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Parsons BL, Beal MA, Dearfield KL, Douglas GR, Gi M, Gollapudi BB, Heflich RH, Horibata K, Kenyon M, Long AS, Lovell DP, Lynch AM, Myers MB, Pfuhler S, Vespa A, Zeller A, Johnson GE, White PA. Severity of effect considerations regarding the use of mutation as a toxicological endpoint for risk assessment: A report from the 8th International Workshop on Genotoxicity Testing (IWGT). ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2024. [PMID: 38828778 DOI: 10.1002/em.22599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/13/2024] [Accepted: 04/15/2024] [Indexed: 06/05/2024]
Abstract
Exposure levels without appreciable human health risk may be determined by dividing a point of departure on a dose-response curve (e.g., benchmark dose) by a composite adjustment factor (AF). An "effect severity" AF (ESAF) is employed in some regulatory contexts. An ESAF of 10 may be incorporated in the derivation of a health-based guidance value (HBGV) when a "severe" toxicological endpoint, such as teratogenicity, irreversible reproductive effects, neurotoxicity, or cancer was observed in the reference study. Although mutation data have been used historically for hazard identification, this endpoint is suitable for quantitative dose-response modeling and risk assessment. As part of the 8th International Workshops on Genotoxicity Testing, a sub-group of the Quantitative Analysis Work Group (WG) explored how the concept of effect severity could be applied to mutation. To approach this question, the WG reviewed the prevailing regulatory guidance on how an ESAF is incorporated into risk assessments, evaluated current knowledge of associations between germline or somatic mutation and severe disease risk, and mined available data on the fraction of human germline mutations expected to cause severe disease. Based on this review and given that mutations are irreversible and some cause severe human disease, in regulatory settings where an ESAF is used, a majority of the WG recommends applying an ESAF value between 2 and 10 when deriving a HBGV from mutation data. This recommendation may need to be revisited in the future if direct measurement of disease-causing mutations by error-corrected next generation sequencing clarifies selection of ESAF values.
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Affiliation(s)
- Barbara L Parsons
- Division of Genetic and Molecular Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, USA
| | - Marc A Beal
- Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Ottawa, Ontario, Canada
| | - Kerry L Dearfield
- U.S. Environmental Protection Agency and U.S. Department of Agriculture, Washington, DC, USA
| | - George R Douglas
- Environmental Health Science and Research Bureau, Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Ontario, Canada
| | - Min Gi
- Department of Environmental Risk Assessment, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | | | - Robert H Heflich
- Division of Genetic and Molecular Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, USA
| | | | - Michelle Kenyon
- Portfolio and Regulatory Strategy, Drug Safety Research and Development, Pfizer, Groton, Connecticut, USA
| | - Alexandra S Long
- Existing Substances Risk Assessment Bureau, Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Ontario, Canada
| | - David P Lovell
- Population Health Research Institute, St George's Medical School, University of London, London, UK
| | | | - Meagan B Myers
- Division of Genetic and Molecular Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas, USA
| | | | - Alisa Vespa
- Pharmaceutical Drugs Directorate, Health Products and Food Branch, Health Canada, Ottawa, Ontario, Canada
| | - Andreas Zeller
- Pharmaceutical Sciences, pRED Innovation Center Basel, Hoffmann-La Roche Ltd, Basel, Switzerland
| | - George E Johnson
- Swansea University Medical School, Swansea University, Swansea, Wales, UK
| | - Paul A White
- Environmental Health Science and Research Bureau, Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Ontario, Canada
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2
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Aluri J, Cooper MA. Somatic mosaicism in inborn errors of immunity: Current knowledge, challenges, and future perspectives. Semin Immunol 2023; 67:101761. [PMID: 37062181 PMCID: PMC11321052 DOI: 10.1016/j.smim.2023.101761] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 04/03/2023] [Accepted: 04/05/2023] [Indexed: 04/18/2023]
Abstract
Inborn errors of immunity (IEI) are a diverse group of monogenic disorders of the immune system due to germline variants in genes important for the immune response. Over the past decade there has been increasing recognition that acquired somatic variants present in a subset of cells can also lead to immune disorders or 'phenocopies' of IEI. Discovery of somatic mosaicism causing IEI has largely arisen from investigation of seemingly sporadic cases of IEI with predominant symptoms of autoinflammation and/or autoimmunity in which germline disease-causing variants are not detected. Disease-causing somatic mosaicism has been identified in genes that also cause germline IEI, such as FAS, and in genes without significant corresponding germline disease, such as UBA1 and TLR8. There are challenges in detecting low-level somatic variants, and it is likely that the extent of the somatic mosaicism causing IEI is largely uncharted. Here we review the field of somatic mosaicism leading to IEI and discuss challenges and methods for somatic variant detection, including diagnostic approaches for molecular diagnoses of patients.
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Affiliation(s)
- Jahnavi Aluri
- Department of Pediatrics, Division of Rheumatology/Immunology, Washington University in St. Louis, St. Louis, MO 63110, USA
| | - Megan A Cooper
- Department of Pediatrics, Division of Rheumatology/Immunology, Washington University in St. Louis, St. Louis, MO 63110, USA.
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3
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Solís-Moruno M, Batlle-Masó L, Bonet N, Aróstegui JI, Casals F. Somatic genetic variation in healthy tissue and non-cancer diseases. Eur J Hum Genet 2023; 31:48-54. [PMID: 36289407 PMCID: PMC9823099 DOI: 10.1038/s41431-022-01213-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 09/19/2022] [Accepted: 10/03/2022] [Indexed: 02/08/2023] Open
Abstract
Somatic genetic variants have been studied for several years mostly concerning cancer, where they contribute to its origin and development. It is also clear that the somatic variants load is greater in aged individuals in comparison to younger ones, pointing to a cause/consequence of the senescence process. More recently, researchers have focused on the role of this type of variation in healthy tissue and its dynamics in cell lineages and different organs. In addition, somatic variants have been described to contribute to monogenic diseases, and the number of evidences of their role in complex disorders is also increasing. Thanks to recent advances in next-generation sequencing technologies, this type of genetic variation can be now more easily studied than in the past, although we still face some important limitations. Novel strategies for sampling, sequencing and filtering are being investigated to detect these variants, although validating them with an orthogonal approach will most likely still be needed. In this review, we aim to update our knowledge of somatic variation detection and its relation to healthy tissue and non-cancer diseases.
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Affiliation(s)
- Manuel Solís-Moruno
- grid.5612.00000 0001 2172 2676Institut de Biologia Evolutiva (CSIC-UPF), Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Doctor Aiguader 88, Barcelona, Spain ,grid.5612.00000 0001 2172 2676Genomics Core Facility, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Parc de Recerca Biomèdica de Barcelona, 08003 Barcelona, Spain ,grid.410458.c0000 0000 9635 9413Department of Immunology, Hospital Clínic, Barcelona, Spain ,grid.10403.360000000091771775Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Laura Batlle-Masó
- grid.7080.f0000 0001 2296 0625Pediatric Infectious Diseases and Immunodeficiencies Unit, Hospital Universitari Vall d’Hebron (HUVH), Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Núria Bonet
- grid.5612.00000 0001 2172 2676Genomics Core Facility, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Parc de Recerca Biomèdica de Barcelona, 08003 Barcelona, Spain
| | - Juan I. Aróstegui
- grid.410458.c0000 0000 9635 9413Department of Immunology, Hospital Clínic, Barcelona, Spain ,grid.10403.360000000091771775Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain ,grid.5841.80000 0004 1937 0247Universitat de Barcelona, Barcelona, Spain
| | - Ferran Casals
- grid.5612.00000 0001 2172 2676Genomics Core Facility, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Parc de Recerca Biomèdica de Barcelona, 08003 Barcelona, Spain ,grid.5841.80000 0004 1937 0247Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain ,grid.5841.80000 0004 1937 0247Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Barcelona, Spain
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Batlle-Masó L, Garcia-Prat M, Parra-Martínez A, Franco-Jarava C, Aguiló-Cucurull A, Velasco P, Antolín M, Rivière JG, Martín-Nalda A, Soler-Palacín P, Martínez-Gallo M, Colobran R. Detection and evolutionary dynamics of somatic FAS variants in autoimmune lymphoproliferative syndrome: Diagnostic implications. Front Immunol 2022; 13:1014984. [PMID: 36466883 PMCID: PMC9716137 DOI: 10.3389/fimmu.2022.1014984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 10/24/2022] [Indexed: 11/21/2022] Open
Abstract
Autoimmune lymphoproliferative syndrome (ALPS) is a rare primary immune disorder characterized by impaired apoptotic homeostasis. The clinical characteristics include lymphoproliferation, autoimmunity (mainly cytopenia), and an increased risk of lymphoma. A distinctive biological feature is accumulation (>2.5%) of an abnormal cell subset composed of TCRαβ+ CD4-CD8- T cells (DNTs). The most common genetic causes of ALPS are monoallelic pathogenic variants in the FAS gene followed by somatic FAS variants, mainly restricted to DNTs. Identification of somatic FAS variants has been typically addressed by Sanger sequencing in isolated DNTs. However, this approach can be costly and technically challenging, and may not be successful in patients with normal DNT counts receiving immunosuppressive treatment. In this study, we identified a novel somatic mutation in FAS (c.718_719insGTCG) by Sanger sequencing on purified CD3+ cells. We then followed the evolutionary dynamics of the variant along time with an NGS-based approach involving deep amplicon sequencing (DAS) at high coverage (20,000-30,000x). Over five years of clinical follow-up, we obtained six blood samples for molecular study from the pre-treatment (DNTs>7%) and treatment (DNTs<2%) periods. DAS enabled detection of the somatic variant in all samples, even the one obtained after five years of immunosuppressive treatment (DNTs: 0.89%). The variant allele frequency (VAF) range was 4%-5% in pre-treatment samples and <1.5% in treatment samples, and there was a strong positive correlation between DNT counts and VAF (Pearson’s R: 0.98, p=0.0003). We then explored whether the same approach could be used in a discovery setting. In the last follow-up sample (DNT: 0.89%) we performed somatic variant calling on the FAS exon 9 DAS data from whole blood and purified CD3+ cells using VarScan 2. The c.718_719insGTCG variant was identified in both samples and showed the highest VAF (0.67% blood, 1.58% CD3+ cells) among >400 variants called. In summary, our study illustrates the evolutionary dynamics of a somatic FAS mutation before and during immunosuppressive treatment. The results show that pathogenic somatic FAS variants can be identified with the use of DAS in whole blood of ALPS patients regardless of their DNT counts.
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Affiliation(s)
- Laura Batlle-Masó
- Infection in Immunocompromised Pediatric Patients Research Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Pediatric Infectious Diseases and Immunodeficiencies Unit, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
| | - Marina Garcia-Prat
- Infection in Immunocompromised Pediatric Patients Research Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Pediatric Infectious Diseases and Immunodeficiencies Unit, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
| | - Alba Parra-Martínez
- Infection in Immunocompromised Pediatric Patients Research Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Pediatric Infectious Diseases and Immunodeficiencies Unit, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
| | - Clara Franco-Jarava
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
- Translational Immunology Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Immunology Division, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
| | - Aina Aguiló-Cucurull
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
- Translational Immunology Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Immunology Division, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
| | - Pablo Velasco
- Pediatric Oncology and Hematology Department, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
| | - María Antolín
- Department of Clinical and Molecular Genetics, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
| | - Jacques G. Rivière
- Infection in Immunocompromised Pediatric Patients Research Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Pediatric Infectious Diseases and Immunodeficiencies Unit, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
| | - Andrea Martín-Nalda
- Infection in Immunocompromised Pediatric Patients Research Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Pediatric Infectious Diseases and Immunodeficiencies Unit, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
| | - Pere Soler-Palacín
- Infection in Immunocompromised Pediatric Patients Research Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Pediatric Infectious Diseases and Immunodeficiencies Unit, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
| | - Mónica Martínez-Gallo
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
- Translational Immunology Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Immunology Division, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
- Department of Cell Biology, Autonomous University of Barcelona (UAB), Physiology and Immunology, Bellaterra, Spain
| | - Roger Colobran
- Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiencies, Barcelona, Spain
- Translational Immunology Group, Vall d’Hebron Research Institute (VHIR), Barcelona, Spain
- Immunology Division, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
- Department of Clinical and Molecular Genetics, Vall d’Hebron University Hospital (HUVH), Barcelona, Spain
- Department of Cell Biology, Autonomous University of Barcelona (UAB), Physiology and Immunology, Bellaterra, Spain
- *Correspondence: Roger Colobran,
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Wasilewska K, Gambin T, Rydzanicz M, Szczałuba K, Płoski R. Postzygotic mutations and where to find them - Recent advances and future implications in the field of non-neoplastic somatic mosaicism. MUTATION RESEARCH. REVIEWS IN MUTATION RESEARCH 2022; 790:108426. [PMID: 35690331 DOI: 10.1016/j.mrrev.2022.108426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 05/05/2022] [Accepted: 06/03/2022] [Indexed: 01/01/2023]
Abstract
The technological progress of massively parallel sequencing (MPS) has triggered a remarkable development in the research on postzygotic mutations. Although the overwhelming majority of studies in the field focus on oncogenesis, non-neoplastic diseases are attracting more and more attention. The aim of this review was to summarize some of the most recent findings in the field of somatic mosaicism in diseases other than neoplastic events. We discuss the abundance and role of postzygotic mutations, with a special emphasis on disorders which occur only in a mosaic form (obligatory mosaic diseases; OMDs). Based on the list of OMDs compiled from the published literature and three databases (OMIM, Orphanet and MosaicBase), we demonstrate the prevalence of cancer-related genes across OMDs and suggest other sources to further explore OMDs and OMD-related genes. Additionally, we comment on some practical aspects related to mosaic diseases, such as approaches to tissue sampling, the MPS coverage required to detect variants at a very low frequency, as well as on bioinformatic and molecular tools dedicated to detect somatic mutations in MPS data.
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Affiliation(s)
- Krystyna Wasilewska
- Department of Medical Genetics, Medical University of Warsaw, ul. Pawińskiego 3c, 02-106 Warsaw, Poland
| | - Tomasz Gambin
- Institute of Computer Science, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland
| | - Małgorzata Rydzanicz
- Department of Medical Genetics, Medical University of Warsaw, ul. Pawińskiego 3c, 02-106 Warsaw, Poland
| | - Krzysztof Szczałuba
- Department of Medical Genetics, Medical University of Warsaw, ul. Pawińskiego 3c, 02-106 Warsaw, Poland
| | - Rafał Płoski
- Department of Medical Genetics, Medical University of Warsaw, ul. Pawińskiego 3c, 02-106 Warsaw, Poland.
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Lobon I, Solís-Moruno M, Juan D, Muhaisen A, Abascal F, Esteller-Cucala P, García-Pérez R, Martí MJ, Tolosa E, Ávila J, Rahbari R, Marques-Bonet T, Casals F, Soriano E. Somatic Mutations Detected in Parkinson Disease Could Affect Genes With a Role in Synaptic and Neuronal Processes. FRONTIERS IN AGING 2022; 3:851039. [PMID: 35821807 PMCID: PMC9261316 DOI: 10.3389/fragi.2022.851039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Accepted: 03/16/2022] [Indexed: 12/17/2022]
Abstract
The role of somatic mutations in complex diseases, including neurodevelopmental and neurodegenerative disorders, is becoming increasingly clear. However, to date, no study has shown their relation to Parkinson disease’s phenotype. To explore the relevance of embryonic somatic mutations in sporadic Parkinson disease, we performed whole-exome sequencing in blood and four brain regions of ten patients. We identified 59 candidate somatic single nucleotide variants (sSNVs) through sensitive calling and a careful filtering strategy (COSMOS). We validated 27 of them with amplicon-based ultra-deep sequencing, with a 70% validation rate for the highest-confidence variants. The identified sSNVs are in genes with synaptic functions that are co-expressed with genes previously associated with Parkinson disease. Most of the sSNVs were only called in blood but were also found in the brain tissues with ultra-deep amplicon sequencing, demonstrating the strength of multi-tissue sampling designs.
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Affiliation(s)
- Irene Lobon
- Institute of Evolutionary Biology (UPF-CSIC), Barcelona, Spain
- *Correspondence: Irene Lobon, ; Eduardo Soriano,
| | - Manuel Solís-Moruno
- Institute of Evolutionary Biology (UPF-CSIC), Barcelona, Spain
- Genomics Core Facility, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain
| | - David Juan
- Institute of Evolutionary Biology (UPF-CSIC), Barcelona, Spain
| | - Ashraf Muhaisen
- Department of Cell Biology, Physiology and Immunology and Institute of Neurosciences, Universitat de Barcelona (UB), Barcelona, Spain
- Centre for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED), Madrid, Spain
| | - Federico Abascal
- Cancer, Ageing, and Somatic Mutation (CASM), Wellcome Sanger Institute, Cambridge, United Kingdom
| | | | | | - Maria Josep Martí
- Centre for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED), Madrid, Spain
- Department of Neurology, Hospital Clínic de Barcelona, Institut d’Investigacions Biomédiques August Pi i Sunyer (IDIBAPS), University of Barcelona (UB), Barcelona, Spain
| | - Eduardo Tolosa
- Centre for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED), Madrid, Spain
- Department of Neurology, Hospital Clínic de Barcelona, Institut d’Investigacions Biomédiques August Pi i Sunyer (IDIBAPS), University of Barcelona (UB), Barcelona, Spain
| | - Jesús Ávila
- Centre for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED), Madrid, Spain
- Centro de Biología Molecular Severo Ochoa, Madrid, Spain
| | - Raheleh Rahbari
- Cancer, Ageing, and Somatic Mutation (CASM), Wellcome Sanger Institute, Cambridge, United Kingdom
| | - Tomas Marques-Bonet
- Institute of Evolutionary Biology (UPF-CSIC), Barcelona, Spain
- Catalan Institution of Research and Advanced Studies (ICREA), Barcelona, Spain
- CNAG-CRG, Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), Barcelona, Spain
- Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Ferran Casals
- Genomics Core Facility, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
| | - Eduardo Soriano
- Department of Cell Biology, Physiology and Immunology and Institute of Neurosciences, Universitat de Barcelona (UB), Barcelona, Spain
- Centre for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED), Madrid, Spain
- *Correspondence: Irene Lobon, ; Eduardo Soriano,
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