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Major T, Tiet MY, Horvath R, Hensiek AE. Correlation Between the SARA and A-T NEST Clinical Severity Scores in Adults with Ataxia-Telangiectasia. Cerebellum 2024; 23:455-458. [PMID: 37036622 PMCID: PMC10951025 DOI: 10.1007/s12311-023-01528-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/04/2023] [Indexed: 04/11/2023]
Abstract
Ataxia-Telangiectasia (A-T) is an autosomal recessive neurodegenerative disease associated with cerebellar ataxia and extrapyramidal features. A-T has a complex and diverse phenotype with varying rates of disease progression. The development of robust natural history studies and therapeutic trials relies on the accurate recording of phenotype using relevant and validated severity of illness indexes. We compared the commonly used Scale for the Assessment and Rating of Ataxia (SARA) and the disease-specific A-T Neurological Examination Scale Toolkit (A-T NEST), in our adult A-T cohort. We found a strong correlation between A-T NEST and the established SARA score, validating the use of A-T NEST and SARA in capturing the natural history of A-T patients.
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Affiliation(s)
- Toby Major
- School of Clinical Medicine, University of Cambridge, Hills Road, Cambridge, CB2 0SP, UK
| | - May Yung Tiet
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, CB2 2QQ, UK
| | - Rita Horvath
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, CB2 2QQ, UK
| | - Anke E Hensiek
- Department of Neurology, Cambridge University Hospitals NHS Foundation Trust, Cambridge, CB2 0QQ, UK.
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2
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Deacon S, Dalleywater W, Peat C, Paine SML, Dineen RA. Disproportionate Expression of ATM in Cerebellar Cortex During Human Neurodevelopment. Cerebellum 2024; 23:502-511. [PMID: 37120494 PMCID: PMC10951037 DOI: 10.1007/s12311-023-01560-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/20/2023] [Indexed: 05/01/2023]
Abstract
Cerebellar neurodegeneration is a classical feature of ataxia telangiectasia (A-T), an autosomal recessive condition caused by loss-of-function mutation of the ATM gene, a gene with multiple regulatory functions. The increased vulnerability of cerebellar neurones to degeneration compared to cerebral neuronal populations in individuals with ataxia telangiectasia implies a specific importance of intact ATM function in the cerebellum. We hypothesised that there would be elevated transcription of ATM in the cerebellar cortex relative to ATM expression in other grey matter regions during neurodevelopment in individuals without A-T. Using ATM transcription data from the BrainSpan Atlas of the Developing Human Brain, we demonstrate a rapid increase in cerebellar ATM expression relative to expression in other brain regions during gestation and remaining elevated during early childhood, a period corresponding to the emergence of cerebellar neurodegeneration in ataxia telangiectasia patients. We then used gene ontology analysis to identify the biological processes represented in the genes correlated with cerebellar ATM expression. This analysis demonstrated that multiple processes are associated with expression of ATM in the cerebellum, including cellular respiration, mitochondrial function, histone methylation, and cell-cycle regulation, alongside its canonical role in DNA double-strand break repair. Thus, the enhanced expression of ATM in the cerebellum during early development may be related to the specific energetic demands of the cerebellum and its role as a regulator of these processes.
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Affiliation(s)
- Simon Deacon
- Department of Cellular Pathology, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - William Dalleywater
- Department of Cellular Pathology, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Charles Peat
- Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Simon M L Paine
- Department of Neuropathology, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Rob A Dineen
- Mental Health and Clinical Neuroscience, School of Medicine, University of Nottingham, Nottingham, UK.
- NIHR Nottingham Biomedical Research Centre, Nottingham, UK.
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3
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Wang MJ, Xia Y, Gao QL. DNA Damage-driven Inflammatory Cytokines: Reprogramming of Tumor Immune Microenvironment and Application of Oncotherapy. Curr Med Sci 2024; 44:261-272. [PMID: 38561595 DOI: 10.1007/s11596-024-2859-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 02/29/2024] [Indexed: 04/04/2024]
Abstract
DNA damage occurs across tumorigenesis and tumor development. Tumor intrinsic DNA damage can not only increase the risk of mutations responsible for tumor generation but also initiate a cellular stress response to orchestrate the tumor immune microenvironment (TIME) and dominate tumor progression. Accumulating evidence documents that multiple signaling pathways, including cyclic GMP-AMP synthase-stimulator of interferon genes (cGAS-STING) and ataxia telangiectasia-mutated protein/ataxia telangiectasia and Rad3-related protein (ATM/ATR), are activated downstream of DNA damage and they are associated with the secretion of diverse cytokines. These cytokines possess multifaced functions in the anti-tumor immune response. Thus, it is necessary to deeply interpret the complex TIME reshaped by damaged DNA and tumor-derived cytokines, critical for the development of effective tumor therapies. This manuscript comprehensively reviews the relationship between the DNA damage response and related cytokines in tumors and depicts the dual immunoregulatory roles of these cytokines. We also summarize clinical trials targeting signaling pathways and cytokines associated with DNA damage and provide future perspectives on emerging technologies.
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Affiliation(s)
- Meng-Jie Wang
- Department of Obstetrics and Gynecology, National Clinical Research Center for Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
- Key Laboratory of Cancer Invasion and Metastasis (Ministry of Education), Hubei Key Laboratory of Tumor Invasion and Metastasis, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Yu Xia
- Department of Obstetrics and Gynecology, National Clinical Research Center for Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
- Key Laboratory of Cancer Invasion and Metastasis (Ministry of Education), Hubei Key Laboratory of Tumor Invasion and Metastasis, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Qing-Lei Gao
- Department of Obstetrics and Gynecology, National Clinical Research Center for Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
- Key Laboratory of Cancer Invasion and Metastasis (Ministry of Education), Hubei Key Laboratory of Tumor Invasion and Metastasis, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
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4
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Woolley PR, Wen X, Conway OM, Ender NA, Lee JH, Paull TT. Regulation of transcription patterns, poly(ADP-ribose), and RNA-DNA hybrids by the ATM protein kinase. Cell Rep 2024; 43:113896. [PMID: 38442018 PMCID: PMC11022685 DOI: 10.1016/j.celrep.2024.113896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 01/11/2024] [Accepted: 02/15/2024] [Indexed: 03/07/2024] Open
Abstract
The ataxia telangiectasia mutated (ATM) protein kinase is a master regulator of the DNA damage response and also an important sensor of oxidative stress. Analysis of gene expression in ataxia-telangiectasia (A-T) patient brain tissue shows that large-scale transcriptional changes occur in patient cerebellum that correlate with the expression level and guanine-cytosine (GC) content of transcribed genes. In human neuron-like cells in culture, we map locations of poly(ADP-ribose) and RNA-DNA hybrid accumulation genome-wide with ATM inhibition and find that these marks also coincide with high transcription levels, active transcription histone marks, and high GC content. Antioxidant treatment reverses the accumulation of R-loops in transcribed regions, consistent with the central role of reactive oxygen species in promoting these lesions. Based on these results, we postulate that transcription-associated lesions accumulate in ATM-deficient cells and that the single-strand breaks and PARylation at these sites ultimately generate changes in transcription that compromise cerebellum function and lead to neurodegeneration over time in A-T patients.
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Affiliation(s)
- Phillip R Woolley
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712, USA
| | - Xuemei Wen
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712, USA
| | - Olivia M Conway
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712, USA
| | - Nicolette A Ender
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712, USA
| | - Ji-Hoon Lee
- Department of Biological Sciences, Research Center of Ecomimetics, Chonnam National University, Gwangju 61186, Republic of Korea.
| | - Tanya T Paull
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712, USA.
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Sokay A, Leahy TR, O'Regan M, O' Grady M. Variant ataxia telangiectasia identified during evaluation for short stature. BMJ Case Rep 2024; 17:e257736. [PMID: 38453233 PMCID: PMC10921506 DOI: 10.1136/bcr-2023-257736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2024] Open
Abstract
Ataxia telangiectasia (A-T) (OMIM 208900) is an autosomal recessive multisystem disorder characterised by progressive cerebellar ataxia, telangiectasias, immunodeficiency and a predisposition to malignancy. 'Variant' A-T has later onset of neurological symptoms and slower progression compared with the 'classic' form. A woman presented with short stature in late childhood. Karyotype revealed rearrangements involving chromosomes 7 and 14. A chromosomal breakage disorder gene panel demonstrated compound heterozygote mutations in her ATM gene including one mutation c.7271T>G with residual ATM function, confirming the diagnosis of variant A-T. Since diagnosis, she has developed progressive cerebellar ataxia and telangiectasias. Long-standing restrictive and aversive feeding behaviours presented challenges for her management and necessitated gastrostomy.
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Affiliation(s)
- Anitha Sokay
- Paediatrics, Midland Regional Hospital Mullingar, Mullingar, Ireland
| | | | - Mary O'Regan
- Neurology, Our Lady's Hospital Crumlin, Crumlin, Ireland
| | - Michael O' Grady
- Paediatrics, Midland Regional Hospital Mullingar, Mullingar, Ireland
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Paull TT, Woolley PR. A-T neurodegeneration and DNA damage-induced transcriptional stress. DNA Repair (Amst) 2024; 135:103647. [PMID: 38377644 DOI: 10.1016/j.dnarep.2024.103647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 02/08/2024] [Indexed: 02/22/2024]
Abstract
Loss of the ATM protein kinase in humans results in Ataxia-telangiectasia, a disorder characterized by childhood-onset neurodegeneration of the cerebellum as well as cancer predisposition and immunodeficiency. Although many aspects of ATM function are well-understood, the mechanistic basis of the progressive cerebellar ataxia that occurs in patients is not. Here we review recent progress related to the role of ATM in neurons and the cerebellum that comes from many sources: animal models, post-mortem brain tissue samples, and human neurons in culture. These observations have revealed new insights into the consequences of ATM loss on DNA damage, gene expression, and immune signaling in the brain. Many results point to the importance of reactive oxygen species as well as single-strand DNA breaks in the progression of molecular events leading to neuronal dysfunction. In addition, innate immunity signaling pathways appear to play a critical role in ATM functions in microglia, responding to various forms of nucleic acid sensors and regulating survival of neurons and other cell types. Overall, the results lead to an updated view of transcriptional stress and DNA damage resulting from ATM loss that results in changes in gene expression as well as neuroinflammation that contribute to the cerebellar neurodegeneration observed in patients.
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Affiliation(s)
- Tanya T Paull
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA.
| | - Phillip R Woolley
- The University of Texas at Austin, Department of Molecular Biosciences, Austin, TX 78712, USA
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Michki NS, Singer BD, Perez JV, Thomas AJ, Natale V, Helmin KA, Wright J, Cheng L, Young LR, Lederman HM, McGrath-Morrow SA. Transcriptional profiling of peripheral blood mononuclear cells identifies inflammatory phenotypes in Ataxia Telangiectasia. Orphanet J Rare Dis 2024; 19:67. [PMID: 38360726 PMCID: PMC10870445 DOI: 10.1186/s13023-024-03073-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 02/03/2024] [Indexed: 02/17/2024] Open
Abstract
INTRODUCTION Ataxia telangiectasia (A-T) is an autosomal recessive neurodegenerative disease with widespread systemic manifestations and marked variability in clinical phenotypes. In this study, we sought to determine whether transcriptomic profiling of peripheral blood mononuclear cells (PBMCs) defines subsets of individuals with A-T beyond mild and classic phenotypes, enabling identification of novel features for disease classification and treatment response to therapy. METHODS Participants with classic A-T (n = 77), mild A-T (n = 13), and unaffected controls (n = 15) were recruited from two outpatient clinics. PBMCs were isolated and bulk RNAseq was performed. Plasma was also isolated in a subset of individuals. Affected individuals were designated mild or classic based on ATM mutations and clinical and laboratory features. RESULTS People with classic A-T were more likely to be younger and IgA deficient and to have higher alpha-fetoprotein levels and lower % forced vital capacity compared to individuals with mild A-T. In classic A-T, the expression of genes required for V(D)J recombination was lower, and the expression of genes required for inflammatory activity was higher. We assigned inflammatory scores to study participants and found that inflammatory scores were highly variable among people with classic A-T and that higher scores were associated with lower ATM mRNA levels. Using a cell type deconvolution approach, we inferred that CD4 + T cells and CD8 + T cells were lower in number in people with classic A-T. Finally, we showed that individuals with classic A-T exhibit higher SERPINE1 (PAI-1) mRNA and plasma protein levels, irrespective of age, and higher FLT4 (VEGFR3) and IL6ST (GP130) plasma protein levels compared with mild A-T and controls. CONCLUSION Using a transcriptomic approach, we identified novel features and developed an inflammatory score to identify subsets of individuals with different inflammatory phenotypes in A-T. Findings from this study could be used to help direct treatment and to track treatment response to therapy.
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Affiliation(s)
- Nigel S Michki
- Division of Pulmonary and Sleep Medicine, Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA, USA
| | - Benjamin D Singer
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA
| | - Javier V Perez
- Division of Pulmonary and Sleep Medicine, Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA, USA
| | - Aaron J Thomas
- Division of Pulmonary and Sleep Medicine, Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA, USA
| | - Valerie Natale
- Forgotten Diseases Research Foundation, Santa Clara, CA, USA
| | - Kathryn A Helmin
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA
| | - Jennifer Wright
- Department of Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, 21287, USA
| | - Leon Cheng
- Department of Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, 21287, USA
| | - Lisa R Young
- Division of Pulmonary and Sleep Medicine, Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA, USA
| | - Howard M Lederman
- Department of Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, 21287, USA
| | - Sharon A McGrath-Morrow
- Division of Pulmonary and Sleep Medicine, Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA, USA.
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8
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Garg M, Li L, Godbout R. Role of DDX1 in the oxidative response of ataxia telangiectasia patient-derived fibroblasts. Redox Biol 2024; 69:102988. [PMID: 38096740 PMCID: PMC10761787 DOI: 10.1016/j.redox.2023.102988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/25/2023] [Accepted: 12/04/2023] [Indexed: 01/06/2024] Open
Abstract
Ataxia Telangiectasia (A-T) is an inherited autosomal recessive disorder characterized by cerebellar neurodegeneration, radiosensitivity, immunodeficiency and a high incidence of lymphomas. A-T is caused by mutations in the ATM gene. While loss of ATM function in DNA repair explains some aspects of A-T pathophysiology such as radiosensitivity and cancer predisposition, other A-T features such as neurodegeneration imply additional roles for ATM outside the nucleus. Emerging evidence suggests that ATM participates in cellular response to oxidative stress, failure of which contributes to the neurodegeneration associated with A-T. Here, we use fibroblasts derived from A-T patients to investigate whether DEAD Box 1 (DDX1), an RNA binding/unwinding protein that functions downstream of ATM in DNA double strand break repair, also plays a role in ATM-dependent cellular response to oxidative stress. Focusing on DDX1 target RNAs that are associated with neurological disorders and oxidative stress response, we show that ATM is required for increased binding of DDX1 to its target RNAs in the presence of arsenite-induced oxidative stress. Our results indicate that DDX1 functions downstream of ATM by protecting specific mRNAs in the cytoplasm of arsenite-treated cells. In keeping with a role for ATM and DDX1 in oxidative stress, levels of reactive oxygen species (ROS) are increased in ATM-deficient as well as DDX1-depleted cells. We propose that reduced levels of cytoplasmic DDX1 RNA targets sensitizes ATM-deficient cells to oxidative stress resulting in increased cell death. This sensitization would be especially detrimental to long-lived highly metabolically active cells such as neurons providing a possible explanation for the neurodegenerative defects associated with A-T.
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Affiliation(s)
- Mansi Garg
- Department of Oncology, Cross Cancer Institute, University of Alberta, 11560 University Avenue, Edmonton, Alberta, T6G 1Z2, Canada
| | - Lei Li
- Department of Oncology, Cross Cancer Institute, University of Alberta, 11560 University Avenue, Edmonton, Alberta, T6G 1Z2, Canada
| | - Roseline Godbout
- Department of Oncology, Cross Cancer Institute, University of Alberta, 11560 University Avenue, Edmonton, Alberta, T6G 1Z2, Canada.
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Atkinson C, McInerney-Leo AM, Proctor M, Lanagan C, Stevenson AJ, Dehkhoda F, Caole M, Maas E, Ainger S, Pritchard AL, Johansson PA, Leo P, Hayward NK, Sturm RA, Duncan EL, Gabrielli B. The ATM Ser49Cys Variant Effects ATM Function as a Regulator of Oncogene-Induced Senescence. Int J Mol Sci 2024; 25:1664. [PMID: 38338943 PMCID: PMC10855307 DOI: 10.3390/ijms25031664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/15/2024] [Accepted: 01/21/2024] [Indexed: 02/12/2024] Open
Abstract
An apical component of the cell cycle checkpoint and DNA damage repair response is the ataxia-telangiectasia mutated (ATM) Ser/Thr protein kinase. A variant of ATM, Ser49Cys (rs1800054; minor allele frequency = 0.011), has been associated with an elevated risk of melanoma development; however, the functional consequence of this variant is not defined. ATM-dependent signalling in response to DNA damage has been assessed in a panel of patient-derived lymphoblastoid lines and primary human melanocytic cell strains heterozygous for the ATM Ser49Cys variant allele. The ATM Ser49Cys allele appears functional for acute p53-dependent signalling in response to DNA damage. Expression of the variant allele did reduce the efficacy of oncogene expression in inducing senescence. These findings demonstrate that the ATM 146C>G Ser49Cys allele has little discernible effect on the acute response to DNA damage but has reduced function observed in the chronic response to oncogene over-expression. Analysis of melanoma, naevus and skin colour genomics and GWAS analyses have demonstrated no association of this variant with any of these outcomes. The modest loss of function detected suggest that the variant may act as a modifier of other variants of ATM/p53-dependent signalling.
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Affiliation(s)
- Caroline Atkinson
- Mater Research Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | - Aideen M. McInerney-Leo
- Dermatology Research Centre, Frazer Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | - Martina Proctor
- Mater Research Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | - Catherine Lanagan
- Mater Research Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | | | - Farhad Dehkhoda
- Dermatology Research Centre, Frazer Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | - Mary Caole
- Mater Research Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | - Ellie Maas
- Dermatology Research Centre, Frazer Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | - Stephen Ainger
- Dermatology Research Centre, Frazer Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | - Antonia L. Pritchard
- Queensland Institute for Medical Research Berghofer, Brisbane, QLD 4006, Australia
| | - Peter A. Johansson
- Queensland Institute for Medical Research Berghofer, Brisbane, QLD 4006, Australia
| | - Paul Leo
- Centre of Genomics and Personalised Health, Queensland University of Technology, Brisbane, QLD 4059, Australia
| | - Nicholas K. Hayward
- Queensland Institute for Medical Research Berghofer, Brisbane, QLD 4006, Australia
| | - Richard A. Sturm
- Dermatology Research Centre, Frazer Institute, The University of Queensland, Brisbane, QLD 4102, Australia
| | - Emma L. Duncan
- Department of Twin Research and Genetic Epidemiology, School of Life Course & Population Sciences, Faculty of Life Sciences and Medicine, King’s College London, London SE1 1UL, UK
| | - Brian Gabrielli
- Mater Research Institute, The University of Queensland, Brisbane, QLD 4102, Australia
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Lai J, Demirbas D, Kim J, Jeffries AM, Tolles A, Park J, Chittenden TW, Buckley PG, Yu TW, Lodato MA, Lee EA. ATM-deficiency-induced microglial activation promotes neurodegeneration in ataxia-telangiectasia. Cell Rep 2024; 43:113622. [PMID: 38159274 PMCID: PMC10908398 DOI: 10.1016/j.celrep.2023.113622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/26/2023] [Accepted: 12/08/2023] [Indexed: 01/03/2024] Open
Abstract
While ATM loss of function has long been identified as the genetic cause of ataxia-telangiectasia (A-T), how it leads to selective and progressive degeneration of cerebellar Purkinje and granule neurons remains unclear. ATM expression is enriched in microglia throughout cerebellar development and adulthood. Here, we find evidence of microglial inflammation in the cerebellum of patients with A-T using single-nucleus RNA sequencing. Pseudotime analysis revealed that activation of A-T microglia preceded upregulation of apoptosis-related genes in granule and Purkinje neurons and that microglia exhibited increased neurotoxic cytokine signaling to granule and Purkinje neurons in A-T. To confirm these findings experimentally, we performed transcriptomic profiling of A-T induced pluripotent stem cell (iPSC)-derived microglia, which revealed cell-intrinsic microglial activation of cytokine production and innate immune response pathways compared to controls. Furthermore, A-T microglia co-culture with either control or A-T iPSC-derived neurons was sufficient to induce cytotoxicity. Taken together, these studies reveal that cell-intrinsic microglial activation may promote neurodegeneration in A-T.
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Affiliation(s)
- Jenny Lai
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Program in Neuroscience, Harvard University, Boston, MA 02115, USA
| | - Didem Demirbas
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Junho Kim
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Ailsa M Jeffries
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Allie Tolles
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Junseok Park
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Thomas W Chittenden
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; Computational Statistics and Bioinformatics Group, Genuity AI Research Institute, Genuity Science, Boston, MA 02114, USA
| | | | - Timothy W Yu
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Michael A Lodato
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
| | - Eunjung Alice Lee
- Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
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11
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Nurieva W, Ivanova E, Chehab S, Singh P, Reichlmeir M, Szuhai K, Auburger GWJ, Skarnes WC, Ivics Z. Generation of four gene-edited human induced pluripotent stem cell lines with mutations in the ATM gene to model Ataxia-Telangiectasia. Stem Cell Res 2023; 73:103247. [PMID: 37976651 DOI: 10.1016/j.scr.2023.103247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 11/02/2023] [Accepted: 11/04/2023] [Indexed: 11/19/2023] Open
Abstract
Ataxia-Telangiectasia (A-T) is an autosomal recessive multi-system disorder caused by mutations in the ataxia-telangiectasia mutated (ATM) gene, resulting, among other symptoms, in neurological dysfunction. ATM is known to be a master controller of signal transduction for DNA damage response, with additional functions that are poorly understood. CRISPR/Cas9 technology was used to introduce biallelic mutations at selected sites of the ATM gene in human induced pluripotent stem cells (hiPSCs). This panel of hiPSCs with nonsense and missense mutations in ATM can help understand the molecular basis of A-T.
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Affiliation(s)
- Wasifa Nurieva
- Division of Hematology, Gene and Cell Therapy, Paul-Ehrlich-Institut, Langen, Germany.
| | - Elena Ivanova
- Division of Hematology, Gene and Cell Therapy, Paul-Ehrlich-Institut, Langen, Germany
| | - Sanabel Chehab
- Division of Hematology, Gene and Cell Therapy, Paul-Ehrlich-Institut, Langen, Germany
| | - Parth Singh
- Division of Hematology, Gene and Cell Therapy, Paul-Ehrlich-Institut, Langen, Germany
| | - Marina Reichlmeir
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Experimental Neurology, Frankfurt am Main, Germany
| | - Karoly Szuhai
- Department of Cell and Chemical Biology, Leiden University Medical Center, Netherlands
| | - Georg W J Auburger
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Experimental Neurology, Frankfurt am Main, Germany
| | | | - Zoltán Ivics
- Division of Hematology, Gene and Cell Therapy, Paul-Ehrlich-Institut, Langen, Germany.
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12
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Hirch T, Brander N, Schenk F, Pöllmann SJ, Reichenbach J, Schubert R, Modlich U. Expression of a large coding sequence: Gene therapy vectors for Ataxia Telangiectasia. Sci Rep 2023; 13:19386. [PMID: 37938627 PMCID: PMC10632516 DOI: 10.1038/s41598-023-46332-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 10/31/2023] [Indexed: 11/09/2023] Open
Abstract
Ataxia telangiectasia is a monogenetic disorder caused by mutations in the ATM gene. Its encoded protein kinase ATM plays a fundamental role in DNA repair of double strand breaks (DSBs). Impaired function of this kinase leads to a multisystemic disorder including immunodeficiency, progressive cerebellar degeneration, radiation sensitivity, dilated blood vessels, premature aging and a predisposition to cancer. Since allogenic hematopoietic stem cell (HSC) transplantation improved disease outcome, gene therapy based on autologous HSCs is an alternative promising concept. However, due to the large cDNA of ATM (9.2 kb), efficient packaging of retroviral particles and sufficient transduction of HSCs remains challenging.We generated lentiviral, gammaretroviral and foamy viral vectors with a GFP.F2A.Atm fusion or a GFP transgene and systematically compared transduction efficiencies. Vector titers dropped with increasing transgene size, but despite their described limited packaging capacity, we were able to produce lentiviral and gammaretroviral particles. The reduction in titers could not be explained by impaired packaging of the viral genomes, but the main differences occurred after transduction. Finally, after transduction of Atm-deficient (ATM-KO) murine fibroblasts with the lentiviral vector expressing Atm, we could show the expression of ATM protein which phosphorylated its downstream substrates (pKap1 and p-p53).
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Affiliation(s)
- Tanja Hirch
- Division of Veterinary Medicine, RG Gene Modification in Stem Cells, Paul-Ehrlich-Institute, Langen, Germany
| | - Nadine Brander
- Division of Veterinary Medicine, RG Gene Modification in Stem Cells, Paul-Ehrlich-Institute, Langen, Germany
| | - Franziska Schenk
- Division of Veterinary Medicine, RG Gene Modification in Stem Cells, Paul-Ehrlich-Institute, Langen, Germany
| | - Simon J Pöllmann
- Division of Veterinary Medicine, RG Gene Modification in Stem Cells, Paul-Ehrlich-Institute, Langen, Germany
- Department of Gene and Cell Therapy, Institute for Regenerative Medicine - IREM, University of Zurich, Schlieren, Switzerland
| | - Janine Reichenbach
- Department of Gene and Cell Therapy, Institute for Regenerative Medicine - IREM, University of Zurich, Schlieren, Switzerland
- Deptartment of Somatic Gene Therapy, University Children's Hospital Zurich, Zurich, Switzerland
- Competence Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zurich, Switzerland
| | - Ralf Schubert
- Department for Children and Adolescents, University Hospital Frankfurt, Goethe University, Frankfurt, Germany
| | - Ute Modlich
- Division of Veterinary Medicine, RG Gene Modification in Stem Cells, Paul-Ehrlich-Institute, Langen, Germany.
- Department of Gene and Cell Therapy, Institute for Regenerative Medicine - IREM, University of Zurich, Schlieren, Switzerland.
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13
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Zhao B, Nguyen MA, Woo S, Kim J, Yu TW, Lee EA. Contribution and therapeutic implications of retroelement insertions in ataxia telangiectasia. Am J Hum Genet 2023; 110:1976-1982. [PMID: 37802069 PMCID: PMC10645548 DOI: 10.1016/j.ajhg.2023.09.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 09/18/2023] [Accepted: 09/18/2023] [Indexed: 10/08/2023] Open
Abstract
Certain classes of genetic variation still escape detection in clinical sequencing analysis. One such class is retroelement insertion, which has been reported as a cause of Mendelian diseases and may offer unique therapeutic implications. Here, we conducted retroelement profiling on whole-genome sequencing data from a cohort of 237 individuals with ataxia telangiectasia (A-T). We found 15 individuals carrying retroelement insertions in ATM, all but one of which integrated in noncoding regions. Systematic functional characterization via RNA sequencing, RT-PCR, and/or minigene splicing assays showed that 12 out of 14 intronic insertions led or contributed to ATM loss of function by exon skipping or activating cryptic splice sites. We also present proof-of-concept antisense oligonucleotides that suppress cryptic exonization caused by a deep intronic retroelement insertion. These results provide an initial systematic estimate of the contribution of retroelements to the genetic architecture of recessive Mendelian disorders as ∼2.1%-5.5%. Our study highlights the importance of retroelement insertions as causal variants and therapeutic targets in genetic diseases.
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Affiliation(s)
- Boxun Zhao
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA; Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA, USA; Department of Pediatrics, Boston Children's Hospital, Boston, MA, USA; Broad Institute of MIT and Harvard, Cambridge, MA, USA; Harvard Medical School, Boston, MA, USA
| | - Minh A Nguyen
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Sijae Woo
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - Jinkuk Kim
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - Timothy W Yu
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA; Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA, USA; Department of Pediatrics, Boston Children's Hospital, Boston, MA, USA; Broad Institute of MIT and Harvard, Cambridge, MA, USA; Harvard Medical School, Boston, MA, USA.
| | - Eunjung Alice Lee
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA; Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA, USA; Department of Pediatrics, Boston Children's Hospital, Boston, MA, USA; Broad Institute of MIT and Harvard, Cambridge, MA, USA; Harvard Medical School, Boston, MA, USA.
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14
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Weitering TJ, Willemsen MAAP, Taylor AMR, Weemaes CMR, van der Burg M, Berghuis D. Early Diagnosis of Ataxia Telangiectasia Through Newborn Screening for SCID: a Case Report Highlighting the Dilemma of Pre-emptive HSCT. J Clin Immunol 2023; 43:1770-1773. [PMID: 37624468 DOI: 10.1007/s10875-023-01571-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 08/17/2023] [Indexed: 08/26/2023]
Affiliation(s)
- T J Weitering
- Willem-Alexander Children's Hospital, Laboratory for Pediatric Immunology, Leiden University Medical Center, Leiden, the Netherlands
| | - M A A P Willemsen
- Department of Neurology - Pediatric Neurology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - A M R Taylor
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - C M R Weemaes
- Department of Pediatrics, Radboud University Medical Center, Nijmegen, the Netherlands
| | - M van der Burg
- Willem-Alexander Children's Hospital, Laboratory for Pediatric Immunology, Leiden University Medical Center, Leiden, the Netherlands
| | - Dagmar Berghuis
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Pediatric Immunology and Stem Cell Transplantation, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, the Netherlands.
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15
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Takata M, Harada H. Meeting report: AT workshop 2023-A platform for discussing cutting-edge science in DNA damage signaling, repair, and human disorders. Genes Cells 2023; 28:642-645. [PMID: 37341149 DOI: 10.1111/gtc.13054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 06/03/2023] [Indexed: 06/22/2023]
Abstract
Ataxia-telangiectasia (A-T) is a rare devastating hereditary condition, which affects multiple organ systems including cerebellar motor function as well as DNA repair, resulting in a higher incidence of cancer and immunodeficiency. The genetic defect in A-T lies in ATM kinase, which is activated by DNA damage and regulates a plethora of substrates including the p53 tumor suppressor. We have organized an international meeting "The 19th Ataxia-Telangiectasia Workshop 2023 (ATW2023)" with support from the Molecular Biology Society of Japan (MBSJ) and other funders. Here, we report that ATW2023 was successfully held in Kyoto from March 2nd to 5th, 2023 with more than 150 participants traveling from all over the world, despite the still smoldering COVID-19 pandemic. In this meeting report, we will briefly describe the highlights of the meeting and would like to express our gratitude to the MBSJ for the financial support.
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Affiliation(s)
- Minoru Takata
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Hiroshi Harada
- Laboratory of Cancer Cell Biology, Department of Genome Dynamics, Radiation Biology Center, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
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16
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Briguglio S, Cambria C, Albizzati E, Marcello E, Provenzano G, Frasca A, Antonucci F. New Views of the DNA Repair Protein Ataxia-Telangiectasia Mutated in Central Neurons: Contribution in Synaptic Dysfunctions of Neurodevelopmental and Neurodegenerative Diseases. Cells 2023; 12:2181. [PMID: 37681912 PMCID: PMC10486624 DOI: 10.3390/cells12172181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 08/18/2023] [Accepted: 08/27/2023] [Indexed: 09/09/2023] Open
Abstract
Ataxia-Telangiectasia Mutated (ATM) is a serine/threonine protein kinase principally known to orchestrate DNA repair processes upon DNA double-strand breaks (DSBs). Mutations in the Atm gene lead to Ataxia-Telangiectasia (AT), a recessive disorder characterized by ataxic movements consequent to cerebellar atrophy or dysfunction, along with immune alterations, genomic instability, and predisposition to cancer. AT patients show variable phenotypes ranging from neurologic abnormalities and cognitive impairments to more recently described neuropsychiatric features pointing to symptoms hardly ascribable to the canonical functions of ATM in DNA damage response (DDR). Indeed, evidence suggests that cognitive abilities rely on the proper functioning of DSB machinery and specific synaptic changes in central neurons of ATM-deficient mice unveiled unexpected roles of ATM at the synapse. Thus, in the present review, upon a brief recall of DNA damage responses, we focus our attention on the role of ATM in neuronal physiology and pathology and we discuss recent findings showing structural and functional changes in hippocampal and cortical synapses of AT mouse models. Collectively, a deeper knowledge of ATM-dependent mechanisms in neurons is necessary not only for a better comprehension of AT neurological phenotypes, but also for a higher understanding of the pathological mechanisms in neurodevelopmental and degenerative disorders involving ATM dysfunctions.
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Affiliation(s)
- Sabrina Briguglio
- Department of Medical Biotechnology and Translational Medicine (BIOMETRA), University of Milan, Via F.lli Cervi 93, 20129 Segrate (MI) and via Vanvitelli 32, 20129 Milan, MI, Italy; (S.B.); (C.C.); (A.F.)
| | - Clara Cambria
- Department of Medical Biotechnology and Translational Medicine (BIOMETRA), University of Milan, Via F.lli Cervi 93, 20129 Segrate (MI) and via Vanvitelli 32, 20129 Milan, MI, Italy; (S.B.); (C.C.); (A.F.)
| | - Elena Albizzati
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA;
| | - Elena Marcello
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Via Giuseppe Balzaretti 9, 20133 Milan, MI, Italy;
| | - Giovanni Provenzano
- Department of Cellular, Computational and Integrative Biology—CIBIO, University of Trento, Via Sommarive 9, 38068 Trento, TN, Italy;
| | - Angelisa Frasca
- Department of Medical Biotechnology and Translational Medicine (BIOMETRA), University of Milan, Via F.lli Cervi 93, 20129 Segrate (MI) and via Vanvitelli 32, 20129 Milan, MI, Italy; (S.B.); (C.C.); (A.F.)
| | - Flavia Antonucci
- Department of Medical Biotechnology and Translational Medicine (BIOMETRA), University of Milan, Via F.lli Cervi 93, 20129 Segrate (MI) and via Vanvitelli 32, 20129 Milan, MI, Italy; (S.B.); (C.C.); (A.F.)
- Institute of Neuroscience, IN-CNR, Via Raoul Follereau 3, 20854 Vedano al Lambro, MB, Italy
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17
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Sun JKL, Wong GCN, Chow KHM. Cross-talk between DNA damage response and the central carbon metabolic network underlies selective vulnerability of Purkinje neurons in ataxia-telangiectasia. J Neurochem 2023; 166:654-677. [PMID: 37319113 DOI: 10.1111/jnc.15881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 05/30/2023] [Accepted: 06/01/2023] [Indexed: 06/17/2023]
Abstract
Cerebellar ataxia is often the first and irreversible outcome in the disease of ataxia-telangiectasia (A-T), as a consequence of selective cerebellar Purkinje neuronal degeneration. A-T is an autosomal recessive disorder resulting from the loss-of-function mutations of the ataxia-telangiectasia-mutated ATM gene. Over years of research, it now becomes clear that functional ATM-a serine/threonine kinase protein product of the ATM gene-plays critical roles in regulating both cellular DNA damage response and central carbon metabolic network in multiple subcellular locations. The key question arises is how cerebellar Purkinje neurons become selectively vulnerable when all other cell types in the brain are suffering from the very same defects in ATM function. This review intended to comprehensively elaborate the unexpected linkages between these two seemingly independent cellular functions and the regulatory roles of ATM involved, their integrated impacts on both physical and functional properties, hence the introduction of selective vulnerability to Purkinje neurons in the disease will be addressed.
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Affiliation(s)
- Jacquelyne Ka-Li Sun
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong
| | - Genper Chi-Ngai Wong
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong
| | - Kim Hei-Man Chow
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong
- Gerald Choa Neuroscience Institute, The Chinese University of Hong Kong, Hong Kong
- Nexus of Rare Neurodegenerative Diseases, The Chinese University of Hong Kong, Hong Kong
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18
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Haj M, Levon A, Frey Y, Hourvitz N, Campisi J, Tzfati Y, Elkon R, Ziv Y, Shiloh Y. Accelerated replicative senescence of ataxia-telangiectasia skin fibroblasts is retained at physiologic oxygen levels, with unique and common transcriptional patterns. Aging Cell 2023; 22:e13869. [PMID: 37254625 PMCID: PMC10410012 DOI: 10.1111/acel.13869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 04/23/2023] [Accepted: 04/28/2023] [Indexed: 06/01/2023] Open
Abstract
The genetic disorder, ataxia-telangiectasia (A-T), is caused by loss of the homeostatic protein kinase, ATM, and combines genome instability, tissue degeneration, cancer predisposition, and premature aging. Primary fibroblasts from A-T patients exhibit premature senescence when grown at ambient oxygen concentration (21%). Here, we show that reducing oxygen concentration to a physiological level range (3%) dramatically extends the proliferative lifespan of human A-T skin fibroblasts. However, they still undergo senescence earlier than control cells grown under the same conditions and exhibit high genome instability. Comparative RNA-seq analysis of A-T and control fibroblasts cultured at 3% oxygen followed by cluster analysis of differentially expressed genes and functional enrichment analysis, revealed distinct transcriptional dynamics in A-T fibroblasts senescing in physiological oxygen concentration. While some transcriptional patterns were similar to those observed during replicative senescence of control cells, others were unique to the senescing A-T cells. We observed in them a robust activation of interferon-stimulated genes, with undetected expression the interferon genes themselves. This finding suggests an activation of a non-canonical cGAS-STING-mediated pathway, which presumably responds to cytosolic DNA emanating from extranuclear micronuclei detected in these cells. Senescing A-T fibroblasts also exhibited a marked, intriguely complex alteration in the expression of genes associated with extracellular matrix (ECM) remodeling. Notably, many of the induced ECM genes encode senescence-associated secretory phenotype (SASP) factors known for their paracrine pro-fibrotic effects. Our data provide a molecular dimension to the segmental premature aging observed in A-T patients and its associated symptoms, which develop as the patients advance in age.
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Affiliation(s)
- Majd Haj
- Department of Human Molecular Genetics and BiochemistryTel Aviv University School of MedicineTel AvivIsrael
| | - Amit Levon
- Department of Human Molecular Genetics and BiochemistryTel Aviv University School of MedicineTel AvivIsrael
| | - Yann Frey
- Department of Human Molecular Genetics and BiochemistryTel Aviv University School of MedicineTel AvivIsrael
| | - Noa Hourvitz
- The Alexander Silberman Institute of Life SciencesThe Hebrew University of JerusalemJerusalemIsrael
| | | | - Yehuda Tzfati
- The Alexander Silberman Institute of Life SciencesThe Hebrew University of JerusalemJerusalemIsrael
| | - Ran Elkon
- Department of Human Molecular Genetics and BiochemistryTel Aviv University School of MedicineTel AvivIsrael
| | - Yael Ziv
- Department of Human Molecular Genetics and BiochemistryTel Aviv University School of MedicineTel AvivIsrael
| | - Yosef Shiloh
- Department of Human Molecular Genetics and BiochemistryTel Aviv University School of MedicineTel AvivIsrael
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19
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Kuhn K, Lederman HM, McGrath-Morrow SA. Ataxia-telangiectasia clinical trial landscape and the obstacles to overcome. Expert Opin Investig Drugs 2023; 32:693-704. [PMID: 37622329 PMCID: PMC10530584 DOI: 10.1080/13543784.2023.2249399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Revised: 07/28/2023] [Accepted: 08/15/2023] [Indexed: 08/26/2023]
Abstract
INTRODUCTION Ataxia telangiectasia (A-T) is a life-limiting autosomal recessive disease characterized by cerebellar degeneration, ocular telangiectasias, and sinopulmonary disease. Since there is no cure for A-T, the standard of care is primarily supportive. AREAS COVERED We review clinical trials available in PubMed from 1990 to 2023 focused on lessening A-T disease burden. These approaches include genetic interventions, such as antisense oligonucleotides, designed to ameliorate disease progression in patients with select mutations. These approaches also include pharmacologic treatments that target oxidative stress, inflammation, and mitochondrial exhaustion, to attenuate neurological progression in A-T. Finally, we discuss the use of biological immunotherapies for the treatment of malignancies and granulomatous disease, along with other supportive therapies being used for the treatment of pulmonary disease and metabolic syndrome. EXPERT OPINION Barriers to successful genetic and pharmacologic interventions in A-T include the need for personalized treatment approaches based on patient-specific ATM mutations and phenotypes, lack of an animal model for the neurologic phenotype, and extreme rarity of disease making large-scale randomized trials difficult to perform. Ongoing efforts are needed to diagnose patients earlier, discover more effective therapies, and include more individuals in clinical trials, with the goal to lessen disease burden and to find a cure for patients with A-T.
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Affiliation(s)
- Katrina Kuhn
- Johns Hopkins University School of Medicine, Baltimore, MD 21287, United States of America
| | - Howard M. Lederman
- Johns Hopkins University Division of Pediatric Allergy and Immunology and School of Medicine, Johns Hopkins University, Baltimore, MD, United States of America
| | - Sharon A. McGrath-Morrow
- Children’s Hospital of Philadelphia Division of Pulmonary Medicine and Sleep and Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America
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20
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Kim J, Woo S, de Gusmao CM, Zhao B, Chin DH, DiDonato RL, Nguyen MA, Nakayama T, Hu CA, Soucy A, Kuniholm A, Thornton JK, Riccardi O, Friedman DA, El Achkar CM, Dash Z, Cornelissen L, Donado C, Faour KNW, Bush LW, Suslovitch V, Lentucci C, Park PJ, Lee EA, Patterson A, Philippakis AA, Margus B, Berde CB, Yu TW. A framework for individualized splice-switching oligonucleotide therapy. Nature 2023; 619:828-836. [PMID: 37438524 PMCID: PMC10371869 DOI: 10.1038/s41586-023-06277-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 05/25/2023] [Indexed: 07/14/2023]
Abstract
Splice-switching antisense oligonucleotides (ASOs) could be used to treat a subset of individuals with genetic diseases1, but the systematic identification of such individuals remains a challenge. Here we performed whole-genome sequencing analyses to characterize genetic variation in 235 individuals (from 209 families) with ataxia-telangiectasia, a severely debilitating and life-threatening recessive genetic disorder2,3, yielding a complete molecular diagnosis in almost all individuals. We developed a predictive taxonomy to assess the amenability of each individual to splice-switching ASO intervention; 9% and 6% of the individuals had variants that were 'probably' or 'possibly' amenable to ASO splice modulation, respectively. Most amenable variants were in deep intronic regions that are inaccessible to exon-targeted sequencing. We developed ASOs that successfully rescued mis-splicing and ATM cellular signalling in patient fibroblasts for two recurrent variants. In a pilot clinical study, one of these ASOs was used to treat a child who had been diagnosed with ataxia-telangiectasia soon after birth, and showed good tolerability without serious adverse events for three years. Our study provides a framework for the prospective identification of individuals with genetic diseases who might benefit from a therapeutic approach involving splice-switching ASOs.
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Affiliation(s)
- Jinkuk Kim
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.
- Biomedical Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.
- KI for Health Science and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.
- Center for Epidemic Preparedness, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.
| | - Sijae Woo
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - Claudio M de Gusmao
- Department of Neurology, Boston Children's Hospital, Boston, MA, USA
- Postgraduate School of Medical Science, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Boxun Zhao
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
- Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA, USA
- Department of Pediatrics, Boston Children's Hospital, Boston, MA, USA
- Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Diana H Chin
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Renata L DiDonato
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Minh A Nguyen
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Tojo Nakayama
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Chunguang April Hu
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Aubrie Soucy
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Ashley Kuniholm
- Institutional Center for Clinical and Translational Research, Boston Children's Hospital, Boston, MA, USA
| | | | - Olivia Riccardi
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Danielle A Friedman
- Department of Neurology, Boston Children's Hospital, Boston, MA, USA
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | | | - Zane Dash
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Laura Cornelissen
- Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, Boston, MA, USA
| | - Carolina Donado
- Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, Boston, MA, USA
| | - Kamli N W Faour
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Lynn W Bush
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
- Department of Pediatrics, Boston Children's Hospital, Boston, MA, USA
- Center for Bioethics, Harvard Medical School, Boston, MA, USA
| | - Victoria Suslovitch
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Claudia Lentucci
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
| | - Peter J Park
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA
| | - Eunjung Alice Lee
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA
- Department of Pediatrics, Boston Children's Hospital, Boston, MA, USA
- Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Al Patterson
- Harvard Medical School, Boston, MA, USA
- Department of Pharmacy, Boston Children's Hospital, Boston, MA, USA
| | - Anthony A Philippakis
- Eric and Wendy Schmidt Center, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Brad Margus
- Ataxia Telangiectasia Children's Project, Coconut Creek, FL, USA
| | - Charles B Berde
- Harvard Medical School, Boston, MA, USA
- Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, Boston, MA, USA
| | - Timothy W Yu
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, USA.
- Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA, USA.
- Department of Pediatrics, Boston Children's Hospital, Boston, MA, USA.
- Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA, USA.
- Harvard Medical School, Boston, MA, USA.
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21
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Sible E, Attaway M, Fiorica G, Michel G, Chaudhuri J, Vuong BQ. Ataxia Telangiectasia Mutated and MSH2 Control Blunt DNA End Joining in Ig Class Switch Recombination. J Immunol 2023; 210:369-376. [PMID: 36603026 PMCID: PMC9915862 DOI: 10.4049/jimmunol.2200590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 12/09/2022] [Indexed: 01/06/2023]
Abstract
Class-switch recombination (CSR) produces secondary Ig isotypes and requires activation-induced cytidine deaminase (AID)-dependent DNA deamination of intronic switch regions within the IgH (Igh) gene locus. Noncanonical repair of deaminated DNA by mismatch repair (MMR) or base excision repair (BER) creates DNA breaks that permit recombination between distal switch regions. Ataxia telangiectasia mutated (ATM)-dependent phosphorylation of AID at serine 38 (pS38-AID) promotes its interaction with apurinic/apyrimidinic endonuclease 1 (APE1), a BER protein, suggesting that ATM regulates CSR through BER. However, pS38-AID may also function in MMR during CSR, although the mechanism remains unknown. To examine whether ATM modulates BER- and/or MMR-dependent CSR, Atm-/- mice were bred to mice deficient for the MMR gene mutS homolog 2 (Msh2). Surprisingly, the predicted Mendelian frequencies of Atm-/-Msh2-/- adult mice were not obtained. To generate ATM and MSH2-deficient B cells, Atm was conditionally deleted on an Msh2-/- background using a floxed ATM allele (Atmf) and B cell-specific Cre recombinase expression (CD23-cre) to produce a deleted ATM allele (AtmD). As compared with AtmD/D and Msh2-/- mice and B cells, AtmD/DMsh2-/- mice and B cells display a reduced CSR phenotype. Interestingly, Sμ-Sγ1 junctions from AtmD/DMsh2-/- B cells that were induced to switch to IgG1 in vitro showed a significant loss of blunt end joins and an increase in insertions as compared with wild-type, AtmD/D, or Msh2-/- B cells. These data indicate that the absence of both ATM and MSH2 blocks nonhomologous end joining, leading to inefficient CSR. We propose a model whereby ATM and MSH2 function cooperatively to regulate end joining during CSR through pS38-AID.
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Affiliation(s)
- Emily Sible
- Biology PhD Program, The Graduate Center, The City University of New York, New York, NY
- Department of Biology, City College of New York, The City University of New York, New York, NY; and
| | - Mary Attaway
- Department of Biology, City College of New York, The City University of New York, New York, NY; and
| | - Giuseppe Fiorica
- Department of Biology, City College of New York, The City University of New York, New York, NY; and
| | - Genesis Michel
- Department of Biology, City College of New York, The City University of New York, New York, NY; and
| | | | - Bao Q. Vuong
- Biology PhD Program, The Graduate Center, The City University of New York, New York, NY
- Department of Biology, City College of New York, The City University of New York, New York, NY; and
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22
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Czarny J, Andrzejewska M, Zając-Spychała O, Latos-Grażyńska E, Pastorczak A, Wypyszczak K, Szczawińska-Popłonyk A, Niewiadomska-Wojnałowicz I, Wziątek A, Marciniak-Stępak P, Dopierała M, Małdyk J, Jończyk-Potoczna K, Derwich K. Successful Treatment of Large B-Cell Lymphoma in a Child with Compound Heterozygous Mutation in the ATM Gene. Int J Mol Sci 2023; 24:ijms24021099. [PMID: 36674612 PMCID: PMC9866559 DOI: 10.3390/ijms24021099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 12/30/2022] [Accepted: 01/05/2023] [Indexed: 01/09/2023] Open
Abstract
Ataxia-telangiectasia (AT) is a multisystemic neurodegenerative inborn error of immunity (IEI) characterized by DNA repair defect, chromosomal instability, and hypersensitivity to ionizing radiation. Impaired DNA double-strand break repair determines a high risk of developing hematological malignancies, especially lymphoproliferative diseases. Poor response to treatment, excessive chemotherapy toxicities, and the need for avoiding exposure to ionizing radiation make the successful clinical management of patients with AT challenging for oncologists. We describe the favorable outcome of the LBCL with IRF4 rearrangement at stage III in a 7-year-old female patient diagnosed with AT. The patient was treated according to the B-HR arm of the INTER-B-NHL-COP 2010 protocol, including the administration of rituximab, cyclophosphamide, methotrexate, prednisone, etc. She presented excessive treatment toxicities despite individually reduced doses of methotrexate and cyclophosphamide. However, in the MRI there was no significant reduction in pathologic lymph nodes after three immunochemotherapy courses. Therefore, a lymph node biopsy was taken. Its subsequent histopathological examination revealed tuberculosis-like changes, though tuberculosis suspicion was excluded. After two following immunochemotherapy courses, PET-CT confirmed complete remission. From March 2022 onwards, the patient has remained in remission under the care of the outpatient children's oncology clinic.
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Affiliation(s)
- Jakub Czarny
- Faculty of Medicine, Poznan University of Medical Sciences, 61-701 Poznań, Poland
| | - Marta Andrzejewska
- Faculty of Medicine, Poznan University of Medical Sciences, 61-701 Poznań, Poland
| | - Olga Zając-Spychała
- Department of Pediatric Oncology, Hematology and Transplantology, Institute of Pediatrics, Poznań University of Medical Sciences, 60-355 Poznań, Poland
| | - Elżbieta Latos-Grażyńska
- Department of Pediatric Bone Marrow Transplantation, Oncology and Hematology, Wrocław Medical University, 50-556 Wrocław, Poland
| | - Agata Pastorczak
- Department of Pediatrics, Oncology and Hematology, Medical University of Łódź, 91-738 Łódź, Poland
| | - Kamila Wypyszczak
- Department of Pediatrics, Oncology and Hematology, Medical University of Łódź, 91-738 Łódź, Poland
| | - Aleksandra Szczawińska-Popłonyk
- Department of Pediatric Pneumonology, Allergy and Clinical Immunology, Institute of Pediatrics, Poznań University of Medical Sciences, 60-355 Poznań, Poland
| | - Izabela Niewiadomska-Wojnałowicz
- Department of Pediatric Oncology, Hematology and Transplantology, Institute of Pediatrics, Poznań University of Medical Sciences, 60-355 Poznań, Poland
| | - Agnieszka Wziątek
- Department of Pediatric Oncology, Hematology and Transplantology, Institute of Pediatrics, Poznań University of Medical Sciences, 60-355 Poznań, Poland
| | - Patrycja Marciniak-Stępak
- Department of Pediatric Oncology, Hematology and Transplantology, Institute of Pediatrics, Poznań University of Medical Sciences, 60-355 Poznań, Poland
| | - Michał Dopierała
- Department of Pediatric Oncology, Hematology and Transplantology, Institute of Pediatrics, Poznań University of Medical Sciences, 60-355 Poznań, Poland
- Department of Pathology and Clinical Immunology, Poznań University of Medical Sciences, 60-355 Poznań, Poland
| | - Jadwiga Małdyk
- Department of Pathology, Medical University of Warsaw, 02-106 Warsaw, Poland
| | - Katarzyna Jończyk-Potoczna
- Department of Pediatric Radiology, Institute of Pediatrics, Poznań University of Medical Sciences, 60-355 Poznań, Poland
| | - Katarzyna Derwich
- Department of Pediatric Oncology, Hematology and Transplantology, Institute of Pediatrics, Poznań University of Medical Sciences, 60-355 Poznań, Poland
- Correspondence:
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23
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Pastorino L, Dalmasso B, Allavena E, Vanni I, Ugolini F, Baroni G, Croce M, Guadagno A, Cabiddu F, Andreotti V, Bruno W, Zoppoli G, Ferrando L, Tanda ET, Spagnolo F, Menin C, Gangemi R, Massi D, Ghiorzo P. Ataxia-Telangiectasia Mutated Loss of Heterozygosity in Melanoma. Int J Mol Sci 2022; 23:ijms232416027. [PMID: 36555667 PMCID: PMC9786167 DOI: 10.3390/ijms232416027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/06/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022] Open
Abstract
ATM germline pathogenic variants were recently found enriched in high-risk melanoma patients. However, ATM loss of heterozygosity (LOH) has never been investigated in melanoma and, therefore, a causal association with melanoma development has not been established yet. The purpose of this study was to functionally characterize 13 germline ATM variants found in high-risk melanoma patients-and classified by in silico tools as pathogenic, uncertain significance, or benign-using multiple assays evaluating ATM/pATM expression and/or LOH in melanoma tissues and cell lines. We assessed ATM status by Immunohistochemistry (IHC), Western Blot, Whole-Exome Sequencing/Copy Number Variation analysis, and RNA sequencing, supported by Sanger sequencing and microsatellite analyses. For most variants, IHC results matched those obtained with in silico classification and LOH analysis. Two pathogenic variants (p.Ser1135_Lys1192del and p.Ser1993ArgfsTer23) showed LOH and complete loss of ATM activation in melanoma. Two variants of unknown significance (p.Asn358Ile and p.Asn796His) showed reduced expression and LOH, suggestive of a deleterious effect. This study, showing a classic two-hit scenario in a well-known tumor suppressor gene, supports the inclusion of melanoma in the ATM-related cancer spectrum.
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Affiliation(s)
- Lorenza Pastorino
- Department of Internal Medicine and Medical Specialties, University of Genoa, 16132 Genoa, Italy
- Genetica dei Tumori Rari, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Bruna Dalmasso
- Genetica dei Tumori Rari, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Eleonora Allavena
- Department of Internal Medicine and Medical Specialties, University of Genoa, 16132 Genoa, Italy
| | - Irene Vanni
- Genetica dei Tumori Rari, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Filippo Ugolini
- Section of Anatomic Pathology, Department of Health Sciences, University of Florence, 50134 Florence, Italy
| | - Gianna Baroni
- Section of Anatomic Pathology, Department of Health Sciences, University of Florence, 50134 Florence, Italy
| | - Michela Croce
- Bioterapie, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Antonio Guadagno
- Anatomia Patologica, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Francesco Cabiddu
- Anatomia Patologica, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Virginia Andreotti
- Genetica dei Tumori Rari, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - William Bruno
- Department of Internal Medicine and Medical Specialties, University of Genoa, 16132 Genoa, Italy
- Genetica dei Tumori Rari, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Gabriele Zoppoli
- Department of Internal Medicine and Medical Specialties, University of Genoa, 16132 Genoa, Italy
- Clinica di Medicina Interna a Indirizzo Oncologico, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Lorenzo Ferrando
- Department of Internal Medicine and Medical Specialties, University of Genoa, 16132 Genoa, Italy
- Clinica di Medicina Interna a Indirizzo Oncologico, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Enrica Teresa Tanda
- Department of Internal Medicine and Medical Specialties, University of Genoa, 16132 Genoa, Italy
- Oncologia Medica 2, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Francesco Spagnolo
- Oncologia Medica 2, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Chiara Menin
- Immunology and Diagnostic Molecular Oncology Unit, Veneto Institute of Oncology, IOV-IRCCS, 35128 Padua, Italy
| | - Rosaria Gangemi
- Bioterapie, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
| | - Daniela Massi
- Section of Anatomic Pathology, Department of Health Sciences, University of Florence, 50134 Florence, Italy
| | - Paola Ghiorzo
- Department of Internal Medicine and Medical Specialties, University of Genoa, 16132 Genoa, Italy
- Genetica dei Tumori Rari, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy
- Correspondence:
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24
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Islam MZ, Shen X, Pardue S, Kevil CG, Shackelford RE. The ataxia-telangiectasia mutated gene product regulates the cellular acid-labile sulfide fraction. DNA Repair (Amst) 2022; 116:103344. [PMID: 35696854 DOI: 10.1016/j.dnarep.2022.103344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 04/30/2022] [Accepted: 05/11/2022] [Indexed: 11/03/2022]
Abstract
The ataxia-telangiectasia mutated (ATM) protein regulates cell cycle checkpoints, the cellular redox state, and double-stranded DNA break repair. ATM loss causes the disorder ataxia-telangiectasia (A-T), distinguished by ataxia, telangiectasias, dysregulated cellular redox and iron responses, and an increased cancer risk. We examined the sulfur pool in A-T cells, with and without an ATM expression vector. While free and bound sulfide levels were not changed with ATM expression, the acid-labile sulfide faction was significantly increased. ATM expression also increased cysteine desulfurase (NFS1), NFU1 iron-sulfur cluster scaffold homolog protein, and several mitochondrial complex I proteins' expression. Additionally, ATM expression suppressed cystathionine β-synthase and cystathionine γ-synthase protein expression, cystathionine γ-synthase enzymatic activity, and increased the reduced to oxidized glutathione ratio. This last observation is interesting, as dysregulated glutathione is implicated in A-T pathology. As ATM expression increases the expression of proteins central in initiating 2Fe-2S and 4Fe-4S cluster formation (NFS1 and NFU1, respectively), and the acid-labile sulfide faction is composed of sulfur incorporated into Fe-S clusters, our data indicates that ATM regulates aspects of Fe-S cluster biosynthesis, the transsulfuration pathway, and glutathione redox cycling. Thus, our data may explain some of the redox- and iron-related pathologies seen in A-T.
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Affiliation(s)
- Mohammad Z Islam
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States
| | - Xinggui Shen
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States
| | - Sibile Pardue
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States
| | - Christopher G Kevil
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States
| | - Rodney E Shackelford
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States.
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25
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Meador JA, Balajee AS. Analysis of ionizing radiation induced DNA damage response in human adult stem cells and differentiated neurons. Mutat Res Genet Toxicol Environ Mutagen 2022; 878:503486. [PMID: 35649680 DOI: 10.1016/j.mrgentox.2022.503486] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 04/10/2022] [Accepted: 04/14/2022] [Indexed: 06/15/2023]
Abstract
Findings of neurodegenerative features associated with human radiosensitive syndromes such as Ataxia telangiectasia suggest that DNA repair efficiency is crucial for maintaining the functional integrity of central nervous system. To gain a better understanding of ionizing radiation (IR) induced DNA damage response in undifferentiated and differentiated neural cell types and to evaluate the role of ATM in DNA double strand break (DSB) repair, an in vitro human neural cell differentiation model system was utilized in this study. As compared to adult stem cells, differentiated neurons displayed an attenuated DSB repair response (as judged by the persistence of 53BP1 foci) after IR exposure and the attenuation was even more pronounced in stem cells and neurons after suppression of ATM (Ataxia Telangiectasia Mutated) gene product suggesting the importance of ATM for an optimal DSB repair efficiency in human neural cell types. In corroboration with an attenuated DNA damage response, a sharp decline in the expression levels of several DSB repair genes was observed in neurons. Our results suggest that cellular differentiation modulates the expression of several genes thereby compromising the DSB repair fidelity in post mitotic neurons. Further studies are required to verify whether or not ATM mediated exacerbation of DNA repair deficiency in differentiated neurons leads to neurodegeneration.
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Affiliation(s)
| | - Adayabalam S Balajee
- Cytogenetic Biodosimetry Laboratory, Radiation Emergency Assistance Center/Training Site, Oak Ridge Institute for Science and Education, Oak Ridge Associated Universities, Oak Ridge, TN, USA.
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26
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Aguado J, Gómez-Inclán C, Leeson HC, Lavin MF, Shiloh Y, Wolvetang EJ. The hallmarks of aging in Ataxia-Telangiectasia. Ageing Res Rev 2022; 79:101653. [PMID: 35644374 DOI: 10.1016/j.arr.2022.101653] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 04/28/2022] [Accepted: 05/24/2022] [Indexed: 01/10/2023]
Abstract
Ataxia-telangiectasia (A-T) is caused by absence of the catalytic activity of ATM, a protein kinase that plays a central role in the DNA damage response, many branches of cellular metabolism, redox and mitochondrial homeostasis, and cell cycle regulation. A-T is a complex disorder characterized mainly by progressive cerebellar degeneration, immunodeficiency, radiation sensitivity, genome instability, and predisposition to cancer. It is increasingly recognized that the premature aging component of A-T is an important driver of this disease, and A-T is therefore an attractive model to study the aging process. This review outlines the current state of knowledge pertaining to the molecular and cellular signatures of aging in A-T and proposes how these new insights can guide novel therapeutic approaches for A-T.
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Affiliation(s)
- Julio Aguado
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Queensland 4072, Australia.
| | - Cecilia Gómez-Inclán
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Queensland 4072, Australia
| | - Hannah C Leeson
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Queensland 4072, Australia
| | - Martin F Lavin
- University of Queensland Centre for Clinical Research, The University of Queensland, Herston, Brisbane, Australia
| | - Yosef Shiloh
- The David and Inez Myers Laboratory of Cancer Genetics, Department of Human Molecular Genetics and Biochemistry, Tel Aviv University School of Medicine, Tel Aviv, Israel
| | - Ernst J Wolvetang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Queensland 4072, Australia.
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27
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Warren R, Dylag AM, Behan M, Domm W, Yee M, Mayer-Pröschel M, Martinez-Sobrido L, O'Reilly MA. Ataxia telangiectasia mutated is required for efficient proximal airway epithelial cell regeneration following influenza A virus infection. Am J Physiol Lung Cell Mol Physiol 2022; 322:L581-L592. [PMID: 35196880 PMCID: PMC8993527 DOI: 10.1152/ajplung.00378.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 01/11/2022] [Accepted: 02/21/2022] [Indexed: 11/22/2022] Open
Abstract
Children and young adults with mutant forms of ataxia telangiectasia mutated (ATM), a kinase involved in DNA damage signaling and mitochondrial homeostasis, suffer from recurrent respiratory infections, immune deficiencies, and obstructive airways disease associated with disorganized airway epithelium. We previously showed in mice how Atm was required to mount a protective immune memory response to influenza A virus [IAV; Hong Kong/X31 (HKx31), H3N2]. Here, Atm wildtype (WT) and knockout (Atm-null) mice were used to investigate how Atm is required to regenerate the injured airway epithelium following IAV infection. When compared with WT mice, naive Atm-null mice had increased airway resistance and reduced lung compliance that worsened during infection before returning to naïve levels by 56 days postinfection (dpi). Although Atm-null lungs appeared pathologically normal before infection by histology, they developed an abnormal proximal airway epithelium after infection that contained E-cadherin+, Sox2+, and Cyp2f2+ cells lacking secretoglobin family 1 A member 1 (Scgb1a1) protein expression. Patchy and low expression of Scgb1a1 were eventually observed by 56 dpi. Genetic lineage tracing in HKx31-infected mice revealed club cells require Atm to rapidly and efficiently restore Scgb1a1 expression in proximal airways. Since Scgb1a1 is an immunomodulatory protein that protects the lung against a multitude of respiratory challenges, failure to efficiently restore its expression may contribute to the respiratory diseases seen in individuals with ataxia telangiectasia.
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Affiliation(s)
- Rachel Warren
- Department of Microbiology and Immunology, School of Medicine and Dentistry, University of Rochester, Rochester, New York
| | - Andrew M Dylag
- Department of Pediatrics, School of Medicine and Dentistry, University of Rochester, Rochester, New York
| | - Molly Behan
- Department of Pediatrics, School of Medicine and Dentistry, University of Rochester, Rochester, New York
| | - William Domm
- Department of Pediatrics, School of Medicine and Dentistry, University of Rochester, Rochester, New York
| | - Min Yee
- Department of Pediatrics, School of Medicine and Dentistry, University of Rochester, Rochester, New York
| | - Margot Mayer-Pröschel
- Biomedical Genetics, School of Medicine and Dentistry, University of Rochester, Rochester, New York
| | - Luis Martinez-Sobrido
- Disease Intervention and Prevention Program, Texas Biomedical Research Institute, San Antonio, Texas
| | - Michael A O'Reilly
- Department of Pediatrics, School of Medicine and Dentistry, University of Rochester, Rochester, New York
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28
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Petley E, Yule A, Alexander S, Ojha S, Whitehouse WP. The natural history of ataxia-telangiectasia (A-T): A systematic review. PLoS One 2022; 17:e0264177. [PMID: 35290391 PMCID: PMC9049793 DOI: 10.1371/journal.pone.0264177] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 02/06/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Ataxia-telangiectasia is an autosomal recessive, multi-system, and life-shortening disease caused by mutations in the ataxia-telangiectasia mutated gene. Although widely reported, there are no studies that give a comprehensive picture of this intriguing condition. OBJECTIVES Understand the natural history of ataxia-telangiectasia (A-T), as reported in scientific literature. SEARCH METHODS 107 search terms were identified and divided into 17 searches. Each search was performed in PubMed, Ovid SP (MEDLINE) 1946-present, OVID EMBASE 1980 -present, Web of Science core collection, Elsevier Scopus, and Cochrane Library. SELECTION CRITERIA All human studies that report any aspect of A-T. DATA COLLECTION AND ANALYSIS Search results were de-duplicated, data extracted (including author, publication year, country of origin, study design, population, participant characteristics, and clinical features). Quality of case-control and cohort studies was assessed by the Newcastle-Ottawa tool. Findings are reported descriptively and where possible data collated to report median (interquartile range, range) of outcomes of interest. MAIN RESULTS 1314 cases reported 2134 presenting symptoms. The most common presenting symptom was abnormal gait (1160 cases; 188 studies) followed by recurrent infections in classical ataxia-telangiectasia and movement disorders in variant ataxia-telangiectasia. 687 cases reported 752 causes of death among which malignancy was the most frequently reported cause. Median (IQR, range) age of death (n = 294) was 14 years 0 months (10 years 0 months to 23 years 3 months, 1 year 3 months to 76 years 0 months). CONCLUSIONS This review demonstrates the multi-system involvement in A-T, confirms that neurological symptoms are the most frequent presenting features in classical A-T but variants have diverse manifestations. We found that most individuals with A-T have life limited to teenage or early adulthood. Predominance of case reports, and case series demonstrate the lack of robust evidence to determine the natural history of A-T. We recommend population-based studies to fill this evidence gap.
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Affiliation(s)
- Emily Petley
- School of Medicine, University of Nottingham, Nottingham, United
Kingdom
| | - Alexander Yule
- United Lincolnshire Hospitals NHS Trust, Lincoln, United
Kingdom
| | - Shaun Alexander
- School of Medicine, University of Nottingham, Nottingham, United
Kingdom
| | - Shalini Ojha
- School of Medicine, University of Nottingham, Nottingham, United
Kingdom
- Children’s Hospital, University Hospitals of Derby and Burton, NHS
Foundation Trust, Derby, United Kingdom
| | - William P. Whitehouse
- School of Medicine, University of Nottingham, Nottingham, United
Kingdom
- Nottingham Children’s Hospital, Nottingham University Hospital NHS Trust,
Nottingham, United Kingdom
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29
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Blanchard-Rohner G, Peirolo A, Coulon L, Korff C, Horvath J, Burkhard PR, Gumy-Pause F, Ranza E, Jandus P, Dibra H, Taylor AMR, Fluss J. Childhood-Onset Movement Disorders Can Mask a Primary Immunodeficiency: 6 Cases of Classical Ataxia-Telangiectasia and Variant Forms. Front Immunol 2022; 13:791522. [PMID: 35154108 PMCID: PMC8831727 DOI: 10.3389/fimmu.2022.791522] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 01/07/2022] [Indexed: 02/02/2023] Open
Abstract
Ataxia-telangiectasia (A-T) is a neurodegenerative and primary immunodeficiency disorder (PID) characterized by cerebellar ataxia, oculocutaneous telangiectasia, immunodeficiency, progressive respiratory failure, and an increased risk of malignancies. It demands specialized care tailored to the individual patient’s needs. Besides the classical ataxia-telangiectasia (classical A-T) phenotype, a variant phenotype (variant A-T) exists with partly overlapping but some distinctive disease characteristics. Here we present a case series of 6 patients with classical A-T and variant A-T, which illustrates the phenotypic variability of A-T that can present in childhood with prominent extrapyramidal features, with or without cerebellar ataxia. We report the clinical data, together with a detailed genotype description, immunological analyses, and related expression of the ATM protein. We show that the presence of some residual ATM kinase activity leads to the clinical phenotype variant A-T that differs from the classical A-T. Our data illustrate that the diagnosis of the variant form of A-T can be delayed and difficult, while early recognition of the variant form as well as the classical A-T is a prerequisite for providing a correct prognosis and appropriate rehabilitation and support, including the avoidance of diagnostic X-ray procedures, given the increased risk of malignancies and the higher risk for side effects of subsequent cancer treatment.
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Affiliation(s)
- Geraldine Blanchard-Rohner
- Paediatric Immunology and Vaccinology Unit, Division of General Pediatrics, Department of Pediatrics, Gynecology and Obstetrics, Geneva University Hospitals, University of Geneva, Geneva, Switzerland
- *Correspondence: Geraldine Blanchard-Rohner,
| | - Anna Peirolo
- Department of Clinical and Experimental Sciences, University of Brescia, ASST Spedali Civili, Brescia, Italy
| | - Ludivine Coulon
- Division of General Pediatrics, Department of Pediatrics, Gynecology and Obstetrics, Geneva University Hospitals, University of Geneva, Geneva, Switzerland
| | - Christian Korff
- Pediatric Neurology Unit, Department of Pediatrics, Gynecology and Obstetrics, Geneva University Hospitals, University of Geneva, Geneva, Switzerland
| | - Judit Horvath
- Department of Neurology, University Hospitals of Geneva, Geneva, Switzerland
| | - Pierre R. Burkhard
- Department of Neurology, University Hospitals of Geneva, Geneva, Switzerland
| | - Fabienne Gumy-Pause
- Division of Pediatric Oncology and Hematology, Department of Women, Child and Adolescent Medicine, Geneva University Hospitals, Geneva, Switzerland
- CANSEARCH Research Platform for Pediatric Oncology and Hematology, Department of Pediatrics, Gynaecology and Obstetrics, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Emmanuelle Ranza
- Medigenome, Swiss Institute of Genomic Medicine, Geneva, Switzerland
| | - Peter Jandus
- Division of Immunology and Allergology, University Hospitals and Medical Faculty of Geneva, Geneva, Switzerland
| | - Harpreet Dibra
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, United Kingdom
| | | | - Joel Fluss
- Pediatric Neurology Unit, Department of Pediatrics, Gynecology and Obstetrics, Geneva University Hospitals, University of Geneva, Geneva, Switzerland
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Ricci A, Biancucci F, Morganti G, Magnani M, Menotta M. New human ATM variants are able to regain ATM functions in ataxia telangiectasia disease. Cell Mol Life Sci 2022; 79:601. [PMID: 36422718 PMCID: PMC9691487 DOI: 10.1007/s00018-022-04625-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 10/28/2022] [Accepted: 11/08/2022] [Indexed: 11/25/2022]
Abstract
Ataxia telangiectasia is a rare neurodegenerative disease caused by biallelic mutations in the ataxia telangiectasia mutated gene. No cure is currently available for these patients but positive effects on neurologic features in AT patients have been achieved by dexamethasone administration through autologous erythrocytes (EryDex) in phase II and phase III clinical trials, leading us to explore the molecular mechanisms behind the drug action. During these investigations, new ATM variants, which originated from alternative splicing of ATM messenger, were discovered, and detected in vivo in the blood of AT patients treated with EryDex. Some of the new ATM variants, alongside an in silico designed one, were characterized and examined in AT fibroblast cell lines. ATM variants were capable of rescuing ATM activity in AT cells, particularly in the nuclear role of DNA DSBs recognition and repair, and in the cytoplasmic role of modulating autophagy, antioxidant capacity and mitochondria functionality, all of the features that are compromised in AT but essential for neuron survival. These outcomes are triggered by the kinase and further functional domains of the tested ATM variants, that are useful for restoring cellular functionality. The in silico designed ATM variant eliciting most of the functionality recover may be exploited in gene therapy or gene delivery for the treatment of AT patients.
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Affiliation(s)
- Anastasia Ricci
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Via Saffi 2, 61029, Urbino, Italy.
| | - Federica Biancucci
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Via Saffi 2, 61029, Urbino, Italy
| | - Gianluca Morganti
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Via Saffi 2, 61029, Urbino, Italy
| | - Mauro Magnani
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Via Saffi 2, 61029, Urbino, Italy
| | - Michele Menotta
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Via Saffi 2, 61029, Urbino, Italy
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Sule A, Golding SE, Ahmad SF, Watson J, Ahmed MH, Kellogg GE, Bernas T, Koebley S, Reed JC, Povirk LF, Valerie K. ATM phosphorylates PP2A subunit A resulting in nuclear export and spatiotemporal regulation of the DNA damage response. Cell Mol Life Sci 2022; 79:603. [PMID: 36434396 PMCID: PMC9700600 DOI: 10.1007/s00018-022-04550-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Revised: 08/30/2022] [Accepted: 09/07/2022] [Indexed: 11/26/2022]
Abstract
Ataxia telangiectasia mutated (ATM) is a serine-threonine protein kinase and important regulator of the DNA damage response (DDR). One critical ATM target is the structural subunit A (PR65-S401) of protein phosphatase 2A (PP2A), known to regulate diverse cellular processes such as mitosis and cell growth as well as dephosphorylating many proteins during the recovery from the DDR. We generated mouse embryonic fibroblasts expressing PR65-WT, -S401A (cannot be phosphorylated), and -S401D (phospho-mimetic) transgenes. Significantly, S401 mutants exhibited extensive chromosomal aberrations, impaired DNA double-strand break (DSB) repair and underwent increased mitotic catastrophe after radiation. Both S401A and the S401D cells showed impaired DSB repair (nonhomologous end joining and homologous recombination repair) and exhibited delayed DNA damage recovery, which was reflected in reduced radiation survival. Furthermore, S401D cells displayed increased ERK and AKT signaling resulting in enhanced growth rate further underscoring the multiple roles ATM-PP2A signaling plays in regulating prosurvival responses. Time-lapse video and cellular localization experiments showed that PR65 was exported to the cytoplasm after radiation by CRM1, a nuclear export protein, in line with the very rapid pleiotropic effects observed. A putative nuclear export sequence (NES) close to S401 was identified and when mutated resulted in aberrant PR65 shuttling. Our study demonstrates that the phosphorylation of a single, critical PR65 amino acid (S401) by ATM fundamentally controls the DDR, and balances DSB repair quality, cell survival and growth by spatiotemporal PR65 nuclear-cytoplasmic shuttling mediated by the nuclear export receptor CRM1.
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Affiliation(s)
- Amrita Sule
- Department of Radiation Oncology, Virginia Commonwealth University, Richmond, VA, 23298-0058, USA
- Department of Biochemistry and Molecular Biology, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Sarah E Golding
- Department of Radiation Oncology, Virginia Commonwealth University, Richmond, VA, 23298-0058, USA
| | - Syed F Ahmad
- Department of Radiation Oncology, Virginia Commonwealth University, Richmond, VA, 23298-0058, USA
- Department of Biochemistry and Molecular Biology, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - James Watson
- Department of Radiation Oncology, Virginia Commonwealth University, Richmond, VA, 23298-0058, USA
| | - Mostafa H Ahmed
- Department of Medicinal Chemistry, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Glen E Kellogg
- Department of Medicinal Chemistry, Virginia Commonwealth University, Richmond, VA, 23298, USA
- Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Tytus Bernas
- Department of Anatomy, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Sean Koebley
- Department of Physics, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Jason C Reed
- Department of Physics, Virginia Commonwealth University, Richmond, VA, 23298, USA
- Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Lawrence F Povirk
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA, 23298, USA
- Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Kristoffer Valerie
- Department of Radiation Oncology, Virginia Commonwealth University, Richmond, VA, 23298-0058, USA.
- Department of Biochemistry and Molecular Biology, Virginia Commonwealth University, Richmond, VA, 23298, USA.
- Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, 23298, USA.
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Fahmy EM, Salama EH, El-Mokhtar MA, Sadek AA. Clinical and immunological assessment of children with ataxia telangiectasia attending Sohag university hospital in Upper Egypt. Egypt J Immunol 2021; 28:272-281. [PMID: 34882376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Ataxia Telangiectasia (AT) is a very rare autosomal recessive primary immune deficiency (PID) disease that affects 1 in 10,000-40,000 new births per year in the world. It is caused by biallelic mutations in ataxia telangiectasia mutated (ATM) gene and characterized by a progressive cerebellar ataxia. The clinical profile of AT children in Upper Egypt in missing. Herein, we evaluated the clinical characteristics and immunological profiles of patients with AT attending Sohag University Hospital. This was a cross-sectional study, included 21 AT patients attending the Neurological and Immunological Units, Pediatric Department, Sohag University Hospital, starting April 2018 to the end of March 2019. AT represented 20.5% of all PID patients attending the hospital. The most common type of humoral immune deficiency in patients with AT was specific IgA deficiency (52.3%) followed by hypogammaglobulinemia (23.8%). Recurrent sinopulmonary infection with different degrees of severity was the common immunological problem. The most common neurological manifestations in our studied patients, other than the ataxia, were language delay and eye movement abnormalities followed by developmental delay and head nodding. None of our patients had developed malignancy till the end of the study.
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Affiliation(s)
- Eman M Fahmy
- Department of Pediatric, Sohag General Hospital, Sohag, Egypt
| | - Eman H Salama
- Department of Clinical Pathology, Sohag General Hospital, Sohag, Egypt
| | - Mohamed A El-Mokhtar
- Department of Medical Microbiology & Immunology , Faculty of Medicine, Assiut University, Assiut, Egypt
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Bistritzer J, Mijalovsky A, Nissenkorn A, Flusser H, Levy J, Nahum A, Broides A. Phenotypic variability in patients with unique double homozygous mutations causing variant ataxia telangiectasia. Eur J Paediatr Neurol 2021; 32:36-39. [PMID: 33743388 DOI: 10.1016/j.ejpn.2021.03.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/06/2021] [Accepted: 03/02/2021] [Indexed: 11/17/2022]
Abstract
Ataxia-Telangiectasia (A-T) is a neurodegenerative disease caused by bi-allelic mutations in the Ataxia-Telangiectasia-Mutated (ATM) gene. Complete lack of ATM activity leads to severe A-T and mutations allowing for residual activity cause a milder phenotype, termed variant A-T. There are only sparse data on the variability in phenotypes of variant A-T patients carrying the same mutations. A retrospective study of 15 patients with variant A-T, all double homozygous for the same mutations was conducted. The age of first symptom ranged from 4-180 months, including: truncal ataxia at <18 months of age in 9 patients, ataxia and instability only during fever in one patient, dystonia in one patient and malignancy in 4 patients. Global developmental delay and occulo-motor apraxia were recorded in 4/14 patients. Variant A-T patients with the same mutations in ATM, have variable phenotypes. Environmental, epigenetic, and post translational factors are likely to play a role in creation of the phenotype in variant A-T patients.
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Affiliation(s)
- Jacob Bistritzer
- Zusman Child Development Center, Soroka University Medical Center, Beer-Sheva, Israel; Joyce and Irving Goldman Medical School, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel.
| | - Analia Mijalovsky
- Zusman Child Development Center, Soroka University Medical Center, Beer-Sheva, Israel; Joyce and Irving Goldman Medical School, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
| | - Andreea Nissenkorn
- Pediatric Neurology Unit, Edith Wolfson Medical Center, Holon, Israel; National AT Center, Chaim Sehba Medical Center, Ramat-Gan, Israel; The Sackler School of Medicine, Tel Aviv Univerity. Tel Aviv, Israel
| | - Hagit Flusser
- Zusman Child Development Center, Soroka University Medical Center, Beer-Sheva, Israel; Joyce and Irving Goldman Medical School, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
| | - Jacov Levy
- Pediatric Immunology, Soroka University Medical Center, Beer-Sheva, Israel; Joyce and Irving Goldman Medical School, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
| | - Amit Nahum
- Department of Pediatrics A, Soroka University Medical Center, Beer-Sheva, Israel; Pediatric Immunology, Soroka University Medical Center, Beer-Sheva, Israel; Joyce and Irving Goldman Medical School, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
| | - Arnon Broides
- Pediatric Immunology, Soroka University Medical Center, Beer-Sheva, Israel; Joyce and Irving Goldman Medical School, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva, Israel
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Milanovic M, Houghton LM, Menolfi D, Lee JH, Yamamoto K, Li Y, Lee BJ, Xu J, Estes VM, Wang D, Mckinnon PJ, Paull TT, Zha S. The Cancer-Associated ATM R3008H Mutation Reveals the Link between ATM Activation and Its Exchange. Cancer Res 2021; 81:426-437. [PMID: 33239428 PMCID: PMC8137556 DOI: 10.1158/0008-5472.can-20-2447] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/14/2020] [Accepted: 11/18/2020] [Indexed: 11/16/2022]
Abstract
ATM kinase is a tumor suppressor and a master regulator of the DNA damage response. Most cancer-associated alterations to ATM are missense mutations at the PI3-kinase regulatory domain (PRD) or the kinase domain. Expression of kinase-dead (KD) ATM protein solely accelerates lymphomagenesis beyond ATM loss. To understand how PRD suppresses lymphomagenesis, we introduced the cancer-associated PRD mutation R3008H (R3016 in mouse) into mice. R3008H abrogated DNA damage- and oxidative stress-induced activation of ATM without consistently affecting ATM protein stability and recruitment. In contrast to the early embryonic lethality of AtmKD/KD mice, AtmR3016H (AtmR/R ) mice were viable, immunodeficient, and displayed spontaneous craniofacial abnormalities and delayed lymphomagenesis compared with Atm-/- controls. Mechanistically, R3008H rescued the tardy exchange of ATM-KD at DNA damage foci, indicating that PRD coordinates ATM activation with its exchange at DNA-breaks. Taken together, our results reveal a unique tumorigenesis profile for PRD mutations that is distinct from null or KD mutations. SIGNIFICANT: This study functionally characterizes the most common ATM missense mutation R3008H in cancer and identifies a unique role of PI3-kinase regulatory domain in ATM activation.
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Affiliation(s)
- Maja Milanovic
- Institute for Cancer Genetics, College of Physicians and Surgeons, Columbia University, New York City, New York
| | - Lisa M Houghton
- Institute for Cancer Genetics, College of Physicians and Surgeons, Columbia University, New York City, New York
- Department of Pathology and Cell Biology, Pathobiology and Human Disease Graduate Program, Vagelos College for Physicians and Surgeons, Columbia University, New York, New York
| | - Demis Menolfi
- Institute for Cancer Genetics, College of Physicians and Surgeons, Columbia University, New York City, New York
| | - Ji-Hoon Lee
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
| | - Kenta Yamamoto
- Institute for Cancer Genetics, College of Physicians and Surgeons, Columbia University, New York City, New York
- Department of Pathology and Cell Biology, Pathobiology and Human Disease Graduate Program, Vagelos College for Physicians and Surgeons, Columbia University, New York, New York
| | - Yang Li
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, Tennessee
| | - Brian J Lee
- Institute for Cancer Genetics, College of Physicians and Surgeons, Columbia University, New York City, New York
| | - Jun Xu
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California
| | - Verna M Estes
- Institute for Cancer Genetics, College of Physicians and Surgeons, Columbia University, New York City, New York
| | - Dong Wang
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California
| | - Peter J Mckinnon
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, Tennessee
| | - Tanya T Paull
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
| | - Shan Zha
- Institute for Cancer Genetics, College of Physicians and Surgeons, Columbia University, New York City, New York.
- Division of Pediatric Oncology, Hematology and Stem Cell Transplantation, Department of Pediatrics, College of Physicians and Surgeons, Columbia University, New York City, New York
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Shi Y, Liu Z, Zhang Q, Vallee I, Mo Z, Kishi S, Yang XL. Phosphorylation of seryl-tRNA synthetase by ATM/ATR is essential for hypoxia-induced angiogenesis. PLoS Biol 2020; 18:e3000991. [PMID: 33351793 PMCID: PMC7755189 DOI: 10.1371/journal.pbio.3000991] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 11/19/2020] [Indexed: 01/09/2023] Open
Abstract
Hypoxia-induced angiogenesis maintains tissue oxygen supply and protects against ischemia but also enhances tumor progression and malignancy. This is mediated through activation of transcription factors like hypoxia-inducible factor 1 (HIF-1) and c-Myc, yet the impact of hypoxia on negative regulators of angiogenesis is unknown. During vascular development, seryl-tRNA synthetase (SerRS) regulates angiogenesis through a novel mechanism by counteracting c-Myc and transcriptionally repressing vascular endothelial growth factor A (VEGFA) expression. Here, we reveal that the transcriptional repressor role of SerRS is inactivated under hypoxia through phosphorylation by ataxia telangiectasia mutated (ATM) and ataxia telangiectasia mutated and RAD3-related (ATR) at Ser101 and Ser241 to attenuate its DNA binding capacity. In zebrafish, SerRSS101D/S241D, a phosphorylation-mimicry mutant, cannot suppress VEGFA expression to support normal vascular development. Moreover, expression of SerRSS101A/S241A, a phosphorylation-deficient and constitutively active mutant, prevents hypoxia-induced binding of c-Myc and HIF-1 to the VEGFA promoter, and activation of VEGFA expression. Consistently, SerRSS101A/S241A strongly inhibits normal and tumor-derived angiogenesis in mice. Therefore, we reveal a key step regulating hypoxic angiogenesis and highlight the importance of nuclear SerRS in post-developmental angiogenesis regulation in addition to vascular development. The role of nuclear SerRS in inhibiting both c-Myc and HIF-1 may provide therapeutic opportunities to correct dysregulation of angiogenesis in pathological settings.
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Affiliation(s)
- Yi Shi
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, United States of America
- School of Medicine, Nankai University, Tianjin, China
- * E-mail: (YS); (X-LY)
| | - Ze Liu
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, United States of America
| | - Qian Zhang
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, United States of America
| | - Ingrid Vallee
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, United States of America
| | - Zhongying Mo
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, United States of America
| | - Shuji Kishi
- Department of Metabolism and Aging, The Scripps Research Institute, Jupiter, Florida, United States of America
| | - Xiang-Lei Yang
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, United States of America
- * E-mail: (YS); (X-LY)
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Khanal S, Tang Q, Cao D, Zhao J, Nguyen LN, Oyedeji OS, Dang X, Nguyen LNT, Schank M, Thakuri BKC, Ogbu C, Morrison ZD, Wu XY, Zhang Z, He Q, El Gazzar M, Li Z, Ning S, Wang L, Moorman JP, Yao ZQ. Telomere and ATM Dynamics in CD4 T-Cell Depletion in Active and Virus-Suppressed HIV Infections. J Virol 2020; 94:e01061-20. [PMID: 32907975 PMCID: PMC7592222 DOI: 10.1128/jvi.01061-20] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 08/29/2020] [Indexed: 12/12/2022] Open
Abstract
CD4 T-cell depletion is a hallmark of HIV/AIDS, but the underlying mechanism is still unclear. We have recently shown that ataxia-telangiectasia-mutated (ATM) deficiency in CD4 T cells accelerates DNA damage, telomere erosion, and cell apoptosis in HIV-infected individuals on antiretroviral therapy (ART). Whether these alterations in ART-treated HIV subjects occur in vitro in HIV-infected CD4 T cells remains unknown. In this study, we employed a cellular model of HIV infection to characterize the mechanisms underlying CD4 T-cell destruction by analyzing the telomeric DNA damage response (DDR) and cellular apoptosis in highly permissive SupT1 cells, followed by the validation of our observations in primary CD4 T cells with active or drug-suppressed HIV infection. Specifically, we established an in vitro HIV T-cell culture system with viral replication and raltegravir (RAL; an integrase inhibitor) suppression, mimicking active and ART-controlled HIV infection in vivo We demonstrated that HIV-induced, telomeric DDR plays a pivotal role in triggering telomere erosion, premature T-cell aging, and CD4 T-cell apoptosis or depletion via dysregulation of the PI3K/ATM pathways. This in vitro model provides a new tool to investigate HIV pathogenesis, and our results shed new light on the molecular mechanisms of telomeric DDR and CD4 T-cell homeostasis during HIV infection.IMPORTANCE The hallmark of HIV infection is a gradual depletion of CD4 T cells, with a progressive decline of host immunity. How CD4 T cells are depleted in individuals with active and virus-suppressed HIV infection remains unclear. In this study, we employed a cellular model of HIV infection to characterize the mechanisms underlying CD4 T-cell destruction by analyzing the chromosome end (telomere) DNA damage response (DDR) and cellular apoptosis in a T-cell line (highly permissive SupT1 cells), as well as in primary CD4 T cells with active or drug-suppressed HIV infection. We demonstrated that HIV-induced telomeric DDR plays a critical role in inducing telomere loss, premature cell aging, and CD4 T-cell apoptosis or depletion via dysregulation of the PI3K/ATM pathways. This study sheds new light on the molecular mechanisms of telomeric DDR and its role in CD4 T-cell homeostasis during HIV infection.
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Affiliation(s)
- Sushant Khanal
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Qiyuan Tang
- The Third People's Hospital, Shenzhen, China
| | - Dechao Cao
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Juan Zhao
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Lam Nhat Nguyen
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Oluwayomi Samson Oyedeji
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Xindi Dang
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Lam Ngoc Thao Nguyen
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Madison Schank
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Bal Krishna Chand Thakuri
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Chinyere Ogbu
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Zheng D Morrison
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Xiao Y Wu
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Zheng Zhang
- The Third People's Hospital, Shenzhen, China
| | - Qing He
- The Third People's Hospital, Shenzhen, China
| | - Mohamed El Gazzar
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
| | - Zhengke Li
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Shunbin Ning
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Ling Wang
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
| | - Jonathan P Moorman
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
- Hepatitis (HCV/HBV/HIV) Program, James H. Quillen VA Medical Center, Department of Veterans Affairs, Johnson City, Tennessee, USA
| | - Zhi Q Yao
- Center of Excellence in Inflammation, Infectious Disease and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, USA
- Department of Internal Medicine, Division of Infectious, Inflammatory and Immunologic Diseases, Quillen College of Medicine, ETSU, Johnson City, Tennessee, USA
- Hepatitis (HCV/HBV/HIV) Program, James H. Quillen VA Medical Center, Department of Veterans Affairs, Johnson City, Tennessee, USA
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Shiloh Y. The cerebellar degeneration in ataxia-telangiectasia: A case for genome instability. DNA Repair (Amst) 2020; 95:102950. [PMID: 32871349 DOI: 10.1016/j.dnarep.2020.102950] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 08/05/2020] [Accepted: 08/08/2020] [Indexed: 02/06/2023]
Abstract
Research on the molecular pathology of genome instability disorders has advanced our understanding of the complex mechanisms that safeguard genome stability and cellular homeostasis at large. Once the culprit genes and their protein products are identified, an ongoing dialogue develops between the research lab and the clinic in an effort to link specific disease symptoms to the functions of the proteins that are missing in the patients. Ataxi A-T elangiectasia (A-T) is a prominent example of this process. A-T's hallmarks are progressive cerebellar degeneration, immunodeficiency, chronic lung disease, cancer predisposition, endocrine abnormalities, segmental premature aging, chromosomal instability and radiation sensitivity. The disease is caused by absence of the powerful protein kinase, ATM, best known as the mobilizer of the broad signaling network induced by double-strand breaks (DSBs) in the DNA. In parallel, ATM also functions in the maintenance of the cellular redox balance, mitochondrial function and turnover and many other metabolic circuits. An ongoing discussion in the A-T field revolves around the question of which ATM function is the one whose absence is responsible for the most debilitating aspect of A-T - the cerebellar degeneration. This review suggests that it is the absence of a comprehensive role of ATM in responding to ongoing DNA damage induced mainly by endogenous agents. It is the ensuing deterioration and eventual loss of cerebellar Purkinje cells, which are very vulnerable to ATM absence due to a unique combination of physiological features, which kindles the cerebellar decay in A-T.
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Affiliation(s)
- Yosef Shiloh
- The David and Inez Myers Laboratory for Cancer Genetics, Department of Human Molecular Genetics and Biochemistry, Tel Aviv University Medical School, Tel Aviv, 69978, Israel.
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Ragamin A, Yigit G, Bousset K, Beleggia F, Verheijen FW, de Wit MY, Strom TM, Dörk T, Wollnik B, Mancini GMS. Human RAD50 deficiency: Confirmation of a distinctive phenotype. Am J Med Genet A 2020; 182:1378-1386. [PMID: 32212377 PMCID: PMC7318339 DOI: 10.1002/ajmg.a.61570] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 02/24/2020] [Accepted: 03/09/2020] [Indexed: 12/13/2022]
Abstract
DNA double-strand breaks (DSBs) are highly toxic DNA lesions that can lead to chromosomal instability, loss of genes and cancer. The MRE11/RAD50/NBN (MRN) complex is keystone involved in signaling processes inducing the repair of DSB by, for example, in activating pathways leading to homologous recombination repair and nonhomologous end joining. Additionally, the MRN complex also plays an important role in the maintenance of telomeres and can act as a stabilizer at replication forks. Mutations in NBN and MRE11 are associated with Nijmegen breakage syndrome (NBS) and ataxia telangiectasia (AT)-like disorder, respectively. So far, only one single patient with biallelic loss of function variants in RAD50 has been reported presenting with features classified as NBS-like disorder. Here, we report a long-term follow-up of an unrelated patient with facial dysmorphisms, microcephaly, skeletal features, and short stature who is homozygous for a novel variant in RAD50. We could show that this variant, c.2524G > A in exon 15 of the RAD50 gene, induces aberrant splicing of RAD50 mRNA mainly leading to premature protein truncation and thereby, most likely, to loss of RAD50 function. Using patient-derived primary fibroblasts, we could show abnormal radioresistant DNA synthesis confirming pathogenicity of the identified variant. Immunoblotting experiments showed strongly reduced protein levels of RAD50 in the patient-derived fibroblasts and provided evidence for a markedly reduced radiation-induced AT-mutated signaling. Comparison with the previously reported case and with patients presenting with NBS confirms that RAD50 mutations lead to a similar, but distinctive phenotype.
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Affiliation(s)
- Aviël Ragamin
- Department of Clinical GeneticsErasmus MC University Medical CenterRotterdamThe Netherlands
| | - Gökhan Yigit
- Institute of Human GeneticsUniversity Medical Center GöttingenGöttingenGermany
| | - Kristine Bousset
- Department of Gynecology and ObstetricsHannover Medical SchoolHannoverGermany
| | - Filippo Beleggia
- Clinic I of Internal MedicineUniversity Hospital CologneCologneGermany
| | - Frans W. Verheijen
- Department of Clinical GeneticsErasmus MC University Medical CenterRotterdamThe Netherlands
| | - Marie‐Claire Y. de Wit
- Department of Child NeurologySophia Children's Hospital, Erasmus MC University Medical CenterRotterdamNetherlands
- ENCORE Expertise Center for Neurodevelopmental DisordersRotterdamThe Netherlands
| | - Tim M. Strom
- Institute of Human GeneticsHelmholtz Zentrum MünchenNeuherbergGermany
- Institute of Human GeneticsTechnische Universität MünchenMunichGermany
| | - Thilo Dörk
- Department of Gynecology and ObstetricsHannover Medical SchoolHannoverGermany
| | - Bernd Wollnik
- Institute of Human GeneticsUniversity Medical Center GöttingenGöttingenGermany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC)University of GöttingenGöttingenGermany
| | - Grazia M. S. Mancini
- Department of Clinical GeneticsErasmus MC University Medical CenterRotterdamThe Netherlands
- ENCORE Expertise Center for Neurodevelopmental DisordersRotterdamThe Netherlands
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McGrath-Morrow SA, Ndeh R, Helmin KA, Khuder B, Rothblum-Oviatt C, Collaco JM, Wright J, Reyfman PA, Lederman HM, Singer BD. DNA methylation and gene expression signatures are associated with ataxia-telangiectasia phenotype. Sci Rep 2020; 10:7479. [PMID: 32366930 PMCID: PMC7198504 DOI: 10.1038/s41598-020-64514-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 04/13/2020] [Indexed: 12/19/2022] Open
Abstract
People with ataxia-telangiectasia (A-T) display phenotypic variability with regard to progression of immunodeficiency, sino-pulmonary disease, and neurologic decline. To determine the association between differential gene expression, epigenetic state, and phenotypic variation among people with A-T, we performed transcriptional and genome-wide DNA methylation profiling in patients with mild and classic A-T progression as well as healthy controls. RNA and genomic DNA were isolated from peripheral blood mononuclear cells for transcriptional and DNA methylation profiling with RNA-sequencing and modified reduced representation bisulfite sequencing, respectively. We identified 555 genes that were differentially expressed among the control, mild A-T, and classic A-T groups. Genome-wide DNA methylation profiling revealed differential promoter methylation in cis with 146 of these differentially expressed genes. Functional enrichment analysis identified significant enrichment in immune, growth, and apoptotic pathways among the methylation-regulated genes. Regardless of clinical phenotype, all A-T participants exhibited downregulation of critical genes involved in B cell function (PAX5, CD79A, CD22, and FCRL1) and upregulation of several genes associated with senescence and malignancy, including SERPINE1. These findings indicate that gene expression differences may be associated with phenotypic variability and suggest that DNA methylation regulates expression of critical immune response genes in people with A-T.
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Affiliation(s)
- Sharon A McGrath-Morrow
- Eudowood Division of Pediatric Respiratory Sciences, Johns Hopkins School of Medicine, Baltimore, MD, USA.
| | - Roland Ndeh
- Eudowood Division of Pediatric Respiratory Sciences, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Kathryn A Helmin
- Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Basil Khuder
- Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | | | - Joseph M Collaco
- Eudowood Division of Pediatric Respiratory Sciences, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Jennifer Wright
- Eudowood Division of Pediatric, Allergy and Immunology, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Paul A Reyfman
- Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Howard M Lederman
- Eudowood Division of Pediatric, Allergy and Immunology, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Benjamin D Singer
- Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
- Simpson Querrey Center for Epigenetics, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
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40
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Völkening L, Vatselia A, Asgedom G, Bastians H, Lavin M, Schindler D, Schambach A, Bousset K, Dörk T. RAD50 regulates mitotic progression independent of DNA repair functions. FASEB J 2020; 34:2812-2820. [PMID: 31908056 DOI: 10.1096/fj.201902318r] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 12/02/2019] [Accepted: 12/10/2019] [Indexed: 11/11/2022]
Abstract
The Mre11A/RAD50/NBN complex (MRN) is an essential regulator of the cellular damage response after DNA double-strand breaks (DSBs). More recent work has indicated that MRN may also impact on the duration of mitosis. We show here that RAD50-deficient fibroblasts exhibit a marked delay in mitotic progression that can be rescued by lentiviral transduction of RAD50. The delay was observed throughout all mitotic phases in live cell imaging using GFP-labeled H2B as a fluorescent marker. In complementation assays with RAD50 phosphorylation mutants, modifications at Ser635 had little effect on mitotic progression. By contrast with RAD50, fibroblast strains deficient in ATM or NBN did not show a significant slowing of mitotic progression. Ataxia-telangiectasia-like disorder (ATLD) fibroblasts with nuclease-deficient MRE11A (p.W210C) tended to show slower mitosis, though by far not as significant as RAD50-deficient cells. Inhibitor studies indicated that ATM kinase activity might not grossly impact on mitotic progression, while treatment with MRE11A inhibitor PFM39 modestly prolonged mitosis. Inhibition of ATR kinase significantly prolonged mitosis but this effect was mostly independent of RAD50 status. Taken together, our data unravel a mitotic role of RAD50 that can be separated from its known functions in DNA repair.
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Affiliation(s)
- Lea Völkening
- Gynaecology Research Unit, Hannover Medical School, Hannover, Germany
| | - Anna Vatselia
- Gynaecology Research Unit, Hannover Medical School, Hannover, Germany
| | - Girmay Asgedom
- Institute of Experimental Hematology, Hannover Medical School, Hannover, Germany
| | - Holger Bastians
- Institute of Molecular Oncology, Universitätsmedizin Göttingen, Göttingen, Germany
| | - Martin Lavin
- Queensland Institute of Medical Research, Brisbane, Australia
| | - Detlev Schindler
- Institute of Human Genetics, Biocenter, University Würzburg, Würzburg, Germany
| | - Axel Schambach
- Institute of Experimental Hematology, Hannover Medical School, Hannover, Germany
- Division of Hematology/Oncology, Boston Children's Hospital, Harvard Medical School, MA, USA
| | - Kristine Bousset
- Gynaecology Research Unit, Hannover Medical School, Hannover, Germany
| | - Thilo Dörk
- Gynaecology Research Unit, Hannover Medical School, Hannover, Germany
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Bergom C, West CM, Higginson DS, Abazeed ME, Arun B, Bentzen SM, Bernstein JL, Evans JD, Gerber NK, Kerns SL, Keen J, Litton JK, Reiner AS, Riaz N, Rosenstein BS, Sawakuchi GO, Shaitelman SF, Powell SN, Woodward WA. The Implications of Genetic Testing on Radiation Therapy Decisions: A Guide for Radiation Oncologists. Int J Radiat Oncol Biol Phys 2019; 105:698-712. [PMID: 31381960 DOI: 10.1016/j.ijrobp.2019.07.026] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 06/21/2019] [Accepted: 07/08/2019] [Indexed: 02/06/2023]
Abstract
The advent of affordable and rapid next-generation DNA sequencing technology, along with the US Supreme Court ruling invalidating gene patents, has led to a deluge of germline and tumor genetic variant tests that are being rapidly incorporated into clinical cancer decision-making. A major concern for clinicians is whether the presence of germline mutations may increase the risk of radiation toxicity or secondary malignancies. Because scarce clinical data exist to inform decisions at this time, the American Society for Radiation Oncology convened a group of radiation science experts and clinicians to summarize potential issues, review relevant data, and provide guidance for adult patients and their care teams regarding the impact, if any, that genetic testing should have on radiation therapy recommendations. During the American Society for Radiation Oncology workshop, several main points emerged, which are discussed in this manuscript: (1) variants of uncertain significance should be considered nondeleterious until functional genomic data emerge to demonstrate otherwise; (2) possession of germline alterations in a single copy of a gene critical for radiation damage responses does not necessarily equate to increased risk of radiation-induced toxicity; (3) deleterious ataxia-telangiesctasia gene mutations may modestly increase second cancer risk after radiation therapy, and thus follow-up for these patients after indicated radiation therapy should include second cancer screening; (4) conveying to patients the difference between relative and absolute risk is critical to decision-making; and (5) more work is needed to assess the impact of tumor somatic alterations on the probability of response to radiation therapy and the potential for individualization of radiation doses. Data on radiosensitivity related to specific genetic mutations is also briefly discussed.
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Affiliation(s)
- Carmen Bergom
- Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Catharine M West
- Division of Cancer Sciences, National Institute for Health Research Manchester Biomedical Research Centre, University of Manchester, Christie National Health Service Foundation Trust Hospital, Manchester, UK
| | - Daniel S Higginson
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Mohamed E Abazeed
- Department of Radiation Oncology, Cleveland Clinic, Cleveland, Ohio; Department of Translational Hematology Oncology Research, Cleveland Clinic, Cleveland, Ohio
| | - Banu Arun
- Department of Breast Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Soren M Bentzen
- Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland
| | - Jonine L Bernstein
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Jaden D Evans
- Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota; Department of Radiation Oncology and Precision Genomics, Intermountain Healthcare, Ogden, Utah
| | - Naamit K Gerber
- Department of Radiation Oncology, New York University Langone Health, New York, New York
| | - Sarah L Kerns
- Department of Radiation Oncology, University of Rochester, Rochester, New York
| | - Judy Keen
- Scientific Affairs, American Society for Radiation Oncology, Arlington, Virginia
| | - Jennifer K Litton
- Department of Breast Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Anne S Reiner
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Nadeem Riaz
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Barry S Rosenstein
- Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, New York; Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Gabriel O Sawakuchi
- Department of Radiation Physics The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Simona F Shaitelman
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Simon N Powell
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Wendy A Woodward
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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42
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Blom M, Schoenaker MHD, Hulst M, de Vries MC, Weemaes CMR, Willemsen MAAP, Henneman L, van der Burg M. Dilemma of Reporting Incidental Findings in Newborn Screening Programs for SCID: Parents' Perspective on Ataxia Telangiectasia. Front Immunol 2019; 10:2438. [PMID: 31781088 PMCID: PMC6851017 DOI: 10.3389/fimmu.2019.02438] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 09/30/2019] [Indexed: 12/20/2022] Open
Abstract
Background: Ataxia Telangiectasia (A-T) is a severe DNA repair disorder that leads to a broad range of symptoms including neurodegeneration and a variable immunodeficiency. A-T is one of the incidental findings that accompanies newborn screening (NBS) for severe combined immunodeficiency (SCID), leading to an early diagnosis of A-T at birth in a pre-symptomatic stage. While some countries embrace all incidental findings, the current policy in the Netherlands on reporting untreatable incidental findings is more conservative. We present parents' perspectives and considerations on the various advantages vs. disadvantages of early and late diagnosis of A-T. Methods: A questionnaire was developed and sent to 4,000 parents of healthy newborns who participated in the Dutch SONNET-study (implementation pilot for newborn screening for SCID). The questionnaire consisted of open-ended and scale questions on advantages and disadvantages of early and late diagnosis of A-T. To address potential bias, demographic characteristics of the study sample were compared to a reference population. Results: A total of 664 of 4,000 parents sent back the questionnaire (response rate 16.6%). The vast majority of parents (81.9%) favored early diagnosis of A-T over late diagnosis. Main arguments were to avoid a long period of uncertainty prior to diagnosis and to ensure the most optimal clinical care and guidance from the onset of symptoms. Parents who favored late diagnosis of A-T stated that early diagnosis would not lead to improved quality of life and preferred to enjoy the asymptomatic "golden years" with their child. The majority of parents (81.1%) stated that they would participate in newborn screening for A-T if a test was available. Conclusions: Reporting untreatable incidental findings remains a disputed topic worldwide. Although the current policy in the Netherlands is not to report untreatable incidental findings, unless the health advantage is clear, the majority of parents of healthy newborns are in favor of an early A-T diagnosis in the pre-symptomatic phase of the disorder. Our results as well as other studies that showed support for the screening of untreatable disorders may serve as valuable tools to inform policymakers in their considerations about NBS for untreatable disorders.
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Affiliation(s)
- Maartje Blom
- Department of Pediatrics, Leiden University Medical Centre, Leiden, Netherlands
| | - Michiel H. D. Schoenaker
- Department of Pediatric Neurology, Radboudumc Amalia Children's Hospital and Donders Institute for Brain, Cognition and Behavior, Radboud University Medical Center, Nijmegen, Netherlands
| | - Myrthe Hulst
- Department of Biologicals, Innovation and Screening, National Institute for Public Health and the Environment, Bilthoven, Netherlands
| | - Martine C. de Vries
- Department of Medical Ethics and Health Law, Leiden University Medical Center, Leiden, Netherlands
| | - Corry M. R. Weemaes
- Department of Pediatrics, Radboudumc Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, Netherlands
| | - Michèl A. A. P. Willemsen
- Department of Pediatric Neurology, Radboudumc Amalia Children's Hospital and Donders Institute for Brain, Cognition and Behavior, Radboud University Medical Center, Nijmegen, Netherlands
- Department of Pediatrics, Radboudumc Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, Netherlands
| | - Lidewij Henneman
- Department of Clinical Genetics, Amsterdam Reproduction & Development Research Institute, Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, Netherlands
| | - Mirjam van der Burg
- Department of Pediatrics, Leiden University Medical Centre, Leiden, Netherlands
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Masneri S, Ferraro RM, Lanzi G, Piovani G, Mori L, Barisani C, Moratto D, Plebani A, Badolato R, Soresina A, Giliani S. Generation of induced Pluripotent Stem Cells (UNIBSi008-A, UNIBSi008-B, UNIBSi008-C) from an Ataxia-Telangiectasia (AT) patient carrying a novel homozygous deletion in ATM gene. Stem Cell Res 2019; 41:101596. [PMID: 31669783 DOI: 10.1016/j.scr.2019.101596] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 09/17/2019] [Accepted: 09/19/2019] [Indexed: 11/17/2022] Open
Abstract
Using a Sendai Virus based vector delivering Yamanaka Factors, we generated induced Pluripotent Stem Cells (iPSCs) from peripheral blood mononuclear cells of a patient affected by Ataxia Telangiectasia (AT), caused by a novel homozygous deletion in ATM, spanning exons 5-7. Three clones were fully characterized for pluripotency and capability to differentiate. These clones preserved the causative mutation of parental cells and genomic stability over time (>100 passages). Furthermore, in AT derived iPSCs we confirmed the impaired DNA damage response after ionizing radiation. All these data underline potential usefulness of our clones as in vitro AT disease model.
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Affiliation(s)
- S Masneri
- "Angelo Nocivelli" Institute for Molecular Medicine, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy.
| | - R M Ferraro
- "Angelo Nocivelli" Institute for Molecular Medicine, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - G Lanzi
- "Angelo Nocivelli" Institute for Molecular Medicine, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - G Piovani
- Biology and Genetics Division, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - L Mori
- Molecular Medicine Laboratory, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - C Barisani
- "Angelo Nocivelli" Institute for Molecular Medicine, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - D Moratto
- "Angelo Nocivelli" Institute for Molecular Medicine, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - A Plebani
- Pediatrics Clinic and "Angelo Nocivelli" Institute for Molecular Medicine, Department of Clinical and Experimental Sciences, ASST Spedali Civili of Brescia, University of Brescia, Brescia, Italy
| | - R Badolato
- Pediatrics Clinic and "Angelo Nocivelli" Institute for Molecular Medicine, Department of Clinical and Experimental Sciences, ASST Spedali Civili of Brescia, University of Brescia, Brescia, Italy
| | - A Soresina
- Unit of Pediatric Immunology, Department of Pediatrics, ASST Spedali Civili of Brescia, University of Brescia, Brescia, Italy
| | - S Giliani
- "Angelo Nocivelli" Institute for Molecular Medicine, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
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Taylor AMR, Rothblum-Oviatt C, Ellis NA, Hickson ID, Meyer S, Crawford TO, Smogorzewska A, Pietrucha B, Weemaes C, Stewart GS. Chromosome instability syndromes. Nat Rev Dis Primers 2019; 5:64. [PMID: 31537806 PMCID: PMC10617425 DOI: 10.1038/s41572-019-0113-0] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/29/2019] [Indexed: 01/28/2023]
Abstract
Fanconi anaemia (FA), ataxia telangiectasia (A-T), Nijmegen breakage syndrome (NBS) and Bloom syndrome (BS) are clinically distinct, chromosome instability (or breakage) disorders. Each disorder has its own pattern of chromosomal damage, with cells from these patients being hypersensitive to particular genotoxic drugs, indicating that the underlying defect in each case is likely to be different. In addition, each syndrome shows a predisposition to cancer. Study of the molecular and genetic basis of these disorders has revealed mechanisms of recognition and repair of DNA double-strand breaks, DNA interstrand crosslinks and DNA damage during DNA replication. Specialist clinics for each disorder have provided the concentration of expertise needed to tackle their characteristic clinical problems and improve outcomes. Although some treatments of the consequences of a disorder may be possible, for example, haematopoietic stem cell transplantation in FA and NBS, future early intervention to prevent complications of disease will depend on a greater understanding of the roles of the affected DNA repair pathways in development. An important realization has been the predisposition to cancer in carriers of some of these gene mutations.
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Affiliation(s)
- A Malcolm R Taylor
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK.
| | | | - Nathan A Ellis
- The University of Arizona Cancer Center, Tucson, AZ, USA
| | - Ian D Hickson
- Center for Chromosome Stability, Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Stefan Meyer
- Stem Cell and Leukaemia Proteomics Laboratory, and Paediatric and Adolescent Oncology, Institute of Cancer Sciences, University of Manchester, Manchester, UK
- Department of Paediatric and Adolescent Haematology and Oncology, Royal Manchester Children's Hospital and The Christie NHS Trust, Manchester, UK
| | - Thomas O Crawford
- Department of Neurology and Pediatrics, Johns Hopkins University, Baltimore, MD, USA
| | - Agata Smogorzewska
- Laboratory of Genome Maintenance, Rockefeller University, New York, NY, USA
| | - Barbara Pietrucha
- Department of Immunology, The Children's Memorial Health Institute, Warsaw, Poland
| | - Corry Weemaes
- Department of Pediatrics (Pediatric Immunology), Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, Netherlands
| | - Grant S Stewart
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
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45
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Chen Y, Chen G, Li J, Huang YY, Li Y, Lin J, Chen LZ, Lu JP, Wang YQ, Wang CX, Pan LK, Xia XF, Yi X, Chen CB, Zheng XW, Guo ZQ, Pan JJ. Association of Tumor Protein p53 and Ataxia-Telangiectasia Mutated Comutation With Response to Immune Checkpoint Inhibitors and Mortality in Patients With Non-Small Cell Lung Cancer. JAMA Netw Open 2019; 2:e1911895. [PMID: 31539077 PMCID: PMC6755545 DOI: 10.1001/jamanetworkopen.2019.11895] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
IMPORTANCE Immune checkpoint inhibitors (ICIs) can elicit durable antitumor responses in patients with non-small cell lung cancer (NSCLC), but only 20% to 25% of patients respond to treatment. As important genes in the DNA damage response pathway, comutation in the tumor protein p53 (TP53) and ataxia-telangiectasia mutated (ATM) genes may be associated with genomic instability and hypermutation. However, the prevalence of TP53 and ATM comutation and its association with response to ICIs are not fully understood. OBJECTIVE To examine the prevalence of the TP53 and ATM comutation, the potential mechanism, and its association with response to ICIs among patients with NSCLC. DESIGN, SETTING, AND PARTICIPANTS This multiple-cohort study included patients with NSCLC from the Geneplus Institute, the Cancer Genome Atlas (TCGA), and the Memorial Sloan Kettering Cancer Center (MSKCC) databases and from the POPLAR and OAK randomized controlled trials. Samples in the Geneplus cohort were collected and analyzed from April 30, 2015, through February 28, 2019. Data from TCGA, the MSKCC, and the POPLAR and OAK cohorts were obtained on January 1, 2019, and analyzed from January 1 to April 10, 2019. Next-generation sequencing assays were performed on tumor samples by the Geneplus Institute. Genomic, transcriptomic, and clinical data were obtained from TCGA and MSKCC databases. EXPOSURES Comprehensive genetic profiling was performed to determine the prevalence of TP53 and ATM comutation and its association with prognosis and response to ICIs. MAIN OUTCOMES AND MEASURES The main outcomes were TP53 and ATM comutation frequency, overall survival (OS), progression-free survival, gene set enrichment analysis, and immune profile in NSCLC. RESULTS Patients with NSCLC analyzed in this study included 2020 patients in the Geneplus cohort (mean [SD] age, 59.5 [10.5] years; 1168 [57.8%] men), 1031 patients in TCGA cohort (mean [SD] age, 66.2 [9.5] years; 579 [56.2%] men), 1527 patients in the MSKCC cohort (662 [43.4%] men), 350 patients in the MSKCC cohort who were treated with ICIs (mean [SD] age, 61.4 [13.8] years; 170 [48.6%] men), and 853 patients in the POPLAR and OAK cohort (mean [SD] age, 63.0 [9.1] years; 527 [61.8%] men). Sites of TP53 and ATM comutation were found scattered throughout the genes, and no significant difference was observed in the frequency of TP53 and ATM comutation within the histologic subtypes and driver genes. In 5 independent cohorts of patients with NSCLC, TP53 and ATM comutation was associated with a significantly higher tumor mutation burden compared with the sole mutation and with no mutation (TCGA, MSKCC, Geneplus, and POPLAR and OAK cohort). Among patients treated with ICIs in the MSKCC cohort, TP53 and ATM comutation was associated with better OS than a single mutation and no mutation among patients with any cancer (median OS: TP53 and ATM comutation, not reached; TP53 mutation alone, 14.0 months; ATM mutation alone, 40.0 months; no mutation, 22.0 months; P = .001; NSCLC median OS: TP53 and ATM comutation, not reached; TP53 mutation alone, 11.0 months; ATM mutation alone, 16.0 months; no mutation, 14.0 months; P = .24). Similar results were found in the POPLAR and OAK cohort in which the disease control benefit rate, progression-free survival, and OS were all greater in patients with the TP53 and ATM comutation compared with the other 3 groups (median progression-free survival: TP53 and ATM comutation, 10.4 months; TP53 mutation, 1.6 months; ATM mutation, 3.5 months; no mutation, 2.8 months; P = .01; median OS: TP53 and ATM comutation, 22.1 months; TP53 mutation, 8.3 months; ATM mutation, 15.8 months; no mutation, 15.3 months; P = .002). CONCLUSIONS AND RELEVANCE This study's findings suggest that the TP53 and ATM comutation occurs in a subgroup of patients with NSCLC and is associated with an increased tumor mutation burden and response to ICIs. This suggests that TP53 and ATM comutation may have implications as a biomarker for guiding ICI treatment.
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Affiliation(s)
- Yu Chen
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Medical Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Gang Chen
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Department of Pathology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Jin Li
- Geneplus-Beijing Institute, Beijing, China
| | | | - Yi Li
- Fujian Medical University Cancer Hospital, Fuzhou, China
| | - Jing Lin
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Medical Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Li-Zhu Chen
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Medical Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Jian-Ping Lu
- Department of Pathology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Yu-Qi Wang
- Geneplus-Beijing Institute, Beijing, China
| | | | - Leong Kin Pan
- China Certification and Inspection Group, Kuok Kim Medical Center III, Macao, China
- Hui Xian Medical Center, Macao, China
| | | | - Xin Yi
- Geneplus-Beijing Institute, Beijing, China
| | - Chuan-Ben Chen
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Radiation Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Xiong-Wei Zheng
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Department of Pathology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Zeng-Qing Guo
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Medical Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Jian-Ji Pan
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Radiation Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
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Biagiotti S, Bianchi M, Rossi L, Chessa L, Magnani M. Activation of NRF2 by dexamethasone in ataxia telangiectasia cells involves KEAP1 inhibition but not the inhibition of p38. PLoS One 2019; 14:e0216668. [PMID: 31107893 PMCID: PMC6527213 DOI: 10.1371/journal.pone.0216668] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 04/26/2019] [Indexed: 01/20/2023] Open
Abstract
Oxidative stress has been shown to play a crucial role in the pathophysiology of the neurodegenerative disease Ataxia Telangiectasia. We have recently demonstrated that Dexamethasone treatment is able to counteract the oxidative state by promoting nuclear factor erythroid 2-related factor 2 (NRF2) nuclear accumulation. However, substantial gaps remain in our knowledge of the underlying molecular mechanism(s) according to which Dexamethasone acts as an NRF2 inducer. Herein we investigate the possible effects of the drug on the main NRF2 activation pathways by initially focusing on key kinases known to differently affect NRF2 activation. Neither AKT nor ERK1/2, known to be NRF2-activating kinases, were found to be activated upon Dexamethasone treatment, thus excluding their involvement in the transcription factor nuclear shift. Likewise, GSK3 inactivating kinase was not inhibited, thus ruling out its role in NRF2 activation. On the other hand, p38 MAPK, another NRF2-inhibitory kinase, was indeed switched-off in Ataxia Telangiectasia cells by Dexamethasone-mediated induction of DUSP1 phosphatase, and therefore it appeared that it might account for NRF2 triggering. However, this mechanism was excluded by the use of a selective p38 inhibitor, which failed to cause a significant NRF2 nuclear shift and target gene induction. Finally, dexamethasone effects on the classical oxidative pathway orchestrated by KEAP1 were addressed. Dexamethasone was found to decrease the expression of the inhibitor KEAP1 at both mRNA and protein levels and to induce the shift from the reduced to the oxidized form of KEAP1, thus favouring NRF2 translocation into the nucleus. Furthermore, preliminary data revealed very low levels of the negative regulator Fyn in Ataxia Telangiectasia cells, which might account for the prolonged NRF2-activated gene expression.
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Affiliation(s)
- Sara Biagiotti
- Department of Biomolecular Sciences, University of Urbino, Urbino, Italy
- * E-mail:
| | - Marzia Bianchi
- Department of Biomolecular Sciences, University of Urbino, Urbino, Italy
| | - Luigia Rossi
- Department of Biomolecular Sciences, University of Urbino, Urbino, Italy
| | - Luciana Chessa
- Department of Clinical and Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | - Mauro Magnani
- Department of Biomolecular Sciences, University of Urbino, Urbino, Italy
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van Os NJH, Chessa L, Weemaes CMR, van Deuren M, Fiévet A, van Gaalen J, Mahlaoui N, Roeleveld N, Schrader C, Schindler D, Taylor AMR, Van de Warrenburg BPC, Dörk T, Willemsen MAAP. Genotype-phenotype correlations in ataxia telangiectasia patients with ATM c.3576G>A and c.8147T>C mutations. J Med Genet 2019; 56:308-316. [PMID: 30819809 DOI: 10.1136/jmedgenet-2018-105635] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 11/21/2018] [Accepted: 12/19/2018] [Indexed: 11/03/2022]
Abstract
BACKGROUND Ataxia telangiectasia (A-T) is a neurodegenerative disorder. While patients with classic A-T generally die in their 20s, some patients with variant A-T, who have residual ataxia-telangiectasia mutated (ATM) kinase activity, have a milder phenotype. We noticed two commonly occurring ATM mutations that appeared to be associated with prolonged survival and decided to study patients carrying one of these mutations. METHODS Data were retrospectively collected from the Dutch, Italian, German and French A-T cohorts. To supplement these data, we searched the literature for patients with identical genotypes. RESULTS This study included 35 patients who were homozygous or compound heterozygous for the ATM c.3576G>A; p.(Ser1135_Lys1192del58) mutation and 24 patients who were compound heterozygous for the ATM c.8147T>C; p.(Val2716Ala) mutation. Compared with 51 patients with classic A-T from the Dutch cohort, patients with ATM c.3576G>A had a longer survival and were less likely to develop cancer, respiratory disease or immunodeficiency. This was also true for patients with ATM c.8147T>C, who additionally became wheelchair users later in life and had fewer telangiectasias. The oldest patient with A-T reported so far was a 78-year-old patient who was compound heterozygous for ATM c.8147T>C. ATM kinase activity was demonstrated in cells from all patients tested with the ATM c.8147T>C mutant protein and only at a low level in some patients with ATM c.3576G>A. CONCLUSION Compared with classic A-T, the presence of ATM c.3576G>A results in a milder classic phenotype. Patients with ATM c.8147T>C have a variant phenotype with prolonged survival, which in exceptional cases may approach a near-normal lifespan.
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Affiliation(s)
- Nienke J H van Os
- Department of Pediatric Neurology, Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, the Netherlands
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Luciana Chessa
- Department of Clinical and Molecular Medicine, Sapienza Università di Roma, Rome, Italy
| | - Corry M R Weemaes
- Department of Pediatrics, Pediatric Infectious Disease and Immunology, Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Marcel van Deuren
- Department of Internal Medicine, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Alice Fiévet
- INSERM UMR 830, Institut de recherche, Institut Curie, PSL Research University, Paris, France
- Service de Génétique, Institut Curie Hôpital, Paris, France
| | - Judith van Gaalen
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Nizar Mahlaoui
- French National Reference Center for Primary Immune Deficiencies (CEREDIH), Pediatric Immuno-Haematology and Rheumatology Unit, Biostatistics Unit, Necker Enfants Malades University Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR 1163, Imagine Institute, Paris, France
- INSERM UMR 1163, Sorbonne Paris Cité, Imagine Institute, Paris Descartes University, Paris, France
| | - Nel Roeleveld
- Department of Health Evidence, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Detlev Schindler
- Institute of Human Genetics, University of Wurzburg, Wurzburg, Germany
| | | | - Bart P C Van de Warrenburg
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Thilo Dörk
- Gynaecology Research Unit, Hannover Medical School, Hannover, Germany
| | - Michèl A A P Willemsen
- Department of Pediatric Neurology, Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, the Netherlands
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Paucar M, Schechtmann G, Taylor AM, Svenningsson P. Variant ataxia-telangiectasia with prominent camptocormia. Parkinsonism Relat Disord 2019; 62:253-255. [PMID: 30579816 DOI: 10.1016/j.parkreldis.2018.12.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 12/05/2018] [Accepted: 12/15/2018] [Indexed: 01/02/2023]
Affiliation(s)
- Martin Paucar
- Department of Neurology, Karolinska University Hospital, Stockholm, Sweden; Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
| | - Gaston Schechtmann
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Department of Neurosurgery, Karolinska University Hospital, Stockholm, Sweden
| | - Alexander Mr Taylor
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Per Svenningsson
- Department of Neurology, Karolinska University Hospital, Stockholm, Sweden; Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
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49
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Amirifar P, Ranjouri MR, Yazdani R, Abolhassani H, Aghamohammadi A. Ataxia-telangiectasia: A review of clinical features and molecular pathology. Pediatr Allergy Immunol 2019; 30:277-288. [PMID: 30685876 DOI: 10.1111/pai.13020] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2018] [Revised: 12/29/2018] [Accepted: 12/30/2018] [Indexed: 01/09/2023]
Abstract
Ataxia-telangiectasia (A-T) is an autosomal recessive primary immunodeficiency (PID) disease that is caused by mutations in ataxia-telangiectasia mutated (ATM) gene encoding a serine/threonine protein kinase. A-T patients represent a broad range of clinical manifestations including progressive cerebellar ataxia, oculocutaneous telangiectasia, variable immunodeficiency, radiosensitivity, susceptibility to malignancies, and increased metabolic diseases. This congenital disorder has phenotypic heterogeneity, and the severity of symptoms varies in different patients based on severity of mutations and disease progression. The principal role of nuclear ATM is the coordination of cellular signaling pathways in response to DNA double-strand breaks, oxidative stress, and cell cycle checkpoint. The pathogenesis of A-T is not limited to the role of ATM in the DNA damage response (DDR) pathway, and it has other functions mainly in the hematopoietic cells and neurons. ATM adjusts the functions of organelles such as mitochondria and peroxisomes and also regulates angiogenesis and glucose metabolisms. However, ATM has other functions in the cells (especially cell viability) that need further investigations. In this review, we described functions of ATM in the nucleus and cytoplasm, and also its association with some disorder formation such as neurologic, immunologic, vascular, pulmonary, metabolic, and dermatologic complications.
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Affiliation(s)
- Parisa Amirifar
- Medical Genetics Department, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Ranjouri
- Molecular Medicine and Genetics Department, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Reza Yazdani
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran, Iran
- University of Medical Science, Tehran, Iran
| | - Hassan Abolhassani
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran, Iran
- University of Medical Science, Tehran, Iran
- Division of Clinical Immunology, Department of Laboratory Medicine, Karolinska Institute at Karolinska University Hospital Huddinge, Stockholm, Sweden
| | - Asghar Aghamohammadi
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran, Iran
- University of Medical Science, Tehran, Iran
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50
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Minto H, Mensah KA, Reynolds PR, Meffre E, Rubtsova K, Gelfand EW. A novel ATM mutation associated with elevated atypical lymphocyte populations, hyper-IgM, and cutaneous granulomas. Clin Immunol 2019; 200:55-63. [PMID: 30639167 PMCID: PMC7027322 DOI: 10.1016/j.clim.2019.01.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 12/26/2018] [Accepted: 01/08/2019] [Indexed: 12/25/2022]
Abstract
Ataxia-Telangiectasia (AT) is an immunodeficiency most often associated with T cell abnormalities. We describe a patient with a hyper-IgM phenotype and immune cell abnormalities that suggest a distinct clinical phenotype. Significant B cell abnormalities with increased unswitched memory B cells, decreased naive transitional B cells, and an elevated frequency of CD19+CD38loCD27-CD10-CD21-/low B cells expressing high levels of T-bet and Fas were demonstrated. The B cells were hyporesponsive to in vitro stimulation through the B cell receptor, Toll like receptors (TLR) 7 and 9, and CD40. T cell homeostasis was also disturbed with a significant increase in γδ T cells, circulating T follicular helper cells (Tfh), and decreased numbers of T regulatory cells. The ATM mutations in this patient are posited to have resulted in the perturbations in the frequencies and distributions of B and T cell subsets, resulting in the phenotype in this patient. KEY MESSAGES: A novel mutation creating a premature stop codon and a nonsense mutation in the ATM gene are postulated to have resulted in the unique clinical picture characterized by abnormal B and T cell populations, lymphocyte subset dysfunction, granuloma formation, and a hyper-IgM phenotype. CAPSULE SUMMARY: A patient presented with ataxia-telangiectasia, cutaneous granulomas, and a hyper-IgM phenotype; a novel combination of mutations in the ATM gene was associated with abnormal distributions, frequencies, and function of T and B lymphocyte subsets.
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Affiliation(s)
- Heather Minto
- Immunodeficiency Diagnosis and Treatment Program, Department of Pediatrics, National Jewish Health, Denver, CO 80206, United States
| | - Kofi A Mensah
- Department of Immunobiology and Division of Rheumatology, Yale University School of Medicine, New Haven, CT 06511, United States
| | - Paul R Reynolds
- Immunodeficiency Diagnosis and Treatment Program, Department of Pediatrics, National Jewish Health, Denver, CO 80206, United States
| | - Eric Meffre
- Department of Immunobiology and Division of Rheumatology, Yale University School of Medicine, New Haven, CT 06511, United States
| | - Kira Rubtsova
- Department of Biomedical Research, National Jewish Health, Denver, CO 80206, United States
| | - Erwin W Gelfand
- Immunodeficiency Diagnosis and Treatment Program, Department of Pediatrics, National Jewish Health, Denver, CO 80206, United States.
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