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Szeltner Z, Ferenc G, Juhász T, Kupihár Z, Váradi Z, Szüts D, Kovács L. Probing telomeric-like G4 structures with full or partial 2'-deoxy-5-hydroxyuridine substitutions. Biochimie 2023; 214:33-44. [PMID: 36707016 DOI: 10.1016/j.biochi.2023.01.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 12/16/2022] [Accepted: 01/14/2023] [Indexed: 01/26/2023]
Abstract
Guanine quadruplexes (G4s) are stable four-stranded secondary DNA structures held together by noncanonical G-G base tetrads. We synthesised the nucleoside analogue 2'-deoxy-5-hydroxyuridine (H) and inserted its phosphoramidite into telomeric repeat-type model oligonucleotides. Full and partial substitutions were made, replacing all guanines in all the three tetrads of a three-tier G4 structure, or only in the putative upper, central, or lower tetrads. We characterised these modified structures using CD, UV absorbance spectroscopy, native gel studies, and a capture oligo-based G4 disruption kinetic assay. The strand separation activity of BLM helicase on these substituted structures was also investigated. Two of the partially H-substituted constructs adopted G4-like structures, but displayed lower thermal stabilities compared to unsubstituted G4. The construct modified in its central tetrad remained mostly denatured, but the possibility of a special structure for the fully replaced variant remained open. H substitutions did not interfere with the G4-resolving activity of BLM helicase, but its efficiency was highly influenced by construct topology and even more by the G4 ligand PhenDC3. Our results suggest that the H modification can be incorporated into G quadruplexes, but only at certain positions to maintain G4 stability. The destabilizing effect observed for 2'-deoxy-5-hydroxyuridine indicates that the cytosine deamination product 5-hydroxyuracil and its nucleoside counterpart in RNA (5-hydroxyuridine), might also be destabilizing in cellular DNA and RNA quadruplexes. The kinetic assay employed in this study can be generally employed for a fast comparison of the stabilities of various G4s either in their free or ligand-bound states.
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Affiliation(s)
- Zoltán Szeltner
- Institute of Enzymology, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117, Budapest, Hungary
| | - Györgyi Ferenc
- Nucleic Acid Synthesis Laboratory, Biological Research Centre, Eötvös Loránd Research Network, Temesvári Krt. 62, H-6726, Szeged, Hungary
| | - Tünde Juhász
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117, Budapest, Hungary
| | - Zoltán Kupihár
- Department of Medicinal Chemistry, University of Szeged, Dom Tér 8, H-6720, Szeged, Hungary
| | - Zoltán Váradi
- Department of Medicinal Chemistry, University of Szeged, Dom Tér 8, H-6720, Szeged, Hungary
| | - Dávid Szüts
- Institute of Enzymology, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117, Budapest, Hungary.
| | - Lajos Kovács
- Department of Medicinal Chemistry, University of Szeged, Dom Tér 8, H-6720, Szeged, Hungary.
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2
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Cheng A, Liu C, Ye W, Huang D, She W, Liu X, Fung CP, Xu N, Suen MC, Ye W, Sung HHY, Williams ID, Zhu G, Qian PY. Selective C9orf72 G-Quadruplex-Binding Small Molecules Ameliorate Pathological Signatures of ALS/FTD Models. J Med Chem 2022; 65:12825-12837. [PMID: 36226410 PMCID: PMC9574859 DOI: 10.1021/acs.jmedchem.2c00654] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The G-quadruplex (G4) forming C9orf72 GGGGCC (G4C2) expanded hexanucleotide repeat (EHR)
is the predominant genetic cause of amyotrophic lateral sclerosis
(ALS) and frontotemporal dementia (FTD). Developing selective G4-binding
ligands is challenging due to the conformational polymorphism and
similarity of G4 structures. We identified three first-in-class marine
natural products, chrexanthomycin A (cA), chrexanthomycin
B (cB), and chrexanthomycin C (cC), with
remarkable bioactivities. Thereinto, cA shows the highest
permeability and lowest cytotoxicity to live cells. NMR titration
experiments and in silico analysis demonstrate that cA, cB, and cC selectively bind
to DNA and RNA G4C2 G4s. Notably, cA and cC dramatically reduce G4C2 EHR-caused cell death, diminish G4C2 RNA
foci in (G4C2)29-expressing Neuro2a cells, and significantly
eliminate ROS in HT22 cells. In (G4C2)29-expressing Drosophila, cA and cC significantly
rescue eye degeneration and improve locomotor deficits. Overall, our
findings reveal that cA and cC are potential
therapeutic agents deserving further clinical study.
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Affiliation(s)
- Aifang Cheng
- Department of Ocean Science and Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
| | - Changdong Liu
- Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Shenzhen Research Institute, The Hong Kong University of Science and Technology, Hi-Tech Park, Nanshan, Shenzhen 518057, China
| | - Wenkang Ye
- Department of Ocean Science and Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
- SZU-HKUST Joint Ph.D. Program in Marine Environmental Science, Shenzhen University, Shenzhen 518060, China
| | - Duli Huang
- Department of Ocean Science and Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
| | - Weiyi She
- Department of Ocean Science and Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
- SZU-HKUST Joint Ph.D. Program in Marine Environmental Science, Shenzhen University, Shenzhen 518060, China
| | - Xin Liu
- Department of Ocean Science and Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
| | - Chun Po Fung
- Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong 999077, China
| | - Naining Xu
- Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Department of Oral and Maxillofacial Surgery, Stomatological Center, Peking University Shenzhen Hospital, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen 518036, China
| | - Monica Ching Suen
- Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong 999077, China
| | - Wei Ye
- Department of Ocean Science and Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
| | - Herman Ho Yung Sung
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong 999077, China
| | - Ian Duncan Williams
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong 999077, China
| | - Guang Zhu
- Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Shenzhen Research Institute, The Hong Kong University of Science and Technology, Hi-Tech Park, Nanshan, Shenzhen 518057, China
| | - Pei-Yuan Qian
- Department of Ocean Science and Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong 999077, China
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
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3
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Wang E, Thombre R, Shah Y, Latanich R, Wang J. G-Quadruplexes as pathogenic drivers in neurodegenerative disorders. Nucleic Acids Res 2021; 49:4816-4830. [PMID: 33784396 PMCID: PMC8136783 DOI: 10.1093/nar/gkab164] [Citation(s) in RCA: 65] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Revised: 02/20/2021] [Accepted: 03/29/2021] [Indexed: 12/12/2022] Open
Abstract
G-quadruplexes (G4s), higher-order DNA and RNA secondary structures featuring guanine-rich nucleic acid sequences with various conformations, are widely distributed in the human genome. These structural motifs are known to participate in basic cellular processes, including transcription, splicing, and translation, and their functions related to health and disease are becoming increasingly recognized. In this review, we summarize the landscape of G4s involved in major neurodegenerative disorders, describing the genes that contain G4-forming sequences and proteins that have high affinity for G4-containing elements. The functions of G4s are diverse, with potentially protective or deleterious effects in the pathogenic cascades of various neurological diseases. While the studies of the functions of G4s in vivo, including those involved in pathophysiology, are still in their early stages, we will nevertheless discuss the evidence pointing to their biological relevance. A better understanding of this unique structural element in the biological context is important for unveiling its potential roles in the pathogenesis of diseases such as neurodegeneration and for designing new diagnostic and therapeutic strategies.
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Affiliation(s)
- Ernest Wang
- Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore MD, 21205, USA.,Department of Neuroscience, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Ravi Thombre
- Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore MD, 21205, USA.,Department of Neuroscience, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Yajas Shah
- Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore MD, 21205, USA.,Department of Neuroscience, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Rachel Latanich
- Department of Medicine, Division of Gastroenterology and Hepatology, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Jiou Wang
- Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore MD, 21205, USA.,Department of Neuroscience, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA
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4
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Supramolecular Polymorphism of (G 4C 2) n Repeats Associated with ALS and FTD. Int J Mol Sci 2021; 22:ijms22094532. [PMID: 33926081 PMCID: PMC8123662 DOI: 10.3390/ijms22094532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 04/21/2021] [Accepted: 04/23/2021] [Indexed: 12/25/2022] Open
Abstract
Guanine-rich DNA sequences self-assemble into highly stable fourfold structures known as DNA-quadruplexes (or G-quadruplexes). G-quadruplexes have furthermore the tendency to associate into one-dimensional supramolecular aggregates termed G-wires. We studied the formation of G-wires in solutions of the sequences d(G4C2)n with n = 1, 2, and 4. The d(G4C2)n repeats, which are associated with some fatal neurological disorders, especially amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD), represent a challenging research topic due to their extensive structural polymorphism. We used dynamic light scattering (DLS) to measure translational diffusion coefficients and consequently resolve the length of the larger aggregates formed in solution. We found that all three sequences assemble into longer structures than previously reported. The d(G4C2) formed extremely long G-wires with lengths beyond 80 nm. The d(G4C2)2 formed a relatively short stacked dimeric quadruplex, while d(G4C2)4 formed multimers corresponding to seven stacked intramolecular quadruplexes. Profound differences between the multimerization properties of the investigated sequences were also confirmed by the AFM imaging of surface films. We propose that π-π stacking of the basic G-quadruplex units plays a vital role in the multimerization mechanism, which might be relevant for transformation from the regular medium-length to disease-related long d(G4C2)n repeats.
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Fluorene/fluorenone carboxamide derivatives as selective light-up fluorophores for c-myc G-quadruplex. Bioorg Med Chem Lett 2021; 36:127824. [PMID: 33513388 DOI: 10.1016/j.bmcl.2021.127824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 01/01/2021] [Accepted: 01/19/2021] [Indexed: 12/11/2022]
Abstract
The development of fluorescent dyes capable of selective recognition of G-quadruplexes is essential for studying its localization and biological functions. However, considering the G-quadruplex topologies may vary significantly, the synthesis of compounds showing both selectivity and strong fluorescence properties still remains a great challenge. Recently we have developed fluorene/fluorenone derivatives with structure-specific binding towards dsRNA, indicating its potential for structure-selective ligands. Herein, we report the synthesis of novel fluorene/fluorenone derivatives and their selectivity towards various DNA structures, particularly G-quadruplexes, two of which showed strong affinity to the proto-oncogene c-myc promoter G-quadruplex.
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6
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Thermal Stability Changes in Telomeric G-Quadruplex Structures Due to N6-Methyladenine Modification. EPIGENOMES 2021; 5:epigenomes5010005. [PMID: 34968256 PMCID: PMC8594671 DOI: 10.3390/epigenomes5010005] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 01/26/2021] [Accepted: 01/27/2021] [Indexed: 11/17/2022] Open
Abstract
N6-methyladenine modification (m6dA) has recently been identified in eukaryote genomic DNA. The methylation destabilizes the duplex structure when the adenine forms a Watson-Crick base pair, whereas the methylation on a terminal unpaired adenine stabilizes the duplex structure by increasing the stacking interaction. In this study, the effects of m6dA modification on the thermal stability of four distinct telomeric G-quadruplex (G4) structures were investigated. The m6dA-modified telomeric oligonucleotide d[AGGG(TTAGGG)3] that forms a basket-type G4 in Na+, d[(TTAGGG)4TT] that forms a hybrid-type G4 in K+ (Form-2), d[AAAGGG(TTAGGG)3AA] that forms a hybrid-type G4 in K+ (Form-1), and d[GGG(TTAGGG)3T] that forms a basket-type G4 with two G-tetrads in K+ (Form-3) were analyzed. Circular dichroism melting analysis demonstrated that (1) A7- and A19-methylation destabilized the basket-type G4 structure that formed in Na+, whereas A13-methylation stabilized the structure; (2) A15-methylation stabilized the Form-2 G4 structure; (3) A15- and A21-methylations stabilized the Form-1 G4 structure; and (4) A12-methylation stabilized the Form-3 G4 structure. These results suggest that m6dA modifications may affect the thermal stability of human telomeric G4 structures in regulating the biological functions.
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7
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Köhler T, Patsis PA, Hahn D, Ruland A, Naas C, Müller M, Thiele J. DNAzymes as Catalysts for l-Tyrosine and Amyloid β Oxidation. ACS OMEGA 2020; 5:7059-7064. [PMID: 32280846 PMCID: PMC7143405 DOI: 10.1021/acsomega.9b02645] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 03/05/2020] [Indexed: 05/03/2023]
Abstract
Single-stranded deoxyribonucleic acids have an enormous potential for catalysis by applying tailored sequences of nucleotides for individual reaction conditions and substrates. If such a sequence is guanine-rich, it may arrange into a three-dimensional structure called G-quadruplex and give rise to a catalytically active DNA molecule, a DNAzyme, upon addition of hemin. Here, we present a DNAzyme-mediated reaction, which is the oxidation of l-tyrosine toward dityrosine by hydrogen peroxide. With an optimal stoichiometry between DNA and hemin of 1:10, we report an activity of 101.2 ± 3.5 μUnits (μU) of the artificial DNAzyme Dz-00 compared to 33.0 ± 1.8 μU of free hemin. Exemplarily, DNAzymes may take part in neurodegeneration caused by amyloid beta (Aβ) aggregation due to l-tyrosine oxidation. We show that the natural, human genome-derived DNAzyme In1-sp is able to oxidize Aβ peptides with a 4.6% higher yield and a 33.3% higher velocity of the reaction compared to free hemin. As the artificial DNAzyme Dz-00 is even able to catalyze Aβ peptide oxidation with a 64.2% higher yield and 337.1% higher velocity, an in-depth screening of human genome-derived DNAzymes may identify further candidates with similarly high catalytic activity in Aβ peptide oxidation.
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Affiliation(s)
- Tony Köhler
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Panagiotis A. Patsis
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- European
Molecular Biology Laboratory, Meyerhofstraße 1, 69117 Heidelberg, Germany
| | - Dominik Hahn
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- Center
for Regenerative Therapies Dresden (CRTD), Fetscherstraße 105, 01307 Dresden, Germany
| | - André Ruland
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Carolin Naas
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Martin Müller
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Julian Thiele
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- E-mail:
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8
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Trageser KJ, Smith C, Herman FJ, Ono K, Pasinetti GM. Mechanisms of Immune Activation by c9orf72-Expansions in Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Front Neurosci 2019; 13:1298. [PMID: 31920478 PMCID: PMC6914852 DOI: 10.3389/fnins.2019.01298] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 11/20/2019] [Indexed: 12/11/2022] Open
Abstract
Amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) are neurodegenerative disorders with overlapping pathomechanisms, neurobehavioral features, and genetic etiologies. Individuals diagnosed with either disorder exhibit symptoms within a clinical spectrum. Symptoms of ALS involve neuromusculature deficits, reflecting upper and lower motor neurodegeneration, while the primary clinical features of FTD are behavioral and cognitive impairments, reflecting frontotemporal lobar degeneration. An intronic G4C2 hexanucleotide repeat expansion (HRE) within the promoter region of chromosome 9 open reading frame 72 (C9orf72) is the predominant monogenic cause of both ALS and FTD. While the heightened risk to develop ALS/FTD in response to C9orf72 expansions is well-established, studies continue to define the precise mechanisms by which this mutation elicits neurodegeneration. Studies show that G4C2 expansions undergo repeat-associated non-ATG dependent (RAN) translation, producing dipeptide repeat proteins (DRPs) with varying toxicities. Accumulation of DRPs in neurons, in particular arginine containing DRPs, have neurotoxic effects by potently impairing nucleocytoplasmic transport, nucleotide metabolism, lysosomal processes, and cellular metabolic pathways. How these pathophysiological effects of C9orf72 expansions engage and elicit immune activity with additional neurobiological consequences is an important line of future investigations. Immunoreactive microglia and elevated levels of peripheral inflammatory cytokines noted in individuals with C9orf72 ALS/FTD provide evidence that persistent immune activation has a causative role in the progression of each disorder. This review highlights the current understanding of the cellular, proteomic and genetic substrates through which G4C2 HREs may elicit detrimental immune activity, facilitating region-specific neurodegeneration in C9orf72 mediated ALS/FTD. We in particular emphasize interactions between intracellular pathways induced by C9orf72 expansions and innate immune inflammasome complexes, intracellular receptors responsible for eliciting inflammation in response to cellular stress. A further understanding of the intricate, reciprocal relationship between the cellular and molecular pathologies resulting from C9orf72 HREs and immune activation may yield novel therapeutics for ALS/FTD, which currently have limited treatment strategies.
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Affiliation(s)
- Kyle J Trageser
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Chad Smith
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Francis J Herman
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Kenjiro Ono
- Division of Neurology, Department of Medicine, Showa University School of Medicine, Tokyo, Japan
| | - Giulio Maria Pasinetti
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, United States.,Geriatrics Research, Education and Clinical Center, JJ Peters VA Medical Center, Bronx, NY, United States
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Battle AR, Norton RS, Böcking T, Noji H, Kim KK, Nagayama K. Editorial: Special issue of Biophysical Reviews dedicated to the joint 10th Asian Biophysics Association Symposium and 42nd Australian Society for Biophysics Meeting, Melbourne, Australia, December 2-6, 2018. Biophys Rev 2019; 11:245-247. [PMID: 31115863 PMCID: PMC6557946 DOI: 10.1007/s12551-019-00553-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 05/07/2019] [Indexed: 12/15/2022] Open
Affiliation(s)
- Andrew R Battle
- School of Biomedical Sciences, Queensland University of Technology, Brisbane, 4000, Australia.
- Translational Research Institute and Institute for Biomedical Innovation (QUT), 37 Kent Street, Woolloongabba, 4102, Australia.
- The University of Queensland Diamantina Institute, Faculty of Medicine, The University of Queensland, Brisbane, 4102, Australia.
| | - Raymond S Norton
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 381 Royal Parade, Parkville, VIC, 3052, Australia
| | - Till Böcking
- EMBL Australia Node in Single Molecule Science, School of Medical Sciences, UNSW Sydney, Sydney, NSW, Australia
| | - Hiroyuki Noji
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Tokyo, 113-8656, Japan
| | - Kyeong Kyu Kim
- Department of Molecular Cell Biology, School of Medicine, Sungkyunkwan University, Suwon, 16419, South Korea
| | - Kuniaki Nagayama
- National Institute for Physiological Sciences, Myodaiji-cho, Okazaki, 444-8585, Japan
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