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Kundnani DL, Yang T, Gombolay AL, Mukherjee K, Newnam G, Meers C, Verma I, Chhatlani K, Mehta ZH, Mouawad C, Storici F. Distinct features of ribonucleotides within genomic DNA in Aicardi-Goutières syndrome ortholog mutants of Saccharomyces cerevisiae. iScience 2024; 27:110012. [PMID: 38868188 PMCID: PMC11166700 DOI: 10.1016/j.isci.2024.110012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 03/15/2024] [Accepted: 05/14/2024] [Indexed: 06/14/2024] Open
Abstract
Ribonucleoside monophosphates (rNMPs) are abundantly found within genomic DNA of cells. The embedded rNMPs alter DNA properties and impact genome stability. Mutations in ribonuclease (RNase) H2, a key enzyme for rNMP removal, are associated with the Aicardi-Goutières syndrome (AGS), a severe neurological disorder. Here, we engineered orthologs of the human RNASEH2A-G37S and RNASEH2C-R69W AGS mutations in yeast Saccharomyces cerevisiae: rnh201-G42S and rnh203-K46W. Using the ribose-seq technique and the Ribose-Map bioinformatics toolkit, we unveiled rNMP abundance, composition, hotspots, and sequence context in these AGS-ortholog mutants. We found a high rNMP presence in the nuclear genome of rnh201-G42S-mutant cells, and an elevated rCMP content in both mutants, reflecting preferential cleavage of RNase H2 at rGMP. We discovered unique rNMP patterns in each mutant, showing differential activity of the AGS mutants on the leading or lagging replication strands. This study guides future research on rNMP characteristics in human genomes with AGS mutations.
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Affiliation(s)
- Deepali L. Kundnani
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Taehwan Yang
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Alli L. Gombolay
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
- Bacterial Special Pathogens Branch, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
| | - Kuntal Mukherjee
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Gary Newnam
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Chance Meers
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA
| | - Ishika Verma
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Kirti Chhatlani
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Zeel H. Mehta
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Celine Mouawad
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Francesca Storici
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
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2
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Thuner J, Cognard J, Belot A. How to treat monogenic SLE? Best Pract Res Clin Rheumatol 2024:101962. [PMID: 38876818 DOI: 10.1016/j.berh.2024.101962] [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: 04/01/2024] [Revised: 05/12/2024] [Accepted: 05/29/2024] [Indexed: 06/16/2024]
Abstract
Systemic lupus erythematosus is a rare and life-threatening autoimmune disease characterized by autoantibodies against double-stranded DNA, with an immunopathology that remains partially unclear. New insights into the disease have been provided by the discovery of key mutations leading to the development of monogenic SLE, occurring in the context of early-onset disease, syndromic lupus, or familial clustering. The increased frequency of discovering these mutations in recent years, thanks to the advent of genetic screening, has greatly enhanced our understanding of the immunopathogenesis of SLE. These monogenic defects include defective clearance of apoptotic bodies, abnormalities in nucleic acid sensing, activation of the type-I interferon pathway, and the breakdown of tolerance through B or T cell activation or lymphocyte proliferation due to anomalies in TLR signalling and/or NFκB pathway overactivation. The translation of genetic discoveries into therapeutic strategies is presented here, within the framework of personalized therapy.
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Affiliation(s)
- Jonathan Thuner
- Internal Medicine Department, Lyon-Sud Hospital, Hospices Civils de Lyon, Pierre-Bénite, France; CIRI, Centre International de Recherche en Infectiologie/International Center for Infectiology Research, Université de Lyon, INSERM, Institut National de La Santé Et de La Recherche Médicale, U1111, Université Claude Bernard Lyon 1, Lyon, France
| | - Jade Cognard
- Pediatric Rheumatology, Nephrology, Dermatology Department, CMR RAISE, Women-Mother-Child Hospital, Hospices Civils de Lyon, Bron, France; CIRI, Centre International de Recherche en Infectiologie/International Center for Infectiology Research, Université de Lyon, INSERM, Institut National de La Santé Et de La Recherche Médicale, U1111, Université Claude Bernard Lyon 1, Lyon, France
| | - Alexandre Belot
- Pediatric Rheumatology, Nephrology, Dermatology Department, CMR RAISE, Women-Mother-Child Hospital, Hospices Civils de Lyon, Bron, France; CIRI, Centre International de Recherche en Infectiologie/International Center for Infectiology Research, Université de Lyon, INSERM, Institut National de La Santé Et de La Recherche Médicale, U1111, Université Claude Bernard Lyon 1, Lyon, France; CNRS, Centre National de La Recherche Scientifique, UMR5308, Lyon, France.
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3
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Kundnani DL, Yang T, Gombolay AL, Mukherjee K, Newnam G, Meers C, Mehta ZH, Mouawad C, Storici F. Distinct features of ribonucleotides within genomic DNA in Aicardi-Goutières syndrome (AGS)-ortholog mutants of Saccharomyces cerevisiae. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.02.560505. [PMID: 37873120 PMCID: PMC10592897 DOI: 10.1101/2023.10.02.560505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Ribonucleoside monophosphates (rNMPs) are abundantly found within genomic DNA of cells. The embedded rNMPs alter DNA properties and impact genome stability. Mutations in ribonuclease (RNase) H2, a key enzyme for rNMP removal, are associated with the Aicardi-Goutières syndrome (AGS), a severe neurological disorder. Here, we engineered two AGS-ortholog mutations in Saccharomyces cerevisiae: rnh201-G42S and rnh203-K46W. Using the ribose-seq technique and the Ribose-Map bioinformatics toolkit, we unveiled rNMP abundance, composition, hotspots, and sequence context in these yeast AGS-ortholog mutants. We found higher rNMP incorporation in the nuclear genome of rnh201-G42S than in wild-type and rnh203-K46W-mutant cells, and an elevated rCMP content in both mutants. Moreover, we uncovered unique rNMP patterns in each mutant, highlighting a differential activity of the AGS mutants towards rNMPs embedded on the leading or on the lagging strand of DNA replication. This study guides future research on rNMP characteristics in human genomic samples carrying AGS mutations.
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Affiliation(s)
- Deepali L Kundnani
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Taehwan Yang
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Alli L Gombolay
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
- Bacterial Special Pathogens Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Kuntal Mukherjee
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Gary Newnam
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Chance Meers
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA
| | - Zeel H Mehta
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Celine Mouawad
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Francesca Storici
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
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4
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Jia X, Tan L, Chen S, Tang R, Chen W. Monogenic lupus: Tracing the therapeutic implications from single gene mutations. Clin Immunol 2023; 254:109699. [PMID: 37481012 DOI: 10.1016/j.clim.2023.109699] [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: 04/19/2023] [Revised: 06/21/2023] [Accepted: 07/18/2023] [Indexed: 07/24/2023]
Abstract
Monogenic lupus, a distinctive variant of systemic lupus erythematosus (SLE), is characterized by early onset, family-centric clustering, and heightened disease severity. So far, over thirty genetic variations have been identified as single-gene etiology of SLE and lupus-like phenotypes. The critical role of these gene mutations in disrupting various immune pathways is increasingly recognized. In particular, single gene mutation-driven dysfunction within the innate immunity, notably deficiencies in the complement system, impedes the degradation of free nucleic acid and immune complexes, thereby promoting activation of innate immune cells. The accumulation of these components in various tissues and organs creates a pro-inflammatory microenvironment, characterized by a surge in pro-inflammatory cytokines, chemokines, reactive oxygen species, and type I interferons. Concurrently, single gene mutation-associated defects in the adaptive immune system give rise to the emergence of autoreactive T cells, hyperactivated B cells and plasma cells. The ensuing spectrum of cytokines and autoimmune antibodies drives systemic disease manifestations, primarily including kidney, skin and central nervous system-related phenotypes. This review provides a thorough overview of the single gene mutations and potential consequent immune dysregulations in monogenic lupus, elucidating the pathogenic mechanisms of monogenic lupus. Furthermore, it discusses the recent advances made in the therapeutic interventions for monogenic lupus.
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Affiliation(s)
- Xiuzhi Jia
- Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; NHC Key Laboratory of Clinical Nephrology (Sun Yat-Sen University) and Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - Li Tan
- Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; NHC Key Laboratory of Clinical Nephrology (Sun Yat-Sen University) and Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - Sixiu Chen
- Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; NHC Key Laboratory of Clinical Nephrology (Sun Yat-Sen University) and Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China
| | - Ruihan Tang
- Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; NHC Key Laboratory of Clinical Nephrology (Sun Yat-Sen University) and Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China.
| | - Wei Chen
- Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China; NHC Key Laboratory of Clinical Nephrology (Sun Yat-Sen University) and Guangdong Provincial Key Laboratory of Nephrology, Guangzhou 510080, China.
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5
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Tsai KD, Lee YC, Chen BY, Wu LS, Liang SY, Liu MY, Hung YW, Hsu HL, Chen PQ, Shieh JC, Lee YJ, Lin TH. Recombinant Klotho attenuates IFNγ receptor signaling and SAMHD1 expression through blocking NF-κB translocation in glomerular mesangial cells. Int J Med Sci 2023; 20:810-817. [PMID: 37213666 PMCID: PMC10198147 DOI: 10.7150/ijms.78279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 03/30/2023] [Indexed: 05/23/2023] Open
Abstract
Interferon gamma (IFNγ) is a cytokine implicated in the pathogenesis of autoimmune diseases. SAM and HD domain-containing protein 1 (SAMHD1) is an IFNγ-inducible protein that modulates cellular dNTP levels. Mutations in the human SAMHD1 gene cause Aicardi-Goutières (AG) syndrome, an autoimmune disease sharing similar clinical features with systemic lupus erythematosus (SLE). Klotho is an anti-inflammatory protein which suppresses aging through multiple mechanisms. Implication of Klotho in autoimmune response is identified in rheumatologic diseases such as SLE. Little information exists regarding the effect of Klotho in lupus nephritis, one of the prevalent symptoms of SLE. The present study verified the effect of IFNγ on SAMHD1 and Klotho expression in MES-13 glomerular mesangial cells, a special cell type in glomerulus that is critically involved in lupus nephritis. IFNγ upregulated SAMHD1 expression in MES-13 cells through the Janus kinase-signal transducer and activator of transcription 1 (JAK-STAT1) and the nuclear factor kappa B (NFκB) signaling pathways. IFNγ decreased Klotho protein expression in MES-13 cells. Treatment of MES-13 cells with recombinant Klotho protein inhibited SAMHD1 expression by blocking IFNγ-induced NFκB nuclear translocation, but showed no effect on JAK-STAT1 signaling. Collectively, our findings support the protective role of Klotho in attenuating lupus nephritis through the inhibition of IFNγ-induced SAMHD1 expression and IFNγ downstream signaling in MES-13 cells.
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Affiliation(s)
- Kuen-Daw Tsai
- Department of Internal Medicine, China Medical University Beigang Hospital, 123 Sinde Road, Beigang Township, Yunlin County, 65152, Taiwan, ROC
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, 91 Hsueh-Shih Road, Taichung, 40402, Taiwan, ROC
| | - Yi-Chao Lee
- Ph.D. Program in Medical Neuroscience, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan
| | - Bo-Yu Chen
- School of Biomedical Sciences, College of Medical Science and Technology, Chung Shan Medical University; Department of Medical Research, Chung Shan Medical University Hospital, 110 Jianguo North Road, Section 1, Taichung 40203, Taiwan, ROC
| | - Li-Syuan Wu
- School of Biomedical Sciences, College of Medical Science and Technology, Chung Shan Medical University; Department of Medical Research, Chung Shan Medical University Hospital, 110 Jianguo North Road, Section 1, Taichung 40203, Taiwan, ROC
| | - Shan-Yuan Liang
- School of Biomedical Sciences, College of Medical Science and Technology, Chung Shan Medical University; Department of Medical Research, Chung Shan Medical University Hospital, 110 Jianguo North Road, Section 1, Taichung 40203, Taiwan, ROC
| | - Ming-Yuan Liu
- School of Biomedical Sciences, College of Medical Science and Technology, Chung Shan Medical University; Department of Medical Research, Chung Shan Medical University Hospital, 110 Jianguo North Road, Section 1, Taichung 40203, Taiwan, ROC
| | - Yu-Wen Hung
- School of Biomedical Sciences, College of Medical Science and Technology, Chung Shan Medical University; Department of Medical Research, Chung Shan Medical University Hospital, 110 Jianguo North Road, Section 1, Taichung 40203, Taiwan, ROC
| | - Hui-Ling Hsu
- Department of Respiratory Therapy, China Medical University Beigang Hospital, 123 Sinde Road, Beigang Township, Yunlin County, 65152, Taiwan, ROC
| | - Pei-Qi Chen
- School of Biomedical Sciences, College of Medical Science and Technology, Chung Shan Medical University; Department of Medical Research, Chung Shan Medical University Hospital, 110 Jianguo North Road, Section 1, Taichung 40203, Taiwan, ROC
| | - Jia-Ching Shieh
- School of Biomedical Sciences, College of Medical Science and Technology, Chung Shan Medical University; Department of Medical Research, Chung Shan Medical University Hospital, 110 Jianguo North Road, Section 1, Taichung 40203, Taiwan, ROC
| | - Yi-Ju Lee
- Institute of Medicine, Chung Shan Medical University, 110 Jianguo North Road, Section 1, Taichung 40203, Taiwan, ROC
- ✉ Corresponding authors: (T.-H.L.); (Y.-J.L.); Tel.: +886-4-24730022 (ext.11805) (T.-H.L.); +886-4-24730022 (ext. 12008) (Y.-J.L.)
| | - Ting-Hui Lin
- School of Biomedical Sciences, College of Medical Science and Technology, Chung Shan Medical University; Department of Medical Research, Chung Shan Medical University Hospital, 110 Jianguo North Road, Section 1, Taichung 40203, Taiwan, ROC
- ✉ Corresponding authors: (T.-H.L.); (Y.-J.L.); Tel.: +886-4-24730022 (ext.11805) (T.-H.L.); +886-4-24730022 (ext. 12008) (Y.-J.L.)
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6
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Masumoto J, Zhou W, Morikawa S, Hosokawa S, Taguchi H, Yamamoto T, Kurata M, Kaneko N. Molecular biology of autoinflammatory diseases. Inflamm Regen 2021; 41:33. [PMID: 34635190 PMCID: PMC8507398 DOI: 10.1186/s41232-021-00181-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 09/09/2021] [Indexed: 12/25/2022] Open
Abstract
The long battle between humans and various physical, chemical, and biological insults that cause cell injury (e.g., products of tissue damage, metabolites, and/or infections) have led to the evolution of various adaptive responses. These responses are triggered by recognition of damage-associated molecular patterns (DAMPs) and/or pathogen-associated molecular patterns (PAMPs), usually by cells of the innate immune system. DAMPs and PAMPs are recognized by pattern recognition receptors (PRRs) expressed by innate immune cells; this recognition triggers inflammation. Autoinflammatory diseases are strongly associated with dysregulation of PRR interactomes, which include inflammasomes, NF-κB-activating signalosomes, type I interferon-inducing signalosomes, and immuno-proteasome; disruptions of regulation of these interactomes leads to inflammasomopathies, relopathies, interferonopathies, and proteasome-associated autoinflammatory syndromes, respectively. In this review, we discuss the currently accepted molecular mechanisms underlying several autoinflammatory diseases.
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Affiliation(s)
- Junya Masumoto
- Department of Pathology, Ehime University Graduate School of Medicine and Proteo-Science Center, Shitsukawa 454, Toon, Ehime, 791-0295, Japan.
| | - Wei Zhou
- Department of Pathology, Ehime University Graduate School of Medicine and Proteo-Science Center, Shitsukawa 454, Toon, Ehime, 791-0295, Japan
| | - Shinnosuke Morikawa
- Department of Pathology, Ehime University Graduate School of Medicine and Proteo-Science Center, Shitsukawa 454, Toon, Ehime, 791-0295, Japan
| | - Sho Hosokawa
- Department of Pathology, Ehime University Graduate School of Medicine and Proteo-Science Center, Shitsukawa 454, Toon, Ehime, 791-0295, Japan
| | - Haruka Taguchi
- Department of Pathology, Ehime University Graduate School of Medicine and Proteo-Science Center, Shitsukawa 454, Toon, Ehime, 791-0295, Japan
| | - Toshihiro Yamamoto
- Department of Pathology, Ehime University Graduate School of Medicine and Proteo-Science Center, Shitsukawa 454, Toon, Ehime, 791-0295, Japan
| | - Mie Kurata
- Department of Pathology, Ehime University Graduate School of Medicine and Proteo-Science Center, Shitsukawa 454, Toon, Ehime, 791-0295, Japan
| | - Naoe Kaneko
- Department of Pathology, Ehime University Graduate School of Medicine and Proteo-Science Center, Shitsukawa 454, Toon, Ehime, 791-0295, Japan
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McWhirter SM, Jefferies CA. Nucleic Acid Sensors as Therapeutic Targets for Human Disease. Immunity 2021; 53:78-97. [PMID: 32668230 DOI: 10.1016/j.immuni.2020.04.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/26/2020] [Accepted: 04/14/2020] [Indexed: 12/11/2022]
Abstract
Innate immune sensors that detect nucleic acids are attractive targets for therapeutic intervention because of their diverse roles in many disease processes. In detecting RNA and DNA from either self or non-self, nucleic acid sensors mediate the pathogenesis of many autoimmune and inflammatory conditions. Despite promising pre-clinical data and investigational use in the clinic, relatively few drugs targeting nucleic acid sensors are approved for therapeutic use. Nevertheless, there is growing appreciation for the untapped potential of nucleic acid sensors as therapeutic targets, driven by the need for better therapies for cancer, infectious diseases, and autoimmune disorders. This review highlights the diverse mechanisms by which nucleic acid sensors are activated and exert their biological effects in the context of various disease settings. We discuss current therapeutic strategies utilizing agonists and antagonists targeting nucleic acid sensors to treat infectious disease, cancer, and autoimmune and inflammatory disorders.
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Affiliation(s)
| | - Caroline A Jefferies
- Department of Biomedical Sciences and Department of Medicine, Division of Rheumatology, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
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Cerritelli SM, El Hage A. RNases H1 and H2: guardians of the stability of the nuclear genome when supply of dNTPs is limiting for DNA synthesis. Curr Genet 2020; 66:1073-1084. [PMID: 32886170 DOI: 10.1007/s00294-020-01086-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 05/30/2020] [Accepted: 06/01/2020] [Indexed: 11/29/2022]
Abstract
RNA/DNA hybrids are processed by RNases H1 and H2, while single ribonucleoside-monophosphates (rNMPs) embedded in genomic DNA are removed by the error-free, RNase H2-dependent ribonucleotide excision repair (RER) pathway. In the absence of RER, however, topoisomerase 1 (Top1) can cleave single genomic rNMPs in a mutagenic manner. In RNase H2-deficient mice, the accumulation of genomic rNMPs above a threshold of tolerance leads to catastrophic genomic instability that causes embryonic lethality. In humans, deficiencies in RNase H2 induce the autoimmune disorders Aicardi-Goutières syndrome and systemic lupus erythematosus, and cause skin and intestinal cancers. Recently, we reported that in Saccharomyces cerevisiae, the depletion of Rnr1, the major catalytic subunit of ribonucleotide reductase (RNR), which converts ribonucleotides to deoxyribonucleotides, leads to cell lethality in absence of RNases H1 and H2. We hypothesized that under replicative stress and compromised DNA repair that are elicited by an insufficient supply of deoxyribonucleoside-triphosphates (dNTPs), cells cannot survive the accumulation of persistent RNA/DNA hybrids. Remarkably, we found that cells lacking RNase H2 accumulate ~ 5-fold more genomic rNMPs in absence than in presence of Rnr1. When the load of genomic rNMPs is further increased in the presence of a replicative DNA polymerase variant that over-incorporates rNMPs in leading or lagging strand, cells missing both Rnr1 and RNase H2 suffer from severe growth defects. These are reversed in absence of Top1. Thus, in cells lacking RNase H2 and containing a limiting supply of dNTPs, there is a threshold of tolerance for the accumulation of genomic ribonucleotides that is tightly associated with Top1-mediated DNA damage. In this mini-review, we describe the implications of the loss of RNase H2, or RNases H1 and H2, on the integrity of the nuclear genome and viability of budding yeast cells that are challenged with a critically low supply of dNTPs. We further propose that our findings in budding yeast could pave the way for the study of the potential role of mammalian RNR in RNase H2-related diseases.
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Affiliation(s)
- Susana M Cerritelli
- SFR, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
| | - Aziz El Hage
- The Wellcome Centre for Cell Biology, University of Edinburgh, Edinburgh, UK.
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9
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Zhang Z, Zheng L, Yu Y, Wu J, Yang F, Xu Y, Guo Q, Wu X, Cao S, Cao L, Song X. Involvement of SAMHD1 in dNTP homeostasis and the maintenance of genomic integrity and oncotherapy (Review). Int J Oncol 2020; 56:879-888. [PMID: 32319570 DOI: 10.3892/ijo.2020.4988] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 02/07/2020] [Indexed: 11/06/2022] Open
Abstract
Sterile alpha motif and histidine/aspartic acid domain‑containing protein 1 (SAMHD1), the only deoxynucleotide triphosphate (dNTP) hydrolase in eukaryotes, plays a crucial role in regulating the dynamic balance and ratio of cellular dNTP pools. Furthermore, SAMHD1 has been reported to be involved in the pathological process of several diseases. Homozygous SAMHD1 mutations have been identified in immune system disorders, such as autoimmune disease Aicardi‑Goutières syndrome (AGS), whose primary pathogenesis is associated with the abnormal accumulation and disproportion of dNTPs. SAMHD1 is also considered to be an intrinsic virus‑restriction factor by suppressing the viral infection process, including reverse transcription, replication, packaging and transmission. In addition, SAMHD1 has been shown to promote genome integrity during homologous recombination following DNA damage, thus being considered a promising candidate for oncotherapy applications. The present review summarizes the molecular mechanisms of SAMHD1 regarding the regulation of dNTP homeostasis and DNA damage response. Additionally, its potential effects on tumorigenesis and oncotherapy are reported.
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Affiliation(s)
- Zhou Zhang
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Lixia Zheng
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Yang Yu
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Jinying Wu
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Fan Yang
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Yingxi Xu
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Qiqiang Guo
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Xuan Wu
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Sunrun Cao
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Liu Cao
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
| | - Xiaoyu Song
- College of Basic Medical Science, Institute of Translational Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China
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10
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Tonduti D, Fazzi E, Badolato R, Orcesi S. Novel and emerging treatments for Aicardi-Goutières syndrome. Expert Rev Clin Immunol 2020; 16:189-198. [PMID: 31855085 DOI: 10.1080/1744666x.2019.1707663] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Introduction: Aicardi-Goutières syndrome (AGS) is the prototype of the type I interferonopathies, a new heterogeneous group of autoinflammatory disorders in which type I interferon plays a pivotal role. The disease usually manifests itself during infancy, primarily affecting the brain and the skin, and is characterized by cerebrospinal fluid chronic lymphocytosis and raised levels of interferon-alpha and by cardinal neuroradiological features: cerebral calcification, leukoencephalopathy and cerebral atrophy. Recently many aspects of the pathogenesis of AGS have been clarified, making it possible to hypothesize new therapeutic strategies.Areas covered: We here review recent data concerning pathogenesis and novel therapeutic strategies in AGS, including the use of Janus kinase inhibitors, reverse transcriptase inhibitors, anti-IFN-α antibodies, anti-interleukin antibodies, antimalarial drugs and other cGAS inhibitors.Expert opinion: Thanks to the identification of the molecular basis of AGS, many aspects of its pathogenesis have been clarified, making it possible to propose new therapeutic strategies for AGS and type I interferonopathies. A number of therapeutic options are now becoming possible, even though their efficacy is still to be proven. However, in spite of research advances coming from clinical trials and case series, there are still a number of open questions, which urgently need to be addressed.
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Affiliation(s)
- Davide Tonduti
- Paediatric Neurology Unit, V. Buzzi Children's Hospital, Milan, Italy
| | - Elisa Fazzi
- Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.,Unit of Child Neurology and Psychiatry, ASST Spedali Civili of Brescia, Brescia, Italy
| | - Raffaele Badolato
- Molecular Medicine Institute "Angelo Nocivelli" and Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - Simona Orcesi
- Department of Brain and Behavioural Sciences, University of Pavia, Pavia, Italy.,Unit of Child and Adolescent Neurology, IRCCS Mondino Foundation, Pavia, Italy
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11
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Wang C, Wang G, Feng X, Shepherd P, Zhang J, Tang M, Chen Z, Srivastava M, McLaughlin ME, Navone NM, Hart GT, Chen J. Genome-wide CRISPR screens reveal synthetic lethality of RNASEH2 deficiency and ATR inhibition. Oncogene 2019; 38:2451-2463. [PMID: 30532030 PMCID: PMC6450769 DOI: 10.1038/s41388-018-0606-4] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 10/30/2018] [Accepted: 11/14/2018] [Indexed: 12/16/2022]
Abstract
Ataxia telangiectasia mutated and RAD3 related (ATR) protein kinase plays critical roles in ensuring DNA replication, DNA repair, and cell cycle control in response to replication stress, making ATR inhibition a promising therapeutic strategy for cancer treatment. To identify genes whose loss makes tumor cells hypersensitive to ATR inhibition, we performed CRISPR/Cas9-based whole-genome screens in 3 independent cell lines treated with a highly selective ATR inhibitor, AZD6738. These screens uncovered a comprehensive genome-wide profile of ATR inhibitor sensitivity. From the candidate genes, we demonstrated that RNASEH2 deficiency is synthetic lethal with ATR inhibition both in vitro and in vivo. RNASEH2-deficient cells exhibited elevated levels of DNA damage and, when treated with AZD6738, underwent apoptosis (short-time treated) or senescence (long-time treated). Notably, RNASEH2 deficiency is frequently found in prostate adenocarcinoma; we found decreased RNASEH2B protein levels in prostate adenocarcinoma patient-derived xenograft (PDX) samples. Our findings suggest that ATR inhibition may be beneficial for cancer patients with reduced levels of RNASEH2 and that RNASEH2 merits further exploration as a potential biomarker for ATR inhibitor-based therapy.
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Affiliation(s)
- Chao Wang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Gang Wang
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Xu Feng
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Peter Shepherd
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Jie Zhang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Mengfan Tang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Zhen Chen
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Mrinal Srivastava
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Megan E McLaughlin
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Nora M Navone
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Glen Traver Hart
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Junjie Chen
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.
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12
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Vanpouille-Box C, Demaria S, Formenti SC, Galluzzi L. Cytosolic DNA Sensing in Organismal Tumor Control. Cancer Cell 2018; 34:361-378. [PMID: 30216189 DOI: 10.1016/j.ccell.2018.05.013] [Citation(s) in RCA: 178] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 04/11/2018] [Accepted: 05/30/2018] [Indexed: 02/07/2023]
Abstract
Besides constituting a first layer of defense against microbial challenges, the detection of cytosolic DNA is fundamental for mammalian organisms to control malignant transformation and tumor progression. The accumulation of DNA in the cytoplasm can initiate the proliferative inactivation (via cellular senescence) or elimination (via regulated cell death) of neoplastic cell precursors. Moreover, cytosolic DNA sensing is intimately connected to the secretion of cytokines that support innate and adaptive antitumor immunity. Here, we discuss the molecular mechanisms whereby cytosolic DNA enables cell-intrinsic and -extrinsic oncosuppression, and their relevance for the development of novel therapeutic approaches that reinstate anticancer immunosurveillance.
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Affiliation(s)
- Claire Vanpouille-Box
- Department of Radiation Oncology, Weill Cornell Medical College, Stich Radiation Oncology, 525 East 68th Street, Box #169, New York, NY 10065, USA
| | - Sandra Demaria
- Department of Radiation Oncology, Weill Cornell Medical College, Stich Radiation Oncology, 525 East 68th Street, Box #169, New York, NY 10065, USA; Sandra and Edward Meyer Cancer Center, New York, NY, USA; Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY, USA
| | - Silvia C Formenti
- Department of Radiation Oncology, Weill Cornell Medical College, Stich Radiation Oncology, 525 East 68th Street, Box #169, New York, NY 10065, USA; Sandra and Edward Meyer Cancer Center, New York, NY, USA
| | - Lorenzo Galluzzi
- Department of Radiation Oncology, Weill Cornell Medical College, Stich Radiation Oncology, 525 East 68th Street, Box #169, New York, NY 10065, USA; Sandra and Edward Meyer Cancer Center, New York, NY, USA; Université Paris Descartes/Paris V, Paris, France.
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13
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DNA Damage and Deficiencies in the Mechanisms of Its Repair: Implications in the Pathogenesis of Systemic Lupus Erythematosus. J Immunol Res 2018; 2018:8214379. [PMID: 30116756 PMCID: PMC6079408 DOI: 10.1155/2018/8214379] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 05/30/2018] [Accepted: 06/13/2018] [Indexed: 12/19/2022] Open
Abstract
Systemic lupus erythematosus (SLE) is a perplexing and potentially severe disease, the pathogenesis of which is yet to be understood. SLE is considered to be a multifactorial disease, in which genetic factors, immune dysregulation, and environmental factors, such as ultraviolet radiation, are involved. Recently, the description of novel genes conferring susceptibility to develop SLE even in their own (monogenic lupus) has raised the interest in DNA dynamics since many of these genes are linked to DNA repair. Damage to DNA induces an inflammatory response and eventually triggers an immune response, including those targeting self-antigens. We review the evidence that indicates that patients with SLE present higher levels of DNA damage than normal subjects do and that several proteins involved in the preservation of the genomic stability show polymorphisms, some of which increase the risk for SLE development. Also, the experience from animal models reinforces the connection between DNA damage and defective repair in the development of SLE-like disease including characteristic features such as anti-DNA antibodies and nephritis. Defining the role of DNA damage response in SLE pathogenesis might be strategic in the quest for novel therapies.
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