLANTS 2021; 10:plants10020191. [PMID: 33498421 PMCID: PMC7909446 DOI: 10.3390/plants10020191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 01/15/2021] [Accepted: 01/18/2021] [Indexed: 11/16/2022]
Abstract
Acid mine drainage (AMD) is a huge environmental problem in mountain-top mining regions worldwide, including the Appalachian Mountains in the United States. This study applied a genome-wide association study (GWAS) to uncover genomic loci in Arabidopsis associated with tolerance to AMD toxicity. We characterized five major root phenotypes—cumulative root length, average root diameter, root surface area, root volume, and primary root length—in 180 Arabidopsis accessions in response to AMD-supplemented growth medium. GWAS of natural variation in the panel revealed genes associated with tolerance to an acidic environment. Most of these genes were transcription factors, anion/cation transporters, metal transporters, and unknown proteins. Two T-DNA insertion mutants, At1g63005 (miR399b) and At2g05635 (DEAD helicase RAD3), showed enhanced acidity tolerance. Our GWAS and the reverse genetic approach revealed genes involved in conferring tolerance to coal AMD. Our results indicated that proton resistance in hydroponic conditions could be an important index to improve plant growth in acidic soil, at least in acid-sensitive plant species.
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Raftopoulou C, Roumelioti FM, Dragona E, Gimelli S, Sloan-Béna F, Gorgoulis V, Antonarakis SE, Gagos S. Karyotypic Flexibility of the Complex Cancer Genome and the Role of Polyploidization in Maintenance of Structural Integrity of Cancer Chromosomes. Cancers (Basel) 2020; 12:cancers12030591. [PMID: 32150835 PMCID: PMC7139464 DOI: 10.3390/cancers12030591] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 01/09/2023] Open
Abstract
Ongoing chromosomal instability in neoplasia (CIN) generates intratumor genomic heterogeneity and limits the efficiency of oncotherapeutics. Neoplastic human cells utilizing the alternative lengthening of telomeres (ALT)-pathway, display extensive structural and numerical CIN. To unravel patterns of genome evolution driven by oncogene-replication stress, telomere dysfunction, or genotoxic therapeutic interventions, we examined by comparative genomic hybridization five karyotypically-diverse outcomes of the ALT osteosarcoma cell line U2-OS. These results demonstrate a high tendency of the complex cancer genome to perpetuate specific genomic imbalances despite the karyotypic evolution, indicating an ongoing process of genome dosage maintenance. Molecular karyotyping in four ALT human cell lines showed that mitotic cells with low levels of random structural CIN display frequent evidence of whole genome doubling (WGD), suggesting that WGD may protect clonal chromosome aberrations from hypermutation. We tested this longstanding hypothesis in ALT cells exposed to gamma irradiation or to inducible DNA replication stress under overexpression of p21. Single-cell cytogenomic analyses revealed that although polyploidization promotes genomic heterogeneity, it also protects the complex cancer genome and hence confers genotoxic therapy resistance by generating identical extra copies of driver chromosomal aberrations, which can be spared in the process of tumor evolution if they undergo unstable or unfit rearrangements.
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Affiliation(s)
- Christina Raftopoulou
- Laboratory of Genetics, Center of Experimental Medicine and Translational Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece (BRFAA); (C.R.); (F.-M.R.); (E.D.)
| | - Fani-Marlen Roumelioti
- Laboratory of Genetics, Center of Experimental Medicine and Translational Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece (BRFAA); (C.R.); (F.-M.R.); (E.D.)
| | - Eleni Dragona
- Laboratory of Genetics, Center of Experimental Medicine and Translational Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece (BRFAA); (C.R.); (F.-M.R.); (E.D.)
| | - Stefanie Gimelli
- Department of Genetic Medicine and Development, University of Geneva Medical School, 1211 Geneva, Switzerland; (S.G.); (F.S.-B.); (S.E.A.)
| | - Frédérique Sloan-Béna
- Department of Genetic Medicine and Development, University of Geneva Medical School, 1211 Geneva, Switzerland; (S.G.); (F.S.-B.); (S.E.A.)
| | - Vasilis Gorgoulis
- Histology-Embryology Laboratory, Medical School, National Kapodistrian University of Athens, 11517 Athens, Greece;
| | - Stylianos E. Antonarakis
- Department of Genetic Medicine and Development, University of Geneva Medical School, 1211 Geneva, Switzerland; (S.G.); (F.S.-B.); (S.E.A.)
| | - Sarantis Gagos
- Laboratory of Genetics, Center of Experimental Medicine and Translational Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece (BRFAA); (C.R.); (F.-M.R.); (E.D.)
- Correspondence: ; Tel.: +003-021-0659-7471
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Shemetun OV, Talan OA, Demchenko OM, Kurinnyi DA, Papuga MS, Pilinska MA. Frequency of Spontaneous and Radiation-Induced Chromosomal Aberrations in Peripheral Blood Lymphocytes of Individuals of Different Ages. CYTOL GENET+ 2018. [DOI: 10.3103/s0095452718060117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Kurinnyi DA, Rushkovskyi SR, Demchenko OM, Dybska OB, Pilinska MA. Comparison of the Modifying Action of Astaxanthin on the Development of Radiation-Induced Chromosome Instability in Human Blood Lymphocytes Irradiated in vitro at Different Cell Cycle Stages. CYTOL GENET+ 2018. [DOI: 10.3103/s0095452718050055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Datta A, Brosh RM. New Insights Into DNA Helicases as Druggable Targets for Cancer Therapy. Front Mol Biosci 2018; 5:59. [PMID: 29998112 PMCID: PMC6028597 DOI: 10.3389/fmolb.2018.00059] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 06/06/2018] [Indexed: 12/28/2022] Open
Abstract
Small molecules that deter the functions of DNA damage response machinery are postulated to be useful for enhancing the DNA damaging effects of chemotherapy or ionizing radiation treatments to combat cancer by impairing the proliferative capacity of rapidly dividing cells that accumulate replicative lesions. Chemically induced or genetic synthetic lethality is a promising area in personalized medicine, but it remains to be optimized. A new target in cancer therapy is DNA unwinding enzymes known as helicases. Helicases play critical roles in all aspects of nucleic acid metabolism. We and others have investigated small molecule targeted inhibition of helicase function by compound screens using biochemical and cell-based approaches. Small molecule-induced trapping of DNA helicases may represent a generalized mechanism exemplified by certain topoisomerase and PARP inhibitors that exert poisonous consequences, especially in rapidly dividing cancer cells. Taking the lead from the broader field of DNA repair inhibitors and new information gleaned from structural and biochemical studies of DNA helicases, we predict that an emerging strategy to identify useful helicase-interacting compounds will be structure-based molecular docking interfaced with a computational approach. Potency, specificity, drug resistance, and bioavailability of helicase inhibitor drugs and targeting such compounds to subcellular compartments where the respective helicases operate must be addressed. Beyond cancer therapy, continued and new developments in this area may lead to the discovery of helicase-interacting compounds that chemically rescue clinically relevant helicase missense mutant proteins or activate the catalytic function of wild-type DNA helicases, which may have novel therapeutic application.
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Affiliation(s)
- Arindam Datta
- Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, NIH Biomedical Research Center, Baltimore, MD, United States
| | - Robert M Brosh
- Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, NIH Biomedical Research Center, Baltimore, MD, United States
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Structure and function of Pif1 helicase. Biochem Soc Trans 2017; 45:1159-1171. [PMID: 28900015 DOI: 10.1042/bst20170096] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Revised: 08/10/2017] [Accepted: 08/11/2017] [Indexed: 12/18/2022]
Abstract
Pif1 family helicases have multiple roles in the maintenance of nuclear and mitochondrial DNA in eukaryotes. Saccharomyces cerevisiae Pif1 is involved in replication through barriers to replication, such as G-quadruplexes and protein blocks, and reduces genetic instability at these sites. Another Pif1 family helicase in S. cerevisiae, Rrm3, assists in fork progression through replication fork barriers at the rDNA locus and tRNA genes. ScPif1 (Saccharomyces cerevisiae Pif1) also negatively regulates telomerase, facilitates Okazaki fragment processing, and acts with polymerase δ in break-induced repair. Recent crystal structures of bacterial Pif1 helicases and the helicase domain of human PIF1 combined with several biochemical and biological studies on the activities of Pif1 helicases have increased our understanding of the function of these proteins. This review article focuses on these structures and the mechanism(s) proposed for Pif1's various activities on DNA.
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Abstract
This introductory article should be viewed as a prologue to the Free Radical Biology & Medicine Special Issue devoted to the important topic of Oxidatively Damaged DNA and its Repair. This special issue is dedicated to Professor Tomas Lindahl, co-winner of the 2015 Nobel Prize in Chemistry for his seminal discoveries in the area repair of oxidatively damaged DNA. In the past several years it has become abundantly clear that DNA oxidation is a major consequence of life in an oxygen-rich environment. Concomitantly, survival in the presence of oxygen, with the constant threat of deleterious DNA mutations and deletions, has largely been made possible through the evolution of a vast array of DNA repair enzymes. The articles in this Oxidatively Damaged DNA & Repair special issue detail the reactions by which intracellular DNA is oxidatively damaged, and the enzymatic reactions and pathways by which living organisms survive such assaults by repair processes.
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Affiliation(s)
- Jean Cadet
- Département de Médecine Nucléaire et Radiobiologie, Faculté de Médecine de des Sciences de la Santé, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - Kelvin J A Davies
- Leonard Davis School of Gerontology of the Ethel Percy Andrus Gerontology Center, the University of Southern California, Los Angeles, CA 90089-0191, USA; Division of Molecular & Computational Biology, Department of Biological Sciences of the Dornsife College of Letters, Arts, and Sciences, the University of Southern California, Los Angeles, CA 90089-0191, USA.
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